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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: |
Mon, 8 Jun 2015 11:28:18 +0530 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
On Mon, May 25, 2015 at 02:42:40PM -0300, Eduardo Habkost wrote:
> On Mon, May 25, 2015 at 01:17:57PM +0530, Bharata B Rao wrote:
> > On Thu, May 14, 2015 at 11:39:06AM +0200, Paolo Bonzini wrote:
> > > On 13/05/2015 20:06, Eduardo Habkost wrote:
> > > > Also, this introduces a circular dependency between pc-dimm.c and
> > > > numa.c. Instead of that, pc-dimm could simply notify us when a new
> > > > device is realized (with just (addr, end, node) as arguments), so we can
> > > > save the list of memory ranges inside struct node_info.
> > > >
> > > > I wonder if the memory API already provides something that would help
> > > > us. Paolo, do you see a way we could simply use a MemoryRegion as input
> > > > to lookup the NUMA node?
> > >
> > > No, but I guess you could add a numa_get/set_memory_region_node_id API
> > > that uses a hash table. That's a variant of the "pc-dimm could simply
> > > notify" numa.c that you propose above.
> >
> > While you say we can't use MemoryRegion as input to lookup the NUMA node,
> > you suggest that we add numa_get/set_memory_region_node_id. Does this API
> > get/set NUMA node id for the given MemoryRegion ?
>
> I was going to suggest that, but it would require changing the
> non-memdev code path to create a MemoryRegion for each node, too. So
> having a numa_set_mem_node_id(start_addr, end_addr, node_id) API would
> be simpler.
In order to save the list of memory ranges inside node_info, I tried this
approach where I call
numa_set_mem_node_id(dimm.addr, dimm.size, dimm.node) from
pc_dimm_realize(), but
the value of dimm.addr is finalized only later in ->plug().
So we would have to call this API from arch code like pc_dimm_plug().
Is that acceptable ?
Regards,
Bharata.
- Re: [Qemu-devel] [RFC PATCH v0] numa: API to lookup NUMA node by address,
Bharata B Rao <=
- 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