Messages in this thread | | | From | "Javi Merino" <> | Subject | [RFC PATCH v5 00/10] The power allocator thermal governor | Date | Thu, 10 Jul 2014 15:18:38 +0100 |
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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 7 (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 1-3 adds array printing helpers to ftrace, which we then use in patch 9. Patch 4 is a generic documentation of the current thermal framework and can be merged separately.
Changes since 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 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 - Provide scripts to evaluate the proposal - Let the governor operate on cooling devices as well
Cheers, Javi & Punit
Dave Martin (1): tracing: Add array printing helpers
Javi Merino (8): tools lib traceevent: Generalize numeric argument tools lib traceevent: Add support for __print_u{8,16,32,64}_array() 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 | 61 +++ drivers/thermal/Kconfig | 23 + drivers/thermal/Makefile | 5 + drivers/thermal/cpu_actor.c | 501 +++++++++++++++++++++ drivers/thermal/of-thermal.c | 4 + drivers/thermal/power_actor.c | 70 +++ drivers/thermal/power_allocator.c | 485 ++++++++++++++++++++ drivers/thermal/thermal_core.c | 90 +++- drivers/thermal/thermal_core.h | 8 + include/linux/ftrace_event.h | 9 + include/linux/power_actor.h | 86 ++++ include/linux/thermal.h | 63 ++- include/trace/events/thermal_power_allocator.h | 138 ++++++ include/trace/ftrace.h | 17 + kernel/trace/trace_output.c | 55 +++ tools/lib/traceevent/event-parse.c | 88 +++- tools/lib/traceevent/event-parse.h | 8 +- 19 files changed, 1865 insertions(+), 31 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_allocator.c create mode 100644 include/linux/power_actor.h create mode 100644 include/trace/events/thermal_power_allocator.h
-- 1.9.1
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