linux-kernel - Re: [PATCH 5/7] Don't deactivate the page if trylock

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Date:	Sun, 06 Dec 2009 15:34:28 -0500
From:	Rik van Riel <riel@...hat.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
CC:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Larry Woodman <lwoodman@...hat.com>
Subject: Re: [PATCH 5/7] Don't deactivate the page if trylock_page() is failed.

On 12/04/2009 03:44 AM, KOSAKI Motohiro wrote:
>  From 7635eaa033cfcce7f351b5023952f23f0daffefe Mon Sep 17 00:00:00 2001
> From: KOSAKI Motohiro<kosaki.motohiro@...fujitsu.com>
> Date: Fri, 4 Dec 2009 12:03:07 +0900
> Subject: [PATCH 5/7] Don't deactivate the page if trylock_page() is failed.
>
> Currently, wipe_page_reference() increment refctx->referenced variable
> if trylock_page() is failed. but it is meaningless at all.
> shrink_active_list() deactivate the page although the page was
> referenced. The page shouldn't be deactivated with young bit. it
> break reclaim basic theory and decrease reclaim throughput.
>
> This patch introduce new SWAP_AGAIN return value to
> wipe_page_reference().
>
> Signed-off-by: KOSAKI Motohiro<kosaki.motohiro@...fujitsu.com>

Reviewed-by: Rik van Riel <riel@...hat.com>

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