linux-kernel - [PATCH V5 0/3] cpufreq_cooling: Get effective CPU utilization from scheduler

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Message-Id: <cover.1607400596.git.viresh.kumar@linaro.org>
Date:   Tue,  8 Dec 2020 09:46:54 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Amit Daniel Kachhap <amit.kachhap@...il.com>,
        Amit Kucheria <amitk@...nel.org>,
        Ben Segall <bsegall@...gle.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Javi Merino <javi.merino@...nel.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Mel Gorman <mgorman@...e.de>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Steven Rostedt <rostedt@...dmis.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Zhang Rui <rui.zhang@...el.com>
Cc:     linux-kernel@...r.kernel.org, Quentin Perret <qperret@...gle.com>,
        Lukasz Luba <lukasz.luba@....com>, linux-pm@...r.kernel.org,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH V5 0/3] cpufreq_cooling: Get effective CPU utilization from scheduler

Hi,

This patchset makes the cpufreq_cooling driver reuse the CPU utilization
metric provided by the scheduler instead of depending on idle and busy
times of a CPU, which aren't that accurate to measure the busyness of a
CPU for the next cycle. More details can be seen in the commit logs of
the patches.

V4->V5:
- Don't export enum cpu_util_type and don't pass it as argument to
  sched_cpu_util().
- Fixed a build issue with !CONFIG_THERMAL_GOV_POWER_ALLOCATOR by moving
  {allocate|free}_idle_time() out of CONFIG_THERMAL_GOV_POWER_ALLOCATOR
  in patch 3/3.
- Applied Acks from Rafael.

V3->V4:
- Broke the first patch into two parts and used effective_cpu_util() in
  schedutil (Rafael).

- Removed comment about idle-injection in last patch based on feedback
  from Lukasz and added hi Reviewed-by tag.

V2->V3:
- Put the scheduler helpers within ifdef CONFIG_SMP.
- Keep both SMP and !SMP implementations in the cpufreq_cooling driver.
- Improved commit log with testing related information.

--
Viresh

Viresh Kumar (3):
  sched/core: Move schedutil_cpu_util() to core.c
  sched/core: Rename schedutil_cpu_util() and allow rest of the kernel
    to use it
  thermal: cpufreq_cooling: Reuse sched_cpu_util() for SMP platforms

 drivers/thermal/cpufreq_cooling.c |  69 ++++++++++++++----
 include/linux/sched.h             |   5 ++
 kernel/sched/core.c               | 114 ++++++++++++++++++++++++++++++
 kernel/sched/cpufreq_schedutil.c  | 108 +---------------------------
 kernel/sched/fair.c               |   6 +-
 kernel/sched/sched.h              |  22 ++----
 6 files changed, 184 insertions(+), 140 deletions(-)


base-commit: 3650b228f83adda7e5ee532e2b90429c03f7b9ec
-- 
2.25.0.rc1.19.g042ed3e048af