Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 2436:8f1042ff784d
7020042: G1: Partially remove fix for 6994628
Summary: Disable reference discovery and processing during concurrent marking by disabling fix for 6994628.
Reviewed-by: tonyp, ysr
author | johnc |
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date | Fri, 18 Feb 2011 10:07:34 -0800 |
parents | 371bbc844bf1 |
children | 49a67202bc67 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2011, 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_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP | |
27 | |
28 #include "gc_implementation/g1/concurrentMark.hpp" | |
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29 #include "gc_implementation/g1/g1AllocRegion.hpp" |
1972 | 30 #include "gc_implementation/g1/g1RemSet.hpp" |
2152 | 31 #include "gc_implementation/g1/heapRegionSets.hpp" |
1972 | 32 #include "gc_implementation/parNew/parGCAllocBuffer.hpp" |
33 #include "memory/barrierSet.hpp" | |
34 #include "memory/memRegion.hpp" | |
35 #include "memory/sharedHeap.hpp" | |
36 | |
342 | 37 // A "G1CollectedHeap" is an implementation of a java heap for HotSpot. |
38 // It uses the "Garbage First" heap organization and algorithm, which | |
39 // may combine concurrent marking with parallel, incremental compaction of | |
40 // heap subsets that will yield large amounts of garbage. | |
41 | |
42 class HeapRegion; | |
43 class HeapRegionSeq; | |
2173 | 44 class HRRSCleanupTask; |
342 | 45 class PermanentGenerationSpec; |
46 class GenerationSpec; | |
47 class OopsInHeapRegionClosure; | |
48 class G1ScanHeapEvacClosure; | |
49 class ObjectClosure; | |
50 class SpaceClosure; | |
51 class CompactibleSpaceClosure; | |
52 class Space; | |
53 class G1CollectorPolicy; | |
54 class GenRemSet; | |
55 class G1RemSet; | |
56 class HeapRegionRemSetIterator; | |
57 class ConcurrentMark; | |
58 class ConcurrentMarkThread; | |
59 class ConcurrentG1Refine; | |
60 | |
1709 | 61 typedef OverflowTaskQueue<StarTask> RefToScanQueue; |
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62 typedef GenericTaskQueueSet<RefToScanQueue> RefToScanQueueSet; |
342 | 63 |
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64 typedef int RegionIdx_t; // needs to hold [ 0..max_regions() ) |
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65 typedef int CardIdx_t; // needs to hold [ 0..CardsPerRegion ) |
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66 |
342 | 67 enum GCAllocPurpose { |
68 GCAllocForTenured, | |
69 GCAllocForSurvived, | |
70 GCAllocPurposeCount | |
71 }; | |
72 | |
73 class YoungList : public CHeapObj { | |
74 private: | |
75 G1CollectedHeap* _g1h; | |
76 | |
77 HeapRegion* _head; | |
78 | |
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79 HeapRegion* _survivor_head; |
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80 HeapRegion* _survivor_tail; |
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81 |
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82 HeapRegion* _curr; |
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83 |
342 | 84 size_t _length; |
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85 size_t _survivor_length; |
342 | 86 |
87 size_t _last_sampled_rs_lengths; | |
88 size_t _sampled_rs_lengths; | |
89 | |
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90 void empty_list(HeapRegion* list); |
342 | 91 |
92 public: | |
93 YoungList(G1CollectedHeap* g1h); | |
94 | |
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95 void push_region(HeapRegion* hr); |
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96 void add_survivor_region(HeapRegion* hr); |
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97 |
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98 void empty_list(); |
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99 bool is_empty() { return _length == 0; } |
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100 size_t length() { return _length; } |
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101 size_t survivor_length() { return _survivor_length; } |
342 | 102 |
103 void rs_length_sampling_init(); | |
104 bool rs_length_sampling_more(); | |
105 void rs_length_sampling_next(); | |
106 | |
107 void reset_sampled_info() { | |
108 _last_sampled_rs_lengths = 0; | |
109 } | |
110 size_t sampled_rs_lengths() { return _last_sampled_rs_lengths; } | |
111 | |
112 // for development purposes | |
113 void reset_auxilary_lists(); | |
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114 void clear() { _head = NULL; _length = 0; } |
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115 |
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116 void clear_survivors() { |
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117 _survivor_head = NULL; |
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118 _survivor_tail = NULL; |
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119 _survivor_length = 0; |
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120 } |
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121 |
342 | 122 HeapRegion* first_region() { return _head; } |
123 HeapRegion* first_survivor_region() { return _survivor_head; } | |
545 | 124 HeapRegion* last_survivor_region() { return _survivor_tail; } |
342 | 125 |
126 // debugging | |
127 bool check_list_well_formed(); | |
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128 bool check_list_empty(bool check_sample = true); |
342 | 129 void print(); |
130 }; | |
131 | |
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132 class MutatorAllocRegion : public G1AllocRegion { |
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133 protected: |
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134 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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135 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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136 public: |
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137 MutatorAllocRegion() |
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138 : G1AllocRegion("Mutator Alloc Region", false /* bot_updates */) { } |
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139 }; |
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140 |
342 | 141 class RefineCardTableEntryClosure; |
142 class G1CollectedHeap : public SharedHeap { | |
143 friend class VM_G1CollectForAllocation; | |
144 friend class VM_GenCollectForPermanentAllocation; | |
145 friend class VM_G1CollectFull; | |
146 friend class VM_G1IncCollectionPause; | |
147 friend class VMStructs; | |
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148 friend class MutatorAllocRegion; |
342 | 149 |
150 // Closures used in implementation. | |
151 friend class G1ParCopyHelper; | |
152 friend class G1IsAliveClosure; | |
153 friend class G1EvacuateFollowersClosure; | |
154 friend class G1ParScanThreadState; | |
155 friend class G1ParScanClosureSuper; | |
156 friend class G1ParEvacuateFollowersClosure; | |
157 friend class G1ParTask; | |
158 friend class G1FreeGarbageRegionClosure; | |
159 friend class RefineCardTableEntryClosure; | |
160 friend class G1PrepareCompactClosure; | |
161 friend class RegionSorter; | |
2152 | 162 friend class RegionResetter; |
342 | 163 friend class CountRCClosure; |
164 friend class EvacPopObjClosure; | |
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165 friend class G1ParCleanupCTTask; |
342 | 166 |
167 // Other related classes. | |
168 friend class G1MarkSweep; | |
169 | |
170 private: | |
171 // The one and only G1CollectedHeap, so static functions can find it. | |
172 static G1CollectedHeap* _g1h; | |
173 | |
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174 static size_t _humongous_object_threshold_in_words; |
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175 |
342 | 176 // Storage for the G1 heap (excludes the permanent generation). |
177 VirtualSpace _g1_storage; | |
178 MemRegion _g1_reserved; | |
179 | |
180 // The part of _g1_storage that is currently committed. | |
181 MemRegion _g1_committed; | |
182 | |
183 // The maximum part of _g1_storage that has ever been committed. | |
184 MemRegion _g1_max_committed; | |
185 | |
2152 | 186 // The master free list. It will satisfy all new region allocations. |
187 MasterFreeRegionList _free_list; | |
188 | |
189 // The secondary free list which contains regions that have been | |
190 // freed up during the cleanup process. This will be appended to the | |
191 // master free list when appropriate. | |
192 SecondaryFreeRegionList _secondary_free_list; | |
193 | |
194 // It keeps track of the humongous regions. | |
195 MasterHumongousRegionSet _humongous_set; | |
342 | 196 |
197 // The number of regions we could create by expansion. | |
198 size_t _expansion_regions; | |
199 | |
200 // The block offset table for the G1 heap. | |
201 G1BlockOffsetSharedArray* _bot_shared; | |
202 | |
203 // Move all of the regions off the free lists, then rebuild those free | |
204 // lists, before and after full GC. | |
205 void tear_down_region_lists(); | |
206 void rebuild_region_lists(); | |
207 | |
208 // The sequence of all heap regions in the heap. | |
209 HeapRegionSeq* _hrs; | |
210 | |
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211 // Alloc region used to satisfy mutator allocation requests. |
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212 MutatorAllocRegion _mutator_alloc_region; |
342 | 213 |
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214 // It resets the mutator alloc region before new allocations can take place. |
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215 void init_mutator_alloc_region(); |
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216 |
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217 // It releases the mutator alloc region. |
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218 void release_mutator_alloc_region(); |
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219 |
636 | 220 void abandon_gc_alloc_regions(); |
342 | 221 |
222 // The to-space memory regions into which objects are being copied during | |
223 // a GC. | |
224 HeapRegion* _gc_alloc_regions[GCAllocPurposeCount]; | |
545 | 225 size_t _gc_alloc_region_counts[GCAllocPurposeCount]; |
636 | 226 // These are the regions, one per GCAllocPurpose, that are half-full |
227 // at the end of a collection and that we want to reuse during the | |
228 // next collection. | |
229 HeapRegion* _retained_gc_alloc_regions[GCAllocPurposeCount]; | |
230 // This specifies whether we will keep the last half-full region at | |
231 // the end of a collection so that it can be reused during the next | |
232 // collection (this is specified per GCAllocPurpose) | |
233 bool _retain_gc_alloc_region[GCAllocPurposeCount]; | |
342 | 234 |
235 // A list of the regions that have been set to be alloc regions in the | |
236 // current collection. | |
237 HeapRegion* _gc_alloc_region_list; | |
238 | |
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239 // Determines PLAB size for a particular allocation purpose. |
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240 static size_t desired_plab_sz(GCAllocPurpose purpose); |
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241 |
2152 | 242 // When called by par thread, requires the FreeList_lock to be held. |
342 | 243 void push_gc_alloc_region(HeapRegion* hr); |
244 | |
245 // This should only be called single-threaded. Undeclares all GC alloc | |
246 // regions. | |
247 void forget_alloc_region_list(); | |
248 | |
249 // Should be used to set an alloc region, because there's other | |
250 // associated bookkeeping. | |
251 void set_gc_alloc_region(int purpose, HeapRegion* r); | |
252 | |
253 // Check well-formedness of alloc region list. | |
254 bool check_gc_alloc_regions(); | |
255 | |
256 // Outside of GC pauses, the number of bytes used in all regions other | |
257 // than the current allocation region. | |
258 size_t _summary_bytes_used; | |
259 | |
526 | 260 // This is used for a quick test on whether a reference points into |
261 // the collection set or not. Basically, we have an array, with one | |
262 // byte per region, and that byte denotes whether the corresponding | |
263 // region is in the collection set or not. The entry corresponding | |
264 // the bottom of the heap, i.e., region 0, is pointed to by | |
265 // _in_cset_fast_test_base. The _in_cset_fast_test field has been | |
266 // biased so that it actually points to address 0 of the address | |
267 // space, to make the test as fast as possible (we can simply shift | |
268 // the address to address into it, instead of having to subtract the | |
269 // bottom of the heap from the address before shifting it; basically | |
270 // it works in the same way the card table works). | |
271 bool* _in_cset_fast_test; | |
272 | |
273 // The allocated array used for the fast test on whether a reference | |
274 // points into the collection set or not. This field is also used to | |
275 // free the array. | |
276 bool* _in_cset_fast_test_base; | |
277 | |
278 // The length of the _in_cset_fast_test_base array. | |
279 size_t _in_cset_fast_test_length; | |
280 | |
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281 volatile unsigned _gc_time_stamp; |
342 | 282 |
283 size_t* _surviving_young_words; | |
284 | |
285 void setup_surviving_young_words(); | |
286 void update_surviving_young_words(size_t* surv_young_words); | |
287 void cleanup_surviving_young_words(); | |
288 | |
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289 // It decides whether an explicit GC should start a concurrent cycle |
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290 // instead of doing a STW GC. Currently, a concurrent cycle is |
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291 // explicitly started if: |
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292 // (a) cause == _gc_locker and +GCLockerInvokesConcurrent, or |
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293 // (b) cause == _java_lang_system_gc and +ExplicitGCInvokesConcurrent. |
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294 bool should_do_concurrent_full_gc(GCCause::Cause cause); |
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295 |
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296 // Keeps track of how many "full collections" (i.e., Full GCs or |
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297 // concurrent cycles) we have completed. The number of them we have |
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298 // started is maintained in _total_full_collections in CollectedHeap. |
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299 volatile unsigned int _full_collections_completed; |
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300 |
1973 | 301 // These are macros so that, if the assert fires, we get the correct |
