src/share/vm/gc/g1/g1_globals.hpp
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  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_GC_G1_G1_GLOBALS_HPP
  26 #define SHARE_VM_GC_G1_G1_GLOBALS_HPP
  27 
  28 #include "runtime/globals.hpp"
  29 //
  30 // Defines all globals flags used by the garbage-first compiler.
  31 //
  32 
  33 #define G1_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw) \
  34                                                                             \
  35   product(uintx, G1ConfidencePercent, 50,                                   \
  36           "Confidence level for MMU/pause predictions")                     \

  37                                                                             \
  38   develop(intx, G1MarkingOverheadPercent, 0,                                \
  39           "Overhead of concurrent marking")                                 \

  40                                                                             \
  41   develop(intx, G1MarkingVerboseLevel, 0,                                   \
  42           "Level (0-4) of verboseness of the marking code")                 \

  43                                                                             \
  44   develop(bool, G1TraceMarkStackOverflow, false,                            \
  45           "If true, extra debugging code for CM restart for ovflw.")        \
  46                                                                             \
  47   develop(bool, G1TraceHeapRegionRememberedSet, false,                      \
  48           "Enables heap region remembered set debug logs")                  \
  49                                                                             \
  50   diagnostic(bool, G1SummarizeConcMark, false,                              \
  51           "Summarize concurrent mark info")                                 \
  52                                                                             \
  53   diagnostic(bool, G1SummarizeRSetStats, false,                             \
  54           "Summarize remembered set processing info")                       \
  55                                                                             \
  56   diagnostic(intx, G1SummarizeRSetStatsPeriod, 0,                           \
  57           "The period (in number of GCs) at which we will generate "        \
  58           "update buffer processing info "                                  \
  59           "(0 means do not periodically generate this info); "              \
  60           "it also requires -XX:+G1SummarizeRSetStats")                     \
  61                                                                             \
  62   diagnostic(bool, G1TraceConcRefinement, false,                            \
  63           "Trace G1 concurrent refinement")                                 \
  64                                                                             \
  65   experimental(bool, G1TraceStringSymbolTableScrubbing, false,              \
  66           "Trace information string and symbol table scrubbing.")           \
  67                                                                             \
  68   product(double, G1ConcMarkStepDurationMillis, 10.0,                       \
  69           "Target duration of individual concurrent marking steps "         \
  70           "in milliseconds.")                                               \

  71                                                                             \
  72   product(intx, G1RefProcDrainInterval, 10,                                 \
  73           "The number of discovered reference objects to process before "   \
  74           "draining concurrent marking work queues.")                       \

  75                                                                             \
  76   experimental(bool, G1UseConcMarkReferenceProcessing, true,                \
  77           "If true, enable reference discovery during concurrent "          \
  78           "marking and reference processing at the end of remark.")         \
  79                                                                             \
  80   product(size_t, G1SATBBufferSize, 1*K,                                    \
  81           "Number of entries in an SATB log buffer.")                       \
  82                                                                             \
  83   develop(intx, G1SATBProcessCompletedThreshold, 20,                        \
  84           "Number of completed buffers that triggers log processing.")      \
  85                                                                             \
  86   product(uintx, G1SATBBufferEnqueueingThresholdPercent, 60,                \
  87           "Before enqueueing them, each mutator thread tries to do some "   \
  88           "filtering on the SATB buffers it generates. If post-filtering "  \
  89           "the percentage of retained entries is over this threshold "      \
  90           "the buffer will be enqueued for processing. A value of 0 "       \
  91           "specifies that mutator threads should not do such filtering.")   \

  92                                                                             \
  93   experimental(intx, G1ExpandByPercentOfAvailable, 20,                      \
  94           "When expanding, % of uncommitted space to claim.")               \

  95                                                                             \
  96   develop(bool, G1RSBarrierRegionFilter, true,                              \
  97           "If true, generate region filtering code in RS barrier")          \
  98                                                                             \
  99   diagnostic(bool, G1PrintRegionLivenessInfo, false,                        \
 100             "Prints the liveness information for all regions in the heap "  \
 101             "at the end of a marking cycle.")                               \
 102                                                                             \
 103   product(size_t, G1UpdateBufferSize, 256,                                  \
 104           "Size of an update buffer")                                       \
 105                                                                             \
 106   product(intx, G1ConcRefinementYellowZone, 0,                              \
 107           "Number of enqueued update buffers that will "                    \
 108           "trigger concurrent processing. Will be selected ergonomically "  \
 109           "by default.")                                                    \
 110                                                                             \
 111   product(intx, G1ConcRefinementRedZone, 0,                                 \
 112           "Maximum number of enqueued update buffers before mutator "       \
 113           "threads start processing new ones instead of enqueueing them. "  \
 114           "Will be selected ergonomically by default. Zero will disable "   \


