Eric Lee / linux-smarc-t335x-v3.2

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Commit 12f03a49cf0ab5e8511911142d28699499a572c4

Authored by Kevin Corry
Committed by Linus Torvalds
1 parent dab6a42915
Exists in master and in 4 other branches v3.2_AM335xPSP_04.06.00.11, v3.2_NEWT335xPSP_04.06.00.11, v3.2_SBC_SMARTMEN, v3.2_SMARCT335xPSP_04.06.00.11

[PATCH] device-mapper statistics: basic 

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>

Showing 1 changed file with 4 additions and 0 deletions Side-by-side Diff

... ... @@ -573,9 +573,13 @@
573 573 static int dm_request(request_queue_t *q, struct bio *bio)
574 574 {
575 575 int r;
  576 + int rw = bio_data_dir(bio);
576 577 struct mapped_device *md = q->queuedata;
577 578  
578 579 down_read(&md->io_lock);
  580 +
  581 + disk_stat_inc(dm_disk(md), ios[rw]);
  582 + disk_stat_add(dm_disk(md), sectors[rw], bio_sectors(bio));
579 583  
580 584 /*
581 585 * If we're suspended we have to queue