Re: [PATCH v4 5/7] mm: thp: split huge page to any lower order pages (except order-1).

[David Hildenbrand]

On 13.02.24 23:05, Luis Chamberlain wrote:
> On Tue, Feb 13, 2024 at 04:55:18PM -0500, Zi Yan wrote:
> > From: Zi Yan <ziy@xxxxxxxxxx>
> > Order-1 folio is not supported because _deferred_list, which is used by
> > partially mapped folios, is stored in subpage 2 and an order-1 folio only
> > has subpage 0 and 1.
>
> The LBS patches has the patch from Matthew which enables and allowed us
> to successfully test order 1. So this restriction could be dropped if
> that gets merged.

For anon folios it will still be in place, so the restriction will only 
be dropped for !anon.

--
Cheers,

David / dhildenb