102 lines
3.1 KiB
Go
102 lines
3.1 KiB
Go
//go:build windows
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// +build windows
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/*
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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 eviction
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import (
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"fmt"
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"time"
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"k8s.io/apimachinery/pkg/api/resource"
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"k8s.io/klog/v2"
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statsapi "k8s.io/kubelet/pkg/apis/stats/v1alpha1"
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evictionapi "k8s.io/kubernetes/pkg/kubelet/eviction/api"
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"k8s.io/kubernetes/pkg/kubelet/winstats"
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)
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type windowsMemoryThresholdNotifier struct {
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threshold evictionapi.Threshold
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events chan struct{}
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handler func(string)
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}
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var _ ThresholdNotifier = &windowsMemoryThresholdNotifier{}
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func NewMemoryThresholdNotifier(threshold evictionapi.Threshold, cgroupRoot string, factory NotifierFactory, handler func(string)) (ThresholdNotifier, error) {
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klog.InfoS("Eviction manager: creating new WindowsMemoryThresholdNotifier")
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return &windowsMemoryThresholdNotifier{
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threshold: threshold,
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events: make(chan struct{}),
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handler: handler,
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}, nil
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}
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func (m *windowsMemoryThresholdNotifier) Start() {
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klog.InfoS("Eviction manager: starting windowsMemoryThresholdNotifier", "notifier", m.Description())
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go func() {
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for true {
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time.Sleep(notifierRefreshInterval)
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m.checkMemoryUsage()
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}
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}()
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for range m.events {
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m.handler(fmt.Sprintf("eviction manager: %s crossed", m.Description()))
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}
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}
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func (m *windowsMemoryThresholdNotifier) checkMemoryUsage() {
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// Get global commit limit
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perfInfo, err := winstats.GetPerformanceInfo()
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if err != nil {
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klog.ErrorS(err, "Eviction manager: error getting global memory status for node")
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}
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commmiLimitBytes := perfInfo.CommitLimitPages * perfInfo.PageSize
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capacity := resource.NewQuantity(int64(commmiLimitBytes), resource.BinarySI)
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evictionThresholdQuantity := evictionapi.GetThresholdQuantity(m.threshold.Value, capacity)
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commitTotalBytes := perfInfo.CommitTotalPages * perfInfo.PageSize
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commitAvailableBytes := commmiLimitBytes - commitTotalBytes
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if commitAvailableBytes <= uint64(evictionThresholdQuantity.Value()) {
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m.events <- struct{}{}
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}
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}
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func (m *windowsMemoryThresholdNotifier) UpdateThreshold(summary *statsapi.Summary) error {
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// Windows doesn't use cgroup notifiers to trigger eviction, so this function is a no-op.
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// Instead the go-routine set up in Start() will poll the system for memory usage and
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// trigger eviction when the threshold is crossed.
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return nil
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}
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func (m *windowsMemoryThresholdNotifier) Description() string {
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var hard, allocatable string
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if isHardEvictionThreshold(m.threshold) {
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hard = "hard"
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} else {
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hard = "soft"
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}
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if isAllocatableEvictionThreshold(m.threshold) {
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allocatable = "allocatable"
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}
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return fmt.Sprintf("%s %s memory eviction threshold", hard, allocatable)
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}
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