tick-sched.c (2bbb6817c0ac1b5f2a68d720f364f98eeb1ac4fd) tick-sched.c (1268fbc746ea1cd279886a740dcbad4ba5232225)
1/*
2 * linux/kernel/time/tick-sched.c
3 *
4 * Copyright(C) 2005-2006, Thomas Gleixner <tglx@linutronix.de>
5 * Copyright(C) 2005-2007, Red Hat, Inc., Ingo Molnar
6 * Copyright(C) 2006-2007 Timesys Corp., Thomas Gleixner
7 *
8 * No idle tick implementation for low and high resolution timers

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449}
450
451/**
452 * tick_nohz_idle_enter - stop the idle tick from the idle task
453 *
454 * When the next event is more than a tick into the future, stop the idle tick
455 * Called when we start the idle loop.
456 *
1/*
2 * linux/kernel/time/tick-sched.c
3 *
4 * Copyright(C) 2005-2006, Thomas Gleixner <tglx@linutronix.de>
5 * Copyright(C) 2005-2007, Red Hat, Inc., Ingo Molnar
6 * Copyright(C) 2006-2007 Timesys Corp., Thomas Gleixner
7 *
8 * No idle tick implementation for low and high resolution timers

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449}
450
451/**
452 * tick_nohz_idle_enter - stop the idle tick from the idle task
453 *
454 * When the next event is more than a tick into the future, stop the idle tick
455 * Called when we start the idle loop.
456 *
457 * If no use of RCU is made in the idle loop between
458 * tick_nohz_idle_enter() and tick_nohz_idle_exit() calls, then
459 * tick_nohz_idle_enter_norcu() should be called instead and the arch
460 * doesn't need to call rcu_idle_enter() and rcu_idle_exit() explicitly.
457 * The arch is responsible of calling:
461 *
458 *
462 * Otherwise the arch is responsible of calling:
463 *
464 * - rcu_idle_enter() after its last use of RCU before the CPU is put
465 * to sleep.
466 * - rcu_idle_exit() before the first use of RCU after the CPU is woken up.
467 */
459 * - rcu_idle_enter() after its last use of RCU before the CPU is put
460 * to sleep.
461 * - rcu_idle_exit() before the first use of RCU after the CPU is woken up.
462 */
468void __tick_nohz_idle_enter(void)
463void tick_nohz_idle_enter(void)
469{
470 struct tick_sched *ts;
471
464{
465 struct tick_sched *ts;
466
467 WARN_ON_ONCE(irqs_disabled());
468
469 local_irq_disable();
470
472 ts = &__get_cpu_var(tick_cpu_sched);
473 /*
474 * set ts->inidle unconditionally. even if the system did not
475 * switch to nohz mode the cpu frequency governers rely on the
476 * update of the idle time accounting in tick_nohz_start_idle().
477 */
478 ts->inidle = 1;
479 tick_nohz_stop_sched_tick(ts);
471 ts = &__get_cpu_var(tick_cpu_sched);
472 /*
473 * set ts->inidle unconditionally. even if the system did not
474 * switch to nohz mode the cpu frequency governers rely on the
475 * update of the idle time accounting in tick_nohz_start_idle().
476 */
477 ts->inidle = 1;
478 tick_nohz_stop_sched_tick(ts);
479
480 local_irq_enable();
480}
481
482/**
483 * tick_nohz_irq_exit - update next tick event from interrupt exit
484 *
485 * When an interrupt fires while we are idle and it doesn't cause
486 * a reschedule, it may still add, modify or delete a timer, enqueue
487 * an RCU callback, etc...

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482
483/**
484 * tick_nohz_irq_exit - update next tick event from interrupt exit
485 *
486 * When an interrupt fires while we are idle and it doesn't cause
487 * a reschedule, it may still add, modify or delete a timer, enqueue
488 * an RCU callback, etc...

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