From fe71bbb21ee14160f73f81b113d71145327a1c0d Mon Sep 17 00:00:00 2001 From: Peng Wang Date: Fri, 3 Jan 2020 19:44:00 +0800 Subject: [PATCH] sched/fair: calculate delta runnable load only when it's needed Move the code of calculation for delta_sum/delta_avg to where it is really needed to be done. Signed-off-by: Peng Wang Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Vincent Guittot Link: https://lkml.kernel.org/r/20200103114400.17668-1-rocking@linux.alibaba.com --- 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 d292883694b7..32c5421b6a25 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)