[RFC PATCH v3 0/7] The power allocator thermal governor

Javi Merino
2014-06-03T10:19:04Z

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 5
(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.

Patches 1 and 2 are not proper parts of these series and can be merged
separately. Patch 1 (tracing: Add __bitmask() macro to trace events
to cpumasks and other bitmasks) is already in for-next[1]. Patch 2
(thermal: document struct thermal_zone_device and thermal_governor)
has already been submitted to linux-pm[2] and is generic.

[1] https://git.kernel.org/cgit/linux/kernel/git/rostedt/linux-trace.git/commit/?h=for-next&id=4449bf927b61b
db4389393c6fea6837214d1ace7
[2] http://article.gmane.org/gmane.linux.power-management.general/46041

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:
- Fix kerneldoc strings
- Use tz->passive
- Use cpufreq_get() to get the frequency of the cpu instead of
using the notifiers.
- 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

Steven Rostedt (Red Hat) (1):
tracing: Add __bitmask() macro to trace events to cpumasks and other
bitmasks

Documentation/thermal/power_actor.txt | 164 ++++++++
Documentation/thermal/power_allocator.txt | 42 +++
drivers/thermal/Kconfig | 23 ++
drivers/thermal/Makefile | 3 +
drivers/thermal/power_actor/Kconfig | 9 +
drivers/thermal/power_actor/Makefile | 7 +
drivers/thermal/power_actor/cpu_actor.c | 606 ++++++++++++++++++++++++++++++
drivers/thermal/power_actor/power_actor.c | 64 ++++
drivers/thermal/power_actor/power_actor.h | 105 ++++++
drivers/thermal/power_allocator.c | 465 +++++++++++++++++++++++
drivers/thermal/thermal_core.c | 90 ++++-
drivers/thermal/thermal_core.h | 8 +
include/linux/ftrace_event.h | 3 +
include/linux/thermal.h | 62 ++-
include/linux/trace_seq.h | 10 +
include/trace/events/thermal.h | 38 ++
include/trace/events/thermal_governor.h | 37 ++
include/trace/ftrace.h | 57 ++-
kernel/trace/trace_output.c | 41 ++
19 files changed, 1822 insertions(+), 12 deletions(-)
create mode 100644 Documentation/thermal/power_actor.txt
create mode 100644 Documentation/thermal/power_allocator.txt
create mode 100644 drivers/thermal/power_actor/Kconfig
create mode 100644 drivers/thermal/power_actor/Makefile
create mode 100644 drivers/thermal/power_actor/cpu_actor.c
create mode 100644 drivers/thermal/power_actor/power_actor.c
create mode 100644 drivers/thermal/power_actor/power_actor.h
create mode 100644 drivers/thermal/power_allocator.c
create mode 100644 include/trace/events/thermal.h
create mode 100644 include/trace/events/thermal_governor.h

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1.9.1