sched: RT-balance, replace hooks with pre/post schedule and wakeup methods

To make the main sched.c code more agnostic to the schedule classes.
Instead of having specific hooks in the schedule code for the RT class
balancing. They are replaced with a pre_schedule, post_schedule
and task_wake_up methods. These methods may be used by any of the classes
but currently, only the sched_rt class implements them.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 16 insertions, 4 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index 9d6fb73..2368a0d 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1625,7 +1625,10 @@ out_activate:
 
 out_running:
 	p->state = TASK_RUNNING;
-	wakeup_balance_rt(rq, p);
+#ifdef CONFIG_SMP
+	if (p->sched_class->task_wake_up)
+		p->sched_class->task_wake_up(rq, p);
+#endif
 out:
 	task_rq_unlock(rq, &flags);
 
@@ -1748,7 +1751,10 @@ void fastcall wake_up_new_task(struct task_struct *p, unsigned long clone_flags)
 		inc_nr_running(p, rq);
 	}
 	check_preempt_curr(rq, p);
-	wakeup_balance_rt(rq, p);
+#ifdef CONFIG_SMP
+	if (p->sched_class->task_wake_up)
+		p->sched_class->task_wake_up(rq, p);
+#endif
 	task_rq_unlock(rq, &flags);
 }
 
@@ -1869,7 +1875,10 @@ static void finish_task_switch(struct rq *rq, struct task_struct *prev)
 	prev_state = prev->state;
 	finish_arch_switch(prev);
 	finish_lock_switch(rq, prev);
-	schedule_tail_balance_rt(rq);
+#ifdef CONFIG_SMP
+	if (current->sched_class->post_schedule)
+		current->sched_class->post_schedule(rq);
+#endif
 
 	fire_sched_in_preempt_notifiers(current);
 	if (mm)
@@ -3638,7 +3647,10 @@ need_resched_nonpreemptible:
 		switch_count = &prev->nvcsw;
 	}
 
-	schedule_balance_rt(rq, prev);
+#ifdef CONFIG_SMP
+	if (prev->sched_class->pre_schedule)
+		prev->sched_class->pre_schedule(rq, prev);
+#endif
 
 	if (unlikely(!rq->nr_running))
 		idle_balance(cpu, rq);