[Libvir] Extending libvirt to probe NUMA topology

[Richard W.M. Jones]

Daniel P. Berrange wrote:
>  - Linux/Solaris Xen - hypercalls
>  - Linux non-Xen - libnuma  
>  - Solaris non-Xen -  liblgrp
> 
> The Xen & Linux modelling seems reasonably similar IIRC, but Solaris is
> a slightly different representational approach. 

The Solaris approach seems to be fully hierarchical as far as I can work 
out.

That seems to argue for extending the capabilities XML to describe 
nodes, in as much as the XML can start off as a flat list of NUMA nodes 
(for IBM) but later be made hierarchical if necessary.

> Yes that is correct. We should not change the default - let the OS appply
> whatever policy it sees fit by default, since over time OS are tending
> towards being able to automagically determine & apply NUMA policy.

Or add another domain creation call which allows passing an additional 
set of hints.  One of the hints would be initial cpu pinning.

Rich.

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