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

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Message-ID: <c62985530910120659s4b1f3cbfq2f6adccb16cf2c23@mail.gmail.com>
Date:	Mon, 12 Oct 2009 15:59:15 +0200
From:	Frédéric Weisbecker <fweisbec@...il.com>
To:	rostedt@...dmis.org
Cc:	Stefan Assmann <sassmann@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ftrace: add kernel command line graph function filtering

Le 12 octobre 2009 15:46, Steven Rostedt <rostedt@...dmis.org> a écrit :
> On Mon, 2009-10-12 at 11:09 +0200, Frédéric Weisbecker wrote:
>> 2009/10/12 Stefan Assmann <sassmann@...hat.com>:
>> > From 894e934e782ddaa33eb6d156d8326cdf479b5f62 Mon Sep 17 00:00:00 2001
>> > From: Stefan Assmann <sassmann@...hat.com>
>> > Date: Mon, 12 Oct 2009 09:11:47 +0200
>> > Subject: [PATCH] ftrace: add kernel command line graph function filtering
>> >
>> > Add a command line parameter to allow limiting the function graphs that
>> > are traced on boot up, when ftrace=function_graph is specified.
>> >
>> > This patch adds the following command line option:
>> > ftrace_graph_filter=function-list
>>
>>
>> If we use this parameter, we undoubtedly want to launch the function
>> graph tracer.
>> I'd then suggest to arm ftrace=function_graph automatically if we have
>> ftrace_graph_filter
>> set.
>>
>
> Actually, I disagree. I may just be lazy, and want to set up the
> function graph to a particular set of functions. It doesn't mean I want
> to run the function_graph tracer on boot up.
>
> This is the same reason I don't automatically set up ftrace=function
> when the filter and notrace functions are set.


No problem. I'll take the previous patch then, plus the kernel
parameter doc fix in the current one :-)
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