From f32d782e31bf079f600dcec126ed117b0577e85c Mon Sep 17 00:00:00 2001 From: Lauro Ramos Venancio Date: Thu, 20 Apr 2017 16:51:40 -0300 Subject: [PATCH] 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 Signed-off-by: Peter Zijlstra (Intel) Cc: Linus Torvalds Cc: Mike Galbraith Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: lwang@redhat.com Cc: riel@redhat.com Link: http://lkml.kernel.org/r/1492717903-5195-2-git-send-email-lvenanci@redhat.com Signed-off-by: Ingo Molnar --- 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 81c82031ed95..5a4d9aeda258 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;