linux-kernel - Re: trace/events: DECLARE vs DEFINE semantic

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Date:	Wed, 2 Dec 2009 17:57:36 -0500
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Masami Hiramatsu <mhiramat@...hat.com>, akpm@...ux-foundation.org,
	Ingo Molnar <mingo@...e.hu>, mingo@...hat.com, hpa@...or.com,
	linux-kernel@...r.kernel.org, randy.dunlap@...cle.com,
	wcohen@...hat.com, fweisbec@...il.com, tglx@...utronix.de,
	jbaron@...hat.com, linux-tip-commits@...r.kernel.org,
	Christoph Hellwig <hch@....de>
Subject: Re: trace/events: DECLARE vs DEFINE semantic

* Steven Rostedt (rostedt@...dmis.org) wrote:
> On Wed, 2009-12-02 at 17:36 -0500, Masami Hiramatsu wrote:
> 
> > > Or do you (or anyone else) have a better name?
> > 
> > How about renaming DEFINE_EVENT to TRACE_EVENT_CLASS?
> > 
> > DECLARE_EVENT_CLASS(y, ...)	declare an event-class y
> > TRACE_EVENT_CLASS(x, y, ...)	define/declare a trace event x from event-class y
> > TRACE_EVENT(x, ...)		define/declare a trace event x
> > 
> > Thus TRACE_EVENT_* implies that this macro will be expanded
> > to both of definition and declaration.
> > I don't think separating it is good idea from the viewpoint
> > of maintaining code.
> 
> Hmm, what about just:
> 
> TRACE_CLASS - Declares a class
> TRACE_CLASS_EVENT - defines an event for said class
> TRACE_EVENT - Declares a class and defines an event (as is today)

Yep, it looks good! It's self-descriptive and don't require to explain
what the thing is doing each time we refer to it. (however I feel a bit
sad for Fred, Wilma and Barney) ;)

For that semantic, you have my

Acked-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>

Thanks,

Mathieu

> 
> -- Steve
> 
> 

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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