[dm-devel] block tracepoint cleanups v2

[dm-devel] block tracepoint cleanups v2

[Christoph Hellwig]

Hi Jens,

this series cleans up the block layer tracepoints by removing unused
tracepoints or tracepoint arguments and consolidating the implementation
of various bio based tracepoints.

Changes since v1:
 - a few commit log typo fixes and improvements


Diffstat:
 block/blk-core.c              |    4 
 block/blk-merge.c             |    8 -
 block/blk-mq-sched.c          |    2 
 block/blk-mq.c                |   10 -
 block/bounce.c                |    2 
 drivers/md/dm-rq.c            |    2 
 drivers/md/dm.c               |    5 
 drivers/md/md-linear.c        |    3 
 drivers/md/md.c               |    5 
 drivers/md/raid0.c            |    4 
 drivers/md/raid1.c            |    7 -
 drivers/md/raid10.c           |    6 -
 drivers/md/raid5.c            |   15 +-
 drivers/nvme/host/multipath.c |    3 
 drivers/s390/scsi/zfcp_fsf.c  |    3 
 include/linux/blktrace_api.h  |    5 
 include/trace/events/block.h  |  228 +++++++++---------------------------------
 kernel/trace/blktrace.c       |  126 ++++++-----------------
 18 files changed, 125 insertions(+), 313 deletions(-)

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[dm-devel] [PATCH 1/5] block: remove the unused block_sleeprq tracepoint

[Christoph Hellwig]

The block_sleeprq tracepoint was only used by the legacy request code.
Remove it now that the legacy request code is gone.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
---
 include/trace/events/block.h | 18 ------------------
 kernel/trace/blktrace.c      | 22 ----------------------
 2 files changed, 40 deletions(-)

diff --git a/include/trace/events/block.h b/include/trace/events/block.h
index 34d64ca306b1c7..76459cf750e14d 100644
--- a/include/trace/events/block.h
+++ b/include/trace/events/block.h
@@ -441,24 +441,6 @@ DEFINE_EVENT(block_get_rq, block_getrq,
 	TP_ARGS(q, bio, rw)
 );
 
-/**
- * block_sleeprq - waiting to get a free request entry in queue for block IO operation
- * @q: queue for operation
- * @bio: pending block IO operation (can be %NULL)
- * @rw: low bit indicates a read (%0) or a write (%1)
- *
- * In the case where a request struct cannot be provided for queue @q
- * the process needs to wait for an request struct to become
- * available.  This tracepoint event is generated each time the
- * process goes to sleep waiting for request struct become available.
- */
-DEFINE_EVENT(block_get_rq, block_sleeprq,
-
-	TP_PROTO(struct request_queue *q, struct bio *bio, int rw),
-
-	TP_ARGS(q, bio, rw)
-);
-
 /**
  * block_plug - keep operations requests in request queue
  * @q: request queue to plug
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index a482a37848bff7..ced589df304b57 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -959,25 +959,6 @@ static void blk_add_trace_getrq(void *ignore,
 	}
 }
 
-
-static void blk_add_trace_sleeprq(void *ignore,
-				  struct request_queue *q,
-				  struct bio *bio, int rw)
-{
-	if (bio)
-		blk_add_trace_bio(q, bio, BLK_TA_SLEEPRQ, 0);
-	else {
-		struct blk_trace *bt;
-
-		rcu_read_lock();
-		bt = rcu_dereference(q->blk_trace);
-		if (bt)
-			__blk_add_trace(bt, 0, 0, rw, 0, BLK_TA_SLEEPRQ,
-					0, 0, NULL, 0);
-		rcu_read_unlock();
-	}
-}
-
 static void blk_add_trace_plug(void *ignore, struct request_queue *q)
 {
 	struct blk_trace *bt;
@@ -1164,8 +1145,6 @@ static void blk_register_tracepoints(void)
 	WARN_ON(ret);
 	ret = register_trace_block_getrq(blk_add_trace_getrq, NULL);
 	WARN_ON(ret);
-	ret = register_trace_block_sleeprq(blk_add_trace_sleeprq, NULL);
-	WARN_ON(ret);
 	ret = register_trace_block_plug(blk_add_trace_plug, NULL);
 	WARN_ON(ret);
 	ret = register_trace_block_unplug(blk_add_trace_unplug, NULL);
@@ -1185,7 +1164,6 @@ static void blk_unregister_tracepoints(void)
 	unregister_trace_block_split(blk_add_trace_split, NULL);
 	unregister_trace_block_unplug(blk_add_trace_unplug, NULL);
 	unregister_trace_block_plug(blk_add_trace_plug, NULL);
-	unregister_trace_block_sleeprq(blk_add_trace_sleeprq, NULL);
 	unregister_trace_block_getrq(blk_add_trace_getrq, NULL);
 	unregister_trace_block_bio_queue(blk_add_trace_bio_queue, NULL);
 	unregister_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge, NULL);
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Re: [dm-devel] [PATCH 1/5] block: remove the unused block_sleeprq tracepoint

[Tejun Heo]

On Thu, Dec 03, 2020 at 05:21:35PM +0100, Christoph Hellwig wrote:
> The block_sleeprq tracepoint was only used by the legacy request code.
> Remove it now that the legacy request code is gone.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
> Reviewed-by: Hannes Reinecke <hare@suse.de>

Acked-by: Tejun Heo <tj@kernel.org>

Thanks.

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Re: [dm-devel] [PATCH 1/5] block: remove the unused block_sleeprq tracepoint

[Chaitanya Kulkarni]

On 12/3/20 08:24, Christoph Hellwig wrote:
> The block_sleeprq tracepoint was only used by the legacy request code.
> Remove it now that the legacy request code is gone.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
> Reviewed-by: Hannes Reinecke <hare@suse.de>

Looks good.

Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>




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[dm-devel] [PATCH 2/5] block: simplify and extend the block_bio_merge tracepoint class

[Christoph Hellwig]

The block_bio_merge tracepoint class can be reused for most bio-based
tracepoints.  For that it just needs to lose the superfluous q and rq
parameters.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
---
 block/blk-core.c             |   2 +-
 block/blk-merge.c            |   4 +-
 block/blk-mq.c               |   2 +-
 block/bounce.c               |   2 +-
 include/trace/events/block.h | 158 ++++++++---------------------------
 kernel/trace/blktrace.c      |  41 +++------
 6 files changed, 48 insertions(+), 161 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index cee568389b7e11..cb24654983e1e4 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -907,7 +907,7 @@ static noinline_for_stack bool submit_bio_checks(struct bio *bio)
 	blkcg_bio_issue_init(bio);
 
 	if (!bio_flagged(bio, BIO_TRACE_COMPLETION)) {
-		trace_block_bio_queue(q, bio);
+		trace_block_bio_queue(bio);
 		/* Now that enqueuing has been traced, we need to trace
 		 * completion as well.
 		 */
diff --git a/block/blk-merge.c b/block/blk-merge.c
index cb351ab9b77dbd..1a46d5bbd399e3 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -922,7 +922,7 @@ static enum bio_merge_status bio_attempt_back_merge(struct request *req,
 	if (!ll_back_merge_fn(req, bio, nr_segs))
 		return BIO_MERGE_FAILED;
 
-	trace_block_bio_backmerge(req->q, req, bio);
+	trace_block_bio_backmerge(bio);
 	rq_qos_merge(req->q, req, bio);
 
 	if ((req->cmd_flags & REQ_FAILFAST_MASK) != ff)
@@ -946,7 +946,7 @@ static enum bio_merge_status bio_attempt_front_merge(struct request *req,
 	if (!ll_front_merge_fn(req, bio, nr_segs))
 		return BIO_MERGE_FAILED;
 
-	trace_block_bio_frontmerge(req->q, req, bio);
+	trace_block_bio_frontmerge(bio);
 	rq_qos_merge(req->q, req, bio);
 
 	if ((req->cmd_flags & REQ_FAILFAST_MASK) != ff)
diff --git a/block/blk-mq.c b/block/blk-mq.c
index ce6cd12aeda54e..26eaf476f1e12b 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2184,7 +2184,7 @@ blk_qc_t blk_mq_submit_bio(struct bio *bio)
 		goto queue_exit;
 	}
 
-	trace_block_getrq(q, bio, bio->bi_opf);
+	trace_block_getrq(bio);
 
 	rq_qos_track(q, rq, bio);
 
diff --git a/block/bounce.c b/block/bounce.c
index 162a6eee89996a..d3f51acd6e3b51 100644
--- a/block/bounce.c
+++ b/block/bounce.c
@@ -340,7 +340,7 @@ static void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig,
 		}
 	}
 
-	trace_block_bio_bounce(q, *bio_orig);
+	trace_block_bio_bounce(*bio_orig);
 
 	bio->bi_flags |= (1 << BIO_BOUNCED);
 
diff --git a/include/trace/events/block.h b/include/trace/events/block.h
index 76459cf750e14d..506c29dc7c76fd 100644
--- a/include/trace/events/block.h
+++ b/include/trace/events/block.h
@@ -226,45 +226,6 @@ DEFINE_EVENT(block_rq, block_rq_merge,
 	TP_ARGS(q, rq)
 );
 
