/*

 * Copyright (c) 2001, 2016, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#ifndef SHARE_VM_GC_G1_G1_GLOBALS_HPP

#define SHARE_VM_GC_G1_G1_GLOBALS_HPP

#include "runtime/globals.hpp"

#include <float.h> // for DBL_MAX

//

// Defines all globals flags used by the garbage-first compiler.

//

#define G1_FLAGS(develop, \

                 develop_pd, \

                 product, \

                 product_pd, \

                 diagnostic, \

                 diagnostic_pd, \

                 experimental, \

                 notproduct, \

                 manageable, \

                 product_rw, \

                 range, \

                 constraint, \

                 writeable) \

                                                                            \

  product(bool, G1UseAdaptiveIHOP, true,                                    \

          "Adaptively adjust the initiating heap occupancy from the "       \

          "initial value of InitiatingHeapOccupancyPercent. The policy "    \

          "attempts to start marking in time based on application "         \

          "behavior.")                                                      \

                                                                            \

  experimental(size_t, G1AdaptiveIHOPNumInitialSamples, 3,                  \

          "How many completed time periods from initial mark to first "     \

          "mixed gc are required to use the input values for prediction "   \

          "of the optimal occupancy to start marking.")                     \

          range(1, max_intx)                                                \

                                                                            \

  product(uintx, G1ConfidencePercent, 50,                                   \

          "Confidence level for MMU/pause predictions")                     \

          range(0, 100)                                                     \

                                                                            \

  develop(intx, G1MarkingOverheadPercent, 0,                                \

          "Overhead of concurrent marking")                                 \

          range(0, 100)                                                     \

                                                                            \

  diagnostic(intx, G1SummarizeRSetStatsPeriod, 0,                           \

          "The period (in number of GCs) at which we will generate "        \

          "update buffer processing info "                                  \

          "(0 means do not periodically generate this info); "              \

          "it also requires that logging is enabled on the trace"           \

          "level for gc+remset")                                            \

          range(0, max_intx)                                                \

                                                                            \

  product(double, G1ConcMarkStepDurationMillis, 10.0,                       \

          "Target duration of individual concurrent marking steps "         \

          "in milliseconds.")                                               \

          range(1.0, DBL_MAX)                                               \

                                                                            \

  product(intx, G1RefProcDrainInterval, 10,                                 \

          "The number of discovered reference objects to process before "   \

          "draining concurrent marking work queues.")                       \

          range(1, max_intx)                                                \

                                                                            \

  experimental(double, G1LastPLABAverageOccupancy, 50.0,                    \

               "The expected average occupancy of the last PLAB in "        \

               "percent.")                                                  \

               range(0.001, 100.0)                                          \

                                                                            \

  product(size_t, G1SATBBufferSize, 1*K,                                    \

          "Number of entries in an SATB log buffer.")                       \

          range(1, max_uintx)                                               \

                                                                            \

  develop(intx, G1SATBProcessCompletedThreshold, 20,                        \

          "Number of completed buffers that triggers log processing.")      \

          range(0, max_jint)                                                \

                                                                            \

  product(uintx, G1SATBBufferEnqueueingThresholdPercent, 60,                \

          "Before enqueueing them, each mutator thread tries to do some "   \

          "filtering on the SATB buffers it generates. If post-filtering "  \

          "the percentage of retained entries is over this threshold "      \

          "the buffer will be enqueued for processing. A value of 0 "       \

          "specifies that mutator threads should not do such filtering.")   \

          range(0, 100)                                                     \

                                                                            \

  experimental(intx, G1ExpandByPercentOfAvailable, 20,                      \

          "When expanding, % of uncommitted space to claim.")               \

          range(0, 100)                                                     \

                                                                            \

  develop(bool, G1RSBarrierRegionFilter, true,                              \

          "If true, generate region filtering code in RS barrier")          \

                                                                            \

  product(size_t, G1UpdateBufferSize, 256,                                  \

          "Size of an update buffer")                                       \

          range(1, NOT_LP64(32*M) LP64_ONLY(1*G))                           \

                                                                            \

  product(size_t, G1ConcRefinementYellowZone, 0,                            \

          "Number of enqueued update buffers that will "                    \

          "trigger concurrent processing. Will be selected ergonomically "  \

          "by default.")                                                    \

          range(0, max_intx)                                                \

                                                                            \

  product(size_t, G1ConcRefinementRedZone, 0,                               \

          "Maximum number of enqueued update buffers before mutator "       \

          "threads start processing new ones instead of enqueueing them. "  \

          "Will be selected ergonomically by default.")                     \

          range(0, max_intx)                                                \

                                                                            \

  product(size_t, G1ConcRefinementGreenZone, 0,                             \

          "The number of update buffers that are left in the queue by the " \

          "concurrent processing threads. Will be selected ergonomically "  \

          "by default.")                                                    \

