From 56498cfb045d7147cdcba33795d19429afcd1d00 Mon Sep 17 00:00:00 2001 From: Mel Gorman Date: Wed, 4 Aug 2021 12:58:57 +0100 Subject: [PATCH] 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: Mel Gorman Signed-off-by: Peter Zijlstra (Intel) Link: https://lkml.kernel.org/r/20210804115857.6253-3-mgorman@techsingularity.net --- kernel/sched/fair.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 7ee394b4b4cd..47a0fbf224b2 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -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) -- 2.20.1