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20360
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1 /*
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2 * Copyright (c) 2014, 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_SERVICES_MALLOC_TRACKER_HPP
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26 #define SHARE_VM_SERVICES_MALLOC_TRACKER_HPP
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27
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28 #if INCLUDE_NMT
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29
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30 #include "memory/allocation.hpp"
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31 #include "runtime/atomic.hpp"
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32 #include "services/nmtCommon.hpp"
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33 #include "utilities/nativeCallStack.hpp"
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34
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35 /*
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36 * This counter class counts memory allocation and deallocation,
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37 * records total memory allocation size and number of allocations.
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38 * The counters are updated atomically.
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39 */
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40 class MemoryCounter VALUE_OBJ_CLASS_SPEC {
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41 private:
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42 size_t _count;
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43 size_t _size;
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44
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45 DEBUG_ONLY(size_t _peak_count;)
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46 DEBUG_ONLY(size_t _peak_size; )
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47
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48 public:
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49 MemoryCounter() : _count(0), _size(0) {
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50 DEBUG_ONLY(_peak_count = 0;)
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51 DEBUG_ONLY(_peak_size = 0;)
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52 }
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53
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54 // Reset counters
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55 void reset() {
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56 _size = 0;
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57 _count = 0;
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58 DEBUG_ONLY(_peak_size = 0;)
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59 DEBUG_ONLY(_peak_count = 0;)
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60 }
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61
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62 inline void allocate(size_t sz) {
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63 Atomic::add(1, (volatile MemoryCounterType*)&_count);
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64 if (sz > 0) {
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65 Atomic::add((MemoryCounterType)sz, (volatile MemoryCounterType*)&_size);
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66 DEBUG_ONLY(_peak_size = MAX2(_peak_size, _size));
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67 }
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68 DEBUG_ONLY(_peak_count = MAX2(_peak_count, _count);)
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69 }
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70
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71 inline void deallocate(size_t sz) {
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72 assert(_count > 0, "Negative counter");
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73 assert(_size >= sz, "Negative size");
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74 Atomic::add(-1, (volatile MemoryCounterType*)&_count);
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75 if (sz > 0) {
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76 Atomic::add(-(MemoryCounterType)sz, (volatile MemoryCounterType*)&_size);
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77 }
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78 }
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79
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80 inline void resize(long sz) {
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81 if (sz != 0) {
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82 Atomic::add((MemoryCounterType)sz, (volatile MemoryCounterType*)&_size);
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83 DEBUG_ONLY(_peak_size = MAX2(_size, _peak_size);)
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84 }
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85 }
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86
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87 inline size_t count() const { return _count; }
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88 inline size_t size() const { return _size; }
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89 DEBUG_ONLY(inline size_t peak_count() const { return _peak_count; })
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90 DEBUG_ONLY(inline size_t peak_size() const { return _peak_size; })
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91
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92 };
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93
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94 /*
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95 * Malloc memory used by a particular subsystem.
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96 * It includes the memory acquired through os::malloc()
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97 * call and arena's backing memory.
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98 */
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99 class MallocMemory VALUE_OBJ_CLASS_SPEC {
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100 private:
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101 MemoryCounter _malloc;
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102 MemoryCounter _arena;
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103
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104 public:
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105 MallocMemory() { }
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106
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107 inline void record_malloc(size_t sz) {
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108 _malloc.allocate(sz);
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109 }
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110
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111 inline void record_free(size_t sz) {
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112 _malloc.deallocate(sz);
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113 }
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114
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115 inline void record_new_arena() {
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116 _arena.allocate(0);
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117 }
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118
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119 inline void record_arena_free() {
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120 _arena.deallocate(0);
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121 }
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122
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123 inline void record_arena_size_change(long sz) {
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124 _arena.resize(sz);
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125 }
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126
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127 void reset() {
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128 _malloc.reset();
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129 _arena.reset();
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130 }
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131
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132 inline size_t malloc_size() const { return _malloc.size(); }
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133 inline size_t malloc_count() const { return _malloc.count();}
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134 inline size_t arena_size() const { return _arena.size(); }
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135 inline size_t arena_count() const { return _arena.count(); }
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136
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137 DEBUG_ONLY(inline const MemoryCounter& malloc_counter() const { return _malloc; })
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138 DEBUG_ONLY(inline const MemoryCounter& arena_counter() const { return _arena; })
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139 };
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140
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141 class MallocMemorySummary;
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142
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143 // A snapshot of malloc'd memory, includes malloc memory
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144 // usage by types and memory used by tracking itself.
