diff --git a/[refs] b/[refs]
index 230df635b281..9fb2d1f08c8f 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: b5048a6cb5455a16bdff26a4c5ae9534f070d94c
+refs/heads/master: 603320239fb436f175c8b6bfa43d5023c47a6dc2
diff --git a/trunk/include/trace/events/writeback.h b/trunk/include/trace/events/writeback.h
index 84ab72df953c..f345f66ae9d1 100644
--- a/trunk/include/trace/events/writeback.h
+++ b/trunk/include/trace/events/writeback.h
@@ -81,6 +81,8 @@ DEFINE_EVENT(writeback_class, name, \
 	TP_ARGS(bdi))
 
 DEFINE_WRITEBACK_EVENT(writeback_nowork);
+DEFINE_WRITEBACK_EVENT(writeback_wake_thread);
+DEFINE_WRITEBACK_EVENT(writeback_wake_forker_thread);
 DEFINE_WRITEBACK_EVENT(writeback_bdi_register);
 DEFINE_WRITEBACK_EVENT(writeback_bdi_unregister);
 DEFINE_WRITEBACK_EVENT(writeback_thread_start);
diff --git a/trunk/mm/backing-dev.c b/trunk/mm/backing-dev.c
index 99890831d557..9008c4e207f6 100644
--- a/trunk/mm/backing-dev.c
+++ b/trunk/mm/backing-dev.c
@@ -310,6 +310,7 @@ static void wakeup_timer_fn(unsigned long data)
 
 	spin_lock_bh(&bdi->wb_lock);
 	if (bdi->wb.task) {
+		trace_writeback_wake_thread(bdi);
 		wake_up_process(bdi->wb.task);
 	} else {
 		/*
@@ -317,6 +318,7 @@ static void wakeup_timer_fn(unsigned long data)
 		 * In this case we have to wake-up the forker thread which
 		 * should create and run the bdi thread.
 		 */
+		trace_writeback_wake_forker_thread(bdi);
 		wake_up_process(default_backing_dev_info.wb.task);
 	}
 	spin_unlock_bh(&bdi->wb_lock);