mirror of https://github.com/containers/podman.git
86 lines
2.1 KiB
Go
86 lines
2.1 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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"strings"
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spec "github.com/opencontainers/runtime-spec/specs-go"
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"github.com/pkg/errors"
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)
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type cpusetHandler struct {
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}
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func cpusetCopyFileFromParent(dir, file string, cgroupv2 bool) ([]byte, error) {
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if dir == cgroupRoot {
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return nil, fmt.Errorf("could not find parent to initialize cpuset %s", file)
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}
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path := filepath.Join(dir, file)
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parentPath := path
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if cgroupv2 {
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parentPath = fmt.Sprintf("%s.effective", parentPath)
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}
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data, err := ioutil.ReadFile(parentPath)
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if err != nil {
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return nil, errors.Wrapf(err, "open %s", path)
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}
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if len(strings.Trim(string(data), "\n")) != 0 {
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return data, nil
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}
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data, err = cpusetCopyFileFromParent(filepath.Dir(dir), file, cgroupv2)
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if err != nil {
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return nil, err
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}
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if err := ioutil.WriteFile(path, data, 0644); err != nil {
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return nil, errors.Wrapf(err, "write %s", path)
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}
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return data, nil
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}
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func cpusetCopyFromParent(path string, cgroupv2 bool) error {
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for _, file := range []string{"cpuset.cpus", "cpuset.mems"} {
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if _, err := cpusetCopyFileFromParent(path, file, cgroupv2); 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 getCpusetHandler() *cpusetHandler {
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return &cpusetHandler{}
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}
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// Apply set the specified constraints
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func (c *cpusetHandler) Apply(ctr *CgroupControl, res *spec.LinuxResources) error {
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if res.CPU == nil {
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return nil
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}
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return fmt.Errorf("cpuset apply not implemented yet")
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}
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// Create the cgroup
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func (c *cpusetHandler) Create(ctr *CgroupControl) (bool, error) {
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if ctr.cgroup2 {
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path := filepath.Join(cgroupRoot, ctr.path)
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return true, cpusetCopyFromParent(path, true)
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}
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created, err := ctr.createCgroupDirectory(CPUset)
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if !created || err != nil {
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return created, err
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}
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return true, cpusetCopyFromParent(ctr.getCgroupv1Path(CPUset), false)
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}
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// Destroy the cgroup
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func (c *cpusetHandler) Destroy(ctr *CgroupControl) error {
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return rmDirRecursively(ctr.getCgroupv1Path(CPUset))
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}
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// Stat fills a metrics structure with usage stats for the controller
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func (c *cpusetHandler) Stat(ctr *CgroupControl, m *Metrics) error {
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return nil
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}
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