1 /* 2 * Copyright (c) 2001, 2018, Oracle and/or its affiliates. All rights reserved. 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 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_GC_G1_G1COLLECTEDHEAP_INLINE_HPP 26 #define SHARE_VM_GC_G1_G1COLLECTEDHEAP_INLINE_HPP 27 28 #include "gc/g1/g1BarrierSet.hpp" 29 #include "gc/g1/g1CollectedHeap.hpp" 30 #include "gc/g1/g1CollectorState.hpp" 31 #include "gc/g1/g1ConcurrentMark.inline.hpp" 32 #include "gc/g1/heapRegionManager.inline.hpp" 33 #include "gc/g1/heapRegionSet.inline.hpp" 34 #include "gc/shared/taskqueue.hpp" 35 #include "runtime/orderAccess.hpp" 36 37 G1EvacStats* G1CollectedHeap::alloc_buffer_stats(InCSetState dest) { 38 switch (dest.value()) { 39 case InCSetState::Young: 40 return &_survivor_evac_stats; 41 case InCSetState::Old: 42 return &_old_evac_stats; 43 default: 44 ShouldNotReachHere(); 45 return NULL; // Keep some compilers happy 46 } 47 } 48 49 size_t G1CollectedHeap::desired_plab_sz(InCSetState dest) { 50 size_t gclab_word_size = alloc_buffer_stats(dest)->desired_plab_sz(workers()->active_workers()); 51 // Prevent humongous PLAB sizes for two reasons: 52 // * PLABs are allocated using a similar paths as oops, but should 53 // never be in a humongous region 54 // * Allowing humongous PLABs needlessly churns the region free lists 55 return MIN2(_humongous_object_threshold_in_words, gclab_word_size); 56 } 57 58 // Inline functions for G1CollectedHeap 59 60 // Return the region with the given index. It assumes the index is valid. 61 inline HeapRegion* G1CollectedHeap::region_at(uint index) const { return _hrm->at(index); } 62 63 inline HeapRegion* G1CollectedHeap::next_region_in_humongous(HeapRegion* hr) const { 64 return _hrm->next_region_in_humongous(hr); 65 } 66 67 inline uint G1CollectedHeap::addr_to_region(HeapWord* addr) const { 68 assert(is_in_reserved(addr), 69 "Cannot calculate region index for address " PTR_FORMAT " that is outside of the heap [" PTR_FORMAT ", " PTR_FORMAT ")", 70 p2i(addr), p2i(reserved_region().start()), p2i(reserved_region().end())); 71 return (uint)(pointer_delta(addr, reserved_region().start(), sizeof(uint8_t)) >> HeapRegion::LogOfHRGrainBytes); 72 } 73 74 inline HeapWord* G1CollectedHeap::bottom_addr_for_region(uint index) const { 75 return _hrm->reserved().start() + index * HeapRegion::GrainWords; 76 } 77 78 template <class T> 79 inline HeapRegion* G1CollectedHeap::heap_region_containing(const T addr) const { 80 assert(addr != NULL, "invariant"); 81 assert(is_in_g1_reserved((const void*) addr), 82 "Address " PTR_FORMAT " is outside of the heap ranging from [" PTR_FORMAT " to " PTR_FORMAT ")", 83 p2i((void*)addr), p2i(g1_reserved().start()), p2i(g1_reserved().end())); 84 return _hrm->addr_to_region((HeapWord*) addr); 85 } 86 87 inline void G1CollectedHeap::old_set_add(HeapRegion* hr) { 88 _old_set.add(hr); 89 } 90 91 inline void G1CollectedHeap::old_set_remove(HeapRegion* hr) { 92 _old_set.remove(hr); 93 } 94 95 inline void G1CollectedHeap::archive_set_add(HeapRegion* hr) { 96 _archive_set.add(hr); 97 } 98 99 // It dirties the cards that cover the block so that the post 100 // write barrier never queues anything when updating objects on this 101 // block. It is assumed (and in fact we assert) that the block 102 // belongs to a young region. 