linux-kernel - [PATCH 1/4] sched/topology: optimize build_group

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Date:   Thu, 20 Apr 2017 16:51:40 -0300
From:   Lauro Ramos Venancio <lvenanci@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     lwang@...hat.com, riel@...hat.com, Mike Galbraith <efault@....de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
        Lauro Ramos Venancio <lvenanci@...hat.com>
Subject: [PATCH 1/4] sched/topology: optimize build_group_mask()

The group mask is always used in intersection with the group cpus. So,
when building the group mask, we don't have to care about cpus that are
not part of the group.

Signed-off-by: Lauro Ramos Venancio <lvenanci@...hat.com>
---
 kernel/sched/topology.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index 9d4566c..f8b53b3 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -506,12 +506,12 @@ enum s_alloc {
  */
 static void build_group_mask(struct sched_domain *sd, struct sched_group *sg)
 {
-	const struct cpumask *span = sched_domain_span(sd);
+	const struct cpumask *sg_span = sched_group_cpus(sg);
 	struct sd_data *sdd = sd->private;
 	struct sched_domain *sibling;
 	int i;
 
-	for_each_cpu(i, span) {
+	for_each_cpu(i, sg_span) {
 		sibling = *per_cpu_ptr(sdd->sd, i);
 		if (!cpumask_test_cpu(i, sched_domain_span(sibling)))
 			continue;
-- 
1.8.3.1