Commit 56498cfb authored by Mel Gorman's avatar Mel Gorman Committed by Peter Zijlstra
Browse files

sched/fair: Avoid a second scan of target in select_idle_cpu 



When select_idle_cpu starts scanning for an idle CPU, it starts with
a target CPU that has already been checked by select_idle_sibling.
This patch starts with the next CPU instead.

Signed-off-by: default avatarMel Gorman <mgorman@techsingularity.net>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20210804115857.6253-3-mgorman@techsingularity.net
parent 89aafd67

kernel/sched/fair.c

+1 −1
Original line number Diff line number Diff line
@@ -6220,7 +6220,7 @@ static int select_idle_cpu(struct task_struct *p, struct sched_domain *sd, bool 
		time = cpu_clock(this);

	}



	for_each_cpu_wrap(cpu, cpus, target) {

	for_each_cpu_wrap(cpu, cpus, target + 1) {

		if (has_idle_core) {

			i = select_idle_core(p, cpu, cpus, &idle_cpu);

			if ((unsigned int)i < nr_cpumask_bits)