Commit f32d782e authored Apr 20, 2017 by Lauro Ramos Venancio Committed by Ingo Molnar May 15, 2017

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@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
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 <mingo@kernel.org>

parent a420b063

kernel/sched/topology.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -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;

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