linux-kernel - Re: [PATCH v7 00/23] Introduce runtime modifiable Energy Model

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Date: Wed, 7 Feb 2024 11:49:09 +0000
From: Lukasz Luba <lukasz.luba@....com>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: dietmar.eggemann@....com, linux-pm@...r.kernel.org, rui.zhang@...el.com,
 amit.kucheria@...durent.com, amit.kachhap@...il.com,
 daniel.lezcano@...aro.org, viresh.kumar@...aro.org, len.brown@...el.com,
 pavel@....cz, mhiramat@...nel.org, qyousef@...alina.io,
 linux-kernel@...r.kernel.org, wvw@...gle.com, xuewen.yan94@...il.com
Subject: Re: [PATCH v7 00/23] Introduce runtime modifiable Energy Model



On 2/7/24 10:31, Rafael J. Wysocki wrote:
> Hi Lukasz,
> 
> On Wed, Feb 7, 2024 at 10:15 AM Lukasz Luba <lukasz.luba@....com> wrote:
>>
>> Hi Rafael,
>>
>> On 1/17/24 09:56, Lukasz Luba wrote:
>>> Hi all,
>>>
>>> This patch set adds a new feature which allows to modify Energy Model (EM)
>>> power values at runtime. It will allow to better reflect power model of
>>> a recent SoCs and silicon. Different characteristics of the power usage
>>> can be leveraged and thus better decisions made during task placement in EAS.
>>>
>>
>> [snip]
>>
>>>
>>>
>>> Lukasz Luba (23):
>>>     PM: EM: Add missing newline for the message log
>>>     PM: EM: Extend em_cpufreq_update_efficiencies() argument list
>>>     PM: EM: Find first CPU active while updating OPP efficiency
>>>     PM: EM: Refactor em_pd_get_efficient_state() to be more flexible
>>>     PM: EM: Introduce em_compute_costs()
>>>     PM: EM: Check if the get_cost() callback is present in
>>>       em_compute_costs()
>>>     PM: EM: Split the allocation and initialization of the EM table
>>>     PM: EM: Introduce runtime modifiable table
>>>     PM: EM: Use runtime modified EM for CPUs energy estimation in EAS
>>>     PM: EM: Add functions for memory allocations for new EM tables
>>>     PM: EM: Introduce em_dev_update_perf_domain() for EM updates
>>>     PM: EM: Add em_perf_state_from_pd() to get performance states table
>>>     PM: EM: Add performance field to struct em_perf_state and optimize
>>>     PM: EM: Support late CPUs booting and capacity adjustment
>>>     PM: EM: Optimize em_cpu_energy() and remove division
>>>     powercap/dtpm_cpu: Use new Energy Model interface to get table
>>>     powercap/dtpm_devfreq: Use new Energy Model interface to get table
>>>     drivers/thermal/cpufreq_cooling: Use new Energy Model interface
>>>     drivers/thermal/devfreq_cooling: Use new Energy Model interface
>>>     PM: EM: Change debugfs configuration to use runtime EM table data
>>>     PM: EM: Remove old table
>>>     PM: EM: Add em_dev_compute_costs()
>>>     Documentation: EM: Update with runtime modification design
>>>
>>>    Documentation/power/energy-model.rst | 183 ++++++++++-
>>>    drivers/powercap/dtpm_cpu.c          |  39 ++-
>>>    drivers/powercap/dtpm_devfreq.c      |  34 +-
>>>    drivers/thermal/cpufreq_cooling.c    |  45 ++-
>>>    drivers/thermal/devfreq_cooling.c    |  49 ++-
>>>    include/linux/energy_model.h         | 165 ++++++----
>>>    kernel/power/energy_model.c          | 472 +++++++++++++++++++++++----
>>>    7 files changed, 819 insertions(+), 168 deletions(-)
>>>
>>
>> The patch set went through decent review. If you don't have any issues,
>> I will collect the tags and send the v8 which will be re-based on some
>> recent linux next (or please tell me your preferred branch).
> 
> Blease base it on 6.8-rc3.

OK, thanks