linux-kernel - Re: [PATCH 4/4] io-controller: Document for active bytes, time and rate.

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Date:	Wed, 26 May 2010 11:57:32 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Gui Jianfeng <guijianfeng@...fujitsu.com>
Cc:	Vivek Goyal <vgoyal@...hat.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] io-controller: Document for active bytes, time and
 rate.

On Fri, 21 May 2010 16:46:59 +0800 Gui Jianfeng wrote:

> Document for active bytes time and rate.
> 
> Signed-off-by: Gui Jianfeng <guijianfeng@...fujitsu.com>
> ---
>  Documentation/cgroups/blkio-controller.txt |   21 +++++++++++++++++++++
>  1 files changed, 21 insertions(+), 0 deletions(-)
> 
> diff --git a/Documentation/cgroups/blkio-controller.txt b/Documentation/cgroups/blkio-controller.txt
> index 48e0b21..2b015e8 100644
> --- a/Documentation/cgroups/blkio-controller.txt
> +++ b/Documentation/cgroups/blkio-controller.txt
> @@ -168,6 +168,27 @@ Details of cgroup files
>  	  cgroup. This is further divided by the type of operation - read or
>  	  write, sync or async.
>  
> +- blkio.io_active_bytes
> +	- Total number bytes transferred to/from the disk by the group since

	  Total number of bytes

> +	  the group got backlogged. First two fields specify the major and
> +	  minor number of the device, the third field specifies the operation
> +	  type and the fourth field specifies the number of bytes. It will be
> +	  reset when group gets dequeued from service tree.
> +
> +- blkio.io_active_time
> +	- Total amount of time(in ms) spent since the group got backlogged.

	                  time (in ms)

> +	  First two fields specify the major and minor number of the device,
> +	  third field specify how long it spents since the group got

	              specifies how long it spent

> +	  backlogged. It will be reset when group gets enqueued onto service
> +	  tree.
> +
> +- blkio.io_active_rate
> +	- The io rate (in bytes/ms) of the group when group is issuing io.

s/io/IO/ in multiple places (or s:io:I/O: if you prefer the '/')

> +	  First two fields specify the major and minor number of the device,
> +	  the third field specifies the operation type and the fourth field
> +	  specifies the io rate. If there isn't any io on the group, io rate
> +	  won't be computed.


---
~Randy
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