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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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