linux-kernel - Re: [PATCH 06/10] mm: vmscan: Have kswapd writeback pages based on dirty pages encountered, not priority

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Message-ID: <20130418151650.GH2018@cmpxchg.org>
Date:	Thu, 18 Apr 2013 08:16:50 -0700
From:	Johannes Weiner <hannes@...xchg.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Valdis Kletnieks <Valdis.Kletnieks@...edu>,
	Rik van Riel <riel@...hat.com>,
	Zlatko Calusic <zcalusic@...sync.net>,
	dormando <dormando@...ia.net>, Michal Hocko <mhocko@...e.cz>,
	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 06/10] mm: vmscan: Have kswapd writeback pages based on
 dirty pages encountered, not priority

On Thu, Apr 11, 2013 at 08:57:54PM +0100, Mel Gorman wrote:
> Currently kswapd queues dirty pages for writeback if scanning at an elevated
> priority but the priority kswapd scans at is not related to the number
> of unqueued dirty encountered.  Since commit "mm: vmscan: Flatten kswapd
> priority loop", the priority is related to the size of the LRU and the
> zone watermark which is no indication as to whether kswapd should write
> pages or not.
> 
> This patch tracks if an excessive number of unqueued dirty pages are being
> encountered at the end of the LRU.  If so, it indicates that dirty pages
> are being recycled before flusher threads can clean them and flags the
> zone so that kswapd will start writing pages until the zone is balanced.
> 
> Signed-off-by: Mel Gorman <mgorman@...e.de>

Acked-by: Johannes Weiner <hannes@...xchg.org>
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