-/**
- * block_bio_bounce - used bounce buffer when processing block operation
- * @q: queue holding the block operation
- * @bio: block operation
- *
- * A bounce buffer was used to handle the block operation @bio in @q.
- * This occurs when hardware limitations prevent a direct transfer of
- * data between the @bio data memory area and the IO device.  Use of a
- * bounce buffer requires extra copying of data and decreases
- * performance.
- */
-TRACE_EVENT(block_bio_bounce,
-
-	TP_PROTO(struct request_queue *q, struct bio *bio),
-
-	TP_ARGS(q, bio),
-
-	TP_STRUCT__entry(
-		__field( dev_t,		dev			)
-		__field( sector_t,	sector			)
-		__field( unsigned int,	nr_sector		)
-		__array( char,		rwbs,	RWBS_LEN	)
-		__array( char,		comm,	TASK_COMM_LEN	)
-	),
-
-	TP_fast_assign(
-		__entry->dev		= bio_dev(bio);
-		__entry->sector		= bio->bi_iter.bi_sector;
-		__entry->nr_sector	= bio_sectors(bio);
-		blk_fill_rwbs(__entry->rwbs, bio->bi_opf, bio->bi_iter.bi_size);
-		memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
-	),
-
-	TP_printk("%d,%d %s %llu + %u [%s]",
-		  MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,
-		  (unsigned long long)__entry->sector,
-		  __entry->nr_sector, __entry->comm)
-);
-
 /**
  * block_bio_complete - completed all work on the block operation
  * @q: queue holding the block operation
@@ -301,11 +262,11 @@ TRACE_EVENT(block_bio_complete,
 		  __entry->nr_sector, __entry->error)
 );
 
-DECLARE_EVENT_CLASS(block_bio_merge,
+DECLARE_EVENT_CLASS(block_bio,
 
-	TP_PROTO(struct request_queue *q, struct request *rq, struct bio *bio),
+	TP_PROTO(struct bio *bio),
 
-	TP_ARGS(q, rq, bio),
+	TP_ARGS(bio),
 
 	TP_STRUCT__entry(
 		__field( dev_t,		dev			)
@@ -329,116 +290,63 @@ DECLARE_EVENT_CLASS(block_bio_merge,
 		  __entry->nr_sector, __entry->comm)
 );
 
+/**
+ * block_bio_bounce - used bounce buffer when processing block operation
+ * @bio: block operation
+ *
+ * A bounce buffer was used to handle the block operation @bio in @q.
+ * This occurs when hardware limitations prevent a direct transfer of
+ * data between the @bio data memory area and the IO device.  Use of a
+ * bounce buffer requires extra copying of data and decreases
+ * performance.
+ */
+DEFINE_EVENT(block_bio, block_bio_bounce,
+	TP_PROTO(struct bio *bio),
+	TP_ARGS(bio)
+);
+
 /**
  * block_bio_backmerge - merging block operation to the end of an existing operation
- * @q: queue holding operation
- * @rq: request bio is being merged into
  * @bio: new block operation to merge
  *
- * Merging block request @bio to the end of an existing block request
- * in queue @q.
+ * Merging block request @bio to the end of an existing block request.
  */
-DEFINE_EVENT(block_bio_merge, block_bio_backmerge,
-
-	TP_PROTO(struct request_queue *q, struct request *rq, struct bio *bio),
-
-	TP_ARGS(q, rq, bio)
+DEFINE_EVENT(block_bio, block_bio_backmerge,
+	TP_PROTO(struct bio *bio),
+	TP_ARGS(bio)
 );
 
 /**
  * block_bio_frontmerge - merging block operation to the beginning of an existing operation
- * @q: queue holding operation
- * @rq: request bio is being merged into
  * @bio: new block operation to merge
  *
- * Merging block IO operation @bio to the beginning of an existing block
- * operation in queue @q.
+ * Merging block IO operation @bio to the beginning of an existing block request.
  */
-DEFINE_EVENT(block_bio_merge, block_bio_frontmerge,
-
-	TP_PROTO(struct request_queue *q, struct request *rq, struct bio *bio),
-
-	TP_ARGS(q, rq, bio)
+DEFINE_EVENT(block_bio, block_bio_frontmerge,
+	TP_PROTO(struct bio *bio),
+	TP_ARGS(bio)
 );
 
 /**
  * block_bio_queue - putting new block IO operation in queue
- * @q: queue holding operation
  * @bio: new block operation
  *
  * About to place the block IO operation @bio into queue @q.
  */
-TRACE_EVENT(block_bio_queue,
-
-	TP_PROTO(struct request_queue *q, struct bio *bio),
-
-	TP_ARGS(q, bio),
-
-	TP_STRUCT__entry(
-		__field( dev_t,		dev			)
-		__field( sector_t,	sector			)
-		__field( unsigned int,	nr_sector		)
-		__array( char,		rwbs,	RWBS_LEN	)
-		__array( char,		comm,	TASK_COMM_LEN	)
-	),
-
-	TP_fast_assign(
-		__entry->dev		= bio_dev(bio);
-		__entry->sector		= bio->bi_iter.bi_sector;
-		__entry->nr_sector	= bio_sectors(bio);
-		blk_fill_rwbs(__entry->rwbs, bio->bi_opf, bio->bi_iter.bi_size);
-		memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
-	),
-
-	TP_printk("%d,%d %s %llu + %u [%s]",
-		  MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,
-		  (unsigned long long)__entry->sector,
-		  __entry->nr_sector, __entry->comm)
-);
-
-DECLARE_EVENT_CLASS(block_get_rq,
-
-	TP_PROTO(struct request_queue *q, struct bio *bio, int rw),
-
-	TP_ARGS(q, bio, rw),
-
-	TP_STRUCT__entry(
-		__field( dev_t,		dev			)
-		__field( sector_t,	sector			)
-		__field( unsigned int,	nr_sector		)
-		__array( char,		rwbs,	RWBS_LEN	)
-		__array( char,		comm,	TASK_COMM_LEN	)
-        ),
-
-	TP_fast_assign(
-		__entry->dev		= bio ? bio_dev(bio) : 0;
-		__entry->sector		= bio ? bio->bi_iter.bi_sector : 0;
-		__entry->nr_sector	= bio ? bio_sectors(bio) : 0;
-		blk_fill_rwbs(__entry->rwbs,
-			      bio ? bio->bi_opf : 0, __entry->nr_sector);
-		memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
-        ),
-
-	TP_printk("%d,%d %s %llu + %u [%s]",
-		  MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,
-		  (unsigned long long)__entry->sector,
-		  __entry->nr_sector, __entry->comm)
+DEFINE_EVENT(block_bio, block_bio_queue,
+	TP_PROTO(struct bio *bio),
+	TP_ARGS(bio)
 );
 
 /**
  * block_getrq - get a free request entry in queue for block IO operations
- * @q: queue for operations
  * @bio: pending block IO operation (can be %NULL)
- * @rw: low bit indicates a read (%0) or a write (%1)
  *
- * A request struct for queue @q has been allocated to handle the
- * block IO operation @bio.
+ * A request struct has been allocated to handle the block IO operation @bio.
  */
-DEFINE_EVENT(block_get_rq, block_getrq,
-
-	TP_PROTO(struct request_queue *q, struct bio *bio, int rw),
-
-	TP_ARGS(q, bio, rw)
+DEFINE_EVENT(block_bio, block_getrq,
+	TP_PROTO(struct bio *bio),
+	TP_ARGS(bio)
 );
 
 /**
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index ced589df304b57..7ab88e00c15765 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -906,10 +906,9 @@ static void blk_add_trace_bio(struct request_queue *q, struct bio *bio,
 	rcu_read_unlock();
 }
 
-static void blk_add_trace_bio_bounce(void *ignore,
-				     struct request_queue *q, struct bio *bio)
+static void blk_add_trace_bio_bounce(void *ignore, struct bio *bio)
 {
-	blk_add_trace_bio(q, bio, BLK_TA_BOUNCE, 0);
+	blk_add_trace_bio(bio->bi_disk->queue, bio, BLK_TA_BOUNCE, 0);
 }
 
 static void blk_add_trace_bio_complete(void *ignore,
@@ -919,44 +918,24 @@ static void blk_add_trace_bio_complete(void *ignore,
 			  blk_status_to_errno(bio->bi_status));
 }
 
-static void blk_add_trace_bio_backmerge(void *ignore,
-					struct request_queue *q,
-					struct request *rq,
-					struct bio *bio)
+static void blk_add_trace_bio_backmerge(void *ignore, struct bio *bio)
 {
-	blk_add_trace_bio(q, bio, BLK_TA_BACKMERGE, 0);
+	blk_add_trace_bio(bio->bi_disk->queue, bio, BLK_TA_BACKMERGE, 0);
 }
 
-static void blk_add_trace_bio_frontmerge(void *ignore,
-					 struct request_queue *q,
-					 struct request *rq,
-					 struct bio *bio)
+static void blk_add_trace_bio_frontmerge(void *ignore, struct bio *bio)
 {
-	blk_add_trace_bio(q, bio, BLK_TA_FRONTMERGE, 0);
+	blk_add_trace_bio(bio->bi_disk->queue, bio, BLK_TA_FRONTMERGE, 0);
 }
 
-static void blk_add_trace_bio_queue(void *ignore,
-				    struct request_queue *q, struct bio *bio)
+static void blk_add_trace_bio_queue(void *ignore, struct bio *bio)
 {
-	blk_add_trace_bio(q, bio, BLK_TA_QUEUE, 0);
+	blk_add_trace_bio(bio->bi_disk->queue, bio, BLK_TA_QUEUE, 0);
 }
 
-static void blk_add_trace_getrq(void *ignore,
-				struct request_queue *q,
-				struct bio *bio, int rw)
+static void blk_add_trace_getrq(void *ignore, struct bio *bio)
 {
-	if (bio)
-		blk_add_trace_bio(q, bio, BLK_TA_GETRQ, 0);
-	else {
-		struct blk_trace *bt;
-
-		rcu_read_lock();
-		bt = rcu_dereference(q->blk_trace);
-		if (bt)
-			__blk_add_trace(bt, 0, 0, rw, 0, BLK_TA_GETRQ, 0, 0,
-					NULL, 0);
-		rcu_read_unlock();
-	}
+	blk_add_trace_bio(bio->bi_disk->queue, bio, BLK_TA_GETRQ, 0);
 }
 
 static void blk_add_trace_plug(void *ignore, struct request_queue *q)
-- 
2.29.2

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Re: [dm-devel] [PATCH 2/5] block: simplify and extend the block_bio_merge tracepoint class

[Tejun Heo]

On Thu, Dec 03, 2020 at 05:21:36PM +0100, Christoph Hellwig wrote:
> The block_bio_merge tracepoint class can be reused for most bio-based
> tracepoints.  For that it just needs to lose the superfluous q and rq
> parameters.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
> Reviewed-by: Hannes Reinecke <hare@suse.de>

Acked-by: Tejun Heo <tj@kernel.org>

Thanks.