302 // line number, file, etc. | |
303 | |
2361 | 304 #define heap_locking_asserts_err_msg(_extra_message_) \ |
2152 | 305 err_msg("%s : Heap_lock locked: %s, at safepoint: %s, is VM thread: %s", \ |
2361 | 306 (_extra_message_), \ |
2152 | 307 BOOL_TO_STR(Heap_lock->owned_by_self()), \ |
308 BOOL_TO_STR(SafepointSynchronize::is_at_safepoint()), \ | |
309 BOOL_TO_STR(Thread::current()->is_VM_thread())) | |
1973 | 310 |
311 #define assert_heap_locked() \ | |
312 do { \ | |
313 assert(Heap_lock->owned_by_self(), \ | |
314 heap_locking_asserts_err_msg("should be holding the Heap_lock")); \ | |
315 } while (0) | |
316 | |
2361 | 317 #define assert_heap_locked_or_at_safepoint(_should_be_vm_thread_) \ |
1973 | 318 do { \ |
319 assert(Heap_lock->owned_by_self() || \ | |
2152 | 320 (SafepointSynchronize::is_at_safepoint() && \ |
2361 | 321 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread())), \ |
1973 | 322 heap_locking_asserts_err_msg("should be holding the Heap_lock or " \ |
323 "should be at a safepoint")); \ | |
324 } while (0) | |
325 | |
326 #define assert_heap_locked_and_not_at_safepoint() \ | |
327 do { \ | |
328 assert(Heap_lock->owned_by_self() && \ | |
329 !SafepointSynchronize::is_at_safepoint(), \ | |
330 heap_locking_asserts_err_msg("should be holding the Heap_lock and " \ | |
331 "should not be at a safepoint")); \ | |
332 } while (0) | |
333 | |
334 #define assert_heap_not_locked() \ | |
335 do { \ | |
336 assert(!Heap_lock->owned_by_self(), \ | |
337 heap_locking_asserts_err_msg("should not be holding the Heap_lock")); \ | |
338 } while (0) | |
339 | |
340 #define assert_heap_not_locked_and_not_at_safepoint() \ | |
341 do { \ | |
342 assert(!Heap_lock->owned_by_self() && \ | |
343 !SafepointSynchronize::is_at_safepoint(), \ | |
344 heap_locking_asserts_err_msg("should not be holding the Heap_lock and " \ | |
345 "should not be at a safepoint")); \ | |
346 } while (0) | |
347 | |
2361 | 348 #define assert_at_safepoint(_should_be_vm_thread_) \ |
1973 | 349 do { \ |
2152 | 350 assert(SafepointSynchronize::is_at_safepoint() && \ |
2361 | 351 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread()), \ |
1973 | 352 heap_locking_asserts_err_msg("should be at a safepoint")); \ |
353 } while (0) | |
354 | |
355 #define assert_not_at_safepoint() \ | |
356 do { \ | |
357 assert(!SafepointSynchronize::is_at_safepoint(), \ | |
358 heap_locking_asserts_err_msg("should not be at a safepoint")); \ | |
359 } while (0) | |
360 | |
342 | 361 protected: |
362 | |
363 // Returns "true" iff none of the gc alloc regions have any allocations | |
364 // since the last call to "save_marks". | |
365 bool all_alloc_regions_no_allocs_since_save_marks(); | |
545 | 366 // Perform finalization stuff on all allocation regions. |
367 void retire_all_alloc_regions(); | |
342 | 368 |
369 // The number of regions allocated to hold humongous objects. | |
370 int _num_humongous_regions; | |
371 YoungList* _young_list; | |
372 | |
373 // The current policy object for the collector. | |
374 G1CollectorPolicy* _g1_policy; | |
375 | |
2152 | 376 // This is the second level of trying to allocate a new region. If |
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377 // new_region() didn't find a region on the free_list, this call will |
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378 // check whether there's anything available on the |
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379 // secondary_free_list and/or wait for more regions to appear on |
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380 // that list, if _free_regions_coming is set. |
2361 | 381 HeapRegion* new_region_try_secondary_free_list(); |
342 | 382 |
2361 | 383 // Try to allocate a single non-humongous HeapRegion sufficient for |
384 // an allocation of the given word_size. If do_expand is true, | |
385 // attempt to expand the heap if necessary to satisfy the allocation | |
386 // request. | |
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387 HeapRegion* new_region(size_t word_size, bool do_expand); |
342 | 388 |
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389 // Try to allocate a new region to be used for allocation by |
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390 // a GC thread. It will try to expand the heap if no region is |
2361 | 391 // available. |
2152 | 392 HeapRegion* new_gc_alloc_region(int purpose, size_t word_size); |
393 | |
2361 | 394 // Attempt to satisfy a humongous allocation request of the given |
395 // size by finding a contiguous set of free regions of num_regions | |
396 // length and remove them from the master free list. Return the | |
397 // index of the first region or -1 if the search was unsuccessful. | |
2152 | 398 int humongous_obj_allocate_find_first(size_t num_regions, size_t word_size); |
342 | 399 |
2361 | 400 // Initialize a contiguous set of free regions of length num_regions |
401 // and starting at index first so that they appear as a single | |
402 // humongous region. | |
403 HeapWord* humongous_obj_allocate_initialize_regions(int first, | |
404 size_t num_regions, | |
405 size_t word_size); | |
406 | |
407 // Attempt to allocate a humongous object of the given size. Return | |
408 // NULL if unsuccessful. | |
2152 | 409 HeapWord* humongous_obj_allocate(size_t word_size); |
1973 | 410 |
411 // The following two methods, allocate_new_tlab() and | |
412 // mem_allocate(), are the two main entry points from the runtime | |
413 // into the G1's allocation routines. They have the following | |
414 // assumptions: | |
415 // | |
416 // * They should both be called outside safepoints. | |
417 // | |
418 // * They should both be called without holding the Heap_lock. | |
419 // | |
420 // * All allocation requests for new TLABs should go to | |
421 // allocate_new_tlab(). | |
422 // | |
423 // * All non-TLAB allocation requests should go to mem_allocate() | |
424 // and mem_allocate() should never be called with is_tlab == true. | |
425 // | |
426 // * If either call cannot satisfy the allocation request using the | |
427 // current allocating region, they will try to get a new one. If | |
428 // this fails, they will attempt to do an evacuation pause and | |
429 // retry the allocation. | |
430 // | |
431 // * If all allocation attempts fail, even after trying to schedule | |
432 // an evacuation pause, allocate_new_tlab() will return NULL, | |
433 // whereas mem_allocate() will attempt a heap expansion and/or | |
434 // schedule a Full GC. | |
435 // | |
436 // * We do not allow humongous-sized TLABs. So, allocate_new_tlab | |
437 // should never be called with word_size being humongous. All | |
438 // humongous allocation requests should go to mem_allocate() which | |
439 // will satisfy them with a special path. | |
440 | |
441 virtual HeapWord* allocate_new_tlab(size_t word_size); | |
442 | |
443 virtual HeapWord* mem_allocate(size_t word_size, | |
444 bool is_noref, | |
445 bool is_tlab, /* expected to be false */ | |
446 bool* gc_overhead_limit_was_exceeded); | |
342 | 447 |
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448 // The following three methods take a gc_count_before_ret |
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449 // parameter which is used to return the GC count if the method |
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450 // returns NULL. Given that we are required to read the GC count |
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451 // while holding the Heap_lock, and these paths will take the |
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452 // Heap_lock at some point, it's easier to get them to read the GC |
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453 // count while holding the Heap_lock before they return NULL instead |
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454 // of the caller (namely: mem_allocate()) having to also take the |
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455 // Heap_lock just to read the GC count. |
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456 |
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457 // First-level mutator allocation attempt: try to allocate out of |
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458 // the mutator alloc region without taking the Heap_lock. This |
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459 // should only be used for non-humongous allocations. |
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460 inline HeapWord* attempt_allocation(size_t word_size, |
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461 unsigned int* gc_count_before_ret); |
342 | 462 |
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463 // Second-level mutator allocation attempt: take the Heap_lock and |
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464 // retry the allocation attempt, potentially scheduling a GC |
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465 // pause. This should only be used for non-humongous allocations. |
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466 HeapWord* attempt_allocation_slow(size_t word_size, |
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467 unsigned int* gc_count_before_ret); |
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468 |
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469 // Takes the Heap_lock and attempts a humongous allocation. It can |
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470 // potentially schedule a GC pause. |
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471 HeapWord* attempt_allocation_humongous(size_t word_size, |
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472 unsigned int* gc_count_before_ret); |
1973 | 473 |
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474 // Allocation attempt that should be called during safepoints (e.g., |
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475 // at the end of a successful GC). expect_null_mutator_alloc_region |
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476 // specifies whether the mutator alloc region is expected to be NULL |
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477 // or not. |
1973 | 478 HeapWord* attempt_allocation_at_safepoint(size_t word_size, |
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479 bool expect_null_mutator_alloc_region); |
1973 | 480 |
481 // It dirties the cards that cover the block so that so that the post | |
482 // write barrier never queues anything when updating objects on this | |
483 // block. It is assumed (and in fact we assert) that the block | |
484 // belongs to a young region. | |
485 inline void dirty_young_block(HeapWord* start, size_t word_size); | |
342 | 486 |
487 // Allocate blocks during garbage collection. Will ensure an | |
488 // allocation region, either by picking one or expanding the | |
489 // heap, and then allocate a block of the given size. The block | |
490 // may not be a humongous - it must fit into a single heap region. | |
491 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
492 | |
493 HeapWord* allocate_during_gc_slow(GCAllocPurpose purpose, | |
494 HeapRegion* alloc_region, | |
495 bool par, | |
496 size_t word_size); | |
497 | |
498 // Ensure that no further allocations can happen in "r", bearing in mind | |
499 // that parallel threads might be attempting allocations. | |
500 void par_allocate_remaining_space(HeapRegion* r); | |
501 | |
545 | 502 // Retires an allocation region when it is full or at the end of a |
503 // GC pause. | |
504 void retire_alloc_region(HeapRegion* alloc_region, bool par); | |
505 | |
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506 // These two methods are the "callbacks" from the G1AllocRegion class. |
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507 |
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508 HeapRegion* new_mutator_alloc_region(size_t word_size, bool force); |
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509 void retire_mutator_alloc_region(HeapRegion* alloc_region, |
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510 size_t allocated_bytes); |
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511 |
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512 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
1973 | 513 // inspection request and should collect the entire heap |
514 // - if clear_all_soft_refs is true, all soft references should be | |
515 // cleared during the GC | |
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516 // - if explicit_gc is false, word_size describes the allocation that |
1973 | 517 // the GC should attempt (at least) to satisfy |
518 // - it returns false if it is unable to do the collection due to the | |
519 // GC locker being active, true otherwise | |
520 bool do_collection(bool explicit_gc, | |
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521 bool clear_all_soft_refs, |
342 | 522 size_t word_size); |
523 | |
524 // Callback from VM_G1CollectFull operation. | |
525 // Perform a full collection. | |
526 void do_full_collection(bool clear_all_soft_refs); | |
527 | |
528 // Resize the heap if necessary after a full collection. If this is | |
529 // after a collect-for allocation, "word_size" is the allocation size, | |
530 // and will be considered part of the used portion of the heap. | |
531 void resize_if_necessary_after_full_collection(size_t word_size); | |
532 | |
533 // Callback from VM_G1CollectForAllocation operation. | |
534 // This function does everything necessary/possible to satisfy a | |
535 // failed allocation request (including collection, expansion, etc.) | |
1973 | 536 HeapWord* satisfy_failed_allocation(size_t word_size, bool* succeeded); |
342 | 537 |
538 // Attempting to expand the heap sufficiently | |
539 // to support an allocation of the given "word_size". If | |
540 // successful, perform the allocation and return the address of the | |
541 // allocated block, or else "NULL". | |
1973 | 542 HeapWord* expand_and_allocate(size_t word_size); |
342 | 543 |
544 public: | |
545 // Expand the garbage-first heap by at least the given size (in bytes!). | |
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546 // Returns true if the heap was expanded by the requested amount; |
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547 // false otherwise. |
342 | 548 // (Rounds up to a HeapRegion boundary.) |
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549 bool expand(size_t expand_bytes); |
342 | 550 |
551 // Do anything common to GC's. | |
552 virtual void gc_prologue(bool full); | |
553 virtual void gc_epilogue(bool full); | |
554 | |
526 | 555 // We register a region with the fast "in collection set" test. We |
556 // simply set to true the array slot corresponding to this region. | |
557 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
