linux-kernel - [PATCH v2 0/7] The power allocator thermal governor

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Date:	Thu, 26 Feb 2015 19:00:26 +0000
From:	Javi Merino <javi.merino@....com>
To:	edubezval@...il.com, rui.zhang@...el.com
Cc:	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	punit.agrawal@....com, broonie@...nel.org, tixy@...aro.org,
	Javi Merino <javi.merino@....com>
Subject: [PATCH v2 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 an extended cooling device API
introduced in patch 2 (thermal: extend the cooling device API to
include power information).  Patch 3 (thermal: cpu_cooling: implement
the power cooling device API) extends the cpu cooling device using a
simple power model.

This series are based on branch "linus" of Eduardo's linux-soc-thermal
tree:

git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal.git

Changes since v1:
  - Removed a memory leak pointed out by Steve Rostedt
  - Relax the constraint of the trip points to be the first and last
    passive trip point as Lina Iyer suggested.
  - Update how the governor treats weights to mimic the behavior of
    fair share in v3 of the weight fixes series.
  - Don't cache the cpufreq_cooling_device and scan for it whenever
    we need it.
  - Consider the rate of changes in the derivative term of the PID
    controller

Changes since RFC v6:
  - Addressed Eduardo's review
    + Pass the interval to the static power function as suggested by
      Eduardo
    + Make the cooling device ops return 0 or -E* and put the
      calculation in a parameter, like the rest of the cooling device
      ops
    + Documentation improvements
  - Use thermal_cdev_update() to change cooling device states
  - Add a patch to export the power allocator governor's tzp
    parameters to sysfs

Changes since RFC v5:
  - Addressed Stephen's review of the trace patches.
  - Removed power actors and extended the cooling device interface
    instead.
  - Let platforms override the power allocator governor parameters in
    their thermal zone parameters

Changes since RFC v4:
  - Add more tracing
  - Document some of the limitations of the power allocator governor
  - Export the power_actor API and move power_actor.h to include/linux

Changes since RFC 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 RFC 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 RFC 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

Cheers,
Javi & Punit

Javi Merino (6):
  thermal: let governors have private data for each thermal zone
  thermal: extend the cooling device API to include power information
  thermal: cpu_cooling: implement the power cooling device API
  thermal: introduce the Power Allocator governor
  thermal: add trace events to the power allocator governor
  thermal: export thermal_zone_parameters to sysfs

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

 .../devicetree/bindings/thermal/thermal.txt        |   9 +
 Documentation/thermal/cpu-cooling-api.txt          | 156 +++++-
 Documentation/thermal/power_allocator.txt          | 247 +++++++++
 Documentation/thermal/sysfs-api.txt                |  52 ++
 drivers/thermal/Kconfig                            |  15 +
 drivers/thermal/Makefile                           |   1 +
 drivers/thermal/cpu_cooling.c                      | 610 ++++++++++++++++++++-
 drivers/thermal/of-thermal.c                       |   4 +
 drivers/thermal/power_allocator.c                  | 533 ++++++++++++++++++
 drivers/thermal/thermal_core.c                     | 254 ++++++++-
 drivers/thermal/thermal_core.h                     |   8 +
 include/linux/cpu_cooling.h                        |  39 ++
 include/linux/thermal.h                            |  64 ++-
 include/trace/events/thermal.h                     |  58 ++
 include/trace/events/thermal_power_allocator.h     |  87 +++
 15 files changed, 2104 insertions(+), 33 deletions(-)
 create mode 100644 Documentation/thermal/power_allocator.txt
 create mode 100644 drivers/thermal/power_allocator.c
 create mode 100644 include/trace/events/thermal_power_allocator.h

-- 
1.9.1

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