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authorTejun Heo <tj@kernel.org>2014-05-04 15:09:13 -0400
committerTejun Heo <tj@kernel.org>2014-05-04 15:09:13 -0400
commit7d699ddb2b181a2c76e5ea18b1bdf102c4bebe4b (patch)
tree0811810b37ff735921b689aa1ca273ecf253e29c /include/linux/cgroup.h
parent69dfa00ccb72a37f3810687ca110e5a8154c6eed (diff)
cgroup, memcg: allocate cgroup ID from 1
Currently, cgroup->id is allocated from 0, which is always assigned to the root cgroup; unfortunately, memcg wants to use ID 0 to indicate invalid IDs and ends up incrementing all IDs by one. It's reasonable to reserve 0 for special purposes. This patch updates cgroup core so that ID 0 is not used and the root cgroups get ID 1. The ID incrementing is removed form memcg. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Michal Hocko <mhocko@suse.cz> Cc: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Li Zefan <lizefan@huawei.com>
Diffstat (limited to 'include/linux/cgroup.h')
-rw-r--r--include/linux/cgroup.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index c6c703f2486b..793f70a48820 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -144,8 +144,8 @@ struct cgroup {
/*
* 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.
+ * ID 0 is not used, the ID of the root cgroup is always 1, and a
+ * new cgroup will be assigned with a smallest available ID.
*
* Allocating/Removing ID must be protected by cgroup_mutex.
*/