linux-kernel - Re: [PATCH] ftrace: Documentation

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Message-ID: <863e9df20807120549r793c93c3o4c6049bed8670149@mail.gmail.com>
Date:	Sat, 12 Jul 2008 18:19:03 +0530
From:	"Abhishek Sagar" <sagar.abhishek@...il.com>
To:	"Steven Rostedt" <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, "Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Peter Zijlstra" <peterz@...radead.org>,
	"Clark Williams" <clark.williams@...il.com>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Randy Dunlap" <randy.dunlap@...cle.com>,
	"Jon Masters" <jonathan@...masters.org>
Subject: Re: [PATCH] ftrace: Documentation

On Thu, Jul 10, 2008 at 10:16 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
>
> This is the long awaited ftrace.txt. It explains in quite detail how to
> use ftrace and the various tracers.

This is quite good. Thanks!

> +Output format:
> +--------------
> +
> +Here's an example of the output format of the file "trace"
> +
> +                             --------
> +# tracer: ftrace
> +#
> +#           TASK-PID   CPU#    TIMESTAMP  FUNCTION
> +#              | |      |          |         |
> +            bash-4251  [01] 10152.583854: path_put <-path_walk
> +            bash-4251  [01] 10152.583855: dput <-path_put
> +            bash-4251  [01] 10152.583855: _atomic_dec_and_lock <-dput
> +                             --------

A small caveat here...the function names may be substituted with a
"[unkown/kretprobe'd]" under special circumstances
(http://lkml.org/lkml/2008/5/27/275). May be that should be mentioned
here?

--
Regards,
Abhishek
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