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Subject[PATCH] trace bio queueing trial only when it occurs

It got lost in LKML mail storm.
I resend this.
Wu, Could you review this patch, please?

== CUT_HERE ==

If BIO is discarded or cross over end of device,
BIO queueing trial doesn't occur.

Let's trace it only when it happens.

Signed-off-by: Minchan Kim <minchan.kim@gmail.com>
---
block/blk-core.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index 5b59592..1a0cfd5 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1463,8 +1463,6 @@ static inline void __generic_make_request(struct bio *bio)
if (old_sector != -1)
trace_block_remap(q, bio, old_dev, old_sector);

- trace_block_bio_queue(q, bio);
-
old_sector = bio->bi_sector;
old_dev = bio->bi_bdev->bd_dev;

@@ -1477,6 +1475,8 @@ static inline void __generic_make_request(struct bio *bio)
goto end_io;
}

+ trace_block_bio_queue(q, bio);
+
ret = q->make_request_fn(q, bio);
} while (ret);

--
1.6.4


--
Kind regards,
Minchan Kim


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