src/hotspot/share/gc/shenandoah/shenandoah_globals.hpp
author rkennke
Tue, 02 Apr 2019 23:00:22 +0200
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permissions -rw-r--r--
8221766: Load-reference barriers for Shenandoah Reviewed-by: kvn, erikj, aph, shade
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/*
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 * Copyright (c) 2016, 2018, Red Hat, Inc. All rights reserved.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_GC_SHENANDOAH_SHENANDOAH_GLOBALS_HPP
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#define SHARE_GC_SHENANDOAH_SHENANDOAH_GLOBALS_HPP
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#define GC_SHENANDOAH_FLAGS(develop,                                        \
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                            develop_pd,                                     \
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                            product,                                        \
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                            product_pd,                                     \
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                            diagnostic,                                     \
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                            diagnostic_pd,                                  \
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                            experimental,                                   \
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                            notproduct,                                     \
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                            manageable,                                     \
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                            product_rw,                                     \
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                            lp64_product,                                   \
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                            range,                                          \
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                            constraint,                                     \
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                            writeable)                                      \
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                                                                            \
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  experimental(size_t, ShenandoahHeapRegionSize, 0,                         \
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          "Size of the Shenandoah regions. Set to zero to detect "          \
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          "automatically.")                                                 \
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                                                                            \
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  experimental(size_t, ShenandoahTargetNumRegions, 2048,                    \
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          "Target number of regions. We try to get around that many "       \
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          "regions, based on Shenandoah{Min,Max}RegionSize.")               \
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                                                                            \
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  experimental(size_t, ShenandoahMinRegionSize, 256 * K,                    \
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          "Minimum Shenandoah heap region size.")                           \
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                                                                            \
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  experimental(size_t, ShenandoahMaxRegionSize, 32 * M,                     \
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          "Maximum Shenandoah heap region size.")                           \
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                                                                            \
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  experimental(intx, ShenandoahHumongousThreshold, 100,                     \
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          "How large should the object be to get allocated in humongous "   \
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          "region, in percents of heap region size. This also caps the "    \
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          "maximum TLAB size.")                                             \
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          range(1, 100)                                                     \
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                                                                            \
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  experimental(ccstr, ShenandoahGCHeuristics, "adaptive",                   \
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          "The heuristics to use in Shenandoah GC. Possible values:"        \
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          " *) adaptive - adapt to maintain the given amount of free heap;" \
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          " *) static  -  start concurrent GC when static free heap "       \
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          "               threshold and static allocation threshold are "   \
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          "               tripped;"                                         \
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          " *) passive -  do not start concurrent GC, wait for Full GC; "   \
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          " *) aggressive - run concurrent GC continuously, evacuate "      \
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          "               everything;"                                      \
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          " *) compact - run GC with lower footprint target, may end up "   \
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          "               doing continuous GC, evacuate lots of live "      \
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          "               objects, uncommit heap aggressively;")            \
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                                                                            \
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  experimental(ccstr, ShenandoahUpdateRefsEarly, "adaptive",                \
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          "Run a separate concurrent reference updating phase after"        \
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          "concurrent evacuation. Possible values: 'on', 'off', 'adaptive'")\
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                                                                            \
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  experimental(uintx, ShenandoahRefProcFrequency, 5,                        \
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          "How often should (weak, soft, etc) references be processed. "    \
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          "References get processed at every Nth GC cycle. Set to zero "    \
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          "to disable reference processing.")                               \
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                                                                            \
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  experimental(uintx, ShenandoahUnloadClassesFrequency, 5,                  \
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          "How often should classes get unloaded. "                         \
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          "Class unloading is performed at every Nth GC cycle. "            \
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          "Set to zero to disable class unloading during concurrent GC.")   \
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                                                                            \
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  experimental(uintx, ShenandoahGarbageThreshold, 60,                       \
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          "Sets the percentage of garbage a region need to contain before " \
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          "it can be marked for collection. Does not apply to all "         \
