Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.inline.hpp @ 20331:18bf0b66de52
8044406: JVM crash with JDK8 (build 1.8.0-b132) with G1 GC
Summary: Fill the last card that has been allocated into with a dummy object
Reviewed-by: tschatzl, mgerdin
author | poonam |
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date | Tue, 19 Aug 2014 02:05:49 -0700 |
parents | a3953c777565 |
children | eec72fa4b108 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
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. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_INLINE_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_INLINE_HPP | |
27 | |
28 #include "gc_implementation/g1/concurrentMark.hpp" | |
29 #include "gc_implementation/g1/g1CollectedHeap.hpp" | |
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30 #include "gc_implementation/g1/g1AllocRegion.inline.hpp" |
1973 | 31 #include "gc_implementation/g1/g1CollectorPolicy.hpp" |
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32 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp" |
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33 #include "gc_implementation/g1/heapRegionSet.inline.hpp" |
2149 | 34 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" |
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35 #include "runtime/orderAccess.inline.hpp" |
1972 | 36 #include "utilities/taskqueue.hpp" |
37 | |
342 | 38 // Inline functions for G1CollectedHeap |
39 | |
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40 // Return the region with the given index. It assumes the index is valid. |
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41 inline HeapRegion* G1CollectedHeap::region_at(uint index) const { return _hrs.at(index); } |
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42 |
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43 inline uint G1CollectedHeap::addr_to_region(HeapWord* addr) const { |
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44 assert(is_in_reserved(addr), |
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45 err_msg("Cannot calculate region index for address "PTR_FORMAT" that is outside of the heap ["PTR_FORMAT", "PTR_FORMAT")", |
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46 p2i(addr), p2i(_reserved.start()), p2i(_reserved.end()))); |
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47 return (uint)(pointer_delta(addr, _reserved.start(), sizeof(uint8_t)) >> HeapRegion::LogOfHRGrainBytes); |
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48 } |
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49 |
3766 | 50 template <class T> |
342 | 51 inline HeapRegion* |
3766 | 52 G1CollectedHeap::heap_region_containing(const T addr) const { |
53 HeapRegion* hr = _hrs.addr_to_region((HeapWord*) addr); | |
342 | 54 // hr can be null if addr in perm_gen |
55 if (hr != NULL && hr->continuesHumongous()) { | |
56 hr = hr->humongous_start_region(); | |
57 } | |
58 return hr; | |
59 } | |
60 | |
3766 | 61 template <class T> |
342 | 62 inline HeapRegion* |
3766 | 63 G1CollectedHeap::heap_region_containing_raw(const T addr) const { |
64 assert(_g1_reserved.contains((const void*) addr), "invariant"); | |
65 HeapRegion* res = _hrs.addr_to_region_unsafe((HeapWord*) addr); | |
342 | 66 return res; |
67 } | |
68 | |
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69 inline void G1CollectedHeap::reset_gc_time_stamp() { |
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70 _gc_time_stamp = 0; |
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71 OrderAccess::fence(); |
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72 // Clear the cached CSet starting regions and time stamps. |
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73 // Their validity is dependent on the GC timestamp. |
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74 clear_cset_start_regions(); |
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75 } |
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76 |
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77 inline void G1CollectedHeap::increment_gc_time_stamp() { |
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78 ++_gc_time_stamp; |
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79 OrderAccess::fence(); |
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80 } |
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81 |
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82 inline void G1CollectedHeap::old_set_remove(HeapRegion* hr) { |
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83 _old_set.remove(hr); |
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84 } |
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85 |
342 | 86 inline bool G1CollectedHeap::obj_in_cs(oop obj) { |
3766 | 87 HeapRegion* r = _hrs.addr_to_region((HeapWord*) obj); |
342 | 88 return r != NULL && r->in_collection_set(); |
89 } | |
90 | |
1973 | 91 inline HeapWord* |
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92 G1CollectedHeap::attempt_allocation(size_t word_size, |
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93 unsigned int* gc_count_before_ret, |
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94 int* gclocker_retry_count_ret) { |
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95 assert_heap_not_locked_and_not_at_safepoint(); |
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96 assert(!isHumongous(word_size), "attempt_allocation() should not " |
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97 "be called for humongous allocation requests"); |
1973 | 98 |
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99 HeapWord* result = _mutator_alloc_region.attempt_allocation(word_size, |
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100 false /* bot_updates */); |
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101 if (result == NULL) { |
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102 result = attempt_allocation_slow(word_size, |
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103 gc_count_before_ret, |
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104 gclocker_retry_count_ret); |
342 | 105 } |
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106 assert_heap_not_locked(); |
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107 if (result != NULL) { |
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108 dirty_young_block(result, word_size); |
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109 } |
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110 return result; |
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111 } |
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112 |
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113 inline HeapWord* G1CollectedHeap::survivor_attempt_allocation(size_t |
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114 word_size) { |
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115 assert(!isHumongous(word_size), |
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116 "we should not be seeing humongous-size allocations in this path"); |
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117 |
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118 HeapWord* result = _survivor_gc_alloc_region.attempt_allocation(word_size, |
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119 false /* bot_updates */); |
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120 if (result == NULL) { |
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121 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); |
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122 result = _survivor_gc_alloc_region.attempt_allocation_locked(word_size, |
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123 false /* bot_updates */); |
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124 } |
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125 if (result != NULL) { |
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126 dirty_young_block(result, word_size); |
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127 } |
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128 return result; |
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129 } |
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130 |
