linux-kernel - [PATCH 3.2.y] drbd: add missing part_round_stats to _drbd_start_io

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Date:	Fri, 18 Jan 2013 20:12:43 +0100
From:	Raoul Bhatia <raoul@...tia.at>
To:	<stable@...r.kernel.org>
Cc:	<linux-kernel@...r.kernel.org>, <ben@...adent.org.uk>
Subject: [PATCH 3.2.y] drbd: add missing part_round_stats to _drbd_start_io_acct

commit 72585d2428fa3a0daab02ebad1f41e5ef517dbaa upstream

Please include upstream patch 72585d2428fa3a0daab02ebad1f41e5ef517dbaa 
into 3.2.y.
Patch from git below.

Please also see the discussion at
http://lists.linbit.com/pipermail/drbd-user/2012-January/017622.html

and the upstream patches at
https://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=72585d2428fa3a0daab02ebad1f41e5ef517dbaa
http://git.drbd.org/gitweb.cgi?p=drbd-8.3.git;a=commitdiff;h=80cb2183911626747d3f7546fe3cb3c1abe6ba41

Thanks,
Raoul

 From 72585d2428fa3a0daab02ebad1f41e5ef517dbaa Mon Sep 17 00:00:00 2001
 From: Philipp Reisner <philipp.reisner@...bit.com>
Date: Thu, 23 Feb 2012 12:56:26 +0100
Subject: [PATCH] drbd: add missing part_round_stats to 
_drbd_start_io_acct

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>
---
  drivers/block/drbd/drbd_req.c |    1 +
  1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/block/drbd/drbd_req.c 
b/drivers/block/drbd/drbd_req.c
index 4737ad1..bfd14bc 100644
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -39,6 +39,7 @@ static void _drbd_start_io_acct(struct drbd_conf 
*mdev, struct drbd_request *req
  	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));
  	(void) cpu; /* The macro invocations above want the cpu argument, I 
do not like
-- 
1.7.6.5

-- 
DI (FH) Raoul Bhatia M.Sc.     |   E-Mail.  raoul@...tia.at
Software Development and       |   Web.     http://www.ipax.at
System Administration          |   Tel.     +43 699 10132530
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