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

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Message-ID: <029E5BE7F699594398CA44E3DDF5544401A80C36@swsmsx413.ger.corp.intel.com>
Date:	Tue, 1 Apr 2008 17:20:07 +0100
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: RE: [question] utrace user api / branch trace support

>-----Original Message-----
>From: Metzger, Markus T 
>Sent: Freitag, 28. März 2008 14:45
>To: 'Ingo Molnar'; 'roland@...hat.com'

Resend...


>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Maybe these articles are outdated and there is meanwhile a 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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