linux-kernel - Re: [PATCH][GIT PULL] ftrace: add kernel command line function filtering

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Date:	Thu, 28 May 2009 22:54:34 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Steven Rostedt <rostedt@...dmis.org>
cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH][GIT PULL] ftrace: add kernel command line function
 filtering

On Thu, 28 May 2009, Steven Rostedt wrote:
> ----
>  Documentation/kernel-parameters.txt |   17 ++++++++++++-
>  kernel/trace/ftrace.c               |   42 +++++++++++++++++++++++++++++++++++
>  2 files changed, 57 insertions(+), 2 deletions(-)
> ---------------------------
> commit 3481535dc7351d3a45f67d8016bd78fc5c537628
> Author: Steven Rostedt <srostedt@...hat.com>
> Date:   Thu May 28 13:37:24 2009 -0400
> 
>     ftrace: add kernel command line function filtering
>     
>     When using ftrace=function on the command line to trace functions
>     on boot up, one can not filter out functions that are commonly called.
>     
>     This patch adds two new ftrace command line commands.
>     
>       ftrace_notrace=function-list
>       ftrace_filter=function-list
>     
>     Where function-list is a comma separated list of functions to filter.
>     The ftrace_notrace will make the functions listed not be included
>     in the function tracing, and ftrace_filter will only trace the functions
>     listed.
>     
>     These two act the same as the debugfs/tracing/set_ftrace_notrace and
>     debugfs/tracing/set_ftrace_filter respectively.
>     
>     The simple glob expressions that are allowed by the filter files can also
>     be used by the command line interface.
>     
>     	ftrace_notrace=rcu*,*lock,*spin*
>     
>     Will not trace any function that starts with rcu, ends with lock, or has
>     the word spin in it.

 That's enough to filter out most of the annoyance during boot
     
>     Note, if the self tests are enabled, they may interfere with the filtering
>     set by the command lines.
>     
>     [ Imact: allow filtering of function tracing at boot up ]

 Is "Imact" an attempt to distract Linus ?

Thanks,

	tglx
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