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    SubjectRe: RSDL v0.31
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    On Thu, 2007-03-22 at 10:18 +0100, Ingo Molnar wrote:
    > * Mike Galbraith <efault@gmx.de> wrote:
    >
    > > Actually, the numbers are an interesting curiosity point, but not as
    > > interesting as the fact that the deadline mechanism isn't kicking in.
    >
    > it's not just the scheduling accounting being off, RSDL also seems to be
    > accessing stale data here:
    >
    > > >From pull_task():
    > > /*
    > > * If this task has already been running on src_rq this priority
    > > * cycle, make the new runqueue think it has been on its cycle
    > > */
    > > if (p->rotation == src_rq->prio_rotation)
    > > p->rotation = this_rq->prio_rotation;
    > >
    > > The intent here is clearly that this task continue on the new cpu as
    > > if nothing has happened. However, when the task was dequeued,
    > > p->array was left as it was, points to the last place it was queued.
    > > Stale data.
    >
    > it might point to a hot-unplugged CPU's runqueue as well. Which might
    > work accidentally, but we want this fixed nevertheless.

    Erk! I mentioned to Con offline that I've seen RSDL bring up only one
    of my two (halves of a) penguins a couple three times out of a zillion
    boots. Maybe that's why?

    -Mike

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