Mercurial > hg > graal-compiler

annotate src/share/vm/gc_implementation/g1/g1AllocRegion.cpp @ 10100:9aa8d8037ee3

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Merge
author mgerdin
date Tue, 16 Apr 2013 12:46:24 +0200
parents 720b6a76dd9d
children 78bbf4d43a14
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1 /*
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2 * Copyright (c) 2011, 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 #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
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29 G1CollectedHeap* G1AllocRegion::_g1h = NULL;
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30 HeapRegion* G1AllocRegion::_dummy_region = NULL;
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31
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32 void G1AllocRegion::setup(G1CollectedHeap* g1h, HeapRegion* dummy_region) {
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33 assert(_dummy_region == NULL, "should be set once");
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34 assert(dummy_region != NULL, "pre-condition");
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35 assert(dummy_region->free() == 0, "pre-condition");
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36
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37 // Make sure that any allocation attempt on this region will fail
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38 // and will not trigger any asserts.
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39 assert(allocate(dummy_region, 1, false) == NULL, "should fail");
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40 assert(par_allocate(dummy_region, 1, false) == NULL, "should fail");
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41 assert(allocate(dummy_region, 1, true) == NULL, "should fail");
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42 assert(par_allocate(dummy_region, 1, true) == NULL, "should fail");
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43
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44 _g1h = g1h;
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45 _dummy_region = dummy_region;
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46 }
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47
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48 void G1AllocRegion::fill_up_remaining_space(HeapRegion* alloc_region,
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49 bool bot_updates) {
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50 assert(alloc_region != NULL && alloc_region != _dummy_region,
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51 "pre-condition");
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52
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53 // Other threads might still be trying to allocate using a CAS out
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54 // of the region we are trying to retire, as they can do so without
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55 // holding the lock. So, we first have to make sure that noone else
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56 // can allocate out of it by doing a maximal allocation. Even if our
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57 // CAS attempt fails a few times, we'll succeed sooner or later
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58 // given that failed CAS attempts mean that the region is getting
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59 // closed to being full.
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60 size_t free_word_size = alloc_region->free() / HeapWordSize;
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61
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62 // This is the minimum free chunk we can turn into a dummy
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63 // object. If the free space falls below this, then noone can
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64 // allocate in this region anyway (all allocation requests will be
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65 // of a size larger than this) so we won't have to perform the dummy
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66 // allocation.
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67 size_t min_word_size_to_fill = CollectedHeap::min_fill_size();
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68
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69 while (free_word_size >= min_word_size_to_fill) {
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70 HeapWord* dummy = par_allocate(alloc_region, free_word_size, bot_updates);
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71 if (dummy != NULL) {
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72 // If the allocation was successful we should fill in the space.
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73 CollectedHeap::fill_with_object(dummy, free_word_size);
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74 alloc_region->set_pre_dummy_top(dummy);
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75 break;
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76 }
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77
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78 free_word_size = alloc_region->free() / HeapWordSize;
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79 // It's also possible that someone else beats us to the
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80 // allocation and they fill up the region. In that case, we can
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81 // just get out of the loop.
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82 }
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83 assert(alloc_region->free() / HeapWordSize < min_word_size_to_fill,
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84 "post-condition");
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85 }
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86
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87 void G1AllocRegion::retire(bool fill_up) {
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88 assert(_alloc_region != NULL, ar_ext_msg(this, "not initialized properly"));
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89
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90 trace("retiring");
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91 HeapRegion* alloc_region = _alloc_region;
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92 if (alloc_region != _dummy_region) {
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93 // We never have to check whether the active region is empty or not,
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94 // and potentially free it if it is, given that it's guaranteed that
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95 // it will never be empty.
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96 assert(!alloc_region->is_empty(),
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97 ar_ext_msg(this, "the alloc region should never be empty"));
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98
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99 if (fill_up) {
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100 fill_up_remaining_space(alloc_region, _bot_updates);
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101 }
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102
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103 assert(alloc_region->used() >= _used_bytes_before,
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104 ar_ext_msg(this, "invariant"));
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105 size_t allocated_bytes = alloc_region->used() - _used_bytes_before;
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106 retire_region(alloc_region, allocated_bytes);
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107 _used_bytes_before = 0;
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108 _alloc_region = _dummy_region;
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109 }
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110 trace("retired");
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111 }
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112
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113 HeapWord* G1AllocRegion::new_alloc_region_and_allocate(size_t word_size,
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114 bool force) {
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115 assert(_alloc_region == _dummy_region, ar_ext_msg(this, "pre-condition"));
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116 assert(_used_bytes_before == 0, ar_ext_msg(this, "pre-condition"));
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117
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118 trace("attempting region allocation");
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119 HeapRegion* new_alloc_region = allocate_new_region(word_size, force);
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120 if (new_alloc_region != NULL) {
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121 new_alloc_region->reset_pre_dummy_top();
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122 // Need to do this before the allocation
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123 _used_bytes_before = new_alloc_region->used();
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124 HeapWord* result = allocate(new_alloc_region, word_size, _bot_updates);
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125 assert(result != NULL, ar_ext_msg(this, "the allocation should succeeded"));
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126
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127 OrderAccess::storestore();
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128 // Note that we first perform the allocation and then we store the
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129 // region in _alloc_region. This is the reason why an active region
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130 // can never be empty.
