linux-kernel - Re: [PATCH v2] memcg: update documentation to describe usage_in

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Message-Id: <20110329102445.a46760ef.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 29 Mar 2011 10:24:45 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Cc:	Michal Hocko <mhocko@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] memcg: update documentation to describe
 usage_in_bytes

On Tue, 29 Mar 2011 10:15:11 +0900
Daisuke Nishimura <nishimura@....nes.nec.co.jp> wrote:

> ===
> From: Daisuke Nishimura <nishimura@....nes.nec.co.jp>
> 
> Since 569b846d(memcg: coalesce uncharge during unmap/truncate), we do batched
> (delayed) uncharge at truncation/unmap. And since cdec2e42(memcg: coalesce
> charging via percpu storage), we have percpu cache for res_counter.
> 
> These changes improved performance of memory cgroup very much, but made
> res_counter->usage usually have a bigger value than the actual value of memory usage.
> So, *.usage_in_bytes, which show res_counter->usage, are not desirable for precise
> values of memory(and swap) usage anymore.
> 
> Instead of removing these files completely(because we cannot know res_counter->usage
> without them), this patch updates the meaning of those files.
> 
> Signed-off-by: Daisuke Nishimura <nishimura@....nes.nec.co.jp>

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

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