Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 1313:664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
Summary: A TLAB became large enough to be considered a humongous object allowing multiple objects to be allocated in a humongous region, which violates a basic assumption about humongous regions. The changes ensure that TLABs cannot be regarded as humongous.
Reviewed-by: iveresov, tonyp
author | johnc |
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date | Thu, 11 Mar 2010 11:44:43 -0800 |
parents | 2a1472c30599 |
children | 79e419e5ea3b |
rev | line source |
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342 | 1 /* |
579 | 2 * Copyright 2001-2009 Sun Microsystems, Inc. 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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 // A "G1CollectedHeap" is an implementation of a java heap for HotSpot. | |
26 // It uses the "Garbage First" heap organization and algorithm, which | |
27 // may combine concurrent marking with parallel, incremental compaction of | |
28 // heap subsets that will yield large amounts of garbage. | |
29 | |
30 class HeapRegion; | |
31 class HeapRegionSeq; | |
32 class PermanentGenerationSpec; | |
33 class GenerationSpec; | |
34 class OopsInHeapRegionClosure; | |
35 class G1ScanHeapEvacClosure; | |
36 class ObjectClosure; | |
37 class SpaceClosure; | |
38 class CompactibleSpaceClosure; | |
39 class Space; | |
40 class G1CollectorPolicy; | |
41 class GenRemSet; | |
42 class G1RemSet; | |
43 class HeapRegionRemSetIterator; | |
44 class ConcurrentMark; | |
45 class ConcurrentMarkThread; | |
46 class ConcurrentG1Refine; | |
47 class ConcurrentZFThread; | |
48 | |
49 // If want to accumulate detailed statistics on work queues | |
50 // turn this on. | |
51 #define G1_DETAILED_STATS 0 | |
52 | |
53 #if G1_DETAILED_STATS | |
54 # define IF_G1_DETAILED_STATS(code) code | |
55 #else | |
56 # define IF_G1_DETAILED_STATS(code) | |
57 #endif | |
58 | |
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59 typedef GenericTaskQueue<StarTask> RefToScanQueue; |
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60 typedef GenericTaskQueueSet<RefToScanQueue> RefToScanQueueSet; |
342 | 61 |
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62 typedef int RegionIdx_t; // needs to hold [ 0..max_regions() ) |
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63 typedef int CardIdx_t; // needs to hold [ 0..CardsPerRegion ) |
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64 |
342 | 65 enum G1GCThreadGroups { |
66 G1CRGroup = 0, | |
67 G1ZFGroup = 1, | |
68 G1CMGroup = 2, | |
69 G1CLGroup = 3 | |
70 }; | |
71 | |
72 enum GCAllocPurpose { | |
73 GCAllocForTenured, | |
74 GCAllocForSurvived, | |
75 GCAllocPurposeCount | |
76 }; | |
77 | |
78 class YoungList : public CHeapObj { | |
79 private: | |
80 G1CollectedHeap* _g1h; | |
81 | |
82 HeapRegion* _head; | |
83 | |
84 HeapRegion* _scan_only_head; | |
85 HeapRegion* _scan_only_tail; | |
86 size_t _length; | |
87 size_t _scan_only_length; | |
88 | |
89 size_t _last_sampled_rs_lengths; | |
90 size_t _sampled_rs_lengths; | |
91 HeapRegion* _curr; | |
92 HeapRegion* _curr_scan_only; | |
93 | |
94 HeapRegion* _survivor_head; | |
545 | 95 HeapRegion* _survivor_tail; |
342 | 96 size_t _survivor_length; |
97 | |
98 void empty_list(HeapRegion* list); | |
99 | |
100 public: | |
101 YoungList(G1CollectedHeap* g1h); | |
102 | |
103 void push_region(HeapRegion* hr); | |
104 void add_survivor_region(HeapRegion* hr); | |
105 HeapRegion* pop_region(); | |
106 void empty_list(); | |
107 bool is_empty() { return _length == 0; } | |
108 size_t length() { return _length; } | |
109 size_t scan_only_length() { return _scan_only_length; } | |
545 | 110 size_t survivor_length() { return _survivor_length; } |
342 | 111 |
112 void rs_length_sampling_init(); | |
113 bool rs_length_sampling_more(); | |
114 void rs_length_sampling_next(); | |
115 | |
116 void reset_sampled_info() { | |
117 _last_sampled_rs_lengths = 0; | |
118 } | |
119 size_t sampled_rs_lengths() { return _last_sampled_rs_lengths; } | |
120 | |
121 // for development purposes | |
122 void reset_auxilary_lists(); | |
123 HeapRegion* first_region() { return _head; } | |
124 HeapRegion* first_scan_only_region() { return _scan_only_head; } | |
125 HeapRegion* first_survivor_region() { return _survivor_head; } | |
545 | 126 HeapRegion* last_survivor_region() { return _survivor_tail; } |
342 | 127 HeapRegion* par_get_next_scan_only_region() { |
128 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
129 HeapRegion* ret = _curr_scan_only; | |
130 if (ret != NULL) | |
131 _curr_scan_only = ret->get_next_young_region(); | |
132 return ret; | |
133 } | |
134 | |
135 // debugging | |
136 bool check_list_well_formed(); | |
137 bool check_list_empty(bool ignore_scan_only_list, | |
138 bool check_sample = true); | |
139 void print(); | |
140 }; | |
141 | |
142 class RefineCardTableEntryClosure; | |
143 class G1CollectedHeap : public SharedHeap { | |
144 friend class VM_G1CollectForAllocation; | |
145 friend class VM_GenCollectForPermanentAllocation; | |
146 friend class VM_G1CollectFull; | |
147 friend class VM_G1IncCollectionPause; | |
148 friend class VMStructs; | |
149 | |
150 // Closures used in implementation. | |
151 friend class G1ParCopyHelper; | |
152 friend class G1IsAliveClosure; | |
153 friend class G1EvacuateFollowersClosure; | |
154 friend class G1ParScanThreadState; | |
155 friend class G1ParScanClosureSuper; | |
156 friend class G1ParEvacuateFollowersClosure; | |
157 friend class G1ParTask; | |
158 friend class G1FreeGarbageRegionClosure; | |
159 friend class RefineCardTableEntryClosure; | |
160 friend class G1PrepareCompactClosure; | |
161 friend class RegionSorter; | |
162 friend class CountRCClosure; | |
163 friend class EvacPopObjClosure; | |
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164 friend class G1ParCleanupCTTask; |
342 | 165 |
166 // Other related classes. | |
167 friend class G1MarkSweep; | |
168 | |
169 private: | |
170 // The one and only G1CollectedHeap, so static functions can find it. | |
171 static G1CollectedHeap* _g1h; | |
172 | |
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173 static size_t _humongous_object_threshold_in_words; |
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174 |
342 | 175 // Storage for the G1 heap (excludes the permanent generation). |
176 VirtualSpace _g1_storage; | |
177 MemRegion _g1_reserved; | |
178 | |
179 // The part of _g1_storage that is currently committed. | |
180 MemRegion _g1_committed; | |
181 | |
182 // The maximum part of _g1_storage that has ever been committed. | |
183 MemRegion _g1_max_committed; | |
184 | |
185 // The number of regions that are completely free. | |
186 size_t _free_regions; | |
187 | |
188 // The number of regions we could create by expansion. | |
189 size_t _expansion_regions; | |
190 | |
191 // Return the number of free regions in the heap (by direct counting.) | |
192 size_t count_free_regions(); | |
193 // Return the number of free regions on the free and unclean lists. | |
194 size_t count_free_regions_list(); | |
195 | |
196 // The block offset table for the G1 heap. | |
197 G1BlockOffsetSharedArray* _bot_shared; | |
198 | |
199 // Move all of the regions off the free lists, then rebuild those free | |
200 // lists, before and after full GC. | |
201 void tear_down_region_lists(); | |
202 void rebuild_region_lists(); | |
203 // This sets all non-empty regions to need zero-fill (which they will if | |
204 // they are empty after full collection.) | |
205 void set_used_regions_to_need_zero_fill(); | |
206 | |
207 // The sequence of all heap regions in the heap. | |
208 HeapRegionSeq* _hrs; | |
209 | |
210 // The region from which normal-sized objects are currently being | |
211 // allocated. May be NULL. | |
212 HeapRegion* _cur_alloc_region; | |
213 | |
214 // Postcondition: cur_alloc_region == NULL. | |
215 void abandon_cur_alloc_region(); | |
636 | 216 void abandon_gc_alloc_regions(); |
342 | 217 |
218 // The to-space memory regions into which objects are being copied during | |
219 // a GC. | |
220 HeapRegion* _gc_alloc_regions[GCAllocPurposeCount]; | |
545 | 221 size_t _gc_alloc_region_counts[GCAllocPurposeCount]; |
