Fix pod scale down failure in EventHandlingPodUpdate scheduler_perf test case

Author: macsko

test/integration/scheduler_perf/event_handling/performance-config.yaml

@@ -228,13 +228,20 @@
     stageRequirement: Attempted
     labelSelector:
       type: unsched
-  # Update blocker pods' labels and scale down their resource requests 
-  # to make the unschedulable pods schedulable.
+  # Update blocker pods' labels to make the unschedulable pods schedulable.
   - opcode: updateAny
     countParam: $blockerPods
     templatePath: templates/podupdate-pod-blocker-update.yaml
     updatePerSecond: 100
     namespace: blocker
+  # Scale down blocker pods' resource requests to make the unschedulable pods schedulable.
+  - opcode: updateAny
+    countParam: $blockerPods
+    templatePath: templates/podupdate-pod-blocker-scale-down.yaml
+    updatePerSecond: 100
+    namespace: blocker
+    subresources:
+      - resize
   # Update pods blocked by SchedulingGates by removing the gate from themselves.
   - opcode: updateAny
     countParam: $measurePods

test/integration/scheduler_perf/event_handling/templates/podupdate-pod-blocker-scale-down.yaml

@@ -0,0 +1,13 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: pod-blocker-{{ .Index }}
+spec:
+  containers:
+  - image: registry.k8s.io/pause:3.10
+    name: pause
+    resources:
+      requests:
+        cpu: 0.0001
+        memory: 1Mi
+  nodeName: scheduler-perf-node

test/integration/scheduler_perf/event_handling/templates/podupdate-pod-blocker-update.yaml

@@ -9,5 +9,5 @@ spec:
     resources:
       requests:
         cpu: 0.0001
-        memory: 1Mi
+        memory: {{ div 30000 .Count }}Mi
   nodeName: scheduler-perf-node

test/integration/scheduler_perf/update.go

@@ -49,6 +49,10 @@ type updateAny struct {
 	UpdatePerSecond int
 	// Internal field of the struct used for caching the mapping.
 	cachedMapping *meta.RESTMapping
+	// List of subresources to update.
+	// If empty, update operation is performed on the actual resource.
+	// Optional
+	Subresources []string
 }
 
 var _ runnableOp = &updateAny{}
@@ -145,7 +149,7 @@ func (c *updateAny) update(tCtx ktesting.TContext, env map[string]any) error {
 		if c.cachedMapping.Scope.Name() != meta.RESTScopeNameNamespace {
 			return fmt.Errorf("namespace %q set for %q, but %q has scope %q", c.Namespace, c.TemplatePath, c.cachedMapping.GroupVersionKind, c.cachedMapping.Scope.Name())
 		}
-		_, err := resourceClient.Namespace(c.Namespace).Update(tCtx, obj, options)
+		_, err := resourceClient.Namespace(c.Namespace).Update(tCtx, obj, options, c.Subresources...)
 		if err != nil {
 			return fmt.Errorf("failed to update object in namespace %q: %w", c.Namespace, err)
 		}
@@ -158,7 +162,7 @@ func (c *updateAny) update(tCtx ktesting.TContext, env map[string]any) error {
 	if c.cachedMapping.Scope.Name() != meta.RESTScopeNameRoot {
 		return fmt.Errorf("namespace not set for %q, but %q has scope %q", c.TemplatePath, c.cachedMapping.GroupVersionKind, c.cachedMapping.Scope.Name())
 	}
-	_, err := resourceClient.Update(tCtx, obj, options)
+	_, err := resourceClient.Update(tCtx, obj, options, c.Subresources...)
 	if err != nil {
 		return fmt.Errorf("failed to update object: %w", err)
 	}