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When domain XML contains any of the elements for setting up CPU scheduling parameters (period, quota, emulator_period, or emulator_quota) we need cpu cgroup to enforce the configuration. However, the existing code would just ignore silently such settings if either cgroups were not available at all cpu cgroup was not available. Moreover, APIs for manipulating CPU scheduler parameters were already failing if cpu cgroup was not available. This patch makes cpu cgroup mandatory for all domains that use CPU scheduling elements in their XML.
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>