From: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Date: Sat, 21 Sep 2013 19:57:47 +0000 (-0600)
Subject: block: Add nr_bios to block_rq_remap tracepoint
X-Git-Tag: v3.12-rc2~4^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=75afb352991ff1cd3cf5955bfe611de6d83a0c87;p=pandora-kernel.git

block: Add nr_bios to block_rq_remap tracepoint

Adding the number of bios in a remapped request to 'block_rq_remap'
tracepoint.

Request remapper clones bios in a request to track the completion
status of each bio. So the number of bios can be useful information
for investigation.

Related discussions:
  http://www.redhat.com/archives/dm-devel/2013-August/msg00084.html
  http://www.redhat.com/archives/dm-devel/2013-September/msg00024.html

Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Acked-by: Mike Snitzer <snitzer@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

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