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| author | Gui Jianfeng <guijianfeng@cn.fujitsu.com> | 2010-04-13 16:07:50 +0800 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2010-04-13 10:14:20 +0200 |
| commit | da69da184c06f365b335a0e013dc6360a82abe85 (patch) | |
| tree | 940e4d1706b3b5c1c56e3fc7db63e1f1efb5c50f | |
| parent | 34d0f179d6dd711d3fc13c0820a456c59aae8048 (diff) | |
io-controller: Document for blkio.weight_device
Here is the document for blkio.weight_device
Signed-off-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
| -rw-r--r-- | Documentation/cgroups/blkio-controller.txt | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/Documentation/cgroups/blkio-controller.txt b/Documentation/cgroups/blkio-controller.txt index db054ea3e7f..d422b410a99 100644 --- a/Documentation/cgroups/blkio-controller.txt +++ b/Documentation/cgroups/blkio-controller.txt @@ -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 |