Date: Thu, 23 Dec 2010 14:35:21 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: David Rientjes <rientjes@google.com>
Cc: Mel Gorman <mel@csn.ul.ie>, Greg Kroah-Hartman <gregkh@suse.de>,
        Kyle McMartin <kyle@mcmartin.ca>, Shaohua Li <shaohua.li@intel.com>,
        KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
        Christoph Lameter <cl@linux.com>,
        KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 1/2] mm: page allocator: Adjust the per-cpu counter
 threshold when memory is low
Message-Id: <20101223143521.f94a5106.akpm@linux-foundation.org>
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On Thu, 23 Dec 2010 14:18:38 -0800 (PST)
David Rientjes <rientjes@google.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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