636 | 222 // These are the regions, one per GCAllocPurpose, that are half-full |
223 // at the end of a collection and that we want to reuse during the | |
224 // next collection. | |
225 HeapRegion* _retained_gc_alloc_regions[GCAllocPurposeCount]; | |
226 // This specifies whether we will keep the last half-full region at | |
227 // the end of a collection so that it can be reused during the next | |
228 // collection (this is specified per GCAllocPurpose) | |
229 bool _retain_gc_alloc_region[GCAllocPurposeCount]; | |
342 | 230 |
231 // A list of the regions that have been set to be alloc regions in the | |
232 // current collection. | |
233 HeapRegion* _gc_alloc_region_list; | |
234 | |
235 // When called by par thread, require par_alloc_during_gc_lock() to be held. | |
236 void push_gc_alloc_region(HeapRegion* hr); | |
237 | |
238 // This should only be called single-threaded. Undeclares all GC alloc | |
239 // regions. | |
240 void forget_alloc_region_list(); | |
241 | |
242 // Should be used to set an alloc region, because there's other | |
243 // associated bookkeeping. | |
244 void set_gc_alloc_region(int purpose, HeapRegion* r); | |
245 | |
246 // Check well-formedness of alloc region list. | |
247 bool check_gc_alloc_regions(); | |
248 | |
249 // Outside of GC pauses, the number of bytes used in all regions other | |
250 // than the current allocation region. | |
251 size_t _summary_bytes_used; | |
252 | |
526 | 253 // This is used for a quick test on whether a reference points into |
254 // the collection set or not. Basically, we have an array, with one | |
255 // byte per region, and that byte denotes whether the corresponding | |
256 // region is in the collection set or not. The entry corresponding | |
257 // the bottom of the heap, i.e., region 0, is pointed to by | |
258 // _in_cset_fast_test_base. The _in_cset_fast_test field has been | |
259 // biased so that it actually points to address 0 of the address | |
260 // space, to make the test as fast as possible (we can simply shift | |
261 // the address to address into it, instead of having to subtract the | |
262 // bottom of the heap from the address before shifting it; basically | |
263 // it works in the same way the card table works). | |
264 bool* _in_cset_fast_test; | |
265 | |
266 // The allocated array used for the fast test on whether a reference | |
267 // points into the collection set or not. This field is also used to | |
268 // free the array. | |
269 bool* _in_cset_fast_test_base; | |
270 | |
271 // The length of the _in_cset_fast_test_base array. | |
272 size_t _in_cset_fast_test_length; | |
273 | |
353
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274 volatile unsigned _gc_time_stamp; |
342 | 275 |
276 size_t* _surviving_young_words; | |
277 | |
278 void setup_surviving_young_words(); | |
279 void update_surviving_young_words(size_t* surv_young_words); | |
280 void cleanup_surviving_young_words(); | |
281 | |
282 protected: | |
283 | |
284 // Returns "true" iff none of the gc alloc regions have any allocations | |
285 // since the last call to "save_marks". | |
286 bool all_alloc_regions_no_allocs_since_save_marks(); | |
545 | 287 // Perform finalization stuff on all allocation regions. |
288 void retire_all_alloc_regions(); | |
342 | 289 |
290 // The number of regions allocated to hold humongous objects. | |
291 int _num_humongous_regions; | |
292 YoungList* _young_list; | |
293 | |
294 // The current policy object for the collector. | |
295 G1CollectorPolicy* _g1_policy; | |
296 | |
297 // Parallel allocation lock to protect the current allocation region. | |
298 Mutex _par_alloc_during_gc_lock; | |
299 Mutex* par_alloc_during_gc_lock() { return &_par_alloc_during_gc_lock; } | |
300 | |
301 // If possible/desirable, allocate a new HeapRegion for normal object | |
302 // allocation sufficient for an allocation of the given "word_size". | |
303 // If "do_expand" is true, will attempt to expand the heap if necessary | |
304 // to to satisfy the request. If "zero_filled" is true, requires a | |
305 // zero-filled region. | |
306 // (Returning NULL will trigger a GC.) | |
307 virtual HeapRegion* newAllocRegion_work(size_t word_size, | |
308 bool do_expand, | |
309 bool zero_filled); | |
310 | |
311 virtual HeapRegion* newAllocRegion(size_t word_size, | |
312 bool zero_filled = true) { | |
313 return newAllocRegion_work(word_size, false, zero_filled); | |
314 } | |
315 virtual HeapRegion* newAllocRegionWithExpansion(int purpose, | |
316 size_t word_size, | |
317 bool zero_filled = true); | |
318 | |
319 // Attempt to allocate an object of the given (very large) "word_size". | |
320 // Returns "NULL" on failure. | |
321 virtual HeapWord* humongousObjAllocate(size_t word_size); | |
322 | |
323 // If possible, allocate a block of the given word_size, else return "NULL". | |
324 // Returning NULL will trigger GC or heap expansion. | |
325 // These two methods have rather awkward pre- and | |
326 // post-conditions. If they are called outside a safepoint, then | |
327 // they assume that the caller is holding the heap lock. Upon return | |
328 // they release the heap lock, if they are returning a non-NULL | |
329 // value. attempt_allocation_slow() also dirties the cards of a | |
330 // newly-allocated young region after it releases the heap | |
331 // lock. This change in interface was the neatest way to achieve | |
332 // this card dirtying without affecting mem_allocate(), which is a | |
333 // more frequently called method. We tried two or three different | |
334 // approaches, but they were even more hacky. | |
335 HeapWord* attempt_allocation(size_t word_size, | |
336 bool permit_collection_pause = true); | |
337 | |
338 HeapWord* attempt_allocation_slow(size_t word_size, | |
339 bool permit_collection_pause = true); | |
340 | |
341 // Allocate blocks during garbage collection. Will ensure an | |
342 // allocation region, either by picking one or expanding the | |
343 // heap, and then allocate a block of the given size. The block | |
344 // may not be a humongous - it must fit into a single heap region. | |
345 HeapWord* allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
346 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
347 | |
348 HeapWord* allocate_during_gc_slow(GCAllocPurpose purpose, | |
349 HeapRegion* alloc_region, | |
350 bool par, | |
351 size_t word_size); | |
352 | |
353 // Ensure that no further allocations can happen in "r", bearing in mind | |
354 // that parallel threads might be attempting allocations. | |
355 void par_allocate_remaining_space(HeapRegion* r); | |
356 | |
545 | 357 // Retires an allocation region when it is full or at the end of a |
358 // GC pause. | |
359 void retire_alloc_region(HeapRegion* alloc_region, bool par); | |
360 | |
342 | 361 // Helper function for two callbacks below. |
362 // "full", if true, indicates that the GC is for a System.gc() request, | |
363 // and should collect the entire heap. If "clear_all_soft_refs" is true, | |
364 // all soft references are cleared during the GC. If "full" is false, | |
365 // "word_size" describes the allocation that the GC should | |
366 // attempt (at least) to satisfy. | |
367 void do_collection(bool full, bool clear_all_soft_refs, | |
368 size_t word_size); | |
369 | |
370 // Callback from VM_G1CollectFull operation. | |
371 // Perform a full collection. | |
372 void do_full_collection(bool clear_all_soft_refs); | |
373 | |
374 // Resize the heap if necessary after a full collection. If this is | |
375 // after a collect-for allocation, "word_size" is the allocation size, | |
376 // and will be considered part of the used portion of the heap. | |
377 void resize_if_necessary_after_full_collection(size_t word_size); | |
378 | |
379 // Callback from VM_G1CollectForAllocation operation. | |
380 // This function does everything necessary/possible to satisfy a | |
381 // failed allocation request (including collection, expansion, etc.) | |
382 HeapWord* satisfy_failed_allocation(size_t word_size); | |
383 | |
384 // Attempting to expand the heap sufficiently | |
385 // to support an allocation of the given "word_size". If | |
386 // successful, perform the allocation and return the address of the | |
387 // allocated block, or else "NULL". | |
