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@@ -76,9 +76,38 @@ CONFIG_DEBUG_BLK_CGROUP
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Details of cgroup files
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=======================
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- blkio.weight
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- - Specifies per cgroup weight.
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+ - Specifies per cgroup weight. This is default weight of the group
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+ on all the devices until and unless overridden by per device rule.
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+ (See blkio.weight_device).
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Currently allowed range of weights is from 100 to 1000.
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+- blkio.weight_device
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+ - One can specify per cgroup per device rules using this interface.
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+ These rules override the default value of group weight as specified
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+ by blkio.weight.
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+
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+ Following is the format.
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+
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+ #echo dev_maj:dev_minor weight > /path/to/cgroup/blkio.weight_device
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+ Configure weight=300 on /dev/sdb (8:16) in this cgroup
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+ # echo 8:16 300 > blkio.weight_device
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+ # cat blkio.weight_device
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+ dev weight
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+ 8:16 300
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+
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+ Configure weight=500 on /dev/sda (8:0) in this cgroup
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+ # echo 8:0 500 > blkio.weight_device
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+ # cat blkio.weight_device
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+ dev weight
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+ 8:0 500
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+ 8:16 300
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+
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+ Remove specific weight for /dev/sda in this cgroup
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+ # echo 8:0 0 > blkio.weight_device
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+ # cat blkio.weight_device
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+ dev weight
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+ 8:16 300
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+
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- blkio.time
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- disk time allocated to cgroup per device in milliseconds. First
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two fields specify the major and minor number of the device and
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