mm: page allocator: calculate a better estimate of NR_FREE_PAGES when memory is low...

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

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a9649f4..b2d21e0 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -588,13 +588,13 @@ static void free_pcppages_bulk(struct zone *zone, int count,
 {
        int migratetype = 0;
        int batch_free = 0;
+       int to_free = count;
 
        spin_lock(&zone->lock);
        zone->all_unreclaimable = 0;
        zone->pages_scanned = 0;
 
-       __mod_zone_page_state(zone, NR_FREE_PAGES, count);
-       while (count) {
+       while (to_free) {
                struct page *page;
                struct list_head *list;
 
@@ -619,8 +619,9 @@ static void free_pcppages_bulk(struct zone *zone, int count,
                        /* MIGRATE_MOVABLE list may include MIGRATE_RESERVEs */
                        __free_one_page(page, zone, 0, page_private(page));
                        trace_mm_page_pcpu_drain(page, 0, page_private(page));
-               } while (--count && --batch_free && !list_empty(list));
+               } while (--to_free && --batch_free && !list_empty(list));
        }
+       __mod_zone_page_state(zone, NR_FREE_PAGES, count);
        spin_unlock(&zone->lock);
 }
 
@@ -631,8 +632,8 @@ static void free_one_page(struct zone *zone, struct page *page, int order,
        zone->all_unreclaimable = 0;
        zone->pages_scanned = 0;
 
-       __mod_zone_page_state(zone, NR_FREE_PAGES, 1 << order);
        __free_one_page(page, zone, order, migratetype);
+       __mod_zone_page_state(zone, NR_FREE_PAGES, 1 << order);
        spin_unlock(&zone->lock);
 }
 
@@ -1461,7 +1462,7 @@ int zone_watermark_ok(struct zone *z, int order, unsigned long mark,
 {
        /* free_pages my go negative - that's OK */
        long min = mark;
-       long free_pages = zone_page_state(z, NR_FREE_PAGES) - (1 << order) + 1;
+       long free_pages = zone_nr_free_pages(z) - (1 << order) + 1;
        int o;
 
        if (alloc_flags & ALLOC_HIGH)
@@ -2423,7 +2424,7 @@ void show_free_areas(void)
                        " all_unreclaimable? %s"
                        "\n",
                        zone->name,
-                       K(zone_page_state(zone, NR_FREE_PAGES)),
+                       K(zone_nr_free_pages(zone)),
                        K(min_wmark_pages(zone)),
                        K(low_wmark_pages(zone)),
                        K(high_wmark_pages(zone)),