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annotate src/share/vm/gc_implementation/g1/g1OopClosures.inline.hpp @ 20382:b1266b08b994

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8056043: Heap does not shrink within the heap after JDK-8038423 Summary: Enable shrinking within the heap by removing some code added for JDK-8054818. Enable the test case that checks that again too. Reviewed-by: jwilhelm, jmasa
author tschatzl
date Wed, 03 Sep 2014 09:24:07 +0200
parents eec72fa4b108
children 7848fc12602b
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rev   line source
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1 /*
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2 * Copyright (c) 2001, 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_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_INLINE_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_INLINE_HPP
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27
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28 #include "gc_implementation/g1/concurrentMark.inline.hpp"
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29 #include "gc_implementation/g1/g1CollectedHeap.hpp"
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30 #include "gc_implementation/g1/g1OopClosures.hpp"
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31 #include "gc_implementation/g1/g1ParScanThreadState.inline.hpp"
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32 #include "gc_implementation/g1/g1RemSet.hpp"
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33 #include "gc_implementation/g1/g1RemSet.inline.hpp"
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34 #include "gc_implementation/g1/heapRegionRemSet.hpp"
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35 #include "memory/iterator.inline.hpp"
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36 #include "runtime/prefetch.inline.hpp"
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37
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38 /*
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39 * This really ought to be an inline function, but apparently the C++
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40 * compiler sometimes sees fit to ignore inline declarations. Sigh.
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41 */
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42
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43 template <class T>
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44 inline void FilterIntoCSClosure::do_oop_nv(T* p) {
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45 T heap_oop = oopDesc::load_heap_oop(p);
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46 if (!oopDesc::is_null(heap_oop) &&
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47 _g1->is_in_cset_or_humongous(oopDesc::decode_heap_oop_not_null(heap_oop))) {
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48 _oc->do_oop(p);
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49 }
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50 }
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51
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52 template <class T>
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53 inline void FilterOutOfRegionClosure::do_oop_nv(T* p) {
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54 T heap_oop = oopDesc::load_heap_oop(p);
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55 if (!oopDesc::is_null(heap_oop)) {
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56 HeapWord* obj_hw = (HeapWord*)oopDesc::decode_heap_oop_not_null(heap_oop);
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57 if (obj_hw < _r_bottom || obj_hw >= _r_end) {
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58 _oc->do_oop(p);
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59 }
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60 }
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61 }
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62
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63 // This closure is applied to the fields of the objects that have just been copied.
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64 template <class T>
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65 inline void G1ParScanClosure::do_oop_nv(T* p) {
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66 T heap_oop = oopDesc::load_heap_oop(p);
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67
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68 if (!oopDesc::is_null(heap_oop)) {
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69 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
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70 G1CollectedHeap::in_cset_state_t state = _g1->in_cset_state(obj);
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71 if (state == G1CollectedHeap::InCSet) {
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72 // We're not going to even bother checking whether the object is
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73 // already forwarded or not, as this usually causes an immediate
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74 // stall. We'll try to prefetch the object (for write, given that
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75 // we might need to install the forwarding reference) and we'll
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76 // get back to it when pop it from the queue
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77 Prefetch::write(obj->mark_addr(), 0);
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78 Prefetch::read(obj->mark_addr(), (HeapWordSize*2));
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79
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80 // slightly paranoid test; I'm trying to catch potential
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81 // problems before we go into push_on_queue to know where the
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82 // problem is coming from
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83 assert((obj == oopDesc::load_decode_heap_oop(p)) ||
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84 (obj->is_forwarded() &&
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85 obj->forwardee() == oopDesc::load_decode_heap_oop(p)),
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86 "p should still be pointing to obj or to its forwardee");
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87
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88 _par_scan_state->push_on_queue(p);
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89 } else {
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90 if (state == G1CollectedHeap::IsHumongous) {
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91 _g1->set_humongous_is_live(obj);
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92 }
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93 _par_scan_state->update_rs(_from, p, _worker_id);
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94 }
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95 }
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96 }
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97
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98 template <class T>
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99 inline void G1ParPushHeapRSClosure::do_oop_nv(T* p) {
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100 T heap_oop = oopDesc::load_heap_oop(p);
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101
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102 if (!oopDesc::is_null(heap_oop)) {
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103 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
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104 if (_g1->is_in_cset_or_humongous(obj)) {
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105 Prefetch::write(obj->mark_addr(), 0);
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106 Prefetch::read(obj->mark_addr(), (HeapWordSize*2));
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107
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108 // Place on the references queue
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109 _par_scan_state->push_on_queue(p);
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110 } else {
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111 assert(!_g1->obj_in_cs(obj), "checking");
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112 }
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113 }
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114 }
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115
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116 template <class T>
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117 inline void G1CMOopClosure::do_oop_nv(T* p) {
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118 oop obj = oopDesc::load_decode_heap_oop(p);
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119 if (_cm->verbose_high()) {
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120 gclog_or_tty->print_cr("[%u] we're looking at location "
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121 "*"PTR_FORMAT" = "PTR_FORMAT,
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122 _task->worker_id(), p2i(p), p2i((void*) obj));
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123 }
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124 _task->deal_with_reference(obj);
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125 }
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126
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127 template <class T>
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128 inline void G1RootRegionScanClosure::do_oop_nv(T* p) {
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129 T heap_oop = oopDesc::load_heap_oop(p);
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130 if (!oopDesc::is_null(heap_oop)) {
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131 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
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132 HeapRegion* hr = _g1h->heap_region_containing((HeapWord*) obj);
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133 _cm->grayRoot(obj, obj->size(), _worker_id, hr);
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134 }
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135 }
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136
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137 template <class T>
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138 inline void G1Mux2Closure::do_oop_nv(T* p) {
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139 // Apply first closure; then apply the second.
