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Subject: Re: [PATCH 8/8] mm: vmscan: Do not writeback filesystem pages from
	kswapd
From: Peter Zijlstra <peterz@infradead.org>
In-Reply-To: <1311265730-5324-9-git-send-email-mgorman@suse.de>
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	<1311265730-5324-9-git-send-email-mgorman@suse.de>
Date: Fri, 22 Jul 2011 14:57:12 +0200
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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>, Johannes Weiner <jweiner@redhat.com>

On Thu, 2011-07-21 at 17:28 +0100, Mel Gorman wrote:
> Assuming that flusher threads will always write back dirty pages promptly
> then it is always faster for reclaimers to wait for flushers. This patch
> prevents kswapd writing back any filesystem pages. 

That is a somewhat sort changelog for such a big assumption ;-)

I think it can use a few extra words to explain the need to clean pages
from @zone vs writeback picks whatever fits best on disk and how that
works out wrt the assumption.

What requirements does this place on writeback and how does it meet
them.

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