tree 85c3a9521691b437cb7a76b701331d3992361f46
parent 9e9a928eed8796a0a1aaed7e0b676db86ba84594
parent bf8102228a8bf053051f311e5486042fe0542894
author Linus Torvalds <torvalds@linux-foundation.org> 1401893334 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1401893334 -0700
mergetag object bf8102228a8bf053051f311e5486042fe0542894
 type commit
 tag pm-3.15-final
 tagger Rafael J. Wysocki <rjw@rjwysocki.net> 1401830502 +0200
 
 Final power management fixes for 3.15
 
  - Taking non-idle time into account when calculating core busy
    time was a mistake and led to a performance regression.  Since
    the problem it was supposed to address is now taken care of in
    a different way, we don't need to do it any more, so drop the
    non-idle time tracking from intel_pstate.  Dirk Brandewie.
 
  - Changing to fixed point math throughout the busy calculation
    introduced rounding errors that adversely affect the accuracy
    of intel_pstate's computations.  Fix from Dirk Brandewie.
 
  - The PID controller algorithm used by intel_pstate assumes that
    the time interval between two adjacent samples will always be the
    same which is not the case for deferable timers (used by
    intel_pstate) when the system is idle. This leads to inaccurate
    predictions and artificially increases convergence times for
    the minimum P-state.  Fix from Dirk Brandewie.
 
  - intel_pstate carries out computations using 32-bit variables
    that may overflow for large enough values of APERF/MPERF.  Switch
    to using 64-bit variables for computations, from Doug Smythies.
 
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Merge tag 'pm-3.15-final' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull intel pstate fixes from Rafael Wysocki:
 "Final power management fixes for 3.15

   - Taking non-idle time into account when calculating core busy time
     was a mistake and led to a performance regression.  Since the
     problem it was supposed to address is now taken care of in a
     different way, we don't need to do it any more, so drop the
     non-idle time tracking from intel_pstate.  Dirk Brandewie.

   - Changing to fixed point math throughout the busy calculation
     introduced rounding errors that adversely affect the accuracy of
     intel_pstate's computations.  Fix from Dirk Brandewie.

   - The PID controller algorithm used by intel_pstate assumes that the
     time interval between two adjacent samples will always be the same
     which is not the case for deferable timers (used by intel_pstate)
     when the system is idle.  This leads to inaccurate predictions and
     artificially increases convergence times for the minimum P-state.
     Fix from Dirk Brandewie.

   - intel_pstate carries out computations using 32-bit variables that
     may overflow for large enough values of APERF/MPERF.  Switch to
     using 64-bit variables for computations, from Doug Smythies"

* tag 'pm-3.15-final' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  intel_pstate: Improve initial busy calculation
  intel_pstate: add sample time scaling
  intel_pstate: Correct rounding in busy calculation
  intel_pstate: Remove C0 tracking