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annotate src/share/vm/gc_implementation/g1/g1HRPrinter.hpp @ 4912:a9647476d1a4

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7132029: G1: mixed GC phase lasts for longer than it should Summary: Revamp of the mechanism that chooses old regions for inclusion in the CSet. It simplifies the code and introduces min and max bounds on the number of old regions added to the CSet at each mixed GC to avoid pathological cases. It also ensures that when we do a mixed GC we'll always find old regions to add to the CSet (i.e., it eliminates the case where a mixed GC will collect no old regions which can happen today). Reviewed-by: johnc, brutisso
author tonyp
date Wed, 15 Feb 2012 13:06:53 -0500
parents 5f6f2615433a
children
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1 /*
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2 * Copyright (c) 2011, 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_GC_IMPLEMENTATION_G1_G1HRPRINTER_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1HRPRINTER_HPP
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27
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28 #include "memory/allocation.hpp"
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29 #include "gc_implementation/g1/heapRegion.hpp"
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30
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31 #define SKIP_RETIRED_FULL_REGIONS 1
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32
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33 class G1HRPrinter VALUE_OBJ_CLASS_SPEC {
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34 public:
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35 typedef enum {
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36 Alloc,
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37 AllocForce,
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38 Retire,
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39 Reuse,
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40 CSet,
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41 EvacFailure,
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42 Cleanup,
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43 PostCompaction,
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44 Commit,
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45 Uncommit
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46 } ActionType;
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47
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48 typedef enum {
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49 Unset,
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50 Eden,
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51 Survivor,
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52 Old,
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53 SingleHumongous,
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54 StartsHumongous,
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55 ContinuesHumongous
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56 } RegionType;
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57
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58 typedef enum {
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59 StartGC,
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60 EndGC,
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61 StartFullGC,
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62 EndFullGC
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63 } PhaseType;
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64
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65 private:
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66 bool _active;
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67
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68 static const char* action_name(ActionType action);
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69 static const char* region_type_name(RegionType type);
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70 static const char* phase_name(PhaseType phase);
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71
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72 // Print an action event. This version is used in most scenarios and
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73 // only prints the region's bottom. The parameters type and top are
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74 // optional (the "not set" values are Unset and NULL).
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75 static void print(ActionType action, RegionType type,
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76 HeapRegion* hr, HeapWord* top);
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77
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78 // Print an action event. This version prints both the region's
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79 // bottom and end. Used for Commit / Uncommit events.
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80 static void print(ActionType action, HeapWord* bottom, HeapWord* end);
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81
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82 // Print a phase event.
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83 static void print(PhaseType phase, size_t phase_num);
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84
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85 public:
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86 // In some places we iterate over a list in order to generate output
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87 // for the list's elements. By exposing this we can avoid this
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88 // iteration if the printer is not active.
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89 const bool is_active() { return _active; }
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90
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91 // Have to set this explicitly as we have to do this during the
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92 // heap's initialize() method, not in the constructor.
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93 void set_active(bool active) { _active = active; }
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94
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95 // The methods below are convenient wrappers for the print() methods.
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96
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97 void alloc(HeapRegion* hr, RegionType type, bool force = false) {
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98 if (is_active()) {
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99 print((!force) ? Alloc : AllocForce, type, hr, NULL);
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100 }
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101 }
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102
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103 void alloc(RegionType type, HeapRegion* hr, HeapWord* top) {
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104 if (is_active()) {
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105 print(Alloc, type, hr, top);
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106 }
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107 }
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108
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109 void retire(HeapRegion* hr) {
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110 if (is_active()) {
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111 if (!SKIP_RETIRED_FULL_REGIONS || hr->top() < hr->end()) {
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112 print(Retire, Unset, hr, hr->top());
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113 }
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114 }
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115 }
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116
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117 void reuse(HeapRegion* hr) {
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118 if (is_active()) {
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119 print(Reuse, Unset, hr, NULL);
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120 }
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121 }
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122
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123 void cset(HeapRegion* hr) {
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124 if (is_active()) {
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125 print(CSet, Unset, hr, NULL);
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126 }
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127 }
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128
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129 void evac_failure(HeapRegion* hr) {
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130 if (is_active()) {
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131 print(EvacFailure, Unset, hr, NULL);
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132 }
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133 }
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134
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135 void cleanup(HeapRegion* hr) {
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136 if (is_active()) {
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137 print(Cleanup, Unset, hr, NULL);
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138 }
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139 }
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140
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141 void post_compaction(HeapRegion* hr, RegionType type) {
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142 if (is_active()) {
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143 print(PostCompaction, type, hr, hr->top());
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144 }
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145 }
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146
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147 void commit(HeapWord* bottom, HeapWord* end) {
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148 if (is_active()) {
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149 print(Commit, bottom, end);
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150 }
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151 }
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152
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153 void uncommit(HeapWord* bottom, HeapWord* end) {
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154 if (is_active()) {
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155 print(Uncommit, bottom, end);
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156 }
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157 }
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158
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159 void start_gc(bool full, size_t gc_num) {
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160 if (is_active()) {
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161 if (!full) {
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162 print(StartGC, gc_num);
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163 } else {
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164 print(StartFullGC, gc_num);
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165 }
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166 }
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167 }
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168
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169 void end_gc(bool full, size_t gc_num) {
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170 if (is_active()) {
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171 if (!full) {
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172 print(EndGC, gc_num);
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173 } else {
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174 print(EndFullGC, gc_num);
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175 }
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176 }
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177 }
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178
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179 G1HRPrinter() : _active(false) { }
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180 };
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181
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182 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1HRPRINTER_HPP