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src/hotspot/share/runtime/objectMonitor.cpp

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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

@@ -105,11 +105,10 @@
 
 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_SpinAfterFutile     = 1;       // Spin after returning from park()
 static int Knob_FixedSpin           = 0;
 static int Knob_OState              = 3;       // Spinner checks thread state of _owner
 static int Knob_UsePause            = 1;
 static int Knob_ExitPolicy          = 0;
 static int Knob_PreSpin             = 10;      // 20-100 likely better

@@ -565,11 +564,11 @@
 
     // Assuming this is not a spurious wakeup we'll normally find _succ == Self.
     // We can defer clearing _succ until after the spin completes
     // TrySpin() must tolerate being called with _succ == Self.
     // Try yet another round of adaptive spinning.
-    if ((Knob_SpinAfterFutile & 1) && TrySpin(Self) > 0) break;
+    if (TrySpin(Self) > 0) break;
 
     // We can find that we were unpark()ed and redesignated _succ while
     // we were spinning.  That's harmless.  If we iterate and call park(),
     // park() will consume the event and return immediately and we'll
     // just spin again.  This pattern can repeat, leaving _succ to simply

@@ -657,13 +656,11 @@
 
 // ReenterI() is a specialized inline form of the latter half of the
 // contended slow-path from EnterI().  We use ReenterI() only for
 // monitor reentry in wait().
 //
-// In the future we should reconcile EnterI() and ReenterI(), adding
-// Knob_Reset and Knob_SpinAfterFutile support and restructuring the
-// loop accordingly.
+// In the future we should reconcile EnterI() and ReenterI().
 
 void ObjectMonitor::ReenterI(Thread * Self, ObjectWaiter * SelfNode) {
   assert(Self != NULL, "invariant");
   assert(SelfNode != NULL, "invariant");
   assert(SelfNode->_thread == Self, "invariant");
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