From: Frederic Weisbecker <fweisbec@gmail.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@elte.hu>, Paul Mackerras <paulus@samba.org>,
Arnaldo Carvalho de Melo <acme@infradead.org>,
Steven Rostedt <rostedt@goodmis.org>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/5] perf: Disallow mmap() on per-task inherited events
Date: Wed, 19 May 2010 09:19:08 +0200 [thread overview]
Message-ID: <20100519071906.GB5704@nowhere> (raw)
In-Reply-To: <20100518133725.885757039@chello.nl>
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@chello.nl>
> ---
That is a very good news.
next prev parent reply other threads:[~2010-05-19 7:19 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-18 13:32 [PATCH 0/5] Optimize perf ring-buffer Peter Zijlstra
2010-05-18 13:32 ` [PATCH 1/5] perf: Disallow mmap() on per-task inherited events Peter Zijlstra
2010-05-19 7:19 ` Frederic Weisbecker [this message]
2010-05-25 0:55 ` Paul Mackerras
2010-05-25 8:19 ` Peter Zijlstra
2010-05-18 13:33 ` [PATCH 2/5] perf: Remove IRQ-disable from the perf_output path Peter Zijlstra
2010-05-18 13:33 ` [PATCH 3/5] perf: Convert the perf output buffer to local_t Peter Zijlstra
2010-05-18 13:33 ` [PATCH 4/5] perf: Avoid local_xchg Peter Zijlstra
2010-05-18 13:33 ` [RFC PATCH 5/5] perf: Implement perf_output_addr() Peter Zijlstra
2010-05-18 14:09 ` Peter Zijlstra
2010-05-19 7:21 ` Frederic Weisbecker
2010-05-19 7:58 ` Peter Zijlstra
2010-05-19 9:03 ` Frederic Weisbecker
2010-05-19 14:47 ` Steven Rostedt
2010-05-19 15:05 ` Peter Zijlstra
2010-05-19 15:38 ` Steven Rostedt
2010-05-19 15:50 ` Peter Zijlstra
2010-05-19 16:08 ` Steven Rostedt
2010-05-19 16:15 ` Peter Zijlstra
2010-05-19 16:27 ` Steven Rostedt
2010-05-19 16:34 ` Peter Zijlstra
2010-05-19 7:14 ` [PATCH 0/5] Optimize perf ring-buffer Frederic Weisbecker
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