From 4722dc52a891ab6cb2d637ddb87233e0ce277827 Mon Sep 17 00:00:00 2001
From: "Alan D. Brunelle" <Alan.Brunelle@hp.com>
Date: Tue, 27 May 2008 14:55:00 +0200
Subject: [PATCH] Added in elevator switch message to blktrace stream

Signed-off-by: Alan D. Brunelle <alan.brunelle@hp.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---
 block/elevator.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/block/elevator.c b/block/elevator.c
index 980f8ae147b4..902dd1344d56 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -1110,6 +1110,8 @@ static int elevator_switch(struct request_queue *q, struct elevator_type *new_e)
 	queue_flag_clear(QUEUE_FLAG_ELVSWITCH, q);
 	spin_unlock_irq(q->queue_lock);
 
+	blk_add_trace_msg(q, "elv switch: %s", e->elevator_type->elevator_name);
+
 	return 1;
 
 fail_register: