RE: [Xen-devel] Modular Xen

["Guy Zana" <guy@xxxxxxxxxxxx>]

> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Mark Williamson
> Sent: Tuesday, January 16, 2007 6:56 PM
> To: xen-devel@xxxxxxxxxxxxxxxxxxx
> Cc: Keir Fraser; David Pilger
> Subject: Re: [Xen-devel] Modular Xen
> 
> > Hi Keir, I look at it from the perspective of extending instead of 
> > embeding... This way, Xen will be easily ported to any 
> environment, it 
> > will be much more easier to program extensions, etc...
> 
> Is this really the case, though?
> 
> Assuming we're not talking about dynamically loadable modules 
> here, there would seem to be a fairly limited gain in ease of 
> extension: Xen compiles
> *very* quickly already, sufficiently so that it's not 
> particularly significant compared to the time taken to reboot 
> your machine to test your changes.
>
> I wouldn't expect the ability to recompile a module 
> separately to make much difference to this...
> 

I don't think that compilation is the main issue discussed. Porting is a
good example where loadables modules are useful... assuming that not all
platforms support all of Xen features.
Keeping track of what happen in this list for a while and I can
definitely say that there is a "feature contention" around :)
A modular approach can be a great improvement IMHO.

-- Guy.

> There are circumstances where it might be nice to load 
> *something* into Xen at boot time though...  I think the ACM 
> / sHype work supports (or at least, supported at some stage) 
> loading policy data as a multiboot module.
> 
> Cheers,
> Mark
> 
> --
> Dave: Just a question. What use is a unicyle with no seat?  
> And no pedals!
> Mark: To answer a question with a question: What use is a skateboard?
> Dave: Skateboards have wheels.
> Mark: My wheel has a wheel!
> 
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