Linux 内核时钟之oneshot编程

/**
 * tick_program_event
 */
int tick_program_event(ktime_t expires, int force)
{
 struct clock_event_device *dev = __this_cpu_read(tick_cpu_device.evtdev);
 if (unlikely(expires.tv64 == KTIME_MAX)) {
  /*
   * We don't need the clock event device any more, stop it.
   */
  clockevents_switch_state(dev, CLOCK_EVT_STATE_ONESHOT_STOPPED);
  return 0;
 }
 if (unlikely(clockevent_state_oneshot_stopped(dev))) {
  /*
   * We need the clock event again, configure it in ONESHOT mode
   * before using it.
   */
  clockevents_switch_state(dev, CLOCK_EVT_STATE_ONESHOT);
 }
 return clockevents_program_event(dev, expires, force);
}
下面这些函数会对timer重新编程：

hrtimer_force_reprogram

hrtimer_interrupt

__tick_broadcast_oneshot_control

tick_nohz_restart

tick_nohz_stop_sched_tick

tick_nohz_handler

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