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145 class MallocMemorySnapshot : public ResourceObj {
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146 friend class MallocMemorySummary;
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147
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148 private:
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149 MallocMemory _malloc[mt_number_of_types];
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150 MemoryCounter _tracking_header;
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151
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152
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153 public:
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154 inline MallocMemory* by_type(MEMFLAGS flags) {
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155 int index = NMTUtil::flag_to_index(flags);
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156 return &_malloc[index];
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157 }
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158
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159 inline MallocMemory* by_index(int index) {
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160 assert(index >= 0, "Index out of bound");
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161 assert(index < mt_number_of_types, "Index out of bound");
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162 return &_malloc[index];
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163 }
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164
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165 inline MemoryCounter* malloc_overhead() {
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166 return &_tracking_header;
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167 }
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168
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169 // Total malloc'd memory amount
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170 size_t total() const;
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171 // Total malloc'd memory used by arenas
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172 size_t total_arena() const;
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173
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20366
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174 inline size_t thread_count() const {
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175 MallocMemorySnapshot* s = const_cast<MallocMemorySnapshot*>(this);
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176 return s->by_type(mtThreadStack)->malloc_count();
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20360
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177 }
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178
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179 void reset();
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180
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181 void copy_to(MallocMemorySnapshot* s) {
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182 s->_tracking_header = _tracking_header;
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183 for (int index = 0; index < mt_number_of_types; index ++) {
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184 s->_malloc[index] = _malloc[index];
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185 }
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186 }
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187
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188 // Make adjustment by subtracting chunks used by arenas
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189 // from total chunks to get total free chunk size
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190 void make_adjustment();
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191 };
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192
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193 /*
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194 * This class is for collecting malloc statistics at summary level
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195 */
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196 class MallocMemorySummary : AllStatic {
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197 private:
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198 // Reserve memory for placement of MallocMemorySnapshot object
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199 static size_t _snapshot[CALC_OBJ_SIZE_IN_TYPE(MallocMemorySnapshot, size_t)];
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200
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201 public:
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202 static void initialize();
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203
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204 static inline void record_malloc(size_t size, MEMFLAGS flag) {
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205 as_snapshot()->by_type(flag)->record_malloc(size);
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206 }
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207
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208 static inline void record_free(size_t size, MEMFLAGS flag) {
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209 as_snapshot()->by_type(flag)->record_free(size);
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210 }
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211
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212 static inline void record_new_arena(MEMFLAGS flag) {
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213 as_snapshot()->by_type(flag)->record_new_arena();
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214 }
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215
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216 static inline void record_arena_free(MEMFLAGS flag) {
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217 as_snapshot()->by_type(flag)->record_arena_free();
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218 }
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219
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220 static inline void record_arena_size_change(long size, MEMFLAGS flag) {
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221 as_snapshot()->by_type(flag)->record_arena_size_change(size);
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222 }
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223
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224 static void snapshot(MallocMemorySnapshot* s) {
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225 as_snapshot()->copy_to(s);
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226 s->make_adjustment();
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227 }
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228
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229 // Record memory used by malloc tracking header
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230 static inline void record_new_malloc_header(size_t sz) {
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231 as_snapshot()->malloc_overhead()->allocate(sz);
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232 }
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233
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234 static inline void record_free_malloc_header(size_t sz) {
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235 as_snapshot()->malloc_overhead()->deallocate(sz);
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236 }
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237
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238 // The memory used by malloc tracking headers
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239 static inline size_t tracking_overhead() {
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240 return as_snapshot()->malloc_overhead()->size();
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241 }
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242
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243 // Reset all counters to zero
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244 static void reset() {
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245 as_snapshot()->reset();
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246 }
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247
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248 static MallocMemorySnapshot* as_snapshot() {
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249 return (MallocMemorySnapshot*)_snapshot;
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250 }
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251 };
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252
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253
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254 /*
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255 * Malloc tracking header.