 121                                                                             \
 122   product(intx, G1ConcRefinementServiceIntervalMillis, 300,                 \
 123           "The last concurrent refinement thread wakes up every "           \
 124           "specified number of milliseconds to do miscellaneous work.")     \
 125                                                                             \
 126   product(intx, G1ConcRefinementThresholdStep, 0,                           \
 127           "Each time the rset update queue increases by this amount "       \
 128           "activate the next refinement thread if available. "              \
 129           "Will be selected ergonomically by default.")                     \
 130                                                                             \
 131   product(intx, G1RSetUpdatingPauseTimePercent, 10,                         \
 132           "A target percentage of time that is allowed to be spend on "     \
 133           "process RS update buffers during the collection pause.")         \
 134                                                                             \
 135   product(bool, G1UseAdaptiveConcRefinement, true,                          \
 136           "Select green, yellow and red zones adaptively to meet the "      \
 137           "the pause requirements.")                                        \
 138                                                                             \
 139   product(size_t, G1ConcRSLogCacheSize, 10,                                 \
 140           "Log base 2 of the length of conc RS hot-card cache.")            \

 141                                                                             \
 142   product(uintx, G1ConcRSHotCardLimit, 4,                                   \
 143           "The threshold that defines (>=) a hot card.")                    \

 144                                                                             \
 145   develop(intx, G1RSetRegionEntriesBase, 256,                               \
 146           "Max number of regions in a fine-grain table per MB.")            \
 147                                                                             \
 148   product(intx, G1RSetRegionEntries, 0,                                     \
 149           "Max number of regions for which we keep bitmaps."                \
 150           "Will be set ergonomically by default")                           \
 151                                                                             \
 152   develop(intx, G1RSetSparseRegionEntriesBase, 4,                           \
 153           "Max number of entries per region in a sparse table "             \
 154           "per MB.")                                                        \
 155                                                                             \
 156   product(intx, G1RSetSparseRegionEntries, 0,                               \
 157           "Max number of entries per region in a sparse table."             \
 158           "Will be set ergonomically by default.")                          \
 159                                                                             \
 160   develop(bool, G1RecordHRRSOops, false,                                    \
 161           "When true, record recent calls to rem set operations.")          \
 162                                                                             \
 163   develop(bool, G1RecordHRRSEvents, false,                                  \


 166   develop(intx, G1MaxVerifyFailures, -1,                                    \
 167           "The maximum number of verification failures to print.  "         \
 168           "-1 means print all.")                                            \
 169                                                                             \
 170   develop(bool, G1ScrubRemSets, true,                                       \
 171           "When true, do RS scrubbing after cleanup.")                      \
 172                                                                             \
 173   develop(bool, G1RSScrubVerbose, false,                                    \
 174           "When true, do RS scrubbing with verbose output.")                \
 175                                                                             \
 176   develop(bool, G1YoungSurvRateVerbose, false,                              \
 177           "print out the survival rate of young regions according to age.") \
 178                                                                             \
 179   develop(intx, G1YoungSurvRateNumRegionsSummary, 0,                        \
 180           "the number of regions for which we'll print a surv rate "        \
 181           "summary.")                                                       \
 182                                                                             \
 183   product(uintx, G1ReservePercent, 10,                                      \
 184           "It determines the minimum reserve we should have in the heap "   \
 185           "to minimize the probability of promotion failure.")              \

