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    SubjectRe: scheduler bug - threads not being scheduled for long periods
    On Mon, 2009-01-05 at 11:56 -0600, Dimitri Sivanich wrote:
    > One place we've found this happens is in update_curr(), which calculates a
    > delta_exec value as follows:
    > delta_exec = (unsigned long)(now - curr->exec_start);
    > Sometimes this value will be very large, as 'now' (the rq clock time) will
    > be less than 'exec_start'. When this happens, __update_curr() will
    > calculate a delta_exec_weighted based on this large value and add it to the
    > thread's vruntime:
    > curr->vruntime += delta_exec_weighted;

    So you're saying your rq->clock = sched_clock_cpu(cpu) = sched_clock()
    [on ia64] goes backwards?

    If so, then that's an architecture bug, sched_clock() must never be seen
    to go backwards!

     \ /
      Last update: 2009-01-05 21:59    [W:0.022 / U:8.260 seconds]
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