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

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Message-Id: <1239736986.22720.266.camel@laptop>
Date:	Tue, 14 Apr 2009 21:23:06 +0200
From:	Peter Zijlstra <peterz@...radead.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>,
	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, 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.

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