linux-kernel - Re: [PATCH 0/4] io-controller: Add new interfaces to trace backlogged group status

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Message-ID: <4BF9D265.70008@cn.fujitsu.com>
Date:	Mon, 24 May 2010 09:12:05 +0800
From:	Gui Jianfeng <guijianfeng@...fujitsu.com>
To:	Vivek Goyal <vgoyal@...hat.com>
CC:	Jens Axboe <jens.axboe@...cle.com>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/4] io-controller: Add new interfaces to trace	backlogged
 group status

Vivek Goyal wrote:
> On Fri, May 21, 2010 at 04:40:50PM +0800, Gui Jianfeng wrote:
>> Hi,
>>
>> This series implements three new interfaces to keep track of tranferred bytes,
>> elapsing time and io rate since group getting backlogged. If the group dequeues
>> from service tree, these three interfaces will reset and shows zero.
> 
> Hi Gui,
> 
> Can you give some details regarding how this functionality is useful? Why
> would somebody be interested in only in stats of till group was
> backlogged and not in total stats?
> 
> Groups can come and go so fast and these stats will reset so many times
> that I am not able to visualize how these stats will be useful.

Hi Vivek,

Currently, we assign weight to a group, but user still doesn't know how fast the
group runs. With io rate interface, users can check the rate of a group at any
moment, or to determine whether the weight assigned to a group is enough.
bytes and time interface is just for debug purpose.

Thanks,
Gui

> 
> Thanks
> Vivek
> 
>> Thanks
>> Gui
> 
> 
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