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block: consider discard merge last 

If the next discard range is contiguous with the current range being
considered, it's cheaper to expand the current range than to append an
additional bio.

Signed-off-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Keith Busch 2025-11-14 10:31:45 -08:00 committed by Jens Axboe
parent 82d2048102
commit 2516c246d0
1 changed files with 6 additions and 6 deletions
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12
block/blk-merge.c
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@ -712,10 +712,10 @@ static void blk_account_io_merge_request(struct request *req)
static enum elv_merge blk_try_req_merge(struct request *req,
struct request *next)
{
if (blk_discard_mergable(req))
return ELEVATOR_DISCARD_MERGE;
else if (blk_rq_pos(req) + blk_rq_sectors(req) == blk_rq_pos(next))
if (blk_rq_pos(req) + blk_rq_sectors(req) == blk_rq_pos(next))
return ELEVATOR_BACK_MERGE;
else if (blk_discard_mergable(req))
return ELEVATOR_DISCARD_MERGE;
return ELEVATOR_NO_MERGE;
}
@ -903,12 +903,12 @@ bool blk_rq_merge_ok(struct request *rq, struct bio *bio)
enum elv_merge blk_try_merge(struct request *rq, struct bio *bio)
{
if (blk_discard_mergable(rq))
return ELEVATOR_DISCARD_MERGE;
else if (blk_rq_pos(rq) + blk_rq_sectors(rq) == bio->bi_iter.bi_sector)
if (blk_rq_pos(rq) + blk_rq_sectors(rq) == bio->bi_iter.bi_sector)
return ELEVATOR_BACK_MERGE;
else if (blk_rq_pos(rq) - bio_sectors(bio) == bio->bi_iter.bi_sector)
return ELEVATOR_FRONT_MERGE;
else if (blk_discard_mergable(rq))
return ELEVATOR_DISCARD_MERGE;
return ELEVATOR_NO_MERGE;
}