388 virtual HeapWord* expand_and_allocate(size_t word_size); | |
389 | |
390 public: | |
391 // Expand the garbage-first heap by at least the given size (in bytes!). | |
392 // (Rounds up to a HeapRegion boundary.) | |
393 virtual void expand(size_t expand_bytes); | |
394 | |
395 // Do anything common to GC's. | |
396 virtual void gc_prologue(bool full); | |
397 virtual void gc_epilogue(bool full); | |
398 | |
526 | 399 // We register a region with the fast "in collection set" test. We |
400 // simply set to true the array slot corresponding to this region. | |
401 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
402 assert(_in_cset_fast_test_base != NULL, "sanity"); | |
403 assert(r->in_collection_set(), "invariant"); | |
404 int index = r->hrs_index(); | |
405 assert(0 <= (size_t) index && (size_t) index < _in_cset_fast_test_length, | |
406 "invariant"); | |
407 assert(!_in_cset_fast_test_base[index], "invariant"); | |
408 _in_cset_fast_test_base[index] = true; | |
409 } | |
410 | |
411 // This is a fast test on whether a reference points into the | |
412 // collection set or not. It does not assume that the reference | |
413 // points into the heap; if it doesn't, it will return false. | |
414 bool in_cset_fast_test(oop obj) { | |
415 assert(_in_cset_fast_test != NULL, "sanity"); | |
416 if (_g1_committed.contains((HeapWord*) obj)) { | |
417 // no need to subtract the bottom of the heap from obj, | |
418 // _in_cset_fast_test is biased | |
419 size_t index = ((size_t) obj) >> HeapRegion::LogOfHRGrainBytes; | |
420 bool ret = _in_cset_fast_test[index]; | |
421 // let's make sure the result is consistent with what the slower | |
422 // test returns | |
423 assert( ret || !obj_in_cs(obj), "sanity"); | |
424 assert(!ret || obj_in_cs(obj), "sanity"); | |
425 return ret; | |
426 } else { | |
427 return false; | |
428 } | |
429 } | |
430 | |
342 | 431 protected: |
432 | |
433 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
434 // (Rounds down to a HeapRegion boundary.) | |
435 virtual void shrink(size_t expand_bytes); | |
436 void shrink_helper(size_t expand_bytes); | |
437 | |
438 // Do an incremental collection: identify a collection set, and evacuate | |
439 // its live objects elsewhere. | |
440 virtual void do_collection_pause(); | |
441 | |
442 // The guts of the incremental collection pause, executed by the vm | |
677 | 443 // thread. |
444 virtual void do_collection_pause_at_safepoint(); | |
342 | 445 |
446 // Actually do the work of evacuating the collection set. | |
447 virtual void evacuate_collection_set(); | |
448 | |
449 // If this is an appropriate right time, do a collection pause. | |
450 // The "word_size" argument, if non-zero, indicates the size of an | |
451 // allocation request that is prompting this query. | |
452 void do_collection_pause_if_appropriate(size_t word_size); | |
453 | |
454 // The g1 remembered set of the heap. | |
455 G1RemSet* _g1_rem_set; | |
456 // And it's mod ref barrier set, used to track updates for the above. | |
457 ModRefBarrierSet* _mr_bs; | |
458 | |
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459 // A set of cards that cover the objects for which the Rsets should be updated |
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460 // concurrently after the collection. |
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461 DirtyCardQueueSet _dirty_card_queue_set; |
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462 |
342 | 463 // The Heap Region Rem Set Iterator. |
464 HeapRegionRemSetIterator** _rem_set_iterator; | |
465 | |
466 // The closure used to refine a single card. | |
467 RefineCardTableEntryClosure* _refine_cte_cl; | |
468 | |
469 // A function to check the consistency of dirty card logs. | |
470 void check_ct_logs_at_safepoint(); | |
471 | |
472 // After a collection pause, make the regions in the CS into free | |
473 // regions. | |
474 void free_collection_set(HeapRegion* cs_head); | |
475 | |
476 // Applies "scan_non_heap_roots" to roots outside the heap, | |
477 // "scan_rs" to roots inside the heap (having done "set_region" to | |
478 // indicate the region in which the root resides), and does "scan_perm" | |
479 // (setting the generation to the perm generation.) If "scan_rs" is | |
480 // NULL, then this step is skipped. The "worker_i" | |
481 // param is for use with parallel roots processing, and should be | |
482 // the "i" of the calling parallel worker thread's work(i) function. | |
483 // In the sequential case this param will be ignored. | |
484 void g1_process_strong_roots(bool collecting_perm_gen, | |
485 SharedHeap::ScanningOption so, | |
486 OopClosure* scan_non_heap_roots, | |
487 OopsInHeapRegionClosure* scan_rs, | |
488 OopsInHeapRegionClosure* scan_so, | |
489 OopsInGenClosure* scan_perm, | |
490 int worker_i); | |
491 | |
492 void scan_scan_only_set(OopsInHeapRegionClosure* oc, | |
493 int worker_i); | |
494 void scan_scan_only_region(HeapRegion* hr, | |
495 OopsInHeapRegionClosure* oc, | |
496 int worker_i); | |
497 | |
498 // Apply "blk" to all the weak roots of the system. These include | |
499 // JNI weak roots, the code cache, system dictionary, symbol table, | |
500 // string table, and referents of reachable weak refs. | |
501 void g1_process_weak_roots(OopClosure* root_closure, | |
502 OopClosure* non_root_closure); | |
503 | |
504 // Invoke "save_marks" on all heap regions. | |
505 void save_marks(); | |
506 | |
507 // Free a heap region. | |
508 void free_region(HeapRegion* hr); | |
509 // A component of "free_region", exposed for 'batching'. | |
510 // All the params after "hr" are out params: the used bytes of the freed | |
511 // region(s), the number of H regions cleared, the number of regions | |
512 // freed, and pointers to the head and tail of a list of freed contig | |
513 // regions, linked throught the "next_on_unclean_list" field. | |
514 void free_region_work(HeapRegion* hr, | |
515 size_t& pre_used, | |
516 size_t& cleared_h, | |
517 size_t& freed_regions, | |
518 UncleanRegionList* list, | |
519 bool par = false); | |
520 | |
521 | |
522 // The concurrent marker (and the thread it runs in.) | |
523 ConcurrentMark* _cm; | |
524 ConcurrentMarkThread* _cmThread; | |
525 bool _mark_in_progress; | |
526 | |
527 // The concurrent refiner. | |
528 ConcurrentG1Refine* _cg1r; | |
529 | |
530 // The concurrent zero-fill thread. | |
531 ConcurrentZFThread* _czft; | |
532 | |
533 // The parallel task queues | |
534 RefToScanQueueSet *_task_queues; | |
535 | |
536 // True iff a evacuation has failed in the current collection. | |
537 bool _evacuation_failed; | |
538 | |
539 // Set the attribute indicating whether evacuation has failed in the | |
540 // current collection. | |
541 void set_evacuation_failed(bool b) { _evacuation_failed = b; } | |
542 | |
543 // Failed evacuations cause some logical from-space objects to have | |
544 // forwarding pointers to themselves. Reset them. | |
545 void remove_self_forwarding_pointers(); | |
546 | |
547 // When one is non-null, so is the other. Together, they each pair is | |
548 // an object with a preserved mark, and its mark value. | |
549 GrowableArray<oop>* _objs_with_preserved_marks; | |
550 GrowableArray<markOop>* _preserved_marks_of_objs; | |
551 | |
552 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
553 // word being overwritten with a self-forwarding-pointer. | |
554 void preserve_mark_if_necessary(oop obj, markOop m); | |
555 | |
556 // The stack of evac-failure objects left to be scanned. | |
557 GrowableArray<oop>* _evac_failure_scan_stack; | |
558 // The closure to apply to evac-failure objects. | |
559 | |
560 OopsInHeapRegionClosure* _evac_failure_closure; | |
561 // Set the field above. | |
562 void | |
563 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
564 _evac_failure_closure = evac_failure_closure; | |
565 } | |
566 | |
567 // Push "obj" on the scan stack. | |
568 void push_on_evac_failure_scan_stack(oop obj); | |
569 // Process scan stack entries until the stack is empty. | |
570 void drain_evac_failure_scan_stack(); | |
571 // True iff an invocation of "drain_scan_stack" is in progress; to | |
572 // prevent unnecessary recursion. | |
573 bool _drain_in_progress; | |
574 | |
575 // Do any necessary initialization for evacuation-failure handling. | |
