[PATCH 0 of 3] Some small NUMA placement improvements

[Dario Faggioli <dario.faggioli@citrix.com>]

Hi everyone,

This series implements some small impovement in how NUMA is dealt at the libxl
and xl level that I had pending in one of my queues.

More specifically, it enables actually using node distances information during
automatic placement and it allows the users to ask for a minimum and a maximum
number of NUMA nodes they want the automaic placement to use.

A little bit less related to _automatic_ placement, it also enhances the syntax
of the "cpus=" config switch (as well as the one of the `xl vcpu-pin' command),
so that full nodes can be specified instead of just single CPUs.

This is all about, on one hand, keeping improving performances of the NUMA
placement mechanism and, on the other, starting to give users some knobs to
control it.

Comments appreciated, as usual. :-)

Thanks and Regards,
Dario

-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
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Dario Faggioli, Ph.D, http://retis.sssup.it/people/faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)