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

[Dev Jain]

On 13/02/26 10:49 am, Barry Song wrote:
> On Mon, Feb 9, 2026 at 5:43 PM Baolin Wang
> <baolin.wang at 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 :-)

On it :)

>
> Best regards
> Barry