[RFC] IO Controller

Takuya Yoshikawa yoshikawa.takuya at oss.ntt.co.jp
Wed Mar 11 20:27:07 PDT 2009

Hi Vivek,

Could you tell me to which kernel I can apply your patches?
   # latest mm?
I would like to test your controller.

Thank you,
   Takuya Yoshikawa

Vivek Goyal wrote:
> Hi All,
> Here is another posting for IO controller patches. Last time I had posted
> RFC patches for an IO controller which did bio control per cgroup.
> http://lkml.org/lkml/2008/11/6/227
> One of the takeaway from the discussion in this thread was that let us
> implement a common layer which contains the proportional weight scheduling
> code which can be shared by all the IO schedulers.
> Implementing IO controller will not cover the devices which don't use
> IO schedulers but it should cover the common case.
> There were more discussions regarding 2 level vs 1 level IO control at
> following link.
> https://lists.linux-foundation.org/pipermail/containers/2009-January/015402.html
> So in the mean time we took the discussion off the list and spent time on
> making the 1 level control apporoach work where majority of the proportional
> weight control is shared by the four schedulers instead of each one having
> to replicate the code. We make use of BFQ code for fair queuing as posted
> by Paolo and Fabio here.
> http://lkml.org/lkml/2008/11/11/148
> Details about design and howto have been put in documentation patch.
> I have done very basic testing of running 2 or 3 "dd" threads in different
> cgroups. Wanted to get the patchset out for feedback/review before we dive
> into more bug fixing, benchmarking, optimizations etc.
> Your feedback/comments are welcome.
> Patch series contains 10 patches. It should be compilable and bootable after
> every patch. Intial 2 patches implement flat fair queuing (no cgroup
> support) and make cfq to use that. Later patches introduce hierarchical
> fair queuing support in elevator layer and modify other IO schdulers to use
> that.
> Thanks
> Vivek
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