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          "heuristics.")                                                    \
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          range(0,100)                                                      \
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                                                                            \
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  experimental(uintx, ShenandoahFreeThreshold, 10,                          \
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          "Set the percentage of free heap at which a GC cycle is started. "\
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          "Does not apply to all heuristics.")                              \
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          range(0,100)                                                      \
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                                                                            \
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  experimental(uintx, ShenandoahInitFreeThreshold, 70,                      \
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          "Initial remaining free heap threshold for learning steps in "    \
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          "heuristics. In percents of total heap size. Does not apply to "  \
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          "all heuristics.")                                                \
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          range(0,100)                                                      \
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                                                                            \
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  experimental(uintx, ShenandoahMinFreeThreshold, 10,                       \
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          "Minimum remaining free space threshold, after which collection " \
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          "definitely triggers. Does not apply to all heuristics.")         \
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          range(0,100)                                                      \
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                                                                            \
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  experimental(uintx, ShenandoahAllocationThreshold, 0,                     \
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   112
          "Set percentage of memory allocated since last GC cycle before "  \
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   113
          "a new GC cycle can be started. Set to zero to effectively "      \
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   114
          "disable.")                                                       \
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          range(0,100)                                                      \
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   116
                                                                            \
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   117
  experimental(uintx, ShenandoahLearningSteps, 5,                           \
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   118
          "Number of GC cycles to run in order to learn application "       \
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   119
          "and GC performance for adaptive heuristics.")                    \
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   120
          range(0,100)                                                      \
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   121
                                                                            \
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   122
  experimental(uintx, ShenandoahImmediateThreshold, 90,                     \
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   123
          "If mark identifies more than this much immediate garbage "       \
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   124
          "regions, it shall recycle them, and shall not continue the "     \
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diff changeset
   125
          "rest of the GC cycle. The value is in percents of total "        \
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diff changeset
   126
          "number of candidate regions for collection set. Setting this "   \
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   127
          "threshold to 100% effectively disables this shortcut.")          \
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   128
          range(0,100)                                                      \
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   129
                                                                            \
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   130
  experimental(uintx, ShenandoahMergeUpdateRefsMinGap, 100,                 \
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   131
          "If GC is currently running in separate update-refs mode "        \
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diff changeset
   132
          "this numbers gives the threshold when to switch to "             \
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diff changeset
   133
          "merged update-refs mode. Number is percentage relative to"       \
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diff changeset
   134
          "duration(marking)+duration(update-refs).")                       \
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   135
                                                                            \
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   136
  experimental(uintx, ShenandoahMergeUpdateRefsMaxGap, 200,                 \
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diff changeset
   137
          "If GC is currently running in merged update-refs mode "          \
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diff changeset
   138
          "this numbers gives the threshold when to switch to "             \
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diff changeset
   139
          "separate update-refs mode. Number is percentage relative "       \
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diff changeset
   140
          "to duration(marking)+duration(update-refs).")                    \
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   141
                                                                            \
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   142
  experimental(uintx, ShenandoahGuaranteedGCInterval, 5*60*1000,            \
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diff changeset
   143
          "Adaptive and dynamic heuristics would guarantee a GC cycle "     \
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   144
          "at least with this interval. This is useful when large idle"     \
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diff changeset
   145
          " intervals are present, where GC can run without stealing "      \
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diff changeset
   146
          "time from active application. Time is in milliseconds.")         \
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   147
                                                                            \
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   148
  experimental(bool, ShenandoahAlwaysClearSoftRefs, false,                  \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   149
          "Clear soft references always, instead of using any smart "       \
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   150
          "cleanup policy. This minimizes footprint at expense of more "    \
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diff changeset
   151
          "softref churn in applications.")                                 \
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   152
                                                                            \
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   153
  experimental(bool, ShenandoahUncommit, true,                              \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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   154
          "Allow Shenandoah to uncommit unused memory.")                    \
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   155
                                                                            \
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   156
  experimental(uintx, ShenandoahUncommitDelay, 5*60*1000,                   \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   157
