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    Subject[PATCH v3 01/17] 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 <srostedt@redhat.com>

    ---
    kernel/sched.c | 1 +
    kernel/sched_rt.c | 17 +++++++++++++++++
    2 files changed, 18 insertions(+)

    Index: linux-compile.git/kernel/sched.c
    ===================================================================
    --- linux-compile.git.orig/kernel/sched.c 2007-11-16 11:16:38.000000000 -0500
    +++ linux-compile.git/kernel/sched.c 2007-11-16 21:48:48.000000000 -0500
    @@ -266,6 +266,7 @@ struct rt_rq {
    struct rt_prio_array active;
    int rt_load_balance_idx;
    struct list_head *rt_load_balance_head, *rt_load_balance_curr;
    + unsigned long rt_nr_running;
    };

    /*
    Index: linux-compile.git/kernel/sched_rt.c
    ===================================================================
    --- linux-compile.git.orig/kernel/sched_rt.c 2007-11-16 11:15:56.000000000 -0500
    +++ linux-compile.git/kernel/sched_rt.c 2007-11-16 21:48:48.000000000 -0500
    @@ -25,12 +25,27 @@ 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)
    +{
    + WARN_ON(!rt_task(p));
    + rq->rt.rt_nr_running++;
    +}
    +
    +static inline void dec_rt_tasks(struct task_struct *p, struct rq *rq)
    +{
    + WARN_ON(!rt_task(p));
    + WARN_ON(!rq->rt.rt_nr_running);
    + rq->rt.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);
    }

    /*
    @@ -45,6 +60,8 @@ static void dequeue_task_rt(struct rq *r
    list_del(&p->run_list);
    if (list_empty(array->queue + p->prio))
    __clear_bit(p->prio, array->bitmap);
    +
    + dec_rt_tasks(p, rq);
    }

    /*
    --
    -
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