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8a908e0c0b
The "// import <path>" comment has been superseded by Go modules. We don't have to remove them, but doing so has some advantages: - They are used inconsistently, which is confusing. - We can then also remove the (currently broken) hack/update-vanity-imports.sh. - Last but not least, it would be a first step towards avoiding the k8s.io domain. This commit was generated with sed -i -e 's;^package \(.*\) // import.*;package \1;' $(git grep -l '^package.*// import' | grep -v 'vendor/') Everything was included, except for package labels // import k8s.io/kubernetes/pkg/util/labels because that package is marked as "read-only".
72 lines
2.9 KiB
Go
72 lines
2.9 KiB
Go
/*
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Copyright 2024 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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// Package qos contains helper functions for quality of service.
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// For each resource (memory, CPU) Kubelet supports three classes of containers.
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// Memory guaranteed containers will receive the highest priority and will get all the resources
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// they need.
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// Burstable containers will be guaranteed their request and can "burst" and use more resources
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// when available.
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// Best-Effort containers, which don't specify a request, can use resources only if not being used
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// by other pods.
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package qos
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import (
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v1 "k8s.io/api/core/v1"
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resourcehelper "k8s.io/component-helpers/resource"
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)
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// minRegularContainerMemory returns the minimum memory resource quantity
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// across all regular containers in pod.Spec.Containers.
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// It does not include initContainers (both restartable and non-restartable).
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func minRegularContainerMemory(pod v1.Pod) int64 {
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memoryValue := pod.Spec.Containers[0].Resources.Requests.Memory().Value()
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for _, container := range pod.Spec.Containers[1:] {
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if container.Resources.Requests.Memory().Value() < memoryValue {
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memoryValue = container.Resources.Requests.Memory().Value()
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}
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}
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return memoryValue
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}
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// remainingPodMemReqPerContainer calculates the remaining pod memory request per
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// container by:
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// 1. Taking the total pod memory requests
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// 2. Subtracting total container memory requests from pod memory requests
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// 3. Dividing the remainder by the number of containers.
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// This gives us the additional memory request that is not allocated to any
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// containers in the pod. This value will be divided equally among all containers to
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// calculate oom score adjusment.
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// See https://github.com/kubernetes/enhancements/blob/master/keps/sig-node/2837-pod-level-resource-spec/README.md#oom-score-adjustment
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// for more details.
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func remainingPodMemReqPerContainer(pod *v1.Pod) int64 {
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var remainingMemory int64
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if pod.Spec.Resources.Requests.Memory().IsZero() {
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return remainingMemory
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}
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numContainers := len(pod.Spec.Containers) + len(pod.Spec.InitContainers)
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// Aggregated requests of all containers.
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aggrContainerReqs := resourcehelper.AggregateContainerRequests(pod, resourcehelper.PodResourcesOptions{})
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remainingMemory = pod.Spec.Resources.Requests.Memory().Value() - aggrContainerReqs.Memory().Value()
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remainingMemoryPerContainer := remainingMemory / int64(numContainers)
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return remainingMemoryPerContainer
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}
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