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

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Date:	Thu, 03 Dec 2009 08:54:53 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	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

On Thu, 2009-12-03 at 08:51 -0500, Masami Hiramatsu wrote:

> > Basically, we should have a:
> > 
> > kernel/sched_trace.c that includes the include/trace/events/sched.h and
> > does the define.
> > 
> > And the same goes for other trace points.
> 
> Hmm, I'd rather like to move it into kernel/events/ or something new
> sub directory, since those files will have just two lines (define and
> include).

I'm fine with a kernel/events dir.

> 
> >> e.g.
> >>
> >> @kernel/tracepoint.c
> >>  ...
> >>  #define CREATE_TRACE_POINTS
> >>  #include <trace/events/sched.h>
> >>  #include <trace/events/...>
> > 
> > We could do this for all that is defined in the include/trace/events.
> > 
> >>  ...
> >>
> >> @kernel/sched.c
> >>  ...
> >>  #include <trace/events/sched.h>	/* Just include events header */
> >>  ...
> >>
> >> @fs/ext4/super.c (no change, since it can be module)
> >>  ...
> >>  #define CREATE_TRACE_POINTS
> >>  #include <trace/events/ext4.h>
> > 
> > Perhaps we should move out anything in include/trace/events that is also
> > a module into its sub system?
> 
> Would you mean putting those headers in sub-system's directory?
> (e.g. fs/ext4/)
> In that case, a problem will happen when user want to hook those
> tracepoint from their module, because it is hard to find those
> local headers.

Why? Modules usually do have their own headers in their sub system.

OK, if a module keeps their headers global (include/linux) then sure
they can keep their tracepoint header in include/trace/events. But I
still think that the module CREATE_TRACE_POINTS code should be kept with
the module code itself (but in a small separate file).

-- Steve


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