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blk-mq: add QUEUE_FLAG_BIO_ISSUE_TIME

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bio->issue_time_ns is initialized for every bio, however, it's only used
by blk-iolatency. Add a new queue_flag and only set this flag when
blk-iolatency is enabled, so that extra blk_time_get_ns() can be saved
for disks that blk-iolatency is not enabled.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Yu Kuai
2025-09-10 14:30:43 +08:00
committed by Jens Axboe
parent 1f963bdd64
commit ea3d1f104d
4 changed files with 12 additions and 3 deletions
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8
block/blk-mq.c
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@@ -396,10 +396,12 @@ static inline void blk_mq_rq_time_init(struct request *rq, u64 alloc_time_ns)
#endif
}
static inline void blk_mq_bio_issue_init(struct bio *bio)
static inline void blk_mq_bio_issue_init(struct request_queue *q,
struct bio *bio)
{
#ifdef CONFIG_BLK_CGROUP
bio->issue_time_ns = blk_time_get_ns();
if (test_bit(QUEUE_FLAG_BIO_ISSUE_TIME, &q->queue_flags))
bio->issue_time_ns = blk_time_get_ns();
#endif
}
@@ -3175,7 +3177,7 @@ void blk_mq_submit_bio(struct bio *bio)
if (!bio_integrity_prep(bio))
goto queue_exit;
blk_mq_bio_issue_init(bio);
blk_mq_bio_issue_init(q, bio);
if (blk_mq_attempt_bio_merge(q, bio, nr_segs))
goto queue_exit;