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

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Date:	Fri, 05 Mar 2010 11:44:22 +0900
From:	Takuya Yoshikawa <yoshikawa.takuya@....ntt.co.jp>
To:	Gui Jianfeng <guijianfeng@...fujitsu.com>
CC:	Vivek Goyal <vgoyal@...hat.com>, 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

Hi, thank you for fixing ...

Gui Jianfeng wrote:
> +- 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

You deleted wrong character!  We need 't' not 'c'.

Thanks,
   Takuya

> +
> +	  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

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