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Re: [Qemu-devel] [RFC PATCH v0] numa: API to lookup NUMA node by address
From: |
Bharata B Rao |
Subject: |
Re: [Qemu-devel] [RFC PATCH v0] numa: API to lookup NUMA node by address |
Date: |
Thu, 11 Jun 2015 12:34:44 +0530 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
On Thu, Jun 11, 2015 at 08:56:03AM +0200, Igor Mammedov wrote:
<snip>
> > > > And to make this work, it needs to be aware of NUMA information for
> > > > hotplugged memory too.
> > > I've checked spapr_populate_drconf_memory() from original series,
> > > it needs to be aware at startup about address ranges -> node mapping
> > > including mapping partitioning of whole hotplug memory range
> > > (i.e. not actual hotplugged memory).
> > > -numa node_mem & numa_set_mem_node_id() are sufficient for this purpose
> >
> > spapr_populate_drconf_memory() needs to know about node information for
> > boot time memory as well as the hotplugged pc-dimm memory. Since chunks
> > of hotplug memory range could be plugged into any node, we need to
> > be able to locate the node id for such memory range. This is where
> > numa_set_mem_node_id() call for each realized dimm will help.
> So you are saying that spapr_populate_drconf_memory() doesn't need to know
> in advance about unplugged memory ranges and could be updated at runtime.
> (I've thought that device tree is build only at boot and guest can't
> accept dynamic updates to it, therefore you'd need provide addr -> node_id
> mapping at boot time including for not yet plugged memory).
Here are we dynamically adding a device tree node at runtime when guest
issues ibm,architecture-client-support call during early boot. Guest firmware
(SLOF) has already been updated to support such dynamic update.
During hotplug the node id information is also updated in
ibm,dynamic-memory property that is present under this device tree node.
Regards,
Bharata.
- Re: [Qemu-devel] [RFC PATCH v0] numa: API to lookup NUMA node by address, (continued)
- Re: [Qemu-devel] [RFC PATCH v0] numa: API to lookup NUMA node by address, Igor Mammedov, 2015/06/08
- Re: [Qemu-devel] [RFC PATCH v0] numa: API to lookup NUMA node by address, Eduardo Habkost, 2015/06/08
- Re: [Qemu-devel] [RFC PATCH v0] numa: API to lookup NUMA node by address, Igor Mammedov, 2015/06/09
- Re: [Qemu-devel] [RFC PATCH v0] numa: API to lookup NUMA node by address, Eduardo Habkost, 2015/06/09
- Re: [Qemu-devel] [RFC PATCH v0] numa: API to lookup NUMA node by address, Igor Mammedov, 2015/06/10
- Re: [Qemu-devel] [RFC PATCH v0] numa: API to lookup NUMA node by address, Eduardo Habkost, 2015/06/10
- Re: [Qemu-devel] [RFC PATCH v0] numa: API to lookup NUMA node by address, Bharata B Rao, 2015/06/10
- Re: [Qemu-devel] [RFC PATCH v0] numa: API to lookup NUMA node by address, Igor Mammedov, 2015/06/11
- Re: [Qemu-devel] [RFC PATCH v0] numa: API to lookup NUMA node by address,
Bharata B Rao <=