[RFC v1 06/19] mm, vmscan: use for_each_node in do_try_to_free_pages()

[Pengfei Li]

In do_try_to_free_pages(), we want to traverse node instead of zone,
so use for_each_node instead of for_each_zone.

Signed-off-by: Pengfei Li <fly@xxxxxxxxxxx>
---
 mm/vmscan.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index a3ad433c8ff4..159a2aaa8db1 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3033,9 +3033,9 @@ static unsigned long do_try_to_free_pages(struct nodelist *nodelist,
 					  struct scan_control *sc)
 {
 	int initial_priority = sc->priority;
-	pg_data_t *last_pgdat;
+	pg_data_t *pgdat;
 	struct nlist_traverser t;
-	struct zone *zone;
+	int node;
 retry:
 	delayacct_freepages_start();
 
@@ -3062,20 +3062,17 @@ static unsigned long do_try_to_free_pages(struct nodelist *nodelist,
 			sc->may_writepage = 1;
 	} while (--sc->priority >= 0);
 
-	last_pgdat = NULL;
-	for_each_zone_nlist_nodemask(zone, &t, nodelist, sc->reclaim_idx,
-					sc->nodemask) {
-		if (zone->zone_pgdat == last_pgdat)
-			continue;
-		last_pgdat = zone->zone_pgdat;
+	for_each_node_nlist_nodemask(node, &t, nodelist,
+					sc->reclaim_idx, sc->nodemask) {
+		pgdat = NODE_DATA(node);
 
-		snapshot_refaults(sc->target_mem_cgroup, zone->zone_pgdat);
+		snapshot_refaults(sc->target_mem_cgroup, pgdat);
 
 		if (cgroup_reclaim(sc)) {
 			struct lruvec *lruvec;
 
 			lruvec = mem_cgroup_lruvec(sc->target_mem_cgroup,
-						   zone->zone_pgdat);
+						   pgdat);
 			clear_bit(LRUVEC_CONGESTED, &lruvec->flags);
 		}
 	}
-- 
2.23.0