linux-master/mm/vmscan.c

3144 	int new_gen, old_gen = lru_gen_from_seq(lrugen->min_seq[type]);
3150 		new_gen = ((old_flags & LRU_GEN_MASK) >> LRU_GEN_PGOFF) - 1;
3152 		if (new_gen >= 0 && new_gen != old_gen)
3153 			return new_gen;
3155 		new_gen = (old_gen + 1) % MAX_NR_GENS;
3158 		new_flags |= (new_gen + 1UL) << LRU_GEN_PGOFF;
3164 	lru_gen_update_size(lruvec, folio, old_gen, new_gen);
3166 	return new_gen;
3170 			      int old_gen, int new_gen)
3177 	VM_WARN_ON_ONCE(new_gen >= MAX_NR_GENS);
3182 	walk->nr_pages[new_gen][type][zone] += delta;
3359 	int old_gen, new_gen = lru_gen_from_seq(max_seq);
3403 		old_gen = folio_update_gen(folio, new_gen);
3404 		if (old_gen >= 0 && old_gen != new_gen)
3405 			update_batch_size(walk, folio, old_gen, new_gen);
3427 	int old_gen, new_gen = lru_gen_from_seq(max_seq);
3483 		old_gen = folio_update_gen(folio, new_gen);
3484 		if (old_gen >= 0 && old_gen != new_gen)
3485 			update_batch_size(walk, folio, old_gen, new_gen);
3703 	int new_gen, old_gen = lru_gen_from_seq(lrugen->min_seq[type]);
3720 			new_gen = folio_inc_gen(lruvec, folio, false);
3721 			list_move_tail(&folio->lru, &lrugen->folios[new_gen][type][zone]);
4021 	int old_gen, new_gen = lru_gen_from_seq(max_seq);
4084 			old_gen = folio_update_gen(folio, new_gen);
4085 			if (old_gen >= 0 && old_gen != new_gen)
4086 				update_batch_size(walk, folio, old_gen, new_gen);
4094 		else if (old_gen != new_gen)