[Libvir] RFC PATCH - Initial NodeGetCellsFreeMemory patch

[Richard W.M. Jones]

Daniel Veillard wrote:
>> + * If maxCells == -1, the free memory will be summed across all cells and
>> + * returned in freeMems[0].
> 
>   Hum, that -1 handling is a bit surprizing, but apparently that's what 
> the Xen hypercall does. It's a bit convoluted as an API to get the full
> free memory on a Node, maybe this should be separated as a different API
> as people looking for this information may not think about looking at 
> NUMA special entry points. We don't have currently a simple API to
> get the free memory on a Node, maybe that should be added.

Having the separate semantics is necessary because it seems like this 
can be done in a single hypercall if the caller only needs to know the 
total free memory.

Rich.

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