From: Zhaoyang Huang <zhaoyang.hu...@spreadtrum.com> There should be a gap between tick_nohz_idle_enter and tick_nohz_get_sleep_length when idle, which will cause the sleep_length is not very precised. Change it in this patch.
Signed-off-by: Zhaoyang Huang <zhaoyang.hu...@spreadtrum.com> --- kernel/time/tick-sched.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 536ada8..ee3be3d 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -975,6 +975,11 @@ void tick_nohz_irq_exit(void) ktime_t tick_nohz_get_sleep_length(void) { struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched); + struct clock_event_device *dev = __this_cpu_read(tick_cpu_device.evtdev); + ktime_t now; + + now = ktime_get(); + ts->sleep_length = ktime_sub(dev->next_event, now); return ts->sleep_length; } -- 1.7.9.5