Exemple #1
0
static void cpudl_heapify_up(struct cpudl *cp, int idx)
{
	int p;

	int orig_cpu = cp->elements[idx].cpu;
	u64 orig_dl = cp->elements[idx].dl;

	if (idx == 0)
		return;

	do {
		p = parent(idx);
		if (dl_time_before(orig_dl, cp->elements[p].dl))
			break;
		/* pull parent onto idx */
		cp->elements[idx].cpu = cp->elements[p].cpu;
		cp->elements[idx].dl = cp->elements[p].dl;
		cp->elements[cp->elements[idx].cpu].idx = idx;
		idx = p;
	} while (idx != 0);
	/* actual push up of saved original values orig_* */
	cp->elements[idx].cpu = orig_cpu;
	cp->elements[idx].dl = orig_dl;
	cp->elements[cp->elements[idx].cpu].idx = idx;
}
static void cpudl_change_key(struct cpudl *cp, int idx, u64 new_dl)
{
	WARN_ON(idx == IDX_INVALID || !cpu_present(idx));

	if (dl_time_before(new_dl, cp->elements[idx].dl)) {
		cp->elements[idx].dl = new_dl;
		cpudl_heapify(cp, idx);
	} else {
		cp->elements[idx].dl = new_dl;
		while (idx > 0 && dl_time_before(cp->elements[parent(idx)].dl,
					cp->elements[idx].dl)) {
			cpudl_exchange(cp, idx, parent(idx));
			idx = parent(idx);
		}
	}
}
Exemple #3
0
static void cpudl_heapify(struct cpudl *cp, int idx)
{
	if (idx > 0 && dl_time_before(cp->elements[parent(idx)].dl,
				cp->elements[idx].dl))
		cpudl_heapify_up(cp, idx);
	else
		cpudl_heapify_down(cp, idx);
}
Exemple #4
0
static void cpudl_heapify_down(struct cpudl *cp, int idx)
{
	int l, r, largest;

	int orig_cpu = cp->elements[idx].cpu;
	u64 orig_dl = cp->elements[idx].dl;

	if (left_child(idx) >= cp->size)
		return;

	/* adapted from lib/prio_heap.c */
	while(1) {
		u64 largest_dl;
		l = left_child(idx);
		r = right_child(idx);
		largest = idx;
		largest_dl = orig_dl;

		if ((l < cp->size) && dl_time_before(orig_dl,
						cp->elements[l].dl)) {
			largest = l;
			largest_dl = cp->elements[l].dl;
		}
		if ((r < cp->size) && dl_time_before(largest_dl,
						cp->elements[r].dl))
			largest = r;

		if (largest == idx)
			break;

		/* pull largest child onto idx */
		cp->elements[idx].cpu = cp->elements[largest].cpu;
		cp->elements[idx].dl = cp->elements[largest].dl;
		cp->elements[cp->elements[idx].cpu].idx = idx;
		idx = largest;
	}
	/* actual push down of saved original values orig_* */
	cp->elements[idx].cpu = orig_cpu;
	cp->elements[idx].dl = orig_dl;
	cp->elements[cp->elements[idx].cpu].idx = idx;
}
Exemple #5
0
void dline_insert()
{
    dline_t deadline = ask_deadline();
    int p = heap_get_max_proc(&myheap);
    if (dl_time_before(heap_get_max_dline(&myheap), deadline))
        printf("Too large!\n");
    else {
        heap_preempt(&myheap, p, deadline);
        heap_print(&myheap);
        if (!heap_check(&myheap)) exit(-1);
    }
}
/*
 * cpudl_set - update the cpudl max-heap
 * @cp: the cpudl max-heap context
 * @cpu: the target cpu
 * @dl: the new earliest deadline for this cpu
 *
 * Notes: assumes cpu_rq(cpu)->lock is locked
 *
 * Returns: (void)
 */
void cpudl_set(struct cpudl *cp, int cpu, u64 dl, int is_valid)
{
	int old_idx, new_cpu;
	unsigned long flags;

