125 lines
3 KiB
Go
125 lines
3 KiB
Go
// +build linux
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package fs
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import (
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"bufio"
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"os"
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"path/filepath"
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"strconv"
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"github.com/opencontainers/runc/libcontainer/cgroups"
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"github.com/opencontainers/runc/libcontainer/configs"
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)
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type CpuGroup struct {
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}
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func (s *CpuGroup) Name() string {
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return "cpu"
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}
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func (s *CpuGroup) Apply(d *cgroupData) error {
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// We always want to join the cpu group, to allow fair cpu scheduling
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// on a container basis
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path, err := d.path("cpu")
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if err != nil && !cgroups.IsNotFound(err) {
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return err
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}
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return s.ApplyDir(path, d.config, d.pid)
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}
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func (s *CpuGroup) ApplyDir(path string, cgroup *configs.Cgroup, pid int) error {
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// This might happen if we have no cpu cgroup mounted.
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// Just do nothing and don't fail.
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if path == "" {
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return nil
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}
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if err := os.MkdirAll(path, 0755); err != nil {
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return err
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}
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// We should set the real-Time group scheduling settings before moving
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// in the process because if the process is already in SCHED_RR mode
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// and no RT bandwidth is set, adding it will fail.
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if err := s.SetRtSched(path, cgroup); err != nil {
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return err
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}
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// because we are not using d.join we need to place the pid into the procs file
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// unlike the other subsystems
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if err := cgroups.WriteCgroupProc(path, pid); err != nil {
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return err
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}
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return nil
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}
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func (s *CpuGroup) SetRtSched(path string, cgroup *configs.Cgroup) error {
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if cgroup.Resources.CpuRtPeriod != 0 {
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if err := writeFile(path, "cpu.rt_period_us", strconv.FormatUint(cgroup.Resources.CpuRtPeriod, 10)); err != nil {
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return err
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}
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}
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if cgroup.Resources.CpuRtRuntime != 0 {
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if err := writeFile(path, "cpu.rt_runtime_us", strconv.FormatInt(cgroup.Resources.CpuRtRuntime, 10)); err != nil {
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return err
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}
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}
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return nil
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}
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func (s *CpuGroup) Set(path string, cgroup *configs.Cgroup) error {
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if cgroup.Resources.CpuShares != 0 {
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if err := writeFile(path, "cpu.shares", strconv.FormatUint(cgroup.Resources.CpuShares, 10)); err != nil {
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return err
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}
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}
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if cgroup.Resources.CpuPeriod != 0 {
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if err := writeFile(path, "cpu.cfs_period_us", strconv.FormatUint(cgroup.Resources.CpuPeriod, 10)); err != nil {
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return err
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}
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}
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if cgroup.Resources.CpuQuota != 0 {
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if err := writeFile(path, "cpu.cfs_quota_us", strconv.FormatInt(cgroup.Resources.CpuQuota, 10)); err != nil {
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return err
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}
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}
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if err := s.SetRtSched(path, cgroup); err != nil {
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return err
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}
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return nil
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}
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func (s *CpuGroup) Remove(d *cgroupData) error {
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return removePath(d.path("cpu"))
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}
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func (s *CpuGroup) GetStats(path string, stats *cgroups.Stats) error {
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f, err := os.Open(filepath.Join(path, "cpu.stat"))
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if err != nil {
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if os.IsNotExist(err) {
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return nil
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}
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return err
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}
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defer f.Close()
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sc := bufio.NewScanner(f)
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for sc.Scan() {
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t, v, err := getCgroupParamKeyValue(sc.Text())
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if err != nil {
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return err
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}
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switch t {
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case "nr_periods":
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stats.CpuStats.ThrottlingData.Periods = v
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case "nr_throttled":
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stats.CpuStats.ThrottlingData.ThrottledPeriods = v
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case "throttled_time":
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stats.CpuStats.ThrottlingData.ThrottledTime = v
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}
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}
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return nil
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}
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