linux-kernel - Re: [PATCH 5/7] mm: vmscan: Do not writeback filesystem pages in kswapd except in high priority

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Message-Id: <20110811181029.d3c10169.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 11 Aug 2011 18:10:29 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
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 5/7] mm: vmscan: Do not writeback filesystem pages in
 kswapd except in high priority

On Wed, 10 Aug 2011 11:47:18 +0100
Mel Gorman <mgorman@...e.de> 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@...e.de>
> Reviewed-by: Minchan Kim <minchan.kim@...il.com>


Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

BTW, I'd like to see summary of the effect of priority..

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