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Re: [Qemu-devel] [RFC PATCH 14/14] numa: add -numa node, memdev= option
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [RFC PATCH 14/14] numa: add -numa node, memdev= option |
Date: |
Wed, 11 Dec 2013 16:50:32 +0100 |
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Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130923 Thunderbird/17.0.9 |
Il 11/12/2013 16:36, Igor Mammedov ha scritto:
>> > -object memory-ram,size=1024M,policy=membind,host-nodes=0,id=ram-node0 \
>> > -numa node,nodeid=0,cpus=0,memdev=ram-node0 \
>> > -object
>> > memory-ram,size=1024M,policy=interleave,host-nodes=1-3,id=ram-node1 \
>> > -numa node,nodeid=1,cpus=1,memdev=ram-node1
>
> I was thinking about a bit more radical change:
> -object memory-ram,size=1024M,policy=membind,host-nodes=0,id=ram-node0
> -device dimm,memdev=ram-node0,node=0
> -object memory-ram,size=1024M,policy=membind,host-nodes=1,id=ram-node1
> -device dimm,memdev=ram-node1,node=1
>
> that would allow to avoid synthetic -numa option
You still need -numa for cpus, at least in the short/medium-term.
> but would require conversion
> of initial RAM to dimms. That would be more flexible for example allowing
> bind several backends to one node (like: 1Gb_hugepage + 2Mb_hugepage ones)
Yes, that's another possibility, perhaps even cleaner.
With "-numa node,memdev=", your board only needs to use
memory_region_allocate_system_memory in order to apply a NUMA policy to
guest RAM; it also works with guests or boards that are not themselves
NUMA-aware.
Doing the same with "-device dimm" requires changing the board to
support RAM-as-dimms; do you have any idea how easy/hard that would be?
Paolo
- [Qemu-devel] [RFC PATCH 09/14] qom: fix leak for objects created with -object, (continued)
- [Qemu-devel] [RFC PATCH 09/14] qom: fix leak for objects created with -object, Paolo Bonzini, 2013/12/11
- [Qemu-devel] [RFC PATCH 10/14] qom: catch errors in object_property_add_child, Paolo Bonzini, 2013/12/11
- [Qemu-devel] [RFC PATCH 11/14] pc: pass QEMUMachineInitArgs to pc_memory_init, Paolo Bonzini, 2013/12/11
- [Qemu-devel] [RFC PATCH 12/14] numa: introduce memory_region_allocate_system_memory, Paolo Bonzini, 2013/12/11
- [Qemu-devel] [RFC PATCH 13/14] add memdev backend infrastructure, Paolo Bonzini, 2013/12/11
- [Qemu-devel] [RFC PATCH 14/14] numa: add -numa node, memdev= option, Paolo Bonzini, 2013/12/11