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From: Jens Axboe <axboe@kernel.dk>
To: linux-block@vger.kernel.org
Cc: Jens Axboe <axboe@kernel.dk>, Josef Bacik <josef@toxicpanda.com>
Subject: [PATCH 03/11] blk-rq-qos: inline check for q->rq_qos functions
Date: Thu, 15 Nov 2018 12:51:27 -0700	[thread overview]
Message-ID: <20181115195135.22812-4-axboe@kernel.dk> (raw)
In-Reply-To: <20181115195135.22812-1-axboe@kernel.dk>

Put the short code in the fast path, where we don't have any
functions attached to the queue. This minimizes the impact on
the hot path in the core code.

Cc: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 block/blk-rq-qos.c | 63 +++++++++++++++++++++-------------------------
 block/blk-rq-qos.h | 59 +++++++++++++++++++++++++++++++++++++------
 2 files changed, 80 insertions(+), 42 deletions(-)

diff --git a/block/blk-rq-qos.c b/block/blk-rq-qos.c
index f8a4d3fbb98c..80f603b76f61 100644
--- a/block/blk-rq-qos.c
+++ b/block/blk-rq-qos.c
@@ -27,74 +27,67 @@ bool rq_wait_inc_below(struct rq_wait *rq_wait, unsigned int limit)
 	return atomic_inc_below(&rq_wait->inflight, limit);
 }
 
-void rq_qos_cleanup(struct request_queue *q, struct bio *bio)
+void __rq_qos_cleanup(struct rq_qos *rqos, struct bio *bio)
 {
-	struct rq_qos *rqos;
-
-	for (rqos = q->rq_qos; rqos; rqos = rqos->next) {
+	do {
 		if (rqos->ops->cleanup)
 			rqos->ops->cleanup(rqos, bio);
-	}
+		rqos = rqos->next;
+	} while (rqos);
 }
 
-void rq_qos_done(struct request_queue *q, struct request *rq)
+void __rq_qos_done(struct rq_qos *rqos, struct request *rq)
 {
-	struct rq_qos *rqos;
-
-	for (rqos = q->rq_qos; rqos; rqos = rqos->next) {
+	do {
 		if (rqos->ops->done)
 			rqos->ops->done(rqos, rq);
-	}
+		rqos = rqos->next;
+	} while (rqos);
 }
 
-void rq_qos_issue(struct request_queue *q, struct request *rq)
+void __rq_qos_issue(struct rq_qos *rqos, struct request *rq)
 {
-	struct rq_qos *rqos;
-
-	for(rqos = q->rq_qos; rqos; rqos = rqos->next) {
+	do {
 		if (rqos->ops->issue)
 			rqos->ops->issue(rqos, rq);
-	}
+		rqos = rqos->next;
+	} while (rqos);
 }
 
-void rq_qos_requeue(struct request_queue *q, struct request *rq)
+void __rq_qos_requeue(struct rq_qos *rqos, struct request *rq)
 {
-	struct rq_qos *rqos;
-
-	for(rqos = q->rq_qos; rqos; rqos = rqos->next) {
+	do {
 		if (rqos->ops->requeue)
 			rqos->ops->requeue(rqos, rq);
-	}
+		rqos = rqos->next;
+	} while (rqos);
 }
 
-void rq_qos_throttle(struct request_queue *q, struct bio *bio)
+void __rq_qos_throttle(struct rq_qos *rqos, struct bio *bio)
 {
-	struct rq_qos *rqos;
-
-	for(rqos = q->rq_qos; rqos; rqos = rqos->next) {
+	do {
 		if (rqos->ops->throttle)
 			rqos->ops->throttle(rqos, bio);
-	}
+		rqos = rqos->next;
+	} while (rqos);
 }
 
-void rq_qos_track(struct request_queue *q, struct request *rq, struct bio *bio)
+void __rq_qos_track(struct rq_qos *rqos, struct request *rq, struct bio *bio)
 {
-	struct rq_qos *rqos;
-
-	for(rqos = q->rq_qos; rqos; rqos = rqos->next) {
+	do {
 		if (rqos->ops->track)
 			rqos->ops->track(rqos, rq, bio);
-	}
+		rqos = rqos->next;
+	} while (rqos);
 }
 
-void rq_qos_done_bio(struct request_queue *q, struct bio *bio)
+void __rq_qos_done_bio(struct rq_qos *rqos, struct bio *bio)
 {
-	struct rq_qos *rqos;
-
-	for(rqos = q->rq_qos; rqos; rqos = rqos->next) {
+	do {
 		if (rqos->ops->done_bio)
 			rqos->ops->done_bio(rqos, bio);
-	}
+		rqos = rqos->next;
+	} while (rqos);
 }
 
 /*
diff --git a/block/blk-rq-qos.h b/block/blk-rq-qos.h
index b6b11d496007..6e09e98b93ea 100644
--- a/block/blk-rq-qos.h
+++ b/block/blk-rq-qos.h
@@ -98,12 +98,57 @@ void rq_depth_scale_up(struct rq_depth *rqd);
 void rq_depth_scale_down(struct rq_depth *rqd, bool hard_throttle);
 bool rq_depth_calc_max_depth(struct rq_depth *rqd);
 
