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Add serial tests
Signed-off-by: Itamar Holder <iholder@redhat.com>
This commit is contained in:
Itamar Holder
parent
2230ed7dc6
commit
bdeb80a846
@ -19,10 +19,17 @@ package e2enode
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import (
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"context"
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"fmt"
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"k8s.io/kubernetes/pkg/apis/core/v1/helper/qos"
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"k8s.io/kubernetes/pkg/kubelet/apis/config"
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"k8s.io/kubernetes/pkg/kubelet/cm"
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e2eskipper "k8s.io/kubernetes/test/e2e/framework/skipper"
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"k8s.io/kubernetes/test/e2e/nodefeature"
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"math/big"
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"os/exec"
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"path/filepath"
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"strconv"
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"strings"
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"time"
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"github.com/onsi/ginkgo/v2"
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"github.com/onsi/gomega"
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@ -41,6 +48,13 @@ import (
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const (
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cgroupBasePath = "/sys/fs/cgroup/"
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cgroupV2SwapLimitFile = "memory.swap.max"
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cgroupV2swapCurrentUsageFile = "memory.swap.current"
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cgroupV2MemoryCurrentUsageFile = "memory.current"
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)
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var (
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noRequests *resource.Quantity = nil
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noLimits *resource.Quantity = nil
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)
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var _ = SIGDescribe("Swap", "[LinuxOnly]", nodefeature.Swap, func() {
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@ -59,19 +73,19 @@ var _ = SIGDescribe("Swap", "[LinuxOnly]", nodefeature.Swap, func() {
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if !isSwapFeatureGateEnabled() || !isCgroupV2 || isNoSwap || (isLimitedSwap && (qosClass != v1.PodQOSBurstable || memoryRequestEqualLimit)) {
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ginkgo.By(fmt.Sprintf("Expecting no swap. isNoSwap? %t, feature gate on? %t isCgroupV2? %t is QoS burstable? %t", isNoSwap, isSwapFeatureGateEnabled(), isCgroupV2, qosClass == v1.PodQOSBurstable))
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expectNoSwap(f, pod)
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expectNoSwap(pod)
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return
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}
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if !isLimitedSwap {
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ginkgo.By("expecting no swap")
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expectNoSwap(f, pod)
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expectNoSwap(pod)
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return
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}
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ginkgo.By("expecting limited swap")
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expectedSwapLimit := calcSwapForBurstablePod(f, pod)
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expectLimitedSwap(f, pod, expectedSwapLimit)
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expectLimitedSwap(pod, expectedSwapLimit)
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},
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ginkgo.Entry("QOS Best-effort", v1.PodQOSBestEffort, false),
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ginkgo.Entry("QOS Burstable", v1.PodQOSBurstable, false),
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@ -79,6 +93,168 @@ var _ = SIGDescribe("Swap", "[LinuxOnly]", nodefeature.Swap, func() {
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ginkgo.Entry("QOS Guaranteed", v1.PodQOSGuaranteed, false),
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)
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})
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f.Context(framework.WithSerial(), func() {
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// These tests assume the following, and will fail otherwise:
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// - The node is provisioned with swap
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// - The node is configured with cgroup v2
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// - The swap feature gate is enabled
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// - The node has no more than 15GB of memory
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f.Context("with swap stress", func() {
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var (
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nodeName string
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nodeTotalMemory *resource.Quantity
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nodeUsedMemory *resource.Quantity
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swapCapacity *resource.Quantity
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stressMemAllocSize *resource.Quantity
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podClient *e2epod.PodClient
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)
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ginkgo.BeforeEach(func() {
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podClient = e2epod.NewPodClient(f)
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sleepingPod := getSleepingPod(f.Namespace.Name)
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sleepingPod = runPodAndWaitUntilScheduled(f, sleepingPod)
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gomega.Expect(isPodCgroupV2(f, sleepingPod)).To(gomega.BeTrue(), "node uses cgroup v1")
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nodeName = sleepingPod.Spec.NodeName
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gomega.Expect(nodeName).ToNot(gomega.BeEmpty(), "node name is empty")
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nodeTotalMemory, nodeUsedMemory = getMemoryCapacity(f, nodeName)
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gomega.Expect(nodeTotalMemory.IsZero()).To(gomega.BeFalse(), "node memory capacity is zero")
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gomega.Expect(nodeUsedMemory.IsZero()).To(gomega.BeFalse(), "node used memory is zero")
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swapCapacity = getSwapCapacity(f, sleepingPod)
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gomega.Expect(swapCapacity.IsZero()).To(gomega.BeFalse(), "node swap capacity is zero")
