Re: [PATCH v5 5/5] mm: rmap: support batched unmapping for file large folios

[Barry Song <21cnbao@gmail.com>]

On Mon, Feb 9, 2026 at 5:43 PM Baolin Wang
<baolin.wang@linux.alibaba.com> wrote:
[...]
> >> ---
> >>   mm/rmap.c | 7 ++++---
> >>   1 file changed, 4 insertions(+), 3 deletions(-)
> >>
> >> diff --git a/mm/rmap.c b/mm/rmap.c
> >> index 985ab0b085ba..e1d16003c514 100644
> >> --- a/mm/rmap.c
> >> +++ b/mm/rmap.c
> >> @@ -1863,9 +1863,10 @@ static inline unsigned int
> >> folio_unmap_pte_batch(struct folio *folio,
> >>       end_addr = pmd_addr_end(addr, vma->vm_end);
> >>       max_nr = (end_addr - addr) >> PAGE_SHIFT;
> >> -    /* We only support lazyfree batching for now ... */
> >> -    if (!folio_test_anon(folio) || folio_test_swapbacked(folio))
> >> +    /* We only support lazyfree or file folios batching for now ... */
> >> +    if (folio_test_anon(folio) && folio_test_swapbacked(folio))
> >>           return 1;
> >
> > Right, the anon folio handling would require a bit more work in the
> >
> >
> >      } else if (folio_test_anon(folio)) {
> >
> > branch.
> >
> > Do you intend to tackle that one as well?
>  >> I'll reply to the fixup.
>
> I'm not sure whether Barry has time to continue this work. If he does
> not, I can take over. Barry?

I expect to have some availability after April 1st.
In the meantime, please feel free to send along any patches
if you and Dev would like to move forward before then :-)

Best regards
Barry