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block: add @req to bio_{front|back}_merge tracepoints 

bio_{front|back}_merge tracepoints report a bio merging into an
existing request but didn't specify which request the bio is being
merged into.  Add @req to it.  This makes it impossible to share the
event template with block_bio_queue - split it out.

@req isn't used or exported to userland at this point and there is no
userland visible behavior change.  Later changes will make use of the
extra parameter.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo 2013-01-11 13:06:34 -08:00 committed by Jens Axboe
parent 3a366e614d
commit 8c1cf6bb02
3 changed files with 38 additions and 13 deletions
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4
block/blk-core.c
View File

@ -1347,7 +1347,7 @@ static bool bio_attempt_back_merge(struct request_queue *q, struct request *req,
if (!ll_back_merge_fn(q, req, bio))
return false;
trace_block_bio_backmerge(q, bio);
trace_block_bio_backmerge(q, req, bio);
if ((req->cmd_flags & REQ_FAILFAST_MASK) != ff)
blk_rq_set_mixed_merge(req);
@ -1369,7 +1369,7 @@ static bool bio_attempt_front_merge(struct request_queue *q,
if (!ll_front_merge_fn(q, req, bio))
return false;
trace_block_bio_frontmerge(q, bio);
trace_block_bio_frontmerge(q, req, bio);
if ((req->cmd_flags & REQ_FAILFAST_MASK) != ff)
blk_rq_set_mixed_merge(req);

45
include/trace/events/block.h
View File

@ -241,11 +241,11 @@ TRACE_EVENT(block_bio_complete,
__entry->nr_sector, __entry->error)
);
DECLARE_EVENT_CLASS(block_bio,
DECLARE_EVENT_CLASS(block_bio_merge,
TP_PROTO(struct request_queue *q, struct bio *bio),
TP_PROTO(struct request_queue *q, struct request *rq, struct bio *bio),
TP_ARGS(q, bio),
TP_ARGS(q, rq, bio),
TP_STRUCT__entry(
__field( dev_t, dev )
@ -272,31 +272,33 @@ DECLARE_EVENT_CLASS(block_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.
*/
DEFINE_EVENT(block_bio, block_bio_backmerge,
DEFINE_EVENT(block_bio_merge, block_bio_backmerge,
TP_PROTO(struct request_queue *q, struct bio *bio),
TP_PROTO(struct request_queue *q, struct request *rq, struct bio *bio),
TP_ARGS(q, bio)
TP_ARGS(q, rq, 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.
*/
DEFINE_EVENT(block_bio, block_bio_frontmerge,
DEFINE_EVENT(block_bio_merge, block_bio_frontmerge,
TP_PROTO(struct request_queue *q, struct bio *bio),
TP_PROTO(struct request_queue *q, struct request *rq, struct bio *bio),
TP_ARGS(q, bio)
TP_ARGS(q, rq, bio)
);
/**
@ -306,11 +308,32 @@ DEFINE_EVENT(block_bio, block_bio_frontmerge,
*
* About to place the block IO operation @bio into queue @q.
*/
DEFINE_EVENT(block_bio, block_bio_queue,
TRACE_EVENT(block_bio_queue,
TP_PROTO(struct request_queue *q, struct bio *bio),
TP_ARGS(q, 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->bi_bdev->bd_dev;
__entry->sector = bio->bi_sector;
__entry->nr_sector = bio->bi_size >> 9;
blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->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,

2
kernel/trace/blktrace.c
View File

@ -803,6 +803,7 @@ static void blk_add_trace_bio_complete(void *ignore, struct bio *bio, int error)
static void blk_add_trace_bio_backmerge(void *ignore,
struct request_queue *q,
struct request *rq,
struct bio *bio)
{
blk_add_trace_bio(q, bio, BLK_TA_BACKMERGE, 0);
@ -810,6 +811,7 @@ static void blk_add_trace_bio_backmerge(void *ignore,
static void blk_add_trace_bio_frontmerge(void *ignore,
struct request_queue *q,
struct request *rq,
struct bio *bio)
{
blk_add_trace_bio(q, bio, BLK_TA_FRONTMERGE, 0);