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numa: move source of default CPUs to NUMA node mapping into boards

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Originally CPU threads were by default assigned in
round-robin fashion. However it was causing issues in
guest since CPU threads from the same socket/core could
be placed on different NUMA nodes.
Commit fb43b73b (pc: fix default VCPU to NUMA node mapping)
fixed it by grouping threads within a socket on the same node
introducing cpu_index_to_socket_id() callback and commit
20bb648d (spapr: Fix default NUMA node allocation for threads)
reused callback to fix similar issues for SPAPR machine
even though socket doesn't make much sense there.

As result QEMU ended up having 3 default distribution rules
used by 3 targets /virt-arm, spapr, pc/.

In effort of moving NUMA mapping for CPUs into possible_cpus,
generalize default mapping in numa.c by making boards decide
on default mapping and let them explicitly tell generic
numa code to which node a CPU thread belongs to by replacing
cpu_index_to_socket_id() with @cpu_index_to_instance_props()
which provides default node_id assigned by board to specified
cpu_index.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <1494415802-227633-2-git-send-email-imammedo@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Igor Mammedov 2017-05-10 13:29:45 +02:00 • committed by Eduardo Habkost
parent d9c34f9c6c
commit ea089eebbd
7 changed files with 75 additions and 32 deletions
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2
include/sysemu/numa.h
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@ -26,7 +26,7 @@ struct node_info {
};
extern NodeInfo numa_info[MAX_NODES];
void parse_numa_opts(MachineClass *mc);
void parse_numa_opts(MachineState *ms);
void numa_post_machine_init(void);
void query_numa_node_mem(uint64_t node_mem[]);
extern QemuOptsList qemu_numa_opts;