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    Subject[RFC PATCH v1 0/2] sched: unified sched_powersavings tunables

    I have created the following RFC patch based on the recent discussions
    and consensus on simplifying the power aware scheduler in the kernel.

    Ref: LWN: Rethinking power-aware scheduling

    The goal of the unified tunable are as follows:

    * Simple and single tunable for different (all) topology
    * Good default powersavings for kernel
    * Potential to map this setting to other subsystems like cpufreq and

    What this patch does: (first step)

    * Create a single sched_powersavings tunable in sysfs
    * Enable current sched_mc and sched_smt features based on
    value of this single tunable

    What this patch is yet to do:

    * Tune the default power savings to pack packages only till
    a threshold of say 50%
    * Add notifiers to change setting on battery/AC transitions
    * Feed the thresholds from arch specific code so that different archs
    can do 'optimal' packing based on topology
    * May be move this to /sys/device/system/powersavings and add additional
    platform tunables like x86_energy_perf_policy?

    This RFC has only x86 changes and has been tested on dual-socket,
    quad-core,HT configuration.

    Please let me know your comments and feedback.



    Vaidyanathan Srinivasan (2):
    sched: unified sched_powersavings sysfs tunable
    sched: fix group_capacity for thread level consolidation

    arch/x86/Kconfig | 20 ++++--------
    arch/x86/kernel/smpboot.c | 2 +
    block/blk.h | 11 ++++---
    drivers/base/cpu.c | 2 +
    include/linux/sched.h | 29 +++++++++--------
    include/linux/topology.h | 9 +----
    kernel/sched/core.c | 75 +++++++++++----------------------------------
    kernel/sched/fair.c | 38 ++++++++++++++++-------
    8 files changed, 77 insertions(+), 109 deletions(-)

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      Last update: 2012-01-16 17:25    [W:0.024 / U:78.816 seconds]
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