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    Subject[RFC PATCH V2 0/4] cpuidle: global registration of idle states with per-cpu statistics
    The core change is to split the cpuidle_device structure into parts
    that can be global and parts that has to remain per-cpu. The per-cpu
    pieces are mostly generic statistics that can be independent of
    current running driver.

    * Simplify the cpuidle subsystem framework and have
    registration/unregistration done by single cpu.

    * Have single copy of cpuidle_states structure and thus reduce
    memory consumption.

    * Only in very rare cases asymmetric C-states exist which
    can be handled within the cpuidle driver. Most architectures
    do not have asymmetric C-states.

    * References:

    The first couple of patches in the series move the statistics accounting
    part to withing cpuidle driver; which ensures correctness in updation
    of statistics. Moving statistics within cpuidle driver is also required to
    make cpuidle_state not writable and thus global. Third patch splits
    the per-cpu part out of cpuidle_state structure and the fourth patch
    makes the cpuidle_state global. Please refer to . Version 1 of the series is at

    This patch series applies on top of 2.6.38 and is tested on x86 Nehalem
    system with multiple ACPI C-States.

    To Do:

    1. This patch series works only for acpi_idle driver. Changes would
    have to be done for other idle drivers i.e. intel_idle, at91_idle_driver,
    davinci_idle_driver, kirkwood_idle_driver, omap3_idle_driver.

    2. Make ladder governor follow changed API. Currently it works for menu
    governor only.



    Trinabh Gupta (4):
    Single/Global registration of idle states
    Split cpuidle_state structure and move per-cpu statistics fields
    Remove CPUIDLE_FLAG_IGNORE and dev->prepare()
    Move dev->last_residency update to driver enter routine; remove dev->last_state

    drivers/acpi/processor_driver.c | 18 ----
    drivers/acpi/processor_idle.c | 184 ++++++++++++++++++++++++++++++--------
    drivers/cpuidle/cpuidle.c | 80 +++++------------
    drivers/cpuidle/driver.c | 26 +++++
    drivers/cpuidle/governors/menu.c | 25 +++--
    drivers/cpuidle/sysfs.c | 18 ++--
    include/linux/cpuidle.h | 49 ++++++----
    7 files changed, 247 insertions(+), 153 deletions(-)


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