Merge pull request #28387 from caesarxuchao/gc-latency-measure

Automatic merge from submit-queue

[GarbageCollector] measure latency

First commit is #27600.

In e2e tests, I measure the average time an item spend in the eventQueue(~1.5 ms), dirtyQueue(~13ms), and orphanQueue(~37ms). There is no stress test in e2e yet, so the number may not be useful.

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pkg/controller/garbagecollector/garbagecollector_test.go

@@ -35,6 +35,7 @@ import (
 	"k8s.io/kubernetes/pkg/client/restclient"
 	"k8s.io/kubernetes/pkg/client/typed/dynamic"
 	"k8s.io/kubernetes/pkg/types"
+	"k8s.io/kubernetes/pkg/util/clock"
 	"k8s.io/kubernetes/pkg/util/json"
 	"k8s.io/kubernetes/pkg/util/sets"
 	"k8s.io/kubernetes/pkg/util/workqueue"
@@ -282,13 +283,14 @@ func TestProcessEvent(t *testing.T) {
 
 	for _, scenario := range testScenarios {
 		propagator := &Propagator{
-			eventQueue: workqueue.New(),
+			eventQueue: workqueue.NewTimedWorkQueue(clock.RealClock{}),
 			uidToNode: &concurrentUIDToNode{
 				RWMutex:   &sync.RWMutex{},
 				uidToNode: make(map[types.UID]*node),
 			},
 			gc: &GarbageCollector{
-				dirtyQueue: workqueue.New(),
+				dirtyQueue: workqueue.NewTimedWorkQueue(clock.RealClock{}),
+				clock:      clock.RealClock{},
 			},
 		}
 		for i := 0; i < len(scenario.events); i++ {