[PATCH] sched: fix interactive task starvation

[linux-2.6-omap-h63xx.git] / block / elevator.c

diff --git a/block/elevator.c b/block/elevator.c
index db3d0d8296a05c908f5dd38100593217c8c7d114..0d6be03d929ea348423f8abf4a222f7c699d4e3b 100644 (file)
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -33,6 +33,7 @@
 #include <linux/init.h>
 #include <linux/compiler.h>
 #include <linux/delay.h>
+#include <linux/blktrace_api.h>
 
 #include <asm/uaccess.h>
 
@@ -144,7 +145,7 @@ static int __init elevator_setup(char *str)
                strcpy(chosen_elevator, "anticipatory");
        else
                strncpy(chosen_elevator, str, sizeof(chosen_elevator) - 1);
-       return 0;
+       return 1;
 }
 
 __setup("elevator=", elevator_setup);
@@ -333,6 +334,8 @@ void elv_insert(request_queue_t *q, struct request *rq, int where)
        struct list_head *pos;
        unsigned ordseq;
 
+       blk_add_trace_rq(q, rq, BLK_TA_INSERT);
+
        rq->q = q;
 
        switch (where) {
@@ -499,6 +502,7 @@ struct request *elv_next_request(request_queue_t *q)
                         * not be passed by new incoming requests
                         */
                        rq->flags |= REQ_STARTED;
+                       blk_add_trace_rq(q, rq, BLK_TA_ISSUE);
                }
 
                if (!q->boundary_rq || q->boundary_rq == rq) {
@@ -724,8 +728,7 @@ void elv_unregister_queue(struct request_queue *q)
 int elv_register(struct elevator_type *e)
 {
        spin_lock_irq(&elv_list_lock);
-       if (elevator_find(e->elevator_name))
-               BUG();
+       BUG_ON(elevator_find(e->elevator_name));
        list_add_tail(&e->list, &elv_list);
        spin_unlock_irq(&elv_list_lock);