Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux

[mv-sheeva.git] / mm / page-writeback.c

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 45d36f7dc1697e5341691b3c1ee4cdc1cc89b256..a3278f005230a07ac5bf42717ae55bfb114f0239 100644 (file)
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -12,7 +12,7 @@
  */
 
 #include <linux/kernel.h>
-#include <linux/module.h>
+#include <linux/export.h>
 #include <linux/spinlock.h>
 #include <linux/fs.h>
 #include <linux/mm.h>
@@ -251,7 +251,9 @@ static void bdi_writeout_fraction(struct backing_dev_info *bdi,
 }
 
 /*
- *
+ * bdi_min_ratio keeps the sum of the minimum dirty shares of all
+ * registered backing devices, which, for obvious reasons, can not
+ * exceed 100%.
  */
 static unsigned int bdi_min_ratio;
 
@@ -1095,13 +1097,13 @@ static void balance_dirty_pages(struct address_space *mapping,
                pos_ratio = bdi_position_ratio(bdi, dirty_thresh,
                                               background_thresh, nr_dirty,
                                               bdi_thresh, bdi_dirty);
-               if (unlikely(pos_ratio == 0)) {
+               task_ratelimit = ((u64)dirty_ratelimit * pos_ratio) >>
+                                                       RATELIMIT_CALC_SHIFT;
+               if (unlikely(task_ratelimit == 0)) {
                        pause = max_pause;
                        goto pause;
                }
-               task_ratelimit = (u64)dirty_ratelimit *
-                                       pos_ratio >> RATELIMIT_CALC_SHIFT;
-               pause = (HZ * pages_dirtied) / (task_ratelimit | 1);
+               pause = HZ * pages_dirtied / task_ratelimit;
                if (unlikely(pause <= 0)) {
                        trace_balance_dirty_pages(bdi,
                                                  dirty_thresh,
@@ -1301,7 +1303,8 @@ void laptop_mode_timer_fn(unsigned long data)
         * threshold
         */
        if (bdi_has_dirty_io(&q->backing_dev_info))
-               bdi_start_writeback(&q->backing_dev_info, nr_pages);
+               bdi_start_writeback(&q->backing_dev_info, nr_pages,
+                                       WB_REASON_LAPTOP_TIMER);
 }
 
 /*