linux-kernel - [ 13/21] drbd: add missing part_round_stats to _drbd_start_io

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Date:	Fri, 18 Jan 2013 17:19:31 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk,
	Philipp Reisner <philipp.reisner@...bit.com>,
	Lars Ellenberg <lars.ellenberg@...bit.com>,
	Raoul Bhatia <raoul@...tia.at>
Subject: [ 13/21] drbd: add missing part_round_stats to _drbd_start_io_acct

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Philipp Reisner <philipp.reisner@...bit.com>

commit 72585d2428fa3a0daab02ebad1f41e5ef517dbaa upstream.

Without this, iostat frequently sees bogus svctime and >= 100% "utilization".

Signed-off-by: Philipp Reisner <philipp.reisner@...bit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@...bit.com>
Cc: Raoul Bhatia <raoul@...tia.at>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/block/drbd/drbd_req.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -37,6 +37,7 @@ static void _drbd_start_io_acct(struct d
 	const int rw = bio_data_dir(bio);
 	int cpu;
 	cpu = part_stat_lock();
+	part_round_stats(cpu, &mdev->vdisk->part0);
 	part_stat_inc(cpu, &mdev->vdisk->part0, ios[rw]);
 	part_stat_add(cpu, &mdev->vdisk->part0, sectors[rw], bio_sectors(bio));
 	part_inc_in_flight(&mdev->vdisk->part0, rw);


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