sched/rt: Move RT related code from sched/core.c to sched/rt.c
This helps making sched/core.c smaller and hopefully easier to understand and maintain. Signed-off-by: Nicolas Pitre <nico@linaro.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20170621182203.30626-3-nicolas.pitre@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Nicolas Pitre
Ingo Molnar
parent
06a76fe08d
commit
8887cd9903
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@ -6224,321 +6224,6 @@ void sched_move_task(struct task_struct *tsk)
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task_rq_unlock(rq, tsk, &rf);
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}
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#endif /* CONFIG_CGROUP_SCHED */
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#ifdef CONFIG_RT_GROUP_SCHED
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/*
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* Ensure that the real time constraints are schedulable.
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*/
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static DEFINE_MUTEX(rt_constraints_mutex);
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/* Must be called with tasklist_lock held */
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static inline int tg_has_rt_tasks(struct task_group *tg)
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{
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struct task_struct *g, *p;
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/*
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* Autogroups do not have RT tasks; see autogroup_create().
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*/
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if (task_group_is_autogroup(tg))
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return 0;
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for_each_process_thread(g, p) {
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if (rt_task(p) && task_group(p) == tg)
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return 1;
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}
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return 0;
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}
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struct rt_schedulable_data {
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struct task_group *tg;
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u64 rt_period;
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u64 rt_runtime;
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};
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static int tg_rt_schedulable(struct task_group *tg, void *data)
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{
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struct rt_schedulable_data *d = data;
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struct task_group *child;
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unsigned long total, sum = 0;
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u64 period, runtime;
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period = ktime_to_ns(tg->rt_bandwidth.rt_period);
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runtime = tg->rt_bandwidth.rt_runtime;
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if (tg == d->tg) {
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period = d->rt_period;
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runtime = d->rt_runtime;
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}
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/*
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* Cannot have more runtime than the period.
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*/
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if (runtime > period && runtime != RUNTIME_INF)
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return -EINVAL;
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/*
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* Ensure we don't starve existing RT tasks.
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*/
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if (rt_bandwidth_enabled() && !runtime && tg_has_rt_tasks(tg))
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return -EBUSY;
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total = to_ratio(period, runtime);
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/*
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* Nobody can have more than the global setting allows.
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*/
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if (total > to_ratio(global_rt_period(), global_rt_runtime()))
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return -EINVAL;
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/*
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* The sum of our children's runtime should not exceed our own.
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*/
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list_for_each_entry_rcu(child, &tg->children, siblings) {
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period = ktime_to_ns(child->rt_bandwidth.rt_period);
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runtime = child->rt_bandwidth.rt_runtime;
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if (child == d->tg) {
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period = d->rt_period;
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runtime = d->rt_runtime;
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}
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sum += to_ratio(period, runtime);
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}
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if (sum > total)
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return -EINVAL;
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return 0;
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}
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static int __rt_schedulable(struct task_group *tg, u64 period, u64 runtime)
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{
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int ret;
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struct rt_schedulable_data data = {
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.tg = tg,
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.rt_period = period,
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.rt_runtime = runtime,
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};
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rcu_read_lock();
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ret = walk_tg_tree(tg_rt_schedulable, tg_nop, &data);
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rcu_read_unlock();
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return ret;
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}
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static int tg_set_rt_bandwidth(struct task_group *tg,
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u64 rt_period, u64 rt_runtime)
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{
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int i, err = 0;
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/*
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* Disallowing the root group RT runtime is BAD, it would disallow the
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* kernel creating (and or operating) RT threads.
