sched/fair: Avoid an unnecessary lookup of current CPU ID during wake_affine
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> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Giovanni Gherdovich <ggherdovich@suse.cz> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Matt Fleming <matt@codeblueprint.co.uk> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20180213133730.24064-2-mgorman@techsingularity.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -5751,9 +5751,8 @@ wake_affine_weight(struct sched_domain *sd, struct task_struct *p,
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}
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}
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static int wake_affine(struct sched_domain *sd, struct task_struct *p,
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static int wake_affine(struct sched_domain *sd, struct task_struct *p,
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int prev_cpu, int sync)
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int this_cpu, int prev_cpu, int sync)
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{
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{
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int this_cpu = smp_processor_id();
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int target = nr_cpumask_bits;
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int target = nr_cpumask_bits;
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if (sched_feat(WA_IDLE))
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if (sched_feat(WA_IDLE))
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@ -6376,7 +6375,7 @@ select_task_rq_fair(struct task_struct *p, int prev_cpu, int sd_flag, int wake_f
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if (cpu == prev_cpu)
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if (cpu == prev_cpu)
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goto pick_cpu;
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goto pick_cpu;
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new_cpu = wake_affine(affine_sd, p, prev_cpu, sync);
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new_cpu = wake_affine(affine_sd, p, cpu, prev_cpu, sync);
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}
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}
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if (sd && !(sd_flag & SD_BALANCE_FORK)) {
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if (sd && !(sd_flag & SD_BALANCE_FORK)) {
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