linux-kernel - [PATCH] lock stat for -rt 2.6.20-rc2-rt2.2.lock

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Message-ID: <20070103074124.GA25594@gnuppy.monkey.org>
Date:	Tue, 2 Jan 2007 23:41:24 -0800
From:	Bill Huey (hui) <billh@...ppy.monkey.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"Chen, Tim C" <tim.c.chen@...el.com>, 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>,
	Daniel Walker <dwalker@...sta.com>
Subject: [PATCH] lock stat for -rt 2.6.20-rc2-rt2.2.lock_stat.patch

On Sat, Dec 30, 2006 at 12:19:40PM +0100, Ingo Molnar wrote:
> your patch looks pretty ok to me in principle. A couple of suggestions 
> to make it more mergable:
> 
>  - instead of BUG_ON()s please use DEBUG_LOCKS_WARN_ON() and make sure 
>    the code is never entered again if one assertion has been triggered.
>    Pass down a return result of '0' to signal failure. See
>    kernel/lockdep.c about how to do this. One thing we dont need are
>    bugs in instrumentation bringing down a machine.

I'm using a non-fatal error checking instead of BUG_ON. BUG_ON was a more
aggressive way that I use to find problem initiallly.

>  - remove dead (#if 0) code

Done.

>  - Documentation/CodingStyle compliance - the code is not ugly per se
>    but still looks a bit 'alien' - please try to make it look Linuxish,
>    if i apply this we'll probably stick with it forever. This is the
>    major reason i havent applied it yet.

I reformatted most of the patch to be 80 column limited. I simplified a
number of names, but I'm open to suggestions and patches to how to go
about this. Much of this code was a style experiment, but now I have to
make this more mergable.

>  - the xfs/wrap_lock change looks bogus - the lock is initialized
>    already. What am i missing?

Correct. This has been removed.

I've applied Daniel Walker's changes as well.

Patch here:

	http://mmlinux.sourceforge.net/public/patch-2.6.20-rc2-rt2.2.lock_stat.patch

bill

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