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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
@@ -101,11 +101,10 @@
// 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_SpinEarly = 1;
static int Knob_SuccEnabled = 1; // futile wake throttling
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
@@ -285,11 +284,11 @@
// Try one round of spinning *before* enqueueing Self
// and before going through the awkward and expensive state
// transitions. The following spin is strictly optional ...
// Note that if we acquire the monitor from an initial spin
// we forgo posting JVMTI events and firing DTRACE probes.
- if (Knob_SpinEarly && TrySpin (Self) > 0) {
+ if (TrySpin(Self) > 0) {
assert(_owner == Self, "invariant");
assert(_recursions == 0, "invariant");
assert(((oop)(object()))->mark() == markOopDesc::encode(this), "invariant");
Self->_Stalled = 0;
return;
@@ -447,11 +446,11 @@
// If the _owner is ready but OFFPROC we could use a YieldTo()
// operation to donate the remainder of this thread's quantum
// to the owner. This has subtle but beneficial affinity
// effects.
- if (TrySpin (Self) > 0) {
+ if (TrySpin(Self) > 0) {
assert(_owner == Self, "invariant");
assert(_succ != Self, "invariant");
assert(_Responsible != Self, "invariant");
return;
}
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