cgroup, memcg: allocate cgroup ID from 1

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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>

...

This commit is contained in:

Tejun Heo 2014-05-04 15:09:13 -04:00

parent 69dfa00ccb

commit 7d699ddb2b

3 changed files with 6 additions and 10 deletions

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4

include/linux/cgroup.h

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4

kernel/cgroup.c

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8

mm/memcontrol.c

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