/* Called when the state of tsk changes back to TASK_RUNNING.
* We need to requeue the task.
*
* NOTE: If a sporadic task is suspended for a long time,
* this might actually be an event-driven release of a new job.
*/
static void demo_task_resume(struct task_struct *tsk)
{
unsigned long flags;
struct demo_cpu_state *state = cpu_state_for(get_partition(tsk));
lt_t now;
TRACE_TASK(tsk, "wake_up at %llu\n", litmus_clock());
raw_spin_lock_irqsave(&state->local_queues.ready_lock, flags);
now = litmus_clock();
if (is_sporadic(tsk) && is_tardy(tsk, now)) {
/* This sporadic task was gone for a "long" time and woke up past
* its deadline. Give it a new budget by triggering a job
* release. */
release_at(tsk, now);
}
/* This check is required to avoid races with tasks that resume before
* the scheduler "noticed" that it resumed. That is, the wake up may
* race with the call to schedule(). */
if (state->scheduled != tsk) {
demo_requeue(tsk, state);
if (edf_preemption_needed(&state->local_queues, state->scheduled)) {
preempt_if_preemptable(state->scheduled, state->cpu);
}
}
raw_spin_unlock_irqrestore(&state->local_queues.ready_lock, flags);
}
static void psnedf_task_wake_up(struct task_struct *task)
{
unsigned long flags;
psnedf_domain_t* pedf = task_pedf(task);
rt_domain_t* edf = task_edf(task);
lt_t now;
TRACE_TASK(task, "wake_up at %llu\n", litmus_clock());
raw_readyq_lock_irqsave(&pedf->slock, flags);
set_task_state(task, TASK_RUNNING);
BUG_ON(is_queued(task));
now = litmus_clock();
if (is_sporadic(task) && is_tardy(task, now)
#ifdef CONFIG_LITMUS_LOCKING
/* We need to take suspensions because of semaphores into
* account! If a job resumes after being suspended due to acquiring
* a semaphore, it should never be treated as a new job release.
*/
&& !is_priority_boosted(task)
#endif
) {
/* new sporadic release */
release_at(task, now);
sched_trace_task_release(task);
}
budget_state_machine(task,on_wakeup);
/* Only add to ready queue if it is not the currently-scheduled
* task. This could be the case if a task was woken up concurrently
* on a remote CPU before the executing CPU got around to actually
* de-scheduling the task, i.e., wake_up() raced with schedule()
* and won.
*/
if (pedf->scheduled != task) {
requeue(task, edf);
psnedf_preempt_check(pedf);
}
raw_readyq_unlock_irqrestore(&pedf->slock, flags);
TRACE_TASK(task, "wake up done\n");
}