576 // "cl" is the closure that will be used to process evac-failure | |
577 // objects. | |
578 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
579 // Do any necessary cleanup for evacuation-failure handling data | |
580 // structures. | |
581 void finalize_for_evac_failure(); | |
582 | |
583 // An attempt to evacuate "obj" has failed; take necessary steps. | |
584 void handle_evacuation_failure(oop obj); | |
585 oop handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, oop obj); | |
586 void handle_evacuation_failure_common(oop obj, markOop m); | |
587 | |
588 | |
589 // Ensure that the relevant gc_alloc regions are set. | |
590 void get_gc_alloc_regions(); | |
636 | 591 // We're done with GC alloc regions. We are going to tear down the |
592 // gc alloc list and remove the gc alloc tag from all the regions on | |
593 // that list. However, we will also retain the last (i.e., the one | |
594 // that is half-full) GC alloc region, per GCAllocPurpose, for | |
595 // possible reuse during the next collection, provided | |
596 // _retain_gc_alloc_region[] indicates that it should be the | |
597 // case. Said regions are kept in the _retained_gc_alloc_regions[] | |
598 // array. If the parameter totally is set, we will not retain any | |
599 // regions, irrespective of what _retain_gc_alloc_region[] | |
600 // indicates. | |
601 void release_gc_alloc_regions(bool totally); | |
602 #ifndef PRODUCT | |
603 // Useful for debugging. | |
604 void print_gc_alloc_regions(); | |
605 #endif // !PRODUCT | |
342 | 606 |
607 // ("Weak") Reference processing support | |
608 ReferenceProcessor* _ref_processor; | |
609 | |
610 enum G1H_process_strong_roots_tasks { | |
611 G1H_PS_mark_stack_oops_do, | |
612 G1H_PS_refProcessor_oops_do, | |
613 // Leave this one last. | |
614 G1H_PS_NumElements | |
615 }; | |
616 | |
617 SubTasksDone* _process_strong_tasks; | |
618 | |
619 // List of regions which require zero filling. | |
620 UncleanRegionList _unclean_region_list; | |
621 bool _unclean_regions_coming; | |
622 | |
623 public: | |
624 void set_refine_cte_cl_concurrency(bool concurrent); | |
625 | |
626 RefToScanQueue *task_queue(int i); | |
627 | |
616
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628 // A set of cards where updates happened during the GC |
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629 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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630 |
342 | 631 // Create a G1CollectedHeap with the specified policy. |
632 // Must call the initialize method afterwards. | |
633 // May not return if something goes wrong. | |
634 G1CollectedHeap(G1CollectorPolicy* policy); | |
635 | |
636 // Initialize the G1CollectedHeap to have the initial and | |
637 // maximum sizes, permanent generation, and remembered and barrier sets | |
638 // specified by the policy object. | |
639 jint initialize(); | |
640 | |
641 void ref_processing_init(); | |
642 | |
643 void set_par_threads(int t) { | |
644 SharedHeap::set_par_threads(t); | |
645 _process_strong_tasks->set_par_threads(t); | |
646 } | |
647 | |
648 virtual CollectedHeap::Name kind() const { | |
649 return CollectedHeap::G1CollectedHeap; | |
650 } | |
651 | |
652 // The current policy object for the collector. | |
653 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
654 | |
655 // Adaptive size policy. No such thing for g1. | |
656 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
657 | |
658 // The rem set and barrier set. | |
659 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
660 ModRefBarrierSet* mr_bs() const { return _mr_bs; } | |
661 | |
662 // The rem set iterator. | |
663 HeapRegionRemSetIterator* rem_set_iterator(int i) { | |
664 return _rem_set_iterator[i]; | |
665 } | |
666 | |
667 HeapRegionRemSetIterator* rem_set_iterator() { | |
668 return _rem_set_iterator[0]; | |
669 } | |
670 | |
671 unsigned get_gc_time_stamp() { | |
672 return _gc_time_stamp; | |
673 } | |
674 | |
675 void reset_gc_time_stamp() { | |
676 _gc_time_stamp = 0; | |
353
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677 OrderAccess::fence(); |
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678 } |
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679 |
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680 void increment_gc_time_stamp() { |
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681 ++_gc_time_stamp; |
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682 OrderAccess::fence(); |
342 | 683 } |
684 | |
685 void iterate_dirty_card_closure(bool concurrent, int worker_i); | |
686 | |
687 // The shared block offset table array. | |
688 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
689 | |
690 // Reference Processing accessor | |
691 ReferenceProcessor* ref_processor() { return _ref_processor; } | |
692 | |
693 // Reserved (g1 only; super method includes perm), capacity and the used | |
694 // portion in bytes. | |
1092
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695 size_t g1_reserved_obj_bytes() const { return _g1_reserved.byte_size(); } |
342 | 696 virtual size_t capacity() const; |
697 virtual size_t used() const; | |
846
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698 // This should be called when we're not holding the heap lock. The |
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699 // result might be a bit inaccurate. |
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700 size_t used_unlocked() const; |
342 | 701 size_t recalculate_used() const; |
702 #ifndef PRODUCT | |
703 size_t recalculate_used_regions() const; | |
704 #endif // PRODUCT | |
705 | |
706 // These virtual functions do the actual allocation. | |
707 virtual HeapWord* mem_allocate(size_t word_size, | |
708 bool is_noref, | |
709 bool is_tlab, | |
710 bool* gc_overhead_limit_was_exceeded); | |
711 | |
712 // Some heaps may offer a contiguous region for shared non-blocking | |
713 // allocation, via inlined code (by exporting the address of the top and | |
714 // end fields defining the extent of the contiguous allocation region.) | |
715 // But G1CollectedHeap doesn't yet support this. | |
716 | |
717 // Return an estimate of the maximum allocation that could be performed | |
718 // without triggering any collection or expansion activity. In a | |
719 // generational collector, for example, this is probably the largest | |
720 // allocation that could be supported (without expansion) in the youngest | |
721 // generation. It is "unsafe" because no locks are taken; the result | |
722 // should be treated as an approximation, not a guarantee, for use in | |
723 // heuristic resizing decisions. | |
724 virtual size_t unsafe_max_alloc(); | |
725 | |
726 virtual bool is_maximal_no_gc() const { | |
727 return _g1_storage.uncommitted_size() == 0; | |
728 } | |
729 | |
730 // The total number of regions in the heap. | |
731 size_t n_regions(); | |
732 | |
733 // The number of regions that are completely free. | |
734 size_t max_regions(); | |
735 | |
736 // The number of regions that are completely free. | |
737 size_t free_regions(); | |
738 | |
739 // The number of regions that are not completely free. | |
740 size_t used_regions() { return n_regions() - free_regions(); } | |
741 | |
742 // True iff the ZF thread should run. | |
743 bool should_zf(); | |
744 | |
745 // The number of regions available for "regular" expansion. | |
746 size_t expansion_regions() { return _expansion_regions; } | |
747 | |
748 #ifndef PRODUCT | |
749 bool regions_accounted_for(); | |
750 bool print_region_accounting_info(); | |
751 void print_region_counts(); | |
752 #endif | |
753 | |
754 HeapRegion* alloc_region_from_unclean_list(bool zero_filled); | |
755 HeapRegion* alloc_region_from_unclean_list_locked(bool zero_filled); | |
756 | |
757 void put_region_on_unclean_list(HeapRegion* r); | |
758 void put_region_on_unclean_list_locked(HeapRegion* r); | |
759 | |
760 void prepend_region_list_on_unclean_list(UncleanRegionList* list); | |
761 void prepend_region_list_on_unclean_list_locked(UncleanRegionList* list); | |
762 | |
763 void set_unclean_regions_coming(bool b); | |
764 void set_unclean_regions_coming_locked(bool b); | |
765 // Wait for cleanup to be complete. | |
766 void wait_for_cleanup_complete(); | |
