zonelists: handle a node zonelist with no applicable entries

[linux-2.6-omap-h63xx.git] / mm / page_alloc.c

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6965be064a31f2977a64c60a6e8ca59fd0e01912..7f4c66ff65b796a840086301eccf2c9c94044076 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -45,6 +45,7 @@
 #include <linux/fault-inject.h>
 #include <linux/page-isolation.h>
 #include <linux/memcontrol.h>
+#include <linux/debugobjects.h>
 
 #include <asm/tlbflush.h>
 #include <asm/div64.h>
@@ -532,8 +533,11 @@ static void __free_pages_ok(struct page *page, unsigned int order)
        if (reserved)
                return;
 
-       if (!PageHighMem(page))
+       if (!PageHighMem(page)) {
                debug_check_no_locks_freed(page_address(page),PAGE_SIZE<<order);
+               debug_check_no_obj_freed(page_address(page),
+                                          PAGE_SIZE << order);
+       }
        arch_free_page(page, order);
        kernel_map_pages(page, 1 << order, 0);
 
@@ -995,8 +999,10 @@ static void free_hot_cold_page(struct page *page, int cold)
        if (free_pages_check(page))
                return;
 
-       if (!PageHighMem(page))
+       if (!PageHighMem(page)) {
                debug_check_no_locks_freed(page_address(page), PAGE_SIZE);
+               debug_check_no_obj_freed(page_address(page), PAGE_SIZE);
+       }
        arch_free_page(page, 0);
        kernel_map_pages(page, 1, 0);
 
@@ -1390,6 +1396,9 @@ get_page_from_freelist(gfp_t gfp_mask, nodemask_t *nodemask, unsigned int order,
 
        (void)first_zones_zonelist(zonelist, high_zoneidx, nodemask,
                                                        &preferred_zone);
+       if (!preferred_zone)
+               return NULL;
+
        classzone_idx = zone_idx(preferred_zone);
 
 zonelist_scan:
@@ -1461,7 +1470,8 @@ __alloc_pages_internal(gfp_t gfp_mask, unsigned int order,
        struct task_struct *p = current;
        int do_retry;
        int alloc_flags;
-       int did_some_progress;
+       unsigned long did_some_progress;
+       unsigned long pages_reclaimed = 0;
 
        might_sleep_if(wait);
 
@@ -1611,15 +1621,26 @@ nofail_alloc:
         * Don't let big-order allocations loop unless the caller explicitly
         * requests that.  Wait for some write requests to complete then retry.
         *
-        * In this implementation, either order <= PAGE_ALLOC_COSTLY_ORDER or
-        * __GFP_REPEAT mean __GFP_NOFAIL, but that may not be true in other
+        * In this implementation, order <= PAGE_ALLOC_COSTLY_ORDER
+        * means __GFP_NOFAIL, but that may not be true in other
         * implementations.
+        *
+        * For order > PAGE_ALLOC_COSTLY_ORDER, if __GFP_REPEAT is
+        * specified, then we retry until we no longer reclaim any pages
+        * (above), or we've reclaimed an order of pages at least as
+        * large as the allocation's order. In both cases, if the
+        * allocation still fails, we stop retrying.
         */
+       pages_reclaimed += did_some_progress;
        do_retry = 0;
        if (!(gfp_mask & __GFP_NORETRY)) {
-               if ((order <= PAGE_ALLOC_COSTLY_ORDER) ||
-                                               (gfp_mask & __GFP_REPEAT))
+               if (order <= PAGE_ALLOC_COSTLY_ORDER) {
                        do_retry = 1;
+               } else {
+                       if (gfp_mask & __GFP_REPEAT &&
+                               pages_reclaimed < (1 << order))
+                                       do_retry = 1;
+               }
                if (gfp_mask & __GFP_NOFAIL)
                        do_retry = 1;
        }
@@ -2844,8 +2865,6 @@ __meminit int init_currently_empty_zone(struct zone *zone,
 
        zone->zone_start_pfn = zone_start_pfn;
 
-       memmap_init(size, pgdat->node_id, zone_idx(zone), zone_start_pfn);
-
        zone_init_free_lists(zone);
 
        return 0;
@@ -3362,7 +3381,8 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat,
                 * is used by this zone for memmap. This affects the watermark
                 * and per-cpu initialisations
                 */
-               memmap_pages = (size * sizeof(struct page)) >> PAGE_SHIFT;
+               memmap_pages =
+                       PAGE_ALIGN(size * sizeof(struct page)) >> PAGE_SHIFT;
                if (realsize >= memmap_pages) {
                        realsize -= memmap_pages;
                        printk(KERN_DEBUG
@@ -3415,6 +3435,7 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat,
                ret = init_currently_empty_zone(zone, zone_start_pfn,
                                                size, MEMMAP_EARLY);
                BUG_ON(ret);
+               memmap_init(size, nid, j, zone_start_pfn);
                zone_start_pfn += size;
        }
 }