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err := podClient.Delete(context.Background(), sleepingPod.Name, metav1.DeleteOptions{})
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framework.ExpectNoError(err)
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stressMemAllocSize = multiplyQuantity(divideQuantity(nodeTotalMemory, 1000), 4)
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ginkgo.By(fmt.Sprintf("Setting node values. nodeName: %s, nodeTotalMemory: %s, nodeUsedMemory: %s, swapCapacity: %s, stressMemAllocSize: %s",
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nodeName, nodeTotalMemory.String(), nodeUsedMemory.String(), swapCapacity.String(), stressMemAllocSize.String()))
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})
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ginkgo.Context("LimitedSwap", func() {
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tempSetCurrentKubeletConfig(f, func(ctx context.Context, initialConfig *config.KubeletConfiguration) {
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msg := "swap behavior is already set to LimitedSwap"
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if swapBehavior := initialConfig.MemorySwap.SwapBehavior; swapBehavior != types.LimitedSwap {
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initialConfig.MemorySwap.SwapBehavior = types.LimitedSwap
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msg = "setting swap behavior to LimitedSwap"
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}
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ginkgo.By(msg)
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})
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getRequestBySwapLimit := func(swapPercentage int64) *resource.Quantity {
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gomega.ExpectWithOffset(1, swapPercentage).To(gomega.And(
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gomega.BeNumerically(">=", 1),
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gomega.BeNumerically("<=", 100),
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), "percentage has to be between 1 and 100")
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// <swap-limit> = <memory-request>*(<swap-capacity>/<node-capacity>).
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// if x is the percentage, and <memory-request> == (x/100)*<node-capacity>, then:
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// <swap-limit> = (x/100)*<node-capacity>*(<swap-capacity>/<node-capacity>) = (x/100)*<swap-capacity>.
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return multiplyQuantity(divideQuantity(nodeTotalMemory, 100), swapPercentage)
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}
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getStressPod := func(stressSize *resource.Quantity) *v1.Pod {
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pod := getStressPod(f, stressSize, stressMemAllocSize)
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pod.Spec.NodeName = nodeName
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return pod
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}
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ginkgo.It("should be able over-commit the node memory", func() {
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stressSize := cloneQuantity(nodeTotalMemory)
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stressPod := getStressPod(stressSize)
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// Request will use a lot more swap memory than needed, since we don't test swap limits in this test
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memRequest := getRequestBySwapLimit(30)
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setPodMmoryResources(stressPod, memRequest, noLimits)
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gomega.Expect(qos.GetPodQOS(stressPod)).To(gomega.Equal(v1.PodQOSBurstable))
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ginkgo.By(fmt.Sprintf("creating a stress pod with stress size %s and request of %s", stressSize.String(), memRequest.String()))
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stressPod = runPodAndWaitUntilScheduled(f, stressPod)
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ginkgo.By("Expecting the swap usage to be non-zero")
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var swapUsage *resource.Quantity
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gomega.Eventually(func() error {
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stressPod = getUpdatedPod(f, stressPod)
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gomega.Expect(stressPod.Status.Phase).To(gomega.Equal(v1.PodRunning), "pod should be running")
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var err error
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swapUsage, err = getSwapUsage(stressPod)
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if err != nil {
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return err
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}
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if swapUsage.IsZero() {
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return fmt.Errorf("swap usage is zero")
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}
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return nil
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}, 5*time.Minute, 1*time.Second).Should(gomega.Succeed(), "swap usage is above zero: %s", swapUsage.String())
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// Better to delete the stress pod ASAP to avoid node failures
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err := podClient.Delete(context.Background(), stressPod.Name, metav1.DeleteOptions{})
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framework.ExpectNoError(err)
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})
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ginkgo.It("should be able to use more memory than memory limits", func() {
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stressSize := divideQuantity(nodeTotalMemory, 5)
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ginkgo.By("Creating a stress pod with stress size: " + stressSize.String())
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stressPod := getStressPod(stressSize)
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memoryLimit := cloneQuantity(stressSize)
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memoryLimit.Sub(resource.MustParse("50Mi"))
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memoryRequest := divideQuantity(memoryLimit, 2)
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ginkgo.By("Adding memory request of " + memoryRequest.String() + " and memory limit of " + memoryLimit.String())
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setPodMmoryResources(stressPod, memoryRequest, memoryLimit)
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gomega.Expect(qos.GetPodQOS(stressPod)).To(gomega.Equal(v1.PodQOSBurstable))
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var swapUsage, memoryUsage *resource.Quantity
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// This is sanity check to ensure that swap usage is not caused by a system-level pressure, but
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// due to a container-level (cgroup-level) pressure that's caused because of the memory limits.
