diff options
| author | Sridhar Samudrala <samudrala.sridhar@gmail.com> | 2010-05-30 22:24:39 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2010-07-28 15:45:12 +0300 |
| commit | d7926ee38f5c6e0bbebe712304f99a4c67e40f84 (patch) | |
| tree | 2feae78726dae032741f81fc9590d61693a182f5 | |
| parent | c23f3445e68e1db0e74099f264bc5ff5d55ebdeb (diff) | |
cgroups: Add an API to attach a task to current task's cgroup
Add a new kernel API to attach a task to current task's cgroup
in all the active hierarchies.
Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Paul Menage <menage@google.com>
Acked-by: Li Zefan <lizf@cn.fujitsu.com>
| -rw-r--r-- | include/linux/cgroup.h | 7 | ||||
| -rw-r--r-- | kernel/cgroup.c | 23 |
2 files changed, 30 insertions, 0 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index 0c621604baa..e0aa067d1b1 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -570,6 +570,7 @@ struct task_struct *cgroup_iter_next(struct cgroup *cgrp, void cgroup_iter_end(struct cgroup *cgrp, struct cgroup_iter *it); int cgroup_scan_tasks(struct cgroup_scanner *scan); int cgroup_attach_task(struct cgroup *, struct task_struct *); +int cgroup_attach_task_current_cg(struct task_struct *); /* * CSS ID is ID for cgroup_subsys_state structs under subsys. This only works @@ -626,6 +627,12 @@ static inline int cgroupstats_build(struct cgroupstats *stats, return -EINVAL; } +/* No cgroups - nothing to do */ +static inline int cgroup_attach_task_current_cg(struct task_struct *t) +{ + return 0; +} + #endif /* !CONFIG_CGROUPS */ #endif /* _LINUX_CGROUP_H */ diff --git a/kernel/cgroup.c b/kernel/cgroup.c index 422cb19f156..37642ad9cca 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -1788,6 +1788,29 @@ out: return retval; } +/** + * cgroup_attach_task_current_cg - attach task 'tsk' to current task's cgroup + * @tsk: the task to be attached + */ +int cgroup_attach_task_current_cg(struct task_struct *tsk) +{ + struct cgroupfs_root *root; + struct cgroup *cur_cg; + int retval = 0; + + cgroup_lock(); + for_each_active_root(root) { + cur_cg = task_cgroup_from_root(current, root); + retval = cgroup_attach_task(cur_cg, tsk); + if (retval) + break; + } + cgroup_unlock(); + + return retval; +} +EXPORT_SYMBOL_GPL(cgroup_attach_task_current_cg); + /* * Attach task with pid 'pid' to cgroup 'cgrp'. Call with cgroup_mutex * held. May take task_lock of task |