Merge pull request #746 from damemi/update-go-version-121

[release-1.21] Bump Go to 1.16.14

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,46 @@
+---
+name: Bug report
+about: Create a bug report to help improve descheduler
+title: ''
+labels: 'kind/bug'
+assignees: ''
+
+---
+
+<!-- Please answer these questions before submitting your bug report. Thanks! -->
+
+**What version of descheduler are you using?**
+
+descheduler version:
+
+
+**Does this issue reproduce with the latest release?**
+
+
+**Which descheduler CLI options are you using?**
+
+
+**Please provide a copy of your descheduler policy config file**
+
+
+**What k8s version are you using (`kubectl version`)?**
+
+<details><summary><code>kubectl version</code> Output</summary><br><pre>
+$ kubectl version
+
+</pre></details>
+
+
+**What did you do?**
+
+<!--
+If possible, provide a recipe for reproducing the error.
+A detailed sequence of steps describing what to do to observe the issue is good.
+A complete runnable bash shell script is best.
+-->
+
+
+**What did you expect to see?**
+
+
+**What did you see instead?**

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,26 @@
+---
+name: Feature request
+about: Suggest an idea for descheduler
+title: ''
+labels: 'kind/feature'
+assignees: ''
+
+---
+
+<!-- Please answer these questions before submitting your feature request. Thanks! -->
+
+**Is your feature request related to a problem? Please describe.**
+<!-- A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] -->
+
+**Describe the solution you'd like**
+<!-- A clear and concise description of what you want to happen. -->
+
+**Describe alternatives you've considered**
+<!-- A clear and concise description of any alternative solutions or features you've considered. -->
+
+**What version of descheduler are you using?**
+
+descheduler version:
+
+**Additional context**
+<!-- Add any other context or screenshots about the feature request here. -->

.github/ISSUE_TEMPLATE/misc_request.md

@@ -0,0 +1,18 @@
+---
+name: Miscellaneous
+about: Not a bug and not a feature
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!--
+Please do not use this to submit a bug report or feature request. Use the
+bug report or feature request options instead.
+
+Also, please consider posting in the Kubernetes Slack #sig-scheduling channel
+instead of opening an issue if this is a support request.
+
+Thanks!
+-->

.github/workflows/release.yaml

@@ -0,0 +1,31 @@
+name: Release Charts
+
+on:
+  push:
+    branches:
+      - release-*
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Configure Git
+        run: |
+          git config user.name "$GITHUB_ACTOR"
+          git config user.email "$GITHUB_ACTOR@users.noreply.github.com"
+
+      - name: Install Helm
+        uses: azure/setup-helm@v1
+        with:
+          version: v3.4.0
+
+      - name: Run chart-releaser
+        uses: helm/chart-releaser-action@v1.1.0
+        env:
+          CR_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+          CR_RELEASE_NAME_TEMPLATE: "descheduler-helm-chart-{{ .Version }}"

.gitignore

@@ -3,3 +3,4 @@ _tmp/
 vendordiff.patch
 .idea/
 *.code-workspace
+.vscode/

.travis.yml

@@ -1,33 +0,0 @@
-sudo: false
-
-language: go
-
-go:
-  - 1.13.x
-env:
-  - K8S_VERSION=v1.18.2
-  - K8S_VERSION=v1.17.5
-  - K8S_VERSION=v1.16.9
-  - K8S_VERSION=v1.15.11
-services:
-  - docker
-before_script:
-  - curl -Lo kubectl https://storage.googleapis.com/kubernetes-release/release/${K8S_VERSION}/bin/linux/amd64/kubectl && chmod +x kubectl && sudo mv kubectl /usr/local/bin/
-  - wget https://github.com/kubernetes-sigs/kind/releases/download/v0.8.1/kind-linux-amd64
-  - chmod +x kind-linux-amd64
-  - mv kind-linux-amd64 kind
-  - export PATH=$PATH:$PWD
-  - kind create cluster --image kindest/node:${K8S_VERSION} --config=$TRAVIS_BUILD_DIR/hack/kind_config.yaml
-  - export KUBECONFIG="$(kind get kubeconfig-path)"
-  - docker pull kubernetes/pause
-  - kind load docker-image kubernetes/pause
-  - kind get kubeconfig > /tmp/admin.conf
-script:
-- mkdir -p ~/gopath/src/sigs.k8s.io/
-- mv ~/gopath/src/github.com/kubernetes-sigs/descheduler ~/gopath/src/sigs.k8s.io/.
-- hack/verify-gofmt.sh
-- hack/verify-vendor.sh
-- make lint
-- make build
-- make test-unit
-- make test-e2e

Dockerfile

@@ -11,15 +11,19 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-FROM golang:1.13.9
+FROM golang:1.16.14
 
 WORKDIR /go/src/sigs.k8s.io/descheduler
 COPY . .
-RUN make
+ARG ARCH
+ARG VERSION
+RUN VERSION=${VERSION} make build.$ARCH
 
 FROM scratch
 
-MAINTAINER Avesh Agarwal <avesh.ncsu@gmail.com>
+MAINTAINER Kubernetes SIG Scheduling <kubernetes-sig-scheduling@googlegroups.com>
+
+USER 1000
 
 COPY --from=0 /go/src/sigs.k8s.io/descheduler/_output/bin/descheduler /bin/descheduler
 

Dockerfile.dev

@@ -13,7 +13,9 @@
 # limitations under the License.
 FROM scratch
 
-MAINTAINER Avesh Agarwal <avesh.ncsu@gmail.com>
+MAINTAINER Kubernetes SIG Scheduling <kubernetes-sig-scheduling@googlegroups.com>
+
+USER 1000
 
 COPY _output/bin/descheduler /bin/descheduler
 

Makefile

@@ -14,16 +14,18 @@
 
 .PHONY: test
 
-# VERSION is currently based on the last commit
-VERSION?=$(shell git describe --tags)
-COMMIT=$(shell git rev-parse HEAD)
+# VERSION is based on a date stamp plus the last commit
+VERSION?=v$(shell date +%Y%m%d)-$(shell git describe --tags --match "v*")
+BRANCH?=$(shell git branch --show-current)
+SHA1?=$(shell git rev-parse HEAD)
 BUILD=$(shell date +%FT%T%z)
-LDFLAG_LOCATION=sigs.k8s.io/descheduler/cmd/descheduler/app
+LDFLAG_LOCATION=sigs.k8s.io/descheduler/pkg/version
+ARCHS = amd64 arm arm64
 
-LDFLAGS=-ldflags "-X ${LDFLAG_LOCATION}.version=${VERSION} -X ${LDFLAG_LOCATION}.buildDate=${BUILD} -X ${LDFLAG_LOCATION}.gitCommit=${COMMIT}"
+LDFLAGS=-ldflags "-X ${LDFLAG_LOCATION}.version=${VERSION} -X ${LDFLAG_LOCATION}.buildDate=${BUILD} -X ${LDFLAG_LOCATION}.gitbranch=${BRANCH} -X ${LDFLAG_LOCATION}.gitsha1=${SHA1}"
 
-GOLANGCI_VERSION := v1.15.0
-HAS_GOLANGCI := $(shell which golangci-lint)
+GOLANGCI_VERSION := v1.30.0
+HAS_GOLANGCI := $(shell ls _output/bin/golangci-lint)
 
 # REGISTRY is the container registry to push
 # into. The default is to push to the staging
@@ -41,26 +43,74 @@ IMAGE_GCLOUD:=$(REGISTRY)/descheduler:$(VERSION)
 # In the future binaries can be uploaded to
 # GCS bucket gs://k8s-staging-descheduler.
 
+HAS_HELM := $(shell which helm)
+
 all: build
 
 build:
 	CGO_ENABLED=0 go build ${LDFLAGS} -o _output/bin/descheduler sigs.k8s.io/descheduler/cmd/descheduler
 
+build.amd64:
+	CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build ${LDFLAGS} -o _output/bin/descheduler sigs.k8s.io/descheduler/cmd/descheduler
+
+build.arm:
+	CGO_ENABLED=0 GOOS=linux GOARCH=arm GOARM=7 go build ${LDFLAGS} -o _output/bin/descheduler sigs.k8s.io/descheduler/cmd/descheduler
+
+build.arm64:
+	CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build ${LDFLAGS} -o _output/bin/descheduler sigs.k8s.io/descheduler/cmd/descheduler
+
 dev-image: build
 	docker build -f Dockerfile.dev -t $(IMAGE) .
 
 image:
-	docker build -t $(IMAGE) .
+	docker build --build-arg VERSION="$(VERSION)" --build-arg ARCH="amd64" -t $(IMAGE) .
 
-push-container-to-gcloud: image
+image.amd64:
+	docker build --build-arg VERSION="$(VERSION)" --build-arg ARCH="amd64" -t $(IMAGE)-amd64 .
+
+image.arm:
+	docker build --build-arg VERSION="$(VERSION)" --build-arg ARCH="arm" -t $(IMAGE)-arm .
+
+image.arm64:
+	docker build --build-arg VERSION="$(VERSION)" --build-arg ARCH="arm64" -t $(IMAGE)-arm64 .
+
+push: image
 	gcloud auth configure-docker
 	docker tag $(IMAGE) $(IMAGE_GCLOUD)
 	docker push $(IMAGE_GCLOUD)
 
-push: push-container-to-gcloud
+push-all: image.amd64 image.arm image.arm64
+	gcloud auth configure-docker
+	for arch in $(ARCHS); do \
+		docker tag $(IMAGE)-$${arch} $(IMAGE_GCLOUD)-$${arch} ;\
+		docker push $(IMAGE_GCLOUD)-$${arch} ;\
+	done
+	DOCKER_CLI_EXPERIMENTAL=enabled docker manifest create $(IMAGE_GCLOUD) $(addprefix --amend $(IMAGE_GCLOUD)-, $(ARCHS))
+	for arch in $(ARCHS); do \
+		DOCKER_CLI_EXPERIMENTAL=enabled docker manifest annotate --arch $${arch} $(IMAGE_GCLOUD) $(IMAGE_GCLOUD)-$${arch} ;\
+	done
+	DOCKER_CLI_EXPERIMENTAL=enabled docker manifest push $(IMAGE_GCLOUD) ;\
 
 clean:
 	rm -rf _output
+	rm -rf _tmp
+
+verify: verify-govet verify-spelling verify-gofmt verify-vendor lint lint-chart verify-toc verify-gen
+
+verify-govet:
+	./hack/verify-govet.sh
+
+verify-spelling:
+	./hack/verify-spelling.sh
+
+verify-gofmt:
+	./hack/verify-gofmt.sh
+
+verify-vendor:
+	./hack/verify-vendor.sh
+
+verify-toc:
+	./hack/verify-toc.sh
 
 test-unit:
 	./test/run-unit-tests.sh
@@ -72,10 +122,23 @@ gen:
 	./hack/update-generated-conversions.sh
 	./hack/update-generated-deep-copies.sh
 	./hack/update-generated-defaulters.sh
-	#undo go mod changes caused by above.
-	go mod tidy
+	./hack/update-toc.sh
+
+verify-gen:
+	./hack/verify-conversions.sh
+	./hack/verify-deep-copies.sh
+
 lint:
 ifndef HAS_GOLANGCI
-	curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $(GOPATH)/bin ${GOLANGCI_VERSION}
+	curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b ./_output/bin ${GOLANGCI_VERSION}
 endif
-	golangci-lint run
+	./_output/bin/golangci-lint run
+
+lint-chart:
+ifndef HAS_HELM
+	curl -fsSL -o get_helm.sh https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3 && chmod 700 ./get_helm.sh && ./get_helm.sh
+endif
+	helm lint ./charts/descheduler
+
+test-helm:
+	./test/run-helm-tests.sh

OWNERS

@@ -1,11 +1,16 @@
 approvers:
-- aveshagarwal
-- k82cn
-- ravisantoshgudimetla
 - damemi
+- ingvagabund
+- seanmalloy
 reviewers:
 - aveshagarwal
 - k82cn
 - ravisantoshgudimetla
 - damemi
 - seanmalloy
+- ingvagabund
+- lixiang233
+emeritus_approvers:
+- aveshagarwal
+- k82cn
+- ravisantoshgudimetla

README.md

@@ -1,10 +1,8 @@
-[![Build Status](https://travis-ci.org/kubernetes-sigs/descheduler.svg?branch=master)](https://travis-ci.org/kubernetes-sigs/descheduler)
 [![Go Report Card](https://goreportcard.com/badge/kubernetes-sigs/descheduler)](https://goreportcard.com/report/sigs.k8s.io/descheduler)
+![Release Charts](https://github.com/kubernetes-sigs/descheduler/workflows/Release%20Charts/badge.svg)
 
 # Descheduler for Kubernetes
 
-## Introduction
-
 Scheduling in Kubernetes is the process of binding pending pods to nodes, and is performed by
 a component of Kubernetes called kube-scheduler. The scheduler's decisions, whether or where a
 pod can or can not be scheduled, are guided by its configurable policy which comprises of set of
@@ -24,9 +22,44 @@ Descheduler, based on its policy, finds pods that can be moved and evicts them.
 note, in current implementation, descheduler does not schedule replacement of evicted pods
 but relies on the default scheduler for that.
 
+Table of Contents
+=================
+<!-- toc -->
+- [Quick Start](#quick-start)
+  - [Run As A Job](#run-as-a-job)
+  - [Run As A CronJob](#run-as-a-cronjob)
+  - [Run As A Deployment](#run-as-a-deployment)
+  - [Install Using Helm](#install-using-helm)
+  - [Install Using Kustomize](#install-using-kustomize)
+- [User Guide](#user-guide)
+- [Policy and Strategies](#policy-and-strategies)
+  - [RemoveDuplicates](#removeduplicates)
+  - [LowNodeUtilization](#lownodeutilization)
+  - [HighNodeUtilization](#highnodeutilization)
+  - [RemovePodsViolatingInterPodAntiAffinity](#removepodsviolatinginterpodantiaffinity)
+  - [RemovePodsViolatingNodeAffinity](#removepodsviolatingnodeaffinity)
+  - [RemovePodsViolatingNodeTaints](#removepodsviolatingnodetaints)
+  - [RemovePodsViolatingTopologySpreadConstraint](#removepodsviolatingtopologyspreadconstraint)
+  - [RemovePodsHavingTooManyRestarts](#removepodshavingtoomanyrestarts)
+  - [PodLifeTime](#podlifetime)
+- [Filter Pods](#filter-pods)
+  - [Namespace filtering](#namespace-filtering)
+  - [Priority filtering](#priority-filtering)
+  - [Label filtering](#label-filtering)
+  - [Node Fit filtering](#node-fit-filtering)
+- [Pod Evictions](#pod-evictions)
+  - [Pod Disruption Budget (PDB)](#pod-disruption-budget-pdb)
+- [Metrics](#metrics)
+- [Compatibility Matrix](#compatibility-matrix)
+- [Getting Involved and Contributing](#getting-involved-and-contributing)
+  - [Communicating With Contributors](#communicating-with-contributors)
+- [Roadmap](#roadmap)
+  - [Code of conduct](#code-of-conduct)
+<!-- /toc -->
+
 ## Quick Start
 
-The descheduler can be run as a Job or CronJob inside of a k8s cluster. It has the
+The descheduler can be run as a `Job`, `CronJob`, or `Deployment` inside of a k8s cluster. It has the
 advantage of being able to be run multiple times without needing user intervention.
 The descheduler pod is run as a critical pod in the `kube-system` namespace to avoid
 being evicted by itself or by the kubelet.
@@ -34,17 +67,52 @@ being evicted by itself or by the kubelet.
 ### Run As A Job
 
 ```
-kubectl create -f kubernetes/rbac.yaml
-kubectl create -f kubernetes/configmap.yaml
-kubectl create -f kubernetes/job.yaml
+kubectl create -f kubernetes/base/rbac.yaml
+kubectl create -f kubernetes/base/configmap.yaml
+kubectl create -f kubernetes/job/job.yaml
 ```
 
 ### Run As A CronJob
 
 ```
-kubectl create -f kubernetes/rbac.yaml
-kubectl create -f kubernetes/configmap.yaml
-kubectl create -f kubernetes/cronjob.yaml
+kubectl create -f kubernetes/base/rbac.yaml
+kubectl create -f kubernetes/base/configmap.yaml
+kubectl create -f kubernetes/cronjob/cronjob.yaml
+```
+
+### Run As A Deployment
+
+```
+kubectl create -f kubernetes/base/rbac.yaml
+kubectl create -f kubernetes/base/configmap.yaml
+kubectl create -f kubernetes/deployment/deployment.yaml
+```
+
+### Install Using Helm
+
+Starting with release v0.18.0 there is an official helm chart that can be used to install the
+descheduler. See the [helm chart README](https://github.com/kubernetes-sigs/descheduler/blob/master/charts/descheduler/README.md) for detailed instructions.
+
+The descheduler helm chart is also listed on the [artifact hub](https://artifacthub.io/packages/helm/descheduler/descheduler).
+
+### Install Using Kustomize
+
+You can use kustomize to install descheduler.
+See the [resources | Kustomize](https://kubectl.docs.kubernetes.io/references/kustomize/resource/) for detailed instructions.
+
+Run As A Job
+```
+kustomize build 'github.com/kubernetes-sigs/descheduler/kubernetes/job?ref=v0.21.0' | kubectl apply -f -
+```
+
+Run As A CronJob
+```
+kustomize build 'github.com/kubernetes-sigs/descheduler/kubernetes/cronjob?ref=v0.21.0' | kubectl apply -f -
+```
+
+Run As A Deployment
+```
+kustomize build 'github.com/kubernetes-sigs/descheduler/kubernetes/deployment?ref=v0.21.0' | kubectl apply -f -
 ```
 
 ## User Guide
@@ -54,24 +122,69 @@ See the [user guide](docs/user-guide.md) in the `/docs` directory.
 ## Policy and Strategies
 
 Descheduler's policy is configurable and includes strategies that can be enabled or disabled.
-Seven strategies `RemoveDuplicates`, `LowNodeUtilization`, `RemovePodsViolatingInterPodAntiAffinity`,
-`RemovePodsViolatingNodeAffinity`, `RemovePodsViolatingNodeTaints`, `RemovePodsHavingTooManyRestarts`, and `PodLifeTime`
-are currently implemented. As part of the policy, the parameters associated with the strategies can be configured too.
-By default, all strategies are enabled.
+Nine strategies
+1. `RemoveDuplicates`
+2. `LowNodeUtilization`
+3. `HighNodeUtilization`
+4. `RemovePodsViolatingInterPodAntiAffinity`
+5. `RemovePodsViolatingNodeAffinity`
+6. `RemovePodsViolatingNodeTaints`
+7. `RemovePodsViolatingTopologySpreadConstraint`
+8. `RemovePodsHavingTooManyRestarts`
+9. `PodLifeTime`  
+are currently implemented. As part of the policy, the
+parameters associated with the strategies can be configured too. By default, all strategies are enabled.
+
+The following diagram provides a visualization of most of the strategies to help
+categorize how strategies fit together.
+
+![Strategies diagram](strategies_diagram.png)
+
+The policy also includes common configuration for all the strategies:
+- `nodeSelector` - limiting the nodes which are processed
+- `evictLocalStoragePods` - allows eviction of pods with local storage
+- `evictSystemCriticalPods` - [Warning: Will evict Kubernetes system pods] allows eviction of pods with any priority, including system pods like kube-dns
+- `ignorePvcPods` - set whether PVC pods should be evicted or ignored (defaults to `false`)
+- `maxNoOfPodsToEvictPerNode` - maximum number of pods evicted from each node (summed through all strategies)
+
+```yaml
+apiVersion: "descheduler/v1alpha1"
+kind: "DeschedulerPolicy"
+nodeSelector: prod=dev
+evictLocalStoragePods: true
+evictSystemCriticalPods: true
+maxNoOfPodsToEvictPerNode: 40
+ignorePvcPods: false
+strategies:
+  ...
+```
 
 ### RemoveDuplicates
 
-This strategy makes sure that there is only one pod associated with a Replica Set (RS),
-Replication Controller (RC), Deployment, or Job running on the same node. If there are more,
+This strategy makes sure that there is only one pod associated with a ReplicaSet (RS),
+ReplicationController (RC), StatefulSet, or Job running on the same node. If there are more,
 those duplicate pods are evicted for better spreading of pods in a cluster. This issue could happen
 if some nodes went down due to whatever reasons, and pods on them were moved to other nodes leading to
 more than one pod associated with a RS or RC, for example, running on the same node. Once the failed nodes
 are ready again, this strategy could be enabled to evict those duplicate pods.
 
-It provides one optional parameter, `ExcludeOwnerKinds`, which is a list of OwnerRef `Kind`s. If a pod
-has any of these `Kind`s listed as an `OwnerRef`, that pod will not be considered for eviction.
+It provides one optional parameter, `excludeOwnerKinds`, which is a list of OwnerRef `Kind`s. If a pod
+has any of these `Kind`s listed as an `OwnerRef`, that pod will not be considered for eviction. Note that
+pods created by Deployments are considered for eviction by this strategy. The `excludeOwnerKinds` parameter
+should include `ReplicaSet` to have pods created by Deployments excluded.
 
-```
+**Parameters:**
+
+|Name|Type|
+|---|---|
+|`excludeOwnerKinds`|list(string)|
+|`namespaces`|(see [namespace filtering](#namespace-filtering))|
+|`thresholdPriority`|int (see [priority filtering](#priority-filtering))|
+|`thresholdPriorityClassName`|string (see [priority filtering](#priority-filtering))|
+|`nodeFit`|bool (see [node fit filtering](#node-fit-filtering))|
+
+**Example:**
+```yaml
 apiVersion: "descheduler/v1alpha1"
 kind: "DeschedulerPolicy"
 strategies:
@@ -90,19 +203,37 @@ in the hope that recreation of evicted pods will be scheduled on these underutil
 parameters of this strategy are configured under `nodeResourceUtilizationThresholds`.
 
 The under utilization of nodes is determined by a configurable threshold `thresholds`. The threshold
-`thresholds` can be configured for cpu, memory, and number of pods in terms of percentage. If a node's
-usage is below threshold for all (cpu, memory, and number of pods), the node is considered underutilized.
+`thresholds` can be configured for cpu, memory, number of pods, and extended resources in terms of percentage (the percentage is
+calculated as the current resources requested on the node vs [total allocatable](https://kubernetes.io/docs/concepts/architecture/nodes/#capacity).
+For pods, this means the number of pods on the node as a fraction of the pod capacity set for that node).
+
+If a node's usage is below threshold for all (cpu, memory, number of pods and extended resources), the node is considered underutilized.
 Currently, pods request resource requirements are considered for computing node resource utilization.
 
 There is another configurable threshold, `targetThresholds`, that is used to compute those potential nodes
-from where pods could be evicted. Any node, between the thresholds, `thresholds` and `targetThresholds` is
+from where pods could be evicted. If a node's usage is above targetThreshold for any (cpu, memory, number of pods, or extended resources),
+the node is considered over utilized. Any node between the thresholds, `thresholds` and `targetThresholds` is
 considered appropriately utilized and is not considered for eviction. The threshold, `targetThresholds`,
 can be configured for cpu, memory, and number of pods too in terms of percentage.
 
-These thresholds, `thresholds` and `targetThresholds`, could be tuned as per your cluster requirements.
-Here is an example of a policy for this strategy:
+These thresholds, `thresholds` and `targetThresholds`, could be tuned as per your cluster requirements. Note that this
+strategy evicts pods from `overutilized nodes` (those with usage above `targetThresholds`) to `underutilized nodes`
+(those with usage below `thresholds`), it will abort if any number of `underutilized nodes` or `overutilized nodes` is zero.
 
-```
+**Parameters:**
+
+|Name|Type|
+|---|---|
+|`thresholds`|map(string:int)|
+|`targetThresholds`|map(string:int)|
+|`numberOfNodes`|int|
+|`thresholdPriority`|int (see [priority filtering](#priority-filtering))|
+|`thresholdPriorityClassName`|string (see [priority filtering](#priority-filtering))|
+|`nodeFit`|bool (see [node fit filtering](#node-fit-filtering))|
+
+**Example:**
+
+```yaml
 apiVersion: "descheduler/v1alpha1"
 kind: "DeschedulerPolicy"
 strategies:
@@ -120,26 +251,103 @@ strategies:
            "pods": 50
 ```
 
+Policy should pass the following validation checks:
+* Three basic native types of resources are supported: `cpu`, `memory` and `pods`.
+If any of these resource types is not specified, all its thresholds default to 100% to avoid nodes going from underutilized to overutilized.
+* Extended resources are supported. For example, resource type `nvidia.com/gpu` is specified for GPU node utilization. Extended resources are optional,
+and will not be used to compute node's usage if it's not specified in `thresholds` and `targetThresholds` explicitly.
+* `thresholds` or `targetThresholds` can not be nil and they must configure exactly the same types of resources.
+* The valid range of the resource's percentage value is \[0, 100\]
+* Percentage value of `thresholds` can not be greater than `targetThresholds` for the same resource.
+
 There is another parameter associated with the `LowNodeUtilization` strategy, called `numberOfNodes`.
 This parameter can be configured to activate the strategy only when the number of under utilized nodes
 are above the configured value. This could be helpful in large clusters where a few nodes could go
 under utilized frequently or for a short period of time. By default, `numberOfNodes` is set to zero.
 
+### HighNodeUtilization
+
+This strategy finds nodes that are under utilized and evicts pods in the hope that these pods will be scheduled compactly into fewer nodes.
+This strategy **must** be used with the
+scheduler strategy `MostRequestedPriority`. The parameters of this strategy are configured under `nodeResourceUtilizationThresholds`.
+
+The under utilization of nodes is determined by a configurable threshold `thresholds`. The threshold
+`thresholds` can be configured for cpu, memory, number of pods, and extended resources in terms of percentage. The percentage is
+calculated as the current resources requested on the node vs [total allocatable](https://kubernetes.io/docs/concepts/architecture/nodes/#capacity).
+For pods, this means the number of pods on the node as a fraction of the pod capacity set for that node.
+
+If a node's usage is below threshold for all (cpu, memory, number of pods and extended resources), the node is considered underutilized.
+Currently, pods request resource requirements are considered for computing node resource utilization.
+Any node above `thresholds` is considered appropriately utilized and is not considered for eviction.
+
+The `thresholds` param could be tuned as per your cluster requirements. Note that this
+strategy evicts pods from `underutilized nodes` (those with usage below `thresholds`)
+so that they can be recreated in appropriately utilized nodes.
+The strategy will abort if any number of `underutilized nodes` or `appropriately utilized nodes` is zero.
+
+**Parameters:**
+
+|Name|Type|
+|---|---|
+|`thresholds`|map(string:int)|
+|`numberOfNodes`|int|
+|`thresholdPriority`|int (see [priority filtering](#priority-filtering))|
+|`thresholdPriorityClassName`|string (see [priority filtering](#priority-filtering))|
+|`nodeFit`|bool (see [node fit filtering](#node-fit-filtering))|
+
+**Example:**
+
+```yaml
+apiVersion: "descheduler/v1alpha1"
+kind: "DeschedulerPolicy"
+strategies:
+  "HighNodeUtilization":
+     enabled: true
+     params:
+       nodeResourceUtilizationThresholds:
+         thresholds:
+           "cpu" : 20
+           "memory": 20
+           "pods": 20
+```
+
+Policy should pass the following validation checks:
+* Three basic native types of resources are supported: `cpu`, `memory` and `pods`. If any of these resource types is not specified, all its thresholds default to 100%.
+* Extended resources are supported. For example, resource type `nvidia.com/gpu` is specified for GPU node utilization. Extended resources are optional, and will not be used to compute node's usage if it's not specified in `thresholds` explicitly.
+* `thresholds` can not be nil.
+* The valid range of the resource's percentage value is \[0, 100\]
+
+There is another parameter associated with the `HighNodeUtilization` strategy, called `numberOfNodes`.
+This parameter can be configured to activate the strategy only when the number of under utilized nodes
+is above the configured value. This could be helpful in large clusters where a few nodes could go
+under utilized frequently or for a short period of time. By default, `numberOfNodes` is set to zero.
+
 ### RemovePodsViolatingInterPodAntiAffinity
 
 This strategy makes sure that pods violating interpod anti-affinity are removed from nodes. For example,
 if there is podA on a node and podB and podC (running on the same node) have anti-affinity rules which prohibit
 them to run on the same node, then podA will be evicted from the node so that podB and podC could run. This
 issue could happen, when the anti-affinity rules for podB and podC are created when they are already running on
-node. Currently, there are no parameters associated with this strategy. To disable this strategy, the
-policy should look like:
+node.
 
-```
+**Parameters:**
+
+|Name|Type|
+|---|---|
+|`thresholdPriority`|int (see [priority filtering](#priority-filtering))|
+|`thresholdPriorityClassName`|string (see [priority filtering](#priority-filtering))|
+|`namespaces`|(see [namespace filtering](#namespace-filtering))|
+|`labelSelector`|(see [label filtering](#label-filtering))|
+|`nodeFit`|bool (see [node fit filtering](#node-fit-filtering))|
+
+**Example:**
+
+```yaml
 apiVersion: "descheduler/v1alpha1"
 kind: "DeschedulerPolicy"
 strategies:
   "RemovePodsViolatingInterPodAntiAffinity":
-     enabled: false
+     enabled: true
 ```
 
 ### RemovePodsViolatingNodeAffinity
@@ -160,9 +368,20 @@ of scheduling. Over time nodeA stops to satisfy the rule. When the strategy gets
 executed and there is another node available that satisfies the node affinity rule,
 podA gets evicted from nodeA.
 
-The policy file should look like:
+**Parameters:**
 
-```
+|Name|Type|
+|---|---|
+|`nodeAffinityType`|list(string)|
+|`thresholdPriority`|int (see [priority filtering](#priority-filtering))|
+|`thresholdPriorityClassName`|string (see [priority filtering](#priority-filtering))|
+|`namespaces`|(see [namespace filtering](#namespace-filtering))|
+|`labelSelector`|(see [label filtering](#label-filtering))|
+|`nodeFit`|bool (see [node fit filtering](#node-fit-filtering))|
+
+**Example:**
+
+```yaml
 apiVersion: "descheduler/v1alpha1"
 kind: "DeschedulerPolicy"
 strategies:
@@ -178,9 +397,21 @@ strategies:
 This strategy makes sure that pods violating NoSchedule taints on nodes are removed. For example there is a
 pod "podA" with a toleration to tolerate a taint ``key=value:NoSchedule`` scheduled and running on the tainted
 node. If the node's taint is subsequently updated/removed, taint is no longer satisfied by its pods' tolerations
-and will be evicted. The policy file should look like:
+and will be evicted.
 
-````
+**Parameters:**
+
+|Name|Type|
+|---|---|
+|`thresholdPriority`|int (see [priority filtering](#priority-filtering))|
+|`thresholdPriorityClassName`|string (see [priority filtering](#priority-filtering))|
+|`namespaces`|(see [namespace filtering](#namespace-filtering))|
+|`labelSelector`|(see [label filtering](#label-filtering))|
+|`nodeFit`|bool (see [node fit filtering](#node-fit-filtering))|
+
+**Example:**
+
+````yaml
 apiVersion: "descheduler/v1alpha1"
 kind: "DeschedulerPolicy"
 strategies:
@@ -188,11 +419,63 @@ strategies:
     enabled: true
 ````
 
+### RemovePodsViolatingTopologySpreadConstraint
+
+This strategy makes sure that pods violating [topology spread constraints](https://kubernetes.io/docs/concepts/workloads/pods/pod-topology-spread-constraints/)
+are evicted from nodes. Specifically, it tries to evict the minimum number of pods required to balance topology domains to within each constraint's `maxSkew`.
+This strategy requires k8s version 1.18 at a minimum.
+
+By default, this strategy only deals with hard constraints, setting parameter `includeSoftConstraints` to `true` will
+include soft constraints.
+
+Strategy parameter `labelSelector` is not utilized when balancing topology domains and is only applied during eviction to determine if the pod can be evicted.
+
+**Parameters:**
+
+|Name|Type|
+|---|---|
+|`includeSoftConstraints`|bool|
+|`thresholdPriority`|int (see [priority filtering](#priority-filtering))|
+|`thresholdPriorityClassName`|string (see [priority filtering](#priority-filtering))|
+|`namespaces`|(see [namespace filtering](#namespace-filtering))|
+|`labelSelector`|(see [label filtering](#label-filtering))|
+|`nodeFit`|bool (see [node fit filtering](#node-fit-filtering))|
+
+**Example:**
+
+```yaml
+apiVersion: "descheduler/v1alpha1"
+kind: "DeschedulerPolicy"
+strategies:
+  "RemovePodsViolatingTopologySpreadConstraint":
+     enabled: true
+     params:
+       includeSoftConstraints: false
+```
+
+
 ### RemovePodsHavingTooManyRestarts
 
-This strategy makes sure that pods having too many restarts are removed from nodes. For example a pod with EBS/PD that can't get the volume/disk attached to the instance, then the pod should be re-scheduled to other nodes.
+This strategy makes sure that pods having too many restarts are removed from nodes. For example a pod with EBS/PD that
+can't get the volume/disk attached to the instance, then the pod should be re-scheduled to other nodes. Its parameters
+include `podRestartThreshold`, which is the number of restarts at which a pod should be evicted, and `includingInitContainers`,
+which determines whether init container restarts should be factored into that calculation.
+|`labelSelector`|(see [label filtering](#label-filtering))|
 
-```
+**Parameters:**
+
+|Name|Type|
+|---|---|
+|`podRestartThreshold`|int|
+|`includingInitContainers`|bool|
+|`thresholdPriority`|int (see [priority filtering](#priority-filtering))|
+|`thresholdPriorityClassName`|string (see [priority filtering](#priority-filtering))|
+|`namespaces`|(see [namespace filtering](#namespace-filtering))|
+|`nodeFit`|bool (see [node fit filtering](#node-fit-filtering))|
+
+**Example:**
+
+```yaml
 apiVersion: "descheduler/v1alpha1"
 kind: "DeschedulerPolicy"
 strategies:
@@ -206,42 +489,257 @@ strategies:
 
 ### PodLifeTime
 
-This strategy evicts pods that are older than `.strategies.PodLifeTime.params.maxPodLifeTimeSeconds` The policy
-file should look like:
+This strategy evicts pods that are older than `maxPodLifeTimeSeconds`.
 
-````
+You can also specify `podStatusPhases` to `only` evict pods with specific `StatusPhases`, currently this parameter is limited
+to `Running` and `Pending`.
+
+**Parameters:**
+
+|Name|Type|
+|---|---|
+|`maxPodLifeTimeSeconds`|int|
+|`podStatusPhases`|list(string)|
+|`thresholdPriority`|int (see [priority filtering](#priority-filtering))|
+|`thresholdPriorityClassName`|string (see [priority filtering](#priority-filtering))|
+|`namespaces`|(see [namespace filtering](#namespace-filtering))|
+|`labelSelector`|(see [label filtering](#label-filtering))|
+
+**Example:**
+
+```yaml
 apiVersion: "descheduler/v1alpha1"
 kind: "DeschedulerPolicy"
 strategies:
   "PodLifeTime":
      enabled: true
      params:
+       podLifeTime:
+         maxPodLifeTimeSeconds: 86400
+         podStatusPhases:
+         - "Pending"
+```
+
+## Filter Pods
+
+### Namespace filtering
+
+The following strategies accept a `namespaces` parameter which allows to specify a list of including, resp. excluding namespaces:
+* `PodLifeTime`
+* `RemovePodsHavingTooManyRestarts`
+* `RemovePodsViolatingNodeTaints`
+* `RemovePodsViolatingNodeAffinity`
+* `RemovePodsViolatingInterPodAntiAffinity`
+* `RemoveDuplicates`
+* `RemovePodsViolatingTopologySpreadConstraint`
+
+For example:
+
+```yaml
+apiVersion: "descheduler/v1alpha1"
+kind: "DeschedulerPolicy"
+strategies:
+  "PodLifeTime":
+     enabled: true
+     params:
+        podLifeTime:
+          maxPodLifeTimeSeconds: 86400
+        namespaces:
+          include:
+          - "namespace1"
+          - "namespace2"
+```
+
+In the examples `PodLifeTime` gets executed only over `namespace1` and `namespace2`.
+The similar holds for `exclude` field:
+
+```yaml
+apiVersion: "descheduler/v1alpha1"
+kind: "DeschedulerPolicy"
+strategies:
+  "PodLifeTime":
+     enabled: true
+     params:
+        podLifeTime:
+          maxPodLifeTimeSeconds: 86400
+        namespaces:
+          exclude:
+          - "namespace1"
+          - "namespace2"
+```
+
+The strategy gets executed over all namespaces but `namespace1` and `namespace2`.
+
+It's not allowed to compute `include` with `exclude` field.
+
+### Priority filtering
+
+All strategies are able to configure a priority threshold, only pods under the threshold can be evicted. You can
+specify this threshold by setting `thresholdPriorityClassName`(setting the threshold to the value of the given
+priority class) or `thresholdPriority`(directly setting the threshold) parameters. By default, this threshold
+is set to the value of `system-cluster-critical` priority class.
+
+Note: Setting `evictSystemCriticalPods` to true disables priority filtering entirely.
+
+E.g.
+
+Setting `thresholdPriority`
+```yaml
+apiVersion: "descheduler/v1alpha1"
+kind: "DeschedulerPolicy"
+strategies:
+  "PodLifeTime":
+     enabled: true
+     params:
+        podLifeTime:
+          maxPodLifeTimeSeconds: 86400
+        thresholdPriority: 10000
+```
+
+Setting `thresholdPriorityClassName`
+```yaml
+apiVersion: "descheduler/v1alpha1"
+kind: "DeschedulerPolicy"
+strategies:
+  "PodLifeTime":
+     enabled: true
+     params:
+        podLifeTime:
+          maxPodLifeTimeSeconds: 86400
+        thresholdPriorityClassName: "priorityclass1"
+```
+
+Note that you can't configure both `thresholdPriority` and `thresholdPriorityClassName`, if the given priority class
+does not exist, descheduler won't create it and will throw an error.
+
+### Label filtering
+
+The following strategies can configure a [standard kubernetes labelSelector](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.21/#labelselector-v1-meta)
+to filter pods by their labels:
+
+* `PodLifeTime`
+* `RemovePodsHavingTooManyRestarts`
+* `RemovePodsViolatingNodeTaints`
+* `RemovePodsViolatingNodeAffinity`
+* `RemovePodsViolatingInterPodAntiAffinity`
+* `RemovePodsViolatingTopologySpreadConstraint`
+
+This allows running strategies among pods the descheduler is interested in.
+
+For example:
+
+```yaml
+apiVersion: "descheduler/v1alpha1"
+kind: "DeschedulerPolicy"
+strategies:
+  "PodLifeTime":
+    enabled: true
+    params:
+      podLifeTime:
         maxPodLifeTimeSeconds: 86400
-````
+      labelSelector:
+        matchLabels:
+          component: redis
+        matchExpressions:
+          - {key: tier, operator: In, values: [cache]}
+          - {key: environment, operator: NotIn, values: [dev]}
+```
+
+
+### Node Fit filtering
+
+The following strategies accept a `nodeFit` boolean parameter which can optimize descheduling:
+* `RemoveDuplicates`
+* `LowNodeUtilization`
+* `HighNodeUtilization`
+* `RemovePodsViolatingInterPodAntiAffinity`
+* `RemovePodsViolatingNodeAffinity`
+* `RemovePodsViolatingNodeTaints`
+* `RemovePodsViolatingTopologySpreadConstraint`
+* `RemovePodsHavingTooManyRestarts`
+
+ If set to `true` the descheduler will consider whether or not the pods that meet eviction criteria will fit on other nodes before evicting them. If a pod cannot be rescheduled to another node, it will not be evicted. Currently the following criteria are considered when setting `nodeFit` to `true`:
+- A `nodeSelector` on the pod
+- Any `Tolerations` on the pod and any `Taints` on the other nodes
+- `nodeAffinity` on the pod
+- Whether any of the other nodes are marked as `unschedulable`
+
+E.g.
+
+```yaml
+apiVersion: "descheduler/v1alpha1"
+kind: "DeschedulerPolicy"
+strategies:
+  "LowNodeUtilization":
+     enabled: true
+     params:
+       nodeResourceUtilizationThresholds:
+         thresholds:
+           "cpu" : 20
+           "memory": 20
+           "pods": 20
+         targetThresholds:
+           "cpu" : 50
+           "memory": 50
+           "pods": 50
+        nodeFit: true
+```
+
+Note that node fit filtering references the current pod spec, and not that of it's owner.
+Thus, if the pod is owned by a ReplicationController (and that ReplicationController was modified recently),
+the pod may be running with an outdated spec, which the descheduler will reference when determining node fit.
+This is expected behavior as the descheduler is a "best-effort" mechanism.
+
+Using Deployments instead of ReplicationControllers provides an automated rollout of pod spec changes, therefore ensuring that the descheduler has an up-to-date view of the cluster state.
 
 ## Pod Evictions
 
 When the descheduler decides to evict pods from a node, it employs the following general mechanism:
 
-* [Critical pods](https://kubernetes.io/docs/tasks/administer-cluster/guaranteed-scheduling-critical-addon-pods/) (with priorityClassName set to system-cluster-critical or system-node-critical) are never evicted.
-* Pods (static or mirrored pods or stand alone pods) not part of an RC, RS, Deployment or Job are
+* [Critical pods](https://kubernetes.io/docs/tasks/administer-cluster/guaranteed-scheduling-critical-addon-pods/) (with priorityClassName set to system-cluster-critical or system-node-critical) are never evicted (unless `evictSystemCriticalPods: true` is set).
+* Pods (static or mirrored pods or stand alone pods) not part of an ReplicationController, ReplicaSet(Deployment), StatefulSet, or Job are
 never evicted because these pods won't be recreated.
 * Pods associated with DaemonSets are never evicted.
-* Pods with local storage are never evicted.
-* Best efforts pods are evicted before burstable and guaranteed pods.
-* All types of pods with the annotation descheduler.alpha.kubernetes.io/evict are evicted. This
+* Pods with local storage are never evicted (unless `evictLocalStoragePods: true` is set).
+* Pods with PVCs are evicted (unless `ignorePvcPods: true` is set).
+* In `LowNodeUtilization` and `RemovePodsViolatingInterPodAntiAffinity`, pods are evicted by their priority from low to high, and if they have same priority,
+best effort pods are evicted before burstable and guaranteed pods.
+* All types of pods with the annotation `descheduler.alpha.kubernetes.io/evict` are eligible for eviction. This
   annotation is used to override checks which prevent eviction and users can select which pod is evicted.
   Users should know how and if the pod will be recreated.
 
+Setting `--v=4` or greater on the Descheduler will log all reasons why any pod is not evictable.
+
 ### Pod Disruption Budget (PDB)
 
 Pods subject to a Pod Disruption Budget(PDB) are not evicted if descheduling violates its PDB. The pods
 are evicted by using the eviction subresource to handle PDB.
 
-## Compatibility Matrix
+## Metrics
 
-Descheduler  | supported Kubernetes version
+| name	| type	| description |
+|-------|-------|----------------|
+| build_info |	gauge |	constant 1 |
+| pods_evicted | CounterVec | total number of pods evicted |
+
+The metrics are served through https://localhost:10258/metrics by default.
+The address and port can be changed by setting `--binding-address` and `--secure-port` flags.
+
+## Compatibility Matrix
+The below compatibility matrix shows the k8s client package(client-go, apimachinery, etc) versions that descheduler
+is compiled with. At this time descheduler does not have a hard dependency to a specific k8s release. However a
+particular descheduler release is only tested against the three latest k8s minor versions. For example descheduler
+v0.18 should work with k8s v1.18, v1.17, and v1.16.
+
+Starting with descheduler release v0.18 the minor version of descheduler matches the minor version of the k8s client
+packages that it is compiled with.
+
+Descheduler  | Supported Kubernetes Version
 -------------|-----------------------------
+v0.21        | v1.21
+v0.20        | v1.20
+v0.19        | v1.19
+v0.18        | v1.18
 v0.10        | v1.17
 v0.4-v0.9    | v1.9+
 v0.1-v0.3    | v1.7-v1.8

charts/descheduler/.helmignore

@@ -0,0 +1,22 @@
+# Patterns to ignore when building packages.
+# This supports shell glob matching, relative path matching, and
+# negation (prefixed with !). Only one pattern per line.
+.DS_Store
+# Common VCS dirs
+.git/
+.gitignore
+.bzr/
+.bzrignore
+.hg/
+.hgignore
+.svn/
+# Common backup files
+*.swp
+*.bak
+*.tmp
+*~
+# Various IDEs
+.project
+.idea/
+*.tmproj
+.vscode/

charts/descheduler/Chart.yaml

@@ -0,0 +1,16 @@
+apiVersion: v1
+name: descheduler
+version: 0.21.0
+appVersion: 0.21.0
+description: Descheduler for Kubernetes is used to rebalance clusters by evicting pods that can potentially be scheduled on better nodes. In the current implementation, descheduler does not schedule replacement of evicted pods but relies on the default scheduler for that.
+keywords:
+- kubernetes
+- descheduler
+- kube-scheduler
+home: https://github.com/kubernetes-sigs/descheduler
+icon: https://kubernetes.io/images/favicon.png
+sources:
+- https://github.com/kubernetes-sigs/descheduler
+maintainers:
+- name: Kubernetes SIG Scheduling
+  email: kubernetes-sig-scheduling@googlegroups.com

charts/descheduler/README.md

@@ -0,0 +1,66 @@
+# Descheduler for Kubernetes
+
+[Descheduler](https://github.com/kubernetes-sigs/descheduler/) for Kubernetes is used to rebalance clusters by evicting pods that can potentially be scheduled on better nodes. In the current implementation, descheduler does not schedule replacement of evicted pods but relies on the default scheduler for that.
+
+## TL;DR:
+
+```shell
+helm repo add descheduler https://kubernetes-sigs.github.io/descheduler/
+helm install my-release --namespace kube-system descheduler/descheduler
+```
+
+## Introduction
+
+This chart bootstraps a [descheduler](https://github.com/kubernetes-sigs/descheduler/) cron job on a [Kubernetes](http://kubernetes.io) cluster using the [Helm](https://helm.sh) package manager.
+
+## Prerequisites
+
+- Kubernetes 1.14+
+
+## Installing the Chart
+
+To install the chart with the release name `my-release`:
+
+```shell
+helm install --namespace kube-system my-release descheduler/descheduler
+```
+
+The command deploys _descheduler_ on the Kubernetes cluster in the default configuration. The [configuration](#configuration) section lists the parameters that can be configured during installation.
+
+> **Tip**: List all releases using `helm list`
+
+## Uninstalling the Chart
+
+To uninstall/delete the `my-release` deployment:
+
+```shell
+helm delete my-release
+```
+
+The command removes all the Kubernetes components associated with the chart and deletes the release.
+
+## Configuration
+
+The following table lists the configurable parameters of the _descheduler_ chart and their default values.
+
+| Parameter                      | Description                                                                                                           | Default                              |
+| ------------------------------ | --------------------------------------------------------------------------------------------------------------------- | ------------------------------------ |
+| `image.repository`             | Docker repository to use                                                                                              | `k8s.gcr.io/descheduler/descheduler` |
+| `image.tag`                    | Docker tag to use                                                                                                     | `v[chart appVersion]`                |
+| `image.pullPolicy`             | Docker image pull policy                                                                                              | `IfNotPresent`                       |
+| `nameOverride`                 | String to partially override `descheduler.fullname` template (will prepend the release name)                          | `""`                                 |
+| `fullnameOverride`             | String to fully override `descheduler.fullname` template                                                              | `""`                                 |
+| `cronJobApiVersion`            | CronJob API Group Version                                                                                             | `"batch/v1"`                         |
+| `schedule`                     | The cron schedule to run the _descheduler_ job on                                                                     | `"*/2 * * * *"`                      |
+| `startingDeadlineSeconds`      | If set, configure `startingDeadlineSeconds` for the _descheduler_ job                                                 | `nil`                                |
+| `successfulJobsHistoryLimit`   | If set, configure `successfulJobsHistoryLimit` for the _descheduler_ job                                              | `nil`                                |
+| `failedJobsHistoryLimit`       | If set, configure `failedJobsHistoryLimit` for the _descheduler_ job                                                  | `nil`                                |
+| `cmdOptions`                   | The options to pass to the _descheduler_ command                                                                      | _see values.yaml_                    |
+| `deschedulerPolicy.strategies` | The _descheduler_ strategies to apply                                                                                 | _see values.yaml_                    |
+| `priorityClassName`            | The name of the priority class to add to pods                                                                         | `system-cluster-critical`            |
+| `rbac.create`                  | If `true`, create & use RBAC resources                                                                                | `true`                               |
+| `podSecurityPolicy.create`     | If `true`, create PodSecurityPolicy                                                                                   | `true`                               |
+| `resources`                    | Descheduler container CPU and memory requests/limits                                                                  | _see values.yaml_                    |
+| `serviceAccount.create`        | If `true`, create a service account for the cron job                                                                  | `true`                               |
+| `serviceAccount.name`          | The name of the service account to use, if not set and create is true a name is generated using the fullname template | `nil`                                |
+| `nodeSelector`                 | Node selectors to run the descheduler cronjob on specific nodes                                                       | `nil`                                |

charts/descheduler/templates/NOTES.txt

@@ -0,0 +1 @@
+Descheduler installed as a cron job.

charts/descheduler/templates/_helpers.tpl

@@ -0,0 +1,56 @@
+{{/* vim: set filetype=mustache: */}}
+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "descheduler.name" -}}
+{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" -}}
+{{- end -}}
+
+{{/*
+Create a default fully qualified app name.
+We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
+If release name contains chart name it will be used as a full name.
+*/}}
+{{- define "descheduler.fullname" -}}
+{{- if .Values.fullnameOverride -}}
+{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" -}}
+{{- else -}}
+{{- $name := default .Chart.Name .Values.nameOverride -}}
+{{- if contains $name .Release.Name -}}
+{{- .Release.Name | trunc 63 | trimSuffix "-" -}}
+{{- else -}}
+{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" -}}
+{{- end -}}
+{{- end -}}
+{{- end -}}
+
+{{/*
+Create chart name and version as used by the chart label.
+*/}}
+{{- define "descheduler.chart" -}}
+{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" -}}
+{{- end -}}
+
+{{/*
+Common labels
+*/}}
+{{- define "descheduler.labels" -}}
+app.kubernetes.io/name: {{ include "descheduler.name" . }}
+helm.sh/chart: {{ include "descheduler.chart" . }}
+app.kubernetes.io/instance: {{ .Release.Name }}
+{{- if .Chart.AppVersion }}
+app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
+{{- end }}
+app.kubernetes.io/managed-by: {{ .Release.Service }}
+{{- end -}}
+
+{{/*
+Create the name of the service account to use
+*/}}
+{{- define "descheduler.serviceAccountName" -}}
+{{- if .Values.serviceAccount.create -}}
+    {{ default (include "descheduler.fullname" .) .Values.serviceAccount.name }}
+{{- else -}}
+    {{ default "default" .Values.serviceAccount.name }}
+{{- end -}}
+{{- end -}}

charts/descheduler/templates/clusterrole.yaml

@@ -0,0 +1,34 @@
+{{- if .Values.rbac.create -}}
+kind: ClusterRole
+apiVersion: rbac.authorization.k8s.io/v1
+metadata:
+  name: {{ template "descheduler.fullname" . }}
+  labels:
+    {{- include "descheduler.labels" . | nindent 4 }}
+rules:
+- apiGroups: [""]
+  resources: ["events"]
+  verbs: ["create", "update"]
+- apiGroups: [""]
+  resources: ["nodes"]
+  verbs: ["get", "watch", "list"]
+- apiGroups: [""]
+  resources: ["namespaces"]
+  verbs: ["get", "list"]
+- apiGroups: [""]
+  resources: ["pods"]
+  verbs: ["get", "watch", "list", "delete"]
+- apiGroups: [""]
+  resources: ["pods/eviction"]
+  verbs: ["create"]
+- apiGroups: ["scheduling.k8s.io"]
+  resources: ["priorityclasses"]
+  verbs: ["get", "watch", "list"]
+{{- if .Values.podSecurityPolicy.create }}
+- apiGroups: ['policy']
+  resources: ['podsecuritypolicies']
+  verbs:     ['use']
+  resourceNames:
+  - {{ template "descheduler.fullname" . }}
+{{- end }}
+{{- end -}}

charts/descheduler/templates/clusterrolebinding.yaml

@@ -0,0 +1,16 @@
+{{- if .Values.rbac.create -}}
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: {{ template "descheduler.fullname" . }}
+  labels:
+    {{- include "descheduler.labels" . | nindent 4 }}
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: {{ template "descheduler.fullname" . }}
+subjects:
+  - kind: ServiceAccount
+    name: {{ template "descheduler.serviceAccountName" . }}
+    namespace: {{ .Release.Namespace }}
+{{- end -}}

charts/descheduler/templates/configmap.yaml

@@ -0,0 +1,11 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: {{ template "descheduler.fullname" . }}
+  labels:
+    {{- include "descheduler.labels" . | nindent 4 }}
+data:
+  policy.yaml: |
+    apiVersion: "descheduler/v1alpha1"
+    kind: "DeschedulerPolicy"
+{{ toYaml .Values.deschedulerPolicy | trim | indent 4 }}

charts/descheduler/templates/cronjob.yaml

@@ -0,0 +1,76 @@
+apiVersion: {{ .Values.cronJobApiVersion | default "batch/v1" }}
+kind: CronJob
+metadata:
+  name: {{ template "descheduler.fullname" . }}
+  labels:
+    {{- include "descheduler.labels" . | nindent 4 }}
+spec:
+  schedule: {{ .Values.schedule | quote }}
+  concurrencyPolicy: "Forbid"
+  {{- if .Values.startingDeadlineSeconds }}
+  startingDeadlineSeconds: {{ .Values.startingDeadlineSeconds }}
+  {{- end }}
+  {{- if .Values.successfulJobsHistoryLimit }}
+  successfulJobsHistoryLimit: {{ .Values.successfulJobsHistoryLimit }}
+  {{- end }}
+  {{- if .Values.failedJobsHistoryLimit }}
+  failedJobsHistoryLimit: {{ .Values.failedJobsHistoryLimit }}
+  {{- end }}
+  jobTemplate:
+    spec:
+      template:
+        metadata:
+          name: {{ template "descheduler.fullname" . }}
+          annotations:
+            checksum/config: {{ include (print $.Template.BasePath "/configmap.yaml") . | sha256sum }}
+            {{- if .Values.podAnnotations }}
+            {{- .Values.podAnnotations | toYaml | nindent 12 }}
+            {{- end }}
+          labels:
+            app.kubernetes.io/name: {{ include "descheduler.name" . }}
+            app.kubernetes.io/instance: {{ .Release.Name }}
+            {{- if .Values.podLabels }}
+            {{- .Values.podLabels | toYaml | nindent 12 }}
+            {{- end }}
+        spec:
+          {{- with .Values.nodeSelector }}
+          nodeSelector:
+            {{- toYaml . | nindent 12 }}
+          {{- end }}
+          {{- if .Values.priorityClassName }}
+          priorityClassName: {{ .Values.priorityClassName }}
+          {{- end }}
+          serviceAccountName: {{ template "descheduler.serviceAccountName" . }}
+          restartPolicy: "Never"
+          containers:
+            - name: {{ .Chart.Name }}
+              image: "{{ .Values.image.repository }}:{{ .Values.image.tag | default (printf "v%s" .Chart.AppVersion) }}"
+              imagePullPolicy: {{ .Values.image.pullPolicy }}
+              command:
+                - "/bin/descheduler"
+              args:
+                - "--policy-config-file"
+                - "/policy-dir/policy.yaml"
+                {{- range $key, $value := .Values.cmdOptions }}
+                - {{ printf "--%s" $key | quote }}
+                {{- if $value }}
+                - {{ $value | quote }}
+                {{- end }}
+                {{- end }}
+              resources:
+                {{- toYaml .Values.resources | nindent 16 }}
+              securityContext:
+                allowPrivilegeEscalation: false
+                capabilities:
+                  drop:
+                    - ALL
+                privileged: false
+                readOnlyRootFilesystem: true
+                runAsNonRoot: true
+              volumeMounts:
+                - mountPath: /policy-dir
+                  name: policy-volume
+          volumes:
+          - name: policy-volume
+            configMap:
+              name: {{ template "descheduler.fullname" . }}

charts/descheduler/templates/podsecuritypolicy.yaml

@@ -0,0 +1,38 @@
+{{- if .Values.podSecurityPolicy.create -}}
+apiVersion: policy/v1beta1
+kind: PodSecurityPolicy
+metadata:
+  name: {{ template "descheduler.fullname" . }}
+  annotations:
+    seccomp.security.alpha.kubernetes.io/allowedProfileNames: 'docker/default,runtime/default'
+    seccomp.security.alpha.kubernetes.io/defaultProfileName:  'runtime/default'
+spec:
+  privileged: false
+  allowPrivilegeEscalation: false
+  requiredDropCapabilities:
+    - ALL
+  volumes:
+    - 'configMap'
+    - 'secret'
+  hostNetwork: false
+  hostIPC: false
+  hostPID: false
+  runAsUser:
+    rule: 'MustRunAs'
+    ranges:
+      - min: 1
+        max: 65535
+  seLinux:
+    rule: 'RunAsAny'
+  supplementalGroups:
+    rule: 'MustRunAs'
+    ranges:
+      - min: 1
+        max: 65535
+  fsGroup:
+    rule: 'MustRunAs'
+    ranges:
+      - min: 1
+        max: 65535
+  readOnlyRootFilesystem: true
+{{- end -}}

charts/descheduler/templates/serviceaccount.yaml

@@ -0,0 +1,8 @@
+{{- if .Values.serviceAccount.create -}}
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: {{ template "descheduler.serviceAccountName" . }}
+  labels:
+    {{- include "descheduler.labels" . | nindent 4 }}
+{{- end -}}

charts/descheduler/templates/tests/test-descheduler-pod.yaml

@@ -0,0 +1,29 @@
+apiVersion: v1
+kind: Pod
+metadata:
+    name: descheduler-test-pod
+    annotations:
+      "helm.sh/hook": test
+spec:
+    restartPolicy: Never
+    serviceAccountName: descheduler-ci
+    containers:
+      - name: descheduler-test-container
+        image: alpine:latest
+        imagePullPolicy: IfNotPresent
+        securityContext:
+            allowPrivilegeEscalation: false
+            capabilities:
+              drop:
+                - All
+            privileged: false
+            runAsNonRoot: false 
+        command: ["/bin/ash"]
+        args:
+          - -c
+          - >-
+            apk --no-cache add curl &&
+            curl -LO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl &&
+            chmod +x ./kubectl &&
+            mv ./kubectl /usr/local/bin/kubectl &&
+            /usr/local/bin/kubectl get pods --namespace kube-system --token "$(cat /var/run/secrets/kubernetes.io/serviceaccount/token)" | grep "descheduler" | grep "Completed"

charts/descheduler/values.yaml

@@ -0,0 +1,78 @@
+# Default values for descheduler.
+# This is a YAML-formatted file.
+# Declare variables to be passed into your templates.
+
+image:
+  repository: k8s.gcr.io/descheduler/descheduler
+  # Overrides the image tag whose default is the chart version
+  tag: ""
+  pullPolicy: IfNotPresent
+
+resources:
+  requests:
+    cpu: 500m
+    memory: 256Mi
+  # limits:
+  #   cpu: 100m
+  #   memory: 128Mi
+
+nameOverride: ""
+fullnameOverride: ""
+
+cronJobApiVersion: "batch/v1"  # Use "batch/v1beta1" for k8s version < 1.21.0. TODO(@7i) remove with 1.23 release
+schedule: "*/2 * * * *"
+#startingDeadlineSeconds: 200
+#successfulJobsHistoryLimit: 1
+#failedJobsHistoryLimit: 1
+
+cmdOptions:
+  v: 3
+  # evict-local-storage-pods:
+  # max-pods-to-evict-per-node: 10
+  # node-selector: "key1=value1,key2=value2"
+
+deschedulerPolicy:
+  strategies:
+    RemoveDuplicates:
+      enabled: true
+    RemovePodsViolatingNodeTaints:
+      enabled: true
+    RemovePodsViolatingNodeAffinity:
+      enabled: true
+      params:
+        nodeAffinityType:
+        - requiredDuringSchedulingIgnoredDuringExecution
+    RemovePodsViolatingInterPodAntiAffinity:
+      enabled: true
+    LowNodeUtilization:
+      enabled: true
+      params:
+        nodeResourceUtilizationThresholds:
+          thresholds:
+            cpu: 20
+            memory: 20
+            pods: 20
+          targetThresholds:
+            cpu: 50
+            memory: 50
+            pods: 50
+
+priorityClassName: system-cluster-critical
+
+nodeSelector: {}
+#  foo: bar
+
+rbac:
+  # Specifies whether RBAC resources should be created
+  create: true
+
+podSecurityPolicy:
+  # Specifies whether PodSecurityPolicy should be created.
+  create: true
+
+serviceAccount:
+  # Specifies whether a ServiceAccount should be created
+  create: true
+  # The name of the ServiceAccount to use.
+  # If not set and create is true, a name is generated using the fullname template
+  name:

cloudbuild.yaml

@@ -14,7 +14,7 @@ steps:
     - VERSION=$_GIT_TAG
     - BASE_REF=$_PULL_BASE_REF
     args:
-    - push
+    - push-all
 substitutions:
   # _GIT_TAG will be filled with a git-based tag for the image, of the form vYYYYMMDD-hash, and
   # can be used as a substitution

cmd/descheduler/app/options/options.go

@@ -18,44 +18,80 @@ limitations under the License.
 package options
 
 import (
-	clientset "k8s.io/client-go/kubernetes"
+	"github.com/spf13/pflag"
+
+	utilerrors "k8s.io/apimachinery/pkg/util/errors"
+	apiserveroptions "k8s.io/apiserver/pkg/server/options"
+	clientset "k8s.io/client-go/kubernetes"
+	"k8s.io/component-base/logs"
 
-	// install the componentconfig api so we get its defaulting and conversion functions
 	"sigs.k8s.io/descheduler/pkg/apis/componentconfig"
 	"sigs.k8s.io/descheduler/pkg/apis/componentconfig/v1alpha1"
 	deschedulerscheme "sigs.k8s.io/descheduler/pkg/descheduler/scheme"
+)
 
-	"github.com/spf13/pflag"
+const (
+	DefaultDeschedulerPort = 10258
 )
 
 // DeschedulerServer configuration
 type DeschedulerServer struct {
 	componentconfig.DeschedulerConfiguration
-	Client clientset.Interface
+
+	Client         clientset.Interface
+	Logs           *logs.Options
+	SecureServing  *apiserveroptions.SecureServingOptionsWithLoopback
+	DisableMetrics bool
 }
 
 // NewDeschedulerServer creates a new DeschedulerServer with default parameters
-func NewDeschedulerServer() *DeschedulerServer {
-	versioned := v1alpha1.DeschedulerConfiguration{}
-	deschedulerscheme.Scheme.Default(&versioned)
-	cfg := componentconfig.DeschedulerConfiguration{}
-	deschedulerscheme.Scheme.Convert(versioned, &cfg, nil)
-	s := DeschedulerServer{
-		DeschedulerConfiguration: cfg,
+func NewDeschedulerServer() (*DeschedulerServer, error) {
+	cfg, err := newDefaultComponentConfig()
+	if err != nil {
+		return nil, err
 	}
-	return &s
+
+	secureServing := apiserveroptions.NewSecureServingOptions().WithLoopback()
+	secureServing.BindPort = DefaultDeschedulerPort
+
+	return &DeschedulerServer{
+		DeschedulerConfiguration: *cfg,
+		Logs:                     logs.NewOptions(),
+		SecureServing:            secureServing,
+	}, nil
+}
+
+// Validation checks for DeschedulerServer.
+func (s *DeschedulerServer) Validate() error {
+	var errs []error
+	errs = append(errs, s.Logs.Validate()...)
+	return utilerrors.NewAggregate(errs)
+}
+
+func newDefaultComponentConfig() (*componentconfig.DeschedulerConfiguration, error) {
+	versionedCfg := v1alpha1.DeschedulerConfiguration{}
+	deschedulerscheme.Scheme.Default(&versionedCfg)
+	cfg := componentconfig.DeschedulerConfiguration{}
+	if err := deschedulerscheme.Scheme.Convert(&versionedCfg, &cfg, nil); err != nil {
+		return nil, err
+	}
+	return &cfg, nil
 }
 
 // AddFlags adds flags for a specific SchedulerServer to the specified FlagSet
 func (rs *DeschedulerServer) AddFlags(fs *pflag.FlagSet) {
+	fs.StringVar(&rs.Logging.Format, "logging-format", "text", `Sets the log format. Permitted formats: "text", "json". Non-default formats don't honor these flags: --add-dir-header, --alsologtostderr, --log-backtrace-at, --log-dir, --log-file, --log-file-max-size, --logtostderr, --skip-headers, --skip-log-headers, --stderrthreshold, --log-flush-frequency.\nNon-default choices are currently alpha and subject to change without warning.`)
 	fs.DurationVar(&rs.DeschedulingInterval, "descheduling-interval", rs.DeschedulingInterval, "Time interval between two consecutive descheduler executions. Setting this value instructs the descheduler to run in a continuous loop at the interval specified.")
 	fs.StringVar(&rs.KubeconfigFile, "kubeconfig", rs.KubeconfigFile, "File with  kube configuration.")
 	fs.StringVar(&rs.PolicyConfigFile, "policy-config-file", rs.PolicyConfigFile, "File with descheduler policy configuration.")
 	fs.BoolVar(&rs.DryRun, "dry-run", rs.DryRun, "execute descheduler in dry run mode.")
 	// node-selector query causes descheduler to run only on nodes that matches the node labels in the query
-	fs.StringVar(&rs.NodeSelector, "node-selector", rs.NodeSelector, "Selector (label query) to filter on, supports '=', '==', and '!='.(e.g. -l key1=value1,key2=value2)")
+	fs.StringVar(&rs.NodeSelector, "node-selector", rs.NodeSelector, "DEPRECATED: selector (label query) to filter on, supports '=', '==', and '!='.(e.g. -l key1=value1,key2=value2)")
 	// max-no-pods-to-evict limits the maximum number of pods to be evicted per node by descheduler.
-	fs.IntVar(&rs.MaxNoOfPodsToEvictPerNode, "max-pods-to-evict-per-node", rs.MaxNoOfPodsToEvictPerNode, "Limits the maximum number of pods to be evicted per node by descheduler")
+	fs.IntVar(&rs.MaxNoOfPodsToEvictPerNode, "max-pods-to-evict-per-node", rs.MaxNoOfPodsToEvictPerNode, "DEPRECATED: limits the maximum number of pods to be evicted per node by descheduler")
 	// evict-local-storage-pods allows eviction of pods that are using local storage. This is false by default.
-	fs.BoolVar(&rs.EvictLocalStoragePods, "evict-local-storage-pods", rs.EvictLocalStoragePods, "Enables evicting pods using local storage by descheduler")
+	fs.BoolVar(&rs.EvictLocalStoragePods, "evict-local-storage-pods", rs.EvictLocalStoragePods, "DEPRECATED: enables evicting pods using local storage by descheduler")
+	fs.BoolVar(&rs.DisableMetrics, "disable-metrics", rs.DisableMetrics, "Disables metrics. The metrics are by default served through https://localhost:10258/metrics. Secure address, resp. port can be changed through --bind-address, resp. --secure-port flags.")
+
+	rs.SecureServing.AddFlags(fs)
 }

cmd/descheduler/app/server.go

@@ -18,6 +18,7 @@ limitations under the License.
 package app
 
 import (
+	"context"
 	"flag"
 	"io"
 
@@ -26,29 +27,61 @@ import (
 
 	"github.com/spf13/cobra"
 
+	apiserver "k8s.io/apiserver/pkg/server"
+	"k8s.io/apiserver/pkg/server/mux"
+	restclient "k8s.io/client-go/rest"
 	aflag "k8s.io/component-base/cli/flag"
-	"k8s.io/component-base/logs"
-	"k8s.io/klog"
+	"k8s.io/component-base/metrics/legacyregistry"
+	"k8s.io/klog/v2"
 )
 
 // NewDeschedulerCommand creates a *cobra.Command object with default parameters
 func NewDeschedulerCommand(out io.Writer) *cobra.Command {
-	s := options.NewDeschedulerServer()
+	s, err := options.NewDeschedulerServer()
+
+	if err != nil {
+		klog.ErrorS(err, "unable to initialize server")
+	}
+
 	cmd := &cobra.Command{
 		Use:   "descheduler",
 		Short: "descheduler",
 		Long:  `The descheduler evicts pods which may be bound to less desired nodes`,
 		Run: func(cmd *cobra.Command, args []string) {
-			logs.InitLogs()
-			defer logs.FlushLogs()
+			s.Logs.LogFormat = s.Logging.Format
+			s.Logs.Apply()
+
+			// LoopbackClientConfig is a config for a privileged loopback connection
+			var LoopbackClientConfig *restclient.Config
+			var SecureServing *apiserver.SecureServingInfo
+			if err := s.SecureServing.ApplyTo(&SecureServing, &LoopbackClientConfig); err != nil {
+				klog.ErrorS(err, "failed to apply secure server configuration")
+				return
+			}
+
+			if err := s.Validate(); err != nil {
+				klog.ErrorS(err, "failed to validate server configuration")
+				return
+			}
+
+			if !s.DisableMetrics {
+				ctx := context.TODO()
+				pathRecorderMux := mux.NewPathRecorderMux("descheduler")
+				pathRecorderMux.Handle("/metrics", legacyregistry.HandlerWithReset())
+
+				if _, err := SecureServing.Serve(pathRecorderMux, 0, ctx.Done()); err != nil {
+					klog.Fatalf("failed to start secure server: %v", err)
+					return
+				}
+			}
+
 			err := Run(s)
 			if err != nil {
-				klog.Errorf("%v", err)
+				klog.ErrorS(err, "descheduler server")
 			}
 		},
 	}
-	cmd.SetOutput(out)
-
+	cmd.SetOut(out)
 	flags := cmd.Flags()
 	flags.SetNormalizeFunc(aflag.WordSepNormalizeFunc)
 	flags.AddGoFlagSet(flag.CommandLine)

cmd/descheduler/app/version.go

@@ -18,70 +18,19 @@ package app
 
 import (
 	"fmt"
-	"runtime"
-	"strings"
 
 	"github.com/spf13/cobra"
+	"sigs.k8s.io/descheduler/pkg/version"
 )
 
-var (
-	// gitCommit is a constant representing the source version that
-	// generated this build. It should be set during build via -ldflags.
-	gitCommit string
-	// version is a constant representing the version tag that
-	// generated this build. It should be set during build via -ldflags.
-	version string
-	// buildDate in ISO8601 format, output of $(date -u +'%Y-%m-%dT%H:%M:%SZ')
-	//It should be set during build via -ldflags.
-	buildDate string
-)
-
-// Info holds the information related to descheduler app version.
-type Info struct {
-	Major      string `json:"major"`
-	Minor      string `json:"minor"`
-	GitCommit  string `json:"gitCommit"`
-	GitVersion string `json:"gitVersion"`
-	BuildDate  string `json:"buildDate"`
-	GoVersion  string `json:"goVersion"`
-	Compiler   string `json:"compiler"`
-	Platform   string `json:"platform"`
-}
-
-// Get returns the overall codebase version. It's for detecting
-// what code a binary was built from.
-func Get() Info {
-	majorVersion, minorVersion := splitVersion(version)
-	return Info{
-		Major:      majorVersion,
-		Minor:      minorVersion,
-		GitCommit:  gitCommit,
-		GitVersion: version,
-		BuildDate:  buildDate,
-		GoVersion:  runtime.Version(),
-		Compiler:   runtime.Compiler,
-		Platform:   fmt.Sprintf("%s/%s", runtime.GOOS, runtime.GOARCH),
-	}
-}
-
 func NewVersionCommand() *cobra.Command {
 	var versionCmd = &cobra.Command{
 		Use:   "version",
 		Short: "Version of descheduler",
 		Long:  `Prints the version of descheduler.`,
 		Run: func(cmd *cobra.Command, args []string) {
-			fmt.Printf("Descheduler version %+v\n", Get())
+			fmt.Printf("Descheduler version %+v\n", version.Get())
 		},
 	}
 	return versionCmd
 }
-
-// splitVersion splits the git version to generate major and minor versions needed.
-func splitVersion(version string) (string, string) {
-	if version == "" {
-		return "", ""
-	}
-	// A sample version would be of form v0.1.0-7-ge884046, so split at first '.' and
-	// then return 0 and 1+(+ appended to follow semver convention) for major and minor versions.
-	return strings.Trim(strings.Split(version, ".")[0], "v"), strings.Split(version, ".")[1] + "+"
-}

cmd/descheduler/descheduler.go

@@ -17,10 +17,9 @@ limitations under the License.
 package main
 
 import (
-	"flag"
 	"fmt"
+	"k8s.io/component-base/logs"
 	"os"
-
 	"sigs.k8s.io/descheduler/cmd/descheduler/app"
 )
 
@@ -28,7 +27,10 @@ func main() {
 	out := os.Stdout
 	cmd := app.NewDeschedulerCommand(out)
 	cmd.AddCommand(app.NewVersionCommand())
-	flag.CommandLine.Parse([]string{})
+
+	logs.InitLogs()
+	defer logs.FlushLogs()
+
 	if err := cmd.Execute(); err != nil {
 		fmt.Println(err)
 		os.Exit(1)

docs/contributor-guide.md

@@ -3,10 +3,10 @@
 ## Required Tools
 
 - [Git](https://git-scm.com/downloads)
-- [Go 1.13+](https://golang.org/dl/)
+- [Go 1.16+](https://golang.org/dl/)
 - [Docker](https://docs.docker.com/install/)
 - [kubectl](https://kubernetes.io/docs/tasks/tools/install-kubectl)
-- [kind](https://kind.sigs.k8s.io/)
+- [kind v0.10.0+](https://kind.sigs.k8s.io/)
 
 ## Build and Run
 
@@ -34,9 +34,23 @@ GOOS=linux make dev-image
 kind create cluster --config hack/kind_config.yaml
 kind load docker-image <image name>
 kind get kubeconfig > /tmp/admin.conf
+export KUBECONFIG=/tmp/admin.conf
 make test-unit
 make test-e2e
 ```
 
