Re: [PATCH 00/49] mm: Generalize vmemmap optimization for DAX and HugeTLB

David Hildenbrand (arm)
2026-04-06T20:00:09Z

On 4/5/26 14:51, Muchun Song wrote:
> Overview:
> This patch series generalizes the HugeTLB Vmemmap Optimization (HVO)
> into a generic vmemmap optimization framework that can be used by both
> HugeTLB and DAX.
>
> Background:
> Currently, the vmemmap optimization feature is highly coupled with
> HugeTLB. However, DAX also has similar requirements for optimizing vmemmap
> pages to save memory.

guest_memfd also wants to make use of this (e.g., through folios
allocated from hugetlb, where it might have to undo HVO).

CCing Ackerley.

--
Cheers,

David