[Devel] Re: [RFC][PATCH -mm 0/5] cgroup: block device i/o controller (v9)

[Hirokazu Takahashi]

Hi,

> TODO:
> 
> * Try to push down the throttling and implement it directly in the I/O
>   schedulers, using bio-cgroup (http://people.valinux.co.jp/~ryov/bio-cgroup/)
>   to keep track of the right cgroup context. This approach could lead to more
>   memory consumption and increases the number of dirty pages (hard/slow to
>   reclaim pages) in the system, since dirty-page ratio in memory is not
>   limited. This could even lead to potential OOM conditions, but these problems
>   can be resolved directly into the memory cgroup subsystem
> 
> * Handle I/O generated by kswapd: at the moment there's no control on the I/O
>   generated by kswapd; try to use the page_cgroup functionality of the memory
>   cgroup controller to track this kind of I/O and charge the right cgroup when
>   pages are swapped in/out

FYI, this also can be done with bio-cgroup, which determine the owner cgroup
of a given anonymous page.

Thanks,
Hirokazu Takahashi
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