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When the default cpuset or automatic numa placement is used libvirt would place the whole parent cgroup in the specified cpuset. This then disallowed to re-pin the vcpus to a different cpu. This patch pins only the vcpu threads to the default cpuset and thus allows to re-pin them later. The following config would fail to start: <domain type='kvm'> ... <vcpu placement='static' cpuset='0-1' current='2'>4</vcpu> <cputune> <vcpupin vcpu='0' cpuset='2-3'/> ... This is a regression since a39f69d2b.
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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>
Description
Libvirt provides a portable, long term stable C API for managing the
virtualization technologies provided by many operating systems. It
includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware
vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER
Hypervisor.
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