Messages in this thread Patch in this message | | | From | Xunlei Pang <> | Subject | [PATCH] sched/deadline: Zero out positive runtime after throttling constrained tasks | Date | Wed, 10 May 2017 21:03:37 +0800 |
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When a contrained task is throttled by dl_check_constrained_dl(), it may carry the remaining positive runtime, as a result when dl_task_timer() fires and calls replenish_dl_entity(), it will not be replenished correctly due to the positive dl_se->runtime.
This patch assigns its runtime to 0 if positive after throttling.
Fixes: df8eac8cafce ("sched/deadline: Throttle a constrained deadline task activated after the deadline) Cc: Daniel Bristot de Oliveira <bristot@redhat.com> Signed-off-by: Xunlei Pang <xlpang@redhat.com> --- kernel/sched/deadline.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index a2ce590..d3d291e 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -723,6 +723,8 @@ static inline void dl_check_constrained_dl(struct sched_dl_entity *dl_se) if (unlikely(dl_se->dl_boosted || !start_dl_timer(p))) return; dl_se->dl_throttled = 1; + if (dl_se->runtime > 0) + dl_se->runtime = 0; } } -- 1.8.3.1
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