[PATCH v4 3/4] mm: Support batched unmap for lazyfree large folios during reclamation
David Hildenbrand
david at redhat.com
Thu Jun 26 14:52:51 PDT 2025
On 26.06.25 23:46, Barry Song wrote:
> On Thu, Jun 26, 2025 at 9:29 PM Lance Yang <ioworker0 at gmail.com> wrote:
>>
> [...]
>> +
>> + /*
>> + * If we are sure that we batched the entire folio and cleared
>> + * all PTEs, we can just optimize and stop right here.
>> + */
>> + if (nr_pages == folio_nr_pages(folio))
>
> David also mentioned if (nr_pages > 1 && nr_pages == folio_nr_pages(folio)).
> I assume it’s still fine when nr_pages == 1 for small folios? No?
Yeah, as raised I think it is fine. We should never have any folio page
mapped multiple times into the same VMA in any case. (excluding KSM
pages, but they are handled differenty, using a specialized rmap walk)
--
Cheers,
David / dhildenb
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