Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 2037:b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
Summary: Initialize the _is_alive_non_header field of G1's reference processor with an instance of the G1CMIsAliveClosure. This will stop adding reference objects with live referents to the discovered reference lists unnecessarily.
Reviewed-by: tonyp, ysr, jwilhelm, brutisso
author | johnc |
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date | Fri, 17 Dec 2010 11:26:53 -0800 |
parents | fb712ff22571 |
children | 2250ee17e258 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2010, 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" | |
29 #include "gc_implementation/g1/g1RemSet.hpp" | |
30 #include "gc_implementation/g1/heapRegion.hpp" | |
31 #include "gc_implementation/parNew/parGCAllocBuffer.hpp" | |
32 #include "memory/barrierSet.hpp" | |
33 #include "memory/memRegion.hpp" | |
34 #include "memory/sharedHeap.hpp" | |
35 | |
342 | 36 // A "G1CollectedHeap" is an implementation of a java heap for HotSpot. |
37 // It uses the "Garbage First" heap organization and algorithm, which | |
38 // may combine concurrent marking with parallel, incremental compaction of | |
39 // heap subsets that will yield large amounts of garbage. | |
40 | |
41 class HeapRegion; | |
42 class HeapRegionSeq; | |
43 class PermanentGenerationSpec; | |
44 class GenerationSpec; | |
45 class OopsInHeapRegionClosure; | |
46 class G1ScanHeapEvacClosure; | |
47 class ObjectClosure; | |
48 class SpaceClosure; | |
49 class CompactibleSpaceClosure; | |
50 class Space; | |
51 class G1CollectorPolicy; | |
52 class GenRemSet; | |
53 class G1RemSet; | |
54 class HeapRegionRemSetIterator; | |
55 class ConcurrentMark; | |
56 class ConcurrentMarkThread; | |
57 class ConcurrentG1Refine; | |
58 class ConcurrentZFThread; | |
59 | |
1709 | 60 typedef OverflowTaskQueue<StarTask> RefToScanQueue; |
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61 typedef GenericTaskQueueSet<RefToScanQueue> RefToScanQueueSet; |
342 | 62 |
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63 typedef int RegionIdx_t; // needs to hold [ 0..max_regions() ) |
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64 typedef int CardIdx_t; // needs to hold [ 0..CardsPerRegion ) |
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65 |
342 | 66 enum G1GCThreadGroups { |
67 G1CRGroup = 0, | |
68 G1ZFGroup = 1, | |
69 G1CMGroup = 2, | |
70 G1CLGroup = 3 | |
71 }; | |
72 | |
73 enum GCAllocPurpose { | |
74 GCAllocForTenured, | |
75 GCAllocForSurvived, | |
76 GCAllocPurposeCount | |
77 }; | |
78 | |
79 class YoungList : public CHeapObj { | |
80 private: | |
81 G1CollectedHeap* _g1h; | |
82 | |
83 HeapRegion* _head; | |
84 | |
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85 HeapRegion* _survivor_head; |
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86 HeapRegion* _survivor_tail; |
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87 |
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88 HeapRegion* _curr; |
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89 |
342 | 90 size_t _length; |
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91 size_t _survivor_length; |
342 | 92 |
93 size_t _last_sampled_rs_lengths; | |
94 size_t _sampled_rs_lengths; | |
95 | |
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96 void empty_list(HeapRegion* list); |
342 | 97 |
98 public: | |
99 YoungList(G1CollectedHeap* g1h); | |
100 | |
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101 void push_region(HeapRegion* hr); |
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102 void add_survivor_region(HeapRegion* hr); |
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103 |
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104 void empty_list(); |
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105 bool is_empty() { return _length == 0; } |
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106 size_t length() { return _length; } |
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107 size_t survivor_length() { return _survivor_length; } |
342 | 108 |
109 void rs_length_sampling_init(); | |
110 bool rs_length_sampling_more(); | |
111 void rs_length_sampling_next(); | |
112 | |
113 void reset_sampled_info() { | |
114 _last_sampled_rs_lengths = 0; | |
115 } | |
116 size_t sampled_rs_lengths() { return _last_sampled_rs_lengths; } | |
117 | |
118 // for development purposes | |
119 void reset_auxilary_lists(); | |
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120 void clear() { _head = NULL; _length = 0; } |
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121 |
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122 void clear_survivors() { |
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123 _survivor_head = NULL; |
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124 _survivor_tail = NULL; |
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125 _survivor_length = 0; |
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126 } |
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127 |
342 | 128 HeapRegion* first_region() { return _head; } |
129 HeapRegion* first_survivor_region() { return _survivor_head; } | |
545 | 130 HeapRegion* last_survivor_region() { return _survivor_tail; } |
342 | 131 |
132 // debugging | |
133 bool check_list_well_formed(); | |
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134 bool check_list_empty(bool check_sample = true); |
342 | 135 void print(); |
136 }; | |
137 | |
138 class RefineCardTableEntryClosure; | |
139 class G1CollectedHeap : public SharedHeap { | |
140 friend class VM_G1CollectForAllocation; | |
141 friend class VM_GenCollectForPermanentAllocation; | |
142 friend class VM_G1CollectFull; | |
143 friend class VM_G1IncCollectionPause; | |
144 friend class VMStructs; | |
145 | |
146 // Closures used in implementation. | |
147 friend class G1ParCopyHelper; | |
148 friend class G1IsAliveClosure; | |
149 friend class G1EvacuateFollowersClosure; | |
150 friend class G1ParScanThreadState; | |
151 friend class G1ParScanClosureSuper; | |
152 friend class G1ParEvacuateFollowersClosure; | |
153 friend class G1ParTask; | |
154 friend class G1FreeGarbageRegionClosure; | |
155 friend class RefineCardTableEntryClosure; | |
156 friend class G1PrepareCompactClosure; | |
157 friend class RegionSorter; | |
158 friend class CountRCClosure; | |
159 friend class EvacPopObjClosure; | |
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160 friend class G1ParCleanupCTTask; |
342 | 161 |
162 // Other related classes. | |
163 friend class G1MarkSweep; | |
164 | |
165 private: | |
166 // The one and only G1CollectedHeap, so static functions can find it. | |
167 static G1CollectedHeap* _g1h; | |
168 | |
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169 static size_t _humongous_object_threshold_in_words; |
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170 |
342 | 171 // Storage for the G1 heap (excludes the permanent generation). |
172 VirtualSpace _g1_storage; | |
173 MemRegion _g1_reserved; | |
174 | |
175 // The part of _g1_storage that is currently committed. | |
176 MemRegion _g1_committed; | |
177 | |
178 // The maximum part of _g1_storage that has ever been committed. | |
179 MemRegion _g1_max_committed; | |
180 | |
181 // The number of regions that are completely free. | |
182 size_t _free_regions; | |
183 | |
184 // The number of regions we could create by expansion. | |
185 size_t _expansion_regions; | |
186 | |
187 // Return the number of free regions in the heap (by direct counting.) | |
188 size_t count_free_regions(); | |
189 // Return the number of free regions on the free and unclean lists. | |
190 size_t count_free_regions_list(); | |
191 | |
192 // The block offset table for the G1 heap. | |
193 G1BlockOffsetSharedArray* _bot_shared; | |
194 | |
195 // Move all of the regions off the free lists, then rebuild those free | |
196 // lists, before and after full GC. | |
197 void tear_down_region_lists(); | |
198 void rebuild_region_lists(); | |
199 // This sets all non-empty regions to need zero-fill (which they will if | |
200 // they are empty after full collection.) | |
201 void set_used_regions_to_need_zero_fill(); | |
202 | |
203 // The sequence of all heap regions in the heap. | |
204 HeapRegionSeq* _hrs; | |
205 | |
206 // The region from which normal-sized objects are currently being | |
207 // allocated. May be NULL. | |
208 HeapRegion* _cur_alloc_region; | |
209 | |
210 // Postcondition: cur_alloc_region == NULL. | |
211 void abandon_cur_alloc_region(); | |
636 | 212 void abandon_gc_alloc_regions(); |
342 | 213 |
214 // The to-space memory regions into which objects are being copied during | |
215 // a GC. | |
216 HeapRegion* _gc_alloc_regions[GCAllocPurposeCount]; | |
545 | 217 size_t _gc_alloc_region_counts[GCAllocPurposeCount]; |
636 | 218 // These are the regions, one per GCAllocPurpose, that are half-full |
219 // at the end of a collection and that we want to reuse during the | |
220 // next collection. | |
221 HeapRegion* _retained_gc_alloc_regions[GCAllocPurposeCount]; | |
222 // This specifies whether we will keep the last half-full region at | |
223 // the end of a collection so that it can be reused during the next | |
224 // collection (this is specified per GCAllocPurpose) | |
225 bool _retain_gc_alloc_region[GCAllocPurposeCount]; | |
342 | 226 |
227 // A list of the regions that have been set to be alloc regions in the | |
228 // current collection. | |
229 HeapRegion* _gc_alloc_region_list; | |
230 | |
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231 // Determines PLAB size for a particular allocation purpose. |
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232 static size_t desired_plab_sz(GCAllocPurpose purpose); |
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233 |
342 | 234 // When called by par thread, require par_alloc_during_gc_lock() to be held. |
235 void push_gc_alloc_region(HeapRegion* hr); | |
236 | |
237 // This should only be called single-threaded. Undeclares all GC alloc | |
238 // regions. | |
239 void forget_alloc_region_list(); | |
240 | |
241 // Should be used to set an alloc region, because there's other | |
242 // associated bookkeeping. | |
243 void set_gc_alloc_region(int purpose, HeapRegion* r); | |
244 | |
245 // Check well-formedness of alloc region list. | |
246 bool check_gc_alloc_regions(); | |
247 | |
248 // Outside of GC pauses, the number of bytes used in all regions other | |
249 // than the current allocation region. | |
250 size_t _summary_bytes_used; | |
251 | |
526 | 252 // This is used for a quick test on whether a reference points into |
253 // the collection set or not. Basically, we have an array, with one | |
254 // byte per region, and that byte denotes whether the corresponding | |
255 // region is in the collection set or not. The entry corresponding | |
256 // the bottom of the heap, i.e., region 0, is pointed to by | |
257 // _in_cset_fast_test_base. The _in_cset_fast_test field has been | |
258 // biased so that it actually points to address 0 of the address | |
259 // space, to make the test as fast as possible (we can simply shift | |
260 // the address to address into it, instead of having to subtract the | |
261 // bottom of the heap from the address before shifting it; basically | |
262 // it works in the same way the card table works). | |
263 bool* _in_cset_fast_test; | |
264 | |
265 // The allocated array used for the fast test on whether a reference | |
266 // points into the collection set or not. This field is also used to | |
267 // free the array. | |
268 bool* _in_cset_fast_test_base; | |
269 | |
270 // The length of the _in_cset_fast_test_base array. | |
271 size_t _in_cset_fast_test_length; | |
272 | |
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273 volatile unsigned _gc_time_stamp; |
342 | 274 |
275 size_t* _surviving_young_words; | |
276 | |
277 void setup_surviving_young_words(); | |
278 void update_surviving_young_words(size_t* surv_young_words); | |
279 void cleanup_surviving_young_words(); | |
280 | |
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281 // It decides whether an explicit GC should start a concurrent cycle |
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282 // instead of doing a STW GC. Currently, a concurrent cycle is |
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283 // explicitly started if: |
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284 // (a) cause == _gc_locker and +GCLockerInvokesConcurrent, or |
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285 // (b) cause == _java_lang_system_gc and +ExplicitGCInvokesConcurrent. |
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286 bool should_do_concurrent_full_gc(GCCause::Cause cause); |
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287 |
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288 // Keeps track of how many "full collections" (i.e., Full GCs or |
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289 // concurrent cycles) we have completed. The number of them we have |
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290 // started is maintained in _total_full_collections in CollectedHeap. |
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291 volatile unsigned int _full_collections_completed; |
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292 |
1973 | 293 // These are macros so that, if the assert fires, we get the correct |
294 // line number, file, etc. | |
295 | |
296 #define heap_locking_asserts_err_msg(__extra_message) \ | |
297 err_msg("%s : Heap_lock %slocked, %sat a safepoint", \ | |
298 (__extra_message), \ | |
299 (!Heap_lock->owned_by_self()) ? "NOT " : "", \ | |
300 (!SafepointSynchronize::is_at_safepoint()) ? "NOT " : "") | |
301 | |
302 #define assert_heap_locked() \ | |
303 do { \ | |
304 assert(Heap_lock->owned_by_self(), \ | |
305 heap_locking_asserts_err_msg("should be holding the Heap_lock")); \ | |
306 } while (0) | |
307 | |
308 #define assert_heap_locked_or_at_safepoint() \ | |
309 do { \ | |
310 assert(Heap_lock->owned_by_self() || \ | |
311 SafepointSynchronize::is_at_safepoint(), \ | |
312 heap_locking_asserts_err_msg("should be holding the Heap_lock or " \ | |
313 "should be at a safepoint")); \ | |
314 } while (0) | |
315 | |
316 #define assert_heap_locked_and_not_at_safepoint() \ | |
317 do { \ | |
318 assert(Heap_lock->owned_by_self() && \ | |
