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SubjectRe: [PATCH v4] mm/rmap: do not add fully unmapped large folio to deferred split list
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> @@ -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


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