From 3d99317865d3be1bb76db581ac746b4233720417 Mon Sep 17 00:00:00 2001
From: Jens Axboe <jens.axboe@oracle.com>
Date: Thu, 17 Sep 2009 19:59:14 +0200
Subject: [PATCH] --- yaml --- r: 164287 b: refs/heads/master c:
 87c6a9b253520b66e7f5e8f67a37a701eaa51cee h: refs/heads/master i:   164285:
 7aeb80f4e1cda6fe20d65ed9f9cc7059adcf59a5   164283:
 e7841df57975b6579c581d672dcb2f9347c0b997   164279:
 3112dea66915e2a8293b2cd7d133dece4e85aedd   164271:
 039f0a0a1d64f789314f839d4794c666a65abf8c   164255:
 b4debc9f8c5b5d3610cb8c0bd050a83821313613   164223:
 9e9be005830e1ebd6c19e2449e687ae1d492254a v: v3

---
 [refs]                    |  2 +-
 trunk/mm/page-writeback.c | 11 ++++++++++-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/[refs] b/[refs]
index 95dd519cb8ab..68aec296fb83 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 3542a5c0de3d5b33227214a692bf9b12e249078e
+refs/heads/master: 87c6a9b253520b66e7f5e8f67a37a701eaa51cee
diff --git a/trunk/mm/page-writeback.c b/trunk/mm/page-writeback.c
index 2585349469e0..d1ba46441053 100644
--- a/trunk/mm/page-writeback.c
+++ b/trunk/mm/page-writeback.c
@@ -485,6 +485,7 @@ static void balance_dirty_pages(struct address_space *mapping)
 	unsigned long bdi_thresh;
 	unsigned long pages_written = 0;
 	unsigned long write_chunk = sync_writeback_pages();
+	unsigned long pause = 1;
 
 	struct backing_dev_info *bdi = mapping->backing_dev_info;
 
@@ -561,7 +562,15 @@ static void balance_dirty_pages(struct address_space *mapping)
 		if (pages_written >= write_chunk)
 			break;		/* We've done our duty */
 
-		schedule_timeout_interruptible(1);
+		schedule_timeout_interruptible(pause);
+
+		/*
+		 * Increase the delay for each loop, up to our previous
+		 * default of taking a 100ms nap.
+		 */
+		pause <<= 1;
+		if (pause > HZ / 10)
+			pause = HZ / 10;
 	}
 
 	if (bdi_nr_reclaimable + bdi_nr_writeback < bdi_thresh &&