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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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include/linux/blkdev.h
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@@ -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
};