From c05f8525f67b7d6489b0502211d4ed35622d9beb Mon Sep 17 00:00:00 2001 From: Omar Sandoval Date: Fri, 14 Apr 2017 01:00:01 -0700 Subject: 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 Signed-off-by: Jens Axboe --- block/blk-mq-sched.h | 11 +++-------- block/blk-mq.c | 5 ++++- include/linux/elevator.h | 2 +- 3 files changed, 8 insertions(+), 10 deletions(-) diff --git a/block/blk-mq-sched.h b/block/blk-mq-sched.h index f4bc186c3440..120c6abc37cc 100644 --- a/block/blk-mq-sched.h +++ b/block/blk-mq-sched.h @@ -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) diff --git a/block/blk-mq.c b/block/blk-mq.c index 7138cd98146e..e2ef7b460924 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -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) diff --git a/include/linux/elevator.h b/include/linux/elevator.h index b7ec315ee7e7..3a216318ae73 100644 --- a/include/linux/elevator.h +++ b/include/linux/elevator.h @@ -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 *); -- cgit v1.2.3