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blk-mq-sched: make completed_request() callback more useful 

Currently, this callback is called right after put_request() and has no
distinguishable purpose. Instead, let's call it before put_request() as
soon as I/O has completed on the request, before we account it in
blk-stat. With this, Kyber can enable stats when it sees a latency
outlier and make sure the outlier gets accounted.

Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Omar Sandoval 2017-04-14 01:00:01 -07:00 committed by Jens Axboe
parent 5b72727299
commit c05f8525f6
3 changed files with 8 additions and 10 deletions
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11
block/blk-mq-sched.h
View File

@ -82,17 +82,12 @@ blk_mq_sched_allow_merge(struct request_queue *q, struct request *rq,
return true;
}
static inline void
blk_mq_sched_completed_request(struct blk_mq_hw_ctx *hctx, struct request *rq)
static inline void blk_mq_sched_completed_request(struct request *rq)
{
struct elevator_queue *e = hctx->queue->elevator;
struct elevator_queue *e = rq->q->elevator;
if (e && e->type->ops.mq.completed_request)
e->type->ops.mq.completed_request(hctx, rq);
BUG_ON(rq->internal_tag == -1);
blk_mq_put_tag(hctx, hctx->sched_tags, rq->mq_ctx, rq->internal_tag);
e->type->ops.mq.completed_request(rq);
}
static inline void blk_mq_sched_started_request(struct request *rq)

5
block/blk-mq.c
View File

@ -350,7 +350,7 @@ void __blk_mq_finish_request(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
if (rq->tag != -1)
blk_mq_put_tag(hctx, hctx->tags, ctx, rq->tag);
if (sched_tag != -1)
blk_mq_sched_completed_request(hctx, rq);
blk_mq_put_tag(hctx, hctx->sched_tags, ctx, sched_tag);
blk_mq_sched_restart(hctx);
blk_queue_exit(q);
}
@ -444,6 +444,9 @@ static void __blk_mq_complete_request(struct request *rq)
{
struct request_queue *q = rq->q;
if (rq->internal_tag != -1)
blk_mq_sched_completed_request(rq);
blk_mq_stat_add(rq);
if (!q->softirq_done_fn)

2
include/linux/elevator.h
View File

@ -106,7 +106,7 @@ struct elevator_mq_ops {
void (*insert_requests)(struct blk_mq_hw_ctx *, struct list_head *, bool);
struct request *(*dispatch_request)(struct blk_mq_hw_ctx *);
bool (*has_work)(struct blk_mq_hw_ctx *);
void (*completed_request)(struct blk_mq_hw_ctx *, struct request *);
void (*completed_request)(struct request *);
void (*started_request)(struct request *);
void (*requeue_request)(struct request *);
struct request *(*former_request)(struct request_queue *, struct request *);