AcoSail/kernel_optimize_test
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[PATCH] device-mapper statistics: basic

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Record basic I/O statistics for mapped devices.

Signed-off-by: Kevin Corry <kevcorry@us.ibm.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>
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Kevin Corry 2006-02-01 03:04:52 -08:00 committed by Linus Torvalds
parent dab6a42915
commit 12f03a49cf
1 changed files with 4 additions and 0 deletions
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4
drivers/md/dm.c
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@ -573,10 +573,14 @@ static void __split_bio(struct mapped_device *md, struct bio *bio)
static int dm_request(request_queue_t *q, struct bio *bio)
{
int r;
int rw = bio_data_dir(bio);
struct mapped_device *md = q->queuedata;
down_read(&md->io_lock);
disk_stat_inc(dm_disk(md), ios[rw]);
disk_stat_add(dm_disk(md), sectors[rw], bio_sectors(bio));
/*
* If we're suspended we have to queue
* this io for later.