[RFC PATCH v2 2/2] power/idle: enhance the precision of sleep_length
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From: <hidden>
Date: 2016-06-09 07:36:02
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Subsystem:
nohz, dynticks support, the rest · Maintainers:
Anna-Maria Behnsen, Frederic Weisbecker, Ingo Molnar, Thomas Gleixner, Linus Torvalds
From: Zhaoyang Huang <redacted> 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 <redacted> --- 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; }
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1.7.9.5