sched: count # of queued RT tasks
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: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/sched.c b/kernel/sched.c
index 5b3d465..9dd8d12 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -342,6 +342,7 @@
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 cefcd51..e3d2ca8 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -26,6 +26,19 @@
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;
@@ -33,6 +46,8 @@
list_add_tail(&p->run_list, array->queue + p->prio);
__set_bit(p->prio, array->bitmap);
inc_cpu_load(rq, p->se.load.weight);
+
+ inc_rt_tasks(p, rq);
}
/*
@@ -48,6 +63,8 @@
if (list_empty(array->queue + p->prio))
__clear_bit(p->prio, array->bitmap);
dec_cpu_load(rq, p->se.load.weight);
+
+ dec_rt_tasks(p, rq);
}
/*