mm-mglru-batch-move-folios-to-the-second-oldest-gens-lru.patch removed from -mm tree

@@ -3936,6 +3936,19 @@ static void clear_mm_walk(void)
 		kfree(walk);
 }
 
+static inline void flush_lru_batch(struct list_head *head, struct list_head **batch_end,
+				   struct list_head *dst)
+{
+	LIST_HEAD(movable);
+
+	if (!*batch_end)
+		return;
+
+	list_cut_position(&movable, head, *batch_end);
+	list_splice_tail_init(&movable, dst);
+	*batch_end = NULL;
+}
+
 static bool inc_min_seq(struct lruvec *lruvec, int type, int swappiness)
 {
 	int zone;

@@ -3958,8 +3971,10 @@ static bool inc_min_seq(struct lruvec *l
 			lru_gen_is_active(lruvec, target_gen));
 	/* prevent cold/hot inversion if the type is evictable */
 	for (zone = 0; zone < MAX_NR_ZONES; zone++) {
+		struct list_head *target_list = &lrugen->folios[target_gen][type][zone];
 		struct list_head *head = &lrugen->folios[old_gen][type][zone];
 		struct list_head *pos = head->next;
+		struct list_head *batch_end = NULL;
 		long delta = 0;
 
 		while (pos != head) {

@@ -3984,7 +3999,7 @@ static bool inc_min_seq(struct lruvec *l
 			 */
 			if (gen_increased) {
 				delta += nr_pages;
-				list_move_tail(&folio->lru, &lrugen->folios[new_gen][type][zone]);
+				batch_end = &folio->lru;
 
 				/* don't count the workingset being lazily promoted */
 				if (refs + workingset != BIT(LRU_REFS_WIDTH) + 1) {

@@ -3994,11 +4009,14 @@ static bool inc_min_seq(struct lruvec *l
 						   lrugen->protected[hist][type][tier] + nr_pages);
 				}
 			} else {
+				flush_lru_batch(head, &batch_end, target_list);
 				list_move(&folio->lru, &lrugen->folios[new_gen][type][zone]);
 			}
 			if (!--remaining)
 				break;
 		}
+		flush_lru_batch(head, &batch_end, target_list);
+
 		WRITE_ONCE(lrugen->nr_pages[old_gen][type][zone],
 			   lrugen->nr_pages[old_gen][type][zone] - delta);
 		WRITE_ONCE(lrugen->nr_pages[target_gen][type][zone],