Messages in this thread Patch in this message | | | Date | Wed, 4 Feb 2015 06:35:52 -0800 | From | tip-bot for Wanpeng Li <> | Subject | [tip:sched/core] sched: Fix hrtick_start() on UP |
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Commit-ID: 868933359a3bdda25b562e9d41bce7071edc1b08 Gitweb: http://git.kernel.org/tip/868933359a3bdda25b562e9d41bce7071edc1b08 Author: Wanpeng Li <wanpeng.li@linux.intel.com> AuthorDate: Wed, 26 Nov 2014 08:44:06 +0800 Committer: Ingo Molnar <mingo@kernel.org> CommitDate: Wed, 4 Feb 2015 07:52:28 +0100
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 <wanpeng.li@linux.intel.com> Fixes: 177ef2a6315e ("sched/deadline: Fix a precision problem in the microseconds range") [ Fixed the changelog. ] Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Juri Lelli <juri.lelli@arm.com> Cc: Kirill Tkhai <ktkhai@parallels.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/1416962647-76792-7-git-send-email-wanpeng.li@linux.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org> --- kernel/sched/core.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index d59652d..5091fd4 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); }
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