103 inline void 104 G1CollectedHeap::dirty_young_block(HeapWord* start, size_t word_size) { 105 assert_heap_not_locked(); 106 107 // Assign the containing region to containing_hr so that we don't 108 // have to keep calling heap_region_containing() in the 109 // asserts below. 110 DEBUG_ONLY(HeapRegion* containing_hr = heap_region_containing(start);) 111 assert(word_size > 0, "pre-condition"); 112 assert(containing_hr->is_in(start), "it should contain start"); 113 assert(containing_hr->is_young(), "it should be young"); 114 assert(!containing_hr->is_humongous(), "it should not be humongous"); 115 116 HeapWord* end = start + word_size; 117 assert(containing_hr->is_in(end - 1), "it should also contain end - 1"); 118 119 MemRegion mr(start, end); 120 card_table()->g1_mark_as_young(mr); 121 } 122 123 inline RefToScanQueue* G1CollectedHeap::task_queue(uint i) const { 124 return _task_queues->queue(i); 125 } 126 127 inline bool G1CollectedHeap::is_marked_next(oop obj) const { 128 return _cm->next_mark_bitmap()->is_marked((HeapWord*)obj); 129 } 130 131 inline bool G1CollectedHeap::is_in_cset(oop obj) { 132 return is_in_cset((HeapWord*)obj); 133 } 134 135 inline bool G1CollectedHeap::is_in_cset(HeapWord* addr) { 136 return _in_cset_fast_test.is_in_cset(addr); 137 } 138 139 bool G1CollectedHeap::is_in_cset(const HeapRegion* hr) { 140 return _in_cset_fast_test.is_in_cset(hr); 141 } 142 143 bool G1CollectedHeap::is_in_cset_or_humongous(const oop obj) { 144 return _in_cset_fast_test.is_in_cset_or_humongous((HeapWord*)obj); 145 } 146 147 InCSetState G1CollectedHeap::in_cset_state(const oop obj) { 148 return _in_cset_fast_test.at((HeapWord*)obj); 149 } 150 151 void G1CollectedHeap::register_humongous_region_with_cset(uint index) { 152 _in_cset_fast_test.set_humongous(index); 153 } 154 155 #ifndef PRODUCT 156 // Support for G1EvacuationFailureALot 157 158 inline bool 159 G1CollectedHeap::evacuation_failure_alot_for_gc_type(bool for_young_gc, 160 bool during_initial_mark, 161 bool mark_or_rebuild_in_progress) { 162 bool res = false; 163 if (mark_or_rebuild_in_progress) { 164 res |= G1EvacuationFailureALotDuringConcMark; 165 } 166 if (during_initial_mark) { 167 res |= G1EvacuationFailureALotDuringInitialMark; 168 } 169 if (for_young_gc) { 170 res |= G1EvacuationFailureALotDuringYoungGC; 171 } else { 172 // GCs are mixed 173 res |= G1EvacuationFailureALotDuringMixedGC; 174 } 175 return res; 176 } 177 178 inline void 179 G1CollectedHeap::set_evacuation_failure_alot_for_current_gc() { 180 if (G1EvacuationFailureALot) { 181 // Note we can't assert that _evacuation_failure_alot_for_current_gc 182 // is clear here. It may have been set during a previous GC but that GC 183 // did not copy enough objects (i.e. G1EvacuationFailureALotCount) to 184 // trigger an evacuation failure and clear the flags and and counts. 185 186 // Check if we have gone over the interval. 187 const size_t gc_num = total_collections(); 188 const size_t elapsed_gcs = gc_num - _evacuation_failure_alot_gc_number; 189 190 _evacuation_failure_alot_for_current_gc = (elapsed_gcs >= G1EvacuationFailureALotInterval); 191 192 // Now check if G1EvacuationFailureALot is enabled for the current GC type. 193 const bool in_young_only_phase = collector_state()->in_young_only_phase(); 194 const bool in_initial_mark_gc = collector_state()->in_initial_mark_gc(); 195 const bool mark_or_rebuild_in_progress = collector_state()->mark_or_rebuild_in_progress(); 196 197 _evacuation_failure_alot_for_current_gc &= 198 evacuation_failure_alot_for_gc_type(in_young_only_phase, 199 in_initial_mark_gc, 200 mark_or_rebuild_in_progress); 201 } 202 } 203 204 inline bool G1CollectedHeap::evacuation_should_fail() { 205 if (!G1EvacuationFailureALot || !