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mq-deadline: don't call req_get_ioprio from the I/O completion handler

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req_get_ioprio looks at req->bio to find the I/O priority, which is not
set when completing bios that the driver fully iterated through.

Stash away the dd_per_prio in the elevator private data instead of looking
it up again to optimize the code a bit while fixing the regression from
removing the per-request ioprio value.

Fixes: 6975c1a486 ("block: remove the ioprio field from struct request")
Reported-by: Chris Bainbridge <chris.bainbridge@gmail.com>
Reported-by: Sam Protsenko <semen.protsenko@linaro.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Chris Bainbridge <chris.bainbridge@gmail.com>
Tested-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20241126102136.619067-1-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2024-11-26 11:21:36 +01:00 committed by Jens Axboe
parent 0b83c86b44
commit 1b0cab327e
1 changed files with 4 additions and 9 deletions
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13
block/mq-deadline.c
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@ -685,10 +685,9 @@ static void dd_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq,
prio = ioprio_class_to_prio[ioprio_class];
per_prio = &dd->per_prio[prio];
if (!rq->elv.priv[0]) {
if (!rq->elv.priv[0])
per_prio->stats.inserted++;
rq->elv.priv[0] = (void *)(uintptr_t)1;
}
rq->elv.priv[0] = per_prio;
if (blk_mq_sched_try_insert_merge(q, rq, free))
return;
@ -753,18 +752,14 @@ static void dd_prepare_request(struct request *rq)
*/
static void dd_finish_request(struct request *rq)
{
struct request_queue *q = rq->q;
struct deadline_data *dd = q->elevator->elevator_data;
const u8 ioprio_class = dd_rq_ioclass(rq);
const enum dd_prio prio = ioprio_class_to_prio[ioprio_class];
struct dd_per_prio *per_prio = &dd->per_prio[prio];
struct dd_per_prio *per_prio = rq->elv.priv[0];
/*
* The block layer core may call dd_finish_request() without having
* called dd_insert_requests(). Skip requests that bypassed I/O
* scheduling. See also blk_mq_request_bypass_insert().
*/
if (rq->elv.priv[0])
if (per_prio)
atomic_inc(&per_prio->stats.completed);
}