dm zoned: check superblock location

[linux-2.6-microblaze.git] / mm / page_alloc.c

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 114c56c..13cc653 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -103,8 +103,8 @@ struct pcpu_drain {
        struct zone *zone;
        struct work_struct work;
 };
-DEFINE_MUTEX(pcpu_drain_mutex);
-DEFINE_PER_CPU(struct pcpu_drain, pcpu_drain);
+static DEFINE_MUTEX(pcpu_drain_mutex);
+static DEFINE_PER_CPU(struct pcpu_drain, pcpu_drain);
 
 #ifdef CONFIG_GCC_PLUGIN_LATENT_ENTROPY
 volatile unsigned long latent_entropy __latent_entropy;
@@ -1607,6 +1607,7 @@ void set_zone_contiguous(struct zone *zone)
                if (!__pageblock_pfn_to_page(block_start_pfn,
                                             block_end_pfn, zone))
                        return;
+               cond_resched();
        }
 
        /* We confirm that there is no hole */
@@ -2400,6 +2401,14 @@ static inline void boost_watermark(struct zone *zone)
 
        if (!watermark_boost_factor)
                return;
+       /*
+        * Don't bother in zones that are unlikely to produce results.
+        * On small machines, including kdump capture kernels running
+        * in a small area, boosting the watermark can cause an out of
+        * memory situation immediately.
+        */
+       if ((pageblock_nr_pages * 4) > zone_managed_pages(zone))
+               return;
 
        max_boost = mult_frac(zone->_watermark[WMARK_HIGH],
                        watermark_boost_factor, 10000);
@@ -3224,6 +3233,7 @@ int __isolate_free_page(struct page *page, unsigned int order)
  * __putback_isolated_page - Return a now-isolated page back where we got it
  * @page: Page that was isolated
  * @order: Order of the isolated page
+ * @mt: The page's pageblock's migratetype
  *
  * This function is meant to return a page pulled from the free lists via
  * __isolate_free_page back to the free lists they were pulled from.