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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

*** 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_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 static int Knob_Penalty = 200; // spin failure penalty --- 101,110 ----
*** 1240,1250 **** // 1. ST _succ = wakee // 2. membar #loadstore|#storestore; // 2. ST _owner = NULL // 3. unpark(wakee) ! _succ = Knob_SuccEnabled ? Wakee->_thread : NULL; ParkEvent * Trigger = Wakee->_event; // Hygiene -- once we've set _owner = NULL we can't safely dereference Wakee again. // The thread associated with Wakee may have grabbed the lock and "Wakee" may be // out-of-scope (non-extant). --- 1239,1249 ---- // 1. ST _succ = wakee // 2. membar #loadstore|#storestore; // 2. ST _owner = NULL // 3. unpark(wakee) ! _succ = Wakee->_thread; ParkEvent * Trigger = Wakee->_event; // Hygiene -- once we've set _owner = NULL we can't safely dereference Wakee again. // The thread associated with Wakee may have grabbed the lock and "Wakee" may be // out-of-scope (non-extant).
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