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src/hotspot/share/gc/shared/gc_globals.hpp

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@@ -44,742 +44,642 @@
 #endif
 #if INCLUDE_ZGC
 #include "gc/z/z_globals.hpp"
 #endif
 
-#define GC_FLAGS(develop,                                                   \
-                 develop_pd,                                                \
-                 product,                                                   \
-                 product_pd,                                                \
-                 diagnostic,                                                \
-                 diagnostic_pd,                                             \
-                 experimental,                                              \
-                 notproduct,                                                \
-                 manageable,                                                \
-                 product_rw,                                                \
-                 lp64_product,                                              \
-                 range,                                                     \
-                 constraint)                                                \
-                                                                            \
-  EPSILONGC_ONLY(GC_EPSILON_FLAGS(                                          \
-    develop,                                                                \
-    develop_pd,                                                             \
-    product,                                                                \
-    product_pd,                                                             \
-    diagnostic,                                                             \
-    diagnostic_pd,                                                          \
-    experimental,                                                           \
-    notproduct,                                                             \
-    manageable,                                                             \
-    product_rw,                                                             \
-    lp64_product,                                                           \
-    range,                                                                  \
-    constraint))                                                            \
-                                                                            \
-  G1GC_ONLY(GC_G1_FLAGS(                                                    \
-    develop,                                                                \
-    develop_pd,                                                             \
-    product,                                                                \
-    product_pd,                                                             \
-    diagnostic,                                                             \
-    diagnostic_pd,                                                          \
-    experimental,                                                           \
-    notproduct,                                                             \
-    manageable,                                                             \
-    product_rw,                                                             \
-    lp64_product,                                                           \
-    range,                                                                  \
-    constraint))                                                            \
-                                                                            \
-  PARALLELGC_ONLY(GC_PARALLEL_FLAGS(                                        \
-    develop,                                                                \
-    develop_pd,                                                             \
-    product,                                                                \
-    product_pd,                                                             \
-    diagnostic,                                                             \
-    diagnostic_pd,                                                          \
-    experimental,                                                           \
-    notproduct,                                                             \
-    manageable,                                                             \
-    product_rw,                                                             \
-    lp64_product,                                                           \
-    range,                                                                  \
-    constraint))                                                            \
-                                                                            \
-  SERIALGC_ONLY(GC_SERIAL_FLAGS(                                            \
-    develop,                                                                \
-    develop_pd,                                                             \
-    product,                                                                \
-    product_pd,                                                             \
-    diagnostic,                                                             \
-    diagnostic_pd,                                                          \
-    experimental,                                                           \
-    notproduct,                                                             \
-    manageable,                                                             \
-    product_rw,                                                             \
-    lp64_product,                                                           \
-    range,                                                                  \
-    constraint))                                                            \
-                                                                            \
-  SHENANDOAHGC_ONLY(GC_SHENANDOAH_FLAGS(                                    \
-    develop,                                                                \
-    develop_pd,                                                             \
-    product,                                                                \
-    product_pd,                                                             \
-    diagnostic,                                                             \
-    diagnostic_pd,                                                          \
-    experimental,                                                           \
-    notproduct,                                                             \
-    manageable,                                                             \
-    product_rw,                                                             \
-    lp64_product,                                                           \
-    range,                                                                  \
-    constraint))                                                            \
-                                                                            \
-  ZGC_ONLY(GC_Z_FLAGS(                                                      \
-    develop,                                                                \
-    develop_pd,                                                             \
-    product,                                                                \
-    product_pd,                                                             \
-    diagnostic,                                                             \
-    diagnostic_pd,                                                          \
-    experimental,                                                           \
-    notproduct,                                                             \
-    manageable,                                                             \
-    product_rw,                                                             \
-    lp64_product,                                                           \
-    range,                                                                  \
-    constraint))                                                            \
-                                                                            \
-  /* gc */                                                                  \
-                                                                            \
-  product(bool, UseSerialGC, false,                                         \
-          "Use the Serial garbage collector")                               \
-                                                                            \
-  product(bool, UseG1GC, false,                                             \
-          "Use the Garbage-First garbage collector")                        \
-                                                                            \
-  product(bool, UseParallelGC, false,                                       \
-          "Use the Parallel garbage collector.")                            \
-                                                                            \
-  experimental(bool, UseEpsilonGC, false,                                   \
-          "Use the Epsilon (no-op) garbage collector")                      \
-                                                                            \
-  product(bool, UseZGC, false,                                              \
-          "Use the Z garbage collector")                                    \
-                                                                            \
-  experimental(bool, UseShenandoahGC, false,                                \
-          "Use the Shenandoah garbage collector")                           \
-                                                                            \
-  product(uint, ParallelGCThreads, 0,                                       \
-          "Number of parallel threads parallel gc will use")                \
-          constraint(ParallelGCThreadsConstraintFunc,AfterErgo)             \
-                                                                            \
-  diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true,              \
-            "Use semaphore synchronization for the GC Threads, "            \
-            "instead of synchronization based on mutexes")                  \
-                                                                            \
-  product(bool, UseDynamicNumberOfGCThreads, true,                          \
-          "Dynamically choose the number of threads up to a maximum of "    \
-          "ParallelGCThreads parallel collectors will use for garbage "     \
-          "collection work")                                                \
-                                                                            \
-  diagnostic(bool, InjectGCWorkerCreationFailure, false,                    \
-             "Inject thread creation failures for "                         \
-             "UseDynamicNumberOfGCThreads")                                 \
-                                                                            \
-  product(size_t, HeapSizePerGCThread, ScaleForWordSize(32*M),              \
-          "Size of heap (bytes) per GC thread used in calculating the "     \
-          "number of GC threads")                                           \
-          range((size_t)os::vm_page_size(), (size_t)max_uintx)              \
-                                                                            \
-  product(uint, ConcGCThreads, 0,                                           \
-          "Number of threads concurrent gc will use")                       \
-          constraint(ConcGCThreadsConstraintFunc,AfterErgo)                 \
-                                                                            \
-  product(bool, AlwaysTenure, false,                                        \
-          "Always tenure objects in eden (ParallelGC only)")                \
-                                                                            \
-  product(bool, NeverTenure, false,                                         \
-          "Never tenure objects in eden, may tenure on overflow "           \
-          "(ParallelGC only)")                                              \
-                                                                            \
-  product(bool, ScavengeBeforeFullGC, true,                                 \
-          "Scavenge youngest generation before each full GC.")              \
-                                                                            \
-  product(bool, ExplicitGCInvokesConcurrent, false,                         \
-          "A System.gc() request invokes a concurrent collection; "         \
-          "(effective only when using concurrent collectors)")              \
-                                                                            \
-  product(uintx, GCLockerEdenExpansionPercent, 5,                           \
-          "How much the GC can expand the eden by while the GC locker "     \
-          "is active (as a percentage)")                                    \
-          range(0, 100)                                                     \
-                                                                            \
-  diagnostic(uintx, GCLockerRetryAllocationCount, 2,                        \
-          "Number of times to retry allocations when "                      \
-          "blocked by the GC locker")                                       \
-          range(0, max_uintx)                                               \
-                                                                            \
-  product(uintx, ParallelGCBufferWastePct, 10,                              \
-          "Wasted fraction of parallel allocation buffer")                  \
-          range(0, 100)                                                     \
-                                                                            \
-  product(uintx, TargetPLABWastePct, 10,                                    \
-          "Target wasted space in last buffer as percent of overall "       \
-          "allocation")                                                     \
-          range(1, 100)                                                     \
-                                                                            \
-  product(uintx, PLABWeight, 75,                                            \
-          "Percentage (0-100) used to weight the current sample when "      \
-          "computing exponentially decaying average for ResizePLAB")        \
-          range(0, 100)                                                     \
-                                                                            \
-  product(bool, ResizePLAB, true,                                           \
-          "Dynamically resize (survivor space) promotion LAB's")            \
-                                                                            \
-  product(int, ParGCArrayScanChunk, 50,                                     \
-          "Scan a subset of object array and push remainder, if array is "  \
-          "bigger than this")                                               \
-          range(1, max_jint/3)                                              \
-                                                                            \
