From 7460d389c01741f0dfff733af93d3b3abd9b974e Mon Sep 17 00:00:00 2001 From: Ming Lei Date: Tue, 20 Oct 2015 23:13:55 +0800 Subject: block: check bio_mergeable() early before merging After bio splitting is introduced, one bio can be splitted and it is marked as NOMERGE because it is too fat to be merged, so check bio_mergeable() earlier to avoid to try to merge it unnecessarily. Signed-off-by: Ming Lei Reviewed-by: Jeff Moyer Signed-off-by: Jens Axboe --- block/elevator.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'block') diff --git a/block/elevator.c b/block/elevator.c index 84d63943f2de..c3555c9c672f 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -420,7 +420,7 @@ int elv_merge(struct request_queue *q, struct request **req, struct bio *bio) * noxmerges: Only simple one-hit cache try * merges: All merge tries attempted */ - if (blk_queue_nomerges(q)) + if (blk_queue_nomerges(q) || !bio_mergeable(bio)) return ELEVATOR_NO_MERGE; /* -- cgit v1.2.3-58-ga151