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blk-mq: add optional request->alloc_time_ns

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There are currently two start time timestamps - start_time_ns and
io_start_time_ns.  The former marks the request allocation and and the
second issue-to-device time.  The planned io.weight controller needs
to measure the total time bios take to execute after it leaves rq_qos
including the time spent waiting for request to become available,
which can easily dominate on saturated devices.

This patch adds request->alloc_time_ns which records when the request
allocation attempt started.  As it isn't used for the usual stats,
make it optional behind CONFIG_BLK_RQ_ALLOC_TIME and
QUEUE_FLAG_RQ_ALLOC_TIME so that it can be compiled out when there are
no users and it's active only on queues which need it even when
compiled in.

v2: s/pre_start_time/alloc_time/ and add CONFIG_BLK_RQ_ALLOC_TIME
    gating as suggested by Jens.

Signed-off-by: Tejun Heo <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Tejun Heo 2019-08-28 15:05:57 -07:00 • committed by Jens Axboe
commit 6f816b4b74
3 changed files with 26 additions and 3 deletions
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3
block/Kconfig
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@ -26,6 +26,9 @@ menuconfig BLOCK
if BLOCK
config BLK_RQ_ALLOC_TIME
bool
config BLK_SCSI_REQUEST
bool