319 !SafepointSynchronize::is_at_safepoint(), \ | |
320 heap_locking_asserts_err_msg("should be holding the Heap_lock and " \ | |
321 "should not be at a safepoint")); \ | |
322 } while (0) | |
323 | |
324 #define assert_heap_not_locked() \ | |
325 do { \ | |
326 assert(!Heap_lock->owned_by_self(), \ | |
327 heap_locking_asserts_err_msg("should not be holding the Heap_lock")); \ | |
328 } while (0) | |
329 | |
330 #define assert_heap_not_locked_and_not_at_safepoint() \ | |
331 do { \ | |
332 assert(!Heap_lock->owned_by_self() && \ | |
333 !SafepointSynchronize::is_at_safepoint(), \ | |
334 heap_locking_asserts_err_msg("should not be holding the Heap_lock and " \ | |
335 "should not be at a safepoint")); \ | |
336 } while (0) | |
337 | |
338 #define assert_at_safepoint() \ | |
339 do { \ | |
340 assert(SafepointSynchronize::is_at_safepoint(), \ | |
341 heap_locking_asserts_err_msg("should be at a safepoint")); \ | |
342 } while (0) | |
343 | |
344 #define assert_not_at_safepoint() \ | |
345 do { \ | |
346 assert(!SafepointSynchronize::is_at_safepoint(), \ | |
347 heap_locking_asserts_err_msg("should not be at a safepoint")); \ | |
348 } while (0) | |
349 | |
342 | 350 protected: |
351 | |
352 // Returns "true" iff none of the gc alloc regions have any allocations | |
353 // since the last call to "save_marks". | |
354 bool all_alloc_regions_no_allocs_since_save_marks(); | |
545 | 355 // Perform finalization stuff on all allocation regions. |
356 void retire_all_alloc_regions(); | |
342 | 357 |
358 // The number of regions allocated to hold humongous objects. | |
359 int _num_humongous_regions; | |
360 YoungList* _young_list; | |
361 | |
362 // The current policy object for the collector. | |
363 G1CollectorPolicy* _g1_policy; | |
364 | |
365 // Parallel allocation lock to protect the current allocation region. | |
366 Mutex _par_alloc_during_gc_lock; | |
367 Mutex* par_alloc_during_gc_lock() { return &_par_alloc_during_gc_lock; } | |
368 | |
369 // If possible/desirable, allocate a new HeapRegion for normal object | |
370 // allocation sufficient for an allocation of the given "word_size". | |
371 // If "do_expand" is true, will attempt to expand the heap if necessary | |
372 // to to satisfy the request. If "zero_filled" is true, requires a | |
373 // zero-filled region. | |
374 // (Returning NULL will trigger a GC.) | |
375 virtual HeapRegion* newAllocRegion_work(size_t word_size, | |
376 bool do_expand, | |
377 bool zero_filled); | |
378 | |
379 virtual HeapRegion* newAllocRegion(size_t word_size, | |
380 bool zero_filled = true) { | |
381 return newAllocRegion_work(word_size, false, zero_filled); | |
382 } | |
383 virtual HeapRegion* newAllocRegionWithExpansion(int purpose, | |
384 size_t word_size, | |
385 bool zero_filled = true); | |
386 | |
387 // Attempt to allocate an object of the given (very large) "word_size". | |
388 // Returns "NULL" on failure. | |
1973 | 389 virtual HeapWord* humongous_obj_allocate(size_t word_size); |
390 | |
391 // The following two methods, allocate_new_tlab() and | |
392 // mem_allocate(), are the two main entry points from the runtime | |
393 // into the G1's allocation routines. They have the following | |
394 // assumptions: | |
395 // | |
396 // * They should both be called outside safepoints. | |
397 // | |
398 // * They should both be called without holding the Heap_lock. | |
399 // | |
400 // * All allocation requests for new TLABs should go to | |
401 // allocate_new_tlab(). | |
402 // | |
403 // * All non-TLAB allocation requests should go to mem_allocate() | |
404 // and mem_allocate() should never be called with is_tlab == true. | |
405 // | |
406 // * If the GC locker is active we currently stall until we can | |
407 // allocate a new young region. This will be changed in the | |
408 // near future (see CR 6994056). | |
409 // | |
410 // * If either call cannot satisfy the allocation request using the | |
411 // current allocating region, they will try to get a new one. If | |
412 // this fails, they will attempt to do an evacuation pause and | |
413 // retry the allocation. | |
414 // | |
415 // * If all allocation attempts fail, even after trying to schedule | |
416 // an evacuation pause, allocate_new_tlab() will return NULL, | |
417 // whereas mem_allocate() will attempt a heap expansion and/or | |
418 // schedule a Full GC. | |
419 // | |
420 // * We do not allow humongous-sized TLABs. So, allocate_new_tlab | |
421 // should never be called with word_size being humongous. All | |
422 // humongous allocation requests should go to mem_allocate() which | |
423 // will satisfy them with a special path. | |
424 | |
425 virtual HeapWord* allocate_new_tlab(size_t word_size); | |
426 | |
427 virtual HeapWord* mem_allocate(size_t word_size, | |
428 bool is_noref, | |
429 bool is_tlab, /* expected to be false */ | |
430 bool* gc_overhead_limit_was_exceeded); | |
342 | 431 |
1973 | 432 // The following methods, allocate_from_cur_allocation_region(), |
433 // attempt_allocation(), replace_cur_alloc_region_and_allocate(), | |
434 // attempt_allocation_slow(), and attempt_allocation_humongous() | |
435 // have very awkward pre- and post-conditions with respect to | |
436 // locking: | |
437 // | |
438 // If they are called outside a safepoint they assume the caller | |
439 // holds the Heap_lock when it calls them. However, on exit they | |
440 // will release the Heap_lock if they return a non-NULL result, but | |
441 // keep holding the Heap_lock if they return a NULL result. The | |
442 // reason for this is that we need to dirty the cards that span | |
443 // allocated blocks on young regions to avoid having to take the | |
444 // slow path of the write barrier (for performance reasons we don't | |
445 // update RSets for references whose source is a young region, so we | |
446 // don't need to look at dirty cards on young regions). But, doing | |
447 // this card dirtying while holding the Heap_lock can be a | |
448 // scalability bottleneck, especially given that some allocation | |
449 // requests might be of non-trivial size (and the larger the region | |
450 // size is, the fewer allocations requests will be considered | |
451 // humongous, as the humongous size limit is a fraction of the | |
452 // region size). So, when one of these calls succeeds in allocating | |
453 // a block it does the card dirtying after it releases the Heap_lock | |
454 // which is why it will return without holding it. | |
455 // | |
456 // The above assymetry is the reason why locking / unlocking is done | |
457 // explicitly (i.e., with Heap_lock->lock() and | |
458 // Heap_lock->unlocked()) instead of using MutexLocker and | |
459 // MutexUnlocker objects. The latter would ensure that the lock is | |
460 // unlocked / re-locked at every possible exit out of the basic | |
461 // block. However, we only want that action to happen in selected | |
462 // places. | |
463 // | |
464 // Further, if the above methods are called during a safepoint, then | |
465 // naturally there's no assumption about the Heap_lock being held or | |
466 // there's no attempt to unlock it. The parameter at_safepoint | |
467 // indicates whether the call is made during a safepoint or not (as | |
468 // an optimization, to avoid reading the global flag with | |
469 // SafepointSynchronize::is_at_safepoint()). | |
470 // | |
471 // The methods share these parameters: | |
472 // | |
473 // * word_size : the size of the allocation request in words | |
474 // * at_safepoint : whether the call is done at a safepoint; this | |
475 // also determines whether a GC is permitted | |
476 // (at_safepoint == false) or not (at_safepoint == true) | |
477 // * do_dirtying : whether the method should dirty the allocated | |
478 // block before returning | |
479 // | |
480 // They all return either the address of the block, if they | |
481 // successfully manage to allocate it, or NULL. | |
342 | 482 |
1973 | 483 // It tries to satisfy an allocation request out of the current |
484 // allocating region, which is passed as a parameter. It assumes | |
485 // that the caller has checked that the current allocating region is | |
486 // not NULL. Given that the caller has to check the current | |
487 // allocating region for at least NULL, it might as well pass it as | |
488 // the first parameter so that the method doesn't have to read it | |
489 // from the _cur_alloc_region field again. | |
490 inline HeapWord* allocate_from_cur_alloc_region(HeapRegion* cur_alloc_region, | |
491 size_t word_size); | |
492 | |
493 // It attempts to allocate out of the current alloc region. If that | |
494 // fails, it retires the current alloc region (if there is one), | |
495 // tries to get a new one and retries the allocation. | |
496 inline HeapWord* attempt_allocation(size_t word_size); | |
497 | |
498 // It assumes that the current alloc region has been retired and | |
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499 // tries to allocate a new one. If it's successful, it performs the |
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500 // allocation out of the new current alloc region and updates |
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501 // _cur_alloc_region. Normally, it would try to allocate a new |
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502 // region if the young gen is not full, unless can_expand is true in |
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503 // which case it would always try to allocate a new region. |
1973 | 504 HeapWord* replace_cur_alloc_region_and_allocate(size_t word_size, |
505 bool at_safepoint, | |
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506 bool do_dirtying, |
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507 bool can_expand); |
1973 | 508 |
509 // The slow path when we are unable to allocate a new current alloc | |
510 // region to satisfy an allocation request (i.e., when | |
511 // attempt_allocation() fails). It will try to do an evacuation | |
512 // pause, which might stall due to the GC locker, and retry the | |
513 // allocation attempt when appropriate. | |
514 HeapWord* attempt_allocation_slow(size_t word_size); | |
515 | |
516 // The method that tries to satisfy a humongous allocation | |
517 // request. If it cannot satisfy it it will try to do an evacuation | |
518 // pause to perhaps reclaim enough space to be able to satisfy the | |
519 // allocation request afterwards. | |
520 HeapWord* attempt_allocation_humongous(size_t word_size, | |
521 bool at_safepoint); | |
522 | |
523 // It does the common work when we are retiring the current alloc region. | |
524 inline void retire_cur_alloc_region_common(HeapRegion* cur_alloc_region); | |
525 | |
526 // It retires the current alloc region, which is passed as a | |
527 // parameter (since, typically, the caller is already holding on to | |
528 // it). It sets _cur_alloc_region to NULL. | |
529 void retire_cur_alloc_region(HeapRegion* cur_alloc_region); | |
530 | |
531 // It attempts to do an allocation immediately before or after an | |
532 // evacuation pause and can only be called by the VM thread. It has | |
533 // slightly different assumptions that the ones before (i.e., | |
534 // assumes that the current alloc region has been retired). | |
535 HeapWord* attempt_allocation_at_safepoint(size_t word_size, | |
536 bool expect_null_cur_alloc_region); | |
537 | |
538 // It dirties the cards that cover the block so that so that the post | |
539 // write barrier never queues anything when updating objects on this | |
540 // block. It is assumed (and in fact we assert) that the block | |
541 // belongs to a young region. | |
542 inline void dirty_young_block(HeapWord* start, size_t word_size); | |
342 | 543 |
544 // Allocate blocks during garbage collection. Will ensure an | |
545 // allocation region, either by picking one or expanding the | |
546 // heap, and then allocate a block of the given size. The block | |
547 // may not be a humongous - it must fit into a single heap region. | |
548 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
549 | |
550 HeapWord* allocate_during_gc_slow(GCAllocPurpose purpose, | |
551 HeapRegion* alloc_region, | |
552 bool par, | |
553 size_t word_size); | |
554 | |
555 // Ensure that no further allocations can happen in "r", bearing in mind | |
556 // that parallel threads might be attempting allocations. | |
557 void par_allocate_remaining_space(HeapRegion* r); | |
558 | |
545 | 559 // Retires an allocation region when it is full or at the end of a |
560 // GC pause. | |
561 void retire_alloc_region(HeapRegion* alloc_region, bool par); | |
562 | |
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563 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
1973 | 564 // inspection request and should collect the entire heap |
565 // - if clear_all_soft_refs is true, all soft references should be | |
566 // cleared during the GC | |
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567 // - if explicit_gc is false, word_size describes the allocation that |
1973 | 568 // the GC should attempt (at least) to satisfy |
569 // - it returns false if it is unable to do the collection due to the | |
570 // GC locker being active, true otherwise | |
571 bool do_collection(bool explicit_gc, | |
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572 bool clear_all_soft_refs, |
342 | 573 size_t word_size); |
574 | |
575 // Callback from VM_G1CollectFull operation. | |
576 // Perform a full collection. | |
577 void do_full_collection(bool clear_all_soft_refs); | |
578 | |
579 // Resize the heap if necessary after a full collection. If this is | |
580 // after a collect-for allocation, "word_size" is the allocation size, | |
581 // and will be considered part of the used portion of the heap. | |
582 void resize_if_necessary_after_full_collection(size_t word_size); | |
583 | |
584 // Callback from VM_G1CollectForAllocation operation. | |
585 // This function does everything necessary/possible to satisfy a | |
586 // failed allocation request (including collection, expansion, etc.) | |
1973 | 587 HeapWord* satisfy_failed_allocation(size_t word_size, bool* succeeded); |
342 | 588 |
589 // Attempting to expand the heap sufficiently | |
590 // to support an allocation of the given "word_size". If | |
591 // successful, perform the allocation and return the address of the | |
592 // allocated block, or else "NULL". | |
