1 /* 2 * Copyright (c) 2001, 2012, 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_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" 30 #include "gc_implementation/g1/g1AllocRegion.inline.hpp" 31 #include "gc_implementation/g1/g1CollectorPolicy.hpp" 32 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp" 33 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" 34 #include "utilities/taskqueue.hpp" 35 36 // Inline functions for G1CollectedHeap 37 38 template <class T> 39 inline HeapRegion* 40 G1CollectedHeap::heap_region_containing(const T addr) const { 41 HeapRegion* hr = _hrs.addr_to_region((HeapWord*) addr); 42 // hr can be null if addr in perm_gen 43 if (hr != NULL && hr->continuesHumongous()) { 44 hr = hr->humongous_start_region(); 45 } 46 return hr; 47 } 48 49 template <class T> 50 inline HeapRegion* 51 G1CollectedHeap::heap_region_containing_raw(const T addr) const { 52 assert(_g1_reserved.contains((const void*) addr), "invariant"); 53 HeapRegion* res = _hrs.addr_to_region_unsafe((HeapWord*) addr); 54 return res; 55 } 56 57 inline bool G1CollectedHeap::obj_in_cs(oop obj) { 58 HeapRegion* r = _hrs.addr_to_region((HeapWord*) obj); 59 return r != NULL && r->in_collection_set(); 60 } 61 62 inline HeapWord* 63 G1CollectedHeap::attempt_allocation(size_t word_size, 64 unsigned int* gc_count_before_ret, 65 int* gclocker_retry_count_ret) { 66 assert_heap_not_locked_and_not_at_safepoint(); 67 assert(!isHumongous(word_size), "attempt_allocation() should not " 68 "be called for humongous allocation requests"); 69 70 HeapWord* result = _mutator_alloc_region.attempt_allocation(word_size, 71 false /* bot_updates */); 72 if (result == NULL) { 73 result = attempt_allocation_slow(word_size, 74 gc_count_before_ret, 75 gclocker_retry_count_ret); 76 } 77 assert_heap_not_locked(); 78 if (result != NULL) { 79 dirty_young_block(result, word_size); 80 } 81 return result; 82 } 83 84 inline HeapWord* G1CollectedHeap::survivor_attempt_allocation(size_t 85 word_size) { 86 assert(!isHumongous(word_size), 87 "we should not be seeing humongous-size allocations in this path"); 88 89 HeapWord* result = _survivor_gc_alloc_region.attempt_allocation(word_size, 90 false /* bot_updates */); 91 if (result == NULL) { 92 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); 93 result = _survivor_gc_alloc_region.attempt_allocation_locked(word_size, 94 false /* bot_updates */); 95 } 96 if (result != NULL) { 97 dirty_young_block(result, word_size); 98 } 99 return result; 100 } 101 102 inline HeapWord* G1CollectedHeap::old_attempt_allocation(size_t word_size) { 103 assert(!isHumongous(word_size), 104 "we should not be seeing humongous-size allocations in this path"); 105 106 HeapWord* result = _old_gc_alloc_region.attempt_allocation(word_size, 107 true /* bot_updates */); 108 if (result == NULL) { 109 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); 110 result = _old_gc_alloc_region.attempt_allocation_locked(word_size, 111 true /* bot_updates */); 112 } 113 return result; 114 } 115 116 // It dirties the cards that cover the block so that so that the post 117 // write barrier never queues anything when updating objects on this 118 // block. It is assumed (and in fact we assert) that the block 119 // belongs to a young region. 120 inline void 121 G1CollectedHeap::dirty_young_block(HeapWord* start, size_t word_size) { 122 assert_heap_not_locked(); 123 124 // Assign the containing region to containing_hr so that we don't 125 // have to keep calling heap_region_containing_raw() in the 126 // asserts below. 