On Mon, Mar 18, 2019 at 12:27:59PM +0300, Kirill Tkhai wrote: > @@ -1945,6 +1942,8 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec, > count_memcg_events(lruvec_memcg(lruvec), PGSTEAL_DIRECT, > nr_reclaimed); > } > + reclaim_stat->recent_rotated[0] = stat.nr_activate[0]; > + reclaim_stat->recent_rotated[1] = stat.nr_activate[1]; Surely this should be +=, right? Otherwise we maintain essentially no history of page rotations and that wreaks havoc on the page cache vs. swapping reclaim balance.
