mirror of
https://github.com/k3s-io/kubernetes.git
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96 lines
3.4 KiB
Go
96 lines
3.4 KiB
Go
//go:build windows
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// +build windows
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/*
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Copyright 2018 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 app
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import (
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"fmt"
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"unsafe"
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"golang.org/x/sys/windows"
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"k8s.io/klog/v2"
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"k8s.io/kubernetes/pkg/windows/service"
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)
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const (
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serviceName = "kubelet"
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)
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// getPriorityValue returns the value associated with a Windows process priorityClass
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// Ref: https://docs.microsoft.com/en-us/windows/win32/cimwin32prov/setpriority-method-in-class-win32-process
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func getPriorityValue(priorityClassName string) uint32 {
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var priorityClassMap = map[string]uint32{
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"IDLE_PRIORITY_CLASS": uint32(windows.IDLE_PRIORITY_CLASS),
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"BELOW_NORMAL_PRIORITY_CLASS": uint32(windows.BELOW_NORMAL_PRIORITY_CLASS),
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"NORMAL_PRIORITY_CLASS": uint32(windows.NORMAL_PRIORITY_CLASS),
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"ABOVE_NORMAL_PRIORITY_CLASS": uint32(windows.ABOVE_NORMAL_PRIORITY_CLASS),
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"HIGH_PRIORITY_CLASS": uint32(windows.HIGH_PRIORITY_CLASS),
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"REALTIME_PRIORITY_CLASS": uint32(windows.REALTIME_PRIORITY_CLASS),
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}
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return priorityClassMap[priorityClassName]
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}
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// createWindowsJobObject creates a new Job Object
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// (https://docs.microsoft.com/en-us/windows/win32/procthread/job-objects),
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// and specifies the priority class for the job object to the specified value.
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// A job object is used here so that any spawned processes such as powershell or
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// wmic are created at the specified thread priority class.
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// Running kubelet with above normal / high priority can help improve
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// responsiveness on machines with high CPU utilization.
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func createWindowsJobObject(pc uint32) (windows.Handle, error) {
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job, err := windows.CreateJobObject(nil, nil)
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if err != nil {
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return windows.InvalidHandle, fmt.Errorf("windows.CreateJobObject failed: %w", err)
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}
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limitInfo := windows.JOBOBJECT_BASIC_LIMIT_INFORMATION{
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LimitFlags: windows.JOB_OBJECT_LIMIT_PRIORITY_CLASS,
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PriorityClass: pc,
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}
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if _, err := windows.SetInformationJobObject(
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job,
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windows.JobObjectBasicLimitInformation,
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uintptr(unsafe.Pointer(&limitInfo)),
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uint32(unsafe.Sizeof(limitInfo))); err != nil {
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return windows.InvalidHandle, fmt.Errorf("windows.SetInformationJobObject failed: %w", err)
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}
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return job, nil
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}
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func initForOS(windowsService bool, windowsPriorityClass string) error {
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priority := getPriorityValue(windowsPriorityClass)
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if priority == 0 {
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return fmt.Errorf("unknown priority class %s, valid ones are available at "+
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"https://docs.microsoft.com/en-us/windows/win32/procthread/scheduling-priorities", windowsPriorityClass)
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}
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klog.InfoS("Creating a Windows job object and adding kubelet process to it", "windowsPriorityClass", windowsPriorityClass)
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job, err := createWindowsJobObject(priority)
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if err != nil {
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return err
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}
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if err := windows.AssignProcessToJobObject(job, windows.CurrentProcess()); err != nil {
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return fmt.Errorf("windows.AssignProcessToJobObject failed: %w", err)
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}
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if windowsService {
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return service.InitService(serviceName)
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}
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return nil
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}
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