linux-kernel - Re: [PATCH 2/2 V3] io-controller: Document for blkio.weight

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Message-ID: <20100305141333.GB3296@redhat.com>
Date:	Fri, 5 Mar 2010 09:13:33 -0500
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Gui Jianfeng <guijianfeng@...fujitsu.com>
Cc:	jens.axboe@...cle.com, Chad Talbott <ctalbott@...gle.com>,
	linux-kernel@...r.kernel.org, Nauman Rafique <nauman@...gle.com>,
	Li Zefan <lizf@...fujitsu.com>
Subject: Re: [PATCH 2/2 V3] io-controller: Document for blkio.weight_device

On Fri, Mar 05, 2010 at 10:26:39AM +0800, Gui Jianfeng wrote:
> Here is the document for blkio.weight_device
> 
> Signed-off-by: Gui Jianfeng <guijianfeng@...fujitsu.com>

Looks good to me.

Acked-by: Vivek Goyal <vgoyal@...hat.com>

Vivek

> ---
>  Documentation/cgroups/blkio-controller.txt |   35 +++++++++++++++++++++++++++-
>  1 files changed, 34 insertions(+), 1 deletions(-)
> 
> diff --git a/Documentation/cgroups/blkio-controller.txt b/Documentation/cgroups/blkio-controller.txt
> index 630879c..e551c85 100644
> --- a/Documentation/cgroups/blkio-controller.txt
> +++ b/Documentation/cgroups/blkio-controller.txt
> @@ -76,7 +76,9 @@ 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.
>  
> @@ -99,6 +101,37 @@ Details of cgroup files
>  	  and minor number of the device and third field specifies the number
>  	  of times a group was dequeued from a particular device.
>  
> +- 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
> +
> +	  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
> -- 
> 1.5.4.rc3
> 
> 
> 
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