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Subject[PATCH 01/23] Subject: SCHED - Add rt_nr_running accounting
Date
From: Steven Rostedt <srostedt@redhat.com>

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>
Signed-off-by: Gregory Haskins <ghaskins@novell.com>
---
kernel/sched.c | 1 +
kernel/sched_rt.c | 17 +++++++++++++++++
2 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/kernel/sched.c b/kernel/sched.c
index b062856..4751c2f 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -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;
};

/*
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index ee9c8b6..a6271f4 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -26,12 +26,27 @@ static void update_curr_rt(struct rq *rq)
cpuacct_charge(curr, delta_exec);
}

+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);
}

/*
@@ -46,6 +61,8 @@ static void dequeue_task_rt(struct rq *rq, struct task_struct *p, int sleep)
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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