linux-kernel - [RFC] [PATCH 0/6 v3] memcg: page cgroup diet

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Date:	Mon, 6 Feb 2012 19:06:27 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"linux-mm@...ck.org" <linux-mm@...ck.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hannes@...xchg.org" <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>, Ying Han <yinghan@...gle.com>,
	Hugh Dickins <hughd@...gle.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: [RFC] [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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