	WARN_ON(!cpu_present(cpu));

	raw_spin_lock_irqsave(&cp->lock, flags);
	old_idx = cp->cpu_to_idx[cpu];
	if (!is_valid) {
		/* remove item */
		if (old_idx == IDX_INVALID) {
			/*
			 * Nothing to remove if old_idx was invalid.
			 * This could happen if a rq_offline_dl is
			 * called for a CPU without -dl tasks running.
			 */
			goto out;
		}
		new_cpu = cp->elements[cp->size - 1].cpu;
		cp->elements[old_idx].dl = cp->elements[cp->size - 1].dl;
		cp->elements[old_idx].cpu = new_cpu;
		cp->size--;
		cp->cpu_to_idx[new_cpu] = old_idx;
		cp->cpu_to_idx[cpu] = IDX_INVALID;
		while (old_idx > 0 && dl_time_before(
				cp->elements[parent(old_idx)].dl,
				cp->elements[old_idx].dl)) {
			cpudl_exchange(cp, old_idx, parent(old_idx));
			old_idx = parent(old_idx);
		}
		cpumask_set_cpu(cpu, cp->free_cpus);
                cpudl_heapify(cp, old_idx);

		goto out;
	}

	if (old_idx == IDX_INVALID) {
		cp->size++;
		cp->elements[cp->size - 1].dl = 0;
		cp->elements[cp->size - 1].cpu = cpu;
		cp->cpu_to_idx[cpu] = cp->size - 1;
		cpudl_change_key(cp, cp->size - 1, dl);
		cpumask_clear_cpu(cpu, cp->free_cpus);
	} else {
		cpudl_change_key(cp, old_idx, dl);
	}

out:
	raw_spin_unlock_irqrestore(&cp->lock, flags);
}
static void cpudl_heapify(struct cpudl *cp, int idx)
{
	int l, r, largest;

	/* adapted from lib/prio_heap.c */
	while(1) {
		l = left_child(idx);
		r = right_child(idx);
		largest = idx;

		if ((l < cp->size) && dl_time_before(cp->elements[idx].dl,
							cp->elements[l].dl))
			largest = l;
		if ((r < cp->size) && dl_time_before(cp->elements[largest].dl,
							cp->elements[r].dl))
			largest = r;
		if (largest == idx)
			break;

		/* Push idx down the heap one level and bump one up */
		cpudl_exchange(cp, largest, idx);
		idx = largest;
	}
}
Exemple #8
0
void dline_update()
{
    printf("Select a processor (0-7): ");
    int proc;
    scanf("%d", &proc);
    if (proc >7 || proc <0) 
        printf("Wrong processor!\n");
    else {
        dline_t deadline = ask_deadline();

        if (dl_time_before(deadline, myheap.nodes[proc].deadline)) 
            printf("deadline too short\n");
        else {
            heap_finish(&myheap, proc, deadline);
            heap_print(&myheap);
            if (!heap_check(&myheap)) exit(-1);
        }
    }
}
/*
 * cpudl_find - find the best (later-dl) CPU in the system
 * @cp: the cpudl max-heap context
 * @p: the task
 * @later_mask: a mask to fill in with the selected CPUs (or NULL)
 *
 * Returns: int - best CPU (heap maximum if suitable)
 */
int cpudl_find(struct cpudl *cp, struct task_struct *p,
	       struct cpumask *later_mask)
{
	int best_cpu = -1;
	const struct sched_dl_entity *dl_se = &p->dl;

	if (later_mask && cpumask_and(later_mask, later_mask, cp->free_cpus)) {
		best_cpu = cpumask_any(later_mask);
		goto out;
	} else if (cpumask_test_cpu(cpudl_maximum(cp), &p->cpus_allowed) &&
			dl_time_before(dl_se->deadline, cp->elements[0].dl)) {
		best_cpu = cpudl_maximum(cp);
		if (later_mask)
			cpumask_set_cpu(best_cpu, later_mask);
	}

out:
	WARN_ON(best_cpu != -1 && !cpu_present(best_cpu));

	return best_cpu;
}