Taint node when it under PID pressure.

pkg/controller/nodelifecycle/node_lifecycle_controller.go

@@ -89,6 +89,7 @@ var (
 		v1.NodeOutOfDisk:          algorithm.TaintNodeOutOfDisk,
 		v1.NodeDiskPressure:       algorithm.TaintNodeDiskPressure,
 		v1.NodeNetworkUnavailable: algorithm.TaintNodeNetworkUnavailable,
+		v1.NodePIDPressure:        algorithm.TaintNodePIDPressure,
 	}
 
 	taintKeyToNodeConditionMap = map[string]v1.NodeConditionType{
@@ -96,6 +97,7 @@ var (
 		algorithm.TaintNodeMemoryPressure:     v1.NodeMemoryPressure,
 		algorithm.TaintNodeOutOfDisk:          v1.NodeOutOfDisk,
 		algorithm.TaintNodeDiskPressure:       v1.NodeDiskPressure,
+		algorithm.TaintNodePIDPressure:        v1.NodePIDPressure,
 	}
 )
 

pkg/scheduler/algorithm/well_known_labels.go

@@ -56,6 +56,11 @@ const (
 	// and removed when network becomes ready.
 	TaintNodeNetworkUnavailable = "node.kubernetes.io/network-unavailable"
 
+	// TaintNodePIDPressure will be added when node has pid pressure
+	// and feature-gate for TaintNodesByCondition flag is enabled,
+	// and removed when node has enough disk.
+	TaintNodePIDPressure = "node.kubernetes.io/pid-pressure"
+
 	// TaintExternalCloudProvider sets this taint on a node to mark it as unusable,
 	// when kubelet is started with the "external" cloud provider, until a controller
 	// from the cloud-controller-manager intitializes this node, and then removes