Re: [Xen-devel] [PATCH RFC v2 5/7] libxl/vNUMA: VM config parsing functions

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Dario Faggioli writes ("Re: [Xen-devel] [PATCH RFC v2 5/7] libxl/vNUMA: VM 
config parsing functions"):
> On gio, 2013-10-10 at 12:25 -0400, Elena Ufimtseva wrote:
> > 3) if vdistance number of elements = vnodes * vnodes, take as it is.
> 
> Sure.

I have some qualms about this:

Aren't there some constraints that need to be imposed ?  For example,
distance[X,Y]==distance[Y,X] ?  What about the triangle inequality
(distance[A,B] + distance[B,C] >= distance[A,C]) ?

Do we really want/need to allow the specification of any arbitrary
distance matrix (subject perhaps to such constraints) ?

If we do need this I think the nested lists are probably a better
syntax for specifying the whole array.  That would also more easily
allow the user to specify only half of the symmetric matrix, and make
it syntactically clearer what's intended.

Ian.

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