-                                                                            \
-  product(bool, AlwaysPreTouch, false,                                      \
-          "Force all freshly committed pages to be pre-touched")            \
-                                                                            \
-  product(size_t, PreTouchParallelChunkSize, 1 * G,                         \
-          "Per-thread chunk size for parallel memory pre-touch.")           \
-          range(1, SIZE_MAX / 2)                                            \
-                                                                            \
-  /* where does the range max value of (max_jint - 1) come from? */         \
-  product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),         \
-          "Maximum size of marking stack")                                  \
-          range(1, (max_jint - 1))                                          \
-                                                                            \
-  product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),             \
-          "Size of marking stack")                                          \
-          constraint(MarkStackSizeConstraintFunc,AfterErgo)                 \
-          range(1, (max_jint - 1))                                          \
-                                                                            \
-  product(intx, RefDiscoveryPolicy, 0,                                      \
-          "Select type of reference discovery policy: "                     \
-          "reference-based(0) or referent-based(1)")                        \
-          range(ReferenceProcessor::DiscoveryPolicyMin,                     \
-                ReferenceProcessor::DiscoveryPolicyMax)                     \
-                                                                            \
-  product(bool, ParallelRefProcEnabled, false,                              \
-          "Enable parallel reference processing whenever possible")         \
-                                                                            \
-  product(bool, ParallelRefProcBalancingEnabled, true,                      \
-          "Enable balancing of reference processing queues")                \
-                                                                            \
-  experimental(size_t, ReferencesPerThread, 1000,                           \
-               "Ergonomically start one thread for this amount of "         \
-               "references for reference processing if "                    \
-               "ParallelRefProcEnabled is true. Specify 0 to disable and "  \
-               "use all threads.")                                          \
-                                                                            \
-  product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
-          "The percent occupancy (IHOP) of the current old generation "     \
-          "capacity above which a concurrent mark cycle will be initiated " \
-          "Its value may change over time if adaptive IHOP is enabled, "    \
-          "otherwise the value remains constant. "                          \
-          "In the latter case a value of 0 will result as frequent as "     \
-          "possible concurrent marking cycles. A value of 100 disables "    \
-          "concurrent marking. "                                            \
-          "Fragmentation waste in the old generation is not considered "    \
-          "free space in this calculation. (G1 collector only)")            \
-          range(0, 100)                                                     \
-                                                                            \
-  notproduct(bool, ScavengeALot, false,                                     \
-          "Force scavenge at every Nth exit from the runtime system "       \
-          "(N=ScavengeALotInterval)")                                       \
-                                                                            \
-  develop(bool, FullGCALot, false,                                          \
-          "Force full gc at every Nth exit from the runtime system "        \
-          "(N=FullGCALotInterval)")                                         \
-                                                                            \
-  notproduct(bool, GCALotAtAllSafepoints, false,                            \
-          "Enforce ScavengeALot/GCALot at all potential safepoints")        \
-                                                                            \
-  notproduct(bool, PromotionFailureALot, false,                             \
-          "Use promotion failure handling on every youngest generation "    \
-          "collection")                                                     \
-                                                                            \
-  develop(uintx, PromotionFailureALotCount, 1000,                           \
-          "Number of promotion failures occurring at PLAB promotion "       \
-          "attempts at young collectors")                                   \
-                                                                            \
-  develop(uintx, PromotionFailureALotInterval, 5,                           \
-          "Total collections between promotion failures a lot")             \
-                                                                            \
-  experimental(uintx, WorkStealingSleepMillis, 1,                           \
-          "Sleep time when sleep is used for yields")                       \
-                                                                            \
-  experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
-          "Number of yields before a sleep is done during work stealing")   \
-                                                                            \
-  experimental(uintx, WorkStealingHardSpins, 4096,                          \
-          "Number of iterations in a spin loop between checks on "          \
-          "time out of hard spin")                                          \
-                                                                            \
-  experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
-          "Ratio of hard spins to calls to yield")                          \
-                                                                            \
-  develop(uintx, ObjArrayMarkingStride, 2048,                               \
-          "Number of object array elements to push onto the marking stack " \
-          "before pushing a continuation entry")                            \
-                                                                            \
-  develop(bool, MetadataAllocationFailALot, false,                          \
-          "Fail metadata allocations at intervals controlled by "           \
-          "MetadataAllocationFailALotInterval")                             \
-                                                                            \
-  develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
-          "Metadata allocation failure a lot interval")                     \
-                                                                            \
-  product(bool, ExecutingUnitTests, false,                                  \
-          "Whether the JVM is running unit tests or not")                   \
-                                                                            \
-  product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
-                                                                            \
-  product_pd(bool, ResizeTLAB,                                              \
-          "Dynamically resize TLAB size for threads")                       \
-                                                                            \
-  product(bool, ZeroTLAB, false,                                            \
-          "Zero out the newly created TLAB")                                \
-                                                                            \
-  product(bool, TLABStats, true,                                            \
-          "Provide more detailed and expensive TLAB statistics.")           \
-                                                                            \
-  product_pd(bool, NeverActAsServerClassMachine,                            \
-          "Never act like a server-class machine")                          \
-                                                                            \
-  product(bool, AlwaysActAsServerClassMachine, false,                       \
-          "Always act like a server-class machine")                         \
-                                                                            \
-  product_pd(uint64_t, MaxRAM,                                              \
-          "Real memory size (in bytes) used to set maximum heap size")      \
-          range(0, 0XFFFFFFFFFFFFFFFF)                                      \
-                                                                            \
-  product(bool, AggressiveHeap, false,                                      \
-          "Optimize heap options for long-running memory intensive apps")   \
-                                                                            \
-  product(size_t, ErgoHeapSizeLimit, 0,                                     \
-          "Maximum ergonomically set heap size (in bytes); zero means use " \
-          "MaxRAM * MaxRAMPercentage / 100")                                \
-          range(0, max_uintx)                                               \
-                                                                            \
-  product(uintx, MaxRAMFraction, 4,                                         \
-          "Maximum fraction (1/n) of real memory used for maximum heap "    \
-          "size. "                                                          \
-          "Deprecated, use MaxRAMPercentage instead")                       \
-          range(1, max_uintx)                                               \
-                                                                            \
-  product(uintx, MinRAMFraction, 2,                                         \
-          "Minimum fraction (1/n) of real memory used for maximum heap "    \
-          "size on systems with small physical memory size. "               \
-          "Deprecated, use MinRAMPercentage instead")                       \
-          range(1, max_uintx)                                               \
-                                                                            \
-  product(uintx, InitialRAMFraction, 64,                                    \
-          "Fraction (1/n) of real memory used for initial heap size. "      \
-          "Deprecated, use InitialRAMPercentage instead")                   \
-          range(1, max_uintx)                                               \
-                                                                            \
-  product(double, MaxRAMPercentage, 25.0,                                   \
-          "Maximum percentage of real memory used for maximum heap size")   \
-          range(0.0, 100.0)                                                 \
-                                                                            \
-  product(double, MinRAMPercentage, 50.0,                                   \
-          "Minimum percentage of real memory used for maximum heap"         \
-          "size on systems with small physical memory size")                \
-          range(0.0, 100.0)                                                 \
-                                                                            \
-  product(double, InitialRAMPercentage, 1.5625,                             \
-          "Percentage of real memory used for initial heap size")           \
-          range(0.0, 100.0)                                                 \
-                                                                            \
-  product(int, ActiveProcessorCount, -1,                                    \
-          "Specify the CPU count the VM should use and report as active")   \
-                                                                            \
-  develop(uintx, MaxVirtMemFraction, 2,                                     \
-          "Maximum fraction (1/n) of virtual memory used for ergonomically "\
-          "determining maximum heap size")                                  \
-                                                                            \
-  product(bool, UseAdaptiveSizePolicy, true,                                \
-          "Use adaptive generation sizing policies")                        \
-                                                                            \
-  product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
-          "Use adaptive survivor sizing policies")                          \
-                                                                            \
-  product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
-          "Use adaptive young-old sizing policies at minor collections")    \
-                                                                            \
-  product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
-          "Use adaptive young-old sizing policies at major collections")    \
-                                                                            \
-  product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
-          "Include statistics from System.gc() for adaptive size policy")   \
-                                                                            \
-  product(bool, UseAdaptiveGCBoundary, false,                               \
-          "Allow young-old boundary to move")                               \
-                                                                            \
-  develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
-          "Resize the virtual spaces of the young or old generations")      \
-          range(-1, 1)                                                      \
-                                                                            \
-  product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
-          "Policy for changing generation size for throughput goals")       \
-          range(0, 1)                                                       \
-                                                                            \
-  product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
-          "Number of steps where heuristics is used before data is used")   \
-          range(0, max_uintx)                                               \
-                                                                            \
-  develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
-          "Number of collections before the adaptive sizing is started")    \
-                                                                            \
-  product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
-          "Collection interval for printing information; zero means never") \
-          range(0, max_uintx)                                               \
-                                                                            \
-  product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
-          "Use adaptive minimum footprint as a goal")                       \
-                                                                            \
