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

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Message-Id: <20091113.132125.468378199533086916.mitake@dcl.info.waseda.ac.jp>
Date:	Fri, 13 Nov 2009 13:21:25 +0900 (JST)
From:	Hitoshi Mitake <mitake@....info.waseda.ac.jp>
To:	mingo@...e.hu
Cc:	a.p.zijlstra@...llo.nl, tglx@...utronix.de, fweisbec@...il.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH][RFC] Measuring term of acquiring spinlock

From: Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH][RFC] Measuring term of acquiring spinlock
Date: Thu, 12 Nov 2009 08:39:09 +0100

> 
> * 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.
>

Wow, I didn't know that. I'll try it.

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

If you want a tester for 'perf lock', please call me, Frederic :)
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