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

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Message-ID: <alpine.DEB.2.00.1012231413560.2116@chino.kir.corp.google.com>
Date:	Thu, 23 Dec 2010 14:18:38 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Mel Gorman <mel@....ul.ie>, Greg Kroah-Hartman <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>
cc:	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 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).
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