mm/memcg: move reclaim_stat into lruvec

With mem_cgroup_disabled() now explicit, it becomes clear that the
zone_reclaim_stat structure actually belongs in lruvec, per-zone when
memcg is disabled but per-memcg per-zone when it's enabled.

We can delete mem_cgroup_get_reclaim_stat(), and change
update_page_reclaim_stat() to update just the one set of stats, the one
which get_scan_count() will actually use.

Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Reviewed-by: Minchan Kim <minchan@kernel.org>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Cc: Glauber Costa <glommer@parallels.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 4 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 4fc462b5fcf1..8cbfc38e68ac 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4410,10 +4410,10 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat,
                 zone_pcp_init(zone);
                 for_each_lru(lru)
                         INIT_LIST_HEAD(&zone->lruvec.lists[lru]);
-                zone->reclaim_stat.recent_rotated[0] = 0;
-                zone->reclaim_stat.recent_rotated[1] = 0;
-                zone->reclaim_stat.recent_scanned[0] = 0;
-                zone->reclaim_stat.recent_scanned[1] = 0;
+                zone->lruvec.reclaim_stat.recent_rotated[0] = 0;
+                zone->lruvec.reclaim_stat.recent_rotated[1] = 0;
+                zone->lruvec.reclaim_stat.recent_scanned[0] = 0;
+                zone->lruvec.reclaim_stat.recent_scanned[1] = 0;
                 zap_zone_vm_stats(zone);
                 zone->flags = 0;
                 if (!size)