linux-kernel - Re: [PATCH] ftrace: introduce tracing_reset_online

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Message-ID: <alpine.DEB.1.10.0812191216190.26432@gandalf.stny.rr.com>
Date:	Fri, 19 Dec 2008 12:20:18 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frédéric Weisbecker <fweisbec@...il.com>
cc:	Pekka J Enberg <penberg@...helsinki.fi>, mingo@...e.hu,
	linux-kernel@...r.kernel.org, Pekka Paalanen <pq@....fi>,
	Markus Metzger <markus.t.metzger@...il.com>
Subject: Re: [PATCH] ftrace: introduce tracing_reset_online_cpus() helper


On Fri, 19 Dec 2008, Fr?d?ric Weisbecker wrote:
> 
> 
> That's looks good.
> By the past, I also suggested Steven to automatically reset the traces
> buffer each time a tracer is started, that
> would factor out the code a bit more. I don't think one tracer would
> avoid to reset the buffer once it is started, and
> I don't think it is needed to reset twice on tracer switching: on stop
> of the old tracer and on start on the new. Only
> on start should be enough.

I'm actually against the idea of reseting a trace everytime we enable it.
That is:

echo 1 > /debug/tracing/tracing_enabled

This should not reset the tracer. I actually do tracing where I disable 
and enable it around areas I am interested in. I want all tracing, not 
just the last one.

Now we have recently added /debug/tracing/tracing_on which can quickly 
stop tracing. I may be able to use that, and we can let the 
tracing_enable" reset it too.

I'll have to take a look at my scripts to see if that would work.

-- Steve


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