linux-kernel - [PATCH] sched/fair: eliminate redundant code in sched

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Date:   Fri, 16 Aug 2019 22:12:02 +0800
From:   Peng Liu <iwtbavbm@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     peterz@...radead.org, mingo@...hat.com
Subject: [PATCH] sched/fair: eliminate redundant code in sched_slice()

Since sched_slice() is used in high frequency,
small change should also make sense.

Signed-off-by: Peng Liu <iwtbavbm@...il.com>
---
 kernel/sched/fair.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 1054d2cf6aaa..6ae2a507aac0 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -694,19 +694,16 @@ static u64 sched_slice(struct cfs_rq *cfs_rq, struct sched_entity *se)
 	u64 slice = __sched_period(cfs_rq->nr_running + !se->on_rq);
 
 	for_each_sched_entity(se) {
-		struct load_weight *load;
 		struct load_weight lw;
 
 		cfs_rq = cfs_rq_of(se);
-		load = &cfs_rq->load;
+		lw = cfs_rq->load;
 
-		if (unlikely(!se->on_rq)) {
+		if (unlikely(!se->on_rq))
 			lw = cfs_rq->load;
 
-			update_load_add(&lw, se->load.weight);
-			load = &lw;
-		}
-		slice = __calc_delta(slice, se->load.weight, load);
+		update_load_add(&lw, se->load.weight);
+		slice = __calc_delta(slice, se->load.weight, &lw);
 	}
 	return slice;
 }
-- 
2.17.1