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src/hotspot/share/runtime/globals.hpp

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 785           range(min_intx, max_intx)                                         \
 786                                                                             \
 787   product(bool, EagerXrunInit, false,                                       \
 788           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
 789           "but not all -Xrun libraries may support the state of the VM "    \
 790           "at this time")                                                   \
 791                                                                             \
 792   product(bool, PreserveAllAnnotations, false,                              \
 793           "Preserve RuntimeInvisibleAnnotations as well "                   \
 794           "as RuntimeVisibleAnnotations")                                   \
 795                                                                             \
 796   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
 797           "Number of OutOfMemoryErrors preallocated with backtrace")        \
 798                                                                             \
 799   product(bool, UseXMMForArrayCopy, false,                                  \
 800           "Use SSE2 MOVQ instruction for Arraycopy")                        \
 801                                                                             \
 802   notproduct(bool, PrintFieldLayout, false,                                 \
 803           "Print field layout for each class")                              \
 804                                                                             \


















 805   /* Need to limit the extent of the padding to reasonable size.          */\
 806   /* 8K is well beyond the reasonable HW cache line size, even with       */\
 807   /* aggressive prefetching, while still leaving the room for segregating */\
 808   /* among the distinct pages.                                            */\
 809   product(int, ContendedPaddingWidth, 128,                                  \
 810           "How many bytes to pad the fields/classes marked @Contended with")\
 811           range(0, 8192)                                                    \
 812           constraint(ContendedPaddingWidthConstraintFunc,AfterErgo)         \
 813                                                                             \
 814   product(bool, EnableContended, true,                                      \
 815           "Enable @Contended annotation support")                           \
 816                                                                             \
 817   product(bool, RestrictContended, true,                                    \
 818           "Restrict @Contended to trusted classes")                         \
 819                                                                             \
 820   product(int, DiagnoseSyncOnValueBasedClasses, 0, DIAGNOSTIC,              \
 821              "Detect and take action upon identifying synchronization on "  \
 822              "value based classes. Modes: "                                 \
 823              "0: off; "                                                     \
 824              "1: exit with fatal error; "                                   \

1958           "On internal errors, include registers in error report.")         \
1959                                                                             \
1960   product(bool, UseSwitchProfiling, true, DIAGNOSTIC,                       \
1961           "leverage profiling for table/lookup switch")                     \
1962                                                                             \
1963   develop(bool, TraceMemoryWriteback, false,                                \
1964           "Trace memory writeback operations")                              \
1965                                                                             \
1966   JFR_ONLY(product(bool, FlightRecorder, false,                             \
1967           "(Deprecated) Enable Flight Recorder"))                           \
1968                                                                             \
1969   JFR_ONLY(product(ccstr, FlightRecorderOptions, nullptr,                   \
1970           "Flight Recorder options"))                                       \
1971                                                                             \
1972   JFR_ONLY(product(ccstr, StartFlightRecording, nullptr,                    \
1973           "Start flight recording with options"))                           \
1974                                                                             \
1975   product(bool, UseFastUnorderedTimeStamps, false, EXPERIMENTAL,            \
1976           "Use platform unstable time where supported for timestamps only") \
1977                                                                             \























1978   product(bool, UseEmptySlotsInSupers, true,                                \
1979                 "Allow allocating fields in empty slots of super-classes")  \
1980                                                                             \
1981   product(bool, DeoptimizeNMethodBarriersALot, false, DIAGNOSTIC,           \
1982                 "Make nmethod barriers deoptimise a lot.")                  \
1983                                                                             \
1984   develop(bool, VerifyCrossModifyFence,                                     \
1985           false AARCH64_ONLY(DEBUG_ONLY(||true)),                           \
1986              "Mark all threads after a safepoint, and clear on a modify "   \
1987              "fence. Add cleanliness checks.")                              \
1988                                                                             \
1989   product(int, LockingMode, LM_LEGACY,                                      \
1990           "Select locking mode: "                                           \
1991           "0: monitors only (LM_MONITOR), "                                 \
1992           "1: monitors & legacy stack-locking (LM_LEGACY, default), "       \
1993           "2: monitors & new lightweight locking (LM_LIGHTWEIGHT)")         \
1994           range(0, 2)                                                       \
1995                                                                             \
1996   product(uint, TrimNativeHeapInterval, 0, EXPERIMENTAL,                    \
1997           "Interval, in ms, at which the JVM will trim the native heap if " \

