[lkml]   [2011]   [May]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [PATCH] sched: remove starvation in check_preempt_equal_prio()
    On Tue, May 24, 2011 at 9:47 PM, Peter Zijlstra <> 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.


     \ /
      Last update: 2011-05-24 16:03    [W:0.019 / U:2.452 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site