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    SubjectRe: [Question]How to restrict some kind of task?
    Date
    On Tue, 15 Nov 2005 21:18, liyu wrote:
    > Hi, All.
    >
    > I want to restrict some kind of task.
    >
    > For example, for some task have one schedule policy SCHED_XYZ, when
    > it reach beyond
    > 40% CPU time, we force it yield CPU.
    >
    > I inserted some code in scheduler_tick(), like this:
    > > if (check_task_overload(rq)) {
    > > if (xyz_task(p) && yield_cpu(p, rq)) {
    > > set_tsk_need_resched(p);
    > > p->prio = effective_prio(p);
    > > p->time_slice = task_timeslice(p);
    > > p->first_time_slice = 0;
    > > goto out_unlock;
    > > }
    > > }
    >
    > Of course, before these code, we hold our rq->lock first, so we should
    > go to 'out_unlock'.
    > The function xyz_task(p) just is macro (p->policy == SCHED_XYZ), and
    > yield_cpu() also is simple, it just move the task to expired array,
    >
    > int yield_cpu(task_t *p, runqueue_t *rq)
    > {
    > dequeue_task(p, p->array);
    > requeue_task(p, rq->expired);
    > return 1;
    > }

    Don't requeue after dequeue. You enqueue after dequeue.

    Con
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