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    SubjectRe: IO controller discussion (Was: Re: [PATCH 01/10] Documentation)
    On Sun, 19 Apr 2009 17:53:59 +0200
    Andrea Righi <> wrote:
    > >
    > > Got a question for you. Does memory controller already have the per cgroup
    > > dirty pages limit? If no, has this been discussed in the past? if yes,
    > > what was the conclsion?

    IMHO, dirty page handling and I/O throttling is a different problem.

    - A task (or cgroup) which makes the page dirty
    - A task (or cgroup) to which a page is accounted

    Is different from each other, in general.

    I have a plan to add dirty_ratio to memcg, but it's for avoiding massive stavation in
    memory reclaim, not for I/O control.

    If you want to implement I/O throttle in MM layer, plz don't depend on memcg.
    The perpose is different.


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