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95 lines
2.8 KiB
Go
95 lines
2.8 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// NOTE: DO NOT use those helper functions through client-go, the
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// package path will be changed in the future.
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package qos
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import (
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"k8s.io/apimachinery/pkg/api/resource"
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"k8s.io/apimachinery/pkg/util/sets"
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"k8s.io/kubernetes/pkg/api"
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)
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// supportedComputeResources is the list of compute resources for with QoS is supported.
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var supportedQoSComputeResources = sets.NewString(string(api.ResourceCPU), string(api.ResourceMemory))
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// GetPodQOS returns the QoS class of a pod.
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// A pod is besteffort if none of its containers have specified any requests or limits.
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// A pod is guaranteed only when requests and limits are specified for all the containers and they are equal.
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// A pod is burstable if limits and requests do not match across all containers.
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func GetPodQOS(pod *api.Pod) api.PodQOSClass {
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requests := api.ResourceList{}
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limits := api.ResourceList{}
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zeroQuantity := resource.MustParse("0")
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isGuaranteed := true
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for _, container := range pod.Spec.Containers {
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// process requests
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for name, quantity := range container.Resources.Requests {
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if !supportedQoSComputeResources.Has(string(name)) {
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continue
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}
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if quantity.Cmp(zeroQuantity) == 1 {
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delta := quantity.Copy()
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if _, exists := requests[name]; !exists {
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requests[name] = *delta
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} else {
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delta.Add(requests[name])
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requests[name] = *delta
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}
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}
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}
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// process limits
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qosLimitsFound := sets.NewString()
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for name, quantity := range container.Resources.Limits {
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if !supportedQoSComputeResources.Has(string(name)) {
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continue
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}
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if quantity.Cmp(zeroQuantity) == 1 {
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qosLimitsFound.Insert(string(name))
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delta := quantity.Copy()
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if _, exists := limits[name]; !exists {
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limits[name] = *delta
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} else {
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delta.Add(limits[name])
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limits[name] = *delta
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}
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}
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}
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if len(qosLimitsFound) != len(supportedQoSComputeResources) {
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isGuaranteed = false
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}
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}
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if len(requests) == 0 && len(limits) == 0 {
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return api.PodQOSBestEffort
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}
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// Check is requests match limits for all resources.
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if isGuaranteed {
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for name, req := range requests {
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if lim, exists := limits[name]; !exists || lim.Cmp(req) != 0 {
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isGuaranteed = false
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break
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}
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}
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}
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if isGuaranteed &&
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len(requests) == len(limits) {
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return api.PodQOSGuaranteed
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}
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return api.PodQOSBurstable
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}
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