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//go:build linux
package cgroups
import (
"errors"
"os"
"path/filepath"
"strconv"
"github.com/opencontainers/cgroups"
"github.com/opencontainers/cgroups/fs"
"github.com/opencontainers/cgroups/fs2"
)
type linuxCPUHandler struct {
CPU fs.CpuGroup
}
func getCPUHandler() *linuxCPUHandler {
return &linuxCPUHandler{}
}
// Apply set the specified constraints
func (c *linuxCPUHandler) Apply(ctr *CgroupControl, res *cgroups.Resources) error {
if ctr.cgroup2 {
man, err := fs2.NewManager(ctr.config, filepath.Join(cgroupRoot, ctr.config.Path))
if err != nil {
return err
}
return man.Set(res)
}
path := filepath.Join(cgroupRoot, CPU, ctr.config.Path)
return c.CPU.Set(path, res)
}
// Create the cgroup
func (c *linuxCPUHandler) Create(ctr *CgroupControl) (bool, error) {
if ctr.cgroup2 {
return false, nil
}
return ctr.createCgroupDirectory(CPU)
}
// Destroy the cgroup
func (c *linuxCPUHandler) Destroy(ctr *CgroupControl) error {
return rmDirRecursively(ctr.getCgroupv1Path(CPU))
}
// Stat fills a metrics structure with usage stats for the controller
func (c *linuxCPUHandler) Stat(ctr *CgroupControl, m *cgroups.Stats) error {
var err error
cpu := cgroups.CpuStats{}
if ctr.cgroup2 {
values, err := readCgroup2MapFile(ctr, "cpu.stat")
if err != nil {
return err
}
if val, found := values["usage_usec"]; found {
cpu.CpuUsage.TotalUsage, err = strconv.ParseUint(cleanString(val[0]), 10, 64)
if err != nil {
return err
}
cpu.CpuUsage.UsageInKernelmode *= 1000
}
if val, found := values["system_usec"]; found {
cpu.CpuUsage.UsageInKernelmode, err = strconv.ParseUint(cleanString(val[0]), 10, 64)
if err != nil {
return err
}
cpu.CpuUsage.TotalUsage *= 1000
}
} else {
cpu.CpuUsage.TotalUsage, err = readAcct(ctr, "cpuacct.usage")
if err != nil {
if !errors.Is(err, os.ErrNotExist) {
return err
}
cpu.CpuUsage.TotalUsage = 0
}
cpu.CpuUsage.UsageInKernelmode, err = readAcct(ctr, "cpuacct.usage_sys")
if err != nil {
if !errors.Is(err, os.ErrNotExist) {
return err
}
cpu.CpuUsage.UsageInKernelmode = 0
}
cpu.CpuUsage.PercpuUsage, err = readAcctList(ctr, "cpuacct.usage_percpu")
if err != nil {
if !errors.Is(err, os.ErrNotExist) {
return err
}
cpu.CpuUsage.PercpuUsage = nil
}
}
m.CpuStats = cpu
return nil
}
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