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block: introduce bvec_nth_page()

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Single-page bvec can often be seen in small BS workloads, so
introduce bvec_nth_page() for avoiding to call nth_page() unnecessarily,
which looks not cheap.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei
2019-02-27 20:40:10 +08:00
committed by Jens Axboe
parent 81214bab58
commit 4d633062c1
2 changed files with 9 additions and 4 deletions
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block/blk-merge.c
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@@ -483,7 +483,7 @@ static unsigned blk_bvec_map_sg(struct request_queue *q,
offset = (total + bvec->bv_offset) % PAGE_SIZE;
idx = (total + bvec->bv_offset) / PAGE_SIZE;
pg = nth_page(bvec->bv_page, idx);
pg = bvec_nth_page(bvec->bv_page, idx);
sg_set_page(*sg, pg, seg_size, offset);