linux-kernel - Re: [patch] trace: Add user-space event tracing/injection

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Message-ID: <20101117133321.GF5464@nowhere>
Date:	Wed, 17 Nov 2010 14:33:25 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Pekka Enberg <penberg@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Darren Hart <dvhart@...ux.intel.com>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [patch] trace: Add user-space event tracing/injection

On Wed, Nov 17, 2010 at 02:31:27PM +0100, Peter Zijlstra wrote:
> On Wed, 2010-11-17 at 14:10 +0100, Frederic Weisbecker wrote:
> > 
> > 
> > 
> > Why not using write() on the perf event fd?
> > So that you don't only limit to a custom new simple event (which should
> > match most needs) but you can also inject whatever existing event you like.
> 
> Because you don't have the perf event fd, the monitoring application has
> it.


Ah, right.

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