Merge branch 'sched/urgent' into sched/core

[~andy/linux] / kernel / sched / core.c

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 36f85be2932b38df8b0b0bf7d71cf81606dce56c..d8f071cc9f5190dc38e76c9fba6df4aa31d77978 100644 (file)
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -633,7 +633,19 @@ void wake_up_nohz_cpu(int cpu)
 static inline bool got_nohz_idle_kick(void)
 {
        int cpu = smp_processor_id();
-       return idle_cpu(cpu) && test_bit(NOHZ_BALANCE_KICK, nohz_flags(cpu));
+
+       if (!test_bit(NOHZ_BALANCE_KICK, nohz_flags(cpu)))
+               return false;
+
+       if (idle_cpu(cpu) && !need_resched())
+               return true;
+
+       /*
+        * We can't run Idle Load Balance on this CPU for this time so we
+        * cancel it and clear NOHZ_BALANCE_KICK
+        */
+       clear_bit(NOHZ_BALANCE_KICK, nohz_flags(cpu));
+       return false;
 }
 
 #else /* CONFIG_NO_HZ_COMMON */
@@ -1395,8 +1407,9 @@ static void sched_ttwu_pending(void)
 
 void scheduler_ipi(void)
 {
-       if (llist_empty(&this_rq()->wake_list) && !got_nohz_idle_kick()
-           && !tick_nohz_full_cpu(smp_processor_id()))
+       if (llist_empty(&this_rq()->wake_list)
+                       && !tick_nohz_full_cpu(smp_processor_id())
+                       && !got_nohz_idle_kick())
                return;
 
        /*
@@ -1419,7 +1432,7 @@ void scheduler_ipi(void)
        /*
         * Check if someone kicked us for doing the nohz idle load balance.
         */
-       if (unlikely(got_nohz_idle_kick() && !need_resched())) {
+       if (unlikely(got_nohz_idle_kick())) {
                this_rq()->idle_balance = 1;
                raise_softirq_irqoff(SCHED_SOFTIRQ);
        }