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

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Message-ID: <20091113084030.GA5243@nowhere>
Date:	Fri, 13 Nov 2009 09:40:32 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Hitoshi Mitake <mitake@....info.waseda.ac.jp>,
	a.p.zijlstra@...llo.nl, tglx@...utronix.de,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH][RFC] Measuring term of acquiring spinlock

On Fri, Nov 13, 2009 at 09:17:22AM +0100, Ingo Molnar wrote:
> 
> * Hitoshi Mitake <mitake@....info.waseda.ac.jp> wrote:
> 
> > 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.
> 
> Btw., i think we should rename that tracepoint category from 'lockdep' 
> to 'lock'. It's possible to enable them without CONFIG_PROVE_LOCKING, 
> and they arent high-overhead in that case.
> 
> 	Ingo


I have a pending patch for that somewhere. I can send it right away.

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