linux-5.10/mm/swap.c

263  * inactive list.
397 	 * a page is marked PageActive just after it is added to the inactive  in __lru_cache_activate_page()
415  * inactive,unreferenced	->	inactive,referenced
416  * inactive,referenced		->	active,unreferenced
483  * Place @page on the inactive or unevictable LRU list, depending on its
509  * inactive list to speed up its reclaim.  It is moved to the
518  * 2. active, dirty/writeback page -> inactive, head, PG_reclaim
519  * 3. inactive, mapped page -> none
520  * 4. inactive, dirty/writeback page -> inactive, head, PG_reclaim
521  * 5. inactive, clean -> inactive, tail
524  * In 4, why it moves inactive's head, the VM expects the page would
563 		 * We moves tha page into tail of inactive.  in lru_deactivate_file_fn()
691  * deactivate_page() moves @page to the inactive list if @page was on the active
713  * mark_page_lazyfree() moves @page to the inactive file list.