[PATCH 0/6 v3] memcg: page cgroup diet

Here is my page_cgroup diet series v3. Since v2, "remove PCG_CACHE" is alread
merged.

This series changes page-stat-accounting per memcg 

from:
	if (change page's state)
		mem_cgroup_update_page_state()

to:
	mem_cgroup_begin_update_page_state()
	if (change page's state)
		mem_cgroup_update_page_state()
	mem_cgroup_end_update_page_state()

(see patch 4 for details.) This allows us not to duplicate page struct's
information in page_cgroup's flag field.

Because above sequence adds 2 extra calls to hot-path, performance will be problem.
Patch 6 is a fix for performance, and I don't see performance regression in my
small test. (see patch 6 for details.)

Thanks,
-Kame






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