 186                                                                             \
 187   diagnostic(bool, G1PrintHeapRegions, false,                               \
 188           "If set G1 will print information on which regions are being "    \
 189           "allocated and which are reclaimed.")                             \
 190                                                                             \
 191   develop(bool, G1HRRSUseSparseTable, true,                                 \
 192           "When true, use sparse table to save space.")                     \
 193                                                                             \
 194   develop(bool, G1HRRSFlushLogBuffersOnVerify, false,                       \
 195           "Forces flushing of log buffers before verification.")            \
 196                                                                             \
 197   develop(bool, G1FailOnFPError, false,                                     \
 198           "When set, G1 will fail when it encounters an FP 'error', "       \
 199           "so as to allow debugging")                                       \
 200                                                                             \
 201   product(size_t, G1HeapRegionSize, 0,                                      \
 202           "Size of the G1 regions.")                                        \
 203                                                                             \
 204   product(uintx, G1ConcRefinementThreads, 0,                                \
 205           "If non-0 is the number of parallel rem set update threads, "     \


 221                                                                             \
 222   develop(bool, G1StressConcRegionFreeing, false,                           \
 223           "It stresses the concurrent region freeing operation")            \
 224                                                                             \
 225   develop(uintx, G1StressConcRegionFreeingDelayMillis, 0,                   \
 226           "Artificial delay during concurrent region freeing")              \
 227                                                                             \
 228   develop(uintx, G1DummyRegionsPerGC, 0,                                    \
 229           "The number of dummy regions G1 will allocate at the end of "     \
 230           "each evacuation pause in order to artificially fill up the "     \
 231           "heap and stress the marking implementation.")                    \
 232                                                                             \
 233   develop(bool, G1ExitOnExpansionFailure, false,                            \
 234           "Raise a fatal VM exit out of memory failure in the event "       \
 235           " that heap expansion fails due to running out of swap.")         \
 236                                                                             \
 237   develop(uintx, G1ConcMarkForceOverflow, 0,                                \
 238           "The number of times we'll force an overflow during "             \
 239           "concurrent marking")                                             \
 240                                                                             \
 241   experimental(uintx, G1NewSizePercent, 5,                                  \
 242           "Percentage (0-100) of the heap size to use as default "          \
 243           "minimum young gen size.")                                        \
 244                                                                             \
 245   experimental(uintx, G1MaxNewSizePercent, 60,                              \
 246           "Percentage (0-100) of the heap size to use as default "          \
 247           " maximum young gen size.")                                       \







 248                                                                             \
 249   experimental(uintx, G1MixedGCLiveThresholdPercent, 85,                    \
 250           "Threshold for regions to be considered for inclusion in the "    \
 251           "collection set of mixed GCs. "                                   \
 252           "Regions with live bytes exceeding this will not be collected.")  \

 253                                                                             \
 254   product(uintx, G1HeapWastePercent, 5,                                     \
 255           "Amount of space, expressed as a percentage of the heap size, "   \
 256           "that G1 is willing not to collect to avoid expensive GCs.")      \

 257                                                                             \
 258   product(uintx, G1MixedGCCountTarget, 8,                                   \
 259           "The target number of mixed GCs after a marking cycle.")          \
 260                                                                             \
 261   experimental(bool, G1EagerReclaimHumongousObjects, true,                  \
 262           "Try to reclaim dead large objects at every young GC.")           \
 263                                                                             \
 264   experimental(bool, G1EagerReclaimHumongousObjectsWithStaleRefs, true,     \
 265           "Try to reclaim dead large objects that have a few stale "        \
 266           "references at every young GC.")                                  \
 267                                                                             \
 268   experimental(bool, G1TraceEagerReclaimHumongousObjects, false,            \
 269           "Print some information about large object liveness "             \
 270           "at every young GC.")                                             \
 271                                                                             \
 272   experimental(uintx, G1OldCSetRegionThresholdPercent, 10,                  \
 273           "An upper bound for the number of old CSet regions expressed "    \
 274           "as a percentage of the heap size.")                              \

 275                                                                             \
 276   experimental(ccstr, G1LogLevel, NULL,                                     \
 277           "Log level for G1 logging: fine, finer, finest")                  \
 278                                                                             \
 279   notproduct(bool, G1EvacuationFailureALot, false,                          \
 280           "Force use of evacuation failure handling during certain "        \
 281           "evacuation pauses")                                              \
 282                                                                             \
 283   develop(uintx, G1EvacuationFailureALotCount, 1000,                        \
 284           "Number of successful evacuations between evacuation failures "   \
 285           "occurring at object copying")                                    \
 286                                                                             \
 287   develop(uintx, G1EvacuationFailureALotInterval, 5,                        \
 288           "Total collections between forced triggering of evacuation "      \
 289           "failures")                                                       \
 290                                                                             \
 291   develop(bool, G1EvacuationFailureALotDuringConcMark, true,                \
 292           "Force use of evacuation failure handling during evacuation "     \
 293           "pauses when marking is in progress")                             \
 294                                                                             \


