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Subject[PATCH 1/3] block: add missing block_bio_complete() tracepoint
Date
The block_bio_complete() TP has been missed so long,
so that bio-based drivers haven't been able to trace
its IO behavior. Add it.

In some rare cases, such as loop_switch, @bio->bi_bdev
can be NULL. Thus convert it to TRACE_EVENT_CONDITION()
as Steven suggested.

From now on, request-based drivers will also get
BLK_TA_COMPLETEs for all bio's in requests. This needs
to be handled in userland properly.

Signed-off-by: Namhyung Kim <namhyung.kim@lge.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
---
fs/bio.c | 2 ++
include/trace/events/block.h | 4 +++-
2 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/fs/bio.c b/fs/bio.c
index b1fe82cf88cf..14c03eaf384e 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -1447,6 +1447,8 @@ void bio_endio(struct bio *bio, int error)
else if (!test_bit(BIO_UPTODATE, &bio->bi_flags))
error = -EIO;

+ trace_block_bio_complete(bdev_get_queue(bio->bi_bdev), bio, error);
+
if (bio->bi_end_io)
bio->bi_end_io(bio, error);
}
diff --git a/include/trace/events/block.h b/include/trace/events/block.h
index 05c5e61f0a7c..96955f4828b3 100644
--- a/include/trace/events/block.h
+++ b/include/trace/events/block.h
@@ -213,12 +213,14 @@ TRACE_EVENT(block_bio_bounce,
* This tracepoint indicates there is no further work to do on this
* block IO operation @bio.
*/
-TRACE_EVENT(block_bio_complete,
+TRACE_EVENT_CONDITION(block_bio_complete,

TP_PROTO(struct request_queue *q, struct bio *bio, int error),

TP_ARGS(q, bio, error),

+ TP_CONDITION(bio->bi_bdev != NULL),
+
TP_STRUCT__entry(
__field( dev_t, dev )
__field( sector_t, sector )
--
1.7.9.rc1.dirty


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