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ccf80e3630
Instead of returning a CPUs list, numad returns NUMA node list instead, this patch is to convert the node list to cpumap before affinity setting. Otherwise, the domain processes will be pinned only to CPU[$numa_cell_num], which will cause significiant performance losses. Also because numad will balance the affinity dynamically, reflecting the cpuset from numad back doesn't make much sense then, and it may just could produce confusion for the users. Thus the better way is not to reflect it back to XML. And in this case, it's better to ignore the cpuset when parsing XML. The codes to update the cpuset is removed in this patch incidentally, and there will be a follow up patch to ignore the manually specified "cpuset" if "placement" is "auto", and document will be updated too.
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>