mirror of
https://github.com/criyle/go-sandbox.git
synced 2025-11-04 14:49:53 +08:00
186 lines
4.2 KiB
Go
186 lines
4.2 KiB
Go
package cgroup
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"strings"
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)
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// Cgroup is the combination of sub-cgroups
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type Cgroup struct {
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prefix string
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cpuset *SubCgroup
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cpuacct *SubCgroup
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memory *SubCgroup
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pids *SubCgroup
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}
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// Build creates new cgrouup directories
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func (b *Builder) Build() (cg *Cgroup, err error) {
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var (
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cpuSetPath, cpuacctPath, memoryPath, pidsPath string
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)
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// if failed, remove potential created directory
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defer func() {
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if err != nil {
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remove(cpuSetPath)
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remove(cpuacctPath)
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remove(memoryPath)
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remove(pidsPath)
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}
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}()
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for _, c := range []struct {
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enable bool
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name string
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path *string
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}{
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{b.CPUSet, "cpuset", &cpuSetPath},
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{b.CPUAcct, "cpuacct", &cpuacctPath},
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{b.Memory, "memory", &memoryPath},
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{b.Pids, "pids", &pidsPath},
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} {
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if !c.enable {
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continue
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}
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if *c.path, err = CreateSubCgroupPath(c.name, b.Prefix); err != nil {
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return
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}
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}
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if b.CPUSet {
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if err = initCpuset(cpuSetPath); err != nil {
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return
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}
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}
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return &Cgroup{
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prefix: b.Prefix,
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cpuset: NewSubCgroup(cpuSetPath),
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cpuacct: NewSubCgroup(cpuacctPath),
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memory: NewSubCgroup(memoryPath),
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pids: NewSubCgroup(pidsPath),
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}, nil
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}
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// AddProc writes cgroup.procs to all sub-cgroup
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func (c *Cgroup) AddProc(pid int) error {
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for _, s := range []*SubCgroup{c.cpuset, c.cpuset, c.memory, c.pids} {
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if err := s.WriteUint(cgroupProcs, uint64(pid)); 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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// Destroy removes dir for sub-cgroup, errors are ignored if remove one failed
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func (c *Cgroup) Destroy() error {
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var err1 error
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for _, s := range []*SubCgroup{c.cpuset, c.cpuset, c.memory, c.pids} {
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if err := remove(s.path); err != nil {
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err1 = err
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}
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}
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return err1
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}
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// SetCpusetCpus set cpuset.cpus
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func (c *Cgroup) SetCpusetCpus(b []byte) error {
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return c.cpuset.WriteFile("cpuset.cpus", b)
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}
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// SetCpusetMems set cpuset.mems
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func (c *Cgroup) SetCpusetMems(b []byte) error {
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return c.cpuset.WriteFile("cpuset.mems", b)
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}
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// CpuacctUsage read cpuacct.usage in ns
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func (c *Cgroup) CpuacctUsage() (uint64, error) {
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return c.cpuacct.ReadUint("cpuacct.usage")
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}
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// MemoryMaxUsageInBytes read memory.max_usage_in_bytes
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func (c *Cgroup) MemoryMaxUsageInBytes() (uint64, error) {
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return c.memory.ReadUint("memory.max_usage_in_bytes")
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}
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// SetMemoryLimitInBytes write memory.limit_in_bytes
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func (c *Cgroup) SetMemoryLimitInBytes(i uint64) error {
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return c.memory.WriteUint("memory.limit_in_bytes", i)
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}
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// SetPidsMax write pids.max
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func (c *Cgroup) SetPidsMax(i uint64) error {
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return c.pids.WriteUint("pids.max", i)
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}
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// SetCpuacctUsage write cpuacct.usage in ns
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func (c *Cgroup) SetCpuacctUsage(i uint64) error {
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return c.cpuacct.WriteUint("cpuacct.usage", i)
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}
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// SetMemoryMaxUsageInBytes write cpuacct.usage in ns
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func (c *Cgroup) SetMemoryMaxUsageInBytes(i uint64) error {
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return c.memory.WriteUint("memory.max_usage_in_bytes", i)
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}
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// FindMemoryStatProperty find certain property from memory.stat
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func (c *Cgroup) FindMemoryStatProperty(prop string) (uint64, error) {
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content, err := c.memory.ReadFile("memory.stat")
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if err != nil {
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return 0, err
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}
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r := bytes.NewReader(content)
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for {
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var p string
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var i uint64
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_, err = fmt.Fscanln(r, &p, &i)
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if err != nil {
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return 0, err
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}
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if p == prop {
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return i, nil
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}
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}
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}
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// initCpuset will copy the config from the parent cpu sets if not exists
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func initCpuset(path string) error {
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for _, f := range []string{"cpuset.cpus", "cpuset.mems"} {
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if err := copyCgroupPropertyFromParent(path, f); 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 copyCgroupPropertyFromParent(path, name string) error {
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// ensure current one empty
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b, err := ioutil.ReadFile(filepath.Join(path, name))
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if err != nil {
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return err
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}
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if len(strings.TrimSpace(string(b))) > 0 {
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return nil
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}
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// otherwise copy from parent, first to ensure it is empty by recurssion
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if err := copyCgroupPropertyFromParent(filepath.Dir(path), name); err != nil {
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return err
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}
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b, err = ioutil.ReadFile(filepath.Join(filepath.Dir(path), name))
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if err != nil {
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return err
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}
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return ioutil.WriteFile(filepath.Join(path, name), b, filePerm)
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}
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func remove(name string) error {
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if name != "" {
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return os.Remove(name)
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}
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return nil
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}
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