linux-kernel - [PATCH 0/2] Add allowed CPU capacity knowledge to EAS

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Message-Id: <20210602135609.10867-1-lukasz.luba@arm.com>
Date:   Wed,  2 Jun 2021 14:56:07 +0100
From:   Lukasz Luba <lukasz.luba@....com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-pm@...r.kernel.org, peterz@...radead.org, rjw@...ysocki.net,
        viresh.kumar@...aro.org, vincent.guittot@...aro.org,
        qperret@...gle.com, dietmar.eggemann@....com,
        vincent.donnefort@....com, lukasz.luba@....com, mingo@...hat.com,
        juri.lelli@...hat.com, rostedt@...dmis.org, segall@...gle.com,
        mgorman@...e.de, bristot@...hat.com
Subject: [PATCH 0/2] Add allowed CPU capacity knowledge to EAS

Hi all,

This is a patch set which aims to add knowledge about reduced CPU capacity
into the Energy Model (EM) and Energy Aware Scheduler (EAS). Currently the
issue is that SchedUtil CPU frequency and EM frequency are not aligned,
when there is a CPU thermal capping. This causes an estimation error.
This patch set provides the information about allowed CPU capacity
into the EM (thanks to thermal pressure signal). This improves the
energy estimation. More info about this mechanism can be found in the
patches comments.

Regards,
Lukasz

Lukasz Luba (2):
  sched/fair: Take thermal pressure into account while estimating energy
  sched/cpufreq: Consider reduced CPU capacity in energy calculation

 include/linux/energy_model.h     | 16 +++++++++++++---
 include/linux/sched/cpufreq.h    |  2 +-
 kernel/sched/cpufreq_schedutil.c |  1 +
 kernel/sched/fair.c              | 13 +++++++++++--
 4 files changed, 26 insertions(+), 6 deletions(-)

-- 
2.17.1