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It turns out that calling virNodeGetCPUMap(conn, NULL, NULL, 0) is both useful, and with Viktor's patches, common enough to optimize. Since this interface hasn't been released yet, we can change the RPC call. A bit more background on the optimization - learning the cpu count is a single file read (/sys/devices/system/cpu/possible), but learning the number of online cpus can possibly trigger a file read per cpu, depending on the age of the kernel, and all wasted if the caller passed NULL for both arguments. * src/nodeinfo.c (nodeGetCPUMap): Avoid bitmap when not needed. * src/remote/remote_protocol.x (remote_node_get_cpu_map_args): Supply two separate flags for needed arguments. * src/remote/remote_driver.c (remoteNodeGetCPUMap): Update caller. * daemon/remote.c (remoteDispatchNodeGetCPUMap): Likewise. * src/remote_protocol-structs: Regenerate.
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>