Subject: Re: [patch] trace: Add user-space event tracing/injection
From: Peter Zijlstra <peterz@infradead.org>
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>, Pekka Enberg <penberg@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Steven Rostedt <rostedt@goodmis.org>,
        Arjan van de Ven <arjan@linux.intel.com>,
        Arnaldo Carvalho de Melo <acme@redhat.com>,
        linux-kernel@vger.kernel.org,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Darren Hart <dvhart@linux.intel.com>,
        Arjan van de Ven <arjan@infradead.org>
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Date: Wed, 17 Nov 2010 14:31:27 +0100
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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.
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