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| author | Ming Lei <ming.lei@canonical.com> | 2015-10-20 23:13:55 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-10-21 15:00:54 -0600 |
| commit | 7460d389c01741f0dfff733af93d3b3abd9b974e (patch) | |
| tree | ec3904b3fab8e38bb5b2c583cdde993ef2d7f451 /block | |
| parent | e18378a60e27ad7b3e11ecc4e2c92159585dee68 (diff) | |
| download | linux-7460d389c01741f0dfff733af93d3b3abd9b974e.tar.gz | |
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 <ming.lei@canonical.com> Reviewed-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/elevator.c | 2 |
1 files changed, 1 insertions, 1 deletions
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; /* |