sched: rt-group: smp balancing

Currently the rt group scheduling does a per cpu runtime limit, however
the rt load balancer makes no guarantees about an equal spread of real-
time tasks, just that at any one time, the highest priority tasks run.

Solve this by making the runtime limit a global property by borrowing
excessive runtime from the other cpus once the local limit runs out.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 122 insertions, 6 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index bb20323f7d09..313cd4f057cf 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -164,6 +164,7 @@ struct rt_prio_array {
 struct rt_bandwidth {
         ktime_t rt_period;
         u64 rt_runtime;
+        spinlock_t rt_runtime_lock;
         struct hrtimer rt_period_timer;
 };
 
@@ -198,6 +199,8 @@ void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime)
         rt_b->rt_period = ns_to_ktime(period);
         rt_b->rt_runtime = runtime;
 
+        spin_lock_init(&rt_b->rt_runtime_lock);
+
         hrtimer_init(&rt_b->rt_period_timer,
                         CLOCK_MONOTONIC, HRTIMER_MODE_REL);
         rt_b->rt_period_timer.function = sched_rt_period_timer;
@@ -414,6 +417,8 @@ struct rt_rq {
 #endif
         int rt_throttled;
         u64 rt_time;
+        u64 rt_runtime;
+        spinlock_t rt_runtime_lock;
 
 #ifdef CONFIG_RT_GROUP_SCHED
         unsigned long rt_nr_boosted;
@@ -7299,6 +7304,8 @@ static void init_rt_rq(struct rt_rq *rt_rq, struct rq *rq)
 
         rt_rq->rt_time = 0;
         rt_rq->rt_throttled = 0;
+        rt_rq->rt_runtime = 0;
+        spin_lock_init(&rt_rq->rt_runtime_lock);
 
 #ifdef CONFIG_RT_GROUP_SCHED
         rt_rq->rt_nr_boosted = 0;
@@ -7335,6 +7342,7 @@ static void init_tg_rt_entry(struct rq *rq, struct task_group *tg,
         init_rt_rq(rt_rq, rq);
         rt_rq->tg = tg;
         rt_rq->rt_se = rt_se;
+        rt_rq->rt_runtime = tg->rt_bandwidth.rt_runtime;
         if (add)
                 list_add(&rt_rq->leaf_rt_rq_list, &rq->leaf_rt_rq_list);
 
@@ -7391,6 +7399,8 @@ void __init sched_init(void)
                 init_tg_rt_entry(rq, &init_task_group,
                                 &per_cpu(init_rt_rq, i),
                                 &per_cpu(init_sched_rt_entity, i), i, 1);
+#else
+                rq->rt.rt_runtime = def_rt_bandwidth.rt_runtime;
 #endif
 
                 for (j = 0; j < CPU_LOAD_IDX_MAX; j++)
@@ -7974,11 +7984,11 @@ static inline int tg_has_rt_tasks(struct task_group *tg)
 static int tg_set_bandwidth(struct task_group *tg,
                 u64 rt_period, u64 rt_runtime)
 {
-        int err = 0;
+        int i, err = 0;
 
         mutex_lock(&rt_constraints_mutex);
         read_lock(&tasklist_lock);
-        if (rt_runtime_us == 0 && tg_has_rt_tasks(tg)) {
+        if (rt_runtime == 0 && tg_has_rt_tasks(tg)) {
                 err = -EBUSY;
                 goto unlock;
         }
@@ -7986,8 +7996,19 @@ static int tg_set_bandwidth(struct task_group *tg,
                 err = -EINVAL;
                 goto unlock;
         }
+
+        spin_lock_irq(&tg->rt_bandwidth.rt_runtime_lock);
         tg->rt_bandwidth.rt_period = ns_to_ktime(rt_period);
         tg->rt_bandwidth.rt_runtime = rt_runtime;
+
+        for_each_possible_cpu(i) {
+                struct rt_rq *rt_rq = tg->rt_rq[i];
+
+                spin_lock(&rt_rq->rt_runtime_lock);
+                rt_rq->rt_runtime = rt_runtime;
+                spin_unlock(&rt_rq->rt_runtime_lock);
+        }
+        spin_unlock_irq(&tg->rt_bandwidth.rt_runtime_lock);
  unlock:
         read_unlock(&tasklist_lock);
         mutex_unlock(&rt_constraints_mutex);
@@ -8052,6 +8073,19 @@ static int sched_rt_global_constraints(void)
 #else
 static int sched_rt_global_constraints(void)
 {
+        unsigned long flags;
+        int i;
+
+        spin_lock_irqsave(&def_rt_bandwidth.rt_runtime_lock, flags);
+        for_each_possible_cpu(i) {
+                struct rt_rq *rt_rq = &cpu_rq(i)->rt;
+
+                spin_lock(&rt_rq->rt_runtime_lock);
+                rt_rq->rt_runtime = global_rt_runtime();
+                spin_unlock(&rt_rq->rt_runtime_lock);
+        }
+        spin_unlock_irqrestore(&def_rt_bandwidth.rt_runtime_lock, flags);
+
         return 0;
 }
 #endif
@@ -8168,7 +8202,7 @@ static u64 cpu_shares_read_uint(struct cgroup *cgrp, struct cftype *cft)
 #endif
 
 #ifdef CONFIG_RT_GROUP_SCHED
-static int cpu_rt_runtime_write(struct cgroup *cgrp, struct cftype *cft,
+static ssize_t cpu_rt_runtime_write(struct cgroup *cgrp, struct cftype *cft,
                                 struct file *file,
                                 const char __user *userbuf,
                                 size_t nbytes, loff_t *unused_ppos)
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 8bc176136666..6928ded24da1 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -62,7 +62,12 @@ static inline u64 sched_rt_runtime(struct rt_rq *rt_rq)
         if (!rt_rq->tg)
                 return RUNTIME_INF;
 