+## Run Helm Tests
+Run the helm test for a particular descheduler release by setting below variables,
+```
+HELM_IMAGE_REPO="descheduler"
+HELM_IMAGE_TAG="helm-test"
+HELM_CHART_LOCATION="./charts/descheduler"
+```
+The helm tests runs as part of descheduler CI. But, to run it manually from the descheduler root,
+
+```
+make test-helm
+```
+
 ### Miscellaneous
-See the [hack directory](https://github.com/kubernetes-sigs/descheduler/tree/master/hack) for additional tools and scripts used for developing the descheduler.
+See the [hack directory](https://github.com/kubernetes-sigs/descheduler/tree/master/hack) for additional tools and scripts used for developing the descheduler.

docs/release-guide.md

@@ -1,32 +1,42 @@
 # Release Guide
 
-## Semi-automatic
+## Container Image
+
+### Semi-automatic
 
 1. Make sure your repo is clean by git's standards
 2. Create a release branch `git checkout -b release-1.18` (not required for patch releases)
 3. Push the release branch to the descheuler repo and ensure branch protection is enabled (not required for patch releases)
-4. Tag the repository and push the tag `VERSION=v0.18.0 git tag -m $VERSION $VERSION; git push origin $VERSION`
+4. Tag the repository from the `master` branch (from the `release-1.18` branch for a patch release) and push the tag `VERSION=v0.18.0 git tag -m $VERSION $VERSION; git push origin $VERSION`
 5. Publish a draft release using the tag you just created
 6. Perform the [image promotion process](https://github.com/kubernetes/k8s.io/tree/master/k8s.gcr.io#image-promoter)
 7. Publish release
 8. Email `kubernetes-sig-scheduling@googlegroups.com` to announce the release
 
-## Manual
+### Manual
 
 1. Make sure your repo is clean by git's standards
 2. Create a release branch `git checkout -b release-1.18` (not required for patch releases)
 3. Push the release branch to the descheuler repo and ensure branch protection is enabled (not required for patch releases)
-4. Tag the repository and push the tag `VERSION=v0.18.0 git tag -m $VERSION $VERSION; git push origin $VERSION`
+4. Tag the repository from the `master` branch (from the `release-1.18` branch for a patch release) and push the tag `VERSION=v0.18.0 git tag -m $VERSION $VERSION; git push origin $VERSION`
 5. Checkout the tag you just created and make sure your repo is clean by git's standards `git checkout $VERSION`
-6. Build and push the container image to the staging registry `VERSION=$VERSION make push`
+6. Build and push the container image to the staging registry `VERSION=$VERSION make push-all`
 7. Publish a draft release using the tag you just created
 8. Perform the [image promotion process](https://github.com/kubernetes/k8s.io/tree/master/k8s.gcr.io#image-promoter)
 9. Publish release
 10. Email `kubernetes-sig-scheduling@googlegroups.com` to announce the release
 
-## Notes
+### Notes
+It's important to create the tag on the master branch after creating the release-* branch so that the [Helm releaser-action](#helm-chart) can work.
+It compares the changes in the action-triggering branch to the latest tag on that branch, so if you tag before creating the new branch there
+will be nothing to compare and it will fail (creating a new release branch usually involves no code changes). For this same reason, you should
+also tag patch releases (on the release-* branch) *after* pushing changes (if those changes involve bumping the Helm chart version).
+
 See [post-descheduler-push-images dashboard](https://testgrid.k8s.io/sig-scheduling#post-descheduler-push-images) for staging registry image build job status.
 
+View the descheduler staging registry using [this URL](https://console.cloud.google.com/gcr/images/k8s-staging-descheduler/GLOBAL/descheduler) in a web browser
+or use the below `gcloud` commands.
+
 List images in staging registry.
 ```
 gcloud container images list --repository gcr.io/k8s-staging-descheduler
@@ -46,3 +56,19 @@ Pull image from the staging registry.
 ```
 docker pull gcr.io/k8s-staging-descheduler/descheduler:v20200206-0.9.0-94-ge2a23f284
 ```
+
+## Helm Chart
+Helm chart releases are managed by a separate set of git tags that are prefixed with `descheduler-helm-chart-*`. Example git tag name is `descheduler-helm-chart-0.18.0`.
+Released versions of the helm charts are stored in the `gh-pages` branch of this repo. The [chart-releaser-action GitHub Action](https://github.com/helm/chart-releaser-action)
+is setup to build and push the helm charts to the `gh-pages` branch when changes are pushed to a `release-*` branch.
+
+The major and minor version of the chart matches the descheduler major and minor versions. For example descheduler helm chart version helm-descheduler-chart-0.18.0 corresponds
+to descheduler version v0.18.0. The patch version of the descheduler helm chart and the patcher version of the descheduler will not necessarily match. The patch
+version of the descheduler helm chart is used to version changes specific to the helm chart.
+
+1. Merge all helm chart changes into the master branch before the release is tagged/cut
+   1. Ensure that `appVersion` in file `charts/descheduler/Chart.yaml` matches the descheduler version(no `v` prefix)
+   2. Ensure that `version` in file `charts/descheduler/Chart.yaml` has been incremented. This is the chart version.
+2. Make sure your repo is clean by git's standards
+3. Follow the release-branch or patch release tagging pattern from the above section.
+4. Verify the new helm artifact has been successfully pushed to the `gh-pages` branch

docs/user-guide.md

@@ -1,9 +1,23 @@
 # User Guide
 
-Starting with descheduler release v0.10.0 container images are available in these container registries.
-* `asia.gcr.io/k8s-artifacts-prod/descheduler/descheduler`
-* `eu.gcr.io/k8s-artifacts-prod/descheduler/descheduler`
-* `us.gcr.io/k8s-artifacts-prod/descheduler/descheduler`
+Starting with descheduler release v0.10.0 container images are available in the official k8s container registry.
+
+Descheduler Version | Container Image                                     | Architectures           |
+------------------- |-----------------------------------------------------|-------------------------|
+v0.21.0             | k8s.gcr.io/descheduler/descheduler:v0.21.0          | AMD64<br>ARM64<br>ARMv7 |
+v0.20.0             | k8s.gcr.io/descheduler/descheduler:v0.20.0          | AMD64<br>ARM64          |
+v0.19.0             | k8s.gcr.io/descheduler/descheduler:v0.19.0          | AMD64                   |
+v0.18.0             | k8s.gcr.io/descheduler/descheduler:v0.18.0          | AMD64                   |
+v0.10.0             | k8s.gcr.io/descheduler/descheduler:v0.10.0          | AMD64                   |
+
+Note that multi-arch container images cannot be pulled by [kind](https://kind.sigs.k8s.io) from a registry. Therefore
+starting with descheduler release v0.20.0 use the below process to download the official descheduler
+image into a kind cluster.
+```
+kind create cluster
+docker pull k8s.gcr.io/descheduler/descheduler:v0.20.0
+kind load docker-image k8s.gcr.io/descheduler/descheduler:v0.20.0
+```
 
 ## Policy Configuration Examples
 The [examples](https://github.com/kubernetes-sigs/descheduler/tree/master/examples) directory has descheduler policy configuration examples.
@@ -23,11 +37,11 @@ Available Commands:
   version     Version of descheduler
 
 Flags:
-      --add-dir-header                   If true, adds the file directory to the header
+      --add-dir-header                   If true, adds the file directory to the header of the log messages
       --alsologtostderr                  log to standard error as well as files
       --descheduling-interval duration   Time interval between two consecutive descheduler executions. Setting this value instructs the descheduler to run in a continuous loop at the interval specified.
       --dry-run                          execute descheduler in dry run mode.
-      --evict-local-storage-pods         Enables evicting pods using local storage by descheduler
+      --evict-local-storage-pods         DEPRECATED: enables evicting pods using local storage by descheduler
   -h, --help                             help for descheduler
       --kubeconfig string                File with  kube configuration.
       --log-backtrace-at traceLocation   when logging hits line file:N, emit a stack trace (default :0)
@@ -36,8 +50,8 @@ Flags:
       --log-file-max-size uint           Defines the maximum size a log file can grow to. Unit is megabytes. If the value is 0, the maximum file size is unlimited. (default 1800)
       --log-flush-frequency duration     Maximum number of seconds between log flushes (default 5s)
       --logtostderr                      log to standard error instead of files (default true)
-      --max-pods-to-evict-per-node int   Limits the maximum number of pods to be evicted per node by descheduler
-      --node-selector string             Selector (label query) to filter on, supports '=', '==', and '!='.(e.g. -l key1=value1,key2=value2)
+      --max-pods-to-evict-per-node int   DEPRECATED: limits the maximum number of pods to be evicted per node by descheduler
+      --node-selector string             DEPRECATED: selector (label query) to filter on, supports '=', '==', and '!='.(e.g. -l key1=value1,key2=value2)
       --policy-config-file string        File with descheduler policy configuration.
       --skip-headers                     If true, avoid header prefixes in the log messages
       --skip-log-headers                 If true, avoid headers when opening log files
@@ -71,20 +85,57 @@ This policy configuration file ensures that pods created more than 7 days ago ar
 apiVersion: "descheduler/v1alpha1"
 kind: "DeschedulerPolicy"
 strategies:
-  "LowNodeUtilization":
-    enabled: false
-  "RemoveDuplicates":
-    enabled: false
-  "RemovePodsViolatingInterPodAntiAffinity":
-    enabled: false
-  "RemovePodsViolatingNodeAffinity":
-    enabled: false
-  "RemovePodsViolatingNodeTaints":
-    enabled: false
-  "RemovePodsHavingTooManyRestarts":
-    enabled: false
   "PodLifeTime":
     enabled: true
     params:
       maxPodLifeTimeSeconds: 604800 # pods run for a maximum of 7 days
 ```
+
+### Balance Cluster By Node Memory Utilization
+If your cluster has been running for a long period of time, you may find that the resource utilization is not very
+balanced. The following two strategies can be used to rebalance your cluster based on `cpu`, `memory` 
+or `number of pods`.
+
+#### Balance high utilization nodes
+Using `LowNodeUtilization`, descheduler will rebalance the cluster based on memory by evicting pods
+from nodes with memory utilization over 70% to nodes with memory utilization below 20%.
+
+```
+apiVersion: "descheduler/v1alpha1"
+kind: "DeschedulerPolicy"
+strategies:
+  "LowNodeUtilization":
+    enabled: true
+    params:
+      nodeResourceUtilizationThresholds:
+        thresholds:
+          "memory": 20
+        targetThresholds:
+          "memory": 70
+```
+
+#### Balance low utilization nodes
+Using `HighNodeUtilization`, descheduler will rebalance the cluster based on memory by evicting pods
+from nodes with memory utilization lower than 20%. This should be used along with scheduler strategy `MostRequestedPriority`.
+The evicted pods will be compacted into minimal set of nodes.
+
+```
+apiVersion: "descheduler/v1alpha1"
+kind: "DeschedulerPolicy"
+strategies:
+  "HighNodeUtilization":
+    enabled: true
+    params:
+      nodeResourceUtilizationThresholds:
+        thresholds:
+          "memory": 20
+```
+
+### Autoheal Node Problems
+Descheduler's `RemovePodsViolatingNodeTaints` strategy can be combined with
+[Node Problem Detector](https://github.com/kubernetes/node-problem-detector/) and
+[Cluster Autoscaler](https://github.com/kubernetes/autoscaler/tree/master/cluster-autoscaler) to automatically remove
+Nodes which have problems. Node Problem Detector can detect specific Node problems and taint any Nodes which have those
+problems. The Descheduler will then deschedule workloads from those Nodes. Finally, if the descheduled Node's resource
+allocation falls below the Cluster Autoscaler's scale down threshold, the Node will become a scale down candidate
+and can be removed by Cluster Autoscaler. These three components form an autohealing cycle for Node problems.

examples/high-node-utilization.yml

@@ -0,0 +1,10 @@
+---
+apiVersion: "descheduler/v1alpha1"
+kind: "DeschedulerPolicy"
+strategies:
+  "HighNodeUtilization":
+    enabled: true
+    params:
+      nodeResourceUtilizationThresholds:
+        thresholds:
+          "memory": 20

examples/low-node-utilization.yml

@@ -0,0 +1,12 @@
+---
+apiVersion: "descheduler/v1alpha1"
+kind: "DeschedulerPolicy"
+strategies:
+  "LowNodeUtilization":
+    enabled: true
+    params:
+      nodeResourceUtilizationThresholds:
+        thresholds:
+          "memory": 20
+        targetThresholds:
+          "memory": 70

examples/pod-life-time.yml

@@ -2,19 +2,8 @@
 apiVersion: "descheduler/v1alpha1"
 kind: "DeschedulerPolicy"
 strategies:
-  "LowNodeUtilization":
-    enabled: false
-  "RemoveDuplicates":
-    enabled: false
-  "RemovePodsViolatingInterPodAntiAffinity":
-    enabled: false
-  "RemovePodsViolatingNodeAffinity":
-    enabled: false
-  "RemovePodsViolatingNodeTaints":
-    enabled: false
-  "RemovePodsHavingTooManyRestarts":
-    enabled: false
   "PodLifeTime":
     enabled: true
     params:
-      maxPodLifeTimeSeconds: 604800 # 7 days
+      podLifeTime:
+        maxPodLifeTimeSeconds: 604800 # 7 days

examples/policy.yaml

@@ -21,5 +21,5 @@ strategies:
      enabled: true
      params:
        podsHavingTooManyRestarts:
-         podRestartThresholds: 100
+         podRestartThreshold: 100
          includingInitContainers: true

go.mod

@@ -1,14 +1,19 @@
 module sigs.k8s.io/descheduler
 
-go 1.13
+go 1.16
 
 require (
-	github.com/spf13/cobra v0.0.5
+	github.com/client9/misspell v0.3.4
+	github.com/spf13/cobra v1.1.1
 	github.com/spf13/pflag v1.0.5
-	k8s.io/api v0.18.2
-	k8s.io/apimachinery v0.18.2
-	k8s.io/apiserver v0.18.2
-	k8s.io/client-go v0.18.2
-	k8s.io/component-base v0.18.2
-	k8s.io/klog v1.0.0
+	k8s.io/api v0.21.0
+	k8s.io/apimachinery v0.21.0
+	k8s.io/apiserver v0.21.0
+	k8s.io/client-go v0.21.0
+	k8s.io/code-generator v0.21.0
+	k8s.io/component-base v0.21.0
+	k8s.io/component-helpers v0.21.0
+	k8s.io/klog/v2 v2.8.0
+	k8s.io/kubectl v0.20.5
+	sigs.k8s.io/mdtoc v1.0.1
 )

go.sum

@@ -1,164 +1,317 @@
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-k8s.io/klog v0.0.0-20181102134211-b9b56d5dfc92/go.mod h1:Gq+BEi5rUBO/HRz0bTSXDUcqjScdoY3a9IHpCEIOOfk=
-k8s.io/klog v0.3.0/go.mod h1:Gq+BEi5rUBO/HRz0bTSXDUcqjScdoY3a9IHpCEIOOfk=
-k8s.io/klog v1.0.0 h1:Pt+yjF5aB1xDSVbau4VsWe+dQNzA0qv1LlXdC2dF6Q8=
-k8s.io/klog v1.0.0/go.mod h1:4Bi6QPql/J/LkTDqv7R/cd3hPo4k2DG6Ptcz060Ez5I=
-k8s.io/kube-openapi v0.0.0-20200121204235-bf4fb3bd569c h1:/KUFqjjqAcY4Us6luF5RDNZ16KJtb49HfR3ZHB9qYXM=
-k8s.io/kube-openapi v0.0.0-20200121204235-bf4fb3bd569c/go.mod h1:GRQhZsXIAJ1xR0C9bd8UpWHZ5plfAS9fzPjJuQ6JL3E=
-k8s.io/utils v0.0.0-20200324210504-a9aa75ae1b89 h1:d4vVOjXm687F1iLSP2q3lyPPuyvTUt3aVoBpi2DqRsU=
-k8s.io/utils v0.0.0-20200324210504-a9aa75ae1b89/go.mod h1:sZAwmy6armz5eXlNoLmJcl4F1QuKu7sr+mFQ0byX7Ew=
-sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.0.7/go.mod h1:PHgbrJT7lCHcxMU+mDHEm+nx46H4zuuHZkDP6icnhu0=
-sigs.k8s.io/structured-merge-diff/v3 v3.0.0-20200116222232-67a7b8c61874/go.mod h1:PlARxl6Hbt/+BC80dRLi1qAmnMqwqDg62YvvVkZjemw=
-sigs.k8s.io/structured-merge-diff/v3 v3.0.0 h1:dOmIZBMfhcHS09XZkMyUgkq5trg3/jRyJYFZUiaOp8E=
-sigs.k8s.io/structured-merge-diff/v3 v3.0.0/go.mod h1:PlARxl6Hbt/+BC80dRLi1qAmnMqwqDg62YvvVkZjemw=
-sigs.k8s.io/yaml v1.1.0 h1:4A07+ZFc2wgJwo8YNlQpr1rVlgUDlxXHhPJciaPY5gs=
+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+k8s.io/api v0.20.5/go.mod h1:FQjAceXnVaWDeov2YUWhOb6Yt+5UjErkp6UO3nczO1Y=
+k8s.io/api v0.21.0 h1:gu5iGF4V6tfVCQ/R+8Hc0h7H1JuEhzyEi9S4R5LM8+Y=
+k8s.io/api v0.21.0/go.mod h1:+YbrhBBGgsxbF6o6Kj4KJPJnBmAKuXDeS3E18bgHNVU=
+k8s.io/apimachinery v0.20.5/go.mod h1:WlLqWAHZGg07AeltaI0MV5uk1Omp8xaN0JGLY6gkRpU=
+k8s.io/apimachinery v0.21.0 h1:3Fx+41if+IRavNcKOz09FwEXDBG6ORh6iMsTSelhkMA=
+k8s.io/apimachinery v0.21.0/go.mod h1:jbreFvJo3ov9rj7eWT7+sYiRx+qZuCYXwWT1bcDswPY=
+k8s.io/apiserver v0.21.0 h1:1hWMfsz+cXxB77k6/y0XxWxwl6l9OF26PC9QneUVn1Q=
+k8s.io/apiserver v0.21.0/go.mod h1:w2YSn4/WIwYuxG5zJmcqtRdtqgW/J2JRgFAqps3bBpg=
+k8s.io/cli-runtime v0.20.5/go.mod h1:ihjPeQWDk7NGVIkNEvpwxA3gJvqtU+LtkDj11TvyXn4=
+k8s.io/client-go v0.20.5/go.mod h1:Ee5OOMMYvlH8FCZhDsacjMlCBwetbGZETwo1OA+e6Zw=
+k8s.io/client-go v0.21.0 h1:n0zzzJsAQmJngpC0IhgFcApZyoGXPrDIAD601HD09ag=
+k8s.io/client-go v0.21.0/go.mod h1:nNBytTF9qPFDEhoqgEPaarobC8QPae13bElIVHzIglA=
+k8s.io/code-generator v0.20.5/go.mod h1:UsqdF+VX4PU2g46NC2JRs4gc+IfrctnwHb76RNbWHJg=
+k8s.io/code-generator v0.21.0 h1:LGWJOvkbBNpuRBqBRXUjzfvymUh7F/iR2KDpwLnqCM4=
+k8s.io/code-generator v0.21.0/go.mod h1:hUlps5+9QaTrKx+jiM4rmq7YmH8wPOIko64uZCHDh6Q=
+k8s.io/component-base v0.20.5/go.mod h1:l0isoBLGyQKwRoTWbPHR6jNDd3/VqQD43cNlsjddGng=
+k8s.io/component-base v0.21.0 h1:tLLGp4BBjQaCpS/KiuWh7m2xqvAdsxLm4ATxHSe5Zpg=
+k8s.io/component-base v0.21.0/go.mod h1:qvtjz6X0USWXbgmbfXR+Agik4RZ3jv2Bgr5QnZzdPYw=
+k8s.io/component-helpers v0.20.5/go.mod h1:AzTdoPj6YAN2SUfhBX/FUUU3ntfFuse03q/VMLovEsE=
+k8s.io/component-helpers v0.21.0 h1:SoWLsd63LI5uwofcHVSO4jtlmZEJRycfwNBKU4eAGPQ=
+k8s.io/component-helpers v0.21.0/go.mod h1:tezqefP7lxfvJyR+0a+6QtVrkZ/wIkyMLK4WcQ3Cj8U=
+k8s.io/gengo v0.0.0-20200413195148-3a45101e95ac/go.mod h1:ezvh/TsK7cY6rbqRK0oQQ8IAqLxYwwyPxAX1Pzy0ii0=
+k8s.io/gengo v0.0.0-20201113003025-83324d819ded/go.mod h1:FiNAH4ZV3gBg2Kwh89tzAEV2be7d5xI0vBa/VySYy3E=
+k8s.io/gengo v0.0.0-20201214224949-b6c5ce23f027 h1:Uusb3oh8XcdzDF/ndlI4ToKTYVlkCSJP39SRY2mfRAw=
+k8s.io/gengo v0.0.0-20201214224949-b6c5ce23f027/go.mod h1:FiNAH4ZV3gBg2Kwh89tzAEV2be7d5xI0vBa/VySYy3E=
+k8s.io/klog/v2 v2.0.0/go.mod h1:PBfzABfn139FHAV07az/IF9Wp1bkk3vpT2XSJ76fSDE=
+k8s.io/klog/v2 v2.2.0/go.mod h1:Od+F08eJP+W3HUb4pSrPpgp9DGU4GzlpG/TmITuYh/Y=
+k8s.io/klog/v2 v2.4.0/go.mod h1:Od+F08eJP+W3HUb4pSrPpgp9DGU4GzlpG/TmITuYh/Y=
+k8s.io/klog/v2 v2.8.0 h1:Q3gmuM9hKEjefWFFYF0Mat+YyFJvsUyYuwyNNJ5C9Ts=
+k8s.io/klog/v2 v2.8.0/go.mod h1:hy9LJ/NvuK+iVyP4Ehqva4HxZG/oXyIS3n3Jmire4Ec=
+k8s.io/kube-openapi v0.0.0-20201113171705-d219536bb9fd/go.mod h1:WOJ3KddDSol4tAGcJo0Tvi+dK12EcqSLqcWsryKMpfM=
+k8s.io/kube-openapi v0.0.0-20210305001622-591a79e4bda7 h1:vEx13qjvaZ4yfObSSXW7BrMc/KQBBT/Jyee8XtLf4x0=
+k8s.io/kube-openapi v0.0.0-20210305001622-591a79e4bda7/go.mod h1:wXW5VT87nVfh/iLV8FpR2uDvrFyomxbtb1KivDbvPTE=
+k8s.io/kubectl v0.20.5 h1:/wndy8hw5TsL8G8KWPDJrtPKS8D34uSdWS0BMRmtzWs=
+k8s.io/kubectl v0.20.5/go.mod h1:mlNQgyV18D4XFt5BmfSkrxQNS+arT2pXDQxxnH5lMiw=
+k8s.io/metrics v0.20.5/go.mod h1:vsptOayjKWKWHvWR1vFQY++vxydzaEo/2+JC7kSDKPU=
+k8s.io/utils v0.0.0-20201110183641-67b214c5f920 h1:CbnUZsM497iRC5QMVkHwyl8s2tB3g7yaSHkYPkpgelw=
+k8s.io/utils v0.0.0-20201110183641-67b214c5f920/go.mod h1:jPW/WVKK9YHAvNhRxK0md/EJ228hCsBRufyofKtW8HA=
+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
+rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
+sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.0.15 h1:4uqm9Mv+w2MmBYD+F4qf/v6tDFUdPOk29C095RbU5mY=
+sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.0.15/go.mod h1:LEScyzhFmoF5pso/YSeBstl57mOzx9xlU9n85RGrDQg=
+sigs.k8s.io/kustomize v2.0.3+incompatible/go.mod h1:MkjgH3RdOWrievjo6c9T245dYlB5QeXV4WCbnt/PEpU=
+sigs.k8s.io/mdtoc v1.0.1 h1:6ECKhQnbetwZBR6R2IeT2LH+1w+2Zsip0iXjikgaXIk=
+sigs.k8s.io/mdtoc v1.0.1/go.mod h1:COYBtOjsaCg7o7SC4eaLwEXPuVRSuiVuLLRrHd7kShw=
+sigs.k8s.io/structured-merge-diff/v4 v4.0.2/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw=
+sigs.k8s.io/structured-merge-diff/v4 v4.1.0 h1:C4r9BgJ98vrKnnVCjwCSXcWjWe0NKcUQkmzDXZXGwH8=
+sigs.k8s.io/structured-merge-diff/v4 v4.1.0/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw=
 sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
 sigs.k8s.io/yaml v1.2.0 h1:kr/MCeFWJWTwyaHoR9c8EjH9OumOmoF9YGiZd7lFm/Q=
 sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=

hack/.spelling_failures

@@ -0,0 +1,6 @@
+BUILD
+CHANGELOG
+OWNERS
+go.mod
+go.sum
+vendor/

hack/kind_config.yaml

@@ -1,5 +1,5 @@
 kind: Cluster
-apiVersion: kind.sigs.k8s.io/v1alpha3
+apiVersion: kind.x-k8s.io/v1alpha4
 nodes:
 - role: control-plane
 - role: worker

hack/tools.go

@@ -0,0 +1,26 @@
+// +build tools
+
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// This package imports things required by build scripts, to force `go mod` to see them as dependencies
+package tools
+
+import (
+	_ "github.com/client9/misspell/cmd/misspell"
+	_ "k8s.io/code-generator"
+	_ "sigs.k8s.io/mdtoc"
+)

hack/update-gofmt.sh

@@ -23,7 +23,7 @@ DESCHEDULER_ROOT=$(dirname "${BASH_SOURCE}")/..
 
 GO_VERSION=($(go version))
 
-if [[ -z $(echo "${GO_VERSION[2]}" | grep -E 'go1.2|go1.3|go1.4|go1.5|go1.6|go1.7|go1.8|go1.9|go1.10|go1.11|go1.12|go1.13') ]]; then
+if [[ -z $(echo "${GO_VERSION[2]}" | grep -E 'go1.14|go1.15|go1.16') ]]; then
   echo "Unknown go version '${GO_VERSION[2]}', skipping gofmt."
   exit 1
 fi

hack/update-toc.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+# Copyright 2021 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+source "$(dirname "${BASH_SOURCE}")/lib/init.sh"
+
+go build -o "${OS_OUTPUT_BINPATH}/mdtoc" "sigs.k8s.io/mdtoc"
+
+${OS_OUTPUT_BINPATH}/mdtoc --inplace README.md

hack/verify-conversions.sh

@@ -0,0 +1,36 @@
+#!/bin/bash
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+source "$(dirname "${BASH_SOURCE}")/lib/init.sh"
+DESCHEDULER_ROOT=$(dirname "${BASH_SOURCE}")/..
+mkdir -p "${DESCHEDULER_ROOT}/_tmp"
+_tmpdir="$(mktemp -d "${DESCHEDULER_ROOT}/_tmp/kube-verify.XXXXXX")"
+
+_deschedulertmp="${_tmpdir}"
+mkdir -p "${_deschedulertmp}"
+
+git archive --format=tar --prefix=descheduler/ "$(git write-tree)" | (cd "${_deschedulertmp}" && tar xf -)
+_deschedulertmp="${_deschedulertmp}/descheduler"
+
+pushd "${_deschedulertmp}" > /dev/null 2>&1
+go build -o "${OS_OUTPUT_BINPATH}/conversion-gen" "k8s.io/code-generator/cmd/conversion-gen"
+
+${OS_OUTPUT_BINPATH}/conversion-gen \
+		--go-header-file "hack/boilerplate/boilerplate.go.txt" \
+		--input-dirs "./pkg/apis/componentconfig/v1alpha1,./pkg/api/v1alpha1" \
+		--output-file-base zz_generated.conversion
+popd > /dev/null 2>&1
+
+pushd "${DESCHEDULER_ROOT}" > /dev/null 2>&1
+if ! _out="$(diff -Naupr pkg/ "${_deschedulertmp}/pkg/")"; then
+    echo "Generated output differs:" >&2
+    echo "${_out}" >&2
+    echo "Generated conversions verify failed. Please run ./hack/update-generated-conversions.sh (and commit the result)"
+    exit 1
+fi
+popd > /dev/null 2>&1
+
+echo "Generated conversions verified."

hack/verify-deep-copies.sh

@@ -0,0 +1,36 @@
+#!/bin/bash
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+source "$(dirname "${BASH_SOURCE}")/lib/init.sh"
+DESCHEDULER_ROOT=$(dirname "${BASH_SOURCE}")/..
+mkdir -p "${DESCHEDULER_ROOT}/_tmp"
+_tmpdir="$(mktemp -d "${DESCHEDULER_ROOT}/_tmp/kube-verify.XXXXXX")"
+
+_deschedulertmp="${_tmpdir}"
+mkdir -p "${_deschedulertmp}"
+
+git archive --format=tar --prefix=descheduler/ "$(git write-tree)" | (cd "${_deschedulertmp}" && tar xf -)
+_deschedulertmp="${_deschedulertmp}/descheduler"
+
+pushd "${_deschedulertmp}" > /dev/null 2>&1
+go build -o "${OS_OUTPUT_BINPATH}/deepcopy-gen" "k8s.io/code-generator/cmd/deepcopy-gen"
+
+${OS_OUTPUT_BINPATH}/deepcopy-gen \
+                --go-header-file "hack/boilerplate/boilerplate.go.txt" \
+                --input-dirs "./pkg/apis/componentconfig,./pkg/apis/componentconfig/v1alpha1,./pkg/api,./pkg/api/v1alpha1" \
+                --output-file-base zz_generated.deepcopy
+popd > /dev/null 2>&1
+
+pushd "${DESCHEDULER_ROOT}" > /dev/null 2>&1
+if ! _out="$(diff -Naupr pkg/ "${_deschedulertmp}/pkg/")"; then
+    echo "Generated deep-copies output differs:" >&2
+    echo "${_out}" >&2
+    echo "Generated deep-copies verify failed. Please run ./hack/update-generated-deep-copies.sh (and commit the result)"
+    exit 1
+fi
+popd > /dev/null 2>&1
+
+echo "Generated deep-copies verified."

hack/verify-gofmt.sh

@@ -23,7 +23,7 @@ DESCHEDULER_ROOT=$(dirname "${BASH_SOURCE}")/..
 
