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    SubjectRe: [PATCH] sched: remove starvation in check_preempt_equal_prio()
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    On Tue, May 24, 2011 at 9:47 PM, Peter Zijlstra <peterz@infradead.org> wrote:
    > On Tue, 2011-05-24 at 21:34 +0800, Hillf Danton wrote:
    >> If there are pushable tasks and they are high enough in priority, in which
    >> case task p is covered, the current could keep holding its CPU.
    >
    > -ENOPARSE..
    >

    Here the priority is same, then pushing task p off has little difference from
    pushing any other pushable.

    >> Even if current task has to release its CPU, requeuing task p could result in
    >> starvation of tasks that are of same priority and have been waiting on RQ for
    >> a couple of hours:/
    >
    > Starvation of the same priority tasks is a perfectly valid situation for
    > SCHED_FIFO, also, your changelog fails to mention what you propose to do
    > about it.
    >
    I did get curr requeued, and task_woken_rt() could do what I want.

    If you change ENOPARSE to PARSE, I will change task_woken_rt accordingly.

    thanks
    Hillf


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