linux-kernel - Re: [PATCH 02/11] tracing: Introduce TRACE_EVENT

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Date:	Thu, 11 Feb 2010 14:23:06 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Hitoshi Mitake <mitake@....info.waseda.ac.jp>,
	Li Zefan <lizf@...fujitsu.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [PATCH 02/11] tracing: Introduce TRACE_EVENT_INJECT

On Thu, 2010-02-11 at 19:57 +0100, Frederic Weisbecker wrote:
> On Wed, Feb 10, 2010 at 09:05:06AM -0500, Steven Rostedt wrote:

> > Looking back at where trace_lock_class_init() was placed, you don't need
> > a wrapper. But instead, why not just have perf hook directly into the
> > trace_lock_class_init trace point, and do its injection directly.
> > Instead of needing to add some hack to TRACE_EVENT()?
> 
> 
> We could. But we expect further events may need such catch-up by
> injection system. And ftrace will also need to perform this injection.
> 
> That's why I think something more generic would be more reasonable.
> 

Hmm, I'm a bit dense lately and still a bit confused.

Why is an injector needed exactly, and why would ftrace want one too?

-- Steve


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