          "Shenandoah would start to uncommit memory for regions that were" \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   158
          " not used for more than this time. First use after that would "  \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   159
          "incur allocation stalls. Actively used regions would never be "  \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   160
          "uncommitted, because they never decay. Time is in milliseconds." \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   161
          "Setting this delay to 0 effectively makes Shenandoah to "        \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   162
          "uncommit the regions almost immediately.")                       \
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   163
                                                                            \
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   164
  experimental(bool, ShenandoahRegionSampling, false,                       \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   165
          "Turns on heap region sampling via JVMStat")                      \
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diff changeset
   166
                                                                            \
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diff changeset
   167
  experimental(int, ShenandoahRegionSamplingRate, 40,                       \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   168
          "Sampling rate for heap region sampling. "                        \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   169
          "Number of milliseconds between samples")                         \
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   170
                                                                            \
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   171
  experimental(uintx, ShenandoahControlIntervalMin, 1,                      \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   172
          "The minumum sleep interval for control loop that drives "        \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   173
          "the cycles. Lower values would increase GC responsiveness "      \
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diff changeset
   174
          "to changing heap conditions, at the expense of higher perf "     \
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diff changeset
   175
          "overhead. Time is in milliseconds.")                             \
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   176
                                                                            \
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   177
  experimental(uintx, ShenandoahControlIntervalMax, 10,                     \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   178
          "The maximum sleep interval for control loop that drives "        \
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diff changeset
   179
          "the cycles. Lower values would increase GC responsiveness "      \
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diff changeset
   180
          "to changing heap conditions, at the expense of higher perf "     \
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diff changeset
   181
          "overhead. Time is in milliseconds.")                             \
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   182
                                                                            \
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diff changeset
   183
  experimental(uintx, ShenandoahControlIntervalAdjustPeriod, 1000,          \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   184
          "The time period for one step in control loop interval "          \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   185
          "adjustment. Lower values make adjustments faster, at the "       \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   186
          "expense of higher perf overhead. Time is in milliseconds.")      \
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   187
                                                                            \
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   188
  experimental(bool, ShenandoahCriticalControlThreadPriority, false,        \
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   189
          "Shenandoah control thread runs at critical scheduling priority.")\
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   190
                                                                            \
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   191
  diagnostic(bool, ShenandoahVerify, false,                                 \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   192
          "Verify the Shenandoah garbage collector")                        \
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diff changeset
   193
                                                                            \
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diff changeset
   194
  diagnostic(intx, ShenandoahVerifyLevel, 4,                                \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   195
          "Shenandoah verification level: "                                 \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   196
          "0 = basic heap checks; "                                         \
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diff changeset
   197
          "1 = previous level, plus basic region checks; "                  \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   198
          "2 = previous level, plus all roots; "                            \
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diff changeset
   199
          "3 = previous level, plus all reachable objects; "                \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   200
          "4 = previous level, plus all marked objects")                    \
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   201
                                                                            \
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diff changeset
   202
  diagnostic(bool, ShenandoahElasticTLAB, true,                             \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   203
          "Use Elastic TLABs with Shenandoah")                              \
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diff changeset
   204
                                                                            \
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diff changeset
   205
  diagnostic(bool, ShenandoahAllowMixedAllocs, true,                        \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   206
          "Allow mixing mutator and collector allocations in a single "     \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   207
          "region")                                                         \
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diff changeset
   208
                                                                            \
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diff changeset
   209
  experimental(uintx, ShenandoahAllocSpikeFactor, 5,                        \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   210
          "The amount of heap space to reserve for absorbing the "          \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   211
          "allocation spikes. Larger value wastes more memory in "          \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   212
          "non-emergency cases, but provides more safety in emergency "     \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   213
          "cases. In percents of total heap size.")                         \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   214
          range(0,100)                                                      \
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diff changeset
   215
                                                                            \
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diff changeset
   216
  experimental(uintx, ShenandoahEvacReserve, 5,                             \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   217
          "Maximum amount of free space to reserve for evacuation. "        \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   218
          "Larger values make GC more aggressive, while leaving less "      \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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parents:
diff changeset
   219
          "headroom for application to allocate in. "                       \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   220
          "In percents of total heap size.")                                \
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diff changeset
   221
          range(1,100)                                                      \
