[PATCH 0/4] fix THP and memcg issues v3

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

I found PCG_ACCT_LRU is copied at splitting in patch 2/4 but it will cause
VM_BUG_ON(). The fix for it was in patch 3/4...This set is a corrected one.
==
Now, when THP is enabled, memcg's counter goes wrong. Moreover, rmdir()
may not end. I fixed some races since v1.


This series is a fix for obviouse counter breakage. When you test,
CONFIG_TRANSPARENT_HUGEPAGE=y
CONFIG_TRANSPARENT_HUGEPAGE_ALWAYS=y

is appreciated. Tests should be done is:

# mount -t cgroup none /cgroup/memory -omemory
# mkdir /cgroup/memory/A
# mkdir /cgroup/memory/A/B
# run some programs under B.
# echo 0 > /cgroup/memory/A/B/memory.force_empty

and check B's memory.stat shows RSS/CACHE/LRU are all 0.
Moving tasks while running is another good test.

I know there are another problem when memory cgroup hits limit and
reclaim in busy. But I will fix it in another patch.

Thanks,
-Kame

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