Merge head 'drm-via' of master.kernel.org:/pub/scm/linux/kernel/git/airlied/drm-2.6

[pandora-kernel.git] / mm / vmscan.c

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 6379ddb..cfffe50 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -900,7 +900,9 @@ shrink_caches(struct zone **zones, struct scan_control *sc)
                if (zone->all_unreclaimable && sc->priority != DEF_PRIORITY)
                        continue;       /* Let kswapd poll it */
 
+               atomic_inc(&zone->reclaim_in_progress);
                shrink_zone(zone, sc);
+               atomic_dec(&zone->reclaim_in_progress);
        }
 }
  
@@ -917,8 +919,7 @@ shrink_caches(struct zone **zones, struct scan_control *sc)
  * holds filesystem locks which prevent writeout this might not work, and the
  * allocation attempt will fail.
  */
-int try_to_free_pages(struct zone **zones,
-               unsigned int gfp_mask, unsigned int order)
+int try_to_free_pages(struct zone **zones, unsigned int gfp_mask)
 {
        int priority;
        int ret = 0;
@@ -971,7 +972,7 @@ int try_to_free_pages(struct zone **zones,
                 * writeout.  So in laptop mode, write out the whole world.
                 */
                if (total_scanned > sc.swap_cluster_max + sc.swap_cluster_max/2) {
-                       wakeup_bdflush(laptop_mode ? 0 : total_scanned);
+                       wakeup_pdflush(laptop_mode ? 0 : total_scanned);
                        sc.may_writepage = 1;
                }
 
@@ -1111,7 +1112,9 @@ scan:
                        sc.nr_reclaimed = 0;
                        sc.priority = priority;
                        sc.swap_cluster_max = nr_pages? nr_pages : SWAP_CLUSTER_MAX;
+                       atomic_inc(&zone->reclaim_in_progress);
                        shrink_zone(zone, &sc);
+                       atomic_dec(&zone->reclaim_in_progress);
                        reclaim_state->reclaimed_slab = 0;
                        nr_slab = shrink_slab(sc.nr_scanned, GFP_KERNEL,
                                                lru_pages);
@@ -1213,8 +1216,8 @@ static int kswapd(void *p)
        order = 0;
        for ( ; ; ) {
                unsigned long new_order;
-               if (current->flags & PF_FREEZE)
-                       refrigerator(PF_FREEZE);
+
+               try_to_freeze();
 
                prepare_to_wait(&pgdat->kswapd_wait, &wait, TASK_INTERRUPTIBLE);
                new_order = pgdat->kswapd_max_order;
@@ -1323,3 +1326,73 @@ static int __init kswapd_init(void)
 }
 
 module_init(kswapd_init)
+
+
+/*
+ * Try to free up some pages from this zone through reclaim.
+ */
+int zone_reclaim(struct zone *zone, unsigned int gfp_mask, unsigned int order)
+{
+       struct scan_control sc;
+       int nr_pages = 1 << order;
+       int total_reclaimed = 0;
+
+       /* The reclaim may sleep, so don't do it if sleep isn't allowed */
+       if (!(gfp_mask & __GFP_WAIT))
+               return 0;
+       if (zone->all_unreclaimable)
+               return 0;
+
+       sc.gfp_mask = gfp_mask;
+       sc.may_writepage = 0;
+       sc.may_swap = 0;
+       sc.nr_mapped = read_page_state(nr_mapped);
+       sc.nr_scanned = 0;
+       sc.nr_reclaimed = 0;
+       /* scan at the highest priority */
+       sc.priority = 0;
+
+       if (nr_pages > SWAP_CLUSTER_MAX)
+               sc.swap_cluster_max = nr_pages;
+       else
+               sc.swap_cluster_max = SWAP_CLUSTER_MAX;
+
+       /* Don't reclaim the zone if there are other reclaimers active */
+       if (!atomic_inc_and_test(&zone->reclaim_in_progress))
+               goto out;
+
+       shrink_zone(zone, &sc);
+       total_reclaimed = sc.nr_reclaimed;
+
+ out:
+       atomic_dec(&zone->reclaim_in_progress);
+       return total_reclaimed;
+}
+
+asmlinkage long sys_set_zone_reclaim(unsigned int node, unsigned int zone,
+                                    unsigned int state)
+{
+       struct zone *z;
+       int i;
+
+       if (node >= MAX_NUMNODES || !node_online(node))
+               return -EINVAL;
+
+       /* This will break if we ever add more zones */
+       if (!(zone & (1<<ZONE_DMA|1<<ZONE_NORMAL|1<<ZONE_HIGHMEM)))
+               return -EINVAL;
+
+       for (i = 0; i < MAX_NR_ZONES; i++) {
+               if (!(zone & 1<<i))
+                       continue;
+
+               z = &NODE_DATA(node)->node_zones[i];
+
+               if (state)
+                       z->reclaim_pages = 1;
+               else
+                       z->reclaim_pages = 0;
+       }
+
+       return 0;
+}