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140 _c1->do_oop(p);
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141 _c2->do_oop(p);
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142 }
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143
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144 template <class T>
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145 inline void G1TriggerClosure::do_oop_nv(T* p) {
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146 // Record that this closure was actually applied (triggered).
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147 _triggered = true;
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148 }
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149
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150 template <class T>
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151 inline void G1InvokeIfNotTriggeredClosure::do_oop_nv(T* p) {
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152 if (!_trigger_cl->triggered()) {
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153 _oop_cl->do_oop(p);
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154 }
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155 }
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156
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157 template <class T>
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158 inline void G1UpdateRSOrPushRefOopClosure::do_oop_nv(T* p) {
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159 oop obj = oopDesc::load_decode_heap_oop(p);
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160 if (obj == NULL) {
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161 return;
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162 }
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163 #ifdef ASSERT
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164 // can't do because of races
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165 // assert(obj == NULL || obj->is_oop(), "expected an oop");
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166
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167 // Do the safe subset of is_oop
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168 #ifdef CHECK_UNHANDLED_OOPS
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169 oopDesc* o = obj.obj();
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170 #else
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171 oopDesc* o = obj;
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172 #endif // CHECK_UNHANDLED_OOPS
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173 assert((intptr_t)o % MinObjAlignmentInBytes == 0, "not oop aligned");
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174 assert(Universe::heap()->is_in_reserved(obj), "must be in heap");
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175 #endif // ASSERT
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176
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177 assert(_from != NULL, "from region must be non-NULL");
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178 assert(_from->is_in_reserved(p), "p is not in from");
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179
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180 HeapRegion* to = _g1->heap_region_containing(obj);
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181 if (_from == to) {
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182 // Normally this closure should only be called with cross-region references.
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183 // But since Java threads are manipulating the references concurrently and we
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184 // reload the values things may have changed.
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185 return;
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186 }
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187 // The _record_refs_into_cset flag is true during the RSet
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188 // updating part of an evacuation pause. It is false at all
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189 // other times:
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190 // * rebuilding the remembered sets after a full GC
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191 // * during concurrent refinement.
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192 // * updating the remembered sets of regions in the collection
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193 // set in the event of an evacuation failure (when deferred
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194 // updates are enabled).
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195
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196 if (_record_refs_into_cset && to->in_collection_set()) {
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197 // We are recording references that point into the collection
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198 // set and this particular reference does exactly that...
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199 // If the referenced object has already been forwarded
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200 // to itself, we are handling an evacuation failure and
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201 // we have already visited/tried to copy this object
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202 // there is no need to retry.
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203 if (!self_forwarded(obj)) {
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204 assert(_push_ref_cl != NULL, "should not be null");
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205 // Push the reference in the refs queue of the G1ParScanThreadState
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206 // instance for this worker thread.
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207 _push_ref_cl->do_oop(p);
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208 }
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209
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210 // Deferred updates to the CSet are either discarded (in the normal case),
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211 // or processed (if an evacuation failure occurs) at the end
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212 // of the collection.
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213 // See G1RemSet::cleanup_after_oops_into_collection_set_do().
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214 } else {
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215 // We either don't care about pushing references that point into the
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216 // collection set (i.e. we're not during an evacuation pause) _or_
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217 // the reference doesn't point into the collection set. Either way
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218 // we add the reference directly to the RSet of the region containing
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219 // the referenced object.
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220 assert(to->rem_set() != NULL, "Need per-region 'into' remsets.");
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221 to->rem_set()->add_reference(p, _worker_i);
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222 }
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223 }
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224
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225 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_INLINE_HPP