linux-kernel - Re: [patch 1/4] memcg: use native word to represent dirtyable pages

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Message-ID: <AANLkTi=qO84k-KWaG2R_nQr7vxRA2E7DbO4=XhVrFzjv@mail.gmail.com>
Date:	Mon, 8 Nov 2010 07:56:43 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Greg Thelen <gthelen@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Young <hidave.darkstar@...il.com>,
	Andrea Righi <arighi@...eler.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Wu Fengguang <fengguang.wu@...el.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 1/4] memcg: use native word to represent dirtyable pages

On Mon, Nov 8, 2010 at 7:14 AM, Johannes Weiner <hannes@...xchg.org> wrote:
> The memory cgroup dirty info calculation currently uses a signed
> 64-bit type to represent the amount of dirtyable memory in pages.
>
> This can instead be changed to an unsigned word, which will allow the
> formula to function correctly with up to 160G of LRU pages on a 32-bit
> system, assuming 4k pages.  That should be plenty even when taking
> racy folding of the per-cpu counters into account.
>
> This fixes a compilation error on 32-bit systems as this code tries to
> do 64-bit division.
>
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>
> Reported-by: Dave Young <hidave.darkstar@...il.com>
Reviewed-by: Minchan Kim <minchan.kim@...il.com>


-- 
Kind regards,
Minchan Kim
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