 297           "evacuation pauses")                                              \
 298                                                                             \
 299   develop(bool, G1EvacuationFailureALotDuringYoungGC, true,                 \
 300           "Force use of evacuation failure handling during young "          \
 301           "evacuation pauses")                                              \
 302                                                                             \
 303   develop(bool, G1EvacuationFailureALotDuringMixedGC, true,                 \
 304           "Force use of evacuation failure handling during mixed "          \
 305           "evacuation pauses")                                              \
 306                                                                             \
 307   diagnostic(bool, G1VerifyRSetsDuringFullGC, false,                        \
 308           "If true, perform verification of each heap region's "            \
 309           "remembered set when verifying the heap during a full GC.")       \
 310                                                                             \
 311   diagnostic(bool, G1VerifyHeapRegionCodeRoots, false,                      \
 312           "Verify the code root lists attached to each heap region.")       \
 313                                                                             \
 314   develop(bool, G1VerifyBitmaps, false,                                     \
 315           "Verifies the consistency of the marking bitmaps")
 316 
 317 G1_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG, DECLARE_MANAGEABLE_FLAG, DECLARE_PRODUCT_RW_FLAG)










 318 
 319 #endif // SHARE_VM_GC_G1_G1_GLOBALS_HPP


  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_GC_G1_G1_GLOBALS_HPP
  26 #define SHARE_VM_GC_G1_G1_GLOBALS_HPP
  27 
  28 #include "runtime/globals.hpp"
  29 //
  30 // Defines all globals flags used by the garbage-first compiler.
  31 //
  32 
  33 #define G1_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, range, constraint) \
  34                                                                             \
  35   product(uintx, G1ConfidencePercent, 50,                                   \
  36           "Confidence level for MMU/pause predictions")                     \
  37           range(0, 100)                                                     \
  38                                                                             \
  39   develop(intx, G1MarkingOverheadPercent, 0,                                \
  40           "Overhead of concurrent marking")                                 \
  41           range(0, 100)                                                     \
  42                                                                             \
  43   develop(intx, G1MarkingVerboseLevel, 0,                                   \
  44           "Level (0-4) of verboseness of the marking code")                 \
  45           range(0, 4)                                                       \
  46                                                                             \
  47   develop(bool, G1TraceMarkStackOverflow, false,                            \
  48           "If true, extra debugging code for CM restart for ovflw.")        \
  49                                                                             \
  50   develop(bool, G1TraceHeapRegionRememberedSet, false,                      \
  51           "Enables heap region remembered set debug logs")                  \
  52                                                                             \
  53   diagnostic(bool, G1SummarizeConcMark, false,                              \
  54           "Summarize concurrent mark info")                                 \
  55                                                                             \
  56   diagnostic(bool, G1SummarizeRSetStats, false,                             \
  57           "Summarize remembered set processing info")                       \
  58                                                                             \
  59   diagnostic(intx, G1SummarizeRSetStatsPeriod, 0,                           \
  60           "The period (in number of GCs) at which we will generate "        \
  61           "update buffer processing info "                                  \
  62           "(0 means do not periodically generate this info); "              \
  63           "it also requires -XX:+G1SummarizeRSetStats")                     \
  64                                                                             \
  65   diagnostic(bool, G1TraceConcRefinement, false,                            \
  66           "Trace G1 concurrent refinement")                                 \
  67                                                                             \
  68   experimental(bool, G1TraceStringSymbolTableScrubbing, false,              \
  69           "Trace information string and symbol table scrubbing.")           \
  70                                                                             \
  71   product(double, G1ConcMarkStepDurationMillis, 10.0,                       \
  72           "Target duration of individual concurrent marking steps "         \
  73           "in milliseconds.")                                               \
  74           range(1.0, (double)max_uintx)                                     \
  75                                                                             \
  76   product(intx, G1RefProcDrainInterval, 10,                                 \
  77           "The number of discovered reference objects to process before "   \
  78           "draining concurrent marking work queues.")                       \
  79           range(1, max_intx)                                                \
  80                                                                             \
  81   experimental(bool, G1UseConcMarkReferenceProcessing, true,                \
  82           "If true, enable reference discovery during concurrent "          \
  83           "marking and reference processing at the end of remark.")         \
  84                                                                             \
  85   product(size_t, G1SATBBufferSize, 1*K,                                    \
  86           "Number of entries in an SATB log buffer.")                       \
  87                                                                             \
  88   develop(intx, G1SATBProcessCompletedThreshold, 20,                        \
  89           "Number of completed buffers that triggers log processing.")      \
  90                                                                             \
  91   product(uintx, G1SATBBufferEnqueueingThresholdPercent, 60,                \
  92           "Before enqueueing them, each mutator thread tries to do some "   \
  93           "filtering on the SATB buffers it generates. If post-filtering "  \
  94           "the percentage of retained entries is over this threshold "      \
  95           "the buffer will be enqueued for processing. A value of 0 "       \
  96           "specifies that mutator threads should not do such filtering.")   \
  97           range(0, 100)                                                     \
  98                                                                             \
  99   experimental(intx, G1ExpandByPercentOfAvailable, 20,                      \
 100           "When expanding, % of uncommitted space to claim.")               \
 101           range(0, 100)                                                     \
 102                                                                             \
 103   develop(bool, G1RSBarrierRegionFilter, true,                              \
 104           "If true, generate region filtering code in RS barrier")          \
 105                                                                             \
 106   diagnostic(bool, G1PrintRegionLivenessInfo, false,                        \
 107             "Prints the liveness information for all regions in the heap "  \
 108             "at the end of a marking cycle.")                               \
 109                                                                             \
 110   product(size_t, G1UpdateBufferSize, 256,                                  \
 111           "Size of an update buffer")                                       \
 112                                                                             \
 113   product(intx, G1ConcRefinementYellowZone, 0,                              \
 114           "Number of enqueued update buffers that will "                    \
 115           "trigger concurrent processing. Will be selected ergonomically "  \
 116           "by default.")                                                    \
 117                                                                             \
 118   product(intx, G1ConcRefinementRedZone, 0,                                 \
 119           "Maximum number of enqueued update buffers before mutator "       \
 120           "threads start processing new ones instead of enqueueing them. "  \
 121           "Will be selected ergonomically by default. Zero will disable "   \


