From: Lukasz Luba <lukasz.luba@arm.com>
To: linux-kernel@vger.kernel.org
Cc: linux-pm@vger.kernel.org, peterz@infradead.org,
rjw@rjwysocki.net, viresh.kumar@linaro.org,
vincent.guittot@linaro.org, qperret@google.com,
dietmar.eggemann@arm.com, vincent.donnefort@arm.com,
lukasz.luba@arm.com, Beata.Michalska@arm.com, mingo@redhat.com,
juri.lelli@redhat.com, rostedt@goodmis.org, segall@google.com,
mgorman@suse.de, bristot@redhat.com
Subject: [PATCH v2 0/2] Add allowed CPU capacity knowledge to EAS
Date: Fri, 4 Jun 2021 09:09:52 +0100 [thread overview]
Message-ID: <20210604080954.13915-1-lukasz.luba@arm.com> (raw)
Hi all,
The patch set v2 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.
Changelog:
v2:
- clamp the returned value from effective_cpu_util() and avoid irq
util scaling issues (Quentin)
v1 is available at [1]
Regards,
Lukasz
[1] https://lore.kernel.org/linux-pm/20210602135609.10867-1-lukasz.luba@arm.com/
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 | 19 +++++++++++++++----
4 files changed, 30 insertions(+), 8 deletions(-)
--
2.17.1
next reply other threads:[~2021-06-04 8:10 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-04 8:09 Lukasz Luba [this message]
2021-06-04 8:09 ` [PATCH v2 1/2] sched/fair: Take thermal pressure into account while estimating energy Lukasz Luba
2021-06-10 7:59 ` Vincent Guittot
2021-06-10 8:42 ` Lukasz Luba
2021-06-10 9:11 ` Vincent Guittot
2021-06-10 9:36 ` Lukasz Luba
2021-06-10 9:41 ` Vincent Guittot
2021-06-10 9:52 ` Lukasz Luba
2021-06-10 9:45 ` Vincent Guittot
2021-06-10 8:42 ` Dietmar Eggemann
2021-06-10 9:04 ` Lukasz Luba
2021-06-10 10:07 ` Dietmar Eggemann
2021-06-10 10:37 ` Lukasz Luba
2021-06-10 12:19 ` Vincent Guittot
2021-06-10 12:30 ` Lukasz Luba
2021-06-10 12:40 ` Vincent Guittot
2021-06-10 12:53 ` Lukasz Luba
2021-06-04 8:09 ` [PATCH v2 2/2] sched/cpufreq: Consider reduced CPU capacity in energy calculation Lukasz Luba
2021-06-09 15:01 ` Rafael J. Wysocki
2021-06-10 8:19 ` Lukasz Luba
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