Re: [PATCH v3 20/20] mm: stop maintaining the per-page mapcount of large folios (CONFIG_NO_PAGE_MAPCOUNT)

[David Hildenbrand]

On 14.10.25 16:32, Matthew Wilcox wrote:
> On Tue, Oct 14, 2025 at 02:59:30PM +0200, David Hildenbrand wrote:
> > > As commit 349994cf61e6 mentioned, we don't support partially mapped PUD-sized
> > > folio yet.
> >
> > We do support partially mapped PUD-sized folios I think, but not anonymous
> > PUD-sized folios.
>
> I don't think so?  The only mechanism I know of to allocate PUD-sized
> chunks of memory is hugetlb, and that doesn't permit partial mappings.

Greetings from the latest DAX rework :)

--
Cheers

David / dhildenb