vmscan: do not unconditionally treat zones that fail zone_reclaim() as full
[sfrench/cifs-2.6.git] / mm / page_alloc.c
index 6407cbfccd77ea0fb7399191670e152b6c0a9bff..2f457a756d4678cadc46f012af8691db8da32826 100644 (file)
@@ -1462,15 +1462,33 @@ zonelist_scan:
                BUILD_BUG_ON(ALLOC_NO_WATERMARKS < NR_WMARK);
                if (!(alloc_flags & ALLOC_NO_WATERMARKS)) {
                        unsigned long mark;
+                       int ret;
+
                        mark = zone->watermark[alloc_flags & ALLOC_WMARK_MASK];
-                       if (!zone_watermark_ok(zone, order, mark,
-                                   classzone_idx, alloc_flags)) {
-                               if (!zone_reclaim_mode ||
-                                   !zone_reclaim(zone, gfp_mask, order))
+                       if (zone_watermark_ok(zone, order, mark,
+                                   classzone_idx, alloc_flags))
+                               goto try_this_zone;
+
+                       if (zone_reclaim_mode == 0)
+                               goto this_zone_full;
+
+                       ret = zone_reclaim(zone, gfp_mask, order);
+                       switch (ret) {
+                       case ZONE_RECLAIM_NOSCAN:
+                               /* did not scan */
+                               goto try_next_zone;
+                       case ZONE_RECLAIM_FULL:
+                               /* scanned but unreclaimable */
+                               goto this_zone_full;
+                       default:
+                               /* did we reclaim enough */
+                               if (!zone_watermark_ok(zone, order, mark,
+                                               classzone_idx, alloc_flags))
                                        goto this_zone_full;
                        }
                }
 
+try_this_zone:
                page = buffered_rmqueue(preferred_zone, zone, order,
                                                gfp_mask, migratetype);
                if (page)