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Date: Wed, 19 May 2010 09:58:06 +0200
From: Frederic Weisbecker <fweisbec@gmail.com>
To: mingo@redhat.com, hpa@zytor.com, paulus@samba.org, acme@redhat.com,
       linux-kernel@vger.kernel.org, a.p.zijlstra@chello.nl, efault@gmx.de,
       rostedt@goodmis.org, tglx@linutronix.de, mingo@elte.hu
Cc: linux-tip-commits@vger.kernel.org
Subject: Re: [tip:perf/core] perf/ftrace: Optimize perf/tracepoint
	interaction for single events
Message-ID: <20100519075804.GF5704@nowhere>
References: <tip-4f41c013f553957765902fb01475972f0af3e8e7@git.kernel.org>
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On Tue, May 18, 2010 at 05:15:42PM +0000, tip-bot for Peter Zijlstra wrote:
> Commit-ID:  4f41c013f553957765902fb01475972f0af3e8e7
> Gitweb:     http://git.kernel.org/tip/4f41c013f553957765902fb01475972f0af3e8e7
> Author:     Peter Zijlstra <a.p.zijlstra@chello.nl>
> AuthorDate: Tue, 18 May 2010 18:08:32 +0200
> Committer:  Ingo Molnar <mingo@elte.hu>
> CommitDate: Tue, 18 May 2010 18:35:46 +0200
> 
> perf/ftrace: Optimize perf/tracepoint interaction for single events
> 
> When we've got but a single event per tracepoint
> there is no reason to try and multiplex it so don't.
> 
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
> Tested-by: Ingo Molnar <mingo@elte.hu>
> Cc: Steven Rostedt <rostedt@goodmis.org>
> Cc: Frederic Weisbecker <fweisbec@gmail.com>
> Cc: Mike Galbraith <efault@gmx.de>
> Cc: Paul Mackerras <paulus@samba.org>
> Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
> LKML-Reference: <new-submission>
> Signed-off-by: Ingo Molnar <mingo@elte.hu>
> ---


I haven't seen this patch going.

But yeah that's a nice optimization for UP machines.