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    Subject[patch 1/8] Add rt_nr_running accounting
    This patch adds accounting to keep track of the number of RT tasks running
    on a runqueue. This information will be used in later patches.

    Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

    ---
    kernel/sched.c | 2 ++
    kernel/sched_rt.c | 18 ++++++++++++++++++
    2 files changed, 20 insertions(+)

    Index: linux-test.git/kernel/sched.c
    ===================================================================
    --- linux-test.git.orig/kernel/sched.c 2007-10-19 12:32:39.000000000 -0400
    +++ linux-test.git/kernel/sched.c 2007-10-19 12:33:09.000000000 -0400
    @@ -300,6 +300,8 @@ struct rq {
    */
    unsigned long nr_uninterruptible;

    + unsigned long rt_nr_running;
    +
    struct task_struct *curr, *idle;
    unsigned long next_balance;
    struct mm_struct *prev_mm;
    Index: linux-test.git/kernel/sched_rt.c
    ===================================================================
    --- linux-test.git.orig/kernel/sched_rt.c 2007-10-19 12:31:08.000000000 -0400
    +++ linux-test.git/kernel/sched_rt.c 2007-10-19 12:33:09.000000000 -0400
    @@ -25,12 +25,28 @@ static void update_curr_rt(struct rq *rq
    curr->se.exec_start = rq->clock;
    }

    +static inline void inc_rt_tasks(struct task_struct *p, struct rq *rq)
    +{
    + if (rt_task(p))
    + rq->rt_nr_running++;
    +}
    +
    +static inline void dec_rt_tasks(struct task_struct *p, struct rq *rq)
    +{
    + if (rt_task(p)) {
    + WARN_ON(!rq->rt_nr_running);
    + rq->rt_nr_running--;
    + }
    +}
    +
    static void enqueue_task_rt(struct rq *rq, struct task_struct *p, int wakeup)
    {
    struct rt_prio_array *array = &rq->rt.active;

    list_add_tail(&p->run_list, array->queue + p->prio);
    __set_bit(p->prio, array->bitmap);
    +
    + inc_rt_tasks(p, rq);
    }

    /*
    @@ -42,6 +58,8 @@ static void dequeue_task_rt(struct rq *r

    update_curr_rt(rq);

    + dec_rt_tasks(p, rq);
    +
    list_del(&p->run_list);
    if (list_empty(array->queue + p->prio))
    __clear_bit(p->prio, array->bitmap);
    --
    -
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