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Re: [dm-devel] [PATCH 2/5] block: simplify and extend the block_bio_merge tracepoint class

[Chaitanya Kulkarni]

On 12/3/20 08:26, Christoph Hellwig wrote:
> The block_bio_merge tracepoint class can be reused for most bio-based
> tracepoints.  For that it just needs to lose the superfluous q and rq
> parameters.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
> Reviewed-by: Hannes Reinecke <hare@suse.de>

Looks good.

Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>




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[dm-devel] [PATCH 3/5] block: remove the request_queue argument to the block_split tracepoint

[Christoph Hellwig]

The request_queue can trivially be derived from the bio.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
---
 block/blk-merge.c            |  2 +-
 drivers/md/dm.c              |  2 +-
 include/trace/events/block.h | 14 ++++++--------
 kernel/trace/blktrace.c      |  5 ++---
 4 files changed, 10 insertions(+), 13 deletions(-)

diff --git a/block/blk-merge.c b/block/blk-merge.c
index 1a46d5bbd399e3..4071daa88a5eaf 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -338,7 +338,7 @@ void __blk_queue_split(struct bio **bio, unsigned int *nr_segs)
 		split->bi_opf |= REQ_NOMERGE;
 
 		bio_chain(split, *bio);
-		trace_block_split(q, split, (*bio)->bi_iter.bi_sector);
+		trace_block_split(split, (*bio)->bi_iter.bi_sector);
 		submit_bio_noacct(*bio);
 		*bio = split;
 	}
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index ed7e836efbcdbc..9a5bd90779c7c4 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1612,7 +1612,7 @@ static blk_qc_t __split_and_process_bio(struct mapped_device *md,
 				part_stat_unlock();
 
 				bio_chain(b, bio);
-				trace_block_split(md->queue, b, bio->bi_iter.bi_sector);
+				trace_block_split(b, bio->bi_iter.bi_sector);
 				ret = submit_bio_noacct(bio);
 				break;
 			}
diff --git a/include/trace/events/block.h b/include/trace/events/block.h
index 506c29dc7c76fd..b415e4cba84304 100644
--- a/include/trace/events/block.h
+++ b/include/trace/events/block.h
@@ -411,21 +411,19 @@ DEFINE_EVENT(block_unplug, block_unplug,
 
 /**
  * block_split - split a single bio struct into two bio structs
- * @q: queue containing the bio
  * @bio: block operation being split
  * @new_sector: The starting sector for the new bio
  *
- * The bio request @bio in request queue @q needs to be split into two
- * bio requests. The newly created @bio request starts at
- * @new_sector. This split may be required due to hardware limitation
- * such as operation crossing device boundaries in a RAID system.
+ * The bio request @bio needs to be split into two bio requests.  The newly
+ * created @bio request starts at @new_sector. This split may be required due to
+ * hardware limitations such as operation crossing device boundaries in a RAID
+ * system.
  */
 TRACE_EVENT(block_split,
 
-	TP_PROTO(struct request_queue *q, struct bio *bio,
-		 unsigned int new_sector),
+	TP_PROTO(struct bio *bio, unsigned int new_sector),
 
-	TP_ARGS(q, bio, new_sector),
+	TP_ARGS(bio, new_sector),
 
 	TP_STRUCT__entry(
 		__field( dev_t,		dev				)
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 7ab88e00c15765..3ca6d62114f461 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -970,10 +970,9 @@ static void blk_add_trace_unplug(void *ignore, struct request_queue *q,
 	rcu_read_unlock();
 }
 
-static void blk_add_trace_split(void *ignore,
-				struct request_queue *q, struct bio *bio,
-				unsigned int pdu)
+static void blk_add_trace_split(void *ignore, struct bio *bio, unsigned int pdu)
 {
+	struct request_queue *q = bio->bi_disk->queue;
 	struct blk_trace *bt;
 
 	rcu_read_lock();
-- 
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Re: [dm-devel] [PATCH 3/5] block: remove the request_queue argument to the block_split tracepoint

[Tejun Heo]

On Thu, Dec 03, 2020 at 05:21:37PM +0100, Christoph Hellwig wrote:
> The request_queue can trivially be derived from the bio.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
> Reviewed-by: Hannes Reinecke <hare@suse.de>

Acked-by: Tejun Heo <tj@kernel.org>

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Re: [dm-devel] [PATCH 3/5] block: remove the request_queue argument to the block_split tracepoint

[Chaitanya Kulkarni]

On 12/3/20 08:26, Christoph Hellwig wrote:
> The request_queue can trivially be derived from the bio.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
> Reviewed-by: Hannes Reinecke <hare@suse.de>
> ---

Looks good.

Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>




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[dm-devel] [PATCH 4/5] block: remove the request_queue argument to the block_bio_remap tracepoint

[Christoph Hellwig]

The request_queue can trivially be derived from the bio.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
---
 block/blk-core.c              |  2 +-
 drivers/md/dm.c               |  3 +--
 drivers/md/md-linear.c        |  3 +--
 drivers/md/md.c               |  5 ++---
 drivers/md/raid0.c            |  4 ++--
 drivers/md/raid1.c            |  7 +++----
 drivers/md/raid10.c           |  6 ++----
 drivers/md/raid5.c            | 15 +++++++--------
 drivers/nvme/host/multipath.c |  3 +--
 include/trace/events/block.h  |  8 +++-----
 kernel/trace/blktrace.c       | 14 +++++---------
 11 files changed, 28 insertions(+), 42 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index cb24654983e1e4..96e5fcd7f071b6 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -758,7 +758,7 @@ static inline int blk_partition_remap(struct bio *bio)
 		if (bio_check_eod(bio, bdev_nr_sectors(p)))
 			goto out;
 		bio->bi_iter.bi_sector += p->bd_start_sect;
-		trace_block_bio_remap(bio->bi_disk->queue, bio, p->bd_dev,
+		trace_block_bio_remap(bio, p->bd_dev,
 				      bio->bi_iter.bi_sector -
 				      p->bd_start_sect);
 	}
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 9a5bd90779c7c4..5181907dc59537 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1276,8 +1276,7 @@ static blk_qc_t __map_bio(struct dm_target_io *tio)
 		break;
 	case DM_MAPIO_REMAPPED:
 		/* the bio has been remapped so dispatch it */
-		trace_block_bio_remap(clone->bi_disk->queue, clone,
-				      bio_dev(io->orig_bio), sector);
+		trace_block_bio_remap(clone, bio_dev(io->orig_bio), sector);
 		ret = submit_bio_noacct(clone);
 		break;
 	case DM_MAPIO_KILL:
diff --git a/drivers/md/md-linear.c b/drivers/md/md-linear.c
index 98f1b4b2bdcef8..68cac7d1927823 100644
--- a/drivers/md/md-linear.c
+++ b/drivers/md/md-linear.c
@@ -257,8 +257,7 @@ static bool linear_make_request(struct mddev *mddev, struct bio *bio)
 		bio_endio(bio);
 	} else {
 		if (mddev->gendisk)
-			trace_block_bio_remap(bio->bi_disk->queue,
-					      bio, disk_devt(mddev->gendisk),
+			trace_block_bio_remap(bio, disk_devt(mddev->gendisk),
 					      bio_sector);
 		mddev_check_writesame(mddev, bio);
 		mddev_check_write_zeroes(mddev, bio);
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 0065736f05b428..c555be0a8dce78 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -8591,9 +8591,8 @@ void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev,
 	bio_chain(discard_bio, bio);
 	bio_clone_blkg_association(discard_bio, bio);
 	if (mddev->gendisk)
-		trace_block_bio_remap(bdev_get_queue(rdev->bdev),
-			discard_bio, disk_devt(mddev->gendisk),
-			bio->bi_iter.bi_sector);
+		trace_block_bio_remap(discard_bio, disk_devt(mddev->gendisk),
+				      bio->bi_iter.bi_sector);
 	submit_bio_noacct(discard_bio);
 }
 EXPORT_SYMBOL(md_submit_discard_bio);
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 6f44177593a552..e5d7411cba9b46 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -571,8 +571,8 @@ static bool raid0_make_request(struct mddev *mddev, struct bio *bio)
 		tmp_dev->data_offset;
 
 	if (mddev->gendisk)
-		trace_block_bio_remap(bio->bi_disk->queue, bio,
-				disk_devt(mddev->gendisk), bio_sector);
+		trace_block_bio_remap(bio, disk_devt(mddev->gendisk),
+				      bio_sector);
 	mddev_check_writesame(mddev, bio);
 	mddev_check_write_zeroes(mddev, bio);
 	submit_bio_noacct(bio);
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 960d854c07f897..c0347997f6ff73 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1305,8 +1305,8 @@ static void raid1_read_request(struct mddev *mddev, struct bio *bio,
 	read_bio->bi_private = r1_bio;
 
 	if (mddev->gendisk)
-	        trace_block_bio_remap(read_bio->bi_disk->queue, read_bio,
-				disk_devt(mddev->gendisk), r1_bio->sector);
+	        trace_block_bio_remap(read_bio, disk_devt(mddev->gendisk),
+				      r1_bio->sector);
 
