[question] utrace user api / branch trace support

[Metzger, Markus T]

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Maybe these articles are outdated and there is meanwhile a utrace user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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