annotate src/share/vm/memory/allocation.inline.hpp @ 20304:a22acf6d7598

8048112: G1 Full GC needs to support the case when the very first region is not available Summary: Refactor preparation for compaction during Full GC so that it lazily initializes the first compaction point. This also avoids problems later when the first region may not be committed. Also reviewed by K. Barrett. Reviewed-by: brutisso
author tschatzl
date Mon, 21 Jul 2014 10:00:31 +0200
parents 9758d9f36299
children 833b0f92429a
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1 /*
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_MEMORY_ALLOCATION_INLINE_HPP
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26 #define SHARE_VM_MEMORY_ALLOCATION_INLINE_HPP
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27
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28 #include "runtime/atomic.inline.hpp"
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29 #include "runtime/os.hpp"
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30
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31 // Explicit C-heap memory management
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32
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33 void trace_heap_malloc(size_t size, const char* name, void *p);
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34 void trace_heap_free(void *p);
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35
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36 #ifndef PRODUCT
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37 // Increments unsigned long value for statistics (not atomic on MP).
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38 inline void inc_stat_counter(volatile julong* dest, julong add_value) {
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39 #if defined(SPARC) || defined(X86)
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40 // Sparc and X86 have atomic jlong (8 bytes) instructions
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41 julong value = Atomic::load((volatile jlong*)dest);
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42 value += add_value;
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43 Atomic::store((jlong)value, (volatile jlong*)dest);
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44 #else
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45 // possible word-tearing during load/store
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46 *dest += add_value;
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47 #endif
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48 }
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49 #endif
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50
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51 // allocate using malloc; will fail if no memory available
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52 inline char* AllocateHeap(size_t size, MEMFLAGS flags, address pc = 0,
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53 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) {
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54 if (pc == 0) {
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55 pc = CURRENT_PC;
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56 }
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57 char* p = (char*) os::malloc(size, flags, pc);
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58 #ifdef ASSERT
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59 if (PrintMallocFree) trace_heap_malloc(size, "AllocateHeap", p);
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60 #endif
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61 if (p == NULL && alloc_failmode == AllocFailStrategy::EXIT_OOM) {
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62 vm_exit_out_of_memory(size, OOM_MALLOC_ERROR, "AllocateHeap");
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63 }
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64 return p;
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65 }
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66
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67 inline char* ReallocateHeap(char *old, size_t size, MEMFLAGS flags,
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68 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) {
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69 char* p = (char*) os::realloc(old, size, flags, CURRENT_PC);
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70 #ifdef ASSERT
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71 if (PrintMallocFree) trace_heap_malloc(size, "ReallocateHeap", p);
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72 #endif
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73 if (p == NULL && alloc_failmode == AllocFailStrategy::EXIT_OOM) {
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74 vm_exit_out_of_memory(size, OOM_MALLOC_ERROR, "ReallocateHeap");
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75 }
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76 return p;
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77 }
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78
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79 inline void FreeHeap(void* p, MEMFLAGS memflags = mtInternal) {
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80 #ifdef ASSERT
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81 if (PrintMallocFree) trace_heap_free(p);
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82 #endif
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83 os::free(p, memflags);
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84 }
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85
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86
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87 template <MEMFLAGS F> void* CHeapObj<F>::operator new(size_t size,
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88 address caller_pc) throw() {
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89 void* p = (void*)AllocateHeap(size, F, (caller_pc != 0 ? caller_pc : CALLER_PC));
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90 #ifdef ASSERT
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91 if (PrintMallocFree) trace_heap_malloc(size, "CHeapObj-new", p);
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92 #endif
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93 return p;
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94 }
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95
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96 template <MEMFLAGS F> void* CHeapObj<F>::operator new (size_t size,
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97 const std::nothrow_t& nothrow_constant, address caller_pc) throw() {
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98 void* p = (void*)AllocateHeap(size, F, (caller_pc != 0 ? caller_pc : CALLER_PC),
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99 AllocFailStrategy::RETURN_NULL);
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100 #ifdef ASSERT
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101 if (PrintMallocFree) trace_heap_malloc(size, "CHeapObj-new", p);
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102 #endif
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103 return p;
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104 }
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105
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106 template <MEMFLAGS F> void* CHeapObj<F>::operator new [](size_t size,
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107 address caller_pc) throw() {
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108 return CHeapObj<F>::operator new(size, caller_pc);
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109 }
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110
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111 template <MEMFLAGS F> void* CHeapObj<F>::operator new [](size_t size,
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112 const std::nothrow_t& nothrow_constant, address caller_pc) throw() {
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113 return CHeapObj<F>::operator new(size, nothrow_constant, caller_pc);
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114 }
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115
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116 template <MEMFLAGS F> void CHeapObj<F>::operator delete(void* p){
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117 FreeHeap(p, F);
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118 }
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119
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120 template <MEMFLAGS F> void CHeapObj<F>::operator delete [](void* p){
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121 FreeHeap(p, F);
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122 }
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123
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124 template <class E, MEMFLAGS F>
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125 E* ArrayAllocator<E, F>::allocate(size_t length) {
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126 assert(_addr == NULL, "Already in use");
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127
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128 _size = sizeof(E) * length;
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129 _use_malloc = _size < ArrayAllocatorMallocLimit;
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130
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131 if (_use_malloc) {
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132 _addr = AllocateHeap(_size, F);
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133 if (_addr == NULL && _size >= (size_t)os::vm_allocation_granularity()) {
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134 // malloc failed let's try with mmap instead
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135 _use_malloc = false;
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136 } else {
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137 return (E*)_addr;
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138 }
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139 }
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140
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141 int alignment = os::vm_allocation_granularity();
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142 _size = align_size_up(_size, alignment);
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143
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144 _addr = os::reserve_memory(_size, NULL, alignment, F);
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145 if (_addr == NULL) {
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146 vm_exit_out_of_memory(_size, OOM_MMAP_ERROR, "Allocator (reserve)");
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147 }
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148
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149 os::commit_memory_or_exit(_addr, _size, !ExecMem, "Allocator (commit)");
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150
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151 return (E*)_addr;
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152 }
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153
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154 template<class E, MEMFLAGS F>
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155 void ArrayAllocator<E, F>::free() {
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156 if (_addr != NULL) {
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157 if (_use_malloc) {
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158 FreeHeap(_addr, F);
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159 } else {
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160 os::release_memory(_addr, _size);
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161 }
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162 _addr = NULL;
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163 }
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164 }
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165
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166 #endif // SHARE_VM_MEMORY_ALLOCATION_INLINE_HPP