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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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