From: Juri Lelli <[email protected]>
commit 5bfd126e80dca70431aef8fdbc1cf14535f3c338 upstream
sched/deadline: Fix sched_yield() behavior
yield_task_dl() is broken:
o it forces current to be throttled setting its runtime to zero;
o it sets current's dl_se->dl_new to one, expecting that dl_task_timer()
will queue it back with proper parameters at replenish time.
Unfortunately, dl_task_timer() has this check at the very beginning:
if (!dl_task(p) || dl_se->dl_new)
goto unlock;
So, it just bails out and the task is never replenished. It actually
yielded forever.
To fix this, introduce a new flag indicating that the task properly yielded
the CPU before its current runtime expired. While this is a little overdoing
at the moment, the flag would be useful in the future to discriminate between
"good" jobs (of which remaining runtime could be reclaimed, i.e. recycled)
and "bad" jobs (for which dl_throttled task has been set) that needed to be
stopped.
Reported-by: yjay.kim <[email protected]>
Signed-off-by: Juri Lelli <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Jianchuan Wang <[email protected]>
---
include/linux/sched.h | 7 +++++--
kernel/sched/core.c | 1 +
kernel/sched/deadline.c | 5 +++--
3 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index ccd0c6f..9399a02 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1141,9 +1141,12 @@ struct sched_dl_entity {
*
* @dl_boosted tells if we are boosted due to DI. If so we are
* outside bandwidth enforcement mechanism (but only until we
- * exit the critical section).
+ * exit the critical section);
+ *
+ * @dl_yielded tells if task gave up the cpu before consuming
+ * all its available runtime during the last job.
*/
- int dl_throttled, dl_new, dl_boosted;
+ int dl_throttled, dl_new, dl_boosted, dl_yielded;
/*
* Bandwidth enforcement timer. Each -deadline task has its
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index f5c6635..fd402c8 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3187,6 +3187,7 @@ __setparam_dl(struct task_struct *p, const struct
sched_attr *attr)
dl_se->dl_bw = to_ratio(dl_se->dl_period, dl_se->dl_runtime);
dl_se->dl_throttled = 0;
dl_se->dl_new = 1;
+ dl_se->dl_yielded = 0;
}
/* Actually do priority change: must hold pi & rq lock. */
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 6e79b3f..47a799a 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -505,6 +505,7 @@ static enum hrtimer_restart dl_task_timer(struct hrtimer
*timer)
sched_clock_tick();
update_rq_clock(rq);
dl_se->dl_throttled = 0;
+ dl_se->dl_yielded = 0;
if (p->on_rq) {
enqueue_task_dl(rq, p, ENQUEUE_REPLENISH);
if (task_has_dl_policy(rq->curr))
@@ -870,10 +871,10 @@ static void yield_task_dl(struct rq *rq)
* We make the task go to sleep until its current deadline by
* forcing its runtime to zero. This way, update_curr_dl() stops
* it and the bandwidth timer will wake it up and will give it
- * new scheduling parameters (thanks to dl_new=1).
+ * new scheduling parameters (thanks to dl_yielded=1).
*/
if (p->dl.runtime > 0) {
- rq->curr->dl.dl_new = 1;
+ rq->curr->dl.dl_yielded = 1;
p->dl.runtime = 0;
}
update_curr_dl(rq);
--
1.9.1
--
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