linux-kernel - 3.0: blk-cgroup.c: allow '*' for device selection for "throttle.read_bps

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Message-Id: <50A647C4020000A10000D7B1@gwsmtp1.uni-regensburg.de>
Date:	Fri, 16 Nov 2012 14:03:48 +0100
From:	"Ulrich Windl" <Ulrich.Windl@...uni-regensburg.de>
To:	<linux-kernel@...r.kernel.org>
Subject: 3.0: blk-cgroup.c: allow '*' for device selection for
 "throttle.read_bps_device" and alike

Hi!

I have a wish for Linux 3.x and blkio cgroup subsystem:
Allow to specify any device like: blkio.throttle.read_bps_device = "*:* 41943040"

Why: With multipathing being effective, you can't predict the device number your device will have in advance (I'm talking about "/etc/cgconfig.conf").

Example:
# multipath -ll |grep dm-
CBW_DB_FATA-E2 (3600508b4001085dd0001100003800000) dm-10 HP,HSV200
CBW_CI-E2 (3600508b4001085dd00011000040c0000) dm-12 HP,HSV200
CBW_DB_FATA-E1 (3600508b4001085e30000f00001810000) dm-18 HP,HSV200
CBW_CI-E1 (3600508b4001085e30000f00001f60000) dm-19 HP,HSV200
DP_FileLib-E2 (3600508b4001085dd0001100004be0000) dm-16 HP,HSV200
CBW_DB_Exe-E2 (3600508b4001085dd00011000037b0000) dm-11 HP,HSV200
CBW_DB_Exe-E1 (3600508b4001085e30000f000017e0000) dm-17 HP,HSV200
DP_DB_10k-E2 (3600508b4001085dd0001100004480000) dm-15 HP,HSV200
CBW_DB_BTD-E2 (3600508b4001085dd0001100005ad0000) dm-14 HP,HSV200
DP_DB_10k-E1 (3600508b4001085e30000f00002460000) dm-20 HP,HSV200
CBW_DB_10k-E2 (3600508b4001085dd0001100005a50000) dm-9 HP,HSV200
CBW_DB_10k-E1 (3600508b4001085e30000f000035f0000) dm-13 HP,HSV200

The code is in blkio_policy_parse_and_set() of blk-cgroup.c.

Regards,
Ulrich


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