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authorJuri Lelli <juri.lelli@gmail.com>2017-12-12 12:10:24 +0100
committerIngo Molnar <mingo@kernel.org>2018-01-10 11:30:31 +0100
commit34be39305a77b8b1ec9f279163c7cdb6cc719b91 (patch)
tree1d970e5d92e508630d575814a3bae1181ed85348 /kernel/sched
parent7332dec055f2457c386032f7e9b2991eb05c2a0a (diff)
sched/deadline: Implement "runtime overrun signal" support
This patch adds the possibility of getting the delivery of a SIGXCPU signal whenever there is a runtime overrun. The request is done through the sched_flags field within the sched_attr structure. Forward port of https://lkml.org/lkml/2009/10/16/170 Tested-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Juri Lelli <juri.lelli@gmail.com> Signed-off-by: Claudio Scordino <claudio@evidence.eu.com> Signed-off-by: Luca Abeni <luca.abeni@santannapisa.it> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tommaso Cucinotta <tommaso.cucinotta@sssup.it> Link: http://lkml.kernel.org/r/1513077024-25461-1-git-send-email-claudio@evidence.eu.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched')
-rw-r--r--kernel/sched/core.c3
-rw-r--r--kernel/sched/deadline.c7
2 files changed, 8 insertions, 2 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index a794f8155cd5..e28391bf8b04 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4085,8 +4085,7 @@ recheck:
return -EINVAL;
}
- if (attr->sched_flags &
- ~(SCHED_FLAG_RESET_ON_FORK | SCHED_FLAG_RECLAIM))
+ if (attr->sched_flags & ~SCHED_FLAG_ALL)
return -EINVAL;
/*
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 2473736c7616..4c666dbe5038 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -1155,6 +1155,12 @@ static void update_curr_dl(struct rq *rq)
throttle:
if (dl_runtime_exceeded(dl_se) || dl_se->dl_yielded) {
dl_se->dl_throttled = 1;
+
+ /* If requested, inform the user about runtime overruns. */
+ if (dl_runtime_exceeded(dl_se) &&
+ (dl_se->flags & SCHED_FLAG_DL_OVERRUN))
+ dl_se->dl_overrun = 1;
+
__dequeue_task_dl(rq, curr, 0);
if (unlikely(dl_se->dl_boosted || !start_dl_timer(curr)))
enqueue_task_dl(rq, curr, ENQUEUE_REPLENISH);
@@ -2566,6 +2572,7 @@ void __dl_clear_params(struct task_struct *p)
dl_se->dl_throttled = 0;
dl_se->dl_yielded = 0;
dl_se->dl_non_contending = 0;
+ dl_se->dl_overrun = 0;
}
bool dl_param_changed(struct task_struct *p, const struct sched_attr *attr)