linux-kernel - Re: [PATCH 8/8] mm: vmscan: Do not writeback filesystem pages from kswapd

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Date:	Fri, 22 Jul 2011 14:57:12 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Linux-MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	XFS <xfs@....sgi.com>, Dave Chinner <david@...morbit.com>,
	Christoph Hellwig <hch@...radead.org>,
	Johannes Weiner <jweiner@...hat.com>,
	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Rik van Riel <riel@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>
Subject: Re: [PATCH 8/8] mm: vmscan: Do not writeback filesystem pages from
 kswapd

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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