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