linux-kernel - Re: [PATCH] lock stat for -rt 2.6.20-rc2-rt2 [was Re: 2.6.19-rt14 slowdown compared to 2.6.19]

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Date:	Tue, 2 Jan 2007 15:12:34 -0800
From:	Bill Huey (hui) <billh@...ppy.monkey.org>
To:	"Chen, Tim C" <tim.c.chen@...el.com>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Bill Huey (hui)" <billh@...ppy.monkey.org>
Subject: Re: [PATCH] lock stat for -rt 2.6.20-rc2-rt2 [was Re: 2.6.19-rt14 slowdown compared to 2.6.19]

On Tue, Jan 02, 2007 at 02:51:05PM -0800, Chen, Tim C wrote:
> Bill,
> 
> I'm having some problem getting this patch to run stablely.  I'm
> encoutering errors like that in the trace that follow:
> 
> Thanks.
> Tim
> 
> Unable to handle kernel NULL pointer dereference at 0000000000000008

Yes, those are the reason why I have some aggressive asserts in the code
to try track down the problem. Try this:

http://mmlinux.sourceforge.net/public/patch-2.6.20-rc2-rt2.1.lock_stat.patch

It's got some cosmestic clean up in it to make it more Linux-ish instead
of me trying to reinvent some kind of Smalltalk system in the kernel. I'm
trying to address all of Ingo's complaints about the code so it's still a
work in progress, namely the style issues (I'd like help/suggestions on
that) and assert conventions.

It might the case that the lock isn't know to the lock stats code yet.
It's got some technical overlap with lockdep in that a lock might not be
known yet and is causing a crashing.

Try that patch and report back to me what happens.

bill

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