mm/vmscan: convert reclaim_clean_pages_from_list() to folios

Patch series "nvert much of vmscan to folios"

vmscan always operates on folios since it puts the pages on the LRU list. 
Switching all of these functions from pages to folios saves 1483 bytes of
text from removing all the baggage around calling compound_page() and
similar functions.


This patch (of 5):

This is a straightforward conversion which removes several hidden calls
to compound_head, saving 330 bytes of kernel text.

Link: https://lkml.kernel.org/r/20220617154248.700416-1-willy@infradead.org
Link: https://lkml.kernel.org/r/20220617154248.700416-2-willy@infradead.orgSigned-off-by: NMatthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>

include/linux/page-flags.h

@@ -670,6 +670,12 @@ static __always_inline bool PageAnon(struct page *page)
 	return folio_test_anon(page_folio(page));
 }
 
+static __always_inline bool __folio_test_movable(const struct folio *folio)
+{
+	return ((unsigned long)folio->mapping & PAGE_MAPPING_FLAGS) ==
+			PAGE_MAPPING_MOVABLE;
+}
+
 static __always_inline int __PageMovable(struct page *page)
 {
 	return ((unsigned long)page->mapping & PAGE_MAPPING_FLAGS) ==

mm/vmscan.c

@@ -2041,7 +2041,7 @@ static unsigned int shrink_page_list(struct list_head *page_list,
 }
 
 unsigned int reclaim_clean_pages_from_list(struct zone *zone,
-					    struct list_head *page_list)
+					    struct list_head *folio_list)
 {
 	struct scan_control sc = {
 		.gfp_mask = GFP_KERNEL,
@@ -2049,16 +2049,16 @@ unsigned int reclaim_clean_pages_from_list(struct zone *zone,
 	};
 	struct reclaim_stat stat;
 	unsigned int nr_reclaimed;
-	struct page *page, *next;
-	LIST_HEAD(clean_pages);
+	struct folio *folio, *next;
+	LIST_HEAD(clean_folios);
 	unsigned int noreclaim_flag;
 
-	list_for_each_entry_safe(page, next, page_list, lru) {
-		if (!PageHuge(page) && page_is_file_lru(page) &&
-		    !PageDirty(page) && !__PageMovable(page) &&
-		    !PageUnevictable(page)) {
-			ClearPageActive(page);
-			list_move(&page->lru, &clean_pages);
+	list_for_each_entry_safe(folio, next, folio_list, lru) {
+		if (!folio_test_hugetlb(folio) && folio_is_file_lru(folio) &&
+		    !folio_test_dirty(folio) && !__folio_test_movable(folio) &&
+		    !folio_test_unevictable(folio)) {
+			folio_clear_active(folio);
+			list_move(&folio->lru, &clean_folios);
 		}
 	}
 
@@ -2069,11 +2069,11 @@ unsigned int reclaim_clean_pages_from_list(struct zone *zone,
 	 * change in the future.
 	 */
 	noreclaim_flag = memalloc_noreclaim_save();
-	nr_reclaimed = shrink_page_list(&clean_pages, zone->zone_pgdat, &sc,
+	nr_reclaimed = shrink_page_list(&clean_folios, zone->zone_pgdat, &sc,
 					&stat, true);
 	memalloc_noreclaim_restore(noreclaim_flag);
 
-	list_splice(&clean_pages, page_list);
+	list_splice(&clean_folios, folio_list);
 	mod_node_page_state(zone->zone_pgdat, NR_ISOLATED_FILE,
 			    -(long)nr_reclaimed);
 	/*