Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1AllocRegion.cpp @ 20388:7430aa5718a5
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author | amurillo |
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date | Wed, 03 Sep 2014 08:52:08 -0700 |
parents | ce8f6bb717c9 |
children | 227a9e5e4b4a |
rev | line source |
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1 /* |
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2 * Copyright (c) 2011, 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 #include "precompiled.hpp" |
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26 #include "gc_implementation/g1/g1AllocRegion.inline.hpp" |
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27 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
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28 #include "runtime/orderAccess.inline.hpp" |
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29 |
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30 G1CollectedHeap* G1AllocRegion::_g1h = NULL; |
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31 HeapRegion* G1AllocRegion::_dummy_region = NULL; |
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32 |
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33 void G1AllocRegion::setup(G1CollectedHeap* g1h, HeapRegion* dummy_region) { |
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34 assert(_dummy_region == NULL, "should be set once"); |
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35 assert(dummy_region != NULL, "pre-condition"); |
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36 assert(dummy_region->free() == 0, "pre-condition"); |
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37 |
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38 // Make sure that any allocation attempt on this region will fail |
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39 // and will not trigger any asserts. |
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40 assert(allocate(dummy_region, 1, false) == NULL, "should fail"); |
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41 assert(par_allocate(dummy_region, 1, false) == NULL, "should fail"); |
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42 assert(allocate(dummy_region, 1, true) == NULL, "should fail"); |
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43 assert(par_allocate(dummy_region, 1, true) == NULL, "should fail"); |
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44 |
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45 _g1h = g1h; |
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46 _dummy_region = dummy_region; |
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47 } |
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48 |
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49 void G1AllocRegion::fill_up_remaining_space(HeapRegion* alloc_region, |
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50 bool bot_updates) { |
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51 assert(alloc_region != NULL && alloc_region != _dummy_region, |
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52 "pre-condition"); |
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53 |
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54 // Other threads might still be trying to allocate using a CAS out |
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55 // of the region we are trying to retire, as they can do so without |
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56 // holding the lock. So, we first have to make sure that noone else |
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57 // can allocate out of it by doing a maximal allocation. Even if our |
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58 // CAS attempt fails a few times, we'll succeed sooner or later |
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59 // given that failed CAS attempts mean that the region is getting |
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60 // closed to being full. |
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61 size_t free_word_size = alloc_region->free() / HeapWordSize; |
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62 |
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63 // This is the minimum free chunk we can turn into a dummy |
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64 // object. If the free space falls below this, then noone can |
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65 // allocate in this region anyway (all allocation requests will be |
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66 // of a size larger than this) so we won't have to perform the dummy |
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67 // allocation. |
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68 size_t min_word_size_to_fill = CollectedHeap::min_fill_size(); |
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69 |
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70 while (free_word_size >= min_word_size_to_fill) { |
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71 HeapWord* dummy = par_allocate(alloc_region, free_word_size, bot_updates); |
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72 if (dummy != NULL) { |
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73 // If the allocation was successful we should fill in the space. |
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74 CollectedHeap::fill_with_object(dummy, free_word_size); |
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75 alloc_region->set_pre_dummy_top(dummy); |
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76 break; |
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77 } |
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78 |
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79 free_word_size = alloc_region->free() / HeapWordSize; |
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80 // It's also possible that someone else beats us to the |
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81 // allocation and they fill up the region. In that case, we can |
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82 // just get out of the loop. |
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83 } |
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84 assert(alloc_region->free() / HeapWordSize < min_word_size_to_fill, |
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85 "post-condition"); |
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86 } |
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87 |
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88 void G1AllocRegion::retire(bool fill_up) { |
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89 assert(_alloc_region != NULL, ar_ext_msg(this, "not initialized properly")); |
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90 |
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91 trace("retiring"); |
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92 HeapRegion* alloc_region = _alloc_region; |
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93 if (alloc_region != _dummy_region) { |
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94 // We never have to check whether the active region is empty or not, |
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95 // and potentially free it if it is, given that it's guaranteed that |
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96 // it will never be empty. |
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97 assert(!alloc_region->is_empty(), |
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98 ar_ext_msg(this, "the alloc region should never be empty")); |
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99 |
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100 if (fill_up) { |
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101 fill_up_remaining_space(alloc_region, _bot_updates); |
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102 } |
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103 |
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104 assert(alloc_region->used() >= _used_bytes_before, |
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105 ar_ext_msg(this, "invariant")); |
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106 size_t allocated_bytes = alloc_region->used() - _used_bytes_before; |
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107 retire_region(alloc_region, allocated_bytes); |
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108 _used_bytes_before = 0; |
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109 _alloc_region = _dummy_region; |
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110 } |
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111 trace("retired"); |
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112 } |
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113 |
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114 HeapWord* G1AllocRegion::new_alloc_region_and_allocate(size_t word_size, |
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115 bool force) { |
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116 assert(_alloc_region == _dummy_region, ar_ext_msg(this, "pre-condition")); |
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117 assert(_used_bytes_before == 0, ar_ext_msg(this, "pre-condition")); |
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118 |
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119 trace("attempting region allocation"); |
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120 HeapRegion* new_alloc_region = allocate_new_region(word_size, force); |
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121 if (new_alloc_region != NULL) { |
