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Re: [PATCH 07/11] xen/page_alloc: Set node affinity when claiming pages from an exact node
- To: Alejandro Vallejo <alejandro.vallejo@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 11 Jun 2025 15:51:40 +0200
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- Cc: Bernhard Kaindl <bernhard.kaindl@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 11 Jun 2025 13:51:54 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 14.03.2025 18:24, Alejandro Vallejo wrote:
> Set the domain's node affinity to the claimed node if the claim
> specified an exact node. Do it immediately before making any changes in
> case setting the affinity fails (even though it shouldn't).
>
> This allows preferentially allocating from the closest NUMA node when
> "exact" is not specified (e.g: p2m tables, etc).
>
> Signed-off-by: Alejandro Vallejo <alejandro.vallejo@xxxxxxxxx>
> ---
> Toolstacks can just do it themselves, but it's more error prone. If it
> claimed pages from an exact node (and remember we can only hold a single
> claim at a time) it makes no sense for the domain to be intentionally
> allocating from NUMA nodes other than its home node.
I question this as a global, built-in policy: An admin may intentionally
do things in different ways, for whatever reasons they may have. Even in
the toolstack I'd consider such behavior a valid default, but requiring
a way to override.
Jan
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