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

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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: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20210804115857.6253-3-mgorman@techsingularity.net
This commit is contained in:
Mel Gorman 2021-08-04 12:58:57 +01:00 committed by Peter Zijlstra
parent 89aafd67f2
commit 56498cfb04
1 changed files with 1 additions and 1 deletions
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kernel/sched/fair.c
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@ -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)