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Subject[RFC PATCH v2 0/7] The power allocator thermal governor
Date
Hi linux-pm,

This is v2 of the RFC we sent in [1]. 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.

[1] http://thread.gmane.org/gmane.linux.power-management.general/45000

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. Patch 2
(thermal: document struct thermal_zone_device and thermal_governor)
has already been submitted to linux-pm[2] and is generic.

[2] http://article.gmane.org/gmane.linux.power-management.general/45434

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

Todo:
- Add static power to the cpu power model
- Change the PI controller into a PID controller
- Turn power actors into a device
- 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 | 75 +++++
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 | 424 +++++++++++++++++++++++++++
drivers/thermal/power_actor/power_actor.c | 66 +++++
drivers/thermal/power_actor/power_actor.h | 86 ++++++
drivers/thermal/power_allocator.c | 452 +++++++++++++++++++++++++++++
drivers/thermal/thermal_core.c | 90 +++++-
drivers/thermal/thermal_core.h | 8 +
include/linux/ftrace_event.h | 3 +
include/linux/thermal.h | 58 +++-
include/linux/trace_seq.h | 10 +
include/trace/events/thermal.h | 38 +++
include/trace/events/thermal_governor.h | 35 +++
include/trace/ftrace.h | 57 +++-
kernel/trace/trace_output.c | 41 +++
19 files changed, 1515 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

--
1.7.9.5




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