On Tue, Jan 26, 2021 at 10:01:11PM +0000, Matthew Wilcox wrote:

On Fri, Jan 22, 2021 at 03:05:53PM -0700, Yu Zhao wrote:

quoted

+++ b/mm/swap.c

@@ -231,7 +231,7 @@ static void pagevec_move_tail_fn(struct page *page, struct lruvec *lruvec)
 	if (!PageUnevictable(page)) {
 		del_page_from_lru_list(page, lruvec, page_lru(page));
 		ClearPageActive(page);
-		add_page_to_lru_list_tail(page, lruvec, page_lru(page));
+		add_page_to_lru_list_tail(page, lruvec);
 		__count_vm_events(PGROTATED, thp_nr_pages(page));
 	}

Is it profitable to do ...

-		del_page_from_lru_list(page, lruvec, page_lru(page));
+		enum lru_list lru = page_lru(page);
+		del_page_from_lru_list(page, lruvec, lru);
		ClearPageActive(page);
-		add_page_to_lru_list_tail(page, lruvec, page_lru(page));
+		lru &= ~LRU_ACTIVE;
+		add_page_to_lru_list_tail(page, lruvec, lru);

Ok, now we want to trade readability for size. Sure, I'll see how
much we could squeeze.