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256 * To satisfy malloc alignment requirement, NMT uses 2 machine words for tracking purpose,
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257 * which ensures 8-bytes alignment on 32-bit systems and 16-bytes on 64-bit systems (Product build).
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258 */
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259
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260 class MallocHeader VALUE_OBJ_CLASS_SPEC {
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261 #ifdef _LP64
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262 size_t _size : 62;
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263 size_t _level : 2;
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264 size_t _flags : 8;
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265 size_t _pos_idx : 16;
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266 size_t _bucket_idx: 40;
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267 #define MAX_MALLOCSITE_TABLE_SIZE ((size_t)1 << 40)
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268 #define MAX_BUCKET_LENGTH ((size_t)(1 << 16))
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269 #define MAX_MALLOC_SIZE (((size_t)1 << 62) - 1)
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270 #else
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271 size_t _size : 30;
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272 size_t _level : 2;
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273 size_t _flags : 8;
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274 size_t _pos_idx : 8;
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275 size_t _bucket_idx: 16;
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276 #define MAX_MALLOCSITE_TABLE_SIZE ((size_t)(1 << 16))
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277 #define MAX_BUCKET_LENGTH ((size_t)(1 << 8))
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278 // Max malloc size = 1GB - 1 on 32 bit system, such has total 4GB memory
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279 #define MAX_MALLOC_SIZE ((size_t)(1 << 30) - 1)
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280 #endif // _LP64
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281
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282 public:
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283 // Summary tracking header
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284 MallocHeader(size_t size, MEMFLAGS flags) {
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285 assert(sizeof(MallocHeader) == sizeof(void*) * 2,
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286 "Wrong header size");
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287
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288 _level = NMT_summary;
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289 _flags = flags;
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290 set_size(size);
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291 MallocMemorySummary::record_malloc(size, flags);
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292 MallocMemorySummary::record_new_malloc_header(sizeof(MallocHeader));
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293 }
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294 // Detail tracking header
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295 MallocHeader(size_t size, MEMFLAGS flags, const NativeCallStack& stack) {
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296 assert(sizeof(MallocHeader) == sizeof(void*) * 2,
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297 "Wrong header size");
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298
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299 _level = NMT_detail;
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300 _flags = flags;
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301 set_size(size);
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302 size_t bucket_idx;
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303 size_t pos_idx;
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304 if (record_malloc_site(stack, size, &bucket_idx, &pos_idx)) {
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305 assert(bucket_idx <= MAX_MALLOCSITE_TABLE_SIZE, "Overflow bucket index");
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306 assert(pos_idx <= MAX_BUCKET_LENGTH, "Overflow bucket position index");
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307 _bucket_idx = bucket_idx;
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308 _pos_idx = pos_idx;
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309 }
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310 MallocMemorySummary::record_malloc(size, flags);
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311 MallocMemorySummary::record_new_malloc_header(sizeof(MallocHeader));
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312 }
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313 // Minimal tracking header
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314 MallocHeader() {
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315 assert(sizeof(MallocHeader) == sizeof(void*) * 2,
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316 "Wrong header size");
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317
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318 _level = (unsigned short)NMT_minimal;
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319 }
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320
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321 inline NMT_TrackingLevel tracking_level() const {
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322 return (NMT_TrackingLevel)_level;
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323 }
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324
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325 inline size_t size() const { return _size; }
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326 inline MEMFLAGS flags() const { return (MEMFLAGS)_flags; }
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327 bool get_stack(NativeCallStack& stack) const;
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328
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329 // Cleanup tracking information before the memory is released.
