linux-kernel - Re: [PATCH 00/12] perf lock: New subcommand "perf lock", for analyzing lock statistics

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Message-ID: <1264178909.4283.1543.camel@laptop>
Date:	Fri, 22 Jan 2010 17:48:29 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jason Baron <jbaron@...hat.com>
Cc:	Hitoshi Mitake <mitake@....info.waseda.ac.jp>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Paul Mackerras <paulus@...ba.org>,
	Tom Zanussi <tzanussi@...il.com>,
	Steven Rostedt <srostedt@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: [PATCH 00/12] perf lock: New subcommand "perf lock", for
 analyzing lock statistics

On Fri, 2010-01-22 at 11:42 -0500, Jason Baron wrote:
> On Fri, Jan 22, 2010 at 10:39:01PM +0900, Hitoshi Mitake wrote:
> > Adding new subcommand "perf lock" to perf.
> > 
> 
> looks like a really intresting patch! Does this patch mean that we can
> potentially remove CONFIG_LOCK_STAT, now that the functionality is
> available via 'perf'? Another desire for me has been to able to run
> lockstat on production box. This has not been possible before without
> incurring the performance penalty of lockdep. however, with 'perf' tools
> ability to be turned on an off, perhaps there is (or we can build) a
> mode for lockdep that is lower overhead for this usecase?

boot with: prove_locking=0

This patch still needs all the hooks and bits from lockdep, no way you
want all that in a prodction kernel.

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