Hey Baolin, Maybe I spotted a bug and made a change to this patch as follows. diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 824eff9211db..f3c4e08c6d30 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2994,6 +2994,7 @@ int split_huge_page_to_list_to_order(struct page *page, struct list_head *list, XA_STATE_ORDER(xas, &folio->mapping->i_pages, folio->index, new_order); struct anon_vma *anon_vma = NULL; struct address_space *mapping = NULL; + int order = folio_order(folio); int extra_pins, ret; pgoff_t end; bool is_hzp; @@ -3172,7 +3173,7 @@ int split_huge_page_to_list_to_order(struct page *page, struct list_head *list, i_mmap_unlock_read(mapping); out: xas_destroy(&xas); - if (folio_test_pmd_mappable(folio)) IIUC, if we split the folio successfully, it won’t be large here. + if (order >= HPAGE_PMD_ORDER) count_vm_event(!ret ? THP_SPLIT_PAGE : THP_SPLIT_PAGE_FAILED); return ret; } Thanks, Lance
