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https://github.com/k3s-io/kubernetes.git
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79 lines
2.1 KiB
Go
79 lines
2.1 KiB
Go
//go:build windows
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// +build windows
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/*
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Copyright 2021 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 main
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import (
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"flag"
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"syscall"
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"time"
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syswin "golang.org/x/sys/windows"
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)
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type procCPUStats struct {
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User int64 // nanoseconds spent in user mode
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System int64 // nanoseconds spent in system mode
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Time time.Time // when the sample was taken
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Total int64 // total of all time fields (nanoseconds)
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}
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// Retrieves the amount of CPU time this process has used since it started.
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func statsNow(handle syscall.Handle) (s procCPUStats) {
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var processInfo syscall.Rusage
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syscall.GetProcessTimes(handle, &processInfo.CreationTime, &processInfo.ExitTime, &processInfo.KernelTime, &processInfo.UserTime)
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s.Time = time.Now()
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s.User = processInfo.UserTime.Nanoseconds()
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s.System = processInfo.KernelTime.Nanoseconds()
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s.Total = s.User + s.System
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return s
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}
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// Given stats from two time points, calculates the millicores used by this
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// process between the two samples.
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func usageNow(first procCPUStats, second procCPUStats) int64 {
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dT := second.Time.Sub(first.Time).Nanoseconds()
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dUsage := (second.Total - first.Total)
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if dT == 0 {
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return 0
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}
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return 1000 * dUsage / dT
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}
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func main() {
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flag.Parse()
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phandle, err := syswin.GetCurrentProcess()
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if err != nil {
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panic(err)
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}
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handle := syscall.Handle(phandle)
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duration := time.Duration(*durationSec) * time.Second
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start := time.Now()
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first := statsNow(handle)
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for time.Since(start) < duration {
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currentMillicores := usageNow(first, statsNow(handle))
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if currentMillicores < int64(*millicores) {
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doSomething()
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} else {
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time.Sleep(sleep)
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}
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}
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}
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