mm: allow non-hugetlb large folios to be batch processed

Hugetlb folios still get special treatment, but normal large folios can
now be freed by free_unref_folios().  This should have a reasonable
performance impact, TBD.

Link: https://lkml.kernel.org/r/20240227174254.710559-11-willy@infradead.orgSigned-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/swap.c

@@ -1003,12 +1003,13 @@ void folios_put_refs(struct folio_batch *folios, unsigned int *refs)
 		if (!folio_ref_sub_and_test(folio, nr_refs))
 			continue;
 
-		if (folio_test_large(folio)) {
+		/* hugetlb has its own memcg */
+		if (folio_test_hugetlb(folio)) {
 			if (lruvec) {
 				unlock_page_lruvec_irqrestore(lruvec, flags);
 				lruvec = NULL;
 			}
-			__folio_put_large(folio);
+			free_huge_folio(folio);
 			continue;
 		}