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From: Dario Faggioli <dario.faggioli@citrix.com> Starting from Xen 4.2, libxl has all the bits and pieces in place for retrieving an adequate amount of information about the host NUMA topology. It is therefore possible, after a bit of shuffling, to arrange those information in the way libvirt wants to present them to the outside world. Therefore, with this patch, the <topology> section of the host capabilities is properly populated, when running on Xen, so that we can figure out whether or not we're running on a NUMA host, and what its characteristics are. [raistlin@Zhaman ~]$ sudo virsh --connect xen:/// capabilities <capabilities> <host> <cpu> .... <topology> <cells num='2'> <cell id='0'> <memory unit='KiB'>6291456</memory> <cpus num='8'> <cpu id='0' socket_id='1' core_id='0' siblings='0-1'/> <cpu id='1' socket_id='1' core_id='0' siblings='0-1'/> <cpu id='2' socket_id='1' core_id='1' siblings='2-3'/> <cpu id='3' socket_id='1' core_id='1' siblings='2-3'/> <cpu id='4' socket_id='1' core_id='9' siblings='4-5'/> <cpu id='5' socket_id='1' core_id='9' siblings='4-5'/> <cpu id='6' socket_id='1' core_id='10' siblings='6-7'/> <cpu id='7' socket_id='1' core_id='10' siblings='6-7'/> </cpus> </cell> <cell id='1'> <memory unit='KiB'>6881280</memory> <cpus num='8'> <cpu id='8' socket_id='0' core_id='0' siblings='8-9'/> <cpu id='9' socket_id='0' core_id='0' siblings='8-9'/> <cpu id='10' socket_id='0' core_id='1' siblings='10-11'/> <cpu id='11' socket_id='0' core_id='1' siblings='10-11'/> <cpu id='12' socket_id='0' core_id='9' siblings='12-13'/> <cpu id='13' socket_id='0' core_id='9' siblings='12-13'/> <cpu id='14' socket_id='0' core_id='10' siblings='14-15'/> <cpu id='15' socket_id='0' core_id='10' siblings='14-15'/> </cpus> </cell> </cells> </topology> </host> ....
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>