linux-kernel - Re: meminfo Committed

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Date:	Tue, 28 Apr 2009 01:17:11 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	balbir@...ux.vnet.ibm.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, ebmunson@...ibm.com,
	mel@...ux.vnet.ibm.com, cl@...ux-foundation.org, stable@...nel.org
Subject: Re: meminfo Committed_AS underflows

On Mon, 2009-04-27 at 20:27 -0700, Andrew Morton wrote:
> There's potential here for weird performance regressions, so I think
> that if we do this in mainline, we should wait a while (a few weeks?)
> before backporting it.
> 
> Do we know how long this bug has existed for?  Quite a while, I
> expect?

Yeah, we didn't notice it until a recent enterprise distro got a config
with NR_CPUS=1024.  That opened the window up in a major way because of
the way we calculated the threshold.

-- Dave

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