linux-kernel - Re: [patch 0/4] memcg: operate on page quantities internally

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Message-Id: <20110210085034.a6c5d703.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 10 Feb 2011 08:50:34 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [patch 0/4] memcg: operate on page quantities internally

On Wed,  9 Feb 2011 12:01:49 +0100
Johannes Weiner <hannes@...xchg.org> wrote:

> Hi,
> 
> this patch set converts the memcg charge and uncharge paths to operate
> on multiples of pages instead of bytes.  It already was a good idea
> before, but with the merge of THP we made a real mess by specifying
> huge pages alternatingly in bytes or in number of regular pages.
> 
> If I did not miss anything, this should leave only res_counter and
> user-visible stuff in bytes.  The ABI probably won't change, so next
> up is converting res_counter to operate on page quantities.
> 

Hmm, I think this should be done but think this should be postphoned, too.
Because, IIUC, some guys will try to discuss charging against kernel objects
in the next mm-summit. IMHO, it will be done against PAGE not against
Object even if we do kernel object accouting. So this patch is okay for me.
But I think it's better to go ahead after we confirm the way we go.
How do you think ?

Anyway, I welcome this patch.

Thanks,
-Kame



> 	Hannes
> 
>  include/linux/sched.h |    4 +-
>  mm/memcontrol.c       |  157 ++++++++++++++++++++++++-------------------------
>  2 files changed, 78 insertions(+), 83 deletions(-)
> 

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