linux-kernel - Re: [PATCH] tracing/function-graph-tracer: adjustments of the trace informations

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Date:	Fri, 28 Nov 2008 10:25:53 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Tim Bird <tim.bird@...sony.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tracing/function-graph-tracer: adjustments of the
	trace informations


another thing which i'm sure you are aware of:

# tracer: function_graph
#
#           TASK-PID    CPU#    TIMESTAMP  FUNCTION
#              | |       |          |         |
 ------------------------------------------
 | 1)  S99local--1  =>  ssh-1724
 ------------------------------------------
 
 1)      0.867 us |        }
 1)               |        mark_page_accessed() {
 1)      0.293 us |          constant_test_bit();
 1)      0.294 us |          constant_test_bit();
[...]

the header description is now out of of sync :-)

Also, we should probably not start the trace with a PID-switch event. 
the last_pid[] markers are probably out of sync when we start printing 
the trace.

So the output should probably be something like:

# tracer: function_graph
#
# CPU      COST     FUNCTION-GRAPH
# |          |       |        

 1)      0.867 us |        }
 1)               |        mark_page_accessed() {
 1)      0.293 us |          constant_test_bit();
 1)      0.294 us |          constant_test_bit();
[...]

	Ingo
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