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131 inline HeapWord* G1CollectedHeap::old_attempt_allocation(size_t word_size) { |
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132 assert(!isHumongous(word_size), |
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133 "we should not be seeing humongous-size allocations in this path"); |
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134 |
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135 HeapWord* result = _old_gc_alloc_region.attempt_allocation(word_size, |
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136 true /* bot_updates */); |
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137 if (result == NULL) { |
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138 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); |
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139 result = _old_gc_alloc_region.attempt_allocation_locked(word_size, |
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140 true /* bot_updates */); |
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141 } |
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142 return result; |
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143 } |
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144 |
1973 | 145 // It dirties the cards that cover the block so that so that the post |
146 // write barrier never queues anything when updating objects on this | |
147 // block. It is assumed (and in fact we assert) that the block | |
148 // belongs to a young region. | |
149 inline void | |
150 G1CollectedHeap::dirty_young_block(HeapWord* start, size_t word_size) { | |
151 assert_heap_not_locked(); | |
152 | |
153 // Assign the containing region to containing_hr so that we don't | |
154 // have to keep calling heap_region_containing_raw() in the | |
155 // asserts below. | |
156 DEBUG_ONLY(HeapRegion* containing_hr = heap_region_containing_raw(start);) | |
157 assert(containing_hr != NULL && start != NULL && word_size > 0, | |
158 "pre-condition"); | |
159 assert(containing_hr->is_in(start), "it should contain start"); | |
160 assert(containing_hr->is_young(), "it should be young"); | |
161 assert(!containing_hr->isHumongous(), "it should not be humongous"); | |
162 | |
163 HeapWord* end = start + word_size; | |
164 assert(containing_hr->is_in(end - 1), "it should also contain end - 1"); | |
165 | |
166 MemRegion mr(start, end); | |
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167 g1_barrier_set()->g1_mark_as_young(mr); |
342 | 168 } |
169 | |
1709 | 170 inline RefToScanQueue* G1CollectedHeap::task_queue(int i) const { |
342 | 171 return _task_queues->queue(i); |
172 } | |
173 | |
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174 inline bool G1CollectedHeap::isMarkedPrev(oop obj) const { |
342 | 175 return _cm->prevMarkBitMap()->isMarked((HeapWord *)obj); |
176 } | |
177 | |
178 inline bool G1CollectedHeap::isMarkedNext(oop obj) const { | |
179 return _cm->nextMarkBitMap()->isMarked((HeapWord *)obj); | |
180 } | |
1972 | 181 |
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182 // This is a fast test on whether a reference points into the |
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183 // collection set or not. Assume that the reference |
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184 // points into the heap. |
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185 inline bool G1CollectedHeap::is_in_cset(oop obj) { |
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186 bool ret = _in_cset_fast_test.is_in_cset((HeapWord*)obj); |
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187 // let's make sure the result is consistent with what the slower |
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188 // test returns |
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189 assert( ret || !obj_in_cs(obj), "sanity"); |
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190 assert(!ret || obj_in_cs(obj), "sanity"); |
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191 return ret; |
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192 } |
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193 |
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194 bool G1CollectedHeap::is_in_cset_or_humongous(const oop obj) { |
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195 return _in_cset_fast_test.is_in_cset_or_humongous((HeapWord*)obj); |
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196 } |
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197 |
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198 G1CollectedHeap::in_cset_state_t G1CollectedHeap::in_cset_state(const oop obj) { |
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199 return _in_cset_fast_test.at((HeapWord*)obj); |
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200 } |
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201 |
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202 void G1CollectedHeap::register_humongous_region_with_in_cset_fast_test(uint index) { |
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203 _in_cset_fast_test.set_humongous(index); |
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204 } |
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205 |
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206 #ifndef PRODUCT |
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207 // Support for G1EvacuationFailureALot |
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208 |
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209 inline bool |
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210 G1CollectedHeap::evacuation_failure_alot_for_gc_type(bool gcs_are_young, |
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211 bool during_initial_mark, |
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212 bool during_marking) { |
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213 bool res = false; |
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214 if (during_marking) { |
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215 res |= G1EvacuationFailureALotDuringConcMark; |
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216 } |
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217 if (during_initial_mark) { |
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218 res |= G1EvacuationFailureALotDuringInitialMark; |
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219 } |
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220 if (gcs_are_young) { |
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221 res |= G1EvacuationFailureALotDuringYoungGC; |
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222 } else { |
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223 // GCs are mixed |
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224 res |= G1EvacuationFailureALotDuringMixedGC; |
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225 } |
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226 return res; |
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227 } |
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228 |
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229 inline void |
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230 G1CollectedHeap::set_evacuation_failure_alot_for_current_gc() { |
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231 if (G1EvacuationFailureALot) { |
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232 // Note we can't assert that _evacuation_failure_alot_for_current_gc |
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233 // is clear here. It may have been set during a previous GC but that GC |
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234 // did not copy enough objects (i.e. G1EvacuationFailureALotCount) to |
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235 // trigger an evacuation failure and clear the flags and and counts. |
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236 |
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237 // Check if we have gone over the interval. |
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238 const size_t gc_num = total_collections(); |
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239 const size_t elapsed_gcs = gc_num - _evacuation_failure_alot_gc_number; |
