[PATCH RESEND -mm 00/12] kmemcg reparenting

From: Vladimir Davydov
Date: Thu Mar 13 2014 - 11:07:02 EST


[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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/