767 // Like above, but assumes that the calling thread owns the Heap_lock. | |
768 void wait_for_cleanup_complete_locked(); | |
769 | |
770 // Return the head of the unclean list. | |
771 HeapRegion* peek_unclean_region_list_locked(); | |
772 // Remove and return the head of the unclean list. | |
773 HeapRegion* pop_unclean_region_list_locked(); | |
774 | |
775 // List of regions which are zero filled and ready for allocation. | |
776 HeapRegion* _free_region_list; | |
777 // Number of elements on the free list. | |
778 size_t _free_region_list_size; | |
779 | |
780 // If the head of the unclean list is ZeroFilled, move it to the free | |
781 // list. | |
782 bool move_cleaned_region_to_free_list_locked(); | |
783 bool move_cleaned_region_to_free_list(); | |
784 | |
785 void put_free_region_on_list_locked(HeapRegion* r); | |
786 void put_free_region_on_list(HeapRegion* r); | |
787 | |
788 // Remove and return the head element of the free list. | |
789 HeapRegion* pop_free_region_list_locked(); | |
790 | |
791 // If "zero_filled" is true, we first try the free list, then we try the | |
792 // unclean list, zero-filling the result. If "zero_filled" is false, we | |
793 // first try the unclean list, then the zero-filled list. | |
794 HeapRegion* alloc_free_region_from_lists(bool zero_filled); | |
795 | |
796 // Verify the integrity of the region lists. | |
797 void remove_allocated_regions_from_lists(); | |
798 bool verify_region_lists(); | |
799 bool verify_region_lists_locked(); | |
800 size_t unclean_region_list_length(); | |
801 size_t free_region_list_length(); | |
802 | |
803 // Perform a collection of the heap; intended for use in implementing | |
804 // "System.gc". This probably implies as full a collection as the | |
805 // "CollectedHeap" supports. | |
806 virtual void collect(GCCause::Cause cause); | |
807 | |
808 // The same as above but assume that the caller holds the Heap_lock. | |
809 void collect_locked(GCCause::Cause cause); | |
810 | |
811 // This interface assumes that it's being called by the | |
812 // vm thread. It collects the heap assuming that the | |
813 // heap lock is already held and that we are executing in | |
814 // the context of the vm thread. | |
815 virtual void collect_as_vm_thread(GCCause::Cause cause); | |
816 | |
817 // True iff a evacuation has failed in the most-recent collection. | |
818 bool evacuation_failed() { return _evacuation_failed; } | |
819 | |
820 // Free a region if it is totally full of garbage. Returns the number of | |
821 // bytes freed (0 ==> didn't free it). | |
822 size_t free_region_if_totally_empty(HeapRegion *hr); | |
823 void free_region_if_totally_empty_work(HeapRegion *hr, | |
824 size_t& pre_used, | |
825 size_t& cleared_h_regions, | |
826 size_t& freed_regions, | |
827 UncleanRegionList* list, | |
828 bool par = false); | |
829 | |
830 // If we've done free region work that yields the given changes, update | |
831 // the relevant global variables. | |
832 void finish_free_region_work(size_t pre_used, | |
833 size_t cleared_h_regions, | |
834 size_t freed_regions, | |
835 UncleanRegionList* list); | |
836 | |
837 | |
838 // Returns "TRUE" iff "p" points into the allocated area of the heap. | |
839 virtual bool is_in(const void* p) const; | |
840 | |
841 // Return "TRUE" iff the given object address is within the collection | |
842 // set. | |
843 inline bool obj_in_cs(oop obj); | |
844 | |
845 // Return "TRUE" iff the given object address is in the reserved | |
846 // region of g1 (excluding the permanent generation). | |
847 bool is_in_g1_reserved(const void* p) const { | |
848 return _g1_reserved.contains(p); | |
849 } | |
850 | |
851 // Returns a MemRegion that corresponds to the space that has been | |
852 // committed in the heap | |
853 MemRegion g1_committed() { | |
854 return _g1_committed; | |
855 } | |
856 | |
941 | 857 NOT_PRODUCT(bool is_in_closed_subset(const void* p) const;) |
342 | 858 |
859 // Dirty card table entries covering a list of young regions. | |
860 void dirtyCardsForYoungRegions(CardTableModRefBS* ct_bs, HeapRegion* list); | |
861 | |
862 // This resets the card table to all zeros. It is used after | |
863 // a collection pause which used the card table to claim cards. | |
864 void cleanUpCardTable(); | |
865 | |
866 // Iteration functions. | |
867 | |
868 // Iterate over all the ref-containing fields of all objects, calling | |
869 // "cl.do_oop" on each. | |
678 | 870 virtual void oop_iterate(OopClosure* cl) { |
871 oop_iterate(cl, true); | |
872 } | |
873 void oop_iterate(OopClosure* cl, bool do_perm); | |
342 | 874 |
875 // Same as above, restricted to a memory region. | |
678 | 876 virtual void oop_iterate(MemRegion mr, OopClosure* cl) { |
877 oop_iterate(mr, cl, true); | |
878 } | |
879 void oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm); | |
342 | 880 |
881 // Iterate over all objects, calling "cl.do_object" on each. | |
678 | 882 virtual void object_iterate(ObjectClosure* cl) { |
883 object_iterate(cl, true); | |
884 } | |
885 virtual void safe_object_iterate(ObjectClosure* cl) { | |
886 object_iterate(cl, true); | |
887 } | |
888 void object_iterate(ObjectClosure* cl, bool do_perm); | |
342 | 889 |
890 // Iterate over all objects allocated since the last collection, calling | |
891 // "cl.do_object" on each. The heap must have been initialized properly | |
892 // to support this function, or else this call will fail. | |
893 virtual void object_iterate_since_last_GC(ObjectClosure* cl); | |
894 | |
895 // Iterate over all spaces in use in the heap, in ascending address order. | |
896 virtual void space_iterate(SpaceClosure* cl); | |
897 | |
898 // Iterate over heap regions, in address order, terminating the | |
899 // iteration early if the "doHeapRegion" method returns "true". | |
900 void heap_region_iterate(HeapRegionClosure* blk); | |
901 | |
902 // Iterate over heap regions starting with r (or the first region if "r" | |
903 // is NULL), in address order, terminating early if the "doHeapRegion" | |
904 // method returns "true". | |
905 void heap_region_iterate_from(HeapRegion* r, HeapRegionClosure* blk); | |
906 | |
907 // As above but starting from the region at index idx. | |
908 void heap_region_iterate_from(int idx, HeapRegionClosure* blk); | |
909 | |
910 HeapRegion* region_at(size_t idx); | |
911 | |
912 // Divide the heap region sequence into "chunks" of some size (the number | |
913 // of regions divided by the number of parallel threads times some | |
914 // overpartition factor, currently 4). Assumes that this will be called | |
915 // in parallel by ParallelGCThreads worker threads with discinct worker | |
916 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
917 // calls will use the same "claim_value", and that that claim value is | |
918 // different from the claim_value of any heap region before the start of | |
919 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
920 // attempting to claim the first region in each chunk, and, if | |
921 // successful, applying the closure to each region in the chunk (and | |
922 // setting the claim value of the second and subsequent regions of the | |
923 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
924 // i.e., that a closure never attempt to abort a traversal. | |
925 void heap_region_par_iterate_chunked(HeapRegionClosure* blk, | |
926 int worker, | |
927 jint claim_value); | |
928 | |
390 | 929 // It resets all the region claim values to the default. |
930 void reset_heap_region_claim_values(); | |
931 | |
355 | 932 #ifdef ASSERT |
933 bool check_heap_region_claim_values(jint claim_value); | |
934 #endif // ASSERT | |
935 | |
342 | 936 // Iterate over the regions (if any) in the current collection set. |
937 void collection_set_iterate(HeapRegionClosure* blk); | |
938 | |
939 // As above but starting from region r | |
940 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
941 | |
942 // Returns the first (lowest address) compactible space in the heap. | |
943 virtual CompactibleSpace* first_compactible_space(); | |
944 | |
945 // A CollectedHeap will contain some number of spaces. This finds the | |
946 // space containing a given address, or else returns NULL. | |
947 virtual Space* space_containing(const void* addr) const; | |
948 | |
