Re: [PATCH 2/2 V3] io-controller: Document for blkio.weight_device

From: Takuya Yoshikawa
Date: Thu Mar 04 2010 - 21:42:05 EST


Hi, thank you for fixing ...

Gui Jianfeng wrote:
+- blkio.weight_device
+ - 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 > /pach/to/cgroup/blkio.weight_device

You deleted wrong character! We need 't' not 'c'.

Thanks,
Takuya

+
+ weight=0 means removing weight on a given device.
+
+ Examples:
+ Configure weight=300 on /dev/sdb (8:16) in this cgroup
+ # echo 8:16 300 > blkio.weight_device
+ # cat blkio.weight_device
+ dev weight
+ 8:16 300
+
+ Configure weight=500 on /dev/sda (8:0) in this cgroup
+ # echo 8:0 500 > blkio.weight_device
+ # cat blkio.weight_device
+ dev weight
+ 8:0 500
+ 8:16 300
+
+ Remove specific weight for /dev/sda in this cgroup
+ # echo 8:0 0 > blkio.weight_device
+ # cat blkio.weight_device
+ dev weight
+ 8:16 300
+
CFQ sysfs tunable
=================
/sys/block/<disk>/queue/iosched/group_isolation

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