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From: vincent.donnefort@arm.com
To: peterz@infradead.org, mingo@redhat.com, vincent.guittot@linaro.org
Cc: dietmar.eggemann@arm.com, linux-kernel@vger.kernel.org,
	qperret@google.com, patrick.bellasi@matbug.net,
	valentin.schneider@arm.com,
	Vincent Donnefort <vincent.donnefort@arm.com>
Subject: [PATCH v2 2/2] sched/fair: use lsub_positive in cpu_util_next()
Date: Thu, 25 Feb 2021 08:36:12 +0000	[thread overview]
Message-ID: <20210225083612.1113823-3-vincent.donnefort@arm.com> (raw)
In-Reply-To: <20210225083612.1113823-1-vincent.donnefort@arm.com>

From: Vincent Donnefort <vincent.donnefort@arm.com>

The sub_positive local version is saving an explicit load-store and is
enough for the cpu_util_next() usage.

Signed-off-by: Vincent Donnefort <vincent.donnefort@arm.com>

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 146ac9fec4b6..1364f8b95214 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6525,7 +6525,7 @@ static unsigned long cpu_util_next(int cpu, struct task_struct *p, int dst_cpu)
 	 * util_avg should already be correct.
 	 */
 	if (task_cpu(p) == cpu && dst_cpu != cpu)
-		sub_positive(&util, task_util(p));
+		lsub_positive(&util, task_util(p));
 	else if (task_cpu(p) != cpu && dst_cpu == cpu)
 		util += task_util(p);
 
-- 
2.25.1


  parent reply	other threads:[~2021-02-25  8:38 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-25  8:36 [PATCH v2 0/2] Fix task utilization accountability for EAS vincent.donnefort
2021-02-25  8:36 ` [PATCH v2 1/2] sched/fair: Fix task utilization accountability in compute_energy() vincent.donnefort
2021-02-25  8:52   ` Quentin Perret
2021-02-25 11:45   ` Dietmar Eggemann
2021-02-25 11:58     ` Quentin Perret
2021-02-25 16:23     ` Vincent Donnefort
2021-03-02  9:01   ` [tip: sched/core] " tip-bot2 for Vincent Donnefort
2021-03-03  9:49   ` tip-bot2 for Vincent Donnefort
2021-03-06 11:42   ` tip-bot2 for Vincent Donnefort
2021-02-25  8:36 ` vincent.donnefort [this message]
2021-02-25  8:53   ` [PATCH v2 2/2] sched/fair: use lsub_positive in cpu_util_next() Quentin Perret
2021-02-25 11:46   ` Dietmar Eggemann
2021-03-02  9:01   ` [tip: sched/core] " tip-bot2 for Vincent Donnefort
2021-03-03  9:49   ` tip-bot2 for Vincent Donnefort
2021-03-06 11:42   ` tip-bot2 for Vincent Donnefort
2021-02-25 17:29 ` [PATCH v2 0/2] Fix task utilization accountability for EAS Peter Zijlstra

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