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Re: [PATCH v3 01/17] xen/arm: use NR_MEM_BANKS to override default NR_NODE_MEMBLKS
- To: Henry Wang <Henry.Wang@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 20 Apr 2023 14:21:03 +0200
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- Cc: Wei Chen <wei.chen@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 20 Apr 2023 12:21:12 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 20.04.2023 13:25, Henry Wang wrote:
> From: Wei Chen <wei.chen@xxxxxxx>
>
> As a memory range described in device tree cannot be split across
> multiple nodes. And it is very likely than if you have more than
> 64 nodes, you may need a lot more than 2 regions per node. So the
> default NR_NODE_MEMBLKS value (MAX_NUMNODES * 2) makes no sense
> on Arm.
>
> So, for Arm, we would just define NR_NODE_MEMBLKS as an alias to
> NR_MEM_BANKS. And in the future NR_MEM_BANKS will be user-configurable
> via kconfig, but for now leave NR_MEM_BANKS as 128 on Arm. This
> avoid to have different way to define the value based NUMA vs non-NUMA.
>
> Further discussions can be found here[1].
>
> [1] https://lists.xenproject.org/archives/html/xen-devel/2021-09/msg02322.html
>
> Signed-off-by: Wei Chen <wei.chen@xxxxxxx>
> Signed-off-by: Henry Wang <Henry.Wang@xxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
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