949 // A G1CollectedHeap will contain some number of heap regions. This | |
950 // finds the region containing a given address, or else returns NULL. | |
951 HeapRegion* heap_region_containing(const void* addr) const; | |
952 | |
953 // Like the above, but requires "addr" to be in the heap (to avoid a | |
954 // null-check), and unlike the above, may return an continuing humongous | |
955 // region. | |
956 HeapRegion* heap_region_containing_raw(const void* addr) const; | |
957 | |
958 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
959 // each address in the (reserved) heap is a member of exactly | |
960 // one block. The defining characteristic of a block is that it is | |
961 // possible to find its size, and thus to progress forward to the next | |
962 // block. (Blocks may be of different sizes.) Thus, blocks may | |
963 // represent Java objects, or they might be free blocks in a | |
964 // free-list-based heap (or subheap), as long as the two kinds are | |
965 // distinguishable and the size of each is determinable. | |
966 | |
967 // Returns the address of the start of the "block" that contains the | |
968 // address "addr". We say "blocks" instead of "object" since some heaps | |
969 // may not pack objects densely; a chunk may either be an object or a | |
970 // non-object. | |
971 virtual HeapWord* block_start(const void* addr) const; | |
972 | |
973 // Requires "addr" to be the start of a chunk, and returns its size. | |
974 // "addr + size" is required to be the start of a new chunk, or the end | |
975 // of the active area of the heap. | |
976 virtual size_t block_size(const HeapWord* addr) const; | |
977 | |
978 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
979 // the block is an object. | |
980 virtual bool block_is_obj(const HeapWord* addr) const; | |
981 | |
982 // Does this heap support heap inspection? (+PrintClassHistogram) | |
983 virtual bool supports_heap_inspection() const { return true; } | |
984 | |
985 // Section on thread-local allocation buffers (TLABs) | |
986 // See CollectedHeap for semantics. | |
987 | |
988 virtual bool supports_tlab_allocation() const; | |
989 virtual size_t tlab_capacity(Thread* thr) const; | |
990 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; | |
991 virtual HeapWord* allocate_new_tlab(size_t size); | |
992 | |
993 // Can a compiler initialize a new object without store barriers? | |
994 // This permission only extends from the creation of a new object | |
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995 // via a TLAB up to the first subsequent safepoint. If such permission |
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996 // is granted for this heap type, the compiler promises to call |
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997 // defer_store_barrier() below on any slow path allocation of |
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998 // a new object for which such initializing store barriers will |
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999 // have been elided. G1, like CMS, allows this, but should be |
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1000 // ready to provide a compensating write barrier as necessary |
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1001 // if that storage came out of a non-young region. The efficiency |
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1002 // of this implementation depends crucially on being able to |
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1003 // answer very efficiently in constant time whether a piece of |
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1004 // storage in the heap comes from a young region or not. |
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1005 // See ReduceInitialCardMarks. |
342 | 1006 virtual bool can_elide_tlab_store_barriers() const { |
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1007 // 6920090: Temporarily disabled, because of lingering |
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1008 // instabilities related to RICM with G1. In the |
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1009 // interim, the option ReduceInitialCardMarksForG1 |
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1010 // below is left solely as a debugging device at least |
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1011 // until 6920109 fixes the instabilities. |
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1012 return ReduceInitialCardMarksForG1; |
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1013 } |
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1014 |
1166 | 1015 virtual bool card_mark_must_follow_store() const { |
1016 return true; | |
1017 } | |
1018 | |
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1019 bool is_in_young(oop obj) { |
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1020 HeapRegion* hr = heap_region_containing(obj); |
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1021 return hr != NULL && hr->is_young(); |
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1022 } |
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1023 |
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1024 // We don't need barriers for initializing stores to objects |
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1025 // in the young gen: for the SATB pre-barrier, there is no |
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1026 // pre-value that needs to be remembered; for the remembered-set |
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1027 // update logging post-barrier, we don't maintain remembered set |
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1028 // information for young gen objects. Note that non-generational |
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1029 // G1 does not have any "young" objects, should not elide |
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1030 // the rs logging barrier and so should always answer false below. |
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1031 // However, non-generational G1 (-XX:-G1Gen) appears to have |
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1032 // bit-rotted so was not tested below. |
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1033 virtual bool can_elide_initializing_store_barrier(oop new_obj) { |
1194
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1034 // Re 6920090, 6920109 above. |
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1035 assert(ReduceInitialCardMarksForG1, "Else cannot be here"); |
1027
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1036 assert(G1Gen || !is_in_young(new_obj), |
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1037 "Non-generational G1 should never return true below"); |
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1038 return is_in_young(new_obj); |
342 | 1039 } |
1040 | |
1041 // Can a compiler elide a store barrier when it writes | |
1042 // a permanent oop into the heap? Applies when the compiler | |
1043 // is storing x to the heap, where x->is_perm() is true. | |
1044 virtual bool can_elide_permanent_oop_store_barriers() const { | |
1045 // At least until perm gen collection is also G1-ified, at | |
1046 // which point this should return false. | |
1047 return true; | |
1048 } | |
1049 | |
1050 virtual bool allocs_are_zero_filled(); | |
1051 | |
1052 // The boundary between a "large" and "small" array of primitives, in | |
1053 // words. | |
1054 virtual size_t large_typearray_limit(); | |
1055 | |
1056 // Returns "true" iff the given word_size is "very large". | |
1057 static bool isHumongous(size_t word_size) { | |
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1058 // Note this has to be strictly greater-than as the TLABs |
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1059 // are capped at the humongous thresold and we want to |
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1060 // ensure that we don't try to allocate a TLAB as |
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1061 // humongous and that we don't allocate a humongous |
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1062 // object in a TLAB. |
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1063 return word_size > _humongous_object_threshold_in_words; |