 	submit_bio_noacct(read_bio);
 }
@@ -1517,8 +1517,7 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
 		atomic_inc(&r1_bio->remaining);
 
 		if (mddev->gendisk)
-			trace_block_bio_remap(mbio->bi_disk->queue,
-					      mbio, disk_devt(mddev->gendisk),
+			trace_block_bio_remap(mbio, disk_devt(mddev->gendisk),
 					      r1_bio->sector);
 		/* flush_pending_writes() needs access to the rdev so...*/
 		mbio->bi_disk = (void *)conf->mirrors[i].rdev;
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index b7bca6703df814..a6f99fa0b32cfc 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1200,8 +1200,7 @@ static void raid10_read_request(struct mddev *mddev, struct bio *bio,
 	read_bio->bi_private = r10_bio;
 
 	if (mddev->gendisk)
-	        trace_block_bio_remap(read_bio->bi_disk->queue,
-	                              read_bio, disk_devt(mddev->gendisk),
+	        trace_block_bio_remap(read_bio, disk_devt(mddev->gendisk),
 	                              r10_bio->sector);
 	submit_bio_noacct(read_bio);
 	return;
@@ -1250,8 +1249,7 @@ static void raid10_write_one_disk(struct mddev *mddev, struct r10bio *r10_bio,
 	mbio->bi_private = r10_bio;
 
 	if (conf->mddev->gendisk)
-		trace_block_bio_remap(mbio->bi_disk->queue,
-				      mbio, disk_devt(conf->mddev->gendisk),
+		trace_block_bio_remap(mbio, disk_devt(conf->mddev->gendisk),
 				      r10_bio->sector);
 	/* flush_pending_writes() needs access to the rdev so...*/
 	mbio->bi_disk = (void *)rdev;
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 39343479ac2a94..3a90cc0e43ca8e 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -1222,9 +1222,9 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
 				set_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags);
 
 			if (conf->mddev->gendisk)
-				trace_block_bio_remap(bi->bi_disk->queue,
-						      bi, disk_devt(conf->mddev->gendisk),
-						      sh->dev[i].sector);
+				trace_block_bio_remap(bi,
+						disk_devt(conf->mddev->gendisk),
+						sh->dev[i].sector);
 			if (should_defer && op_is_write(op))
 				bio_list_add(&pending_bios, bi);
 			else
@@ -1272,9 +1272,9 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
 			if (op == REQ_OP_DISCARD)
 				rbi->bi_vcnt = 0;
 			if (conf->mddev->gendisk)
-				trace_block_bio_remap(rbi->bi_disk->queue,
-						      rbi, disk_devt(conf->mddev->gendisk),
-						      sh->dev[i].sector);
+				trace_block_bio_remap(rbi,
+						disk_devt(conf->mddev->gendisk),
+						sh->dev[i].sector);
 			if (should_defer && op_is_write(op))
 				bio_list_add(&pending_bios, rbi);
 			else
@@ -5468,8 +5468,7 @@ static int raid5_read_one_chunk(struct mddev *mddev, struct bio *raid_bio)
 		spin_unlock_irq(&conf->device_lock);
 
 		if (mddev->gendisk)
-			trace_block_bio_remap(align_bi->bi_disk->queue,
-					      align_bi, disk_devt(mddev->gendisk),
+			trace_block_bio_remap(align_bi, disk_devt(mddev->gendisk),
 					      raid_bio->bi_iter.bi_sector);
 		submit_bio_noacct(align_bi);
 		return 1;
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index 74896be40c1769..106cf5c44ee7ab 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -312,8 +312,7 @@ blk_qc_t nvme_ns_head_submit_bio(struct bio *bio)
 	if (likely(ns)) {
 		bio->bi_disk = ns->disk;
 		bio->bi_opf |= REQ_NVME_MPATH;
-		trace_block_bio_remap(bio->bi_disk->queue, bio,
-				      disk_devt(ns->head->disk),
+		trace_block_bio_remap(bio, disk_devt(ns->head->disk),
 				      bio->bi_iter.bi_sector);
 		ret = submit_bio_noacct(bio);
 	} else if (nvme_available_path(head)) {
diff --git a/include/trace/events/block.h b/include/trace/events/block.h
index b415e4cba84304..8fb89574d8677f 100644
--- a/include/trace/events/block.h
+++ b/include/trace/events/block.h
@@ -450,9 +450,8 @@ TRACE_EVENT(block_split,
 
 /**
  * block_bio_remap - map request for a logical device to the raw device
- * @q: queue holding the operation
  * @bio: revised operation
- * @dev: device for the operation
+ * @dev: original device for the operation
  * @from: original sector for the operation
  *
  * An operation for a logical device has been mapped to the
@@ -460,10 +459,9 @@ TRACE_EVENT(block_split,
  */
 TRACE_EVENT(block_bio_remap,
 
-	TP_PROTO(struct request_queue *q, struct bio *bio, dev_t dev,
-		 sector_t from),
+	TP_PROTO(struct bio *bio, dev_t dev, sector_t from),
 
-	TP_ARGS(q, bio, dev, from),
+	TP_ARGS(bio, dev, from),
 
 	TP_STRUCT__entry(
 		__field( dev_t,		dev		)
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 3ca6d62114f461..405637144a0389 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -993,20 +993,16 @@ static void blk_add_trace_split(void *ignore, struct bio *bio, unsigned int pdu)
 /**
  * blk_add_trace_bio_remap - Add a trace for a bio-remap operation
  * @ignore:	trace callback data parameter (not used)
- * @q:		queue the io is for
  * @bio:	the source bio
- * @dev:	target device
+ * @dev:	source device
  * @from:	source sector
  *
- * Description:
- *     Device mapper or raid target sometimes need to split a bio because
- *     it spans a stripe (or similar). Add a trace for that action.
- *
+ * Called after a bio is remapped to a different device and/or sector.
  **/
-static void blk_add_trace_bio_remap(void *ignore,
-				    struct request_queue *q, struct bio *bio,
-				    dev_t dev, sector_t from)
+static void blk_add_trace_bio_remap(void *ignore, struct bio *bio, dev_t dev,
+				    sector_t from)
 {
+	struct request_queue *q = bio->bi_disk->queue;
 	struct blk_trace *bt;
 	struct blk_io_trace_remap r;
 
-- 
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Re: [dm-devel] [PATCH 4/5] block: remove the request_queue argument to the block_bio_remap tracepoint

[Tejun Heo]

On Thu, Dec 03, 2020 at 05:21:38PM +0100, Christoph Hellwig wrote:
> The request_queue can trivially be derived from the bio.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
> Reviewed-by: Hannes Reinecke <hare@suse.de>

Acked-by: Tejun Heo <tj@kernel.org>

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Re: [dm-devel] [PATCH 4/5] block: remove the request_queue argument to the block_bio_remap tracepoint

[Chaitanya Kulkarni]

On 12/3/20 08:26, Christoph Hellwig wrote:
> The request_queue can trivially be derived from the bio.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
> Reviewed-by: Hannes Reinecke <hare@suse.de>
> ---

Looks good.

Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>




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[dm-devel] [PATCH 5/5] block: remove the request_queue to argument request based tracepoints

[Christoph Hellwig]

The request_queue can trivially be derived from the request.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
---
 block/blk-merge.c            |  2 +-
 block/blk-mq-sched.c         |  2 +-
 block/blk-mq.c               |  8 +++----
 drivers/md/dm-rq.c           |  2 +-
 drivers/s390/scsi/zfcp_fsf.c |  3 +--
 include/linux/blktrace_api.h |  5 ++--
 include/trace/events/block.h | 30 ++++++++++--------------
 kernel/trace/blktrace.c      | 44 ++++++++++++++----------------------
 8 files changed, 39 insertions(+), 57 deletions(-)

diff --git a/block/blk-merge.c b/block/blk-merge.c
index 4071daa88a5eaf..7497d86fff3834 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -799,7 +799,7 @@ static struct request *attempt_merge(struct request_queue *q,
 	 */
 	blk_account_io_merge_request(next);
 
-	trace_block_rq_merge(q, next);
+	trace_block_rq_merge(next);
 
 	/*
 	 * ownership of bio passed from next to req, return 'next' for
diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c
index d1eafe2c045caa..deff4e826e234d 100644
--- a/block/blk-mq-sched.c
+++ b/block/blk-mq-sched.c
@@ -386,7 +386,7 @@ EXPORT_SYMBOL_GPL(blk_mq_sched_try_insert_merge);
 
 void blk_mq_sched_request_inserted(struct request *rq)
 {
-	trace_block_rq_insert(rq->q, rq);
+	trace_block_rq_insert(rq);
 }
 EXPORT_SYMBOL_GPL(blk_mq_sched_request_inserted);
 
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 26eaf476f1e12b..ed21218188da65 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -733,7 +733,7 @@ void blk_mq_start_request(struct request *rq)
 {
 	struct request_queue *q = rq->q;
 
-	trace_block_rq_issue(q, rq);
+	trace_block_rq_issue(rq);
 
 	if (test_bit(QUEUE_FLAG_STATS, &q->queue_flags)) {
 		rq->io_start_time_ns = ktime_get_ns();
@@ -760,7 +760,7 @@ static void __blk_mq_requeue_request(struct request *rq)
 
 	blk_mq_put_driver_tag(rq);
 
-	trace_block_rq_requeue(q, rq);
+	trace_block_rq_requeue(rq);
 	rq_qos_requeue(q, rq);
 
 	if (blk_mq_request_started(rq)) {
@@ -1821,7 +1821,7 @@ static inline void __blk_mq_insert_req_list(struct blk_mq_hw_ctx *hctx,
 
 	lockdep_assert_held(&ctx->lock);
 