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*/
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if (tg == &root_task_group && rt_runtime == 0)
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return -EINVAL;
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/* No period doesn't make any sense. */
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if (rt_period == 0)
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return -EINVAL;
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mutex_lock(&rt_constraints_mutex);
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read_lock(&tasklist_lock);
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err = __rt_schedulable(tg, rt_period, rt_runtime);
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if (err)
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goto unlock;
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raw_spin_lock_irq(&tg->rt_bandwidth.rt_runtime_lock);
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tg->rt_bandwidth.rt_period = ns_to_ktime(rt_period);
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tg->rt_bandwidth.rt_runtime = rt_runtime;
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for_each_possible_cpu(i) {
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struct rt_rq *rt_rq = tg->rt_rq[i];
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raw_spin_lock(&rt_rq->rt_runtime_lock);
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rt_rq->rt_runtime = rt_runtime;
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raw_spin_unlock(&rt_rq->rt_runtime_lock);
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}
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raw_spin_unlock_irq(&tg->rt_bandwidth.rt_runtime_lock);
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unlock:
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read_unlock(&tasklist_lock);
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mutex_unlock(&rt_constraints_mutex);
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return err;
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}
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static int sched_group_set_rt_runtime(struct task_group *tg, long rt_runtime_us)
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{
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u64 rt_runtime, rt_period;
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rt_period = ktime_to_ns(tg->rt_bandwidth.rt_period);
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rt_runtime = (u64)rt_runtime_us * NSEC_PER_USEC;
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if (rt_runtime_us < 0)
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rt_runtime = RUNTIME_INF;
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return tg_set_rt_bandwidth(tg, rt_period, rt_runtime);
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}
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static long sched_group_rt_runtime(struct task_group *tg)
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{
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u64 rt_runtime_us;
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if (tg->rt_bandwidth.rt_runtime == RUNTIME_INF)
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return -1;
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rt_runtime_us = tg->rt_bandwidth.rt_runtime;
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do_div(rt_runtime_us, NSEC_PER_USEC);
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return rt_runtime_us;
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}
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static int sched_group_set_rt_period(struct task_group *tg, u64 rt_period_us)
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{
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u64 rt_runtime, rt_period;
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rt_period = rt_period_us * NSEC_PER_USEC;
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rt_runtime = tg->rt_bandwidth.rt_runtime;
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return tg_set_rt_bandwidth(tg, rt_period, rt_runtime);
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}
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static long sched_group_rt_period(struct task_group *tg)
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{
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u64 rt_period_us;
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rt_period_us = ktime_to_ns(tg->rt_bandwidth.rt_period);
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do_div(rt_period_us, NSEC_PER_USEC);
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return rt_period_us;
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}
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#endif /* CONFIG_RT_GROUP_SCHED */
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#ifdef CONFIG_RT_GROUP_SCHED
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static int sched_rt_global_constraints(void)
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{
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int ret = 0;
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mutex_lock(&rt_constraints_mutex);
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read_lock(&tasklist_lock);
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ret = __rt_schedulable(NULL, 0, 0);
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read_unlock(&tasklist_lock);
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mutex_unlock(&rt_constraints_mutex);
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return ret;
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}
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static int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk)
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{
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/* Don't accept realtime tasks when there is no way for them to run */
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if (rt_task(tsk) && tg->rt_bandwidth.rt_runtime == 0)
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return 0;
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return 1;
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}
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#else /* !CONFIG_RT_GROUP_SCHED */
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static int sched_rt_global_constraints(void)
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{
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unsigned long flags;
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int i;
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raw_spin_lock_irqsave(&def_rt_bandwidth.rt_runtime_lock, flags);
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for_each_possible_cpu(i) {
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struct rt_rq *rt_rq = &cpu_rq(i)->rt;
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raw_spin_lock(&rt_rq->rt_runtime_lock);
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rt_rq->rt_runtime = global_rt_runtime();
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raw_spin_unlock(&rt_rq->rt_runtime_lock);
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}
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raw_spin_unlock_irqrestore(&def_rt_bandwidth.rt_runtime_lock, flags);
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return 0;
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}
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#endif /* CONFIG_RT_GROUP_SCHED */
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static int sched_rt_global_validate(void)
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{
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if (sysctl_sched_rt_period <= 0)
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return -EINVAL;
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if ((sysctl_sched_rt_runtime != RUNTIME_INF) &&
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(sysctl_sched_rt_runtime > sysctl_sched_rt_period))
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return -EINVAL;
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return 0;
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}
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static void sched_rt_do_global(void)
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{
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def_rt_bandwidth.rt_runtime = global_rt_runtime();
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def_rt_bandwidth.rt_period = ns_to_ktime(global_rt_period());
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}
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int sched_rt_handler(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp,
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loff_t *ppos)
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{
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int old_period, old_runtime;
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static DEFINE_MUTEX(mutex);
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int ret;
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mutex_lock(&mutex);
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old_period = sysctl_sched_rt_period;
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old_runtime = sysctl_sched_rt_runtime;
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ret = proc_dointvec(table, write, buffer, lenp, ppos);
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if (!ret && write) {
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ret = sched_rt_global_validate();
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if (ret)
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goto undo;
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ret = sched_dl_global_validate();
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if (ret)
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goto undo;
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ret = sched_rt_global_constraints();
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if (ret)
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goto undo;
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sched_rt_do_global();
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sched_dl_do_global();
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}
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if (0) {
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undo:
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sysctl_sched_rt_period = old_period;
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sysctl_sched_rt_runtime = old_runtime;
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}
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mutex_unlock(&mutex);
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return ret;
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}
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int sched_rr_handler(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp,
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loff_t *ppos)
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{
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int ret;
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static DEFINE_MUTEX(mutex);
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mutex_lock(&mutex);
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ret = proc_dointvec(table, write, buffer, lenp, ppos);
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/*
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* Make sure that internally we keep jiffies.
