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Subject[PATCH v2] sched/deadline: overrun could happen in start_hrtick_dl
Date
It could be wrong for the precision of runtime and deadline
when the precision is within microsecond level. For example:
Task runtime deadline period
P1 200us 500us 500us

This case need enbale HRTICK feature by the next command
PC#echo "HRTICK" > /sys/kernel/debug/sched_features
PC#trace-cmd record -e sched_switch &
PC#./schedtool -E -t 200000:500000 -e ./test

Some of runtime and deadline run with millisecond level by
reading kernershark. Some pieces of trace.dat are as follows:
(remove some irrelevant information)
<idle>-0 157.603157: sched_switch: :R ==> 2481:4294967295: test
test-2481 157.603203: sched_switch: 2481:R ==> 0:120: swapper/2
<idle>-0 157.605657: sched_switch: :R ==> 2481:4294967295: test
test-2481 157.608183: sched_switch: 2481:R ==> 2483:120: trace-cmd
trace-cmd-2483 157.609656: sched_switch:2483:R==>2481:4294967295: test

We can get the runtime from the information at some point.
runtime = 157.605657 - 157.608183
runtime = 0.002526(2.526ms)
The correct runtime should be less than or equal to 200us at some point.

The problem is caused by a conditional judgment "delta > 10000".
Because no hrtimer start up to control the runtime when runtime is less than 10us.
So the process will continue to run until tick-period coming.

Move the code with the limit of the least time slice
from hrtick_start_fair() to hrtick_start() because
EDF schedule class also need this function in start_hrtick_dl().

To fix this problem, we call hrtimer_start() unconditionally in start_hrtick_dl(),
and make sure schedule slice won't be smaller than 10us in hrtimer_start().

Signed-off-by: Xiaofeng Yan <xiaofeng.yan@huawei.com>
Reviewed-by: Li Zefan <lizefan@huawei.com>
---
kernel/sched/core.c | 8 +++++++-
kernel/sched/deadline.c | 5 +----
kernel/sched/fair.c | 8 --------
3 files changed, 8 insertions(+), 13 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 3bdf01b..7f066c2 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -442,8 +442,14 @@ static void __hrtick_start(void *arg)
void hrtick_start(struct rq *rq, u64 delay)
{
struct hrtimer *timer = &rq->hrtick_timer;
- ktime_t time = ktime_add_ns(timer->base->get_time(), delay);
+ ktime_t time;

+ /*
+ * Don't schedule slices shorter than 10000ns, that just
+ * doesn't make sense and can cause timer DoS.
+ */
+ s64 delta = max_t(s64, delay, 10000LL);
+ time = ktime_add_ns(timer->base->get_time(), delta);
hrtimer_set_expires(timer, time);

if (rq == this_rq()) {
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index fc4f98b1..9135771 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -997,10 +997,7 @@ static void check_preempt_curr_dl(struct rq *rq, struct task_struct *p,
#ifdef CONFIG_SCHED_HRTICK
static void start_hrtick_dl(struct rq *rq, struct task_struct *p)
{
- s64 delta = p->dl.dl_runtime - p->dl.runtime;
-
- if (delta > 10000)
- hrtick_start(rq, p->dl.runtime);
+ hrtick_start(rq, p->dl.runtime);
}
#endif

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index fea7d33..e5cfd57 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3857,14 +3857,6 @@ static void hrtick_start_fair(struct rq *rq, struct task_struct *p)
resched_task(p);
return;
}
-
- /*
- * Don't schedule slices shorter than 10000ns, that just
- * doesn't make sense. Rely on vruntime for fairness.
- */
- if (rq->curr != p)
- delta = max_t(s64, 10000LL, delta);
-
hrtick_start(rq, delta);
}
}
--
1.7.9.5


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