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| author | Igor Mammedov <imammedo@redhat.com> | 2015-03-19 17:09:21 +0000 |
|---|---|---|
| committer | Eduardo Habkost <ehabkost@redhat.com> | 2015-03-19 16:12:09 -0300 |
| commit | 57924bcd87cb03cc21ebd7efed880d16ca048dce (patch) | |
| tree | 6c64141a2db6ef60b6445a204d633dbb7608063a /include/hw/boards.h | |
| parent | 3ef7197505e483e2f28c5fbd6ed54b4061221200 (diff) | |
| download | qemu-57924bcd87cb03cc21ebd7efed880d16ca048dce.tar.gz | |
numa: introduce machine callback for VCPU to node mapping
Current default round-robin way of distributing VCPUs among
NUMA nodes might be wrong in case on multi-core/threads
CPUs. Making guests confused wrt topology where cores from
the same socket are on different nodes.
Allow a machine to override default mapping by providing
MachineClass::cpu_index_to_socket_id()
callback which would allow it group VCPUs from a socket
on the same NUMA node.
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Diffstat (limited to 'include/hw/boards.h')
| -rw-r--r-- | include/hw/boards.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/hw/boards.h b/include/hw/boards.h index 1feea2b176..78838d13d4 100644 --- a/include/hw/boards.h +++ b/include/hw/boards.h @@ -82,6 +82,10 @@ bool machine_mem_merge(MachineState *machine); * of HotplugHandler object, which handles hotplug operation * for a given @dev. It may return NULL if @dev doesn't require * any actions to be performed by hotplug handler. + * @cpu_index_to_socket_id: + * used to provide @cpu_index to socket number mapping, allowing + * a machine to group CPU threads belonging to the same socket/package + * Returns: socket number given cpu_index belongs to. */ struct MachineClass { /*< private >*/ @@ -118,6 +122,7 @@ struct MachineClass { HotplugHandler *(*get_hotplug_handler)(MachineState *machine, DeviceState *dev); + unsigned (*cpu_index_to_socket_id)(unsigned cpu_index); }; /** |