1 files changed, 12 insertions, 7 deletions

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 39fdfb14eeaa..5fa3eda1f03f 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -63,6 +63,9 @@ struct scan_control {
         /* Can mapped pages be reclaimed? */
         int may_unmap;
 
+        /* Can pages be swapped as part of reclaim? */
+        int may_swap;
+
         /* This context's SWAP_CLUSTER_MAX. If freeing memory for
          * suspend, we effectively ignore SWAP_CLUSTER_MAX.
          * In this context, it doesn't matter that we scan the
@@ -1380,7 +1383,7 @@ static void get_scan_ratio(struct zone *zone, struct scan_control *sc,
         struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(zone, sc);
 
         /* If we have no swap space, do not bother scanning anon pages. */
-        if (nr_swap_pages <= 0) {
+        if (!sc->may_swap || (nr_swap_pages <= 0)) {
                 percent[0] = 0;
                 percent[1] = 100;
                 return;
@@ -1468,7 +1471,7 @@ static void shrink_zone(int priority, struct zone *zone,
 
         for_each_evictable_lru(l) {
                 int file = is_file_lru(l);
-                int scan;
+                unsigned long scan;
 
                 scan = zone_nr_pages(zone, sc, l);
                 if (priority) {
@@ -1697,6 +1700,7 @@ unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
                 .may_writepage = !laptop_mode,
                 .swap_cluster_max = SWAP_CLUSTER_MAX,
                 .may_unmap = 1,
+                .may_swap = 1,
                 .swappiness = vm_swappiness,
                 .order = order,
                 .mem_cgroup = NULL,
@@ -1717,6 +1721,7 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem_cont,
         struct scan_control sc = {
                 .may_writepage = !laptop_mode,
                 .may_unmap = 1,
+                .may_swap = !noswap,
                 .swap_cluster_max = SWAP_CLUSTER_MAX,
                 .swappiness = swappiness,
                 .order = 0,
@@ -1726,9 +1731,6 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem_cont,
         };
         struct zonelist *zonelist;
 
-        if (noswap)
-                sc.may_unmap = 0;
-
         sc.gfp_mask = (gfp_mask & GFP_RECLAIM_MASK) |
                         (GFP_HIGHUSER_MOVABLE & ~GFP_RECLAIM_MASK);
         zonelist = NODE_DATA(numa_node_id())->node_zonelists;
@@ -1767,6 +1769,7 @@ static unsigned long balance_pgdat(pg_data_t *pgdat, int order)
         struct scan_control sc = {
                 .gfp_mask = GFP_KERNEL,
                 .may_unmap = 1,
+                .may_swap = 1,
                 .swap_cluster_max = SWAP_CLUSTER_MAX,
                 .swappiness = vm_swappiness,
                 .order = order,
@@ -2088,13 +2091,13 @@ static void shrink_all_zones(unsigned long nr_pages, int prio,
                                 nr_reclaimed += shrink_list(l, nr_to_scan, zone,
                                                                 sc, prio);
                                 if (nr_reclaimed >= nr_pages) {
-                                        sc->nr_reclaimed = nr_reclaimed;
+                                        sc->nr_reclaimed += nr_reclaimed;
                                         return;
                                 }
                         }
                 }
         }
-        sc->nr_reclaimed = nr_reclaimed;
+        sc->nr_reclaimed += nr_reclaimed;
 }
 
 /*
@@ -2115,6 +2118,7 @@ unsigned long shrink_all_memory(unsigned long nr_pages)
                 .may_unmap = 0,
                 .may_writepage = 1,
                 .isolate_pages = isolate_pages_global,
+                .nr_reclaimed = 0,
         };
 
         current->reclaim_state = &reclaim_state;
@@ -2297,6 +2301,7 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
         struct scan_control sc = {
                 .may_writepage = !!(zone_reclaim_mode & RECLAIM_WRITE),
                 .may_unmap = !!(zone_reclaim_mode & RECLAIM_SWAP),
+                .may_swap = 1,
                 .swap_cluster_max = max_t(unsigned long, nr_pages,
                                         SWAP_CLUSTER_MAX),
                 .gfp_mask = gfp_mask,