linux-kernel - Re: [RFC PATCH 0/8] Reduce filesystem writeback from page reclaim v2

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Message-ID: <20110729094816.GG1843@barrios-desktop>
Date:	Fri, 29 Jul 2011 18:48:16 +0900
From:	Minchan Kim <minchan.kim@...il.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>
Subject: Re: [RFC PATCH 0/8] Reduce filesystem writeback from page reclaim v2

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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