func GetStats(c *cgroups.Cgroup) (*cgroups.Stats, error) {
stats := cgroups.NewStats()
d, err := getCgroupData(c, 0)
if err != nil {
return nil, fmt.Errorf("getting CgroupData %s", err)
}
for sysname, sys := range subsystems {
path, err := d.path(sysname)
if err != nil {
// Don't fail if a cgroup hierarchy was not found, just skip this subsystem
if cgroups.IsNotFound(err) {
continue
}
return nil, err
}
if err := sys.GetStats(path, stats); err != nil {
return nil, err
}
}
return stats, nil
}
func (s *PerfEventGroup) Set(d *data) error {
// we just want to join this group even though we don't set anything
if _, err := d.join("perf_event"); err != nil && !cgroups.IsNotFound(err) {
return err
}
return nil
}
func (s *FreezerGroup) Set(d *data) error {
switch d.c.Freezer {
case cgroups.Frozen, cgroups.Thawed:
dir, err := d.path("freezer")
if err != nil {
return err
}
if err := writeFile(dir, "freezer.state", string(d.c.Freezer)); err != nil {
return err
}
for {
state, err := readFile(dir, "freezer.state")
if err != nil {
return err
}
if strings.TrimSpace(state) == string(d.c.Freezer) {
break
}
time.Sleep(1 * time.Millisecond)
}
default:
if _, err := d.join("freezer"); err != nil && !cgroups.IsNotFound(err) {
return err
}
}
return nil
}
func (raw *data) Paths() (map[string]string, error) {
paths := make(map[string]string)
for sysname := range subsystems {
path, err := raw.path(sysname)
if err != nil {
// Don't fail if a cgroup hierarchy was not found, just skip this subsystem
if cgroups.IsNotFound(err) {
continue
}
return nil, err
}
paths[sysname] = path
}
return paths, nil
}
/*
* This would be nicer to get from the systemd API when accounting
* is enabled, but sadly there is no way to do that yet.
* The lack of this functionality in the API & the approach taken
* is guided by
* http://www.freedesktop.org/wiki/Software/systemd/ControlGroupInterface/#readingaccountinginformation.
*/
func GetStats(c *cgroups.Cgroup) (*cgroups.Stats, error) {
stats := cgroups.NewStats()
for sysname, sys := range subsystems {
subsystemPath, err := getSubsystemPath(c, sysname)
if err != nil {
// Don't fail if a cgroup hierarchy was not found, just skip this subsystem
if cgroups.IsNotFound(err) {
continue
}
return nil, err
}
if err := sys.GetStats(subsystemPath, stats); err != nil {
return nil, err
}
}
return stats, nil
}