Date: Sat, 21 Mar 2009 17:44:31 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Renzo Davoli <renzo@cs.unibo.it>
Cc: Andrew Morton <akpm@linux-foundation.org>,
       Roland McGrath <roland@redhat.com>, utrace-devel@redhat.com,
       linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/3] utrace core
Message-ID: <20090321164431.GK11183@elte.hu>
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* Renzo Davoli <renzo@cs.unibo.it> wrote:

> On Sat, Mar 21, 2009 at 03:34:57PM +0100, Ingo Molnar wrote:
> > 
> > * Renzo Davoli <renzo@cs.unibo.it> wrote:
> > 
> > > Tracing does not mean only debug. Some tracing facilities can be 
> > > used for virtualization. For example User-Mode Linux is based on 
> > > ptrace.
> > > 
> > > I have a prototype of kernel module for virtualization (kmview) 
> > > based on utrace. [...]
> > 
> > Hm, i cannot find the source code. Can it be downloaded from 
> > somewhere?
>
> Sure! kmview is not included in our Debian packages yet as it 
> relies on (still) non mainstream features (utrace), but the code 
> is available on our view-os svn repository.
> 
> Check out:
> svn co https://view-os.svn.sourceforge.net/svnroot/view-os view-os 
> 
> More specifically to browse the code/specifications:
> The kmview device protocol is here:
> http://wiki.virtualsquare.org/index.php/KMview_module_interface_specifications
> The kernel module itself is here:
> http://view-os.svn.sourceforge.net/viewvc/view-os/trunk/kmview-kernel-module/

Looks really interesting.

That's btw. what i see as the biggest value of utrace: it's a 
comprehesive, all-encompassing framework all around process state 
events and process state manipulation.

Utrace came from Frysk (generic debugger), but the fact that you 
were able to build a completely unanticipated usecase and 
virtualization module on top of it is a very good sign of a robust 
and complete design. I'm impressed.

	Ingo
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