kmemcg reparenting

[rebased on top of v3.14-rc6-mmotm-2014-03-12-16-04]

Hi,

During my recent attempt to push kmemcg shrinkers, I was pointed out that current kmemcg implementation has a serious design flaw - it lacks reparenting. Currently each memcg cache holds a css ref to its memcg and does not let it go until the cache is emptied. Although this approach is simple, it leads to memcgs hanging around for quite a long time after the death, which is ugly. Building something on top of that is unacceptable. So this patch set targets on implementing reparenting for kmemcg charges.

[ for more details see the discussion thread:
https://lkml.org/lkml/2014/2/11/623 ]

It is based on top of 3.14-rc6-mmotm and organized as follows:
- Patches 1-3 fix some nasty races in kmemcg implementation. I could not let them live any longer, because they touch the code I'm going to modify.
- Patches 4-6 prepare memcg_cache_params for reparenting.
- Patch 7 rework slab charging making it easier to track and therefore reparent kmem charges, and patches 8-10 kill the old charging code.
- Patch 11 introduces kmemcg reparenting.
- Patch 12 is for slub. It fixes sysfs naming clashes that can arise due to reparented caches.

Please note that this patch set does not resolve all kmemcg-related issues - there are still plenty of them (e.g. "dangling" caches), but it is already big enough so I guess I'll address them later when this one is committed (if it will be committed at all, of course).

Many thanks to Johannes Weiner, who proposed the idea and kindly outlined basic design principles.

Thanks,

Vladimir Davydov (12):
memcg: flush cache creation works before memcg cache destruction
memcg: fix race in memcg cache destruction path
memcg: fix root vs memcg cache destruction race
memcg: move slab caches list/mutex init to memcg creation
memcg: add pointer from memcg_cache_params to cache
memcg: keep all children of each root cache on a list
memcg: rework slab charging
memcg: do not charge kmalloc_large allocations
fork: do not charge thread_info to kmemcg
memcg: kill GFP_KMEMCG and stuff
memcg: reparent slab on css offline
slub: make sure all memcg caches have unique names on sysfs

 include/linux/gfp.h             |    5 -
 include/linux/memcontrol.h      |  133 ++-------
 include/linux/slab.h            |   15 +-
 include/linux/thread_info.h     |    2 -
 include/trace/events/gfpflags.h |    1 -
 kernel/fork.c                   |    4 +-
 mm/memcontrol.c                 |  579 +++++++++++++++++----------------------
 mm/page_alloc.c                 |   35 ---
 mm/slab.c                       |   47 ++--
 mm/slab.h                       |   17 +-
 mm/slab_common.c                |  100 +++++--
 mm/slub.c                       |   85 ++++--
 12 files changed, 469 insertions(+), 554 deletions(-)

1.7.10.4

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