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Date: Fri, 29 Jul 2011 18:48:16 +0900
From: Minchan Kim <minchan.kim@gmail.com>
Subject: Re: [RFC PATCH 0/8] Reduce filesystem writeback from page reclaim v2
Message-ID: <20110729094816.GG1843@barrios-desktop>
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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>, Wu Fengguang <fengguang.wu@intel.com>, Johannes Weiner <jweiner@redhat.com>

On Thu, Jul 28, 2011 at 12:38:52PM +0100, Mel Gorman wrote:
> On Thu, Jul 28, 2011 at 01:18:21AM +0900, Minchan Kim wrote:
> > On Thu, Jul 21, 2011 at 05:28:42PM +0100, Mel Gorman wrote:
> > > Note how preventing kswapd reclaiming dirty pages pushes up its CPU

<snip>

> > > usage as it scans more pages but it does not get excessive due to
> > > the throttling.
> > 
> > Good to hear.
> > The concern of this patchset was early OOM kill with too many scanning.
> > I can throw such concern out from now on.
> > 
> 
> At least, I haven't been able to trigger a premature OOM.

AFAIR, Andrew had a premature OOM problem[1] but I couldn't track down at that time.
I think this patch series might solve his problem. Although it doesn't, it should not accelerate
his problem, at least.

Andrew, Could you test this patchset?

[1] https://lkml.org/lkml/2011/5/25/415
-- 
Kind regards,
Minchan Kim

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