Messages in this thread Patch in this message | | | From | Jacob Pan <> | Subject | [PATCH 2/4] timer: relax tick stop in idle entry | Date | Fri, 13 Nov 2015 11:53:05 -0800 |
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Upon entering idle, we can turn off tick if the next timeout is exactly one tick away. Otherwise, we could enter inner idle loop with tick still enabled, without resched set, the tick will continue during idle therefore less optimal in terms of energy savings.
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com> --- kernel/time/tick-sched.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 7c7ec45..bcadaab 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -606,7 +606,7 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts, * restart it proper. */ delta = next_tick - basemono; - if (delta <= (u64)TICK_NSEC) { + if (delta < (u64)TICK_NSEC) { tick.tv64 = 0; if (!ts->tick_stopped) goto out; -- 1.9.1
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