Re: [PATCH 5/6] mm/page_io: convert count_swpout_vm_event() to take in a folio

[Matthew Wilcox]

On Mon, Jul 17, 2023 at 09:26:01PM +0800, Peng Zhang wrote:
> -static inline void count_swpout_vm_event(struct page *page)
> +static inline void count_swpout_vm_event(struct folio *folio)
>  {
>  #ifdef CONFIG_TRANSPARENT_HUGEPAGE
> -	if (unlikely(PageTransHuge(page)))
> +	if (unlikely(folio_test_large(folio)))
>  		count_vm_event(THP_SWPOUT);
>  #endif

Since this is a THP_SWPOUT event, we should do this as:

-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-	if (unlikely(PageTransHuge(page)))
+	if (folio_test_pmd_mappable(folio))
		count_vm_event(THP_SWPOUT);
-#endif