fuse: add support for mandatory locking

[safe/jmp/linux-2.6] / mm / vmscan.c

diff --git a/mm/vmscan.c b/mm/vmscan.c
index d8893dc..e147138 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1108,8 +1108,6 @@ static unsigned long shrink_zone(int priority, struct zone *zone,
        unsigned long nr_to_scan;
        unsigned long nr_reclaimed = 0;
 
-       zone_set_flag(zone, ZONE_RECLAIM_LOCKED);
-
        /*
         * Add one to `nr_to_scan' just to make sure that the kernel will
         * slowly sift through the active list.
@@ -1148,8 +1146,6 @@ static unsigned long shrink_zone(int priority, struct zone *zone,
        }
 
        throttle_vm_writeout(sc->gfp_mask);
-
-       zone_clear_flag(zone, ZONE_RECLAIM_LOCKED);
        return nr_reclaimed;
 }
 
@@ -1900,6 +1896,7 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
 int zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
 {
        int node_id;
+       int ret;
 
        /*
         * Zone reclaim reclaims unmapped file backed pages and
@@ -1917,13 +1914,13 @@ int zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
                        <= zone->min_slab_pages)
                return 0;
 
+       if (zone_is_all_unreclaimable(zone))
+               return 0;
+
        /*
-        * Avoid concurrent zone reclaims, do not reclaim in a zone that does
-        * not have reclaimable pages and if we should not delay the allocation
-        * then do not scan.
+        * Do not scan if the allocation should not be delayed.
         */
-       if (!(gfp_mask & __GFP_WAIT) || zone_is_all_unreclaimable(zone) ||
-               zone_is_reclaim_locked(zone) || (current->flags & PF_MEMALLOC))
+       if (!(gfp_mask & __GFP_WAIT) || (current->flags & PF_MEMALLOC))
                        return 0;
 
        /*
@@ -1935,6 +1932,12 @@ int zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
        node_id = zone_to_nid(zone);
        if (node_state(node_id, N_CPU) && node_id != numa_node_id())
                return 0;
-       return __zone_reclaim(zone, gfp_mask, order);
+
+       if (zone_test_and_set_flag(zone, ZONE_RECLAIM_LOCKED))
+               return 0;
+       ret = __zone_reclaim(zone, gfp_mask, order);
+       zone_clear_flag(zone, ZONE_RECLAIM_LOCKED);
+
+       return ret;
 }
 #endif