linux-kernel - [question] utrace user api / branch trace support

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Message-ID: <029E5BE7F699594398CA44E3DDF5544401A0699D@swsmsx413.ger.corp.intel.com>
Date:	Fri, 28 Mar 2008 13:44:34 -0000
From:	"Metzger, Markus T" <markus.t.metzger@...el.com>
To:	"Ingo Molnar" <mingo@...e.hu>, <roland@...hat.com>
Cc:	<ak@...e.de>, <hpa@...or.com>, <linux-kernel@...r.kernel.org>,
	<tglx@...utronix.de>, <markus.t.metzger@...il.com>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	<akpm@...ux-foundation.org>, <mtk.manpages@...il.com>,
	<eranian@...glemail.com>,
	"Villacis, Juan" <juan.villacis@...el.com>
Subject: [question] utrace user api / branch trace support

Ingo, Roland,

I started looking into utrace. I found something at
.../git/frob/utrace.git.

When I google for utrace, I find articles at lwn.net. One of them
(http://lwn.net/Articles/224772/) says "The core utrace code does not
interface with user space at all; instead, it is an in-kernel API ....".

That same article further says "Utrace replaces ptrace() entirely, while
maintaining the same interface to user space".

I fail to understand the relation to Roland's comments that he does not
want further ptrace user API extensions. 

Maybe these articles are outdated and there is meanwhile a utrace user
API. Would you please point me to some documentation on how application
debuggers will use utrace?

thanks and regards,
markus.
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