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   g1_barrier_set()->g1_mark_as_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