-  product(uintx, AdaptiveSizePolicyWeight, 10,                              \
-          "Weight given to exponential resizing, between 0 and 100")        \
-          range(0, 100)                                                     \
-                                                                            \
-  product(uintx, AdaptiveTimeWeight,       25,                              \
-          "Weight given to time in adaptive policy, between 0 and 100")     \
-          range(0, 100)                                                     \
-                                                                            \
-  product(uintx, PausePadding, 1,                                           \
-          "How much buffer to keep for pause time")                         \
-          range(0, max_juint)                                               \
-                                                                            \
-  product(uintx, PromotedPadding, 3,                                        \
-          "How much buffer to keep for promotion failure")                  \
-          range(0, max_juint)                                               \
-                                                                            \
-  product(uintx, SurvivorPadding, 3,                                        \
-          "How much buffer to keep for survivor overflow")                  \
-          range(0, max_juint)                                               \
-                                                                            \
-  product(uintx, ThresholdTolerance, 10,                                    \
-          "Allowed collection cost difference between generations")         \
-          range(0, 100)                                                     \
-                                                                            \
-  product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
-          "If collection costs are within margin, reduce both by full "     \
-          "delta")                                                          \
-          range(0, 100)                                                     \
-                                                                            \
-  product(uintx, YoungGenerationSizeIncrement, 20,                          \
-          "Adaptive size percentage change in young generation")            \
-          range(0, 100)                                                     \
-                                                                            \
-  product(uintx, YoungGenerationSizeSupplement, 80,                         \
-          "Supplement to YoungedGenerationSizeIncrement used at startup")   \
-          range(0, 100)                                                     \
-                                                                            \
-  product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
-          "Decay factor to YoungedGenerationSizeSupplement")                \
-          range(1, max_uintx)                                               \
-                                                                            \
-  product(uintx, TenuredGenerationSizeIncrement, 20,                        \
-          "Adaptive size percentage change in tenured generation")          \
-          range(0, 100)                                                     \
-                                                                            \
-  product(uintx, TenuredGenerationSizeSupplement, 80,                       \
-          "Supplement to TenuredGenerationSizeIncrement used at startup")   \
-          range(0, 100)                                                     \
-                                                                            \
-  product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
-          "Decay factor to TenuredGenerationSizeIncrement")                 \
-          range(1, max_uintx)                                               \
-                                                                            \
-  product(uintx, MaxGCPauseMillis, max_uintx - 1,                           \
-          "Adaptive size policy maximum GC pause time goal in millisecond, "\
-          "or (G1 Only) the maximum GC time per MMU time slice")            \
-          range(1, max_uintx - 1)                                           \
-          constraint(MaxGCPauseMillisConstraintFunc,AfterErgo)              \
-                                                                            \
-  product(uintx, GCPauseIntervalMillis, 0,                                  \
-          "Time slice for MMU specification")                               \
-          constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo)         \
-                                                                            \
-  product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
-          "Adaptive size policy maximum GC minor pause time goal "          \
-          "in millisecond")                                                 \
-          range(0, max_uintx)                                               \
-                                                                            \
-  product(uintx, GCTimeRatio, 99,                                           \
-          "Adaptive size policy application time to GC time ratio")         \
-          range(0, max_juint)                                               \
-                                                                            \
-  product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
-          "Adaptive size scale down factor for shrinking")                  \
-          range(1, max_uintx)                                               \
-                                                                            \
-  product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
-          "Adaptive size decays the major cost for long major intervals")   \
-                                                                            \
-  product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
-          "Time scale over which major costs decay")                        \
-          range(0, max_uintx)                                               \
-                                                                            \
-  product(uintx, MinSurvivorRatio, 3,                                       \
-          "Minimum ratio of young generation/survivor space size")          \
-          range(3, max_uintx)                                               \
-                                                                            \
-  product(uintx, InitialSurvivorRatio, 8,                                   \
-          "Initial ratio of young generation/survivor space size")          \
-          range(0, max_uintx)                                               \
-                                                                            \
-  product(size_t, BaseFootPrintEstimate, 256*M,                             \
-          "Estimate of footprint other than Java Heap")                     \
-          range(0, max_uintx)                                               \
-                                                                            \
-  product(bool, UseGCOverheadLimit, true,                                   \
-          "Use policy to limit of proportion of time spent in GC "          \
-          "before an OutOfMemory error is thrown")                          \
-                                                                            \
-  product(uintx, GCTimeLimit, 98,                                           \
-          "Limit of the proportion of time spent in GC before "             \
-          "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)")      \
-          range(0, 100)                                                     \
-                                                                            \
-  product(uintx, GCHeapFreeLimit, 2,                                        \
-          "Minimum percentage of free space after a full GC before an "     \
-          "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
-          range(0, 100)                                                     \
-                                                                            \
-  develop(uintx, GCOverheadLimitThreshold, 5,                               \
-          "Number of consecutive collections before gc time limit fires")   \
-          range(1, max_uintx)                                               \
-                                                                            \
-  product(intx, PrefetchCopyIntervalInBytes, -1,                            \
-          "How far ahead to prefetch destination area (<= 0 means off)")    \
-          range(-1, max_jint)                                               \
-                                                                            \
-  product(intx, PrefetchScanIntervalInBytes, -1,                            \
-          "How far ahead to prefetch scan area (<= 0 means off)")           \
-          range(-1, max_jint)                                               \
-                                                                            \
-  product(intx, PrefetchFieldsAhead, -1,                                    \
-          "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
-          range(-1, max_jint)                                               \
-                                                                            \
-  diagnostic(bool, VerifyDuringStartup, false,                              \
-          "Verify memory system before executing any Java code "            \
-          "during VM initialization")                                       \
-                                                                            \
-  diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
-          "Verify system before exiting")                                   \
-                                                                            \
-  diagnostic(bool, VerifyBeforeGC, false,                                   \
-          "Verify memory system before GC")                                 \
-                                                                            \
-  diagnostic(bool, VerifyAfterGC, false,                                    \
-          "Verify memory system after GC")                                  \
-                                                                            \
-  diagnostic(bool, VerifyDuringGC, false,                                   \
-          "Verify memory system during GC (between phases)")                \
-                                                                            \
-  diagnostic(ccstrlist, VerifyGCType, "",                                   \
-             "GC type(s) to verify when Verify*GC is enabled."              \
-             "Available types are collector specific.")                     \
-                                                                            \
-  diagnostic(ccstrlist, VerifySubSet, "",                                   \
-          "Memory sub-systems to verify when Verify*GC flag(s) "            \
-          "are enabled. One or more sub-systems can be specified "          \
-          "in a comma separated string. Sub-systems are: "                  \
-          "threads, heap, symbol_table, string_table, codecache, "          \
-          "dictionary, classloader_data_graph, metaspace, jni_handles, "    \
-          "codecache_oops")                                                 \
-                                                                            \
-  diagnostic(bool, GCParallelVerificationEnabled, true,                     \
-          "Enable parallel memory system verification")                     \
-                                                                            \
-  diagnostic(bool, DeferInitialCardMark, false,                             \
-          "When +ReduceInitialCardMarks, explicitly defer any that "        \
-          "may arise from new_pre_store_barrier")                           \
-                                                                            \
-  product(bool, UseCondCardMark, false,                                     \
-          "Check for already marked card before updating card table")       \
-                                                                            \
-  diagnostic(bool, VerifyRememberedSets, false,                             \
-          "Verify GC remembered sets")                                      \
-                                                                            \
-  diagnostic(bool, VerifyObjectStartArray, true,                            \
-          "Verify GC object start array if verify before/after")            \
-                                                                            \
-  product(bool, DisableExplicitGC, false,                                   \
-          "Ignore calls to System.gc()")                                    \
-                                                                            \
-  product(bool, PrintGC, false,                                             \
-          "Print message at garbage collection. "                           \
-          "Deprecated, use -Xlog:gc instead.")                              \
-                                                                            \
-  product(bool, PrintGCDetails, false,                                      \
-          "Print more details at garbage collection. "                      \
-          "Deprecated, use -Xlog:gc* instead.")                             \
-                                                                            \
-  develop(intx, ConcGCYieldTimeout, 0,                                      \
-          "If non-zero, assert that GC threads yield within this "          \
-          "number of milliseconds")                                         \
-          range(0, max_intx)                                                \
-                                                                            \
-  notproduct(intx, ScavengeALotInterval,     1,                             \
-          "Interval between which scavenge will occur with +ScavengeALot")  \
-                                                                            \
-  notproduct(intx, FullGCALotInterval,     1,                               \
-          "Interval between which full gc will occur with +FullGCALot")     \
-                                                                            \
-  notproduct(intx, FullGCALotStart,     0,                                  \
-          "For which invocation to start FullGCAlot")                       \
-                                                                            \
-  notproduct(intx, FullGCALotDummies,  32*K,                                \
-          "Dummy object allocated with +FullGCALot, forcing all objects "   \
-          "to move")                                                        \
-                                                                            \
-  /* gc parameters */                                                       \
-  product(size_t, MinHeapSize, 0,                                           \
-          "Minimum heap size (in bytes); zero means use ergonomics")        \
