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package fs
import (
"bufio"
"os"
"path/filepath"
"strconv"
"github.com/docker/libcontainer/cgroups"
)
type CpuGroup struct {
}
func (s *CpuGroup) Set(d *data) error {
// We always want to join the cpu group, to allow fair cpu scheduling
// on a container basis
dir, err := d.join("cpu")
if err != nil {
return err
}
if d.c.CpuShares != 0 {
if err := writeFile(dir, "cpu.shares", strconv.FormatInt(d.c.CpuShares, 10)); err != nil {
return err
}
}
if d.c.CpuPeriod != 0 {
if err := writeFile(dir, "cpu.cfs_period_us", strconv.FormatInt(d.c.CpuPeriod, 10)); err != nil {
return err
}
}
if d.c.CpuQuota != 0 {
if err := writeFile(dir, "cpu.cfs_quota_us", strconv.FormatInt(d.c.CpuQuota, 10)); err != nil {
return err
}
}
return nil
}
func (s *CpuGroup) Remove(d *data) error {
return removePath(d.path("cpu"))
}
func (s *CpuGroup) GetStats(path string, stats *cgroups.Stats) error {
f, err := os.Open(filepath.Join(path, "cpu.stat"))
if err != nil {
if os.IsNotExist(err) {
return nil
}
return err
}
defer f.Close()
sc := bufio.NewScanner(f)
for sc.Scan() {
t, v, err := getCgroupParamKeyValue(sc.Text())
if err != nil {
return err
}
switch t {
case "nr_periods":
stats.CpuStats.ThrottlingData.Periods = v
case "nr_throttled":
stats.CpuStats.ThrottlingData.ThrottledPeriods = v
case "throttled_time":
stats.CpuStats.ThrottlingData.ThrottledTime = v
}
}
return nil
}
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