558 assert(_in_cset_fast_test_base != NULL, "sanity"); | |
559 assert(r->in_collection_set(), "invariant"); | |
560 int index = r->hrs_index(); | |
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561 assert(0 <= index && (size_t) index < _in_cset_fast_test_length, "invariant"); |
526 | 562 assert(!_in_cset_fast_test_base[index], "invariant"); |
563 _in_cset_fast_test_base[index] = true; | |
564 } | |
565 | |
566 // This is a fast test on whether a reference points into the | |
567 // collection set or not. It does not assume that the reference | |
568 // points into the heap; if it doesn't, it will return false. | |
569 bool in_cset_fast_test(oop obj) { | |
570 assert(_in_cset_fast_test != NULL, "sanity"); | |
571 if (_g1_committed.contains((HeapWord*) obj)) { | |
572 // no need to subtract the bottom of the heap from obj, | |
573 // _in_cset_fast_test is biased | |
574 size_t index = ((size_t) obj) >> HeapRegion::LogOfHRGrainBytes; | |
575 bool ret = _in_cset_fast_test[index]; | |
576 // let's make sure the result is consistent with what the slower | |
577 // test returns | |
578 assert( ret || !obj_in_cs(obj), "sanity"); | |
579 assert(!ret || obj_in_cs(obj), "sanity"); | |
580 return ret; | |
581 } else { | |
582 return false; | |
583 } | |
584 } | |
585 | |
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586 void clear_cset_fast_test() { |
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587 assert(_in_cset_fast_test_base != NULL, "sanity"); |
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588 memset(_in_cset_fast_test_base, false, |
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589 _in_cset_fast_test_length * sizeof(bool)); |
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590 } |
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591 |
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592 // This is called at the end of either a concurrent cycle or a Full |
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593 // GC to update the number of full collections completed. Those two |
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594 // can happen in a nested fashion, i.e., we start a concurrent |
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595 // cycle, a Full GC happens half-way through it which ends first, |
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596 // and then the cycle notices that a Full GC happened and ends |
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597 // too. The concurrent parameter is a boolean to help us do a bit |
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598 // tighter consistency checking in the method. If concurrent is |
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599 // false, the caller is the inner caller in the nesting (i.e., the |
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600 // Full GC). If concurrent is true, the caller is the outer caller |
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601 // in this nesting (i.e., the concurrent cycle). Further nesting is |
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602 // not currently supported. The end of the this call also notifies |
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603 // the FullGCCount_lock in case a Java thread is waiting for a full |
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604 // GC to happen (e.g., it called System.gc() with |
1656
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605 // +ExplicitGCInvokesConcurrent). |
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606 void increment_full_collections_completed(bool concurrent); |
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607 |
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608 unsigned int full_collections_completed() { |
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609 return _full_collections_completed; |
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610 } |
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611 |
342 | 612 protected: |
613 | |
614 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
615 // (Rounds down to a HeapRegion boundary.) | |
616 virtual void shrink(size_t expand_bytes); | |
617 void shrink_helper(size_t expand_bytes); | |
618 | |
1709 | 619 #if TASKQUEUE_STATS |
620 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
621 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; | |
622 void reset_taskqueue_stats(); | |
623 #endif // TASKQUEUE_STATS | |
624 | |
1973 | 625 // Schedule the VM operation that will do an evacuation pause to |
626 // satisfy an allocation request of word_size. *succeeded will | |
627 // return whether the VM operation was successful (it did do an | |
628 // evacuation pause) or not (another thread beat us to it or the GC | |
629 // locker was active). Given that we should not be holding the | |
630 // Heap_lock when we enter this method, we will pass the | |
631 // gc_count_before (i.e., total_collections()) as a parameter since | |
632 // it has to be read while holding the Heap_lock. Currently, both | |
633 // methods that call do_collection_pause() release the Heap_lock | |
634 // before the call, so it's easy to read gc_count_before just before. | |
635 HeapWord* do_collection_pause(size_t word_size, | |
636 unsigned int gc_count_before, | |
637 bool* succeeded); | |
342 | 638 |
639 // The guts of the incremental collection pause, executed by the vm | |
1973 | 640 // thread. It returns false if it is unable to do the collection due |
641 // to the GC locker being active, true otherwise | |
642 bool do_collection_pause_at_safepoint(double target_pause_time_ms); | |
342 | 643 |
644 // Actually do the work of evacuating the collection set. | |
1973 | 645 void evacuate_collection_set(); |
342 | 646 |
647 // The g1 remembered set of the heap. | |
648 G1RemSet* _g1_rem_set; | |
649 // And it's mod ref barrier set, used to track updates for the above. | |
650 ModRefBarrierSet* _mr_bs; | |
651 | |
616
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652 // A set of cards that cover the objects for which the Rsets should be updated |
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653 // concurrently after the collection. |
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654 DirtyCardQueueSet _dirty_card_queue_set; |
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655 |
342 | 656 // The Heap Region Rem Set Iterator. |
657 HeapRegionRemSetIterator** _rem_set_iterator; | |
658 | |
659 // The closure used to refine a single card. | |
660 RefineCardTableEntryClosure* _refine_cte_cl; | |
661 | |
662 // A function to check the consistency of dirty card logs. | |
663 void check_ct_logs_at_safepoint(); | |
664 | |
1705 | 665 // A DirtyCardQueueSet that is used to hold cards that contain |
666 // references into the current collection set. This is used to | |
667 // update the remembered sets of the regions in the collection | |
668 // set in the event of an evacuation failure. | |
669 DirtyCardQueueSet _into_cset_dirty_card_queue_set; | |
670 | |
342 | 671 // After a collection pause, make the regions in the CS into free |
672 // regions. | |
673 void free_collection_set(HeapRegion* cs_head); | |
674 | |
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675 // Abandon the current collection set without recording policy |
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676 // statistics or updating free lists. |
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677 void abandon_collection_set(HeapRegion* cs_head); |
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678 |
342 | 679 // Applies "scan_non_heap_roots" to roots outside the heap, |
680 // "scan_rs" to roots inside the heap (having done "set_region" to | |
681 // indicate the region in which the root resides), and does "scan_perm" | |
682 // (setting the generation to the perm generation.) If "scan_rs" is | |
683 // NULL, then this step is skipped. The "worker_i" | |
684 // param is for use with parallel roots processing, and should be | |
685 // the "i" of the calling parallel worker thread's work(i) function. | |
686 // In the sequential case this param will be ignored. | |
687 void g1_process_strong_roots(bool collecting_perm_gen, | |
688 SharedHeap::ScanningOption so, | |
689 OopClosure* scan_non_heap_roots, | |
690 OopsInHeapRegionClosure* scan_rs, | |
691 OopsInGenClosure* scan_perm, | |
692 int worker_i); | |
693 | |
694 // Apply "blk" to all the weak roots of the system. These include | |
695 // JNI weak roots, the code cache, system dictionary, symbol table, | |
696 // string table, and referents of reachable weak refs. | |
697 void g1_process_weak_roots(OopClosure* root_closure, | |
698 OopClosure* non_root_closure); | |
699 | |
700 // Invoke "save_marks" on all heap regions. | |
701 void save_marks(); | |
702 | |
2361 | 703 // Frees a non-humongous region by initializing its contents and |
2152 | 704 // adding it to the free list that's passed as a parameter (this is |
705 // usually a local list which will be appended to the master free | |
706 // list later). The used bytes of freed regions are accumulated in | |
707 // pre_used. If par is true, the region's RSet will not be freed | |
708 // up. The assumption is that this will be done later. | |
709 void free_region(HeapRegion* hr, | |
710 size_t* pre_used, | |
711 FreeRegionList* free_list, | |
712 bool par); | |
342 | 713 |
2361 | 714 // Frees a humongous region by collapsing it into individual regions |
715 // and calling free_region() for each of them. The freed regions | |
716 // will be added to the free list that's passed as a parameter (this | |
717 // is usually a local list which will be appended to the master free | |
718 // list later). The used bytes of freed regions are accumulated in | |
719 // pre_used. If par is true, the region's RSet will not be freed | |
720 // up. The assumption is that this will be done later. | |
2152 | 721 void free_humongous_region(HeapRegion* hr, |
722 size_t* pre_used, | |
723 FreeRegionList* free_list, | |
724 HumongousRegionSet* humongous_proxy_set, | |
725 bool par); | |
342 | 726 |
727 // The concurrent marker (and the thread it runs in.) | |
728 ConcurrentMark* _cm; | |
729 ConcurrentMarkThread* _cmThread; | |
730 bool _mark_in_progress; | |
731 | |
732 // The concurrent refiner. | |
733 ConcurrentG1Refine* _cg1r; | |
734 | |
735 // The parallel task queues | |
736 RefToScanQueueSet *_task_queues; | |
737 | |
738 // True iff a evacuation has failed in the current collection. | |
739 bool _evacuation_failed; | |
740 | |
741 // Set the attribute indicating whether evacuation has failed in the | |
742 // current collection. | |
743 void set_evacuation_failed(bool b) { _evacuation_failed = b; } | |
744 | |
745 // Failed evacuations cause some logical from-space objects to have | |
746 // forwarding pointers to themselves. Reset them. | |
747 void remove_self_forwarding_pointers(); | |
748 | |
749 // When one is non-null, so is the other. Together, they each pair is | |
750 // an object with a preserved mark, and its mark value. | |
751 GrowableArray<oop>* _objs_with_preserved_marks; | |
752 GrowableArray<markOop>* _preserved_marks_of_objs; | |
753 | |
754 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
755 // word being overwritten with a self-forwarding-pointer. | |
756 void preserve_mark_if_necessary(oop obj, markOop m); | |
757 | |
758 // The stack of evac-failure objects left to be scanned. | |
759 GrowableArray<oop>* _evac_failure_scan_stack; | |
760 // The closure to apply to evac-failure objects. | |
761 | |
762 OopsInHeapRegionClosure* _evac_failure_closure; | |
763 // Set the field above. | |
764 void | |
765 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
766 _evac_failure_closure = evac_failure_closure; | |
767 } | |
768 | |
769 // Push "obj" on the scan stack. | |
770 void push_on_evac_failure_scan_stack(oop obj); | |
771 // Process scan stack entries until the stack is empty. | |
772 void drain_evac_failure_scan_stack(); | |
773 // True iff an invocation of "drain_scan_stack" is in progress; to | |
774 // prevent unnecessary recursion. | |
775 bool _drain_in_progress; | |
776 | |
777 // Do any necessary initialization for evacuation-failure handling. | |
778 // "cl" is the closure that will be used to process evac-failure | |
779 // objects. | |
780 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
781 // Do any necessary cleanup for evacuation-failure handling data | |
782 // structures. | |
783 void finalize_for_evac_failure(); | |
784 | |
785 // An attempt to evacuate "obj" has failed; take necessary steps. | |
786 oop handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, oop obj); | |
787 void handle_evacuation_failure_common(oop obj, markOop m); | |
788 | |
789 | |
790 // Ensure that the relevant gc_alloc regions are set. | |
791 void get_gc_alloc_regions(); | |
636 | 792 // We're done with GC alloc regions. We are going to tear down the |
793 // gc alloc list and remove the gc alloc tag from all the regions on | |
794 // that list. However, we will also retain the last (i.e., the one | |
795 // that is half-full) GC alloc region, per GCAllocPurpose, for | |
796 // possible reuse during the next collection, provided | |
797 // _retain_gc_alloc_region[] indicates that it should be the | |
798 // case. Said regions are kept in the _retained_gc_alloc_regions[] | |
799 // array. If the parameter totally is set, we will not retain any | |
800 // regions, irrespective of what _retain_gc_alloc_region[] | |
801 // indicates. | |
802 void release_gc_alloc_regions(bool totally); | |
803 #ifndef PRODUCT | |
804 // Useful for debugging. | |
805 void print_gc_alloc_regions(); | |
806 #endif // !PRODUCT | |
342 | 807 |
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808 // Instance of the concurrent mark is_alive closure for embedding |
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809 // into the reference processor as the is_alive_non_header. This |
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810 // prevents unnecessary additions to the discovered lists during |
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811 // concurrent discovery. |
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812 G1CMIsAliveClosure _is_alive_closure; |
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813 |
342 | 814 // ("Weak") Reference processing support |
815 ReferenceProcessor* _ref_processor; | |
816 | |
817 enum G1H_process_strong_roots_tasks { | |
818 G1H_PS_mark_stack_oops_do, | |
819 G1H_PS_refProcessor_oops_do, | |
820 // Leave this one last. | |
821 G1H_PS_NumElements | |
822 }; | |
823 | |
824 SubTasksDone* _process_strong_tasks; | |
825 | |
2152 | 826 volatile bool _free_regions_coming; |
342 | 827 |
828 public: | |
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829 |
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830 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