1973 | 593 HeapWord* expand_and_allocate(size_t word_size); |
342 | 594 |
595 public: | |
596 // Expand the garbage-first heap by at least the given size (in bytes!). | |
597 // (Rounds up to a HeapRegion boundary.) | |
598 virtual void expand(size_t expand_bytes); | |
599 | |
600 // Do anything common to GC's. | |
601 virtual void gc_prologue(bool full); | |
602 virtual void gc_epilogue(bool full); | |
603 | |
526 | 604 // We register a region with the fast "in collection set" test. We |
605 // simply set to true the array slot corresponding to this region. | |
606 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
607 assert(_in_cset_fast_test_base != NULL, "sanity"); | |
608 assert(r->in_collection_set(), "invariant"); | |
609 int index = r->hrs_index(); | |
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610 assert(0 <= index && (size_t) index < _in_cset_fast_test_length, "invariant"); |
526 | 611 assert(!_in_cset_fast_test_base[index], "invariant"); |
612 _in_cset_fast_test_base[index] = true; | |
613 } | |
614 | |
615 // This is a fast test on whether a reference points into the | |
616 // collection set or not. It does not assume that the reference | |
617 // points into the heap; if it doesn't, it will return false. | |
618 bool in_cset_fast_test(oop obj) { | |
619 assert(_in_cset_fast_test != NULL, "sanity"); | |
620 if (_g1_committed.contains((HeapWord*) obj)) { | |
621 // no need to subtract the bottom of the heap from obj, | |
622 // _in_cset_fast_test is biased | |
623 size_t index = ((size_t) obj) >> HeapRegion::LogOfHRGrainBytes; | |
624 bool ret = _in_cset_fast_test[index]; | |
625 // let's make sure the result is consistent with what the slower | |
626 // test returns | |
627 assert( ret || !obj_in_cs(obj), "sanity"); | |
628 assert(!ret || obj_in_cs(obj), "sanity"); | |
629 return ret; | |
630 } else { | |
631 return false; | |
632 } | |
633 } | |
634 | |
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635 void clear_cset_fast_test() { |
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636 assert(_in_cset_fast_test_base != NULL, "sanity"); |
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637 memset(_in_cset_fast_test_base, false, |
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638 _in_cset_fast_test_length * sizeof(bool)); |
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639 } |
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640 |
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641 // This is called at the end of either a concurrent cycle or a Full |
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642 // GC to update the number of full collections completed. Those two |
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643 // can happen in a nested fashion, i.e., we start a concurrent |
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644 // cycle, a Full GC happens half-way through it which ends first, |
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645 // and then the cycle notices that a Full GC happened and ends |
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646 // too. The concurrent parameter is a boolean to help us do a bit |
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647 // tighter consistency checking in the method. If concurrent is |
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648 // false, the caller is the inner caller in the nesting (i.e., the |
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649 // Full GC). If concurrent is true, the caller is the outer caller |
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650 // in this nesting (i.e., the concurrent cycle). Further nesting is |
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651 // not currently supported. The end of the this call also notifies |
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652 // the FullGCCount_lock in case a Java thread is waiting for a full |
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653 // GC to happen (e.g., it called System.gc() with |
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654 // +ExplicitGCInvokesConcurrent). |
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655 void increment_full_collections_completed(bool concurrent); |
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656 |
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657 unsigned int full_collections_completed() { |
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658 return _full_collections_completed; |
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659 } |
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660 |
342 | 661 protected: |
662 | |
663 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
664 // (Rounds down to a HeapRegion boundary.) | |
665 virtual void shrink(size_t expand_bytes); | |
666 void shrink_helper(size_t expand_bytes); | |
667 | |
1709 | 668 #if TASKQUEUE_STATS |
669 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
670 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; | |
671 void reset_taskqueue_stats(); | |
672 #endif // TASKQUEUE_STATS | |
673 | |
1973 | 674 // Schedule the VM operation that will do an evacuation pause to |
675 // satisfy an allocation request of word_size. *succeeded will | |
676 // return whether the VM operation was successful (it did do an | |
677 // evacuation pause) or not (another thread beat us to it or the GC | |
678 // locker was active). Given that we should not be holding the | |
679 // Heap_lock when we enter this method, we will pass the | |
680 // gc_count_before (i.e., total_collections()) as a parameter since | |
681 // it has to be read while holding the Heap_lock. Currently, both | |
682 // methods that call do_collection_pause() release the Heap_lock | |
683 // before the call, so it's easy to read gc_count_before just before. | |
684 HeapWord* do_collection_pause(size_t word_size, | |
685 unsigned int gc_count_before, | |
686 bool* succeeded); | |
342 | 687 |
688 // The guts of the incremental collection pause, executed by the vm | |
1973 | 689 // thread. It returns false if it is unable to do the collection due |
690 // to the GC locker being active, true otherwise | |
691 bool do_collection_pause_at_safepoint(double target_pause_time_ms); | |
342 | 692 |
693 // Actually do the work of evacuating the collection set. | |
1973 | 694 void evacuate_collection_set(); |
342 | 695 |
696 // The g1 remembered set of the heap. | |
697 G1RemSet* _g1_rem_set; | |
698 // And it's mod ref barrier set, used to track updates for the above. | |
699 ModRefBarrierSet* _mr_bs; | |
700 | |
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701 // A set of cards that cover the objects for which the Rsets should be updated |
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702 // concurrently after the collection. |
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703 DirtyCardQueueSet _dirty_card_queue_set; |
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704 |
342 | 705 // The Heap Region Rem Set Iterator. |
706 HeapRegionRemSetIterator** _rem_set_iterator; | |
707 | |
708 // The closure used to refine a single card. | |
709 RefineCardTableEntryClosure* _refine_cte_cl; | |
710 | |
711 // A function to check the consistency of dirty card logs. | |
712 void check_ct_logs_at_safepoint(); | |
713 | |
1705 | 714 // A DirtyCardQueueSet that is used to hold cards that contain |
715 // references into the current collection set. This is used to | |
716 // update the remembered sets of the regions in the collection | |
717 // set in the event of an evacuation failure. | |
718 DirtyCardQueueSet _into_cset_dirty_card_queue_set; | |
719 | |
342 | 720 // After a collection pause, make the regions in the CS into free |
721 // regions. | |
722 void free_collection_set(HeapRegion* cs_head); | |
723 | |
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724 // Abandon the current collection set without recording policy |
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725 // statistics or updating free lists. |
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726 void abandon_collection_set(HeapRegion* cs_head); |
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727 |
342 | 728 // Applies "scan_non_heap_roots" to roots outside the heap, |
729 // "scan_rs" to roots inside the heap (having done "set_region" to | |
730 // indicate the region in which the root resides), and does "scan_perm" | |
731 // (setting the generation to the perm generation.) If "scan_rs" is | |
732 // NULL, then this step is skipped. The "worker_i" | |
733 // param is for use with parallel roots processing, and should be | |
734 // the "i" of the calling parallel worker thread's work(i) function. | |
735 // In the sequential case this param will be ignored. | |
736 void g1_process_strong_roots(bool collecting_perm_gen, | |
737 SharedHeap::ScanningOption so, | |
738 OopClosure* scan_non_heap_roots, | |
739 OopsInHeapRegionClosure* scan_rs, | |
740 OopsInGenClosure* scan_perm, | |
741 int worker_i); | |
742 | |
743 // Apply "blk" to all the weak roots of the system. These include | |
744 // JNI weak roots, the code cache, system dictionary, symbol table, | |
745 // string table, and referents of reachable weak refs. | |
746 void g1_process_weak_roots(OopClosure* root_closure, | |
747 OopClosure* non_root_closure); | |
748 | |
749 // Invoke "save_marks" on all heap regions. | |
750 void save_marks(); | |
751 | |
752 // Free a heap region. | |
753 void free_region(HeapRegion* hr); | |
754 // A component of "free_region", exposed for 'batching'. | |
755 // All the params after "hr" are out params: the used bytes of the freed | |
756 // region(s), the number of H regions cleared, the number of regions | |
757 // freed, and pointers to the head and tail of a list of freed contig | |
758 // regions, linked throught the "next_on_unclean_list" field. | |
759 void free_region_work(HeapRegion* hr, | |
760 size_t& pre_used, | |
761 size_t& cleared_h, | |
762 size_t& freed_regions, | |
763 UncleanRegionList* list, | |
764 bool par = false); | |
765 | |
766 | |
767 // The concurrent marker (and the thread it runs in.) | |
768 ConcurrentMark* _cm; | |
769 ConcurrentMarkThread* _cmThread; | |
770 bool _mark_in_progress; | |
771 | |
772 // The concurrent refiner. | |
773 ConcurrentG1Refine* _cg1r; | |
774 | |
775 // The concurrent zero-fill thread. | |
776 ConcurrentZFThread* _czft; | |
777 | |
778 // The parallel task queues | |
779 RefToScanQueueSet *_task_queues; | |
780 | |
781 // True iff a evacuation has failed in the current collection. | |
782 bool _evacuation_failed; | |
783 | |
784 // Set the attribute indicating whether evacuation has failed in the | |
785 // current collection. | |
786 void set_evacuation_failed(bool b) { _evacuation_failed = b; } | |
787 | |
788 // Failed evacuations cause some logical from-space objects to have | |
789 // forwarding pointers to themselves. Reset them. | |
790 void remove_self_forwarding_pointers(); | |
791 | |
792 // When one is non-null, so is the other. Together, they each pair is | |
793 // an object with a preserved mark, and its mark value. | |
794 GrowableArray<oop>* _objs_with_preserved_marks; | |
795 GrowableArray<markOop>* _preserved_marks_of_objs; | |
796 | |
797 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
798 // word being overwritten with a self-forwarding-pointer. | |
799 void preserve_mark_if_necessary(oop obj, markOop m); | |
800 | |
801 // The stack of evac-failure objects left to be scanned. | |
802 GrowableArray<oop>* _evac_failure_scan_stack; | |
803 // The closure to apply to evac-failure objects. | |
804 | |
805 OopsInHeapRegionClosure* _evac_failure_closure; | |
806 // Set the field above. | |
807 void | |
808 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
809 _evac_failure_closure = evac_failure_closure; | |
810 } | |
811 | |
812 // Push "obj" on the scan stack. | |
813 void push_on_evac_failure_scan_stack(oop obj); | |
814 // Process scan stack entries until the stack is empty. | |
815 void drain_evac_failure_scan_stack(); | |
816 // True iff an invocation of "drain_scan_stack" is in progress; to | |
817 // prevent unnecessary recursion. | |
818 bool _drain_in_progress; | |
819 | |
820 // Do any necessary initialization for evacuation-failure handling. | |
821 // "cl" is the closure that will be used to process evac-failure | |
822 // objects. | |
823 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
824 // Do any necessary cleanup for evacuation-failure handling data | |
825 // structures. | |
826 void finalize_for_evac_failure(); | |
827 | |
828 // An attempt to evacuate "obj" has failed; take necessary steps. | |
829 void handle_evacuation_failure(oop obj); | |
830 oop handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, oop obj); | |
831 void handle_evacuation_failure_common(oop obj, markOop m); | |
832 | |
833 | |
834 // Ensure that the relevant gc_alloc regions are set. | |
835 void get_gc_alloc_regions(); | |
636 | 836 // We're done with GC alloc regions. We are going to tear down the |
837 // gc alloc list and remove the gc alloc tag from all the regions on | |
838 // that list. However, we will also retain the last (i.e., the one | |
839 // that is half-full) GC alloc region, per GCAllocPurpose, for | |
840 // possible reuse during the next collection, provided | |
841 // _retain_gc_alloc_region[] indicates that it should be the | |
842 // case. Said regions are kept in the _retained_gc_alloc_regions[] | |
843 // array. If the parameter totally is set, we will not retain any | |
844 // regions, irrespective of what _retain_gc_alloc_region[] | |
845 // indicates. | |
846 void release_gc_alloc_regions(bool totally); | |
847 #ifndef PRODUCT | |
848 // Useful for debugging. | |
849 void print_gc_alloc_regions(); | |
850 #endif // !PRODUCT | |
342 | 851 |
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852 // Instance of the concurrent mark is_alive closure for embedding |
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853 // into the reference processor as the is_alive_non_header. This |
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854 // prevents unnecessary additions to the discovered lists during |
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855 // concurrent discovery. |
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856 G1CMIsAliveClosure _is_alive_closure; |