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* Also, writing zero resets the timeslice to default:
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*/
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if (!ret && write) {
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sched_rr_timeslice =
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sysctl_sched_rr_timeslice <= 0 ? RR_TIMESLICE :
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msecs_to_jiffies(sysctl_sched_rr_timeslice);
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}
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mutex_unlock(&mutex);
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return ret;
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}
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#ifdef CONFIG_CGROUP_SCHED
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static inline struct task_group *css_tg(struct cgroup_subsys_state *css)
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{
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@ -2449,6 +2449,316 @@ const struct sched_class rt_sched_class = {
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.update_curr = update_curr_rt,
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};
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#ifdef CONFIG_RT_GROUP_SCHED
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/*
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* Ensure that the real time constraints are schedulable.
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*/
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static DEFINE_MUTEX(rt_constraints_mutex);
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/* Must be called with tasklist_lock held */
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static inline int tg_has_rt_tasks(struct task_group *tg)
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{
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struct task_struct *g, *p;
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/*
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* Autogroups do not have RT tasks; see autogroup_create().
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*/
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if (task_group_is_autogroup(tg))
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return 0;
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for_each_process_thread(g, p) {
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if (rt_task(p) && task_group(p) == tg)
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return 1;
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}
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return 0;
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}
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struct rt_schedulable_data {
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struct task_group *tg;
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u64 rt_period;
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u64 rt_runtime;
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};
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static int tg_rt_schedulable(struct task_group *tg, void *data)
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{
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struct rt_schedulable_data *d = data;
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struct task_group *child;
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unsigned long total, sum = 0;
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u64 period, runtime;
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period = ktime_to_ns(tg->rt_bandwidth.rt_period);
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runtime = tg->rt_bandwidth.rt_runtime;
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if (tg == d->tg) {
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period = d->rt_period;
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runtime = d->rt_runtime;
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}
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/*
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* Cannot have more runtime than the period.
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*/
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if (runtime > period && runtime != RUNTIME_INF)
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return -EINVAL;
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/*
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* Ensure we don't starve existing RT tasks.
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*/
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if (rt_bandwidth_enabled() && !runtime && tg_has_rt_tasks(tg))
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return -EBUSY;
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total = to_ratio(period, runtime);
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/*
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* Nobody can have more than the global setting allows.
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*/
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if (total > to_ratio(global_rt_period(), global_rt_runtime()))
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return -EINVAL;
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/*
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* The sum of our children's runtime should not exceed our own.
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*/
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list_for_each_entry_rcu(child, &tg->children, siblings) {
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period = ktime_to_ns(child->rt_bandwidth.rt_period);
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runtime = child->rt_bandwidth.rt_runtime;
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if (child == d->tg) {
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period = d->rt_period;
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runtime = d->rt_runtime;
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}
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sum += to_ratio(period, runtime);
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}
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if (sum > total)
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return -EINVAL;
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return 0;
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}
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static int __rt_schedulable(struct task_group *tg, u64 period, u64 runtime)
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{
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int ret;
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struct rt_schedulable_data data = {
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.tg = tg,
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.rt_period = period,
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.rt_runtime = runtime,
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};
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rcu_read_lock();
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ret = walk_tg_tree(tg_rt_schedulable, tg_nop, &data);
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rcu_read_unlock();
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return ret;
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}
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static int tg_set_rt_bandwidth(struct task_group *tg,
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u64 rt_period, u64 rt_runtime)
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{
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int i, err = 0;
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|
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/*
|
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* Disallowing the root group RT runtime is BAD, it would disallow the
|
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* kernel creating (and or operating) RT threads.