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831 |
342 | 832 void set_refine_cte_cl_concurrency(bool concurrent); |
833 | |
1709 | 834 RefToScanQueue *task_queue(int i) const; |
342 | 835 |
616
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836 // A set of cards where updates happened during the GC |
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837 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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838 |
1705 | 839 // A DirtyCardQueueSet that is used to hold cards that contain |
840 // references into the current collection set. This is used to | |
841 // update the remembered sets of the regions in the collection | |
842 // set in the event of an evacuation failure. | |
843 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
844 { return _into_cset_dirty_card_queue_set; } | |
845 | |
342 | 846 // Create a G1CollectedHeap with the specified policy. |
847 // Must call the initialize method afterwards. | |
848 // May not return if something goes wrong. | |
849 G1CollectedHeap(G1CollectorPolicy* policy); | |
850 | |
851 // Initialize the G1CollectedHeap to have the initial and | |
852 // maximum sizes, permanent generation, and remembered and barrier sets | |
853 // specified by the policy object. | |
854 jint initialize(); | |
855 | |
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856 virtual void ref_processing_init(); |
342 | 857 |
858 void set_par_threads(int t) { | |
859 SharedHeap::set_par_threads(t); | |
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860 _process_strong_tasks->set_n_threads(t); |
342 | 861 } |
862 | |
863 virtual CollectedHeap::Name kind() const { | |
864 return CollectedHeap::G1CollectedHeap; | |
865 } | |
866 | |
867 // The current policy object for the collector. | |
868 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
869 | |
870 // Adaptive size policy. No such thing for g1. | |
871 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
872 | |
873 // The rem set and barrier set. | |
874 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
875 ModRefBarrierSet* mr_bs() const { return _mr_bs; } | |
876 | |
877 // The rem set iterator. | |
878 HeapRegionRemSetIterator* rem_set_iterator(int i) { | |
879 return _rem_set_iterator[i]; | |
880 } | |
881 | |
882 HeapRegionRemSetIterator* rem_set_iterator() { | |
883 return _rem_set_iterator[0]; | |
884 } | |
885 | |
886 unsigned get_gc_time_stamp() { | |
887 return _gc_time_stamp; | |
888 } | |
889 | |
890 void reset_gc_time_stamp() { | |
891 _gc_time_stamp = 0; | |
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892 OrderAccess::fence(); |
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893 } |
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894 |
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895 void increment_gc_time_stamp() { |
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896 ++_gc_time_stamp; |
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897 OrderAccess::fence(); |
342 | 898 } |
899 | |
1705 | 900 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
901 DirtyCardQueue* into_cset_dcq, | |
902 bool concurrent, int worker_i); | |
342 | 903 |
904 // The shared block offset table array. | |
905 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
906 | |
907 // Reference Processing accessor | |
908 ReferenceProcessor* ref_processor() { return _ref_processor; } | |
909 | |
910 virtual size_t capacity() const; | |
911 virtual size_t used() const; | |
846
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912 // This should be called when we're not holding the heap lock. The |
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913 // result might be a bit inaccurate. |
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914 size_t used_unlocked() const; |
342 | 915 size_t recalculate_used() const; |
916 #ifndef PRODUCT | |
917 size_t recalculate_used_regions() const; | |
918 #endif // PRODUCT | |
919 | |
920 // These virtual functions do the actual allocation. | |
921 // Some heaps may offer a contiguous region for shared non-blocking | |
922 // allocation, via inlined code (by exporting the address of the top and | |
923 // end fields defining the extent of the contiguous allocation region.) | |
924 // But G1CollectedHeap doesn't yet support this. | |
925 | |
926 // Return an estimate of the maximum allocation that could be performed | |
927 // without triggering any collection or expansion activity. In a | |
928 // generational collector, for example, this is probably the largest | |
929 // allocation that could be supported (without expansion) in the youngest | |
930 // generation. It is "unsafe" because no locks are taken; the result | |
931 // should be treated as an approximation, not a guarantee, for use in | |
932 // heuristic resizing decisions. | |
933 virtual size_t unsafe_max_alloc(); | |
934 | |
935 virtual bool is_maximal_no_gc() const { | |
936 return _g1_storage.uncommitted_size() == 0; | |
937 } | |
938 | |
939 // The total number of regions in the heap. | |
940 size_t n_regions(); | |
941 | |
942 // The number of regions that are completely free. | |
943 size_t max_regions(); | |
944 | |
945 // The number of regions that are completely free. | |
2152 | 946 size_t free_regions() { |
947 return _free_list.length(); | |
948 } | |
342 | 949 |
950 // The number of regions that are not completely free. | |
951 size_t used_regions() { return n_regions() - free_regions(); } | |
952 | |
953 // The number of regions available for "regular" expansion. | |
954 size_t expansion_regions() { return _expansion_regions; } | |
955 | |
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956 void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN; |
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957 void verify_dirty_young_regions() PRODUCT_RETURN; |
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958 |
2152 | 959 // verify_region_sets() performs verification over the region |
960 // lists. It will be compiled in the product code to be used when | |
961 // necessary (i.e., during heap verification). | |
962 void verify_region_sets(); | |
342 | 963 |
2152 | 964 // verify_region_sets_optional() is planted in the code for |
965 // list verification in non-product builds (and it can be enabled in | |
966 // product builds by definning HEAP_REGION_SET_FORCE_VERIFY to be 1). | |
967 #if HEAP_REGION_SET_FORCE_VERIFY | |
968 void verify_region_sets_optional() { | |
969 verify_region_sets(); | |
970 } | |
971 #else // HEAP_REGION_SET_FORCE_VERIFY | |
972 void verify_region_sets_optional() { } | |
973 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
342 | 974 |
2152 | 975 #ifdef ASSERT |
2361 | 976 bool is_on_master_free_list(HeapRegion* hr) { |
2152 | 977 return hr->containing_set() == &_free_list; |
978 } | |
342 | 979 |
2361 | 980 bool is_in_humongous_set(HeapRegion* hr) { |
2152 | 981 return hr->containing_set() == &_humongous_set; |
2361 | 982 } |
2152 | 983 #endif // ASSERT |
342 | 984 |
2152 | 985 // Wrapper for the region list operations that can be called from |
986 // methods outside this class. | |
342 | 987 |
2152 | 988 void secondary_free_list_add_as_tail(FreeRegionList* list) { |
989 _secondary_free_list.add_as_tail(list); | |
990 } | |
342 | 991 |
2152 | 992 void append_secondary_free_list() { |
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993 _free_list.add_as_head(&_secondary_free_list); |
2152 | 994 } |
342 | 995 |
2361 | 996 void append_secondary_free_list_if_not_empty_with_lock() { |
997 // If the secondary free list looks empty there's no reason to | |
998 // take the lock and then try to append it. | |
2152 | 999 if (!_secondary_free_list.is_empty()) { |
1000 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
1001 append_secondary_free_list(); | |
1002 } | |
1003 } | |
342 | 1004 |
2152 | 1005 void set_free_regions_coming(); |
1006 void reset_free_regions_coming(); | |
1007 bool free_regions_coming() { return _free_regions_coming; } | |
1008 void wait_while_free_regions_coming(); | |
342 | 1009 |
1010 // Perform a collection of the heap; intended for use in implementing | |
1011 // "System.gc". This probably implies as full a collection as the | |
1012 // "CollectedHeap" supports. | |
1013 virtual void collect(GCCause::Cause cause); | |
1014 | |
1015 // The same as above but assume that the caller holds the Heap_lock. | |
1016 void collect_locked(GCCause::Cause cause); | |
1017 | |
1018 // This interface assumes that it's being called by the | |
1019 // vm thread. It collects the heap assuming that the | |
1020 // heap lock is already held and that we are executing in | |
1021 // the context of the vm thread. | |
1022 virtual void collect_as_vm_thread(GCCause::Cause cause); | |
1023 | |
1024 // True iff a evacuation has failed in the most-recent collection. | |
1025 bool evacuation_failed() { return _evacuation_failed; } | |
1026 | |
2152 | 1027 // It will free a region if it has allocated objects in it that are |
1028 // all dead. It calls either free_region() or | |
1029 // free_humongous_region() depending on the type of the region that | |
1030 // is passed to it. | |
2173 | 1031 void free_region_if_empty(HeapRegion* hr, |
1032 size_t* pre_used, | |
1033 FreeRegionList* free_list, | |
1034 HumongousRegionSet* humongous_proxy_set, | |
1035 HRRSCleanupTask* hrrs_cleanup_task, | |
1036 bool par); | |
342 | 1037 |
2152 | 1038 // It appends the free list to the master free list and updates the |
1039 // master humongous list according to the contents of the proxy | |
1040 // list. It also adjusts the total used bytes according to pre_used | |
1041 // (if par is true, it will do so by taking the ParGCRareEvent_lock). | |
1042 void update_sets_after_freeing_regions(size_t pre_used, | |
1043 FreeRegionList* free_list, | |
1044 HumongousRegionSet* humongous_proxy_set, | |
1045 bool par); | |
342 | 1046 |
1047 // Returns "TRUE" iff "p" points into the allocated area of the heap. | |
1048 virtual bool is_in(const void* p) const; | |
1049 | |
1050 // Return "TRUE" iff the given object address is within the collection | |
1051 // set. | |
1052 inline bool obj_in_cs(oop obj); | |
1053 | |
1054 // Return "TRUE" iff the given object address is in the reserved | |
1055 // region of g1 (excluding the permanent generation). | |
1056 bool is_in_g1_reserved(const void* p) const { | |
1057 return _g1_reserved.contains(p); | |
1058 } | |
1059 | |
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1060 // Returns a MemRegion that corresponds to the space that has been |
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1061 // reserved for the heap |
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1062 MemRegion g1_reserved() { |
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1063 return _g1_reserved; |
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1064 } |
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1065 |
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1066 // Returns a MemRegion that corresponds to the space that has been |
342 | 1067 // committed in the heap |
1068 MemRegion g1_committed() { | |
1069 return _g1_committed; | |
1070 } | |
1071 | |
2311 | 1072 virtual bool is_in_closed_subset(const void* p) const; |
342 | 1073 |
1074 // Dirty card table entries covering a list of young regions. | |
1075 void dirtyCardsForYoungRegions(CardTableModRefBS* ct_bs, HeapRegion* list); | |
1076 | |
1077 // This resets the card table to all zeros. It is used after | |
1078 // a collection pause which used the card table to claim cards. | |
1079 void cleanUpCardTable(); | |
1080 | |
1081 // Iteration functions. | |
1082 | |
1083 // Iterate over all the ref-containing fields of all objects, calling | |
1084 // "cl.do_oop" on each. | |
678 | 1085 virtual void oop_iterate(OopClosure* cl) { |
1086 oop_iterate(cl, true); | |
1087 } | |
1088 void oop_iterate(OopClosure* cl, bool do_perm); | |
342 | 1089 |
1090 // Same as above, restricted to a memory region. | |
678 | 1091 virtual void oop_iterate(MemRegion mr, OopClosure* cl) { |
1092 oop_iterate(mr, cl, true); | |
1093 } | |
1094 void oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm); | |
342 | 1095 |
1096 // Iterate over all objects, calling "cl.do_object" on each. | |
678 | 1097 virtual void object_iterate(ObjectClosure* cl) { |
1098 object_iterate(cl, true); | |
1099 } | |
1100 virtual void safe_object_iterate(ObjectClosure* cl) { | |
1101 object_iterate(cl, true); | |
1102 } | |
1103 void object_iterate(ObjectClosure* cl, bool do_perm); | |
342 | 1104 |
1105 // Iterate over all objects allocated since the last collection, calling | |
1106 // "cl.do_object" on each. The heap must have been initialized properly | |
1107 // to support this function, or else this call will fail. | |
1108 virtual void object_iterate_since_last_GC(ObjectClosure* cl); | |
1109 | |
1110 // Iterate over all spaces in use in the heap, in ascending address order. | |
1111 virtual void space_iterate(SpaceClosure* cl); | |
1112 | |
1113 // Iterate over heap regions, in address order, terminating the | |
1114 // iteration early if the "doHeapRegion" method returns "true". | |
1115 void heap_region_iterate(HeapRegionClosure* blk); | |
1116 | |
1117 // Iterate over heap regions starting with r (or the first region if "r" | |
1118 // is NULL), in address order, terminating early if the "doHeapRegion" | |
1119 // method returns "true". | |
1120 void heap_region_iterate_from(HeapRegion* r, HeapRegionClosure* blk); | |
1121 | |
1122 // As above but starting from the region at index idx. | |
1123 void heap_region_iterate_from(int idx, HeapRegionClosure* blk); | |
1124 | |
1125 HeapRegion* region_at(size_t idx); | |
1126 | |
1127 // Divide the heap region sequence into "chunks" of some size (the number | |
1128 // of regions divided by the number of parallel threads times some | |
1129 // overpartition factor, currently 4). Assumes that this will be called | |
1130 // in parallel by ParallelGCThreads worker threads with discinct worker | |
1131 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
1132 // calls will use the same "claim_value", and that that claim value is | |
1133 // different from the claim_value of any heap region before the start of | |
1134 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
1135 // attempting to claim the first region in each chunk, and, if | |
1136 // successful, applying the closure to each region in the chunk (and | |
1137 // setting the claim value of the second and subsequent regions of the | |
1138 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
1139 // i.e., that a closure never attempt to abort a traversal. | |
1140 void heap_region_par_iterate_chunked(HeapRegionClosure* blk, | |
1141 int worker, | |
1142 jint claim_value); | |
1143 | |
