[PATCH 0/6] CPUoffline framework

[Mike Turquette]

This series is posted for posterity.  It has been NAK'd by the community
since CPU hotplug has been deemed an inappropriate mechanism for power
capping.

CPUoffline is a framework for taking CPU's offline via the hotplug
mechanism.  The framework itself is quite straightforward: a driver
arranges the CPUs into partitions.  Each partition is associated to a
governor thread and that thread implements a policy for taking CPUs in
that partition offline or online, based on some heuristic.

The CPUoffline core code includes a default driver that places all
possible CPUs into a single partition, requiring no code to be written
for a new platform.  There is also a single governor named "avgload"
which looks at the average load of all of the *online* CPUs in a
partition and makes a hotplug decision based on defined thresholds.

This framework owes a lot to CPUfreq and CPUidle, from which CPUoffline
stole^H^H^H^H^H borrowed lots of code.

Note: since development was cut short to community response, there are
some missing infrastructure bits such as module unregistration and
dynamic govenor switching.  The code does work fine as-is for the
curious-minded who want to test on an SMP system that supports hotplug.

Mike Turquette (6):
  ARM: do not mark CPU 0 as hotpluggable
  cpumask: introduce cpumask for hotpluggable CPUs
  cpu: update cpu_hotpluggable_mask in register_cpu
  cpuoffline core
  governors
  arm kconfig

 arch/arm/Kconfig                       |    2 +
 arch/arm/kernel/setup.c                |    3 +-
 drivers/Makefile                       |    1 +
 drivers/base/cpu.c                     |    4 +-
 drivers/cpuoffline/Kconfig             |   26 ++
 drivers/cpuoffline/Makefile            |    2 +
 drivers/cpuoffline/cpuoffline.c        |  488 ++++++++++++++++++++++++++++++++
 drivers/cpuoffline/governors/Kconfig   |    9 +
 drivers/cpuoffline/governors/Makefile  |    2 +
 drivers/cpuoffline/governors/avgload.c |  255 +++++++++++++++++
 include/linux/cpumask.h                |   27 ++-
 include/linux/cpuoffline.h             |   82 ++++++
 kernel/cpu.c                           |   18 ++
 13 files changed, 912 insertions(+), 7 deletions(-)
 create mode 100644 drivers/cpuoffline/Kconfig
 create mode 100644 drivers/cpuoffline/Makefile
 create mode 100644 drivers/cpuoffline/cpuoffline.c
 create mode 100644 drivers/cpuoffline/governors/Kconfig
 create mode 100644 drivers/cpuoffline/governors/Makefile
 create mode 100644 drivers/cpuoffline/governors/avgload.c
 create mode 100644 include/linux/cpuoffline.h

-- 
1.7.4.1