[PATCH 19/47] writeback: fix increasement of nr_dirtied_pause

[Wu Fengguang]

Fix a bug that

	current->nr_dirtied_pause += current->nr_dirtied_pause >> 5;

does not effectively increase nr_dirtied_pause when it's less than 32.
Thus nr_dirtied_pause may never grow up.

Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
---
 mm/page-writeback.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next.orig/mm/page-writeback.c	2010-12-08 22:44:27.000000000 +0800
+++ linux-next/mm/page-writeback.c	2010-12-08 22:44:28.000000000 +0800
@@ -700,7 +700,7 @@ pause:
 	if (pause == 0 && nr_dirty < background_thresh)
 		current->nr_dirtied_pause = ratelimit_pages(bdi);
 	else if (pause == 1)
-		current->nr_dirtied_pause += current->nr_dirtied_pause >> 5;
+		current->nr_dirtied_pause += current->nr_dirtied_pause / 32 + 1;
 	else if (pause >= HZ/10)
 		/*
 		 * when repeated, writing 1 page per 100ms on slow devices,


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