Merge branch 'rmobile/dma' into rmobile-fixes-for-linus

[pandora-kernel.git] / include / linux / writeback.h

diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index b625073..f1bfa12 100644 (file)
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -8,6 +8,10 @@
 #include <linux/fs.h>
 
 /*
+ * The 1/4 region under the global dirty thresh is for smooth dirty throttling:
+ *
+ *     (thresh - thresh/DIRTY_FULL_SCOPE, thresh)
+ *
  * The 1/16 region above the global dirty limit will be put to maximum pauses:
  *
  *     (limit, limit + limit/DIRTY_MAXPAUSE_AREA)
@@ -25,9 +29,16 @@
  * knocks down the global dirty threshold quickly, in which case the global
  * dirty limit will follow down slowly to prevent livelocking all dirtier tasks.
  */
+#define DIRTY_SCOPE            8
+#define DIRTY_FULL_SCOPE       (DIRTY_SCOPE / 2)
 #define DIRTY_MAXPAUSE_AREA            16
 #define DIRTY_PASSGOOD_AREA            8
 
+/*
+ * 4MB minimal write chunk size
+ */
+#define MIN_WRITEBACK_PAGES    (4096UL >> (PAGE_CACHE_SHIFT - 10))
+
 struct backing_dev_info;
 
 /*