kubelet: add cgroup manager metrics

pkg/kubelet/cm/BUILD

@@ -30,6 +30,7 @@ go_library(
         "//pkg/kubelet/cm/util:go_default_library",
         "//pkg/kubelet/events:go_default_library",
         "//pkg/kubelet/eviction/api:go_default_library",
+        "//pkg/kubelet/metrics:go_default_library",
         "//pkg/kubelet/qos:go_default_library",
         "//pkg/util:go_default_library",
         "//pkg/util/mount:go_default_library",

pkg/kubelet/cm/cgroup_manager_linux.go

@@ -22,6 +22,7 @@ import (
 	"path"
 	"path/filepath"
 	"strings"
+	"time"
 
 	"github.com/golang/glog"
 	libcontainercgroups "github.com/opencontainers/runc/libcontainer/cgroups"
@@ -29,6 +30,7 @@ import (
 	cgroupsystemd "github.com/opencontainers/runc/libcontainer/cgroups/systemd"
 	libcontainerconfigs "github.com/opencontainers/runc/libcontainer/configs"
 	"k8s.io/apimachinery/pkg/util/sets"
+	"k8s.io/kubernetes/pkg/kubelet/metrics"
 )
 
 // libcontainerCgroupManagerType defines how to interface with libcontainer
@@ -237,6 +239,11 @@ func (m *cgroupManagerImpl) Exists(name CgroupName) bool {
 
 // Destroy destroys the specified cgroup
 func (m *cgroupManagerImpl) Destroy(cgroupConfig *CgroupConfig) error {
+	start := time.Now()
+	defer func() {
+		metrics.CgroupManagerLatency.WithLabelValues("destroy").Observe(metrics.SinceInMicroseconds(start))
+	}()
+
 	cgroupPaths := m.buildCgroupPaths(cgroupConfig.Name)
 
 	// we take the location in traditional cgroupfs format.
@@ -329,6 +336,11 @@ func (m *cgroupManagerImpl) toResources(resourceConfig *ResourceConfig) *libcont
 
 // Update updates the cgroup with the specified Cgroup Configuration
 func (m *cgroupManagerImpl) Update(cgroupConfig *CgroupConfig) error {
+	start := time.Now()
+	defer func() {
+		metrics.CgroupManagerLatency.WithLabelValues("update").Observe(metrics.SinceInMicroseconds(start))
+	}()
+
 	// Extract the cgroup resource parameters
 	resourceConfig := cgroupConfig.ResourceParameters
 	resources := m.toResources(resourceConfig)
@@ -364,6 +376,10 @@ func (m *cgroupManagerImpl) Update(cgroupConfig *CgroupConfig) error {
 
 // Create creates the specified cgroup
 func (m *cgroupManagerImpl) Create(cgroupConfig *CgroupConfig) error {
+	start := time.Now()
+	defer func() {
+		metrics.CgroupManagerLatency.WithLabelValues("create").Observe(metrics.SinceInMicroseconds(start))
+	}()
 
 	// we take the location in traditional cgroupfs format.
 	abstractCgroupFsName := string(cgroupConfig.Name)

pkg/kubelet/container/BUILD

@@ -29,7 +29,6 @@ go_library(
         "//pkg/api:go_default_library",
         "//pkg/api/v1:go_default_library",
         "//pkg/kubelet/api/v1alpha1/runtime:go_default_library",
-        "//pkg/kubelet/cm:go_default_library",
         "//pkg/kubelet/events:go_default_library",
         "//pkg/kubelet/util/format:go_default_library",
         "//pkg/kubelet/util/ioutils:go_default_library",

pkg/kubelet/container/helpers.go

@@ -33,7 +33,6 @@ import (
 	"k8s.io/client-go/tools/record"
 	"k8s.io/kubernetes/pkg/api/v1"
 	runtimeapi "k8s.io/kubernetes/pkg/kubelet/api/v1alpha1/runtime"
-	"k8s.io/kubernetes/pkg/kubelet/cm"
 	"k8s.io/kubernetes/pkg/kubelet/events"
 	"k8s.io/kubernetes/pkg/kubelet/util/format"
 	"k8s.io/kubernetes/pkg/kubelet/util/ioutils"
@@ -53,7 +52,7 @@ type RuntimeHelper interface {
 	GetClusterDNS(pod *v1.Pod) (dnsServers []string, dnsSearches []string, useClusterFirstPolicy bool, err error)
 	// GetPodCgroupParent returns the the CgroupName identifer, and its literal cgroupfs form on the host
 	// of a pod.
-	GetPodCgroupParent(pod *v1.Pod) (cm.CgroupName, string)
+	GetPodCgroupParent(pod *v1.Pod) string
 	GetPodDir(podUID types.UID) string
 	GeneratePodHostNameAndDomain(pod *v1.Pod) (hostname string, hostDomain string, err error)
 	// GetExtraSupplementalGroupsForPod returns a list of the extra

pkg/kubelet/container/testing/BUILD

@@ -20,7 +20,6 @@ go_library(
     tags = ["automanaged"],
     deps = [
         "//pkg/api/v1:go_default_library",
-        "//pkg/kubelet/cm:go_default_library",
         "//pkg/kubelet/container:go_default_library",
         "//pkg/util/term:go_default_library",
         "//pkg/volume:go_default_library",

pkg/kubelet/container/testing/fake_runtime_helper.go

@@ -19,7 +19,6 @@ package testing
 import (
 	kubetypes "k8s.io/apimachinery/pkg/types"
 	"k8s.io/kubernetes/pkg/api/v1"
-	"k8s.io/kubernetes/pkg/kubelet/cm"
 	kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
 )
 