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   222
                                                                            \
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   223
  experimental(double, ShenandoahEvacWaste, 1.2,                            \
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   224
          "How much waste evacuations produce within the reserved "         \
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   225
          "space. Larger values make evacuations more resilient "           \
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   226
          "against allocation failures, at expense of smaller csets "       \
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   227
          "on each cycle.")                                                 \
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          range(1.0,100.0)                                                  \
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   229
                                                                            \
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   230
  experimental(bool, ShenandoahEvacReserveOverflow, true,                   \
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diff changeset
   231
          "Allow evacuations to overflow the reserved space. "              \
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diff changeset
   232
          "Enabling it will make evacuations more resilient when "          \
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   233
          "evacuation reserve/waste is incorrect, at the risk that "        \
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   234
          "application allocations run out of memory too early.")           \
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   235
                                                                            \
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  diagnostic(bool, ShenandoahAllocationTrace, false,                        \
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   237
          "Trace allocation latencies and stalls. Can be expensive when "   \
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          "lots of allocations happen, and may introduce scalability "      \
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diff changeset
   239
          "bottlenecks.")                                                   \
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   240
                                                                            \
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   241
  diagnostic(intx, ShenandoahAllocationStallThreshold, 10000,               \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   242
          "When allocation tracing is enabled, the allocation stalls "      \
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diff changeset
   243
          "larger than this threshold would be reported as warnings. "      \
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   244
          "Time is in microseconds.")                                       \
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   245
                                                                            \
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   246
  experimental(uintx, ShenandoahEvacAssist, 10,                             \
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          "How many objects to evacuate on LRB assist path. "               \
52925
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diff changeset
   248
          "Use zero to disable.")                                           \
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   249
                                                                            \
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   250
  experimental(bool, ShenandoahPacing, true,                                \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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   251
          "Pace application allocations to give GC chance to start "        \
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          "and complete before allocation failure is reached.")             \
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   253
                                                                            \
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  experimental(uintx, ShenandoahPacingMaxDelay, 10,                         \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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   255
          "Max delay for pacing application allocations. "                  \
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diff changeset
   256
          "Time is in milliseconds.")                                       \
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   257
                                                                            \
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   258
  experimental(uintx, ShenandoahPacingIdleSlack, 2,                         \
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diff changeset
   259
          "Percent of heap counted as non-taxable allocations during idle. "\
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diff changeset
   260
          "Larger value makes the pacing milder during idle phases, "       \
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diff changeset
   261
          "requiring less rendezvous with control thread. Lower value "     \
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diff changeset
   262
          "makes the pacing control less responsive to out-of-cycle allocs.")\
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          range(0, 100)                                                     \
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   264
                                                                            \
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   265
  experimental(uintx, ShenandoahPacingCycleSlack, 10,                       \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   266
          "Percent of free space taken as non-taxable allocations during "  \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   267
          "the GC cycle. Larger value makes the pacing milder at the "      \
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   268
          "beginning of the GC cycle. Lower value makes the pacing less "   \
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   269
          "uniform during the cycle.")                                      \
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   270
          range(0, 100)                                                     \
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   271
                                                                            \
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   272
  experimental(double, ShenandoahPacingSurcharge, 1.1,                      \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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   273
          "Additional pacing tax surcharge to help unclutter the heap. "    \
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diff changeset
   274
          "Larger values makes the pacing more aggressive. Lower values "   \
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diff changeset
   275
          "risk GC cycles finish with less memory than were available at "  \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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   276
          "the beginning of it.")                                           \
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   277
          range(1.0, 100.0)                                                 \
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   278
                                                                            \
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   279
  experimental(uintx, ShenandoahCriticalFreeThreshold, 1,                   \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   280
          "Percent of heap that needs to be free after recovery cycles, "   \
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diff changeset
   281
          "either Degenerated or Full GC. If this much space is not "       \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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   282
          "available, next recovery step would triggered.")                 \
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   283
          range(0, 100)                                                     \
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   284
                                                                            \