          range(0, max_intx)                                                \

                                                                            \

  product(uintx, G1ConcRefinementServiceIntervalMillis, 300,                \

          "The last concurrent refinement thread wakes up every "           \

          "specified number of milliseconds to do miscellaneous work.")     \

          range(0, max_jint)                                                \

                                                                            \

  product(size_t, G1ConcRefinementThresholdStep, 2,                         \

          "Each time the rset update queue increases by this amount "       \

          "activate the next refinement thread if available. "              \

          "The actual step size will be selected ergonomically by "         \

          "default, with this value used to determine a lower bound.")      \

          range(1, SIZE_MAX)                                                \

                                                                            \

  product(intx, G1RSetUpdatingPauseTimePercent, 10,                         \

          "A target percentage of time that is allowed to be spend on "     \

          "process RS update buffers during the collection pause.")         \

          range(0, 100)                                                     \

                                                                            \

  product(bool, G1UseAdaptiveConcRefinement, true,                          \

          "Select green, yellow and red zones adaptively to meet the "      \

          "the pause requirements.")                                        \

                                                                            \

  product(size_t, G1ConcRSLogCacheSize, 10,                                 \

          "Log base 2 of the length of conc RS hot-card cache.")            \

          range(0, 27)                                                      \

                                                                            \

  product(uintx, G1ConcRSHotCardLimit, 4,                                   \

          "The threshold that defines (>=) a hot card.")                    \

          range(0, max_jubyte)                                              \

                                                                            \

  develop(intx, G1RSetRegionEntriesBase, 256,                               \

          "Max number of regions in a fine-grain table per MB.")            \

          range(1, max_jint/wordSize)                                       \

                                                                            \

  product(intx, G1RSetRegionEntries, 0,                                     \

          "Max number of regions for which we keep bitmaps."                \

          "Will be set ergonomically by default")                           \

          range(0, max_jint/wordSize)                                       \

          constraint(G1RSetRegionEntriesConstraintFunc,AfterErgo)           \

                                                                            \

  develop(intx, G1RSetSparseRegionEntriesBase, 4,                           \

          "Max number of entries per region in a sparse table "             \

          "per MB.")                                                        \

          range(1, max_jint/wordSize)                                       \

                                                                            \

  product(intx, G1RSetSparseRegionEntries, 0,                               \

          "Max number of entries per region in a sparse table."             \

          "Will be set ergonomically by default.")                          \

          range(0, max_jint/wordSize)                                       \

          constraint(G1RSetSparseRegionEntriesConstraintFunc,AfterErgo)     \

                                                                            \

  develop(intx, G1MaxVerifyFailures, -1,                                    \

          "The maximum number of verification failures to print.  "         \

          "-1 means print all.")                                            \

          range(-1, max_jint)                                               \

                                                                            \

  develop(bool, G1ScrubRemSets, true,                                       \

          "When true, do RS scrubbing after cleanup.")                      \

                                                                            \

  product(uintx, G1ReservePercent, 10,                                      \

          "It determines the minimum reserve we should have in the heap "   \

          "to minimize the probability of promotion failure.")              \

          range(0, 50)                                                      \

                                                                            \

  develop(bool, G1HRRSUseSparseTable, true,                                 \

          "When true, use sparse table to save space.")                     \

                                                                            \

  develop(bool, G1HRRSFlushLogBuffersOnVerify, false,                       \

          "Forces flushing of log buffers before verification.")            \

                                                                            \

  product(size_t, G1HeapRegionSize, 0,                                      \

          "Size of the G1 regions.")                                        \

          range(0, 32*M)                                                    \

          constraint(G1HeapRegionSizeConstraintFunc,AfterMemoryInit)        \

                                                                            \

  product(uint, G1ConcRefinementThreads, 0,                                 \

          "The number of parallel rem set update threads. "                 \

          "Will be set ergonomically by default.")                          \

          range(0, (max_jint-1)/wordSize)                                   \

                                                                            \

  develop(bool, G1VerifyCTCleanup, false,                                   \

          "Verify card table cleanup.")                                     \

                                                                            \

  product(size_t, G1RSetScanBlockSize, 64,                                  \

          "Size of a work unit of cards claimed by a worker thread"         \

          "during RSet scanning.")                                          \

          range(1, max_uintx)                                               \

                                                                            \

  develop(uintx, G1SecondaryFreeListAppendLength, 5,                        \

          "The number of regions we will add to the secondary free list "   \

          "at every append operation")                                      \

                                                                            \

  develop(bool, G1StressConcRegionFreeing, false,                           \

          "It stresses the concurrent region freeing operation")            \

                                                                            \

  develop(uintx, G1StressConcRegionFreeingDelayMillis, 0,                   \