-	trace_block_rq_insert(hctx->queue, rq);
+	trace_block_rq_insert(rq);
 
 	if (at_head)
 		list_add(&rq->queuelist, &ctx->rq_lists[type]);
@@ -1878,7 +1878,7 @@ void blk_mq_insert_requests(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
 	 */
 	list_for_each_entry(rq, list, queuelist) {
 		BUG_ON(rq->mq_ctx != ctx);
-		trace_block_rq_insert(hctx->queue, rq);
+		trace_block_rq_insert(rq);
 	}
 
 	spin_lock(&ctx->lock);
diff --git a/drivers/md/dm-rq.c b/drivers/md/dm-rq.c
index 729a72ec30ccae..13b4385f4d5a92 100644
--- a/drivers/md/dm-rq.c
+++ b/drivers/md/dm-rq.c
@@ -397,7 +397,7 @@ static int map_request(struct dm_rq_target_io *tio)
 		}
 
 		/* The target has remapped the I/O so dispatch it */
-		trace_block_rq_remap(clone->q, clone, disk_devt(dm_disk(md)),
+		trace_block_rq_remap(clone, disk_devt(dm_disk(md)),
 				     blk_rq_pos(rq));
 		ret = dm_dispatch_clone_request(clone, rq);
 		if (ret == BLK_STS_RESOURCE || ret == BLK_STS_DEV_RESOURCE) {
diff --git a/drivers/s390/scsi/zfcp_fsf.c b/drivers/s390/scsi/zfcp_fsf.c
index 6cb963a0677714..37d450f4695281 100644
--- a/drivers/s390/scsi/zfcp_fsf.c
+++ b/drivers/s390/scsi/zfcp_fsf.c
@@ -2359,8 +2359,7 @@ static void zfcp_fsf_req_trace(struct zfcp_fsf_req *req, struct scsi_cmnd *scsi)
 		}
 	}
 
-	blk_add_driver_data(scsi->request->q, scsi->request, &blktrc,
-			    sizeof(blktrc));
+	blk_add_driver_data(scsi->request, &blktrc, sizeof(blktrc));
 }
 
 /**
diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h
index 3b6ff5902edce6..05556573b896a2 100644
--- a/include/linux/blktrace_api.h
+++ b/include/linux/blktrace_api.h
@@ -75,8 +75,7 @@ static inline bool blk_trace_note_message_enabled(struct request_queue *q)
 	return ret;
 }
 
-extern void blk_add_driver_data(struct request_queue *q, struct request *rq,
-				void *data, size_t len);
+extern void blk_add_driver_data(struct request *rq, void *data, size_t len);
 extern int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
 			   struct block_device *bdev,
 			   char __user *arg);
@@ -90,7 +89,7 @@ extern struct attribute_group blk_trace_attr_group;
 #else /* !CONFIG_BLK_DEV_IO_TRACE */
 # define blk_trace_ioctl(bdev, cmd, arg)		(-ENOTTY)
 # define blk_trace_shutdown(q)				do { } while (0)
-# define blk_add_driver_data(q, rq, data, len)		do {} while (0)
+# define blk_add_driver_data(rq, data, len)		do {} while (0)
 # define blk_trace_setup(q, name, dev, bdev, arg)	(-ENOTTY)
 # define blk_trace_startstop(q, start)			(-ENOTTY)
 # define blk_trace_remove(q)				(-ENOTTY)
diff --git a/include/trace/events/block.h b/include/trace/events/block.h
index 8fb89574d8677f..0d782663a005dc 100644
--- a/include/trace/events/block.h
+++ b/include/trace/events/block.h
@@ -64,7 +64,6 @@ DEFINE_EVENT(block_buffer, block_dirty_buffer,
 
 /**
  * block_rq_requeue - place block IO request back on a queue
- * @q: queue holding operation
  * @rq: block IO operation request
  *
  * The block operation request @rq is being placed back into queue
@@ -73,9 +72,9 @@ DEFINE_EVENT(block_buffer, block_dirty_buffer,
  */
 TRACE_EVENT(block_rq_requeue,
 
-	TP_PROTO(struct request_queue *q, struct request *rq),
+	TP_PROTO(struct request *rq),
 
-	TP_ARGS(q, rq),
+	TP_ARGS(rq),
 
 	TP_STRUCT__entry(
 		__field(  dev_t,	dev			)
@@ -147,9 +146,9 @@ TRACE_EVENT(block_rq_complete,
 
 DECLARE_EVENT_CLASS(block_rq,
 
-	TP_PROTO(struct request_queue *q, struct request *rq),
+	TP_PROTO(struct request *rq),
 
-	TP_ARGS(q, rq),
+	TP_ARGS(rq),
 
 	TP_STRUCT__entry(
 		__field(  dev_t,	dev			)
@@ -181,7 +180,6 @@ DECLARE_EVENT_CLASS(block_rq,
 
 /**
  * block_rq_insert - insert block operation request into queue
- * @q: target queue
  * @rq: block IO operation request
  *
  * Called immediately before block operation request @rq is inserted
@@ -191,14 +189,13 @@ DECLARE_EVENT_CLASS(block_rq,
  */
 DEFINE_EVENT(block_rq, block_rq_insert,
 
-	TP_PROTO(struct request_queue *q, struct request *rq),
+	TP_PROTO(struct request *rq),
 
-	TP_ARGS(q, rq)
+	TP_ARGS(rq)
 );
 
 /**
  * block_rq_issue - issue pending block IO request operation to device driver
- * @q: queue holding operation
  * @rq: block IO operation operation request
  *
  * Called when block operation request @rq from queue @q is sent to a
@@ -206,14 +203,13 @@ DEFINE_EVENT(block_rq, block_rq_insert,
  */
 DEFINE_EVENT(block_rq, block_rq_issue,
 
-	TP_PROTO(struct request_queue *q, struct request *rq),
+	TP_PROTO(struct request *rq),
 
-	TP_ARGS(q, rq)
+	TP_ARGS(rq)
 );
 
 /**
  * block_rq_merge - merge request with another one in the elevator
- * @q: queue holding operation
  * @rq: block IO operation operation request
  *
  * Called when block operation request @rq from queue @q is merged to another
@@ -221,9 +217,9 @@ DEFINE_EVENT(block_rq, block_rq_issue,
  */
 DEFINE_EVENT(block_rq, block_rq_merge,
 
-	TP_PROTO(struct request_queue *q, struct request *rq),
+	TP_PROTO(struct request *rq),
 
-	TP_ARGS(q, rq)
+	TP_ARGS(rq)
 );
 
 /**
@@ -491,7 +487,6 @@ TRACE_EVENT(block_bio_remap,
 
 /**
  * block_rq_remap - map request for a block operation request
- * @q: queue holding the operation
  * @rq: block IO operation request
  * @dev: device for the operation
  * @from: original sector for the operation
@@ -502,10 +497,9 @@ TRACE_EVENT(block_bio_remap,
  */
 TRACE_EVENT(block_rq_remap,
 
-	TP_PROTO(struct request_queue *q, struct request *rq, dev_t dev,
-		 sector_t from),
+	TP_PROTO(struct request *rq, dev_t dev, sector_t from),
 
-	TP_ARGS(q, rq, dev, from),
+	TP_ARGS(rq, dev, from),
 
 	TP_STRUCT__entry(
 		__field( dev_t,		dev		)
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 405637144a0389..7839a78205c243 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -795,12 +795,12 @@ static u64 blk_trace_bio_get_cgid(struct request_queue *q, struct bio *bio)
 #endif
 
 static u64
-blk_trace_request_get_cgid(struct request_queue *q, struct request *rq)
+blk_trace_request_get_cgid(struct request *rq)
 {
 	if (!rq->bio)
 		return 0;
 	/* Use the first bio */
-	return blk_trace_bio_get_cgid(q, rq->bio);
+	return blk_trace_bio_get_cgid(rq->q, rq->bio);
 }
 
 /*
@@ -841,40 +841,35 @@ static void blk_add_trace_rq(struct request *rq, int error,
 	rcu_read_unlock();
 }
 
-static void blk_add_trace_rq_insert(void *ignore,
-				    struct request_queue *q, struct request *rq)
+static void blk_add_trace_rq_insert(void *ignore, struct request *rq)
 {
 	blk_add_trace_rq(rq, 0, blk_rq_bytes(rq), BLK_TA_INSERT,
-			 blk_trace_request_get_cgid(q, rq));
+			 blk_trace_request_get_cgid(rq));
 }
 
-static void blk_add_trace_rq_issue(void *ignore,
-				   struct request_queue *q, struct request *rq)
+static void blk_add_trace_rq_issue(void *ignore, struct request *rq)
 {
 	blk_add_trace_rq(rq, 0, blk_rq_bytes(rq), BLK_TA_ISSUE,
-			 blk_trace_request_get_cgid(q, rq));
+			 blk_trace_request_get_cgid(rq));
 }
 
-static void blk_add_trace_rq_merge(void *ignore,
-				   struct request_queue *q, struct request *rq)
+static void blk_add_trace_rq_merge(void *ignore, struct request *rq)
 {
 	blk_add_trace_rq(rq, 0, blk_rq_bytes(rq), BLK_TA_BACKMERGE,
-			 blk_trace_request_get_cgid(q, rq));
+			 blk_trace_request_get_cgid(rq));
 }
 
-static void blk_add_trace_rq_requeue(void *ignore,
-				     struct request_queue *q,
-				     struct request *rq)
+static void blk_add_trace_rq_requeue(void *ignore, struct request *rq)
 {
 	blk_add_trace_rq(rq, 0, blk_rq_bytes(rq), BLK_TA_REQUEUE,
-			 blk_trace_request_get_cgid(q, rq));
+			 blk_trace_request_get_cgid(rq));
 }
 
 static void blk_add_trace_rq_complete(void *ignore, struct request *rq,
 			int error, unsigned int nr_bytes)
 {
 	blk_add_trace_rq(rq, error, nr_bytes, BLK_TA_COMPLETE,
-			 blk_trace_request_get_cgid(rq->q, rq));
+			 blk_trace_request_get_cgid(rq));
 }
 