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   285
  diagnostic(bool, ShenandoahDegeneratedGC, true,                           \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   286
          "Use Degenerated GC as the graceful degradation step. Disabling " \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   287
          "this leads to degradation to Full GC")                           \
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diff changeset
   288
                                                                            \
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diff changeset
   289
  experimental(uintx, ShenandoahFullGCThreshold, 3,                         \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   290
          "How many back-to-back Degenerated GCs to do before triggering "  \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   291
          "a Full GC.")                                                     \
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diff changeset
   292
                                                                            \
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diff changeset
   293
  experimental(bool, ShenandoahImplicitGCInvokesConcurrent, false,          \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   294
          "Should internally-caused GCs invoke concurrent cycles, or go to" \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   295
          "stop-the-world (degenerated/full)?")                             \
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diff changeset
   296
                                                                            \
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diff changeset
   297
  experimental(bool, ShenandoahHumongousMoves, true,                        \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   298
          "Allow moving humongous regions. This makes GC more resistant "   \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   299
          "to external fragmentation that may otherwise fail other "        \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   300
          "humongous allocations, at the expense of higher GC copying "     \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   301
          "costs.")                                                         \
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   302
                                                                            \
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diff changeset
   303
  diagnostic(bool, ShenandoahOOMDuringEvacALot, false,                      \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   304
          "Simulate OOM during evacuation frequently.")                     \
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diff changeset
   305
                                                                            \
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diff changeset
   306
  diagnostic(bool, ShenandoahAllocFailureALot, false,                       \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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parents:
diff changeset
   307
          "Make lots of artificial allocation failures.")                   \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   308
                                                                            \
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diff changeset
   309
  diagnostic(bool, ShenandoahTerminationTrace, false,                       \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   310
          "Tracing task termination timings")                               \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   311
                                                                            \
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diff changeset
   312
  develop(bool, ShenandoahVerifyObjectEquals, false,                        \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   313
          "Verify that == and != are not used on oops. Only in fastdebug")  \
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diff changeset
   314
                                                                            \
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diff changeset
   315
  diagnostic(bool, ShenandoahAlwaysPreTouch, false,                         \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   316
          "Pre-touch heap memory, overrides global AlwaysPreTouch")         \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   317
                                                                            \
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diff changeset
   318
  experimental(intx, ShenandoahMarkScanPrefetch, 32,                        \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   319
          "How many objects to prefetch ahead when traversing mark bitmaps."\
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   320
          "Set to 0 to disable prefetching.")                               \
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diff changeset
   321
          range(0, 256)                                                     \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   322
                                                                            \
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diff changeset
   323
  experimental(uintx, ShenandoahMarkLoopStride, 1000,                       \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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parents:
diff changeset
   324
          "How many items are processed during one marking step")           \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   325
                                                                            \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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parents:
diff changeset
   326
  experimental(uintx, ShenandoahParallelRegionStride, 1024,                 \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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parents:
diff changeset
   327
          "How many regions are processed in one stride during parallel "   \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   328
          "iteration.")                                                     \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   329
                                                                            \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   330
  experimental(size_t, ShenandoahSATBBufferSize, 1 * K,                     \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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parents:
diff changeset
   331
          "Number of entries in an SATB log buffer.")                       \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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parents:
diff changeset
   332
          range(1, max_uintx)                                               \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   333
                                                                            \
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diff changeset
   334
  experimental(uintx, ShenandoahSATBBufferFlushInterval, 100,               \
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   335
          "Forcefully flush non-empty SATB buffers at this interval. "      \
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   336
          "Time is in milliseconds.")                                       \
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   337
                                                                            \
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   338
  experimental(uint, ShenandoahParallelSafepointThreads, 4,                 \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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   339
          "Number of parallel threads used for safepoint prolog/epilog")    \
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diff changeset
   340
                                                                            \
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diff changeset
   341
  experimental(bool, ShenandoahPreclean, true,                              \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   342
          "Do concurrent preclean phase before final mark: process "        \
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   343
          "definitely alive references to avoid dealing with them during "  \
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   344
          "pause.")                                                         \
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   345
                                                                            \
