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Re: [XEN RFC PATCH 00/40] Add device tree based NUMA support to Arm64

  • To: Julien Grall <julien@xxxxxxx>
  • From: Bertrand Marquis <Bertrand.Marquis@xxxxxxx>
  • Date: Thu, 19 Aug 2021 14:05:35 +0000
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  • Cc: Wei Chen <Wei.Chen@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, "sstabellini@xxxxxxxxxx" <sstabellini@xxxxxxxxxx>, "jbeulich@xxxxxxxx" <jbeulich@xxxxxxxx>
  • Delivery-date: Thu, 19 Aug 2021 14:06:01 +0000
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  • Thread-topic: [XEN RFC PATCH 00/40] Add device tree based NUMA support to Arm64

Hi Julien,

> On 19 Aug 2021, at 14:42, Julien Grall <julien@xxxxxxx> wrote:
> Hi Wei,
> On 11/08/2021 11:23, Wei Chen wrote:
>> Xen memory allocation and scheduler modules are NUMA aware.
>> But actually, on x86 has implemented the architecture APIs
>> to support NUMA. Arm was providing a set of fake architecture
>> APIs to make it compatible with NUMA awared memory allocation
>> and scheduler.
>> Arm system was working well as a single node NUMA system with
>> these fake APIs, because we didn't have multiple nodes NUMA
>> system on Arm. But in recent years, more and more Arm devices
>> support multiple nodes NUMA system. Like TX2, some Hisilicon
>> chips and the Ampere Altra.
> All the platforms you mention here are servers (so mainly ACPI). However, 
> this series is adding DT support.
> Could you outline the long term plan for DT? Is it going to be used on 
> production HW?

Yes we are already and will continue to use this on production HW.
Some embedded hardware will have some usage of NUMA (as some embedded functions 
do require lots of computing power).
We are doing experiments of that right now using those patches.


> Cheers,
> -- 
> Julien Grall



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