 GO_VERSION=($(go version))
 
-if [[ -z $(echo "${GO_VERSION[2]}" | grep -E 'go1.2|go1.3|go1.4|go1.5|go1.6|go1.7|go1.8|go1.9|go1.10|go1.11|go1.12|go1.13') ]]; then
+if [[ -z $(echo "${GO_VERSION[2]}" | grep -E 'go1.14|go1.15|go1.16') ]]; then
   echo "Unknown go version '${GO_VERSION[2]}', skipping gofmt."
   exit 1
 fi

hack/verify-govet.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+# Copyright 2021 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+source "$(dirname "${BASH_SOURCE}")/lib/init.sh"
+
+go vet ${OS_ROOT}/...

hack/verify-spelling.sh

@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+# Copyright 2018 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This script checks commonly misspelled English words in all files in the
+# working directory by client9/misspell package.
+# Usage: `hack/verify-spelling.sh`.
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+KUBE_ROOT=$(dirname "${BASH_SOURCE[0]}")/..
+export KUBE_ROOT
+source "${KUBE_ROOT}/hack/lib/init.sh"
+
+# Ensure that we find the binaries we build before anything else.
+export GOBIN="${OS_OUTPUT_BINPATH}"
+PATH="${GOBIN}:${PATH}"
+
+# Install tools we need
+pushd "${KUBE_ROOT}" >/dev/null
+  GO111MODULE=on go install github.com/client9/misspell/cmd/misspell
+popd >/dev/null
+
+# Spell checking
+# All the skipping files are defined in hack/.spelling_failures
+skipping_file="${KUBE_ROOT}/hack/.spelling_failures"
+failing_packages=$(sed "s| | -e |g" "${skipping_file}")
+git ls-files | grep -v -e "${failing_packages}" | xargs misspell -i "Creater,creater,ect" -error -o stderr

hack/verify-toc.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+
+# Copyright 2021 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+source "$(dirname "${BASH_SOURCE}")/lib/init.sh"
+
+go build -o "${OS_OUTPUT_BINPATH}/mdtoc" "sigs.k8s.io/mdtoc"
+
+if ! ${OS_OUTPUT_BINPATH}/mdtoc --inplace --dryrun README.md
+then
+  echo "ERROR: Changes detected to table of contents. Run ./hack/update-toc.sh" >&2
+  exit 1
+fi

kubernetes/base/kustomization.yaml

@@ -0,0 +1,6 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - configmap.yaml
+  - rbac.yaml

kubernetes/base/rbac.yaml

@@ -3,7 +3,6 @@ kind: ClusterRole
 apiVersion: rbac.authorization.k8s.io/v1
 metadata:
   name: descheduler-cluster-role
-  namespace: kube-system
 rules:
 - apiGroups: [""]
   resources: ["events"]
@@ -11,12 +10,18 @@ rules:
 - apiGroups: [""]
   resources: ["nodes"]
   verbs: ["get", "watch", "list"]
+- apiGroups: [""]
+  resources: ["namespaces"]
+  verbs: ["get", "list"]
 - apiGroups: [""]
   resources: ["pods"]
   verbs: ["get", "watch", "list", "delete"]
 - apiGroups: [""]
   resources: ["pods/eviction"]
   verbs: ["create"]
+- apiGroups: ["scheduling.k8s.io"]
+  resources: ["priorityclasses"]
+  verbs: ["get", "watch", "list"]
 ---
 apiVersion: v1
 kind: ServiceAccount
@@ -28,7 +33,6 @@ apiVersion: rbac.authorization.k8s.io/v1
 kind: ClusterRoleBinding
 metadata:
   name: descheduler-cluster-role-binding
-  namespace: kube-system
 roleRef:
   apiGroup: rbac.authorization.k8s.io
   kind: ClusterRole

kubernetes/cronjob/cronjob.yaml

@@ -1,5 +1,5 @@
 ---
-apiVersion: batch/v1beta1
+apiVersion: batch/v1  # for k8s version < 1.21.0, use batch/v1beta1
 kind: CronJob
 metadata:
   name: descheduler-cronjob
@@ -16,7 +16,7 @@ spec:
           priorityClassName: system-cluster-critical
           containers:
           - name: descheduler
-            image: us.gcr.io/k8s-artifacts-prod/descheduler/descheduler:v0.10.0
+            image: k8s.gcr.io/descheduler/descheduler:v0.21.0
             volumeMounts:
             - mountPath: /policy-dir
               name: policy-volume
@@ -27,6 +27,18 @@ spec:
               - "/policy-dir/policy.yaml"
               - "--v"
               - "3"
+            resources:
+              requests:
+                cpu: "500m"
+                memory: "256Mi"
+            securityContext:
+              allowPrivilegeEscalation: false
+              capabilities:
+                drop:
+                  - ALL
+              privileged: false
+              readOnlyRootFilesystem: true
+              runAsNonRoot: true
           restartPolicy: "Never"
           serviceAccountName: descheduler-sa
           volumes:

kubernetes/cronjob/kustomization.yaml

@@ -0,0 +1,6 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - ../base
+  - cronjob.yaml

kubernetes/deployment/deployment.yaml

@@ -0,0 +1,54 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: descheduler
+  namespace: kube-system
+  labels:
+    app: descheduler
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: descheduler
+  template:
+    metadata:
+      labels:
+        app: descheduler
+    spec:
+      priorityClassName: system-cluster-critical
+      serviceAccountName: descheduler-sa
+      containers:
+        - name: descheduler
+          image: k8s.gcr.io/descheduler/descheduler:v0.21.0
+          imagePullPolicy: IfNotPresent
+          command:
+            - "/bin/descheduler"
+          args:
+            - "--policy-config-file"
+            - "/policy-dir/policy.yaml"
+            - "--descheduling-interval"
+            - "5m"
+            - "--v"
+            - "3"
+          ports:
+          - containerPort: 10258
+            protocol: TCP
+          resources:
+            requests:
+              cpu: 500m
+              memory: 256Mi
+          securityContext:
+            allowPrivilegeEscalation: false
+            capabilities:
+              drop:
+                - ALL
+            privileged: false
+            readOnlyRootFilesystem: true
+            runAsNonRoot: true
+          volumeMounts:
+            - mountPath: /policy-dir
+              name: policy-volume
+      volumes:
+      - name: policy-volume
+        configMap:
+          name: descheduler-policy-configmap

kubernetes/deployment/kustomization.yaml

@@ -0,0 +1,6 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - ../base
+  - deployment.yaml

kubernetes/job/job.yaml

@@ -14,7 +14,7 @@ spec:
       priorityClassName: system-cluster-critical
       containers:
         - name: descheduler
-          image: us.gcr.io/k8s-artifacts-prod/descheduler/descheduler:v0.10.0
+          image: k8s.gcr.io/descheduler/descheduler:v0.21.0
           volumeMounts:
           - mountPath: /policy-dir
             name: policy-volume
@@ -25,6 +25,18 @@ spec:
             - "/policy-dir/policy.yaml"
             - "--v"
             - "3"
+          resources:
+            requests:
+              cpu: "500m"
+              memory: "256Mi"
+          securityContext:
+            allowPrivilegeEscalation: false
+            capabilities:
+              drop:
+                - ALL
+            privileged: false
+            readOnlyRootFilesystem: true
+            runAsNonRoot: true
       restartPolicy: "Never"
       serviceAccountName: descheduler-sa
       volumes:

kubernetes/job/kustomization.yaml

@@ -0,0 +1,6 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - ../base
+  - job.yaml

metrics/metrics.go

@@ -0,0 +1,72 @@
+/*
+Copyright 2021 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package metrics
+
+import (
+	"sync"
+
+	"k8s.io/component-base/metrics"
+	"k8s.io/component-base/metrics/legacyregistry"
+	"sigs.k8s.io/descheduler/pkg/version"
+)
+
+const (
+	// DeschedulerSubsystem - subsystem name used by descheduler
+	DeschedulerSubsystem = "descheduler"
+)
+
+var (
+	PodsEvicted = metrics.NewCounterVec(
+		&metrics.CounterOpts{
+			Subsystem:      DeschedulerSubsystem,
+			Name:           "pods_evicted",
+			Help:           "Number of evicted pods, by the result, by the strategy, by the namespace. 'failed' result means a pod could not be evicted",
+			StabilityLevel: metrics.ALPHA,
+		}, []string{"result", "strategy", "namespace"})
+
+	buildInfo = metrics.NewGauge(
+		&metrics.GaugeOpts{
+			Subsystem:      DeschedulerSubsystem,
+			Name:           "build_info",
+			Help:           "Build info about descheduler, including Go version, Descheduler version, Git SHA, Git branch",
+			ConstLabels:    map[string]string{"GoVersion": version.Get().GoVersion, "DeschedulerVersion": version.Get().GitVersion, "GitBranch": version.Get().GitBranch, "GitSha1": version.Get().GitSha1},
+			StabilityLevel: metrics.ALPHA,
+		},
+	)
+
+	metricsList = []metrics.Registerable{
+		PodsEvicted,
+		buildInfo,
+	}
+)
+
+var registerMetrics sync.Once
+
+// Register all metrics.
+func Register() {
+	// Register the metrics.
+	registerMetrics.Do(func() {
+		RegisterMetrics(metricsList...)
+	})
+}
+
+// RegisterMetrics registers a list of metrics.
+func RegisterMetrics(extraMetrics ...metrics.Registerable) {
+	for _, metric := range extraMetrics {
+		legacyregistry.MustRegister(metric)
+	}
+}

pkg/api/register.go

@@ -19,8 +19,6 @@ package api
 import (
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/runtime/schema"
-
-	"sigs.k8s.io/descheduler/pkg/descheduler/scheme"
 )
 
 var (
@@ -35,12 +33,6 @@ const GroupName = "descheduler"
 // SchemeGroupVersion is group version used to register these objects
 var SchemeGroupVersion = schema.GroupVersion{Group: GroupName, Version: runtime.APIVersionInternal}
 
-func init() {
-	if err := addKnownTypes(scheme.Scheme); err != nil {
-		panic(err)
-	}
-}
-
 // Kind takes an unqualified kind and returns a Group qualified GroupKind
 func Kind(kind string) schema.GroupKind {
 	return SchemeGroupVersion.WithKind(kind).GroupKind()

pkg/api/types.go

@@ -28,6 +28,21 @@ type DeschedulerPolicy struct {
 
 	// Strategies
 	Strategies StrategyList
+
+	// NodeSelector for a set of nodes to operate over
+	NodeSelector *string
+
+	// EvictLocalStoragePods allows pods using local storage to be evicted.
+	EvictLocalStoragePods *bool
+
+	// EvictSystemCriticalPods allows eviction of pods of any priority (including Kubernetes system pods)
+	EvictSystemCriticalPods *bool
+
+	// IgnorePVCPods prevents pods with PVCs from being evicted.
+	IgnorePVCPods *bool
+
+	// MaxNoOfPodsToEvictPerNode restricts maximum of pods to be evicted per node.
+	MaxNoOfPodsToEvictPerNode *int
 }
 
 type StrategyName string
@@ -41,16 +56,31 @@ type DeschedulerStrategy struct {
 	Weight int
 
 	// Strategy parameters
-	Params StrategyParameters
+	Params *StrategyParameters
 }
 
-// Only one of its members may be specified
+// Namespaces carries a list of included/excluded namespaces
+// for which a given strategy is applicable
+type Namespaces struct {
+	Include []string
+	Exclude []string
+}
+
+// Besides Namespaces only one of its members may be specified
+// TODO(jchaloup): move Namespaces ThresholdPriority and ThresholdPriorityClassName to individual strategies
+//  once the policy version is bumped to v1alpha2
 type StrategyParameters struct {
 	NodeResourceUtilizationThresholds *NodeResourceUtilizationThresholds
 	NodeAffinityType                  []string
 	PodsHavingTooManyRestarts         *PodsHavingTooManyRestarts
-	MaxPodLifeTimeSeconds             *uint
+	PodLifeTime                       *PodLifeTime
 	RemoveDuplicates                  *RemoveDuplicates
+	IncludeSoftConstraints            bool
+	Namespaces                        *Namespaces
+	ThresholdPriority                 *int32
+	ThresholdPriorityClassName        string
+	LabelSelector                     *metav1.LabelSelector
+	NodeFit                           bool
 }
 
 type Percentage float64
@@ -70,3 +100,8 @@ type PodsHavingTooManyRestarts struct {
 type RemoveDuplicates struct {
 	ExcludeOwnerKinds []string
 }
+
+type PodLifeTime struct {
+	MaxPodLifeTimeSeconds *uint
+	PodStatusPhases       []string
+}

pkg/api/v1alpha1/types.go

@@ -28,6 +28,21 @@ type DeschedulerPolicy struct {
 
 	// Strategies
 	Strategies StrategyList `json:"strategies,omitempty"`
+
+	// NodeSelector for a set of nodes to operate over
+	NodeSelector *string `json:"nodeSelector,omitempty"`
+
+	// EvictLocalStoragePods allows pods using local storage to be evicted.
+	EvictLocalStoragePods *bool `json:"evictLocalStoragePods,omitempty"`
+
+	// EvictSystemCriticalPods allows eviction of pods of any priority (including Kubernetes system pods)
+	EvictSystemCriticalPods *bool `json:"evictSystemCriticalPods,omitempty"`
+
+	// IgnorePVCPods prevents pods with PVCs from being evicted.
+	IgnorePVCPods *bool `json:"ignorePvcPods,omitempty"`
+
+	// MaxNoOfPodsToEvictPerNode restricts maximum of pods to be evicted per node.
+	MaxNoOfPodsToEvictPerNode *int `json:"maxNoOfPodsToEvictPerNode,omitempty"`
 }
 
 type StrategyName string
@@ -41,16 +56,29 @@ type DeschedulerStrategy struct {
 	Weight int `json:"weight,omitempty"`
 
 	// Strategy parameters
-	Params StrategyParameters `json:"params,omitempty"`
+	Params *StrategyParameters `json:"params,omitempty"`
 }
 
-// Only one of its members may be specified
+// Namespaces carries a list of included/excluded namespaces
+// for which a given strategy is applicable.
+type Namespaces struct {
+	Include []string `json:"include"`
+	Exclude []string `json:"exclude"`
+}
+
+// Besides Namespaces ThresholdPriority and ThresholdPriorityClassName only one of its members may be specified
 type StrategyParameters struct {
 	NodeResourceUtilizationThresholds *NodeResourceUtilizationThresholds `json:"nodeResourceUtilizationThresholds,omitempty"`
 	NodeAffinityType                  []string                           `json:"nodeAffinityType,omitempty"`
 	PodsHavingTooManyRestarts         *PodsHavingTooManyRestarts         `json:"podsHavingTooManyRestarts,omitempty"`
-	MaxPodLifeTimeSeconds             *uint                              `json:"maxPodLifeTimeSeconds,omitempty"`
+	PodLifeTime                       *PodLifeTime                       `json:"podLifeTime,omitempty"`
 	RemoveDuplicates                  *RemoveDuplicates                  `json:"removeDuplicates,omitempty"`
+	IncludeSoftConstraints            bool                               `json:"includeSoftConstraints"`
+	Namespaces                        *Namespaces                        `json:"namespaces"`
+	ThresholdPriority                 *int32                             `json:"thresholdPriority"`
+	ThresholdPriorityClassName        string                             `json:"thresholdPriorityClassName"`
+	LabelSelector                     *metav1.LabelSelector              `json:"labelSelector"`
+	NodeFit                           bool                               `json:"nodeFit"`
 }
 
 type Percentage float64
@@ -70,3 +98,8 @@ type PodsHavingTooManyRestarts struct {
 type RemoveDuplicates struct {
 	ExcludeOwnerKinds []string `json:"excludeOwnerKinds,omitempty"`
 }
+
+type PodLifeTime struct {
+	MaxPodLifeTimeSeconds *uint    `json:"maxPodLifeTimeSeconds,omitempty"`
+	PodStatusPhases       []string `json:"podStatusPhases,omitempty"`
+}

pkg/api/v1alpha1/zz_generated.conversion.go

@@ -1,7 +1,7 @@
 // +build !ignore_autogenerated
 
 /*
-Copyright 2020 The Kubernetes Authors.
+Copyright 2022 The Kubernetes Authors.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -23,6 +23,7 @@ package v1alpha1
 import (
 	unsafe "unsafe"
 
+	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	conversion "k8s.io/apimachinery/pkg/conversion"
 	runtime "k8s.io/apimachinery/pkg/runtime"
 	api "sigs.k8s.io/descheduler/pkg/api"
@@ -55,6 +56,16 @@ func RegisterConversions(s *runtime.Scheme) error {
 	}); err != nil {
 		return err
 	}
+	if err := s.AddGeneratedConversionFunc((*Namespaces)(nil), (*api.Namespaces)(nil), func(a, b interface{}, scope conversion.Scope) error {
+		return Convert_v1alpha1_Namespaces_To_api_Namespaces(a.(*Namespaces), b.(*api.Namespaces), scope)
+	}); err != nil {
+		return err
+	}
+	if err := s.AddGeneratedConversionFunc((*api.Namespaces)(nil), (*Namespaces)(nil), func(a, b interface{}, scope conversion.Scope) error {
+		return Convert_api_Namespaces_To_v1alpha1_Namespaces(a.(*api.Namespaces), b.(*Namespaces), scope)
+	}); err != nil {
+		return err
+	}
 	if err := s.AddGeneratedConversionFunc((*NodeResourceUtilizationThresholds)(nil), (*api.NodeResourceUtilizationThresholds)(nil), func(a, b interface{}, scope conversion.Scope) error {
 		return Convert_v1alpha1_NodeResourceUtilizationThresholds_To_api_NodeResourceUtilizationThresholds(a.(*NodeResourceUtilizationThresholds), b.(*api.NodeResourceUtilizationThresholds), scope)
 	}); err != nil {
@@ -65,6 +76,16 @@ func RegisterConversions(s *runtime.Scheme) error {
 	}); err != nil {
 		return err
 	}
+	if err := s.AddGeneratedConversionFunc((*PodLifeTime)(nil), (*api.PodLifeTime)(nil), func(a, b interface{}, scope conversion.Scope) error {
+		return Convert_v1alpha1_PodLifeTime_To_api_PodLifeTime(a.(*PodLifeTime), b.(*api.PodLifeTime), scope)
+	}); err != nil {
+		return err
+	}
+	if err := s.AddGeneratedConversionFunc((*api.PodLifeTime)(nil), (*PodLifeTime)(nil), func(a, b interface{}, scope conversion.Scope) error {
+		return Convert_api_PodLifeTime_To_v1alpha1_PodLifeTime(a.(*api.PodLifeTime), b.(*PodLifeTime), scope)
+	}); err != nil {
+		return err
+	}
 	if err := s.AddGeneratedConversionFunc((*PodsHavingTooManyRestarts)(nil), (*api.PodsHavingTooManyRestarts)(nil), func(a, b interface{}, scope conversion.Scope) error {
 		return Convert_v1alpha1_PodsHavingTooManyRestarts_To_api_PodsHavingTooManyRestarts(a.(*PodsHavingTooManyRestarts), b.(*api.PodsHavingTooManyRestarts), scope)
 	}); err != nil {
@@ -100,6 +121,11 @@ func RegisterConversions(s *runtime.Scheme) error {
 
 func autoConvert_v1alpha1_DeschedulerPolicy_To_api_DeschedulerPolicy(in *DeschedulerPolicy, out *api.DeschedulerPolicy, s conversion.Scope) error {
 	out.Strategies = *(*api.StrategyList)(unsafe.Pointer(&in.Strategies))
+	out.NodeSelector = (*string)(unsafe.Pointer(in.NodeSelector))
+	out.EvictLocalStoragePods = (*bool)(unsafe.Pointer(in.EvictLocalStoragePods))
+	out.EvictSystemCriticalPods = (*bool)(unsafe.Pointer(in.EvictSystemCriticalPods))
+	out.IgnorePVCPods = (*bool)(unsafe.Pointer(in.IgnorePVCPods))
+	out.MaxNoOfPodsToEvictPerNode = (*int)(unsafe.Pointer(in.MaxNoOfPodsToEvictPerNode))
 	return nil
 }
 
@@ -110,6 +136,11 @@ func Convert_v1alpha1_DeschedulerPolicy_To_api_DeschedulerPolicy(in *Descheduler
 
 func autoConvert_api_DeschedulerPolicy_To_v1alpha1_DeschedulerPolicy(in *api.DeschedulerPolicy, out *DeschedulerPolicy, s conversion.Scope) error {
 	out.Strategies = *(*StrategyList)(unsafe.Pointer(&in.Strategies))
+	out.NodeSelector = (*string)(unsafe.Pointer(in.NodeSelector))
+	out.EvictLocalStoragePods = (*bool)(unsafe.Pointer(in.EvictLocalStoragePods))
+	out.EvictSystemCriticalPods = (*bool)(unsafe.Pointer(in.EvictSystemCriticalPods))
+	out.IgnorePVCPods = (*bool)(unsafe.Pointer(in.IgnorePVCPods))
+	out.MaxNoOfPodsToEvictPerNode = (*int)(unsafe.Pointer(in.MaxNoOfPodsToEvictPerNode))
 	return nil
 }
 
@@ -121,9 +152,7 @@ func Convert_api_DeschedulerPolicy_To_v1alpha1_DeschedulerPolicy(in *api.Desched
 func autoConvert_v1alpha1_DeschedulerStrategy_To_api_DeschedulerStrategy(in *DeschedulerStrategy, out *api.DeschedulerStrategy, s conversion.Scope) error {
 	out.Enabled = in.Enabled
 	out.Weight = in.Weight
-	if err := Convert_v1alpha1_StrategyParameters_To_api_StrategyParameters(&in.Params, &out.Params, s); err != nil {
-		return err
-	}
+	out.Params = (*api.StrategyParameters)(unsafe.Pointer(in.Params))
 	return nil
 }
 
@@ -135,9 +164,7 @@ func Convert_v1alpha1_DeschedulerStrategy_To_api_DeschedulerStrategy(in *Desched
 func autoConvert_api_DeschedulerStrategy_To_v1alpha1_DeschedulerStrategy(in *api.DeschedulerStrategy, out *DeschedulerStrategy, s conversion.Scope) error {
 	out.Enabled = in.Enabled
 	out.Weight = in.Weight
-	if err := Convert_api_StrategyParameters_To_v1alpha1_StrategyParameters(&in.Params, &out.Params, s); err != nil {
-		return err
-	}
+	out.Params = (*StrategyParameters)(unsafe.Pointer(in.Params))
 	return nil
 }
 
@@ -146,6 +173,28 @@ func Convert_api_DeschedulerStrategy_To_v1alpha1_DeschedulerStrategy(in *api.Des
 	return autoConvert_api_DeschedulerStrategy_To_v1alpha1_DeschedulerStrategy(in, out, s)
 }
 
+func autoConvert_v1alpha1_Namespaces_To_api_Namespaces(in *Namespaces, out *api.Namespaces, s conversion.Scope) error {
+	out.Include = *(*[]string)(unsafe.Pointer(&in.Include))
+	out.Exclude = *(*[]string)(unsafe.Pointer(&in.Exclude))
+	return nil
+}
+
+// Convert_v1alpha1_Namespaces_To_api_Namespaces is an autogenerated conversion function.
+func Convert_v1alpha1_Namespaces_To_api_Namespaces(in *Namespaces, out *api.Namespaces, s conversion.Scope) error {
+	return autoConvert_v1alpha1_Namespaces_To_api_Namespaces(in, out, s)
+}
+
+func autoConvert_api_Namespaces_To_v1alpha1_Namespaces(in *api.Namespaces, out *Namespaces, s conversion.Scope) error {
+	out.Include = *(*[]string)(unsafe.Pointer(&in.Include))
+	out.Exclude = *(*[]string)(unsafe.Pointer(&in.Exclude))
+	return nil
+}
+
+// Convert_api_Namespaces_To_v1alpha1_Namespaces is an autogenerated conversion function.
+func Convert_api_Namespaces_To_v1alpha1_Namespaces(in *api.Namespaces, out *Namespaces, s conversion.Scope) error {
+	return autoConvert_api_Namespaces_To_v1alpha1_Namespaces(in, out, s)
+}
+
 func autoConvert_v1alpha1_NodeResourceUtilizationThresholds_To_api_NodeResourceUtilizationThresholds(in *NodeResourceUtilizationThresholds, out *api.NodeResourceUtilizationThresholds, s conversion.Scope) error {
 	out.Thresholds = *(*api.ResourceThresholds)(unsafe.Pointer(&in.Thresholds))
 	out.TargetThresholds = *(*api.ResourceThresholds)(unsafe.Pointer(&in.TargetThresholds))
@@ -170,6 +219,28 @@ func Convert_api_NodeResourceUtilizationThresholds_To_v1alpha1_NodeResourceUtili
 	return autoConvert_api_NodeResourceUtilizationThresholds_To_v1alpha1_NodeResourceUtilizationThresholds(in, out, s)
 }
 
+func autoConvert_v1alpha1_PodLifeTime_To_api_PodLifeTime(in *PodLifeTime, out *api.PodLifeTime, s conversion.Scope) error {
+	out.MaxPodLifeTimeSeconds = (*uint)(unsafe.Pointer(in.MaxPodLifeTimeSeconds))
+	out.PodStatusPhases = *(*[]string)(unsafe.Pointer(&in.PodStatusPhases))
+	return nil
+}
+
+// Convert_v1alpha1_PodLifeTime_To_api_PodLifeTime is an autogenerated conversion function.
+func Convert_v1alpha1_PodLifeTime_To_api_PodLifeTime(in *PodLifeTime, out *api.PodLifeTime, s conversion.Scope) error {
+	return autoConvert_v1alpha1_PodLifeTime_To_api_PodLifeTime(in, out, s)
+}
+
+func autoConvert_api_PodLifeTime_To_v1alpha1_PodLifeTime(in *api.PodLifeTime, out *PodLifeTime, s conversion.Scope) error {
+	out.MaxPodLifeTimeSeconds = (*uint)(unsafe.Pointer(in.MaxPodLifeTimeSeconds))
+	out.PodStatusPhases = *(*[]string)(unsafe.Pointer(&in.PodStatusPhases))
+	return nil
+}
+
+// Convert_api_PodLifeTime_To_v1alpha1_PodLifeTime is an autogenerated conversion function.
+func Convert_api_PodLifeTime_To_v1alpha1_PodLifeTime(in *api.PodLifeTime, out *PodLifeTime, s conversion.Scope) error {
+	return autoConvert_api_PodLifeTime_To_v1alpha1_PodLifeTime(in, out, s)
+}
+
 func autoConvert_v1alpha1_PodsHavingTooManyRestarts_To_api_PodsHavingTooManyRestarts(in *PodsHavingTooManyRestarts, out *api.PodsHavingTooManyRestarts, s conversion.Scope) error {
 	out.PodRestartThreshold = in.PodRestartThreshold
 	out.IncludingInitContainers = in.IncludingInitContainers
@@ -216,8 +287,14 @@ func autoConvert_v1alpha1_StrategyParameters_To_api_StrategyParameters(in *Strat
 	out.NodeResourceUtilizationThresholds = (*api.NodeResourceUtilizationThresholds)(unsafe.Pointer(in.NodeResourceUtilizationThresholds))
 	out.NodeAffinityType = *(*[]string)(unsafe.Pointer(&in.NodeAffinityType))
 	out.PodsHavingTooManyRestarts = (*api.PodsHavingTooManyRestarts)(unsafe.Pointer(in.PodsHavingTooManyRestarts))
-	out.MaxPodLifeTimeSeconds = (*uint)(unsafe.Pointer(in.MaxPodLifeTimeSeconds))
+	out.PodLifeTime = (*api.PodLifeTime)(unsafe.Pointer(in.PodLifeTime))
 	out.RemoveDuplicates = (*api.RemoveDuplicates)(unsafe.Pointer(in.RemoveDuplicates))
+	out.IncludeSoftConstraints = in.IncludeSoftConstraints
+	out.Namespaces = (*api.Namespaces)(unsafe.Pointer(in.Namespaces))
+	out.ThresholdPriority = (*int32)(unsafe.Pointer(in.ThresholdPriority))
+	out.ThresholdPriorityClassName = in.ThresholdPriorityClassName
+	out.LabelSelector = (*v1.LabelSelector)(unsafe.Pointer(in.LabelSelector))
+	out.NodeFit = in.NodeFit
 	return nil
 }
 
@@ -230,8 +307,14 @@ func autoConvert_api_StrategyParameters_To_v1alpha1_StrategyParameters(in *api.S
 	out.NodeResourceUtilizationThresholds = (*NodeResourceUtilizationThresholds)(unsafe.Pointer(in.NodeResourceUtilizationThresholds))
 	out.NodeAffinityType = *(*[]string)(unsafe.Pointer(&in.NodeAffinityType))
 	out.PodsHavingTooManyRestarts = (*PodsHavingTooManyRestarts)(unsafe.Pointer(in.PodsHavingTooManyRestarts))
-	out.MaxPodLifeTimeSeconds = (*uint)(unsafe.Pointer(in.MaxPodLifeTimeSeconds))
+	out.PodLifeTime = (*PodLifeTime)(unsafe.Pointer(in.PodLifeTime))
 	out.RemoveDuplicates = (*RemoveDuplicates)(unsafe.Pointer(in.RemoveDuplicates))
+	out.IncludeSoftConstraints = in.IncludeSoftConstraints
+	out.Namespaces = (*Namespaces)(unsafe.Pointer(in.Namespaces))
+	out.ThresholdPriority = (*int32)(unsafe.Pointer(in.ThresholdPriority))
+	out.ThresholdPriorityClassName = in.ThresholdPriorityClassName
+	out.LabelSelector = (*v1.LabelSelector)(unsafe.Pointer(in.LabelSelector))
+	out.NodeFit = in.NodeFit
 	return nil
 }
 

pkg/api/v1alpha1/zz_generated.deepcopy.go

@@ -1,7 +1,7 @@
 // +build !ignore_autogenerated
 
 /*
-Copyright 2020 The Kubernetes Authors.
+Copyright 2022 The Kubernetes Authors.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -21,6 +21,7 @@ limitations under the License.
 package v1alpha1
 
 import (
+	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	runtime "k8s.io/apimachinery/pkg/runtime"
 )
 
@@ -35,6 +36,31 @@ func (in *DeschedulerPolicy) DeepCopyInto(out *DeschedulerPolicy) {
 			(*out)[key] = *val.DeepCopy()
 		}
 	}
+	if in.NodeSelector != nil {
+		in, out := &in.NodeSelector, &out.NodeSelector
+		*out = new(string)
+		**out = **in
+	}
+	if in.EvictLocalStoragePods != nil {
+		in, out := &in.EvictLocalStoragePods, &out.EvictLocalStoragePods
+		*out = new(bool)
+		**out = **in
+	}
+	if in.EvictSystemCriticalPods != nil {
+		in, out := &in.EvictSystemCriticalPods, &out.EvictSystemCriticalPods
+		*out = new(bool)
+		**out = **in
+	}
+	if in.IgnorePVCPods != nil {
+		in, out := &in.IgnorePVCPods, &out.IgnorePVCPods
+		*out = new(bool)
+		**out = **in
+	}
+	if in.MaxNoOfPodsToEvictPerNode != nil {
+		in, out := &in.MaxNoOfPodsToEvictPerNode, &out.MaxNoOfPodsToEvictPerNode
+		*out = new(int)
+		**out = **in
+	}
 	return
 }
 
@@ -59,7 +85,11 @@ func (in *DeschedulerPolicy) DeepCopyObject() runtime.Object {
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *DeschedulerStrategy) DeepCopyInto(out *DeschedulerStrategy) {
 	*out = *in
-	in.Params.DeepCopyInto(&out.Params)
+	if in.Params != nil {
+		in, out := &in.Params, &out.Params
+		*out = new(StrategyParameters)
+		(*in).DeepCopyInto(*out)
+	}
 	return
 }
 
@@ -73,6 +103,32 @@ func (in *DeschedulerStrategy) DeepCopy() *DeschedulerStrategy {
 	return out
 }
 
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *Namespaces) DeepCopyInto(out *Namespaces) {
+	*out = *in
+	if in.Include != nil {
+		in, out := &in.Include, &out.Include
+		*out = make([]string, len(*in))
+		copy(*out, *in)
+	}
+	if in.Exclude != nil {
+		in, out := &in.Exclude, &out.Exclude
+		*out = make([]string, len(*in))
+		copy(*out, *in)
+	}
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new Namespaces.
+func (in *Namespaces) DeepCopy() *Namespaces {
+	if in == nil {
+		return nil
+	}
+	out := new(Namespaces)
+	in.DeepCopyInto(out)
+	return out
+}
+
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *NodeResourceUtilizationThresholds) DeepCopyInto(out *NodeResourceUtilizationThresholds) {
 	*out = *in
@@ -103,6 +159,32 @@ func (in *NodeResourceUtilizationThresholds) DeepCopy() *NodeResourceUtilization
 	return out
 }
 
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *PodLifeTime) DeepCopyInto(out *PodLifeTime) {
+	*out = *in
+	if in.MaxPodLifeTimeSeconds != nil {
+		in, out := &in.MaxPodLifeTimeSeconds, &out.MaxPodLifeTimeSeconds
+		*out = new(uint)
+		**out = **in
+	}
+	if in.PodStatusPhases != nil {
+		in, out := &in.PodStatusPhases, &out.PodStatusPhases
+		*out = make([]string, len(*in))
+		copy(*out, *in)
+	}
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new PodLifeTime.
+func (in *PodLifeTime) DeepCopy() *PodLifeTime {
+	if in == nil {
+		return nil
+	}
+	out := new(PodLifeTime)
+	in.DeepCopyInto(out)
+	return out
+}
+
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *PodsHavingTooManyRestarts) DeepCopyInto(out *PodsHavingTooManyRestarts) {
 	*out = *in
@@ -202,16 +284,31 @@ func (in *StrategyParameters) DeepCopyInto(out *StrategyParameters) {
 		*out = new(PodsHavingTooManyRestarts)
 		**out = **in
 	}
-	if in.MaxPodLifeTimeSeconds != nil {
-		in, out := &in.MaxPodLifeTimeSeconds, &out.MaxPodLifeTimeSeconds
-		*out = new(uint)
-		**out = **in
+	if in.PodLifeTime != nil {
+		in, out := &in.PodLifeTime, &out.PodLifeTime
+		*out = new(PodLifeTime)
+		(*in).DeepCopyInto(*out)
 	}
 	if in.RemoveDuplicates != nil {
 		in, out := &in.RemoveDuplicates, &out.RemoveDuplicates
 		*out = new(RemoveDuplicates)
 		(*in).DeepCopyInto(*out)
 	}
+	if in.Namespaces != nil {
+		in, out := &in.Namespaces, &out.Namespaces
+		*out = new(Namespaces)
+		(*in).DeepCopyInto(*out)
+	}
+	if in.ThresholdPriority != nil {
+		in, out := &in.ThresholdPriority, &out.ThresholdPriority
+		*out = new(int32)
+		**out = **in
+	}
+	if in.LabelSelector != nil {
+		in, out := &in.LabelSelector, &out.LabelSelector
+		*out = new(v1.LabelSelector)
+		(*in).DeepCopyInto(*out)
+	}
 	return
 }
 

pkg/api/v1alpha1/zz_generated.defaults.go

@@ -1,7 +1,7 @@
 // +build !ignore_autogenerated
 
 /*
-Copyright 2020 The Kubernetes Authors.
+Copyright 2022 The Kubernetes Authors.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.

pkg/api/zz_generated.deepcopy.go

@@ -1,7 +1,7 @@
 // +build !ignore_autogenerated
 
 /*
-Copyright 2020 The Kubernetes Authors.
+Copyright 2022 The Kubernetes Authors.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -21,6 +21,7 @@ limitations under the License.
 package api
 
 import (
+	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	runtime "k8s.io/apimachinery/pkg/runtime"
 )
 
@@ -35,6 +36,31 @@ func (in *DeschedulerPolicy) DeepCopyInto(out *DeschedulerPolicy) {
 			(*out)[key] = *val.DeepCopy()
 		}
 	}
+	if in.NodeSelector != nil {
+		in, out := &in.NodeSelector, &out.NodeSelector
+		*out = new(string)
+		**out = **in
+	}
+	if in.EvictLocalStoragePods != nil {
+		in, out := &in.EvictLocalStoragePods, &out.EvictLocalStoragePods
+		*out = new(bool)
+		**out = **in
+	}
+	if in.EvictSystemCriticalPods != nil {
+		in, out := &in.EvictSystemCriticalPods, &out.EvictSystemCriticalPods
+		*out = new(bool)
+		**out = **in
+	}
+	if in.IgnorePVCPods != nil {
+		in, out := &in.IgnorePVCPods, &out.IgnorePVCPods
+		*out = new(bool)
+		**out = **in
+	}
+	if in.MaxNoOfPodsToEvictPerNode != nil {
+		in, out := &in.MaxNoOfPodsToEvictPerNode, &out.MaxNoOfPodsToEvictPerNode
+		*out = new(int)
+		**out = **in
+	}
 	return
 }
 
@@ -59,7 +85,11 @@ func (in *DeschedulerPolicy) DeepCopyObject() runtime.Object {
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *DeschedulerStrategy) DeepCopyInto(out *DeschedulerStrategy) {
 	*out = *in
-	in.Params.DeepCopyInto(&out.Params)
+	if in.Params != nil {
+		in, out := &in.Params, &out.Params
+		*out = new(StrategyParameters)
+		(*in).DeepCopyInto(*out)
+	}
 	return
 }
 
@@ -73,6 +103,32 @@ func (in *DeschedulerStrategy) DeepCopy() *DeschedulerStrategy {
 	return out
 }
 
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *Namespaces) DeepCopyInto(out *Namespaces) {
+	*out = *in
+	if in.Include != nil {
+		in, out := &in.Include, &out.Include
+		*out = make([]string, len(*in))
+		copy(*out, *in)
+	}
+	if in.Exclude != nil {
+		in, out := &in.Exclude, &out.Exclude
+		*out = make([]string, len(*in))
+		copy(*out, *in)
+	}
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new Namespaces.
+func (in *Namespaces) DeepCopy() *Namespaces {
+	if in == nil {
+		return nil
+	}
+	out := new(Namespaces)
+	in.DeepCopyInto(out)
+	return out
+}
+
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *NodeResourceUtilizationThresholds) DeepCopyInto(out *NodeResourceUtilizationThresholds) {
 	*out = *in
@@ -103,6 +159,32 @@ func (in *NodeResourceUtilizationThresholds) DeepCopy() *NodeResourceUtilization
 	return out
 }
 
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *PodLifeTime) DeepCopyInto(out *PodLifeTime) {
+	*out = *in
+	if in.MaxPodLifeTimeSeconds != nil {
+		in, out := &in.MaxPodLifeTimeSeconds, &out.MaxPodLifeTimeSeconds
+		*out = new(uint)
+		**out = **in
+	}
+	if in.PodStatusPhases != nil {
+		in, out := &in.PodStatusPhases, &out.PodStatusPhases
+		*out = make([]string, len(*in))
+		copy(*out, *in)
+	}
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new PodLifeTime.
+func (in *PodLifeTime) DeepCopy() *PodLifeTime {
+	if in == nil {
+		return nil
+	}
+	out := new(PodLifeTime)
+	in.DeepCopyInto(out)
+	return out
+}
+
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *PodsHavingTooManyRestarts) DeepCopyInto(out *PodsHavingTooManyRestarts) {
 	*out = *in
@@ -202,16 +284,31 @@ func (in *StrategyParameters) DeepCopyInto(out *StrategyParameters) {
 		*out = new(PodsHavingTooManyRestarts)
 		**out = **in
 	}
-	if in.MaxPodLifeTimeSeconds != nil {
-		in, out := &in.MaxPodLifeTimeSeconds, &out.MaxPodLifeTimeSeconds
-		*out = new(uint)
-		**out = **in
+	if in.PodLifeTime != nil {
+		in, out := &in.PodLifeTime, &out.PodLifeTime
+		*out = new(PodLifeTime)
+		(*in).DeepCopyInto(*out)
 	}
 	if in.RemoveDuplicates != nil {
 		in, out := &in.RemoveDuplicates, &out.RemoveDuplicates
 		*out = new(RemoveDuplicates)
 		(*in).DeepCopyInto(*out)
 	}
+	if in.Namespaces != nil {
+		in, out := &in.Namespaces, &out.Namespaces
+		*out = new(Namespaces)
+		(*in).DeepCopyInto(*out)
+	}
+	if in.ThresholdPriority != nil {
+		in, out := &in.ThresholdPriority, &out.ThresholdPriority
+		*out = new(int32)
+		**out = **in
+	}
+	if in.LabelSelector != nil {
+		in, out := &in.LabelSelector, &out.LabelSelector
+		*out = new(v1.LabelSelector)
+		(*in).DeepCopyInto(*out)
+	}
 	return
 }
 

pkg/apis/componentconfig/register.go

@@ -19,8 +19,6 @@ package componentconfig
 import (
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/runtime/schema"
-
-	"sigs.k8s.io/descheduler/pkg/descheduler/scheme"
 )
 
 var (
@@ -34,12 +32,6 @@ const GroupName = "deschedulercomponentconfig"
 // SchemeGroupVersion is group version used to register these objects
 var SchemeGroupVersion = schema.GroupVersion{Group: GroupName, Version: runtime.APIVersionInternal}
 
-func init() {
-	if err := addKnownTypes(scheme.Scheme); err != nil {
-		panic(err)
-	}
-}
-
 // Kind takes an unqualified kind and returns a Group qualified GroupKind
 func Kind(kind string) schema.GroupKind {
 	return SchemeGroupVersion.WithKind(kind).GroupKind()

pkg/apis/componentconfig/types.go

@@ -20,6 +20,7 @@ import (
 	"time"
 
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	componentbaseconfig "k8s.io/component-base/config"
 )
 
 // +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
@@ -48,4 +49,11 @@ type DeschedulerConfiguration struct {
 
 	// EvictLocalStoragePods allows pods using local storage to be evicted.
 	EvictLocalStoragePods bool
+
+	// IgnorePVCPods sets whether PVC pods should be allowed to be evicted
+	IgnorePVCPods bool
+
+	// Logging specifies the options of logging.
+	// Refer [Logs Options](https://github.com/kubernetes/component-base/blob/master/logs/options.go) for more information.
+	Logging componentbaseconfig.LoggingConfiguration
 }

pkg/apis/componentconfig/v1alpha1/types.go

@@ -17,6 +17,7 @@ limitations under the License.
 package v1alpha1
 
 import (
+	componentbaseconfig "k8s.io/component-base/config"
 	"time"
 
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -48,4 +49,11 @@ type DeschedulerConfiguration struct {
 
 	// EvictLocalStoragePods allows pods using local storage to be evicted.
 	EvictLocalStoragePods bool `json:"evictLocalStoragePods,omitempty"`
+
+	// IgnorePVCPods sets whether PVC pods should be allowed to be evicted
+	IgnorePVCPods bool `json:"ignorePvcPods,omitempty"`
+
+	// Logging specifies the options of logging.
+	// Refer [Logs Options](https://github.com/kubernetes/component-base/blob/master/logs/options.go) for more information.
+	Logging componentbaseconfig.LoggingConfiguration `json:"logging,omitempty"`
 }

pkg/apis/componentconfig/v1alpha1/zz_generated.conversion.go

@@ -1,7 +1,7 @@
 // +build !ignore_autogenerated
 
 /*
-Copyright 2020 The Kubernetes Authors.
+Copyright 2022 The Kubernetes Authors.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -56,6 +56,8 @@ func autoConvert_v1alpha1_DeschedulerConfiguration_To_componentconfig_Deschedule
 	out.NodeSelector = in.NodeSelector
 	out.MaxNoOfPodsToEvictPerNode = in.MaxNoOfPodsToEvictPerNode
 	out.EvictLocalStoragePods = in.EvictLocalStoragePods
+	out.IgnorePVCPods = in.IgnorePVCPods
+	out.Logging = in.Logging
 	return nil
 }
 
@@ -72,6 +74,8 @@ func autoConvert_componentconfig_DeschedulerConfiguration_To_v1alpha1_Deschedule
 	out.NodeSelector = in.NodeSelector
 	out.MaxNoOfPodsToEvictPerNode = in.MaxNoOfPodsToEvictPerNode
 	out.EvictLocalStoragePods = in.EvictLocalStoragePods
+	out.IgnorePVCPods = in.IgnorePVCPods
+	out.Logging = in.Logging
 	return nil
 }
 

pkg/apis/componentconfig/v1alpha1/zz_generated.deepcopy.go

@@ -1,7 +1,7 @@
 // +build !ignore_autogenerated
 
 /*
-Copyright 2020 The Kubernetes Authors.
+Copyright 2022 The Kubernetes Authors.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -28,6 +28,7 @@ import (
 func (in *DeschedulerConfiguration) DeepCopyInto(out *DeschedulerConfiguration) {
 	*out = *in
 	out.TypeMeta = in.TypeMeta
+	out.Logging = in.Logging
 	return
 }
 

pkg/apis/componentconfig/v1alpha1/zz_generated.defaults.go

@@ -1,7 +1,7 @@
 // +build !ignore_autogenerated
 
 /*
-Copyright 2020 The Kubernetes Authors.
+Copyright 2022 The Kubernetes Authors.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.

pkg/apis/componentconfig/zz_generated.deepcopy.go

@@ -1,7 +1,7 @@
 // +build !ignore_autogenerated
 
 /*
-Copyright 2020 The Kubernetes Authors.
+Copyright 2022 The Kubernetes Authors.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -28,6 +28,7 @@ import (
 func (in *DeschedulerConfiguration) DeepCopyInto(out *DeschedulerConfiguration) {
 	*out = *in
 	out.TypeMeta = in.TypeMeta
+	out.Logging = in.Logging
 	return
 }
 

pkg/descheduler/descheduler.go

@@ -19,14 +19,16 @@ package descheduler
 import (
 	"context"
 	"fmt"
+	"sigs.k8s.io/descheduler/pkg/descheduler/strategies/nodeutilization"
 
-	"k8s.io/api/core/v1"
+	v1 "k8s.io/api/core/v1"
 	clientset "k8s.io/client-go/kubernetes"
-	"k8s.io/klog"
+	"k8s.io/klog/v2"
 
 	"k8s.io/apimachinery/pkg/util/wait"
 	"k8s.io/client-go/informers"
 	"sigs.k8s.io/descheduler/cmd/descheduler/app/options"
+	"sigs.k8s.io/descheduler/metrics"
 	"sigs.k8s.io/descheduler/pkg/api"
 	"sigs.k8s.io/descheduler/pkg/descheduler/client"
 	"sigs.k8s.io/descheduler/pkg/descheduler/evictions"
@@ -36,6 +38,8 @@ import (
 )
 
 func Run(rs *options.DeschedulerServer) error {
+	metrics.Register()
+
 	ctx := context.Background()
 	rsclient, err := client.CreateClient(rs.KubeconfigFile)
 	if err != nil {
@@ -60,7 +64,7 @@ func Run(rs *options.DeschedulerServer) error {
 	return RunDeschedulerStrategies(ctx, rs, deschedulerPolicy, evictionPolicyGroupVersion, stopChannel)
 }
 
-type strategyFunction func(ctx context.Context, client clientset.Interface, strategy api.DeschedulerStrategy, nodes []*v1.Node, evictLocalStoragePods bool, podEvictor *evictions.PodEvictor)
+type strategyFunction func(ctx context.Context, client clientset.Interface, strategy api.DeschedulerStrategy, nodes []*v1.Node, podEvictor *evictions.PodEvictor)
 
 func RunDeschedulerStrategies(ctx context.Context, rs *options.DeschedulerServer, deschedulerPolicy *api.DeschedulerPolicy, evictionPolicyGroupVersion string, stopChannel chan struct{}) error {
 	sharedInformerFactory := informers.NewSharedInformerFactory(rs.Client, 0)
@@ -69,26 +73,56 @@ func RunDeschedulerStrategies(ctx context.Context, rs *options.DeschedulerServer
 	sharedInformerFactory.Start(stopChannel)
 	sharedInformerFactory.WaitForCacheSync(stopChannel)
 
-	strategyFuncs := map[string]strategyFunction{
-		"RemoveDuplicates":                        strategies.RemoveDuplicatePods,
-		"LowNodeUtilization":                      strategies.LowNodeUtilization,
-		"RemovePodsViolatingInterPodAntiAffinity": strategies.RemovePodsViolatingInterPodAntiAffinity,
-		"RemovePodsViolatingNodeAffinity":         strategies.RemovePodsViolatingNodeAffinity,
-		"RemovePodsViolatingNodeTaints":           strategies.RemovePodsViolatingNodeTaints,
-		"RemovePodsHavingTooManyRestarts":         strategies.RemovePodsHavingTooManyRestarts,
-		"PodLifeTime":                             strategies.PodLifeTime,
+	strategyFuncs := map[api.StrategyName]strategyFunction{
+		"RemoveDuplicates":                            strategies.RemoveDuplicatePods,
+		"LowNodeUtilization":                          nodeutilization.LowNodeUtilization,
+		"HighNodeUtilization":                         nodeutilization.HighNodeUtilization,
+		"RemovePodsViolatingInterPodAntiAffinity":     strategies.RemovePodsViolatingInterPodAntiAffinity,
+		"RemovePodsViolatingNodeAffinity":             strategies.RemovePodsViolatingNodeAffinity,
+		"RemovePodsViolatingNodeTaints":               strategies.RemovePodsViolatingNodeTaints,
+		"RemovePodsHavingTooManyRestarts":             strategies.RemovePodsHavingTooManyRestarts,
+		"PodLifeTime":                                 strategies.PodLifeTime,
+		"RemovePodsViolatingTopologySpreadConstraint": strategies.RemovePodsViolatingTopologySpreadConstraint,
+	}
+
+	nodeSelector := rs.NodeSelector
+	if deschedulerPolicy.NodeSelector != nil {
+		nodeSelector = *deschedulerPolicy.NodeSelector
+	}
+
+	evictLocalStoragePods := rs.EvictLocalStoragePods
+	if deschedulerPolicy.EvictLocalStoragePods != nil {
+		evictLocalStoragePods = *deschedulerPolicy.EvictLocalStoragePods
+	}
+
+	evictSystemCriticalPods := false
+	if deschedulerPolicy.EvictSystemCriticalPods != nil {
+		evictSystemCriticalPods = *deschedulerPolicy.EvictSystemCriticalPods
+		if evictSystemCriticalPods {
+			klog.V(1).InfoS("Warning: EvictSystemCriticalPods is set to True. This could cause eviction of Kubernetes system pods.")
+		}
+	}
+
+	ignorePvcPods := false
+	if deschedulerPolicy.IgnorePVCPods != nil {
+		ignorePvcPods = *deschedulerPolicy.IgnorePVCPods
+	}
+
+	maxNoOfPodsToEvictPerNode := rs.MaxNoOfPodsToEvictPerNode
+	if deschedulerPolicy.MaxNoOfPodsToEvictPerNode != nil {
+		maxNoOfPodsToEvictPerNode = *deschedulerPolicy.MaxNoOfPodsToEvictPerNode
 	}
 
 	wait.Until(func() {
-		nodes, err := nodeutil.ReadyNodes(ctx, rs.Client, nodeInformer, rs.NodeSelector, stopChannel)
+		nodes, err := nodeutil.ReadyNodes(ctx, rs.Client, nodeInformer, nodeSelector)
 		if err != nil {
-			klog.V(1).Infof("Unable to get ready nodes: %v", err)
+			klog.V(1).InfoS("Unable to get ready nodes", "err", err)
 			close(stopChannel)
 			return
 		}
 
 		if len(nodes) <= 1 {
-			klog.V(1).Infof("The cluster size is 0 or 1 meaning eviction causes service disruption or degradation. So aborting..")
+			klog.V(1).InfoS("The cluster size is 0 or 1 meaning eviction causes service disruption or degradation. So aborting..")
 			close(stopChannel)
 			return
 		}
@@ -97,16 +131,25 @@ func RunDeschedulerStrategies(ctx context.Context, rs *options.DeschedulerServer
 			rs.Client,
 			evictionPolicyGroupVersion,
 			rs.DryRun,
-			rs.MaxNoOfPodsToEvictPerNode,
+			maxNoOfPodsToEvictPerNode,
 			nodes,
+			evictLocalStoragePods,
+			evictSystemCriticalPods,
+			ignorePvcPods,
 		)
 
-		for name, f := range strategyFuncs {
-			if strategy := deschedulerPolicy.Strategies[api.StrategyName(name)]; strategy.Enabled {
-				f(ctx, rs.Client, strategy, nodes, rs.EvictLocalStoragePods, podEvictor)
+		for name, strategy := range deschedulerPolicy.Strategies {
+			if f, ok := strategyFuncs[name]; ok {
+				if strategy.Enabled {
+					f(ctx, rs.Client, strategy, nodes, podEvictor)
+				}
+			} else {
+				klog.ErrorS(fmt.Errorf("unknown strategy name"), "skipping strategy", "strategy", name)
 			}
 		}
 
+		klog.V(1).InfoS("Number of evicted pods", "totalEvicted", podEvictor.TotalEvicted())
+
 		// If there was no interval specified, send a signal to the stopChannel to end the wait.Until loop after 1 iteration
 		if rs.DeschedulingInterval.Seconds() == 0 {
 			close(stopChannel)

pkg/descheduler/descheduler_test.go

@@ -7,7 +7,7 @@ import (
 	"testing"
 	"time"
 
-	"k8s.io/api/core/v1"
+	v1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/util/wait"
 	fakeclientset "k8s.io/client-go/kubernetes/fake"
@@ -38,18 +38,27 @@ func TestTaintsUpdated(t *testing.T) {
 	stopChannel := make(chan struct{})
 	defer close(stopChannel)
 
-	rs := options.NewDeschedulerServer()
+	rs, err := options.NewDeschedulerServer()
+	if err != nil {
+		t.Fatalf("Unable to initialize server: %v", err)
+	}
 	rs.Client = client
 	rs.DeschedulingInterval = 100 * time.Millisecond
+	errChan := make(chan error, 1)
+	defer close(errChan)
 	go func() {
 		err := RunDeschedulerStrategies(ctx, rs, dp, "v1beta1", stopChannel)
+		errChan <- err
+	}()
+	select {
+	case err := <-errChan:
 		if err != nil {
 			t.Fatalf("Unable to run descheduler strategies: %v", err)
 		}
-	}()
+	case <-time.After(300 * time.Millisecond):
+		// Wait for few cycles and then verify the only pod still exists
+	}
 
-	// Wait for few cycles and then verify the only pod still exists
-	time.Sleep(300 * time.Millisecond)
 	pods, err := client.CoreV1().Pods(p1.Namespace).List(ctx, metav1.ListOptions{})
 	if err != nil {
 		t.Errorf("Unable to list pods: %v", err)

pkg/descheduler/evictions/evictions.go

@@ -19,37 +19,55 @@ package evictions
 import (
 	"context"
 	"fmt"
+	"strings"
 
 	v1 "k8s.io/api/core/v1"
 	policy "k8s.io/api/policy/v1beta1"
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/labels"
+	"k8s.io/apimachinery/pkg/util/errors"
 	clientset "k8s.io/client-go/kubernetes"
 	"k8s.io/client-go/kubernetes/scheme"
 	clientcorev1 "k8s.io/client-go/kubernetes/typed/core/v1"
 	"k8s.io/client-go/tools/record"
-	"k8s.io/klog"
+	"k8s.io/klog/v2"
+	"sigs.k8s.io/descheduler/metrics"
+	nodeutil "sigs.k8s.io/descheduler/pkg/descheduler/node"
+	podutil "sigs.k8s.io/descheduler/pkg/descheduler/pod"
+	"sigs.k8s.io/descheduler/pkg/utils"
 
 	eutils "sigs.k8s.io/descheduler/pkg/descheduler/evictions/utils"
 )
 
+const (
+	evictPodAnnotationKey = "descheduler.alpha.kubernetes.io/evict"
+)
+
 // nodePodEvictedCount keeps count of pods evicted on node
 type nodePodEvictedCount map[*v1.Node]int
 
 type PodEvictor struct {
-	client             clientset.Interface
-	policyGroupVersion string
-	dryRun             bool
-	maxPodsToEvict     int
-	nodepodCount       nodePodEvictedCount
+	client                  clientset.Interface
+	nodes                   []*v1.Node
+	policyGroupVersion      string
+	dryRun                  bool
+	maxPodsToEvictPerNode   int
+	nodepodCount            nodePodEvictedCount
+	evictLocalStoragePods   bool
+	evictSystemCriticalPods bool
+	ignorePvcPods           bool
 }
 
 func NewPodEvictor(
 	client clientset.Interface,
 	policyGroupVersion string,
 	dryRun bool,
-	maxPodsToEvict int,
+	maxPodsToEvictPerNode int,
 	nodes []*v1.Node,
+	evictLocalStoragePods bool,
+	evictSystemCriticalPods bool,
+	ignorePvcPods bool,
 ) *PodEvictor {
 	var nodePodCount = make(nodePodEvictedCount)
 	for _, node := range nodes {
@@ -58,11 +76,15 @@ func NewPodEvictor(
 	}
 
 	return &PodEvictor{
-		client:             client,
-		policyGroupVersion: policyGroupVersion,
-		dryRun:             dryRun,
-		maxPodsToEvict:     maxPodsToEvict,
-		nodepodCount:       nodePodCount,
+		client:                  client,
+		nodes:                   nodes,
+		policyGroupVersion:      policyGroupVersion,
+		dryRun:                  dryRun,
+		maxPodsToEvictPerNode:   maxPodsToEvictPerNode,
+		nodepodCount:            nodePodCount,
+		evictLocalStoragePods:   evictLocalStoragePods,
+		evictSystemCriticalPods: evictSystemCriticalPods,
+		ignorePvcPods:           ignorePvcPods,
 	}
 }
 
@@ -81,25 +103,37 @@ func (pe *PodEvictor) TotalEvicted() int {
 }
 
 // EvictPod returns non-nil error only when evicting a pod on a node is not
-// possible (due to maxPodsToEvict constraint). Success is true when the pod
+// possible (due to maxPodsToEvictPerNode constraint). Success is true when the pod
 // is evicted on the server side.
-func (pe *PodEvictor) EvictPod(ctx context.Context, pod *v1.Pod, node *v1.Node) (bool, error) {
-	if pe.maxPodsToEvict > 0 && pe.nodepodCount[node]+1 > pe.maxPodsToEvict {
-		return false, fmt.Errorf("Maximum number %v of evicted pods per %q node reached", pe.maxPodsToEvict, node.Name)
+func (pe *PodEvictor) EvictPod(ctx context.Context, pod *v1.Pod, node *v1.Node, strategy string, reasons ...string) (bool, error) {
+	reason := strategy
+	if len(reasons) > 0 {
+		reason += " (" + strings.Join(reasons, ", ") + ")"
+	}
+	if pe.maxPodsToEvictPerNode > 0 && pe.nodepodCount[node]+1 > pe.maxPodsToEvictPerNode {
+		metrics.PodsEvicted.With(map[string]string{"result": "maximum number reached", "strategy": strategy, "namespace": pod.Namespace}).Inc()
+		return false, fmt.Errorf("Maximum number %v of evicted pods per %q node reached", pe.maxPodsToEvictPerNode, node.Name)
 	}
 
 	err := evictPod(ctx, pe.client, pod, pe.policyGroupVersion, pe.dryRun)
 	if err != nil {
 		// err is used only for logging purposes
-		klog.Errorf("Error evicting pod: %#v in namespace %#v (%#v)", pod.Name, pod.Namespace, err)
+		klog.ErrorS(err, "Error evicting pod", "pod", klog.KObj(pod), "reason", reason)
+		metrics.PodsEvicted.With(map[string]string{"result": "error", "strategy": strategy, "namespace": pod.Namespace}).Inc()
 		return false, nil
 	}
 
 	pe.nodepodCount[node]++
 	if pe.dryRun {
-		klog.V(1).Infof("Evicted pod in dry run mode: %#v in namespace %#v", pod.Name, pod.Namespace)
+		klog.V(1).InfoS("Evicted pod in dry run mode", "pod", klog.KObj(pod), "reason", reason)
 	} else {
-		klog.V(1).Infof("Evicted pod: %#v in namespace %#v", pod.Name, pod.Namespace)
+		klog.V(1).InfoS("Evicted pod", "pod", klog.KObj(pod), "reason", reason)
+		eventBroadcaster := record.NewBroadcaster()
+		eventBroadcaster.StartStructuredLogging(3)
+		eventBroadcaster.StartRecordingToSink(&clientcorev1.EventSinkImpl{Interface: pe.client.CoreV1().Events(pod.Namespace)})
+		r := eventBroadcaster.NewRecorder(scheme.Scheme, v1.EventSource{Component: "sigs.k8s.io.descheduler"})
+		r.Event(pod, v1.EventTypeNormal, "Descheduled", fmt.Sprintf("pod evicted by sigs.k8s.io/descheduler%s", reason))
+		metrics.PodsEvicted.With(map[string]string{"result": "success", "strategy": strategy, "namespace": pod.Namespace}).Inc()
 	}
 	return true, nil
 }
@@ -123,14 +157,6 @@ func evictPod(ctx context.Context, client clientset.Interface, pod *v1.Pod, poli
 	}
 	err := client.PolicyV1beta1().Evictions(eviction.Namespace).Evict(ctx, eviction)
 
