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| author | Johannes Thumshirn <jthumshirn@suse.de> | 2018-11-07 14:58:14 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-11-07 13:04:22 -0700 |
| commit | df376b2ed51a2777c3398e038992f62523c0f932 (patch) | |
| tree | 18169f272490df584b3b9ed7ebe6736368c69f19 /block | |
| parent | 9fe5c59ff6a1e5e26a39b75489a1420e7eaaf0b1 (diff) | |
| download | linux-stable-df376b2ed51a2777c3398e038992f62523c0f932.tar.gz linux-stable-df376b2ed51a2777c3398e038992f62523c0f932.tar.bz2 linux-stable-df376b2ed51a2777c3398e038992f62523c0f932.zip | |
block: respect virtual boundary mask in bvecs
With drivers that are settting a virtual boundary constrain, we are
seeing a lot of bio splitting and smaller I/Os being submitted to the
driver.
This happens because the bio gap detection code does not account cases
where PAGE_SIZE - 1 is bigger than queue_virt_boundary() and thus will
split the bio unnecessarily.
Cc: Jan Kara <jack@suse.cz>
Cc: Bart Van Assche <bvanassche@acm.org>
Cc: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Acked-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-merge.c | 2 | ||||
| -rw-r--r-- | block/blk.h | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/block/blk-merge.c b/block/blk-merge.c index 6b5ad275ed56..208658a901c6 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -46,7 +46,7 @@ static inline bool bio_will_gap(struct request_queue *q, bio_get_first_bvec(prev_rq->bio, &pb); else bio_get_first_bvec(prev, &pb); - if (pb.bv_offset) + if (pb.bv_offset & queue_virt_boundary(q)) return true; /* diff --git a/block/blk.h b/block/blk.h index a1841b8ff129..c85e53f21cdd 100644 --- a/block/blk.h +++ b/block/blk.h @@ -169,7 +169,7 @@ static inline bool biovec_phys_mergeable(struct request_queue *q, static inline bool __bvec_gap_to_prev(struct request_queue *q, struct bio_vec *bprv, unsigned int offset) { - return offset || + return (offset & queue_virt_boundary(q)) || ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q)); } |