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authorPeter Zijlstra <peterz@infradead.org>2015-06-11 15:46:41 +0300
committerThomas Gleixner <tglx@linutronix.de>2015-06-19 01:25:26 +0300
commitfd7a4bed183523275279c9addbf42fce550c2e90 (patch)
treedbc5e639a704774c0278ee3e6e95ecb682dbff58 /kernel/sched
parent8046d6806247088de5725eaf8a2580b29e50ac5a (diff)
downloadlinux-fd7a4bed183523275279c9addbf42fce550c2e90.tar.xz
sched, rt: Convert switched_{from, to}_rt() / prio_changed_rt() to balance callbacks
Remove the direct {push,pull} balancing operations from switched_{from,to}_rt() / prio_changed_rt() and use the balance callback queue. Again, err on the side of too many reschedules; since too few is a hard bug while too many is just annoying. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: ktkhai@parallels.com Cc: rostedt@goodmis.org Cc: juri.lelli@gmail.com Cc: pang.xunlei@linaro.org Cc: oleg@redhat.com Cc: wanpeng.li@linux.intel.com Cc: umgwanakikbuti@gmail.com Link: http://lkml.kernel.org/r/20150611124742.766832367@infradead.org Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/sched')
-rw-r--r--kernel/sched/rt.c35
1 files changed, 19 insertions, 16 deletions
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index c702b48de9f0..460f85888b74 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -354,16 +354,23 @@ static inline int has_pushable_tasks(struct rq *rq)
return !plist_head_empty(&rq->rt.pushable_tasks);
}
-static DEFINE_PER_CPU(struct callback_head, rt_balance_head);
+static DEFINE_PER_CPU(struct callback_head, rt_push_head);
+static DEFINE_PER_CPU(struct callback_head, rt_pull_head);
static void push_rt_tasks(struct rq *);
+static void pull_rt_task(struct rq *);
static inline void queue_push_tasks(struct rq *rq)
{
if (!has_pushable_tasks(rq))
return;
- queue_balance_callback(rq, &per_cpu(rt_balance_head, rq->cpu), push_rt_tasks);
+ queue_balance_callback(rq, &per_cpu(rt_push_head, rq->cpu), push_rt_tasks);
+}
+
+static inline void queue_pull_task(struct rq *rq)
+{
+ queue_balance_callback(rq, &per_cpu(rt_pull_head, rq->cpu), pull_rt_task);
}
static void enqueue_pushable_task(struct rq *rq, struct task_struct *p)
@@ -2139,7 +2146,7 @@ static void switched_from_rt(struct rq *rq, struct task_struct *p)
if (!task_on_rq_queued(p) || rq->rt.rt_nr_running)
return;
- pull_rt_task(rq);
+ queue_pull_task(rq);
}
void __init init_sched_rt_class(void)
@@ -2160,8 +2167,6 @@ void __init init_sched_rt_class(void)
*/
static void switched_to_rt(struct rq *rq, struct task_struct *p)
{
- int check_resched = 1;
-
/*
* If we are already running, then there's nothing
* that needs to be done. But if we are not running
@@ -2171,13 +2176,12 @@ static void switched_to_rt(struct rq *rq, struct task_struct *p)
*/
if (task_on_rq_queued(p) && rq->curr != p) {
#ifdef CONFIG_SMP
- if (p->nr_cpus_allowed > 1 && rq->rt.overloaded &&
- /* Don't resched if we changed runqueues */
- push_rt_task(rq) && rq != task_rq(p))
- check_resched = 0;
-#endif /* CONFIG_SMP */
- if (check_resched && p->prio < rq->curr->prio)
+ if (p->nr_cpus_allowed > 1 && rq->rt.overloaded)
+ queue_push_tasks(rq);
+#else
+ if (p->prio < rq->curr->prio)
resched_curr(rq);
+#endif /* CONFIG_SMP */
}
}
@@ -2198,14 +2202,13 @@ prio_changed_rt(struct rq *rq, struct task_struct *p, int oldprio)
* may need to pull tasks to this runqueue.
*/
if (oldprio < p->prio)
- pull_rt_task(rq);
+ queue_pull_task(rq);
+
/*
* If there's a higher priority task waiting to run
- * then reschedule. Note, the above pull_rt_task
- * can release the rq lock and p could migrate.
- * Only reschedule if p is still on the same runqueue.
+ * then reschedule.
*/
- if (p->prio > rq->rt.highest_prio.curr && rq->curr == p)
+ if (p->prio > rq->rt.highest_prio.curr)
resched_curr(rq);
#else
/* For UP simply resched on drop of prio */