diff options
| author | Laurent Vivier <lvivier@redhat.com> | 2017-05-02 18:29:55 +0200 |
|---|---|---|
| committer | Eduardo Habkost <ehabkost@redhat.com> | 2017-05-11 16:08:47 -0300 |
| commit | 3bfe57165b4bf86a431099078df422f54598f5c6 (patch) | |
| tree | 268732cbb3c47f666250ab80d2bc2b7aa300d995 /include/hw/boards.h | |
| parent | 0f203430dd88cc6270310956ace58aca639edb59 (diff) | |
numa: equally distribute memory on nodes
When there are more nodes than available memory to put the minimum
allowed memory by node, all the memory is put on the last node.
This is because we put (ram_size / nb_numa_nodes) &
~((1 << mc->numa_mem_align_shift) - 1); on each node, and in this
case the value is 0. This is particularly true with pseries,
as the memory must be aligned to 256MB.
To avoid this problem, this patch uses an error diffusion algorithm [1]
to distribute equally the memory on nodes.
We introduce numa_auto_assign_ram() function in MachineClass
to keep compatibility between machine type versions.
The legacy function is used with pseries-2.9, pc-q35-2.9 and
pc-i440fx-2.9 (and previous), the new one with all others.
Example:
qemu-system-ppc64 -S -nographic -nodefaults -monitor stdio -m 1G -smp 8 \
-numa node -numa node -numa node \
-numa node -numa node -numa node
Before:
(qemu) info numa
6 nodes
node 0 cpus: 0 6
node 0 size: 0 MB
node 1 cpus: 1 7
node 1 size: 0 MB
node 2 cpus: 2
node 2 size: 0 MB
node 3 cpus: 3
node 3 size: 0 MB
node 4 cpus: 4
node 4 size: 0 MB
node 5 cpus: 5
node 5 size: 1024 MB
After:
(qemu) info numa
6 nodes
node 0 cpus: 0 6
node 0 size: 0 MB
node 1 cpus: 1 7
node 1 size: 256 MB
node 2 cpus: 2
node 2 size: 0 MB
node 3 cpus: 3
node 3 size: 256 MB
node 4 cpus: 4
node 4 size: 256 MB
node 5 cpus: 5
node 5 size: 256 MB
[1] https://en.wikipedia.org/wiki/Error_diffusion
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Message-Id: <20170502162955.1610-2-lvivier@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
[ehabkost: s/ram_size/size/ at numa_default_auto_assign_ram()]
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Diffstat (limited to 'include/hw/boards.h')
| -rw-r--r-- | include/hw/boards.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/hw/boards.h b/include/hw/boards.h index 31d9c72fb0..99458eb859 100644 --- a/include/hw/boards.h +++ b/include/hw/boards.h @@ -136,6 +136,8 @@ struct MachineClass { int minimum_page_bits; bool has_hotpluggable_cpus; int numa_mem_align_shift; + void (*numa_auto_assign_ram)(MachineClass *mc, NodeInfo *nodes, + int nb_nodes, ram_addr_t size); HotplugHandler *(*get_hotplug_handler)(MachineState *machine, DeviceState *dev); |