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Date: Fri, 5 Nov 2010 13:01:40 +0100
From: Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: [PATCH 1/2 v2] writeback: integrated background writeback work
Message-ID: <20101105120139.GB23393@cmpxchg.org>
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To: Wu Fengguang <fengguang.wu@intel.com>
Cc: Christoph Hellwig <hch@infradead.org>, Andrew Morton <akpm@linux-foundation.org>, Jan Kara <jack@suse.cz>, "linux-mm@kvack.org" <linux-mm@kvack.org>, Mel Gorman <mel@csn.ul.ie>, Rik van Riel <riel@redhat.com>, Minchan Kim <minchan.kim@gmail.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, Dave Chinner <david@fromorbit.com>, "linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>
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On Tue, Nov 02, 2010 at 04:39:47AM +0800, Wu Fengguang wrote:
> From: Jan Kara <jack@suse.cz>
> 
> Check whether background writeback is needed after finishing each work.
> 
> When bdi flusher thread finishes doing some work check whether any kind
> of background writeback needs to be done (either because
> dirty_background_ratio is exceeded or because we need to start flushing
> old inodes). If so, just do background write back.
> 
> This way, bdi_start_background_writeback() just needs to wake up the
> flusher thread. It will do background writeback as soon as there is no
> other work.
> 
> This is a preparatory patch for the next patch which stops background
> writeback as soon as there is other work to do.
> 
> Signed-off-by: Jan Kara <jack@suse.cz>
> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>

Reviewed-by: Johannes Weiner <hannes@cmpxchg.org>

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