linux-kernel - Re: [RFC][PATCH] Remove cgroup member from struct page

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Message-Id: <20080903123306.316beb9d.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 3 Sep 2008 12:33:06 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	Andrew Morton <akpm@...ux-foundation.org>, hugh@...itas.com,
	menage@...gle.com, xemul@...nvz.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [RFC][PATCH] Remove cgroup member from struct page

On Tue, 02 Sep 2008 18:07:18 +0530
Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
> I understand your concern and I am not trying to reduce memcg's performance - or
> add a fancy feature. I am trying to make memcg more friendly for distros. I see
> your point about the overhead. I just got back my results - I see a 4% overhead
> with the patches. Let me see if I can rework them for better performance.
> 
Just an idea, by using atomic_ops page_cgroup patch, you can encode page_cgroup->lock
to page_cgroup->flags and use bit_spinlock(), I think.
(my new patch set use bit_spinlock on page_cgroup->flags for avoiding some race.)

This will save extra 4 bytes.

Thanks,
-Kame

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