linux-kernel - Re: IO controller Mini-Summit 2009

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Date:	Thu, 15 Oct 2009 09:39:04 +0900
From:	Fernando Luis Vázquez Cao 
	<fernando@....ntt.co.jp>
To:	Vivek Goyal <vgoyal@...hat.com>
CC:	Ryo Tsuruta <ryov@...inux.co.jp>, linux-kernel@...r.kernel.org,
	dm-devel@...hat.com, containers@...ts.linux-foundation.org,
	virtualization@...ts.linux-foundation.org,
	xen-devel@...ts.xensource.com, Jens Axboe <jens.axboe@...cle.com>,
	Nauman Rafique <nauman@...gle.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Munehiro Ikeda <m-ikeda@...jp.nec.com>,
	Hirokazu Takahashi <taka@...inux.co.jp>,
	Li Zefan <lizf@...fujitsu.com>,
	Gui Jianfeng <guijianfeng@...fujitsu.com>,
	Takuya Yoshikawa <yoshikawa.takuya@....ntt.co.jp>,
	Dong-Jae Kang <baramsori72@...il.com>,
	Isaku Yamahata <yamahata@...inux.co.jp>,
	Akio Takebe <takebe_akio@...fujitsu.com>
Subject: Re: IO controller Mini-Summit 2009

Hi Vivek,

Thank you for CCing me.

I just wanted to let you know that Ted Tso was kind enough to let
us give a readout for the mini-summit at the kernel summit.

There will be other mini-summits sharing 50 minutes so we need to
keep each mini-summit readout to 5-6 minutes of presentation and
4-5 minutes of questions/discussions.

Yoshikawa-san and myself were planning to take notes of the
mini-summit, but it would be great if you could share yours.  The
idea is to use those to prepare a brief mini-summit report (4-5
slides) that we can show at the kernel summit.

Later in the day, after the mini-summit, we would be sending a
draft version of the slides to the relevant mailing lists for you
to review. Since the mini-summit readouts will take place on
Monday I would appreciate it if you could comment on them before
Sunday night the latest.

Thanks,

Fernando

Vivek Goyal wrote:
> On Wed, Oct 14, 2009 at 09:24:44PM +0900, Ryo Tsuruta wrote:
>> Hello,
>>
> 
> Hi Ryo,
> 
> CCing people who are planning to attend the mini summit either in person
> or phone. (As per your list on io mini summit wiki page). Not sure if
> everybody is scanning mailing list for update on mini summit.
> 
> I am checking out wiki page for more information like Venue. It says the
> venue is linux foundation office Japan. Hopefully there is no change in
> that information.
> 
> What are the conference call details for the people who might want to join
> in over phone? Could not find those. Are you yet to post these?
> 
> Thanks
> Vivek
> 
>> I have summarized the topics for the IO controller mini-summit and
>> written the ideas seen in the mailing list.
>>
>> - The place where IO controller should be implemented
>>   - Block layer in conjunction with the IO scheduler
>>   - Common layer right above the IO scheduler
>>   - CFQ enhancement.
>>   - Both block and common layer, users can select whichever controller
>>     they want.
>>   - VFS layer
>>
>> - What kind of bandwidth control policies are needed?
>>   - Proportional weight
>>   - Enforcing upper limit
>>   - Minimum bandwidth guarantee
>>
>> - How to handle buffered writes?
>>   - Add dirt-ratio in the memory controller
>>   - Add bufferred-write-cgroup to track buffered writebacks
>>   - A per group per bdi pdflush threads
>>
>> - Who should be charged for swap activity?
>>   - who requests a page.
>>   - who has a page.
>>   - All swap activities are charged to the root group.
>>
>> And I would also like to discuss about the followings.
>>
>> - Extensions of struct bio
>>   - Make a bio point to the io_context of a process which creates the
>>     I/O request. This allows to pass the IO scheduling class and
>>     priority information to IO controller even if the IO is submitted
>>     by another process which does not create the request, such as a
>>     worker thread.
>>   - Add a new flag to struct bio to identify the bio as urgent. This
>>     gives IO controller a chance to handle the bio as high
>>     priority. This flag should be set if the bio is created for the
>>     page-out operation. 
>>
>> - Common test methods to verify the functionality of IO controller.
>>
>> Please give me comments and suggestions. I may be missing or
>> misunderstanding something.
>>
>> Thanks,
>> Ryo Tsuruta
>> --
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