1 /* 2 * Copyright (c) 2017, Red Hat, Inc. and/or its affiliates. 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 25 #include "precompiled.hpp" 26 #include "gc/shared/gcArguments.hpp" 27 #include "gc/serial/serialArguments.hpp" 28 #include "memory/allocation.inline.hpp" 29 #include "runtime/arguments.hpp" 30 #include "runtime/globals.hpp" 31 #include "runtime/globals_extension.hpp" 32 #include "runtime/java.hpp" 33 #include "runtime/os.hpp" 34 #include "utilities/defaultStream.hpp" 35 #include "utilities/macros.hpp" 36 37 #if INCLUDE_ALL_GCS 38 #include "gc/parallel/parallelArguments.hpp" 39 #include "gc/cms/cmsArguments.hpp" 40 #include "gc/g1/g1Arguments.hpp" 41 #endif 42 43 GCArguments* GCArguments::_instance = NULL; 44 45 GCArguments* GCArguments::arguments() { 46 assert(is_initialized(), "Heap factory not yet created"); 47 return _instance; 48 } 49 50 bool GCArguments::is_initialized() { 51 return _instance != NULL; 52 } 53 54 bool GCArguments::gc_selected() { 55 #if INCLUDE_ALL_GCS 56 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC; 57 #else 58 return UseSerialGC; 59 #endif // INCLUDE_ALL_GCS 60 } 61 62 void GCArguments::select_gc() { 63 if (!gc_selected()) { 64 select_gc_ergonomically(); 65 if (!gc_selected()) { 66 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL); 67 } 68 } 69 } 70 71 void GCArguments::select_gc_ergonomically() { 72 #if INCLUDE_ALL_GCS 73 if (os::is_server_class_machine()) { 74 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true); 75 } else { 76 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 77 } 78 #else 79 UNSUPPORTED_OPTION(UseG1GC); 80 UNSUPPORTED_OPTION(UseParallelGC); 81 UNSUPPORTED_OPTION(UseParallelOldGC); 82 UNSUPPORTED_OPTION(UseConcMarkSweepGC); 83 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 84 #endif // INCLUDE_ALL_GCS 85 } 86 87 void GCArguments::initialize_flags() { 88 #if INCLUDE_ALL_GCS 89 if (MinHeapFreeRatio == 100) { 90 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 91 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 92 } 93 94 // If class unloading is disabled, also disable concurrent class unloading. 95 if (!ClassUnloading) { 96 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false); 97 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false); 98 } 99 #endif // INCLUDE_ALL_GCS 100 } 101 102 jint GCArguments::initialize() { 103 assert(!is_initialized(), "GC arguments already initialized"); 104 105 select_gc(); 106 107 #if !INCLUDE_ALL_GCS 108 if (UseParallelGC || UseParallelOldGC) { 109 jio_fprintf(defaultStream::error_stream(), "UseParallelGC not supported in this VM.\n"); 110 return JNI_ERR; 111 } else if (UseG1GC) { 112 jio_fprintf(defaultStream::error_stream(), "UseG1GC not supported in this VM.\n"); 113 return JNI_ERR; 114 } else if (UseConcMarkSweepGC) { 115 jio_fprintf(defaultStream::error_stream(), "UseConcMarkSweepGC not supported in this VM.\n"); 116 return JNI_ERR; 117 #else 118 if (UseParallelGC || UseParallelOldGC) { 119 _instance = new ParallelArguments(); 120 } else if (UseG1GC) { 121 _instance = new G1Arguments(); 122 } else if (UseConcMarkSweepGC) { 123 _instance = new CMSArguments(); 124 #endif 125 } else if (UseSerialGC) { 126 _instance = new SerialArguments(); 127 } else { 128 ShouldNotReachHere(); 129 } 130 return JNI_OK; 131 }