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minExpectedMemoryUsage := multiplyQuantity(divideQuantity(memoryLimit, 4), 3)
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stressPod = runPodAndWaitUntilScheduled(f, stressPod)
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ginkgo.By("Expecting the pod exceed limits and avoid an OOM kill since it would use swap")
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gomega.Eventually(func() error {
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stressPod = getUpdatedPod(f, stressPod)
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gomega.Expect(stressPod.Status.Phase).To(gomega.Equal(v1.PodRunning), "pod should be running")
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var err error
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swapUsage, err = getSwapUsage(stressPod)
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if err != nil {
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return err
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}
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memoryUsage, err = getMemoryUsage(stressPod)
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if err != nil {
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return err
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}
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if memoryUsage.Cmp(*minExpectedMemoryUsage) == -1 {
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return fmt.Errorf("memory usage (%s) is smaller than minimum expected memory usage (%s)", memoryUsage.String(), minExpectedMemoryUsage.String())
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}
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if swapUsage.IsZero() {
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return fmt.Errorf("swap usage is zero")
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}
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return nil
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}, 5*time.Minute, 1*time.Second).Should(gomega.Succeed())
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// Better to delete the stress pod ASAP to avoid node failures
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err := podClient.Delete(context.Background(), stressPod.Name, metav1.DeleteOptions{})
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framework.ExpectNoError(err)
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})
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})
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})
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})
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})
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// Note that memoryRequestEqualLimit is effective only when qosClass is not PodQOSBestEffort.
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@ -133,14 +309,41 @@ func getSleepingPod(namespace string) *v1.Pod {
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}
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}
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func getStressPod(f *framework.Framework, stressSize, memAllocSize *resource.Quantity) *v1.Pod {
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return &v1.Pod{
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ObjectMeta: metav1.ObjectMeta{
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Name: "stress-pod-" + rand.String(5),
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Namespace: f.Namespace.Name,
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},
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Spec: v1.PodSpec{
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RestartPolicy: v1.RestartPolicyNever,
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Containers: []v1.Container{
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{
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Name: "stress-container",
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Image: "registry.k8s.io/stress:v1",
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ImagePullPolicy: v1.PullAlways,
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Args: []string{"-mem-alloc-size", memAllocSize.String(), "-mem-alloc-sleep", "500ms", "-mem-total", strconv.Itoa(int(stressSize.Value()))},
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},
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},
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},
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}
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}
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func getUpdatedPod(f *framework.Framework, pod *v1.Pod) *v1.Pod {
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podClient := e2epod.NewPodClient(f)
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pod, err := podClient.Get(context.Background(), pod.Name, metav1.GetOptions{})
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framework.ExpectNoError(err)
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return pod
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}
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func runPodAndWaitUntilScheduled(f *framework.Framework, pod *v1.Pod) *v1.Pod {
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ginkgo.By("running swap test pod")
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podClient := e2epod.NewPodClient(f)
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pod = podClient.CreateSync(context.Background(), pod)
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pod, err := podClient.Get(context.Background(), pod.Name, metav1.GetOptions{})
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pod = getUpdatedPod(f, pod)
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framework.ExpectNoError(err)
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isReady, err := testutils.PodRunningReady(pod)
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framework.ExpectNoError(err)
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gomega.ExpectWithOffset(1, isReady).To(gomega.BeTrue(), "pod should be ready")
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@ -153,15 +356,6 @@ func isSwapFeatureGateEnabled() bool {
