linux-kernel - [PATCH 0/3] Fix stuck overutilized

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Message-Id: <20211220114323.22811-1-vincent.donnefort@arm.com>
Date:   Mon, 20 Dec 2021 12:43:20 +0100
From:   Vincent Donnefort <vincent.donnefort@....com>
To:     peterz@...radead.org, mingo@...hat.com, vincent.guittot@...aro.org
Cc:     linux-kernel@...r.kernel.org, dietmar.eggemann@....com,
        valentin.schneider@....com, morten.rasmussen@....com,
        qperret@...gle.com, Vincent Donnefort <vincent.donnefort@....com>
Subject: [PATCH 0/3] Fix stuck overutilized

The overutilized signal indicates when one of the CPU of the root domain has an
utilization above a certain threshold (0.8 * cpu_capacity). Its sole purpose is
to disable EAS on asymmetric CPU capacity systems in favor of CAS. Under certain
circumstances, described in the following patches, this signal can stay stuck.

The two first patches of this series intends to fix this blockage, while the
last one is an improvement.

Vincent Donnefort (3):
  sched/fair: Make cpu_overutilized() EAS dependent
  sched/fair: Fix newidle_balance() for overutilized systems
  sched/fair: Do not raise overutilized for idle CPUs

 kernel/sched/fair.c | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

-- 
2.25.1