- Add Extenders() and PluginsRunner interface to PreemptHandle

- Make some private functions stateless
  - make addNominatedPods() not dependent on genericScheduler
  - make addNominatedPods() not dependent on genericScheduler
  - make selectVictimsOnNode() not dependent on genericScheduler
  - make selectNodesForPreemption() not dependent on genericScheduler

pkg/scheduler/core/generic_scheduler.go

@@ -280,7 +280,7 @@ func (g *genericScheduler) Preempt(ctx context.Context, prof *profile.Profile, s
 			return "", nil, nil, err
 		}
 	}
-	nodeNameToVictims, err := g.selectNodesForPreemption(ctx, prof, state, pod, potentialNodes, pdbs)
+	nodeNameToVictims, err := selectNodesForPreemption(ctx, prof, g.podNominator, state, pod, potentialNodes, pdbs)
 	if err != nil {
 		return "", nil, nil, err
 	}
@@ -442,7 +442,7 @@ func (g *genericScheduler) findNodesThatPassFilters(ctx context.Context, prof *p
 		// We check the nodes starting from where we left off in the previous scheduling cycle,
 		// this is to make sure all nodes have the same chance of being examined across pods.
 		nodeInfo := allNodes[(g.nextStartNodeIndex+i)%len(allNodes)]
-		fits, status, err := g.podPassesFiltersOnNode(ctx, prof, state, pod, nodeInfo)
+		fits, status, err := podPassesFiltersOnNode(ctx, prof, g.podNominator, state, pod, nodeInfo)
 		if err != nil {
 			errCh.SendErrorWithCancel(err, cancel)
 			return
@@ -520,12 +520,12 @@ func (g *genericScheduler) findNodesThatPassExtenders(pod *v1.Pod, filtered []*v
 // addNominatedPods adds pods with equal or greater priority which are nominated
 // to run on the node. It returns 1) whether any pod was added, 2) augmented cycleState,
 // 3) augmented nodeInfo.
-func (g *genericScheduler) addNominatedPods(ctx context.Context, prof *profile.Profile, pod *v1.Pod, state *framework.CycleState, nodeInfo *framework.NodeInfo) (bool, *framework.CycleState, *framework.NodeInfo, error) {
+func addNominatedPods(ctx context.Context, pr framework.PluginsRunner, nominator framework.PodNominator, pod *v1.Pod, state *framework.CycleState, nodeInfo *framework.NodeInfo) (bool, *framework.CycleState, *framework.NodeInfo, error) {
-	if g.podNominator == nil || nodeInfo == nil || nodeInfo.Node() == nil {
+	if nominator == nil || nodeInfo == nil || nodeInfo.Node() == nil {
 		// This may happen only in tests.
 		return false, state, nodeInfo, nil
 	}
-	nominatedPods := g.podNominator.NominatedPodsForNode(nodeInfo.Node().Name)
+	nominatedPods := nominator.NominatedPodsForNode(nodeInfo.Node().Name)
 	if len(nominatedPods) == 0 {
 		return false, state, nodeInfo, nil
 	}
@@ -535,7 +535,7 @@ func (g *genericScheduler) addNominatedPods(ctx context.Context, prof *profile.P
 	for _, p := range nominatedPods {
 		if podutil.GetPodPriority(p) >= podutil.GetPodPriority(pod) && p.UID != pod.UID {
 			nodeInfoOut.AddPod(p)
-			status := prof.RunPreFilterExtensionAddPod(ctx, stateOut, pod, p, nodeInfoOut)
+			status := pr.RunPreFilterExtensionAddPod(ctx, stateOut, pod, p, nodeInfoOut)
 			if !status.IsSuccess() {
 				return false, state, nodeInfo, status.AsError()
 			}
@@ -555,9 +555,10 @@ func (g *genericScheduler) addNominatedPods(ctx context.Context, prof *profile.P
 // and add the nominated pods. Removal of the victims is done by
 // SelectVictimsOnNode(). Preempt removes victims from PreFilter state and
 // NodeInfo before calling this function.
-func (g *genericScheduler) podPassesFiltersOnNode(
+func podPassesFiltersOnNode(
 	ctx context.Context,
-	prof *profile.Profile,
+	pr framework.PluginsRunner,
+	nominator framework.PodNominator,
 	state *framework.CycleState,
 	pod *v1.Pod,
 	info *framework.NodeInfo,
@@ -588,7 +589,7 @@ func (g *genericScheduler) podPassesFiltersOnNode(
 		nodeInfoToUse := info
 		if i == 0 {
 			var err error
-			podsAdded, stateToUse, nodeInfoToUse, err = g.addNominatedPods(ctx, prof, pod, state, info)
+			podsAdded, stateToUse, nodeInfoToUse, err = addNominatedPods(ctx, pr, nominator, pod, state, info)
 			if err != nil {
 				return false, nil, err
 			}
@@ -596,7 +597,7 @@ func (g *genericScheduler) podPassesFiltersOnNode(
 			break
 		}
 
