linux-kernel - Re: [PATCH 04/10] vmscan: Synchronous lumpy reclaim should not call congestion

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Message-ID: <20100907152614.GC4620@barrios-desktop>
Date:	Wed, 8 Sep 2010 00:26:14 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	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>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.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 04/10] vmscan: Synchronous lumpy reclaim should not
 call congestion_wait()

On Mon, Sep 06, 2010 at 11:47:27AM +0100, Mel Gorman wrote:
> From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> 
> congestion_wait() mean "waiting queue congestion is cleared".  However,
> synchronous lumpy reclaim does not need this congestion_wait() as
> shrink_page_list(PAGEOUT_IO_SYNC) uses wait_on_page_writeback()
> and it provides the necessary waiting.
> 
> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> Signed-off-by: Mel Gorman <mel@....ul.ie>
Reviewed-by: Minchan Kim <minchan.kim@...il.com>

-- 
Kind regards,
Minchan Kim
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