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    SubjectRe: [PATCH 0/3] sched: use EDF to throttle RT task groups v2

    > > The biggest problem with the four files used in the current implementation
    > > is that bandwidth assignments should be atomic (because setting all the
    > > parameters independently can force the system to go through non-feasible
    > > assignments, and the order to use when assigning runtime and period
    > > changes depending on the direction of the change). I know this is a
    > > dangerous question, but I'll try it anyway: are we ready for multi-valued
    > > cgroup parameters?
    >
    > Right, I don't know about multi-valued files, that sounds like its going
    > to confuse people too.
    >

    True, but after having used the current interface I feel multi-valued
    files will be better. For an idea, this is how I currently change
    bandwidth allocated to a group.

    (I am ignoring cpu.rt_ prefixes and _us suffixes for the filenames)

    Starting state: task_runtime: 100000, task_period: 1000000.
    runtime=200000, period=1000000

    Suppose I want to bring down the periods to 100000, then first I need
    to change task_runtime to 10000, then the task period, then the runtime
    and finally the period.

    If I want to go the opposite way, then first I need to increase the
    periods and then the runtimes.

    But I can also see why one would not want a multi-valued interface, esp
    when the idea is just to change the runtimes. (though there is a
    complicated interaction between task_runtime and runtime which I am not
    sure how to avoid).

    IOW, this interface sucks :-). We really need something better and
    easier to use. (Sorry for no constructive input)

    Thanks,
    Dhaval


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