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240 |
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241 _evacuation_failure_alot_for_current_gc = (elapsed_gcs >= G1EvacuationFailureALotInterval); |
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242 |
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243 // Now check if G1EvacuationFailureALot is enabled for the current GC type. |
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244 const bool gcs_are_young = g1_policy()->gcs_are_young(); |
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245 const bool during_im = g1_policy()->during_initial_mark_pause(); |
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246 const bool during_marking = mark_in_progress(); |
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247 |
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248 _evacuation_failure_alot_for_current_gc &= |
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249 evacuation_failure_alot_for_gc_type(gcs_are_young, |
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250 during_im, |
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251 during_marking); |
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252 } |
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253 } |
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254 |
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255 inline bool |
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256 G1CollectedHeap::evacuation_should_fail() { |
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257 if (!G1EvacuationFailureALot || !_evacuation_failure_alot_for_current_gc) { |
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258 return false; |
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259 } |
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260 // G1EvacuationFailureALot is in effect for current GC |
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261 // Access to _evacuation_failure_alot_count is not atomic; |
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262 // the value does not have to be exact. |
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263 if (++_evacuation_failure_alot_count < G1EvacuationFailureALotCount) { |
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264 return false; |
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265 } |
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266 _evacuation_failure_alot_count = 0; |
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267 return true; |
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268 } |
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269 |
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270 inline void G1CollectedHeap::reset_evacuation_should_fail() { |
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271 if (G1EvacuationFailureALot) { |
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272 _evacuation_failure_alot_gc_number = total_collections(); |
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273 _evacuation_failure_alot_count = 0; |
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274 _evacuation_failure_alot_for_current_gc = false; |
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275 } |
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276 } |
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277 #endif // #ifndef PRODUCT |
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278 |
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279 inline bool G1CollectedHeap::is_in_young(const oop obj) { |
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280 HeapRegion* hr = heap_region_containing(obj); |
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281 return hr != NULL && hr->is_young(); |
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282 } |
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283 |
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284 // We don't need barriers for initializing stores to objects |
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285 // in the young gen: for the SATB pre-barrier, there is no |
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286 // pre-value that needs to be remembered; for the remembered-set |
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287 // update logging post-barrier, we don't maintain remembered set |
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288 // information for young gen objects. |
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289 inline bool G1CollectedHeap::can_elide_initializing_store_barrier(oop new_obj) { |
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290 return is_in_young(new_obj); |
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291 } |
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292 |
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293 inline bool G1CollectedHeap::is_obj_dead(const oop obj) const { |
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294 const HeapRegion* hr = heap_region_containing(obj); |
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295 if (hr == NULL) { |
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296 if (obj == NULL) return false; |
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297 else return true; |
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298 } |
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299 else return is_obj_dead(obj, hr); |
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300 } |
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301 |
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302 inline bool G1CollectedHeap::is_obj_ill(const oop obj) const { |
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303 const HeapRegion* hr = heap_region_containing(obj); |
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304 if (hr == NULL) { |
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305 if (obj == NULL) return false; |
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306 else return true; |
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307 } |
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308 else return is_obj_ill(obj, hr); |
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309 } |
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310 |
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311 inline void G1CollectedHeap::set_humongous_is_live(oop obj) { |
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312 uint region = addr_to_region((HeapWord*)obj); |
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313 // We not only set the "live" flag in the humongous_is_live table, but also |
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314 // reset the entry in the _in_cset_fast_test table so that subsequent references |
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315 // to the same humongous object do not go into the slow path again. |
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316 // This is racy, as multiple threads may at the same time enter here, but this |
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317 // is benign. |
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318 // During collection we only ever set the "live" flag, and only ever clear the |
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319 // entry in the in_cset_fast_table. |
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320 // We only ever evaluate the contents of these tables (in the VM thread) after |
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321 // having synchronized the worker threads with the VM thread, or in the same |
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322 // thread (i.e. within the VM thread). |
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323 if (!_humongous_is_live.is_live(region)) { |
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324 _humongous_is_live.set_live(region); |
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325 _in_cset_fast_test.clear_humongous(region); |
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326 } |
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327 } |
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328 |
1972 | 329 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_INLINE_HPP |