linux-kernel - [tip: sched/core] sched/fair: Cleanup newidle

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Message-ID: <163567538377.626.7918130057155925733.tip-bot2@tip-bot2>
Date:   Sun, 31 Oct 2021 10:16:23 -0000
From:   "tip-bot2 for Vincent Guittot" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Vincent Guittot <vincent.guittot@...aro.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Mel Gorman <mgorman@...e.de>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: sched/core] sched/fair: Cleanup newidle_balance

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     8ea9183db4ad8afbcb7089a77c23eaf965b0cacd
Gitweb:        https://git.kernel.org/tip/8ea9183db4ad8afbcb7089a77c23eaf965b0cacd
Author:        Vincent Guittot <vincent.guittot@...aro.org>
AuthorDate:    Tue, 19 Oct 2021 14:35:37 +02:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Sun, 31 Oct 2021 11:11:38 +01:00

sched/fair: Cleanup newidle_balance

update_next_balance() uses sd->last_balance which is not modified by
load_balance() so we can merge the 2 calls in one place.

No functional change

Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@....com>
Acked-by: Mel Gorman <mgorman@...e.de>
Link: https://lore.kernel.org/r/20211019123537.17146-6-vincent.guittot@linaro.org
---
 kernel/sched/fair.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 57eae0e..13950be 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -10916,10 +10916,10 @@ static int newidle_balance(struct rq *this_rq, struct rq_flags *rf)
 		int continue_balancing = 1;
 		u64 domain_cost;
 
-		if (this_rq->avg_idle < curr_cost + sd->max_newidle_lb_cost) {
-			update_next_balance(sd, &next_balance);
+		update_next_balance(sd, &next_balance);
+
+		if (this_rq->avg_idle < curr_cost + sd->max_newidle_lb_cost)
 			break;
-		}
 
 		if (sd->flags & SD_BALANCE_NEWIDLE) {
 
@@ -10935,8 +10935,6 @@ static int newidle_balance(struct rq *this_rq, struct rq_flags *rf)
 			t0 = t1;
 		}
 
-		update_next_balance(sd, &next_balance);
-
 		/*
 		 * Stop searching for tasks to pull if there are
 		 * now runnable tasks on this rq.