|
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*/
|
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if (tg == &root_task_group && rt_runtime == 0)
|
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return -EINVAL;
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/* No period doesn't make any sense. */
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if (rt_period == 0)
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return -EINVAL;
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mutex_lock(&rt_constraints_mutex);
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read_lock(&tasklist_lock);
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err = __rt_schedulable(tg, rt_period, rt_runtime);
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if (err)
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goto unlock;
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raw_spin_lock_irq(&tg->rt_bandwidth.rt_runtime_lock);
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tg->rt_bandwidth.rt_period = ns_to_ktime(rt_period);
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tg->rt_bandwidth.rt_runtime = rt_runtime;
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for_each_possible_cpu(i) {
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struct rt_rq *rt_rq = tg->rt_rq[i];
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raw_spin_lock(&rt_rq->rt_runtime_lock);
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rt_rq->rt_runtime = rt_runtime;
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raw_spin_unlock(&rt_rq->rt_runtime_lock);
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}
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raw_spin_unlock_irq(&tg->rt_bandwidth.rt_runtime_lock);
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unlock:
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read_unlock(&tasklist_lock);
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mutex_unlock(&rt_constraints_mutex);
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return err;
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}
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int sched_group_set_rt_runtime(struct task_group *tg, long rt_runtime_us)
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{
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u64 rt_runtime, rt_period;
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rt_period = ktime_to_ns(tg->rt_bandwidth.rt_period);
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rt_runtime = (u64)rt_runtime_us * NSEC_PER_USEC;
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if (rt_runtime_us < 0)
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rt_runtime = RUNTIME_INF;
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return tg_set_rt_bandwidth(tg, rt_period, rt_runtime);
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}
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long sched_group_rt_runtime(struct task_group *tg)
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{
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u64 rt_runtime_us;
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if (tg->rt_bandwidth.rt_runtime == RUNTIME_INF)
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return -1;
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rt_runtime_us = tg->rt_bandwidth.rt_runtime;
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do_div(rt_runtime_us, NSEC_PER_USEC);
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return rt_runtime_us;
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}
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int sched_group_set_rt_period(struct task_group *tg, u64 rt_period_us)
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{
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u64 rt_runtime, rt_period;
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rt_period = rt_period_us * NSEC_PER_USEC;
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rt_runtime = tg->rt_bandwidth.rt_runtime;
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|
||||
return tg_set_rt_bandwidth(tg, rt_period, rt_runtime);
|
||||
}
|
||||
|
||||
long sched_group_rt_period(struct task_group *tg)
|
||||
{
|
||||
u64 rt_period_us;
|
||||
|
||||
rt_period_us = ktime_to_ns(tg->rt_bandwidth.rt_period);