@@ -41,8 +40,8 @@ func (f *FakeRuntimeHelper) GenerateRunContainerOptions(pod *v1.Pod, container *
 	return &opts, false, nil
 }
 
-func (f *FakeRuntimeHelper) GetPodCgroupParent(pod *v1.Pod) (cm.CgroupName, string) {
+func (f *FakeRuntimeHelper) GetPodCgroupParent(pod *v1.Pod) string {
-	return "", ""
+	return ""
 }
 
 func (f *FakeRuntimeHelper) GetClusterDNS(pod *v1.Pod) ([]string, []string, bool, error) {

pkg/kubelet/kubelet_pods.go

@@ -267,9 +267,10 @@ func (kl *Kubelet) GeneratePodHostNameAndDomain(pod *v1.Pod) (string, string, er
 }
 
 // GetPodCgroupParent gets pod cgroup parent from container manager.
-func (kl *Kubelet) GetPodCgroupParent(pod *v1.Pod) (cm.CgroupName, string) {
+func (kl *Kubelet) GetPodCgroupParent(pod *v1.Pod) string {
 	pcm := kl.containerManager.NewPodContainerManager()
-	return pcm.GetPodContainerName(pod)
+	_, cgroupParent := pcm.GetPodContainerName(pod)
+	return cgroupParent
 }
 
 // GenerateRunContainerOptions generates the RunContainerOptions, which can be used by
@@ -277,7 +278,7 @@ func (kl *Kubelet) GetPodCgroupParent(pod *v1.Pod) (cm.CgroupName, string) {
 func (kl *Kubelet) GenerateRunContainerOptions(pod *v1.Pod, container *v1.Container, podIP string) (*kubecontainer.RunContainerOptions, bool, error) {
 	var err error
 	useClusterFirstPolicy := false
-	_, cgroupParent := kl.GetPodCgroupParent(pod)
+	cgroupParent := kl.GetPodCgroupParent(pod)
 	opts := &kubecontainer.RunContainerOptions{CgroupParent: cgroupParent}
 	hostname, hostDomainName, err := kl.GeneratePodHostNameAndDomain(pod)
 	if err != nil {

pkg/kubelet/kuberuntime/kuberuntime_sandbox.go

@@ -114,7 +114,7 @@ func (m *kubeGenericRuntimeManager) generatePodSandboxConfig(pod *v1.Pod, attemp
 
 	}
 
-	_, cgroupParent := m.runtimeHelper.GetPodCgroupParent(pod)
+	cgroupParent := m.runtimeHelper.GetPodCgroupParent(pod)
 	podSandboxConfig.Linux = m.generatePodSandboxLinuxConfig(pod, cgroupParent)
 	if len(portMappings) > 0 {
 		podSandboxConfig.PortMappings = portMappings

pkg/kubelet/metrics/metrics.go

@@ -32,6 +32,7 @@ const (
 	PodStartLatencyKey            = "pod_start_latency_microseconds"
 	PodStatusLatencyKey           = "generate_pod_status_latency_microseconds"
 	ContainerManagerOperationsKey = "container_manager_latency_microseconds"
+	CgroupManagerOperationsKey    = "cgroup_manager_latency_microseconds"
 	DockerOperationsLatencyKey    = "docker_operations_latency_microseconds"
 	DockerOperationsKey           = "docker_operations"
 	DockerOperationsErrorsKey     = "docker_operations_errors"
@@ -90,6 +91,14 @@ var (
 		},
 		[]string{"operation_type"},
 	)
+	CgroupManagerLatency = prometheus.NewSummaryVec(
+		prometheus.SummaryOpts{
+			Subsystem: KubeletSubsystem,
+			Name:      CgroupManagerOperationsKey,
+			Help:      "Latency in microseconds for cgroup manager operations. Broken down by method.",
+		},
+		[]string{"operation_type"},
+	)
 	PodWorkerStartLatency = prometheus.NewSummary(
 		prometheus.SummaryOpts{
 			Subsystem: KubeletSubsystem,
@@ -182,6 +191,7 @@ func Register(containerCache kubecontainer.RuntimeCache) {
 		prometheus.MustRegister(PodStatusLatency)
 		prometheus.MustRegister(DockerOperationsLatency)
 		prometheus.MustRegister(ContainerManagerLatency)
+		prometheus.MustRegister(CgroupManagerLatency)
 		prometheus.MustRegister(SyncPodsLatency)
 		prometheus.MustRegister(PodWorkerStartLatency)
 		prometheus.MustRegister(ContainersPerPodCount)

test/e2e/framework/kubelet_stats.go

@@ -106,6 +106,7 @@ func GetKubeletLatencyMetrics(ms metrics.KubeletMetrics) KubeletLatencyMetrics {
 		kubeletmetrics.PodStartLatencyKey,
 		kubeletmetrics.PodStatusLatencyKey,
 		kubeletmetrics.ContainerManagerOperationsKey,
+		kubeletmetrics.CgroupManagerOperationsKey,
 		kubeletmetrics.DockerOperationsLatencyKey,
 		kubeletmetrics.PodWorkerStartLatencyKey,
 		kubeletmetrics.PLEGRelistLatencyKey,