sched: RT-balance, add new methods to sched_class

Dmitry Adamushko found that the current implementation of the RT
balancing code left out changes to the sched_setscheduler and
rt_mutex_setprio.

This patch addresses this issue by adding methods to the schedule classes
to handle being switched out of (switched_from) and being switched into
(switched_to) a sched_class. Also a method for changing of priorities
is also added (prio_changed).

This patch also removes some duplicate logic between rt_mutex_setprio and
sched_setscheduler.

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

1 files changed, 7 insertions, 0 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index c67d2c2f0111..f2044e707004 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -855,6 +855,13 @@ struct sched_class {
 
         void (*join_domain)(struct rq *rq);
         void (*leave_domain)(struct rq *rq);
+
+        void (*switched_from) (struct rq *this_rq, struct task_struct *task,
+                               int running);
+        void (*switched_to) (struct rq *this_rq, struct task_struct *task,
+                             int running);
+        void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
+                             int oldprio, int running);
 };
 
 struct load_weight {