Enable allocatable support for Windows nodes

pkg/kubelet/cm/helpers.go

@@ -0,0 +1,46 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package cm
+
+import (
+	"k8s.io/api/core/v1"
+	evictionapi "k8s.io/kubernetes/pkg/kubelet/eviction/api"
+)
+
+// hardEvictionReservation returns a resourcelist that includes reservation of resources based on hard eviction thresholds.
+func hardEvictionReservation(thresholds []evictionapi.Threshold, capacity v1.ResourceList) v1.ResourceList {
+	if len(thresholds) == 0 {
+		return nil
+	}
+	ret := v1.ResourceList{}
+	for _, threshold := range thresholds {
+		if threshold.Operator != evictionapi.OpLessThan {
+			continue
+		}
+		switch threshold.Signal {
+		case evictionapi.SignalMemoryAvailable:
+			memoryCapacity := capacity[v1.ResourceMemory]
+			value := evictionapi.GetThresholdQuantity(threshold.Value, &memoryCapacity)
+			ret[v1.ResourceMemory] = *value
+		case evictionapi.SignalNodeFsAvailable:
+			storageCapacity := capacity[v1.ResourceEphemeralStorage]
+			value := evictionapi.GetThresholdQuantity(threshold.Value, &storageCapacity)
+			ret[v1.ResourceEphemeralStorage] = *value
+		}
+	}
+	return ret
+}