Messages in this thread | | | From | Con Kolivas <> | Subject | Re: [Question]How to restrict some kind of task? | Date | Tue, 15 Nov 2005 21:21:29 +1100 |
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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.
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