Function sched_interact_fork

freebsd/kern/sched_ule.c:1668–1682

* Scale back the interactivity history when a child thread is created. The * history is inherited from the parent but the thread may behave totally * differently. For example, a shell spawning a compiler process. We want * to learn that the compiler is behaving badly very quickly. */

 * to learn that the compiler is behaving badly very quickly.
 */
static void
sched_interact_fork(struct thread *td)
{
	struct td_sched *ts;
	int ratio;
	int sum;

	ts = td_get_sched(td);
	sum = ts->ts_runtime + ts->ts_slptime;
	if (sum > SCHED_SLP_RUN_FORK) {
		ratio = sum / SCHED_SLP_RUN_FORK;
		ts->ts_runtime /= ratio;
		ts->ts_slptime /= ratio;
	}
}

/*
 * Called from proc0_init() to setup the scheduler fields.