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return e2eskipper.IsFeatureGateEnabled(features.NodeSwap)
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}
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func readCgroupFile(f *framework.Framework, pod *v1.Pod, filename string) string {
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filePath := filepath.Join(cgroupBasePath, filename)
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ginkgo.By("reading cgroup file " + filePath)
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output := e2epod.ExecCommandInContainer(f, pod.Name, pod.Spec.Containers[0].Name, "/bin/sh", "-ec", "cat "+filePath)
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return output
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}
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func isPodCgroupV2(f *framework.Framework, pod *v1.Pod) bool {
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ginkgo.By("figuring is test pod runs cgroup v2")
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output := e2epod.ExecCommandInContainer(f, pod.Name, pod.Spec.Containers[0].Name, "/bin/sh", "-ec", `if test -f "/sys/fs/cgroup/cgroup.controllers"; then echo "true"; else echo "false"; fi`)
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@ -169,14 +363,20 @@ func isPodCgroupV2(f *framework.Framework, pod *v1.Pod) bool {
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return output == "true"
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}
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func expectNoSwap(f *framework.Framework, pod *v1.Pod) {
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swapLimit := readCgroupFile(f, pod, cgroupV2SwapLimitFile)
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gomega.ExpectWithOffset(1, swapLimit).To(gomega.Equal("0"), "max swap allowed should be zero")
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func expectNoSwap(pod *v1.Pod) {
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ginkgo.By("expecting no swap")
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const offest = 1
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swapLimit, err := readCgroupFile(pod, cgroupV2SwapLimitFile)
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gomega.ExpectWithOffset(offest, err).ToNot(gomega.HaveOccurred())
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gomega.ExpectWithOffset(offest, swapLimit).To(gomega.Equal("0"), "max swap allowed should be zero")
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}
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// supports v2 only as v1 shouldn't support LimitedSwap
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func expectLimitedSwap(f *framework.Framework, pod *v1.Pod, expectedSwapLimit int64) {
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swapLimitStr := readCgroupFile(f, pod, cgroupV2SwapLimitFile)
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func expectLimitedSwap(pod *v1.Pod, expectedSwapLimit int64) {
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ginkgo.By("expecting limited swap")
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swapLimitStr, err := readCgroupFile(pod, cgroupV2SwapLimitFile)
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framework.ExpectNoError(err)
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swapLimit, err := strconv.Atoi(swapLimitStr)
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framework.ExpectNoError(err, "cannot convert swap limit to int")
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@ -210,8 +410,8 @@ func getMemoryCapacity(f *framework.Framework, nodeName string) (memCapacity, us
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framework.ExpectNoError(err, fmt.Sprintf("failed getting node %s", nodeName))
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nodeOrigCapacity := node.Status.Capacity[v1.ResourceMemory]
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memCapacity = cloneQuantity(nodeOrigCapacity)
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usedMemory = cloneQuantity(nodeOrigCapacity)
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memCapacity = cloneQuantity(&nodeOrigCapacity)
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usedMemory = cloneQuantity(&nodeOrigCapacity)
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usedMemory.Sub(node.Status.Allocatable[v1.ResourceMemory])
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return
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@ -246,7 +446,128 @@ func isNoSwap(f *framework.Framework, pod *v1.Pod) bool {
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return kubeletCfg.MemorySwap.SwapBehavior == types.NoSwap || kubeletCfg.MemorySwap.SwapBehavior == ""
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}
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func cloneQuantity(resource resource.Quantity) *resource.Quantity {
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func cloneQuantity(resource *resource.Quantity) *resource.Quantity {
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clone := resource.DeepCopy()
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return &clone
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}
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func divideQuantity(quantity *resource.Quantity, divideBy int64) *resource.Quantity {
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dividedBigInt := new(big.Int).Div(
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quantity.AsDec().UnscaledBig(),
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big.NewInt(divideBy),
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)
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return resource.NewQuantity(dividedBigInt.Int64(), quantity.Format)
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}
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func multiplyQuantity(quantity *resource.Quantity, multiplier int64) *resource.Quantity {
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product := new(big.Int).Mul(
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quantity.AsDec().UnscaledBig(),
