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Subject[PATCH] sched/deadline: Zero out positive runtime after throttling constrained tasks
Date
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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