kconfig: fix default value for choice input

[pandora-kernel.git] / mm / page-writeback.c

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index c1052ee..6dcce3a 100644 (file)
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -256,8 +256,9 @@ static void balance_dirty_pages(struct address_space *mapping)
 }
 
 /**
- * balance_dirty_pages_ratelimited - balance dirty memory state
+ * balance_dirty_pages_ratelimited_nr - balance dirty memory state
  * @mapping: address_space which was dirtied
+ * @nr_pages_dirtied: number of pages which the caller has just dirtied
  *
  * Processes which are dirtying memory should call in here once for each page
  * which was newly dirtied.  The function will periodically check the system's
@@ -268,10 +269,12 @@ static void balance_dirty_pages(struct address_space *mapping)
  * limit we decrease the ratelimiting by a lot, to prevent individual processes
  * from overshooting the limit by (ratelimit_pages) each.
  */
-void balance_dirty_pages_ratelimited(struct address_space *mapping)
+void balance_dirty_pages_ratelimited_nr(struct address_space *mapping,
+                                       unsigned long nr_pages_dirtied)
 {
-       static DEFINE_PER_CPU(int, ratelimits) = 0;
-       long ratelimit;
+       static DEFINE_PER_CPU(unsigned long, ratelimits) = 0;
+       unsigned long ratelimit;
+       unsigned long *p;
 
        ratelimit = ratelimit_pages;
        if (dirty_exceeded)
@@ -281,15 +284,18 @@ void balance_dirty_pages_ratelimited(struct address_space *mapping)
         * Check the rate limiting. Also, we do not want to throttle real-time
         * tasks in balance_dirty_pages(). Period.
         */
-       if (get_cpu_var(ratelimits)++ >= ratelimit) {
-               __get_cpu_var(ratelimits) = 0;
-               put_cpu_var(ratelimits);
+       preempt_disable();
+       p =  &__get_cpu_var(ratelimits);
+       *p += nr_pages_dirtied;
+       if (unlikely(*p >= ratelimit)) {
+               *p = 0;
+               preempt_enable();
                balance_dirty_pages(mapping);
                return;
        }
-       put_cpu_var(ratelimits);
+       preempt_enable();
 }
-EXPORT_SYMBOL(balance_dirty_pages_ratelimited);
+EXPORT_SYMBOL(balance_dirty_pages_ratelimited_nr);
 
 void throttle_vm_writeout(void)
 {
@@ -622,8 +628,6 @@ EXPORT_SYMBOL(write_one_page);
  */
 int __set_page_dirty_nobuffers(struct page *page)
 {
-       int ret = 0;
-
        if (!TestSetPageDirty(page)) {
                struct address_space *mapping = page_mapping(page);
                struct address_space *mapping2;
@@ -645,8 +649,9 @@ int __set_page_dirty_nobuffers(struct page *page)
                                                        I_DIRTY_PAGES);
                        }
                }
+               return 1;
        }
-       return ret;
+       return 0;
 }
 EXPORT_SYMBOL(__set_page_dirty_nobuffers);
 
@@ -676,8 +681,10 @@ int fastcall set_page_dirty(struct page *page)
                        return (*spd)(page);
                return __set_page_dirty_buffers(page);
        }
-       if (!PageDirty(page))
-               SetPageDirty(page);
+       if (!PageDirty(page)) {
+               if (!TestSetPageDirty(page))
+                       return 1;
+       }
        return 0;
 }
 EXPORT_SYMBOL(set_page_dirty);