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

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Message-ID: <20090218140150.GA31620@elte.hu>
Date:	Wed, 18 Feb 2009 15:01:50 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Frederic Weisbecker <fweisbec@...il.com>
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


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.

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

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

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

Hm?

	Ingo
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