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authorJens Axboe <jens.axboe@oracle.com>2009-04-06 08:48:01 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-06 11:04:53 -0400
commit1faa16d22877f4839bd433547d770c676d1d964c (patch)
tree9a0d50be1ef0358c1f53d7107413100904e7d526 /block/elevator.c
parent0221c81b1b8eb0cbb6b30a0ced52ead32d2b4e4c (diff)
block: change the request allocation/congestion logic to be sync/async based
This makes sure that we never wait on async IO for sync requests, instead of doing the split on writes vs reads. Signed-off-by: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'block/elevator.c')
-rw-r--r--block/elevator.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/block/elevator.c b/block/elevator.c
index 98259eda0ef6..ca6788a0195a 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -677,7 +677,7 @@ void elv_insert(struct request_queue *q, struct request *rq, int where)
677 } 677 }
678 678
679 if (unplug_it && blk_queue_plugged(q)) { 679 if (unplug_it && blk_queue_plugged(q)) {
680 int nrq = q->rq.count[READ] + q->rq.count[WRITE] 680 int nrq = q->rq.count[BLK_RW_SYNC] + q->rq.count[BLK_RW_ASYNC]
681 - q->in_flight; 681 - q->in_flight;
682 682
683 if (nrq >= q->unplug_thresh) 683 if (nrq >= q->unplug_thresh)