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857 |
342 | 858 // ("Weak") Reference processing support |
859 ReferenceProcessor* _ref_processor; | |
860 | |
861 enum G1H_process_strong_roots_tasks { | |
862 G1H_PS_mark_stack_oops_do, | |
863 G1H_PS_refProcessor_oops_do, | |
864 // Leave this one last. | |
865 G1H_PS_NumElements | |
866 }; | |
867 | |
868 SubTasksDone* _process_strong_tasks; | |
869 | |
870 // List of regions which require zero filling. | |
871 UncleanRegionList _unclean_region_list; | |
872 bool _unclean_regions_coming; | |
873 | |
874 public: | |
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875 |
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876 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
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877 |
342 | 878 void set_refine_cte_cl_concurrency(bool concurrent); |
879 | |
1709 | 880 RefToScanQueue *task_queue(int i) const; |
342 | 881 |
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882 // A set of cards where updates happened during the GC |
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883 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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884 |
1705 | 885 // A DirtyCardQueueSet that is used to hold cards that contain |
886 // references into the current collection set. This is used to | |
887 // update the remembered sets of the regions in the collection | |
888 // set in the event of an evacuation failure. | |
889 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
890 { return _into_cset_dirty_card_queue_set; } | |
891 | |
342 | 892 // Create a G1CollectedHeap with the specified policy. |
893 // Must call the initialize method afterwards. | |
894 // May not return if something goes wrong. | |
895 G1CollectedHeap(G1CollectorPolicy* policy); | |
896 | |
897 // Initialize the G1CollectedHeap to have the initial and | |
898 // maximum sizes, permanent generation, and remembered and barrier sets | |
899 // specified by the policy object. | |
900 jint initialize(); | |
901 | |
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902 virtual void ref_processing_init(); |
342 | 903 |
904 void set_par_threads(int t) { | |
905 SharedHeap::set_par_threads(t); | |
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906 _process_strong_tasks->set_n_threads(t); |
342 | 907 } |
908 | |
909 virtual CollectedHeap::Name kind() const { | |
910 return CollectedHeap::G1CollectedHeap; | |
911 } | |
912 | |
913 // The current policy object for the collector. | |
914 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
915 | |
916 // Adaptive size policy. No such thing for g1. | |
917 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
918 | |
919 // The rem set and barrier set. | |
920 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
921 ModRefBarrierSet* mr_bs() const { return _mr_bs; } | |
922 | |
923 // The rem set iterator. | |
924 HeapRegionRemSetIterator* rem_set_iterator(int i) { | |
925 return _rem_set_iterator[i]; | |
926 } | |
927 | |
928 HeapRegionRemSetIterator* rem_set_iterator() { | |
929 return _rem_set_iterator[0]; | |
930 } | |
931 | |
932 unsigned get_gc_time_stamp() { | |
933 return _gc_time_stamp; | |
934 } | |
935 | |
936 void reset_gc_time_stamp() { | |
937 _gc_time_stamp = 0; | |
353
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938 OrderAccess::fence(); |
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939 } |
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940 |
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941 void increment_gc_time_stamp() { |
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942 ++_gc_time_stamp; |
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943 OrderAccess::fence(); |
342 | 944 } |
945 | |
1705 | 946 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
947 DirtyCardQueue* into_cset_dcq, | |
948 bool concurrent, int worker_i); | |
342 | 949 |
950 // The shared block offset table array. | |
951 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
952 | |
953 // Reference Processing accessor | |
954 ReferenceProcessor* ref_processor() { return _ref_processor; } | |
955 | |
956 // Reserved (g1 only; super method includes perm), capacity and the used | |
957 // portion in bytes. | |
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958 size_t g1_reserved_obj_bytes() const { return _g1_reserved.byte_size(); } |
342 | 959 virtual size_t capacity() const; |
960 virtual size_t used() const; | |
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961 // This should be called when we're not holding the heap lock. The |
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962 // result might be a bit inaccurate. |
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963 size_t used_unlocked() const; |
342 | 964 size_t recalculate_used() const; |
965 #ifndef PRODUCT | |
966 size_t recalculate_used_regions() const; | |
967 #endif // PRODUCT | |
968 | |
969 // These virtual functions do the actual allocation. | |
970 // Some heaps may offer a contiguous region for shared non-blocking | |
971 // allocation, via inlined code (by exporting the address of the top and | |
972 // end fields defining the extent of the contiguous allocation region.) | |
973 // But G1CollectedHeap doesn't yet support this. | |
974 | |
975 // Return an estimate of the maximum allocation that could be performed | |
976 // without triggering any collection or expansion activity. In a | |
977 // generational collector, for example, this is probably the largest | |
978 // allocation that could be supported (without expansion) in the youngest | |
979 // generation. It is "unsafe" because no locks are taken; the result | |
980 // should be treated as an approximation, not a guarantee, for use in | |
981 // heuristic resizing decisions. | |
982 virtual size_t unsafe_max_alloc(); | |
983 | |
984 virtual bool is_maximal_no_gc() const { | |
985 return _g1_storage.uncommitted_size() == 0; | |
986 } | |
987 | |
988 // The total number of regions in the heap. | |
989 size_t n_regions(); | |
990 | |
991 // The number of regions that are completely free. | |
992 size_t max_regions(); | |
993 | |
994 // The number of regions that are completely free. | |
995 size_t free_regions(); | |
996 | |
997 // The number of regions that are not completely free. | |
998 size_t used_regions() { return n_regions() - free_regions(); } | |
999 | |
1000 // True iff the ZF thread should run. | |
1001 bool should_zf(); | |
1002 | |
1003 // The number of regions available for "regular" expansion. | |
1004 size_t expansion_regions() { return _expansion_regions; } | |
1005 | |
1006 #ifndef PRODUCT | |
1007 bool regions_accounted_for(); | |
1008 bool print_region_accounting_info(); | |
1009 void print_region_counts(); | |
1010 #endif | |
1011 | |
1012 HeapRegion* alloc_region_from_unclean_list(bool zero_filled); | |
1013 HeapRegion* alloc_region_from_unclean_list_locked(bool zero_filled); | |
1014 | |
1015 void put_region_on_unclean_list(HeapRegion* r); | |
1016 void put_region_on_unclean_list_locked(HeapRegion* r); | |
1017 | |
1018 void prepend_region_list_on_unclean_list(UncleanRegionList* list); | |
1019 void prepend_region_list_on_unclean_list_locked(UncleanRegionList* list); | |
1020 | |
1021 void set_unclean_regions_coming(bool b); | |
1022 void set_unclean_regions_coming_locked(bool b); | |
1023 // Wait for cleanup to be complete. | |
1024 void wait_for_cleanup_complete(); | |
1025 // Like above, but assumes that the calling thread owns the Heap_lock. | |
1026 void wait_for_cleanup_complete_locked(); | |
1027 | |
1028 // Return the head of the unclean list. | |
1029 HeapRegion* peek_unclean_region_list_locked(); | |
1030 // Remove and return the head of the unclean list. | |
1031 HeapRegion* pop_unclean_region_list_locked(); | |
1032 | |
1033 // List of regions which are zero filled and ready for allocation. | |
1034 HeapRegion* _free_region_list; | |
1035 // Number of elements on the free list. | |
1036 size_t _free_region_list_size; | |
1037 | |
1038 // If the head of the unclean list is ZeroFilled, move it to the free | |
1039 // list. | |
1040 bool move_cleaned_region_to_free_list_locked(); | |
1041 bool move_cleaned_region_to_free_list(); | |
1042 | |
1043 void put_free_region_on_list_locked(HeapRegion* r); | |
1044 void put_free_region_on_list(HeapRegion* r); | |
1045 | |
1046 // Remove and return the head element of the free list. | |
1047 HeapRegion* pop_free_region_list_locked(); | |
1048 | |
1049 // If "zero_filled" is true, we first try the free list, then we try the | |
1050 // unclean list, zero-filling the result. If "zero_filled" is false, we | |
1051 // first try the unclean list, then the zero-filled list. | |
1052 HeapRegion* alloc_free_region_from_lists(bool zero_filled); | |
1053 | |
1054 // Verify the integrity of the region lists. | |
1055 void remove_allocated_regions_from_lists(); | |
1056 bool verify_region_lists(); | |
1057 bool verify_region_lists_locked(); | |
1058 size_t unclean_region_list_length(); | |
1059 size_t free_region_list_length(); | |
1060 | |
1061 // Perform a collection of the heap; intended for use in implementing | |
1062 // "System.gc". This probably implies as full a collection as the | |
1063 // "CollectedHeap" supports. | |
1064 virtual void collect(GCCause::Cause cause); | |
1065 | |
1066 // The same as above but assume that the caller holds the Heap_lock. | |
1067 void collect_locked(GCCause::Cause cause); | |
1068 | |
1069 // This interface assumes that it's being called by the | |
1070 // vm thread. It collects the heap assuming that the | |
1071 // heap lock is already held and that we are executing in | |
1072 // the context of the vm thread. | |
1073 virtual void collect_as_vm_thread(GCCause::Cause cause); | |
1074 | |
1075 // True iff a evacuation has failed in the most-recent collection. | |
1076 bool evacuation_failed() { return _evacuation_failed; } | |
1077 | |
1078 // Free a region if it is totally full of garbage. Returns the number of | |
1079 // bytes freed (0 ==> didn't free it). | |
1080 size_t free_region_if_totally_empty(HeapRegion *hr); | |
1081 void free_region_if_totally_empty_work(HeapRegion *hr, | |
1082 size_t& pre_used, | |
1083 size_t& cleared_h_regions, | |
1084 size_t& freed_regions, | |
1085 UncleanRegionList* list, | |
1086 bool par = false); | |
1087 | |
1088 // If we've done free region work that yields the given changes, update | |
1089 // the relevant global variables. | |
1090 void finish_free_region_work(size_t pre_used, | |
1091 size_t cleared_h_regions, | |
1092 size_t freed_regions, | |
1093 UncleanRegionList* list); | |
1094 | |
1095 | |
1096 // Returns "TRUE" iff "p" points into the allocated area of the heap. | |
1097 virtual bool is_in(const void* p) const; | |
1098 | |
1099 // Return "TRUE" iff the given object address is within the collection | |
1100 // set. | |
1101 inline bool obj_in_cs(oop obj); | |
1102 | |
1103 // Return "TRUE" iff the given object address is in the reserved | |
1104 // region of g1 (excluding the permanent generation). | |
1105 bool is_in_g1_reserved(const void* p) const { | |
1106 return _g1_reserved.contains(p); | |
1107 } | |
1108 | |
1109 // Returns a MemRegion that corresponds to the space that has been | |
1110 // committed in the heap | |
1111 MemRegion g1_committed() { | |
1112 return _g1_committed; | |
1113 } | |
1114 | |
941 | 1115 NOT_PRODUCT(bool is_in_closed_subset(const void* p) const;) |
342 | 1116 |
1117 // Dirty card table entries covering a list of young regions. | |
1118 void dirtyCardsForYoungRegions(CardTableModRefBS* ct_bs, HeapRegion* list); | |
1119 | |
1120 // This resets the card table to all zeros. It is used after | |
1121 // a collection pause which used the card table to claim cards. | |
1122 void cleanUpCardTable(); | |
1123 | |
1124 // Iteration functions. | |
1125 | |
1126 // Iterate over all the ref-containing fields of all objects, calling | |
1127 // "cl.do_oop" on each. | |
678 | 1128 virtual void oop_iterate(OopClosure* cl) { |
1129 oop_iterate(cl, true); | |
1130 } | |
1131 void oop_iterate(OopClosure* cl, bool do_perm); | |
342 | 1132 |
1133 // Same as above, restricted to a memory region. | |
678 | 1134 virtual void oop_iterate(MemRegion mr, OopClosure* cl) { |
1135 oop_iterate(mr, cl, true); | |
1136 } | |
1137 void oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm); | |
342 | 1138 |
1139 // Iterate over all objects, calling "cl.do_object" on each. | |
678 | 1140 virtual void object_iterate(ObjectClosure* cl) { |
1141 object_iterate(cl, true); | |
1142 } | |
1143 virtual void safe_object_iterate(ObjectClosure* cl) { | |
1144 object_iterate(cl, true); | |
1145 } | |
1146 void object_iterate(ObjectClosure* cl, bool do_perm); | |
342 | 1147 |
1148 // Iterate over all objects allocated since the last collection, calling | |
1149 // "cl.do_object" on each. The heap must have been initialized properly | |
1150 // to support this function, or else this call will fail. | |
1151 virtual void object_iterate_since_last_GC(ObjectClosure* cl); | |
1152 | |
1153 // Iterate over all spaces in use in the heap, in ascending address order. | |
1154 virtual void space_iterate(SpaceClosure* cl); | |
1155 | |
1156 // Iterate over heap regions, in address order, terminating the | |
1157 // iteration early if the "doHeapRegion" method returns "true". | |
1158 void heap_region_iterate(HeapRegionClosure* blk); | |
1159 | |
1160 // Iterate over heap regions starting with r (or the first region if "r" | |
1161 // is NULL), in address order, terminating early if the "doHeapRegion" | |
1162 // method returns "true". | |
1163 void heap_region_iterate_from(HeapRegion* r, HeapRegionClosure* blk); | |
1164 | |
1165 // As above but starting from the region at index idx. | |
1166 void heap_region_iterate_from(int idx, HeapRegionClosure* blk); | |
1167 | |
1168 HeapRegion* region_at(size_t idx); | |
1169 | |
1170 // Divide the heap region sequence into "chunks" of some size (the number | |
1171 // of regions divided by the number of parallel threads times some | |
1172 // overpartition factor, currently 4). Assumes that this will be called | |
1173 // in parallel by ParallelGCThreads worker threads with discinct worker | |
1174 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
1175 // calls will use the same "claim_value", and that that claim value is | |
