2 files changed, 38 insertions, 26 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index 34b7d721d73..35ef06c9921 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -365,6 +365,13 @@ struct root_domain {
         atomic_t refcount;
         cpumask_t span;
         cpumask_t online;
+
+        /*
+         * The "RT overload" flag: it gets set if a CPU has more than
+         * one runnable RT task.
+         */
+        cpumask_t rto_mask;
+        atomic_t  rto_count;
 };
 
 static struct root_domain def_root_domain;
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 4d0a60e47df..b049e5110ee 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -5,22 +5,14 @@
 
 #ifdef CONFIG_SMP
 
-/*
- * The "RT overload" flag: it gets set if a CPU has more than
- * one runnable RT task.
- */
-static cpumask_t rt_overload_mask;
-static atomic_t rto_count;
-
-static inline int rt_overloaded(void)
+static inline int rt_overloaded(struct rq *rq)
 {
-        return atomic_read(&rto_count);
+        return atomic_read(&rq->rd->rto_count);
 }
 
 static inline void rt_set_overload(struct rq *rq)
 {
-        rq->rt.overloaded = 1;
-        cpu_set(rq->cpu, rt_overload_mask);
+        cpu_set(rq->cpu, rq->rd->rto_mask);
         /*
          * Make sure the mask is visible before we set
          * the overload count. That is checked to determine
@@ -29,23 +21,25 @@ static inline void rt_set_overload(struct rq *rq)
          * updated yet.
          */
         wmb();
-        atomic_inc(&rto_count);
+        atomic_inc(&rq->rd->rto_count);
 }
 
 static inline void rt_clear_overload(struct rq *rq)
 {
         /* the order here really doesn't matter */
-        atomic_dec(&rto_count);
-        cpu_clear(rq->cpu, rt_overload_mask);
-        rq->rt.overloaded = 0;
+        atomic_dec(&rq->rd->rto_count);
+        cpu_clear(rq->cpu, rq->rd->rto_mask);
 }
 
 static void update_rt_migration(struct rq *rq)
 {
-        if (rq->rt.rt_nr_migratory && (rq->rt.rt_nr_running > 1))
+        if (rq->rt.rt_nr_migratory && (rq->rt.rt_nr_running > 1)) {
                 rt_set_overload(rq);
-        else
+                rq->rt.overloaded = 1;
+        } else {
                 rt_clear_overload(rq);
+                rq->rt.overloaded = 0;
+        }
 }
 #endif /* CONFIG_SMP */
 
@@ -306,7 +300,7 @@ static int find_lowest_cpus(struct task_struct *task, cpumask_t *lowest_mask)
         int       count       = 0;
         int       cpu;
 
-        cpus_and(*lowest_mask, cpu_online_map, task->cpus_allowed);
+        cpus_and(*lowest_mask, task_rq(task)->rd->online, task->cpus_allowed);
 
         /*
          * Scan each rq for the lowest prio.
@@ -580,18 +574,12 @@ static int pull_rt_task(struct rq *this_rq)
         struct task_struct *p, *next;
         struct rq *src_rq;
 
-        /*
-         * If cpusets are used, and we have overlapping
-         * run queue cpusets, then this algorithm may not catch all.
-         * This is just the price you pay on trying to keep
-         * dirtying caches down on large SMP machines.
-         */
-        if (likely(!rt_overloaded()))
+        if (likely(!rt_overloaded(this_rq)))
                 return 0;
 
         next = pick_next_task_rt(this_rq);
 
-        for_each_cpu_mask(cpu, rt_overload_mask) {
+        for_each_cpu_mask(cpu, this_rq->rd->rto_mask) {
                 if (this_cpu == cpu)
                         continue;
 
@@ -811,6 +799,20 @@ static void task_tick_rt(struct rq *rq, struct task_struct *p)
         }
 }
 
+/* Assumes rq->lock is held */
+static void join_domain_rt(struct rq *rq)
+{
+        if (rq->rt.overloaded)
+                rt_set_overload(rq);
+}
+
+/* Assumes rq->lock is held */
+static void leave_domain_rt(struct rq *rq)
+{
+        if (rq->rt.overloaded)
+                rt_clear_overload(rq);
+}
+
 static void set_curr_task_rt(struct rq *rq)
 {
         struct task_struct *p = rq->curr;
@@ -840,4 +842,7 @@ const struct sched_class rt_sched_class = {
 
         .set_curr_task          = set_curr_task_rt,
         .task_tick              = task_tick_rt,
+
+        .join_domain            = join_domain_rt,
+        .leave_domain           = leave_domain_rt,
 };