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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

@@ -107,11 +107,10 @@
 int ObjectMonitor::Knob_VerifyInUse  = 0;
 int ObjectMonitor::Knob_VerifyMatch  = 0;
 int ObjectMonitor::Knob_SpinLimit    = 5000;    // derived by an external tool -
 
 static int Knob_SpinBase            = 0;       // Floor AKA SpinMin
-static int Knob_SpinBackOff         = 0;       // spin-loop backoff
 static int Knob_CASPenalty          = -1;      // Penalty for failed CAS
 static int Knob_OXPenalty           = -1;      // Penalty for observed _owner change
 static int Knob_SpinSetSucc         = 1;       // spinners set the _succ field
 static int Knob_SpinEarly           = 1;
 static int Knob_SuccEnabled         = 1;       // futile wake throttling

@@ -2213,12 +2212,11 @@
   // One-shot global initialization ...
   // The initialization is idempotent, so we don't need locks.
   // In the future consider doing this via os::init_2().
 
   if (os::is_MP()) {
-    BackOffMask = (1 << Knob_SpinBackOff) - 1;
-    // CONSIDER: BackOffMask = ROUNDUP_NEXT_POWER2 (ncpus-1)
+    BackOffMask = 0;
   } else {
     Knob_SpinLimit = 0;
     Knob_SpinBase  = 0;
     Knob_PreSpin   = 0;
     Knob_FixedSpin = -1;
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