|
||||
do_div(rt_period_us, NSEC_PER_USEC);
|
||||
return rt_period_us;
|
||||
}
|
||||
|
||||
static int sched_rt_global_constraints(void)
|
||||
{
|
||||
int ret = 0;
|
||||
|
||||
mutex_lock(&rt_constraints_mutex);
|
||||
read_lock(&tasklist_lock);
|
||||
ret = __rt_schedulable(NULL, 0, 0);
|
||||
read_unlock(&tasklist_lock);
|
||||
mutex_unlock(&rt_constraints_mutex);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk)
|
||||
{
|
||||
/* Don't accept realtime tasks when there is no way for them to run */
|
||||
if (rt_task(tsk) && tg->rt_bandwidth.rt_runtime == 0)
|
||||
return 0;
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
#else /* !CONFIG_RT_GROUP_SCHED */
|
||||
static int sched_rt_global_constraints(void)
|
||||
{
|
||||
unsigned long flags;
|
||||
int i;
|
||||
|
||||
raw_spin_lock_irqsave(&def_rt_bandwidth.rt_runtime_lock, flags);
|
||||
for_each_possible_cpu(i) {
|
||||
struct rt_rq *rt_rq = &cpu_rq(i)->rt;
|
||||
|
||||
raw_spin_lock(&rt_rq->rt_runtime_lock);
|
||||
rt_rq->rt_runtime = global_rt_runtime();
|
||||
raw_spin_unlock(&rt_rq->rt_runtime_lock);
|
||||
}
|
||||
raw_spin_unlock_irqrestore(&def_rt_bandwidth.rt_runtime_lock, flags);
|
||||
|
||||
return 0;
|
||||
}
|
||||
#endif /* CONFIG_RT_GROUP_SCHED */
|
||||
|
||||
static int sched_rt_global_validate(void)
|
||||
{
|
||||
if (sysctl_sched_rt_period <= 0)
|
||||
return -EINVAL;
|
||||
|
||||
if ((sysctl_sched_rt_runtime != RUNTIME_INF) &&
|
||||
(sysctl_sched_rt_runtime > sysctl_sched_rt_period))
|
||||
return -EINVAL;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void sched_rt_do_global(void)
|
||||
{
|
||||
def_rt_bandwidth.rt_runtime = global_rt_runtime();
|
||||
def_rt_bandwidth.rt_period = ns_to_ktime(global_rt_period());
|
||||
}
|
||||
|
||||
int sched_rt_handler(struct ctl_table *table, int write,
|
||||
void __user *buffer, size_t *lenp,
|
||||
loff_t *ppos)
|
||||
{
|
||||
int old_period, old_runtime;
|
||||
static DEFINE_MUTEX(mutex);
|
||||
int ret;
|
||||
|
||||
mutex_lock(&mutex);
|
||||
old_period = sysctl_sched_rt_period;
|
||||
old_runtime = sysctl_sched_rt_runtime;
|
||||
|
||||
ret = proc_dointvec(table, write, buffer, lenp, ppos);
|
||||
|
||||
if (!ret && write) {
|
||||
ret = sched_rt_global_validate();
|
||||
if (ret)
|
||||
goto undo;
|
||||
|
||||
ret = sched_dl_global_validate();
|
||||
if (ret)
|
||||
goto undo;
|
||||
|
||||
ret = sched_rt_global_constraints();
|
||||
if (ret)
|
||||
goto undo;
|
||||
|
||||
sched_rt_do_global();
|
||||
sched_dl_do_global();
|
||||
}
|
||||
if (0) {
|
||||
undo:
|
||||
sysctl_sched_rt_period = old_period;
|
||||
sysctl_sched_rt_runtime = old_runtime;
|
||||
}
|
||||
mutex_unlock(&mutex);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
int sched_rr_handler(struct ctl_table *table, int write,
|
||||
void __user *buffer, size_t *lenp,
|
||||
loff_t *ppos)
|
||||
{
|
||||
int ret;
|
||||
static DEFINE_MUTEX(mutex);
|
||||
|
||||
mutex_lock(&mutex);
|
||||
ret = proc_dointvec(table, write, buffer, lenp, ppos);
|
||||
/*
|
||||
* Make sure that internally we keep jiffies.
|
||||
* Also, writing zero resets the timeslice to default:
|
||||
*/
|
||||
if (!ret && write) {
|
||||
sched_rr_timeslice =
|
||||
sysctl_sched_rr_timeslice <= 0 ? RR_TIMESLICE :
|
||||
msecs_to_jiffies(sysctl_sched_rr_timeslice);
|
||||
}
|
||||
mutex_unlock(&mutex);
|
||||
return ret;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_SCHED_DEBUG
|
||||
extern void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq);
|
||||
|
||||
|
|
|
|||
|
|
@ -383,6 +383,11 @@ extern int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent
|
|||
extern void init_tg_rt_entry(struct task_group *tg, struct rt_rq *rt_rq,
|
||||
struct sched_rt_entity *rt_se, int cpu,
|
||||
struct sched_rt_entity *parent);
|
||||
extern int sched_group_set_rt_runtime(struct task_group *tg, long rt_runtime_us);
|
||||
extern int sched_group_set_rt_period(struct task_group *tg, u64 rt_period_us);
|
||||
extern long sched_group_rt_runtime(struct task_group *tg);
|
||||
extern long sched_group_rt_period(struct task_group *tg);
|
||||
extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk);
|
||||
|
||||
extern struct task_group *sched_create_group(struct task_group *parent);
|
||||
extern void sched_online_group(struct task_group *tg,
|
||||
|
|
|
|||
Loading…
Reference in New Issue