-		statusMap := prof.RunFilterPlugins(ctx, stateToUse, pod, nodeInfoToUse)
+		statusMap := pr.RunFilterPlugins(ctx, stateToUse, pod, nodeInfoToUse)
 		status = statusMap.Merge()
 		if !status.IsSuccess() && !status.IsUnschedulable() {
 			return false, status, status.AsError()
@@ -847,9 +848,10 @@ func pickOneNodeForPreemption(nodesToVictims map[string]*extenderv1.Victims) str
 
 // selectNodesForPreemption finds all the nodes with possible victims for
 // preemption in parallel.
-func (g *genericScheduler) selectNodesForPreemption(
+func selectNodesForPreemption(
 	ctx context.Context,
-	prof *profile.Profile,
+	pr framework.PluginsRunner,
+	nominator framework.PodNominator,
 	state *framework.CycleState,
 	pod *v1.Pod,
 	potentialNodes []*framework.NodeInfo,
@@ -861,7 +863,7 @@ func (g *genericScheduler) selectNodesForPreemption(
 	checkNode := func(i int) {
 		nodeInfoCopy := potentialNodes[i].Clone()
 		stateCopy := state.Clone()
-		pods, numPDBViolations, fits := g.selectVictimsOnNode(ctx, prof, stateCopy, pod, nodeInfoCopy, pdbs)
+		pods, numPDBViolations, fits := selectVictimsOnNode(ctx, pr, nominator, stateCopy, pod, nodeInfoCopy, pdbs)
 		if fits {
 			resultLock.Lock()
 			victims := extenderv1.Victims{
@@ -937,9 +939,10 @@ func filterPodsWithPDBViolation(pods []*v1.Pod, pdbs []*policy.PodDisruptionBudg
 // NOTE: This function assumes that it is never called if "pod" cannot be scheduled
 // due to pod affinity, node affinity, or node anti-affinity reasons. None of
 // these predicates can be satisfied by removing more pods from the node.
-func (g *genericScheduler) selectVictimsOnNode(
+func selectVictimsOnNode(
 	ctx context.Context,
-	prof *profile.Profile,
+	pr framework.PluginsRunner,
+	nominator framework.PodNominator,
 	state *framework.CycleState,
 	pod *v1.Pod,
 	nodeInfo *framework.NodeInfo,
@@ -951,7 +954,7 @@ func (g *genericScheduler) selectVictimsOnNode(
 		if err := nodeInfo.RemovePod(rp); err != nil {
 			return err
 		}
-		status := prof.RunPreFilterExtensionRemovePod(ctx, state, pod, rp, nodeInfo)
+		status := pr.RunPreFilterExtensionRemovePod(ctx, state, pod, rp, nodeInfo)
 		if !status.IsSuccess() {
 			return status.AsError()
 		}
@@ -959,7 +962,7 @@ func (g *genericScheduler) selectVictimsOnNode(
 	}
 	addPod := func(ap *v1.Pod) error {
 		nodeInfo.AddPod(ap)
-		status := prof.RunPreFilterExtensionAddPod(ctx, state, pod, ap, nodeInfo)
+		status := pr.RunPreFilterExtensionAddPod(ctx, state, pod, ap, nodeInfo)
 		if !status.IsSuccess() {
 			return status.AsError()
 		}
@@ -982,7 +985,7 @@ func (g *genericScheduler) selectVictimsOnNode(
 	// inter-pod affinity to one or more victims, but we have decided not to
 	// support this case for performance reasons. Having affinity to lower
 	// priority pods is not a recommended configuration anyway.
-	if fits, _, err := g.podPassesFiltersOnNode(ctx, prof, state, pod, nodeInfo); !fits {
+	if fits, _, err := podPassesFiltersOnNode(ctx, pr, nominator, state, pod, nodeInfo); !fits {
 		if err != nil {
 			klog.Warningf("Encountered error while selecting victims on node %v: %v", nodeInfo.Node().Name, err)
 		}
@@ -1000,7 +1003,7 @@ func (g *genericScheduler) selectVictimsOnNode(
 		if err := addPod(p); err != nil {
 			return false, err
 		}
-		fits, _, _ := g.podPassesFiltersOnNode(ctx, prof, state, pod, nodeInfo)
+		fits, _, _ := podPassesFiltersOnNode(ctx, pr, nominator, state, pod, nodeInfo)
 		if !fits {
 			if err := removePod(p); err != nil {
 				return false, err

pkg/scheduler/core/generic_scheduler_test.go

@@ -1632,7 +1632,7 @@ func TestSelectNodesForPreemption(t *testing.T) {
 			if err != nil {
 				t.Fatal(err)
 			}
-			nodeToPods, err := g.selectNodesForPreemption(context.Background(), prof, state, test.pod, nodeInfos, test.pdbs)
+			nodeToPods, err := selectNodesForPreemption(context.Background(), prof, g.podNominator, state, test.pod, nodeInfos, test.pdbs)
 			if err != nil {
 				t.Error(err)
 			}
@@ -1912,7 +1912,7 @@ func TestPickOneNodeForPreemption(t *testing.T) {
 			if !preFilterStatus.IsSuccess() {
 				t.Errorf("Unexpected preFilterStatus: %v", preFilterStatus)
 			}
-			candidateNodes, _ := g.selectNodesForPreemption(context.Background(), prof, state, test.pod, nodeInfos, nil)
+			candidateNodes, _ := selectNodesForPreemption(context.Background(), prof, g.podNominator, state, test.pod, nodeInfos, nil)
 			node := pickOneNodeForPreemption(candidateNodes)
 			found := false
 			for _, nodeName := range test.expected {

