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-rw-r--r--kernel/sched.c22
1 files changed, 17 insertions, 5 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 14a8d9050cd4..0a3e748d737d 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -227,6 +227,7 @@ struct rq {
227 unsigned long expired_timestamp; 227 unsigned long expired_timestamp;
228 unsigned long long timestamp_last_tick; 228 unsigned long long timestamp_last_tick;
229 struct task_struct *curr, *idle; 229 struct task_struct *curr, *idle;
230 unsigned long next_balance;
230 struct mm_struct *prev_mm; 231 struct mm_struct *prev_mm;
231 struct prio_array *active, *expired, arrays[2]; 232 struct prio_array *active, *expired, arrays[2];
232 int best_expired_prio; 233 int best_expired_prio;
@@ -2858,7 +2859,7 @@ static void update_load(struct rq *this_rq)
2858} 2859}
2859 2860
2860/* 2861/*
2861 * rebalance_tick will get called every timer tick, on every CPU. 2862 * run_rebalance_domains is triggered when needed from the scheduler tick.
2862 * 2863 *
2863 * It checks each scheduling domain to see if it is due to be balanced, 2864 * It checks each scheduling domain to see if it is due to be balanced,
2864 * and initiates a balancing operation if so. 2865 * and initiates a balancing operation if so.
@@ -2866,9 +2867,10 @@ static void update_load(struct rq *this_rq)
2866 * Balancing parameters are set up in arch_init_sched_domains. 2867 * Balancing parameters are set up in arch_init_sched_domains.
2867 */ 2868 */
2868 2869
2869static void 2870static void run_rebalance_domains(struct softirq_action *h)
2870rebalance_tick(int this_cpu, struct rq *this_rq)
2871{ 2871{
2872 int this_cpu = smp_processor_id();
2873 struct rq *this_rq = cpu_rq(this_cpu);
2872 unsigned long interval; 2874 unsigned long interval;
2873 struct sched_domain *sd; 2875 struct sched_domain *sd;
2874 /* 2876 /*
@@ -2877,6 +2879,8 @@ rebalance_tick(int this_cpu, struct rq *this_rq)
2877 */ 2879 */
2878 enum idle_type idle = !this_rq->nr_running ? 2880 enum idle_type idle = !this_rq->nr_running ?
2879 SCHED_IDLE : NOT_IDLE; 2881 SCHED_IDLE : NOT_IDLE;
2882 /* Earliest time when we have to call run_rebalance_domains again */
2883 unsigned long next_balance = jiffies + 60*HZ;
2880 2884
2881 for_each_domain(this_cpu, sd) { 2885 for_each_domain(this_cpu, sd) {
2882 if (!(sd->flags & SD_LOAD_BALANCE)) 2886 if (!(sd->flags & SD_LOAD_BALANCE))
@@ -2891,7 +2895,7 @@ rebalance_tick(int this_cpu, struct rq *this_rq)
2891 if (unlikely(!interval)) 2895 if (unlikely(!interval))
2892 interval = 1; 2896 interval = 1;
2893 2897
2894 if (jiffies - sd->last_balance >= interval) { 2898 if (time_after_eq(jiffies, sd->last_balance + interval)) {
2895 if (load_balance(this_cpu, this_rq, sd, idle)) { 2899 if (load_balance(this_cpu, this_rq, sd, idle)) {
2896 /* 2900 /*
2897 * We've pulled tasks over so either we're no 2901 * We've pulled tasks over so either we're no
@@ -2902,7 +2906,10 @@ rebalance_tick(int this_cpu, struct rq *this_rq)
2902 } 2906 }
2903 sd->last_balance += interval; 2907 sd->last_balance += interval;
2904 } 2908 }
2909 if (time_after(next_balance, sd->last_balance + interval))
2910 next_balance = sd->last_balance + interval;
2905 } 2911 }
2912 this_rq->next_balance = next_balance;
2906} 2913}
2907#else 2914#else
2908/* 2915/*
@@ -3155,7 +3162,8 @@ void scheduler_tick(void)
3155 task_running_tick(rq, p); 3162 task_running_tick(rq, p);
3156#ifdef CONFIG_SMP 3163#ifdef CONFIG_SMP
3157 update_load(rq); 3164 update_load(rq);
3158 rebalance_tick(cpu, rq); 3165 if (time_after_eq(jiffies, rq->next_balance))
3166 raise_softirq(SCHED_SOFTIRQ);
3159#endif 3167#endif
3160} 3168}
3161 3169
@@ -6859,6 +6867,10 @@ void __init sched_init(void)
6859 6867
6860 set_load_weight(&init_task); 6868 set_load_weight(&init_task);
6861 6869
6870#ifdef CONFIG_SMP
6871 open_softirq(SCHED_SOFTIRQ, run_rebalance_domains, NULL);
6872#endif
6873
6862#ifdef CONFIG_RT_MUTEXES 6874#ifdef CONFIG_RT_MUTEXES
6863 plist_head_init(&init_task.pi_waiters, &init_task.pi_lock); 6875 plist_head_init(&init_task.pi_waiters, &init_task.pi_lock);
6864#endif 6876#endif