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1 /* |
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2 * Copyright (c) 1999, 2012, 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_THREADLOCALALLOCBUFFER_HPP |
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26 #define SHARE_VM_MEMORY_THREADLOCALALLOCBUFFER_HPP |
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27 |
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28 #include "gc_implementation/shared/gcUtil.hpp" |
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29 #include "oops/typeArrayOop.hpp" |
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30 #include "runtime/perfData.hpp" |
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31 |
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32 class GlobalTLABStats; |
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33 |
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34 // ThreadLocalAllocBuffer: a descriptor for thread-local storage used by |
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35 // the threads for allocation. |
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36 // It is thread-private at any time, but maybe multiplexed over |
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37 // time across multiple threads. The park()/unpark() pair is |
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38 // used to make it available for such multiplexing. |
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39 class ThreadLocalAllocBuffer: public CHeapObj<mtThread> { |
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40 friend class VMStructs; |
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41 private: |
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42 HeapWord* _start; // address of TLAB |
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43 HeapWord* _top; // address after last allocation |
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44 HeapWord* _pf_top; // allocation prefetch watermark |
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45 HeapWord* _end; // allocation end (excluding alignment_reserve) |
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46 size_t _desired_size; // desired size (including alignment_reserve) |
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47 size_t _refill_waste_limit; // hold onto tlab if free() is larger than this |
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48 size_t _allocated_before_last_gc; // total bytes allocated up until the last gc |
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49 |
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50 static size_t _max_size; // maximum size of any TLAB |
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51 static unsigned _target_refills; // expected number of refills between GCs |
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52 |
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53 unsigned _number_of_refills; |
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54 unsigned _fast_refill_waste; |
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55 unsigned _slow_refill_waste; |
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56 unsigned _gc_waste; |
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57 unsigned _slow_allocations; |
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58 |
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59 AdaptiveWeightedAverage _allocation_fraction; // fraction of eden allocated in tlabs |
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60 |
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61 void accumulate_statistics(); |
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62 void initialize_statistics(); |
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63 |
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64 void set_start(HeapWord* start) { _start = start; } |
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65 void set_end(HeapWord* end) { _end = end; } |
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66 void set_top(HeapWord* top) { _top = top; } |
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67 void set_pf_top(HeapWord* pf_top) { _pf_top = pf_top; } |
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68 void set_desired_size(size_t desired_size) { _desired_size = desired_size; } |
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69 void set_refill_waste_limit(size_t waste) { _refill_waste_limit = waste; } |
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70 |
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71 size_t initial_refill_waste_limit() { return desired_size() / TLABRefillWasteFraction; } |
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72 |
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73 static int target_refills() { return _target_refills; } |
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74 size_t initial_desired_size(); |
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75 |
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76 size_t remaining() const { return end() == NULL ? 0 : pointer_delta(hard_end(), top()); } |
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77 |
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78 // Make parsable and release it. |
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79 void reset(); |
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80 |
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81 // Resize based on amount of allocation, etc. |
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82 void resize(); |
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83 |
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84 void invariants() const { assert(top() >= start() && top() <= end(), "invalid tlab"); } |
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85 |
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86 void initialize(HeapWord* start, HeapWord* top, HeapWord* end); |
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87 |
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88 void print_stats(const char* tag); |
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89 |
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90 Thread* myThread(); |
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91 |
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92 // statistics |
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93 |
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94 int number_of_refills() const { return _number_of_refills; } |
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95 int fast_refill_waste() const { return _fast_refill_waste; } |
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96 int slow_refill_waste() const { return _slow_refill_waste; } |
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97 int gc_waste() const { return _gc_waste; } |
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98 int slow_allocations() const { return _slow_allocations; } |
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99 |
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100 static GlobalTLABStats* _global_stats; |
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101 static GlobalTLABStats* global_stats() { return _global_stats; } |
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102 |
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103 public: |
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104 ThreadLocalAllocBuffer() : _allocation_fraction(TLABAllocationWeight), _allocated_before_last_gc(0) { |
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105 // do nothing. tlabs must be inited by initialize() calls |
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106 } |
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107 |
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108 static const size_t min_size() { return align_object_size(MinTLABSize / HeapWordSize); } |
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109 static const size_t max_size() { assert(_max_size != 0, "max_size not set up"); return _max_size; } |
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110 static void set_max_size(size_t max_size) { _max_size = max_size; } |
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111 |
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112 HeapWord* start() const { return _start; } |
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113 HeapWord* end() const { return _end; } |
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114 HeapWord* hard_end() const { return _end + alignment_reserve(); } |
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115 HeapWord* top() const { return _top; } |
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116 HeapWord* pf_top() const { return _pf_top; } |
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117 size_t desired_size() const { return _desired_size; } |
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118 size_t used() const { return pointer_delta(top(), start()); } |
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119 size_t used_bytes() const { return pointer_delta(top(), start(), 1); } |
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120 size_t free() const { return pointer_delta(end(), top()); } |
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121 // Don't discard tlab if remaining space is larger than this. |
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122 size_t refill_waste_limit() const { return _refill_waste_limit; } |
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123 |
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124 // Allocate size HeapWords. The memory is NOT initialized to zero. |
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125 inline HeapWord* allocate(size_t size); |
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126 |
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127 // Reserve space at the end of TLAB |
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128 static size_t end_reserve() { |
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129 int reserve_size = typeArrayOopDesc::header_size(T_INT); |
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130 return MAX2(reserve_size, VM_Version::reserve_for_allocation_prefetch()); |
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131 } |
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132 static size_t alignment_reserve() { return align_object_size(end_reserve()); } |
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133 static size_t alignment_reserve_in_bytes() { return alignment_reserve() * HeapWordSize; } |
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134 |
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135 // Return tlab size or remaining space in eden such that the |
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136 // space is large enough to hold obj_size and necessary fill space. |
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137 // Otherwise return 0; |
