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authorWanpeng Li <wanpeng.li@linux.intel.com>2014-11-26 08:44:06 +0800
committerIngo Molnar <mingo@kernel.org>2015-02-04 07:52:28 +0100
commit868933359a3bdda25b562e9d41bce7071edc1b08 (patch)
treeaf8aafb7fce81a7ea1681bd3c41eddcd927fc89c /kernel
parent75381608e8410a72ae8b4080849dc86b472c01fb (diff)
downloadlinux-868933359a3bdda25b562e9d41bce7071edc1b08.tar.bz2
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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched/core.c5
1 files changed, 5 insertions, 0 deletions
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);
}