112 lines
2.3 KiB
Go
112 lines
2.3 KiB
Go
package cgroups
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import (
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"fmt"
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"io/ioutil"
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"path/filepath"
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"strconv"
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"strings"
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)
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const nanosecondsInSecond = 1000000000
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var clockTicks = getClockTicks()
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func NewCpuacct(root string) *cpuacctController {
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return &cpuacctController{
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root: filepath.Join(root, string(Cpuacct)),
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}
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}
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type cpuacctController struct {
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root string
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}
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func (c *cpuacctController) Name() Name {
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return Cpuacct
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}
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func (c *cpuacctController) Path(path string) string {
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return filepath.Join(c.root, path)
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}
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func (c *cpuacctController) Stat(path string, stats *Stats) error {
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user, kernel, err := c.getUsage(path)
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if err != nil {
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return err
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}
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total, err := readUint(filepath.Join(c.Path(path), "cpuacct.usage"))
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if err != nil {
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return err
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}
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percpu, err := c.percpuUsage(path)
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if err != nil {
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return err
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}
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stats.cpuMu.Lock()
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cpu := stats.Cpu
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if cpu == nil {
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cpu = &CpuStat{}
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stats.Cpu = cpu
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}
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stats.cpuMu.Unlock()
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cpu.Usage.Total = total
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cpu.Usage.User = user
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cpu.Usage.Kernel = kernel
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cpu.Usage.PerCpu = percpu
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return nil
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}
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func (c *cpuacctController) percpuUsage(path string) ([]uint64, error) {
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var usage []uint64
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data, err := ioutil.ReadFile(filepath.Join(c.Path(path), "cpuacct.usage_percpu"))
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if err != nil {
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return nil, err
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}
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for _, v := range strings.Fields(string(data)) {
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u, err := strconv.ParseUint(v, 10, 64)
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if err != nil {
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return nil, err
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}
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usage = append(usage, u)
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}
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return usage, nil
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}
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func (c *cpuacctController) getUsage(path string) (user uint64, kernel uint64, err error) {
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statPath := filepath.Join(c.Path(path), "cpuacct.stat")
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data, err := ioutil.ReadFile(statPath)
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if err != nil {
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return 0, 0, err
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}
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fields := strings.Fields(string(data))
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if len(fields) != 4 {
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return 0, 0, fmt.Errorf("%q is expected to have 4 fields", statPath)
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}
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for _, t := range []struct {
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index int
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name string
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value *uint64
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}{
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{
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index: 0,
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name: "user",
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value: &user,
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},
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{
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index: 2,
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name: "system",
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value: &kernel,
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},
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} {
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if fields[t.index] != t.name {
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return 0, 0, fmt.Errorf("expected field %q but found %q in %q", t.name, fields[t.index], statPath)
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}
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v, err := strconv.ParseUint(fields[t.index+1], 10, 64)
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if err != nil {
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return 0, 0, err
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}
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*t.value = v
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}
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return (user * nanosecondsInSecond) / clockTicks, (kernel * nanosecondsInSecond) / clockTicks, nil
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}
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