linux-kernel - Re: [PATCH 05/10] vmscan: Synchrounous lumpy reclaim use lock_page() instead trylock

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Date:	Thu, 9 Sep 2010 12:15:47 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Mel Gorman <mel@....ul.ie>, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org,
	Linux Kernel List <linux-kernel@...r.kernel.org>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Dave Chinner <david@...morbit.com>,
	Chris Mason <chris.mason@...cle.com>,
	Christoph Hellwig <hch@....de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 05/10] vmscan: Synchrounous lumpy reclaim use
 lock_page() instead trylock_page()

On Thu, 9 Sep 2010 12:04:48 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> On Mon,  6 Sep 2010 11:47:28 +0100
> Mel Gorman <mel@....ul.ie> wrote:
> 
> > From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> > 
> > With synchrounous lumpy reclaim, there is no reason to give up to reclaim
> > pages even if page is locked. This patch uses lock_page() instead of
> > trylock_page() in this case.
> > 
> > Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> > Signed-off-by: Mel Gorman <mel@....ul.ie>
> 
> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 
Ah......but can't this change cause dead lock ??

Thanks,
-Kame

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