path: root/include/trace
diff options
authorTejun Heo <tj@kernel.org>2013-01-11 13:06:33 -0800
committerJens Axboe <axboe@kernel.dk>2013-01-14 15:00:36 +0100
commit3a366e614d0837d9fc23f78cdb1a1186ebc3387f (patch)
tree5be6ec716687234ac1e6202db62c84ee1d2246be /include/trace
parentac9a19745196388ae5d828c0be7a1d6e472101f3 (diff)
block: add missing block_bio_complete() tracepoint
bio completion didn't kick block_bio_complete TP. Only dm was explicitly triggering the TP on IO completion. This makes block_bio_complete TP useless for tracers which want to know about bios, and all other bio based drivers skip generating blktrace completion events. This patch makes all bio completions via bio_endio() generate block_bio_complete TP. * Explicit trace_block_bio_complete() invocation removed from dm and the trace point is unexported. * @rq dropped from trace_block_bio_complete(). bios may fly around w/o queue associated. Verifying and accessing the assocaited queue belongs to TP probes. * blktrace now gets both request and bio completions. Make it ignore bio completions if request completion path is happening. This makes all bio based drivers generate blktrace completion events properly and makes the block_bio_complete TP actually useful. v2: With this change, block_bio_complete TP could be invoked on sg commands which have bio's with %NULL bi_bdev. Update TP assignment code to check whether bio->bi_bdev is %NULL before dereferencing. Signed-off-by: Tejun Heo <tj@kernel.org> Original-patch-by: Namhyung Kim <namhyung@gmail.com> Cc: Tejun Heo <tj@kernel.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Alasdair Kergon <agk@redhat.com> Cc: dm-devel@redhat.com Cc: Neil Brown <neilb@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/trace')
1 files changed, 4 insertions, 4 deletions
diff --git a/include/trace/events/block.h b/include/trace/events/block.h
index 05c5e61f0a7..8a168db9a64 100644
--- a/include/trace/events/block.h
+++ b/include/trace/events/block.h
@@ -206,7 +206,6 @@ TRACE_EVENT(block_bio_bounce,
* block_bio_complete - completed all work on the block operation
- * @q: queue holding the block operation
* @bio: block operation completed
* @error: io error value
@@ -215,9 +214,9 @@ TRACE_EVENT(block_bio_bounce,
- TP_PROTO(struct request_queue *q, struct bio *bio, int error),
+ TP_PROTO(struct bio *bio, int error),
- TP_ARGS(q, bio, error),
+ TP_ARGS(bio, error),
__field( dev_t, dev )
@@ -228,7 +227,8 @@ TRACE_EVENT(block_bio_complete,
- __entry->dev = bio->bi_bdev->bd_dev;
+ __entry->dev = bio->bi_bdev ?
+ bio->bi_bdev->bd_dev : 0;
__entry->sector = bio->bi_sector;
__entry->nr_sector = bio->bi_size >> 9;
__entry->error = error;