1176 // different from the claim_value of any heap region before the start of | |
1177 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
1178 // attempting to claim the first region in each chunk, and, if | |
1179 // successful, applying the closure to each region in the chunk (and | |
1180 // setting the claim value of the second and subsequent regions of the | |
1181 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
1182 // i.e., that a closure never attempt to abort a traversal. | |
1183 void heap_region_par_iterate_chunked(HeapRegionClosure* blk, | |
1184 int worker, | |
1185 jint claim_value); | |
1186 | |
390 | 1187 // It resets all the region claim values to the default. |
1188 void reset_heap_region_claim_values(); | |
1189 | |
355 | 1190 #ifdef ASSERT |
1191 bool check_heap_region_claim_values(jint claim_value); | |
1192 #endif // ASSERT | |
1193 | |
342 | 1194 // Iterate over the regions (if any) in the current collection set. |
1195 void collection_set_iterate(HeapRegionClosure* blk); | |
1196 | |
1197 // As above but starting from region r | |
1198 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
1199 | |
1200 // Returns the first (lowest address) compactible space in the heap. | |
1201 virtual CompactibleSpace* first_compactible_space(); | |
1202 | |
1203 // A CollectedHeap will contain some number of spaces. This finds the | |
1204 // space containing a given address, or else returns NULL. | |
1205 virtual Space* space_containing(const void* addr) const; | |
1206 | |
1207 // A G1CollectedHeap will contain some number of heap regions. This | |
1208 // finds the region containing a given address, or else returns NULL. | |
1209 HeapRegion* heap_region_containing(const void* addr) const; | |
1210 | |
1211 // Like the above, but requires "addr" to be in the heap (to avoid a | |
1212 // null-check), and unlike the above, may return an continuing humongous | |
1213 // region. | |
1214 HeapRegion* heap_region_containing_raw(const void* addr) const; | |
1215 | |
1216 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
1217 // each address in the (reserved) heap is a member of exactly | |
1218 // one block. The defining characteristic of a block is that it is | |
1219 // possible to find its size, and thus to progress forward to the next | |
1220 // block. (Blocks may be of different sizes.) Thus, blocks may | |
1221 // represent Java objects, or they might be free blocks in a | |
1222 // free-list-based heap (or subheap), as long as the two kinds are | |
1223 // distinguishable and the size of each is determinable. | |
1224 | |
1225 // Returns the address of the start of the "block" that contains the | |
1226 // address "addr". We say "blocks" instead of "object" since some heaps | |
1227 // may not pack objects densely; a chunk may either be an object or a | |
1228 // non-object. | |
1229 virtual HeapWord* block_start(const void* addr) const; | |
1230 | |
1231 // Requires "addr" to be the start of a chunk, and returns its size. | |
1232 // "addr + size" is required to be the start of a new chunk, or the end | |
1233 // of the active area of the heap. | |
1234 virtual size_t block_size(const HeapWord* addr) const; | |
1235 | |
1236 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
1237 // the block is an object. | |
1238 virtual bool block_is_obj(const HeapWord* addr) const; | |
1239 | |
1240 // Does this heap support heap inspection? (+PrintClassHistogram) | |
1241 virtual bool supports_heap_inspection() const { return true; } | |
1242 | |
1243 // Section on thread-local allocation buffers (TLABs) | |
1244 // See CollectedHeap for semantics. | |
1245 | |
1246 virtual bool supports_tlab_allocation() const; | |
1247 virtual size_t tlab_capacity(Thread* thr) const; | |
1248 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; | |
1249 | |
1250 // Can a compiler initialize a new object without store barriers? | |
1251 // This permission only extends from the creation of a new object | |
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1252 // via a TLAB up to the first subsequent safepoint. If such permission |
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1253 // is granted for this heap type, the compiler promises to call |
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1254 // defer_store_barrier() below on any slow path allocation of |
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1255 // a new object for which such initializing store barriers will |
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1256 // have been elided. G1, like CMS, allows this, but should be |
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1257 // ready to provide a compensating write barrier as necessary |
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1258 // if that storage came out of a non-young region. The efficiency |
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1259 // of this implementation depends crucially on being able to |
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1260 // answer very efficiently in constant time whether a piece of |
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1261 // storage in the heap comes from a young region or not. |
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1262 // See ReduceInitialCardMarks. |
342 | 1263 virtual bool can_elide_tlab_store_barriers() const { |
1194
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1264 // 6920090: Temporarily disabled, because of lingering |
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1265 // instabilities related to RICM with G1. In the |
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1266 // interim, the option ReduceInitialCardMarksForG1 |
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1267 // below is left solely as a debugging device at least |
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1268 // until 6920109 fixes the instabilities. |
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1269 return ReduceInitialCardMarksForG1; |
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1270 } |
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1271 |
1166 | 1272 virtual bool card_mark_must_follow_store() const { |
1273 return true; | |
1274 } | |
1275 | |
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1276 bool is_in_young(oop obj) { |
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1277 HeapRegion* hr = heap_region_containing(obj); |
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1278 return hr != NULL && hr->is_young(); |
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1279 } |
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1280 |
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1281 // We don't need barriers for initializing stores to objects |
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1282 // in the young gen: for the SATB pre-barrier, there is no |
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1283 // pre-value that needs to be remembered; for the remembered-set |
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1284 // update logging post-barrier, we don't maintain remembered set |
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1285 // information for young gen objects. Note that non-generational |
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1286 // G1 does not have any "young" objects, should not elide |
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1287 // the rs logging barrier and so should always answer false below. |
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1288 // However, non-generational G1 (-XX:-G1Gen) appears to have |
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1289 // bit-rotted so was not tested below. |
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1290 virtual bool can_elide_initializing_store_barrier(oop new_obj) { |
1194
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1291 // Re 6920090, 6920109 above. |
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1292 assert(ReduceInitialCardMarksForG1, "Else cannot be here"); |
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1293 assert(G1Gen || !is_in_young(new_obj), |
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1294 "Non-generational G1 should never return true below"); |
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1295 return is_in_young(new_obj); |
342 | 1296 } |
1297 | |
1298 // Can a compiler elide a store barrier when it writes | |
1299 // a permanent oop into the heap? Applies when the compiler | |
1300 // is storing x to the heap, where x->is_perm() is true. | |
1301 virtual bool can_elide_permanent_oop_store_barriers() const { | |
1302 // At least until perm gen collection is also G1-ified, at | |
1303 // which point this should return false. | |
1304 return true; | |
1305 } | |
1306 | |
1307 virtual bool allocs_are_zero_filled(); | |
1308 | |
1309 // The boundary between a "large" and "small" array of primitives, in | |
1310 // words. | |
1311 virtual size_t large_typearray_limit(); | |
1312 | |
1313 // Returns "true" iff the given word_size is "very large". | |
1314 static bool isHumongous(size_t word_size) { | |
1313
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1315 // Note this has to be strictly greater-than as the TLABs |
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1316 // are capped at the humongous thresold and we want to |
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1317 // ensure that we don't try to allocate a TLAB as |
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1318 // humongous and that we don't allocate a humongous |
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1319 // object in a TLAB. |
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1320 return word_size > _humongous_object_threshold_in_words; |
342 | 1321 } |
1322 | |
1323 // Update mod union table with the set of dirty cards. | |
1324 void updateModUnion(); | |
1325 | |
1326 // Set the mod union bits corresponding to the given memRegion. Note | |
1327 // that this is always a safe operation, since it doesn't clear any | |
1328 // bits. | |
1329 void markModUnionRange(MemRegion mr); | |
1330 | |
1331 // Records the fact that a marking phase is no longer in progress. | |
1332 void set_marking_complete() { | |
1333 _mark_in_progress = false; | |
1334 } | |
1335 void set_marking_started() { | |
1336 _mark_in_progress = true; | |
1337 } | |
1338 bool mark_in_progress() { | |
1339 return _mark_in_progress; | |
1340 } | |
1341 | |
1342 // Print the maximum heap capacity. | |
1343 virtual size_t max_capacity() const; | |
1344 | |
1345 virtual jlong millis_since_last_gc(); | |
1346 | |
1347 // Perform any cleanup actions necessary before allowing a verification. | |
1348 virtual void prepare_for_verify(); | |
1349 | |
1350 // Perform verification. | |
811 | 1351 |
1352 // use_prev_marking == true -> use "prev" marking information, | |
1353 // use_prev_marking == false -> use "next" marking information | |
1354 // NOTE: Only the "prev" marking information is guaranteed to be | |
1355 // consistent most of the time, so most calls to this should use | |
1356 // use_prev_marking == true. Currently, there is only one case where | |
1357 // this is called with use_prev_marking == false, which is to verify | |
1358 // the "next" marking information at the end of remark. | |
1359 void verify(bool allow_dirty, bool silent, bool use_prev_marking); | |
1360 | |
1361 // Override; it uses the "prev" marking information | |
342 | 1362 virtual void verify(bool allow_dirty, bool silent); |
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1363 // Default behavior by calling print(tty); |
342 | 1364 virtual void print() const; |
838
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1365 // This calls print_on(st, PrintHeapAtGCExtended). |
342 | 1366 virtual void print_on(outputStream* st) const; |
838
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1367 // If extended is true, it will print out information for all |
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1368 // regions in the heap by calling print_on_extended(st). |
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1369 virtual void print_on(outputStream* st, bool extended) const; |
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1370 virtual void print_on_extended(outputStream* st) const; |
342 | 1371 |
1372 virtual void print_gc_threads_on(outputStream* st) const; | |
1373 virtual void gc_threads_do(ThreadClosure* tc) const; | |
1374 | |
1375 // Override | |
1376 void print_tracing_info() const; | |
1377 | |
1378 // If "addr" is a pointer into the (reserved?) heap, returns a positive | |
1379 // number indicating the "arena" within the heap in which "addr" falls. | |
1380 // Or else returns 0. | |
1381 virtual int addr_to_arena_id(void* addr) const; | |
1382 | |
1383 // Convenience function to be used in situations where the heap type can be | |
1384 // asserted to be this type. | |
1385 static G1CollectedHeap* heap(); | |
1386 | |
1387 void empty_young_list(); | |
1388 | |
1389 void set_region_short_lived_locked(HeapRegion* hr); | |
1390 // add appropriate methods for any other surv rate groups | |
1391 | |
1394
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1392 YoungList* young_list() { return _young_list; } |
342 | 1393 |
1394 // debugging | |
1395 bool check_young_list_well_formed() { | |
1396 return _young_list->check_list_well_formed(); | |
1397 } | |
1394
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1398 |
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1399 bool check_young_list_empty(bool check_heap, |
342 | 1400 bool check_sample = true); |
1401 | |
1402 // *** Stuff related to concurrent marking. It's not clear to me that so | |
1403 // many of these need to be public. | |
1404 | |
1405 // The functions below are helper functions that a subclass of | |
1406 // "CollectedHeap" can use in the implementation of its virtual | |
1407 // functions. | |
1408 // This performs a concurrent marking of the live objects in a | |
1409 // bitmap off to the side. | |
1410 void doConcurrentMark(); | |
1411 | |
1412 // This is called from the marksweep collector which then does | |
1413 // a concurrent mark and verifies that the results agree with | |
1414 // the stop the world marking. | |
1415 void checkConcurrentMark(); | |
1416 void do_sync_mark(); | |
1417 | |
1418 bool isMarkedPrev(oop obj) const; | |
