From 57924bcd87cb03cc21ebd7efed880d16ca048dce Mon Sep 17 00:00:00 2001 From: Igor Mammedov Date: Thu, 19 Mar 2015 17:09:21 +0000 Subject: 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 Reviewed-by: Andreas Färber Signed-off-by: Eduardo Habkost --- include/hw/boards.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'include/hw') 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); }; /** -- cgit v1.2.3-55-g7522