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

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Message-ID: <c62985530811280558q562ec3afj8486fe494482b4e1@mail.gmail.com>
Date:	Fri, 28 Nov 2008 14:58:55 +0100
From:	"Frédéric Weisbecker" <fweisbec@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
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

2008/11/28 Ingo Molnar <mingo@...e.hu>:
>
> 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();
> [...]


Ok I will just have to update something in the open callback....
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