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Date:	Mon, 26 Oct 2009 09:29:52 -0400
From:	Steven Rostedt <>
To:	Pierre-Marc Fournier <>
Cc:	Ingo Molnar <>, GeunSik Lim <>,
	Zhaolei <>,
	Wu Fengguang <>,
	Jesper Juhl <>,
	Mathieu Desnoyers <>,
	Adrian Bunk <>,
	Harvey Harrison <>,
	"Robert P. J. Day" <>,
	Jaswinder Singh Rajput <>,
	Frederic Weisbecker <>,
	Lai Jiangshan <>,
	KOSAKI Motohiro <>,,
	Dominique Toupin <>,
	Michel Dagenais <>
Subject: Re: Relicensing tracepoints and markers to Dual LGPL v2.1/GPL
 v2,headers to Dual BSD/GPL

On Mon, 2009-10-26 at 09:17 -0400, Pierre-Marc Fournier wrote:
> Ingo Molnar wrote:
> > 
> > But i also disagree with it on a technical level: code duplication is 
> > _bad_. Why does the code have to be duplicated in user-space like that? 
> > I'd like Linux tracing code to be in the kernel repo. Why isnt this done 
> > properly, as part of the kernel project - to make sure it all stays in 
> > sync?
> > 
> If you mean that this code should solely be used inside the kernel, then
> what you propose technically does not work. There is a very high cost to
> accessing kernel code from userspace. This cost is simply unacceptable
> for the kind of userspace tracing that is needed today.

I think that Ingo is thinking that the tracing is for the kernel, and is
asking why the duplication needs to be done for tools tracing the

But what I think is trying to be done here is to use the same types of
MACROS that we have in the kernel to do tracing in userspace. That a
userspace program can add their own "TRACE_EVENT" and that the headers
there will create a tracepoint for them the same way we currently do in
the kernel.

Am I correct in my analysis?

-- Steve

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