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Date:   Wed, 03 Mar 2021 09:49:37 -0000
From:   "tip-bot2 for Vincent Guittot" <tip-bot2@linutronix.de>
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Subject: [tip: sched/core] sched/fair: Reorder newidle_balance pulled_task tests
Cc:     Vincent Guittot <vincent.guittot@linaro.org>,
        "Peter Zijlstra (Intel)" <peterz@infradead.org>,
        Valentin Schneider <valentin.schneider@arm.com>,
        x86@kernel.org, linux-kernel@vger.kernel.org
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The following commit has been merged into the sched/core branch of tip:

Commit-ID:     053192dea58da994fb3dd7ad235440accf292a08
Gitweb:        https://git.kernel.org/tip/053192dea58da994fb3dd7ad235440accf292a08
Author:        Vincent Guittot <vincent.guittot@linaro.org>
AuthorDate:    Wed, 24 Feb 2021 14:30:05 +01:00
Committer:     Peter Zijlstra <peterz@infradead.org>
CommitterDate: Wed, 03 Mar 2021 10:32:59 +01:00

sched/fair: Reorder newidle_balance pulled_task tests

Reorder the tests and skip useless ones when no load balance has been
performed and rq lock has not been released.

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
Link: https://lkml.kernel.org/r/20210224133007.28644-6-vincent.guittot@linaro.org
---
 kernel/sched/fair.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 3c00918..356a245 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -10584,7 +10584,6 @@ static int newidle_balance(struct rq *this_rq, struct rq_flags *rf)
 	if (curr_cost > this_rq->max_idle_balance_cost)
 		this_rq->max_idle_balance_cost = curr_cost;
 
-out:
 	/*
 	 * While browsing the domains, we released the rq lock, a task could
 	 * have been enqueued in the meantime. Since we're not going idle,
@@ -10593,14 +10592,15 @@ out:
 	if (this_rq->cfs.h_nr_running && !pulled_task)
 		pulled_task = 1;
 
-	/* Move the next balance forward */
-	if (time_after(this_rq->next_balance, next_balance))
-		this_rq->next_balance = next_balance;
-
 	/* Is there a task of a high priority class? */
 	if (this_rq->nr_running != this_rq->cfs.h_nr_running)
 		pulled_task = -1;
 
+out:
+	/* Move the next balance forward */
+	if (time_after(this_rq->next_balance, next_balance))
+		this_rq->next_balance = next_balance;
+
 	if (pulled_task)
 		this_rq->idle_stamp = 0;
 	else