[PATCH 1/6] sched/fair: Avoid an unnecessary lookup of current CPU ID during wake_affine

[Mel Gorman]

The only caller of wake_affine() knows the CPU ID. Pass it in instead of
rechecking it.

Signed-off-by: Mel Gorman <mgor...@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