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

Javi Merino
2015-02-26T19:00:47Z

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