139 lines
3.4 KiB
Go
139 lines
3.4 KiB
Go
// +build linux
|
|
|
|
package fs
|
|
|
|
import (
|
|
"bytes"
|
|
"io/ioutil"
|
|
"os"
|
|
"path/filepath"
|
|
"strconv"
|
|
|
|
"github.com/opencontainers/runc/libcontainer/cgroups"
|
|
"github.com/opencontainers/runc/libcontainer/configs"
|
|
)
|
|
|
|
type CpusetGroup struct {
|
|
}
|
|
|
|
func (s *CpusetGroup) Name() string {
|
|
return "cpuset"
|
|
}
|
|
|
|
func (s *CpusetGroup) Apply(d *cgroupData) error {
|
|
dir, err := d.path("cpuset")
|
|
if err != nil && !cgroups.IsNotFound(err) {
|
|
return err
|
|
}
|
|
return s.ApplyDir(dir, d.config, d.pid)
|
|
}
|
|
|
|
func (s *CpusetGroup) Set(path string, cgroup *configs.Cgroup) error {
|
|
if cgroup.Resources.CpusetCpus != "" {
|
|
if err := writeFile(path, "cpuset.cpus", cgroup.Resources.CpusetCpus); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
if cgroup.Resources.CpusetMems != "" {
|
|
if err := writeFile(path, "cpuset.mems", cgroup.Resources.CpusetMems); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (s *CpusetGroup) Remove(d *cgroupData) error {
|
|
return removePath(d.path("cpuset"))
|
|
}
|
|
|
|
func (s *CpusetGroup) GetStats(path string, stats *cgroups.Stats) error {
|
|
return nil
|
|
}
|
|
|
|
func (s *CpusetGroup) ApplyDir(dir string, cgroup *configs.Cgroup, pid int) error {
|
|
// This might happen if we have no cpuset cgroup mounted.
|
|
// Just do nothing and don't fail.
|
|
if dir == "" {
|
|
return nil
|
|
}
|
|
root, err := getCgroupRoot()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if err := s.ensureParent(dir, root); err != nil {
|
|
return err
|
|
}
|
|
// the default values inherit from parent cgroup are already set in
|
|
// s.ensureParent, cover these if we have our own
|
|
if err := s.Set(dir, cgroup); err != nil {
|
|
return err
|
|
}
|
|
// because we are not using d.join we need to place the pid into the procs file
|
|
// unlike the other subsystems
|
|
if err := writeFile(dir, "cgroup.procs", strconv.Itoa(pid)); err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (s *CpusetGroup) getSubsystemSettings(parent string) (cpus []byte, mems []byte, err error) {
|
|
if cpus, err = ioutil.ReadFile(filepath.Join(parent, "cpuset.cpus")); err != nil {
|
|
return
|
|
}
|
|
if mems, err = ioutil.ReadFile(filepath.Join(parent, "cpuset.mems")); err != nil {
|
|
return
|
|
}
|
|
return cpus, mems, nil
|
|
}
|
|
|
|
// ensureParent makes sure that the parent directory of current is created
|
|
// and populated with the proper cpus and mems files copied from
|
|
// it's parent.
|
|
func (s *CpusetGroup) ensureParent(current, root string) error {
|
|
parent := filepath.Dir(current)
|
|
if filepath.Clean(parent) == root {
|
|
return nil
|
|
}
|
|
if err := s.ensureParent(parent, root); err != nil {
|
|
return err
|
|
}
|
|
if err := os.MkdirAll(current, 0755); err != nil {
|
|
return err
|
|
}
|
|
return s.copyIfNeeded(current, parent)
|
|
}
|
|
|
|
// copyIfNeeded copies the cpuset.cpus and cpuset.mems from the parent
|
|
// directory to the current directory if the file's contents are 0
|
|
func (s *CpusetGroup) copyIfNeeded(current, parent string) error {
|
|
var (
|
|
err error
|
|
currentCpus, currentMems []byte
|
|
parentCpus, parentMems []byte
|
|
)
|
|
|
|
if currentCpus, currentMems, err = s.getSubsystemSettings(current); err != nil {
|
|
return err
|
|
}
|
|
if parentCpus, parentMems, err = s.getSubsystemSettings(parent); err != nil {
|
|
return err
|
|
}
|
|
|
|
if s.isEmpty(currentCpus) {
|
|
if err := writeFile(current, "cpuset.cpus", string(parentCpus)); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
if s.isEmpty(currentMems) {
|
|
if err := writeFile(current, "cpuset.mems", string(parentMems)); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (s *CpusetGroup) isEmpty(b []byte) bool {
|
|
return len(bytes.Trim(b, "\n")) == 0
|
|
}
|