linux-kernel - Re: [PATCH][RFC] Measuring term of acquiring spinlock

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Message-ID: <20091112073909.GB31719@elte.hu>
Date:	Thu, 12 Nov 2009 08:39:09 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Hitoshi Mitake <mitake@....info.waseda.ac.jp>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frédéric Weisbecker 
	<fweisbec@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH][RFC] Measuring term of acquiring spinlock


* Hitoshi Mitake <mitake@....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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