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

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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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