linux-kernel - Re: [tip:perf/core] perf/ftrace: Optimize perf/tracepoint interaction for single events

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Date:	Wed, 19 May 2010 11:12:28 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	mingo@...hat.com, hpa@...or.com, paulus@...ba.org, acme@...hat.com,
	linux-kernel@...r.kernel.org, efault@....de, rostedt@...dmis.org,
	tglx@...utronix.de, mingo@...e.hu,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perf/core] perf/ftrace: Optimize perf/tracepoint
 interaction for single events

On Wed, 2010-05-19 at 11:06 +0200, Frederic Weisbecker wrote:
> On Wed, May 19, 2010 at 10:58:45AM +0200, Peter Zijlstra wrote:
> > How about something like the below?
> > 
> > 
> > ---
> > Subject: perf, trace: Remove IRQ-disable from perf/tracepoint interaction
> > From: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> > Date: Wed May 19 10:52:27 CEST 2010
> > 
> > 
> > 
> > Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> > ---
> 
> 
> 
> Looks fine if we don't have nested irqs.

Well, I was thinking the per-context recursion thing would sort that
out. We can have 1 event per context in-flight.
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