-	if err == nil {
-		eventBroadcaster := record.NewBroadcaster()
-		eventBroadcaster.StartLogging(klog.V(3).Infof)
-		eventBroadcaster.StartRecordingToSink(&clientcorev1.EventSinkImpl{Interface: client.CoreV1().Events(pod.Namespace)})
-		r := eventBroadcaster.NewRecorder(scheme.Scheme, v1.EventSource{Component: "sigs.k8s.io.descheduler"})
-		r.Event(pod, v1.EventTypeNormal, "Descheduled", "pod evicted by sigs.k8s.io/descheduler")
-		return nil
-	}
 	if apierrors.IsTooManyRequests(err) {
 		return fmt.Errorf("error when evicting pod (ignoring) %q: %v", pod.Name, err)
 	}
@@ -139,3 +165,152 @@ func evictPod(ctx context.Context, client clientset.Interface, pod *v1.Pod, poli
 	}
 	return err
 }
+
+type Options struct {
+	priority      *int32
+	nodeFit       bool
+	labelSelector labels.Selector
+}
+
+// WithPriorityThreshold sets a threshold for pod's priority class.
+// Any pod whose priority class is lower is evictable.
+func WithPriorityThreshold(priority int32) func(opts *Options) {
+	return func(opts *Options) {
+		var p int32 = priority
+		opts.priority = &p
+	}
+}
+
+// WithNodeFit sets whether or not to consider taints, node selectors,
+// and pod affinity when evicting. A pod whose tolerations, node selectors,
+// and affinity match a node other than the one it is currently running on
+// is evictable.
+func WithNodeFit(nodeFit bool) func(opts *Options) {
+	return func(opts *Options) {
+		opts.nodeFit = nodeFit
+	}
+}
+
+// WithLabelSelector sets whether or not to apply label filtering when evicting.
+// Any pod matching the label selector is considered evictable.
+func WithLabelSelector(labelSelector labels.Selector) func(opts *Options) {
+	return func(opts *Options) {
+		opts.labelSelector = labelSelector
+	}
+}
+
+type constraint func(pod *v1.Pod) error
+
+type evictable struct {
+	constraints []constraint
+}
+
+// Evictable provides an implementation of IsEvictable(IsEvictable(pod *v1.Pod) bool).
+// The method accepts a list of options which allow to extend constraints
+// which decides when a pod is considered evictable.
+func (pe *PodEvictor) Evictable(opts ...func(opts *Options)) *evictable {
+	options := &Options{}
+	for _, opt := range opts {
+		opt(options)
+	}
+
+	ev := &evictable{}
+	if !pe.evictSystemCriticalPods {
+		ev.constraints = append(ev.constraints, func(pod *v1.Pod) error {
+			// Moved from IsEvictable function to allow for disabling
+			if utils.IsCriticalPriorityPod(pod) {
+				return fmt.Errorf("pod has system critical priority")
+			}
+			return nil
+		})
+
+		if options.priority != nil {
+			ev.constraints = append(ev.constraints, func(pod *v1.Pod) error {
+				if IsPodEvictableBasedOnPriority(pod, *options.priority) {
+					return nil
+				}
+				return fmt.Errorf("pod has higher priority than specified priority class threshold")
+			})
+		}
+	}
+	if !pe.evictLocalStoragePods {
+		ev.constraints = append(ev.constraints, func(pod *v1.Pod) error {
+			if utils.IsPodWithLocalStorage(pod) {
+				return fmt.Errorf("pod has local storage and descheduler is not configured with evictLocalStoragePods")
+			}
+			return nil
+		})
+	}
+	if pe.ignorePvcPods {
+		ev.constraints = append(ev.constraints, func(pod *v1.Pod) error {
+			if utils.IsPodWithPVC(pod) {
+				return fmt.Errorf("pod has a PVC and descheduler is configured to ignore PVC pods")
+			}
+			return nil
+		})
+	}
+	if options.nodeFit {
+		ev.constraints = append(ev.constraints, func(pod *v1.Pod) error {
+			if !nodeutil.PodFitsAnyOtherNode(pod, pe.nodes) {
+				return fmt.Errorf("pod does not fit on any other node because of nodeSelector(s), Taint(s), or nodes marked as unschedulable")
+			}
+			return nil
+		})
+	}
+	if options.labelSelector != nil && !options.labelSelector.Empty() {
+		ev.constraints = append(ev.constraints, func(pod *v1.Pod) error {
+			if !options.labelSelector.Matches(labels.Set(pod.Labels)) {
+				return fmt.Errorf("pod labels do not match the labelSelector filter in the policy parameter")
+			}
+			return nil
+		})
+	}
+
+	return ev
+}
+
+// IsEvictable decides when a pod is evictable
+func (ev *evictable) IsEvictable(pod *v1.Pod) bool {
+	checkErrs := []error{}
+
+	ownerRefList := podutil.OwnerRef(pod)
+	if utils.IsDaemonsetPod(ownerRefList) {
+		checkErrs = append(checkErrs, fmt.Errorf("pod is a DaemonSet pod"))
+	}
+
+	if len(ownerRefList) == 0 {
+		checkErrs = append(checkErrs, fmt.Errorf("pod does not have any ownerrefs"))
+	}
+
+	if utils.IsMirrorPod(pod) {
+		checkErrs = append(checkErrs, fmt.Errorf("pod is a mirror pod"))
+	}
+
+	if utils.IsStaticPod(pod) {
+		checkErrs = append(checkErrs, fmt.Errorf("pod is a static pod"))
+	}
+
+	for _, c := range ev.constraints {
+		if err := c(pod); err != nil {
+			checkErrs = append(checkErrs, err)
+		}
+	}
+
+	if len(checkErrs) > 0 && !HaveEvictAnnotation(pod) {
+		klog.V(4).InfoS("Pod lacks an eviction annotation and fails the following checks", "pod", klog.KObj(pod), "checks", errors.NewAggregate(checkErrs).Error())
+		return false
+	}
+
+	return true
+}
+
+// HaveEvictAnnotation checks if the pod have evict annotation
+func HaveEvictAnnotation(pod *v1.Pod) bool {
+	_, found := pod.ObjectMeta.Annotations[evictPodAnnotationKey]
+	return found
+}
+
+// IsPodEvictableBasedOnPriority checks if the given pod is evictable based on priority resolved from pod Spec.
+func IsPodEvictableBasedOnPriority(pod *v1.Pod, priority int32) bool {
+	return pod.Spec.Priority == nil || *pod.Spec.Priority < priority
+}

pkg/descheduler/evictions/evictions_test.go

@@ -21,9 +21,12 @@ import (
 	"testing"
 
 	v1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/api/resource"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/client-go/kubernetes/fake"
 	core "k8s.io/client-go/testing"
+	podutil "sigs.k8s.io/descheduler/pkg/descheduler/pod"
+	"sigs.k8s.io/descheduler/pkg/utils"
 	"sigs.k8s.io/descheduler/test"
 )
 
@@ -65,3 +68,416 @@ func TestEvictPod(t *testing.T) {
 		}
 	}
 }
+
+func TestIsEvictable(t *testing.T) {
+	n1 := test.BuildTestNode("node1", 1000, 2000, 13, nil)
+	lowPriority := int32(800)
+	highPriority := int32(900)
+
+	nodeTaintKey := "hardware"
+	nodeTaintValue := "gpu"
+
+	nodeLabelKey := "datacenter"
+	nodeLabelValue := "east"
+	type testCase struct {
+		pod                     *v1.Pod
+		nodes                   []*v1.Node
+		runBefore               func(*v1.Pod, []*v1.Node)
+		evictLocalStoragePods   bool
+		evictSystemCriticalPods bool
+		priorityThreshold       *int32
+		nodeFit                 bool
+		result                  bool
+	}
+
+	testCases := []testCase{
+		{ // Normal pod eviction with normal ownerRefs
+			pod: test.BuildTestPod("p1", 400, 0, n1.Name, nil),
+			runBefore: func(pod *v1.Pod, nodes []*v1.Node) {
+				pod.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
+			},
+			evictLocalStoragePods:   false,
+			evictSystemCriticalPods: false,
+			result:                  true,
+		}, { // Normal pod eviction with normal ownerRefs and descheduler.alpha.kubernetes.io/evict annotation
+			pod: test.BuildTestPod("p2", 400, 0, n1.Name, nil),
+			runBefore: func(pod *v1.Pod, nodes []*v1.Node) {
+				pod.Annotations = map[string]string{"descheduler.alpha.kubernetes.io/evict": "true"}
+				pod.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
+			},
+			evictLocalStoragePods:   false,
+			evictSystemCriticalPods: false,
+			result:                  true,
+		}, { // Normal pod eviction with replicaSet ownerRefs
+			pod: test.BuildTestPod("p3", 400, 0, n1.Name, nil),
+			runBefore: func(pod *v1.Pod, nodes []*v1.Node) {
+				pod.ObjectMeta.OwnerReferences = test.GetReplicaSetOwnerRefList()
+			},
+			evictLocalStoragePods:   false,
+			evictSystemCriticalPods: false,
+			result:                  true,
+		}, { // Normal pod eviction with replicaSet ownerRefs and descheduler.alpha.kubernetes.io/evict annotation
+			pod: test.BuildTestPod("p4", 400, 0, n1.Name, nil),
+			runBefore: func(pod *v1.Pod, nodes []*v1.Node) {
+				pod.Annotations = map[string]string{"descheduler.alpha.kubernetes.io/evict": "true"}
+				pod.ObjectMeta.OwnerReferences = test.GetReplicaSetOwnerRefList()
+			},
+			evictLocalStoragePods:   false,
+			evictSystemCriticalPods: false,
+			result:                  true,
+		}, { // Normal pod eviction with statefulSet ownerRefs
+			pod: test.BuildTestPod("p18", 400, 0, n1.Name, nil),
+			runBefore: func(pod *v1.Pod, nodes []*v1.Node) {
+				pod.ObjectMeta.OwnerReferences = test.GetStatefulSetOwnerRefList()
+			},
+			evictLocalStoragePods:   false,
+			evictSystemCriticalPods: false,
+			result:                  true,
+		}, { // Normal pod eviction with statefulSet ownerRefs and descheduler.alpha.kubernetes.io/evict annotation
+			pod: test.BuildTestPod("p19", 400, 0, n1.Name, nil),
+			runBefore: func(pod *v1.Pod, nodes []*v1.Node) {
+				pod.Annotations = map[string]string{"descheduler.alpha.kubernetes.io/evict": "true"}
+				pod.ObjectMeta.OwnerReferences = test.GetStatefulSetOwnerRefList()
+			},
+			evictLocalStoragePods:   false,
+			evictSystemCriticalPods: false,
+			result:                  true,
+		}, { // Pod not evicted because it is bound to a PV and evictLocalStoragePods = false
+			pod: test.BuildTestPod("p5", 400, 0, n1.Name, nil),
+			runBefore: func(pod *v1.Pod, nodes []*v1.Node) {
+				pod.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
+				pod.Spec.Volumes = []v1.Volume{
+					{
+						Name: "sample",
+						VolumeSource: v1.VolumeSource{
+							HostPath: &v1.HostPathVolumeSource{Path: "somePath"},
+							EmptyDir: &v1.EmptyDirVolumeSource{
+								SizeLimit: resource.NewQuantity(int64(10), resource.BinarySI)},
+						},
+					},
+				}
+			},
+			evictLocalStoragePods:   false,
+			evictSystemCriticalPods: false,
+			result:                  false,
+		}, { // Pod is evicted because it is bound to a PV and evictLocalStoragePods = true
+			pod: test.BuildTestPod("p6", 400, 0, n1.Name, nil),
+			runBefore: func(pod *v1.Pod, nodes []*v1.Node) {
+				pod.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
+				pod.Spec.Volumes = []v1.Volume{
+					{
+						Name: "sample",
+						VolumeSource: v1.VolumeSource{
+							HostPath: &v1.HostPathVolumeSource{Path: "somePath"},
+							EmptyDir: &v1.EmptyDirVolumeSource{
+								SizeLimit: resource.NewQuantity(int64(10), resource.BinarySI)},
+						},
+					},
+				}
+			},
+			evictLocalStoragePods:   true,
+			evictSystemCriticalPods: false,
+			result:                  true,
+		}, { // Pod is evicted because it is bound to a PV and evictLocalStoragePods = false, but it has scheduler.alpha.kubernetes.io/evict annotation
+			pod: test.BuildTestPod("p7", 400, 0, n1.Name, nil),
+			runBefore: func(pod *v1.Pod, nodes []*v1.Node) {
+				pod.Annotations = map[string]string{"descheduler.alpha.kubernetes.io/evict": "true"}
+				pod.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
+				pod.Spec.Volumes = []v1.Volume{
+					{
+						Name: "sample",
+						VolumeSource: v1.VolumeSource{
+							HostPath: &v1.HostPathVolumeSource{Path: "somePath"},
+							EmptyDir: &v1.EmptyDirVolumeSource{
+								SizeLimit: resource.NewQuantity(int64(10), resource.BinarySI)},
+						},
+					},
+				}
+			},
+			evictLocalStoragePods:   false,
+			evictSystemCriticalPods: false,
+			result:                  true,
+		}, { // Pod not evicted becasuse it is part of a daemonSet
+			pod: test.BuildTestPod("p8", 400, 0, n1.Name, nil),
+			runBefore: func(pod *v1.Pod, nodes []*v1.Node) {
+				pod.ObjectMeta.OwnerReferences = test.GetDaemonSetOwnerRefList()
+			},
+			evictLocalStoragePods:   false,
+			evictSystemCriticalPods: false,
+			result:                  false,
+		}, { // Pod is evicted becasuse it is part of a daemonSet, but it has scheduler.alpha.kubernetes.io/evict annotation
+			pod: test.BuildTestPod("p9", 400, 0, n1.Name, nil),
+			runBefore: func(pod *v1.Pod, nodes []*v1.Node) {
+				pod.Annotations = map[string]string{"descheduler.alpha.kubernetes.io/evict": "true"}
+				pod.ObjectMeta.OwnerReferences = test.GetDaemonSetOwnerRefList()
+			},
+			evictLocalStoragePods:   false,
+			evictSystemCriticalPods: false,
+			result:                  true,
+		}, { // Pod not evicted becasuse it is a mirror pod
+			pod: test.BuildTestPod("p10", 400, 0, n1.Name, nil),
+			runBefore: func(pod *v1.Pod, nodes []*v1.Node) {
+				pod.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
+				pod.Annotations = test.GetMirrorPodAnnotation()
+			},
+			evictLocalStoragePods:   false,
+			evictSystemCriticalPods: false,
+			result:                  false,
+		}, { // Pod is evicted becasuse it is a mirror pod, but it has scheduler.alpha.kubernetes.io/evict annotation
+			pod: test.BuildTestPod("p11", 400, 0, n1.Name, nil),
+			runBefore: func(pod *v1.Pod, nodes []*v1.Node) {
+				pod.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
+				pod.Annotations = test.GetMirrorPodAnnotation()
+				pod.Annotations["descheduler.alpha.kubernetes.io/evict"] = "true"
+			},
+			evictLocalStoragePods:   false,
+			evictSystemCriticalPods: false,
+			result:                  true,
+		}, { // Pod not evicted becasuse it has system critical priority
+			pod: test.BuildTestPod("p12", 400, 0, n1.Name, nil),
+			runBefore: func(pod *v1.Pod, nodes []*v1.Node) {
+				pod.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
+				priority := utils.SystemCriticalPriority
+				pod.Spec.Priority = &priority
+			},
+			evictLocalStoragePods:   false,
+			evictSystemCriticalPods: false,
+			result:                  false,
+		}, { // Pod is evicted becasuse it has system critical priority, but it has scheduler.alpha.kubernetes.io/evict annotation
+			pod: test.BuildTestPod("p13", 400, 0, n1.Name, nil),
+			runBefore: func(pod *v1.Pod, nodes []*v1.Node) {
+				pod.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
+				priority := utils.SystemCriticalPriority
+				pod.Spec.Priority = &priority
+				pod.Annotations = map[string]string{
+					"descheduler.alpha.kubernetes.io/evict": "true",
+				}
+			},
+			evictLocalStoragePods:   false,
+			evictSystemCriticalPods: false,
+			result:                  true,
+		}, { // Pod not evicted becasuse it has a priority higher than the configured priority threshold
+			pod: test.BuildTestPod("p14", 400, 0, n1.Name, nil),
+			runBefore: func(pod *v1.Pod, nodes []*v1.Node) {
+				pod.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
+				pod.Spec.Priority = &highPriority
+			},
+			evictLocalStoragePods:   false,
+			evictSystemCriticalPods: false,
+			priorityThreshold:       &lowPriority,
+			result:                  false,
+		}, { // Pod is evicted becasuse it has a priority higher than the configured priority threshold, but it has scheduler.alpha.kubernetes.io/evict annotation
+			pod: test.BuildTestPod("p15", 400, 0, n1.Name, nil),
+			runBefore: func(pod *v1.Pod, nodes []*v1.Node) {
+				pod.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
+				pod.Annotations = map[string]string{"descheduler.alpha.kubernetes.io/evict": "true"}
+				pod.Spec.Priority = &highPriority
+			},
+			evictLocalStoragePods:   false,
+			evictSystemCriticalPods: false,
+			priorityThreshold:       &lowPriority,
+			result:                  true,
+		}, { // Pod is evicted becasuse it has system critical priority, but evictSystemCriticalPods = true
+			pod: test.BuildTestPod("p16", 400, 0, n1.Name, nil),
+			runBefore: func(pod *v1.Pod, nodes []*v1.Node) {
+				pod.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
+				priority := utils.SystemCriticalPriority
+				pod.Spec.Priority = &priority
+			},
+			evictLocalStoragePods:   false,
+			evictSystemCriticalPods: true,
+			result:                  true,
+		}, { // Pod is evicted becasuse it has system critical priority, but evictSystemCriticalPods = true and it has scheduler.alpha.kubernetes.io/evict annotation
+			pod: test.BuildTestPod("p16", 400, 0, n1.Name, nil),
+			runBefore: func(pod *v1.Pod, nodes []*v1.Node) {
+				pod.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
+				pod.Annotations = map[string]string{"descheduler.alpha.kubernetes.io/evict": "true"}
+				priority := utils.SystemCriticalPriority
+				pod.Spec.Priority = &priority
+			},
+			evictLocalStoragePods:   false,
+			evictSystemCriticalPods: true,
+			result:                  true,
+		}, { // Pod is evicted becasuse it has a priority higher than the configured priority threshold, but evictSystemCriticalPods = true
+			pod: test.BuildTestPod("p17", 400, 0, n1.Name, nil),
+			runBefore: func(pod *v1.Pod, nodes []*v1.Node) {
+				pod.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
+				pod.Spec.Priority = &highPriority
+			},
+			evictLocalStoragePods:   false,
+			evictSystemCriticalPods: true,
+			priorityThreshold:       &lowPriority,
+			result:                  true,
+		}, { // Pod is evicted becasuse it has a priority higher than the configured priority threshold, but evictSystemCriticalPods = true and it has scheduler.alpha.kubernetes.io/evict annotation
+			pod: test.BuildTestPod("p17", 400, 0, n1.Name, nil),
+			runBefore: func(pod *v1.Pod, nodes []*v1.Node) {
+				pod.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
+				pod.Annotations = map[string]string{"descheduler.alpha.kubernetes.io/evict": "true"}
+				pod.Spec.Priority = &highPriority
+			},
+			evictLocalStoragePods:   false,
+			evictSystemCriticalPods: true,
+			priorityThreshold:       &lowPriority,
+			result:                  true,
+		}, { // Pod with no tolerations running on normal node, all other nodes tainted
+			pod:   test.BuildTestPod("p1", 400, 0, n1.Name, nil),
+			nodes: []*v1.Node{test.BuildTestNode("node2", 1000, 2000, 13, nil), test.BuildTestNode("node3", 1000, 2000, 13, nil)},
+			runBefore: func(pod *v1.Pod, nodes []*v1.Node) {
+				pod.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
+
+				for _, node := range nodes {
+					node.Spec.Taints = []v1.Taint{
+						{
+							Key:    nodeTaintKey,
+							Value:  nodeTaintValue,
+							Effect: v1.TaintEffectNoSchedule,
+						},
+					}
+				}
+			},
+			evictLocalStoragePods:   false,
+			evictSystemCriticalPods: false,
+			nodeFit:                 true,
+			result:                  false,
+		}, { // Pod with correct tolerations running on normal node, all other nodes tainted
+			pod: test.BuildTestPod("p1", 400, 0, n1.Name, func(pod *v1.Pod) {
+				pod.Spec.Tolerations = []v1.Toleration{
+					{
+						Key:    nodeTaintKey,
+						Value:  nodeTaintValue,
+						Effect: v1.TaintEffectNoSchedule,
+					},
+				}
+			}),
+			nodes: []*v1.Node{test.BuildTestNode("node2", 1000, 2000, 13, nil), test.BuildTestNode("node3", 1000, 2000, 13, nil)},
+			runBefore: func(pod *v1.Pod, nodes []*v1.Node) {
+				pod.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
+
+				for _, node := range nodes {
+					node.Spec.Taints = []v1.Taint{
+						{
+							Key:    nodeTaintKey,
+							Value:  nodeTaintValue,
+							Effect: v1.TaintEffectNoSchedule,
+						},
+					}
+				}
+			},
+			evictLocalStoragePods:   false,
+			evictSystemCriticalPods: false,
+			nodeFit:                 true,
+			result:                  true,
+		}, { // Pod with incorrect node selector
+			pod: test.BuildTestPod("p1", 400, 0, n1.Name, func(pod *v1.Pod) {
+				pod.Spec.NodeSelector = map[string]string{
+					nodeLabelKey: "fail",
+				}
+			}),
+			nodes: []*v1.Node{test.BuildTestNode("node2", 1000, 2000, 13, nil), test.BuildTestNode("node3", 1000, 2000, 13, nil)},
+			runBefore: func(pod *v1.Pod, nodes []*v1.Node) {
+				pod.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
+
+				for _, node := range nodes {
+					node.ObjectMeta.Labels = map[string]string{
+						nodeLabelKey: nodeLabelValue,
+					}
+				}
+			},
+			evictLocalStoragePods:   false,
+			evictSystemCriticalPods: false,
+			nodeFit:                 true,
+			result:                  false,
+		}, { // Pod with correct node selector
+			pod: test.BuildTestPod("p1", 400, 0, n1.Name, func(pod *v1.Pod) {
+				pod.Spec.NodeSelector = map[string]string{
+					nodeLabelKey: nodeLabelValue,
+				}
+			}),
+			nodes: []*v1.Node{test.BuildTestNode("node2", 1000, 2000, 13, nil), test.BuildTestNode("node3", 1000, 2000, 13, nil)},
+			runBefore: func(pod *v1.Pod, nodes []*v1.Node) {
+				pod.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
+
+				for _, node := range nodes {
+					node.ObjectMeta.Labels = map[string]string{
+						nodeLabelKey: nodeLabelValue,
+					}
+				}
+			},
+			evictLocalStoragePods:   false,
+			evictSystemCriticalPods: false,
+			nodeFit:                 true,
+			result:                  true,
+		},
+	}
+
+	for _, test := range testCases {
+		test.runBefore(test.pod, test.nodes)
+		nodes := append(test.nodes, n1)
+
+		podEvictor := &PodEvictor{
+			evictLocalStoragePods:   test.evictLocalStoragePods,
+			evictSystemCriticalPods: test.evictSystemCriticalPods,
+			nodes:                   nodes,
+		}
+
+		evictable := podEvictor.Evictable()
+		var opts []func(opts *Options)
+		if test.priorityThreshold != nil {
+			opts = append(opts, WithPriorityThreshold(*test.priorityThreshold))
+		}
+		if test.nodeFit {
+			opts = append(opts, WithNodeFit(true))
+		}
+		evictable = podEvictor.Evictable(opts...)
+
+		result := evictable.IsEvictable(test.pod)
+		if result != test.result {
+			t.Errorf("IsEvictable should return for pod %s %t, but it returns %t", test.pod.Name, test.result, result)
+		}
+
+	}
+}
+func TestPodTypes(t *testing.T) {
+	n1 := test.BuildTestNode("node1", 1000, 2000, 9, nil)
+	p1 := test.BuildTestPod("p1", 400, 0, n1.Name, nil)
+
+	// These won't be evicted.
+	p2 := test.BuildTestPod("p2", 400, 0, n1.Name, nil)
+	p3 := test.BuildTestPod("p3", 400, 0, n1.Name, nil)
+	p4 := test.BuildTestPod("p4", 400, 0, n1.Name, nil)
+
+	p1.ObjectMeta.OwnerReferences = test.GetReplicaSetOwnerRefList()
+	// The following 4 pods won't get evicted.
+	// A daemonset.
+	//p2.Annotations = test.GetDaemonSetAnnotation()
+	p2.ObjectMeta.OwnerReferences = test.GetDaemonSetOwnerRefList()
+	// A pod with local storage.
+	p3.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
+	p3.Spec.Volumes = []v1.Volume{
+		{
+			Name: "sample",
+			VolumeSource: v1.VolumeSource{
+				HostPath: &v1.HostPathVolumeSource{Path: "somePath"},
+				EmptyDir: &v1.EmptyDirVolumeSource{
+					SizeLimit: resource.NewQuantity(int64(10), resource.BinarySI)},
+			},
+		},
+	}
+	// A Mirror Pod.
+	p4.Annotations = test.GetMirrorPodAnnotation()
+	if !utils.IsMirrorPod(p4) {
+		t.Errorf("Expected p4 to be a mirror pod.")
+	}
+	if !utils.IsPodWithLocalStorage(p3) {
+		t.Errorf("Expected p3 to be a pod with local storage.")
+	}
+	ownerRefList := podutil.OwnerRef(p2)
+	if !utils.IsDaemonsetPod(ownerRefList) {
+		t.Errorf("Expected p2 to be a daemonset pod.")
+	}
+	ownerRefList = podutil.OwnerRef(p1)
+	if utils.IsDaemonsetPod(ownerRefList) || utils.IsPodWithLocalStorage(p1) || utils.IsCriticalPriorityPod(p1) || utils.IsMirrorPod(p1) || utils.IsStaticPod(p1) {
+		t.Errorf("Expected p1 to be a normal pod.")
+	}
+
+}

pkg/descheduler/node/node.go

@@ -18,18 +18,19 @@ package node
 
 import (
 	"context"
-	"k8s.io/api/core/v1"
+
+	v1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/labels"
 	coreinformers "k8s.io/client-go/informers/core/v1"
 	clientset "k8s.io/client-go/kubernetes"
-	"k8s.io/klog"
+	"k8s.io/klog/v2"
 	"sigs.k8s.io/descheduler/pkg/utils"
 )
 
 // ReadyNodes returns ready nodes irrespective of whether they are
 // schedulable or not.
-func ReadyNodes(ctx context.Context, client clientset.Interface, nodeInformer coreinformers.NodeInformer, nodeSelector string, stopChannel <-chan struct{}) ([]*v1.Node, error) {
+func ReadyNodes(ctx context.Context, client clientset.Interface, nodeInformer coreinformers.NodeInformer, nodeSelector string) ([]*v1.Node, error) {
 	ns, err := labels.Parse(nodeSelector)
 	if err != nil {
 		return []*v1.Node{}, err
@@ -42,7 +43,7 @@ func ReadyNodes(ctx context.Context, client clientset.Interface, nodeInformer co
 	}
 
 	if len(nodes) == 0 {
-		klog.V(2).Infof("node lister returned empty list, now fetch directly")
+		klog.V(2).InfoS("Node lister returned empty list, now fetch directly")
 
 		nItems, err := client.CoreV1().Nodes().List(ctx, metav1.ListOptions{LabelSelector: nodeSelector})
 		if err != nil {
@@ -77,25 +78,56 @@ func IsReady(node *v1.Node) bool {
 		// - NodeOutOfDisk condition status is ConditionFalse,
 		// - NodeNetworkUnavailable condition status is ConditionFalse.
 		if cond.Type == v1.NodeReady && cond.Status != v1.ConditionTrue {
-			klog.V(1).Infof("Ignoring node %v with %v condition status %v", node.Name, cond.Type, cond.Status)
+			klog.V(1).InfoS("Ignoring node", "node", klog.KObj(node), "condition", cond.Type, "status", cond.Status)
 			return false
 		} /*else if cond.Type == v1.NodeOutOfDisk && cond.Status != v1.ConditionFalse {
-			klog.V(4).Infof("Ignoring node %v with %v condition status %v", node.Name, cond.Type, cond.Status)
+			klog.V(4).InfoS("Ignoring node with condition status", "node", klog.KObj(node.Name), "condition", cond.Type, "status", cond.Status)
 			return false
 		} else if cond.Type == v1.NodeNetworkUnavailable && cond.Status != v1.ConditionFalse {
-			klog.V(4).Infof("Ignoring node %v with %v condition status %v", node.Name, cond.Type, cond.Status)
+			klog.V(4).InfoS("Ignoring node with condition status", "node", klog.KObj(node.Name), "condition", cond.Type, "status", cond.Status)
 			return false
 		}*/
 	}
 	// Ignore nodes that are marked unschedulable
 	/*if node.Spec.Unschedulable {
-		klog.V(4).Infof("Ignoring node %v since it is unschedulable", node.Name)
+		klog.V(4).InfoS("Ignoring node since it is unschedulable", "node", klog.KObj(node.Name))
 		return false
 	}*/
 	return true
 }
 
-// IsNodeUnschedulable checks if the node is unschedulable. This is helper function to check only in case of
+// PodFitsAnyOtherNode checks if the given pod fits any of the given nodes, besides the node
+// the pod is already running on. The node fit is based on multiple criteria, like, pod node selector
+// matching the node label (including affinity), the taints on the node, and the node being schedulable or not.
+func PodFitsAnyOtherNode(pod *v1.Pod, nodes []*v1.Node) bool {
+
+	for _, node := range nodes {
+		// Skip node pod is already on
+		if node.Name == pod.Spec.NodeName {
+			continue
+		}
+		// Check node selector and required affinity
+		ok, err := utils.PodMatchNodeSelector(pod, node)
+		if err != nil || !ok {
+			continue
+		}
+		// Check taints (we only care about NoSchedule and NoExecute taints)
+		ok = utils.TolerationsTolerateTaintsWithFilter(pod.Spec.Tolerations, node.Spec.Taints, func(taint *v1.Taint) bool {
+			return taint.Effect == v1.TaintEffectNoSchedule || taint.Effect == v1.TaintEffectNoExecute
+		})
+		if !ok {
+			continue
+		}
+		// Check if node is schedulable
+		if !IsNodeUnschedulable(node) {
+			klog.V(2).InfoS("Pod can possibly be scheduled on a different node", "pod", klog.KObj(pod), "node", klog.KObj(node))
+			return true
+		}
+	}
+	return false
+}
+
+// IsNodeUnschedulable checks if the node is unschedulable. This is a helper function to check only in case of
 // underutilized node so that they won't be accounted for.
 func IsNodeUnschedulable(node *v1.Node) bool {
 	return node.Spec.Unschedulable
@@ -112,7 +144,7 @@ func PodFitsAnyNode(pod *v1.Pod, nodes []*v1.Node) bool {
 			continue
 		}
 		if !IsNodeUnschedulable(node) {
-			klog.V(2).Infof("Pod %v can possibly be scheduled on %v", pod.Name, node.Name)
+			klog.V(2).InfoS("Pod can possibly be scheduled on a different node", "pod", klog.KObj(pod), "node", klog.KObj(node))
 			return true
 		}
 	}
@@ -125,15 +157,15 @@ func PodFitsCurrentNode(pod *v1.Pod, node *v1.Node) bool {
 	ok, err := utils.PodMatchNodeSelector(pod, node)
 
 	if err != nil {
-		klog.Error(err)
+		klog.ErrorS(err, "Failed to match node selector")
 		return false
 	}
 
 	if !ok {
-		klog.V(1).Infof("Pod %v does not fit on node %v", pod.Name, node.Name)
+		klog.V(2).InfoS("Pod does not fit on node", "pod", klog.KObj(pod), "node", klog.KObj(node))
 		return false
 	}
 
-	klog.V(3).Infof("Pod %v fits on node %v", pod.Name, node.Name)
+	klog.V(2).InfoS("Pod fits on node", "pod", klog.KObj(pod), "node", klog.KObj(node))
 	return true
 }

pkg/descheduler/node/node_test.go

@@ -20,7 +20,7 @@ import (
 	"context"
 	"testing"
 
-	"k8s.io/api/core/v1"
+	v1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/client-go/informers"
 	"k8s.io/client-go/kubernetes/fake"
@@ -69,12 +69,12 @@ func TestReadyNodesWithNodeSelector(t *testing.T) {
 	sharedInformerFactory := informers.NewSharedInformerFactory(fakeClient, 0)
 	nodeInformer := sharedInformerFactory.Core().V1().Nodes()
 
-	stopChannel := make(chan struct{}, 0)
+	stopChannel := make(chan struct{})
 	sharedInformerFactory.Start(stopChannel)
 	sharedInformerFactory.WaitForCacheSync(stopChannel)
 	defer close(stopChannel)
 
-	nodes, _ := ReadyNodes(ctx, fakeClient, nodeInformer, nodeSelector, nil)
+	nodes, _ := ReadyNodes(ctx, fakeClient, nodeInformer, nodeSelector)
 
 	if nodes[0].Name != "node1" {
 		t.Errorf("Expected node1, got %s", nodes[0].Name)
@@ -200,10 +200,15 @@ func TestPodFitsCurrentNode(t *testing.T) {
 	}
 }
 
-func TestPodFitsAnyNode(t *testing.T) {
+func TestPodFitsAnyOtherNode(t *testing.T) {
 
 	nodeLabelKey := "kubernetes.io/desiredNode"
 	nodeLabelValue := "yes"
+	nodeTaintKey := "hardware"
+	nodeTaintValue := "gpu"
+
+	// Staging node has no scheduling restrictions, but the pod always starts here and PodFitsAnyOtherNode() doesn't take into account the node the pod is running on.
+	nodeNames := []string{"node1", "node2", "stagingNode"}
 
 	tests := []struct {
 		description string
@@ -212,33 +217,12 @@ func TestPodFitsAnyNode(t *testing.T) {
 		success     bool
 	}{
 		{
-			description: "Pod expected to fit one of the nodes",
-			pod: &v1.Pod{
-				Spec: v1.PodSpec{
-					Affinity: &v1.Affinity{
-						NodeAffinity: &v1.NodeAffinity{
-							RequiredDuringSchedulingIgnoredDuringExecution: &v1.NodeSelector{
-								NodeSelectorTerms: []v1.NodeSelectorTerm{
-									{
-										MatchExpressions: []v1.NodeSelectorRequirement{
-											{
-												Key:      nodeLabelKey,
-												Operator: "In",
-												Values: []string{
-													nodeLabelValue,
-												},
-											},
-										},
-									},
-								},
-							},
-						},
-					},
-				},
-			},
+			description: "Pod fits another node matching node affinity",
+			pod:         createPodManifest(nodeNames[2], nodeLabelKey, nodeLabelValue),
 			nodes: []*v1.Node{
 				{
 					ObjectMeta: metav1.ObjectMeta{
+						Name: nodeNames[0],
 						Labels: map[string]string{
 							nodeLabelKey: nodeLabelValue,
 						},
@@ -246,42 +230,27 @@ func TestPodFitsAnyNode(t *testing.T) {
 				},
 				{
 					ObjectMeta: metav1.ObjectMeta{
+						Name: nodeNames[1],
 						Labels: map[string]string{
 							nodeLabelKey: "no",
 						},
 					},
 				},
+				{
+					ObjectMeta: metav1.ObjectMeta{
+						Name: nodeNames[2],
+					},
+				},
 			},
 			success: true,
 		},
 		{
-			description: "Pod expected to fit one of the nodes (error node first)",
-			pod: &v1.Pod{
-				Spec: v1.PodSpec{
-					Affinity: &v1.Affinity{
-						NodeAffinity: &v1.NodeAffinity{
-							RequiredDuringSchedulingIgnoredDuringExecution: &v1.NodeSelector{
-								NodeSelectorTerms: []v1.NodeSelectorTerm{
-									{
-										MatchExpressions: []v1.NodeSelectorRequirement{
-											{
-												Key:      nodeLabelKey,
-												Operator: "In",
-												Values: []string{
-													nodeLabelValue,
-												},
-											},
-										},
-									},
-								},
-							},
-						},
-					},
-				},
-			},
+			description: "Pod expected to fit one of the nodes",
+			pod:         createPodManifest(nodeNames[2], nodeLabelKey, nodeLabelValue),
 			nodes: []*v1.Node{
 				{
 					ObjectMeta: metav1.ObjectMeta{
+						Name: nodeNames[0],
 						Labels: map[string]string{
 							nodeLabelKey: "no",
 						},
@@ -289,42 +258,27 @@ func TestPodFitsAnyNode(t *testing.T) {
 				},
 				{
 					ObjectMeta: metav1.ObjectMeta{
+						Name: nodeNames[1],
 						Labels: map[string]string{
 							nodeLabelKey: nodeLabelValue,
 						},
 					},
 				},
+				{
+					ObjectMeta: metav1.ObjectMeta{
+						Name: nodeNames[2],
+					},
+				},
 			},
 			success: true,
 		},
 		{
 			description: "Pod expected to fit none of the nodes",
-			pod: &v1.Pod{
-				Spec: v1.PodSpec{
-					Affinity: &v1.Affinity{
-						NodeAffinity: &v1.NodeAffinity{
-							RequiredDuringSchedulingIgnoredDuringExecution: &v1.NodeSelector{
-								NodeSelectorTerms: []v1.NodeSelectorTerm{
-									{
-										MatchExpressions: []v1.NodeSelectorRequirement{
-											{
-												Key:      nodeLabelKey,
-												Operator: "In",
-												Values: []string{
-													nodeLabelValue,
-												},
-											},
-										},
-									},
-								},
-							},
-						},
-					},
-				},
-			},
+			pod:         createPodManifest(nodeNames[2], nodeLabelKey, nodeLabelValue),
 			nodes: []*v1.Node{
 				{
 					ObjectMeta: metav1.ObjectMeta{
+						Name: nodeNames[0],
 						Labels: map[string]string{
 							nodeLabelKey: "unfit1",
 						},
@@ -332,42 +286,27 @@ func TestPodFitsAnyNode(t *testing.T) {
 				},
 				{
 					ObjectMeta: metav1.ObjectMeta{
+						Name: nodeNames[1],
 						Labels: map[string]string{
 							nodeLabelKey: "unfit2",
 						},
 					},
 				},
+				{
+					ObjectMeta: metav1.ObjectMeta{
+						Name: nodeNames[2],
+					},
+				},
 			},
 			success: false,
 		},
 		{
 			description: "Nodes are unschedulable but labels match, should fail",
-			pod: &v1.Pod{
-				Spec: v1.PodSpec{
-					Affinity: &v1.Affinity{
-						NodeAffinity: &v1.NodeAffinity{
-							RequiredDuringSchedulingIgnoredDuringExecution: &v1.NodeSelector{
-								NodeSelectorTerms: []v1.NodeSelectorTerm{
-									{
-										MatchExpressions: []v1.NodeSelectorRequirement{
-											{
-												Key:      nodeLabelKey,
-												Operator: "In",
-												Values: []string{
-													nodeLabelValue,
-												},
-											},
-										},
-									},
-								},
-							},
-						},
-					},
-				},
-			},
+			pod:         createPodManifest(nodeNames[2], nodeLabelKey, nodeLabelValue),
 			nodes: []*v1.Node{
 				{
 					ObjectMeta: metav1.ObjectMeta{
+						Name: nodeNames[0],
 						Labels: map[string]string{
 							nodeLabelKey: nodeLabelValue,
 						},
@@ -378,20 +317,136 @@ func TestPodFitsAnyNode(t *testing.T) {
 				},
 				{
 					ObjectMeta: metav1.ObjectMeta{
+						Name: nodeNames[1],
 						Labels: map[string]string{
 							nodeLabelKey: "no",
 						},
 					},
 				},
+				{
+					ObjectMeta: metav1.ObjectMeta{
+						Name: nodeNames[2],
+					},
+				},
+			},
+			success: false,
+		},
+		{
+			description: "Two nodes matches node selector, one of them is tained, should pass",
+			pod:         createPodManifest(nodeNames[2], nodeLabelKey, nodeLabelValue),
+			nodes: []*v1.Node{
+				{
+					ObjectMeta: metav1.ObjectMeta{
+						Name: nodeNames[0],
+						Labels: map[string]string{
+							nodeLabelKey: nodeLabelValue,
+						},
+					},
+					Spec: v1.NodeSpec{
+						Taints: []v1.Taint{
+							{
+								Key:    nodeTaintKey,
+								Value:  nodeTaintValue,
+								Effect: v1.TaintEffectNoSchedule,
+							},
+						},
+					},
+				},
+				{
+					ObjectMeta: metav1.ObjectMeta{
+						Name: nodeNames[1],
+						Labels: map[string]string{
+							nodeLabelKey: nodeLabelValue,
+						},
+					},
+				},
+				{
+					ObjectMeta: metav1.ObjectMeta{
+						Name: nodeNames[2],
+					},
+				},
+			},
+			success: true,
+		},
+		{
+			description: "Both nodes are tained, should fail",
+			pod:         createPodManifest(nodeNames[2], nodeLabelKey, nodeLabelValue),
+			nodes: []*v1.Node{
+				{
+					ObjectMeta: metav1.ObjectMeta{
+						Name: nodeNames[0],
+						Labels: map[string]string{
+							nodeLabelKey: nodeLabelValue,
+						},
+					},
+					Spec: v1.NodeSpec{
+						Taints: []v1.Taint{
+							{
+								Key:    nodeTaintKey,
+								Value:  nodeTaintValue,
+								Effect: v1.TaintEffectNoSchedule,
+							},
+						},
+					},
+				},
+				{
+					ObjectMeta: metav1.ObjectMeta{
+						Name: nodeNames[1],
+						Labels: map[string]string{
+							nodeLabelKey: nodeLabelValue,
+						},
+					},
+					Spec: v1.NodeSpec{
+						Taints: []v1.Taint{
+							{
+								Key:    nodeTaintKey,
+								Value:  nodeTaintValue,
+								Effect: v1.TaintEffectNoExecute,
+							},
+						},
+					},
+				},
+				{
+					ObjectMeta: metav1.ObjectMeta{
+						Name: nodeNames[2],
+					},
+				},
 			},
 			success: false,
 		},
 	}
 
 	for _, tc := range tests {
-		actual := PodFitsAnyNode(tc.pod, tc.nodes)
+		actual := PodFitsAnyOtherNode(tc.pod, tc.nodes)
 		if actual != tc.success {
 			t.Errorf("Test %#v failed", tc.description)
 		}
 	}
 }
+
+func createPodManifest(nodeName string, nodeSelectorKey string, nodeSelectorValue string) *v1.Pod {
+	return (&v1.Pod{
+		Spec: v1.PodSpec{
+			NodeName: nodeName,
+			Affinity: &v1.Affinity{
+				NodeAffinity: &v1.NodeAffinity{
+					RequiredDuringSchedulingIgnoredDuringExecution: &v1.NodeSelector{
+						NodeSelectorTerms: []v1.NodeSelectorTerm{
+							{
+								MatchExpressions: []v1.NodeSelectorRequirement{
+									{
+										Key:      nodeSelectorKey,
+										Operator: "In",
+										Values: []string{
+											nodeSelectorValue,
+										},
+									},
+								},
+							},
+						},
+					},
+				},
+			},
+		},
+	})
+}

pkg/descheduler/pod/pods.go

@@ -18,6 +18,8 @@ package pod
 
 import (
 	"context"
+	"sort"
+
 	v1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/fields"
@@ -25,57 +27,135 @@ import (
 	"sigs.k8s.io/descheduler/pkg/utils"
 )
 
-const (
-	evictPodAnnotationKey = "descheduler.alpha.kubernetes.io/evict"
-)
-
-// IsEvictable checks if a pod is evictable or not.
-func IsEvictable(pod *v1.Pod, evictLocalStoragePods bool) bool {
-	ownerRefList := OwnerRef(pod)
-	if !HaveEvictAnnotation(pod) && (IsMirrorPod(pod) || (!evictLocalStoragePods && IsPodWithLocalStorage(pod)) || len(ownerRefList) == 0 || IsDaemonsetPod(ownerRefList) || IsCriticalPod(pod)) {
-		return false
-	}
-	return true
+type Options struct {
+	filter             func(pod *v1.Pod) bool
+	includedNamespaces []string
+	excludedNamespaces []string
+	labelSelector      *metav1.LabelSelector
 }
 
-// ListEvictablePodsOnNode returns the list of evictable pods on node.
-func ListEvictablePodsOnNode(ctx context.Context, client clientset.Interface, node *v1.Node, evictLocalStoragePods bool) ([]*v1.Pod, error) {
-	pods, err := ListPodsOnANode(ctx, client, node)
-	if err != nil {
-		return []*v1.Pod{}, err
+// WithFilter sets a pod filter.
+// The filter function should return true if the pod should be returned from ListPodsOnANode
+func WithFilter(filter func(pod *v1.Pod) bool) func(opts *Options) {
+	return func(opts *Options) {
+		opts.filter = filter
 	}
-	evictablePods := make([]*v1.Pod, 0)
-	for _, pod := range pods {
-		if !IsEvictable(pod, evictLocalStoragePods) {
-			continue
-		} else {
-			evictablePods = append(evictablePods, pod)
-		}
-	}
-	return evictablePods, nil
 }
 
-func ListPodsOnANode(ctx context.Context, client clientset.Interface, node *v1.Node) ([]*v1.Pod, error) {
-	fieldSelector, err := fields.ParseSelector("spec.nodeName=" + node.Name + ",status.phase!=" + string(v1.PodSucceeded) + ",status.phase!=" + string(v1.PodFailed))
-	if err != nil {
-		return []*v1.Pod{}, err
+// WithNamespaces sets included namespaces
+func WithNamespaces(namespaces []string) func(opts *Options) {
+	return func(opts *Options) {
+		opts.includedNamespaces = namespaces
 	}
+}
 
-	podList, err := client.CoreV1().Pods(v1.NamespaceAll).List(ctx,
-		metav1.ListOptions{FieldSelector: fieldSelector.String()})
-	if err != nil {
-		return []*v1.Pod{}, err
+// WithoutNamespaces sets excluded namespaces
+func WithoutNamespaces(namespaces []string) func(opts *Options) {
+	return func(opts *Options) {
+		opts.excludedNamespaces = namespaces
+	}
+}
+
+// WithLabelSelector sets a pod label selector
+func WithLabelSelector(labelSelector *metav1.LabelSelector) func(opts *Options) {
+	return func(opts *Options) {
+		opts.labelSelector = labelSelector
+	}
+}
+
+// ListPodsOnANode lists all of the pods on a node
+// It also accepts an optional "filter" function which can be used to further limit the pods that are returned.
+// (Usually this is podEvictor.Evictable().IsEvictable, in order to only list the evictable pods on a node, but can
+// be used by strategies to extend it if there are further restrictions, such as with NodeAffinity).
+func ListPodsOnANode(
+	ctx context.Context,
+	client clientset.Interface,
+	node *v1.Node,
+	opts ...func(opts *Options),
+) ([]*v1.Pod, error) {
+	options := &Options{}
+	for _, opt := range opts {
+		opt(options)
 	}
 
 	pods := make([]*v1.Pod, 0)
+
+	fieldSelectorString := "spec.nodeName=" + node.Name + ",status.phase!=" + string(v1.PodSucceeded) + ",status.phase!=" + string(v1.PodFailed)
+
+	labelSelectorString := ""
+	if options.labelSelector != nil {
+		selector, err := metav1.LabelSelectorAsSelector(options.labelSelector)
+		if err != nil {
+			return []*v1.Pod{}, err
+		}
+		labelSelectorString = selector.String()
+	}
+
+	if len(options.includedNamespaces) > 0 {
+		fieldSelector, err := fields.ParseSelector(fieldSelectorString)
+		if err != nil {
+			return []*v1.Pod{}, err
+		}
+
+		for _, namespace := range options.includedNamespaces {
+			podList, err := client.CoreV1().Pods(namespace).List(ctx,
+				metav1.ListOptions{
+					FieldSelector: fieldSelector.String(),
+					LabelSelector: labelSelectorString,
+				})
+			if err != nil {
+				return []*v1.Pod{}, err
+			}
+			for i := range podList.Items {
+				if options.filter != nil && !options.filter(&podList.Items[i]) {
+					continue
+				}
+				pods = append(pods, &podList.Items[i])
+			}
+		}
+		return pods, nil
+	}
+
+	if len(options.excludedNamespaces) > 0 {
+		for _, namespace := range options.excludedNamespaces {
+			fieldSelectorString += ",metadata.namespace!=" + namespace
+		}
+	}
+
+	fieldSelector, err := fields.ParseSelector(fieldSelectorString)
+	if err != nil {
+		return []*v1.Pod{}, err
+	}
+
+	// INFO(jchaloup): field selectors do not work properly with listers
+	// Once the descheduler switches to pod listers (through informers),
+	// We need to flip to client-side filtering.
+	podList, err := client.CoreV1().Pods(v1.NamespaceAll).List(ctx,
+		metav1.ListOptions{
+			FieldSelector: fieldSelector.String(),
+			LabelSelector: labelSelectorString,
+		})
+	if err != nil {
+		return []*v1.Pod{}, err
+	}
+
 	for i := range podList.Items {
+		// fake client does not support field selectors
+		// so let's filter based on the node name as well (quite cheap)
+		if podList.Items[i].Spec.NodeName != node.Name {
+			continue
+		}
+		if options.filter != nil && !options.filter(&podList.Items[i]) {
+			continue
+		}
 		pods = append(pods, &podList.Items[i])
 	}
 	return pods, nil
 }
 
-func IsCriticalPod(pod *v1.Pod) bool {
-	return utils.IsCriticalPod(pod)
+// OwnerRef returns the ownerRefList for the pod.
+func OwnerRef(pod *v1.Pod) []metav1.OwnerReference {
+	return pod.ObjectMeta.GetOwnerReferences()
 }
 
 func IsBestEffortPod(pod *v1.Pod) bool {
@@ -90,37 +170,26 @@ func IsGuaranteedPod(pod *v1.Pod) bool {
 	return utils.GetPodQOS(pod) == v1.PodQOSGuaranteed
 }
 
-func IsDaemonsetPod(ownerRefList []metav1.OwnerReference) bool {
-	for _, ownerRef := range ownerRefList {
-		if ownerRef.Kind == "DaemonSet" {
+// SortPodsBasedOnPriorityLowToHigh sorts pods based on their priorities from low to high.
+// If pods have same priorities, they will be sorted by QoS in the following order:
+// BestEffort, Burstable, Guaranteed
+func SortPodsBasedOnPriorityLowToHigh(pods []*v1.Pod) {
+	sort.Slice(pods, func(i, j int) bool {
+		if pods[i].Spec.Priority == nil && pods[j].Spec.Priority != nil {
 			return true
 		}
-	}
-	return false
-}
-
-// IsMirrorPod checks whether the pod is a mirror pod.
-func IsMirrorPod(pod *v1.Pod) bool {
-	return utils.IsMirrorPod(pod)
-}
-
-// HaveEvictAnnotation checks if the pod have evict annotation
-func HaveEvictAnnotation(pod *v1.Pod) bool {
-	_, found := pod.ObjectMeta.Annotations[evictPodAnnotationKey]
-	return found
-}
-
-func IsPodWithLocalStorage(pod *v1.Pod) bool {
-	for _, volume := range pod.Spec.Volumes {
-		if volume.HostPath != nil || volume.EmptyDir != nil {
-			return true
+		if pods[j].Spec.Priority == nil && pods[i].Spec.Priority != nil {
+			return false
 		}
-	}
-
-	return false
-}
-
-// OwnerRef returns the ownerRefList for the pod.
-func OwnerRef(pod *v1.Pod) []metav1.OwnerReference {
-	return pod.ObjectMeta.GetOwnerReferences()
+		if (pods[j].Spec.Priority == nil && pods[i].Spec.Priority == nil) || (*pods[i].Spec.Priority == *pods[j].Spec.Priority) {
+			if IsBestEffortPod(pods[i]) {
+				return true
+			}
+			if IsBurstablePod(pods[i]) && IsGuaranteedPod(pods[j]) {
+				return true
+			}
+			return false
+		}
+		return *pods[i].Spec.Priority < *pods[j].Spec.Priority
+	})
 }

pkg/descheduler/pod/pods_test.go

@@ -17,221 +17,128 @@ limitations under the License.
 package pod
 
 import (
+	"context"
+	"fmt"
+	"reflect"
+	"strings"
 	"testing"
 
 	v1 "k8s.io/api/core/v1"
-	"k8s.io/apimachinery/pkg/api/resource"
-	"sigs.k8s.io/descheduler/pkg/utils"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/client-go/kubernetes/fake"
+	core "k8s.io/client-go/testing"
 	"sigs.k8s.io/descheduler/test"
 )
 
-func TestIsEvictable(t *testing.T) {
-	n1 := test.BuildTestNode("node1", 1000, 2000, 13, nil)
-	type testCase struct {
-		pod                   *v1.Pod
-		runBefore             func(*v1.Pod)
-		evictLocalStoragePods bool
-		result                bool
-	}
+var (
+	lowPriority  = int32(0)
+	highPriority = int32(10000)
+)
 
