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

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Date:	Wed, 8 Sep 2010 08:15:28 +0200
From:	Johannes Weiner <hannes@...xchg.org>
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>,
	Minchan Kim <minchan.kim@...il.com>,
	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: Johannes Weiner <hannes@...xchg.org>

> ---
>  mm/vmscan.c |    2 --
>  1 files changed, 0 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index eabe987..5979850 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1341,8 +1341,6 @@ shrink_inactive_list(unsigned long nr_to_scan, struct zone *zone,
>  
>  	/* Check if we should syncronously wait for writeback */
>  	if (should_reclaim_stall(nr_taken, nr_reclaimed, priority, sc)) {
> -		wait_iff_congested(zone, BLK_RW_ASYNC, HZ/10);
> -
>  		/*
>  		 * The attempt at page out may have made some
>  		 * of the pages active, mark them inactive again.
--
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