* Update the current task's runtime statistics. Skip current tasks that
* are not in our scheduling class.
*/
-static inline void update_curr_rt(struct rq *rq, u64 now)
+static inline void update_curr_rt(struct rq *rq)
{
struct task_struct *curr = rq->curr;
u64 delta_exec;
if (!task_has_rt_policy(curr))
return;
- delta_exec = now - curr->se.exec_start;
+ delta_exec = rq->clock - curr->se.exec_start;
if (unlikely((s64)delta_exec < 0))
delta_exec = 0;
schedstat_set(curr->se.exec_max, max(curr->se.exec_max, delta_exec));
curr->se.sum_exec_runtime += delta_exec;
- curr->se.exec_start = now;
+ curr->se.exec_start = rq->clock;
}
-static void
-enqueue_task_rt(struct rq *rq, struct task_struct *p, int wakeup, u64 now)
+static void enqueue_task_rt(struct rq *rq, struct task_struct *p, int wakeup)
{
struct rt_prio_array *array = &rq->rt.active;
/*
* Adding/removing a task to/from a priority array:
*/
-static void
-dequeue_task_rt(struct rq *rq, struct task_struct *p, int sleep, u64 now)
+static void dequeue_task_rt(struct rq *rq, struct task_struct *p, int sleep)
{
struct rt_prio_array *array = &rq->rt.active;
- update_curr_rt(rq, now);
+ update_curr_rt(rq);
list_del(&p->run_list);
if (list_empty(array->queue + p->prio))
resched_task(rq->curr);
}
-static struct task_struct *pick_next_task_rt(struct rq *rq, u64 now)
+static struct task_struct *pick_next_task_rt(struct rq *rq)
{
struct rt_prio_array *array = &rq->rt.active;
struct task_struct *next;
queue = array->queue + idx;
next = list_entry(queue->next, struct task_struct, run_list);
- next->se.exec_start = now;
+ next->se.exec_start = rq->clock;
return next;
}
-static void put_prev_task_rt(struct rq *rq, struct task_struct *p, u64 now)
+static void put_prev_task_rt(struct rq *rq, struct task_struct *p)
{
- update_curr_rt(rq, now);
+ update_curr_rt(rq);
p->se.exec_start = 0;
}
return;
p->time_slice = static_prio_timeslice(p->static_prio);
- set_tsk_need_resched(p);
- /* put it at the end of the queue: */
- requeue_task_rt(rq, p);
+ /*
+ * Requeue to the end of queue if we are not the only element
+ * on the queue:
+ */
+ if (p->run_list.prev != p->run_list.next) {
+ requeue_task_rt(rq, p);
+ set_tsk_need_resched(p);
+ }
}
static struct sched_class rt_sched_class __read_mostly = {