 785           range(min_intx, max_intx)                                         \
 786                                                                             \
 787   product(bool, EagerXrunInit, false,                                       \
 788           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
 789           "but not all -Xrun libraries may support the state of the VM "    \
 790           "at this time")                                                   \
 791                                                                             \
 792   product(bool, PreserveAllAnnotations, false,                              \
 793           "Preserve RuntimeInvisibleAnnotations as well "                   \
 794           "as RuntimeVisibleAnnotations")                                   \
 795                                                                             \
 796   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
 797           "Number of OutOfMemoryErrors preallocated with backtrace")        \
 798                                                                             \
 799   product(bool, UseXMMForArrayCopy, false,                                  \
 800           "Use SSE2 MOVQ instruction for Arraycopy")                        \
 801                                                                             \
 802   notproduct(bool, PrintFieldLayout, false,                                 \
 803           "Print field layout for each class")                              \
 804                                                                             \
 805   notproduct(bool, PrintInlineLayout, false,                                \
 806           "Print field layout for each inline type")                        \
 807                                                                             \
 808   notproduct(bool, PrintFlatArrayLayout, false,                             \
 809           "Print array layout for each inline type array")                  \
 810                                                                             \
 811   product(intx, FlatArrayElementMaxSize, -1,                                \
 812           "Max size for flattening inline array elements, <0 no limit")     \
 813                                                                             \
 814   product(intx, InlineFieldMaxFlatSize, 128,                                \
 815           "Max size for flattening inline type fields, <0 no limit")        \
 816                                                                             \
 817   product(intx, FlatArrayElementMaxOops, 4,                                 \
 818           "Max nof embedded object references in an inline type to flatten, <0 no limit")  \
 819                                                                             \
 820   product(bool, InlineArrayAtomicAccess, false,                             \
 821           "Atomic inline array accesses by-default, for all inline arrays") \
 822                                                                             \
 823   /* Need to limit the extent of the padding to reasonable size.          */\
 824   /* 8K is well beyond the reasonable HW cache line size, even with       */\
 825   /* aggressive prefetching, while still leaving the room for segregating */\
 826   /* among the distinct pages.                                            */\
 827   product(int, ContendedPaddingWidth, 128,                                  \
 828           "How many bytes to pad the fields/classes marked @Contended with")\
 829           range(0, 8192)                                                    \
 830           constraint(ContendedPaddingWidthConstraintFunc,AfterErgo)         \
 831                                                                             \
 832   product(bool, EnableContended, true,                                      \
 833           "Enable @Contended annotation support")                           \
 834                                                                             \
 835   product(bool, RestrictContended, true,                                    \
 836           "Restrict @Contended to trusted classes")                         \
 837                                                                             \
 838   product(int, DiagnoseSyncOnValueBasedClasses, 0, DIAGNOSTIC,              \
 839              "Detect and take action upon identifying synchronization on "  \
 840              "value based classes. Modes: "                                 \
 841              "0: off; "                                                     \
 842              "1: exit with fatal error; "                                   \

1976           "On internal errors, include registers in error report.")         \
1977                                                                             \
1978   product(bool, UseSwitchProfiling, true, DIAGNOSTIC,                       \
1979           "leverage profiling for table/lookup switch")                     \
1980                                                                             \
1981   develop(bool, TraceMemoryWriteback, false,                                \
1982           "Trace memory writeback operations")                              \
1983                                                                             \
1984   JFR_ONLY(product(bool, FlightRecorder, false,                             \
1985           "(Deprecated) Enable Flight Recorder"))                           \
1986                                                                             \
1987   JFR_ONLY(product(ccstr, FlightRecorderOptions, nullptr,                   \
1988           "Flight Recorder options"))                                       \
1989                                                                             \
1990   JFR_ONLY(product(ccstr, StartFlightRecording, nullptr,                    \
1991           "Start flight recording with options"))                           \
1992                                                                             \
1993   product(bool, UseFastUnorderedTimeStamps, false, EXPERIMENTAL,            \
1994           "Use platform unstable time where supported for timestamps only") \
1995                                                                             \
1996   product(bool, EnableValhalla, true,                                       \
1997           "Enable experimental Valhalla features")                          \
1998                                                                             \
1999   product(bool, EnablePrimitiveClasses, false,                              \
2000           "Enable experimental Valhalla primitive classes")                 \
2001                                                                             \
2002   product_pd(bool, InlineTypePassFieldsAsArgs,                              \
2003           "Pass each inline type field as an argument at calls")            \
2004                                                                             \
2005   product_pd(bool, InlineTypeReturnedAsFields,                              \
2006           "Return fields instead of an inline type reference")              \
2007                                                                             \
2008   develop(bool, StressCallingConvention, false,                             \
2009           "Stress the scalarized calling convention.")                      \
2010                                                                             \
2011   product(bool, UseArrayMarkWordCheck, NOT_LP64(false) LP64_ONLY(true),     \
2012           "Use bits in the mark word to check for flat/null-free arrays")   \
2013                                                                             \
2014   product(ccstrlist, ForceNonTearable, "", DIAGNOSTIC,                      \
2015           "List of inline classes which are forced to be atomic "           \
2016           "(whitespace and commas separate names, "                         \
2017           "and leading and trailing stars '*' are wildcards)")              \
2018                                                                             \
2019   product(bool, UseEmptySlotsInSupers, true,                                \
2020                 "Allow allocating fields in empty slots of super-classes")  \
2021                                                                             \
2022   product(bool, DeoptimizeNMethodBarriersALot, false, DIAGNOSTIC,           \
2023                 "Make nmethod barriers deoptimise a lot.")                  \
2024                                                                             \
2025   develop(bool, VerifyCrossModifyFence,                                     \
2026           false AARCH64_ONLY(DEBUG_ONLY(||true)),                           \
2027              "Mark all threads after a safepoint, and clear on a modify "   \
2028              "fence. Add cleanliness checks.")                              \
2029                                                                             \
2030   product(int, LockingMode, LM_LEGACY,                                      \
2031           "Select locking mode: "                                           \
2032           "0: monitors only (LM_MONITOR), "                                 \
2033           "1: monitors & legacy stack-locking (LM_LEGACY, default), "       \
2034           "2: monitors & new lightweight locking (LM_LIGHTWEIGHT)")         \
2035           range(0, 2)                                                       \
2036                                                                             \
2037   product(uint, TrimNativeHeapInterval, 0, EXPERIMENTAL,                    \
2038           "Interval, in ms, at which the JVM will trim the native heap if " \
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