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NOHZ: split tick_nohz_restart_sched_tick()

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Split out the clock event device reprogramming. Preparatory
patch.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2008-10-17 10:04:34 +02:00 committed by Thomas Gleixner
parent 719254faa1
commit c34bec5a44
1 changed files with 27 additions and 22 deletions
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49
kernel/time/tick-sched.c
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@ -377,6 +377,32 @@ ktime_t tick_nohz_get_sleep_length(void)
return ts->sleep_length; return ts->sleep_length;
} }
static void tick_nohz_restart(struct tick_sched *ts, ktime_t now)
{
hrtimer_cancel(&ts->sched_timer);
ts->sched_timer.expires = ts->idle_tick;
while (1) {
/* Forward the time to expire in the future */
hrtimer_forward(&ts->sched_timer, now, tick_period);
if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {
hrtimer_start(&ts->sched_timer,
ts->sched_timer.expires,
HRTIMER_MODE_ABS);
/* Check, if the timer was already in the past */
if (hrtimer_active(&ts->sched_timer))
break;
} else {
if (!tick_program_event(ts->sched_timer.expires, 0))
break;
}
/* Update jiffies and reread time */
tick_do_update_jiffies64(now);
now = ktime_get();
}
}
/** /**
* tick_nohz_restart_sched_tick - restart the idle tick from the idle task * tick_nohz_restart_sched_tick - restart the idle tick from the idle task
* *
@ -430,28 +456,7 @@ void tick_nohz_restart_sched_tick(void)
*/ */
ts->tick_stopped = 0; ts->tick_stopped = 0;
ts->idle_exittime = now; ts->idle_exittime = now;
hrtimer_cancel(&ts->sched_timer); tick_nohz_restart(ts, now);
ts->sched_timer.expires = ts->idle_tick;
while (1) {
/* Forward the time to expire in the future */
hrtimer_forward(&ts->sched_timer, now, tick_period);
if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {
hrtimer_start(&ts->sched_timer,
ts->sched_timer.expires,
HRTIMER_MODE_ABS);
/* Check, if the timer was already in the past */
if (hrtimer_active(&ts->sched_timer))
break;
} else {
if (!tick_program_event(ts->sched_timer.expires, 0))
break;
}
/* Update jiffies and reread time */
tick_do_update_jiffies64(now);
now = ktime_get();
}
local_irq_enable(); local_irq_enable();
} }