 128                                                                             \
 129   product(intx, G1ConcRefinementServiceIntervalMillis, 300,                 \
 130           "The last concurrent refinement thread wakes up every "           \
 131           "specified number of milliseconds to do miscellaneous work.")     \
 132                                                                             \
 133   product(intx, G1ConcRefinementThresholdStep, 0,                           \
 134           "Each time the rset update queue increases by this amount "       \
 135           "activate the next refinement thread if available. "              \
 136           "Will be selected ergonomically by default.")                     \
 137                                                                             \
 138   product(intx, G1RSetUpdatingPauseTimePercent, 10,                         \
 139           "A target percentage of time that is allowed to be spend on "     \
 140           "process RS update buffers during the collection pause.")         \
 141                                                                             \
 142   product(bool, G1UseAdaptiveConcRefinement, true,                          \
 143           "Select green, yellow and red zones adaptively to meet the "      \
 144           "the pause requirements.")                                        \
 145                                                                             \
 146   product(size_t, G1ConcRSLogCacheSize, 10,                                 \
 147           "Log base 2 of the length of conc RS hot-card cache.")            \
 148           range(0, 27)                                                      \
 149                                                                             \
 150   product(uintx, G1ConcRSHotCardLimit, 4,                                   \
 151           "The threshold that defines (>=) a hot card.")                    \
 152           range(0, max_jubyte)                                              \
 153                                                                             \
 154   develop(intx, G1RSetRegionEntriesBase, 256,                               \
 155           "Max number of regions in a fine-grain table per MB.")            \
 156                                                                             \
 157   product(intx, G1RSetRegionEntries, 0,                                     \
 158           "Max number of regions for which we keep bitmaps."                \
 159           "Will be set ergonomically by default")                           \
 160                                                                             \
 161   develop(intx, G1RSetSparseRegionEntriesBase, 4,                           \
 162           "Max number of entries per region in a sparse table "             \
 163           "per MB.")                                                        \
 164                                                                             \
 165   product(intx, G1RSetSparseRegionEntries, 0,                               \
 166           "Max number of entries per region in a sparse table."             \
 167           "Will be set ergonomically by default.")                          \
 168                                                                             \
 169   develop(bool, G1RecordHRRSOops, false,                                    \
 170           "When true, record recent calls to rem set operations.")          \
 171                                                                             \
 172   develop(bool, G1RecordHRRSEvents, false,                                  \


