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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>
This commit is contained in:
Mel Gorman 2018-02-13 13:37:26 +00:00 committed by Ingo Molnar
parent 7ebb66a12f
commit eeb6039863
1 changed files with 1 additions and 1 deletions
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2
kernel/sched/fair.c
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@ -5724,7 +5724,6 @@ wake_affine_weight(struct sched_domain *sd, struct task_struct *p,
unsigned long task_load;
this_eff_load = target_load(this_cpu, sd->wake_idx);
prev_eff_load = source_load(prev_cpu, sd->wake_idx);
if (sync) {
unsigned long current_load = task_h_load(current);
@ -5742,6 +5741,7 @@ wake_affine_weight(struct sched_domain *sd, struct task_struct *p,
this_eff_load *= 100;
this_eff_load *= capacity_of(prev_cpu);
prev_eff_load = source_load(prev_cpu, sd->wake_idx);
prev_eff_load -= task_load;
if (sched_feat(WA_BIAS))
prev_eff_load *= 100 + (sd->imbalance_pct - 100) / 2;