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[dm-devel] Re: IO controller Mini-Summit 2009



Hi all,

I'm planning to use the skype group chat for the IO mini-summit.
Although I haven't used it ever, but If it works well, I think it
would be helpful for the discussion. I'll post my skype account on
the IO mini-summit web soon.
https://sourceforge.net/apps/trac/ioband/wiki/iosummit

Thanks,
Ryo Tsuruta

Ryo Tsuruta <ryov valinux co jp> wrote:
> Hi Vivek,
> 
> Vivek Goyal <vgoyal redhat com> wrote:
> > 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.
> 
> Thank you for CCing people. I'll add all prospective attendees to Cc
> list when I post the information 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.
> 
> There is no change in the venue.
>  
> > 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?
> 
> Here is the phone number of the conference call.
> number +1-218-936-7999
> passcode 374489#
> 
> I've also added the phone number on the web site.
> http://sourceforge.net/apps/trac/ioband/wiki/iosummit
> 
> Thank you for your help.
> Ryo Tsuruta
> 
> > 
> > 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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