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tick-sched: recalculate sleep length each time it is requested

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Recalculating the sleep length each time its called allows us to account
for the fact that the amount of time we can sleep for might change after
tick_nohz_stop_sched_tick is called in idle. The prime example of this
is an idle notifier that cancels timers as we are entering idle.

Change-Id: I92871efc7befb3fee2a816da16145ba9da334a9e
Signed-off-by: Jeff Ohlstein <johlstei@codeaurora.org>
(cherry picked from commit 9feb87d70208e2236d24ef0ac2fa4d0e28e7d335)
This commit is contained in:
Jeff Ohlstein 2012-07-17 16:45:19 -07:00 committed by Rohit Vaswani
parent b551c512c1
commit 1c0a4128e4
2 changed files with 2 additions and 5 deletions
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2
include/linux/tick.h
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@ -44,7 +44,6 @@ enum tick_nohz_mode {
* @idle_exittime: Time when the idle state was left
* @idle_sleeptime: Sum of the time slept in idle with sched tick stopped
* @iowait_sleeptime: Sum of the time slept in idle with sched tick stopped, with IO outstanding
* @sleep_length: Duration of the current idle sleep
* @do_timer_lst: CPU was the last one doing do_timer before going idle
*/
struct tick_sched {
@ -63,7 +62,6 @@ struct tick_sched {
ktime_t idle_exittime;
ktime_t idle_sleeptime;
ktime_t iowait_sleeptime;
ktime_t sleep_length;
unsigned long last_jiffies;
unsigned long next_jiffies;
ktime_t idle_expires;

5
kernel/time/tick-sched.c
View file

@ -447,7 +447,6 @@ static void tick_nohz_stop_sched_tick(struct tick_sched *ts)
out:
ts->next_jiffies = next_jiffies;
ts->last_jiffies = last_jiffies;
ts->sleep_length = ktime_sub(dev->next_event, now);
}
/**
@ -516,8 +515,8 @@ void tick_nohz_irq_exit(void)
ktime_t tick_nohz_get_sleep_length(void)
{
struct tick_sched *ts = &__get_cpu_var(tick_cpu_sched);
return ts->sleep_length;
struct clock_event_device *dev = __get_cpu_var(tick_cpu_device).evtdev;
return ktime_sub(dev->next_event, ts->idle_entrytime);
}
static void tick_nohz_restart(struct tick_sched *ts, ktime_t now)