1 /*
   2  * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 #ifndef SHARE_GC_Z_Z_GLOBALS_HPP
  25 #define SHARE_GC_Z_Z_GLOBALS_HPP
  26 
  27 #define GC_Z_FLAGS(develop,                                                 \
  28                    develop_pd,                                              \
  29                    product,                                                 \
  30                    product_pd,                                              \
  31                    diagnostic,                                              \
  32                    diagnostic_pd,                                           \
  33                    experimental,                                            \
  34                    notproduct,                                              \
  35                    manageable,                                              \
  36                    product_rw,                                              \
  37                    lp64_product,                                            \
  38                    range,                                                   \
  39                    constraint,                                              \
  40                    writeable)                                               \
  41                                                                             \
  42   product(ccstr, ZPath, NULL,                                               \
  43           "Filesystem path for Java heap backing storage "                  \
  44           "(must be a tmpfs or a hugetlbfs filesystem)")                    \
  45                                                                             \
  46   product(double, ZAllocationSpikeTolerance, 2.0,                           \
  47           "Allocation spike tolerance factor")                              \
  48                                                                             \
  49   product(double, ZFragmentationLimit, 25.0,                                \
  50           "Maximum allowed heap fragmentation")                             \
  51                                                                             \
  52   product(bool, ZStallOnOutOfMemory, true,                                  \
  53           "Allow Java threads to stall and wait for GC to complete "        \
  54           "instead of immediately throwing an OutOfMemoryError")            \
  55                                                                             \
  56   product(size_t, ZMarkStacksMax, NOT_LP64(512*M) LP64_ONLY(8*G),           \
  57           "Maximum number of bytes allocated for marking stacks")           \
  58           range(32*M, NOT_LP64(512*M) LP64_ONLY(1024*G))                    \
  59                                                                             \
  60   product(uint, ZCollectionInterval, 0,                                     \
  61           "Force GC at a fixed time interval (in seconds)")                 \
  62                                                                             \
  63   product(uint, ZStatisticsInterval, 10,                                    \
  64           "Time between statistics print outs (in seconds)")                \
  65           range(1, (uint)-1)                                                \
  66                                                                             \
  67   diagnostic(bool, ZStatisticsForceTrace, false,                            \
  68           "Force tracing of ZStats")                                        \
  69                                                                             \
  70   diagnostic(bool, ZProactive, true,                                        \
  71           "Enable proactive GC cycles")                                     \
  72                                                                             \
  73   diagnostic(bool, ZUnmapBadViews, false,                                   \
  74           "Unmap bad (inactive) heap views")                                \
  75                                                                             \
  76   diagnostic(bool, ZVerifyMarking, false,                                   \
  77           "Verify marking stacks")                                          \
  78                                                                             \
  79   diagnostic(bool, ZVerifyForwarding, false,                                \
  80           "Verify forwarding tables")                                       \
  81                                                                             \
  82   diagnostic(bool, ZWeakRoots, true,                                        \
  83           "Treat JNI WeakGlobalRefs and StringTable as weak roots")         \
  84                                                                             \
  85   diagnostic(bool, ZConcurrentStringTable, true,                            \
  86           "Clean StringTable concurrently")                                 \
  87                                                                             \
  88   diagnostic(bool, ZConcurrentVMWeakHandles, true,                          \
  89           "Clean VM WeakHandles concurrently")                              \
  90                                                                             \
  91   diagnostic(bool, ZConcurrentJNIWeakGlobalHandles, true,                   \
  92           "Clean JNI WeakGlobalRefs concurrently")                          \
  93                                                                             \
  94   diagnostic(bool, ZOptimizeLoadBarriers, true,                             \
  95           "Apply load barrier optimizations")                               \
  96                                                                             \
  97   develop(bool, ZVerifyLoadBarriers, false,                                 \
  98           "Verify that reference loads are followed by barriers")
  99 
 100 #endif // SHARE_GC_Z_Z_GLOBALS_HPP