memcg: reparent kmem on css offline

Hi,

This patch set introduces re-parenting of kmem charges on memcg css offline. The idea lying behind it is very simple - instead of pointing from kmem objects (kmem caches, non-slab kmem pages) directly to the memcg which they are charged against, we make them point to a proxy object, mem_cgroup_kmem_context, which, in turn, points to the memcg which it belongs to. As a result on memcg offline, it's enough to only re-parent the memcg's mem_cgroup_kmem_context.

Note, reparented kmem contexts will hang around until there is at least one object accounted to them, but since they are small (especially comparing to struct mem_cgroup), it's no big deal.

Reviews are appreciated.

Thanks,

Vladimir Davydov (8):
memcg: add pointer from memcg_cache_params to owner cache
memcg: keep all children of each root cache on a list
slab: guarantee unique kmem cache naming
slub: remove kmemcg id from create_unique_id
memcg: rework non-slab kmem pages charge path
memcg: introduce kmem context
memcg: move some kmem definitions upper
memcg: reparent kmem context on memcg offline

 include/linux/memcontrol.h |   88 ++++-----
 include/linux/mm_types.h   |    6 +
 include/linux/slab.h       |   17 +-
 mm/memcontrol.c            |  468 +++++++++++++++++++++-----------------------
 mm/page_alloc.c            |   22 ++-
 mm/slab.c                  |   40 ++--
 mm/slab_common.c           |   64 ++++--
 mm/slub.c                  |   45 ++---
 8 files changed, 382 insertions(+), 368 deletions(-)

1.7.10.4

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