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cgroup: document how cgroup IDs are assigned

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As cgroup id has been used in netprio cgroup and will be used in memcg,
it's important to make it clear how a cgroup id is allocated.

For example, in netprio cgroup, the id is used as index of anarray.

Signed-off-by: Li Zefan <lizefan@huwei.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Li Zefan 2013-07-31 09:51:06 +08:00 committed by Tejun Heo
parent 4e96ee8e98
commit b414dc09a3
1 changed files with 7 additions and 1 deletions
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8
include/linux/cgroup.h
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@ -161,7 +161,13 @@ struct cgroup_name {
struct cgroup {
unsigned long flags; /* "unsigned long" so bitops work */
int id; /* idr allocated in-hierarchy ID */
/*
* idr allocated in-hierarchy ID.
*
* The ID of the root cgroup is always 0, and a new cgroup
* will be assigned with a smallest available ID.
*/
int id;
/*
* We link our 'sibling' struct into our parent's 'children'.