 175   develop(intx, G1MaxVerifyFailures, -1,                                    \
 176           "The maximum number of verification failures to print.  "         \
 177           "-1 means print all.")                                            \
 178                                                                             \
 179   develop(bool, G1ScrubRemSets, true,                                       \
 180           "When true, do RS scrubbing after cleanup.")                      \
 181                                                                             \
 182   develop(bool, G1RSScrubVerbose, false,                                    \
 183           "When true, do RS scrubbing with verbose output.")                \
 184                                                                             \
 185   develop(bool, G1YoungSurvRateVerbose, false,                              \
 186           "print out the survival rate of young regions according to age.") \
 187                                                                             \
 188   develop(intx, G1YoungSurvRateNumRegionsSummary, 0,                        \
 189           "the number of regions for which we'll print a surv rate "        \
 190           "summary.")                                                       \
 191                                                                             \
 192   product(uintx, G1ReservePercent, 10,                                      \
 193           "It determines the minimum reserve we should have in the heap "   \
 194           "to minimize the probability of promotion failure.")              \
 195           range(0, 100)                                                     \
 196                                                                             \
 197   diagnostic(bool, G1PrintHeapRegions, false,                               \
 198           "If set G1 will print information on which regions are being "    \
 199           "allocated and which are reclaimed.")                             \
 200                                                                             \
 201   develop(bool, G1HRRSUseSparseTable, true,                                 \
 202           "When true, use sparse table to save space.")                     \
 203                                                                             \
 204   develop(bool, G1HRRSFlushLogBuffersOnVerify, false,                       \
 205           "Forces flushing of log buffers before verification.")            \
 206                                                                             \
 207   develop(bool, G1FailOnFPError, false,                                     \
 208           "When set, G1 will fail when it encounters an FP 'error', "       \
 209           "so as to allow debugging")                                       \
 210                                                                             \
 211   product(size_t, G1HeapRegionSize, 0,                                      \
 212           "Size of the G1 regions.")                                        \
 213                                                                             \
 214   product(uintx, G1ConcRefinementThreads, 0,                                \
 215           "If non-0 is the number of parallel rem set update threads, "     \


 231                                                                             \
 232   develop(bool, G1StressConcRegionFreeing, false,                           \
 233           "It stresses the concurrent region freeing operation")            \
 234                                                                             \
 235   develop(uintx, G1StressConcRegionFreeingDelayMillis, 0,                   \
 236           "Artificial delay during concurrent region freeing")              \
 237                                                                             \
 238   develop(uintx, G1DummyRegionsPerGC, 0,                                    \
 239           "The number of dummy regions G1 will allocate at the end of "     \
 240           "each evacuation pause in order to artificially fill up the "     \
 241           "heap and stress the marking implementation.")                    \
 242                                                                             \
 243   develop(bool, G1ExitOnExpansionFailure, false,                            \
 244           "Raise a fatal VM exit out of memory failure in the event "       \
 245           " that heap expansion fails due to running out of swap.")         \
 246                                                                             \
 247   develop(uintx, G1ConcMarkForceOverflow, 0,                                \
 248           "The number of times we'll force an overflow during "             \
 249           "concurrent marking")                                             \
 250                                                                             \