390 | 1144 // It resets all the region claim values to the default. |
1145 void reset_heap_region_claim_values(); | |
1146 | |
355 | 1147 #ifdef ASSERT |
1148 bool check_heap_region_claim_values(jint claim_value); | |
1149 #endif // ASSERT | |
1150 | |
342 | 1151 // Iterate over the regions (if any) in the current collection set. |
1152 void collection_set_iterate(HeapRegionClosure* blk); | |
1153 | |
1154 // As above but starting from region r | |
1155 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
1156 | |
1157 // Returns the first (lowest address) compactible space in the heap. | |
1158 virtual CompactibleSpace* first_compactible_space(); | |
1159 | |
1160 // A CollectedHeap will contain some number of spaces. This finds the | |
1161 // space containing a given address, or else returns NULL. | |
1162 virtual Space* space_containing(const void* addr) const; | |
1163 | |
1164 // A G1CollectedHeap will contain some number of heap regions. This | |
1165 // finds the region containing a given address, or else returns NULL. | |
1166 HeapRegion* heap_region_containing(const void* addr) const; | |
1167 | |
1168 // Like the above, but requires "addr" to be in the heap (to avoid a | |
1169 // null-check), and unlike the above, may return an continuing humongous | |
1170 // region. | |
1171 HeapRegion* heap_region_containing_raw(const void* addr) const; | |
1172 | |
1173 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
1174 // each address in the (reserved) heap is a member of exactly | |
1175 // one block. The defining characteristic of a block is that it is | |
1176 // possible to find its size, and thus to progress forward to the next | |
1177 // block. (Blocks may be of different sizes.) Thus, blocks may | |
1178 // represent Java objects, or they might be free blocks in a | |
1179 // free-list-based heap (or subheap), as long as the two kinds are | |
1180 // distinguishable and the size of each is determinable. | |
1181 | |
1182 // Returns the address of the start of the "block" that contains the | |
1183 // address "addr". We say "blocks" instead of "object" since some heaps | |
1184 // may not pack objects densely; a chunk may either be an object or a | |
1185 // non-object. | |
1186 virtual HeapWord* block_start(const void* addr) const; | |
1187 | |
1188 // Requires "addr" to be the start of a chunk, and returns its size. | |
1189 // "addr + size" is required to be the start of a new chunk, or the end | |
1190 // of the active area of the heap. | |
1191 virtual size_t block_size(const HeapWord* addr) const; | |
1192 | |
1193 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
1194 // the block is an object. | |
1195 virtual bool block_is_obj(const HeapWord* addr) const; | |
1196 | |
1197 // Does this heap support heap inspection? (+PrintClassHistogram) | |
1198 virtual bool supports_heap_inspection() const { return true; } | |
1199 | |
1200 // Section on thread-local allocation buffers (TLABs) | |
1201 // See CollectedHeap for semantics. | |
1202 | |
1203 virtual bool supports_tlab_allocation() const; | |
1204 virtual size_t tlab_capacity(Thread* thr) const; | |
1205 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; | |
1206 | |
1207 // Can a compiler initialize a new object without store barriers? | |
1208 // This permission only extends from the creation of a new object | |
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1209 // via a TLAB up to the first subsequent safepoint. If such permission |
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1210 // is granted for this heap type, the compiler promises to call |
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1211 // defer_store_barrier() below on any slow path allocation of |
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1212 // a new object for which such initializing store barriers will |
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1213 // have been elided. G1, like CMS, allows this, but should be |
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1214 // ready to provide a compensating write barrier as necessary |
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1215 // if that storage came out of a non-young region. The efficiency |
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1216 // of this implementation depends crucially on being able to |
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1217 // answer very efficiently in constant time whether a piece of |
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1218 // storage in the heap comes from a young region or not. |
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1219 // See ReduceInitialCardMarks. |
342 | 1220 virtual bool can_elide_tlab_store_barriers() const { |
1194
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1221 // 6920090: Temporarily disabled, because of lingering |
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1222 // instabilities related to RICM with G1. In the |
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1223 // interim, the option ReduceInitialCardMarksForG1 |
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1224 // below is left solely as a debugging device at least |
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1225 // until 6920109 fixes the instabilities. |
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1226 return ReduceInitialCardMarksForG1; |
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1227 } |
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1228 |
1166 | 1229 virtual bool card_mark_must_follow_store() const { |
1230 return true; | |
1231 } | |
1232 | |
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1233 bool is_in_young(oop obj) { |
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1234 HeapRegion* hr = heap_region_containing(obj); |
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1235 return hr != NULL && hr->is_young(); |
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1236 } |
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1237 |
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1238 // We don't need barriers for initializing stores to objects |
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1239 // in the young gen: for the SATB pre-barrier, there is no |
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1240 // pre-value that needs to be remembered; for the remembered-set |
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1241 // update logging post-barrier, we don't maintain remembered set |
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1242 // information for young gen objects. Note that non-generational |
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1243 // G1 does not have any "young" objects, should not elide |
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1244 // the rs logging barrier and so should always answer false below. |
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1245 // However, non-generational G1 (-XX:-G1Gen) appears to have |
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1246 // bit-rotted so was not tested below. |
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1247 virtual bool can_elide_initializing_store_barrier(oop new_obj) { |
1194
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1248 // Re 6920090, 6920109 above. |
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1249 assert(ReduceInitialCardMarksForG1, "Else cannot be here"); |
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1250 assert(G1Gen || !is_in_young(new_obj), |
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1251 "Non-generational G1 should never return true below"); |
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1252 return is_in_young(new_obj); |
342 | 1253 } |
1254 | |
1255 // Can a compiler elide a store barrier when it writes | |
1256 // a permanent oop into the heap? Applies when the compiler | |
1257 // is storing x to the heap, where x->is_perm() is true. | |
1258 virtual bool can_elide_permanent_oop_store_barriers() const { | |
1259 // At least until perm gen collection is also G1-ified, at | |
1260 // which point this should return false. | |
1261 return true; | |
1262 } | |
1263 | |
1264 // The boundary between a "large" and "small" array of primitives, in | |
1265 // words. | |
1266 virtual size_t large_typearray_limit(); | |
1267 | |
1268 // Returns "true" iff the given word_size is "very large". | |
1269 static bool isHumongous(size_t word_size) { | |
1313
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1270 // Note this has to be strictly greater-than as the TLABs |
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1271 // are capped at the humongous thresold and we want to |
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1272 // ensure that we don't try to allocate a TLAB as |
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1273 // humongous and that we don't allocate a humongous |
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1274 // object in a TLAB. |
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1275 return word_size > _humongous_object_threshold_in_words; |
342 | 1276 } |
1277 | |
1278 // Update mod union table with the set of dirty cards. | |
1279 void updateModUnion(); | |
1280 | |
1281 // Set the mod union bits corresponding to the given memRegion. Note | |
1282 // that this is always a safe operation, since it doesn't clear any | |
1283 // bits. | |
1284 void markModUnionRange(MemRegion mr); | |
1285 | |
1286 // Records the fact that a marking phase is no longer in progress. | |
1287 void set_marking_complete() { | |
1288 _mark_in_progress = false; | |
1289 } | |
1290 void set_marking_started() { | |
1291 _mark_in_progress = true; | |
1292 } | |
1293 bool mark_in_progress() { | |
1294 return _mark_in_progress; | |
1295 } | |
1296 | |
1297 // Print the maximum heap capacity. | |
1298 virtual size_t max_capacity() const; | |
1299 | |
1300 virtual jlong millis_since_last_gc(); | |
1301 | |
1302 // Perform any cleanup actions necessary before allowing a verification. | |
1303 virtual void prepare_for_verify(); | |
1304 | |
1305 // Perform verification. | |
811 | 1306 |
1307 // use_prev_marking == true -> use "prev" marking information, | |
1308 // use_prev_marking == false -> use "next" marking information | |
1309 // NOTE: Only the "prev" marking information is guaranteed to be | |
1310 // consistent most of the time, so most calls to this should use | |
1311 // use_prev_marking == true. Currently, there is only one case where | |
1312 // this is called with use_prev_marking == false, which is to verify | |
1313 // the "next" marking information at the end of remark. | |
1314 void verify(bool allow_dirty, bool silent, bool use_prev_marking); | |
1315 | |
1316 // Override; it uses the "prev" marking information | |
342 | 1317 virtual void verify(bool allow_dirty, bool silent); |
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1318 // Default behavior by calling print(tty); |
342 | 1319 virtual void print() const; |
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1320 // This calls print_on(st, PrintHeapAtGCExtended). |
342 | 1321 virtual void print_on(outputStream* st) const; |
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1322 // If extended is true, it will print out information for all |
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1323 // regions in the heap by calling print_on_extended(st). |
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1324 virtual void print_on(outputStream* st, bool extended) const; |
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1325 virtual void print_on_extended(outputStream* st) const; |
342 | 1326 |
1327 virtual void print_gc_threads_on(outputStream* st) const; | |
1328 virtual void gc_threads_do(ThreadClosure* tc) const; | |
1329 | |
1330 // Override | |
1331 void print_tracing_info() const; | |
1332 | |
1333 // If "addr" is a pointer into the (reserved?) heap, returns a positive | |
1334 // number indicating the "arena" within the heap in which "addr" falls. | |
1335 // Or else returns 0. | |
1336 virtual int addr_to_arena_id(void* addr) const; | |
1337 | |
1338 // Convenience function to be used in situations where the heap type can be | |
1339 // asserted to be this type. | |
1340 static G1CollectedHeap* heap(); | |
1341 | |
1342 void empty_young_list(); | |
1343 | |
1344 void set_region_short_lived_locked(HeapRegion* hr); | |
1345 // add appropriate methods for any other surv rate groups | |
1346 | |
1394
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1347 YoungList* young_list() { return _young_list; } |
342 | 1348 |
1349 // debugging | |
1350 bool check_young_list_well_formed() { | |
1351 return _young_list->check_list_well_formed(); | |
1352 } | |
1394
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1353 |
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1354 bool check_young_list_empty(bool check_heap, |
342 | 1355 bool check_sample = true); |
1356 | |
1357 // *** Stuff related to concurrent marking. It's not clear to me that so | |
1358 // many of these need to be public. | |
1359 | |
1360 // The functions below are helper functions that a subclass of | |
1361 // "CollectedHeap" can use in the implementation of its virtual | |
1362 // functions. | |
1363 // This performs a concurrent marking of the live objects in a | |
1364 // bitmap off to the side. | |
1365 void doConcurrentMark(); | |
1366 | |
1367 // This is called from the marksweep collector which then does | |
1368 // a concurrent mark and verifies that the results agree with | |
1369 // the stop the world marking. | |
1370 void checkConcurrentMark(); | |
1371 void do_sync_mark(); | |
1372 | |
1373 bool isMarkedPrev(oop obj) const; | |
1374 bool isMarkedNext(oop obj) const; | |
1375 | |
811 | 1376 // use_prev_marking == true -> use "prev" marking information, |
1377 // use_prev_marking == false -> use "next" marking information | |
1378 bool is_obj_dead_cond(const oop obj, | |
1379 const HeapRegion* hr, | |
1380 const bool use_prev_marking) const { | |
1381 if (use_prev_marking) { | |
1382 return is_obj_dead(obj, hr); | |
1383 } else { | |
1384 return is_obj_ill(obj, hr); | |
1385 } | |
1386 } | |
1387 | |
342 | 1388 // Determine if an object is dead, given the object and also |
1389 // the region to which the object belongs. An object is dead | |
1390 // iff a) it was not allocated since the last mark and b) it | |
1391 // is not marked. | |
1392 | |
1393 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
1394 return | |
1395 !hr->obj_allocated_since_prev_marking(obj) && | |
1396 !isMarkedPrev(obj); | |
1397 } | |
1398 | |
1399 // This is used when copying an object to survivor space. | |
1400 // If the object is marked live, then we mark the copy live. | |
1401 // If the object is allocated since the start of this mark | |
1402 // cycle, then we mark the copy live. | |
