linux-kernel - Re: [RFC][PATCH 2/2] tracing/function-graph-tracer: provide documentation for the function graph tracer

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Message-ID: <20090218155827.GA5765@nowhere>
Date:	Wed, 18 Feb 2009 16:58:28 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 2/2] tracing/function-graph-tracer: provide
	documentation for the function graph tracer

On Wed, Feb 18, 2009 at 03:01:50PM +0100, Ingo Molnar wrote:
> 
> btw., a minor trace-output observation. We currently have this 
> default output:
> 
> # tracer: function_graph
> #
> # CPU  DURATION                  FUNCTION CALLS
> # |     |   |                     |   |   |   |
> 
>  0)               |  sys_open() {
>  0)               |    do_sys_open() {
>  0)               |      getname() {
>  0)               |        kmem_cache_alloc() {
>  0)   1.382 us    |          __might_sleep();
>  0)   2.478 us    |        }
> 
> Wouldnt this tweaked version look even nicer:
> 
> #
> # [ tracer: function_graph ]
> #
>  CPU)  <duration>   |  <function-name>
>  ..............................................
>    0)               |  sys_open() {
>    0)               |    do_sys_open() {
>    0)               |      getname() {
>    0)               |        kmem_cache_alloc() {
>    0)   1.382 us    |          __might_sleep();
>    0)   2.478 us    |        }
> 
> 
> Changes:
> 
>  1) Added an empty '#' line to the head. Looks nicer because 
>     the comment is now symmetric.

Right.
 
>  2) Shifted of the CPU field two positions to the left. Better 
>     for paste-ability and makes the 'CPU)' header fit as well.


Good.


>  3) Changed the field description in the header portion to a 
>     standard <field> notation.


I guess it's more a matter of taste here.
I like the uppercase titles because they draw a good separation between
titles and traces.


>  4) added the '....' line to create a table.


Yeah, seems better.


> Hm?
> 
> 	Ingo

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