-void rq_qos_cleanup(struct request_queue *, struct bio *);
-void rq_qos_done(struct request_queue *, struct request *);
-void rq_qos_issue(struct request_queue *, struct request *);
-void rq_qos_requeue(struct request_queue *, struct request *);
-void rq_qos_done_bio(struct request_queue *q, struct bio *bio);
-void rq_qos_throttle(struct request_queue *, struct bio *);
-void rq_qos_track(struct request_queue *q, struct request *, struct bio *);
+void __rq_qos_cleanup(struct rq_qos *rqos, struct bio *bio);
+void __rq_qos_done(struct rq_qos *rqos, struct request *rq);
+void __rq_qos_issue(struct rq_qos *rqos, struct request *rq);
+void __rq_qos_requeue(struct rq_qos *rqos, struct request *rq);
+void __rq_qos_throttle(struct rq_qos *rqos, struct bio *bio);
+void __rq_qos_track(struct rq_qos *rqos, struct request *rq, struct bio *bio);
+void __rq_qos_done_bio(struct rq_qos *rqos, struct bio *bio);
+
+static inline void rq_qos_cleanup(struct request_queue *q, struct bio *bio)
+{
+	if (q->rq_qos)
+		__rq_qos_cleanup(q->rq_qos, bio);
+}
+
+static inline void rq_qos_done(struct request_queue *q, struct request *rq)
+{
+	if (q->rq_qos)
+		__rq_qos_done(q->rq_qos, rq);
+}
+
+static inline void rq_qos_issue(struct request_queue *q, struct request *rq)
+{
+	if (q->rq_qos)
+		__rq_qos_issue(q->rq_qos, rq);
+}
+
+static inline void rq_qos_requeue(struct request_queue *q, struct request *rq)
+{
+	if (q->rq_qos)
+		__rq_qos_requeue(q->rq_qos, rq);
+}
+
+static inline void rq_qos_done_bio(struct request_queue *q, struct bio *bio)
+{
+	if (q->rq_qos)
+		__rq_qos_done_bio(q->rq_qos, bio);
+}
+
+static inline void rq_qos_throttle(struct request_queue *q, struct bio *bio)
+{
+	if (q->rq_qos)
+		__rq_qos_throttle(q->rq_qos, bio);
+}
+
+static inline void rq_qos_track(struct request_queue *q, struct request *rq,
+				struct bio *bio)
+{
+	if (q->rq_qos)
+		__rq_qos_track(q->rq_qos, rq, bio);
+}
+
 void rq_qos_exit(struct request_queue *);
+
 #endif
-- 
2.17.1


  parent reply	other threads:[~2018-11-15 19:51 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-15 19:51 [PATCHSET v2 0/11] Various block optimizations Jens Axboe
2018-11-15 19:51 ` [PATCH 01/11] nvme: provide optimized poll function for separate poll queues Jens Axboe
2018-11-16  8:35   ` Christoph Hellwig
2018-11-16 15:22     ` Jens Axboe
2018-11-15 19:51 ` [PATCH 02/11] block: add queue_is_mq() helper Jens Axboe
2018-11-16  8:35   ` Christoph Hellwig
2018-11-15 19:51 ` Jens Axboe [this message]
2018-11-16  8:38   ` [PATCH 03/11] blk-rq-qos: inline check for q->rq_qos functions Christoph Hellwig
2018-11-16 15:18     ` Jens Axboe
2018-11-15 19:51 ` [PATCH 04/11] block: avoid ordered task state change for polled IO Jens Axboe
2018-11-16  8:41   ` Christoph Hellwig
2018-11-16 15:32     ` Jens Axboe
2018-11-15 19:51 ` [PATCH 05/11] block: add polled wakeup task helper Jens Axboe
2018-11-16  8:41   ` Christoph Hellwig
2018-11-15 19:51 ` [PATCH 06/11] block: have ->poll_fn() return number of entries polled Jens Axboe
2018-11-15 19:51 ` [PATCH 07/11] blk-mq: when polling for IO, look for any completion Jens Axboe
2018-11-16  8:43   ` Christoph Hellwig
2018-11-16 15:19     ` Jens Axboe
2018-11-16 16:57       ` Jens Axboe
2018-11-15 19:51 ` [PATCH 08/11] block: make blk_poll() take a parameter on whether to spin or not Jens Axboe
2018-11-15 19:51 ` [PATCH 09/11] blk-mq: ensure mq_ops ->poll() is entered at least once Jens Axboe
2018-11-15 19:51 ` [PATCH 10/11] block: for async O_DIRECT, mark us as polling if asked to Jens Axboe
2018-11-16  8:47   ` Christoph Hellwig
2018-11-16  8:48     ` Christoph Hellwig
2018-11-16 15:19       ` Jens Axboe
2018-11-15 19:51 ` [PATCH 11/11] block: don't plug for aio/O_DIRECT HIPRI IO Jens Axboe
2018-11-16  8:49   ` Christoph Hellwig

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