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330 void release() const;
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331
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332 private:
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333 inline void set_size(size_t size) {
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334 assert(size <= MAX_MALLOC_SIZE, "Malloc size too large, should use virtual memory?");
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335 _size = size;
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336 }
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337 bool record_malloc_site(const NativeCallStack& stack, size_t size,
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338 size_t* bucket_idx, size_t* pos_idx) const;
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339 };
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340
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341
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342 // Main class called from MemTracker to track malloc activities
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343 class MallocTracker : AllStatic {
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344 public:
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345 // Initialize malloc tracker for specific tracking level
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346 static bool initialize(NMT_TrackingLevel level);
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347
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348 static bool transition(NMT_TrackingLevel from, NMT_TrackingLevel to);
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349
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350 // malloc tracking header size for specific tracking level
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351 static inline size_t malloc_header_size(NMT_TrackingLevel level) {
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352 return (level == NMT_off) ? 0 : sizeof(MallocHeader);
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353 }
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354
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355 // Parameter name convention:
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356 // memblock : the beginning address for user data
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357 // malloc_base: the beginning address that includes malloc tracking header
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358 //
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359 // The relationship:
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360 // memblock = (char*)malloc_base + sizeof(nmt header)
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361 //
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362
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363 // Record malloc on specified memory block
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364 static void* record_malloc(void* malloc_base, size_t size, MEMFLAGS flags,
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365 const NativeCallStack& stack, NMT_TrackingLevel level);
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366
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367 // Record free on specified memory block
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368 static void* record_free(void* memblock);
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369
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370 // Get tracking level of specified memory block
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371 static inline NMT_TrackingLevel get_memory_tracking_level(void* memblock);
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372
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373
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374 // Offset memory address to header address
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375 static inline void* get_base(void* memblock);
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376 static inline void* get_base(void* memblock, NMT_TrackingLevel level) {
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377 if (memblock == NULL || level == NMT_off) return memblock;
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378 return (char*)memblock - malloc_header_size(level);
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379 }
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380
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381 // Get memory size
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382 static inline size_t get_size(void* memblock) {
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383 MallocHeader* header = malloc_header(memblock);
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384 assert(header->tracking_level() >= NMT_summary,
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385 "Wrong tracking level");
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386 return header->size();
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387 }
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388
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389 // Get memory type
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390 static inline MEMFLAGS get_flags(void* memblock) {
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391 MallocHeader* header = malloc_header(memblock);
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392 assert(header->tracking_level() >= NMT_summary,
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393 "Wrong tracking level");
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394 return header->flags();
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395 }
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396
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397 // Get header size
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398 static inline size_t get_header_size(void* memblock) {
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399 return (memblock == NULL) ? 0 : sizeof(MallocHeader);
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400 }
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401
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402 static inline void record_new_arena(MEMFLAGS flags) {
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403 MallocMemorySummary::record_new_arena(flags);
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404 }
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405
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406 static inline void record_arena_free(MEMFLAGS flags) {
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407 MallocMemorySummary::record_arena_free(flags);
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408 }
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409
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410 static inline void record_arena_size_change(int size, MEMFLAGS flags) {
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411 MallocMemorySummary::record_arena_size_change(size, flags);
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412 }
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413 private:
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414 static inline MallocHeader* malloc_header(void *memblock) {
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415 assert(memblock != NULL, "NULL pointer");
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416 MallocHeader* header = (MallocHeader*)((char*)memblock - sizeof(MallocHeader));
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417 assert(header->tracking_level() >= NMT_minimal, "Bad header");
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418 return header;
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419 }
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420 };
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421
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422 #endif // INCLUDE_NMT
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423
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424
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425 #endif //SHARE_VM_SERVICES_MALLOC_TRACKER_HPP
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