          "Artificial delay during concurrent region freeing")              \

                                                                            \

  develop(uintx, G1DummyRegionsPerGC, 0,                                    \

          "The number of dummy regions G1 will allocate at the end of "     \

          "each evacuation pause in order to artificially fill up the "     \

          "heap and stress the marking implementation.")                    \

                                                                            \

  develop(bool, G1ExitOnExpansionFailure, false,                            \

          "Raise a fatal VM exit out of memory failure in the event "       \

          " that heap expansion fails due to running out of swap.")         \

                                                                            \

  experimental(uintx, G1MaxNewSizePercent, 60,                              \

          "Percentage (0-100) of the heap size to use as default "          \

          " maximum young gen size.")                                       \

          range(0, 100)                                                     \

          constraint(G1MaxNewSizePercentConstraintFunc,AfterErgo)           \

                                                                            \

  experimental(uintx, G1NewSizePercent, 5,                                  \

          "Percentage (0-100) of the heap size to use as default "          \

          "minimum young gen size.")                                        \

          range(0, 100)                                                     \

          constraint(G1NewSizePercentConstraintFunc,AfterErgo)              \

                                                                            \

  experimental(uintx, G1MixedGCLiveThresholdPercent, 85,                    \

          "Threshold for regions to be considered for inclusion in the "    \

          "collection set of mixed GCs. "                                   \

          "Regions with live bytes exceeding this will not be collected.")  \

          range(0, 100)                                                     \

                                                                            \

  product(uintx, G1HeapWastePercent, 5,                                     \

          "Amount of space, expressed as a percentage of the heap size, "   \

          "that G1 is willing not to collect to avoid expensive GCs.")      \

          range(0, 100)                                                     \

                                                                            \

  product(uintx, G1MixedGCCountTarget, 8,                                   \

          "The target number of mixed GCs after a marking cycle.")          \

          range(0, max_uintx)                                               \

                                                                            \

  experimental(bool, G1PretouchAuxiliaryMemory, false,                      \

          "Pre-touch large auxiliary data structures used by the GC.")      \

                                                                            \

  experimental(bool, G1EagerReclaimHumongousObjects, true,                  \

          "Try to reclaim dead large objects at every young GC.")           \

                                                                            \

  experimental(bool, G1EagerReclaimHumongousObjectsWithStaleRefs, true,     \

          "Try to reclaim dead large objects that have a few stale "        \

          "references at every young GC.")                                  \

                                                                            \

  experimental(uintx, G1OldCSetRegionThresholdPercent, 10,                  \

          "An upper bound for the number of old CSet regions expressed "    \

          "as a percentage of the heap size.")                              \

          range(0, 100)                                                     \

                                                                            \

  notproduct(bool, G1EvacuationFailureALot, false,                          \

          "Force use of evacuation failure handling during certain "        \

          "evacuation pauses")                                              \

                                                                            \

  develop(uintx, G1EvacuationFailureALotCount, 1000,                        \

          "Number of successful evacuations between evacuation failures "   \

          "occurring at object copying")                                    \

                                                                            \

  develop(uintx, G1EvacuationFailureALotInterval, 5,                        \

          "Total collections between forced triggering of evacuation "      \

          "failures")                                                       \

                                                                            \

  develop(bool, G1EvacuationFailureALotDuringConcMark, true,                \

          "Force use of evacuation failure handling during evacuation "     \

          "pauses when marking is in progress")                             \

                                                                            \

  develop(bool, G1EvacuationFailureALotDuringInitialMark, true,             \

          "Force use of evacuation failure handling during initial mark "   \

          "evacuation pauses")                                              \

                                                                            \

  develop(bool, G1EvacuationFailureALotDuringYoungGC, true,                 \

          "Force use of evacuation failure handling during young "          \

          "evacuation pauses")                                              \

                                                                            \

  develop(bool, G1EvacuationFailureALotDuringMixedGC, true,                 \

          "Force use of evacuation failure handling during mixed "          \

          "evacuation pauses")                                              \

                                                                            \

  diagnostic(bool, G1VerifyRSetsDuringFullGC, false,                        \

          "If true, perform verification of each heap region's "            \

          "remembered set when verifying the heap during a full GC.")       \

                                                                            \

  diagnostic(bool, G1VerifyHeapRegionCodeRoots, false,                      \

          "Verify the code root lists attached to each heap region.")       \

                                                                            \

  develop(bool, G1VerifyBitmaps, false,                                     \

          "Verifies the consistency of the marking bitmaps")

G1_FLAGS(DECLARE_DEVELOPER_FLAG, \

         DECLARE_PD_DEVELOPER_FLAG, \

         DECLARE_PRODUCT_FLAG, \

         DECLARE_PD_PRODUCT_FLAG, \

         DECLARE_DIAGNOSTIC_FLAG, \

         DECLARE_PD_DIAGNOSTIC_FLAG, \

         DECLARE_EXPERIMENTAL_FLAG, \

         DECLARE_NOTPRODUCT_FLAG, \

         DECLARE_MANAGEABLE_FLAG, \

         DECLARE_PRODUCT_RW_FLAG, \

         IGNORE_RANGE, \

         IGNORE_CONSTRAINT, \

         IGNORE_WRITEABLE)

#endif // SHARE_VM_GC_G1_G1_GLOBALS_HPP