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block: remove the error argument to the block_bio_complete tracepoint

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The status can be trivially derived from the bio itself.  That also avoid
callers like NVMe to incorrectly pass a blk_status_t instead of the errno,
and the overhead of translating the blk_status_t to the errno in the I/O
completion fast path when no tracing is enabled.

Fixes: 35fe0d12c8 ("nvme: trace bio completion")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2020-06-03 07:14:43 +02:00 committed by Jens Axboe
parent 6ac92fb5cd
commit d24de76af8
4 changed files with 8 additions and 10 deletions
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3
block/bio.c
View File

@ -1434,8 +1434,7 @@ void bio_endio(struct bio *bio)
}
if (bio->bi_disk && bio_flagged(bio, BIO_TRACE_COMPLETION)) {
trace_block_bio_complete(bio->bi_disk->queue, bio,
blk_status_to_errno(bio->bi_status));
trace_block_bio_complete(bio->bi_disk->queue, bio);
bio_clear_flag(bio, BIO_TRACE_COMPLETION);
}

3
drivers/nvme/host/nvme.h
View File

@ -599,8 +599,7 @@ static inline void nvme_trace_bio_complete(struct request *req,
struct nvme_ns *ns = req->q->queuedata;
if (req->cmd_flags & REQ_NVME_MPATH)
trace_block_bio_complete(ns->head->disk->queue,
req->bio, status);
trace_block_bio_complete(ns->head->disk->queue, req->bio);
}
extern struct device_attribute dev_attr_ana_grpid;

6
include/trace/events/block.h
View File

@ -261,9 +261,9 @@ TRACE_EVENT(block_bio_bounce,
*/
TRACE_EVENT(block_bio_complete,
TP_PROTO(struct request_queue *q, struct bio *bio, int error),
TP_PROTO(struct request_queue *q, struct bio *bio),
TP_ARGS(q, bio, error),
TP_ARGS(q, bio),
TP_STRUCT__entry(
__field( dev_t, dev )
@ -277,7 +277,7 @@ TRACE_EVENT(block_bio_complete,
__entry->dev = bio_dev(bio);
__entry->sector = bio->bi_iter.bi_sector;
__entry->nr_sector = bio_sectors(bio);
__entry->error = error;
__entry->error = blk_status_to_errno(bio->bi_status);
blk_fill_rwbs(__entry->rwbs, bio->bi_opf, bio->bi_iter.bi_size);
),

6
kernel/trace/blktrace.c
View File

@ -885,10 +885,10 @@ static void blk_add_trace_bio_bounce(void *ignore,
}
static void blk_add_trace_bio_complete(void *ignore,
struct request_queue *q, struct bio *bio,
int error)
struct request_queue *q, struct bio *bio)
{
blk_add_trace_bio(q, bio, BLK_TA_COMPLETE, error);
blk_add_trace_bio(q, bio, BLK_TA_COMPLETE,
blk_status_to_errno(bio->bi_status));
}
static void blk_add_trace_bio_backmerge(void *ignore,