---

yaml
---
r: 277389
b: refs/heads/master
c: 786d6dc
h: refs/heads/master
i:
  277387: d8c3892
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 0b005cf54eac170a8f22540ab096a6e07bf49e7c
+refs/heads/master: 786d6dc7aeb2bfbfe417507b7beb83919f319db3

trunk/kernel/sched/fair.c

@@ -4733,7 +4733,6 @@ static int active_load_balance_cpu_stop(void *data)
  */
 static struct {
 	cpumask_var_t idle_cpus_mask;
-	cpumask_var_t grp_idle_mask;
 	atomic_t nr_cpus;
 	unsigned long next_balance;     /* in jiffy units */
 } nohz ____cacheline_aligned;
@@ -4773,33 +4772,6 @@ static inline struct sched_domain *lowest_flag_domain(int cpu, int flag)
 	for (sd = lowest_flag_domain(cpu, flag); \
 		(sd && (sd->flags & flag)); sd = sd->parent)
 
-/**
- * is_semi_idle_group - Checks if the given sched_group is semi-idle.
- * @ilb_group:	group to be checked for semi-idleness
- *
- * Returns:	1 if the group is semi-idle. 0 otherwise.
- *
- * We define a sched_group to be semi idle if it has atleast one idle-CPU
- * and atleast one non-idle CPU. This helper function checks if the given
- * sched_group is semi-idle or not.
- */
-static inline int is_semi_idle_group(struct sched_group *ilb_group)
-{
-	cpumask_and(nohz.grp_idle_mask, nohz.idle_cpus_mask,
-					sched_group_cpus(ilb_group));
-
-	/*
-	 * A sched_group is semi-idle when it has atleast one busy cpu
-	 * and atleast one idle cpu.
-	 */
-	if (cpumask_empty(nohz.grp_idle_mask))
-		return 0;
-
-	if (cpumask_equal(nohz.grp_idle_mask, sched_group_cpus(ilb_group)))
-		return 0;
-
-	return 1;
-}
 /**
  * find_new_ilb - Finds the optimum idle load balancer for nomination.
  * @cpu:	The cpu which is nominating a new idle_load_balancer.
@@ -4815,8 +4787,8 @@ static inline int is_semi_idle_group(struct sched_group *ilb_group)
 static int find_new_ilb(int cpu)
 {
 	int ilb = cpumask_first(nohz.idle_cpus_mask);
+	struct sched_group *ilbg;
 	struct sched_domain *sd;
-	struct sched_group *ilb_group;
 
 	/*
 	 * Have idle load balancer selection from semi-idle packages only
@@ -4834,23 +4806,28 @@ static int find_new_ilb(int cpu)
 
 	rcu_read_lock();
 	for_each_flag_domain(cpu, sd, SD_POWERSAVINGS_BALANCE) {
-		ilb_group = sd->groups;
+		ilbg = sd->groups;
 
 		do {
-			if (is_semi_idle_group(ilb_group)) {
-				ilb = cpumask_first(nohz.grp_idle_mask);
+			if (ilbg->group_weight !=
+				atomic_read(&ilbg->sgp->nr_busy_cpus)) {
+				ilb = cpumask_first_and(nohz.idle_cpus_mask,
+							sched_group_cpus(ilbg));
 				goto unlock;
 			}
 
-			ilb_group = ilb_group->next;
+			ilbg = ilbg->next;
 
-		} while (ilb_group != sd->groups);
+		} while (ilbg != sd->groups);
 	}
 unlock:
 	rcu_read_unlock();
 
 out_done:
-	return ilb;
+	if (ilb < nr_cpu_ids && idle_cpu(ilb))
+		return ilb;
+
+	return nr_cpu_ids;
 }
 #else /*  (CONFIG_SCHED_MC || CONFIG_SCHED_SMT) */
 static inline int find_new_ilb(int call_cpu)
@@ -5588,7 +5565,6 @@ __init void init_sched_fair_class(void)
 
 #ifdef CONFIG_NO_HZ
 	zalloc_cpumask_var(&nohz.idle_cpus_mask, GFP_NOWAIT);
-	alloc_cpumask_var(&nohz.grp_idle_mask, GFP_NOWAIT);
 #endif
 #endif /* SMP */