Merge tag 'v2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

[mv-sheeva.git] / mm / vmscan.c

diff --git a/mm/vmscan.c b/mm/vmscan.c
index f5d90dedebbafab2235c6d408a371d40e52d4e54..6771ea70bfe7e399d96237a58d3860357aad4c46 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1841,16 +1841,28 @@ static inline bool should_continue_reclaim(struct zone *zone,
        if (!(sc->reclaim_mode & RECLAIM_MODE_COMPACTION))
                return false;
 
-       /*
-        * If we failed to reclaim and have scanned the full list, stop.
-        * NOTE: Checking just nr_reclaimed would exit reclaim/compaction far
-        *       faster but obviously would be less likely to succeed
-        *       allocation. If this is desirable, use GFP_REPEAT to decide
-        *       if both reclaimed and scanned should be checked or just
-        *       reclaimed
-        */
-       if (!nr_reclaimed && !nr_scanned)
-               return false;
+       /* Consider stopping depending on scan and reclaim activity */
+       if (sc->gfp_mask & __GFP_REPEAT) {
+               /*
+                * For __GFP_REPEAT allocations, stop reclaiming if the
+                * full LRU list has been scanned and we are still failing
+                * to reclaim pages. This full LRU scan is potentially
+                * expensive but a __GFP_REPEAT caller really wants to succeed
+                */
+               if (!nr_reclaimed && !nr_scanned)
+                       return false;
+       } else {
+               /*
+                * For non-__GFP_REPEAT allocations which can presumably
+                * fail without consequence, stop if we failed to reclaim
+                * any pages from the last SWAP_CLUSTER_MAX number of
+                * pages that were scanned. This will return to the
+                * caller faster at the risk reclaim/compaction and
+                * the resulting allocation attempt fails
+                */
+               if (!nr_reclaimed)
+                       return false;
+       }
 
        /*
         * If we have not reclaimed enough pages for compaction and the
@@ -1882,12 +1894,12 @@ static void shrink_zone(int priority, struct zone *zone,
        unsigned long nr[NR_LRU_LISTS];
        unsigned long nr_to_scan;
        enum lru_list l;
-       unsigned long nr_reclaimed;
+       unsigned long nr_reclaimed, nr_scanned;
        unsigned long nr_to_reclaim = sc->nr_to_reclaim;
-       unsigned long nr_scanned = sc->nr_scanned;
 
 restart:
        nr_reclaimed = 0;
+       nr_scanned = sc->nr_scanned;
        get_scan_count(zone, sc, nr, priority);
 
        while (nr[LRU_INACTIVE_ANON] || nr[LRU_ACTIVE_FILE] ||
@@ -2083,7 +2095,8 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
                        struct zone *preferred_zone;
 
                        first_zones_zonelist(zonelist, gfp_zone(sc->gfp_mask),
-                                                       NULL, &preferred_zone);
+                                               &cpuset_current_mems_allowed,
+                                               &preferred_zone);
                        wait_iff_congested(preferred_zone, BLK_RW_ASYNC, HZ/10);
                }
        }