-          constraint(MinHeapSizeConstraintFunc,AfterErgo)                   \
-                                                                            \
-  product(size_t, InitialHeapSize, 0,                                       \
-          "Initial heap size (in bytes); zero means use ergonomics")        \
-          constraint(InitialHeapSizeConstraintFunc,AfterErgo)               \
-                                                                            \
-  product(size_t, MaxHeapSize, ScaleForWordSize(96*M),                      \
-          "Maximum heap size (in bytes)")                                   \
-          constraint(MaxHeapSizeConstraintFunc,AfterErgo)                   \
-                                                                            \
-  manageable(size_t, SoftMaxHeapSize, 0,                                    \
-          "Soft limit for maximum heap size (in bytes)")                    \
-          constraint(SoftMaxHeapSizeConstraintFunc,AfterMemoryInit)         \
-                                                                            \
-  product(size_t, OldSize, ScaleForWordSize(4*M),                           \
-          "Initial tenured generation size (in bytes)")                     \
-          range(0, max_uintx)                                               \
-                                                                            \
-  product(size_t, NewSize, ScaleForWordSize(1*M),                           \
-          "Initial new generation size (in bytes)")                         \
-          constraint(NewSizeConstraintFunc,AfterErgo)                       \
-                                                                            \
-  product(size_t, MaxNewSize, max_uintx,                                    \
-          "Maximum new generation size (in bytes), max_uintx means set "    \
-          "ergonomically")                                                  \
-          range(0, max_uintx)                                               \
-                                                                            \
-  product_pd(size_t, HeapBaseMinAddress,                                    \
-          "OS specific low limit for heap base address")                    \
-          constraint(HeapBaseMinAddressConstraintFunc,AfterErgo)            \
-                                                                            \
-  product(size_t, PretenureSizeThreshold, 0,                                \
-          "Maximum size in bytes of objects allocated in DefNew "           \
-          "generation; zero means no maximum")                              \
-          range(0, max_uintx)                                               \
-                                                                            \
-  product(size_t, MinTLABSize, 2*K,                                         \
-          "Minimum allowed TLAB size (in bytes)")                           \
-          range(1, max_uintx/2)                                             \
-          constraint(MinTLABSizeConstraintFunc,AfterMemoryInit)             \
-                                                                            \
-  product(size_t, TLABSize, 0,                                              \
-          "Starting TLAB size (in bytes); zero means set ergonomically")    \
-          constraint(TLABSizeConstraintFunc,AfterMemoryInit)                \
-                                                                            \
-  product(size_t, YoungPLABSize, 4096,                                      \
-          "Size of young gen promotion LAB's (in HeapWords)")               \
-          constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit)           \
-                                                                            \
-  product(size_t, OldPLABSize, 1024,                                        \
-          "Size of old gen promotion LAB's (in HeapWords)")                 \
-          constraint(OldPLABSizeConstraintFunc,AfterMemoryInit)             \
-                                                                            \
-  product(uintx, TLABAllocationWeight, 35,                                  \
-          "Allocation averaging weight")                                    \
-          range(0, 100)                                                     \
-                                                                            \
-  /* Limit the lower bound of this flag to 1 as it is used  */              \
-  /* in a division expression.                              */              \
-  product(uintx, TLABWasteTargetPercent, 1,                                 \
-          "Percentage of Eden that can be wasted")                          \
-          range(1, 100)                                                     \
-                                                                            \
-  product(uintx, TLABRefillWasteFraction,    64,                            \
-          "Maximum TLAB waste at a refill (internal fragmentation)")        \
-          range(1, max_juint)                                               \
-                                                                            \
-  product(uintx, TLABWasteIncrement,    4,                                  \
-          "Increment allowed waste at slow allocation")                     \
-          range(0, max_jint)                                                \
-          constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit)      \
-                                                                            \
-  product(uintx, SurvivorRatio, 8,                                          \
-          "Ratio of eden/survivor space size")                              \
-          range(1, max_uintx-2)                                             \
-          constraint(SurvivorRatioConstraintFunc,AfterMemoryInit)           \
-                                                                            \
-  product(uintx, NewRatio, 2,                                               \
-          "Ratio of old/new generation sizes")                              \
-          range(0, max_uintx-1)                                             \
-                                                                            \
-  product_pd(size_t, NewSizeThreadIncrease,                                 \
-          "Additional size added to desired new generation size per "       \
-          "non-daemon thread (in bytes)")                                   \
-          range(0, max_uintx)                                               \
-                                                                            \
-  product(uintx, QueuedAllocationWarningCount, 0,                           \
-          "Number of times an allocation that queues behind a GC "          \
-          "will retry before printing a warning")                           \
-          range(0, max_uintx)                                               \
-                                                                            \
-  diagnostic(uintx, VerifyGCStartAt,   0,                                   \
-          "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
-          range(0, max_uintx)                                               \
-                                                                            \
-  diagnostic(intx, VerifyGCLevel,     0,                                    \
-          "Generation level at which to start +VerifyBefore/AfterGC")       \
-          range(0, 1)                                                       \
-                                                                            \
-  product(uintx, MaxTenuringThreshold,    15,                               \
-          "Maximum value for tenuring threshold")                           \
-          range(0, markWord::max_age + 1)                                   \
-          constraint(MaxTenuringThresholdConstraintFunc,AfterErgo)          \
-                                                                            \
-  product(uintx, InitialTenuringThreshold,    7,                            \
-          "Initial value for tenuring threshold")                           \
-          range(0, markWord::max_age + 1)                                   \
-          constraint(InitialTenuringThresholdConstraintFunc,AfterErgo)      \
-                                                                            \
-  product(uintx, TargetSurvivorRatio,    50,                                \
-          "Desired percentage of survivor space used after scavenge")       \
-          range(0, 100)                                                     \
-                                                                            \
-  product(uintx, MarkSweepDeadRatio,     5,                                 \
-          "Percentage (0-100) of the old gen allowed as dead wood. "        \
-          "Serial mark sweep treats this as both the minimum and maximum "  \
-          "value. "                                                         \
-          "Par compact uses a variable scale based on the density of the "  \
-          "generation and treats this as the maximum value when the heap "  \
-          "is either completely full or completely empty.  Par compact "    \
-          "also has a smaller default value; see arguments.cpp.")           \
-          range(0, 100)                                                     \
-                                                                            \
-  product(uint, MarkSweepAlwaysCompactCount,     4,                         \
-          "How often should we fully compact the heap (ignoring the dead "  \
-          "space parameters)")                                              \
-          range(1, max_juint)                                               \
-                                                                            \
-  develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
-          "Delay between expansion and allocation (in milliseconds)")       \
-                                                                            \
-  product(uintx, GCDrainStackTargetSize, 64,                                \
-          "Number of entries we will try to leave on the stack "            \
-          "during parallel gc")                                             \
-          range(0, max_juint)
+#include "runtime/flags/jvmFlag.hpp"
+PRODUCT_FLAG(bool,     UseSerialGC, false, JVMFlag::DEFAULT,
+                       "Use the Serial garbage collector");
+
+PRODUCT_FLAG(bool,     UseG1GC, false, JVMFlag::DEFAULT,
+                       "Use the Garbage-First garbage collector");
+
+PRODUCT_FLAG(bool,     UseParallelGC, false, JVMFlag::DEFAULT,
+                       "Use the Parallel garbage collector.");
+
+PRODUCT_FLAG(bool,     UseEpsilonGC, false, JVMFlag::EXPERIMENTAL,
+                       "Use the Epsilon (no-op) garbage collector");
+
+PRODUCT_FLAG(bool,     UseZGC, false, JVMFlag::DEFAULT,
+                       "Use the Z garbage collector");
+
+PRODUCT_FLAG(bool,     UseShenandoahGC, false, JVMFlag::EXPERIMENTAL,
+                       "Use the Shenandoah garbage collector");
+
+PRODUCT_FLAG(uint,     ParallelGCThreads, 0, JVMFlag::CONSTRAINT,
+                       "Number of parallel threads parallel gc will use");
+   FLAG_CONSTRAINT(    ParallelGCThreads, (void*)ParallelGCThreadsConstraintFunc, JVMFlag::AfterErgo);
+
+PRODUCT_FLAG(bool,     UseSemaphoreGCThreadsSynchronization, true, JVMFlag::DIAGNOSTIC,
+                       "Use semaphore synchronization for the GC Threads, "
+                       "instead of synchronization based on mutexes");
+
+PRODUCT_FLAG(bool,     UseDynamicNumberOfGCThreads, true, JVMFlag::DEFAULT,
+                       "Dynamically choose the number of threads up to a maximum of "
+                       "ParallelGCThreads parallel collectors will use for garbage "
+                       "collection work");
+
+PRODUCT_FLAG(bool,     InjectGCWorkerCreationFailure, false, JVMFlag::DIAGNOSTIC,
+                       "Inject thread creation failures for "
+                       "UseDynamicNumberOfGCThreads");
+
+PRODUCT_FLAG(size_t,   HeapSizePerGCThread, ScaleForWordSize(32*M), JVMFlag::RANGE,
+                       "Size of heap (bytes) per GC thread used in calculating the "
+                       "number of GC threads");
+   FLAG_CUSTOM_RANGE(  HeapSizePerGCThread, VMPageSize);
+
+PRODUCT_FLAG(uint,     ConcGCThreads, 0, JVMFlag::CONSTRAINT,
+                       "Number of threads concurrent gc will use");
+   FLAG_CONSTRAINT(    ConcGCThreads, (void*)ConcGCThreadsConstraintFunc, JVMFlag::AfterErgo);
+
+PRODUCT_FLAG(bool,     AlwaysTenure, false, JVMFlag::DEFAULT,
+                       "Always tenure objects in eden (ParallelGC only)");
+
+PRODUCT_FLAG(bool,     NeverTenure, false, JVMFlag::DEFAULT,
+                       "Never tenure objects in eden, may tenure on overflow "
+                       "(ParallelGC only)");
+
+PRODUCT_FLAG(bool,     ScavengeBeforeFullGC, true, JVMFlag::DEFAULT,
+                       "Scavenge youngest generation before each full GC.");
+
+PRODUCT_FLAG(bool,     ExplicitGCInvokesConcurrent, false, JVMFlag::DEFAULT,
+                       "A System.gc() request invokes a concurrent collection; "
+                       "(effective only when using concurrent collectors)");
+
+PRODUCT_FLAG(uintx,    GCLockerEdenExpansionPercent, 5, JVMFlag::RANGE,
+                       "How much the GC can expand the eden by while the GC locker "
+                       "is active (as a percentage)");
+   FLAG_RANGE(         GCLockerEdenExpansionPercent, 0, 100);
+
+PRODUCT_FLAG(uintx,    GCLockerRetryAllocationCount, 2, JVMFlag::DIAGNOSTIC | JVMFlag::RANGE,
+                       "Number of times to retry allocations when "
+                       "blocked by the GC locker");
+   FLAG_RANGE(         GCLockerRetryAllocationCount, 0, max_uintx);
+
+PRODUCT_FLAG(uintx,    ParallelGCBufferWastePct, 10, JVMFlag::RANGE,
+                       "Wasted fraction of parallel allocation buffer");
+   FLAG_RANGE(         ParallelGCBufferWastePct, 0, 100);
+
+PRODUCT_FLAG(uintx,    TargetPLABWastePct, 10, JVMFlag::RANGE,
+                       "Target wasted space in last buffer as percent of overall "
+                       "allocation");
+   FLAG_RANGE(         TargetPLABWastePct, 1, 100);
+
+PRODUCT_FLAG(uintx,    PLABWeight, 75, JVMFlag::RANGE,
+                       "Percentage (0-100) used to weight the current sample when "
+                       "computing exponentially decaying average for ResizePLAB");
+   FLAG_RANGE(         PLABWeight, 0, 100);
+
+PRODUCT_FLAG(bool,     ResizePLAB, true, JVMFlag::DEFAULT,
+                       "Dynamically resize (survivor space) promotion LAB's");
+
+PRODUCT_FLAG(int,      ParGCArrayScanChunk, 50, JVMFlag::RANGE,
+                       "Scan a subset of object array and push remainder, if array is "
+                       "bigger than this");
+   FLAG_RANGE(         ParGCArrayScanChunk, 1, max_jint/3);
+
+PRODUCT_FLAG(bool,     AlwaysPreTouch, false, JVMFlag::DEFAULT,
+                       "Force all freshly committed pages to be pre-touched");
+
+PRODUCT_FLAG(size_t,   PreTouchParallelChunkSize, 1 * G, JVMFlag::RANGE,
+                       "Per-thread chunk size for parallel memory pre-touch.");
+   FLAG_RANGE(         PreTouchParallelChunkSize, 1, SIZE_MAX / 2);
+
+
+    //  where does the range max value of (max_jint - 1) come from? 
