static struct rq *dl_task_offline_migration(struct rq *rq, struct task_struct *p)
{
struct rq *later_rq = NULL;
+ struct dl_bw *dl_b;
later_rq = find_lock_later_rq(p, rq);
if (!later_rq) {
double_lock_balance(rq, later_rq);
}
+ if (p->dl.dl_non_contending || p->dl.dl_throttled) {
+ /*
+ * Inactive timer is armed (or callback is running, but
+ * waiting for us to release rq locks). In any case, when it
+ * will fire (or continue), it will see running_bw of this
+ * task migrated to later_rq (and correctly handle it).
+ */
+ sub_running_bw(&p->dl, &rq->dl);
+ sub_rq_bw(&p->dl, &rq->dl);
+
+ add_rq_bw(&p->dl, &later_rq->dl);
+ add_running_bw(&p->dl, &later_rq->dl);
+ } else {
+ sub_rq_bw(&p->dl, &rq->dl);
+ add_rq_bw(&p->dl, &later_rq->dl);
+ }
+
+ /*
+ * And we finally need to fixup root_domain(s) bandwidth accounting,
+ * since p is still hanging out in the old (now moved to default) root
+ * domain.
+ */
+ dl_b = &rq->rd->dl_bw;
+ raw_spin_lock(&dl_b->lock);
+ __dl_sub(dl_b, p->dl.dl_bw, cpumask_weight(rq->rd->span));
+ raw_spin_unlock(&dl_b->lock);
+
+ dl_b = &later_rq->rd->dl_bw;
+ raw_spin_lock(&dl_b->lock);
+ __dl_add(dl_b, p->dl.dl_bw, cpumask_weight(later_rq->rd->span));
+ raw_spin_unlock(&dl_b->lock);
+
set_task_cpu(p, later_rq->cpu);
double_unlock_balance(later_rq, rq);
}
#endif
-static inline void set_next_task(struct rq *rq, struct task_struct *p)
+static void set_next_task_dl(struct rq *rq, struct task_struct *p)
{
p->se.exec_start = rq_clock_task(rq);
/* You can't push away the running task */
dequeue_pushable_dl_task(rq, p);
+
+ if (hrtick_enabled(rq))
+ start_hrtick_dl(rq, p);
+
+ if (rq->curr->sched_class != &dl_sched_class)
+ update_dl_rq_load_avg(rq_clock_pelt(rq), rq, 0);
+
+ deadline_queue_push_tasks(rq);
}
static struct sched_dl_entity *pick_next_dl_entity(struct rq *rq,
struct task_struct *p;
struct dl_rq *dl_rq;
- dl_rq = &rq->dl;
+ WARN_ON_ONCE(prev || rf);
- if (need_pull_dl_task(rq, prev)) {
- /*
- * This is OK, because current is on_cpu, which avoids it being
- * picked for load-balance and preemption/IRQs are still
- * disabled avoiding further scheduler activity on it and we're
- * being very careful to re-start the picking loop.
- */
- rq_unpin_lock(rq, rf);
- pull_dl_task(rq);
- rq_repin_lock(rq, rf);
- /*
- * pull_dl_task() can drop (and re-acquire) rq->lock; this
- * means a stop task can slip in, in which case we need to
- * re-start task selection.
- */
- if (rq->stop && task_on_rq_queued(rq->stop))
- return RETRY_TASK;
- }
-
- /*
- * When prev is DL, we may throttle it in put_prev_task().
- * So, we update time before we check for dl_nr_running.
- */
- if (prev->sched_class == &dl_sched_class)
- update_curr_dl(rq);
+ dl_rq = &rq->dl;
if (unlikely(!dl_rq->dl_nr_running))
return NULL;
- put_prev_task(rq, prev);
-
dl_se = pick_next_dl_entity(rq, dl_rq);
BUG_ON(!dl_se);
p = dl_task_of(dl_se);
- set_next_task(rq, p);
-
- if (hrtick_enabled(rq))
- start_hrtick_dl(rq, p);
-
- deadline_queue_push_tasks(rq);
-
- if (rq->curr->sched_class != &dl_sched_class)
- update_dl_rq_load_avg(rq_clock_pelt(rq), rq, 0);
+ set_next_task_dl(rq, p);
return p;
}
-static void put_prev_task_dl(struct rq *rq, struct task_struct *p)
+static void put_prev_task_dl(struct rq *rq, struct task_struct *p, struct rq_flags *rf)
{
update_curr_dl(rq);
update_dl_rq_load_avg(rq_clock_pelt(rq), rq, 1);
if (on_dl_rq(&p->dl) && p->nr_cpus_allowed > 1)
enqueue_pushable_dl_task(rq, p);
+
+ if (rf && !on_dl_rq(&p->dl) && need_pull_dl_task(rq, p)) {
+ /*
+ * This is OK, because current is on_cpu, which avoids it being
+ * picked for load-balance and preemption/IRQs are still
+ * disabled avoiding further scheduler activity on it and we've
+ * not yet started the picking loop.
+ */
+ rq_unpin_lock(rq, rf);
+ pull_dl_task(rq);
+ rq_repin_lock(rq, rf);
+ }
}
/*
*/
}
-static void set_curr_task_dl(struct rq *rq)
-{
- set_next_task(rq, rq->curr);
-}
-
#ifdef CONFIG_SMP
/* Only try algorithms three times */
GFP_KERNEL, cpu_to_node(i));
}
+void dl_add_task_root_domain(struct task_struct *p)
+{
+ struct rq_flags rf;
+ struct rq *rq;
+ struct dl_bw *dl_b;
+
+ rq = task_rq_lock(p, &rf);
+ if (!dl_task(p))
+ goto unlock;
+
+ dl_b = &rq->rd->dl_bw;
+ raw_spin_lock(&dl_b->lock);
+
+ __dl_add(dl_b, p->dl.dl_bw, cpumask_weight(rq->rd->span));
+
+ raw_spin_unlock(&dl_b->lock);
+
+unlock:
+ task_rq_unlock(rq, p, &rf);
+}
+
+void dl_clear_root_domain(struct root_domain *rd)
+{
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&rd->dl_bw.lock, flags);
+ rd->dl_bw.total_bw = 0;
+ raw_spin_unlock_irqrestore(&rd->dl_bw.lock, flags);
+}
+
#endif /* CONFIG_SMP */
static void switched_from_dl(struct rq *rq, struct task_struct *p)
.pick_next_task = pick_next_task_dl,
.put_prev_task = put_prev_task_dl,
+ .set_next_task = set_next_task_dl,
#ifdef CONFIG_SMP
.select_task_rq = select_task_rq_dl,
.task_woken = task_woken_dl,
#endif
- .set_curr_task = set_curr_task_dl,
.task_tick = task_tick_dl,
.task_fork = task_fork_dl,
projects / linux.git / blobdiff