linux-kernel - Re: [PATCH 03/10][RFC] tracing: Convert TRACE_EVENT() to use the DECLARE_TRACE

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Date:	Wed, 28 Apr 2010 20:03:57 -0400
From:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Christoph Hellwig <hch@....de>
Subject: Re: [PATCH 03/10][RFC] tracing: Convert TRACE_EVENT() to use the
	DECLARE_TRACE_DATA()

* Steven Rostedt (rostedt@...dmis.org) wrote:
> On Wed, 2010-04-28 at 16:39 -0400, Mathieu Desnoyers wrote:
> > * Steven Rostedt (rostedt@...dmis.org) wrote:
> > > From: Steven Rostedt <srostedt@...hat.com>
> > > 
> > > Switch the TRACE_EVENT() macros to use DECLARE_TRACE_DATA(). This
> > > patch is done to prove that the DATA macros work. If any regressions
> > > were to surface, then this patch would help a git bisect to localize
> > > the area.
> > > 
> > > Once again this patch increases the size of the kernel.
> > > 
> > 
> > As recommended in the earlier email:
> > 
> > It would make sense to just add the extra "callback_data" argument
> > directly to DECLARE_TRACE(), modify the user (TRACE_EVENT) accordingly.
> > And possibly create a TRACE_EVENT_NOARG() variant.
> 
> Are you suggesting to make DECLARE_TRACE() be...
> 
> #define DECLARE_TRACE(name, proto, args, data)
> 
> ?

err.. forget about that. We only need to modify the callback to take the
extra argument into acount, not DECLARE_TRACE().

Thanks,

Mathieu

> 
> -- Steve
> 
> 

-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
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