 /**
@@ -1037,16 +1032,14 @@ static void blk_add_trace_bio_remap(void *ignore, struct bio *bio, dev_t dev,
  *     Add a trace for that action.
  *
  **/
-static void blk_add_trace_rq_remap(void *ignore,
-				   struct request_queue *q,
-				   struct request *rq, dev_t dev,
+static void blk_add_trace_rq_remap(void *ignore, struct request *rq, dev_t dev,
 				   sector_t from)
 {
 	struct blk_trace *bt;
 	struct blk_io_trace_remap r;
 
 	rcu_read_lock();
-	bt = rcu_dereference(q->blk_trace);
+	bt = rcu_dereference(rq->q->blk_trace);
 	if (likely(!bt)) {
 		rcu_read_unlock();
 		return;
@@ -1058,13 +1051,12 @@ static void blk_add_trace_rq_remap(void *ignore,
 
 	__blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq),
 			rq_data_dir(rq), 0, BLK_TA_REMAP, 0,
-			sizeof(r), &r, blk_trace_request_get_cgid(q, rq));
+			sizeof(r), &r, blk_trace_request_get_cgid(rq));
 	rcu_read_unlock();
 }
 
 /**
  * blk_add_driver_data - Add binary message with driver-specific data
- * @q:		queue the io is for
  * @rq:		io request
  * @data:	driver-specific data
  * @len:	length of driver-specific data
@@ -1073,14 +1065,12 @@ static void blk_add_trace_rq_remap(void *ignore,
  *     Some drivers might want to write driver-specific data per request.
  *
  **/
-void blk_add_driver_data(struct request_queue *q,
-			 struct request *rq,
-			 void *data, size_t len)
+void blk_add_driver_data(struct request *rq, void *data, size_t len)
 {
 	struct blk_trace *bt;
 
 	rcu_read_lock();
-	bt = rcu_dereference(q->blk_trace);
+	bt = rcu_dereference(rq->q->blk_trace);
 	if (likely(!bt)) {
 		rcu_read_unlock();
 		return;
@@ -1088,7 +1078,7 @@ void blk_add_driver_data(struct request_queue *q,
 
 	__blk_add_trace(bt, blk_rq_trace_sector(rq), blk_rq_bytes(rq), 0, 0,
 				BLK_TA_DRV_DATA, 0, len, data,
-				blk_trace_request_get_cgid(q, rq));
+				blk_trace_request_get_cgid(rq));
 	rcu_read_unlock();
 }
 EXPORT_SYMBOL_GPL(blk_add_driver_data);
-- 
2.29.2

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Re: [dm-devel] [PATCH 5/5] block: remove the request_queue to argument request based tracepoints

[Tejun Heo]

On Thu, Dec 03, 2020 at 05:21:39PM +0100, Christoph Hellwig wrote:
> The request_queue can trivially be derived from the request.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
> Reviewed-by: Hannes Reinecke <hare@suse.de>

Acked-by: Tejun Heo <tj@kernel.org>

Thanks!

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Re: [dm-devel] [PATCH 5/5] block: remove the request_queue to argument request based tracepoints

[Chaitanya Kulkarni]

On 12/3/20 08:26, Christoph Hellwig wrote:
> The request_queue can trivially be derived from the request.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
> Reviewed-by: Hannes Reinecke <hare@suse.de>
> ---

Looks good.

Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>




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Re: [dm-devel] block tracepoint cleanups v2

[Jens Axboe]

On 12/3/20 9:21 AM, Christoph Hellwig wrote:
> Hi Jens,
> 
> this series cleans up the block layer tracepoints by removing unused
> tracepoints or tracepoint arguments and consolidating the implementation
> of various bio based tracepoints.

Applied, thanks.

-- 
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[dm-devel] block tracepoint cleanups

[Christoph Hellwig]

Hi Jens,

this series cleans up the block layer tracepoints by removing unused
tracepoints or tracepoint arguments and consolidating the implementation
of various bio based tracepoints.

Diffstat:
 block/blk-core.c              |    4 
 block/blk-merge.c             |    8 -
 block/blk-mq-sched.c          |    2 
 block/blk-mq.c                |   10 -
 block/bounce.c                |    2 
 drivers/md/dm-rq.c            |    2 
 drivers/md/dm.c               |    5 
 drivers/md/md-linear.c        |    3 
 drivers/md/md.c               |    5 
 drivers/md/raid0.c            |    4 
 drivers/md/raid1.c            |    7 -
 drivers/md/raid10.c           |    6 -
 drivers/md/raid5.c            |   15 +-
 drivers/nvme/host/multipath.c |    3 
 drivers/s390/scsi/zfcp_fsf.c  |    3 
 include/linux/blktrace_api.h  |    5 
 include/trace/events/block.h  |  228 +++++++++---------------------------------
 kernel/trace/blktrace.c       |  126 ++++++-----------------
 18 files changed, 125 insertions(+), 313 deletions(-)

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[dm-devel] [PATCH 4/5] block: remove the request_queue argument to the block_bio_remap tracepoint

[Christoph Hellwig]

The request_queue can trivially be derived from the bio.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 block/blk-core.c              |  2 +-
 drivers/md/dm.c               |  3 +--
 drivers/md/md-linear.c        |  3 +--
 drivers/md/md.c               |  5 ++---
 drivers/md/raid0.c            |  4 ++--
 drivers/md/raid1.c            |  7 +++----
 drivers/md/raid10.c           |  6 ++----
 drivers/md/raid5.c            | 15 +++++++--------
 drivers/nvme/host/multipath.c |  3 +--
 include/trace/events/block.h  |  8 +++-----
 kernel/trace/blktrace.c       | 14 +++++---------
 11 files changed, 28 insertions(+), 42 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index cb24654983e1e4..96e5fcd7f071b6 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -758,7 +758,7 @@ static inline int blk_partition_remap(struct bio *bio)
 		if (bio_check_eod(bio, bdev_nr_sectors(p)))
 			goto out;
 		bio->bi_iter.bi_sector += p->bd_start_sect;
-		trace_block_bio_remap(bio->bi_disk->queue, bio, p->bd_dev,
+		trace_block_bio_remap(bio, p->bd_dev,
 				      bio->bi_iter.bi_sector -
 				      p->bd_start_sect);
 	}
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 9a5bd90779c7c4..5181907dc59537 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1276,8 +1276,7 @@ static blk_qc_t __map_bio(struct dm_target_io *tio)
 		break;
 	case DM_MAPIO_REMAPPED:
 		/* the bio has been remapped so dispatch it */
-		trace_block_bio_remap(clone->bi_disk->queue, clone,
-				      bio_dev(io->orig_bio), sector);
+		trace_block_bio_remap(clone, bio_dev(io->orig_bio), sector);
 		ret = submit_bio_noacct(clone);
 		break;
 	case DM_MAPIO_KILL:
diff --git a/drivers/md/md-linear.c b/drivers/md/md-linear.c
index 98f1b4b2bdcef8..68cac7d1927823 100644
--- a/drivers/md/md-linear.c
+++ b/drivers/md/md-linear.c
@@ -257,8 +257,7 @@ static bool linear_make_request(struct mddev *mddev, struct bio *bio)
 		bio_endio(bio);
 	} else {
 		if (mddev->gendisk)
-			trace_block_bio_remap(bio->bi_disk->queue,
-					      bio, disk_devt(mddev->gendisk),
+			trace_block_bio_remap(bio, disk_devt(mddev->gendisk),
 					      bio_sector);
 		mddev_check_writesame(mddev, bio);
 		mddev_check_write_zeroes(mddev, bio);
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 0065736f05b428..c555be0a8dce78 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -8591,9 +8591,8 @@ void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev,
 	bio_chain(discard_bio, bio);
 	bio_clone_blkg_association(discard_bio, bio);
 	if (mddev->gendisk)
-		trace_block_bio_remap(bdev_get_queue(rdev->bdev),
-			discard_bio, disk_devt(mddev->gendisk),
-			bio->bi_iter.bi_sector);
+		trace_block_bio_remap(discard_bio, disk_devt(mddev->gendisk),
+				      bio->bi_iter.bi_sector);
 	submit_bio_noacct(discard_bio);
 }
 EXPORT_SYMBOL(md_submit_discard_bio);
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 6f44177593a552..e5d7411cba9b46 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -571,8 +571,8 @@ static bool raid0_make_request(struct mddev *mddev, struct bio *bio)
 		tmp_dev->data_offset;
 
 	if (mddev->gendisk)
-		trace_block_bio_remap(bio->bi_disk->queue, bio,
-				disk_devt(mddev->gendisk), bio_sector);
+		trace_block_bio_remap(bio, disk_devt(mddev->gendisk),
+				      bio_sector);
 	mddev_check_writesame(mddev, bio);
 	mddev_check_write_zeroes(mddev, bio);
 	submit_bio_noacct(bio);
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 960d854c07f897..c0347997f6ff73 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1305,8 +1305,8 @@ static void raid1_read_request(struct mddev *mddev, struct bio *bio,
 	read_bio->bi_private = r1_bio;
 
 	if (mddev->gendisk)
-	        trace_block_bio_remap(read_bio->bi_disk->queue, read_bio,
-				disk_devt(mddev->gendisk), r1_bio->sector);
+	        trace_block_bio_remap(read_bio, disk_devt(mddev->gendisk),
+				      r1_bio->sector);
 
 	submit_bio_noacct(read_bio);
 }
@@ -1517,8 +1517,7 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
 		atomic_inc(&r1_bio->remaining);
 