1419 bool isMarkedNext(oop obj) const; | |
1420 | |
811 | 1421 // use_prev_marking == true -> use "prev" marking information, |
1422 // use_prev_marking == false -> use "next" marking information | |
1423 bool is_obj_dead_cond(const oop obj, | |
1424 const HeapRegion* hr, | |
1425 const bool use_prev_marking) const { | |
1426 if (use_prev_marking) { | |
1427 return is_obj_dead(obj, hr); | |
1428 } else { | |
1429 return is_obj_ill(obj, hr); | |
1430 } | |
1431 } | |
1432 | |
342 | 1433 // Determine if an object is dead, given the object and also |
1434 // the region to which the object belongs. An object is dead | |
1435 // iff a) it was not allocated since the last mark and b) it | |
1436 // is not marked. | |
1437 | |
1438 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
1439 return | |
1440 !hr->obj_allocated_since_prev_marking(obj) && | |
1441 !isMarkedPrev(obj); | |
1442 } | |
1443 | |
1444 // This is used when copying an object to survivor space. | |
1445 // If the object is marked live, then we mark the copy live. | |
1446 // If the object is allocated since the start of this mark | |
1447 // cycle, then we mark the copy live. | |
1448 // If the object has been around since the previous mark | |
1449 // phase, and hasn't been marked yet during this phase, | |
1450 // then we don't mark it, we just wait for the | |
1451 // current marking cycle to get to it. | |
1452 | |
1453 // This function returns true when an object has been | |
1454 // around since the previous marking and hasn't yet | |
1455 // been marked during this marking. | |
1456 | |
1457 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
1458 return | |
1459 !hr->obj_allocated_since_next_marking(obj) && | |
1460 !isMarkedNext(obj); | |
1461 } | |
1462 | |
1463 // Determine if an object is dead, given only the object itself. | |
1464 // This will find the region to which the object belongs and | |
1465 // then call the region version of the same function. | |
1466 | |
1467 // Added if it is in permanent gen it isn't dead. | |
1468 // Added if it is NULL it isn't dead. | |
1469 | |
811 | 1470 // use_prev_marking == true -> use "prev" marking information, |
1471 // use_prev_marking == false -> use "next" marking information | |
1472 bool is_obj_dead_cond(const oop obj, | |
1473 const bool use_prev_marking) { | |
1474 if (use_prev_marking) { | |
1475 return is_obj_dead(obj); | |
1476 } else { | |
1477 return is_obj_ill(obj); | |
1478 } | |
1479 } | |
1480 | |
1481 bool is_obj_dead(const oop obj) { | |
1482 const HeapRegion* hr = heap_region_containing(obj); | |
342 | 1483 if (hr == NULL) { |
1484 if (Universe::heap()->is_in_permanent(obj)) | |
1485 return false; | |
1486 else if (obj == NULL) return false; | |
1487 else return true; | |
1488 } | |
1489 else return is_obj_dead(obj, hr); | |
1490 } | |
1491 | |
811 | 1492 bool is_obj_ill(const oop obj) { |
1493 const HeapRegion* hr = heap_region_containing(obj); | |
342 | 1494 if (hr == NULL) { |
1495 if (Universe::heap()->is_in_permanent(obj)) | |
1496 return false; | |
1497 else if (obj == NULL) return false; | |
1498 else return true; | |
1499 } | |
1500 else return is_obj_ill(obj, hr); | |
1501 } | |
1502 | |
1503 // The following is just to alert the verification code | |
1504 // that a full collection has occurred and that the | |
1505 // remembered sets are no longer up to date. | |
1506 bool _full_collection; | |
1507 void set_full_collection() { _full_collection = true;} | |
1508 void clear_full_collection() {_full_collection = false;} | |
1509 bool full_collection() {return _full_collection;} | |
1510 | |
1511 ConcurrentMark* concurrent_mark() const { return _cm; } | |
1512 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
1513 | |
796
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1514 // The dirty cards region list is used to record a subset of regions |
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1515 // whose cards need clearing. The list if populated during the |
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1516 // remembered set scanning and drained during the card table |
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1517 // cleanup. Although the methods are reentrant, population/draining |
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1518 // phases must not overlap. For synchronization purposes the last |
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1519 // element on the list points to itself. |
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1520 HeapRegion* _dirty_cards_region_list; |
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1521 void push_dirty_cards_region(HeapRegion* hr); |
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1522 HeapRegion* pop_dirty_cards_region(); |
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1523 |
342 | 1524 public: |
1525 void stop_conc_gc_threads(); | |
1526 | |
1527 // <NEW PREDICTION> | |
1528 | |
1529 double predict_region_elapsed_time_ms(HeapRegion* hr, bool young); | |
1530 void check_if_region_is_too_expensive(double predicted_time_ms); | |
1531 size_t pending_card_num(); | |
1532 size_t max_pending_card_num(); | |
1533 size_t cards_scanned(); | |
1534 | |
1535 // </NEW PREDICTION> | |
1536 | |
1537 protected: | |
1538 size_t _max_heap_capacity; | |
1539 | |
1540 public: | |
1541 // Temporary: call to mark things unimplemented for the G1 heap (e.g., | |
1542 // MemoryService). In productization, we can make this assert false | |
1543 // to catch such places (as well as searching for calls to this...) | |
1544 static void g1_unimplemented(); | |
1545 | |
1546 }; | |
1547 | |
845
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1548 #define use_local_bitmaps 1 |
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1549 #define verify_local_bitmaps 0 |
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1550 #define oop_buffer_length 256 |
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1551 |
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1552 #ifndef PRODUCT |
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1553 class GCLabBitMap; |
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1554 class GCLabBitMapClosure: public BitMapClosure { |
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1555 private: |
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1556 ConcurrentMark* _cm; |
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1557 GCLabBitMap* _bitmap; |
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1558 |
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1559 public: |
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1560 GCLabBitMapClosure(ConcurrentMark* cm, |
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1561 GCLabBitMap* bitmap) { |
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1562 _cm = cm; |
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1563 _bitmap = bitmap; |
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1564 } |
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1565 |
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1566 virtual bool do_bit(size_t offset); |
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1567 }; |
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1568 #endif // !PRODUCT |
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1569 |
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1570 class GCLabBitMap: public BitMap { |
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1571 private: |
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1572 ConcurrentMark* _cm; |
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1573 |
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1574 int _shifter; |
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1575 size_t _bitmap_word_covers_words; |
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1576 |
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1577 // beginning of the heap |
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1578 HeapWord* _heap_start; |
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1579 |
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1580 // this is the actual start of the GCLab |
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1581 HeapWord* _real_start_word; |
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1582 |
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1583 // this is the actual end of the GCLab |
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1584 HeapWord* _real_end_word; |
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1585 |
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1586 // this is the first word, possibly located before the actual start |
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1587 // of the GCLab, that corresponds to the first bit of the bitmap |
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1588 HeapWord* _start_word; |
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1589 |
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1590 // size of a GCLab in words |
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1591 size_t _gclab_word_size; |
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1592 |
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1593 static int shifter() { |
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1594 return MinObjAlignment - 1; |
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1595 } |
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1596 |
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1597 // how many heap words does a single bitmap word corresponds to? |
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1598 static size_t bitmap_word_covers_words() { |
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1599 return BitsPerWord << shifter(); |
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1600 } |
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1601 |
1391
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1602 size_t gclab_word_size() const { |
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1603 return _gclab_word_size; |
845
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1604 } |
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1605 |
1391
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1606 // Calculates actual GCLab size in words |
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1607 size_t gclab_real_word_size() const { |
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1608 return bitmap_size_in_bits(pointer_delta(_real_end_word, _start_word)) |
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1609 / BitsPerWord; |
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1610 } |
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1611 |
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1612 static size_t bitmap_size_in_bits(size_t gclab_word_size) { |
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1613 size_t bits_in_bitmap = gclab_word_size >> shifter(); |
845
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1614 // We are going to ensure that the beginning of a word in this |
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1615 // bitmap also corresponds to the beginning of a word in the |
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1616 // global marking bitmap. To handle the case where a GCLab |
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1617 // starts from the middle of the bitmap, we need to add enough |
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1618 // space (i.e. up to a bitmap word) to ensure that we have |
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1619 // enough bits in the bitmap. |
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1620 return bits_in_bitmap + BitsPerWord - 1; |
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1621 } |
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1622 public: |
1391
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1623 GCLabBitMap(HeapWord* heap_start, size_t gclab_word_size) |
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1624 : BitMap(bitmap_size_in_bits(gclab_word_size)), |
845
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1625 _cm(G1CollectedHeap::heap()->concurrent_mark()), |
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1626 _shifter(shifter()), |
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1627 _bitmap_word_covers_words(bitmap_word_covers_words()), |
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1628 _heap_start(heap_start), |
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1629 _gclab_word_size(gclab_word_size), |
845
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1630 _real_start_word(NULL), |
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1631 _real_end_word(NULL), |
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1632 _start_word(NULL) |
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1633 { |
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1634 guarantee( size_in_words() >= bitmap_size_in_words(), |
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1635 "just making sure"); |
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1636 } |
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1637 |
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|
1638 inline unsigned heapWordToOffset(HeapWord* addr) { |
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1639 unsigned offset = (unsigned) pointer_delta(addr, _start_word) >> _shifter; |
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1640 assert(offset < size(), "offset should be within bounds"); |
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1641 return offset; |
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|
1642 } |
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1643 |
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1644 inline HeapWord* offsetToHeapWord(size_t offset) { |
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1645 HeapWord* addr = _start_word + (offset << _shifter); |
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1646 assert(_real_start_word <= addr && addr < _real_end_word, "invariant"); |
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1647 return addr; |
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|
1648 } |
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1649 |
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|