-	testCases := []testCase{
+func TestListPodsOnANode(t *testing.T) {
+	testCases := []struct {
+		name             string
+		pods             map[string][]v1.Pod
+		node             *v1.Node
+		labelSelector    *metav1.LabelSelector
+		expectedPodCount int
+	}{
 		{
-			pod: test.BuildTestPod("p1", 400, 0, n1.Name, nil),
-			runBefore: func(pod *v1.Pod) {
-				pod.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
+			name: "test listing pods on a node",
+			pods: map[string][]v1.Pod{
+				"n1": {
+					*test.BuildTestPod("pod1", 100, 0, "n1", nil),
+					*test.BuildTestPod("pod2", 100, 0, "n1", nil),
+				},
+				"n2": {*test.BuildTestPod("pod3", 100, 0, "n2", nil)},
 			},
-			evictLocalStoragePods: false,
-			result:                true,
-		}, {
-			pod: test.BuildTestPod("p2", 400, 0, n1.Name, nil),
-			runBefore: func(pod *v1.Pod) {
-				pod.Annotations = map[string]string{"descheduler.alpha.kubernetes.io/evict": "true"}
-				pod.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
+			node:             test.BuildTestNode("n1", 2000, 3000, 10, nil),
+			labelSelector:    nil,
+			expectedPodCount: 2,
+		},
+		{
+			name: "test listing pods with label selector",
+			pods: map[string][]v1.Pod{
+				"n1": {
+					*test.BuildTestPod("pod1", 100, 0, "n1", nil),
+					*test.BuildTestPod("pod2", 100, 0, "n1", func(pod *v1.Pod) {
+						pod.Labels = map[string]string{"foo": "bar"}
+					}),
+					*test.BuildTestPod("pod3", 100, 0, "n1", func(pod *v1.Pod) {
+						pod.Labels = map[string]string{"foo": "bar1"}
+					}),
+				},
+				"n2": {*test.BuildTestPod("pod4", 100, 0, "n2", nil)},
 			},
-			evictLocalStoragePods: false,
-			result:                true,
-		}, {
-			pod: test.BuildTestPod("p3", 400, 0, n1.Name, nil),
-			runBefore: func(pod *v1.Pod) {
-				pod.ObjectMeta.OwnerReferences = test.GetReplicaSetOwnerRefList()
-			},
-			evictLocalStoragePods: false,
-			result:                true,
-		}, {
-			pod: test.BuildTestPod("p4", 400, 0, n1.Name, nil),
-			runBefore: func(pod *v1.Pod) {
-				pod.Annotations = map[string]string{"descheduler.alpha.kubernetes.io/evict": "true"}
-				pod.ObjectMeta.OwnerReferences = test.GetReplicaSetOwnerRefList()
-			},
-			evictLocalStoragePods: false,
-			result:                true,
-		}, {
-			pod: test.BuildTestPod("p5", 400, 0, n1.Name, nil),
-			runBefore: func(pod *v1.Pod) {
-				pod.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
-				pod.Spec.Volumes = []v1.Volume{
+			node: test.BuildTestNode("n1", 2000, 3000, 10, nil),
+			labelSelector: &metav1.LabelSelector{
+				MatchExpressions: []metav1.LabelSelectorRequirement{
 					{
-						Name: "sample",
-						VolumeSource: v1.VolumeSource{
-							HostPath: &v1.HostPathVolumeSource{Path: "somePath"},
-							EmptyDir: &v1.EmptyDirVolumeSource{
-								SizeLimit: resource.NewQuantity(int64(10), resource.BinarySI)},
-						},
+						Key:      "foo",
+						Operator: metav1.LabelSelectorOpIn,
+						Values:   []string{"bar", "bar1"},
 					},
-				}
+				},
 			},
-			evictLocalStoragePods: false,
-			result:                false,
-		}, {
-			pod: test.BuildTestPod("p6", 400, 0, n1.Name, nil),
-			runBefore: func(pod *v1.Pod) {
-				pod.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
-				pod.Spec.Volumes = []v1.Volume{
-					{
-						Name: "sample",
-						VolumeSource: v1.VolumeSource{
-							HostPath: &v1.HostPathVolumeSource{Path: "somePath"},
-							EmptyDir: &v1.EmptyDirVolumeSource{
-								SizeLimit: resource.NewQuantity(int64(10), resource.BinarySI)},
-						},
-					},
-				}
-			},
-			evictLocalStoragePods: true,
-			result:                true,
-		}, {
-			pod: test.BuildTestPod("p7", 400, 0, n1.Name, nil),
-			runBefore: func(pod *v1.Pod) {
-				pod.Annotations = map[string]string{"descheduler.alpha.kubernetes.io/evict": "true"}
-				pod.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
-				pod.Spec.Volumes = []v1.Volume{
-					{
-						Name: "sample",
-						VolumeSource: v1.VolumeSource{
-							HostPath: &v1.HostPathVolumeSource{Path: "somePath"},
-							EmptyDir: &v1.EmptyDirVolumeSource{
-								SizeLimit: resource.NewQuantity(int64(10), resource.BinarySI)},
-						},
-					},
-				}
-			},
-			evictLocalStoragePods: false,
-			result:                true,
-		}, {
-			pod: test.BuildTestPod("p8", 400, 0, n1.Name, nil),
-			runBefore: func(pod *v1.Pod) {
-				pod.ObjectMeta.OwnerReferences = test.GetDaemonSetOwnerRefList()
-			},
-			evictLocalStoragePods: false,
-			result:                false,
-		}, {
-			pod: test.BuildTestPod("p9", 400, 0, n1.Name, nil),
-			runBefore: func(pod *v1.Pod) {
-				pod.Annotations = map[string]string{"descheduler.alpha.kubernetes.io/evict": "true"}
-				pod.ObjectMeta.OwnerReferences = test.GetDaemonSetOwnerRefList()
-			},
-			evictLocalStoragePods: false,
-			result:                true,
-		}, {
-			pod: test.BuildTestPod("p10", 400, 0, n1.Name, nil),
-			runBefore: func(pod *v1.Pod) {
-				pod.Annotations = test.GetMirrorPodAnnotation()
-			},
-			evictLocalStoragePods: false,
-			result:                false,
-		}, {
-			pod: test.BuildTestPod("p11", 400, 0, n1.Name, nil),
-			runBefore: func(pod *v1.Pod) {
-				pod.Annotations = test.GetMirrorPodAnnotation()
-				pod.Annotations["descheduler.alpha.kubernetes.io/evict"] = "true"
-			},
-			evictLocalStoragePods: false,
-			result:                true,
-		}, {
-			pod: test.BuildTestPod("p12", 400, 0, n1.Name, nil),
-			runBefore: func(pod *v1.Pod) {
-				priority := utils.SystemCriticalPriority
-				pod.Spec.Priority = &priority
-			},
-			evictLocalStoragePods: false,
-			result:                false,
-		}, {
-			pod: test.BuildTestPod("p13", 400, 0, n1.Name, nil),
-			runBefore: func(pod *v1.Pod) {
-				priority := utils.SystemCriticalPriority
-				pod.Spec.Priority = &priority
-				pod.Annotations = map[string]string{
-					"descheduler.alpha.kubernetes.io/evict": "true",
-				}
-			},
-			evictLocalStoragePods: false,
-			result:                true,
+			expectedPodCount: 2,
 		},
 	}
-
-	for _, test := range testCases {
-		test.runBefore(test.pod)
-		result := IsEvictable(test.pod, test.evictLocalStoragePods)
-		if result != test.result {
-			t.Errorf("IsEvictable should return for pod %s %t, but it returns %t", test.pod.Name, test.result, result)
+	for _, testCase := range testCases {
+		fakeClient := &fake.Clientset{}
+		fakeClient.Fake.AddReactor("list", "pods", func(action core.Action) (bool, runtime.Object, error) {
+			list := action.(core.ListAction)
+			fieldString := list.GetListRestrictions().Fields.String()
+			if strings.Contains(fieldString, "n1") {
+				return true, &v1.PodList{Items: testCase.pods["n1"]}, nil
+			} else if strings.Contains(fieldString, "n2") {
+				return true, &v1.PodList{Items: testCase.pods["n2"]}, nil
+			}
+			return true, nil, fmt.Errorf("Failed to list: %v", list)
+		})
+		pods, _ := ListPodsOnANode(context.TODO(), fakeClient, testCase.node, WithLabelSelector(testCase.labelSelector))
+		if len(pods) != testCase.expectedPodCount {
+			t.Errorf("expected %v pods on node %v, got %+v", testCase.expectedPodCount, testCase.node.Name, len(pods))
 		}
-
 	}
 }
-func TestPodTypes(t *testing.T) {
-	n1 := test.BuildTestNode("node1", 1000, 2000, 9, nil)
-	p1 := test.BuildTestPod("p1", 400, 0, n1.Name, nil)
 
-	// These won't be evicted.
-	p2 := test.BuildTestPod("p2", 400, 0, n1.Name, nil)
-	p3 := test.BuildTestPod("p3", 400, 0, n1.Name, nil)
-	p4 := test.BuildTestPod("p4", 400, 0, n1.Name, nil)
-	p5 := test.BuildTestPod("p5", 400, 0, n1.Name, nil)
-	p6 := test.BuildTestPod("p6", 400, 0, n1.Name, nil)
+func TestSortPodsBasedOnPriorityLowToHigh(t *testing.T) {
+	n1 := test.BuildTestNode("n1", 4000, 3000, 9, nil)
 
-	p6.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
+	p1 := test.BuildTestPod("p1", 400, 0, n1.Name, func(pod *v1.Pod) {
+		test.SetPodPriority(pod, lowPriority)
+	})
 
-	p1.ObjectMeta.OwnerReferences = test.GetReplicaSetOwnerRefList()
-	// The following 4 pods won't get evicted.
-	// A daemonset.
-	//p2.Annotations = test.GetDaemonSetAnnotation()
-	p2.ObjectMeta.OwnerReferences = test.GetDaemonSetOwnerRefList()
-	// A pod with local storage.
-	p3.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
-	p3.Spec.Volumes = []v1.Volume{
-		{
-			Name: "sample",
-			VolumeSource: v1.VolumeSource{
-				HostPath: &v1.HostPathVolumeSource{Path: "somePath"},
-				EmptyDir: &v1.EmptyDirVolumeSource{
-					SizeLimit: resource.NewQuantity(int64(10), resource.BinarySI)},
-			},
-		},
-	}
-	// A Mirror Pod.
-	p4.Annotations = test.GetMirrorPodAnnotation()
-	// A Critical Pod.
-	p5.Namespace = "kube-system"
-	priority := utils.SystemCriticalPriority
-	p5.Spec.Priority = &priority
-	systemCriticalPriority := utils.SystemCriticalPriority
-	p5.Spec.Priority = &systemCriticalPriority
-	if !IsMirrorPod(p4) {
-		t.Errorf("Expected p4 to be a mirror pod.")
-	}
-	if !IsCriticalPod(p5) {
-		t.Errorf("Expected p5 to be a critical pod.")
-	}
-	if !IsPodWithLocalStorage(p3) {
-		t.Errorf("Expected p3 to be a pod with local storage.")
-	}
-	ownerRefList := OwnerRef(p2)
-	if !IsDaemonsetPod(ownerRefList) {
-		t.Errorf("Expected p2 to be a daemonset pod.")
-	}
-	ownerRefList = OwnerRef(p1)
-	if IsDaemonsetPod(ownerRefList) || IsPodWithLocalStorage(p1) || IsCriticalPod(p1) || IsMirrorPod(p1) {
-		t.Errorf("Expected p1 to be a normal pod.")
-	}
+	// BestEffort
+	p2 := test.BuildTestPod("p2", 400, 0, n1.Name, func(pod *v1.Pod) {
+		test.SetPodPriority(pod, highPriority)
+		test.MakeBestEffortPod(pod)
+	})
 
+	// Burstable
+	p3 := test.BuildTestPod("p3", 400, 0, n1.Name, func(pod *v1.Pod) {
+		test.SetPodPriority(pod, highPriority)
+		test.MakeBurstablePod(pod)
+	})
+
+	// Guaranteed
+	p4 := test.BuildTestPod("p4", 400, 100, n1.Name, func(pod *v1.Pod) {
+		test.SetPodPriority(pod, highPriority)
+		test.MakeGuaranteedPod(pod)
+	})
+
+	// Best effort with nil priorities.
+	p5 := test.BuildTestPod("p5", 400, 100, n1.Name, test.MakeBestEffortPod)
+	p5.Spec.Priority = nil
+
+	p6 := test.BuildTestPod("p6", 400, 100, n1.Name, test.MakeGuaranteedPod)
+	p6.Spec.Priority = nil
+
+	podList := []*v1.Pod{p4, p3, p2, p1, p6, p5}
+
+	SortPodsBasedOnPriorityLowToHigh(podList)
+	if !reflect.DeepEqual(podList[len(podList)-1], p4) {
+		t.Errorf("Expected last pod in sorted list to be %v which of highest priority and guaranteed but got %v", p4, podList[len(podList)-1])
+	}
 }

pkg/descheduler/policyconfig.go

@@ -21,7 +21,7 @@ import (
 	"io/ioutil"
 
 	"k8s.io/apimachinery/pkg/runtime"
-	"k8s.io/klog"
+	"k8s.io/klog/v2"
 
 	"sigs.k8s.io/descheduler/pkg/api"
 	"sigs.k8s.io/descheduler/pkg/api/v1alpha1"
@@ -30,7 +30,7 @@ import (
 
 func LoadPolicyConfig(policyConfigFile string) (*api.DeschedulerPolicy, error) {
 	if policyConfigFile == "" {
-		klog.V(1).Infof("policy config file not specified")
+		klog.V(1).InfoS("Policy config file not specified")
 		return nil, nil
 	}
 

pkg/descheduler/scheme/scheme.go

@@ -19,9 +19,22 @@ package scheme
 import (
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/runtime/serializer"
+	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
+	"sigs.k8s.io/descheduler/pkg/api"
+	"sigs.k8s.io/descheduler/pkg/api/v1alpha1"
+	"sigs.k8s.io/descheduler/pkg/apis/componentconfig"
+	componentconfigv1alpha1 "sigs.k8s.io/descheduler/pkg/apis/componentconfig/v1alpha1"
 )
 
 var (
 	Scheme = runtime.NewScheme()
 	Codecs = serializer.NewCodecFactory(Scheme)
 )
+
+func init() {
+	utilruntime.Must(api.AddToScheme(Scheme))
+	utilruntime.Must(v1alpha1.AddToScheme(Scheme))
+
+	utilruntime.Must(componentconfig.AddToScheme(Scheme))
+	utilruntime.Must(componentconfigv1alpha1.AddToScheme(Scheme))
+}

pkg/descheduler/strategies/duplicates.go

@@ -18,6 +18,8 @@ package strategies
 
 import (
 	"context"
+	"fmt"
+	"math"
 	"reflect"
 	"sort"
 	"strings"
@@ -26,13 +28,34 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/util/sets"
 	clientset "k8s.io/client-go/kubernetes"
-	"k8s.io/klog"
+	"k8s.io/klog/v2"
 
 	"sigs.k8s.io/descheduler/pkg/api"
 	"sigs.k8s.io/descheduler/pkg/descheduler/evictions"
 	podutil "sigs.k8s.io/descheduler/pkg/descheduler/pod"
+	"sigs.k8s.io/descheduler/pkg/utils"
 )
 
+func validateRemoveDuplicatePodsParams(params *api.StrategyParameters) error {
+	if params == nil {
+		return nil
+	}
+	// At most one of include/exclude can be set
+	if params.Namespaces != nil && len(params.Namespaces.Include) > 0 && len(params.Namespaces.Exclude) > 0 {
+		return fmt.Errorf("only one of Include/Exclude namespaces can be set")
+	}
+	if params.ThresholdPriority != nil && params.ThresholdPriorityClassName != "" {
+		return fmt.Errorf("only one of thresholdPriority and thresholdPriorityClassName can be set")
+	}
+
+	return nil
+}
+
+type podOwner struct {
+	namespace, kind, name string
+	imagesHash            string
+}
+
 // RemoveDuplicatePods removes the duplicate pods on node. This strategy evicts all duplicate pods on node.
 // A pod is said to be a duplicate of other if both of them are from same creator, kind and are within the same
 // namespace, and have at least one container with the same image.
@@ -42,81 +65,225 @@ func RemoveDuplicatePods(
 	client clientset.Interface,
 	strategy api.DeschedulerStrategy,
 	nodes []*v1.Node,
-	evictLocalStoragePods bool,
 	podEvictor *evictions.PodEvictor,
 ) {
+	if err := validateRemoveDuplicatePodsParams(strategy.Params); err != nil {
+		klog.ErrorS(err, "Invalid RemoveDuplicatePods parameters")
+		return
+	}
+	thresholdPriority, err := utils.GetPriorityFromStrategyParams(ctx, client, strategy.Params)
+	if err != nil {
+		klog.ErrorS(err, "Failed to get threshold priority from strategy's params")
+		return
+	}
+
+	var includedNamespaces, excludedNamespaces []string
+	if strategy.Params != nil && strategy.Params.Namespaces != nil {
+		includedNamespaces = strategy.Params.Namespaces.Include
+		excludedNamespaces = strategy.Params.Namespaces.Exclude
+	}
+
+	nodeFit := false
+	if strategy.Params != nil {
+		nodeFit = strategy.Params.NodeFit
+	}
+
+	evictable := podEvictor.Evictable(evictions.WithPriorityThreshold(thresholdPriority), evictions.WithNodeFit(nodeFit))
+
+	duplicatePods := make(map[podOwner]map[string][]*v1.Pod)
+	ownerKeyOccurence := make(map[podOwner]int32)
+	nodeCount := 0
+	nodeMap := make(map[string]*v1.Node)
+
 	for _, node := range nodes {
-		klog.V(1).Infof("Processing node: %#v", node.Name)
-		duplicatePods := listDuplicatePodsOnANode(ctx, client, node, strategy, evictLocalStoragePods)
-		for _, pod := range duplicatePods {
-			if _, err := podEvictor.EvictPod(ctx, pod, node); err != nil {
-				klog.Errorf("Error evicting pod: (%#v)", err)
-				break
+		klog.V(1).InfoS("Processing node", "node", klog.KObj(node))
+		pods, err := podutil.ListPodsOnANode(ctx,
+			client,
+			node,
+			podutil.WithFilter(evictable.IsEvictable),
+			podutil.WithNamespaces(includedNamespaces),
+			podutil.WithoutNamespaces(excludedNamespaces),
+		)
+		if err != nil {
+			klog.ErrorS(err, "Error listing evictable pods on node", "node", klog.KObj(node))
+			continue
+		}
+		nodeMap[node.Name] = node
+		nodeCount++
+		// Each pod has a list of owners and a list of containers, and each container has 1 image spec.
+		// For each pod, we go through all the OwnerRef/Image mappings and represent them as a "key" string.
+		// All of those mappings together makes a list of "key" strings that essentially represent that pod's uniqueness.
+		// This list of keys representing a single pod is then sorted alphabetically.
+		// If any other pod has a list that matches that pod's list, those pods are undeniably duplicates for the following reasons:
+		//   - The 2 pods have the exact same ownerrefs
+		//   - The 2 pods have the exact same container images
+		//
+		// duplicateKeysMap maps the first Namespace/Kind/Name/Image in a pod's list to a 2D-slice of all the other lists where that is the first key
+		// (Since we sort each pod's list, we only need to key the map on the first entry in each list. Any pod that doesn't have
+		// the same first entry is clearly not a duplicate. This makes lookup quick and minimizes storage needed).
+		// If any of the existing lists for that first key matches the current pod's list, the current pod is a duplicate.
+		// If not, then we add this pod's list to the list of lists for that key.
+		duplicateKeysMap := map[string][][]string{}
+		for _, pod := range pods {
+			ownerRefList := podutil.OwnerRef(pod)
+			if hasExcludedOwnerRefKind(ownerRefList, strategy) || len(ownerRefList) == 0 {
+				continue
+			}
+			podContainerKeys := make([]string, 0, len(ownerRefList)*len(pod.Spec.Containers))
+			imageList := []string{}
+			for _, container := range pod.Spec.Containers {
+				imageList = append(imageList, container.Image)
+			}
+			sort.Strings(imageList)
+			imagesHash := strings.Join(imageList, "#")
+			for _, ownerRef := range ownerRefList {
+				ownerKey := podOwner{
+					namespace:  pod.ObjectMeta.Namespace,
+					kind:       ownerRef.Kind,
+					name:       ownerRef.Name,
+					imagesHash: imagesHash,
+				}
+				ownerKeyOccurence[ownerKey] = ownerKeyOccurence[ownerKey] + 1
+				for _, image := range imageList {
+					// Namespace/Kind/Name should be unique for the cluster.
+					// We also consider the image, as 2 pods could have the same owner but serve different purposes
+					// So any non-unique Namespace/Kind/Name/Image pattern is a duplicate pod.
+					s := strings.Join([]string{pod.ObjectMeta.Namespace, ownerRef.Kind, ownerRef.Name, image}, "/")
+					podContainerKeys = append(podContainerKeys, s)
+				}
+			}
+			sort.Strings(podContainerKeys)
+
+			// If there have been any other pods with the same first "key", look through all the lists to see if any match
+			if existing, ok := duplicateKeysMap[podContainerKeys[0]]; ok {
+				matched := false
+				for _, keys := range existing {
+					if reflect.DeepEqual(keys, podContainerKeys) {
+						matched = true
+						klog.V(3).InfoS("Duplicate found", "pod", klog.KObj(pod))
+						for _, ownerRef := range ownerRefList {
+							ownerKey := podOwner{
+								namespace:  pod.ObjectMeta.Namespace,
+								kind:       ownerRef.Kind,
+								name:       ownerRef.Name,
+								imagesHash: imagesHash,
+							}
+							if _, ok := duplicatePods[ownerKey]; !ok {
+								duplicatePods[ownerKey] = make(map[string][]*v1.Pod)
+							}
+							duplicatePods[ownerKey][node.Name] = append(duplicatePods[ownerKey][node.Name], pod)
+						}
+						break
+					}
+				}
+				if !matched {
+					// Found no matches, add this list of keys to the list of lists that have the same first key
+					duplicateKeysMap[podContainerKeys[0]] = append(duplicateKeysMap[podContainerKeys[0]], podContainerKeys)
+				}
+			} else {
+				// This is the first pod we've seen that has this first "key" entry
+				duplicateKeysMap[podContainerKeys[0]] = [][]string{podContainerKeys}
+			}
+		}
+	}
+
+	// 1. how many pods can be evicted to respect uniform placement of pods among viable nodes?
+	for ownerKey, podNodes := range duplicatePods {
+		targetNodes := getTargetNodes(podNodes, nodes)
+
+		klog.V(2).InfoS("Adjusting feasible nodes", "owner", ownerKey, "from", nodeCount, "to", len(targetNodes))
+		if len(targetNodes) < 2 {
+			klog.V(1).InfoS("Less than two feasible nodes for duplicates to land, skipping eviction", "owner", ownerKey)
+			continue
+		}
+
+		upperAvg := int(math.Ceil(float64(ownerKeyOccurence[ownerKey]) / float64(len(targetNodes))))
+		for nodeName, pods := range podNodes {
+			klog.V(2).InfoS("Average occurrence per node", "node", klog.KObj(nodeMap[nodeName]), "ownerKey", ownerKey, "avg", upperAvg)
+			// list of duplicated pods does not contain the original referential pod
+			if len(pods)+1 > upperAvg {
+				// It's assumed all duplicated pods are in the same priority class
+				// TODO(jchaloup): check if the pod has a different node to lend to
+				for _, pod := range pods[upperAvg-1:] {
+					if _, err := podEvictor.EvictPod(ctx, pod, nodeMap[nodeName], "RemoveDuplicatePods"); err != nil {
+						klog.ErrorS(err, "Error evicting pod", "pod", klog.KObj(pod))
+						break
+					}
+				}
 			}
 		}
 	}
 }
 
-// listDuplicatePodsOnANode lists duplicate pods on a given node.
-// It checks for pods which have the same owner and have at least 1 container with the same image spec
-func listDuplicatePodsOnANode(ctx context.Context, client clientset.Interface, node *v1.Node, strategy api.DeschedulerStrategy, evictLocalStoragePods bool) []*v1.Pod {
-	pods, err := podutil.ListEvictablePodsOnNode(ctx, client, node, evictLocalStoragePods)
-	if err != nil {
+func getNodeAffinityNodeSelector(pod *v1.Pod) *v1.NodeSelector {
+	if pod.Spec.Affinity == nil {
 		return nil
 	}
+	if pod.Spec.Affinity.NodeAffinity == nil {
+		return nil
+	}
+	return pod.Spec.Affinity.NodeAffinity.RequiredDuringSchedulingIgnoredDuringExecution
+}
 
-	duplicatePods := make([]*v1.Pod, 0, len(pods))
-	// Each pod has a list of owners and a list of containers, and each container has 1 image spec.
-	// For each pod, we go through all the OwnerRef/Image mappings and represent them as a "key" string.
-	// All of those mappings together makes a list of "key" strings that essentially represent that pod's uniqueness.
-	// This list of keys representing a single pod is then sorted alphabetically.
-	// If any other pod has a list that matches that pod's list, those pods are undeniably duplicates for the following reasons:
-	//   - The 2 pods have the exact same ownerrefs
-	//   - The 2 pods have the exact same container images
-	//
-	// duplicateKeysMap maps the first Namespace/Kind/Name/Image in a pod's list to a 2D-slice of all the other lists where that is the first key
-	// (Since we sort each pod's list, we only need to key the map on the first entry in each list. Any pod that doesn't have
-	// the same first entry is clearly not a duplicate. This makes lookup quick and minimizes storage needed).
-	// If any of the existing lists for that first key matches the current pod's list, the current pod is a duplicate.
-	// If not, then we add this pod's list to the list of lists for that key.
-	duplicateKeysMap := map[string][][]string{}
-	for _, pod := range pods {
-		ownerRefList := podutil.OwnerRef(pod)
-		if hasExcludedOwnerRefKind(ownerRefList, strategy) {
-			continue
-		}
-		podContainerKeys := make([]string, 0, len(ownerRefList)*len(pod.Spec.Containers))
-		for _, ownerRef := range ownerRefList {
-			for _, container := range pod.Spec.Containers {
-				// Namespace/Kind/Name should be unique for the cluster.
-				// We also consider the image, as 2 pods could have the same owner but serve different purposes
-				// So any non-unique Namespace/Kind/Name/Image pattern is a duplicate pod.
-				s := strings.Join([]string{pod.ObjectMeta.Namespace, ownerRef.Kind, ownerRef.Name, container.Image}, "/")
-				podContainerKeys = append(podContainerKeys, s)
-			}
-		}
-		sort.Strings(podContainerKeys)
+func getTargetNodes(podNodes map[string][]*v1.Pod, nodes []*v1.Node) []*v1.Node {
+	// In order to reduce the number of pods processed, identify pods which have
+	// equal (tolerations, nodeselectors, node affinity) terms and considered them
+	// as identical. Identical pods wrt. (tolerations, nodeselectors, node affinity) terms
+	// will produce the same result when checking if a pod is feasible for a node.
+	// Thus, improving efficiency of processing pods marked for eviction.
 
-		// If there have been any other pods with the same first "key", look through all the lists to see if any match
-		if existing, ok := duplicateKeysMap[podContainerKeys[0]]; ok {
-			for _, keys := range existing {
-				if reflect.DeepEqual(keys, podContainerKeys) {
-					duplicatePods = append(duplicatePods, pod)
-					break
+	// Collect all distinct pods which differ in at least taints, node affinity or node selector terms
+	distinctPods := map[*v1.Pod]struct{}{}
+	for _, pods := range podNodes {
+		for _, pod := range pods {
+			duplicated := false
+			for dp := range distinctPods {
+				if utils.TolerationsEqual(pod.Spec.Tolerations, dp.Spec.Tolerations) &&
+					utils.NodeSelectorsEqual(getNodeAffinityNodeSelector(pod), getNodeAffinityNodeSelector(dp)) &&
+					reflect.DeepEqual(pod.Spec.NodeSelector, dp.Spec.NodeSelector) {
+					duplicated = true
+					continue
 				}
-				// Found no matches, add this list of keys to the list of lists that have the same first key
-				duplicateKeysMap[podContainerKeys[0]] = append(duplicateKeysMap[podContainerKeys[0]], podContainerKeys)
 			}
-		} else {
-			// This is the first pod we've seen that has this first "key" entry
-			duplicateKeysMap[podContainerKeys[0]] = [][]string{podContainerKeys}
+			if duplicated {
+				continue
+			}
+			distinctPods[pod] = struct{}{}
 		}
 	}
-	return duplicatePods
+
+	// For each distinct pod get a list of nodes where it can land
+	targetNodesMap := map[string]*v1.Node{}
+	for pod := range distinctPods {
+		matchingNodes := map[string]*v1.Node{}
+		for _, node := range nodes {
+			if !utils.TolerationsTolerateTaintsWithFilter(pod.Spec.Tolerations, node.Spec.Taints, func(taint *v1.Taint) bool {
+				return taint.Effect == v1.TaintEffectNoSchedule || taint.Effect == v1.TaintEffectNoExecute
+			}) {
+				continue
+			}
+			if match, err := utils.PodMatchNodeSelector(pod, node); err == nil && !match {
+				continue
+			}
+			matchingNodes[node.Name] = node
+		}
+		if len(matchingNodes) > 1 {
+			for nodeName := range matchingNodes {
+				targetNodesMap[nodeName] = matchingNodes[nodeName]
+			}
+		}
+	}
+
+	targetNodes := []*v1.Node{}
+	for _, node := range targetNodesMap {
+		targetNodes = append(targetNodes, node)
+	}
+
+	return targetNodes
 }
 
 func hasExcludedOwnerRefKind(ownerRefs []metav1.OwnerReference, strategy api.DeschedulerStrategy) bool {
-	if strategy.Params.RemoveDuplicates == nil {
+	if strategy.Params == nil || strategy.Params.RemoveDuplicates == nil {
 		return false
 	}
 	exclude := sets.NewString(strategy.Params.RemoveDuplicates.ExcludeOwnerKinds...)

pkg/descheduler/strategies/duplicates_test.go

@@ -20,8 +20,10 @@ import (
 	"context"
 	"testing"
 
-	"k8s.io/api/core/v1"
+	v1 "k8s.io/api/core/v1"
+	policyv1 "k8s.io/api/policy/v1"
 	"k8s.io/apimachinery/pkg/api/resource"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/client-go/kubernetes/fake"
 	core "k8s.io/client-go/testing"
@@ -31,35 +33,73 @@ import (
 	"sigs.k8s.io/descheduler/test"
 )
 
+func buildTestPodWithImage(podName, node, image string) *v1.Pod {
+	pod := test.BuildTestPod(podName, 100, 0, node, test.SetRSOwnerRef)
+	pod.Spec.Containers = append(pod.Spec.Containers, v1.Container{
+		Name:  image,
+		Image: image,
+	})
+	return pod
+}
+
 func TestFindDuplicatePods(t *testing.T) {
 	ctx := context.Background()
 	// first setup pods
-	node := test.BuildTestNode("n1", 2000, 3000, 10, nil)
-	p1 := test.BuildTestPod("p1", 100, 0, node.Name, nil)
+	node1 := test.BuildTestNode("n1", 2000, 3000, 10, nil)
+	node2 := test.BuildTestNode("n2", 2000, 3000, 10, nil)
+	node3 := test.BuildTestNode("n3", 2000, 3000, 10, func(node *v1.Node) {
+		node.Spec.Taints = []v1.Taint{
+			{
+				Key:    "hardware",
+				Value:  "gpu",
+				Effect: v1.TaintEffectNoSchedule,
+			},
+		}
+	})
+	node4 := test.BuildTestNode("n4", 2000, 3000, 10, func(node *v1.Node) {
+		node.ObjectMeta.Labels = map[string]string{
+			"datacenter": "east",
+		}
+	})
+	node5 := test.BuildTestNode("n5", 2000, 3000, 10, func(node *v1.Node) {
+		node.Spec = v1.NodeSpec{
+			Unschedulable: true,
+		}
+	})
+
+	p1 := test.BuildTestPod("p1", 100, 0, node1.Name, nil)
 	p1.Namespace = "dev"
-	p2 := test.BuildTestPod("p2", 100, 0, node.Name, nil)
+	p2 := test.BuildTestPod("p2", 100, 0, node1.Name, nil)
 	p2.Namespace = "dev"
-	p3 := test.BuildTestPod("p3", 100, 0, node.Name, nil)
+	p3 := test.BuildTestPod("p3", 100, 0, node1.Name, nil)
 	p3.Namespace = "dev"
-	p4 := test.BuildTestPod("p4", 100, 0, node.Name, nil)
-	p5 := test.BuildTestPod("p5", 100, 0, node.Name, nil)
-	p6 := test.BuildTestPod("p6", 100, 0, node.Name, nil)
-	p7 := test.BuildTestPod("p7", 100, 0, node.Name, nil)
+	p4 := test.BuildTestPod("p4", 100, 0, node1.Name, nil)
+	p5 := test.BuildTestPod("p5", 100, 0, node1.Name, nil)
+	p6 := test.BuildTestPod("p6", 100, 0, node1.Name, nil)
+	p7 := test.BuildTestPod("p7", 100, 0, node1.Name, nil)
 	p7.Namespace = "kube-system"
-	p8 := test.BuildTestPod("p8", 100, 0, node.Name, nil)
+	p8 := test.BuildTestPod("p8", 100, 0, node1.Name, nil)
 	p8.Namespace = "test"
-	p9 := test.BuildTestPod("p9", 100, 0, node.Name, nil)
+	p9 := test.BuildTestPod("p9", 100, 0, node1.Name, nil)
 	p9.Namespace = "test"
-	p10 := test.BuildTestPod("p10", 100, 0, node.Name, nil)
+	p10 := test.BuildTestPod("p10", 100, 0, node1.Name, nil)
 	p10.Namespace = "test"
-	p11 := test.BuildTestPod("p11", 100, 0, node.Name, nil)
+	p11 := test.BuildTestPod("p11", 100, 0, node1.Name, nil)
 	p11.Namespace = "different-images"
-	p12 := test.BuildTestPod("p12", 100, 0, node.Name, nil)
+	p12 := test.BuildTestPod("p12", 100, 0, node1.Name, nil)
 	p12.Namespace = "different-images"
-	p13 := test.BuildTestPod("p13", 100, 0, node.Name, nil)
+	p13 := test.BuildTestPod("p13", 100, 0, node1.Name, nil)
 	p13.Namespace = "different-images"
-	p14 := test.BuildTestPod("p14", 100, 0, node.Name, nil)
+	p14 := test.BuildTestPod("p14", 100, 0, node1.Name, nil)
 	p14.Namespace = "different-images"
+	p15 := test.BuildTestPod("p15", 100, 0, node1.Name, nil)
+	p15.Namespace = "node-fit"
+	p16 := test.BuildTestPod("NOT1", 100, 0, node1.Name, nil)
+	p16.Namespace = "node-fit"
+	p17 := test.BuildTestPod("NOT2", 100, 0, node1.Name, nil)
+	p17.Namespace = "node-fit"
+	p18 := test.BuildTestPod("TARGET", 100, 0, node1.Name, nil)
+	p18.Namespace = "node-fit"
 
 	// ### Evictable Pods ###
 
@@ -113,99 +153,560 @@ func TestFindDuplicatePods(t *testing.T) {
 		Image: "foo",
 	})
 
+	// ### Pods Evictable Based On Node Fit ###
+
+	ownerRef3 := test.GetReplicaSetOwnerRefList()
+	p15.ObjectMeta.OwnerReferences = ownerRef3
+	p16.ObjectMeta.OwnerReferences = ownerRef3
+	p17.ObjectMeta.OwnerReferences = ownerRef3
+	p18.ObjectMeta.OwnerReferences = ownerRef3
+
+	p15.Spec.NodeSelector = map[string]string{
+		"datacenter": "west",
+	}
+	p16.Spec.NodeSelector = map[string]string{
+		"datacenter": "west",
+	}
+	p17.Spec.NodeSelector = map[string]string{
+		"datacenter": "west",
+	}
+
 	testCases := []struct {
 		description             string
-		maxPodsToEvict          int
+		maxPodsToEvictPerNode   int
 		pods                    []v1.Pod
+		nodes                   []*v1.Node
 		expectedEvictedPodCount int
 		strategy                api.DeschedulerStrategy
 	}{
 		{
-			description:             "Three pods in the `dev` Namespace, bound to same ReplicaSet. 2 should be evicted.",
-			maxPodsToEvict:          5,
+			description:             "Three pods in the `dev` Namespace, bound to same ReplicaSet. 1 should be evicted.",
+			maxPodsToEvictPerNode:   5,
 			pods:                    []v1.Pod{*p1, *p2, *p3},
-			expectedEvictedPodCount: 2,
+			nodes:                   []*v1.Node{node1, node2},
+			expectedEvictedPodCount: 1,
 			strategy:                api.DeschedulerStrategy{},
 		},
 		{
 			description:             "Three pods in the `dev` Namespace, bound to same ReplicaSet, but ReplicaSet kind is excluded. 0 should be evicted.",
-			maxPodsToEvict:          5,
+			maxPodsToEvictPerNode:   5,
 			pods:                    []v1.Pod{*p1, *p2, *p3},
+			nodes:                   []*v1.Node{node1, node2},
 			expectedEvictedPodCount: 0,
-			strategy:                api.DeschedulerStrategy{Params: api.StrategyParameters{RemoveDuplicates: &api.RemoveDuplicates{ExcludeOwnerKinds: []string{"ReplicaSet"}}}},
+			strategy:                api.DeschedulerStrategy{Params: &api.StrategyParameters{RemoveDuplicates: &api.RemoveDuplicates{ExcludeOwnerKinds: []string{"ReplicaSet"}}}},
 		},
 		{
-			description:             "Three Pods in the `test` Namespace, bound to same ReplicaSet. 2 should be evicted.",
-			maxPodsToEvict:          5,
+			description:             "Three Pods in the `test` Namespace, bound to same ReplicaSet. 1 should be evicted.",
+			maxPodsToEvictPerNode:   5,
 			pods:                    []v1.Pod{*p8, *p9, *p10},
-			expectedEvictedPodCount: 2,
+			nodes:                   []*v1.Node{node1, node2},
+			expectedEvictedPodCount: 1,
 			strategy:                api.DeschedulerStrategy{},
 		},
 		{
 			description:             "Three Pods in the `dev` Namespace, three Pods in the `test` Namespace. Bound to ReplicaSet with same name. 4 should be evicted.",
-			maxPodsToEvict:          5,
+			maxPodsToEvictPerNode:   5,
 			pods:                    []v1.Pod{*p1, *p2, *p3, *p8, *p9, *p10},
-			expectedEvictedPodCount: 4,
+			nodes:                   []*v1.Node{node1, node2},
+			expectedEvictedPodCount: 2,
 			strategy:                api.DeschedulerStrategy{},
 		},
 		{
 			description:             "Pods are: part of DaemonSet, with local storage, mirror pod annotation, critical pod annotation - none should be evicted.",
-			maxPodsToEvict:          2,
+			maxPodsToEvictPerNode:   2,
 			pods:                    []v1.Pod{*p4, *p5, *p6, *p7},
+			nodes:                   []*v1.Node{node1, node2},
 			expectedEvictedPodCount: 0,
 			strategy:                api.DeschedulerStrategy{},
 		},
 		{
 			description:             "Test all Pods: 4 should be evicted.",
-			maxPodsToEvict:          5,
+			maxPodsToEvictPerNode:   5,
 			pods:                    []v1.Pod{*p1, *p2, *p3, *p4, *p5, *p6, *p7, *p8, *p9, *p10},
-			expectedEvictedPodCount: 4,
+			nodes:                   []*v1.Node{node1, node2},
+			expectedEvictedPodCount: 2,
 			strategy:                api.DeschedulerStrategy{},
 		},
 		{
 			description:             "Pods with the same owner but different images should not be evicted",
-			maxPodsToEvict:          5,
+			maxPodsToEvictPerNode:   5,
 			pods:                    []v1.Pod{*p11, *p12},
+			nodes:                   []*v1.Node{node1, node2},
 			expectedEvictedPodCount: 0,
 			strategy:                api.DeschedulerStrategy{},
 		},
 		{
 			description:             "Pods with multiple containers should not match themselves",
-			maxPodsToEvict:          5,
+			maxPodsToEvictPerNode:   5,
 			pods:                    []v1.Pod{*p13},
+			nodes:                   []*v1.Node{node1, node2},
 			expectedEvictedPodCount: 0,
 			strategy:                api.DeschedulerStrategy{},
 		},
 		{
 			description:             "Pods with matching ownerrefs and at not all matching image should not trigger an eviction",
-			maxPodsToEvict:          5,
+			maxPodsToEvictPerNode:   5,
 			pods:                    []v1.Pod{*p11, *p13},
+			nodes:                   []*v1.Node{node1, node2},
 			expectedEvictedPodCount: 0,
 			strategy:                api.DeschedulerStrategy{},
 		},
+		{
+			description:             "Three pods in the `dev` Namespace, bound to same ReplicaSet. Only node available has a taint, and nodeFit set to true. 0 should be evicted.",
+			maxPodsToEvictPerNode:   5,
+			pods:                    []v1.Pod{*p1, *p2, *p3},
+			nodes:                   []*v1.Node{node1, node3},
+			expectedEvictedPodCount: 0,
+			strategy:                api.DeschedulerStrategy{Params: &api.StrategyParameters{NodeFit: true}},
+		},
+		{
+			description:             "Three pods in the `node-fit` Namespace, bound to same ReplicaSet, all with a nodeSelector. Only node available has an incorrect node label, and nodeFit set to true. 0 should be evicted.",
+			maxPodsToEvictPerNode:   5,
+			pods:                    []v1.Pod{*p15, *p16, *p17},
+			nodes:                   []*v1.Node{node1, node4},
+			expectedEvictedPodCount: 0,
+			strategy:                api.DeschedulerStrategy{Params: &api.StrategyParameters{NodeFit: true}},
+		},
+		{
+			description:             "Three pods in the `node-fit` Namespace, bound to same ReplicaSet. Only node available is not schedulable, and nodeFit set to true. 0 should be evicted.",
+			maxPodsToEvictPerNode:   5,
+			pods:                    []v1.Pod{*p1, *p2, *p3},
+			nodes:                   []*v1.Node{node1, node5},
+			expectedEvictedPodCount: 0,
+			strategy:                api.DeschedulerStrategy{Params: &api.StrategyParameters{NodeFit: true}},
+		},
 	}
 
 	for _, testCase := range testCases {
-		fakeClient := &fake.Clientset{}
-		fakeClient.Fake.AddReactor("list", "pods", func(action core.Action) (bool, runtime.Object, error) {
-			return true, &v1.PodList{Items: testCase.pods}, nil
-		})
-		fakeClient.Fake.AddReactor("get", "nodes", func(action core.Action) (bool, runtime.Object, error) {
-			return true, node, nil
-		})
-		podEvictor := evictions.NewPodEvictor(
-			fakeClient,
-			"v1",
-			false,
-			testCase.maxPodsToEvict,
-			[]*v1.Node{node},
-		)
+		t.Run(testCase.description, func(t *testing.T) {
+			fakeClient := &fake.Clientset{}
+			fakeClient.Fake.AddReactor("list", "pods", func(action core.Action) (bool, runtime.Object, error) {
+				return true, &v1.PodList{Items: testCase.pods}, nil
+			})
+			podEvictor := evictions.NewPodEvictor(
+				fakeClient,
+				"v1",
+				false,
+				testCase.maxPodsToEvictPerNode,
+				testCase.nodes,
+				false,
+				false,
+				false,
+			)
 
-		RemoveDuplicatePods(ctx, fakeClient, testCase.strategy, []*v1.Node{node}, false, podEvictor)
-		podsEvicted := podEvictor.TotalEvicted()
-		if podsEvicted != testCase.expectedEvictedPodCount {
-			t.Errorf("Test error for description: %s. Expected evicted pods count %v, got %v", testCase.description, testCase.expectedEvictedPodCount, podsEvicted)
-		}
+			RemoveDuplicatePods(ctx, fakeClient, testCase.strategy, testCase.nodes, podEvictor)
+			podsEvicted := podEvictor.TotalEvicted()
+			if podsEvicted != testCase.expectedEvictedPodCount {
+				t.Errorf("Test error for description: %s. Expected evicted pods count %v, got %v", testCase.description, testCase.expectedEvictedPodCount, podsEvicted)
+			}
+		})
 	}
 
