[PATCH 07/10] sched, fair: Optimize find_busiest_queue()

[Peter Zijlstra]

Use for_each_cpu_and() and thereby avoid computing the capacity for
CPUs we know we're not interested in.

Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
---
 kernel/sched/fair.c |    5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4977,7 +4977,7 @@ static struct rq *find_busiest_queue(str
 	unsigned long busiest_load = 0, busiest_power = SCHED_POWER_SCALE;
 	int i;
 
-	for_each_cpu(i, sched_group_cpus(group)) {
+	for_each_cpu_and(i, sched_group_cpus(group), env->cpus) {
 		unsigned long power = power_of(i);
 		unsigned long capacity = DIV_ROUND_CLOSEST(power,
 							   SCHED_POWER_SCALE);
@@ -4986,9 +4986,6 @@ static struct rq *find_busiest_queue(str
 		if (!capacity)
 			capacity = fix_small_capacity(env->sd, group);
 
-		if (!cpumask_test_cpu(i, env->cpus))
-			continue;
-
 		rq = cpu_rq(i);
 		wl = weighted_cpuload(i);
 


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