1650 bool fields_well_formed() { |
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1651 bool ret1 = (_real_start_word == NULL) && |
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1652 (_real_end_word == NULL) && |
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1653 (_start_word == NULL); |
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1654 if (ret1) |
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1655 return true; |
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 bool ret2 = _real_start_word >= _start_word && |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1658 _start_word < _real_end_word && |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1659 (_real_start_word + _gclab_word_size) == _real_end_word && |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1660 (_start_word + _gclab_word_size + _bitmap_word_covers_words) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1661 > _real_end_word; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1662 return ret2; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1663 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1664 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1665 inline bool mark(HeapWord* addr) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1666 guarantee(use_local_bitmaps, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1667 assert(fields_well_formed(), "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 if (addr >= _real_start_word && addr < _real_end_word) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1670 assert(!isMarked(addr), "should not have already been marked"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1671 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1672 // first mark it on the bitmap |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1673 at_put(heapWordToOffset(addr), true); |
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 return true; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1676 } else { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1677 return false; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1678 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1679 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1680 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1681 inline bool isMarked(HeapWord* addr) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1682 guarantee(use_local_bitmaps, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1683 assert(fields_well_formed(), "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1684 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1685 return at(heapWordToOffset(addr)); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1686 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1687 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1688 void set_buffer(HeapWord* start) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1689 guarantee(use_local_bitmaps, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1690 clear(); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1691 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1692 assert(start != NULL, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1693 _real_start_word = start; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1694 _real_end_word = start + _gclab_word_size; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1695 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1696 size_t diff = |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1697 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
|
1698 _start_word = start - diff; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1699 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1700 assert(fields_well_formed(), "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1701 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1702 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1703 #ifndef PRODUCT |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1704 void verify() { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1705 // verify that the marks have been propagated |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1706 GCLabBitMapClosure cl(_cm, this); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1707 iterate(&cl); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1708 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1709 #endif // PRODUCT |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1710 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1711 void retire() { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1712 guarantee(use_local_bitmaps, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1713 assert(fields_well_formed(), "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1714 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1715 if (_start_word != NULL) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1716 CMBitMap* mark_bitmap = _cm->nextMarkBitMap(); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1717 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1718 // 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
|
1719 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
|
1720 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1721 mark_bitmap->mostly_disjoint_range_union(this, |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1722 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
|
1723 _start_word, |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1724 gclab_real_word_size()); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1725 _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
|
1726 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1727 #ifndef PRODUCT |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1728 if (use_local_bitmaps && verify_local_bitmaps) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1729 verify(); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1730 #endif // PRODUCT |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1731 } else { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1732 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
|
1733 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1734 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1735 |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1736 size_t bitmap_size_in_words() const { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1737 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
|
1738 } |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1739 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1740 }; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1741 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1742 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1743 private: |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1744 bool _retired; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1745 bool _during_marking; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1746 GCLabBitMap _bitmap; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1747 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1748 public: |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1749 G1ParGCAllocBuffer(size_t gclab_word_size) : |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1750 ParGCAllocBuffer(gclab_word_size), |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1751 _during_marking(G1CollectedHeap::heap()->mark_in_progress()), |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1752 _bitmap(G1CollectedHeap::heap()->reserved_region().start(), gclab_word_size), |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1753 _retired(false) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1754 { } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1755 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1756 inline bool mark(HeapWord* addr) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1757 guarantee(use_local_bitmaps, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1758 assert(_during_marking, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1759 return _bitmap.mark(addr); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1760 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1761 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1762 inline void set_buf(HeapWord* buf) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1763 if (use_local_bitmaps && _during_marking) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1764 _bitmap.set_buffer(buf); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1765 ParGCAllocBuffer::set_buf(buf); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1766 _retired = false; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1767 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1768 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1769 inline void retire(bool end_of_gc, bool retain) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1770 if (_retired) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1771 return; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1772 if (use_local_bitmaps && _during_marking) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1773 _bitmap.retire(); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1774 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1775 ParGCAllocBuffer::retire(end_of_gc, retain); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1776 _retired = true; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1777 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1778 }; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1779 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1780 class G1ParScanThreadState : public StackObj { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1781 protected: |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1782 G1CollectedHeap* _g1h; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1783 RefToScanQueue* _refs; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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1784 DirtyCardQueue _dcq; |
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1785 CardTableModRefBS* _ct_bs; |
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1786 G1RemSet* _g1_rem; |
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1787 |
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1788 G1ParGCAllocBuffer _surviving_alloc_buffer; |
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1789 G1ParGCAllocBuffer _tenured_alloc_buffer; |
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1790 G1ParGCAllocBuffer* _alloc_buffers[GCAllocPurposeCount]; |
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1791 ageTable _age_table; |
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1792 |
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1793 size_t _alloc_buffer_waste; |
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1794 size_t _undo_waste; |
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1795 |
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1796 OopsInHeapRegionClosure* _evac_failure_cl; |
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1797 G1ParScanHeapEvacClosure* _evac_cl; |
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1798 G1ParScanPartialArrayClosure* _partial_scan_cl; |
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1799 |
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1800 int _hash_seed; |
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1801 int _queue_num; |
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1802 |
1611 | 1803 size_t _term_attempts; |
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1804 |
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1805 double _start; |
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1806 double _start_strong_roots; |
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1807 double _strong_roots_time; |
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1808 double _start_term; |
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1809 double _term_time; |
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1810 |
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1811 // Map from young-age-index (0 == not young, 1 is youngest) to |
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1812 // surviving words. base is what we get back from the malloc call |
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1813 size_t* _surviving_young_words_base; |
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1814 // this points into the array, as we use the first few entries for padding |
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1815 size_t* _surviving_young_words; |
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1816 |
1709 | 1817 #define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t)) |
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1818 |
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1819 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } |
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1820 |
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1821 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } |
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1822 |
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1823 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
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1824 CardTableModRefBS* ctbs() { return _ct_bs; } |
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1825 |
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1826 template <class T> void immediate_rs_update(HeapRegion* from, T* p, int tid) { |
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1827 if (!from->is_survivor()) { |
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1828 _g1_rem->par_write_ref(from, p, tid); |
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1829 } |
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1830 } |
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1831 |
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1832 template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) { |
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1833 // If the new value of the field points to the same region or |
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1834 // is the to-space, we don't need to include it in the Rset updates. |
