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    SubjectRe: [patch] Real-Time Preemption, -RT-2.6.12-rc6-V0.7.48-00

    * Michal Schmidt <xschmi00@stud.feec.vutbr.cz> wrote:

    > Hi Ingo,
    >
    > Since the introduction of the delayed preemption feature in V0.7.47-20
    > my KDE desktop has been jerky. The sound from artsd often skips. The
    > mouse pointer jumps when I compile anything the background and try to
    > browse the web with Firefox.

    yeah.

    > I think that try_to_wake_up is broken for the !sync case. We have:
    >
    > __activate_task(p, rq);
    > if (TASK_PREEMPTS_CURR(p, rq)) {
    > if (sync)
    > set_tsk_need_resched_delayed(rq->curr);
    > else
    > resched_task(rq->curr);
    > }
    >
    > Shouldn't we call the full activate_task(...) instead of
    > __activate_task(...) in the !sync case?

    indeed.

    > The attached patch fixes seems to fix it for me. It is against
    > V0.7.48-05.

    thanks, applied - but this does not end all of the reschedule problems
    that the latest patches have. More on that later.

    Ingo
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