+PRODUCT_FLAG(size_t,   MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), JVMFlag::RANGE,
+                       "Maximum size of marking stack");
+   FLAG_RANGE(         MarkStackSizeMax, 1, (max_jint - 1));
+
+PRODUCT_FLAG(size_t,   MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), JVMFlag::RANGE | JVMFlag::CONSTRAINT,
+                       "Size of marking stack");
+   FLAG_RANGE(         MarkStackSize, 1, (max_jint - 1));
+   FLAG_CONSTRAINT(    MarkStackSize, (void*)MarkStackSizeConstraintFunc, JVMFlag::AfterErgo);
+
+PRODUCT_FLAG(intx,     RefDiscoveryPolicy, 0, JVMFlag::RANGE,
+                       "Select type of reference discovery policy: "
+                       "reference-based(0) or referent-based(1)");
+ //TODO: to avoid circular dependency, the min/max cannot be declared in header file
+ //FLAG_RANGE(         RefDiscoveryPolicy, ReferenceProcessor::DiscoveryPolicyMin,ReferenceProcessor::DiscoveryPolicyMax);
+
+PRODUCT_FLAG(bool,     ParallelRefProcEnabled, false, JVMFlag::DEFAULT,
+                       "Enable parallel reference processing whenever possible");
+
+PRODUCT_FLAG(bool,     ParallelRefProcBalancingEnabled, true, JVMFlag::DEFAULT,
+                       "Enable balancing of reference processing queues");
+
+PRODUCT_FLAG(size_t,   ReferencesPerThread, 1000, JVMFlag::EXPERIMENTAL,
+                       "Ergonomically start one thread for this amount of "
+                       "references for reference processing if "
+                       "ParallelRefProcEnabled is true. Specify 0 to disable and "
+                       "use all threads.");
+
+PRODUCT_FLAG(uintx,    InitiatingHeapOccupancyPercent, 45, JVMFlag::RANGE,
+                       "The percent occupancy (IHOP) of the current old generation "
+                       "capacity above which a concurrent mark cycle will be initiated "
+                       "Its value may change over time if adaptive IHOP is enabled, "
+                       "otherwise the value remains constant. "
+                       "In the latter case a value of 0 will result as frequent as "
+                       "possible concurrent marking cycles. A value of 100 disables "
+                       "concurrent marking. "
+                       "Fragmentation waste in the old generation is not considered "
+                       "free space in this calculation. (G1 collector only)");
+   FLAG_RANGE(         InitiatingHeapOccupancyPercent, 0, 100);
+
+NOTPROD_FLAG(bool,     ScavengeALot, false, JVMFlag::DEFAULT,
+                       "Force scavenge at every Nth exit from the runtime system "
+                       "(N=ScavengeALotInterval)");
+
+DEVELOP_FLAG(bool,     FullGCALot, false, JVMFlag::DEFAULT,
+                       "Force full gc at every Nth exit from the runtime system "
+                       "(N=FullGCALotInterval)");
+
+NOTPROD_FLAG(bool,     GCALotAtAllSafepoints, false, JVMFlag::DEFAULT,
+                       "Enforce ScavengeALot/GCALot at all potential safepoints");
+
+NOTPROD_FLAG(bool,     PromotionFailureALot, false, JVMFlag::DEFAULT,
+                       "Use promotion failure handling on every youngest generation "
+                       "collection");
+
+DEVELOP_FLAG(uintx,    PromotionFailureALotCount, 1000, JVMFlag::DEFAULT,
+                       "Number of promotion failures occurring at PLAB promotion "
+                       "attempts at young collectors");
+
+DEVELOP_FLAG(uintx,    PromotionFailureALotInterval, 5, JVMFlag::DEFAULT,
+                       "Total collections between promotion failures a lot");
+
+PRODUCT_FLAG(uintx,    WorkStealingSleepMillis, 1, JVMFlag::EXPERIMENTAL,
+                       "Sleep time when sleep is used for yields");
+
+PRODUCT_FLAG(uintx,    WorkStealingYieldsBeforeSleep, 5000, JVMFlag::EXPERIMENTAL,
+                       "Number of yields before a sleep is done during work stealing");
+
+PRODUCT_FLAG(uintx,    WorkStealingHardSpins, 4096, JVMFlag::EXPERIMENTAL,
+                       "Number of iterations in a spin loop between checks on "
+                       "time out of hard spin");
+
+PRODUCT_FLAG(uintx,    WorkStealingSpinToYieldRatio, 10, JVMFlag::EXPERIMENTAL,
+                       "Ratio of hard spins to calls to yield");
+
+DEVELOP_FLAG(uintx,    ObjArrayMarkingStride, 2048, JVMFlag::DEFAULT,
+                       "Number of object array elements to push onto the marking stack "
+                       "before pushing a continuation entry");
+
+DEVELOP_FLAG(bool,     MetadataAllocationFailALot, false, JVMFlag::DEFAULT,
+                       "Fail metadata allocations at intervals controlled by "
+                       "MetadataAllocationFailALotInterval");
+
+DEVELOP_FLAG(uintx,    MetadataAllocationFailALotInterval, 1000, JVMFlag::DEFAULT,
+                       "Metadata allocation failure a lot interval");
+
+PRODUCT_FLAG(bool,     ExecutingUnitTests, false, JVMFlag::DEFAULT,
+                       "Whether the JVM is running unit tests or not");
+
+PRODUCT_FLAG_PD(bool,  UseTLAB, JVMFlag::DEFAULT,
+                       "Use thread-local object allocation");
+
+PRODUCT_FLAG_PD(bool,  ResizeTLAB, JVMFlag::DEFAULT,
+                       "Dynamically resize TLAB size for threads");
+
+PRODUCT_FLAG(bool,     ZeroTLAB, false, JVMFlag::DEFAULT,
+                       "Zero out the newly created TLAB");
+
+PRODUCT_FLAG(bool,     TLABStats, true, JVMFlag::DEFAULT,
+                       "Provide more detailed and expensive TLAB statistics.");
+
+PRODUCT_FLAG_PD(bool,  NeverActAsServerClassMachine, JVMFlag::DEFAULT,
+                       "Never act like a server-class machine");
+
+PRODUCT_FLAG(bool,     AlwaysActAsServerClassMachine, false, JVMFlag::DEFAULT,
+                       "Always act like a server-class machine");
+
+PRODUCT_FLAG_PD(uint64_t,    MaxRAM, JVMFlag::RANGE,
+                       "Real memory size (in bytes) used to set maximum heap size");
+   FLAG_RANGE(         MaxRAM, 0, 0XFFFFFFFFFFFFFFFF);
+
+PRODUCT_FLAG(bool,     AggressiveHeap, false, JVMFlag::DEFAULT,
+                       "Optimize heap options for long-running memory intensive apps");
+
+PRODUCT_FLAG(size_t,   ErgoHeapSizeLimit, 0, JVMFlag::RANGE,
+                       "Maximum ergonomically set heap size (in bytes); zero means use "
+                       "MaxRAM * MaxRAMPercentage / 100");
+   FLAG_RANGE(         ErgoHeapSizeLimit, 0, max_uintx);
+
+PRODUCT_FLAG(uintx,    MaxRAMFraction, 4, JVMFlag::RANGE,
+                       "Maximum fraction (1/n) of real memory used for maximum heap "
+                       "size. "
+                       "Deprecated, use MaxRAMPercentage instead");
+   FLAG_RANGE(         MaxRAMFraction, 1, max_uintx);
+
+PRODUCT_FLAG(uintx,    MinRAMFraction, 2, JVMFlag::RANGE,
+                       "Minimum fraction (1/n) of real memory used for maximum heap "
+                       "size on systems with small physical memory size. "
+                       "Deprecated, use MinRAMPercentage instead");
+   FLAG_RANGE(         MinRAMFraction, 1, max_uintx);
+
+PRODUCT_FLAG(uintx,    InitialRAMFraction, 64, JVMFlag::RANGE,
+                       "Fraction (1/n) of real memory used for initial heap size. "
+                       "Deprecated, use InitialRAMPercentage instead");
+   FLAG_RANGE(         InitialRAMFraction, 1, max_uintx);
+