1403 // If the object has been around since the previous mark | |
1404 // phase, and hasn't been marked yet during this phase, | |
1405 // then we don't mark it, we just wait for the | |
1406 // current marking cycle to get to it. | |
1407 | |
1408 // This function returns true when an object has been | |
1409 // around since the previous marking and hasn't yet | |
1410 // been marked during this marking. | |
1411 | |
1412 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
1413 return | |
1414 !hr->obj_allocated_since_next_marking(obj) && | |
1415 !isMarkedNext(obj); | |
1416 } | |
1417 | |
1418 // Determine if an object is dead, given only the object itself. | |
1419 // This will find the region to which the object belongs and | |
1420 // then call the region version of the same function. | |
1421 | |
1422 // Added if it is in permanent gen it isn't dead. | |
1423 // Added if it is NULL it isn't dead. | |
1424 | |
811 | 1425 // use_prev_marking == true -> use "prev" marking information, |
1426 // use_prev_marking == false -> use "next" marking information | |
1427 bool is_obj_dead_cond(const oop obj, | |
1428 const bool use_prev_marking) { | |
1429 if (use_prev_marking) { | |
1430 return is_obj_dead(obj); | |
1431 } else { | |
1432 return is_obj_ill(obj); | |
1433 } | |
1434 } | |
1435 | |
1436 bool is_obj_dead(const oop obj) { | |
1437 const HeapRegion* hr = heap_region_containing(obj); | |
342 | 1438 if (hr == NULL) { |
1439 if (Universe::heap()->is_in_permanent(obj)) | |
1440 return false; | |
1441 else if (obj == NULL) return false; | |
1442 else return true; | |
1443 } | |
1444 else return is_obj_dead(obj, hr); | |
1445 } | |
1446 | |
811 | 1447 bool is_obj_ill(const oop obj) { |
1448 const HeapRegion* hr = heap_region_containing(obj); | |
342 | 1449 if (hr == NULL) { |
1450 if (Universe::heap()->is_in_permanent(obj)) | |
1451 return false; | |
1452 else if (obj == NULL) return false; | |
1453 else return true; | |
1454 } | |
1455 else return is_obj_ill(obj, hr); | |
1456 } | |
1457 | |
1458 // The following is just to alert the verification code | |
1459 // that a full collection has occurred and that the | |
1460 // remembered sets are no longer up to date. | |
1461 bool _full_collection; | |
1462 void set_full_collection() { _full_collection = true;} | |
1463 void clear_full_collection() {_full_collection = false;} | |
1464 bool full_collection() {return _full_collection;} | |
1465 | |
1466 ConcurrentMark* concurrent_mark() const { return _cm; } | |
1467 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
1468 | |
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1469 // The dirty cards region list is used to record a subset of regions |
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1470 // whose cards need clearing. The list if populated during the |
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1471 // remembered set scanning and drained during the card table |
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1472 // cleanup. Although the methods are reentrant, population/draining |
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1473 // phases must not overlap. For synchronization purposes the last |
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1474 // element on the list points to itself. |
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1475 HeapRegion* _dirty_cards_region_list; |
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1476 void push_dirty_cards_region(HeapRegion* hr); |
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1477 HeapRegion* pop_dirty_cards_region(); |
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1478 |
342 | 1479 public: |
1480 void stop_conc_gc_threads(); | |
1481 | |
1482 // <NEW PREDICTION> | |
1483 | |
1484 double predict_region_elapsed_time_ms(HeapRegion* hr, bool young); | |
1485 void check_if_region_is_too_expensive(double predicted_time_ms); | |
1486 size_t pending_card_num(); | |
1487 size_t max_pending_card_num(); | |
1488 size_t cards_scanned(); | |
1489 | |
1490 // </NEW PREDICTION> | |
1491 | |
1492 protected: | |
1493 size_t _max_heap_capacity; | |
1494 }; | |
1495 | |
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1496 #define use_local_bitmaps 1 |
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1497 #define verify_local_bitmaps 0 |
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1498 #define oop_buffer_length 256 |
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1499 |
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1500 #ifndef PRODUCT |
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1501 class GCLabBitMap; |
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1502 class GCLabBitMapClosure: public BitMapClosure { |
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1503 private: |
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1504 ConcurrentMark* _cm; |
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1505 GCLabBitMap* _bitmap; |
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1506 |
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1507 public: |
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1508 GCLabBitMapClosure(ConcurrentMark* cm, |
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1509 GCLabBitMap* bitmap) { |
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1510 _cm = cm; |
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1511 _bitmap = bitmap; |
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1512 } |
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1513 |
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1514 virtual bool do_bit(size_t offset); |
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1515 }; |
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1516 #endif // !PRODUCT |
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1517 |
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1518 class GCLabBitMap: public BitMap { |
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1519 private: |
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1520 ConcurrentMark* _cm; |
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1521 |
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1522 int _shifter; |
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1523 size_t _bitmap_word_covers_words; |
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1524 |
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1525 // beginning of the heap |
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1526 HeapWord* _heap_start; |
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1527 |
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1528 // this is the actual start of the GCLab |
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1529 HeapWord* _real_start_word; |
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1530 |
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1531 // this is the actual end of the GCLab |
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1532 HeapWord* _real_end_word; |
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1533 |
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1534 // this is the first word, possibly located before the actual start |
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1535 // of the GCLab, that corresponds to the first bit of the bitmap |
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1536 HeapWord* _start_word; |
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1537 |
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1538 // size of a GCLab in words |
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1539 size_t _gclab_word_size; |
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1540 |
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1541 static int shifter() { |
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1542 return MinObjAlignment - 1; |
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1543 } |
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1544 |
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1545 // how many heap words does a single bitmap word corresponds to? |
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1546 static size_t bitmap_word_covers_words() { |
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1547 return BitsPerWord << shifter(); |
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1548 } |
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1549 |
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1550 size_t gclab_word_size() const { |
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1551 return _gclab_word_size; |
845
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1552 } |
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1553 |
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1554 // Calculates actual GCLab size in words |
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1555 size_t gclab_real_word_size() const { |
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1556 return bitmap_size_in_bits(pointer_delta(_real_end_word, _start_word)) |
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1557 / BitsPerWord; |
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1558 } |
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1559 |
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1560 static size_t bitmap_size_in_bits(size_t gclab_word_size) { |
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1561 size_t bits_in_bitmap = gclab_word_size >> shifter(); |
845
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1562 // We are going to ensure that the beginning of a word in this |
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1563 // bitmap also corresponds to the beginning of a word in the |
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1564 // global marking bitmap. To handle the case where a GCLab |
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1565 // starts from the middle of the bitmap, we need to add enough |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1566 // space (i.e. up to a bitmap word) to ensure that we have |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1567 // enough bits in the bitmap. |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1568 return bits_in_bitmap + BitsPerWord - 1; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1569 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1570 public: |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
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|
1571 GCLabBitMap(HeapWord* heap_start, size_t gclab_word_size) |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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1313
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|
1572 : BitMap(bitmap_size_in_bits(gclab_word_size)), |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1573 _cm(G1CollectedHeap::heap()->concurrent_mark()), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1574 _shifter(shifter()), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1575 _bitmap_word_covers_words(bitmap_word_covers_words()), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1576 _heap_start(heap_start), |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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|
1577 _gclab_word_size(gclab_word_size), |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1578 _real_start_word(NULL), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1579 _real_end_word(NULL), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1580 _start_word(NULL) |
df6caf649ff7
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parents:
838
diff
changeset
|
1581 { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1582 guarantee( size_in_words() >= bitmap_size_in_words(), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1583 "just making sure"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1584 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1585 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1586 inline unsigned heapWordToOffset(HeapWord* addr) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1587 unsigned offset = (unsigned) pointer_delta(addr, _start_word) >> _shifter; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1588 assert(offset < size(), "offset should be within bounds"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1589 return offset; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1590 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1591 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1592 inline HeapWord* offsetToHeapWord(size_t offset) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1593 HeapWord* addr = _start_word + (offset << _shifter); |
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6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
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|
1594 assert(_real_start_word <= addr && addr < _real_end_word, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1595 return addr; |
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parents:
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diff
changeset
|
1596 } |
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parents:
838
diff
changeset
|
1597 |
df6caf649ff7
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parents:
838
diff
changeset
|
1598 bool fields_well_formed() { |
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6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
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|
1599 bool ret1 = (_real_start_word == NULL) && |
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diff
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|
1600 (_real_end_word == NULL) && |
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parents:
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diff
changeset
|
1601 (_start_word == NULL); |
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parents:
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diff
changeset
|
1602 if (ret1) |
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parents:
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diff
changeset
|
1603 return true; |
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6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1604 |
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6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
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|
1605 bool ret2 = _real_start_word >= _start_word && |
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diff
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|
1606 _start_word < _real_end_word && |
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6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
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|
