sched/fair: Defer calculation of 'prev_eff_load' in wake_affine_weight() until needed
On sync wakeups, the previous CPU effective load may not be used so delay the calculation until it's needed. 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/20180213133730.24064-3-mgorman@techsingularity.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -5724,7 +5724,6 @@ wake_affine_weight(struct sched_domain *sd, struct task_struct *p,
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unsigned long task_load;
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this_eff_load = target_load(this_cpu, sd->wake_idx);
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prev_eff_load = source_load(prev_cpu, sd->wake_idx);
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if (sync) {
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unsigned long current_load = task_h_load(current);
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@ -5742,6 +5741,7 @@ wake_affine_weight(struct sched_domain *sd, struct task_struct *p,
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this_eff_load *= 100;
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this_eff_load *= capacity_of(prev_cpu);
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prev_eff_load = source_load(prev_cpu, sd->wake_idx);
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prev_eff_load -= task_load;
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if (sched_feat(WA_BIAS))
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prev_eff_load *= 100 + (sd->imbalance_pct - 100) / 2;
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