 		if (mddev->gendisk)
-			trace_block_bio_remap(mbio->bi_disk->queue,
-					      mbio, disk_devt(mddev->gendisk),
+			trace_block_bio_remap(mbio, disk_devt(mddev->gendisk),
 					      r1_bio->sector);
 		/* flush_pending_writes() needs access to the rdev so...*/
 		mbio->bi_disk = (void *)conf->mirrors[i].rdev;
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index b7bca6703df814..a6f99fa0b32cfc 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1200,8 +1200,7 @@ static void raid10_read_request(struct mddev *mddev, struct bio *bio,
 	read_bio->bi_private = r10_bio;
 
 	if (mddev->gendisk)
-	        trace_block_bio_remap(read_bio->bi_disk->queue,
-	                              read_bio, disk_devt(mddev->gendisk),
+	        trace_block_bio_remap(read_bio, disk_devt(mddev->gendisk),
 	                              r10_bio->sector);
 	submit_bio_noacct(read_bio);
 	return;
@@ -1250,8 +1249,7 @@ static void raid10_write_one_disk(struct mddev *mddev, struct r10bio *r10_bio,
 	mbio->bi_private = r10_bio;
 
 	if (conf->mddev->gendisk)
-		trace_block_bio_remap(mbio->bi_disk->queue,
-				      mbio, disk_devt(conf->mddev->gendisk),
+		trace_block_bio_remap(mbio, disk_devt(conf->mddev->gendisk),
 				      r10_bio->sector);
 	/* flush_pending_writes() needs access to the rdev so...*/
 	mbio->bi_disk = (void *)rdev;
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 39343479ac2a94..3a90cc0e43ca8e 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -1222,9 +1222,9 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
 				set_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags);
 
 			if (conf->mddev->gendisk)
-				trace_block_bio_remap(bi->bi_disk->queue,
-						      bi, disk_devt(conf->mddev->gendisk),
-						      sh->dev[i].sector);
+				trace_block_bio_remap(bi,
+						disk_devt(conf->mddev->gendisk),
+						sh->dev[i].sector);
 			if (should_defer && op_is_write(op))
 				bio_list_add(&pending_bios, bi);
 			else
@@ -1272,9 +1272,9 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
 			if (op == REQ_OP_DISCARD)
 				rbi->bi_vcnt = 0;
 			if (conf->mddev->gendisk)
-				trace_block_bio_remap(rbi->bi_disk->queue,
-						      rbi, disk_devt(conf->mddev->gendisk),
-						      sh->dev[i].sector);
+				trace_block_bio_remap(rbi,
+						disk_devt(conf->mddev->gendisk),
+						sh->dev[i].sector);
 			if (should_defer && op_is_write(op))
 				bio_list_add(&pending_bios, rbi);
 			else
@@ -5468,8 +5468,7 @@ static int raid5_read_one_chunk(struct mddev *mddev, struct bio *raid_bio)
 		spin_unlock_irq(&conf->device_lock);
 
 		if (mddev->gendisk)
-			trace_block_bio_remap(align_bi->bi_disk->queue,
-					      align_bi, disk_devt(mddev->gendisk),
+			trace_block_bio_remap(align_bi, disk_devt(mddev->gendisk),
 					      raid_bio->bi_iter.bi_sector);
 		submit_bio_noacct(align_bi);
 		return 1;
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index 74896be40c1769..106cf5c44ee7ab 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -312,8 +312,7 @@ blk_qc_t nvme_ns_head_submit_bio(struct bio *bio)
 	if (likely(ns)) {
 		bio->bi_disk = ns->disk;
 		bio->bi_opf |= REQ_NVME_MPATH;
-		trace_block_bio_remap(bio->bi_disk->queue, bio,
-				      disk_devt(ns->head->disk),
+		trace_block_bio_remap(bio, disk_devt(ns->head->disk),
 				      bio->bi_iter.bi_sector);
 		ret = submit_bio_noacct(bio);
 	} else if (nvme_available_path(head)) {
diff --git a/include/trace/events/block.h b/include/trace/events/block.h
index b415e4cba84304..8fb89574d8677f 100644
--- a/include/trace/events/block.h
+++ b/include/trace/events/block.h
@@ -450,9 +450,8 @@ TRACE_EVENT(block_split,
 
 /**
  * block_bio_remap - map request for a logical device to the raw device
- * @q: queue holding the operation
  * @bio: revised operation
- * @dev: device for the operation
+ * @dev: original device for the operation
  * @from: original sector for the operation
  *
  * An operation for a logical device has been mapped to the
@@ -460,10 +459,9 @@ TRACE_EVENT(block_split,
  */
 TRACE_EVENT(block_bio_remap,
 
-	TP_PROTO(struct request_queue *q, struct bio *bio, dev_t dev,
-		 sector_t from),
+	TP_PROTO(struct bio *bio, dev_t dev, sector_t from),
 
-	TP_ARGS(q, bio, dev, from),
+	TP_ARGS(bio, dev, from),
 
 	TP_STRUCT__entry(
 		__field( dev_t,		dev		)
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 3ca6d62114f461..405637144a0389 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -993,20 +993,16 @@ static void blk_add_trace_split(void *ignore, struct bio *bio, unsigned int pdu)
 /**
  * blk_add_trace_bio_remap - Add a trace for a bio-remap operation
  * @ignore:	trace callback data parameter (not used)
- * @q:		queue the io is for
  * @bio:	the source bio
- * @dev:	target device
+ * @dev:	source device
  * @from:	source sector
  *
- * Description:
- *     Device mapper or raid target sometimes need to split a bio because
- *     it spans a stripe (or similar). Add a trace for that action.
- *
+ * Called after a bio is remapped to a different device and/or sector.
  **/
-static void blk_add_trace_bio_remap(void *ignore,
-				    struct request_queue *q, struct bio *bio,
-				    dev_t dev, sector_t from)
+static void blk_add_trace_bio_remap(void *ignore, struct bio *bio, dev_t dev,
+				    sector_t from)
 {
+	struct request_queue *q = bio->bi_disk->queue;
 	struct blk_trace *bt;
 	struct blk_io_trace_remap r;
 
-- 
2.29.2

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Re: [dm-devel] [PATCH 4/5] block: remove the request_queue argument to the block_bio_remap tracepoint

[Damien Le Moal]

