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Date: Wed, 10 Aug 2011 14:44:50 +0200
From: Johannes Weiner <jweiner@redhat.com>
Subject: Re: [PATCH 5/7] mm: vmscan: Do not writeback filesystem pages in
	kswapd except in high priority
Message-ID: <20110810124450.GC24133@redhat.com>
References: <1312973240-32576-1-git-send-email-mgorman@suse.de>
	<1312973240-32576-6-git-send-email-mgorman@suse.de>
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To: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>, Jan Kara <jack@suse.cz>, LKML <linux-kernel@vger.kernel.org>, XFS <xfs@oss.sgi.com>, Christoph Hellwig <hch@infradead.org>, Linux-MM <linux-mm@kvack.org>, Minchan Kim <minchan.kim@gmail.com>, Wu Fengguang <fengguang.wu@intel.com>

On Wed, Aug 10, 2011 at 11:47:18AM +0100, Mel Gorman wrote:
> It is preferable that no dirty pages are dispatched for cleaning from
> the page reclaim path. At normal priorities, this patch prevents kswapd
> writing pages.
> 
> However, page reclaim does have a requirement that pages be freed
> in a particular zone. If it is failing to make sufficient progress
> (reclaiming < SWAP_CLUSTER_MAX at any priority priority), the priority
> is raised to scan more pages. A priority of DEF_PRIORITY - 3 is
> considered to be the point where kswapd is getting into trouble
> reclaiming pages. If this priority is reached, kswapd will dispatch
> pages for writing.
> 
> Signed-off-by: Mel Gorman <mgorman@suse.de>
> Reviewed-by: Minchan Kim <minchan.kim@gmail.com>

Acked-by: Johannes Weiner <jweiner@redhat.com>

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