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131 _alloc_region = new_alloc_region;
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132 _count += 1;
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133 trace("region allocation successful");
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134 return result;
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135 } else {
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136 trace("region allocation failed");
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137 return NULL;
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138 }
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139 ShouldNotReachHere();
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140 }
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141
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142 void G1AllocRegion::fill_in_ext_msg(ar_ext_msg* msg, const char* message) {
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143 msg->append("[%s] %s c: %u b: %s r: "PTR_FORMAT" u: "SIZE_FORMAT,
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144 _name, message, _count, BOOL_TO_STR(_bot_updates),
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145 _alloc_region, _used_bytes_before);
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146 }
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147
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148 void G1AllocRegion::init() {
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149 trace("initializing");
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150 assert(_alloc_region == NULL && _used_bytes_before == 0,
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151 ar_ext_msg(this, "pre-condition"));
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152 assert(_dummy_region != NULL, ar_ext_msg(this, "should have been set"));
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153 _alloc_region = _dummy_region;
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154 _count = 0;
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155 trace("initialized");
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156 }
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157
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158 void G1AllocRegion::set(HeapRegion* alloc_region) {
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159 trace("setting");
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160 // We explicitly check that the region is not empty to make sure we
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161 // maintain the "the alloc region cannot be empty" invariant.
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162 assert(alloc_region != NULL && !alloc_region->is_empty(),
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163 ar_ext_msg(this, "pre-condition"));
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164 assert(_alloc_region == _dummy_region &&
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165 _used_bytes_before == 0 && _count == 0,
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166 ar_ext_msg(this, "pre-condition"));
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167
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168 _used_bytes_before = alloc_region->used();
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169 _alloc_region = alloc_region;
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170 _count += 1;
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171 trace("set");
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172 }
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173
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174 HeapRegion* G1AllocRegion::release() {
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175 trace("releasing");
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176 HeapRegion* alloc_region = _alloc_region;
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177 retire(false /* fill_up */);
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178 assert(_alloc_region == _dummy_region,
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179 ar_ext_msg(this, "post-condition of retire()"));
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180 _alloc_region = NULL;
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181 trace("released");
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182 return (alloc_region == _dummy_region) ? NULL : alloc_region;
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183 }
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184
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185 #if G1_ALLOC_REGION_TRACING
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186 void G1AllocRegion::trace(const char* str, size_t word_size, HeapWord* result) {
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187 // All the calls to trace that set either just the size or the size
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188 // and the result are considered part of level 2 tracing and are
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189 // skipped during level 1 tracing.
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190 if ((word_size == 0 && result == NULL) || (G1_ALLOC_REGION_TRACING > 1)) {
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191 const size_t buffer_length = 128;
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192 char hr_buffer[buffer_length];
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193 char rest_buffer[buffer_length];
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194
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195 HeapRegion* alloc_region = _alloc_region;
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196 if (alloc_region == NULL) {
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197 jio_snprintf(hr_buffer, buffer_length, "NULL");
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198 } else if (alloc_region == _dummy_region) {
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199 jio_snprintf(hr_buffer, buffer_length, "DUMMY");
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200 } else {
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201 jio_snprintf(hr_buffer, buffer_length,
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202 HR_FORMAT, HR_FORMAT_PARAMS(alloc_region));
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203 }
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204
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205 if (G1_ALLOC_REGION_TRACING > 1) {
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206 if (result != NULL) {
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207 jio_snprintf(rest_buffer, buffer_length, SIZE_FORMAT" "PTR_FORMAT,
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208 word_size, result);
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209 } else if (word_size != 0) {
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210 jio_snprintf(rest_buffer, buffer_length, SIZE_FORMAT, word_size);
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211 } else {
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212 jio_snprintf(rest_buffer, buffer_length, "");
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213 }
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214 } else {
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215 jio_snprintf(rest_buffer, buffer_length, "");
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216 }
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217
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218 tty->print_cr("[%s] %u %s : %s %s",
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219 _name, _count, hr_buffer, str, rest_buffer);
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220 }
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221 }
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222 #endif // G1_ALLOC_REGION_TRACING
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223
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224 G1AllocRegion::G1AllocRegion(const char* name,
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225 bool bot_updates)
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226 : _name(name), _bot_updates(bot_updates),
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227 _alloc_region(NULL), _count(0), _used_bytes_before(0) { }
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228