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author | Thomas Gleixner <tglx@linutronix.de> | 2015-05-19 16:12:32 +0200 |
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committer | Thomas Gleixner <tglx@linutronix.de> | 2015-05-19 16:12:32 +0200 |
commit | c3b5d3cea508d2c8ff493ef18c45a9cc58fb7015 (patch) | |
tree | a80672ee82fcc3d9c8d486e53731eb19cd968eb0 /kernel/sched | |
parent | daa67b4b70568a07fef3cffacb2055891bf42ddb (diff) | |
parent | e26081808edadfd257c6c9d81014e3b25e9a6118 (diff) | |
download | linux-stable-c3b5d3cea508d2c8ff493ef18c45a9cc58fb7015.tar.gz linux-stable-c3b5d3cea508d2c8ff493ef18c45a9cc58fb7015.tar.bz2 linux-stable-c3b5d3cea508d2c8ff493ef18c45a9cc58fb7015.zip |
Merge branch 'linus' into timers/core
Make sure the upstream fixes are applied before adding further
modifications.
Diffstat (limited to 'kernel/sched')
-rw-r--r-- | kernel/sched/core.c | 69 | ||||
-rw-r--r-- | kernel/sched/idle.c | 16 |
2 files changed, 28 insertions, 57 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index e84aeb280777..ecb7c4216350 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -995,13 +995,6 @@ void check_preempt_curr(struct rq *rq, struct task_struct *p, int flags) rq_clock_skip_update(rq, true); } -static ATOMIC_NOTIFIER_HEAD(task_migration_notifier); - -void register_task_migration_notifier(struct notifier_block *n) -{ - atomic_notifier_chain_register(&task_migration_notifier, n); -} - #ifdef CONFIG_SMP void set_task_cpu(struct task_struct *p, unsigned int new_cpu) { @@ -1032,18 +1025,10 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu) trace_sched_migrate_task(p, new_cpu); if (task_cpu(p) != new_cpu) { - struct task_migration_notifier tmn; - if (p->sched_class->migrate_task_rq) p->sched_class->migrate_task_rq(p, new_cpu); p->se.nr_migrations++; perf_sw_event_sched(PERF_COUNT_SW_CPU_MIGRATIONS, 1, 0); - - tmn.task = p; - tmn.from_cpu = task_cpu(p); - tmn.to_cpu = new_cpu; - - atomic_notifier_call_chain(&task_migration_notifier, 0, &tmn); } __set_task_cpu(p, new_cpu); @@ -3294,15 +3279,18 @@ static void __setscheduler_params(struct task_struct *p, /* Actually do priority change: must hold pi & rq lock. */ static void __setscheduler(struct rq *rq, struct task_struct *p, - const struct sched_attr *attr) + const struct sched_attr *attr, bool keep_boost) { __setscheduler_params(p, attr); /* - * If we get here, there was no pi waiters boosting the - * task. It is safe to use the normal prio. + * Keep a potential priority boosting if called from + * sched_setscheduler(). */ - p->prio = normal_prio(p); + if (keep_boost) + p->prio = rt_mutex_get_effective_prio(p, normal_prio(p)); + else + p->prio = normal_prio(p); if (dl_prio(p->prio)) p->sched_class = &dl_sched_class; @@ -3402,7 +3390,7 @@ static int __sched_setscheduler(struct task_struct *p, int newprio = dl_policy(attr->sched_policy) ? MAX_DL_PRIO - 1 : MAX_RT_PRIO - 1 - attr->sched_priority; int retval, oldprio, oldpolicy = -1, queued, running; - int policy = attr->sched_policy; + int new_effective_prio, policy = attr->sched_policy; unsigned long flags; const struct sched_class *prev_class; struct rq *rq; @@ -3584,15 +3572,14 @@ change: oldprio = p->prio; /* - * Special case for priority boosted tasks. - * - * If the new priority is lower or equal (user space