[PATCH -v2 6/7] wake up balance RT

[Steven Rostedt <rostedt@goodmis.org>]

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 <rostedt@goodmis.org>
---
 kernel/sched.c    |    2 ++
 kernel/sched_rt.c |   12 ++++++++++++
 2 files changed, 14 insertions(+)

Index: linux-test.git/kernel/sched_rt.c
===================================================================
--- linux-test.git.orig/kernel/sched_rt.c	2007-10-22 22:37:28.000000000 -0400
+++ linux-test.git/kernel/sched_rt.c	2007-10-22 22:38:04.000000000 -0400
@@ -559,9 +559,21 @@ static void schedule_tail_balance_rt(str
 		spin_unlock_irq(&rq->lock);
 	}
 }
+
+static void wakeup_balance_rt(struct rq *rq, struct task_struct *p)
+{
+	if (unlikely(rt_task(p)) &&
+	    (p->prio >= rq->curr->prio)) {
+		/* pull_rt_task needs task to be running */
+		p->state = TASK_RUNNING;
+		push_rt_tasks(rq);
+	}
+}
+
 #else /* CONFIG_SMP */
 # define schedule_tail_balance_rt(rq)	do { } while (0)
 # define schedule_balance_rt(rq)	do { } while (0)
+# define wakeup_balance_rt(rq, p)	do { } while (0)
 #endif /* CONFIG_SMP */
 
 
Index: linux-test.git/kernel/sched.c
===================================================================
--- linux-test.git.orig/kernel/sched.c	2007-10-22 22:37:28.000000000 -0400
+++ linux-test.git/kernel/sched.c	2007-10-22 22:38:04.000000000 -0400
@@ -22,6 +22,7 @@
  *              by Peter Williams
  *  2007-05-06  Interactivity improvements to CFS by Mike Galbraith
  *  2007-07-01  Group scheduling enhancements by Srivatsa Vaddagiri
+ *  2007-10-22  RT overload balancing by Steven Rostedt
  */
 
 #include <linux/mm.h>
@@ -1614,6 +1615,7 @@ out_activate:
 	update_rq_clock(rq);
 	activate_task(rq, p, 1);
 	check_preempt_curr(rq, p);
+	wakeup_balance_rt(rq, p);
 	success = 1;
 
 out_running:

-- 
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