git: x86_64: Implement idle mwait hint auto tuning

[Sepherosa Ziehau]

commit 1786faf9e0837dd7ac069226d45053086253153b
Author: Sepherosa Ziehau <sephe at dragonflybsd.org>
Date:   Sun Feb 2 21:48:19 2014 +0800

    x86_64: Implement idle mwait hint auto tuning
    
    The tuning is based on gd_idle_repeat.  The higher the gd_idle_repeat,
    the deeper cpu specific C-state the current CPU will enter.
    
    The idle mwait hint auto tuning could be enabled by setting sysctl
    machdep.mwait.CX.idle to "AUTO" or "AUTODEEP":
    "AUTO"     -- C0 ~ C2
    "AUTODEEP" -- C0 ~ deepest cpu specific C-state
    
    This will allow us to enter deepest cpu specific C-state, even if ACPI
    does not map its deepest C-State to the deepest cpu specific C-state.
    
    NOTE:
    AUTODEEP and C3+ cpu specific C-state is not bullet prove yet.  We need
    to get the bus master operations information from ACPI.

Summary of changes:
 sys/platform/pc64/x86_64/machdep.c | 70 ++++++++++++++++++++++++++++++--------
 1 file changed, 55 insertions(+), 15 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/1786faf9e0837dd7ac069226d45053086253153b


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