1 files changed, 24 insertions, 5 deletions

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 28130541270f..b0cd81c32de6 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -201,13 +201,25 @@ static int shrink_slab(unsigned long scanned, gfp_t gfp_mask,
         list_for_each_entry(shrinker, &shrinker_list, list) {
                 unsigned long long delta;
                 unsigned long total_scan;
+                unsigned long max_pass = (*shrinker->shrinker)(0, gfp_mask);
 
                 delta = (4 * scanned) / shrinker->seeks;
-                delta *= (*shrinker->shrinker)(0, gfp_mask);
+                delta *= max_pass;
                 do_div(delta, lru_pages + 1);
                 shrinker->nr += delta;
-                if (shrinker->nr < 0)
-                        shrinker->nr = LONG_MAX;        /* It wrapped! */
+                if (shrinker->nr < 0) {
+                        printk(KERN_ERR "%s: nr=%ld\n",
+                                        __FUNCTION__, shrinker->nr);
+                        shrinker->nr = max_pass;
+                }
+
+                /*
+                 * Avoid risking looping forever due to too large nr value:
+                 * never try to free more than twice the estimate number of
+                 * freeable entries.
+                 */
+                if (shrinker->nr > max_pass * 2)
+                        shrinker->nr = max_pass * 2;
 
                 total_scan = shrinker->nr;
                 shrinker->nr = 0;
@@ -407,7 +419,7 @@ static int shrink_list(struct list_head *page_list, struct scan_control *sc)
                 if (PageWriteback(page))
                         goto keep_locked;
 
-                referenced = page_referenced(page, 1, sc->priority <= 0);
+                referenced = page_referenced(page, 1);
                 /* In active use or really unfreeable?  Activate it. */
                 if (referenced && page_mapping_inuse(page))
                         goto activate_locked;
@@ -756,7 +768,7 @@ refill_inactive_zone(struct zone *zone, struct scan_control *sc)
                 if (page_mapped(page)) {
                         if (!reclaim_mapped ||
                             (total_swap_pages == 0 && PageAnon(page)) ||
-                            page_referenced(page, 0, sc->priority <= 0)) {
+                            page_referenced(page, 0)) {
                                 list_add(&page->lru, &l_active);
                                 continue;
                         }
@@ -960,6 +972,8 @@ int try_to_free_pages(struct zone **zones, gfp_t gfp_mask)
                 sc.nr_reclaimed = 0;
                 sc.priority = priority;
                 sc.swap_cluster_max = SWAP_CLUSTER_MAX;
+                if (!priority)
+                        disable_swap_token();
                 shrink_caches(zones, &sc);
                 shrink_slab(sc.nr_scanned, gfp_mask, lru_pages);
                 if (reclaim_state) {
@@ -1056,6 +1070,10 @@ loop_again:
                 int end_zone = 0;       /* Inclusive.  0 = ZONE_DMA */
                 unsigned long lru_pages = 0;
 
+                /* The swap token gets in the way of swapout... */
+                if (!priority)
+                        disable_swap_token();
+
                 all_zones_ok = 1;
 
                 if (nr_pages == 0) {
@@ -1360,6 +1378,7 @@ int zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
         sc.nr_reclaimed = 0;
         /* scan at the highest priority */
         sc.priority = 0;
+        disable_swap_token();
 
         if (nr_pages > SWAP_CLUSTER_MAX)
                 sc.swap_cluster_max = nr_pages;