Merge branch 'writeback' of git://git.kernel.dk/linux-2.6-block

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

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 613e89f..64e4388 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -663,7 +663,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
                 * processes. Try to unmap it here.
                 */
                if (page_mapped(page) && mapping) {
-                       switch (try_to_unmap(page, 0)) {
+                       switch (try_to_unmap(page, TTU_UNMAP)) {
                        case SWAP_FAIL:
                                goto activate_locked;
                        case SWAP_AGAIN:
@@ -1709,10 +1709,10 @@ static void shrink_zones(int priority, struct zonelist *zonelist,
  *
  * If the caller is !__GFP_FS then the probability of a failure is reasonably
  * high - the zone may be full of dirty or under-writeback pages, which this
- * caller can't do much about.  We kick pdflush and take explicit naps in the
- * hope that some of these pages can be written.  But if the allocating task
- * holds filesystem locks which prevent writeout this might not work, and the
- * allocation attempt will fail.
+ * caller can't do much about.  We kick the writeback threads and take explicit
+ * naps in the hope that some of these pages can be written.  But if the
+ * allocating task holds filesystem locks which prevent writeout this might not
+ * work, and the allocation attempt will fail.
  *
  * returns:    0, if no pages reclaimed
  *             else, the number of pages reclaimed
@@ -1836,11 +1836,45 @@ unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
 
 #ifdef CONFIG_CGROUP_MEM_RES_CTLR
 
+unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *mem,
+                                               gfp_t gfp_mask, bool noswap,
+                                               unsigned int swappiness,
+                                               struct zone *zone, int nid)
+{
+       struct scan_control sc = {
+               .may_writepage = !laptop_mode,
+               .may_unmap = 1,
+               .may_swap = !noswap,
+               .swap_cluster_max = SWAP_CLUSTER_MAX,
+               .swappiness = swappiness,
+               .order = 0,
+               .mem_cgroup = mem,
+               .isolate_pages = mem_cgroup_isolate_pages,
+       };
+       nodemask_t nm  = nodemask_of_node(nid);
+
+       sc.gfp_mask = (gfp_mask & GFP_RECLAIM_MASK) |
+                       (GFP_HIGHUSER_MOVABLE & ~GFP_RECLAIM_MASK);
+       sc.nodemask = &nm;
+       sc.nr_reclaimed = 0;
+       sc.nr_scanned = 0;
+       /*
+        * NOTE: Although we can get the priority field, using it
+        * here is not a good idea, since it limits the pages we can scan.
+        * if we don't reclaim here, the shrink_zone from balance_pgdat
+        * will pick up pages from other mem cgroup's as well. We hack
+        * the priority and make it zero.
+        */
+       shrink_zone(0, zone, &sc);
+       return sc.nr_reclaimed;
+}
+
 unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem_cont,
                                           gfp_t gfp_mask,
                                           bool noswap,
                                           unsigned int swappiness)
 {
+       struct zonelist *zonelist;
        struct scan_control sc = {
                .may_writepage = !laptop_mode,
                .may_unmap = 1,
@@ -1852,7 +1886,6 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem_cont,
                .isolate_pages = mem_cgroup_isolate_pages,
                .nodemask = NULL, /* we don't care the placement */
        };
-       struct zonelist *zonelist;
 
        sc.gfp_mask = (gfp_mask & GFP_RECLAIM_MASK) |
                        (GFP_HIGHUSER_MOVABLE & ~GFP_RECLAIM_MASK);
@@ -1974,6 +2007,7 @@ loop_again:
                for (i = 0; i <= end_zone; i++) {
                        struct zone *zone = pgdat->node_zones + i;
                        int nr_slab;
+                       int nid, zid;
 
                        if (!populated_zone(zone))
                                continue;
@@ -1988,6 +2022,15 @@ loop_again:
                        temp_priority[i] = priority;
                        sc.nr_scanned = 0;
                        note_zone_scanning_priority(zone, priority);
+
+                       nid = pgdat->node_id;
+                       zid = zone_idx(zone);
+                       /*
+                        * Call soft limit reclaim before calling shrink_zone.
+                        * For now we ignore the return value
+                        */
+                       mem_cgroup_soft_limit_reclaim(zone, order, sc.gfp_mask,
+                                                       nid, zid);
                        /*
                         * We put equal pressure on every zone, unless one
                         * zone has way too many pages free already.
@@ -2801,10 +2844,10 @@ static void scan_all_zones_unevictable_pages(void)
 unsigned long scan_unevictable_pages;
 
 int scan_unevictable_handler(struct ctl_table *table, int write,
-                          struct file *file, void __user *buffer,
+                          void __user *buffer,
                           size_t *length, loff_t *ppos)
 {
-       proc_doulongvec_minmax(table, write, file, buffer, length, ppos);
+       proc_doulongvec_minmax(table, write, buffer, length, ppos);
 
        if (write && *(unsigned long *)table->data)
                scan_all_zones_unevictable_pages();