From: Chuanhua Han <hanchuanhua@xxxxxxxx> The function should_try_to_free_swap() operates under the assumption that swap-in always occurs at the normal page granularity, i.e., folio_nr_pages() = 1. However, in reality, for large folios, add_to_swap_cache() will invoke folio_ref_add(folio, nr). To accommodate large folio swap-in, this patch eliminates this assumption. Signed-off-by: Chuanhua Han <hanchuanhua@xxxxxxxx> Co-developed-by: Barry Song <v-songbaohua@xxxxxxxx> Signed-off-by: Barry Song <v-songbaohua@xxxxxxxx> Acked-by: Chris Li <chrisl@xxxxxxxxxx> Reviewed-by: Ryan Roberts <ryan.roberts@xxxxxxx> Reviewed-by: "Huang, Ying" <ying.huang@xxxxxxxxx> --- mm/memory.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/memory.c b/mm/memory.c index 74cdefd58f5f..22e7c33cc747 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3877,7 +3877,7 @@ static inline bool should_try_to_free_swap(struct folio *folio, * reference only in case it's likely that we'll be the exlusive user. */ return (fault_flags & FAULT_FLAG_WRITE) && !folio_test_ksm(folio) && - folio_ref_count(folio) == 2; + folio_ref_count(folio) == (1 + folio_nr_pages(folio)); } static vm_fault_t pte_marker_clear(struct vm_fault *vmf) -- 2.34.1
