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Subject[PATCH 1/6] sched/fair: Avoid an unnecessary lookup of current CPU ID during wake_affine
Date
The only caller of wake_affine() knows the CPU ID. Pass it in instead of
rechecking it.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
kernel/sched/fair.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 5eb3ffc9be84..4b3e86eb2222 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5751,9 +5751,8 @@ wake_affine_weight(struct sched_domain *sd, struct task_struct *p,
}

static int wake_affine(struct sched_domain *sd, struct task_struct *p,
- int prev_cpu, int sync)
+ int this_cpu, int prev_cpu, int sync)
{
- int this_cpu = smp_processor_id();
int target = nr_cpumask_bits;

if (sched_feat(WA_IDLE))
@@ -6376,7 +6375,7 @@ select_task_rq_fair(struct task_struct *p, int prev_cpu, int sd_flag, int wake_f
if (cpu == prev_cpu)
goto pick_cpu;

- new_cpu = wake_affine(affine_sd, p, prev_cpu, sync);
+ new_cpu = wake_affine(affine_sd, p, cpu, prev_cpu, sync);
}

if (sd && !(sd_flag & SD_BALANCE_FORK)) {
--
2.15.1
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