linux-kernel - [RFC PATCH v4 0/7] The power allocator thermal governor

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Date:	Tue, 17 Jun 2014 10:14:46 +0100
From:	"Javi Merino" <javi.merino@....com>
To:	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	punit.agrawal@....com, broonie@...nel.org,
	Javi Merino <javi.merino@....com>
Subject: [RFC PATCH v4 0/7] The power allocator thermal governor

Hi linux-pm,

The power allocator governor allocates device power to control
temperature.  This requires transforming performance requests into
requested power, which we do with the aid of power models.  Patch 4
(thermal: add a basic cpu power actor) implements a simple power model
for cpus.  The division of power between the actors ensures that power
is allocated where it is needed the most, based on the current
workload.

Patch 1 is a generic documentation of the current thermal framework
and can be merged separately.

Changes since v3:
  - Use tz->passive to poll faster when the first trip point is hit.
  - Don't make a special directory for power_actors
  - Add a DT property for sustainable-power
  - Simplify the static power interface and pass the current thermal
    zone in every power_actor_ops to remove the controversial
    enum power_actor_types
  - Use locks with the actor_list list
  - Use cpufreq_get() to get the frequency of the cpu instead of
    using the notifiers.
  - Remove the prompt for THERMAL_POWER_ACTOR_CPU when configuring
    the kernel

Changes since v2:
  - Changed the PI controller into a PID controller
  - Added static power to the cpu power model
  - tz parameter max_dissipatable_power renamed to sustainable_power
  - Register the cpufreq cooling device as part of the
    power_cpu_actor registration.

Changes since v1:
  - Fixed finding cpufreq cooling devices in cpufreq_frequency_change()
  - Replaced the cooling device interface with a separate power actor
    API
  - Addressed most of Eduardo's comments
  - Incorporated ftrace support for bitmask to trace cpumasks

Todo:
  - Rethink the use of trip points and make it less intrusive
  - Let platforms override the power allocator governor parameters
  - Add more tracing and provide scripts to evaluate the proposal.
  - Tune it to achieve the temperature stability we are aiming for

Cheers,
Javi & Punit

Javi Merino (6):
  thermal: document struct thermal_zone_device and thermal_governor
  thermal: let governors have private data for each thermal zone
  thermal: introduce the Power Actor API
  thermal: add a basic cpu power actor
  thermal: introduce the Power Allocator governor
  thermal: add trace events to the power allocator governor

Punit Agrawal (1):
  of: thermal: Introduce sustainable power for a thermal zone

 .../devicetree/bindings/thermal/thermal.txt        |   4 +
 Documentation/thermal/power_actor.txt              | 181 ++++++++
 Documentation/thermal/power_allocator.txt          |  41 ++
 drivers/thermal/Kconfig                            |  21 +
 drivers/thermal/Makefile                           |   5 +
 drivers/thermal/cpu_actor.c                        | 484 +++++++++++++++++++++
 drivers/thermal/of-thermal.c                       |   4 +
 drivers/thermal/power_actor.c                      |  68 +++
 drivers/thermal/power_actor.h                      |  91 ++++
 drivers/thermal/power_allocator.c                  | 477 ++++++++++++++++++++
 drivers/thermal/thermal_core.c                     |  90 +++-
 drivers/thermal/thermal_core.h                     |   8 +
 include/linux/thermal.h                            |  63 ++-
 include/trace/events/thermal_power.h               |  62 +++
 14 files changed, 1588 insertions(+), 11 deletions(-)
 create mode 100644 Documentation/thermal/power_actor.txt
 create mode 100644 Documentation/thermal/power_allocator.txt
 create mode 100644 drivers/thermal/cpu_actor.c
 create mode 100644 drivers/thermal/power_actor.c
 create mode 100644 drivers/thermal/power_actor.h
 create mode 100644 drivers/thermal/power_allocator.c
 create mode 100644 include/trace/events/thermal_power.h

-- 
1.9.1


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