1607 (_real_start_word + _gclab_word_size) == _real_end_word && |
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6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1608 (_start_word + _gclab_word_size + _bitmap_word_covers_words) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1609 > _real_end_word; |
df6caf649ff7
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parents:
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diff
changeset
|
1610 return ret2; |
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parents:
838
diff
changeset
|
1611 } |
df6caf649ff7
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parents:
838
diff
changeset
|
1612 |
df6caf649ff7
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parents:
838
diff
changeset
|
1613 inline bool mark(HeapWord* addr) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1614 guarantee(use_local_bitmaps, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1615 assert(fields_well_formed(), "invariant"); |
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6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1616 |
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parents:
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diff
changeset
|
1617 if (addr >= _real_start_word && addr < _real_end_word) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1618 assert(!isMarked(addr), "should not have already been marked"); |
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parents:
838
diff
changeset
|
1619 |
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parents:
838
diff
changeset
|
1620 // first mark it on the bitmap |
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parents:
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diff
changeset
|
1621 at_put(heapWordToOffset(addr), true); |
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parents:
838
diff
changeset
|
1622 |
df6caf649ff7
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parents:
838
diff
changeset
|
1623 return true; |
df6caf649ff7
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parents:
838
diff
changeset
|
1624 } else { |
df6caf649ff7
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parents:
838
diff
changeset
|
1625 return false; |
df6caf649ff7
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ysr
parents:
838
diff
changeset
|
1626 } |
df6caf649ff7
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ysr
parents:
838
diff
changeset
|
1627 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1628 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1629 inline bool isMarked(HeapWord* addr) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1630 guarantee(use_local_bitmaps, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1631 assert(fields_well_formed(), "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1632 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1633 return at(heapWordToOffset(addr)); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1634 } |
df6caf649ff7
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ysr
parents:
838
diff
changeset
|
1635 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1636 void set_buffer(HeapWord* start) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1637 guarantee(use_local_bitmaps, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1638 clear(); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1639 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1640 assert(start != NULL, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1641 _real_start_word = start; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1642 _real_end_word = start + _gclab_word_size; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1643 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1644 size_t diff = |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1645 pointer_delta(start, _heap_start) % _bitmap_word_covers_words; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1646 _start_word = start - diff; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1647 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1648 assert(fields_well_formed(), "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1649 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1650 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1651 #ifndef PRODUCT |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1652 void verify() { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1653 // verify that the marks have been propagated |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1654 GCLabBitMapClosure cl(_cm, this); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1655 iterate(&cl); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1656 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1657 #endif // PRODUCT |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1658 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1659 void retire() { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1660 guarantee(use_local_bitmaps, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1661 assert(fields_well_formed(), "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1662 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1663 if (_start_word != NULL) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1664 CMBitMap* mark_bitmap = _cm->nextMarkBitMap(); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1665 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1666 // this means that the bitmap was set up for the GCLab |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1667 assert(_real_start_word != NULL && _real_end_word != NULL, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1668 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1669 mark_bitmap->mostly_disjoint_range_union(this, |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1670 0, // always start from the start of the bitmap |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1671 _start_word, |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1672 gclab_real_word_size()); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1673 _cm->grayRegionIfNecessary(MemRegion(_real_start_word, _real_end_word)); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1674 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1675 #ifndef PRODUCT |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1676 if (use_local_bitmaps && verify_local_bitmaps) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1677 verify(); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1678 #endif // PRODUCT |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1679 } else { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1680 assert(_real_start_word == NULL && _real_end_word == NULL, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1681 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1682 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1683 |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1684 size_t bitmap_size_in_words() const { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1685 return (bitmap_size_in_bits(gclab_word_size()) + BitsPerWord - 1) / BitsPerWord; |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1686 } |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1687 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1688 }; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1689 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1690 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1691 private: |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1692 bool _retired; |
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1693 bool _during_marking; |
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1694 GCLabBitMap _bitmap; |
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1695 |
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1696 public: |
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1697 G1ParGCAllocBuffer(size_t gclab_word_size) : |
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1698 ParGCAllocBuffer(gclab_word_size), |
845
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1699 _during_marking(G1CollectedHeap::heap()->mark_in_progress()), |
1391
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1700 _bitmap(G1CollectedHeap::heap()->reserved_region().start(), gclab_word_size), |
845
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1701 _retired(false) |
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1702 { } |
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1703 |
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1704 inline bool mark(HeapWord* addr) { |
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1705 guarantee(use_local_bitmaps, "invariant"); |
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1706 assert(_during_marking, "invariant"); |
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1707 return _bitmap.mark(addr); |
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1708 } |
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1709 |
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1710 inline void set_buf(HeapWord* buf) { |
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1711 if (use_local_bitmaps && _during_marking) |
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1712 _bitmap.set_buffer(buf); |
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1713 ParGCAllocBuffer::set_buf(buf); |
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1714 _retired = false; |
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1715 } |
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1716 |
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1717 inline void retire(bool end_of_gc, bool retain) { |
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1718 if (_retired) |
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1719 return; |
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1720 if (use_local_bitmaps && _during_marking) { |
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1721 _bitmap.retire(); |
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1722 } |
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1723 ParGCAllocBuffer::retire(end_of_gc, retain); |
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1724 _retired = true; |
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1725 } |
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1726 }; |
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1727 |
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1728 class G1ParScanThreadState : public StackObj { |
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1729 protected: |
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1730 G1CollectedHeap* _g1h; |
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1731 RefToScanQueue* _refs; |
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1732 DirtyCardQueue _dcq; |
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1733 CardTableModRefBS* _ct_bs; |
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1734 G1RemSet* _g1_rem; |
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1735 |
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1736 G1ParGCAllocBuffer _surviving_alloc_buffer; |
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1737 G1ParGCAllocBuffer _tenured_alloc_buffer; |
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1738 G1ParGCAllocBuffer* _alloc_buffers[GCAllocPurposeCount]; |
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1739 ageTable _age_table; |
845
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1740 |
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1741 size_t _alloc_buffer_waste; |
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1742 size_t _undo_waste; |
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1743 |
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1744 OopsInHeapRegionClosure* _evac_failure_cl; |
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1745 G1ParScanHeapEvacClosure* _evac_cl; |
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1746 G1ParScanPartialArrayClosure* _partial_scan_cl; |
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1747 |
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1748 int _hash_seed; |
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1749 int _queue_num; |
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1750 |
1611 | 1751 size_t _term_attempts; |
845
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1752 |
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1753 double _start; |
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1754 double _start_strong_roots; |
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|
1755 double _strong_roots_time; |
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|
1756 double _start_term; |
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|
1757 double _term_time; |
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1758 |
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1759 // Map from young-age-index (0 == not young, 1 is youngest) to |
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1760 // surviving words. base is what we get back from the malloc call |
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1761 size_t* _surviving_young_words_base; |
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1762 // this points into the array, as we use the first few entries for padding |
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1763 size_t* _surviving_young_words; |
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1764 |
1709 | 1765 #define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t)) |
845
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1766 |
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1767 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } |
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1768 |
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1769 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } |
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1770 |
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1771 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
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1772 CardTableModRefBS* ctbs() { return _ct_bs; } |
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1773 |
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1774 template <class T> void immediate_rs_update(HeapRegion* from, T* p, int tid) { |
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1775 if (!from->is_survivor()) { |
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1776 _g1_rem->par_write_ref(from, p, tid); |
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1777 } |
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1778 } |
