Revert "block: improve queue_should_plug() by looking at IO depths"

This reverts commit fb1e75389bd06fd5987e9cda1b4e0305c782f854.

"Benjamin S." <sbenni@gmx.de> reports that the patch in question
causes a big drop in sequential throughput for him, dropping from
200MB/sec down to only 70MB/sec.

Needs to be investigated more fully, for now lets just revert the
offending commit.

Conflicts:

	include/linux/blkdev.h

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 2 insertions, 9 deletions

diff --git a/block/blk-core.c b/block/blk-core.c
index 718897e6d37f..d1a9a0a64f95 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1147,7 +1147,7 @@ void init_request_from_bio(struct request *req, struct bio *bio)
  */
 static inline bool queue_should_plug(struct request_queue *q)
 {
-        return !(blk_queue_nonrot(q) && blk_queue_queuing(q));
+        return !(blk_queue_nonrot(q) && blk_queue_tagged(q));
 }
 
 static int __make_request(struct request_queue *q, struct bio *bio)
@@ -1859,15 +1859,8 @@ void blk_dequeue_request(struct request *rq)
          * and to it is freed is accounted as io that is in progress at
          * the driver side.
          */
-        if (blk_account_rq(rq)) {
+        if (blk_account_rq(rq))
                 q->in_flight[rq_is_sync(rq)]++;
-                /*
-                 * Mark this device as supporting hardware queuing, if
-                 * we have more IOs in flight than 4.
-                 */
-                if (!blk_queue_queuing(q) && queue_in_flight(q) > 4)
-                        set_bit(QUEUE_FLAG_CQ, &q->queue_flags);
-        }
 }
 
 /**