From: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> Current implementation of LRU management for anonymous page has some problems. Most important one is that it doesn't protect the workingset, that is, pages on the active LRU list. Although, this problem will be fixed in the following patchset, the preparation is required and this patch does it. What following patchset does is to restore workingset protection. In this case, newly created or swap-in pages are started their lifetime on the inactive list. If inactive list is too small, there is not enough chance to be referenced and the page cannot become the workingset. In order to provide enough chance to the newly anonymous pages, this patch makes active/inactive LRU ratio as 1:1. Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> --- mm/vmscan.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index 8763705..df92119 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2203,7 +2203,7 @@ static bool inactive_is_low(struct lruvec *lruvec, enum lru_list inactive_lru) active = lruvec_page_state(lruvec, NR_LRU_BASE + active_lru); gb = (inactive + active) >> (30 - PAGE_SHIFT); - if (gb) + if (gb && is_file_lru(inactive_lru)) inactive_ratio = int_sqrt(10 * gb); else inactive_ratio = 1; -- 2.7.4
