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blk-mq: add QUEUE_FLAG_BIO_ISSUE_TIME 

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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5
block/blk-iolatency.c
View File

@ -742,10 +742,15 @@ static void blkiolatency_enable_work_fn(struct work_struct *work)
*/
enabled = atomic_read(&blkiolat->enable_cnt);
if (enabled != blkiolat->enabled) {
struct request_queue *q = blkiolat->rqos.disk->queue;
unsigned int memflags;
memflags = blk_mq_freeze_queue(blkiolat->rqos.disk->queue);
blkiolat->enabled = enabled;
if (enabled)
blk_queue_flag_set(QUEUE_FLAG_BIO_ISSUE_TIME, q);
else
blk_queue_flag_clear(QUEUE_FLAG_BIO_ISSUE_TIME, q);
blk_mq_unfreeze_queue(blkiolat->rqos.disk->queue, memflags);
}
}

1
block/blk-mq-debugfs.c
View File

@ -96,6 +96,7 @@ static const char *const blk_queue_flag_name[] = {
QUEUE_FLAG_NAME(DISABLE_WBT_DEF),
QUEUE_FLAG_NAME(NO_ELV_SWITCH),
QUEUE_FLAG_NAME(QOS_ENABLED),
QUEUE_FLAG_NAME(BIO_ISSUE_TIME),
};
#undef QUEUE_FLAG_NAME

8
block/blk-mq.c
View File

@ -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;

1
include/linux/blkdev.h
View File

@ -657,6 +657,7 @@ enum {
QUEUE_FLAG_DISABLE_WBT_DEF, /* for sched to disable/enable wbt */
QUEUE_FLAG_NO_ELV_SWITCH, /* can't switch elevator any more */
QUEUE_FLAG_QOS_ENABLED, /* qos is enabled */
QUEUE_FLAG_BIO_ISSUE_TIME, /* record bio->issue_time_ns */
QUEUE_FLAG_MAX
};