linux-kernel - Re: [PATCH 0/9] V2: idle page tracking / working set estimation

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Date:	Fri, 30 Sep 2011 14:19:14 -0400
From:	Eric B Munson <emunson@...bm.net>
To:	Michel Lespinasse <walken@...gle.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Rik van Riel <riel@...hat.com>,
	Balbir Singh <bsingharora@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <jweiner@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Hugh Dickins <hughd@...gle.com>,
	Michael Wolf <mjwolf@...ibm.com>
Subject: Re: [PATCH 0/9] V2: idle page tracking / working set estimation

On Thu, 29 Sep 2011, Eric B Munson wrote:

> On Thu, 29 Sep 2011 13:25:00 -0700, Michel Lespinasse wrote:
> >On Thu, Sep 29, 2011 at 9:43 AM, Eric B Munson <emunson@...bm.net>
> >wrote:
> >>I have been trying to test these patches since yesterday
> >>afternoon.  When my
> >>machine is idle, they behave fine.  I started looking at
> >>performance to make
> >>sure they were a big regression by testing kernel builds with
> >>the scanner
> >>disabled, and then enabled (set to 120 seconds).  The scanner
> >>disabled builds
> >>work fine, but with the scanner enabled the second time I build
> >>my kernel hangs
> >>my machine every time.  Unfortunately, I do not have any more
> >>information than
> >>that for you at the moment.  My next step is to try the same
> >>tests in qemu to
> >>see if I can get more state information when the kernel hangs.
> >
> >Could you please send me your .config file ? Also, did you apply the
> >patches on top of straight v3.0 and what is your machine like ?
> >
> >Thanks,
> 
> 
> My .config will come separately to you.  I applied the patches to
> Linus' master branch as of yesterday.  My machine is a single Xeon
> 5690 with 12G of ram (do you need more details than that?)
> 
> Thanks,
> Eric

I am able to recreate on a second desktop I have here (same model CPU but a
different MB so I am fairly sure it isn't dying hardware).  It looks to me like
a CPU softlocks and it stalls the process active there, so most recently that
was XOrg.  The machine lets me login via ssh for a few minutes, but things like
ps and cat or /proc files will start to work and give some output but hang.
I cannot call reboot, nor can I sync the fs and reboot via SysRq.  My next step
is to setup a netconsole to see if anything comes out in the syslog that I
cannot see.

Eric

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