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122 new_alloc_region->reset_pre_dummy_top(); |
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123 // Need to do this before the allocation |
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124 _used_bytes_before = new_alloc_region->used(); |
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125 HeapWord* result = allocate(new_alloc_region, word_size, _bot_updates); |
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126 assert(result != NULL, ar_ext_msg(this, "the allocation should succeeded")); |
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127 |
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128 OrderAccess::storestore(); |
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129 // Note that we first perform the allocation and then we store the |
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130 // region in _alloc_region. This is the reason why an active region |
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131 // can never be empty. |
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132 _alloc_region = new_alloc_region; |
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133 _count += 1; |
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134 trace("region allocation successful"); |
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135 return result; |
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136 } else { |
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137 trace("region allocation failed"); |
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138 return NULL; |
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139 } |
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140 ShouldNotReachHere(); |
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141 } |
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142 |
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143 void G1AllocRegion::fill_in_ext_msg(ar_ext_msg* msg, const char* message) { |
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144 msg->append("[%s] %s c: %u b: %s r: "PTR_FORMAT" u: "SIZE_FORMAT, |
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145 _name, message, _count, BOOL_TO_STR(_bot_updates), |
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146 p2i(_alloc_region), _used_bytes_before); |
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147 } |
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148 |
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149 void G1AllocRegion::init() { |
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150 trace("initializing"); |
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151 assert(_alloc_region == NULL && _used_bytes_before == 0, |
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152 ar_ext_msg(this, "pre-condition")); |
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153 assert(_dummy_region != NULL, ar_ext_msg(this, "should have been set")); |
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154 _alloc_region = _dummy_region; |
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155 _count = 0; |
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156 trace("initialized"); |
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157 } |
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158 |
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159 void G1AllocRegion::set(HeapRegion* alloc_region) { |
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160 trace("setting"); |
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161 // We explicitly check that the region is not empty to make sure we |
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162 // maintain the "the alloc region cannot be empty" invariant. |
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163 assert(alloc_region != NULL && !alloc_region->is_empty(), |
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164 ar_ext_msg(this, "pre-condition")); |
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165 assert(_alloc_region == _dummy_region && |
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166 _used_bytes_before == 0 && _count == 0, |
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167 ar_ext_msg(this, "pre-condition")); |
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168 |
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169 _used_bytes_before = alloc_region->used(); |
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170 _alloc_region = alloc_region; |
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171 _count += 1; |
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172 trace("set"); |
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173 } |
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174 |
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175 HeapRegion* G1AllocRegion::release() { |
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176 trace("releasing"); |
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177 HeapRegion* alloc_region = _alloc_region; |
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178 retire(false /* fill_up */); |
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179 assert(_alloc_region == _dummy_region, |
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180 ar_ext_msg(this, "post-condition of retire()")); |
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181 _alloc_region = NULL; |
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182 trace("released"); |
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183 return (alloc_region == _dummy_region) ? NULL : alloc_region; |
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184 } |
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185 |
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186 #if G1_ALLOC_REGION_TRACING |
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187 void G1AllocRegion::trace(const char* str, size_t word_size, HeapWord* result) { |
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188 // All the calls to trace that set either just the size or the size |
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189 // and the result are considered part of level 2 tracing and are |
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190 // skipped during level 1 tracing. |
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191 if ((word_size == 0 && result == NULL) || (G1_ALLOC_REGION_TRACING > 1)) { |
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192 const size_t buffer_length = 128; |
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193 char hr_buffer[buffer_length]; |
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194 char rest_buffer[buffer_length]; |
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195 |
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196 HeapRegion* alloc_region = _alloc_region; |
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197 if (alloc_region == NULL) { |
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198 jio_snprintf(hr_buffer, buffer_length, "NULL"); |
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199 } else if (alloc_region == _dummy_region) { |
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200 jio_snprintf(hr_buffer, buffer_length, "DUMMY"); |
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201 } else { |
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202 jio_snprintf(hr_buffer, buffer_length, |
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203 HR_FORMAT, HR_FORMAT_PARAMS(alloc_region)); |
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204 } |
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205 |
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206 if (G1_ALLOC_REGION_TRACING > 1) { |
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207 if (result != NULL) { |
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208 jio_snprintf(rest_buffer, buffer_length, SIZE_FORMAT" "PTR_FORMAT, |
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209 word_size, result); |
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210 } else if (word_size != 0) { |
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211 jio_snprintf(rest_buffer, buffer_length, SIZE_FORMAT, word_size); |
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212 } else { |
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213 jio_snprintf(rest_buffer, buffer_length, ""); |
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214 } |
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215 } else { |
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216 jio_snprintf(rest_buffer, buffer_length, ""); |
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217 } |
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218 |
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219 tty->print_cr("[%s] %u %s : %s %s", |
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220 _name, _count, hr_buffer, str, rest_buffer); |
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221 } |
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222 } |
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223 #endif // G1_ALLOC_REGION_TRACING |
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224 |
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225 G1AllocRegion::G1AllocRegion(const char* name, |
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226 bool bot_updates) |
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227 : _name(name), _bot_updates(bot_updates), |
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228 _alloc_region(NULL), _count(0), _used_bytes_before(0) { } |
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229 |