Re: [PATCH v4] mm/rmap: do not add fully unmapped large folio to deferred split list

[David Hildenbrand]

> @@ -1553,9 +1557,9 @@ static __always_inline void __folio_remove_rmap(struct folio *folio,
>                    * page of the folio is unmapped and at least one page
>                    * is still mapped.
>                    */
> -               if (folio_test_large(folio) && folio_test_anon(folio))
> -                       if (level == RMAP_LEVEL_PTE || nr < nr_pmdmapped)
> -                               deferred_split_folio(folio);
> +               if (folio_test_large(folio) && folio_test_anon(folio) &&
> +                   list_empty(&folio->_deferred_list) && partially_mapped)
> +                       deferred_split_folio(folio);

And now I realize that we can then even drop the folio_test_large(folio) 
check here!

--
Cheers,

David / dhildenb