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authorThomas Gleixner <tglx@linutronix.de>2008-10-17 10:04:34 +0200
committerThomas Gleixner <tglx@apollo.(none)>2008-10-17 18:13:38 +0200
commitc34bec5a44e9486597d78e7a686b2f9088a0564c (patch)
treedd538560814ea54ce8d3f46b935dd24127fba04e /kernel/time/tick-sched.c
parent719254faa17ffedc87ba0fadb9b34e535c9758d5 (diff)
downloadlwn-c34bec5a44e9486597d78e7a686b2f9088a0564c.tar.gz
lwn-c34bec5a44e9486597d78e7a686b2f9088a0564c.zip
NOHZ: split tick_nohz_restart_sched_tick()
Split out the clock event device reprogramming. Preparatory patch. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/time/tick-sched.c')
-rw-r--r--kernel/time/tick-sched.c49
1 files changed, 27 insertions, 22 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index fdcf3f93bb8d..7aedf4343539 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -377,6 +377,32 @@ ktime_t tick_nohz_get_sleep_length(void)
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
*
@@ -430,28 +456,7 @@ void tick_nohz_restart_sched_tick(void)
*/
ts->tick_stopped = 0;
ts->idle_exittime = 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(ts, now);
local_irq_enable();
}