mm/memory: fix IO cost for anonymous page

With synchronous IO swap device, swap-in is directly handled in fault code. Since IO cost notation isn't added there, with synchronous IO swap device, LRU balancing could be wrongly biased. Fix it to count it in fault code. Link: http://lkml.kernel.org/r/[email protected] Fixes: 314b57f ("mm: balance LRU lists based on relative thrashing cache sizing") Signed-off-by: Joonsoo Kim <[email protected]> Acked-by: Johannes Weiner <[email protected]> Cc: Joonsoo Kim <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Minchan Kim <[email protected]> Cc: Rik van Riel <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
mrcsosa · Jun 26, 2020 · 0076f02 · 0076f02
1 parent cb68688
commit 0076f02
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/mm/memory.c b/mm/memory.c
@@ -3146,6 +3146,14 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
 					goto out_page;
 				}
 
+				/*
+				 * XXX: Move to lru_cache_add() when it
+				 * supports new vs putback
+				 */
+				spin_lock_irq(&page_pgdat(page)->lru_lock);
+				lru_note_cost_page(page);
+				spin_unlock_irq(&page_pgdat(page)->lru_lock);
+
 				lru_cache_add(page);
 				swap_readpage(page, true);
 			}