127 DEBUG_ONLY(HeapRegion* containing_hr = heap_region_containing_raw(start);) 128 assert(containing_hr != NULL && start != NULL && word_size > 0, 129 "pre-condition"); 130 assert(containing_hr->is_in(start), "it should contain start"); 131 assert(containing_hr->is_young(), "it should be young"); 132 assert(!containing_hr->isHumongous(), "it should not be humongous"); 133 134 HeapWord* end = start + word_size; 135 assert(containing_hr->is_in(end - 1), "it should also contain end - 1"); 136 137 MemRegion mr(start, end); 138 ((G1SATBCardTableModRefBS*)_g1h->barrier_set())->g1_dirty_young(mr); 139 } 140 141 inline RefToScanQueue* G1CollectedHeap::task_queue(int i) const { 142 return _task_queues->queue(i); 143 } 144 145 inline bool G1CollectedHeap::isMarkedPrev(oop obj) const { 146 return _cm->prevMarkBitMap()->isMarked((HeapWord *)obj); 147 } 148 149 inline bool G1CollectedHeap::isMarkedNext(oop obj) const { 150 return _cm->nextMarkBitMap()->isMarked((HeapWord *)obj); 151 } 152 153 #ifndef PRODUCT 154 // Support for G1EvacuationFailureALot 155 156 inline bool 157 G1CollectedHeap::evacuation_failure_alot_for_gc_type(bool gcs_are_young, 158 bool during_initial_mark, 159 bool during_marking) { 160 bool res = false; 161 if (during_marking) { 162 res |= G1EvacuationFailureALotDuringConcMark; 163 } 164 if (during_initial_mark) { 165 res |= G1EvacuationFailureALotDuringInitialMark; 166 } 167 if (gcs_are_young) { 168 res |= G1EvacuationFailureALotDuringYoungGC; 169 } else { 170 // GCs are mixed 171 res |= G1EvacuationFailureALotDuringMixedGC; 172 } 173 return res; 174 } 175 176 inline void 177 G1CollectedHeap::set_evacuation_failure_alot_for_current_gc() { 178 if (G1EvacuationFailureALot) { 179 // Note we can't assert that _evacuation_failure_alot_for_current_gc 180 // is clear here. It may have been set during a previous GC but that GC 181 // did not copy enough objects (i.e. G1EvacuationFailureALotCount) to 182 // trigger an evacuation failure and clear the flags and and counts. 183 184 // Check if we have gone over the interval. 185 const size_t gc_num = total_collections(); 186 const size_t elapsed_gcs = gc_num - _evacuation_failure_alot_gc_number; 187 188 _evacuation_failure_alot_for_current_gc = (elapsed_gcs >= G1EvacuationFailureALotInterval); 189 190 // Now check if G1EvacuationFailureALot is enabled for the current GC type. 191 const bool gcs_are_young = g1_policy()->gcs_are_young(); 192 const bool during_im = g1_policy()->during_initial_mark_pause(); 193 const bool during_marking = mark_in_progress(); 194 195 _evacuation_failure_alot_for_current_gc &= 196 evacuation_failure_alot_for_gc_type(gcs_are_young, 197 during_im, 198 during_marking); 199 } 200 } 201 202 inline bool 203 G1CollectedHeap::evacuation_should_fail() { 204 if (!G1EvacuationFailureALot || !_evacuation_failure_alot_for_current_gc) { 205 return false; 206 } 207 // G1EvacuationFailureALot is in effect for current GC 208 // Access to _evacuation_failure_alot_count is not atomic; 209 // the value does not have to be exact. 210 if (++_evacuation_failure_alot_count < G1EvacuationFailureALotCount) { 211 return false; 212 } 213 _evacuation_failure_alot_count = 0; 214 return true; 215 } 216 217 inline void G1CollectedHeap::reset_evacuation_should_fail() { 218 if (G1EvacuationFailureALot) { 219 _evacuation_failure_alot_gc_number = total_collections(); 220 _evacuation_failure_alot_count = 0; 221 _evacuation_failure_alot_for_current_gc = false; 222 } 223 } 224 #endif // #ifndef PRODUCT 225 226 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_INLINE_HPP