Commit b414dc09 authored Jul 31, 2013 by Li Zefan Committed by Tejun Heo Jul 31, 2013

cgroup: document how cgroup IDs are assigned



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>

parent 4e96ee8e

include/linux/cgroup.h

+7 −1

Original line number	Diff line number	Diff line
		@@ -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'.