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1835 if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) { |
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1836 size_t card_index = ctbs()->index_for(p); |
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1837 // If the card hasn't been added to the buffer, do it. |
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1838 if (ctbs()->mark_card_deferred(card_index)) { |
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1839 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
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1840 } |
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1841 } |
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1842 } |
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1843 |
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1844 public: |
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1845 G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num); |
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1846 |
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1847 ~G1ParScanThreadState() { |
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1848 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base); |
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1849 } |
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1850 |
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1851 RefToScanQueue* refs() { return _refs; } |
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1852 ageTable* age_table() { return &_age_table; } |
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1853 |
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1854 G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) { |
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1855 return _alloc_buffers[purpose]; |
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1856 } |
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1857 |
1709 | 1858 size_t alloc_buffer_waste() const { return _alloc_buffer_waste; } |
1859 size_t undo_waste() const { return _undo_waste; } | |
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1860 |
1862
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1861 #ifdef ASSERT |
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1862 bool verify_ref(narrowOop* ref) const; |
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1863 bool verify_ref(oop* ref) const; |
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1864 bool verify_task(StarTask ref) const; |
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1865 #endif // ASSERT |
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1866 |
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1867 template <class T> void push_on_queue(T* ref) { |
1862
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1868 assert(verify_ref(ref), "sanity"); |
1709 | 1869 refs()->push(ref); |
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1870 } |
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1871 |
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1872 template <class T> void update_rs(HeapRegion* from, T* p, int tid) { |
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1873 if (G1DeferredRSUpdate) { |
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1874 deferred_rs_update(from, p, tid); |
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1875 } else { |
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1876 immediate_rs_update(from, p, tid); |
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1877 } |
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1878 } |
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1879 |
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1880 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
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1881 |
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1882 HeapWord* obj = NULL; |
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1883 size_t gclab_word_size = _g1h->desired_plab_sz(purpose); |
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1884 if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) { |
845
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1885 G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose); |
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1886 assert(gclab_word_size == alloc_buf->word_sz(), |
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1887 "dynamic resizing is not supported"); |
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1888 add_to_alloc_buffer_waste(alloc_buf->words_remaining()); |
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1889 alloc_buf->retire(false, false); |
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1890 |
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1891 HeapWord* buf = _g1h->par_allocate_during_gc(purpose, gclab_word_size); |
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1892 if (buf == NULL) return NULL; // Let caller handle allocation failure. |
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1893 // Otherwise. |
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1894 alloc_buf->set_buf(buf); |
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1895 |
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1896 obj = alloc_buf->allocate(word_sz); |
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1897 assert(obj != NULL, "buffer was definitely big enough..."); |
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1898 } else { |
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1899 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
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1900 } |
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1901 return obj; |
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1902 } |
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1903 |
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1904 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { |
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1905 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); |
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1906 if (obj != NULL) return obj; |
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1907 return allocate_slow(purpose, word_sz); |
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1908 } |
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1909 |
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1910 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { |
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1911 if (alloc_buffer(purpose)->contains(obj)) { |
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1912 assert(alloc_buffer(purpose)->contains(obj + word_sz - 1), |
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1913 "should contain whole object"); |
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1914 alloc_buffer(purpose)->undo_allocation(obj, word_sz); |
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1915 } else { |
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1916 CollectedHeap::fill_with_object(obj, word_sz); |
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1917 add_to_undo_waste(word_sz); |
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1918 } |
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1919 } |
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1920 |
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1921 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { |
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1922 _evac_failure_cl = evac_failure_cl; |
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1923 } |
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1924 OopsInHeapRegionClosure* evac_failure_closure() { |
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1925 return _evac_failure_cl; |
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1926 } |
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1927 |
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1928 void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) { |
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1929 _evac_cl = evac_cl; |
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1930 } |
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1931 |
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1932 void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) { |
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1933 _partial_scan_cl = partial_scan_cl; |
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1934 } |
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1935 |
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1936 int* hash_seed() { return &_hash_seed; } |
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1937 int queue_num() { return _queue_num; } |
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1938 |
1709 | 1939 size_t term_attempts() const { return _term_attempts; } |
1611 | 1940 void note_term_attempt() { _term_attempts++; } |
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1941 |
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1942 void start_strong_roots() { |
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1943 _start_strong_roots = os::elapsedTime(); |
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1944 } |
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1945 void end_strong_roots() { |
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1946 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); |
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1947 } |
1709 | 1948 double strong_roots_time() const { return _strong_roots_time; } |
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1949 |
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1950 void start_term_time() { |
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1951 note_term_attempt(); |
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1952 _start_term = os::elapsedTime(); |
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1953 } |
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1954 void end_term_time() { |
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1955 _term_time += (os::elapsedTime() - _start_term); |
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1956 } |
1709 | 1957 double term_time() const { return _term_time; } |
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1958 |
1709 | 1959 double elapsed_time() const { |
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1960 return os::elapsedTime() - _start; |
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1961 } |
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1962 |
1709 | 1963 static void |
1964 print_termination_stats_hdr(outputStream* const st = gclog_or_tty); | |
1965 void | |
1966 print_termination_stats(int i, outputStream* const st = gclog_or_tty) const; | |
1967 | |
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1968 size_t* surviving_young_words() { |
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1969 // We add on to hide entry 0 which accumulates surviving words for |
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1970 // age -1 regions (i.e. non-young ones) |
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1971 return _surviving_young_words; |
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1972 } |
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1973 |
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1974 void retire_alloc_buffers() { |
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1975 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
1391
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1976 size_t waste = _alloc_buffers[ap]->words_remaining(); |
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1977 add_to_alloc_buffer_waste(waste); |
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1978 _alloc_buffers[ap]->retire(true, false); |
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1979 } |
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1980 } |
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1981 |
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1982 template <class T> void deal_with_reference(T* ref_to_scan) { |
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1983 if (has_partial_array_mask(ref_to_scan)) { |
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1984 _partial_scan_cl->do_oop_nv(ref_to_scan); |
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1985 } else { |
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1986 // Note: we can use "raw" versions of "region_containing" because |
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1987 // "obj_to_scan" is definitely in the heap, and is not in a |
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1988 // humongous region. |
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1989 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); |
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1990 _evac_cl->set_region(r); |
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1991 _evac_cl->do_oop_nv(ref_to_scan); |
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1992 } |
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1993 } |
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1994 |
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1995 void deal_with_reference(StarTask ref) { |
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1996 assert(verify_task(ref), "sanity"); |
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1997 if (ref.is_narrow()) { |
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1998 deal_with_reference((narrowOop*)ref); |
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1999 } else { |
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2000 deal_with_reference((oop*)ref); |
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2001 } |
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2002 } |
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2003 |
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2004 public: |
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2005 void trim_queue(); |
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2006 }; |
1972 | 2007 |
2008 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |