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Add a tracepoint for block request remapping

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Since 2.6.31 now has request-based device-mapper, it's useful to have
a tracepoint for request-remapping as well as bio-remapping.
This patch adds a tracepoint for request-remapping, trace_block_rq_remap().

Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Cc: Alasdair G Kergon <agk@redhat.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jun'ichi Nomura 2009-10-01 21:16:13 +02:00 • committed by Jens Axboe
parent 67efc92580
commit b0da3f0dad
4 changed files with 69 additions and 1 deletions
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2
include/linux/blktrace_api.h
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@ -212,7 +212,7 @@ extern struct attribute_group blk_trace_attr_group;
# define blk_trace_startstop(q, start) (-ENOTTY)
# define blk_trace_remove(q) (-ENOTTY)
# define blk_add_trace_msg(q, fmt, ...) do { } while (0)
# define blk_trace_remove_sysfs(struct device *dev) do { } while (0)
# define blk_trace_remove_sysfs(dev) do { } while (0)
static inline int blk_trace_init_sysfs(struct device *dev)
{
return 0;