view) - * than the current (boosted) priority, we just store the new + * Take priority boosted tasks into account. If the new + * effective priority is unchanged, we just store the new * normal parameters and do not touch the scheduler class and * the runqueue. This will be done when the task deboost * itself. */ - if (rt_mutex_check_prio(p, newprio)) { + new_effective_prio = rt_mutex_get_effective_prio(p, newprio); + if (new_effective_prio == oldprio) { __setscheduler_params(p, attr); task_rq_unlock(rq, p, &flags); return 0; @@ -3606,7 +3593,7 @@ change: put_prev_task(rq, p); prev_class = p->sched_class; - __setscheduler(rq, p, attr); + __setscheduler(rq, p, attr, true); if (running) p->sched_class->set_curr_task(rq); @@ -6991,27 +6978,23 @@ static int cpuset_cpu_inactive(struct notifier_block *nfb, unsigned long action, unsigned long flags; long cpu = (long)hcpu; struct dl_bw *dl_b; + bool overflow; + int cpus; - switch (action & ~CPU_TASKS_FROZEN) { + switch (action) { case CPU_DOWN_PREPARE: - /* explicitly allow suspend */ - if (!(action & CPU_TASKS_FROZEN)) { - bool overflow; - int cpus; - - rcu_read_lock_sched(); - dl_b = dl_bw_of(cpu); + rcu_read_lock_sched(); + dl_b = dl_bw_of(cpu); - raw_spin_lock_irqsave(&dl_b->lock, flags); - cpus = dl_bw_cpus(cpu); - overflow = __dl_overflow(dl_b, cpus, 0, 0); - raw_spin_unlock_irqrestore(&dl_b->lock, flags); + raw_spin_lock_irqsave(&dl_b->lock, flags); + cpus = dl_bw_cpus(cpu); + overflow = __dl_overflow(dl_b, cpus, 0, 0); + raw_spin_unlock_irqrestore(&dl_b->lock, flags); - rcu_read_unlock_sched(); + rcu_read_unlock_sched(); - if (overflow) - return notifier_from_errno(-EBUSY); - } + if (overflow) + return notifier_from_errno(-EBUSY); cpuset_update_active_cpus(false); break; case CPU_DOWN_PREPARE_FROZEN: @@ -7340,7 +7323,7 @@ static void normalize_task(struct rq *rq, struct task_struct *p) queued = task_on_rq_queued(p); if (queued) dequeue_task(rq, p, 0); - __setscheduler(rq, p, &attr); + __setscheduler(rq, p, &attr, false); if (queued) { enqueue_task(rq, p, 0); resched_curr(rq); diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c index deef1caa94c6..fefcb1fa5160 100644 --- a/kernel/sched/idle.c +++ b/kernel/sched/idle.c @@ -81,7 +81,6 @@ static void cpuidle_idle_call(void) struct cpuidle_device *dev = __this_cpu_read(cpuidle_devices); struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev); int next_state, entered_state; - unsigned int broadcast; bool reflect; /* @@ -150,17 +149,6 @@ static void cpuidle_idle_call(void) goto exit_idle; } - broadcast = drv->states[next_state].flags & CPUIDLE_FLAG_TIMER_STOP; - - /* - * Tell the time framework to switch to a broadcast timer - * because our local timer will be shutdown. If a local timer - * is used from another cpu as a broadcast timer, this call may - * fail if it is not available - */ - if (broadcast && tick_broadcast_enter()) - goto use_default; - /* Take note of the planned idle state. */ idle_set_state(this_rq(), &drv->states[next_state]); @@ -174,8 +162,8 @@ static void cpuidle_idle_call(void) /* The cpu is no longer idle or about to enter idle. */ idle_set_state(this_rq(), NULL); - if (broadcast) - tick_broadcast_exit(); + if (entered_state == -EBUSY) + goto use_default; /* * Give the governor an opportunity to reflect on the outcome |