linux-kernel - Re: Lock dependency based tree report in perf lock

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Date:	Mon, 01 Feb 2010 10:21:09 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Hitoshi Mitake <mitake@....info.waseda.ac.jp>,
	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Lock dependency based tree report in perf lock

On Mon, 2010-02-01 at 02:23 +0100, Frederic Weisbecker wrote:
> On Sat, Jan 30, 2010 at 09:46:28AM +0100, Peter Zijlstra wrote:
> > On Sat, 2010-01-30 at 00:17 +0100, Frederic Weisbecker wrote:
> > > 
> > > 
> > > Anyway, that's just an idea, not trivial I must admit.
> > 
> > lockdep actually collects all this information, so writing it out isn't
> > too hard.
> 
> 
> Hmm, I'm discovering the /proc/lock_stat file this evening, did not
> know it exist :)
> 
> Still, a tree representation can bring another dimension.

current->held_locks[i]->instance, i < current->lock_depth

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