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From: Gui Jianfeng on 3 Mar 2010 01:30
Here is the document for blkio.policy.

Signed-off-by: Gui Jianfeng <guijianfeng(a)cn.fujitsu.com>
---
Documentation/cgroups/blkio-controller.txt | 35 +++++++++++++++++++++++++++-
1 files changed, 34 insertions(+), 1 deletions(-)

diff --git a/Documentation/cgroups/blkio-controller.txt b/Documentation/cgroups/blkio-controller.txt
index 630879c..f29f206 100644
--- a/Documentation/cgroups/blkio-controller.txt
+++ b/Documentation/cgroups/blkio-controller.txt
@@ -76,7 +76,9 @@ CONFIG_DEBUG_BLK_CGROUP
Details of cgroup files
=======================
- blkio.weight
- - Specifies per cgroup weight.
+ - Specifies per cgroup weight. This is default weight of the group
+ on all the devices until and unless overridden by per device rule.
+ (See blkio.policy).

Currently allowed range of weights is from 100 to 1000.

@@ -99,6 +101,37 @@ Details of cgroup files
and minor number of the device and third field specifies the number
of times a group was dequeued from a particular device.

+- blkio.policy
+ - One can specify per cgroup per device rules using this interface.
+ These rules override the default value of group weight as specified
+ by blkio.weight.
+
+ Following is the format.
+
+ #echo dev_maj:dev_minor weight > /patch/to/cgroup/blkio.policy
+
+ weight=0 means removing a policy.
+
+ Examples:
+ Configure weight=300 on /dev/sdb (8:16) in this cgroup
+ # echo 8:16 300 > blkio.policy
+ # cat blkio.policy
+ dev weight
+ 8:16 300
+
+ Configure weight=500 on /dev/sda (8:0) in this cgroup
+ # echo 8:0 500 > blkio.policy
+ # cat blkio.policy
+ dev weight
+ 8:0 500
+ 8:16 300
+
+ Remove the policy for /dev/sda in this cgroup
+ # echo 8:0 0 > blkio.policy
+ # cat blkio.policy
+ dev weight
+ 8:16 300
+
CFQ sysfs tunable
=================
/sys/block/<disk>/queue/iosched/group_isolation
--
1.5.4.rc3




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Prev: linux 2.6.32 and 2.6.26 nat with pppoe throughput is very different.
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