Date: Tue, 23 Dec 2008 12:29:40 -0500 (EST)
From: Steven Rostedt <rostedt@goodmis.org>
To: Pekka Paalanen <pq@iki.fi>
cc: Ingo Molnar <mingo@elte.hu>,
       =?ISO-8859-15?Q?Fr=E9d=E9ric_Weisbecker?= <fweisbec@gmail.com>,
       Pekka J Enberg <penberg@cs.helsinki.fi>,
       LKML <linux-kernel@vger.kernel.org>,
       Markus Metzger <markus.t.metzger@gmail.com>
Subject: Re: ftrace behaviour (was: [PATCH] ftrace: introduce
 tracing_reset_online_cpus() helper)
In-Reply-To: <20081220033822.362bc88a@daedalus.pq.iki.fi>
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On Sat, 20 Dec 2008, Pekka Paalanen wrote:
> 
> I thought this was just about not having to do
> 
> $ echo 0 > tracing_enabled
> $ echo 28764243 > buffer_size
> $ echo 1 > tracing_enabled
> 
> and instead just do
> 
> $ echo 28764243 > buffer_size
> 
> which would do exactly the same, except being easier for the user.
> Personally I've never dreamed of any kind of resize-in-flight.
> 

I must be losing it :-p

You can on tip simply echo 28764243 > buffer_size without disabling the 
tracer.  This change is not in mainline, but I expect it will be in 
2.6.29. 

I just resized the buffer while running the function tracer. I made the 
change a while ago.

-- Steve

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