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big.NewInt(multiplier),
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)
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return resource.NewQuantity(product.Int64(), quantity.Format)
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}
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func multiplyQuantities(quantity1, quantity2 *resource.Quantity) *resource.Quantity {
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product := new(big.Int).Mul(quantity1.AsDec().UnscaledBig(), quantity2.AsDec().UnscaledBig())
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return resource.NewQuantity(product.Int64(), quantity1.Format)
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}
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func getPodCgroupPath(pod *v1.Pod) string {
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podQos := qos.GetPodQOS(pod)
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cgroupQosComponent := ""
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switch podQos {
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case v1.PodQOSBestEffort:
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cgroupQosComponent = bestEffortCgroup
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case v1.PodQOSBurstable:
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cgroupQosComponent = burstableCgroup
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}
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var rootCgroupName cm.CgroupName
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if cgroupQosComponent != "" {
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rootCgroupName = cm.NewCgroupName(cm.RootCgroupName, defaultNodeAllocatableCgroup, cgroupQosComponent)
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} else {
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rootCgroupName = cm.NewCgroupName(cm.RootCgroupName, defaultNodeAllocatableCgroup)
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}
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cgroupsToVerify := "pod" + string(pod.UID)
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cgroupName := cm.NewCgroupName(rootCgroupName, cgroupsToVerify)
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cgroupFsPath := toCgroupFsName(cgroupName)
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return filepath.Join(cgroupBasePath, cgroupFsPath)
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}
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func readCgroupFile(pod *v1.Pod, cgroupFile string) (string, error) {
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cgroupPath := getPodCgroupPath(pod)
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cgroupFilePath := filepath.Join(cgroupPath, cgroupFile)
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ginkgo.By("Reading cgroup file: " + cgroupFilePath)
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cmd := "cat " + cgroupFilePath
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outputBytes, err := exec.Command("sudo", "sh", "-c", cmd).CombinedOutput()
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if err != nil {
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return "", fmt.Errorf("error running cmd %s: %w", cmd, err)
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}
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outputStr := strings.TrimSpace(string(outputBytes))
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ginkgo.By("cgroup found value: " + outputStr)
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return outputStr, nil
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}
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func parseBytesStrToQuantity(bytesStr string) (*resource.Quantity, error) {
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bytesInt, err := strconv.ParseInt(bytesStr, 10, 64)
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if err != nil {
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return nil, fmt.Errorf("error parsing swap usage %s to int: %w", bytesStr, err)
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}
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return resource.NewQuantity(bytesInt, resource.BinarySI), nil
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}
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func getSwapUsage(pod *v1.Pod) (*resource.Quantity, error) {
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outputStr, err := readCgroupFile(pod, cgroupV2swapCurrentUsageFile)
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if err != nil {
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return nil, err
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}
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ginkgo.By("swap usage found: " + outputStr + " bytes")
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return parseBytesStrToQuantity(outputStr)
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}
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||||
|
||||
func getMemoryUsage(pod *v1.Pod) (*resource.Quantity, error) {
|
||||
outputStr, err := readCgroupFile(pod, cgroupV2MemoryCurrentUsageFile)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
ginkgo.By("memory usage found: " + outputStr + " bytes")
|
||||
|
||||
return parseBytesStrToQuantity(outputStr)
|
||||
}
|
||||
|
||||
// Sets memory request or limit can be null, then it's dismissed.
|
||||
// Sets the same value for all containers.
|
||||
func setPodMmoryResources(pod *v1.Pod, memoryRequest, memoryLimit *resource.Quantity) {
|
||||
for i := range pod.Spec.Containers {
|
||||
resources := &pod.Spec.Containers[i].Resources
|
||||
|
||||
if memoryRequest != nil {
|
||||
if resources.Requests == nil {
|
||||
resources.Requests = make(map[v1.ResourceName]resource.Quantity)
|
||||
}
|
||||
|
||||
resources.Requests[v1.ResourceMemory] = *memoryRequest
|
||||
}
|
||||
|
||||
if memoryLimit != nil {
|
||||
if resources.Limits == nil {
|
||||
resources.Limits = make(map[v1.ResourceName]resource.Quantity)
|
||||
}
|
||||
|
||||
resources.Limits[v1.ResourceMemory] = *memoryLimit
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user