 }
+
+func TestRemoveDuplicatesUniformly(t *testing.T) {
+	ctx := context.Background()
+
+	setRSOwnerRef2 := func(pod *v1.Pod) {
+		pod.ObjectMeta.OwnerReferences = []metav1.OwnerReference{
+			{Kind: "ReplicaSet", APIVersion: "v1", Name: "replicaset-2"},
+		}
+	}
+	setTwoRSOwnerRef := func(pod *v1.Pod) {
+		pod.ObjectMeta.OwnerReferences = []metav1.OwnerReference{
+			{Kind: "ReplicaSet", APIVersion: "v1", Name: "replicaset-1"},
+			{Kind: "ReplicaSet", APIVersion: "v1", Name: "replicaset-2"},
+		}
+	}
+
+	setTolerationsK1 := func(pod *v1.Pod) {
+		test.SetRSOwnerRef(pod)
+		pod.Spec.Tolerations = []v1.Toleration{
+			{
+				Key:      "k1",
+				Value:    "v1",
+				Operator: v1.TolerationOpEqual,
+				Effect:   v1.TaintEffectNoSchedule,
+			},
+		}
+	}
+	setTolerationsK2 := func(pod *v1.Pod) {
+		test.SetRSOwnerRef(pod)
+		pod.Spec.Tolerations = []v1.Toleration{
+			{
+				Key:      "k2",
+				Value:    "v2",
+				Operator: v1.TolerationOpEqual,
+				Effect:   v1.TaintEffectNoSchedule,
+			},
+		}
+	}
+
+	setMasterNoScheduleTaint := func(node *v1.Node) {
+		node.Spec.Taints = []v1.Taint{
+			{
+				Effect: v1.TaintEffectNoSchedule,
+				Key:    "node-role.kubernetes.io/master",
+			},
+		}
+	}
+
+	setMasterNoScheduleLabel := func(node *v1.Node) {
+		if node.ObjectMeta.Labels == nil {
+			node.ObjectMeta.Labels = map[string]string{}
+		}
+		node.ObjectMeta.Labels["node-role.kubernetes.io/master"] = ""
+	}
+
+	setWorkerLabel := func(node *v1.Node) {
+		if node.ObjectMeta.Labels == nil {
+			node.ObjectMeta.Labels = map[string]string{}
+		}
+		node.ObjectMeta.Labels["node-role.kubernetes.io/worker"] = "k1"
+		node.ObjectMeta.Labels["node-role.kubernetes.io/worker"] = "k2"
+	}
+
+	setNotMasterNodeSelectorK1 := func(pod *v1.Pod) {
+		test.SetRSOwnerRef(pod)
+		pod.Spec.Affinity = &v1.Affinity{
+			NodeAffinity: &v1.NodeAffinity{
+				RequiredDuringSchedulingIgnoredDuringExecution: &v1.NodeSelector{
+					NodeSelectorTerms: []v1.NodeSelectorTerm{
+						{
+							MatchExpressions: []v1.NodeSelectorRequirement{
+								{
+									Key:      "node-role.kubernetes.io/master",
+									Operator: v1.NodeSelectorOpDoesNotExist,
+								},
+								{
+									Key:      "k1",
+									Operator: v1.NodeSelectorOpDoesNotExist,
+								},
+							},
+						},
+					},
+				},
+			},
+		}
+	}
+
+	setNotMasterNodeSelectorK2 := func(pod *v1.Pod) {
+		test.SetRSOwnerRef(pod)
+		pod.Spec.Affinity = &v1.Affinity{
+			NodeAffinity: &v1.NodeAffinity{
+				RequiredDuringSchedulingIgnoredDuringExecution: &v1.NodeSelector{
+					NodeSelectorTerms: []v1.NodeSelectorTerm{
+						{
+							MatchExpressions: []v1.NodeSelectorRequirement{
+								{
+									Key:      "node-role.kubernetes.io/master",
+									Operator: v1.NodeSelectorOpDoesNotExist,
+								},
+								{
+									Key:      "k2",
+									Operator: v1.NodeSelectorOpDoesNotExist,
+								},
+							},
+						},
+					},
+				},
+			},
+		}
+	}
+
+	setWorkerLabelSelectorK1 := func(pod *v1.Pod) {
+		test.SetRSOwnerRef(pod)
+		if pod.Spec.NodeSelector == nil {
+			pod.Spec.NodeSelector = map[string]string{}
+		}
+		pod.Spec.NodeSelector["node-role.kubernetes.io/worker"] = "k1"
+	}
+
+	setWorkerLabelSelectorK2 := func(pod *v1.Pod) {
+		test.SetRSOwnerRef(pod)
+		if pod.Spec.NodeSelector == nil {
+			pod.Spec.NodeSelector = map[string]string{}
+		}
+		pod.Spec.NodeSelector["node-role.kubernetes.io/worker"] = "k2"
+	}
+
+	testCases := []struct {
+		description             string
+		maxPodsToEvictPerNode   int
+		pods                    []v1.Pod
+		nodes                   []*v1.Node
+		expectedEvictedPodCount int
+		strategy                api.DeschedulerStrategy
+	}{
+		{
+			description: "Evict pods uniformly",
+			pods: []v1.Pod{
+				// (5,3,1) -> (3,3,3) -> 2 evictions
+				*test.BuildTestPod("p1", 100, 0, "n1", test.SetRSOwnerRef),
+				*test.BuildTestPod("p2", 100, 0, "n1", test.SetRSOwnerRef),
+				*test.BuildTestPod("p3", 100, 0, "n1", test.SetRSOwnerRef),
+				*test.BuildTestPod("p4", 100, 0, "n1", test.SetRSOwnerRef),
+				*test.BuildTestPod("p5", 100, 0, "n1", test.SetRSOwnerRef),
+				*test.BuildTestPod("p6", 100, 0, "n2", test.SetRSOwnerRef),
+				*test.BuildTestPod("p7", 100, 0, "n2", test.SetRSOwnerRef),
+				*test.BuildTestPod("p8", 100, 0, "n2", test.SetRSOwnerRef),
+				*test.BuildTestPod("p9", 100, 0, "n3", test.SetRSOwnerRef),
+			},
+			expectedEvictedPodCount: 2,
+			nodes: []*v1.Node{
+				test.BuildTestNode("n1", 2000, 3000, 10, nil),
+				test.BuildTestNode("n2", 2000, 3000, 10, nil),
+				test.BuildTestNode("n3", 2000, 3000, 10, nil),
+			},
+			strategy: api.DeschedulerStrategy{},
+		},
+		{
+			description: "Evict pods uniformly with one node left out",
+			pods: []v1.Pod{
+				// (5,3,1) -> (4,4,1) -> 1 eviction
+				*test.BuildTestPod("p1", 100, 0, "n1", test.SetRSOwnerRef),
+				*test.BuildTestPod("p2", 100, 0, "n1", test.SetRSOwnerRef),
+				*test.BuildTestPod("p3", 100, 0, "n1", test.SetRSOwnerRef),
+				*test.BuildTestPod("p4", 100, 0, "n1", test.SetRSOwnerRef),
+				*test.BuildTestPod("p5", 100, 0, "n1", test.SetRSOwnerRef),
+				*test.BuildTestPod("p6", 100, 0, "n2", test.SetRSOwnerRef),
+				*test.BuildTestPod("p7", 100, 0, "n2", test.SetRSOwnerRef),
+				*test.BuildTestPod("p8", 100, 0, "n2", test.SetRSOwnerRef),
+				*test.BuildTestPod("p9", 100, 0, "n3", test.SetRSOwnerRef),
+			},
+			expectedEvictedPodCount: 1,
+			nodes: []*v1.Node{
+				test.BuildTestNode("n1", 2000, 3000, 10, nil),
+				test.BuildTestNode("n2", 2000, 3000, 10, nil),
+			},
+			strategy: api.DeschedulerStrategy{},
+		},
+		{
+			description: "Evict pods uniformly with two replica sets",
+			pods: []v1.Pod{
+				// (5,3,1) -> (3,3,3) -> 2 evictions
+				*test.BuildTestPod("p11", 100, 0, "n1", setTwoRSOwnerRef),
+				*test.BuildTestPod("p12", 100, 0, "n1", setTwoRSOwnerRef),
+				*test.BuildTestPod("p13", 100, 0, "n1", setTwoRSOwnerRef),
+				*test.BuildTestPod("p14", 100, 0, "n1", setTwoRSOwnerRef),
+				*test.BuildTestPod("p15", 100, 0, "n1", setTwoRSOwnerRef),
+				*test.BuildTestPod("p16", 100, 0, "n2", setTwoRSOwnerRef),
+				*test.BuildTestPod("p17", 100, 0, "n2", setTwoRSOwnerRef),
+				*test.BuildTestPod("p18", 100, 0, "n2", setTwoRSOwnerRef),
+				*test.BuildTestPod("p19", 100, 0, "n3", setTwoRSOwnerRef),
+			},
+			expectedEvictedPodCount: 4,
+			nodes: []*v1.Node{
+				test.BuildTestNode("n1", 2000, 3000, 10, nil),
+				test.BuildTestNode("n2", 2000, 3000, 10, nil),
+				test.BuildTestNode("n3", 2000, 3000, 10, nil),
+			},
+			strategy: api.DeschedulerStrategy{},
+		},
+		{
+			description: "Evict pods uniformly with two owner references",
+			pods: []v1.Pod{
+				// (5,3,1) -> (3,3,3) -> 2 evictions
+				*test.BuildTestPod("p11", 100, 0, "n1", test.SetRSOwnerRef),
+				*test.BuildTestPod("p12", 100, 0, "n1", test.SetRSOwnerRef),
+				*test.BuildTestPod("p13", 100, 0, "n1", test.SetRSOwnerRef),
+				*test.BuildTestPod("p14", 100, 0, "n1", test.SetRSOwnerRef),
+				*test.BuildTestPod("p15", 100, 0, "n1", test.SetRSOwnerRef),
+				*test.BuildTestPod("p16", 100, 0, "n2", test.SetRSOwnerRef),
+				*test.BuildTestPod("p17", 100, 0, "n2", test.SetRSOwnerRef),
+				*test.BuildTestPod("p18", 100, 0, "n2", test.SetRSOwnerRef),
+				*test.BuildTestPod("p19", 100, 0, "n3", test.SetRSOwnerRef),
+				// (1,3,5) -> (3,3,3) -> 2 evictions
+				*test.BuildTestPod("p21", 100, 0, "n1", setRSOwnerRef2),
+				*test.BuildTestPod("p22", 100, 0, "n2", setRSOwnerRef2),
+				*test.BuildTestPod("p23", 100, 0, "n2", setRSOwnerRef2),
+				*test.BuildTestPod("p24", 100, 0, "n2", setRSOwnerRef2),
+				*test.BuildTestPod("p25", 100, 0, "n3", setRSOwnerRef2),
+				*test.BuildTestPod("p26", 100, 0, "n3", setRSOwnerRef2),
+				*test.BuildTestPod("p27", 100, 0, "n3", setRSOwnerRef2),
+				*test.BuildTestPod("p28", 100, 0, "n3", setRSOwnerRef2),
+				*test.BuildTestPod("p29", 100, 0, "n3", setRSOwnerRef2),
+			},
+			expectedEvictedPodCount: 4,
+			nodes: []*v1.Node{
+				test.BuildTestNode("n1", 2000, 3000, 10, nil),
+				test.BuildTestNode("n2", 2000, 3000, 10, nil),
+				test.BuildTestNode("n3", 2000, 3000, 10, nil),
+			},
+			strategy: api.DeschedulerStrategy{},
+		},
+		{
+			description: "Evict pods with number of pods less than nodes",
+			pods: []v1.Pod{
+				// (2,0,0) -> (1,1,0) -> 1 eviction
+				*test.BuildTestPod("p1", 100, 0, "n1", test.SetRSOwnerRef),
+				*test.BuildTestPod("p2", 100, 0, "n1", test.SetRSOwnerRef),
+			},
+			expectedEvictedPodCount: 1,
+			nodes: []*v1.Node{
+				test.BuildTestNode("n1", 2000, 3000, 10, nil),
+				test.BuildTestNode("n2", 2000, 3000, 10, nil),
+				test.BuildTestNode("n3", 2000, 3000, 10, nil),
+			},
+			strategy: api.DeschedulerStrategy{},
+		},
+		{
+			description: "Evict pods with number of pods less than nodes, but ignore different pods with the same ownerref",
+			pods: []v1.Pod{
+				// (1, 0, 0) for "bar","baz" images -> no eviction, even with a matching ownerKey
+				// (2, 0, 0) for "foo" image -> (1,1,0) - 1 eviction
+				// In this case the only "real" duplicates are p1 and p4, so one of those should be evicted
+				*buildTestPodWithImage("p1", "n1", "foo"),
+				*buildTestPodWithImage("p2", "n1", "bar"),
+				*buildTestPodWithImage("p3", "n1", "baz"),
+				*buildTestPodWithImage("p4", "n1", "foo"),
+			},
+			expectedEvictedPodCount: 1,
+			nodes: []*v1.Node{
+				test.BuildTestNode("n1", 2000, 3000, 10, nil),
+				test.BuildTestNode("n2", 2000, 3000, 10, nil),
+				test.BuildTestNode("n3", 2000, 3000, 10, nil),
+			},
+			strategy: api.DeschedulerStrategy{},
+		},
+		{
+			description: "Evict pods with a single pod with three nodes",
+			pods: []v1.Pod{
+				// (2,0,0) -> (1,1,0) -> 1 eviction
+				*test.BuildTestPod("p1", 100, 0, "n1", test.SetRSOwnerRef),
+			},
+			expectedEvictedPodCount: 0,
+			nodes: []*v1.Node{
+				test.BuildTestNode("n1", 2000, 3000, 10, nil),
+				test.BuildTestNode("n2", 2000, 3000, 10, nil),
+				test.BuildTestNode("n3", 2000, 3000, 10, nil),
+			},
+			strategy: api.DeschedulerStrategy{},
+		},
+		{
+			description: "Evict pods uniformly respecting taints",
+			pods: []v1.Pod{
+				// (5,3,1,0,0,0) -> (3,3,3,0,0,0) -> 2 evictions
+				*test.BuildTestPod("p1", 100, 0, "worker1", setTolerationsK1),
+				*test.BuildTestPod("p2", 100, 0, "worker1", setTolerationsK2),
+				*test.BuildTestPod("p3", 100, 0, "worker1", setTolerationsK1),
+				*test.BuildTestPod("p4", 100, 0, "worker1", setTolerationsK2),
+				*test.BuildTestPod("p5", 100, 0, "worker1", setTolerationsK1),
+				*test.BuildTestPod("p6", 100, 0, "worker2", setTolerationsK2),
+				*test.BuildTestPod("p7", 100, 0, "worker2", setTolerationsK1),
+				*test.BuildTestPod("p8", 100, 0, "worker2", setTolerationsK2),
+				*test.BuildTestPod("p9", 100, 0, "worker3", setTolerationsK1),
+			},
+			expectedEvictedPodCount: 2,
+			nodes: []*v1.Node{
+				test.BuildTestNode("worker1", 2000, 3000, 10, nil),
+				test.BuildTestNode("worker2", 2000, 3000, 10, nil),
+				test.BuildTestNode("worker3", 2000, 3000, 10, nil),
+				test.BuildTestNode("master1", 2000, 3000, 10, setMasterNoScheduleTaint),
+				test.BuildTestNode("master2", 2000, 3000, 10, setMasterNoScheduleTaint),
+				test.BuildTestNode("master3", 2000, 3000, 10, setMasterNoScheduleTaint),
+			},
+			strategy: api.DeschedulerStrategy{},
+		},
+		{
+			description: "Evict pods uniformly respecting RequiredDuringSchedulingIgnoredDuringExecution node affinity",
+			pods: []v1.Pod{
+				// (5,3,1,0,0,0) -> (3,3,3,0,0,0) -> 2 evictions
+				*test.BuildTestPod("p1", 100, 0, "worker1", setNotMasterNodeSelectorK1),
+				*test.BuildTestPod("p2", 100, 0, "worker1", setNotMasterNodeSelectorK2),
+				*test.BuildTestPod("p3", 100, 0, "worker1", setNotMasterNodeSelectorK1),
+				*test.BuildTestPod("p4", 100, 0, "worker1", setNotMasterNodeSelectorK2),
+				*test.BuildTestPod("p5", 100, 0, "worker1", setNotMasterNodeSelectorK1),
+				*test.BuildTestPod("p6", 100, 0, "worker2", setNotMasterNodeSelectorK2),
+				*test.BuildTestPod("p7", 100, 0, "worker2", setNotMasterNodeSelectorK1),
+				*test.BuildTestPod("p8", 100, 0, "worker2", setNotMasterNodeSelectorK2),
+				*test.BuildTestPod("p9", 100, 0, "worker3", setNotMasterNodeSelectorK1),
+			},
+			expectedEvictedPodCount: 2,
+			nodes: []*v1.Node{
+				test.BuildTestNode("worker1", 2000, 3000, 10, nil),
+				test.BuildTestNode("worker2", 2000, 3000, 10, nil),
+				test.BuildTestNode("worker3", 2000, 3000, 10, nil),
+				test.BuildTestNode("master1", 2000, 3000, 10, setMasterNoScheduleLabel),
+				test.BuildTestNode("master2", 2000, 3000, 10, setMasterNoScheduleLabel),
+				test.BuildTestNode("master3", 2000, 3000, 10, setMasterNoScheduleLabel),
+			},
+			strategy: api.DeschedulerStrategy{},
+		},
+		{
+			description: "Evict pods uniformly respecting node selector",
+			pods: []v1.Pod{
+				// (5,3,1,0,0,0) -> (3,3,3,0,0,0) -> 2 evictions
+				*test.BuildTestPod("p1", 100, 0, "worker1", setWorkerLabelSelectorK1),
+				*test.BuildTestPod("p2", 100, 0, "worker1", setWorkerLabelSelectorK2),
+				*test.BuildTestPod("p3", 100, 0, "worker1", setWorkerLabelSelectorK1),
+				*test.BuildTestPod("p4", 100, 0, "worker1", setWorkerLabelSelectorK2),
+				*test.BuildTestPod("p5", 100, 0, "worker1", setWorkerLabelSelectorK1),
+				*test.BuildTestPod("p6", 100, 0, "worker2", setWorkerLabelSelectorK2),
+				*test.BuildTestPod("p7", 100, 0, "worker2", setWorkerLabelSelectorK1),
+				*test.BuildTestPod("p8", 100, 0, "worker2", setWorkerLabelSelectorK2),
+				*test.BuildTestPod("p9", 100, 0, "worker3", setWorkerLabelSelectorK1),
+			},
+			expectedEvictedPodCount: 2,
+			nodes: []*v1.Node{
+				test.BuildTestNode("worker1", 2000, 3000, 10, setWorkerLabel),
+				test.BuildTestNode("worker2", 2000, 3000, 10, setWorkerLabel),
+				test.BuildTestNode("worker3", 2000, 3000, 10, setWorkerLabel),
+				test.BuildTestNode("master1", 2000, 3000, 10, nil),
+				test.BuildTestNode("master2", 2000, 3000, 10, nil),
+				test.BuildTestNode("master3", 2000, 3000, 10, nil),
+			},
+			strategy: api.DeschedulerStrategy{},
+		},
+		{
+			description: "Evict pods uniformly respecting node selector with zero target nodes",
+			pods: []v1.Pod{
+				// (5,3,1,0,0,0) -> (3,3,3,0,0,0) -> 2 evictions
+				*test.BuildTestPod("p1", 100, 0, "worker1", setWorkerLabelSelectorK1),
+				*test.BuildTestPod("p2", 100, 0, "worker1", setWorkerLabelSelectorK2),
+				*test.BuildTestPod("p3", 100, 0, "worker1", setWorkerLabelSelectorK1),
+				*test.BuildTestPod("p4", 100, 0, "worker1", setWorkerLabelSelectorK2),
+				*test.BuildTestPod("p5", 100, 0, "worker1", setWorkerLabelSelectorK1),
+				*test.BuildTestPod("p6", 100, 0, "worker2", setWorkerLabelSelectorK2),
+				*test.BuildTestPod("p7", 100, 0, "worker2", setWorkerLabelSelectorK1),
+				*test.BuildTestPod("p8", 100, 0, "worker2", setWorkerLabelSelectorK2),
+				*test.BuildTestPod("p9", 100, 0, "worker3", setWorkerLabelSelectorK1),
+			},
+			expectedEvictedPodCount: 0,
+			nodes: []*v1.Node{
+				test.BuildTestNode("worker1", 2000, 3000, 10, nil),
+				test.BuildTestNode("worker2", 2000, 3000, 10, nil),
+				test.BuildTestNode("worker3", 2000, 3000, 10, nil),
+				test.BuildTestNode("master1", 2000, 3000, 10, nil),
+				test.BuildTestNode("master2", 2000, 3000, 10, nil),
+				test.BuildTestNode("master3", 2000, 3000, 10, nil),
+			},
+			strategy: api.DeschedulerStrategy{},
+		},
+	}
+
+	for _, testCase := range testCases {
+		t.Run(testCase.description, func(t *testing.T) {
+			fakeClient := &fake.Clientset{}
+			fakeClient.Fake.AddReactor("list", "pods", func(action core.Action) (bool, runtime.Object, error) {
+				return true, &v1.PodList{Items: testCase.pods}, nil
+			})
+			podEvictor := evictions.NewPodEvictor(
+				fakeClient,
+				policyv1.SchemeGroupVersion.String(),
+				false,
+				testCase.maxPodsToEvictPerNode,
+				testCase.nodes,
+				false,
+				false,
+				false,
+			)
+
+			RemoveDuplicatePods(ctx, fakeClient, testCase.strategy, testCase.nodes, podEvictor)
+			podsEvicted := podEvictor.TotalEvicted()
+			if podsEvicted != testCase.expectedEvictedPodCount {
+				t.Errorf("Test error for description: %s. Expected evicted pods count %v, got %v", testCase.description, testCase.expectedEvictedPodCount, podsEvicted)
+			}
+		})
+	}
+}

pkg/descheduler/strategies/lownodeutilization.go

@@ -1,432 +0,0 @@
-/*
-Copyright 2017 The Kubernetes Authors.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package strategies
-
-import (
-	"context"
-	"sort"
-
-	v1 "k8s.io/api/core/v1"
-	"k8s.io/apimachinery/pkg/api/resource"
-	clientset "k8s.io/client-go/kubernetes"
-	"k8s.io/klog"
-
-	"sigs.k8s.io/descheduler/pkg/api"
-	"sigs.k8s.io/descheduler/pkg/descheduler/evictions"
-	nodeutil "sigs.k8s.io/descheduler/pkg/descheduler/node"
-	podutil "sigs.k8s.io/descheduler/pkg/descheduler/pod"
-	"sigs.k8s.io/descheduler/pkg/utils"
-)
-
-type NodeUsageMap struct {
-	node    *v1.Node
-	usage   api.ResourceThresholds
-	allPods []*v1.Pod
-}
-
-type NodePodsMap map[*v1.Node][]*v1.Pod
-
-func LowNodeUtilization(ctx context.Context, client clientset.Interface, strategy api.DeschedulerStrategy, nodes []*v1.Node, evictLocalStoragePods bool, podEvictor *evictions.PodEvictor) {
-	if !strategy.Enabled {
-		return
-	}
-	// todo: move to config validation?
-	// TODO: May be create a struct for the strategy as well, so that we don't have to pass along the all the params?
-	if strategy.Params.NodeResourceUtilizationThresholds == nil {
-		klog.V(1).Infof("NodeResourceUtilizationThresholds not set")
-		return
-	}
-
-	thresholds := strategy.Params.NodeResourceUtilizationThresholds.Thresholds
-	if !validateThresholds(thresholds) {
-		return
-	}
-	targetThresholds := strategy.Params.NodeResourceUtilizationThresholds.TargetThresholds
-	if !validateTargetThresholds(targetThresholds) {
-		return
-	}
-
-	npm := createNodePodsMap(ctx, client, nodes)
-	lowNodes, targetNodes := classifyNodes(npm, thresholds, targetThresholds, evictLocalStoragePods)
-
-	klog.V(1).Infof("Criteria for a node under utilization: CPU: %v, Mem: %v, Pods: %v",
-		thresholds[v1.ResourceCPU], thresholds[v1.ResourceMemory], thresholds[v1.ResourcePods])
-
-	if len(lowNodes) == 0 {
-		klog.V(1).Infof("No node is underutilized, nothing to do here, you might tune your thresholds further")
-		return
-	}
-	klog.V(1).Infof("Total number of underutilized nodes: %v", len(lowNodes))
-
-	if len(lowNodes) < strategy.Params.NodeResourceUtilizationThresholds.NumberOfNodes {
-		klog.V(1).Infof("number of nodes underutilized (%v) is less than NumberOfNodes (%v), nothing to do here", len(lowNodes), strategy.Params.NodeResourceUtilizationThresholds.NumberOfNodes)
-		return
-	}
-
-	if len(lowNodes) == len(nodes) {
-		klog.V(1).Infof("all nodes are underutilized, nothing to do here")
-		return
-	}
-
-	if len(targetNodes) == 0 {
-		klog.V(1).Infof("all nodes are under target utilization, nothing to do here")
-		return
-	}
-
-	klog.V(1).Infof("Criteria for a node above target utilization: CPU: %v, Mem: %v, Pods: %v",
-		targetThresholds[v1.ResourceCPU], targetThresholds[v1.ResourceMemory], targetThresholds[v1.ResourcePods])
-	klog.V(1).Infof("Total number of nodes above target utilization: %v", len(targetNodes))
-
-	evictPodsFromTargetNodes(
-		ctx,
-		targetNodes,
-		lowNodes,
-		targetThresholds,
-		evictLocalStoragePods,
-		podEvictor)
-
-	klog.V(1).Infof("Total number of pods evicted: %v", podEvictor.TotalEvicted())
-}
-
-func validateThresholds(thresholds api.ResourceThresholds) bool {
-	if thresholds == nil || len(thresholds) == 0 {
-		klog.V(1).Infof("no resource threshold is configured")
-		return false
-	}
-	for name := range thresholds {
-		switch name {
-		case v1.ResourceCPU:
-			continue
-		case v1.ResourceMemory:
-			continue
-		case v1.ResourcePods:
-			continue
-		default:
-			klog.Errorf("only cpu, memory, or pods thresholds can be specified")
-			return false
-		}
-	}
-	return true
-}
-
-//This function could be merged into above once we are clear.
-func validateTargetThresholds(targetThresholds api.ResourceThresholds) bool {
-	if targetThresholds == nil {
-		klog.V(1).Infof("no target resource threshold is configured")
-		return false
-	} else if _, ok := targetThresholds[v1.ResourcePods]; !ok {
-		klog.V(1).Infof("no target resource threshold for pods is configured")
-		return false
-	}
-	return true
-}
-
-// classifyNodes classifies the nodes into low-utilization or high-utilization nodes. If a node lies between
-// low and high thresholds, it is simply ignored.
-func classifyNodes(npm NodePodsMap, thresholds api.ResourceThresholds, targetThresholds api.ResourceThresholds, evictLocalStoragePods bool) ([]NodeUsageMap, []NodeUsageMap) {
-	lowNodes, targetNodes := []NodeUsageMap{}, []NodeUsageMap{}
-	for node, pods := range npm {
-		usage := nodeUtilization(node, pods, evictLocalStoragePods)
-		nuMap := NodeUsageMap{
-			node:    node,
-			usage:   usage,
-			allPods: pods,
-		}
-		// Check if node is underutilized and if we can schedule pods on it.
-		if !nodeutil.IsNodeUnschedulable(node) && IsNodeWithLowUtilization(usage, thresholds) {
-			klog.V(2).Infof("Node %#v is under utilized with usage: %#v", node.Name, usage)
-			lowNodes = append(lowNodes, nuMap)
-		} else if IsNodeAboveTargetUtilization(usage, targetThresholds) {
-			klog.V(2).Infof("Node %#v is over utilized with usage: %#v", node.Name, usage)
-			targetNodes = append(targetNodes, nuMap)
-		} else {
-			klog.V(2).Infof("Node %#v is appropriately utilized with usage: %#v", node.Name, usage)
-		}
-	}
-	return lowNodes, targetNodes
-}
-
-// evictPodsFromTargetNodes evicts pods based on priority, if all the pods on the node have priority, if not
-// evicts them based on QoS as fallback option.
-// TODO: @ravig Break this function into smaller functions.
-func evictPodsFromTargetNodes(
-	ctx context.Context,
-	targetNodes, lowNodes []NodeUsageMap,
-	targetThresholds api.ResourceThresholds,
-	evictLocalStoragePods bool,
-	podEvictor *evictions.PodEvictor,
-) {
-
-	SortNodesByUsage(targetNodes)
-
-	// upper bound on total number of pods/cpu/memory to be moved
-	var totalPods, totalCPU, totalMem float64
-	var taintsOfLowNodes = make(map[string][]v1.Taint, len(lowNodes))
-	for _, node := range lowNodes {
-		taintsOfLowNodes[node.node.Name] = node.node.Spec.Taints
-		nodeCapacity := node.node.Status.Capacity
-		if len(node.node.Status.Allocatable) > 0 {
-			nodeCapacity = node.node.Status.Allocatable
-		}
-		// totalPods to be moved
-		podsPercentage := targetThresholds[v1.ResourcePods] - node.usage[v1.ResourcePods]
-		totalPods += ((float64(podsPercentage) * float64(nodeCapacity.Pods().Value())) / 100)
-
-		// totalCPU capacity to be moved
-		if _, ok := targetThresholds[v1.ResourceCPU]; ok {
-			cpuPercentage := targetThresholds[v1.ResourceCPU] - node.usage[v1.ResourceCPU]
-			totalCPU += ((float64(cpuPercentage) * float64(nodeCapacity.Cpu().MilliValue())) / 100)
-		}
-
-		// totalMem capacity to be moved
-		if _, ok := targetThresholds[v1.ResourceMemory]; ok {
-			memPercentage := targetThresholds[v1.ResourceMemory] - node.usage[v1.ResourceMemory]
-			totalMem += ((float64(memPercentage) * float64(nodeCapacity.Memory().Value())) / 100)
-		}
-	}
-
-	klog.V(1).Infof("Total capacity to be moved: CPU:%v, Mem:%v, Pods:%v", totalCPU, totalMem, totalPods)
-	klog.V(1).Infof("********Number of pods evicted from each node:***********")
-
-	for _, node := range targetNodes {
-		nodeCapacity := node.node.Status.Capacity
-		if len(node.node.Status.Allocatable) > 0 {
-			nodeCapacity = node.node.Status.Allocatable
-		}
-		klog.V(3).Infof("evicting pods from node %#v with usage: %#v", node.node.Name, node.usage)
-
-		nonRemovablePods, bestEffortPods, burstablePods, guaranteedPods := classifyPods(node.allPods, evictLocalStoragePods)
-		klog.V(2).Infof("allPods:%v, nonRemovablePods:%v, bestEffortPods:%v, burstablePods:%v, guaranteedPods:%v", len(node.allPods), len(nonRemovablePods), len(bestEffortPods), len(burstablePods), len(guaranteedPods))
-
-		// Check if one pod has priority, if yes, assume that all pods have priority and evict pods based on priority.
-		if node.allPods[0].Spec.Priority != nil {
-			klog.V(1).Infof("All pods have priority associated with them. Evicting pods based on priority")
-			evictablePods := make([]*v1.Pod, 0)
-			evictablePods = append(append(burstablePods, bestEffortPods...), guaranteedPods...)
-
-			// sort the evictable Pods based on priority. This also sorts them based on QoS. If there are multiple pods with same priority, they are sorted based on QoS tiers.
-			sortPodsBasedOnPriority(evictablePods)
-			evictPods(ctx, evictablePods, targetThresholds, nodeCapacity, node.usage, &totalPods, &totalCPU, &totalMem, taintsOfLowNodes, podEvictor, node.node)
-		} else {
-			// TODO: Remove this when we support only priority.
-			//  Falling back to evicting pods based on priority.
-			klog.V(1).Infof("Evicting pods based on QoS")
-			klog.V(1).Infof("There are %v non-evictable pods on the node", len(nonRemovablePods))
-			// evict best effort pods
-			evictPods(ctx, bestEffortPods, targetThresholds, nodeCapacity, node.usage, &totalPods, &totalCPU, &totalMem, taintsOfLowNodes, podEvictor, node.node)
-			// evict burstable pods
-			evictPods(ctx, burstablePods, targetThresholds, nodeCapacity, node.usage, &totalPods, &totalCPU, &totalMem, taintsOfLowNodes, podEvictor, node.node)
-			// evict guaranteed pods
-			evictPods(ctx, guaranteedPods, targetThresholds, nodeCapacity, node.usage, &totalPods, &totalCPU, &totalMem, taintsOfLowNodes, podEvictor, node.node)
-		}
-		klog.V(1).Infof("%v pods evicted from node %#v with usage %v", podEvictor.NodeEvicted(node.node), node.node.Name, node.usage)
-	}
-}
-
-func evictPods(
-	ctx context.Context,
-	inputPods []*v1.Pod,
-	targetThresholds api.ResourceThresholds,
-	nodeCapacity v1.ResourceList,
-	nodeUsage api.ResourceThresholds,
-	totalPods *float64,
-	totalCPU *float64,
-	totalMem *float64,
-	taintsOfLowNodes map[string][]v1.Taint,
-	podEvictor *evictions.PodEvictor,
-	node *v1.Node) {
-	if IsNodeAboveTargetUtilization(nodeUsage, targetThresholds) && (*totalPods > 0 || *totalCPU > 0 || *totalMem > 0) {
-		onePodPercentage := api.Percentage((float64(1) * 100) / float64(nodeCapacity.Pods().Value()))
-		for _, pod := range inputPods {
-			if !utils.PodToleratesTaints(pod, taintsOfLowNodes) {
-				klog.V(3).Infof("Skipping eviction for Pod: %#v, doesn't tolerate node taint", pod.Name)
-				continue
-			}
-
-			cUsage := utils.GetResourceRequest(pod, v1.ResourceCPU)
-			mUsage := utils.GetResourceRequest(pod, v1.ResourceMemory)
-
-			success, err := podEvictor.EvictPod(ctx, pod, node)
-			if err != nil {
-				klog.Errorf("Error evicting pod: (%#v)", err)
-				break
-			}
-
-			if success {
-				klog.V(3).Infof("Evicted pod: %#v", pod.Name)
-				// update remaining pods
-				nodeUsage[v1.ResourcePods] -= onePodPercentage
-				*totalPods--
-
-				// update remaining cpu
-				*totalCPU -= float64(cUsage)
-				nodeUsage[v1.ResourceCPU] -= api.Percentage((float64(cUsage) * 100) / float64(nodeCapacity.Cpu().MilliValue()))
-
-				// update remaining memory
-				*totalMem -= float64(mUsage)
-				nodeUsage[v1.ResourceMemory] -= api.Percentage(float64(mUsage) / float64(nodeCapacity.Memory().Value()) * 100)
-
-				klog.V(3).Infof("updated node usage: %#v", nodeUsage)
-				// check if node utilization drops below target threshold or required capacity (cpu, memory, pods) is moved
-				if !IsNodeAboveTargetUtilization(nodeUsage, targetThresholds) || (*totalPods <= 0 && *totalCPU <= 0 && *totalMem <= 0) {
-					break
-				}
-			}
-		}
-	}
-}
-
-func SortNodesByUsage(nodes []NodeUsageMap) {
-	sort.Slice(nodes, func(i, j int) bool {
-		var ti, tj api.Percentage
-		for name, value := range nodes[i].usage {
-			if name == v1.ResourceCPU || name == v1.ResourceMemory || name == v1.ResourcePods {
-				ti += value
-			}
-		}
-		for name, value := range nodes[j].usage {
-			if name == v1.ResourceCPU || name == v1.ResourceMemory || name == v1.ResourcePods {
-				tj += value
-			}
-		}
-		// To return sorted in descending order
-		return ti > tj
-	})
-}
-
-// sortPodsBasedOnPriority sorts pods based on priority and if their priorities are equal, they are sorted based on QoS tiers.
-func sortPodsBasedOnPriority(evictablePods []*v1.Pod) {
-	sort.Slice(evictablePods, func(i, j int) bool {
-		if evictablePods[i].Spec.Priority == nil && evictablePods[j].Spec.Priority != nil {
-			return true
-		}
-		if evictablePods[j].Spec.Priority == nil && evictablePods[i].Spec.Priority != nil {
-			return false
-		}
-		if (evictablePods[j].Spec.Priority == nil && evictablePods[i].Spec.Priority == nil) || (*evictablePods[i].Spec.Priority == *evictablePods[j].Spec.Priority) {
-			if podutil.IsBestEffortPod(evictablePods[i]) {
-				return true
-			}
-			if podutil.IsBurstablePod(evictablePods[i]) && podutil.IsGuaranteedPod(evictablePods[j]) {
-				return true
-			}
-			return false
-		}
-		return *evictablePods[i].Spec.Priority < *evictablePods[j].Spec.Priority
-	})
-}
-
-// createNodePodsMap returns nodepodsmap with evictable pods on node.
-func createNodePodsMap(ctx context.Context, client clientset.Interface, nodes []*v1.Node) NodePodsMap {
-	npm := NodePodsMap{}
-	for _, node := range nodes {
-		pods, err := podutil.ListPodsOnANode(ctx, client, node)
-		if err != nil {
-			klog.Warningf("node %s will not be processed, error in accessing its pods (%#v)", node.Name, err)
-		} else {
-			npm[node] = pods
-		}
-	}
-	return npm
-}
-
-func IsNodeAboveTargetUtilization(nodeThresholds api.ResourceThresholds, thresholds api.ResourceThresholds) bool {
-	for name, nodeValue := range nodeThresholds {
-		if name == v1.ResourceCPU || name == v1.ResourceMemory || name == v1.ResourcePods {
-			if value, ok := thresholds[name]; !ok {
-				continue
-			} else if nodeValue > value {
-				return true
-			}
-		}
-	}
-	return false
-}
-
-func IsNodeWithLowUtilization(nodeThresholds api.ResourceThresholds, thresholds api.ResourceThresholds) bool {
-	for name, nodeValue := range nodeThresholds {
-		if name == v1.ResourceCPU || name == v1.ResourceMemory || name == v1.ResourcePods {
-			if value, ok := thresholds[name]; !ok {
-				continue
-			} else if nodeValue > value {
-				return false
-			}
-		}
-	}
-	return true
-}
-
-func nodeUtilization(node *v1.Node, pods []*v1.Pod, evictLocalStoragePods bool) api.ResourceThresholds {
-	totalReqs := map[v1.ResourceName]*resource.Quantity{
-		v1.ResourceCPU:    {},
-		v1.ResourceMemory: {},
-	}
-	for _, pod := range pods {
-		req, _ := utils.PodRequestsAndLimits(pod)
-		for name, quantity := range req {
-			if name == v1.ResourceCPU || name == v1.ResourceMemory {
-				// As Quantity.Add says: Add adds the provided y quantity to the current value. If the current value is zero,
-				// the format of the quantity will be updated to the format of y.
-				totalReqs[name].Add(quantity)
-			}
-		}
-	}
-
-	nodeCapacity := node.Status.Capacity
-	if len(node.Status.Allocatable) > 0 {
-		nodeCapacity = node.Status.Allocatable
-	}
-
-	totalPods := len(pods)
-	return api.ResourceThresholds{
-		v1.ResourceCPU:    api.Percentage((float64(totalReqs[v1.ResourceCPU].MilliValue()) * 100) / float64(nodeCapacity.Cpu().MilliValue())),
-		v1.ResourceMemory: api.Percentage(float64(totalReqs[v1.ResourceMemory].Value()) / float64(nodeCapacity.Memory().Value()) * 100),
-		v1.ResourcePods:   api.Percentage((float64(totalPods) * 100) / float64(nodeCapacity.Pods().Value())),
-	}
-}
-
-func classifyPods(pods []*v1.Pod, evictLocalStoragePods bool) ([]*v1.Pod, []*v1.Pod, []*v1.Pod, []*v1.Pod) {
-	var nonRemovablePods, bestEffortPods, burstablePods, guaranteedPods []*v1.Pod
-
-	// From https://kubernetes.io/docs/tasks/configure-pod-container/quality-service-pod/
-	//
-	// For a Pod to be given a QoS class of Guaranteed:
-	// - every Container in the Pod must have a memory limit and a memory request, and they must be the same.
-	// - every Container in the Pod must have a CPU limit and a CPU request, and they must be the same.
-	// A Pod is given a QoS class of Burstable if:
-	// - the Pod does not meet the criteria for QoS class Guaranteed.
-	// - at least one Container in the Pod has a memory or CPU request.
-	// For a Pod to be given a QoS class of BestEffort, the Containers in the Pod must not have any memory or CPU limits or requests.
-
-	for _, pod := range pods {
-		if !podutil.IsEvictable(pod, evictLocalStoragePods) {
-			nonRemovablePods = append(nonRemovablePods, pod)
-			continue
-		}
-
-		switch utils.GetPodQOS(pod) {
-		case v1.PodQOSGuaranteed:
-			guaranteedPods = append(guaranteedPods, pod)
-		case v1.PodQOSBurstable:
-			burstablePods = append(burstablePods, pod)
-		default: // alias v1.PodQOSBestEffort
-			bestEffortPods = append(bestEffortPods, pod)
-		}
-	}
-
-	return nonRemovablePods, bestEffortPods, burstablePods, guaranteedPods
-}

pkg/descheduler/strategies/lownodeutilization_test.go

@@ -1,642 +0,0 @@
-/*
-Copyright 2017 The Kubernetes Authors.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package strategies
-
-import (
-	"context"
-	"fmt"
-	"strings"
-	"testing"
-
-	"reflect"
-
-	v1 "k8s.io/api/core/v1"
-	"k8s.io/api/policy/v1beta1"
-	"k8s.io/apimachinery/pkg/api/resource"
-	"k8s.io/apimachinery/pkg/fields"
-	"k8s.io/apimachinery/pkg/runtime"
-	"k8s.io/apimachinery/pkg/runtime/schema"
-	serializer "k8s.io/apimachinery/pkg/runtime/serializer"
-	"k8s.io/apimachinery/pkg/watch"
-	"k8s.io/client-go/kubernetes/fake"
-	core "k8s.io/client-go/testing"
-	"sigs.k8s.io/descheduler/pkg/api"
-	"sigs.k8s.io/descheduler/pkg/descheduler/evictions"
-	"sigs.k8s.io/descheduler/pkg/utils"
-	"sigs.k8s.io/descheduler/test"
-)
-
-var (
-	lowPriority  = int32(0)
-	highPriority = int32(10000)
-)
-
-func setRSOwnerRef(pod *v1.Pod)          { pod.ObjectMeta.OwnerReferences = test.GetReplicaSetOwnerRefList() }
-func setDSOwnerRef(pod *v1.Pod)          { pod.ObjectMeta.OwnerReferences = test.GetDaemonSetOwnerRefList() }
-func setNormalOwnerRef(pod *v1.Pod)      { pod.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList() }
-func setHighPriority(pod *v1.Pod)        { pod.Spec.Priority = &highPriority }
-func setLowPriority(pod *v1.Pod)         { pod.Spec.Priority = &lowPriority }
-func setNodeUnschedulable(node *v1.Node) { node.Spec.Unschedulable = true }
-
-func makeBestEffortPod(pod *v1.Pod) {
-	pod.Spec.Containers[0].Resources.Requests = nil
-	pod.Spec.Containers[0].Resources.Requests = nil
-	pod.Spec.Containers[0].Resources.Limits = nil
-	pod.Spec.Containers[0].Resources.Limits = nil
-}
-
-func makeBurstablePod(pod *v1.Pod) {
-	pod.Spec.Containers[0].Resources.Limits = nil
-	pod.Spec.Containers[0].Resources.Limits = nil
-}
-
-func makeGuaranteedPod(pod *v1.Pod) {
-	pod.Spec.Containers[0].Resources.Limits[v1.ResourceCPU] = pod.Spec.Containers[0].Resources.Requests[v1.ResourceCPU]
-	pod.Spec.Containers[0].Resources.Limits[v1.ResourceMemory] = pod.Spec.Containers[0].Resources.Requests[v1.ResourceMemory]
-}
-
-func TestLowNodeUtilization(t *testing.T) {
-	ctx := context.Background()
-	n1NodeName := "n1"
-	n2NodeName := "n2"
-	n3NodeName := "n3"
-
-	testCases := []struct {
-		name                         string
-		thresholds, targetThresholds api.ResourceThresholds
-		nodes                        map[string]*v1.Node
-		pods                         map[string]*v1.PodList
-		expectedPodsEvicted          int
-		evictedPods                  []string
-	}{
-		{
-			name: "without priorities",
-			thresholds: api.ResourceThresholds{
-				v1.ResourceCPU:  30,
-				v1.ResourcePods: 30,
-			},
-			targetThresholds: api.ResourceThresholds{
-				v1.ResourceCPU:  50,
-				v1.ResourcePods: 50,
-			},
-			nodes: map[string]*v1.Node{
-				n1NodeName: test.BuildTestNode(n1NodeName, 4000, 3000, 9, nil),
-				n2NodeName: test.BuildTestNode(n2NodeName, 4000, 3000, 10, nil),
-				n3NodeName: test.BuildTestNode(n3NodeName, 4000, 3000, 10, setNodeUnschedulable),
-			},
-			pods: map[string]*v1.PodList{
-				n1NodeName: {
-					Items: []v1.Pod{
-						*test.BuildTestPod("p1", 400, 0, n1NodeName, setRSOwnerRef),
-						*test.BuildTestPod("p2", 400, 0, n1NodeName, setRSOwnerRef),
-						*test.BuildTestPod("p3", 400, 0, n1NodeName, setRSOwnerRef),
-						*test.BuildTestPod("p4", 400, 0, n1NodeName, setRSOwnerRef),
-						*test.BuildTestPod("p5", 400, 0, n1NodeName, setRSOwnerRef),
-						// These won't be evicted.
-						*test.BuildTestPod("p6", 400, 0, n1NodeName, setDSOwnerRef),
-						*test.BuildTestPod("p7", 400, 0, n1NodeName, func(pod *v1.Pod) {
-							// A pod with local storage.
-							setNormalOwnerRef(pod)
-							pod.Spec.Volumes = []v1.Volume{
-								{
-									Name: "sample",
-									VolumeSource: v1.VolumeSource{
-										HostPath: &v1.HostPathVolumeSource{Path: "somePath"},
-										EmptyDir: &v1.EmptyDirVolumeSource{
-											SizeLimit: resource.NewQuantity(int64(10), resource.BinarySI)},
-									},
-								},
-							}
-							// A Mirror Pod.
-							pod.Annotations = test.GetMirrorPodAnnotation()
-						}),
-						*test.BuildTestPod("p8", 400, 0, n1NodeName, func(pod *v1.Pod) {
-							// A Critical Pod.
-							pod.Namespace = "kube-system"
-							priority := utils.SystemCriticalPriority
-							pod.Spec.Priority = &priority
-						}),
-					},
-				},
-				n2NodeName: {
-					Items: []v1.Pod{
-						*test.BuildTestPod("p9", 400, 0, n1NodeName, setRSOwnerRef),
-					},
-				},
-				n3NodeName: {},
-			},
-			expectedPodsEvicted: 3,
-		},
-		{
-			name: "with priorities",
-			thresholds: api.ResourceThresholds{
-				v1.ResourceCPU:  30,
-				v1.ResourcePods: 30,
-			},
-			targetThresholds: api.ResourceThresholds{
-				v1.ResourceCPU:  50,
-				v1.ResourcePods: 50,
-			},
-			nodes: map[string]*v1.Node{
-				n1NodeName: test.BuildTestNode(n1NodeName, 4000, 3000, 9, nil),
-				n2NodeName: test.BuildTestNode(n2NodeName, 4000, 3000, 10, nil),
-				n3NodeName: test.BuildTestNode(n3NodeName, 4000, 3000, 10, setNodeUnschedulable),
-			},
-			pods: map[string]*v1.PodList{
-				n1NodeName: {
-					Items: []v1.Pod{
-						*test.BuildTestPod("p1", 400, 0, n1NodeName, func(pod *v1.Pod) {
-							setRSOwnerRef(pod)
-							setHighPriority(pod)
-						}),
-						*test.BuildTestPod("p2", 400, 0, n1NodeName, func(pod *v1.Pod) {
-							setRSOwnerRef(pod)
-							setHighPriority(pod)
-						}),
-						*test.BuildTestPod("p3", 400, 0, n1NodeName, func(pod *v1.Pod) {
-							setRSOwnerRef(pod)
-							setHighPriority(pod)
-						}),
-						*test.BuildTestPod("p4", 400, 0, n1NodeName, func(pod *v1.Pod) {
-							setRSOwnerRef(pod)
-							setHighPriority(pod)
-						}),
-						*test.BuildTestPod("p5", 400, 0, n1NodeName, func(pod *v1.Pod) {
-							setRSOwnerRef(pod)
-							setLowPriority(pod)
-						}),
-						// These won't be evicted.
-						*test.BuildTestPod("p6", 400, 0, n1NodeName, func(pod *v1.Pod) {
-							setDSOwnerRef(pod)
-							setHighPriority(pod)
-						}),
-						*test.BuildTestPod("p7", 400, 0, n1NodeName, func(pod *v1.Pod) {
-							// A pod with local storage.
-							setNormalOwnerRef(pod)
-							setLowPriority(pod)
-							pod.Spec.Volumes = []v1.Volume{
-								{
-									Name: "sample",
-									VolumeSource: v1.VolumeSource{
-										HostPath: &v1.HostPathVolumeSource{Path: "somePath"},
-										EmptyDir: &v1.EmptyDirVolumeSource{
-											SizeLimit: resource.NewQuantity(int64(10), resource.BinarySI)},
-									},
-								},
-							}
-							// A Mirror Pod.
-							pod.Annotations = test.GetMirrorPodAnnotation()
-						}),
-						*test.BuildTestPod("p8", 400, 0, n1NodeName, func(pod *v1.Pod) {
-							// A Critical Pod.
-							pod.Namespace = "kube-system"
-							priority := utils.SystemCriticalPriority
-							pod.Spec.Priority = &priority
-						}),
-					},
-				},
-				n2NodeName: {
-					Items: []v1.Pod{
-						*test.BuildTestPod("p9", 400, 0, n1NodeName, setRSOwnerRef),
-					},
-				},
-				n3NodeName: {},
-			},
-			expectedPodsEvicted: 3,
-		},
-		{
-			name: "without priorities evicting best-effort pods only",
-			thresholds: api.ResourceThresholds{
-				v1.ResourceCPU:  30,
-				v1.ResourcePods: 30,
-			},
-			targetThresholds: api.ResourceThresholds{
-				v1.ResourceCPU:  50,
-				v1.ResourcePods: 50,
-			},
-			nodes: map[string]*v1.Node{
-				n1NodeName: test.BuildTestNode(n1NodeName, 4000, 3000, 9, nil),
-				n2NodeName: test.BuildTestNode(n2NodeName, 4000, 3000, 10, nil),
-				n3NodeName: test.BuildTestNode(n3NodeName, 4000, 3000, 10, setNodeUnschedulable),
-			},
-			// All pods are assumed to be burstable (test.BuildTestNode always sets both cpu/memory resource requests to some value)
-			pods: map[string]*v1.PodList{
-				n1NodeName: {
-					Items: []v1.Pod{
-						*test.BuildTestPod("p1", 400, 0, n1NodeName, func(pod *v1.Pod) {
-							setRSOwnerRef(pod)
-							makeBestEffortPod(pod)
-						}),
-						*test.BuildTestPod("p2", 400, 0, n1NodeName, func(pod *v1.Pod) {
-							setRSOwnerRef(pod)
-							makeBestEffortPod(pod)
-						}),
-						*test.BuildTestPod("p3", 400, 0, n1NodeName, func(pod *v1.Pod) {
-							setRSOwnerRef(pod)
-						}),
-						*test.BuildTestPod("p4", 400, 0, n1NodeName, func(pod *v1.Pod) {
-							setRSOwnerRef(pod)
-							makeBestEffortPod(pod)
-						}),
-						*test.BuildTestPod("p5", 400, 0, n1NodeName, func(pod *v1.Pod) {
-							setRSOwnerRef(pod)
-							makeBestEffortPod(pod)
-						}),
-						// These won't be evicted.
-						*test.BuildTestPod("p6", 400, 0, n1NodeName, func(pod *v1.Pod) {
-							setDSOwnerRef(pod)
-						}),
-						*test.BuildTestPod("p7", 400, 0, n1NodeName, func(pod *v1.Pod) {
-							// A pod with local storage.
-							setNormalOwnerRef(pod)
-							pod.Spec.Volumes = []v1.Volume{
-								{
-									Name: "sample",
-									VolumeSource: v1.VolumeSource{
-										HostPath: &v1.HostPathVolumeSource{Path: "somePath"},
-										EmptyDir: &v1.EmptyDirVolumeSource{
-											SizeLimit: resource.NewQuantity(int64(10), resource.BinarySI)},
-									},
-								},
-							}
-							// A Mirror Pod.
-							pod.Annotations = test.GetMirrorPodAnnotation()
-						}),
-						*test.BuildTestPod("p8", 400, 0, n1NodeName, func(pod *v1.Pod) {
-							// A Critical Pod.
-							pod.Namespace = "kube-system"
-							priority := utils.SystemCriticalPriority
-							pod.Spec.Priority = &priority
-						}),
-					},
-				},
-				n2NodeName: {
-					Items: []v1.Pod{
-						*test.BuildTestPod("p9", 400, 0, n1NodeName, setRSOwnerRef),
-					},
-				},
-				n3NodeName: {},
-			},
-			expectedPodsEvicted: 4,
-			evictedPods:         []string{"p1", "p2", "p4", "p5"},
-		},
-	}
-
-	for _, test := range testCases {
-		t.Run(test.name, func(t *testing.T) {
-			fakeClient := &fake.Clientset{}
-			fakeClient.Fake.AddReactor("list", "pods", func(action core.Action) (bool, runtime.Object, error) {
-				list := action.(core.ListAction)
-				fieldString := list.GetListRestrictions().Fields.String()
-				if strings.Contains(fieldString, n1NodeName) {
-					return true, test.pods[n1NodeName], nil
-				}
-				if strings.Contains(fieldString, n2NodeName) {
-					return true, test.pods[n2NodeName], nil
-				}
-				if strings.Contains(fieldString, n3NodeName) {
-					return true, test.pods[n3NodeName], nil
-				}
-				return true, nil, fmt.Errorf("Failed to list: %v", list)
-			})
-			fakeClient.Fake.AddReactor("get", "nodes", func(action core.Action) (bool, runtime.Object, error) {
-				getAction := action.(core.GetAction)
-				if node, exists := test.nodes[getAction.GetName()]; exists {
-					return true, node, nil
-				}
-				return true, nil, fmt.Errorf("Wrong node: %v", getAction.GetName())
-			})
-			podsForEviction := make(map[string]struct{})
-			for _, pod := range test.evictedPods {
-				podsForEviction[pod] = struct{}{}
-			}
-
-			evictionFailed := false
-			if len(test.evictedPods) > 0 {
-				fakeClient.Fake.AddReactor("create", "pods", func(action core.Action) (bool, runtime.Object, error) {
-					getAction := action.(core.CreateAction)
-					obj := getAction.GetObject()
-					if eviction, ok := obj.(*v1beta1.Eviction); ok {
-						if _, exists := podsForEviction[eviction.Name]; exists {
-							return true, obj, nil
-						}
-						evictionFailed = true
-						return true, nil, fmt.Errorf("pod %q was unexpectedly evicted", eviction.Name)
-					}
-					return true, obj, nil
-				})
-			}
-
-			var nodes []*v1.Node
-			for _, node := range test.nodes {
-				nodes = append(nodes, node)
-			}
-
-			npm := createNodePodsMap(ctx, fakeClient, nodes)
-			lowNodes, targetNodes := classifyNodes(npm, test.thresholds, test.targetThresholds, false)
-			if len(lowNodes) != 1 {
-				t.Errorf("After ignoring unschedulable nodes, expected only one node to be under utilized.")
-			}
-			podEvictor := evictions.NewPodEvictor(
-				fakeClient,
-				"v1",
-				false,
-				test.expectedPodsEvicted,
-				nodes,
-			)
-
-			evictPodsFromTargetNodes(ctx, targetNodes, lowNodes, test.targetThresholds, false, podEvictor)
-			podsEvicted := podEvictor.TotalEvicted()
-			if test.expectedPodsEvicted != podsEvicted {
-				t.Errorf("Expected %#v pods to be evicted but %#v got evicted", test.expectedPodsEvicted, podsEvicted)
-			}
-			if evictionFailed {
-				t.Errorf("Pod evictions failed unexpectedly")
-			}
-		})
-	}
-}
-
-func TestSortPodsByPriority(t *testing.T) {
-	n1 := test.BuildTestNode("n1", 4000, 3000, 9, nil)
-
-	p1 := test.BuildTestPod("p1", 400, 0, n1.Name, setLowPriority)
-
-	// BestEffort
-	p2 := test.BuildTestPod("p2", 400, 0, n1.Name, func(pod *v1.Pod) {
-		setHighPriority(pod)
-		makeBestEffortPod(pod)
-	})
-
-	// Burstable
-	p3 := test.BuildTestPod("p3", 400, 0, n1.Name, func(pod *v1.Pod) {
-		setHighPriority(pod)
-		makeBurstablePod(pod)
-	})
-
-	// Guaranteed
-	p4 := test.BuildTestPod("p4", 400, 100, n1.Name, func(pod *v1.Pod) {
-		setHighPriority(pod)
-		makeGuaranteedPod(pod)
-	})
-
-	// Best effort with nil priorities.
-	p5 := test.BuildTestPod("p5", 400, 100, n1.Name, makeBestEffortPod)
-	p5.Spec.Priority = nil
-
-	p6 := test.BuildTestPod("p6", 400, 100, n1.Name, makeGuaranteedPod)
-	p6.Spec.Priority = nil
-
-	podList := []*v1.Pod{p4, p3, p2, p1, p6, p5}
-
-	sortPodsBasedOnPriority(podList)
-	if !reflect.DeepEqual(podList[len(podList)-1], p4) {
-		t.Errorf("Expected last pod in sorted list to be %v which of highest priority and guaranteed but got %v", p4, podList[len(podList)-1])
-	}
-}
-
-func TestValidateThresholds(t *testing.T) {
-	tests := []struct {
-		name    string
-		input   api.ResourceThresholds
-		succeed bool
-	}{
-		{
-			name:    "passing nil map for threshold",
-			input:   nil,
-			succeed: false,
-		},
-		{
-			name:    "passing no threshold",
-			input:   api.ResourceThresholds{},
-			succeed: false,
-		},
-		{
-			name: "passing unsupported resource name",
-			input: api.ResourceThresholds{
-				v1.ResourceCPU:     40,
-				v1.ResourceStorage: 25.5,
-			},
-			succeed: false,
-		},
-		{
-			name: "passing invalid resource name",
-			input: api.ResourceThresholds{
-				v1.ResourceCPU: 40,
-				"coolResource": 42.0,
-			},
-			succeed: false,
-		},
-		{
-			name: "passing a valid threshold with cpu, memory and pods",
-			input: api.ResourceThresholds{
-				v1.ResourceCPU:    20,
-				v1.ResourceMemory: 30,
-				v1.ResourcePods:   40,
-			},
-			succeed: true,
-		},
-	}
-
-	for _, test := range tests {
-		isValid := validateThresholds(test.input)
-
-		if isValid != test.succeed {
-			t.Errorf("expected validity of threshold: %#v\nto be %v but got %v instead", test.input, test.succeed, isValid)
-		}
-	}
-}
-
-func newFake(objects ...runtime.Object) *core.Fake {
-	scheme := runtime.NewScheme()
-	codecs := serializer.NewCodecFactory(scheme)
-	fake.AddToScheme(scheme)
-	o := core.NewObjectTracker(scheme, codecs.UniversalDecoder())
-	for _, obj := range objects {
-		if err := o.Add(obj); err != nil {
-			panic(err)
-		}
-	}
-
-	fakePtr := core.Fake{}
-	fakePtr.AddReactor("list", "pods", func(action core.Action) (bool, runtime.Object, error) {
-		objs, err := o.List(
-			schema.GroupVersionResource{Group: "", Version: "v1", Resource: "pods"},
-			schema.GroupVersionKind{Group: "", Version: "v1", Kind: "Pod"},
-			action.GetNamespace(),
-		)
-		if err != nil {
-			return true, nil, err
-		}
-
-		obj := &v1.PodList{
-			Items: []v1.Pod{},
-		}
-		for _, pod := range objs.(*v1.PodList).Items {
-			podFieldSet := fields.Set(map[string]string{
-				"spec.nodeName": pod.Spec.NodeName,
-				"status.phase":  string(pod.Status.Phase),
-			})
-			match := action.(core.ListAction).GetListRestrictions().Fields.Matches(podFieldSet)
-			if !match {
-				continue
-			}
-			obj.Items = append(obj.Items, *pod.DeepCopy())
-		}
-		return true, obj, nil
-	})
-	fakePtr.AddReactor("*", "*", core.ObjectReaction(o))
-	fakePtr.AddWatchReactor("*", core.DefaultWatchReactor(watch.NewFake(), nil))
-
-	return &fakePtr
-}
-
-func TestWithTaints(t *testing.T) {
-	ctx := context.Background()
-	strategy := api.DeschedulerStrategy{
-		Enabled: true,
-		Params: api.StrategyParameters{
-			NodeResourceUtilizationThresholds: &api.NodeResourceUtilizationThresholds{
-				Thresholds: api.ResourceThresholds{
-					v1.ResourcePods: 20,
-				},
-				TargetThresholds: api.ResourceThresholds{
-					v1.ResourcePods: 70,
-				},
-			},
-		},
-	}
-
-	n1 := test.BuildTestNode("n1", 2000, 3000, 10, nil)
-	n2 := test.BuildTestNode("n2", 1000, 3000, 10, nil)
-	n3 := test.BuildTestNode("n3", 1000, 3000, 10, nil)
-	n3withTaints := n3.DeepCopy()
-	n3withTaints.Spec.Taints = []v1.Taint{
-		{
-			Key:    "key",
-			Value:  "value",
-			Effect: v1.TaintEffectNoSchedule,
-		},
-	}
-
-	podThatToleratesTaint := test.BuildTestPod("tolerate_pod", 200, 0, n1.Name, setRSOwnerRef)
-	podThatToleratesTaint.Spec.Tolerations = []v1.Toleration{
-		{
-			Key:   "key",
-			Value: "value",
-		},
-	}
-
-	tests := []struct {
-		name              string
-		nodes             []*v1.Node
-		pods              []*v1.Pod
-		evictionsExpected int
-	}{
-		{
-			name:  "No taints",
-			nodes: []*v1.Node{n1, n2, n3},
-			pods: []*v1.Pod{
-				//Node 1 pods
-				test.BuildTestPod(fmt.Sprintf("pod_1_%s", n1.Name), 200, 0, n1.Name, setRSOwnerRef),
-				test.BuildTestPod(fmt.Sprintf("pod_2_%s", n1.Name), 200, 0, n1.Name, setRSOwnerRef),
-				test.BuildTestPod(fmt.Sprintf("pod_3_%s", n1.Name), 200, 0, n1.Name, setRSOwnerRef),
-				test.BuildTestPod(fmt.Sprintf("pod_4_%s", n1.Name), 200, 0, n1.Name, setRSOwnerRef),
-				test.BuildTestPod(fmt.Sprintf("pod_5_%s", n1.Name), 200, 0, n1.Name, setRSOwnerRef),
-				test.BuildTestPod(fmt.Sprintf("pod_6_%s", n1.Name), 200, 0, n1.Name, setRSOwnerRef),
-				test.BuildTestPod(fmt.Sprintf("pod_7_%s", n1.Name), 200, 0, n1.Name, setRSOwnerRef),
-				test.BuildTestPod(fmt.Sprintf("pod_8_%s", n1.Name), 200, 0, n1.Name, setRSOwnerRef),
-				// Node 2 pods
-				test.BuildTestPod(fmt.Sprintf("pod_9_%s", n2.Name), 200, 0, n2.Name, setRSOwnerRef),
-			},
-			evictionsExpected: 1,
-		},
-		{
-			name:  "No pod tolerates node taint",
-			nodes: []*v1.Node{n1, n3withTaints},
-			pods: []*v1.Pod{
-				//Node 1 pods
-				test.BuildTestPod(fmt.Sprintf("pod_1_%s", n1.Name), 200, 0, n1.Name, setRSOwnerRef),
-				test.BuildTestPod(fmt.Sprintf("pod_2_%s", n1.Name), 200, 0, n1.Name, setRSOwnerRef),
-				test.BuildTestPod(fmt.Sprintf("pod_3_%s", n1.Name), 200, 0, n1.Name, setRSOwnerRef),
-				test.BuildTestPod(fmt.Sprintf("pod_4_%s", n1.Name), 200, 0, n1.Name, setRSOwnerRef),
-				test.BuildTestPod(fmt.Sprintf("pod_5_%s", n1.Name), 200, 0, n1.Name, setRSOwnerRef),
-				test.BuildTestPod(fmt.Sprintf("pod_6_%s", n1.Name), 200, 0, n1.Name, setRSOwnerRef),
-				test.BuildTestPod(fmt.Sprintf("pod_7_%s", n1.Name), 200, 0, n1.Name, setRSOwnerRef),
-				test.BuildTestPod(fmt.Sprintf("pod_8_%s", n1.Name), 200, 0, n1.Name, setRSOwnerRef),
-				// Node 3 pods
-				test.BuildTestPod(fmt.Sprintf("pod_9_%s", n3withTaints.Name), 200, 0, n3withTaints.Name, setRSOwnerRef),
-			},
-			evictionsExpected: 0,
-		},
-		{
-			name:  "Pod which tolerates node taint",
-			nodes: []*v1.Node{n1, n3withTaints},
-			pods: []*v1.Pod{
-				//Node 1 pods
-				test.BuildTestPod(fmt.Sprintf("pod_1_%s", n1.Name), 200, 0, n1.Name, setRSOwnerRef),
-				test.BuildTestPod(fmt.Sprintf("pod_2_%s", n1.Name), 200, 0, n1.Name, setRSOwnerRef),
-				test.BuildTestPod(fmt.Sprintf("pod_3_%s", n1.Name), 200, 0, n1.Name, setRSOwnerRef),
-				test.BuildTestPod(fmt.Sprintf("pod_4_%s", n1.Name), 200, 0, n1.Name, setRSOwnerRef),
-				test.BuildTestPod(fmt.Sprintf("pod_5_%s", n1.Name), 200, 0, n1.Name, setRSOwnerRef),
-				test.BuildTestPod(fmt.Sprintf("pod_6_%s", n1.Name), 200, 0, n1.Name, setRSOwnerRef),
-				test.BuildTestPod(fmt.Sprintf("pod_7_%s", n1.Name), 200, 0, n1.Name, setRSOwnerRef),
-				podThatToleratesTaint,
-				// Node 3 pods
-				test.BuildTestPod(fmt.Sprintf("pod_9_%s", n3withTaints.Name), 200, 0, n3withTaints.Name, setRSOwnerRef),
-			},
-			evictionsExpected: 1,
-		},
-	}
-
-	for _, item := range tests {
-		t.Run(item.name, func(t *testing.T) {
-			var objs []runtime.Object
-			for _, node := range item.nodes {
-				objs = append(objs, node)
-			}
-
-			for _, pod := range item.pods {
-				objs = append(objs, pod)
-			}
-
-			fakePtr := newFake(objs...)
-			var evictionCounter int
-			fakePtr.PrependReactor("create", "pods", func(action core.Action) (bool, runtime.Object, error) {
-				if action.GetSubresource() != "eviction" || action.GetResource().Resource != "pods" {
-					return false, nil, nil
-				}
-				evictionCounter++
-				return true, nil, nil
-			})
-
-			podEvictor := evictions.NewPodEvictor(
-				&fake.Clientset{Fake: *fakePtr},
-				"policy/v1",
-				false,
-				item.evictionsExpected,
-				item.nodes,
-			)
-
-			LowNodeUtilization(ctx, &fake.Clientset{Fake: *fakePtr}, strategy, item.nodes, false, podEvictor)
-
-			if item.evictionsExpected != evictionCounter {
-				t.Errorf("Expected %v evictions, got %v", item.evictionsExpected, evictionCounter)
-			}
-		})
-	}
-}

pkg/descheduler/strategies/node_affinity.go

@@ -18,46 +18,96 @@ package strategies
 
 import (
 	"context"
+	"fmt"
 
 	v1 "k8s.io/api/core/v1"
 	clientset "k8s.io/client-go/kubernetes"
-	"k8s.io/klog"
+	"k8s.io/klog/v2"
 