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138 inline size_t compute_size(size_t obj_size); |
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139 |
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140 // Record slow allocation |
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141 inline void record_slow_allocation(size_t obj_size); |
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142 |
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143 // Initialization at startup |
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144 static void startup_initialization(); |
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145 |
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146 // Make an in-use tlab parsable, optionally also retiring it. |
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147 void make_parsable(bool retire); |
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148 |
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149 // Retire in-use tlab before allocation of a new tlab |
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150 void clear_before_allocation(); |
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151 |
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152 // Accumulate statistics across all tlabs before gc |
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153 static void accumulate_statistics_before_gc(); |
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154 |
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155 // Resize tlabs for all threads |
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156 static void resize_all_tlabs(); |
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157 |
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158 void fill(HeapWord* start, HeapWord* top, size_t new_size); |
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159 void initialize(); |
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160 |
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161 static size_t refill_waste_limit_increment() { return TLABWasteIncrement; } |
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162 |
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163 // Code generation support |
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164 static ByteSize start_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _start); } |
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165 static ByteSize end_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _end ); } |
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166 static ByteSize top_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _top ); } |
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167 static ByteSize pf_top_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _pf_top ); } |
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168 static ByteSize size_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _desired_size ); } |
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169 static ByteSize refill_waste_limit_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _refill_waste_limit ); } |
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170 |
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171 static ByteSize number_of_refills_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _number_of_refills ); } |
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172 static ByteSize fast_refill_waste_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _fast_refill_waste ); } |
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173 static ByteSize slow_allocations_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _slow_allocations ); } |
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174 |
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175 void verify(); |
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176 }; |
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177 |
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178 class GlobalTLABStats: public CHeapObj<mtThread> { |
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179 private: |
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180 |
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181 // Accumulate perfdata in private variables because |
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182 // PerfData should be write-only for security reasons |
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183 // (see perfData.hpp) |
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184 unsigned _allocating_threads; |
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185 unsigned _total_refills; |
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186 unsigned _max_refills; |
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187 size_t _total_allocation; |
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188 size_t _total_gc_waste; |
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189 size_t _max_gc_waste; |
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190 size_t _total_slow_refill_waste; |
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191 size_t _max_slow_refill_waste; |
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192 size_t _total_fast_refill_waste; |
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193 size_t _max_fast_refill_waste; |
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194 unsigned _total_slow_allocations; |
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195 unsigned _max_slow_allocations; |
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196 |
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197 PerfVariable* _perf_allocating_threads; |
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198 PerfVariable* _perf_total_refills; |
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199 PerfVariable* _perf_max_refills; |
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200 PerfVariable* _perf_allocation; |
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201 PerfVariable* _perf_gc_waste; |
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202 PerfVariable* _perf_max_gc_waste; |
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203 PerfVariable* _perf_slow_refill_waste; |
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204 PerfVariable* _perf_max_slow_refill_waste; |
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205 PerfVariable* _perf_fast_refill_waste; |
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206 PerfVariable* _perf_max_fast_refill_waste; |
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207 PerfVariable* _perf_slow_allocations; |
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208 PerfVariable* _perf_max_slow_allocations; |
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209 |
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210 AdaptiveWeightedAverage _allocating_threads_avg; |
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211 |
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212 public: |
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213 GlobalTLABStats(); |
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214 |
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215 // Initialize all counters |
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216 void initialize(); |
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217 |
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218 // Write all perf counters to the perf_counters |
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219 void publish(); |
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220 |
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221 void print(); |
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222 |
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223 // Accessors |
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224 unsigned allocating_threads_avg() { |
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225 return MAX2((unsigned)(_allocating_threads_avg.average() + 0.5), 1U); |
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226 } |
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227 |
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228 size_t allocation() { |
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229 return _total_allocation; |
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230 } |
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231 |
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232 // Update methods |
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233 |
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234 void update_allocating_threads() { |
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235 _allocating_threads++; |
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236 } |
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237 void update_number_of_refills(unsigned value) { |
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238 _total_refills += value; |
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239 _max_refills = MAX2(_max_refills, value); |
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240 } |
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241 void update_allocation(size_t value) { |
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242 _total_allocation += value; |
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243 } |
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244 void update_gc_waste(size_t value) { |
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245 _total_gc_waste += value; |
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246 _max_gc_waste = MAX2(_max_gc_waste, value); |
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247 } |
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248 void update_fast_refill_waste(size_t value) { |
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249 _total_fast_refill_waste += value; |
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250 _max_fast_refill_waste = MAX2(_max_fast_refill_waste, value); |
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251 } |
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252 void update_slow_refill_waste(size_t value) { |
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253 _total_slow_refill_waste += value; |
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254 _max_slow_refill_waste = MAX2(_max_slow_refill_waste, value); |
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255 } |
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256 void update_slow_allocations(unsigned value) { |
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257 _total_slow_allocations += value; |
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258 _max_slow_allocations = MAX2(_max_slow_allocations, value); |
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259 } |
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260 }; |
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261 |
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262 #endif // SHARE_VM_MEMORY_THREADLOCALALLOCBUFFER_HPP |