Re: [RFC] Unify KVM kernel-space and user-space code into a singleproject

[Antoine Martin]

On 03/23/2010 02:54 AM, Ingo Molnar wrote:
> * Alexander Graf<agraf@xxxxxxx>  wrote
> > Yes. I think the point was that every layer in between brings potential
> > slowdown and loss of features.
> >      
> Exactly. The more 'fragmented' a project is into sub-projects, without a
> single, unified, functional reference implementation in the center of it, the
> longer it takes to fix 'unsexy' problems like trivial usability bugs.
>
> Furthermore, another negative effect is that many times features are
> implemented not in their technically best way, but in a way to keep them local
> to the project that originates them. This is done to keep deployment latencies
> and general contribution overhead down to a minimum. The moment you have to
> work with yet another project, the overhead adds up.
>
> So developers rather go for the quicker (yet inferior) hack within the
> sub-project they have best access to.
>
> Tell me this isnt happening in this space ;-)
>    
Integration is hard, requires a wider set of technical skills and 
getting good test coverage becomes more difficult.
But I agree that it is worth the effort, kvm could reap large rewards 
from putting a greater emphasis on integration (ala vbox) - no matter 
how it is achieved (cowardly not taking sides on implementation 
decisions like repository locations).

Antoine

> Thanks,
>
> 	Ingo
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