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

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Message-ID: <1265015720.24455.101.camel@laptop>
Date:	Mon, 01 Feb 2010 10:15:20 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Jens Axboe <jens.axboe@...cle.com>,
	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 Sun, 2010-01-31 at 22:07 +0100, Frederic Weisbecker wrote:
> 
> - We are using the -M option from perf tools which multiplexes every
>   event buffers, which means every cpu commit their lock events in
>   the same buffer. Couple that with the two above reasons, it's supposed
>   to scale at worst.

Why are you doing that? That seems like asking for trouble.. 

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