+PRODUCT_FLAG(double,   MaxRAMPercentage, 25.0, JVMFlag::RANGE,
+                       "Maximum percentage of real memory used for maximum heap size");
+   FLAG_RANGE(         MaxRAMPercentage, 0.0, 100.0);
+
+PRODUCT_FLAG(double,   MinRAMPercentage, 50.0, JVMFlag::RANGE,
+                       "Minimum percentage of real memory used for maximum heap"
+                       "size on systems with small physical memory size");
+   FLAG_RANGE(         MinRAMPercentage, 0.0, 100.0);
+
+PRODUCT_FLAG(double,   InitialRAMPercentage, 1.5625, JVMFlag::RANGE,
+                       "Percentage of real memory used for initial heap size");
+   FLAG_RANGE(         InitialRAMPercentage, 0.0, 100.0);
+
+PRODUCT_FLAG(int,      ActiveProcessorCount, -1, JVMFlag::DEFAULT,
+                       "Specify the CPU count the VM should use and report as active");
+
+DEVELOP_FLAG(uintx,    MaxVirtMemFraction, 2, JVMFlag::DEFAULT,
+                       "Maximum fraction (1/n) of virtual memory used for ergonomically "
+                       "determining maximum heap size");
+
+PRODUCT_FLAG(bool,     UseAdaptiveSizePolicy, true, JVMFlag::DEFAULT,
+                       "Use adaptive generation sizing policies");
+
+PRODUCT_FLAG(bool,     UsePSAdaptiveSurvivorSizePolicy, true, JVMFlag::DEFAULT,
+                       "Use adaptive survivor sizing policies");
+
+PRODUCT_FLAG(bool,     UseAdaptiveGenerationSizePolicyAtMinorCollection, true, JVMFlag::DEFAULT,
+                       "Use adaptive young-old sizing policies at minor collections");
+
+PRODUCT_FLAG(bool,     UseAdaptiveGenerationSizePolicyAtMajorCollection, true, JVMFlag::DEFAULT,
+                       "Use adaptive young-old sizing policies at major collections");
+
+PRODUCT_FLAG(bool,     UseAdaptiveSizePolicyWithSystemGC, false, JVMFlag::DEFAULT,
+                       "Include statistics from System.gc() for adaptive size policy");
+
+PRODUCT_FLAG(bool,     UseAdaptiveGCBoundary, false, JVMFlag::DEFAULT,
+                       "Allow young-old boundary to move");
+
+DEVELOP_FLAG(intx,     PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, JVMFlag::RANGE,
+                       "Resize the virtual spaces of the young or old generations");
+   FLAG_RANGE(         PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, 1);
+
+PRODUCT_FLAG(uintx,    AdaptiveSizeThroughPutPolicy, 0, JVMFlag::RANGE,
+                       "Policy for changing generation size for throughput goals");
+   FLAG_RANGE(         AdaptiveSizeThroughPutPolicy, 0, 1);
+
+PRODUCT_FLAG(uintx,    AdaptiveSizePolicyInitializingSteps, 20, JVMFlag::RANGE,
+                       "Number of steps where heuristics is used before data is used");
+   FLAG_RANGE(         AdaptiveSizePolicyInitializingSteps, 0, max_uintx);
+
+DEVELOP_FLAG(uintx,    AdaptiveSizePolicyReadyThreshold, 5, JVMFlag::DEFAULT,
+                       "Number of collections before the adaptive sizing is started");
+
+PRODUCT_FLAG(uintx,    AdaptiveSizePolicyOutputInterval, 0, JVMFlag::RANGE,
+                       "Collection interval for printing information; zero means never");
+   FLAG_RANGE(         AdaptiveSizePolicyOutputInterval, 0, max_uintx);
+
+PRODUCT_FLAG(bool,     UseAdaptiveSizePolicyFootprintGoal, true, JVMFlag::DEFAULT,
+                       "Use adaptive minimum footprint as a goal");
+
+PRODUCT_FLAG(uintx,    AdaptiveSizePolicyWeight, 10, JVMFlag::RANGE,
+                       "Weight given to exponential resizing, between 0 and 100");
+   FLAG_RANGE(         AdaptiveSizePolicyWeight, 0, 100);
+
+PRODUCT_FLAG(uintx,    AdaptiveTimeWeight, 25, JVMFlag::RANGE,
+                       "Weight given to time in adaptive policy, between 0 and 100");
+   FLAG_RANGE(         AdaptiveTimeWeight, 0, 100);
+
+PRODUCT_FLAG(uintx,    PausePadding, 1, JVMFlag::RANGE,
+                       "How much buffer to keep for pause time");
+   FLAG_RANGE(         PausePadding, 0, max_juint);
+
+PRODUCT_FLAG(uintx,    PromotedPadding, 3, JVMFlag::RANGE,
+                       "How much buffer to keep for promotion failure");
+   FLAG_RANGE(         PromotedPadding, 0, max_juint);
+
+PRODUCT_FLAG(uintx,    SurvivorPadding, 3, JVMFlag::RANGE,
+                       "How much buffer to keep for survivor overflow");
+   FLAG_RANGE(         SurvivorPadding, 0, max_juint);
+
+PRODUCT_FLAG(uintx,    ThresholdTolerance, 10, JVMFlag::RANGE,
+                       "Allowed collection cost difference between generations");
+   FLAG_RANGE(         ThresholdTolerance, 0, 100);
+
+PRODUCT_FLAG(uintx,    AdaptiveSizePolicyCollectionCostMargin, 50, JVMFlag::RANGE,
+                       "If collection costs are within margin, reduce both by full "
+                       "delta");
+   FLAG_RANGE(         AdaptiveSizePolicyCollectionCostMargin, 0, 100);
+
+PRODUCT_FLAG(uintx,    YoungGenerationSizeIncrement, 20, JVMFlag::RANGE,
+                       "Adaptive size percentage change in young generation");
+   FLAG_RANGE(         YoungGenerationSizeIncrement, 0, 100);
+
+PRODUCT_FLAG(uintx,    YoungGenerationSizeSupplement, 80, JVMFlag::RANGE,
+                       "Supplement to YoungedGenerationSizeIncrement used at startup");
+   FLAG_RANGE(         YoungGenerationSizeSupplement, 0, 100);
+
+PRODUCT_FLAG(uintx,    YoungGenerationSizeSupplementDecay, 8, JVMFlag::RANGE,
+                       "Decay factor to YoungedGenerationSizeSupplement");
+   FLAG_RANGE(         YoungGenerationSizeSupplementDecay, 1, max_uintx);
+
+PRODUCT_FLAG(uintx,    TenuredGenerationSizeIncrement, 20, JVMFlag::RANGE,
+                       "Adaptive size percentage change in tenured generation");
+   FLAG_RANGE(         TenuredGenerationSizeIncrement, 0, 100);
+
+PRODUCT_FLAG(uintx,    TenuredGenerationSizeSupplement, 80, JVMFlag::RANGE,
+                       "Supplement to TenuredGenerationSizeIncrement used at startup");
+   FLAG_RANGE(         TenuredGenerationSizeSupplement, 0, 100);
+
+PRODUCT_FLAG(uintx,    TenuredGenerationSizeSupplementDecay, 2, JVMFlag::RANGE,
+                       "Decay factor to TenuredGenerationSizeIncrement");
+   FLAG_RANGE(         TenuredGenerationSizeSupplementDecay, 1, max_uintx);
+
+PRODUCT_FLAG(uintx,    MaxGCPauseMillis, max_uintx - 1, JVMFlag::RANGE | JVMFlag::CONSTRAINT,
+                       "Adaptive size policy maximum GC pause time goal in millisecond, "
+                       "or (G1 Only) the maximum GC time per MMU time slice");
+   FLAG_RANGE(         MaxGCPauseMillis, 1, max_uintx - 1);
+   FLAG_CONSTRAINT(    MaxGCPauseMillis, (void*)MaxGCPauseMillisConstraintFunc, JVMFlag::AfterErgo);
+
+PRODUCT_FLAG(uintx,    GCPauseIntervalMillis, 0, JVMFlag::CONSTRAINT,
+                       "Time slice for MMU specification");
+   FLAG_CONSTRAINT(    GCPauseIntervalMillis, (void*)GCPauseIntervalMillisConstraintFunc, JVMFlag::AfterErgo);
+
+PRODUCT_FLAG(uintx,    MaxGCMinorPauseMillis, max_uintx, JVMFlag::RANGE,
+                       "Adaptive size policy maximum GC minor pause time goal "
+                       "in millisecond");
+   FLAG_RANGE(         MaxGCMinorPauseMillis, 0, max_uintx);
+
+PRODUCT_FLAG(uintx,    GCTimeRatio, 99, JVMFlag::RANGE,
+                       "Adaptive size policy application time to GC time ratio");
+   FLAG_RANGE(         GCTimeRatio, 0, max_juint);
+
+PRODUCT_FLAG(uintx,    AdaptiveSizeDecrementScaleFactor, 4, JVMFlag::RANGE,
