linux-kernel - Re: [PATCH 5/8] tracing/events: move the ftrace event tracing code to core

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Date:	Tue, 14 Apr 2009 22:25:57 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Theodore Tso <tytso@....edu>,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@....de>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	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>
Subject: Re: [PATCH 5/8] tracing/events: move the ftrace event tracing code
 to core


On Tue, 14 Apr 2009, Peter Zijlstra wrote:

> On Tue, 2009-04-14 at 13:23 -0400, Steven Rostedt wrote:
> > + * static struct trace_event ftrace_event_type_<call> = {
> > + *     .trace                  = ftrace_raw_output_<call>, <-- stage 2
> > + * };
> 
> > + * static struct ftrace_event_call __used
> > + * __attribute__((__aligned__(4)))
> > + * __attribute__((section("_ftrace_events"))) event_<call> = {
> > + *     .name                   = "<call>",
> > + *     .system                 = "<system>",
> > + *     .raw_init               = ftrace_raw_init_event_<call>,
> > + *     .regfunc                = ftrace_reg_event_<call>,
> > + *     .unregfunc              = ftrace_unreg_event_<call>,
> > + *     .show_format            = ftrace_format_<call>,
> > + * }
> 
> Is there a good reason these are two different structs?
> 
> I've always wondered about that, it seems natural to unify them and to
> generalize the reverse lookup hash that is now private to trace_output.
> 
> The trace_event_profile code could use that reverse lookup, that linear
> search it currently does it really lame.

Hmm, I'll have to look at that. Of course that means touching these crazy 
macros again ;-)

-- Steve

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