mirror of
https://github.com/criyle/go-sandbox.git
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108 lines
2.5 KiB
Go
108 lines
2.5 KiB
Go
package cgroup
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import (
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"bufio"
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"bytes"
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"os"
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"path"
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"strconv"
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"strings"
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)
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type CgroupV2 struct {
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path string
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}
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var _ Cgroup = &CgroupV2{}
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func (c *CgroupV2) AddProc(pid int) error {
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return c.WriteUint(cgroupProcs, uint64(pid))
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}
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func (c *CgroupV2) Destroy() error {
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return remove(c.path)
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}
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// CPUUsage reads cpu.stat usage_usec
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func (c *CgroupV2) CPUUsage() (uint64, error) {
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b, err := c.ReadFile("cpu.stat")
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if err != nil {
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return 0, err
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}
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s := bufio.NewScanner(bytes.NewReader(b))
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for s.Scan() {
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parts := strings.Fields(s.Text())
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if len(parts) == 2 && parts[0] == "usage_usec" {
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v, err := strconv.Atoi(parts[1])
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if err != nil {
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return 0, err
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}
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return uint64(v) * 1000, nil // to ns
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}
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}
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return 0, os.ErrNotExist
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}
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// MemoryUsage reads memory.current
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func (c *CgroupV2) MemoryUsage() (uint64, error) {
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return c.ReadUint("memory.current")
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}
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// MemoryMaxUsage not exist, use rusage.max_rss instead
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func (c *CgroupV2) MemoryMaxUsage() (uint64, error) {
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return 0, os.ErrNotExist
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}
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// SetCPUBandwidth set cpu.max quota period
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func (c *CgroupV2) SetCPUBandwidth(quota, period uint64) error {
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content := strconv.FormatUint(quota, 10) + " " + strconv.FormatUint(period, 10)
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return c.WriteFile("cpu.max", []byte(content))
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}
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// SetCPUSet sets cpuset.cpus
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func (c *CgroupV2) SetCPUSet(content []byte) error {
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return c.WriteFile("cpuset.cpus", content)
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}
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// SetMemoryLimit memory.max
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func (c *CgroupV2) SetMemoryLimit(l uint64) error {
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return c.WriteUint("memory.max", l)
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}
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// SetProcLimit pids.max
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func (c *CgroupV2) SetProcLimit(l uint64) error {
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return c.WriteUint("pids.max", l)
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}
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// WriteUint writes uint64 into given file
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func (c *CgroupV2) WriteUint(filename string, i uint64) error {
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return c.WriteFile(filename, []byte(strconv.FormatUint(i, 10)))
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}
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// ReadUint read uint64 from given file
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func (c *CgroupV2) ReadUint(filename string) (uint64, error) {
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b, err := c.ReadFile(filename)
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if err != nil {
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return 0, err
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}
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s, err := strconv.ParseUint(strings.TrimSpace(string(b)), 10, 64)
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if err != nil {
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return 0, err
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}
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return s, nil
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}
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// WriteFile writes cgroup file and handles potential EINTR error while writes to
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// the slow device (cgroup)
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func (c *CgroupV2) WriteFile(name string, content []byte) error {
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p := path.Join(c.path, name)
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return writeFile(p, content, filePerm)
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}
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// ReadFile reads cgroup file and handles potential EINTR error while read to
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// the slow device (cgroup)
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func (c *CgroupV2) ReadFile(name string) ([]byte, error) {
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p := path.Join(c.path, name)
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return readFile(p)
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}
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