 	"sigs.k8s.io/descheduler/pkg/api"
 	"sigs.k8s.io/descheduler/pkg/descheduler/evictions"
 	nodeutil "sigs.k8s.io/descheduler/pkg/descheduler/node"
 	podutil "sigs.k8s.io/descheduler/pkg/descheduler/pod"
+	"sigs.k8s.io/descheduler/pkg/utils"
 )
 
-func RemovePodsViolatingNodeAffinity(ctx context.Context, client clientset.Interface, strategy api.DeschedulerStrategy, nodes []*v1.Node, evictLocalStoragePods bool, podEvictor *evictions.PodEvictor) {
+func validatePodsViolatingNodeAffinityParams(params *api.StrategyParameters) error {
+	if params == nil || len(params.NodeAffinityType) == 0 {
+		return fmt.Errorf("NodeAffinityType is empty")
+	}
+	// At most one of include/exclude can be set
+	if params.Namespaces != nil && len(params.Namespaces.Include) > 0 && len(params.Namespaces.Exclude) > 0 {
+		return fmt.Errorf("only one of Include/Exclude namespaces can be set")
+	}
+	if params.ThresholdPriority != nil && params.ThresholdPriorityClassName != "" {
+		return fmt.Errorf("only one of thresholdPriority and thresholdPriorityClassName can be set")
+	}
+
+	return nil
+}
+
+// RemovePodsViolatingNodeAffinity evicts pods on nodes which violate node affinity
+func RemovePodsViolatingNodeAffinity(ctx context.Context, client clientset.Interface, strategy api.DeschedulerStrategy, nodes []*v1.Node, podEvictor *evictions.PodEvictor) {
+	if err := validatePodsViolatingNodeAffinityParams(strategy.Params); err != nil {
+		klog.ErrorS(err, "Invalid RemovePodsViolatingNodeAffinity parameters")
+		return
+	}
+	thresholdPriority, err := utils.GetPriorityFromStrategyParams(ctx, client, strategy.Params)
+	if err != nil {
+		klog.ErrorS(err, "Failed to get threshold priority from strategy's params")
+		return
+	}
+
+	var includedNamespaces, excludedNamespaces []string
+	if strategy.Params.Namespaces != nil {
+		includedNamespaces = strategy.Params.Namespaces.Include
+		excludedNamespaces = strategy.Params.Namespaces.Exclude
+	}
+
+	nodeFit := false
+	if strategy.Params != nil {
+		nodeFit = strategy.Params.NodeFit
+	}
+
+	evictable := podEvictor.Evictable(evictions.WithPriorityThreshold(thresholdPriority), evictions.WithNodeFit(nodeFit))
+
 	for _, nodeAffinity := range strategy.Params.NodeAffinityType {
-		klog.V(2).Infof("Executing for nodeAffinityType: %v", nodeAffinity)
+		klog.V(2).InfoS("Executing for nodeAffinityType", "nodeAffinity", nodeAffinity)
 
 		switch nodeAffinity {
 		case "requiredDuringSchedulingIgnoredDuringExecution":
 			for _, node := range nodes {
-				klog.V(1).Infof("Processing node: %#v\n", node.Name)
+				klog.V(1).InfoS("Processing node", "node", klog.KObj(node))
 
-				pods, err := podutil.ListEvictablePodsOnNode(ctx, client, node, evictLocalStoragePods)
+				pods, err := podutil.ListPodsOnANode(
+					ctx,
+					client,
+					node,
+					podutil.WithFilter(func(pod *v1.Pod) bool {
+						return evictable.IsEvictable(pod) &&
+							!nodeutil.PodFitsCurrentNode(pod, node) &&
+							nodeutil.PodFitsAnyNode(pod, nodes)
+					}),
+					podutil.WithNamespaces(includedNamespaces),
+					podutil.WithoutNamespaces(excludedNamespaces),
+					podutil.WithLabelSelector(strategy.Params.LabelSelector),
+				)
 				if err != nil {
-					klog.Errorf("failed to get pods from %v: %v", node.Name, err)
+					klog.ErrorS(err, "Failed to get pods", "node", klog.KObj(node))
 				}
 
 				for _, pod := range pods {
 					if pod.Spec.Affinity != nil && pod.Spec.Affinity.NodeAffinity != nil && pod.Spec.Affinity.NodeAffinity.RequiredDuringSchedulingIgnoredDuringExecution != nil {
-						if !nodeutil.PodFitsCurrentNode(pod, node) && nodeutil.PodFitsAnyNode(pod, nodes) {
-							klog.V(1).Infof("Evicting pod: %v", pod.Name)
-							if _, err := podEvictor.EvictPod(ctx, pod, node); err != nil {
-								klog.Errorf("Error evicting pod: (%#v)", err)
-								break
-							}
+						klog.V(1).InfoS("Evicting pod", "pod", klog.KObj(pod))
+						if _, err := podEvictor.EvictPod(ctx, pod, node, "NodeAffinity"); err != nil {
+							klog.ErrorS(err, "Error evicting pod")
+							break
 						}
 					}
 				}
 			}
 		default:
-			klog.Errorf("invalid nodeAffinityType: %v", nodeAffinity)
+			klog.ErrorS(nil, "Invalid nodeAffinityType", "nodeAffinity", nodeAffinity)
 		}
 	}
-	klog.V(1).Infof("Evicted %v pods", podEvictor.TotalEvicted())
 }

pkg/descheduler/strategies/node_affinity_test.go

@@ -20,7 +20,8 @@ import (
 	"context"
 	"testing"
 
-	"k8s.io/api/core/v1"
+	v1 "k8s.io/api/core/v1"
+	policyv1 "k8s.io/api/policy/v1"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/client-go/kubernetes/fake"
 	core "k8s.io/client-go/testing"
@@ -33,13 +34,23 @@ func TestRemovePodsViolatingNodeAffinity(t *testing.T) {
 	ctx := context.Background()
 	requiredDuringSchedulingIgnoredDuringExecutionStrategy := api.DeschedulerStrategy{
 		Enabled: true,
-		Params: api.StrategyParameters{
+		Params: &api.StrategyParameters{
 			NodeAffinityType: []string{
 				"requiredDuringSchedulingIgnoredDuringExecution",
 			},
 		},
 	}
 
+	requiredDuringSchedulingIgnoredDuringExecutionWithNodeFitStrategy := api.DeschedulerStrategy{
+		Enabled: true,
+		Params: &api.StrategyParameters{
+			NodeAffinityType: []string{
+				"requiredDuringSchedulingIgnoredDuringExecution",
+			},
+			NodeFit: true,
+		},
+	}
+
 	nodeLabelKey := "kubernetes.io/desiredNode"
 	nodeLabelValue := "yes"
 	nodeWithLabels := test.BuildTestNode("nodeWithLabels", 2000, 3000, 10, nil)
@@ -93,13 +104,13 @@ func TestRemovePodsViolatingNodeAffinity(t *testing.T) {
 		pods                    []v1.Pod
 		strategy                api.DeschedulerStrategy
 		expectedEvictedPodCount int
-		maxPodsToEvict          int
+		maxPodsToEvictPerNode   int
 	}{
 		{
 			description: "Invalid strategy type, should not evict any pods",
 			strategy: api.DeschedulerStrategy{
 				Enabled: true,
-				Params: api.StrategyParameters{
+				Params: &api.StrategyParameters{
 					NodeAffinityType: []string{
 						"requiredDuringSchedulingRequiredDuringExecution",
 					},
@@ -108,7 +119,7 @@ func TestRemovePodsViolatingNodeAffinity(t *testing.T) {
 			expectedEvictedPodCount: 0,
 			pods:                    addPodsToNode(nodeWithoutLabels),
 			nodes:                   []*v1.Node{nodeWithoutLabels, nodeWithLabels},
-			maxPodsToEvict:          0,
+			maxPodsToEvictPerNode:   0,
 		},
 		{
 			description:             "Pod is correctly scheduled on node, no eviction expected",
@@ -116,7 +127,7 @@ func TestRemovePodsViolatingNodeAffinity(t *testing.T) {
 			expectedEvictedPodCount: 0,
 			pods:                    addPodsToNode(nodeWithLabels),
 			nodes:                   []*v1.Node{nodeWithLabels},
-			maxPodsToEvict:          0,
+			maxPodsToEvictPerNode:   0,
 		},
 		{
 			description:             "Pod is scheduled on node without matching labels, another schedulable node available, should be evicted",
@@ -124,23 +135,31 @@ func TestRemovePodsViolatingNodeAffinity(t *testing.T) {
 			strategy:                requiredDuringSchedulingIgnoredDuringExecutionStrategy,
 			pods:                    addPodsToNode(nodeWithoutLabels),
 			nodes:                   []*v1.Node{nodeWithoutLabels, nodeWithLabels},
-			maxPodsToEvict:          0,
+			maxPodsToEvictPerNode:   0,
 		},
 		{
-			description:             "Pod is scheduled on node without matching labels, another schedulable node available, maxPodsToEvict set to 1, should not be evicted",
+			description:             "Pod is scheduled on node without matching labels, another schedulable node available, maxPodsToEvictPerNode set to 1, should not be evicted",
 			expectedEvictedPodCount: 1,
 			strategy:                requiredDuringSchedulingIgnoredDuringExecutionStrategy,
 			pods:                    addPodsToNode(nodeWithoutLabels),
 			nodes:                   []*v1.Node{nodeWithoutLabels, nodeWithLabels},
-			maxPodsToEvict:          1,
+			maxPodsToEvictPerNode:   1,
 		},
 		{
 			description:             "Pod is scheduled on node without matching labels, but no node where pod fits is available, should not evict",
 			expectedEvictedPodCount: 0,
-			strategy:                requiredDuringSchedulingIgnoredDuringExecutionStrategy,
+			strategy:                requiredDuringSchedulingIgnoredDuringExecutionWithNodeFitStrategy,
 			pods:                    addPodsToNode(nodeWithoutLabels),
 			nodes:                   []*v1.Node{nodeWithoutLabels, unschedulableNodeWithLabels},
-			maxPodsToEvict:          0,
+			maxPodsToEvictPerNode:   0,
+		},
+		{
+			description:             "Pod is scheduled on node without matching labels, and node where pod fits is available, should evict",
+			expectedEvictedPodCount: 0,
+			strategy:                requiredDuringSchedulingIgnoredDuringExecutionWithNodeFitStrategy,
+			pods:                    addPodsToNode(nodeWithoutLabels),
+			nodes:                   []*v1.Node{nodeWithLabels, unschedulableNodeWithLabels},
+			maxPodsToEvictPerNode:   1,
 		},
 	}
 
@@ -153,13 +172,16 @@ func TestRemovePodsViolatingNodeAffinity(t *testing.T) {
 
 		podEvictor := evictions.NewPodEvictor(
 			fakeClient,
-			"v1",
+			policyv1.SchemeGroupVersion.String(),
 			false,
-			tc.maxPodsToEvict,
+			tc.maxPodsToEvictPerNode,
 			tc.nodes,
+			false,
+			false,
+			false,
 		)
 
-		RemovePodsViolatingNodeAffinity(ctx, fakeClient, tc.strategy, tc.nodes, false, podEvictor)
+		RemovePodsViolatingNodeAffinity(ctx, fakeClient, tc.strategy, tc.nodes, podEvictor)
 		actualEvictedPodCount := podEvictor.TotalEvicted()
 		if actualEvictedPodCount != tc.expectedEvictedPodCount {
 			t.Errorf("Test %#v failed, expected %v pod evictions, but got %v pod evictions\n", tc.description, tc.expectedEvictedPodCount, actualEvictedPodCount)

pkg/descheduler/strategies/node_taint.go

@@ -18,6 +18,7 @@ package strategies
 
 import (
 	"context"
+	"fmt"
 
 	"sigs.k8s.io/descheduler/pkg/api"
 	"sigs.k8s.io/descheduler/pkg/descheduler/evictions"
@@ -25,15 +26,68 @@ import (
 	"sigs.k8s.io/descheduler/pkg/utils"
 
 	v1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	clientset "k8s.io/client-go/kubernetes"
-	"k8s.io/klog"
+	"k8s.io/klog/v2"
 )
 
+func validateRemovePodsViolatingNodeTaintsParams(params *api.StrategyParameters) error {
+	if params == nil {
+		return nil
+	}
+
+	// At most one of include/exclude can be set
+	if params.Namespaces != nil && len(params.Namespaces.Include) > 0 && len(params.Namespaces.Exclude) > 0 {
+		return fmt.Errorf("only one of Include/Exclude namespaces can be set")
+	}
+	if params.ThresholdPriority != nil && params.ThresholdPriorityClassName != "" {
+		return fmt.Errorf("only one of thresholdPriority and thresholdPriorityClassName can be set")
+	}
+
+	return nil
+}
+
 // RemovePodsViolatingNodeTaints evicts pods on the node which violate NoSchedule Taints on nodes
-func RemovePodsViolatingNodeTaints(ctx context.Context, client clientset.Interface, strategy api.DeschedulerStrategy, nodes []*v1.Node, evictLocalStoragePods bool, podEvictor *evictions.PodEvictor) {
+func RemovePodsViolatingNodeTaints(ctx context.Context, client clientset.Interface, strategy api.DeschedulerStrategy, nodes []*v1.Node, podEvictor *evictions.PodEvictor) {
+	if err := validateRemovePodsViolatingNodeTaintsParams(strategy.Params); err != nil {
+		klog.ErrorS(err, "Invalid RemovePodsViolatingNodeTaints parameters")
+		return
+	}
+
+	var includedNamespaces, excludedNamespaces []string
+	var labelSelector *metav1.LabelSelector
+	if strategy.Params != nil {
+		if strategy.Params.Namespaces != nil {
+			includedNamespaces = strategy.Params.Namespaces.Include
+			excludedNamespaces = strategy.Params.Namespaces.Exclude
+		}
+		labelSelector = strategy.Params.LabelSelector
+	}
+
+	thresholdPriority, err := utils.GetPriorityFromStrategyParams(ctx, client, strategy.Params)
+	if err != nil {
+		klog.ErrorS(err, "Failed to get threshold priority from strategy's params")
+		return
+	}
+
+	nodeFit := false
+	if strategy.Params != nil {
+		nodeFit = strategy.Params.NodeFit
+	}
+
+	evictable := podEvictor.Evictable(evictions.WithPriorityThreshold(thresholdPriority), evictions.WithNodeFit(nodeFit))
+
 	for _, node := range nodes {
-		klog.V(1).Infof("Processing node: %#v\n", node.Name)
-		pods, err := podutil.ListEvictablePodsOnNode(ctx, client, node, evictLocalStoragePods)
+		klog.V(1).InfoS("Processing node", "node", klog.KObj(node))
+		pods, err := podutil.ListPodsOnANode(
+			ctx,
+			client,
+			node,
+			podutil.WithFilter(evictable.IsEvictable),
+			podutil.WithNamespaces(includedNamespaces),
+			podutil.WithoutNamespaces(excludedNamespaces),
+			podutil.WithLabelSelector(labelSelector),
+		)
 		if err != nil {
 			//no pods evicted as error encountered retrieving evictable Pods
 			return
@@ -45,9 +99,9 @@ func RemovePodsViolatingNodeTaints(ctx context.Context, client clientset.Interfa
 				node.Spec.Taints,
 				func(taint *v1.Taint) bool { return taint.Effect == v1.TaintEffectNoSchedule },
 			) {
-				klog.V(2).Infof("Not all taints with NoSchedule effect are tolerated after update for pod %v on node %v", pods[i].Name, node.Name)
-				if _, err := podEvictor.EvictPod(ctx, pods[i], node); err != nil {
-					klog.Errorf("Error evicting pod: (%#v)", err)
+				klog.V(2).InfoS("Not all taints with NoSchedule effect are tolerated after update for pod on node", "pod", klog.KObj(pods[i]), "node", klog.KObj(node))
+				if _, err := podEvictor.EvictPod(ctx, pods[i], node, "NodeTaint"); err != nil {
+					klog.ErrorS(err, "Error evicting pod")
 					break
 				}
 			}

pkg/descheduler/strategies/node_taint_test.go

@@ -5,7 +5,8 @@ import (
 	"fmt"
 	"testing"
 
-	"k8s.io/api/core/v1"
+	v1 "k8s.io/api/core/v1"
+	policyv1 "k8s.io/api/policy/v1"
 	"k8s.io/apimachinery/pkg/api/resource"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/client-go/kubernetes/fake"
@@ -50,6 +51,17 @@ func TestDeletePodsViolatingNodeTaints(t *testing.T) {
 	node2 := test.BuildTestNode("n2", 2000, 3000, 10, nil)
 	node1 = addTaintsToNode(node2, "testingTaint", "testing", []int{1})
 
+	node3 := test.BuildTestNode("n3", 2000, 3000, 10, func(node *v1.Node) {
+		node.ObjectMeta.Labels = map[string]string{
+			"datacenter": "east",
+		}
+	})
+	node4 := test.BuildTestNode("n4", 2000, 3000, 10, func(node *v1.Node) {
+		node.Spec = v1.NodeSpec{
+			Unschedulable: true,
+		}
+	})
+
 	p1 := test.BuildTestPod("p1", 100, 0, node1.Name, nil)
 	p2 := test.BuildTestPod("p2", 100, 0, node1.Name, nil)
 	p3 := test.BuildTestPod("p3", 100, 0, node1.Name, nil)
@@ -69,12 +81,15 @@ func TestDeletePodsViolatingNodeTaints(t *testing.T) {
 	p10 := test.BuildTestPod("p10", 100, 0, node2.Name, nil)
 	p11 := test.BuildTestPod("p11", 100, 0, node2.Name, nil)
 	p11.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
+	p12 := test.BuildTestPod("p11", 100, 0, node2.Name, nil)
+	p12.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
 
 	// The following 4 pods won't get evicted.
 	// A Critical Pod.
 	p7.Namespace = "kube-system"
 	priority := utils.SystemCriticalPriority
 	p7.Spec.Priority = &priority
+	p7.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
 
 	// A daemonset.
 	p8.ObjectMeta.OwnerReferences = test.GetDaemonSetOwnerRefList()
@@ -97,13 +112,19 @@ func TestDeletePodsViolatingNodeTaints(t *testing.T) {
 	p3 = addTolerationToPod(p3, "testTaint", "test", 1)
 	p4 = addTolerationToPod(p4, "testTaintX", "testX", 1)
 
+	p12.Spec.NodeSelector = map[string]string{
+		"datacenter": "west",
+	}
+
 	tests := []struct {
 		description             string
 		nodes                   []*v1.Node
 		pods                    []v1.Pod
 		evictLocalStoragePods   bool
-		maxPodsToEvict          int
+		evictSystemCriticalPods bool
+		maxPodsToEvictPerNode   int
 		expectedEvictedPodCount int
+		nodeFit                 bool
 	}{
 
 		{
@@ -111,7 +132,8 @@ func TestDeletePodsViolatingNodeTaints(t *testing.T) {
 			pods:                    []v1.Pod{*p1, *p2, *p3},
 			nodes:                   []*v1.Node{node1},
 			evictLocalStoragePods:   false,
-			maxPodsToEvict:          0,
+			evictSystemCriticalPods: false,
+			maxPodsToEvictPerNode:   0,
 			expectedEvictedPodCount: 1, //p2 gets evicted
 		},
 		{
@@ -119,15 +141,17 @@ func TestDeletePodsViolatingNodeTaints(t *testing.T) {
 			pods:                    []v1.Pod{*p1, *p3, *p4},
 			nodes:                   []*v1.Node{node1},
 			evictLocalStoragePods:   false,
-			maxPodsToEvict:          0,
+			evictSystemCriticalPods: false,
+			maxPodsToEvictPerNode:   0,
 			expectedEvictedPodCount: 1, //p4 gets evicted
 		},
 		{
-			description:             "Only <maxPodsToEvict> number of Pods not tolerating node taint should be evicted",
+			description:             "Only <maxPodsToEvictPerNode> number of Pods not tolerating node taint should be evicted",
 			pods:                    []v1.Pod{*p1, *p5, *p6},
 			nodes:                   []*v1.Node{node1},
 			evictLocalStoragePods:   false,
-			maxPodsToEvict:          1,
+			evictSystemCriticalPods: false,
+			maxPodsToEvictPerNode:   1,
 			expectedEvictedPodCount: 1, //p5 or p6 gets evicted
 		},
 		{
@@ -135,24 +159,66 @@ func TestDeletePodsViolatingNodeTaints(t *testing.T) {
 			pods:                    []v1.Pod{*p7, *p8, *p9, *p10},
 			nodes:                   []*v1.Node{node2},
 			evictLocalStoragePods:   false,
-			maxPodsToEvict:          0,
-			expectedEvictedPodCount: 0,
+			evictSystemCriticalPods: false,
+			maxPodsToEvictPerNode:   0,
+			expectedEvictedPodCount: 0, //nothing is evicted
 		},
 		{
 			description:             "Critical pods except storage pods not tolerating node taint should not be evicted",
 			pods:                    []v1.Pod{*p7, *p8, *p9, *p10},
 			nodes:                   []*v1.Node{node2},
 			evictLocalStoragePods:   true,
-			maxPodsToEvict:          0,
-			expectedEvictedPodCount: 1,
+			evictSystemCriticalPods: false,
+			maxPodsToEvictPerNode:   0,
+			expectedEvictedPodCount: 1, //p9 gets evicted
 		},
 		{
 			description:             "Critical and non critical pods, only non critical pods not tolerating node taint should be evicted",
 			pods:                    []v1.Pod{*p7, *p8, *p10, *p11},
 			nodes:                   []*v1.Node{node2},
 			evictLocalStoragePods:   false,
-			maxPodsToEvict:          0,
-			expectedEvictedPodCount: 1,
+			evictSystemCriticalPods: false,
+			maxPodsToEvictPerNode:   0,
+			expectedEvictedPodCount: 1, //p11 gets evicted
+		},
+		{
+			description:             "Critical and non critical pods, pods not tolerating node taint should be evicted even if they are critical",
+			pods:                    []v1.Pod{*p2, *p7, *p9, *p10},
+			nodes:                   []*v1.Node{node2},
+			evictLocalStoragePods:   false,
+			evictSystemCriticalPods: true,
+			maxPodsToEvictPerNode:   0,
+			expectedEvictedPodCount: 2, //p2 and p7 are evicted
+		},
+		{
+			description:             "Pod p2 doesn't tolerate taint on it's node, but also doesn't tolerate taints on other nodes",
+			pods:                    []v1.Pod{*p1, *p2, *p3},
+			nodes:                   []*v1.Node{node1, node2},
+			evictLocalStoragePods:   false,
+			evictSystemCriticalPods: false,
+			maxPodsToEvictPerNode:   0,
+			expectedEvictedPodCount: 0, //p2 gets evicted
+			nodeFit:                 true,
+		},
+		{
+			description:             "Pod p12 doesn't tolerate taint on it's node, but other nodes don't match it's selector",
+			pods:                    []v1.Pod{*p1, *p3, *p12},
+			nodes:                   []*v1.Node{node1, node3},
+			evictLocalStoragePods:   false,
+			evictSystemCriticalPods: false,
+			maxPodsToEvictPerNode:   0,
+			expectedEvictedPodCount: 0, //p2 gets evicted
+			nodeFit:                 true,
+		},
+		{
+			description:             "Pod p2 doesn't tolerate taint on it's node, but other nodes are unschedulable",
+			pods:                    []v1.Pod{*p1, *p2, *p3},
+			nodes:                   []*v1.Node{node1, node4},
+			evictLocalStoragePods:   false,
+			evictSystemCriticalPods: false,
+			maxPodsToEvictPerNode:   0,
+			expectedEvictedPodCount: 0, //p2 gets evicted
+			nodeFit:                 true,
 		},
 	}
 
@@ -166,13 +232,22 @@ func TestDeletePodsViolatingNodeTaints(t *testing.T) {
 
 		podEvictor := evictions.NewPodEvictor(
 			fakeClient,
-			"v1",
+			policyv1.SchemeGroupVersion.String(),
 			false,
-			tc.maxPodsToEvict,
+			tc.maxPodsToEvictPerNode,
 			tc.nodes,
+			tc.evictLocalStoragePods,
+			tc.evictSystemCriticalPods,
+			false,
 		)
 
-		RemovePodsViolatingNodeTaints(ctx, fakeClient, api.DeschedulerStrategy{}, tc.nodes, tc.evictLocalStoragePods, podEvictor)
+		strategy := api.DeschedulerStrategy{
+			Params: &api.StrategyParameters{
+				NodeFit: tc.nodeFit,
+			},
+		}
+
+		RemovePodsViolatingNodeTaints(ctx, fakeClient, strategy, tc.nodes, podEvictor)
 		actualEvictedPodCount := podEvictor.TotalEvicted()
 		if actualEvictedPodCount != tc.expectedEvictedPodCount {
 			t.Errorf("Test %#v failed, Unexpected no of pods evicted: pods evicted: %d, expected: %d", tc.description, actualEvictedPodCount, tc.expectedEvictedPodCount)

pkg/descheduler/strategies/nodeutilization/highnodeutilization.go

@@ -0,0 +1,164 @@
+/*
+Copyright 2021 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package nodeutilization
+
+import (
+	"context"
+	"fmt"
+
+	v1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/api/resource"
+	clientset "k8s.io/client-go/kubernetes"
+	"k8s.io/klog/v2"
+	"sigs.k8s.io/descheduler/pkg/api"
+	"sigs.k8s.io/descheduler/pkg/descheduler/evictions"
+	nodeutil "sigs.k8s.io/descheduler/pkg/descheduler/node"
+	"sigs.k8s.io/descheduler/pkg/utils"
+)
+
+// HighNodeUtilization evicts pods from under utilized nodes so that scheduler can schedule according to its strategy.
+// Note that CPU/Memory requests are used to calculate nodes' utilization and not the actual resource usage.
+func HighNodeUtilization(ctx context.Context, client clientset.Interface, strategy api.DeschedulerStrategy, nodes []*v1.Node, podEvictor *evictions.PodEvictor) {
+	if err := validateNodeUtilizationParams(strategy.Params); err != nil {
+		klog.ErrorS(err, "Invalid HighNodeUtilization parameters")
+		return
+	}
+
+	nodeFit := false
+	if strategy.Params != nil {
+		nodeFit = strategy.Params.NodeFit
+	}
+
+	thresholdPriority, err := utils.GetPriorityFromStrategyParams(ctx, client, strategy.Params)
+	if err != nil {
+		klog.ErrorS(err, "Failed to get threshold priority from strategy's params")
+		return
+	}
+
+	thresholds := strategy.Params.NodeResourceUtilizationThresholds.Thresholds
+	targetThresholds := strategy.Params.NodeResourceUtilizationThresholds.TargetThresholds
+	if err := validateHighUtilizationStrategyConfig(thresholds, targetThresholds); err != nil {
+		klog.ErrorS(err, "HighNodeUtilization config is not valid")
+		return
+	}
+	targetThresholds = make(api.ResourceThresholds)
+
+	setDefaultForThresholds(thresholds, targetThresholds)
+	resourceNames := getResourceNames(targetThresholds)
+
+	sourceNodes, highNodes := classifyNodes(
+		getNodeUsage(ctx, client, nodes, thresholds, targetThresholds, resourceNames),
+		func(node *v1.Node, usage NodeUsage) bool {
+			return isNodeWithLowUtilization(usage)
+		},
+		func(node *v1.Node, usage NodeUsage) bool {
+			if nodeutil.IsNodeUnschedulable(node) {
+				klog.V(2).InfoS("Node is unschedulable", "node", klog.KObj(node))
+				return false
+			}
+			return !isNodeWithLowUtilization(usage)
+		})
+
+	// log message in one line
+	keysAndValues := []interface{}{
+		"CPU", thresholds[v1.ResourceCPU],
+		"Mem", thresholds[v1.ResourceMemory],
+		"Pods", thresholds[v1.ResourcePods],
+	}
+	for name := range thresholds {
+		if !isBasicResource(name) {
+			keysAndValues = append(keysAndValues, string(name), int64(thresholds[name]))
+		}
+	}
+
+	klog.V(1).InfoS("Criteria for a node below target utilization", keysAndValues...)
+	klog.V(1).InfoS("Number of underutilized nodes", "totalNumber", len(sourceNodes))
+
+	if len(sourceNodes) == 0 {
+		klog.V(1).InfoS("No node is underutilized, nothing to do here, you might tune your thresholds further")
+		return
+	}
+	if len(sourceNodes) < strategy.Params.NodeResourceUtilizationThresholds.NumberOfNodes {
+		klog.V(1).InfoS("Number of nodes underutilized is less than NumberOfNodes, nothing to do here", "underutilizedNodes", len(sourceNodes), "numberOfNodes", strategy.Params.NodeResourceUtilizationThresholds.NumberOfNodes)
+		return
+	}
+	if len(sourceNodes) == len(nodes) {
+		klog.V(1).InfoS("All nodes are underutilized, nothing to do here")
+		return
+	}
+	if len(highNodes) == 0 {
+		klog.V(1).InfoS("No node is available to schedule the pods, nothing to do here")
+		return
+	}
+
+	evictable := podEvictor.Evictable(evictions.WithPriorityThreshold(thresholdPriority), evictions.WithNodeFit(nodeFit))
+
+	// stop if the total available usage has dropped to zero - no more pods can be scheduled
+	continueEvictionCond := func(nodeUsage NodeUsage, totalAvailableUsage map[v1.ResourceName]*resource.Quantity) bool {
+		for name := range totalAvailableUsage {
+			if totalAvailableUsage[name].CmpInt64(0) < 1 {
+				return false
+			}
+		}
+
+		return true
+	}
+	evictPodsFromSourceNodes(
+		ctx,
+		sourceNodes,
+		highNodes,
+		podEvictor,
+		evictable.IsEvictable,
+		resourceNames,
+		"HighNodeUtilization",
+		continueEvictionCond)
+
+}
+
+func validateHighUtilizationStrategyConfig(thresholds, targetThresholds api.ResourceThresholds) error {
+	if targetThresholds != nil {
+		return fmt.Errorf("targetThresholds is not applicable for HighNodeUtilization")
+	}
+	if err := validateThresholds(thresholds); err != nil {
+		return fmt.Errorf("thresholds config is not valid: %v", err)
+	}
+	return nil
+}
+
+func setDefaultForThresholds(thresholds, targetThresholds api.ResourceThresholds) {
+	// check if Pods/CPU/Mem are set, if not, set them to 100
+	if _, ok := thresholds[v1.ResourcePods]; !ok {
+		thresholds[v1.ResourcePods] = MaxResourcePercentage
+	}
+	if _, ok := thresholds[v1.ResourceCPU]; !ok {
+		thresholds[v1.ResourceCPU] = MaxResourcePercentage
+	}
+	if _, ok := thresholds[v1.ResourceMemory]; !ok {
+		thresholds[v1.ResourceMemory] = MaxResourcePercentage
+	}
+
+	// Default targetThreshold resource values to 100
+	targetThresholds[v1.ResourcePods] = MaxResourcePercentage
+	targetThresholds[v1.ResourceCPU] = MaxResourcePercentage
+	targetThresholds[v1.ResourceMemory] = MaxResourcePercentage
+
+	for name := range thresholds {
+		if !isBasicResource(name) {
+			targetThresholds[name] = MaxResourcePercentage
+		}
+	}
+}

pkg/descheduler/strategies/nodeutilization/highnodeutilization_test.go

@@ -0,0 +1,784 @@
+/*
+Copyright 2021 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package nodeutilization
+
+import (
+	"context"
+	"fmt"
+	"strings"
+	"testing"
+
+	v1 "k8s.io/api/core/v1"
+	"k8s.io/api/policy/v1beta1"
+	"k8s.io/apimachinery/pkg/api/resource"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/client-go/kubernetes/fake"
+	core "k8s.io/client-go/testing"
+	"sigs.k8s.io/descheduler/pkg/api"
+	"sigs.k8s.io/descheduler/pkg/descheduler/evictions"
+	"sigs.k8s.io/descheduler/pkg/utils"
+	"sigs.k8s.io/descheduler/test"
+)
+
+func TestHighNodeUtilization(t *testing.T) {
+	ctx := context.Background()
+	n1NodeName := "n1"
+	n2NodeName := "n2"
+	n3NodeName := "n3"
+
+	nodeSelectorKey := "datacenter"
+	nodeSelectorValue := "west"
+
+	testCases := []struct {
+		name                  string
+		thresholds            api.ResourceThresholds
+		nodes                 map[string]*v1.Node
+		pods                  map[string]*v1.PodList
+		maxPodsToEvictPerNode int
+		expectedPodsEvicted   int
+		evictedPods           []string
+	}{
+		{
+			name: "no node below threshold usage",
+			thresholds: api.ResourceThresholds{
+				v1.ResourceCPU:  20,
+				v1.ResourcePods: 20,
+			},
+			nodes: map[string]*v1.Node{
+				n1NodeName: test.BuildTestNode(n1NodeName, 4000, 3000, 10, nil),
+				n2NodeName: test.BuildTestNode(n2NodeName, 4000, 3000, 10, nil),
+				n3NodeName: test.BuildTestNode(n3NodeName, 4000, 3000, 10, nil),
+			},
+			pods: map[string]*v1.PodList{
+				n1NodeName: {
+					Items: []v1.Pod{
+						// These won't be evicted.
+						*test.BuildTestPod("p1", 400, 0, n1NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p2", 400, 0, n1NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p3", 400, 0, n1NodeName, test.SetRSOwnerRef),
+					},
+				},
+				n2NodeName: {
+					Items: []v1.Pod{
+						// These won't be evicted.
+						*test.BuildTestPod("p4", 400, 0, n2NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p5", 400, 0, n2NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p6", 400, 0, n2NodeName, test.SetRSOwnerRef),
+					},
+				},
+				n3NodeName: {
+					Items: []v1.Pod{
+						// These won't be evicted.
+						*test.BuildTestPod("p7", 400, 0, n3NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p8", 400, 0, n3NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p9", 400, 0, n3NodeName, test.SetRSOwnerRef),
+					},
+				},
+			},
+			maxPodsToEvictPerNode: 0,
+			expectedPodsEvicted:   0,
+		},
+		{
+			name: "no evictable pods",
+			thresholds: api.ResourceThresholds{
+				v1.ResourceCPU:  40,
+				v1.ResourcePods: 40,
+			},
+			nodes: map[string]*v1.Node{
+				n1NodeName: test.BuildTestNode(n1NodeName, 4000, 3000, 9, nil),
+				n2NodeName: test.BuildTestNode(n2NodeName, 4000, 3000, 10, nil),
+				n3NodeName: test.BuildTestNode(n3NodeName, 4000, 3000, 10, nil),
+			},
+			pods: map[string]*v1.PodList{
+				n1NodeName: {
+					Items: []v1.Pod{
+						// These won't be evicted.
+						*test.BuildTestPod("p1", 400, 0, n1NodeName, func(pod *v1.Pod) {
+							// A pod with local storage.
+							test.SetNormalOwnerRef(pod)
+							pod.Spec.Volumes = []v1.Volume{
+								{
+									Name: "sample",
+									VolumeSource: v1.VolumeSource{
+										HostPath: &v1.HostPathVolumeSource{Path: "somePath"},
+										EmptyDir: &v1.EmptyDirVolumeSource{
+											SizeLimit: resource.NewQuantity(int64(10), resource.BinarySI)},
+									},
+								},
+							}
+							// A Mirror Pod.
+							pod.Annotations = test.GetMirrorPodAnnotation()
+						}),
+						*test.BuildTestPod("p2", 400, 0, n1NodeName, func(pod *v1.Pod) {
+							// A Critical Pod.
+							pod.Namespace = "kube-system"
+							priority := utils.SystemCriticalPriority
+							pod.Spec.Priority = &priority
+						}),
+					},
+				},
+				n2NodeName: {
+					Items: []v1.Pod{
+						// These won't be evicted.
+						*test.BuildTestPod("p3", 400, 0, n2NodeName, test.SetDSOwnerRef),
+						*test.BuildTestPod("p4", 400, 0, n2NodeName, test.SetDSOwnerRef),
+					},
+				},
+				n3NodeName: {
+					Items: []v1.Pod{
+						*test.BuildTestPod("p5", 400, 0, n3NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p6", 400, 0, n3NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p7", 400, 0, n3NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p8", 400, 0, n3NodeName, test.SetRSOwnerRef),
+					},
+				},
+			},
+			maxPodsToEvictPerNode: 0,
+			expectedPodsEvicted:   0,
+		},
+		{
+			name: "no node to schedule evicted pods",
+			thresholds: api.ResourceThresholds{
+				v1.ResourceCPU:  20,
+				v1.ResourcePods: 20,
+			},
+			nodes: map[string]*v1.Node{
+				n1NodeName: test.BuildTestNode(n1NodeName, 4000, 3000, 10, nil),
+				n2NodeName: test.BuildTestNode(n2NodeName, 4000, 3000, 10, nil),
+				n3NodeName: test.BuildTestNode(n3NodeName, 4000, 3000, 10, test.SetNodeUnschedulable),
+			},
+			pods: map[string]*v1.PodList{
+				n1NodeName: {
+					Items: []v1.Pod{
+						// These can't be evicted.
+						*test.BuildTestPod("p1", 400, 0, n1NodeName, test.SetRSOwnerRef),
+					},
+				},
+				n2NodeName: {
+					Items: []v1.Pod{
+						// These can't be evicted.
+						*test.BuildTestPod("p2", 400, 0, n2NodeName, test.SetRSOwnerRef),
+					},
+				},
+				n3NodeName: {
+					Items: []v1.Pod{
+						*test.BuildTestPod("p3", 400, 0, n3NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p4", 400, 0, n3NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p5", 400, 0, n3NodeName, test.SetRSOwnerRef),
+					},
+				},
+			},
+			maxPodsToEvictPerNode: 0,
+			expectedPodsEvicted:   0,
+		},
+		{
+			name: "without priorities",
+			thresholds: api.ResourceThresholds{
+				v1.ResourceCPU:  30,
+				v1.ResourcePods: 30,
+			},
+			nodes: map[string]*v1.Node{
+				n1NodeName: test.BuildTestNode(n1NodeName, 4000, 3000, 10, nil),
+				n2NodeName: test.BuildTestNode(n2NodeName, 4000, 3000, 10, nil),
+				n3NodeName: test.BuildTestNode(n3NodeName, 4000, 3000, 10, test.SetNodeUnschedulable),
+			},
+			pods: map[string]*v1.PodList{
+				n1NodeName: {
+					Items: []v1.Pod{
+						*test.BuildTestPod("p1", 400, 0, n1NodeName, test.SetRSOwnerRef),
+						// These won't be evicted.
+						*test.BuildTestPod("p2", 400, 0, n1NodeName, func(pod *v1.Pod) {
+							// A Critical Pod.
+							pod.Namespace = "kube-system"
+							priority := utils.SystemCriticalPriority
+							pod.Spec.Priority = &priority
+						}),
+					},
+				},
+				n2NodeName: {
+					Items: []v1.Pod{
+						// These won't be evicted.
+						*test.BuildTestPod("p3", 400, 0, n2NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p4", 400, 0, n2NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p5", 400, 0, n2NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p6", 400, 0, n2NodeName, test.SetRSOwnerRef),
+					},
+				},
+				n3NodeName: {
+					Items: []v1.Pod{
+						*test.BuildTestPod("p7", 400, 0, n3NodeName, test.SetRSOwnerRef),
+					},
+				},
+			},
+			maxPodsToEvictPerNode: 0,
+			expectedPodsEvicted:   2,
+			evictedPods:           []string{"p1", "p7"},
+		},
+		{
+			name: "without priorities stop when resource capacity is depleted",
+			thresholds: api.ResourceThresholds{
+				v1.ResourceCPU:  30,
+				v1.ResourcePods: 30,
+			},
+			nodes: map[string]*v1.Node{
+				n1NodeName: test.BuildTestNode(n1NodeName, 2000, 3000, 10, nil),
+				n2NodeName: test.BuildTestNode(n2NodeName, 2000, 3000, 10, nil),
+				n3NodeName: test.BuildTestNode(n3NodeName, 2000, 3000, 10, test.SetNodeUnschedulable),
+			},
+			pods: map[string]*v1.PodList{
+				n1NodeName: {
+					Items: []v1.Pod{
+						*test.BuildTestPod("p1", 400, 0, n1NodeName, test.SetRSOwnerRef),
+					},
+				},
+				n2NodeName: {
+					Items: []v1.Pod{
+						// These won't be evicted.
+						*test.BuildTestPod("p2", 400, 0, n2NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p3", 400, 0, n2NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p4", 400, 0, n2NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p5", 400, 0, n2NodeName, test.SetRSOwnerRef),
+					},
+				},
+				n3NodeName: {
+					Items: []v1.Pod{
+						*test.BuildTestPod("p6", 400, 0, n3NodeName, test.SetRSOwnerRef),
+					},
+				},
+			},
+			maxPodsToEvictPerNode: 0,
+			expectedPodsEvicted:   1,
+		},
+		{
+			name: "with priorities",
+			thresholds: api.ResourceThresholds{
+				v1.ResourceCPU: 30,
+			},
+			nodes: map[string]*v1.Node{
+				n1NodeName: test.BuildTestNode(n1NodeName, 4000, 3000, 10, nil),
+				n2NodeName: test.BuildTestNode(n2NodeName, 2000, 3000, 10, nil),
+				n3NodeName: test.BuildTestNode(n3NodeName, 2000, 3000, 10, test.SetNodeUnschedulable),
+			},
+			pods: map[string]*v1.PodList{
+				n1NodeName: {
+					Items: []v1.Pod{
+						*test.BuildTestPod("p1", 400, 0, n1NodeName, func(pod *v1.Pod) {
+							test.SetRSOwnerRef(pod)
+							test.SetPodPriority(pod, lowPriority)
+						}),
+						*test.BuildTestPod("p2", 400, 0, n1NodeName, func(pod *v1.Pod) {
+							test.SetRSOwnerRef(pod)
+							test.SetPodPriority(pod, highPriority)
+						}),
+					},
+				},
+				n2NodeName: {
+					Items: []v1.Pod{
+						// These won't be evicted.
+						*test.BuildTestPod("p5", 400, 0, n2NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p6", 400, 0, n2NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p7", 400, 0, n2NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p8", 400, 0, n2NodeName, test.SetRSOwnerRef),
+					},
+				},
+				n3NodeName: {
+					Items: []v1.Pod{
+						// These won't be evicted.
+						*test.BuildTestPod("p9", 400, 0, n3NodeName, test.SetDSOwnerRef),
+					},
+				},
+			},
+			maxPodsToEvictPerNode: 0,
+			expectedPodsEvicted:   1,
+			evictedPods:           []string{"p1"},
+		},
+		{
+			name: "without priorities evicting best-effort pods only",
+			thresholds: api.ResourceThresholds{
+				v1.ResourceCPU: 30,
+			},
+			nodes: map[string]*v1.Node{
+				n1NodeName: test.BuildTestNode(n1NodeName, 3000, 3000, 10, nil),
+				n2NodeName: test.BuildTestNode(n2NodeName, 3000, 3000, 5, nil),
+				n3NodeName: test.BuildTestNode(n3NodeName, 3000, 3000, 10, test.SetNodeUnschedulable),
+			},
+			// All pods are assumed to be burstable (test.BuildTestNode always sets both cpu/memory resource requests to some value)
+			pods: map[string]*v1.PodList{
+				n1NodeName: {
+					Items: []v1.Pod{
+						*test.BuildTestPod("p1", 400, 0, n1NodeName, func(pod *v1.Pod) {
+							test.SetRSOwnerRef(pod)
+							test.MakeBestEffortPod(pod)
+						}),
+						*test.BuildTestPod("p2", 400, 0, n1NodeName, func(pod *v1.Pod) {
+							test.SetRSOwnerRef(pod)
+						}),
+					},
+				},
+				n2NodeName: {
+					Items: []v1.Pod{
+						// These won't be evicted.
+						*test.BuildTestPod("p3", 400, 0, n2NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p4", 400, 0, n2NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p5", 400, 0, n2NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p6", 400, 0, n2NodeName, test.SetRSOwnerRef),
+					},
+				},
+				n3NodeName: {
+					Items: []v1.Pod{},
+				},
+			},
+			maxPodsToEvictPerNode: 0,
+			expectedPodsEvicted:   1,
+			evictedPods:           []string{"p1"},
+		},
+		{
+			name: "with extended resource",
+			thresholds: api.ResourceThresholds{
+				v1.ResourceCPU:   20,
+				extendedResource: 40,
+			},
+			nodes: map[string]*v1.Node{
+				n1NodeName: test.BuildTestNode(n1NodeName, 4000, 3000, 10, func(node *v1.Node) {
+					test.SetNodeExtendedResource(node, extendedResource, 8)
+				}),
+				n2NodeName: test.BuildTestNode(n2NodeName, 4000, 3000, 10, func(node *v1.Node) {
+					test.SetNodeExtendedResource(node, extendedResource, 8)
+				}),
+				n3NodeName: test.BuildTestNode(n3NodeName, 4000, 3000, 10, test.SetNodeUnschedulable),
+			},
+			pods: map[string]*v1.PodList{
+				n1NodeName: {
+					Items: []v1.Pod{
+						*test.BuildTestPod("p1", 100, 0, n1NodeName, func(pod *v1.Pod) {
+							test.SetRSOwnerRef(pod)
+							test.SetPodExtendedResourceRequest(pod, extendedResource, 1)
+						}),
+						*test.BuildTestPod("p2", 100, 0, n1NodeName, func(pod *v1.Pod) {
+							test.SetRSOwnerRef(pod)
+							test.SetPodExtendedResourceRequest(pod, extendedResource, 1)
+						}),
+						// These won't be evicted
+						*test.BuildTestPod("p2", 100, 0, n1NodeName, func(pod *v1.Pod) {
+							test.SetDSOwnerRef(pod)
+							test.SetPodExtendedResourceRequest(pod, extendedResource, 1)
+						}),
+					},
+				},
+				n2NodeName: {
+					Items: []v1.Pod{
+						*test.BuildTestPod("p3", 500, 0, n2NodeName, func(pod *v1.Pod) {
+							test.SetRSOwnerRef(pod)
+							test.SetPodExtendedResourceRequest(pod, extendedResource, 1)
+						}),
+						*test.BuildTestPod("p4", 500, 0, n2NodeName, func(pod *v1.Pod) {
+							test.SetRSOwnerRef(pod)
+							test.SetPodExtendedResourceRequest(pod, extendedResource, 1)
+						}),
+						*test.BuildTestPod("p5", 500, 0, n2NodeName, func(pod *v1.Pod) {
+							test.SetRSOwnerRef(pod)
+							test.SetPodExtendedResourceRequest(pod, extendedResource, 1)
+						}),
+						*test.BuildTestPod("p6", 500, 0, n2NodeName, func(pod *v1.Pod) {
+							test.SetRSOwnerRef(pod)
+							test.SetPodExtendedResourceRequest(pod, extendedResource, 1)
+						}),
+					},
+				},
+				n3NodeName: {
+					Items: []v1.Pod{},
+				},
+			},
+			maxPodsToEvictPerNode: 0,
+			expectedPodsEvicted:   2,
+			evictedPods:           []string{"p1", "p2"},
+		},
+		{
+			name: "with extended resource in some of nodes",
+			thresholds: api.ResourceThresholds{
+				v1.ResourceCPU:   40,
+				extendedResource: 40,
+			},
+			nodes: map[string]*v1.Node{
+				n1NodeName: test.BuildTestNode(n1NodeName, 4000, 3000, 10, func(node *v1.Node) {
+					test.SetNodeExtendedResource(node, extendedResource, 8)
+				}),
+				n2NodeName: test.BuildTestNode(n2NodeName, 4000, 3000, 10, nil),
+				n3NodeName: test.BuildTestNode(n3NodeName, 4000, 3000, 10, test.SetNodeUnschedulable),
+			},
+			pods: map[string]*v1.PodList{
+				n1NodeName: {
+					Items: []v1.Pod{
+						//These won't be evicted
+						*test.BuildTestPod("p1", 100, 0, n1NodeName, func(pod *v1.Pod) {
+							test.SetRSOwnerRef(pod)
+							test.SetPodExtendedResourceRequest(pod, extendedResource, 1)
+						}),
+						*test.BuildTestPod("p2", 100, 0, n1NodeName, func(pod *v1.Pod) {
+							test.SetRSOwnerRef(pod)
+							test.SetPodExtendedResourceRequest(pod, extendedResource, 1)
+						}),
+					},
+				},
+				n2NodeName: {
+					Items: []v1.Pod{
+						*test.BuildTestPod("p3", 500, 0, n2NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p4", 500, 0, n2NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p5", 500, 0, n2NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p6", 500, 0, n2NodeName, test.SetRSOwnerRef),
+					},
+				},
+				n3NodeName: {
+					Items: []v1.Pod{},
+				},
+			},
+			maxPodsToEvictPerNode: 0,
+			expectedPodsEvicted:   0,
+		},
+		{
+			name: "Other node match pod node selector",
+			thresholds: api.ResourceThresholds{
+				v1.ResourceCPU:  30,
+				v1.ResourcePods: 30,
+			},
+			nodes: map[string]*v1.Node{
+				n1NodeName: test.BuildTestNode(n1NodeName, 4000, 3000, 9, func(node *v1.Node) {
+					node.ObjectMeta.Labels = map[string]string{
+						nodeSelectorKey: nodeSelectorValue,
+					}
+				}),
+				n2NodeName: test.BuildTestNode(n2NodeName, 4000, 3000, 10, nil),
+			},
+			pods: map[string]*v1.PodList{
+				n1NodeName: {
+					Items: []v1.Pod{
+						*test.BuildTestPod("p1", 400, 0, n1NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p2", 400, 0, n1NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p3", 400, 0, n1NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p4", 400, 0, n1NodeName, test.SetDSOwnerRef),
+					},
+				},
+				n2NodeName: {
+					Items: []v1.Pod{
+						*test.BuildTestPod("p5", 400, 0, n2NodeName, func(pod *v1.Pod) {
+							// A pod selecting nodes in the "west" datacenter
+							test.SetRSOwnerRef(pod)
+							pod.Spec.NodeSelector = map[string]string{
+								nodeSelectorKey: nodeSelectorValue,
+							}
+						}),
+					},
+				},
+			},
+			maxPodsToEvictPerNode: 0,
+			expectedPodsEvicted:   1,
+		},
+		{
+			name: "Other node does not match pod node selector",
+			thresholds: api.ResourceThresholds{
+				v1.ResourceCPU:  30,
+				v1.ResourcePods: 30,
+			},
+			nodes: map[string]*v1.Node{
+				n1NodeName: test.BuildTestNode(n1NodeName, 4000, 3000, 9, nil),
+				n2NodeName: test.BuildTestNode(n2NodeName, 4000, 3000, 10, nil),
+			},
+			pods: map[string]*v1.PodList{
+				n1NodeName: {
+					Items: []v1.Pod{
+						*test.BuildTestPod("p1", 400, 0, n1NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p2", 400, 0, n1NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p3", 400, 0, n1NodeName, test.SetRSOwnerRef),
+						*test.BuildTestPod("p4", 400, 0, n1NodeName, test.SetDSOwnerRef),
+					},
+				},
+				n2NodeName: {
+					Items: []v1.Pod{
+						*test.BuildTestPod("p5", 400, 0, n2NodeName, func(pod *v1.Pod) {
+							// A pod selecting nodes in the "west" datacenter
+							test.SetRSOwnerRef(pod)
+							pod.Spec.NodeSelector = map[string]string{
+								nodeSelectorKey: nodeSelectorValue,
+							}
+						}),
+					},
+				},
+			},
+			maxPodsToEvictPerNode: 0,
+			expectedPodsEvicted:   0,
+		},
+	}
+
+	for _, test := range testCases {
+		t.Run(test.name, func(t *testing.T) {
+			fakeClient := &fake.Clientset{}
+			fakeClient.Fake.AddReactor("list", "pods", func(action core.Action) (bool, runtime.Object, error) {
+				list := action.(core.ListAction)
+				fieldString := list.GetListRestrictions().Fields.String()
+				if strings.Contains(fieldString, n1NodeName) {
+					return true, test.pods[n1NodeName], nil
+				}
+				if strings.Contains(fieldString, n2NodeName) {
+					return true, test.pods[n2NodeName], nil
+				}
+				if strings.Contains(fieldString, n3NodeName) {
+					return true, test.pods[n3NodeName], nil
+				}
+				return true, nil, fmt.Errorf("Failed to list: %v", list)
+			})
+			fakeClient.Fake.AddReactor("get", "nodes", func(action core.Action) (bool, runtime.Object, error) {
+				getAction := action.(core.GetAction)
+				if node, exists := test.nodes[getAction.GetName()]; exists {
+					return true, node, nil
+				}
+				return true, nil, fmt.Errorf("Wrong node: %v", getAction.GetName())
+			})
+			podsForEviction := make(map[string]struct{})
+			for _, pod := range test.evictedPods {
+				podsForEviction[pod] = struct{}{}
+			}
+
+			evictionFailed := false
+			if len(test.evictedPods) > 0 {
+				fakeClient.Fake.AddReactor("create", "pods", func(action core.Action) (bool, runtime.Object, error) {
+					getAction := action.(core.CreateAction)
+					obj := getAction.GetObject()
+					if eviction, ok := obj.(*v1beta1.Eviction); ok {
+						if _, exists := podsForEviction[eviction.Name]; exists {
+							return true, obj, nil
+						}
+						evictionFailed = true
+						return true, nil, fmt.Errorf("pod %q was unexpectedly evicted", eviction.Name)
+					}
+					return true, obj, nil
+				})
+			}
+
+			var nodes []*v1.Node
+			for _, node := range test.nodes {
+				nodes = append(nodes, node)
+			}
+
+			podEvictor := evictions.NewPodEvictor(
+				fakeClient,
+				"v1",
+				false,
+				test.maxPodsToEvictPerNode,
+				nodes,
+				false,
+				false,
+				false,
+			)
+
+			strategy := api.DeschedulerStrategy{
+				Enabled: true,
+				Params: &api.StrategyParameters{
+					NodeResourceUtilizationThresholds: &api.NodeResourceUtilizationThresholds{
+						Thresholds: test.thresholds,
+					},
+					NodeFit: true,
+				},
+			}
+			HighNodeUtilization(ctx, fakeClient, strategy, nodes, podEvictor)
+
+			podsEvicted := podEvictor.TotalEvicted()
+			if test.expectedPodsEvicted != podsEvicted {
+				t.Errorf("Expected %#v pods to be evicted but %#v got evicted", test.expectedPodsEvicted, podsEvicted)
+			}
+			if evictionFailed {
+				t.Errorf("Pod evictions failed unexpectedly")
+			}
+		})
+	}
+}
+
+func TestValidateHighNodeUtilizationStrategyConfig(t *testing.T) {
+	tests := []struct {
+		name             string
+		thresholds       api.ResourceThresholds
+		targetThresholds api.ResourceThresholds
+		errInfo          error
+	}{
+		{
+			name: "passing target thresholds",
+			thresholds: api.ResourceThresholds{
+				v1.ResourceCPU:    20,
+				v1.ResourceMemory: 20,
+			},
+			targetThresholds: api.ResourceThresholds{
+				v1.ResourceCPU:    80,
+				v1.ResourceMemory: 80,
+			},
+			errInfo: fmt.Errorf("targetThresholds is not applicable for HighNodeUtilization"),
+		},
+		{
+			name:       "passing empty thresholds",
+			thresholds: api.ResourceThresholds{},
+			errInfo:    fmt.Errorf("thresholds config is not valid: no resource threshold is configured"),
+		},
+		{
+			name: "passing invalid thresholds",
+			thresholds: api.ResourceThresholds{
+				v1.ResourceCPU:    80,
+				v1.ResourceMemory: 120,
+			},
+			errInfo: fmt.Errorf("thresholds config is not valid: %v", fmt.Errorf(
+				"%v threshold not in [%v, %v] range", v1.ResourceMemory, MinResourcePercentage, MaxResourcePercentage)),
+		},
+		{
+			name: "passing valid strategy config",
+			thresholds: api.ResourceThresholds{
+				v1.ResourceCPU:    80,
+				v1.ResourceMemory: 80,
+			},
+			errInfo: nil,
+		},
+		{
+			name: "passing valid strategy config with extended resource",
+			thresholds: api.ResourceThresholds{
+				v1.ResourceCPU:    80,
+				v1.ResourceMemory: 80,
+				extendedResource:  80,
+			},
+			errInfo: nil,
+		},
+	}
+
+	for _, testCase := range tests {
+		validateErr := validateHighUtilizationStrategyConfig(testCase.thresholds, testCase.targetThresholds)
+
+		if validateErr == nil || testCase.errInfo == nil {
+			if validateErr != testCase.errInfo {
+				t.Errorf("expected validity of strategy config: thresholds %#v targetThresholds %#v to be %v but got %v instead",
+					testCase.thresholds, testCase.targetThresholds, testCase.errInfo, validateErr)
+			}
+		} else if validateErr.Error() != testCase.errInfo.Error() {
+			t.Errorf("expected validity of strategy config: thresholds %#v targetThresholds %#v to be %v but got %v instead",
+				testCase.thresholds, testCase.targetThresholds, testCase.errInfo, validateErr)
+		}
+	}
+}
+
+func TestHighNodeUtilizationWithTaints(t *testing.T) {
+	ctx := context.Background()
+	strategy := api.DeschedulerStrategy{
+		Enabled: true,
+		Params: &api.StrategyParameters{
+			NodeResourceUtilizationThresholds: &api.NodeResourceUtilizationThresholds{
+				Thresholds: api.ResourceThresholds{
+					v1.ResourceCPU: 40,
+				},
+			},
+		},
+	}
+
+	n1 := test.BuildTestNode("n1", 1000, 3000, 10, nil)
+	n2 := test.BuildTestNode("n2", 1000, 3000, 10, nil)
+	n3 := test.BuildTestNode("n3", 1000, 3000, 10, nil)
+	n3withTaints := n3.DeepCopy()
+	n3withTaints.Spec.Taints = []v1.Taint{
+		{
+			Key:    "key",
+			Value:  "value",
+			Effect: v1.TaintEffectNoSchedule,
+		},
+	}
+
+	podThatToleratesTaint := test.BuildTestPod("tolerate_pod", 200, 0, n1.Name, test.SetRSOwnerRef)
+	podThatToleratesTaint.Spec.Tolerations = []v1.Toleration{
+		{
+			Key:   "key",
+			Value: "value",
+		},
+	}
+
+	tests := []struct {
+		name              string
+		nodes             []*v1.Node
+		pods              []*v1.Pod
+		evictionsExpected int
+	}{
+		{
+			name:  "No taints",
+			nodes: []*v1.Node{n1, n2, n3},
+			pods: []*v1.Pod{
+				//Node 1 pods
+				test.BuildTestPod(fmt.Sprintf("pod_1_%s", n1.Name), 200, 0, n1.Name, test.SetRSOwnerRef),
+				test.BuildTestPod(fmt.Sprintf("pod_2_%s", n1.Name), 200, 0, n1.Name, test.SetRSOwnerRef),
+				test.BuildTestPod(fmt.Sprintf("pod_3_%s", n1.Name), 200, 0, n1.Name, test.SetRSOwnerRef),
+				// Node 2 pods
+				test.BuildTestPod(fmt.Sprintf("pod_4_%s", n2.Name), 200, 0, n2.Name, test.SetRSOwnerRef),
+			},
+			evictionsExpected: 1,
+		},
+		{
+			name:  "No pod tolerates node taint",
+			nodes: []*v1.Node{n1, n3withTaints},
+			pods: []*v1.Pod{
+				//Node 1 pods
+				test.BuildTestPod(fmt.Sprintf("pod_1_%s", n1.Name), 200, 0, n1.Name, test.SetRSOwnerRef),
+				// Node 3 pods
+				test.BuildTestPod(fmt.Sprintf("pod_2_%s", n3withTaints.Name), 200, 0, n3withTaints.Name, test.SetRSOwnerRef),
+			},
+			evictionsExpected: 0,
+		},
+		{
+			name:  "Pod which tolerates node taint",
+			nodes: []*v1.Node{n1, n3withTaints},
+			pods: []*v1.Pod{
+				//Node 1 pods
+				test.BuildTestPod(fmt.Sprintf("pod_1_%s", n1.Name), 100, 0, n1.Name, test.SetRSOwnerRef),
+				podThatToleratesTaint,
+				// Node 3 pods
+				test.BuildTestPod(fmt.Sprintf("pod_9_%s", n3withTaints.Name), 500, 0, n3withTaints.Name, test.SetRSOwnerRef),
+			},
+			evictionsExpected: 1,
+		},
+	}
+
+	for _, item := range tests {
+		t.Run(item.name, func(t *testing.T) {
+			var objs []runtime.Object
+			for _, node := range item.nodes {
+				objs = append(objs, node)
+			}
+
+			for _, pod := range item.pods {
+				objs = append(objs, pod)
+			}
+
+			fakeClient := fake.NewSimpleClientset(objs...)
+
+			podEvictor := evictions.NewPodEvictor(
+				fakeClient,
+				"policy/v1",
+				false,
+				item.evictionsExpected,
+				item.nodes,
+				false,
+				false,
+				false,
+			)
+
+			HighNodeUtilization(ctx, fakeClient, strategy, item.nodes, podEvictor)
+
+			if item.evictionsExpected != podEvictor.TotalEvicted() {
+				t.Errorf("Expected %v evictions, got %v", item.evictionsExpected, podEvictor.TotalEvicted())
+			}
+		})
+	}
+}

