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    Subject[PATCH v4 06/20] 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 <srostedt@redhat.com>
    ---

    kernel/sched.c | 3 +++
    kernel/sched_rt.c | 10 ++++++++++
    2 files changed, 13 insertions(+)

    Index: linux-compile.git/kernel/sched.c
    ===================================================================
    --- linux-compile.git.orig/kernel/sched.c 2007-11-20 19:52:59.000000000 -0500
    +++ linux-compile.git/kernel/sched.c 2007-11-20 19:53:00.000000000 -0500
    @@ -22,6 +22,8 @@
    * 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
    + * (with thanks to Gregory Haskins)
    */

    #include <linux/mm.h>
    @@ -1635,6 +1637,7 @@ out_activate:

    out_running:
    p->state = TASK_RUNNING;
    + wakeup_balance_rt(rq, p);
    out:
    task_rq_unlock(rq, &flags);

    Index: linux-compile.git/kernel/sched_rt.c
    ===================================================================
    --- linux-compile.git.orig/kernel/sched_rt.c 2007-11-20 19:52:59.000000000 -0500
    +++ linux-compile.git/kernel/sched_rt.c 2007-11-20 19:53:00.000000000 -0500
    @@ -555,6 +555,15 @@ static void schedule_tail_balance_rt(str
    }
    }

    +
    +static void wakeup_balance_rt(struct rq *rq, struct task_struct *p)
    +{
    + if (unlikely(rt_task(p)) &&
    + !task_running(rq, p) &&
    + (p->prio >= rq->curr->prio))
    + push_rt_tasks(rq);
    +}
    +
    /*
    * Load-balancing iterator. Note: while the runqueue stays locked
    * during the whole iteration, the current task might be
    @@ -662,6 +671,7 @@ move_one_task_rt(struct rq *this_rq, int
    #else /* CONFIG_SMP */
    # define schedule_tail_balance_rt(rq) do { } while (0)
    # define schedule_balance_rt(rq, prev) do { } while (0)
    +# define wakeup_balance_rt(rq, p) do { } while (0)
    #endif /* CONFIG_SMP */

    static void task_tick_rt(struct rq *rq, struct task_struct *p)
    --
    -
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