linux-kernel - Re: [PATCH][RESEND] ftrace: Add a script to produce a hierarchical view of a function trace

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Message-ID: <c62985530810261626r2b80a1ebne7d26fa71b3c364c@mail.gmail.com>
Date:	Mon, 27 Oct 2008 00:26:31 +0100
From:	"Frédéric Weisbecker" <fweisbec@...il.com>
To:	"Steven Rostedt" <rostedt@...dmis.org>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Linux Kernel" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][RESEND] ftrace: Add a script to produce a hierarchical view of a function trace

2008/10/27 Steven Rostedt <rostedt@...dmis.org>:
>
>
> On Sun, 26 Oct 2008, Frederic Weisbecker wrote:
>
>> This script parses a function trace and then produces a hierarchical view of the
>> function call stack after processing it into a tree.
>>
>> You can see the result on attachment. You will find the raw trace and the hierarchical view.
>
> Very nice and useful tool!
>
> Just one thing...
>
>>
>> Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
>> ---
>> diff --git a/scripts/draw_functrace.py b/scripts/draw_functrace.py
>> new file mode 100755
>> index 0000000..e6496bd
>> --- /dev/null
>> +++ b/scripts/draw_functrace.py
>> @@ -0,0 +1,119 @@
>> +#!/usr/bin/python
>> +
>> +"""
>> +Copyright 2008 (c) Frederic Weisbecker <fweisbec@...il.com>
>> +Licensed under the terms of the GNU GPL License version 2
>> +
>> +This script parses a trace provided by the function tracer in
>> +kernel/trace/trace_functions.c
>> +The resulted trace is processed into a tree to produce a more human
>> +view of the call stack by drawing textual but hierarchical tree of
>> +calls. Only the functions's names and the the call time are provided.
>> +
>> +Usage:
>> +     Be sure that you have CONFIG_FUNCTION_TRACER
>> +     # mkdir /debugfs
>> +     # mount -t debug debug /debug
>> +     # echo function > /debug/tracing/current_tracer
>> +     # cat /debug/tracing/current_tracer > ~/raw_trace_func
>
> Do you really mean to write "function" into ~/raw_trace_func?


Oops. No I wanted to write

cat /debug/tracing/trace_pipe > ~/raw_trace_func

> Also, I just tried this out (replacing current_tracer with trace) and I
> just get ---Root (Nowhere)

Really? Could you send me your trace? Perhaps a problem with the
regular expression.
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