linux-kernel - Re: [PATCH 0/5] Optimize perf ring-buffer

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Date:	Wed, 19 May 2010 09:14:10 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/5] Optimize perf ring-buffer

On Tue, May 18, 2010 at 03:32:58PM +0200, Peter Zijlstra wrote:
> This patch-set optimizes the perf ring-buffer by removing IRQ disable and 
> all LOCK ops from the fast paths.
> 
> There's also an RFC patch that adds perf_output_addr() which will allow
> you to write directly to the buffer, however I'm not sure how to go
> about using it for the trace events since we need to multiplex event --
> there is no single copy of the actual event.


What do you mean by the fact we need to multiplex event?

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