linux-kernel - Re: [PATCH 01/10][RFC] tracing: Create class struct for events

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Message-ID: <20100428202225.GB8591@Krystal>
Date:	Wed, 28 Apr 2010 16:22:25 -0400
From:	Mathieu Desnoyers <compudj@...stal.dyndns.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>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Christoph Hellwig <hch@....de>
Subject: Re: [PATCH 01/10][RFC] tracing: Create class struct for events

* Steven Rostedt (rostedt@...dmis.org) wrote:
> From: Steven Rostedt <srostedt@...hat.com>
> 
> This patch creates a ftrace_event_class struct that event structs point to.
> This class struct will be made to hold information to modify the
> events. Currently the class struct only holds the events system name.
> 
> This patch slightly increases the size of the text as well as decreases
> the data size. The overall change is still a slight increase, but
> this change lays the ground work of other changes to make the footprint
> of tracepoints smaller.
> 
> With 82 standard tracepoints, and 616 system call tracepoints:
> 
>    text	   data	    bss	    dec	    hex	filename
> 5788186	1337252	9351592	16477030	 fb6b66	vmlinux.orig
> 5792282	1333796	9351592	16477670	 fb6de6	vmlinux.class
> 
> Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> ---
>  include/linux/ftrace_event.h       |    6 +++++-
>  include/linux/syscalls.h           |    6 ++++--
>  include/trace/ftrace.h             |   36 +++++++++++++++---------------------
>  kernel/trace/trace_events.c        |   20 ++++++++++----------
>  kernel/trace/trace_events_filter.c |    6 +++---
>  kernel/trace/trace_export.c        |    6 +++++-
>  kernel/trace/trace_kprobe.c        |   12 ++++++------
>  kernel/trace/trace_syscalls.c      |    4 ++++
>  8 files changed, 52 insertions(+), 44 deletions(-)
> 
[...]
> diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
> index 75dd778..0921a8f 100644
> --- a/include/trace/ftrace.h
> +++ b/include/trace/ftrace.h
> @@ -62,7 +62,10 @@
>  		struct trace_entry	ent;				\
>  		tstruct							\
>  		char			__data[0];			\
> -	};
> +	};								\
> +									\
> +	static struct ftrace_event_class event_class_##name;
> +
>  #undef DEFINE_EVENT
>  #define DEFINE_EVENT(template, name, proto, args)	\
>  	static struct ftrace_event_call			\
> @@ -430,22 +433,6 @@ perf_trace_disable_##name(struct ftrace_event_call *unused)		\
>   *
>   * Override the macros in <trace/trace_events.h> to include the following:
>   *
> - * static void ftrace_event_<call>(proto)
> - * {
> - *	event_trace_printk(_RET_IP_, "<call>: " <fmt>);
> - * }
> - *
> - * static int ftrace_reg_event_<call>(struct ftrace_event_call *unused)
> - * {
> - *	return register_trace_<call>(ftrace_event_<call>);
> - * }
> - *
> - * static void ftrace_unreg_event_<call>(struct ftrace_event_call *unused)
> - * {
> - *	unregister_trace_<call>(ftrace_event_<call>);
> - * }
> - *
> - *
>   * For those macros defined with TRACE_EVENT:
>   *
>   * static struct ftrace_event_call event_<call>;

So.. just wondering, why are you removing these comments ? What's
replacing them ?

Maybe you meant to remove this in a following patch ?

Thanks,

Mathieu


-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
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