+                       "Adaptive size scale down factor for shrinking");
+   FLAG_RANGE(         AdaptiveSizeDecrementScaleFactor, 1, max_uintx);
+
+PRODUCT_FLAG(bool,     UseAdaptiveSizeDecayMajorGCCost, true, JVMFlag::DEFAULT,
+                       "Adaptive size decays the major cost for long major intervals");
+
+PRODUCT_FLAG(uintx,    AdaptiveSizeMajorGCDecayTimeScale, 10, JVMFlag::RANGE,
+                       "Time scale over which major costs decay");
+   FLAG_RANGE(         AdaptiveSizeMajorGCDecayTimeScale, 0, max_uintx);
+
+PRODUCT_FLAG(uintx,    MinSurvivorRatio, 3, JVMFlag::RANGE,
+                       "Minimum ratio of young generation/survivor space size");
+   FLAG_RANGE(         MinSurvivorRatio, 3, max_uintx);
+
+PRODUCT_FLAG(uintx,    InitialSurvivorRatio, 8, JVMFlag::RANGE,
+                       "Initial ratio of young generation/survivor space size");
+   FLAG_RANGE(         InitialSurvivorRatio, 0, max_uintx);
+
+PRODUCT_FLAG(size_t,   BaseFootPrintEstimate, 256*M, JVMFlag::RANGE,
+                       "Estimate of footprint other than Java Heap");
+   FLAG_RANGE(         BaseFootPrintEstimate, 0, max_uintx);
+
+PRODUCT_FLAG(bool,     UseGCOverheadLimit, true, JVMFlag::DEFAULT,
+                       "Use policy to limit of proportion of time spent in GC "
+                       "before an OutOfMemory error is thrown");
+
+PRODUCT_FLAG(uintx,    GCTimeLimit, 98, JVMFlag::RANGE,
+                       "Limit of the proportion of time spent in GC before "
+                       "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)");
+   FLAG_RANGE(         GCTimeLimit, 0, 100);
+
+PRODUCT_FLAG(uintx,    GCHeapFreeLimit, 2, JVMFlag::RANGE,
+                       "Minimum percentage of free space after a full GC before an "
+                       "OutOfMemoryError is thrown (used with GCTimeLimit)");
+   FLAG_RANGE(         GCHeapFreeLimit, 0, 100);
+
+DEVELOP_FLAG(uintx,    GCOverheadLimitThreshold, 5, JVMFlag::RANGE,
+                       "Number of consecutive collections before gc time limit fires");
+   FLAG_RANGE(         GCOverheadLimitThreshold, 1, max_uintx);
+
+PRODUCT_FLAG(intx,     PrefetchCopyIntervalInBytes, -1, JVMFlag::RANGE,
+                       "How far ahead to prefetch destination area (<= 0 means off)");
+   FLAG_RANGE(         PrefetchCopyIntervalInBytes, -1, max_jint);
+
+PRODUCT_FLAG(intx,     PrefetchScanIntervalInBytes, -1, JVMFlag::RANGE,
+                       "How far ahead to prefetch scan area (<= 0 means off)");
+   FLAG_RANGE(         PrefetchScanIntervalInBytes, -1, max_jint);
+
+PRODUCT_FLAG(intx,     PrefetchFieldsAhead, -1, JVMFlag::RANGE,
+                       "How many fields ahead to prefetch in oop scan (<= 0 means off)");
+   FLAG_RANGE(         PrefetchFieldsAhead, -1, max_jint);
+
+PRODUCT_FLAG(bool,     VerifyDuringStartup, false, JVMFlag::DIAGNOSTIC,
+                       "Verify memory system before executing any Java code "
+                       "during VM initialization");
+
+PRODUCT_FLAG(bool,     VerifyBeforeExit, trueInDebug, JVMFlag::DIAGNOSTIC,
+                       "Verify system before exiting");
+
+PRODUCT_FLAG(bool,     VerifyBeforeGC, false, JVMFlag::DIAGNOSTIC,
+                       "Verify memory system before GC");
+
+PRODUCT_FLAG(bool,     VerifyAfterGC, false, JVMFlag::DIAGNOSTIC,
+                       "Verify memory system after GC");
+
+PRODUCT_FLAG(bool,     VerifyDuringGC, false, JVMFlag::DIAGNOSTIC,
+                       "Verify memory system during GC (between phases)");
+
+PRODUCT_FLAG(ccstr,    VerifyGCType, "", JVMFlag::DIAGNOSTIC | JVMFlag::STRINGLIST,
+                       "GC type(s) to verify when Verify*GC is enabled."
+                       "Available types are collector specific.");
+
+PRODUCT_FLAG(ccstr,    VerifySubSet, "", JVMFlag::DIAGNOSTIC | JVMFlag::STRINGLIST,
+                       "Memory sub-systems to verify when Verify*GC flag(s) "
+                       "are enabled. One or more sub-systems can be specified "
+                       "in a comma separated string. Sub-systems are: "
+                       "threads, heap, symbol_table, string_table, codecache, "
+                       "dictionary, classloader_data_graph, metaspace, jni_handles, "
+                       "codecache_oops");
+
+PRODUCT_FLAG(bool,     GCParallelVerificationEnabled, true, JVMFlag::DIAGNOSTIC,
+                       "Enable parallel memory system verification");
+
+PRODUCT_FLAG(bool,     DeferInitialCardMark, false, JVMFlag::DIAGNOSTIC,
+                       "When +ReduceInitialCardMarks, explicitly defer any that "
+                       "may arise from new_pre_store_barrier");
+
+PRODUCT_FLAG(bool,     UseCondCardMark, false, JVMFlag::DEFAULT,
+                       "Check for already marked card before updating card table");
+
+PRODUCT_FLAG(bool,     VerifyRememberedSets, false, JVMFlag::DIAGNOSTIC,
+                       "Verify GC remembered sets");
+
+PRODUCT_FLAG(bool,     VerifyObjectStartArray, true, JVMFlag::DIAGNOSTIC,
+                       "Verify GC object start array if verify before/after");
+
+PRODUCT_FLAG(bool,     DisableExplicitGC, false, JVMFlag::DEFAULT,
+                       "Ignore calls to System.gc()");
+
+PRODUCT_FLAG(bool,     PrintGC, false, JVMFlag::DEFAULT,
+                       "Print message at garbage collection. "
+                       "Deprecated, use -Xlog:gc instead.");
+
+PRODUCT_FLAG(bool,     PrintGCDetails, false, JVMFlag::DEFAULT,
+                       "Print more details at garbage collection. "
+                       "Deprecated, use -Xlog:gc* instead.");
+
+DEVELOP_FLAG(intx,     ConcGCYieldTimeout, 0, JVMFlag::RANGE,
+                       "If non-zero, assert that GC threads yield within this "
+                       "number of milliseconds");
+   FLAG_RANGE(         ConcGCYieldTimeout, 0, max_intx);
+
+NOTPROD_FLAG(intx,     ScavengeALotInterval, 1, JVMFlag::DEFAULT,
+                       "Interval between which scavenge will occur with +ScavengeALot");
+
+NOTPROD_FLAG(intx,     FullGCALotInterval, 1, JVMFlag::DEFAULT,
+                       "Interval between which full gc will occur with +FullGCALot");
+
+NOTPROD_FLAG(intx,     FullGCALotStart, 0, JVMFlag::DEFAULT,
+                       "For which invocation to start FullGCAlot");
+
+NOTPROD_FLAG(intx,     FullGCALotDummies, 32*K, JVMFlag::DEFAULT,
+                       "Dummy object allocated with +FullGCALot, forcing all objects "
+                       "to move");
+
+
+    //  gc parameters 
+PRODUCT_FLAG(size_t,   MinHeapSize, 0, JVMFlag::CONSTRAINT,
+                       "Minimum heap size (in bytes); zero means use ergonomics");
+   FLAG_CONSTRAINT(    MinHeapSize, (void*)MinHeapSizeConstraintFunc, JVMFlag::AfterErgo);
+
+PRODUCT_FLAG(size_t,   InitialHeapSize, 0, JVMFlag::CONSTRAINT,
+                       "Initial heap size (in bytes); zero means use ergonomics");
+   FLAG_CONSTRAINT(    InitialHeapSize, (void*)InitialHeapSizeConstraintFunc, JVMFlag::AfterErgo);
+
+PRODUCT_FLAG(size_t,   MaxHeapSize, ScaleForWordSize(96*M), JVMFlag::CONSTRAINT,
+                       "Maximum heap size (in bytes)");
+   FLAG_CONSTRAINT(    MaxHeapSize, (void*)MaxHeapSizeConstraintFunc, JVMFlag::AfterErgo);
+
+PRODUCT_FLAG(size_t,   SoftMaxHeapSize, 0, JVMFlag::MANAGEABLE | JVMFlag::CONSTRAINT,
