From 868933359a3bdda25b562e9d41bce7071edc1b08 Mon Sep 17 00:00:00 2001 From: Wanpeng Li Date: Wed, 26 Nov 2014 08:44:06 +0800 Subject: sched: Fix hrtick_start() on UP The commit 177ef2a6315e ("sched/deadline: Fix a precision problem in the microseconds range") forgot to change the UP version of hrtick_start(), do so now. Signed-off-by: Wanpeng Li Fixes: 177ef2a6315e ("sched/deadline: Fix a precision problem in the microseconds range") [ Fixed the changelog. ] Signed-off-by: Peter Zijlstra (Intel) Cc: Juri Lelli Cc: Kirill Tkhai Cc: Linus Torvalds Link: http://lkml.kernel.org/r/1416962647-76792-7-git-send-email-wanpeng.li@linux.intel.com Signed-off-by: Ingo Molnar --- kernel/sched/core.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'kernel/sched/core.c') diff --git a/kernel/sched/core.c b/kernel/sched/core.c index d59652d60f86..5091fd4feed8 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -492,6 +492,11 @@ static __init void init_hrtick(void) */ void hrtick_start(struct rq *rq, u64 delay) { + /* + * Don't schedule slices shorter than 10000ns, that just + * doesn't make sense. Rely on vruntime for fairness. + */ + delay = max_t(u64, delay, 10000LL); __hrtimer_start_range_ns(&rq->hrtick_timer, ns_to_ktime(delay), 0, HRTIMER_MODE_REL_PINNED, 0); } -- cgit v1.2.3-58-ga151