generated client-go.

staging/src/k8s.io/client-go/pkg/api/helper/qos/BUILD

+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"])
+
+load(
+    "@io_bazel_rules_go//go:def.bzl",
+    "go_library",
+)
+
+go_library(
+    name = "go_default_library",
+    srcs = ["qos.go"],
+    tags = ["automanaged"],
+    visibility = ["//visibility:private"],
+    deps = [
+        "//vendor/k8s.io/apimachinery/pkg/api/resource:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/util/sets:go_default_library",
+        "//vendor/k8s.io/client-go/pkg/api:go_default_library",
+    ],
+)

staging/src/k8s.io/client-go/pkg/api/helper/qos/qos.go

+/*
+Copyright 2017 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.
+*/
+
+// NOTE: DO NOT use those helper functions through client-go, the
+// package path will be changed in the future.
+package qos
+
+import (
+	"k8s.io/apimachinery/pkg/api/resource"
+	"k8s.io/apimachinery/pkg/util/sets"
+	"k8s.io/client-go/pkg/api"
+)
+
+// supportedComputeResources is the list of compute resources for with QoS is supported.
+var supportedQoSComputeResources = sets.NewString(string(api.ResourceCPU), string(api.ResourceMemory))
+
+// GetPodQOS returns the QoS class of a pod.
+// A pod is besteffort if none of its containers have specified any requests or limits.
+// A pod is guaranteed only when requests and limits are specified for all the containers and they are equal.
+// A pod is burstable if limits and requests do not match across all containers.
+func GetPodQOS(pod *api.Pod) api.PodQOSClass {
+	requests := api.ResourceList{}
+	limits := api.ResourceList{}
+	zeroQuantity := resource.MustParse("0")
+	isGuaranteed := true
+	for _, container := range pod.Spec.Containers {
+		// process requests
+		for name, quantity := range container.Resources.Requests {
+			if !supportedQoSComputeResources.Has(string(name)) {
+				continue
+			}
+			if quantity.Cmp(zeroQuantity) == 1 {
+				delta := quantity.Copy()
+				if _, exists := requests[name]; !exists {
+					requests[name] = *delta
+				} else {
+					delta.Add(requests[name])
+					requests[name] = *delta
+				}
+			}
+		}
+		// process limits
+		qosLimitsFound := sets.NewString()
+		for name, quantity := range container.Resources.Limits {
+			if !supportedQoSComputeResources.Has(string(name)) {
+				continue
+			}
+			if quantity.Cmp(zeroQuantity) == 1 {
+				qosLimitsFound.Insert(string(name))
+				delta := quantity.Copy()
+				if _, exists := limits[name]; !exists {
+					limits[name] = *delta
+				} else {
+					delta.Add(limits[name])
+					limits[name] = *delta
+				}
+			}
+		}
+
+		if len(qosLimitsFound) != len(supportedQoSComputeResources) {
+			isGuaranteed = false
+		}
+	}
+	if len(requests) == 0 && len(limits) == 0 {
+		return api.PodQOSBestEffort
+	}
+	// Check is requests match limits for all resources.
+	if isGuaranteed {
+		for name, req := range requests {
+			if lim, exists := limits[name]; !exists || lim.Cmp(req) != 0 {
+				isGuaranteed = false
+				break
+			}
+		}
+	}
+	if isGuaranteed &&
+		len(requests) == len(limits) {
+		return api.PodQOSGuaranteed
+	}
+	return api.PodQOSBurstable
+}