sched: push RT tasks from overloaded CPUs
This patch adds pushing of overloaded RT tasks from a runqueue that is
having tasks (most likely RT tasks) added to the run queue.
TODO: We don't cover the case of waking of new RT tasks (yet).
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index bacb320..d38a8a5 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -558,6 +558,15 @@
}
}
+
+static void wakeup_balance_rt(struct rq *rq, struct task_struct *p)
+{
+ if (unlikely(rt_task(p)) &&
+ !task_running(rq, p) &&
+ (p->prio >= rq->curr->prio))
+ push_rt_tasks(rq);
+}
+
/*
* Load-balancing iterator. Note: while the runqueue stays locked
* during the whole iteration, the current task might be
@@ -665,6 +674,7 @@
#else /* CONFIG_SMP */
# define schedule_tail_balance_rt(rq) do { } while (0)
# define schedule_balance_rt(rq, prev) do { } while (0)
+# define wakeup_balance_rt(rq, p) do { } while (0)
#endif /* CONFIG_SMP */
static void task_tick_rt(struct rq *rq, struct task_struct *p)