342 | 1064 } |
1065 | |
1066 // Update mod union table with the set of dirty cards. | |
1067 void updateModUnion(); | |
1068 | |
1069 // Set the mod union bits corresponding to the given memRegion. Note | |
1070 // that this is always a safe operation, since it doesn't clear any | |
1071 // bits. | |
1072 void markModUnionRange(MemRegion mr); | |
1073 | |
1074 // Records the fact that a marking phase is no longer in progress. | |
1075 void set_marking_complete() { | |
1076 _mark_in_progress = false; | |
1077 } | |
1078 void set_marking_started() { | |
1079 _mark_in_progress = true; | |
1080 } | |
1081 bool mark_in_progress() { | |
1082 return _mark_in_progress; | |
1083 } | |
1084 | |
1085 // Print the maximum heap capacity. | |
1086 virtual size_t max_capacity() const; | |
1087 | |
1088 virtual jlong millis_since_last_gc(); | |
1089 | |
1090 // Perform any cleanup actions necessary before allowing a verification. | |
1091 virtual void prepare_for_verify(); | |
1092 | |
1093 // Perform verification. | |
811 | 1094 |
1095 // use_prev_marking == true -> use "prev" marking information, | |
1096 // use_prev_marking == false -> use "next" marking information | |
1097 // NOTE: Only the "prev" marking information is guaranteed to be | |
1098 // consistent most of the time, so most calls to this should use | |
1099 // use_prev_marking == true. Currently, there is only one case where | |
1100 // this is called with use_prev_marking == false, which is to verify | |
1101 // the "next" marking information at the end of remark. | |
1102 void verify(bool allow_dirty, bool silent, bool use_prev_marking); | |
1103 | |
1104 // Override; it uses the "prev" marking information | |
342 | 1105 virtual void verify(bool allow_dirty, bool silent); |
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1106 // Default behavior by calling print(tty); |
342 | 1107 virtual void print() const; |
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1108 // This calls print_on(st, PrintHeapAtGCExtended). |
342 | 1109 virtual void print_on(outputStream* st) const; |
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1110 // If extended is true, it will print out information for all |
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1111 // regions in the heap by calling print_on_extended(st). |
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1112 virtual void print_on(outputStream* st, bool extended) const; |
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1113 virtual void print_on_extended(outputStream* st) const; |
342 | 1114 |
1115 virtual void print_gc_threads_on(outputStream* st) const; | |
1116 virtual void gc_threads_do(ThreadClosure* tc) const; | |
1117 | |
1118 // Override | |
1119 void print_tracing_info() const; | |
1120 | |
1121 // If "addr" is a pointer into the (reserved?) heap, returns a positive | |
1122 // number indicating the "arena" within the heap in which "addr" falls. | |
1123 // Or else returns 0. | |
1124 virtual int addr_to_arena_id(void* addr) const; | |
1125 | |
1126 // Convenience function to be used in situations where the heap type can be | |
1127 // asserted to be this type. | |
1128 static G1CollectedHeap* heap(); | |
1129 | |
1130 void empty_young_list(); | |
1131 bool should_set_young_locked(); | |
1132 | |
1133 void set_region_short_lived_locked(HeapRegion* hr); | |
1134 // add appropriate methods for any other surv rate groups | |
1135 | |
1136 void young_list_rs_length_sampling_init() { | |
1137 _young_list->rs_length_sampling_init(); | |
1138 } | |
1139 bool young_list_rs_length_sampling_more() { | |
1140 return _young_list->rs_length_sampling_more(); | |
1141 } | |
1142 void young_list_rs_length_sampling_next() { | |
1143 _young_list->rs_length_sampling_next(); | |
1144 } | |
1145 size_t young_list_sampled_rs_lengths() { | |
1146 return _young_list->sampled_rs_lengths(); | |
1147 } | |
1148 | |
1149 size_t young_list_length() { return _young_list->length(); } | |
1150 size_t young_list_scan_only_length() { | |
1151 return _young_list->scan_only_length(); } | |
1152 | |
1153 HeapRegion* pop_region_from_young_list() { | |
1154 return _young_list->pop_region(); | |
1155 } | |
1156 | |
1157 HeapRegion* young_list_first_region() { | |
1158 return _young_list->first_region(); | |
1159 } | |
1160 | |
1161 // debugging | |
1162 bool check_young_list_well_formed() { | |
1163 return _young_list->check_list_well_formed(); | |
1164 } | |
1165 bool check_young_list_empty(bool ignore_scan_only_list, | |
1166 bool check_sample = true); | |
1167 | |
1168 // *** Stuff related to concurrent marking. It's not clear to me that so | |
1169 // many of these need to be public. | |
1170 | |
1171 // The functions below are helper functions that a subclass of | |
1172 // "CollectedHeap" can use in the implementation of its virtual | |
1173 // functions. | |
1174 // This performs a concurrent marking of the live objects in a | |
1175 // bitmap off to the side. | |
1176 void doConcurrentMark(); | |
1177 | |
1178 // This is called from the marksweep collector which then does | |
1179 // a concurrent mark and verifies that the results agree with | |
1180 // the stop the world marking. | |
1181 void checkConcurrentMark(); | |
1182 void do_sync_mark(); | |
1183 | |
1184 bool isMarkedPrev(oop obj) const; | |
1185 bool isMarkedNext(oop obj) const; | |
1186 | |
811 | 1187 // use_prev_marking == true -> use "prev" marking information, |
1188 // use_prev_marking == false -> use "next" marking information | |
1189 bool is_obj_dead_cond(const oop obj, | |
1190 const HeapRegion* hr, | |
1191 const bool use_prev_marking) const { | |
1192 if (use_prev_marking) { | |
1193 return is_obj_dead(obj, hr); | |
1194 } else { | |
1195 return is_obj_ill(obj, hr); | |
1196 } | |
1197 } | |
1198 | |
342 | 1199 // Determine if an object is dead, given the object and also |
1200 // the region to which the object belongs. An object is dead | |
1201 // iff a) it was not allocated since the last mark and b) it | |
1202 // is not marked. | |
1203 | |
1204 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
1205 return | |
1206 !hr->obj_allocated_since_prev_marking(obj) && | |
1207 !isMarkedPrev(obj); | |
1208 } | |
1209 | |
1210 // This is used when copying an object to survivor space. | |
1211 // If the object is marked live, then we mark the copy live. | |
1212 // If the object is allocated since the start of this mark | |
1213 // cycle, then we mark the copy live. | |
1214 // If the object has been around since the previous mark | |
1215 // phase, and hasn't been marked yet during this phase, | |
1216 // then we don't mark it, we just wait for the | |
1217 // current marking cycle to get to it. | |
1218 | |
1219 // This function returns true when an object has been | |
1220 // around since the previous marking and hasn't yet | |
1221 // been marked during this marking. | |
1222 | |
1223 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
1224 return | |
1225 !hr->obj_allocated_since_next_marking(obj) && | |
1226 !isMarkedNext(obj); | |
1227 } | |
1228 | |
1229 // Determine if an object is dead, given only the object itself. | |
1230 // This will find the region to which the object belongs and | |
1231 // then call the region version of the same function. | |
1232 | |
1233 // Added if it is in permanent gen it isn't dead. | |
1234 // Added if it is NULL it isn't dead. | |
1235 | |
811 | 1236 // use_prev_marking == true -> use "prev" marking information, |
1237 // use_prev_marking == false -> use "next" marking information | |
1238 bool is_obj_dead_cond(const oop obj, | |
1239 const bool use_prev_marking) { | |
1240 if (use_prev_marking) { | |
1241 return is_obj_dead(obj); | |
1242 } else { | |
1243 return is_obj_ill(obj); | |
1244 } | |
1245 } | |
1246 | |
1247 bool is_obj_dead(const oop obj) { | |
1248 const HeapRegion* hr = heap_region_containing(obj); | |
342 | 1249 if (hr == NULL) { |
1250 if (Universe::heap()->is_in_permanent(obj)) | |
1251 return false; | |
1252 else if (obj == NULL) return false; | |
1253 else return true; | |
1254 } | |
1255 else return is_obj_dead(obj, hr); | |
1256 } | |
1257 | |
811 | 1258 bool is_obj_ill(const oop obj) { |
1259 const HeapRegion* hr = heap_region_containing(obj); | |
