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 --- kernel/sched.c | 1 + kernel/sched_rt.c | 17 +++++++++++++++++ 2 files changed, 18 insertions(+) Index: linux-test.git/kernel/sched.c =================================================================== --- linux-test.git.orig/kernel/sched.c 2007-10-22 22:18:53.000000000 -0400 +++ linux-test.git/kernel/sched.c 2007-10-22 22:31:51.000000000 -0400 @@ -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-test.git/kernel/sched_rt.c =================================================================== --- linux-test.git.orig/kernel/sched_rt.c 2007-10-22 22:18:53.000000000 -0400 +++ linux-test.git/kernel/sched_rt.c 2007-10-22 22:31:51.000000000 -0400 @@ -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); } /* -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/