[PATCH] sched/fair: calculate delta runnable load only when it's needed
From: Peng Wang
Date: Fri Jan 03 2020  06:45:42 EST
Move the code of calculation for delta_sum/delta_avg to where
it is really needed to be done.
Signedoffby: Peng Wang <rocking@xxxxxxxxxxxxxxxxx>

kernel/sched/fair.c  11 ++++++
1 file changed, 6 insertions(+), 5 deletions()
diff git a/kernel/sched/fair.c b/kernel/sched/fair.c
index ba749f579714..6b7e6b528e9b 100644
 a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ 3366,16 +3366,17 @@ update_tg_cfs_runnable(struct cfs_rq *cfs_rq, struct sched_entity *se, struct cf
runnable_load_sum = (s64)se_runnable(se) * runnable_sum;
runnable_load_avg = div_s64(runnable_load_sum, LOAD_AVG_MAX);
 delta_sum = runnable_load_sum  se_weight(se) * se>avg.runnable_load_sum;
 delta_avg = runnable_load_avg  se>avg.runnable_load_avg;

 se>avg.runnable_load_sum = runnable_sum;
 se>avg.runnable_load_avg = runnable_load_avg;
if (se>on_rq) {
+ delta_sum = runnable_load_sum 
+ se_weight(se) * se>avg.runnable_load_sum;
+ delta_avg = runnable_load_avg  se>avg.runnable_load_avg;
add_positive(&cfs_rq>avg.runnable_load_avg, delta_avg);
add_positive(&cfs_rq>avg.runnable_load_sum, delta_sum);
}
+
+ se>avg.runnable_load_sum = runnable_sum;
+ se>avg.runnable_load_avg = runnable_load_avg;
}
static inline void add_tg_cfs_propagate(struct cfs_rq *cfs_rq, long runnable_sum)

2.24.0