linux-kernel - Re: aim7 scalability issue on 4 socket machine

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Message-Id: <20090917195909.3a00ef83.akpm@linux-foundation.org>
Date:	Thu, 17 Sep 2009 19:59:09 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Cc:	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Andi Kleen <andi@...stfloor.org>,
	"lee.schermerhorn@...com" <lee.schermerhorn@...com>
Subject: Re: aim7 scalability issue on 4 socket machine

On Fri, 18 Sep 2009 10:02:19 +0800 "Zhang, Yanmin" <yanmin_zhang@...ux.intel.com> wrote:

> > > Did you see Lee's patch?:
> > > 
> > >  http://lkml.org/lkml/2009/9/9/290
> > > 
> > > Added Lee and Hugh to CC, retained the below patch for them.
> > 
> > Thanks a lot for the CC, Peter.
> > See my reply to that mail for the slightly corrected version.
> > 
> > Yes, Yanmin and Lee appear to be fixing exactly the same issue.
> > I haven't thought through Yanmin's version for correctness, but
> > it lacks the vm_start check I added to Lee's, and I do prefer
> > Lee's style - hey, nothing personal!
> > 
> > So, Yanmin, please retest with http://lkml.org/lkml/2009/9/13/25
> > and let us know if that works as well for you - thanks.
> I tested Lee's patch and it does fix the issue.

Do we think we should cook up something for -stable?

Either this is a regression or the workload is particularly obscure. 

aim7 is sufficiently non-obscure to make me wonder what's happened here?

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