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   346
  experimental(bool, ShenandoahSuspendibleWorkers, false,                   \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   347
          "Suspend concurrent GC worker threads at safepoints")             \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   348
                                                                            \
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   349
  diagnostic(bool, ShenandoahSATBBarrier, true,                             \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   350
          "Turn on/off SATB barriers in Shenandoah")                        \
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diff changeset
   351
                                                                            \
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diff changeset
   352
  diagnostic(bool, ShenandoahKeepAliveBarrier, true,                        \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   353
          "Turn on/off keep alive barriers in Shenandoah")                  \
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diff changeset
   354
                                                                            \
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diff changeset
   355
  diagnostic(bool, ShenandoahStoreValEnqueueBarrier, false,                 \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   356
          "Turn on/off enqueuing of oops for storeval barriers")            \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   357
                                                                            \
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diff changeset
   358
  diagnostic(bool, ShenandoahCASBarrier, true,                              \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   359
          "Turn on/off CAS barriers in Shenandoah")                         \
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diff changeset
   360
                                                                            \
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diff changeset
   361
  diagnostic(bool, ShenandoahCloneBarrier, true,                            \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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parents:
diff changeset
   362
          "Turn on/off clone barriers in Shenandoah")                       \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   363
                                                                            \
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   364
  diagnostic(bool, ShenandoahLoadRefBarrier, true,                          \
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diff changeset
   365
          "Turn on/off load-reference barriers in Shenandoah")              \
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diff changeset
   366
                                                                            \
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diff changeset
   367
  diagnostic(bool, ShenandoahStoreCheck, false,                             \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   368
          "Emit additional code that checks objects are written to only"    \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   369
          " in to-space")                                                   \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   370
                                                                            \
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diff changeset
   371
  experimental(bool, ShenandoahConcurrentScanCodeRoots, true,               \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   372
          "Scan code roots concurrently, instead of during a pause")        \
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diff changeset
   373
                                                                            \
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diff changeset
   374
  experimental(uintx, ShenandoahCodeRootsStyle, 2,                          \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   375
          "Use this style to scan code cache:"                              \
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diff changeset
   376
          " 0 - sequential iterator;"                                       \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   377
          " 1 - parallel iterator;"                                         \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   378
          " 2 - parallel iterator with cset filters;")                      \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   379
                                                                            \
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diff changeset
   380
  experimental(bool, ShenandoahOptimizeStaticFinals, true,                  \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   381
          "Optimize barriers on static final fields. "                      \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   382
          "Turn it off for maximum compatibility with reflection or JNI "   \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   383
          "code that manipulates final fields.")                            \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   384
                                                                            \
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diff changeset
   385
  experimental(bool, ShenandoahOptimizeInstanceFinals, false,               \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   386
          "Optimize barriers on final instance fields."                     \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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parents:
diff changeset
   387
          "Turn it off for maximum compatibility with reflection or JNI "   \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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parents:
diff changeset
   388
          "code that manipulates final fields.")                            \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   389
                                                                            \
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diff changeset
   390
  experimental(bool, ShenandoahOptimizeStableFinals, false,                 \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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parents:
diff changeset
   391
          "Optimize barriers on stable fields."                             \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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parents:
diff changeset
   392
          "Turn it off for maximum compatibility with reflection or JNI "   \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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parents:
diff changeset
   393
          "code that manipulates final fields.")                            \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   394
                                                                            \
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diff changeset
   395
  experimental(bool, ShenandoahCommonGCStateLoads, false,                   \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   396
         "Enable commonming for GC state loads in generated code.")         \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff changeset
   397
                                                                            \
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diff changeset
   398
  develop(bool, ShenandoahVerifyOptoBarriers, false,                        \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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parents:
diff changeset
   399
          "Verify no missing barriers in C2")                               \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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parents:
diff changeset
   400
                                                                            \
9c18c9d839d3 8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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parents:
diff changeset
   401
  experimental(bool, ShenandoahLoopOptsAfterExpansion, true,                \
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6c0ab8bd8da5 8221766: Load-reference barriers for Shenandoah
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parents: 53403
diff changeset
   402
          "Attempt more loop opts after barrier expansion")                 \
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diff changeset
   403
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   404
#endif // SHARE_GC_SHENANDOAH_SHENANDOAH_GLOBALS_HPP