C++ (Cpp) row_get_next_queue Examples

Example #1

File: row-iosched.c Project: duki994/G900H_LP_Kernel

/*
 * row_dispatch_requests() - selects the next request to dispatch
 * @q:		requests queue
 * @force:		flag indicating if forced dispatch
 *
 * Return 0 if no requests were moved to the dispatch queue.
 *	  1 otherwise
 *
 */
static int row_dispatch_requests(struct request_queue *q, int force)
{
	struct row_data *rd = (struct row_data *)q->elevator->elevator_data;
	int ret = 0, currq, ioprio_class_to_serve, start_idx, end_idx;

	if (force && hrtimer_active(&rd->rd_idle_data.hr_timer)) {
		if (hrtimer_try_to_cancel(&rd->rd_idle_data.hr_timer) >= 0) {
			row_log(rd->dispatch_queue,
				"Canceled delayed work on %d - forced dispatch",
				rd->rd_idle_data.idling_queue_idx);
			rd->rd_idle_data.idling_queue_idx = ROWQ_MAX_PRIO;
		}
	}

	if (rd->pending_urgent_rq) {
		row_log(rd->dispatch_queue, "dispatching urgent request");
		row_dispatch_insert(rd, rd->pending_urgent_rq);
		ret = 1;
		goto done;
	}

	ioprio_class_to_serve = row_get_ioprio_class_to_serve(rd, force);
	row_log(rd->dispatch_queue, "Dispatching from %d priority class",
		ioprio_class_to_serve);

	switch (ioprio_class_to_serve) {
	case IOPRIO_CLASS_NONE:
		rd->last_served_ioprio_class = IOPRIO_CLASS_NONE;
		goto done;
	case IOPRIO_CLASS_RT:
		start_idx = ROWQ_HIGH_PRIO_IDX;
		end_idx = ROWQ_REG_PRIO_IDX;
		break;
	case IOPRIO_CLASS_BE:
		start_idx = ROWQ_REG_PRIO_IDX;
		end_idx = ROWQ_LOW_PRIO_IDX;
		break;
	case IOPRIO_CLASS_IDLE:
		start_idx = ROWQ_LOW_PRIO_IDX;
		end_idx = ROWQ_MAX_PRIO;
		break;
	default:
		pr_err("%s(): Invalid I/O priority class", __func__);
		goto done;
	}

	currq = row_get_next_queue(q, rd, start_idx, end_idx);

	/* Dispatch */
	if (currq >= 0) {
		row_dispatch_insert(rd,
			rq_entry_fifo(rd->row_queues[currq].fifo.next));
		ret = 1;
	}
done:
	return ret;
}

Example #2

File: row-iosched.c Project: rondikc/Dhollmen_Kernel

/*
 * row_choose_queue() -  choose the next queue to dispatch from
 * @rd:	pointer to struct row_data
 *
 * Updates rd->curr_queue. Returns 1 if there are requests to
 * dispatch, 0 if there are no requests in scheduler
 *
 */
static int row_choose_queue(struct row_data *rd)
{
    int prev_curr_queue = rd->curr_queue;

    if (!(rd->nr_reqs[0] + rd->nr_reqs[1]))
        return 0;

    row_get_next_queue(rd);

    /*
     * Loop over all queues to find the next queue that is not empty.
     * Stop when you get back to curr_queue
     */
    while (list_empty(&rd->row_queues[rd->curr_queue].rqueue.fifo)
            && rd->curr_queue != prev_curr_queue) {
        /* Mark rqueue as unserved */
        row_mark_rowq_unserved(rd, rd->curr_queue);
        row_get_next_queue(rd);
    }

    return 1;
}