Re: [PATCH 6/9] mm/swapfile: Make folio_dup_swap batchable

[Matthew Wilcox]

On Wed, Mar 11, 2026 at 11:12:22AM +0530, Dev Jain wrote:
> On 10/03/26 2:19 pm, Lorenzo Stoakes (Oracle) wrote:
> > On Tue, Mar 10, 2026 at 01:00:10PM +0530, Dev Jain wrote:
> >> Teach folio_dup_swap to handle a batch of consecutive pages. Note that
> >> folio_dup_swap already can handle a subset of this: nr_pages == 1 and
> >> nr_pages == folio_nr_pages(folio). Generalize this to any nr_pages.
> >>
> >> Currently we have a not-so-nice logic of passing in subpage == NULL if
> >> we mean to exercise the logic on the entire folio, and subpage != NULL if
> >> we want to exercise the logic on only that subpage. Remove this
> >> indirection, and explicitly pass subpage != NULL, and the number of
> >> pages required.
> > 
> > You've made the interface more confusing? Now we can update multiple subpages
> > but specify only one? :)

For the next version, please lose the "subpage" name.  It's just a page.
folios have pages, not subpages.