linux-kernel - Re: [PATCH] mm: disallow direct reclaim page writeback

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Date:	Sun, 18 Apr 2010 16:30:36 -0500
From:	James Bottomley <James.Bottomley@...e.de>
To:	Sorin Faibish <sfaibish@....com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>, Dave Chinner <david@...morbit.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Chris Mason <chris.mason@...cle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] mm: disallow direct reclaim page writeback

On Sun, 2010-04-18 at 15:10 -0400, Sorin Faibish wrote:
> On Sat, 17 Apr 2010 20:32:39 -0400, Andrew Morton
> <akpm@...ux-foundation.org> wrote:
> 
> >
> > There are two issues here: stack utilisation and poor IO patterns in
> > direct reclaim.  They are different.
> >
> > The poor IO patterns thing is a regression.  Some time several years
> > ago (around 2.6.16, perhaps), page reclaim started to do a LOT more
> > dirty-page writeback than it used to.  AFAIK nobody attempted to work
> > out why, nor attempted to try to fix it.

> I for one am looking very seriously at this problem together with Bruce.
> We plan to have a discussion on this topic at the next LSF meeting
> in Boston.

As luck would have it, the Memory Management summit is co-located with
the Storage and Filesystem workshop ... how about just planning to lock
all the protagonists in a room if it's not solved by August.  The less
extreme might even like to propose topics for the plenary sessions ...

James


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