src/hotspot/share/runtime/objectMonitor.cpp

rev 51780 : imported patch syncknobs-00-base
rev 51781 : imported patch syncknobs-01-Knob_ReportSettings
rev 51782 : imported patch syncknobs-02-Knob_SpinBackOff
rev 51783 : imported patch syncknobs-03-BackOffMask
rev 51784 : imported patch syncknobs-04-Knob_ExitRelease
rev 51785 : imported patch syncknobs-05-Knob_InlineNotify
rev 51786 : imported patch syncknobs-06-Knob_Verbose
rev 51787 : imported patch syncknobs-07-Knob_VerifyInUse
rev 51788 : imported patch syncknobs-08-Knob_VerifyMatch
rev 51789 : imported patch syncknobs-09-Knob_SpinBase
rev 51790 : imported patch syncknobs-10-Knob_CASPenalty
rev 51791 : imported patch syncknobs-11-Knob_OXPenalty
rev 51792 : imported patch syncknobs-12-Knob_SpinSetSucc
rev 51793 : imported patch syncknobs-13-Knob_SpinEarly
rev 51794 : imported patch syncknobs-14-Knob_SuccEnabled
rev 51795 : imported patch syncknobs-15-Knob_SuccRestrict

*** 101,111 ****
  // The knob* variables are effectively final.  Once set they should
  // never be modified hence.  Consider using __read_mostly with GCC.
  
  int ObjectMonitor::Knob_SpinLimit    = 5000;    // derived by an external tool -
  
- static int Knob_SuccRestrict        = 0;       // Limit successors + spinners to at-most-one
  static int Knob_MaxSpinners         = -1;      // Should be a function of # CPUs
  static int Knob_Bonus               = 100;     // spin success bonus
  static int Knob_BonusB              = 100;     // spin success bonus
  static int Knob_Penalty             = 200;     // spin failure penalty
  static int Knob_Poverty             = 1000;
--- 101,110 ----
*** 1840,1850 ****
    // hold the duration constant but vary the frequency.
  
    ctr = _SpinDuration;
    if (ctr <= 0) return 0;
  
-   if (Knob_SuccRestrict && _succ != NULL) return 0;
    if (Knob_OState && NotRunnable (Self, (Thread *) _owner)) {
      return 0;
    }
  
    int MaxSpin = Knob_MaxSpinners;
--- 1839,1848 ----