linux-kernel - Re: [PATCH 1/2] mm: page allocator: Adjust the per-cpu counter threshold when memory is low

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Date:	Thu, 23 Dec 2010 14:35:21 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Mel Gorman <mel@....ul.ie>, Greg Kroah-Hartman <gregkh@...e.de>,
	Kyle McMartin <kyle@...artin.ca>,
	Shaohua Li <shaohua.li@...el.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Christoph Lameter <cl@...ux.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 1/2] mm: page allocator: Adjust the per-cpu counter
 threshold when memory is low

On Thu, 23 Dec 2010 14:18:38 -0800 (PST)
David Rientjes <rientjes@...gle.com> wrote:

> On Mon, 29 Nov 2010, Mel Gorman wrote:
> 
> > Andrew, this patch was a performance fix but is a report saying that it
> > fixes a functional regression in Fedora enough to push a patch torwards
> > stable even though an explanation as to *why* it fixes the problem is missing?
> > 
> 
> We had to pull aa454840 "mm: page allocator: calculate a better estimate 
> of NR_FREE_PAGES when memory is low and kswapd is awake" from 2.6.36 
> internally because tests showed that it would cause the machine to stall 
> as the result of heavy kswapd activity.  I merged it back with this fix as 
> it is pending in the -mm tree and it solves the issue we were seeing, so I 
> definitely think this should be pushed to -stable (and I would seriously 
> consider it for 2.6.37 inclusion even at this late date).

How's about I send
mm-page-allocator-adjust-the-per-cpu-counter-threshold-when-memory-is-low.patch
in for 2.6.38 and tag it for backporting into 2.6.37.1 and 2.6.36.x? 
That way it'll get a bit of 2.6.38-rc testing before being merged into
2.6.37.x.
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