On 2020/12/01 3:09, Christoph Hellwig wrote:
> The request_queue can trivially be derived from the bio.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  block/blk-core.c              |  2 +-
>  drivers/md/dm.c               |  3 +--
>  drivers/md/md-linear.c        |  3 +--
>  drivers/md/md.c               |  5 ++---
>  drivers/md/raid0.c            |  4 ++--
>  drivers/md/raid1.c            |  7 +++----
>  drivers/md/raid10.c           |  6 ++----
>  drivers/md/raid5.c            | 15 +++++++--------
>  drivers/nvme/host/multipath.c |  3 +--
>  include/trace/events/block.h  |  8 +++-----
>  kernel/trace/blktrace.c       | 14 +++++---------
>  11 files changed, 28 insertions(+), 42 deletions(-)
> 
> diff --git a/block/blk-core.c b/block/blk-core.c
> index cb24654983e1e4..96e5fcd7f071b6 100644
> --- a/block/blk-core.c
> +++ b/block/blk-core.c
> @@ -758,7 +758,7 @@ static inline int blk_partition_remap(struct bio *bio)
>  		if (bio_check_eod(bio, bdev_nr_sectors(p)))
>  			goto out;
>  		bio->bi_iter.bi_sector += p->bd_start_sect;
> -		trace_block_bio_remap(bio->bi_disk->queue, bio, p->bd_dev,
> +		trace_block_bio_remap(bio, p->bd_dev,
>  				      bio->bi_iter.bi_sector -
>  				      p->bd_start_sect);
>  	}
> diff --git a/drivers/md/dm.c b/drivers/md/dm.c
> index 9a5bd90779c7c4..5181907dc59537 100644
> --- a/drivers/md/dm.c
> +++ b/drivers/md/dm.c
> @@ -1276,8 +1276,7 @@ static blk_qc_t __map_bio(struct dm_target_io *tio)
>  		break;
>  	case DM_MAPIO_REMAPPED:
>  		/* the bio has been remapped so dispatch it */
> -		trace_block_bio_remap(clone->bi_disk->queue, clone,
> -				      bio_dev(io->orig_bio), sector);
> +		trace_block_bio_remap(clone, bio_dev(io->orig_bio), sector);
>  		ret = submit_bio_noacct(clone);
>  		break;
>  	case DM_MAPIO_KILL:
> diff --git a/drivers/md/md-linear.c b/drivers/md/md-linear.c
> index 98f1b4b2bdcef8..68cac7d1927823 100644
> --- a/drivers/md/md-linear.c
> +++ b/drivers/md/md-linear.c
> @@ -257,8 +257,7 @@ static bool linear_make_request(struct mddev *mddev, struct bio *bio)
>  		bio_endio(bio);
>  	} else {
>  		if (mddev->gendisk)
> -			trace_block_bio_remap(bio->bi_disk->queue,
> -					      bio, disk_devt(mddev->gendisk),
> +			trace_block_bio_remap(bio, disk_devt(mddev->gendisk),
>  					      bio_sector);
>  		mddev_check_writesame(mddev, bio);
>  		mddev_check_write_zeroes(mddev, bio);
> diff --git a/drivers/md/md.c b/drivers/md/md.c
> index 0065736f05b428..c555be0a8dce78 100644
> --- a/drivers/md/md.c
> +++ b/drivers/md/md.c
> @@ -8591,9 +8591,8 @@ void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev,
>  	bio_chain(discard_bio, bio);
>  	bio_clone_blkg_association(discard_bio, bio);
>  	if (mddev->gendisk)
> -		trace_block_bio_remap(bdev_get_queue(rdev->bdev),
> -			discard_bio, disk_devt(mddev->gendisk),
> -			bio->bi_iter.bi_sector);
> +		trace_block_bio_remap(discard_bio, disk_devt(mddev->gendisk),
> +				      bio->bi_iter.bi_sector);
>  	submit_bio_noacct(discard_bio);
>  }
>  EXPORT_SYMBOL(md_submit_discard_bio);
> diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
> index 6f44177593a552..e5d7411cba9b46 100644
> --- a/drivers/md/raid0.c
> +++ b/drivers/md/raid0.c
> @@ -571,8 +571,8 @@ static bool raid0_make_request(struct mddev *mddev, struct bio *bio)
>  		tmp_dev->data_offset;
>  
>  	if (mddev->gendisk)
> -		trace_block_bio_remap(bio->bi_disk->queue, bio,
> -				disk_devt(mddev->gendisk), bio_sector);
> +		trace_block_bio_remap(bio, disk_devt(mddev->gendisk),
> +				      bio_sector);
>  	mddev_check_writesame(mddev, bio);
>  	mddev_check_write_zeroes(mddev, bio);
>  	submit_bio_noacct(bio);
> diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
> index 960d854c07f897..c0347997f6ff73 100644
> --- a/drivers/md/raid1.c
> +++ b/drivers/md/raid1.c
> @@ -1305,8 +1305,8 @@ static void raid1_read_request(struct mddev *mddev, struct bio *bio,
>  	read_bio->bi_private = r1_bio;
>  
>  	if (mddev->gendisk)
> -	        trace_block_bio_remap(read_bio->bi_disk->queue, read_bio,
> -				disk_devt(mddev->gendisk), r1_bio->sector);
> +	        trace_block_bio_remap(read_bio, disk_devt(mddev->gendisk),
> +				      r1_bio->sector);
>  
>  	submit_bio_noacct(read_bio);
>  }
> @@ -1517,8 +1517,7 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
>  		atomic_inc(&r1_bio->remaining);
>  
>  		if (mddev->gendisk)
> -			trace_block_bio_remap(mbio->bi_disk->queue,
> -					      mbio, disk_devt(mddev->gendisk),
> +			trace_block_bio_remap(mbio, disk_devt(mddev->gendisk),
>  					      r1_bio->sector);
>  		/* flush_pending_writes() needs access to the rdev so...*/
>  		mbio->bi_disk = (void *)conf->mirrors[i].rdev;
> diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
> index b7bca6703df814..a6f99fa0b32cfc 100644
> --- a/drivers/md/raid10.c
> +++ b/drivers/md/raid10.c
> @@ -1200,8 +1200,7 @@ static void raid10_read_request(struct mddev *mddev, struct bio *bio,
>  	read_bio->bi_private = r10_bio;
>  
>  	if (mddev->gendisk)
> -	        trace_block_bio_remap(read_bio->bi_disk->queue,
> -	                              read_bio, disk_devt(mddev->gendisk),
> +	        trace_block_bio_remap(read_bio, disk_devt(mddev->gendisk),
>  	                              r10_bio->sector);
>  	submit_bio_noacct(read_bio);
>  	return;
> @@ -1250,8 +1249,7 @@ static void raid10_write_one_disk(struct mddev *mddev, struct r10bio *r10_bio,
>  	mbio->bi_private = r10_bio;
>  
>  	if (conf->mddev->gendisk)
> -		trace_block_bio_remap(mbio->bi_disk->queue,
> -				      mbio, disk_devt(conf->mddev->gendisk),
> +		trace_block_bio_remap(mbio, disk_devt(conf->mddev->gendisk),
>  				      r10_bio->sector);
>  	/* flush_pending_writes() needs access to the rdev so...*/
>  	mbio->bi_disk = (void *)rdev;
> diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
> index 39343479ac2a94..3a90cc0e43ca8e 100644
> --- a/drivers/md/raid5.c
> +++ b/drivers/md/raid5.c
> @@ -1222,9 +1222,9 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
>  				set_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags);
>  
>  			if (conf->mddev->gendisk)
> -				trace_block_bio_remap(bi->bi_disk->queue,
> -						      bi, disk_devt(conf->mddev->gendisk),
> -						      sh->dev[i].sector);
> +				trace_block_bio_remap(bi,
> +						disk_devt(conf->mddev->gendisk),
> +						sh->dev[i].sector);
>  			if (should_defer && op_is_write(op))
>  				bio_list_add(&pending_bios, bi);
>  			else
> @@ -1272,9 +1272,9 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
>  			if (op == REQ_OP_DISCARD)
>  				rbi->bi_vcnt = 0;
>  			if (conf->mddev->gendisk)
> -				trace_block_bio_remap(rbi->bi_disk->queue,
> -						      rbi, disk_devt(conf->mddev->gendisk),
> -						      sh->dev[i].sector);
> +				trace_block_bio_remap(rbi,
> +						disk_devt(conf->mddev->gendisk),
> +						sh->dev[i].sector);
>  			if (should_defer && op_is_write(op))
>  				bio_list_add(&pending_bios, rbi);
>  			else
> @@ -5468,8 +5468,7 @@ static int raid5_read_one_chunk(struct mddev *mddev, struct bio *raid_bio)
>  		spin_unlock_irq(&conf->device_lock);
>  
>  		if (mddev->gendisk)
> -			trace_block_bio_remap(align_bi->bi_disk->queue,
> -					      align_bi, disk_devt(mddev->gendisk),
> +			trace_block_bio_remap(align_bi, disk_devt(mddev->gendisk),
>  					      raid_bio->bi_iter.bi_sector);
>  		submit_bio_noacct(align_bi);
>  		return 1;
> diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
> index 74896be40c1769..106cf5c44ee7ab 100644
> --- a/drivers/nvme/host/multipath.c
> +++ b/drivers/nvme/host/multipath.c
> @@ -312,8 +312,7 @@ blk_qc_t nvme_ns_head_submit_bio(struct bio *bio)
>  	if (likely(ns)) {
>  		bio->bi_disk = ns->disk;
>  		bio->bi_opf |= REQ_NVME_MPATH;
> -		trace_block_bio_remap(bio->bi_disk->queue, bio,
> -				      disk_devt(ns->head->disk),
> +		trace_block_bio_remap(bio, disk_devt(ns->head->disk),
>  				      bio->bi_iter.bi_sector);
>  		ret = submit_bio_noacct(bio);
>  	} else if (nvme_available_path(head)) {
> diff --git a/include/trace/events/block.h b/include/trace/events/block.h
> index b415e4cba84304..8fb89574d8677f 100644
> --- a/include/trace/events/block.h
> +++ b/include/trace/events/block.h
> @@ -450,9 +450,8 @@ TRACE_EVENT(block_split,
>  
>  /**
>   * block_bio_remap - map request for a logical device to the raw device
> - * @q: queue holding the operation
>   * @bio: revised operation
> - * @dev: device for the operation
> + * @dev: original device for the operation
>   * @from: original sector for the operation
>   *
>   * An operation for a logical device has been mapped to the
> @@ -460,10 +459,9 @@ TRACE_EVENT(block_split,
>   */
>  TRACE_EVENT(block_bio_remap,
>  
> -	TP_PROTO(struct request_queue *q, struct bio *bio, dev_t dev,
> -		 sector_t from),
> +	TP_PROTO(struct bio *bio, dev_t dev, sector_t from),
>  
> -	TP_ARGS(q, bio, dev, from),
> +	TP_ARGS(bio, dev, from),
>  
>  	TP_STRUCT__entry(
>  		__field( dev_t,		dev		)
> diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
> index 3ca6d62114f461..405637144a0389 100644
> --- a/kernel/trace/blktrace.c
> +++ b/kernel/trace/blktrace.c
> @@ -993,20 +993,16 @@ static void blk_add_trace_split(void *ignore, struct bio *bio, unsigned int pdu)
>  /**
>   * blk_add_trace_bio_remap - Add a trace for a bio-remap operation
>   * @ignore:	trace callback data parameter (not used)
> - * @q:		queue the io is for
>   * @bio:	the source bio
> - * @dev:	target device
> + * @dev:	source device
>   * @from:	source sector
>   *
> - * Description:
> - *     Device mapper or raid target sometimes need to split a bio because
> - *     it spans a stripe (or similar). Add a trace for that action.
> - *
> + * Called after a bio is remapped to a different device and/or sector.
>   **/
> -static void blk_add_trace_bio_remap(void *ignore,
> -				    struct request_queue *q, struct bio *bio,
> -				    dev_t dev, sector_t from)
> +static void blk_add_trace_bio_remap(void *ignore, struct bio *bio, dev_t dev,
> +				    sector_t from)
>  {
> +	struct request_queue *q = bio->bi_disk->queue;
>  	struct blk_trace *bt;
>  	struct blk_io_trace_remap r;
>  
> 

Looks good.

Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>

-- 
Damien Le Moal
Western Digital Research



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Re: [dm-devel] [PATCH 4/5] block: remove the request_queue argument to the block_bio_remap tracepoint

[Hannes Reinecke]

On 11/30/20 6:58 PM, Christoph Hellwig wrote:
> The request_queue can trivially be derived from the bio.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>   block/blk-core.c              |  2 +-
>   drivers/md/dm.c               |  3 +--
>   drivers/md/md-linear.c        |  3 +--
>   drivers/md/md.c               |  5 ++---
>   drivers/md/raid0.c            |  4 ++--
>   drivers/md/raid1.c            |  7 +++----
>   drivers/md/raid10.c           |  6 ++----
>   drivers/md/raid5.c            | 15 +++++++--------
>   drivers/nvme/host/multipath.c |  3 +--
>   include/trace/events/block.h  |  8 +++-----
>   kernel/trace/blktrace.c       | 14 +++++---------
>   11 files changed, 28 insertions(+), 42 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare@suse.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                Kernel Storage Architect
hare@suse.de                              +49 911 74053 688
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