add resourceupdates.Update chan buffer

Signed-off-by: rongfu.leng <lenronfu@gmail.com>

pkg/kubelet/cm/devicemanager/manager.go

@@ -18,6 +18,7 @@ package devicemanager
 
 import (
 	"context"
+	goerrors "errors"
 	"fmt"
 	"os"
 	"path/filepath"
@@ -157,7 +158,7 @@ func newManagerImpl(socketPath string, topology []cadvisorapi.Node, topologyAffi
 		numaNodes:             numaNodes,
 		topologyAffinityStore: topologyAffinityStore,
 		devicesToReuse:        make(PodReusableDevices),
-		update:                make(chan resourceupdates.Update),
+		update:                make(chan resourceupdates.Update, 100),
 	}
 
 	server, err := plugin.NewServer(socketPath, manager, manager)
@@ -309,8 +310,10 @@ func (m *ManagerImpl) genericDeviceUpdateCallback(resourceName string, devices [
 
 	if utilfeature.DefaultFeatureGate.Enabled(features.ResourceHealthStatus) {
 		if len(podsToUpdate) > 0 {
-			m.update <- resourceupdates.Update{
+			select {
-				PodUIDs: podsToUpdate.UnsortedList(),
+			case m.update <- resourceupdates.Update{PodUIDs: podsToUpdate.UnsortedList()}:
+			default:
+				klog.ErrorS(goerrors.New("device update channel is full"), "discard pods info", "podsToUpdate", podsToUpdate.UnsortedList())
 			}
 		}
 	}

pkg/kubelet/cm/devicemanager/manager_test.go

@@ -1970,18 +1970,17 @@ func TestFeatureGateResourceHealthStatus(t *testing.T) {
 	ckm, err := checkpointmanager.NewCheckpointManager(tmpDir)
 	require.NoError(t, err, "err should be nil")
 	resourceName := "domain1.com/resource1"
-	existDevices := map[string]DeviceInstances{
+	existDevices := map[string]DeviceInstances{}
-		resourceName: map[string]pluginapi.Device{
+	resourceNameMap := make(map[string]pluginapi.Device)
-			"dev1": {
+	deviceUpdateNumber, deviceUpdateChanBuffer := 200, 100
-				ID:     "dev1",
+	for i := 0; i < deviceUpdateNumber; i++ {
+		resourceNameMap[fmt.Sprintf("dev%d", i)] = pluginapi.Device{
+			ID:     fmt.Sprintf("dev%d", i),
 			Health: pluginapi.Healthy,
-			},
-			"dev2": {
-				ID:     "dev2",
-				Health: pluginapi.Unhealthy,
-			},
-		},
 		}
+	}
+	existDevices[resourceName] = resourceNameMap
+
 	testManager := &ManagerImpl{
 		allDevices:        ResourceDeviceInstances(existDevices),
 		endpoints:         make(map[string]endpointInfo),
@@ -1990,13 +1989,13 @@ func TestFeatureGateResourceHealthStatus(t *testing.T) {
 		allocatedDevices:  make(map[string]sets.Set[string]),
 		podDevices:        newPodDevices(),
 		checkpointManager: ckm,
-		update:            make(chan resourceupdates.Update),
+		update:            make(chan resourceupdates.Update, deviceUpdateChanBuffer),
 	}
 
-	podID := "pod1"
+	for i := 0; i < deviceUpdateNumber; i++ {
-	contID := "con1"
+		podID := fmt.Sprintf("pod%d", i)
-	devices := checkpoint.DevicesPerNUMA{0: []string{"dev1"}, 1: []string{"dev1"}}
+		contID := fmt.Sprintf("con%d", i)
-
+		devices := checkpoint.DevicesPerNUMA{0: []string{fmt.Sprintf("dev%d", i)}}
 		testManager.podDevices.insert(podID, contID, resourceName,
 			devices,
 			newContainerAllocateResponse(
@@ -2004,29 +2003,28 @@ func TestFeatureGateResourceHealthStatus(t *testing.T) {
 				withMounts(map[string]string{"/home/r1lib1": "/usr/r1lib1"}),
 			),
 		)
+	}
+
 	featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.ResourceHealthStatus, true)
 
+	for i := 0; i < deviceUpdateNumber; i++ {
 		testManager.genericDeviceUpdateCallback(resourceName, []pluginapi.Device{
 			{ID: "dev1", Health: pluginapi.Healthy},
-		{ID: "dev2", Health: pluginapi.Unhealthy},
 		})
+	}
 	// update chan no data
 	assert.Empty(t, testManager.update)
 
-	// update chan receive pod1
+	// update device status, assume all device unhealthy.
-	var wg sync.WaitGroup
+	for i := 0; i < deviceUpdateNumber; i++ {
-	go func() {
+		testManager.genericDeviceUpdateCallback(resourceName, []pluginapi.Device{
-		defer wg.Done()
+			{ID: fmt.Sprintf("dev%d", i), Health: pluginapi.Unhealthy},
+		})
+	}
+	for i := 0; i < deviceUpdateChanBuffer; i++ {
 		u := <-testManager.update
 		assert.Equal(t, resourceupdates.Update{
-			PodUIDs: []string{"pod1"},
+			PodUIDs: []string{fmt.Sprintf("pod%d", i)},
 		}, u)
-	}()
+	}
-	wg.Add(1)
-	testManager.genericDeviceUpdateCallback(resourceName, []pluginapi.Device{
-		{ID: "dev1", Health: pluginapi.Unhealthy},
-		{ID: "dev2", Health: pluginapi.Healthy},
-	})
-	wg.Wait()
-
 }