_evacuation_failure_alot_for_current_gc) { 206 return false; 207 } 208 // G1EvacuationFailureALot is in effect for current GC 209 // Access to _evacuation_failure_alot_count is not atomic; 210 // the value does not have to be exact. 211 if (++_evacuation_failure_alot_count < G1EvacuationFailureALotCount) { 212 return false; 213 } 214 _evacuation_failure_alot_count = 0; 215 return true; 216 } 217 218 inline void G1CollectedHeap::reset_evacuation_should_fail() { 219 if (G1EvacuationFailureALot) { 220 _evacuation_failure_alot_gc_number = total_collections(); 221 _evacuation_failure_alot_count = 0; 222 _evacuation_failure_alot_for_current_gc = false; 223 } 224 } 225 #endif // #ifndef PRODUCT 226 227 inline bool G1CollectedHeap::is_in_young(const oop obj) { 228 if (obj == NULL) { 229 return false; 230 } 231 return heap_region_containing(obj)->is_young(); 232 } 233 234 inline bool G1CollectedHeap::is_obj_dead(const oop obj) const { 235 if (obj == NULL) { 236 return false; 237 } 238 return is_obj_dead(obj, heap_region_containing(obj)); 239 } 240 241 inline bool G1CollectedHeap::is_obj_ill(const oop obj) const { 242 if (obj == NULL) { 243 return false; 244 } 245 return is_obj_ill(obj, heap_region_containing(obj)); 246 } 247 248 inline bool G1CollectedHeap::is_obj_dead_full(const oop obj, const HeapRegion* hr) const { 249 return !is_marked_next(obj) && !hr->is_archive(); 250 } 251 252 inline bool G1CollectedHeap::is_obj_dead_full(const oop obj) const { 253 return is_obj_dead_full(obj, heap_region_containing(obj)); 254 } 255 256 inline void G1CollectedHeap::set_humongous_reclaim_candidate(uint region, bool value) { 257 assert(_hrm->at(region)->is_starts_humongous(), "Must start a humongous object"); 258 _humongous_reclaim_candidates.set_candidate(region, value); 259 } 260 261 inline bool G1CollectedHeap::is_humongous_reclaim_candidate(uint region) { 262 assert(_hrm->at(region)->is_starts_humongous(), "Must start a humongous object"); 263 return _humongous_reclaim_candidates.is_candidate(region); 264 } 265 266 inline void G1CollectedHeap::set_humongous_is_live(oop obj) { 267 uint region = addr_to_region((HeapWord*)obj); 268 // Clear the flag in the humongous_reclaim_candidates table. Also 269 // reset the entry in the _in_cset_fast_test table so that subsequent references 270 // to the same humongous object do not go into the slow path again. 271 // This is racy, as multiple threads may at the same time enter here, but this 272 // is benign. 273 // During collection we only ever clear the "candidate" flag, and only ever clear the 274 // entry in the in_cset_fast_table. 275 // We only ever evaluate the contents of these tables (in the VM thread) after 276 // having synchronized the worker threads with the VM thread, or in the same 277 // thread (i.e. within the VM thread). 278 if (is_humongous_reclaim_candidate(region)) { 279 set_humongous_reclaim_candidate(region, false); 280 _in_cset_fast_test.clear_humongous(region); 281 } 282 } 283 284 #endif // SHARE_VM_GC_G1_G1COLLECTEDHEAP_INLINE_HPP