calc_load_tasks

//4.14.2
//sched/loadavg.c 

/*
 * Called from scheduler_tick() to periodically update this CPU‘s
 * active count.
 */
void calc_global_load_tick(struct rq *this_rq)
{
    long delta;

    if (time_before(jiffies, this_rq->calc_load_update))
        return;

    delta  = calc_load_fold_active(this_rq, 0);
    if (delta)
        atomic_long_add(delta, &calc_load_tasks);

    this_rq->calc_load_update += LOAD_FREQ;
}


long calc_load_fold_active(struct rq *this_rq, long adjust)
{
    long nr_active, delta = 0;

    nr_active = this_rq->nr_running - adjust;
    nr_active += (long)this_rq->nr_uninterruptible;

    if (nr_active != this_rq->calc_load_active) {
        delta = nr_active - this_rq->calc_load_active;
        this_rq->calc_load_active = nr_active;
    }

    return delta;
}