skip eviction when replica count is below evictor minReplicas threshold setting

Signed-off-by: Amir Alavi <amiralavi7@gmail.com>

pkg/descheduler/pod/pods.go

@@ -142,21 +142,25 @@ func BuildGetPodsAssignedToNodeFunc(podInformer cache.SharedIndexInformer) (GetP
 		if err != nil {
 			return nil, err
 		}
-		pods := make([]*v1.Pod, 0, len(objs))
-		for _, obj := range objs {
-			pod, ok := obj.(*v1.Pod)
-			if !ok {
-				continue
-			}
-			if filter(pod) {
-				pods = append(pods, pod)
-			}
-		}
-		return pods, nil
+		return ConvertToPods(objs, filter), nil
 	}
 	return getPodsAssignedToNode, nil
 }
 
+func ConvertToPods(objs []interface{}, filter FilterFunc) []*v1.Pod {
+	pods := make([]*v1.Pod, 0, len(objs))
+	for _, obj := range objs {
+		pod, ok := obj.(*v1.Pod)
+		if !ok {
+			continue
+		}
+		if filter == nil || filter(pod) {
+			pods = append(pods, pod)
+		}
+	}
+	return pods
+}
+
 // ListPodsOnNodes returns all pods on given nodes.
 func ListPodsOnNodes(nodes []*v1.Node, getPodsAssignedToNode GetPodsAssignedToNodeFunc, filter FilterFunc) ([]*v1.Pod, error) {
 	pods := make([]*v1.Pod, 0)
@@ -215,6 +219,14 @@ func OwnerRef(pod *v1.Pod) []metav1.OwnerReference {
 	return pod.ObjectMeta.GetOwnerReferences()
 }
 
+func OwnerRefUIDs(pod *v1.Pod) []string {
+	var ownerRefUIDs []string
+	for _, ownerRef := range OwnerRef(pod) {
+		ownerRefUIDs = append(ownerRefUIDs, string(ownerRef.UID))
+	}
+	return ownerRefUIDs
+}
+
 func IsBestEffortPod(pod *v1.Pod) bool {
 	return utils.GetPodQOS(pod) == v1.PodQOSBestEffort
 }