Esempio n. 1
0
/*
 * The body of the idle task.
 */
void cpu_idle(void)
{
	if (ppc_md.idle_loop)
		ppc_md.idle_loop();	/* doesn't return */

	set_thread_flag(TIF_POLLING_NRFLAG);
	while (1) {
		tick_nohz_idle_enter();
		rcu_idle_enter();

		while (!need_resched() && !cpu_should_die()) {
			ppc64_runlatch_off();

			if (ppc_md.power_save) {
				clear_thread_flag(TIF_POLLING_NRFLAG);
				/*
				 * smp_mb is so clearing of TIF_POLLING_NRFLAG
				 * is ordered w.r.t. need_resched() test.
				 */
				smp_mb();
				local_irq_disable();

				/* Don't trace irqs off for idle */
				stop_critical_timings();

				/* check again after disabling irqs */
				if (!need_resched() && !cpu_should_die())
					ppc_md.power_save();

				start_critical_timings();

				/* Some power_save functions return with
				 * interrupts enabled, some don't.
				 */
				if (irqs_disabled())
					local_irq_enable();
				set_thread_flag(TIF_POLLING_NRFLAG);

			} else {
				/*
				 * Go into low thread priority and possibly
				 * low power mode.
				 */
				HMT_low();
				HMT_very_low();
			}
		}

		HMT_medium();
		ppc64_runlatch_on();
		rcu_idle_exit();
		tick_nohz_idle_exit();
		if (cpu_should_die()) {
			sched_preempt_enable_no_resched();
			cpu_die();
		}
		schedule_preempt_disabled();
	}
}
Esempio n. 2
0
/*
 * The body of the idle task.
 */
void cpu_idle(void)
{
	if (ppc_md.idle_loop)
		ppc_md.idle_loop();	/* doesn't return */

	set_thread_flag(TIF_POLLING_NRFLAG);
	while (1) {
		hrtimer_stop_sched_tick();

		while (!need_resched() && !need_resched_delayed() &&
				!cpu_should_die()) {
			ppc64_runlatch_off();
			/*
			 *
			 * We have irqs disabled here, so stop latency tracing
			 * at this point and restart it after we return:
			 */
			stop_critical_timing();

			if (ppc_md.power_save) {
				clear_thread_flag(TIF_POLLING_NRFLAG);
				/*
				 * smp_mb is so clearing of TIF_POLLING_NRFLAG
				 * is ordered w.r.t. need_resched() test.
				 */
				smp_mb();
				local_irq_disable();

				/* check again after disabling irqs */
				if (!need_resched() && !cpu_should_die())
					ppc_md.power_save();

				local_irq_enable();
				set_thread_flag(TIF_POLLING_NRFLAG);

			} else {
				/*
				 * Go into low thread priority and possibly
				 * low power mode.
				 */
				HMT_low();
				HMT_very_low();
			}

			touch_critical_timing();
		}

		HMT_medium();
		ppc64_runlatch_on();
		if (cpu_should_die())
			cpu_die();

		hrtimer_restart_sched_tick();
		__preempt_enable_no_resched();
		schedule();
		preempt_disable();
	}
}
Esempio n. 3
0
void cpu_idle(void)
{
	if (ppc_md.idle_loop)
		ppc_md.idle_loop();	

	set_thread_flag(TIF_POLLING_NRFLAG);
	while (1) {
		tick_nohz_idle_enter();
		rcu_idle_enter();

		while (!need_resched() && !cpu_should_die()) {
			ppc64_runlatch_off();

			if (ppc_md.power_save) {
				clear_thread_flag(TIF_POLLING_NRFLAG);
				smp_mb();
				local_irq_disable();

				
				stop_critical_timings();

				
				if (!need_resched() && !cpu_should_die())
					ppc_md.power_save();

				start_critical_timings();

				if (irqs_disabled())
					local_irq_enable();
				set_thread_flag(TIF_POLLING_NRFLAG);

			} else {
				HMT_low();
				HMT_very_low();
			}
		}

		HMT_medium();
		ppc64_runlatch_on();
		rcu_idle_exit();
		tick_nohz_idle_exit();
		if (cpu_should_die()) {
			sched_preempt_enable_no_resched();
			cpu_die();
		}
		schedule_preempt_disabled();
	}
}
Esempio n. 4
0
File: idle.c Progetto: 274914765/C
/*
 * The body of the idle task.
 */
void cpu_idle(void)
{
    if (ppc_md.idle_loop)
        ppc_md.idle_loop();    /* doesn't return */

    set_thread_flag(TIF_POLLING_NRFLAG);
    while (1) {
        tick_nohz_stop_sched_tick();
        while (!need_resched() && !cpu_should_die()) {
            ppc64_runlatch_off();

            if (ppc_md.power_save) {
                clear_thread_flag(TIF_POLLING_NRFLAG);
                /*
                 * smp_mb is so clearing of TIF_POLLING_NRFLAG
                 * is ordered w.r.t. need_resched() test.
                 */
                smp_mb();
                local_irq_disable();

                /* check again after disabling irqs */
                if (!need_resched() && !cpu_should_die())
                    ppc_md.power_save();

                local_irq_enable();
                set_thread_flag(TIF_POLLING_NRFLAG);

            } else {
                /*
                 * Go into low thread priority and possibly
                 * low power mode.
                 */
                HMT_low();
                HMT_very_low();
            }
        }

        HMT_medium();
        ppc64_runlatch_on();
        tick_nohz_restart_sched_tick();
        if (cpu_should_die())
            cpu_die();
        preempt_enable_no_resched();
        schedule();
        preempt_disable();
    }
}