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Commit da69da18 authored by Gui Jianfeng's avatar Gui Jianfeng Committed by Jens Axboe
Browse files

io-controller: Document for blkio.weight_device 



Here is the document for blkio.weight_device

Signed-off-by: default avatarGui Jianfeng <guijianfeng@cn.fujitsu.com>
Acked-by: default avatarVivek Goyal <vgoyal@redhat.com>
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent 34d0f179

Documentation/cgroups/blkio-controller.txt

+30 −1
Original line number Diff line number Diff line
@@ -76,9 +76,38 @@ 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.weight_device).

	  Currently allowed range of weights is from 100 to 1000.



- 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 > /path/to/cgroup/blkio.weight_device

	  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



- blkio.time

	- disk time allocated to cgroup per device in milliseconds. First

	  two fields specify the major and minor number of the device and