Date: Thu, 12 Nov 2009 08:39:09 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>,
       Peter Zijlstra <a.p.zijlstra@chello.nl>,
       Thomas Gleixner <tglx@linutronix.de>,
       =?unknown-8bit?B?RnLDqWTDqXJpYw==?= Weisbecker 
	<fweisbec@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH][RFC] Measuring term of acquiring spinlock
Message-ID: <20091112073909.GB31719@elte.hu>
References: <20091112.154353.680961628170545165.mitake@dcl.info.waseda.ac.jp>
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* Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp> wrote:

> * Description
> 
> This patch makes the file spinlock_stats on top of the debugfs.
> When user reads this file, some statistical data related to
> spinlocks are printed.

hm, are you aware of the lockstat tracepoints? They do something like 
this - and it utilizes perf events to report these events. See 
include/trace/events/lockdep.h. Needs CONFIG_LOCK_STAT enabled.

Might make sense to put it into 'perf lock' kind of tool. I think 
Frederic had such plans.

	Ingo
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