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[PATCH] device-mapper disk statistics: timing

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Record I/O timing statistics

The start time is added to struct dm_io, an existing structure allocated
privately internally within dm and attached to each incoming bio.

We export disk_round_stats() from block/ll_rw_blk.c instead of creating a
private clone.

Signed-off-by: Jun'ichi "Nick" Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jun'ichi "Nick" Nomura
2006-02-01 03:04:53 -08:00
committed by Linus Torvalds
parent 12f03a49cf
commit 3eaf840e0b
2 changed files with 35 additions and 2 deletions
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block/ll_rw_blk.c
+2
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@@ -2579,6 +2579,8 @@ void disk_round_stats(struct gendisk *disk)
disk->stamp = now;
}
EXPORT_SYMBOL_GPL(disk_round_stats);
/*
* queue lock must be held
*/