[RFC PATCH v2 5/8] timers: keep sleep length updated as needed

Aubrey Li
2017-09-30T07:21:45Z

sleep length indicates how long we'll be idle. Currently, it's updated
only when tick nohz enters. These patch series make a new requirement
with tick, so we should keep sleep length updated as needed
---
kernel/time/tick-sched.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index d663fab..94fb9b8 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -1008,8 +1008,11 @@ void tick_nohz_irq_exit(void)
*/
ktime_t tick_nohz_get_sleep_length(void)
{
+ struct clock_event_device *dev = __this_cpu_read(tick_cpu_device.evtdev);
struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);

+ ts->sleep_length = ktime_sub(dev->next_event, ktime_get());
+
return ts->sleep_length;
}

--
2.7.4