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1779 |
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1780 template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) { |
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1781 // If the new value of the field points to the same region or |
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1782 // is the to-space, we don't need to include it in the Rset updates. |
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1783 if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) { |
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1784 size_t card_index = ctbs()->index_for(p); |
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1785 // If the card hasn't been added to the buffer, do it. |
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1786 if (ctbs()->mark_card_deferred(card_index)) { |
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1787 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
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1788 } |
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1789 } |
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1790 } |
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|
1791 |
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1792 public: |
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1793 G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num); |
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1794 |
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1795 ~G1ParScanThreadState() { |
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1796 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base); |
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1797 } |
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1798 |
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1799 RefToScanQueue* refs() { return _refs; } |
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1800 ageTable* age_table() { return &_age_table; } |
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1801 |
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1802 G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) { |
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1803 return _alloc_buffers[purpose]; |
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1804 } |
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1805 |
1709 | 1806 size_t alloc_buffer_waste() const { return _alloc_buffer_waste; } |
1807 size_t undo_waste() const { return _undo_waste; } | |
845
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1808 |
1862
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1809 #ifdef ASSERT |
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1810 bool verify_ref(narrowOop* ref) const; |
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1811 bool verify_ref(oop* ref) const; |
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1812 bool verify_task(StarTask ref) const; |
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1813 #endif // ASSERT |
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1814 |
845
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1815 template <class T> void push_on_queue(T* ref) { |
1862
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1816 assert(verify_ref(ref), "sanity"); |
1709 | 1817 refs()->push(ref); |
845
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1818 } |
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1819 |
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1820 template <class T> void update_rs(HeapRegion* from, T* p, int tid) { |
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1821 if (G1DeferredRSUpdate) { |
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1822 deferred_rs_update(from, p, tid); |
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1823 } else { |
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1824 immediate_rs_update(from, p, tid); |
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1825 } |
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1826 } |
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1827 |
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1828 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
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1829 |
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1830 HeapWord* obj = NULL; |
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1831 size_t gclab_word_size = _g1h->desired_plab_sz(purpose); |
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1832 if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) { |
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1833 G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose); |
1391
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1834 assert(gclab_word_size == alloc_buf->word_sz(), |
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1835 "dynamic resizing is not supported"); |
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1836 add_to_alloc_buffer_waste(alloc_buf->words_remaining()); |
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1837 alloc_buf->retire(false, false); |
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1838 |
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1839 HeapWord* buf = _g1h->par_allocate_during_gc(purpose, gclab_word_size); |
845
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1840 if (buf == NULL) return NULL; // Let caller handle allocation failure. |
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1841 // Otherwise. |
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1842 alloc_buf->set_buf(buf); |
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1843 |
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1844 obj = alloc_buf->allocate(word_sz); |
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1845 assert(obj != NULL, "buffer was definitely big enough..."); |
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1846 } else { |
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1847 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
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1848 } |
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1849 return obj; |
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1850 } |
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1851 |
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1852 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { |
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1853 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); |
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1854 if (obj != NULL) return obj; |
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1855 return allocate_slow(purpose, word_sz); |
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1856 } |
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1857 |
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1858 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { |
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1859 if (alloc_buffer(purpose)->contains(obj)) { |
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1860 assert(alloc_buffer(purpose)->contains(obj + word_sz - 1), |
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1861 "should contain whole object"); |
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1862 alloc_buffer(purpose)->undo_allocation(obj, word_sz); |
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1863 } else { |
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1864 CollectedHeap::fill_with_object(obj, word_sz); |
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1865 add_to_undo_waste(word_sz); |
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1866 } |
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1867 } |
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1868 |
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1869 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { |
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1870 _evac_failure_cl = evac_failure_cl; |
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1871 } |
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1872 OopsInHeapRegionClosure* evac_failure_closure() { |
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1873 return _evac_failure_cl; |
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1874 } |
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1875 |
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1876 void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) { |
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1877 _evac_cl = evac_cl; |
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1878 } |
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1879 |
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1880 void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) { |
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1881 _partial_scan_cl = partial_scan_cl; |
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1882 } |
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1883 |
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1884 int* hash_seed() { return &_hash_seed; } |
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1885 int queue_num() { return _queue_num; } |
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1886 |
1709 | 1887 size_t term_attempts() const { return _term_attempts; } |
1611 | 1888 void note_term_attempt() { _term_attempts++; } |
845
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1889 |
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1890 void start_strong_roots() { |
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1891 _start_strong_roots = os::elapsedTime(); |
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1892 } |
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1893 void end_strong_roots() { |
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1894 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); |
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1895 } |
1709 | 1896 double strong_roots_time() const { return _strong_roots_time; } |
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1897 |
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1898 void start_term_time() { |
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1899 note_term_attempt(); |
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1900 _start_term = os::elapsedTime(); |
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1901 } |
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1902 void end_term_time() { |
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1903 _term_time += (os::elapsedTime() - _start_term); |
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1904 } |
1709 | 1905 double term_time() const { return _term_time; } |
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1906 |
1709 | 1907 double elapsed_time() const { |
845
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1908 return os::elapsedTime() - _start; |
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1909 } |
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1910 |
1709 | 1911 static void |
1912 print_termination_stats_hdr(outputStream* const st = gclog_or_tty); | |
1913 void | |
1914 print_termination_stats(int i, outputStream* const st = gclog_or_tty) const; | |
1915 | |
845
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1916 size_t* surviving_young_words() { |
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1917 // We add on to hide entry 0 which accumulates surviving words for |
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1918 // age -1 regions (i.e. non-young ones) |
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1919 return _surviving_young_words; |
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1920 } |
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1921 |
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1922 void retire_alloc_buffers() { |
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1923 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
1391
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1924 size_t waste = _alloc_buffers[ap]->words_remaining(); |
845
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1925 add_to_alloc_buffer_waste(waste); |
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1926 _alloc_buffers[ap]->retire(true, false); |
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1927 } |
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1928 } |
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1929 |
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1930 template <class T> void deal_with_reference(T* ref_to_scan) { |
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1931 if (has_partial_array_mask(ref_to_scan)) { |
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1932 _partial_scan_cl->do_oop_nv(ref_to_scan); |
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1933 } else { |
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1934 // Note: we can use "raw" versions of "region_containing" because |
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1935 // "obj_to_scan" is definitely in the heap, and is not in a |
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1936 // humongous region. |
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1937 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); |
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1938 _evac_cl->set_region(r); |
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1939 _evac_cl->do_oop_nv(ref_to_scan); |
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1940 } |
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1941 } |
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1942 |
1862
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1943 void deal_with_reference(StarTask ref) { |
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1944 assert(verify_task(ref), "sanity"); |
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1945 if (ref.is_narrow()) { |
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1946 deal_with_reference((narrowOop*)ref); |
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1947 } else { |
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1948 deal_with_reference((oop*)ref); |
845
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1949 } |
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1950 } |
1862
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1951 |
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1952 public: |
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1953 void trim_queue(); |
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1954 }; |
1972 | 1955 |
1956 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |