linux-kernel - Re: [RFC] [Patch 4/4] lock contention tracking slimmed down

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Message-ID: <46698B1D.3000806@de.ibm.com>
Date:	Fri, 08 Jun 2007 19:00:13 +0200
From:	Martin Peschke <mp3@...ibm.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	linux-kernel@...r.kernel.org, jbaron@...hat.com,
	rostedt@...dmis.org, billh@...ppy.monkey.org, mingo@...e.hu,
	linux-s390@...r.kernel.org
Subject: Re: [RFC] [Patch 4/4] lock contention tracking slimmed down

Peter Zijlstra wrote:
> I'm confused as to where the class->stat objects are initialised? Is
> that done in lock_stat_init()? If so, then you have a bug.

static struct lock_class lock_classes[MAX_LOCKDEP_KEYS];

I assume this gets us class structures containing all zeros, doesn't it?
Then class->stat is zeros as well, which is handled by lib/statistics.
(In this case, data gathering hasn't been turned on yet, and statistic_inc()
and similar functions don't access other areas of struct statistic.)

Martin

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