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Re: [PATCH 8/8] mm: vmscan: Do not writeback filesystem pages from kswap

To: Mel Gorman <mgorman@xxxxxxx>
Subject: Re: [PATCH 8/8] mm: vmscan: Do not writeback filesystem pages from kswapd
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Fri, 22 Jul 2011 14:57:12 +0200
Cc: Linux-MM <linux-mm@xxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, XFS <xfs@xxxxxxxxxxx>, Dave Chinner <david@xxxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Johannes Weiner <jweiner@xxxxxxxxxx>, Wu Fengguang <fengguang.wu@xxxxxxxxx>, Jan Kara <jack@xxxxxxx>, Rik van Riel <riel@xxxxxxxxxx>, Minchan Kim <minchan.kim@xxxxxxxxx>
In-reply-to: <1311265730-5324-9-git-send-email-mgorman@xxxxxxx>
References: <1311265730-5324-1-git-send-email-mgorman@xxxxxxx> <1311265730-5324-9-git-send-email-mgorman@xxxxxxx>
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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