linux-kernel - [PATCH 01/23] Subject: SCHED - Add rt_nr

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Date:	Tue, 04 Dec 2007 15:44:31 -0500
From:	Gregory Haskins <ghaskins@...ell.com>
To:	mingo@...e.hu
Cc:	rostedt@...dmis.org, ghaskins@...ell.com,
	linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 01/23] Subject: SCHED - Add rt_nr_running accounting

From: Steven Rostedt <srostedt@...hat.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@...hat.com>
Signed-off-by: Gregory Haskins <ghaskins@...ell.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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