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75 lines
3.0 KiB
Go
75 lines
3.0 KiB
Go
/*
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Copyright 2015 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
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import (
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v1 "k8s.io/api/core/v1"
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v1qos "k8s.io/kubernetes/pkg/apis/core/v1/helper/qos"
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"k8s.io/kubernetes/pkg/kubelet/types"
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)
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const (
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// KubeletOOMScoreAdj is the OOM score adjustment for Kubelet
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KubeletOOMScoreAdj int = -999
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// KubeProxyOOMScoreAdj is the OOM score adjustment for kube-proxy
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KubeProxyOOMScoreAdj int = -999
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guaranteedOOMScoreAdj int = -997
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besteffortOOMScoreAdj int = 1000
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)
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// GetContainerOOMScoreAdjust returns the amount by which the OOM score of all processes in the
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// container should be adjusted.
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// The OOM score of a process is the percentage of memory it consumes
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// multiplied by 10 (barring exceptional cases) + a configurable quantity which is between -1000
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// and 1000. Containers with higher OOM scores are killed if the system runs out of memory.
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// See https://lwn.net/Articles/391222/ for more information.
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func GetContainerOOMScoreAdjust(pod *v1.Pod, container *v1.Container, memoryCapacity int64) int {
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if types.IsCriticalPod(pod) {
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// Critical pods should be the last to get killed.
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return guaranteedOOMScoreAdj
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}
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switch v1qos.GetPodQOS(pod) {
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case v1.PodQOSGuaranteed:
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// Guaranteed containers should be the last to get killed.
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return guaranteedOOMScoreAdj
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case v1.PodQOSBestEffort:
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return besteffortOOMScoreAdj
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}
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// Burstable containers are a middle tier, between Guaranteed and Best-Effort. Ideally,
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// we want to protect Burstable containers that consume less memory than requested.
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// The formula below is a heuristic. A container requesting for 10% of a system's
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// memory will have an OOM score adjust of 900. If a process in container Y
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// uses over 10% of memory, its OOM score will be 1000. The idea is that containers
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// which use more than their request will have an OOM score of 1000 and will be prime
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// targets for OOM kills.
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// Note that this is a heuristic, it won't work if a container has many small processes.
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memoryRequest := container.Resources.Requests.Memory().Value()
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oomScoreAdjust := 1000 - (1000*memoryRequest)/memoryCapacity
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// A guaranteed pod using 100% of memory can have an OOM score of 10. Ensure
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// that burstable pods have a higher OOM score adjustment.
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if int(oomScoreAdjust) < (1000 + guaranteedOOMScoreAdj) {
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return (1000 + guaranteedOOMScoreAdj)
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}
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// Give burstable pods a higher chance of survival over besteffort pods.
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if int(oomScoreAdjust) == besteffortOOMScoreAdj {
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return int(oomScoreAdjust - 1)
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}
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return int(oomScoreAdjust)
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}
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