sched: pull RT tasks from overloaded runqueues

This patch adds the algorithm to pull tasks from RT overloaded runqueues.

When a pull RT is initiated, all overloaded runqueues are examined for
a RT task that is higher in prio than the highest prio task queued on the
target runqueue. If another runqueue holds a RT task that is of higher
prio than the highest prio task on the target runqueue is found it is pulled
to the target runqueue.

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

1 files changed, 2 insertions, 0 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index 97cab609fc31..c91797107913 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3721,6 +3721,8 @@ need_resched_nonpreemptible:
                 switch_count = &prev->nvcsw;
         }
 
+        schedule_balance_rt(rq, prev);
+
         if (unlikely(!rq->nr_running))
                 idle_balance(cpu, rq);