Re: [PATCH v2] mm/mempolicy: recompute automatic interleave weights on memory hotplug

[David Hildenbrand]

On Fri, 30 Oct 2026 12:12:34 -0400, Gregory Price (Meta) wrote:
> In auto mode, weighted interleave derives each node's weight from its
> bandwidth, reduced over the nodes in N_MEMORY. HMAT and CXL report a
> node's bandwidth once, when the node first gains memory, and nothing
> else on the hotplug path recomputes the weights.
> 
> This can result in a major skew in distribution and overload tiers
> with more data than their respective bandwidth can support, resulting
> in a performance regression.
> 
> [...]

Applied, thanks!

tree: mm/core.git
branch: mempolicy-7.5.misc

Applied patches will appear soon in mm-next, followed by linux-next.

Please report any outstanding bugs that were missed during review, so we
can either drop the patch series or decide how to fix it up.

It is encouraged to provide Acked-bys, Reviewed-bys, and Tested-bys even
though the patches have already been applied. If possible, patch trailers
will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. Further, this is not a guarantee that the
patches will go upstream. If in doubt, please check the listed branch.

[1/1] mm/mempolicy: recompute automatic interleave weights on memory hotplug
      https://git.kernel.org/mm/core/c/ece8f7dc

-- 
Cheers,

David