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numa: introduce machine callback for VCPU to node mapping

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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>
This commit is contained in:
Igor Mammedov 2015-03-19 17:09:21 +00:00 • committed by Eduardo Habkost
parent 3ef7197505
commit 57924bcd87
4 changed files with 21 additions and 7 deletions
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5
include/hw/boards.h
View file

@ -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);
};
/**

3
include/sysemu/numa.h
View file

@ -6,6 +6,7 @@
#include "qemu/option.h"
#include "sysemu/sysemu.h"
#include "sysemu/hostmem.h"
#include "hw/boards.h"
extern int nb_numa_nodes; /* Number of NUMA nodes */
@ -16,7 +17,7 @@ typedef struct node_info {
bool present;
} NodeInfo;
extern NodeInfo numa_info[MAX_NODES];
void parse_numa_opts(void);
void parse_numa_opts(MachineClass *mc);
void numa_post_machine_init(void);
void query_numa_node_mem(uint64_t node_mem[]);
extern QemuOptsList qemu_numa_opts;