pod:   st.MakePod().Name("test-prefilter").UID("test-prefilter").Obj(),
			wErr: &framework.FitError{
				Pod:         st.MakePod().Name("test-prefilter").UID("test-prefilter").Obj(),
				NumAllNodes: 2,
				Diagnosis: framework.Diagnosis{
					NodeToStatusMap: framework.NodeToStatusMap{
						"node2": framework.NewStatus(framework.Unschedulable, "injecting failure for pod test-prefilter").WithPlugin("FakeFilter"),
					},

	reqs := resource.PodRequests(pod, resource.PodResourcesOptions{})
	result := &preFilterState{}
	result.SetMaxResource(reqs)
	return result
}

// PreFilter invoked at the prefilter extension point.
func (f *Fit) PreFilter(ctx context.Context, cycleState *framework.CycleState, pod *v1.Pod) (*framework.PreFilterResult, *framework.Status) {
	if !f.enableSidecarContainers && hasRestartableInitContainer(pod) {

	preFilterMsg := f.Diagnosis.PreFilterMsg
	if preFilterMsg != "" {
		// PreFilter plugin returns unschedulable.
		// Add the messages from PreFilter plugins to reasonMsg.
		reasonMsg += fmt.Sprintf(" %v.", preFilterMsg)
	}

	if preFilterMsg == "" {
		// the scheduling cycle went through PreFilter extension point successfully.
		//
		// When the prefilter plugin returns unschedulable,

			if err != nil {
				t.Fatal(err)
			}
			cycleState := framework.NewCycleState()
			_, preFilterStatus := p.(framework.PreFilterPlugin).PreFilter(ctx, cycleState, test.pod)
			if !preFilterStatus.IsSuccess() {
				t.Errorf("prefilter failed with status: %v", preFilterStatus)
			}

			gotStatus := p.(framework.FilterPlugin).Filter(ctx, cycleState, test.pod, test.nodeInfo)

		for _, n := range allNodes {
			diagnosis.NodeToStatusMap[n.Node().Name] = s
		}

		// Record the messages from PreFilter in Diagnosis.PreFilterMsg.
		msg := s.Message()
		diagnosis.PreFilterMsg = msg
		logger.V(5).Info("Status after running PreFilter plugins for pod", "pod", klog.KObj(pod), "status", msg)
		diagnosis.AddPluginStatus(s)
		return nil, diagnosis, nil
	}

- Improved scheduling performance when many nodes, and prefilter returns 1-2 nodes (e.g. daemonset)
  

- Fixed a `1.27` scheduling regression that `PostFilter` plugin may not function if previous `PreFilter` plugins return `Skip`. ([#119769](https://github.com/kubernetes/kubernetes/pull/119769), [@Huang-Wei](https://github.com/Huang-Wei))

rejected via `UnschedulableAndUnresolvable`. Consequently, these nodes are excluded from the candidates for the preemption process. Additionally, this update corrects how the scheduling framework handles the Unschedulable status from PreFilter. Previously, if PreFilter returned `Unschedulable`, it could lead to an unexpected abortion in the preemption process, which shouldn't occur in the default scheduler but might occur in schedulers with custom plugins. ([#119779](https://github.com/kubernetes/...

- Scheduler no longer runs the plugin's `Filter` method when its `PreFilter` method returned a Skip status.
  In other words, your `PreFilter`/`Filter` plugin can return a Skip status in `PreFilter` if the plugin does nothing in Filter for that Pod.
  Scheduler skips `NodeAffinity` Filter plugin when `NodeAffinity` Filter plugin has nothing to do with a Pod.

- Fixed a 1.26 regression scheduling bug by ensuring that preemption is skipped when a PreFilter plugin returns `UnschedulableAndUnresolvable` ([#119951](https://github.com/kubernetes/kubernetes/pull/119951), [@sanposhiho](https://github.com/sanposhiho)) [SIG Scheduling]