 251   experimental(uintx, G1MaxNewSizePercent, 60,                              \
 252           "Percentage (0-100) of the heap size to use as default "          \
 253           " maximum young gen size.")                                       \
 254           range(0, 100)                                                     \
 255           constraint(G1MaxNewSizePercentConstraintFunc)                     \
 256                                                                             \
 257   experimental(uintx, G1NewSizePercent, 5,                                  \
 258           "Percentage (0-100) of the heap size to use as default "          \
 259           "minimum young gen size.")                                        \
 260           constraint(G1NewSizePercentConstraintFunc)                        \
 261                                                                             \
 262   experimental(uintx, G1MixedGCLiveThresholdPercent, 85,                    \
 263           "Threshold for regions to be considered for inclusion in the "    \
 264           "collection set of mixed GCs. "                                   \
 265           "Regions with live bytes exceeding this will not be collected.")  \
 266           range(0, 100)                                                     \
 267                                                                             \
 268   product(uintx, G1HeapWastePercent, 5,                                     \
 269           "Amount of space, expressed as a percentage of the heap size, "   \
 270           "that G1 is willing not to collect to avoid expensive GCs.")      \
 271           range(0, 100)                                                     \
 272                                                                             \
 273   product(uintx, G1MixedGCCountTarget, 8,                                   \
 274           "The target number of mixed GCs after a marking cycle.")          \
 275                                                                             \
 276   experimental(bool, G1EagerReclaimHumongousObjects, true,                  \
 277           "Try to reclaim dead large objects at every young GC.")           \
 278                                                                             \
 279   experimental(bool, G1EagerReclaimHumongousObjectsWithStaleRefs, true,     \
 280           "Try to reclaim dead large objects that have a few stale "        \
 281           "references at every young GC.")                                  \
 282                                                                             \
 283   experimental(bool, G1TraceEagerReclaimHumongousObjects, false,            \
 284           "Print some information about large object liveness "             \
 285           "at every young GC.")                                             \
 286                                                                             \
 287   experimental(uintx, G1OldCSetRegionThresholdPercent, 10,                  \
 288           "An upper bound for the number of old CSet regions expressed "    \
 289           "as a percentage of the heap size.")                              \
 290           range(0, 100)                                                     \
 291                                                                             \
 292   experimental(ccstr, G1LogLevel, NULL,                                     \
 293           "Log level for G1 logging: fine, finer, finest")                  \
 294                                                                             \
 295   notproduct(bool, G1EvacuationFailureALot, false,                          \
 296           "Force use of evacuation failure handling during certain "        \
 297           "evacuation pauses")                                              \
 298                                                                             \
 299   develop(uintx, G1EvacuationFailureALotCount, 1000,                        \
 300           "Number of successful evacuations between evacuation failures "   \
 301           "occurring at object copying")                                    \
 302                                                                             \
 303   develop(uintx, G1EvacuationFailureALotInterval, 5,                        \
 304           "Total collections between forced triggering of evacuation "      \
 305           "failures")                                                       \
 306                                                                             \
 307   develop(bool, G1EvacuationFailureALotDuringConcMark, true,                \
 308           "Force use of evacuation failure handling during evacuation "     \
 309           "pauses when marking is in progress")                             \
 310                                                                             \


 313           "evacuation pauses")                                              \
 314                                                                             \
 315   develop(bool, G1EvacuationFailureALotDuringYoungGC, true,                 \
 316           "Force use of evacuation failure handling during young "          \
 317           "evacuation pauses")                                              \
 318                                                                             \
 319   develop(bool, G1EvacuationFailureALotDuringMixedGC, true,                 \
 320           "Force use of evacuation failure handling during mixed "          \
 321           "evacuation pauses")                                              \
 322                                                                             \
 323   diagnostic(bool, G1VerifyRSetsDuringFullGC, false,                        \
 324           "If true, perform verification of each heap region's "            \
 325           "remembered set when verifying the heap during a full GC.")       \
 326                                                                             \
 327   diagnostic(bool, G1VerifyHeapRegionCodeRoots, false,                      \
 328           "Verify the code root lists attached to each heap region.")       \
 329                                                                             \
 330   develop(bool, G1VerifyBitmaps, false,                                     \
 331           "Verifies the consistency of the marking bitmaps")
 332 
 333 G1_FLAGS(DECLARE_DEVELOPER_FLAG, \
 334          DECLARE_PD_DEVELOPER_FLAG, \
 335          DECLARE_PRODUCT_FLAG, \
 336          DECLARE_PD_PRODUCT_FLAG, \
 337          DECLARE_DIAGNOSTIC_FLAG, \
 338          DECLARE_EXPERIMENTAL_FLAG, \
 339          DECLARE_NOTPRODUCT_FLAG, \
 340          DECLARE_MANAGEABLE_FLAG, \
 341          DECLARE_PRODUCT_RW_FLAG, \
 342          IGNORE_RANGE, \
 343          IGNORE_CONSTRAINT)
 344 
 345 #endif // SHARE_VM_GC_G1_G1_GLOBALS_HPP
src/share/vm/gc/g1/g1_globals.hpp
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