linux-kernel - Re: [PATCH 2/8] tracing: create automated trace defines

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Date:	Wed, 15 Apr 2009 19:56:54 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
CC:	Steven Rostedt <rostedt@...dmis.org>, 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>,
	Theodore Tso <tytso@....edu>,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@....de>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Zhaolei <zhaolei@...fujitsu.com>, Li Zefan <lizf@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	"Frank Ch. Eigler" <fche@...stic.org>,
	Tom Zanussi <tzanussi@...il.com>,
	Jiaying Zhang <jiayingz@...gle.com>,
	Michael Rubin <mrubin@...gle.com>,
	Martin Bligh <mbligh@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Neil Horman <nhorman@...driver.com>,
	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [PATCH 2/8] tracing: create automated trace defines

Mathieu Desnoyers wrote:
> Is your only problem the fact that tracepoints include rcupdate.h ?

No.  That was the first roadblock, which caused massive cyclic 
dependencies between includes and consequent failure to define 
everything required.  I solved that by pushing __DO_TRACE out of line.  
Everything since then is a separate issue.

>  This
> can easily be solved by moving rcu_read_(un)lock_sched_notrace to a
> rcu-update-<insert meaningful name here> and include this header in
> rcupdate.h and tracepoint.h.
>   
I suppose, but I think pushing __do_trace_##name out of line is cleaner 
anyway.  And I think it's very important that tracepoint.h have a 
*absolutely minimal* #include set, so that it can be safely included in 
as many contexts as possible.  asm/paravirt.h is complex enough as it 
is, and I really don't want tracepoint bringing in any extra headers at 
all.  linux/types.h is about the only acceptable one.

> If by doing these modifications we succeed in keeping the "void"
> parameters working _and_ make your stuff to compile, I think we would
> have done something great. :-)
>   

The void issue is irritating, but relatively minor compared to the 
rest.  If everything else gets solved except for the need to pass a 
dummy param to no-arg tracepoints, then I think it'll be a generally 
useful facility.

    J
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