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Re: [Xen-devel] [PATCH 2/4] [HVM] introduce CPU affinity for allocate_physmap call


  • To: Andre Przywara <andre.przywara@xxxxxxx>
  • From: Keir Fraser <keir@xxxxxxxxxxxxx>
  • Date: Wed, 15 Aug 2007 11:43:12 +0100
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Wed, 15 Aug 2007 03:43:58 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcffKROrUnXRk0scEdybswAX8io7RQ==
  • Thread-topic: [Xen-devel] [PATCH 2/4] [HVM] introduce CPU affinity for allocate_physmap call



On 15/8/07 11:13, "Andre Przywara" <andre.przywara@xxxxxxx> wrote:

>> I think we should add topology discovery hypercalls. Xen needs to know this
>> stuff anyway, so we just provide a mechanism for guests to extract it. An
>> alternative is to start exporting virtual ACPI tables to PV guests.
> I will look at this next. The HVM approach seemed to be easier from my
> POV, but this NUMA propagation is also benefical for PV guests. Maybe
> one should solve the whole NUMA-ballooning issue while looking at this.

Topology discovery hypercalls are the way to go imo. And to fix ballooking
it's just going to have to become numa-aware, by hooking into whatever numa
apis Linux provides internally.

 -- Keir


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