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 #include "precompiled.hpp" 25 26 #include "memory/metaspace/chunkAllocSequence.hpp" 27 #include "memory/metaspace/chunkLevel.hpp" 28 #include "utilities/globalDefinitions.hpp" 29 30 namespace metaspace { 31 32 33 // A chunk allocation sequence which can be encoded with a simple const array. 34 class ConstantChunkAllocSequence : public ChunkAllocSequence { 35 36 // integer array specifying chunk level allocation progression. 37 // Last chunk is to be an endlessly repeated allocation. 38 const chklvl_t* const _entries; 39 const int _num_entries; 40 41 public: 42 43 ConstantChunkAllocSequence(const chklvl_t* array, int num_entries) 44 : _entries(array) 45 , _num_entries(num_entries) 46 { 47 assert(_num_entries > 0, "must not be empty."); 48 } 49 50 chklvl_t get_next_chunk_level(int num_allocated) const { 51 if (num_allocated >= _num_entries) { 52 // Caller shall repeat last allocation 53 return _entries[_num_entries - 1]; 54 } 55 return _entries[_num_entries]; 56 } 57 58 }; 59 60 // hard-coded chunk allocation sequences for various space types 61 62 /////////////////////////// 63 // chunk allocation sequences for normal loaders: 64 static const chklvl_t g_sequ_standard_nonclass[] = { 65 CHUNK_LEVEL_4K, CHUNK_LEVEL_4K, CHUNK_LEVEL_4K, CHUNK_LEVEL_4K, 66 CHUNK_LEVEL_64K, 67 -1 // .. repeat last 68 }; 69 70 static const chklvl_t g_sequ_standard_class[] = { 71 CHUNK_LEVEL_4K, CHUNK_LEVEL_4K, CHUNK_LEVEL_4K, CHUNK_LEVEL_4K, 72 CHUNK_LEVEL_32K, 73 -1 // .. repeat last 74 }; 75 76 /////////////////////////// 77 // chunk allocation sequences for reflection/anonymous loaders: 78 // We allocate four smallish chunks before progressing to bigger chunks. 79 static const chklvl_t g_sequ_anon_nonclass[] = { 80 CHUNK_LEVEL_1K, CHUNK_LEVEL_1K, CHUNK_LEVEL_1K, CHUNK_LEVEL_1K, 81 CHUNK_LEVEL_4K, 82 -1 // .. repeat last 83 }; 84 85 static const chklvl_t g_sequ_anon_class[] = { 86 CHUNK_LEVEL_1K, CHUNK_LEVEL_1K, CHUNK_LEVEL_1K, CHUNK_LEVEL_1K, 87 CHUNK_LEVEL_4K, 88 -1 // .. repeat last 89 }; 90 91 #define DEFINE_CLASS_FOR_ARRAY(what) \ 92 static ConstantChunkAllocSequence g_chunk_alloc_sequence_##what (g_sequ_##what, sizeof(g_sequ_##what)/sizeof(int)); 93 94 DEFINE_CLASS_FOR_ARRAY(standard_nonclass) 95 DEFINE_CLASS_FOR_ARRAY(standard_class) 96 DEFINE_CLASS_FOR_ARRAY(anon_nonclass) 97 DEFINE_CLASS_FOR_ARRAY(anon_class) 98 99 100 class BootLoaderChunkAllocSequence : public ChunkAllocSequence { 101 102 // For now, this mirrors what the old code did 103 // (see SpaceManager::get_initial_chunk_size() and SpaceManager::calc_chunk_size). 104 105 // Not sure how much sense this still makes, especially with CDS - by default we 106 // now load JDK classes from CDS and therefore most of the boot loader 107 // chunks remain unoccupied. 108 109 // Also, InitialBootClassLoaderMetaspaceSize was/is confusing since it only applies 110 // to the non-class chunk. 111 112 const bool _is_class; 113 114 static chklvl_t calc_initial_chunk_level(bool is_class) { 115 116 size_t word_size = 0; 117 if (is_class) { 118 // In the old version first class space chunk for boot loader was always medium class chunk size * 6. 119 word_size = 32 * K * 6; 120 121 } else { 122 assert(InitialBootClassLoaderMetaspaceSize < MAX_CHUNK_BYTE_SIZE, 123 "InitialBootClassLoaderMetaspaceSize too large"); 124 word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord; 125 } 126 return level_fitting_word_size(word_size); 127 } 128 129 public: 130 131 BootLoaderChunkAllocSequence(bool is_class) 132 : _is_class(is_class) 133 {} 134 135 chklvl_t get_next_chunk_level(int num_allocated) const { 136 if (num_allocated == 0) { 137 return calc_initial_chunk_level(_is_class); 138 } 139 // bit arbitrary, but this is what the old code did. Can tweak later if needed. 140 return CHUNK_LEVEL_64K; 141 } 142 143 }; 144 145 static BootLoaderChunkAllocSequence g_chunk_alloc_sequence_boot_non_class(false); 146 static BootLoaderChunkAllocSequence g_chunk_alloc_sequence_boot_class(true); 147 148 149 const ChunkAllocSequence* ChunkAllocSequence::alloc_sequence_by_space_type(Metaspace::MetaspaceType space_type, bool is_class) { 150 151 if (is_class) { 152 switch(space_type) { 153 case Metaspace::StandardMetaspaceType: return &g_chunk_alloc_sequence_standard_class; 154 case Metaspace::ReflectionMetaspaceType: 155 case Metaspace::UnsafeAnonymousMetaspaceType: return &g_chunk_alloc_sequence_anon_class; 156 case Metaspace::BootMetaspaceType: return &g_chunk_alloc_sequence_boot_non_class; 157 default: ShouldNotReachHere(); 158 } 159 } else { 160 switch(space_type) { 161 case Metaspace::StandardMetaspaceType: return &g_chunk_alloc_sequence_standard_class; 162 case Metaspace::ReflectionMetaspaceType: 163 case Metaspace::UnsafeAnonymousMetaspaceType: return &g_chunk_alloc_sequence_anon_class; 164 case Metaspace::BootMetaspaceType: return &g_chunk_alloc_sequence_boot_class; 165 default: ShouldNotReachHere(); 166 } 167 } 168 169 return NULL; 170 171 } 172 173 174 175 } // namespace metaspace 176