k3s/vendor/github.com/opencontainers/runc/libcontainer/cgroups/fs2/cpu.go

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// +build linux
package fs2
import (
"bufio"
"os"
"path/filepath"
"strconv"
"github.com/opencontainers/runc/libcontainer/cgroups"
"github.com/opencontainers/runc/libcontainer/cgroups/fscommon"
"github.com/opencontainers/runc/libcontainer/configs"
)
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func isCpuSet(cgroup *configs.Cgroup) bool {
return cgroup.Resources.CpuWeight != 0 || cgroup.Resources.CpuQuota != 0 || cgroup.Resources.CpuPeriod != 0
}
func setCpu(dirPath string, cgroup *configs.Cgroup) error {
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if !isCpuSet(cgroup) {
return nil
}
r := cgroup.Resources
// NOTE: .CpuShares is not used here. Conversion is the caller's responsibility.
if r.CpuWeight != 0 {
if err := fscommon.WriteFile(dirPath, "cpu.weight", strconv.FormatUint(r.CpuWeight, 10)); err != nil {
return err
}
}
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if r.CpuQuota != 0 || r.CpuPeriod != 0 {
str := "max"
if r.CpuQuota > 0 {
str = strconv.FormatInt(r.CpuQuota, 10)
}
period := r.CpuPeriod
if period == 0 {
// This default value is documented in
// https://www.kernel.org/doc/html/latest/admin-guide/cgroup-v2.html
period = 100000
}
str += " " + strconv.FormatUint(period, 10)
if err := fscommon.WriteFile(dirPath, "cpu.max", str); err != nil {
return err
}
}
return nil
}
func statCpu(dirPath string, stats *cgroups.Stats) error {
f, err := os.Open(filepath.Join(dirPath, "cpu.stat"))
if err != nil {
return err
}
defer f.Close()
sc := bufio.NewScanner(f)
for sc.Scan() {
t, v, err := fscommon.GetCgroupParamKeyValue(sc.Text())
if err != nil {
return err
}
switch t {
case "usage_usec":
stats.CpuStats.CpuUsage.TotalUsage = v * 1000
case "user_usec":
stats.CpuStats.CpuUsage.UsageInUsermode = v * 1000
case "system_usec":
stats.CpuStats.CpuUsage.UsageInKernelmode = v * 1000
}
}
return nil
}