101 lines
2.8 KiB
Go
101 lines
2.8 KiB
Go
// Copyright 2022 PingCAP, Inc.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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//go:build linux
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package cgroup
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import (
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"fmt"
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"regexp"
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"runtime"
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"strconv"
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"sync"
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"syscall"
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"testing"
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"github.com/stretchr/testify/require"
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)
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func checkKernelVersionNewerThan(t *testing.T, major, minor int) bool {
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u := syscall.Utsname{}
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err := syscall.Uname(&u)
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require.NoError(t, err)
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releaseBs := make([]byte, 0, len(u.Release))
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for _, v := range u.Release {
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if v == 0 {
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break
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}
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releaseBs = append(releaseBs, byte(v))
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}
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releaseStr := string(releaseBs)
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t.Log("kernel release string:", releaseStr)
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versionInfoRE := regexp.MustCompile(`[0-9]+\.[0-9]+\.[0-9]+`)
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kernelVerion := versionInfoRE.FindAllString(releaseStr, 1)
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require.Equal(t, 1, len(kernelVerion), fmt.Sprintf("release str is %s", releaseStr))
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kernelVersionPartRE := regexp.MustCompile(`[0-9]+`)
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kernelVersionParts := kernelVersionPartRE.FindAllString(kernelVerion[0], -1)
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require.Equal(t, 3, len(kernelVersionParts), fmt.Sprintf("kernel verion str is %s", kernelVerion[0]))
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t.Logf("parsed kernel version parts: major %s, minor %s, patch %s",
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kernelVersionParts[0], kernelVersionParts[1], kernelVersionParts[2])
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mustConvInt := func(s string) int {
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i, err := strconv.Atoi(s)
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require.NoError(t, err, s)
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return i
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}
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versionNewerThanFlag := false
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if mustConvInt(kernelVersionParts[0]) > major {
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versionNewerThanFlag = true
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} else {
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if mustConvInt(kernelVersionParts[0]) == major && mustConvInt(kernelVersionParts[1]) > minor {
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versionNewerThanFlag = true
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}
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}
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return versionNewerThanFlag
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}
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func TestGetCgroupCPU(t *testing.T) {
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exit := make(chan struct{})
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var wg sync.WaitGroup
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for i := 0; i < 10; i++ {
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wg.Add(1)
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go func() {
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defer wg.Done()
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for {
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select {
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case <-exit:
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return
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default:
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runtime.Gosched()
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}
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}
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}()
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}
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cpu, err := GetCgroupCPU()
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if err == errNoCPUControllerDetected {
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// for more information, please refer https://github.com/pingcap/tidb/pull/41347
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if checkKernelVersionNewerThan(t, 4, 7) {
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require.NoError(t, err, "linux version > v4.7 and err still happens")
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} else {
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t.Logf("the error '%s' is ignored because the kernel is too old", err)
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}
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} else {
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require.NoError(t, err)
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require.NotZero(t, cpu.Period)
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require.Less(t, int64(1), cpu.Period)
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}
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close(exit)
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wg.Wait()
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}
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