+                       "Soft limit for maximum heap size (in bytes)");
+   FLAG_CONSTRAINT(    SoftMaxHeapSize, (void*)SoftMaxHeapSizeConstraintFunc, JVMFlag::AfterMemoryInit);
+
+PRODUCT_FLAG(size_t,   OldSize, ScaleForWordSize(4*M), JVMFlag::RANGE,
+                       "Initial tenured generation size (in bytes)");
+   FLAG_RANGE(         OldSize, 0, max_uintx);
+
+PRODUCT_FLAG(size_t,   NewSize, ScaleForWordSize(1*M), JVMFlag::CONSTRAINT,
+                       "Initial new generation size (in bytes)");
+   FLAG_CONSTRAINT(    NewSize, (void*)NewSizeConstraintFunc, JVMFlag::AfterErgo);
+
+PRODUCT_FLAG(size_t,   MaxNewSize, max_uintx, JVMFlag::RANGE,
+                       "Maximum new generation size (in bytes), max_uintx means set "
+                       "ergonomically");
+   FLAG_RANGE(         MaxNewSize, 0, max_uintx);
+
+PRODUCT_FLAG_PD(size_t,  HeapBaseMinAddress, JVMFlag::CONSTRAINT,
+                       "OS specific low limit for heap base address");
+   FLAG_CONSTRAINT(    HeapBaseMinAddress, (void*)HeapBaseMinAddressConstraintFunc, JVMFlag::AfterErgo);
+
+PRODUCT_FLAG(size_t,   PretenureSizeThreshold, 0, JVMFlag::RANGE,
+                       "Maximum size in bytes of objects allocated in DefNew "
+                       "generation; zero means no maximum");
+   FLAG_RANGE(         PretenureSizeThreshold, 0, max_uintx);
+
+PRODUCT_FLAG(size_t,   MinTLABSize, 2*K, JVMFlag::RANGE | JVMFlag::CONSTRAINT,
+                       "Minimum allowed TLAB size (in bytes)");
+   FLAG_RANGE(         MinTLABSize, 1, max_uintx/2);
+   FLAG_CONSTRAINT(    MinTLABSize, (void*)MinTLABSizeConstraintFunc, JVMFlag::AfterMemoryInit);
+
+PRODUCT_FLAG(size_t,   TLABSize, 0, JVMFlag::CONSTRAINT,
+                       "Starting TLAB size (in bytes); zero means set ergonomically");
+   FLAG_CONSTRAINT(    TLABSize, (void*)TLABSizeConstraintFunc, JVMFlag::AfterMemoryInit);
+
+PRODUCT_FLAG(size_t,   YoungPLABSize, 4096, JVMFlag::CONSTRAINT,
+                       "Size of young gen promotion LAB's (in HeapWords)");
+   FLAG_CONSTRAINT(    YoungPLABSize, (void*)YoungPLABSizeConstraintFunc, JVMFlag::AfterMemoryInit);
+
+PRODUCT_FLAG(size_t,   OldPLABSize, 1024, JVMFlag::CONSTRAINT,
+                       "Size of old gen promotion LAB's (in HeapWords)");
+   FLAG_CONSTRAINT(    OldPLABSize, (void*)OldPLABSizeConstraintFunc, JVMFlag::AfterMemoryInit);
+
+PRODUCT_FLAG(uintx,    TLABAllocationWeight, 35, JVMFlag::RANGE,
+                       "Allocation averaging weight");
+   FLAG_RANGE(         TLABAllocationWeight, 0, 100);
+
+
+    //  Limit the lower bound of this flag to 1 as it is used  
+    //  in a division expression.                              
+PRODUCT_FLAG(uintx,    TLABWasteTargetPercent, 1, JVMFlag::RANGE,
+                       "Percentage of Eden that can be wasted");
+   FLAG_RANGE(         TLABWasteTargetPercent, 1, 100);
+
+PRODUCT_FLAG(uintx,    TLABRefillWasteFraction, 64, JVMFlag::RANGE,
+                       "Maximum TLAB waste at a refill (internal fragmentation)");
+   FLAG_RANGE(         TLABRefillWasteFraction, 1, max_juint);
+
+PRODUCT_FLAG(uintx,    TLABWasteIncrement, 4, JVMFlag::RANGE | JVMFlag::CONSTRAINT,
+                       "Increment allowed waste at slow allocation");
+   FLAG_RANGE(         TLABWasteIncrement, 0, max_jint);
+   FLAG_CONSTRAINT(    TLABWasteIncrement, (void*)TLABWasteIncrementConstraintFunc, JVMFlag::AfterMemoryInit);
+
+PRODUCT_FLAG(uintx,    SurvivorRatio, 8, JVMFlag::RANGE | JVMFlag::CONSTRAINT,
+                       "Ratio of eden/survivor space size");
+   FLAG_RANGE(         SurvivorRatio, 1, max_uintx-2);
+   FLAG_CONSTRAINT(    SurvivorRatio, (void*)SurvivorRatioConstraintFunc, JVMFlag::AfterMemoryInit);
+
+PRODUCT_FLAG(uintx,    NewRatio, 2, JVMFlag::RANGE,
+                       "Ratio of old/new generation sizes");
+   FLAG_RANGE(         NewRatio, 0, max_uintx-1);
+
+PRODUCT_FLAG_PD(size_t,  NewSizeThreadIncrease, JVMFlag::RANGE,
+                       "Additional size added to desired new generation size per "
+                       "non-daemon thread (in bytes)");
+   FLAG_RANGE(         NewSizeThreadIncrease, 0, max_uintx);
+
+PRODUCT_FLAG(uintx,    QueuedAllocationWarningCount, 0, JVMFlag::RANGE,
+                       "Number of times an allocation that queues behind a GC "
+                       "will retry before printing a warning");
+   FLAG_RANGE(         QueuedAllocationWarningCount, 0, max_uintx);
+
+PRODUCT_FLAG(uintx,    VerifyGCStartAt, 0, JVMFlag::DIAGNOSTIC | JVMFlag::RANGE,
+                       "GC invoke count where +VerifyBefore/AfterGC kicks in");
+   FLAG_RANGE(         VerifyGCStartAt, 0, max_uintx);
+
+PRODUCT_FLAG(intx,     VerifyGCLevel, 0, JVMFlag::DIAGNOSTIC | JVMFlag::RANGE,
+                       "Generation level at which to start +VerifyBefore/AfterGC");
+   FLAG_RANGE(         VerifyGCLevel, 0, 1);
+
+PRODUCT_FLAG(uintx,    MaxTenuringThreshold, 15, JVMFlag::RANGE | JVMFlag::CONSTRAINT,
+                       "Maximum value for tenuring threshold");
+ //TODO: to avoid circular dependency, the min/max cannot be declared in header file
+ //FLAG_RANGE(         MaxTenuringThreshold, 0, markWord::max_age + 1);
+   FLAG_CONSTRAINT(    MaxTenuringThreshold, (void*)MaxTenuringThresholdConstraintFunc, JVMFlag::AfterErgo);
+
+PRODUCT_FLAG(uintx,    InitialTenuringThreshold, 7, JVMFlag::RANGE | JVMFlag::CONSTRAINT,
+                       "Initial value for tenuring threshold");
+ //TODO: to avoid circular dependency, the min/max cannot be declared in header file
+ //FLAG_RANGE(         InitialTenuringThreshold, 0, markWord::max_age + 1);
+   FLAG_CONSTRAINT(    InitialTenuringThreshold, (void*)InitialTenuringThresholdConstraintFunc, JVMFlag::AfterErgo);
+
+PRODUCT_FLAG(uintx,    TargetSurvivorRatio, 50, JVMFlag::RANGE,
+                       "Desired percentage of survivor space used after scavenge");
+   FLAG_RANGE(         TargetSurvivorRatio, 0, 100);
+
+PRODUCT_FLAG(uintx,    MarkSweepDeadRatio, 5, JVMFlag::RANGE,
+                       "Percentage (0-100) of the old gen allowed as dead wood. "
+                       "Serial mark sweep treats this as both the minimum and maximum "
+                       "value. "
+                       "Par compact uses a variable scale based on the density of the "
+                       "generation and treats this as the maximum value when the heap "
+                       "is either completely full or completely empty.  Par compact "
+                       "also has a smaller default value; see arguments.cpp.");
+   FLAG_RANGE(         MarkSweepDeadRatio, 0, 100);
+
+PRODUCT_FLAG(uint,     MarkSweepAlwaysCompactCount, 4, JVMFlag::RANGE,
+                       "How often should we fully compact the heap (ignoring the dead "
+                       "space parameters)");
+   FLAG_RANGE(         MarkSweepAlwaysCompactCount, 1, max_juint);
+
+DEVELOP_FLAG(uintx,    GCExpandToAllocateDelayMillis, 0, JVMFlag::DEFAULT,
+                       "Delay between expansion and allocation (in milliseconds)");
+
+PRODUCT_FLAG(uintx,    GCDrainStackTargetSize, 64, JVMFlag::RANGE,
+                       "Number of entries we will try to leave on the stack "
+                       "during parallel gc");
+   FLAG_RANGE(         GCDrainStackTargetSize, 0, max_juint);
 
 #endif // SHARE_GC_SHARED_GC_GLOBALS_HPP
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