Add support for blkio.weight_device

Signed-off-by: Ma Shimiao <mashimiao.fnst@cn.fujitsu.com>

contrib/completion/bash/docker

@@ -1355,6 +1355,7 @@ _docker_run() {
 		--add-host
 		--attach -a
 		--blkio-weight
+		--blkio-weight-device
 		--cap-add
 		--cap-drop
 		--cgroup-parent

contrib/completion/zsh/_docker

@@ -418,6 +418,7 @@ __docker_subcommand() {
         "($help -a --attach)"{-a=,--attach=}"[Attach to stdin, stdout or stderr]:device:(STDIN STDOUT STDERR)"
         "($help)*--add-host=[Add a custom host-to-IP mapping]:host\:ip mapping: "
         "($help)--blkio-weight=[Block IO (relative weight), between 10 and 1000]:Block IO weight:(10 100 500 1000)"
+        "($help)--blkio-weight-device=-[Block IO (relative device weight)]:device:Block IO weight: "
         "($help)*--cap-add=[Add Linux capabilities]:capability: "
         "($help)*--cap-drop=[Drop Linux capabilities]:capability: "
         "($help)--cidfile=[Write the container ID to the file]:CID file:_files"

docs/reference/commandline/create.md

@@ -19,6 +19,7 @@ Creates a new container.
       -a, --attach=[]               Attach to STDIN, STDOUT or STDERR
       --add-host=[]                 Add a custom host-to-IP mapping (host:ip)
       --blkio-weight=0              Block IO weight (relative weight)
+      --blkio-weight-device=""      Block IO weight (relative device weight, format: `DEVICE_NAME:WEIGHT`)
       --cpu-shares=0                CPU shares (relative weight)
       --cap-add=[]                  Add Linux capabilities
       --cap-drop=[]                 Drop Linux capabilities

docs/reference/commandline/run.md

@@ -17,6 +17,7 @@ parent = "smn_cli"
       -a, --attach=[]               Attach to STDIN, STDOUT or STDERR
       --add-host=[]                 Add a custom host-to-IP mapping (host:ip)
       --blkio-weight=0              Block IO weight (relative weight)
+      --blkio-weight-device=""      Block IO weight (relative device weight, format: `DEVICE_NAME:WEIGHT`)
       --cpu-shares=0                CPU shares (relative weight)
       --cap-add=[]                  Add Linux capabilities
       --cap-drop=[]                 Drop Linux capabilities

docs/reference/run.md

@@ -623,6 +623,7 @@ container:
 | `--cpuset-mems=""`         | Memory nodes (MEMs) in which to allow execution (0-3, 0,1). Only effective on NUMA systems. |
 | `--cpu-quota=0`            | Limit the CPU CFS (Completely Fair Scheduler) quota                                         |
 | `--blkio-weight=0`         | Block IO weight (relative weight) accepts a weight value between 10 and 1000.               |
+| `--blkio-weight-device=""` | Block IO weight (relative device weight, format: `DEVICE_NAME:WEIGHT`)                                                |
 | `--oom-kill-disable=false` | Whether to disable OOM Killer for the container or not.                                     |
 | `--memory-swappiness=""  ` | Tune a container's memory swappiness behavior. Accepts an integer between 0 and 100.        |
 
@@ -937,6 +938,9 @@ By default, all containers get the same proportion of block IO bandwidth
 container's blkio weight relative to the weighting of all other running
 containers using the `--blkio-weight` flag.
 
+> **Note:** The blkio weight setting is only available for direct IO. Buffered IO
+> is not currently supported.
+
 The `--blkio-weight` flag can set the weighting to a value between 10 to 1000.
 For example, the commands below create two containers with different blkio
 weight:
@@ -951,8 +955,24 @@ If you do block IO in the two containers at the same time, by, for example:
 You'll find that the proportion of time is the same as the proportion of blkio
 weights of the two containers.
 
-> **Note:** The blkio weight setting is only available for direct IO. Buffered IO
+The `--blkio-weight-device="DEVICE_NAME:WEIGHT"` flag sets a specific device weight.
-> is not currently supported.
+The `DEVICE_NAME:WEIGHT` is a string containing a colon-separated device name and weight.
+For example, to set `/dev/sda` device weight to `200`:
+
+$ docker run -it \
+    --blkio-weight-device "/dev/sda:200" \
+    ubuntu
+
+If you specify both the `--blkio-weight` and `--blkio-weight-device`, Docker
+uses the `--blkio-weight` as the default weight and uses `--blkio-weight-device` 
+to override this default with a new value on a specific device. 
+The following example uses a default weight of `300` and overrides this default 
+on `/dev/sda` setting that weight to `200`:
+
+$ docker run -it \
+    --blkio-weight 300 \
+    --blkio-weight-device "/dev/sda:200" \
+    ubuntu
 
 ## Additional groups
     --group-add: Add Linux capabilities

man/docker-create.1.md

@@ -9,6 +9,7 @@ docker-create - Create a new container
 [**-a**|**--attach**[=*[]*]]
 [**--add-host**[=*[]*]]
 [**--blkio-weight**[=*[BLKIO-WEIGHT]*]]
+[**--blkio-weight-device**[=*[]*]]
 [**--cpu-shares**[=*0*]]
 [**--cap-add**[=*[]*]]
 [**--cap-drop**[=*[]*]]
@@ -82,6 +83,9 @@ The initial status of the container created with **docker create** is 'created'.
 **--blkio-weight**=*0*
    Block IO weight (relative weight) accepts a weight value between 10 and 1000.
 
+**--blkio-weight-device**=[]
+   Block IO weight (relative device weight, format: `DEVICE_NAME:WEIGHT`).
+
 **--cpu-shares**=*0*
    CPU shares (relative weight)
 

man/docker-run.1.md

@@ -9,6 +9,7 @@ docker-run - Run a command in a new container
 [**-a**|**--attach**[=*[]*]]
 [**--add-host**[=*[]*]]
 [**--blkio-weight**[=*[BLKIO-WEIGHT]*]]
+[**--blkio-weight-device**[=*[]*]]
 [**--cpu-shares**[=*0*]]
 [**--cap-add**[=*[]*]]
 [**--cap-drop**[=*[]*]]
@@ -99,6 +100,9 @@ option can be set multiple times.
 **--blkio-weight**=*0*
    Block IO weight (relative weight) accepts a weight value between 10 and 1000.
 
+**--blkio-weight-device**=[]
+   Block IO weight (relative device weight, format: `DEVICE_NAME:WEIGHT`).
+
 **--cpu-shares**=*0*
    CPU shares (relative weight)
 
@@ -755,6 +759,13 @@ Note:
 
 You would have to write policy defining a `svirt_apache_t` type.
 
+## Setting device weight
+
+If you want to set `/dev/sda` device weight to `200`, you can specify the device
+weight by `--blkio-weight-device` flag. Use the following command:
+
+   # docker run -it --blkio-weight-device "/dev/sda:200" ubuntu
+
 # HISTORY
 April 2014, Originally compiled by William Henry (whenry at redhat dot com)
 based on docker.com source material and internal work.