60 lines
1.6 KiB
Go
60 lines
1.6 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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"math"
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"os"
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"runtime"
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"strings"
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)
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// GetCgroupCPU returns the CPU usage and quota for the current cgroup.
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func GetCgroupCPU() (CPUUsage, error) {
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cpuusage, err := getCgroupCPU("/")
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cpuusage.NumCPU = runtime.NumCPU()
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return cpuusage, err
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}
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// CPUQuotaToGOMAXPROCS converts the CPU quota applied to the calling process
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// to a valid GOMAXPROCS value.
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func CPUQuotaToGOMAXPROCS(minValue int) (int, CPUQuotaStatus, error) {
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quota, err := GetCgroupCPU()
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if err != nil {
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return -1, CPUQuotaUndefined, err
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}
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maxProcs := int(math.Ceil(quota.CPUShares()))
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if minValue > 0 && maxProcs < minValue {
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return minValue, CPUQuotaMinUsed, nil
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}
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return maxProcs, CPUQuotaUsed, nil
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}
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// InContainer returns true if the process is running in a container.
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func InContainer() bool {
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v, err := os.ReadFile(procPathCGroup)
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if err != nil {
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return false
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}
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if strings.Contains(string(v), "docker") ||
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strings.Contains(string(v), "kubepods") ||
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strings.Contains(string(v), "containerd") {
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return true
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}
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return false
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}
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