pkg/scheduler/framework/v1alpha1/framework.go

@@ -121,6 +121,7 @@ type frameworkOptions struct {
 	snapshotSharedLister SharedLister
 	metricsRecorder      *metricsRecorder
 	podNominator         PodNominator
+	extenders            []Extender
 	runAllFilters        bool
 }
 
@@ -170,10 +171,31 @@ func WithPodNominator(nominator PodNominator) Option {
 	}
 }
 
+// WithExtenders sets extenders for the scheduling framework.
+func WithExtenders(extenders []Extender) Option {
+	return func(o *frameworkOptions) {
+		o.extenders = extenders
+	}
+}
+
 var defaultFrameworkOptions = frameworkOptions{
 	metricsRecorder: newMetricsRecorder(1000, time.Second),
 }
 
+// TODO(#91029): move this to framework runtime package.
+var _ PreemptHandle = &preemptHandle{}
+
+type preemptHandle struct {
+	extenders []Extender
+	PodNominator
+	PluginsRunner
+}
+
+// Extenders returns the registered extenders.
+func (ph *preemptHandle) Extenders() []Extender {
+	return ph.extenders
+}
+
 var _ Framework = &framework{}
 
 // NewFramework initializes plugins given the configuration and the registry.
@@ -191,9 +213,13 @@ func NewFramework(r Registry, plugins *config.Plugins, args []config.PluginConfi
 		clientSet:             options.clientSet,
 		informerFactory:       options.informerFactory,
 		metricsRecorder:       options.metricsRecorder,
-		preemptHandle:         options.podNominator,
 		runAllFilters:         options.runAllFilters,
 	}
+	f.preemptHandle = &preemptHandle{
+		extenders:     options.extenders,
+		PodNominator:  options.podNominator,
+		PluginsRunner: f,
+	}
 	if plugins == nil {
 		return f, nil
 	}

pkg/scheduler/framework/v1alpha1/interface.go

@@ -494,7 +494,12 @@ type FrameworkHandle interface {
 
 // PreemptHandle incorporates all needed logic to run preemption logic.
 type PreemptHandle interface {
+	// PodNominator abstracts operations to maintain nominated Pods.
 	PodNominator
+	// PluginsRunner abstracts operations to run some plugins.
+	PluginsRunner
+	// Extenders returns registered scheduler extenders.
+	Extenders() []Extender
 }
 
 // PodNominator abstracts operations to maintain nominated Pods.
@@ -509,3 +514,15 @@ type PodNominator interface {
 	// NominatedPodsForNode returns nominatedPods on the given node.
 	NominatedPodsForNode(nodeName string) []*v1.Pod
 }
+
+// PluginsRunner abstracts operations to run some plugins.
+// This is used by preemption PostFilter plugins when evaluating the feasibility of
+// scheduling the pod on nodes when certain running pods get evicted.
+type PluginsRunner interface {
+	// RunFilterPlugins runs the set of configured filter plugins for pod on the given node.
+	RunFilterPlugins(context.Context, *CycleState, *v1.Pod, *NodeInfo) PluginToStatus
+	// RunPreFilterExtensionAddPod calls the AddPod interface for the set of configured PreFilter plugins.
+	RunPreFilterExtensionAddPod(ctx context.Context, state *CycleState, podToSchedule *v1.Pod, podToAdd *v1.Pod, nodeInfo *NodeInfo) *Status
+	// RunPreFilterExtensionRemovePod calls the RemovePod interface for the set of configured PreFilter plugins.
+	RunPreFilterExtensionRemovePod(ctx context.Context, state *CycleState, podToSchedule *v1.Pod, podToRemove *v1.Pod, nodeInfo *NodeInfo) *Status
+}

pkg/scheduler/scheduler_test.go

@@ -145,7 +145,8 @@ func (es mockScheduler) Schedule(ctx context.Context, profile *profile.Profile,
 func (es mockScheduler) Extenders() []framework.Extender {
 	return nil
 }
-func (es mockScheduler) Preempt(ctx context.Context, i *profile.Profile, state *framework.CycleState, pod *v1.Pod, scheduleErr error) (string, []*v1.Pod, []*v1.Pod, error) {
+
+func (es mockScheduler) Preempt(ctx context.Context, profile *profile.Profile, state *framework.CycleState, pod *v1.Pod, scheduleErr error) (string, []*v1.Pod, []*v1.Pod, error) {
 	return "", nil, nil, nil
 }