-        return rt_rq->tg->rt_bandwidth.rt_runtime;
+        return rt_rq->rt_runtime;
+}
+
+static inline u64 sched_rt_period(struct rt_rq *rt_rq)
+{
+        return ktime_to_ns(rt_rq->tg->rt_bandwidth.rt_period);
 }
 
 #define for_each_leaf_rt_rq(rt_rq, rq) \
@@ -145,11 +150,21 @@ struct rt_rq *sched_rt_period_rt_rq(struct rt_bandwidth *rt_b, int cpu)
         return container_of(rt_b, struct task_group, rt_bandwidth)->rt_rq[cpu];
 }
 
+static inline struct rt_bandwidth *sched_rt_bandwidth(struct rt_rq *rt_rq)
+{
+        return &rt_rq->tg->rt_bandwidth;
+}
+
 #else
 
 static inline u64 sched_rt_runtime(struct rt_rq *rt_rq)
 {
-        return def_rt_bandwidth.rt_runtime;
+        return rt_rq->rt_runtime;
+}
+
+static inline u64 sched_rt_period(struct rt_rq *rt_rq)
+{
+        return ktime_to_ns(def_rt_bandwidth.rt_period);
 }
 
 #define for_each_leaf_rt_rq(rt_rq, rq) \
@@ -200,6 +215,11 @@ struct rt_rq *sched_rt_period_rt_rq(struct rt_bandwidth *rt_b, int cpu)
         return &cpu_rq(cpu)->rt;
 }
 
+static inline struct rt_bandwidth *sched_rt_bandwidth(struct rt_rq *rt_rq)
+{
+        return &def_rt_bandwidth;
+}
+
 #endif
 
 static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun)
@@ -218,8 +238,10 @@ static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun)
 
                 spin_lock(&rq->lock);
                 if (rt_rq->rt_time) {
-                        u64 runtime = rt_b->rt_runtime;
+                        u64 runtime;
 
+                        spin_lock(&rt_rq->rt_runtime_lock);
+                        runtime = rt_rq->rt_runtime;
                         rt_rq->rt_time -= min(rt_rq->rt_time, overrun*runtime);
                         if (rt_rq->rt_throttled && rt_rq->rt_time < runtime) {
                                 rt_rq->rt_throttled = 0;
@@ -227,6 +249,7 @@ static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun)
                         }
                         if (rt_rq->rt_time || rt_rq->rt_nr_running)
                                 idle = 0;
+                        spin_unlock(&rt_rq->rt_runtime_lock);
                 }
 
                 if (enqueue)
@@ -237,6 +260,47 @@ static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun)
         return idle;
 }
 
+#ifdef CONFIG_SMP
+static int balance_runtime(struct rt_rq *rt_rq)
+{
+        struct rt_bandwidth *rt_b = sched_rt_bandwidth(rt_rq);
+        struct root_domain *rd = cpu_rq(smp_processor_id())->rd;
+        int i, weight, more = 0;
+        u64 rt_period;
+
+        weight = cpus_weight(rd->span);
+
+        spin_lock(&rt_b->rt_runtime_lock);
+        rt_period = ktime_to_ns(rt_b->rt_period);
+        for_each_cpu_mask(i, rd->span) {
+                struct rt_rq *iter = sched_rt_period_rt_rq(rt_b, i);
+                s64 diff;
+
+                if (iter == rt_rq)
+                        continue;
+
+                spin_lock(&iter->rt_runtime_lock);
+                diff = iter->rt_runtime - iter->rt_time;
+                if (diff > 0) {
+                        do_div(diff, weight);
+                        if (rt_rq->rt_runtime + diff > rt_period)
+                                diff = rt_period - rt_rq->rt_runtime;
+                        iter->rt_runtime -= diff;
+                        rt_rq->rt_runtime += diff;
+                        more = 1;
+                        if (rt_rq->rt_runtime == rt_period) {
+                                spin_unlock(&iter->rt_runtime_lock);
+                                break;
+                        }
+                }
+                spin_unlock(&iter->rt_runtime_lock);
+        }
+        spin_unlock(&rt_b->rt_runtime_lock);
+
+        return more;
+}
+#endif
+
 static inline int rt_se_prio(struct sched_rt_entity *rt_se)
 {
 #ifdef CONFIG_RT_GROUP_SCHED
@@ -259,6 +323,22 @@ static int sched_rt_runtime_exceeded(struct rt_rq *rt_rq)
         if (rt_rq->rt_throttled)
                 return rt_rq_throttled(rt_rq);
 
+        if (sched_rt_runtime(rt_rq) >= sched_rt_period(rt_rq))
+                return 0;
+
+#ifdef CONFIG_SMP
+        if (rt_rq->rt_time > runtime) {
+                int more;
+
+                spin_unlock(&rt_rq->rt_runtime_lock);
+                more = balance_runtime(rt_rq);
+                spin_lock(&rt_rq->rt_runtime_lock);
+
+                if (more)
+                        runtime = sched_rt_runtime(rt_rq);
+        }
+#endif
+
         if (rt_rq->rt_time > runtime) {
                 rt_rq->rt_throttled = 1;
                 if (rt_rq_throttled(rt_rq)) {
@@ -294,9 +374,11 @@ static void update_curr_rt(struct rq *rq)
         curr->se.exec_start = rq->clock;
         cpuacct_charge(curr, delta_exec);
 
+        spin_lock(&rt_rq->rt_runtime_lock);
         rt_rq->rt_time += delta_exec;
         if (sched_rt_runtime_exceeded(rt_rq))
                 resched_task(curr);
+        spin_unlock(&rt_rq->rt_runtime_lock);
 }
 
 static inline