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
rev 51796 : imported patch syncknobs-16-Knob_MaxSpinners
rev 51797 : imported patch syncknobs-17-Knob_SpinAfterFutile
rev 51798 : imported patch syncknobs-18-Knob_OState
rev 51799 : imported patch syncknobs-19-Knob_UsePause

*** 106,116 ****
  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;
  static int Knob_FixedSpin           = 0;
- static int Knob_UsePause            = 1;
  static int Knob_ExitPolicy          = 0;
  static int Knob_PreSpin             = 10;      // 20-100 likely better
  static int Knob_ResetEvent          = 0;
  
  static int Knob_FastHSSEC           = 0;
--- 106,115 ----
*** 1861,1875 ****
      // We periodically check to see if there's a safepoint pending.
      if ((ctr & 0xFF) == 0) {
        if (SafepointMechanism::poll(Self)) {
          goto Abort;           // abrupt spin egress
        }
!       if (Knob_UsePause & 1) SpinPause();
      }
  
-     if (Knob_UsePause & 2) SpinPause();
- 
      // Probe _owner with TATAS
      // If this thread observes the monitor transition or flicker
      // from locked to unlocked to locked, then the odds that this
      // thread will acquire the lock in this spin attempt go down
      // considerably.  The same argument applies if the CAS fails
--- 1860,1872 ----
      // We periodically check to see if there's a safepoint pending.
      if ((ctr & 0xFF) == 0) {
        if (SafepointMechanism::poll(Self)) {
          goto Abort;           // abrupt spin egress
        }
!       SpinPause();
      }
  
      // Probe _owner with TATAS
      // If this thread observes the monitor transition or flicker
      // from locked to unlocked to locked, then the odds that this
      // thread will acquire the lock in this spin attempt go down
      // considerably.  The same argument applies if the CAS fails