79 lines
2.1 KiB
Go
79 lines
2.1 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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package cgroup
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import (
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"fmt"
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"path/filepath"
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"github.com/pingcap/errors"
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)
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// Helper function for getCgroupCPU. Root is always "/", except in tests.
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func getCgroupCPU(root string) (CPUUsage, error) {
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path, err := detectControlPath(filepath.Join(root, procPathCGroup), "cpu,cpuacct")
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if err != nil {
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return CPUUsage{}, err
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}
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// No CPU controller detected
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if path == "" {
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return CPUUsage{}, errors.New("no cpu controller detected")
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}
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mount, ver, err := getCgroupDetails(filepath.Join(root, procPathMountInfo), path, "cpu,cpuacct")
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if err != nil {
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return CPUUsage{}, err
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}
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var res CPUUsage
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switch ver {
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case 1:
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cgroupRoot := filepath.Join(root, mount)
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res.Period, res.Quota, err = detectCPUQuotaInV1(cgroupRoot)
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if err != nil {
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return res, err
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}
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res.Stime, res.Utime, err = detectCPUUsageInV1(cgroupRoot)
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if err != nil {
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return res, err
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}
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case 2:
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cgroupRoot := filepath.Join(root, mount, path)
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res.Period, res.Quota, err = detectCPUQuotaInV2(cgroupRoot)
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if err != nil {
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return res, err
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}
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res.Stime, res.Utime, err = detectCPUUsageInV2(cgroupRoot)
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if err != nil {
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return res, err
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}
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default:
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return CPUUsage{}, fmt.Errorf("detected unknown cgroup version index: %d", ver)
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}
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return res, nil
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}
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// CPUShares returns the number of CPUs this cgroup can be expected to
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// max out. If there's no limit, NumCPU is returned.
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func (c CPUUsage) CPUShares() float64 {
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if c.Period <= 0 || c.Quota <= 0 {
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return float64(c.NumCPU)
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}
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return float64(c.Quota) / float64(c.Period)
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}
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