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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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