[PATCH -mm 0/6] memcg: release memcg_cache_id on css offline

[Vladimir Davydov <vdavydov@parallels.com>]

Hi,

Currently memcg_cache_id (mem_cgroup->kmemcg_id), which is used for
indexing memcg_caches arrays, is released only on css free. As a result,
offline css, whose number is actually limited only by amount of free
RAM, will occupy slots in these arrays making them grow larger and
larger even if there's only a few kmem active memory cgroups out there.

This patch set makes memcg release memcg_cache_id on css offline. This
way the memcg_caches arrays size will be limited by the number of alive
kmem-active memory cgroups, which is much better.

The work is actually done in patch 6 while patches 1-5 only prepare
memcg and slab subsystems to this change.

Thanks,

Vladimir Davydov (6):
  slub: remove kmemcg id from create_unique_id
  slab: use mem_cgroup_id for per memcg cache naming
  memcg: make memcg_cache_id static
  memcg: add pointer to owner cache to memcg_cache_params
  memcg: keep all children of each root cache on a list
  memcg: release memcg_cache_id on css offline

 include/linux/memcontrol.h |    9 +---
 include/linux/slab.h       |    7 ++-
 mm/memcontrol.c            |  112 +++++++++++++++++++++++++++-----------------
 mm/slab.c                  |   40 +++++++++-------
 mm/slab_common.c           |   44 ++++++++---------
 mm/slub.c                  |   45 +++++++++---------
 6 files changed, 140 insertions(+), 117 deletions(-)

-- 
1.7.10.4

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