linux-kernel - Re: [PATCH 1/5] perf: Disallow mmap() on per-task inherited events

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Date:	Wed, 19 May 2010 09:19:08 +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 1/5] perf: Disallow mmap() on per-task inherited events

On Tue, May 18, 2010 at 03:32:59PM +0200, Peter Zijlstra wrote:
> Since we now have working per-task-per-cpu events for a while,
> disallow mmap() on per-task inherited events. Those things were
> a performance problem anyway, and doing away with it allows
> us to optimize the buffer somewhat by assuming there is only a single
> writer.
> 
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> ---



That is a very good news.

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