pkg/descheduler/strategies/nodeutilization/lownodeutilization.go

@@ -0,0 +1,187 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package nodeutilization
+
+import (
+	"context"
+	"fmt"
+	v1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/api/resource"
+	clientset "k8s.io/client-go/kubernetes"
+	"k8s.io/klog/v2"
+
+	"sigs.k8s.io/descheduler/pkg/api"
+	"sigs.k8s.io/descheduler/pkg/descheduler/evictions"
+	nodeutil "sigs.k8s.io/descheduler/pkg/descheduler/node"
+	"sigs.k8s.io/descheduler/pkg/utils"
+)
+
+// LowNodeUtilization evicts pods from overutilized nodes to underutilized nodes. Note that CPU/Memory requests are used
+// to calculate nodes' utilization and not the actual resource usage.
+func LowNodeUtilization(ctx context.Context, client clientset.Interface, strategy api.DeschedulerStrategy, nodes []*v1.Node, podEvictor *evictions.PodEvictor) {
+	// TODO: May be create a struct for the strategy as well, so that we don't have to pass along the all the params?
+	if err := validateNodeUtilizationParams(strategy.Params); err != nil {
+		klog.ErrorS(err, "Invalid LowNodeUtilization parameters")
+		return
+	}
+	thresholdPriority, err := utils.GetPriorityFromStrategyParams(ctx, client, strategy.Params)
+	if err != nil {
+		klog.ErrorS(err, "Failed to get threshold priority from strategy's params")
+		return
+	}
+
+	nodeFit := false
+	if strategy.Params != nil {
+		nodeFit = strategy.Params.NodeFit
+	}
+
+	thresholds := strategy.Params.NodeResourceUtilizationThresholds.Thresholds
+	targetThresholds := strategy.Params.NodeResourceUtilizationThresholds.TargetThresholds
+	if err := validateLowUtilizationStrategyConfig(thresholds, targetThresholds); err != nil {
+		klog.ErrorS(err, "LowNodeUtilization config is not valid")
+		return
+	}
+	// check if Pods/CPU/Mem are set, if not, set them to 100
+	if _, ok := thresholds[v1.ResourcePods]; !ok {
+		thresholds[v1.ResourcePods] = MaxResourcePercentage
+		targetThresholds[v1.ResourcePods] = MaxResourcePercentage
+	}
+	if _, ok := thresholds[v1.ResourceCPU]; !ok {
+		thresholds[v1.ResourceCPU] = MaxResourcePercentage
+		targetThresholds[v1.ResourceCPU] = MaxResourcePercentage
+	}
+	if _, ok := thresholds[v1.ResourceMemory]; !ok {
+		thresholds[v1.ResourceMemory] = MaxResourcePercentage
+		targetThresholds[v1.ResourceMemory] = MaxResourcePercentage
+	}
+	resourceNames := getResourceNames(thresholds)
+
+	lowNodes, sourceNodes := classifyNodes(
+		getNodeUsage(ctx, client, nodes, thresholds, targetThresholds, resourceNames),
+		// The node has to be schedulable (to be able to move workload there)
+		func(node *v1.Node, usage NodeUsage) bool {
+			if nodeutil.IsNodeUnschedulable(node) {
+				klog.V(2).InfoS("Node is unschedulable, thus not considered as underutilized", "node", klog.KObj(node))
+				return false
+			}
+			return isNodeWithLowUtilization(usage)
+		},
+		func(node *v1.Node, usage NodeUsage) bool {
+			return isNodeAboveTargetUtilization(usage)
+		},
+	)
+
+	// log message in one line
+	keysAndValues := []interface{}{
+		"CPU", thresholds[v1.ResourceCPU],
+		"Mem", thresholds[v1.ResourceMemory],
+		"Pods", thresholds[v1.ResourcePods],
+	}
+	for name := range thresholds {
+		if !isBasicResource(name) {
+			keysAndValues = append(keysAndValues, string(name), int64(thresholds[name]))
+		}
+	}
+	klog.V(1).InfoS("Criteria for a node under utilization", keysAndValues...)
+	klog.V(1).InfoS("Number of underutilized nodes", "totalNumber", len(lowNodes))
+
+	// log message in one line
+	keysAndValues = []interface{}{
+		"CPU", targetThresholds[v1.ResourceCPU],
+		"Mem", targetThresholds[v1.ResourceMemory],
+		"Pods", targetThresholds[v1.ResourcePods],
+	}
+	for name := range targetThresholds {
+		if !isBasicResource(name) {
+			keysAndValues = append(keysAndValues, string(name), int64(targetThresholds[name]))
+		}
+	}
+	klog.V(1).InfoS("Criteria for a node above target utilization", keysAndValues...)
+	klog.V(1).InfoS("Number of overutilized nodes", "totalNumber", len(sourceNodes))
+
+	if len(lowNodes) == 0 {
+		klog.V(1).InfoS("No node is underutilized, nothing to do here, you might tune your thresholds further")
+		return
+	}
+
+	if len(lowNodes) < strategy.Params.NodeResourceUtilizationThresholds.NumberOfNodes {
+		klog.V(1).InfoS("Number of nodes underutilized is less than NumberOfNodes, nothing to do here", "underutilizedNodes", len(lowNodes), "numberOfNodes", strategy.Params.NodeResourceUtilizationThresholds.NumberOfNodes)
+		return
+	}
+
+	if len(lowNodes) == len(nodes) {
+		klog.V(1).InfoS("All nodes are underutilized, nothing to do here")
+		return
+	}
+
+	if len(sourceNodes) == 0 {
+		klog.V(1).InfoS("All nodes are under target utilization, nothing to do here")
+		return
+	}
+
+	evictable := podEvictor.Evictable(evictions.WithPriorityThreshold(thresholdPriority), evictions.WithNodeFit(nodeFit))
+
+	// stop if node utilization drops below target threshold or any of required capacity (cpu, memory, pods) is moved
+	continueEvictionCond := func(nodeUsage NodeUsage, totalAvailableUsage map[v1.ResourceName]*resource.Quantity) bool {
+		if !isNodeAboveTargetUtilization(nodeUsage) {
+			return false
+		}
+		for name := range totalAvailableUsage {
+			if totalAvailableUsage[name].CmpInt64(0) < 1 {
+				return false
+			}
+		}
+
+		return true
+	}
+
+	evictPodsFromSourceNodes(
+		ctx,
+		sourceNodes,
+		lowNodes,
+		podEvictor,
+		evictable.IsEvictable,
+		resourceNames,
+		"LowNodeUtilization",
+		continueEvictionCond)
+
+	klog.V(1).InfoS("Total number of pods evicted", "evictedPods", podEvictor.TotalEvicted())
+}
+
+// validateLowUtilizationStrategyConfig checks if the strategy's config is valid
+func validateLowUtilizationStrategyConfig(thresholds, targetThresholds api.ResourceThresholds) error {
+	// validate thresholds and targetThresholds config
+	if err := validateThresholds(thresholds); err != nil {
+		return fmt.Errorf("thresholds config is not valid: %v", err)
+	}
+	if err := validateThresholds(targetThresholds); err != nil {
+		return fmt.Errorf("targetThresholds config is not valid: %v", err)
+	}
+
+	// validate if thresholds and targetThresholds have same resources configured
+	if len(thresholds) != len(targetThresholds) {
+		return fmt.Errorf("thresholds and targetThresholds configured different resources")
+	}
+	for resourceName, value := range thresholds {
+		if targetValue, ok := targetThresholds[resourceName]; !ok {
+			return fmt.Errorf("thresholds and targetThresholds configured different resources")
+		} else if value > targetValue {
+			return fmt.Errorf("thresholds' %v percentage is greater than targetThresholds'", resourceName)
+		}
+	}
+	return nil
+}

pkg/descheduler/strategies/nodeutilization/nodeutilization.go

@@ -0,0 +1,406 @@
+/*
+Copyright 2021 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package nodeutilization
+
+import (
+	"context"
+	"fmt"
+	v1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/api/resource"
+	clientset "k8s.io/client-go/kubernetes"
+	"k8s.io/klog/v2"
+	"sigs.k8s.io/descheduler/pkg/api"
+	"sigs.k8s.io/descheduler/pkg/descheduler/evictions"
+	podutil "sigs.k8s.io/descheduler/pkg/descheduler/pod"
+	"sigs.k8s.io/descheduler/pkg/utils"
+	"sort"
+)
+
+// NodeUsage stores a node's info, pods on it, thresholds and its resource usage
+type NodeUsage struct {
+	node    *v1.Node
+	usage   map[v1.ResourceName]*resource.Quantity
+	allPods []*v1.Pod
+
+	lowResourceThreshold  map[v1.ResourceName]*resource.Quantity
+	highResourceThreshold map[v1.ResourceName]*resource.Quantity
+}
+
+type continueEvictionCond func(nodeUsage NodeUsage, totalAvailableUsage map[v1.ResourceName]*resource.Quantity) bool
+
+// NodePodsMap is a set of (node, pods) pairs
+type NodePodsMap map[*v1.Node][]*v1.Pod
+
+const (
+	// MinResourcePercentage is the minimum value of a resource's percentage
+	MinResourcePercentage = 0
+	// MaxResourcePercentage is the maximum value of a resource's percentage
+	MaxResourcePercentage = 100
+)
+
+func validateNodeUtilizationParams(params *api.StrategyParameters) error {
+	if params == nil || params.NodeResourceUtilizationThresholds == nil {
+		return fmt.Errorf("NodeResourceUtilizationThresholds not set")
+	}
+	if params.ThresholdPriority != nil && params.ThresholdPriorityClassName != "" {
+		return fmt.Errorf("only one of thresholdPriority and thresholdPriorityClassName can be set")
+	}
+
+	return nil
+}
+
+// validateThresholds checks if thresholds have valid resource name and resource percentage configured
+func validateThresholds(thresholds api.ResourceThresholds) error {
+	if thresholds == nil || len(thresholds) == 0 {
+		return fmt.Errorf("no resource threshold is configured")
+	}
+	for name, percent := range thresholds {
+		if percent < MinResourcePercentage || percent > MaxResourcePercentage {
+			return fmt.Errorf("%v threshold not in [%v, %v] range", name, MinResourcePercentage, MaxResourcePercentage)
+		}
+	}
+	return nil
+}
+
+func getNodeUsage(
+	ctx context.Context,
+	client clientset.Interface,
+	nodes []*v1.Node,
+	lowThreshold, highThreshold api.ResourceThresholds,
+	resourceNames []v1.ResourceName,
+) []NodeUsage {
+	var nodeUsageList []NodeUsage
+
+	for _, node := range nodes {
+		pods, err := podutil.ListPodsOnANode(ctx, client, node)
+		if err != nil {
+			klog.V(2).InfoS("Node will not be processed, error accessing its pods", "node", klog.KObj(node), "err", err)
+			continue
+		}
+
+		// A threshold is in percentages but in <0;100> interval.
+		// Performing `threshold * 0.01` will convert <0;100> interval into <0;1>.
+		// Multiplying it with capacity will give fraction of the capacity corresponding to the given high/low resource threshold in Quantity units.
+		nodeCapacity := node.Status.Capacity
+		if len(node.Status.Allocatable) > 0 {
+			nodeCapacity = node.Status.Allocatable
+		}
+		lowResourceThreshold := map[v1.ResourceName]*resource.Quantity{
+			v1.ResourceCPU:    resource.NewMilliQuantity(int64(float64(lowThreshold[v1.ResourceCPU])*float64(nodeCapacity.Cpu().MilliValue())*0.01), resource.DecimalSI),
+			v1.ResourceMemory: resource.NewQuantity(int64(float64(lowThreshold[v1.ResourceMemory])*float64(nodeCapacity.Memory().Value())*0.01), resource.BinarySI),
+			v1.ResourcePods:   resource.NewQuantity(int64(float64(lowThreshold[v1.ResourcePods])*float64(nodeCapacity.Pods().Value())*0.01), resource.DecimalSI),
+		}
+		for _, name := range resourceNames {
+			if !isBasicResource(name) {
+				cap := nodeCapacity[name]
+				lowResourceThreshold[name] = resource.NewQuantity(int64(float64(lowThreshold[name])*float64(cap.Value())*0.01), resource.DecimalSI)
+			}
+		}
+		highResourceThreshold := map[v1.ResourceName]*resource.Quantity{
+			v1.ResourceCPU:    resource.NewMilliQuantity(int64(float64(highThreshold[v1.ResourceCPU])*float64(nodeCapacity.Cpu().MilliValue())*0.01), resource.DecimalSI),
+			v1.ResourceMemory: resource.NewQuantity(int64(float64(highThreshold[v1.ResourceMemory])*float64(nodeCapacity.Memory().Value())*0.01), resource.BinarySI),
+			v1.ResourcePods:   resource.NewQuantity(int64(float64(highThreshold[v1.ResourcePods])*float64(nodeCapacity.Pods().Value())*0.01), resource.DecimalSI),
+		}
+		for _, name := range resourceNames {
+			if !isBasicResource(name) {
+				cap := nodeCapacity[name]
+				highResourceThreshold[name] = resource.NewQuantity(int64(float64(highThreshold[name])*float64(cap.Value())*0.01), resource.DecimalSI)
+			}
+		}
+
+		nodeUsageList = append(nodeUsageList, NodeUsage{
+			node:                  node,
+			usage:                 nodeUtilization(node, pods, resourceNames),
+			allPods:               pods,
+			lowResourceThreshold:  lowResourceThreshold,
+			highResourceThreshold: highResourceThreshold,
+		})
+	}
+
+	return nodeUsageList
+}
+
+func resourceUsagePercentages(nodeUsage NodeUsage) map[v1.ResourceName]float64 {
+	nodeCapacity := nodeUsage.node.Status.Capacity
+	if len(nodeUsage.node.Status.Allocatable) > 0 {
+		nodeCapacity = nodeUsage.node.Status.Allocatable
+	}
+
+	resourceUsagePercentage := map[v1.ResourceName]float64{}
+	for resourceName, resourceUsage := range nodeUsage.usage {
+		cap := nodeCapacity[resourceName]
+		if !cap.IsZero() {
+			resourceUsagePercentage[resourceName] = 100 * float64(resourceUsage.MilliValue()) / float64(cap.MilliValue())
+		}
+	}
+
+	return resourceUsagePercentage
+}
+
+// classifyNodes classifies the nodes into low-utilization or high-utilization nodes. If a node lies between
+// low and high thresholds, it is simply ignored.
+func classifyNodes(
+	nodeUsages []NodeUsage,
+	lowThresholdFilter, highThresholdFilter func(node *v1.Node, usage NodeUsage) bool,
+) ([]NodeUsage, []NodeUsage) {
+	lowNodes, highNodes := []NodeUsage{}, []NodeUsage{}
+
+	for _, nodeUsage := range nodeUsages {
+		if lowThresholdFilter(nodeUsage.node, nodeUsage) {
+			klog.V(2).InfoS("Node is underutilized", "node", klog.KObj(nodeUsage.node), "usage", nodeUsage.usage, "usagePercentage", resourceUsagePercentages(nodeUsage))
+			lowNodes = append(lowNodes, nodeUsage)
+		} else if highThresholdFilter(nodeUsage.node, nodeUsage) {
+			klog.V(2).InfoS("Node is overutilized", "node", klog.KObj(nodeUsage.node), "usage", nodeUsage.usage, "usagePercentage", resourceUsagePercentages(nodeUsage))
+			highNodes = append(highNodes, nodeUsage)
+		} else {
+			klog.V(2).InfoS("Node is appropriately utilized", "node", klog.KObj(nodeUsage.node), "usage", nodeUsage.usage, "usagePercentage", resourceUsagePercentages(nodeUsage))
+		}
+	}
+
+	return lowNodes, highNodes
+}
+
+// evictPodsFromSourceNodes evicts pods based on priority, if all the pods on the node have priority, if not
+// evicts them based on QoS as fallback option.
+// TODO: @ravig Break this function into smaller functions.
+func evictPodsFromSourceNodes(
+	ctx context.Context,
+	sourceNodes, destinationNodes []NodeUsage,
+	podEvictor *evictions.PodEvictor,
+	podFilter func(pod *v1.Pod) bool,
+	resourceNames []v1.ResourceName,
+	strategy string,
+	continueEviction continueEvictionCond,
+) {
+
+	sortNodesByUsage(sourceNodes)
+
+	// upper bound on total number of pods/cpu/memory and optional extended resources to be moved
+	totalAvailableUsage := map[v1.ResourceName]*resource.Quantity{
+		v1.ResourcePods:   {},
+		v1.ResourceCPU:    {},
+		v1.ResourceMemory: {},
+	}
+
+	var taintsOfDestinationNodes = make(map[string][]v1.Taint, len(destinationNodes))
+	for _, node := range destinationNodes {
+		taintsOfDestinationNodes[node.node.Name] = node.node.Spec.Taints
+
+		for _, name := range resourceNames {
+			if _, ok := totalAvailableUsage[name]; !ok {
+				totalAvailableUsage[name] = resource.NewQuantity(0, resource.DecimalSI)
+			}
+			totalAvailableUsage[name].Add(*node.highResourceThreshold[name])
+			totalAvailableUsage[name].Sub(*node.usage[name])
+		}
+	}
+
+	// log message in one line
+	keysAndValues := []interface{}{
+		"CPU", totalAvailableUsage[v1.ResourceCPU].MilliValue(),
+		"Mem", totalAvailableUsage[v1.ResourceMemory].Value(),
+		"Pods", totalAvailableUsage[v1.ResourcePods].Value(),
+	}
+	for name := range totalAvailableUsage {
+		if !isBasicResource(name) {
+			keysAndValues = append(keysAndValues, string(name), totalAvailableUsage[name].Value())
+		}
+	}
+	klog.V(1).InfoS("Total capacity to be moved", keysAndValues...)
+
+	for _, node := range sourceNodes {
+		klog.V(3).InfoS("Evicting pods from node", "node", klog.KObj(node.node), "usage", node.usage)
+
+		nonRemovablePods, removablePods := classifyPods(node.allPods, podFilter)
+		klog.V(2).InfoS("Pods on node", "node", klog.KObj(node.node), "allPods", len(node.allPods), "nonRemovablePods", len(nonRemovablePods), "removablePods", len(removablePods))
+
+		if len(removablePods) == 0 {
+			klog.V(1).InfoS("No removable pods on node, try next node", "node", klog.KObj(node.node))
+			continue
+		}
+
+		klog.V(1).InfoS("Evicting pods based on priority, if they have same priority, they'll be evicted based on QoS tiers")
+		// sort the evictable Pods based on priority. This also sorts them based on QoS. If there are multiple pods with same priority, they are sorted based on QoS tiers.
+		podutil.SortPodsBasedOnPriorityLowToHigh(removablePods)
+		evictPods(ctx, removablePods, node, totalAvailableUsage, taintsOfDestinationNodes, podEvictor, strategy, continueEviction)
+		klog.V(1).InfoS("Evicted pods from node", "node", klog.KObj(node.node), "evictedPods", podEvictor.NodeEvicted(node.node), "usage", node.usage)
+	}
+}
+
+func evictPods(
+	ctx context.Context,
+	inputPods []*v1.Pod,
+	nodeUsage NodeUsage,
+	totalAvailableUsage map[v1.ResourceName]*resource.Quantity,
+	taintsOfLowNodes map[string][]v1.Taint,
+	podEvictor *evictions.PodEvictor,
+	strategy string,
+	continueEviction continueEvictionCond,
+) {
+
+	if continueEviction(nodeUsage, totalAvailableUsage) {
+		for _, pod := range inputPods {
+			if !utils.PodToleratesTaints(pod, taintsOfLowNodes) {
+				klog.V(3).InfoS("Skipping eviction for pod, doesn't tolerate node taint", "pod", klog.KObj(pod))
+				continue
+			}
+
+			success, err := podEvictor.EvictPod(ctx, pod, nodeUsage.node, strategy)
+			if err != nil {
+				klog.ErrorS(err, "Error evicting pod", "pod", klog.KObj(pod))
+				break
+			}
+
+			if success {
+				klog.V(3).InfoS("Evicted pods", "pod", klog.KObj(pod), "err", err)
+
+				for name := range totalAvailableUsage {
+					if name == v1.ResourcePods {
+						nodeUsage.usage[name].Sub(*resource.NewQuantity(1, resource.DecimalSI))
+						totalAvailableUsage[name].Sub(*resource.NewQuantity(1, resource.DecimalSI))
+					} else {
+						quantity := utils.GetResourceRequestQuantity(pod, name)
+						nodeUsage.usage[name].Sub(quantity)
+						totalAvailableUsage[name].Sub(quantity)
+					}
+				}
+
+				keysAndValues := []interface{}{
+					"node", nodeUsage.node.Name,
+					"CPU", nodeUsage.usage[v1.ResourceCPU].MilliValue(),
+					"Mem", nodeUsage.usage[v1.ResourceMemory].Value(),
+					"Pods", nodeUsage.usage[v1.ResourcePods].Value(),
+				}
+				for name := range totalAvailableUsage {
+					if !isBasicResource(name) {
+						keysAndValues = append(keysAndValues, string(name), totalAvailableUsage[name].Value())
+					}
+				}
+
+				klog.V(3).InfoS("Updated node usage", keysAndValues...)
+				// check if pods can be still evicted
+				if !continueEviction(nodeUsage, totalAvailableUsage) {
+					break
+				}
+			}
+		}
+	}
+}
+
+// sortNodesByUsage sorts nodes based on usage in descending order
+func sortNodesByUsage(nodes []NodeUsage) {
+	sort.Slice(nodes, func(i, j int) bool {
+		ti := nodes[i].usage[v1.ResourceMemory].Value() + nodes[i].usage[v1.ResourceCPU].MilliValue() + nodes[i].usage[v1.ResourcePods].Value()
+		tj := nodes[j].usage[v1.ResourceMemory].Value() + nodes[j].usage[v1.ResourceCPU].MilliValue() + nodes[j].usage[v1.ResourcePods].Value()
+
+		// extended resources
+		for name := range nodes[i].usage {
+			if !isBasicResource(name) {
+				ti = ti + nodes[i].usage[name].Value()
+				tj = tj + nodes[j].usage[name].Value()
+			}
+		}
+
+		// To return sorted in descending order
+		return ti > tj
+	})
+}
+
+// isNodeAboveTargetUtilization checks if a node is overutilized
+// At least one resource has to be above the high threshold
+func isNodeAboveTargetUtilization(usage NodeUsage) bool {
+	for name, nodeValue := range usage.usage {
+		// usage.highResourceThreshold[name] < nodeValue
+		if usage.highResourceThreshold[name].Cmp(*nodeValue) == -1 {
+			return true
+		}
+	}
+	return false
+}
+
+// isNodeWithLowUtilization checks if a node is underutilized
+// All resources have to be below the low threshold
+func isNodeWithLowUtilization(usage NodeUsage) bool {
+	for name, nodeValue := range usage.usage {
+		// usage.lowResourceThreshold[name] < nodeValue
+		if usage.lowResourceThreshold[name].Cmp(*nodeValue) == -1 {
+			return false
+		}
+	}
+
+	return true
+}
+
+// getResourceNames returns list of resource names in resource thresholds
+func getResourceNames(thresholds api.ResourceThresholds) []v1.ResourceName {
+	resourceNames := make([]v1.ResourceName, 0, len(thresholds))
+	for name := range thresholds {
+		resourceNames = append(resourceNames, name)
+	}
+	return resourceNames
+}
+
+// isBasicResource checks if resource is basic native.
+func isBasicResource(name v1.ResourceName) bool {
+	switch name {
+	case v1.ResourceCPU, v1.ResourceMemory, v1.ResourcePods:
+		return true
+	default:
+		return false
+	}
+}
+
+func nodeUtilization(node *v1.Node, pods []*v1.Pod, resourceNames []v1.ResourceName) map[v1.ResourceName]*resource.Quantity {
+	totalReqs := map[v1.ResourceName]*resource.Quantity{
+		v1.ResourceCPU:    resource.NewMilliQuantity(0, resource.DecimalSI),
+		v1.ResourceMemory: resource.NewQuantity(0, resource.BinarySI),
+		v1.ResourcePods:   resource.NewQuantity(int64(len(pods)), resource.DecimalSI),
+	}
+	for _, name := range resourceNames {
+		if !isBasicResource(name) {
+			totalReqs[name] = resource.NewQuantity(0, resource.DecimalSI)
+		}
+	}
+
+	for _, pod := range pods {
+		req, _ := utils.PodRequestsAndLimits(pod)
+		for _, name := range resourceNames {
+			quantity, ok := req[name]
+			if ok && name != v1.ResourcePods {
+				// As Quantity.Add says: Add adds the provided y quantity to the current value. If the current value is zero,
+				// the format of the quantity will be updated to the format of y.
+				totalReqs[name].Add(quantity)
+			}
+		}
+	}
+
+	return totalReqs
+}
+
+func classifyPods(pods []*v1.Pod, filter func(pod *v1.Pod) bool) ([]*v1.Pod, []*v1.Pod) {
+	var nonRemovablePods, removablePods []*v1.Pod
+
+	for _, pod := range pods {
+		if !filter(pod) {
+			nonRemovablePods = append(nonRemovablePods, pod)
+		} else {
+			removablePods = append(removablePods, pod)
+		}
+	}
+
+	return nonRemovablePods, removablePods
+}

pkg/descheduler/strategies/nodeutilization/nodeutilization_test.go

@@ -0,0 +1,158 @@
+/*
+Copyright 2021 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package nodeutilization
+
+import (
+	"fmt"
+	v1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/api/resource"
+	"math"
+	"sigs.k8s.io/descheduler/pkg/api"
+	"testing"
+)
+
+var (
+	lowPriority      = int32(0)
+	highPriority     = int32(10000)
+	extendedResource = v1.ResourceName("example.com/foo")
+)
+
+func TestValidateThresholds(t *testing.T) {
+	tests := []struct {
+		name    string
+		input   api.ResourceThresholds
+		errInfo error
+	}{
+		{
+			name:    "passing nil map for threshold",
+			input:   nil,
+			errInfo: fmt.Errorf("no resource threshold is configured"),
+		},
+		{
+			name:    "passing no threshold",
+			input:   api.ResourceThresholds{},
+			errInfo: fmt.Errorf("no resource threshold is configured"),
+		},
+		{
+			name: "passing extended resource name other than cpu/memory/pods",
+			input: api.ResourceThresholds{
+				v1.ResourceCPU:   40,
+				extendedResource: 50,
+			},
+			errInfo: nil,
+		},
+		{
+			name: "passing invalid resource value",
+			input: api.ResourceThresholds{
+				v1.ResourceCPU:    110,
+				v1.ResourceMemory: 80,
+			},
+			errInfo: fmt.Errorf("%v threshold not in [%v, %v] range", v1.ResourceCPU, MinResourcePercentage, MaxResourcePercentage),
+		},
+		{
+			name: "passing a valid threshold with max and min resource value",
+			input: api.ResourceThresholds{
+				v1.ResourceCPU:    100,
+				v1.ResourceMemory: 0,
+			},
+			errInfo: nil,
+		},
+		{
+			name: "passing a valid threshold with only cpu",
+			input: api.ResourceThresholds{
+				v1.ResourceCPU: 80,
+			},
+			errInfo: nil,
+		},
+		{
+			name: "passing a valid threshold with cpu, memory and pods",
+			input: api.ResourceThresholds{
+				v1.ResourceCPU:    20,
+				v1.ResourceMemory: 30,
+				v1.ResourcePods:   40,
+			},
+			errInfo: nil,
+		},
+		{
+			name: "passing a valid threshold with only extended resource",
+			input: api.ResourceThresholds{
+				extendedResource: 80,
+			},
+			errInfo: nil,
+		},
+		{
+			name: "passing a valid threshold with cpu, memory, pods and extended resource",
+			input: api.ResourceThresholds{
+				v1.ResourceCPU:    20,
+				v1.ResourceMemory: 30,
+				v1.ResourcePods:   40,
+				extendedResource:  50,
+			},
+			errInfo: nil,
+		},
+	}
+
+	for _, test := range tests {
+		validateErr := validateThresholds(test.input)
+
+		if validateErr == nil || test.errInfo == nil {
+			if validateErr != test.errInfo {
+				t.Errorf("expected validity of threshold: %#v to be %v but got %v instead", test.input, test.errInfo, validateErr)
+			}
+		} else if validateErr.Error() != test.errInfo.Error() {
+			t.Errorf("expected validity of threshold: %#v to be %v but got %v instead", test.input, test.errInfo, validateErr)
+		}
+	}
+}
+
+func TestResourceUsagePercentages(t *testing.T) {
+	resourceUsagePercentage := resourceUsagePercentages(NodeUsage{
+		node: &v1.Node{
+			Status: v1.NodeStatus{
+				Capacity: v1.ResourceList{
+					v1.ResourceCPU:    *resource.NewMilliQuantity(2000, resource.DecimalSI),
+					v1.ResourceMemory: *resource.NewQuantity(3977868*1024, resource.BinarySI),
+					v1.ResourcePods:   *resource.NewQuantity(29, resource.BinarySI),
+				},
+				Allocatable: v1.ResourceList{
+					v1.ResourceCPU:    *resource.NewMilliQuantity(1930, resource.DecimalSI),
+					v1.ResourceMemory: *resource.NewQuantity(3287692*1024, resource.BinarySI),
+					v1.ResourcePods:   *resource.NewQuantity(29, resource.BinarySI),
+				},
+			},
+		},
+		usage: map[v1.ResourceName]*resource.Quantity{
+			v1.ResourceCPU:    resource.NewMilliQuantity(1220, resource.DecimalSI),
+			v1.ResourceMemory: resource.NewQuantity(3038982964, resource.BinarySI),
+			v1.ResourcePods:   resource.NewQuantity(11, resource.BinarySI),
+		},
+	})
+
+	expectedUsageInIntPercentage := map[v1.ResourceName]float64{
+		v1.ResourceCPU:    63,
+		v1.ResourceMemory: 90,
+		v1.ResourcePods:   37,
+	}
+
+	for resourceName, percentage := range expectedUsageInIntPercentage {
+		if math.Floor(resourceUsagePercentage[resourceName]) != percentage {
+			t.Errorf("Incorrect percentange computation, expected %v, got math.Floor(%v) instead", percentage, resourceUsagePercentage[resourceName])
+		}
+	}
+
+	t.Logf("resourceUsagePercentage: %#v\n", resourceUsagePercentage)
+}

pkg/descheduler/strategies/pod_antiaffinity.go

@@ -18,36 +18,90 @@ package strategies
 
 import (
 	"context"
+	"fmt"
+
 	"sigs.k8s.io/descheduler/pkg/api"
 	"sigs.k8s.io/descheduler/pkg/descheduler/evictions"
 	podutil "sigs.k8s.io/descheduler/pkg/descheduler/pod"
 	"sigs.k8s.io/descheduler/pkg/utils"
 
-	"k8s.io/api/core/v1"
+	v1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	clientset "k8s.io/client-go/kubernetes"
-	"k8s.io/klog"
+	"k8s.io/klog/v2"
 )
 
+func validateRemovePodsViolatingInterPodAntiAffinityParams(params *api.StrategyParameters) error {
+	if params == nil {
+		return nil
+	}
+
+	// At most one of include/exclude can be set
+	if params.Namespaces != nil && len(params.Namespaces.Include) > 0 && len(params.Namespaces.Exclude) > 0 {
+		return fmt.Errorf("only one of Include/Exclude namespaces can be set")
+	}
+	if params.ThresholdPriority != nil && params.ThresholdPriorityClassName != "" {
+		return fmt.Errorf("only one of thresholdPriority and thresholdPriorityClassName can be set")
+	}
+
+	return nil
+}
+
 // RemovePodsViolatingInterPodAntiAffinity evicts pods on the node which are having a pod affinity rules.
-func RemovePodsViolatingInterPodAntiAffinity(ctx context.Context, client clientset.Interface, strategy api.DeschedulerStrategy, nodes []*v1.Node, evictLocalStoragePods bool, podEvictor *evictions.PodEvictor) {
+func RemovePodsViolatingInterPodAntiAffinity(ctx context.Context, client clientset.Interface, strategy api.DeschedulerStrategy, nodes []*v1.Node, podEvictor *evictions.PodEvictor) {
+	if err := validateRemovePodsViolatingInterPodAntiAffinityParams(strategy.Params); err != nil {
+		klog.ErrorS(err, "Invalid RemovePodsViolatingInterPodAntiAffinity parameters")
+		return
+	}
+
+	var includedNamespaces, excludedNamespaces []string
+	var labelSelector *metav1.LabelSelector
+	if strategy.Params != nil {
+		if strategy.Params.Namespaces != nil {
+			includedNamespaces = strategy.Params.Namespaces.Include
+			excludedNamespaces = strategy.Params.Namespaces.Exclude
+		}
+		labelSelector = strategy.Params.LabelSelector
+	}
+
+	thresholdPriority, err := utils.GetPriorityFromStrategyParams(ctx, client, strategy.Params)
+	if err != nil {
+		klog.ErrorS(err, "Failed to get threshold priority from strategy's params")
+		return
+	}
+
+	nodeFit := false
+	if strategy.Params != nil {
+		nodeFit = strategy.Params.NodeFit
+	}
+
+	evictable := podEvictor.Evictable(evictions.WithPriorityThreshold(thresholdPriority), evictions.WithNodeFit(nodeFit))
+
 	for _, node := range nodes {
-		klog.V(1).Infof("Processing node: %#v\n", node.Name)
-		pods, err := podutil.ListEvictablePodsOnNode(ctx, client, node, evictLocalStoragePods)
+		klog.V(1).InfoS("Processing node", "node", klog.KObj(node))
+		pods, err := podutil.ListPodsOnANode(
+			ctx,
+			client,
+			node,
+			podutil.WithNamespaces(includedNamespaces),
+			podutil.WithoutNamespaces(excludedNamespaces),
+			podutil.WithLabelSelector(labelSelector),
+		)
 		if err != nil {
 			return
 		}
+		// sort the evictable Pods based on priority, if there are multiple pods with same priority, they are sorted based on QoS tiers.
+		podutil.SortPodsBasedOnPriorityLowToHigh(pods)
 		totalPods := len(pods)
 		for i := 0; i < totalPods; i++ {
-			if checkPodsWithAntiAffinityExist(pods[i], pods) {
-				success, err := podEvictor.EvictPod(ctx, pods[i], node)
+			if checkPodsWithAntiAffinityExist(pods[i], pods) && evictable.IsEvictable(pods[i]) {
+				success, err := podEvictor.EvictPod(ctx, pods[i], node, "InterPodAntiAffinity")
 				if err != nil {
-					klog.Errorf("Error evicting pod: (%#v)", err)
+					klog.ErrorS(err, "Error evicting pod")
 					break
 				}
 
 				if success {
-					klog.V(1).Infof("Evicted pod: %#v\n because of existing anti-affinity", pods[i].Name)
 					// Since the current pod is evicted all other pods which have anti-affinity with this
 					// pod need not be evicted.
 					// Update pods.
@@ -68,7 +122,7 @@ func checkPodsWithAntiAffinityExist(pod *v1.Pod, pods []*v1.Pod) bool {
 			namespaces := utils.GetNamespacesFromPodAffinityTerm(pod, &term)
 			selector, err := metav1.LabelSelectorAsSelector(term.LabelSelector)
 			if err != nil {
-				klog.Infof("%v", err)
+				klog.ErrorS(err, "Unable to convert LabelSelector into Selector")
 				return false
 			}
 			for _, existingPod := range pods {

pkg/descheduler/strategies/pod_antiaffinity_test.go

@@ -20,73 +20,165 @@ import (
 	"context"
 	"testing"
 
-	"k8s.io/api/core/v1"
+	v1 "k8s.io/api/core/v1"
+	policyv1 "k8s.io/api/policy/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/client-go/kubernetes/fake"
 	core "k8s.io/client-go/testing"
 	"sigs.k8s.io/descheduler/pkg/api"
 	"sigs.k8s.io/descheduler/pkg/descheduler/evictions"
+	"sigs.k8s.io/descheduler/pkg/utils"
 	"sigs.k8s.io/descheduler/test"
 )
 
 func TestPodAntiAffinity(t *testing.T) {
 	ctx := context.Background()
-	node := test.BuildTestNode("n1", 2000, 3000, 10, nil)
-	p1 := test.BuildTestPod("p1", 100, 0, node.Name, nil)
-	p2 := test.BuildTestPod("p2", 100, 0, node.Name, nil)
-	p3 := test.BuildTestPod("p3", 100, 0, node.Name, nil)
-	p4 := test.BuildTestPod("p4", 100, 0, node.Name, nil)
+	node1 := test.BuildTestNode("n1", 2000, 3000, 10, nil)
+	node2 := test.BuildTestNode("n2", 2000, 3000, 10, func(node *v1.Node) {
+		node.ObjectMeta.Labels = map[string]string{
+			"datacenter": "east",
+		}
+	})
+
+	node3 := test.BuildTestNode("n3", 2000, 3000, 10, func(node *v1.Node) {
+		node.Spec = v1.NodeSpec{
+			Unschedulable: true,
+		}
+	})
+
+	p1 := test.BuildTestPod("p1", 100, 0, node1.Name, nil)
+	p2 := test.BuildTestPod("p2", 100, 0, node1.Name, nil)
+	p3 := test.BuildTestPod("p3", 100, 0, node1.Name, nil)
+	p4 := test.BuildTestPod("p4", 100, 0, node1.Name, nil)
+	p5 := test.BuildTestPod("p5", 100, 0, node1.Name, nil)
+	p6 := test.BuildTestPod("p6", 100, 0, node1.Name, nil)
+	p7 := test.BuildTestPod("p7", 100, 0, node1.Name, nil)
+	p8 := test.BuildTestPod("p8", 100, 0, node1.Name, nil)
+
+	criticalPriority := utils.SystemCriticalPriority
+	nonEvictablePod := test.BuildTestPod("non-evict", 100, 0, node1.Name, func(pod *v1.Pod) {
+		pod.Spec.Priority = &criticalPriority
+	})
 	p2.Labels = map[string]string{"foo": "bar"}
-	p1.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
-	p2.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
-	p3.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
-	p4.ObjectMeta.OwnerReferences = test.GetNormalPodOwnerRefList()
+	p5.Labels = map[string]string{"foo": "bar"}
+	p6.Labels = map[string]string{"foo": "bar"}
+	p7.Labels = map[string]string{"foo1": "bar1"}
+	nonEvictablePod.Labels = map[string]string{"foo": "bar"}
+	test.SetNormalOwnerRef(p1)
+	test.SetNormalOwnerRef(p2)
+	test.SetNormalOwnerRef(p3)
+	test.SetNormalOwnerRef(p4)
+	test.SetNormalOwnerRef(p5)
+	test.SetNormalOwnerRef(p6)
+	test.SetNormalOwnerRef(p7)
 
 	// set pod anti affinity
-	setPodAntiAffinity(p1)
-	setPodAntiAffinity(p3)
-	setPodAntiAffinity(p4)
+	setPodAntiAffinity(p1, "foo", "bar")
+	setPodAntiAffinity(p3, "foo", "bar")
+	setPodAntiAffinity(p4, "foo", "bar")
+	setPodAntiAffinity(p5, "foo1", "bar1")
+	setPodAntiAffinity(p6, "foo1", "bar1")
+	setPodAntiAffinity(p7, "foo", "bar")
+
+	// set pod priority
+	test.SetPodPriority(p5, 100)
+	test.SetPodPriority(p6, 50)
+	test.SetPodPriority(p7, 0)
+
+	// Set pod node selectors
+	p8.Spec.NodeSelector = map[string]string{
+		"datacenter": "west",
+	}
 
 	tests := []struct {
 		description             string
-		maxPodsToEvict          int
+		maxPodsToEvictPerNode   int
 		pods                    []v1.Pod
 		expectedEvictedPodCount int
+		nodeFit                 bool
+		nodes                   []*v1.Node
 	}{
 		{
 			description:             "Maximum pods to evict - 0",
-			maxPodsToEvict:          0,
+			maxPodsToEvictPerNode:   0,
 			pods:                    []v1.Pod{*p1, *p2, *p3, *p4},
+			nodes:                   []*v1.Node{node1},
 			expectedEvictedPodCount: 3,
 		},
 		{
 			description:             "Maximum pods to evict - 3",
-			maxPodsToEvict:          3,
+			maxPodsToEvictPerNode:   3,
 			pods:                    []v1.Pod{*p1, *p2, *p3, *p4},
+			nodes:                   []*v1.Node{node1},
 			expectedEvictedPodCount: 3,
 		},
+		{
+			description:             "Evict only 1 pod after sorting",
+			maxPodsToEvictPerNode:   0,
+			pods:                    []v1.Pod{*p5, *p6, *p7},
+			nodes:                   []*v1.Node{node1},
+			expectedEvictedPodCount: 1,
+		},
+		{
+			description:             "Evicts pod that conflicts with critical pod (but does not evict critical pod)",
+			maxPodsToEvictPerNode:   1,
+			pods:                    []v1.Pod{*p1, *nonEvictablePod},
+			nodes:                   []*v1.Node{node1},
+			expectedEvictedPodCount: 1,
+		},
+		{
+			description:             "Evicts pod that conflicts with critical pod (but does not evict critical pod)",
+			maxPodsToEvictPerNode:   1,
+			pods:                    []v1.Pod{*p1, *nonEvictablePod},
+			nodes:                   []*v1.Node{node1},
+			expectedEvictedPodCount: 1,
+		},
+		{
+			description:             "Won't evict pods because node selectors don't match available nodes",
+			maxPodsToEvictPerNode:   1,
+			pods:                    []v1.Pod{*p8, *nonEvictablePod},
+			nodes:                   []*v1.Node{node1, node2},
+			expectedEvictedPodCount: 0,
+			nodeFit:                 true,
+		},
+		{
+			description:             "Won't evict pods because only other node is not schedulable",
+			maxPodsToEvictPerNode:   1,
+			pods:                    []v1.Pod{*p8, *nonEvictablePod},
+			nodes:                   []*v1.Node{node1, node3},
+			expectedEvictedPodCount: 0,
+			nodeFit:                 true,
+		},
 	}
 
 	for _, test := range tests {
 		// create fake client
 		fakeClient := &fake.Clientset{}
 		fakeClient.Fake.AddReactor("list", "pods", func(action core.Action) (bool, runtime.Object, error) {
-			return true, &v1.PodList{Items: []v1.Pod{*p1, *p2, *p3, *p4}}, nil
+			return true, &v1.PodList{Items: test.pods}, nil
 		})
 		fakeClient.Fake.AddReactor("get", "nodes", func(action core.Action) (bool, runtime.Object, error) {
-			return true, node, nil
+			return true, node1, nil
 		})
 
 		podEvictor := evictions.NewPodEvictor(
 			fakeClient,
-			"v1",
+			policyv1.SchemeGroupVersion.String(),
+			false,
+			test.maxPodsToEvictPerNode,
+			test.nodes,
+			false,
+			false,
 			false,
-			test.maxPodsToEvict,
-			[]*v1.Node{node},
 		)
+		strategy := api.DeschedulerStrategy{
+			Params: &api.StrategyParameters{
+				NodeFit: test.nodeFit,
+			},
+		}
 
-		RemovePodsViolatingInterPodAntiAffinity(ctx, fakeClient, api.DeschedulerStrategy{}, []*v1.Node{node}, false, podEvictor)
+		RemovePodsViolatingInterPodAntiAffinity(ctx, fakeClient, strategy, test.nodes, podEvictor)
 		podsEvicted := podEvictor.TotalEvicted()
 		if podsEvicted != test.expectedEvictedPodCount {
 			t.Errorf("Unexpected no of pods evicted: pods evicted: %d, expected: %d", podsEvicted, test.expectedEvictedPodCount)
@@ -94,7 +186,7 @@ func TestPodAntiAffinity(t *testing.T) {
 	}
 }
 
-func setPodAntiAffinity(inputPod *v1.Pod) {
+func setPodAntiAffinity(inputPod *v1.Pod, labelKey, labelValue string) {
 	inputPod.Spec.Affinity = &v1.Affinity{
 		PodAntiAffinity: &v1.PodAntiAffinity{
 			RequiredDuringSchedulingIgnoredDuringExecution: []v1.PodAffinityTerm{
@@ -102,9 +194,9 @@ func setPodAntiAffinity(inputPod *v1.Pod) {
 					LabelSelector: &metav1.LabelSelector{
 						MatchExpressions: []metav1.LabelSelectorRequirement{
 							{
-								Key:      "foo",
+								Key:      labelKey,
 								Operator: metav1.LabelSelectorOpIn,
-								Values:   []string{"bar"},
+								Values:   []string{labelValue},
 							},
 						},
 					},