101 lines
2.9 KiB
Go
101 lines
2.9 KiB
Go
// Copyright 2022 PingCAP, Inc.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
//go:build linux
|
|
|
|
package cgroup
|
|
|
|
import (
|
|
"math"
|
|
"os"
|
|
"runtime"
|
|
"strings"
|
|
|
|
"github.com/pingcap/errors"
|
|
"github.com/pingcap/failpoint"
|
|
)
|
|
|
|
// GetCgroupCPU returns the CPU usage and quota for the current cgroup.
|
|
func GetCgroupCPU() (CPUUsage, error) {
|
|
failpoint.Inject("GetCgroupCPUErr", func(val failpoint.Value) {
|
|
//nolint:forcetypeassert
|
|
if val.(bool) {
|
|
var cpuUsage CPUUsage
|
|
failpoint.Return(cpuUsage, errors.Errorf("mockAddBatchDDLJobsErr"))
|
|
}
|
|
})
|
|
cpuusage, err := getCgroupCPU("/")
|
|
|
|
cpuusage.NumCPU = runtime.NumCPU()
|
|
return cpuusage, err
|
|
}
|
|
|
|
// CPUQuotaToGOMAXPROCS converts the CPU quota applied to the calling process
|
|
// to a valid GOMAXPROCS value.
|
|
func CPUQuotaToGOMAXPROCS(minValue int) (int, CPUQuotaStatus, error) {
|
|
quota, err := GetCgroupCPU()
|
|
if err != nil {
|
|
return -1, CPUQuotaUndefined, err
|
|
}
|
|
maxProcs := int(math.Ceil(quota.CPUShares()))
|
|
if minValue > 0 && maxProcs < minValue {
|
|
return minValue, CPUQuotaMinUsed, nil
|
|
}
|
|
return maxProcs, CPUQuotaUsed, nil
|
|
}
|
|
|
|
// GetCPUPeriodAndQuota returns CPU period and quota time of cgroup.
|
|
func GetCPUPeriodAndQuota() (period int64, quota int64, err error) {
|
|
return getCgroupCPUPeriodAndQuota("/")
|
|
}
|
|
|
|
// InContainer returns true if the process is running in a container.
|
|
func InContainer() bool {
|
|
// for cgroup V1, check /proc/self/cgroup, for V2, check /proc/self/mountinfo
|
|
return inContainer(procPathCGroup) || inContainer(procPathMountInfo)
|
|
}
|
|
|
|
func inContainer(path string) bool {
|
|
v, err := os.ReadFile(path)
|
|
if err != nil {
|
|
return false
|
|
}
|
|
|
|
// For cgroup V1, check /proc/self/cgroup
|
|
if path == procPathCGroup {
|
|
if strings.Contains(string(v), "docker") ||
|
|
strings.Contains(string(v), "kubepods") ||
|
|
strings.Contains(string(v), "containerd") {
|
|
return true
|
|
}
|
|
}
|
|
|
|
// For cgroup V2, check /proc/self/mountinfo
|
|
if path == procPathMountInfo {
|
|
lines := strings.Split(string(v), "\n")
|
|
for _, line := range lines {
|
|
v := strings.Split(line, " ")
|
|
// check mount point of root dir is on overlay or not.
|
|
// v[4] means `mount point`, v[8] means `filesystem type`.
|
|
// see details from https://man7.org/linux/man-pages/man5/proc.5.html
|
|
// TODO: enhance this check, as overlay is not the only storage driver for container.
|
|
if len(v) > 8 && v[4] == "/" && v[8] == "overlay" {
|
|
return true
|
|
}
|
|
}
|
|
}
|
|
|
|
return false
|
|
}
|