The following commit has been merged into the sched/core branch of tip:
Commit-ID: 56498cfb045d7147cdcba33795d19429afcd1d00
Gitweb: https://git.kernel.org/tip/56498cfb045d7147cdcba33795d19429afcd1d00
Author: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
AuthorDate: Wed, 04 Aug 2021 12:58:57 +01:00
Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Wed, 04 Aug 2021 15:16:44 +02:00
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 <mgorman@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Link: https://lkml.kernel.org/r/20210804115857.6253-3-mgorman@xxxxxxxxxxxxxxxxxxx
---
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 7ee394b..47a0fbf 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)
|