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

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Date:	Wed, 3 Jan 2007 17:27:09 -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>,
	Daniel Walker <dwalker@...sta.com>
Subject: Re: [PATCH] lock stat for -rt 2.6.20-rc2-rt2.2.lock_stat.patch

On Wed, Jan 03, 2007 at 05:11:04PM -0800, Chen, Tim C wrote:
> Bill Huey (hui) wrote:
> > 
> > Thanks, the numbers look a bit weird in that the first column should
> > have a bigger number of events than that second column since it is a
> > special case subset. Looking at the lock_stat_note() code should show
> > that to be the case. Did you make a change to the output ?
> 
> No, I did not change the output.  I did reset to the contention content
> 
> by doing echo "0" > /proc/lock_stat/contention.
> 
> I noticed that the first column get reset but not the second column. So
> the reset code probably need to be checked.

This should have the fix. 

	http://mmlinux.sf.net/public/patch-2.6.20-rc2-rt2.3.lock_stat.patch

If you can rerun it and post the results, it'll hopefully show the behavior 
of that lock acquisition better.

Thanks

bill

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