This patchset converts memcg to use cgroup->id, and then we can remove
cgroup css_id.
As we've removed memcg's own refcnt, converting memcg to use cgroup->id
is very straight-forward.
The patchset is based on Tejun's cgroup tree.
v4:
- make cgroup_from_id() inline and check if cgroup_mutex is held.
- add a comment for idr_remove() in cgroup_offline)fn().
v2->v3:
- some minor cleanups suggested by Michal.
- fixed the call to idr_alloc() in cgroup_init() in the first patch.
Li Zefan (8):
cgroup: convert cgroup_ida to cgroup_idr
cgroup: document how cgroup IDs are assigned
cgroup: implement cgroup_from_id()
memcg: convert to use cgroup_is_descendant()
memcg: convert to use cgroup id
memcg: fail to create cgroup if the cgroup id is too big
memcg: stop using css id
cgroup: kill css_id
--
include/linux/cgroup.h | 65 ++++++--------
kernel/cgroup.c | 285 ++++++-----------------------------------------------------
mm/memcontrol.c | 68 ++++++++------
3 files changed, 96 insertions(+), 322 deletions(-)
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