/
cpu.go
65 lines (58 loc) · 1.95 KB
/
cpu.go
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/*
* Copyright (c) 2021 THL A29 Limited, a Tencent company.
*
* 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.
*/
package cgroup
import (
"fmt"
"path"
"strconv"
"github.com/opencontainers/runc/libcontainer/cgroups"
"github.com/opencontainers/runc/libcontainer/cgroups/fs"
)
const (
CPUSubsystem = "cpu"
)
// GetCPUTotalUsage get cpu usage for cgroup
func GetCPUTotalUsage(pathInCgroup string) (uint64, error) {
root := GetRoot()
cgPath := path.Join(root, CPUSubsystem, pathInCgroup)
g := new(fs.CpuacctGroup)
stats := cgroups.NewStats()
if err := g.GetStats(cgPath, stats); err != nil {
return 0, fmt.Errorf("get cpuacct cgroup stats failed: %v", err)
}
return stats.CpuStats.CpuUsage.TotalUsage, nil
}
// SetCPUShares set cpu.shares for cgroup
func SetCPUShares(pathInCgroup string, value uint64) error {
root := GetRoot()
return WriteFile([]byte(strconv.FormatUint(value, 10)),
path.Join(root, CPUSubsystem, pathInCgroup), "cpu.shares")
}
// SetCpuQuota set cpu.cfs_quota_us for cgroup
func SetCpuQuota(pathInCgroup string, cores float64) error {
root := GetRoot()
// changing default value 100000 to 1000000 for cpu.cfs_period_us
err := WriteFile([]byte("1000000"),
path.Join(root, CPUSubsystem, pathInCgroup), "cpu.cfs_period_us")
if err != nil {
return err
}
value := int64(cores * 1000000)
if cores == -1 {
value = -1
}
return WriteFile([]byte(strconv.FormatInt(value, 10)),
path.Join(root, CPUSubsystem, pathInCgroup), "cpu.cfs_quota_us")
}