342 | 1260 if (hr == NULL) { |
1261 if (Universe::heap()->is_in_permanent(obj)) | |
1262 return false; | |
1263 else if (obj == NULL) return false; | |
1264 else return true; | |
1265 } | |
1266 else return is_obj_ill(obj, hr); | |
1267 } | |
1268 | |
1269 // The following is just to alert the verification code | |
1270 // that a full collection has occurred and that the | |
1271 // remembered sets are no longer up to date. | |
1272 bool _full_collection; | |
1273 void set_full_collection() { _full_collection = true;} | |
1274 void clear_full_collection() {_full_collection = false;} | |
1275 bool full_collection() {return _full_collection;} | |
1276 | |
1277 ConcurrentMark* concurrent_mark() const { return _cm; } | |
1278 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
1279 | |
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1280 // The dirty cards region list is used to record a subset of regions |
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1281 // whose cards need clearing. The list if populated during the |
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1282 // remembered set scanning and drained during the card table |
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1283 // cleanup. Although the methods are reentrant, population/draining |
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1284 // phases must not overlap. For synchronization purposes the last |
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1285 // element on the list points to itself. |
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1286 HeapRegion* _dirty_cards_region_list; |
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1287 void push_dirty_cards_region(HeapRegion* hr); |
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1288 HeapRegion* pop_dirty_cards_region(); |
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1289 |
342 | 1290 public: |
1291 void stop_conc_gc_threads(); | |
1292 | |
1293 // <NEW PREDICTION> | |
1294 | |
1295 double predict_region_elapsed_time_ms(HeapRegion* hr, bool young); | |
1296 void check_if_region_is_too_expensive(double predicted_time_ms); | |
1297 size_t pending_card_num(); | |
1298 size_t max_pending_card_num(); | |
1299 size_t cards_scanned(); | |
1300 | |
1301 // </NEW PREDICTION> | |
1302 | |
1303 protected: | |
1304 size_t _max_heap_capacity; | |
1305 | |
1306 // debug_only(static void check_for_valid_allocation_state();) | |
1307 | |
1308 public: | |
1309 // Temporary: call to mark things unimplemented for the G1 heap (e.g., | |
1310 // MemoryService). In productization, we can make this assert false | |
1311 // to catch such places (as well as searching for calls to this...) | |
1312 static void g1_unimplemented(); | |
1313 | |
1314 }; | |
1315 | |
845
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1316 #define use_local_bitmaps 1 |
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1317 #define verify_local_bitmaps 0 |
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1318 #define oop_buffer_length 256 |
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1319 |
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1320 #ifndef PRODUCT |
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1321 class GCLabBitMap; |
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1322 class GCLabBitMapClosure: public BitMapClosure { |
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1323 private: |
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1324 ConcurrentMark* _cm; |
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1325 GCLabBitMap* _bitmap; |
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1326 |
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1327 public: |
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1328 GCLabBitMapClosure(ConcurrentMark* cm, |
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1329 GCLabBitMap* bitmap) { |
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1330 _cm = cm; |
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1331 _bitmap = bitmap; |
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1332 } |
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1333 |
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1334 virtual bool do_bit(size_t offset); |
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1335 }; |
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1336 #endif // !PRODUCT |
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1337 |
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1338 class GCLabBitMap: public BitMap { |
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1339 private: |
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1340 ConcurrentMark* _cm; |
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1341 |
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1342 int _shifter; |
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1343 size_t _bitmap_word_covers_words; |
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1344 |
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1345 // beginning of the heap |
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1346 HeapWord* _heap_start; |
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1347 |
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1348 // this is the actual start of the GCLab |
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1349 HeapWord* _real_start_word; |
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1350 |
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1351 // this is the actual end of the GCLab |
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1352 HeapWord* _real_end_word; |
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1353 |
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1354 // this is the first word, possibly located before the actual start |
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1355 // of the GCLab, that corresponds to the first bit of the bitmap |
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1356 HeapWord* _start_word; |
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1357 |
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1358 // size of a GCLab in words |
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1359 size_t _gclab_word_size; |
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1360 |
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1361 static int shifter() { |
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1362 return MinObjAlignment - 1; |
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1363 } |
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1364 |
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1365 // how many heap words does a single bitmap word corresponds to? |
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1366 static size_t bitmap_word_covers_words() { |
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1367 return BitsPerWord << shifter(); |
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1368 } |
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1369 |
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1370 static size_t gclab_word_size() { |
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1371 return G1ParallelGCAllocBufferSize / HeapWordSize; |
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1372 } |
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1373 |
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1374 static size_t bitmap_size_in_bits() { |
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1375 size_t bits_in_bitmap = gclab_word_size() >> shifter(); |
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1376 // We are going to ensure that the beginning of a word in this |
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1377 // bitmap also corresponds to the beginning of a word in the |
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1378 // global marking bitmap. To handle the case where a GCLab |
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1379 // starts from the middle of the bitmap, we need to add enough |
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1380 // space (i.e. up to a bitmap word) to ensure that we have |
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1381 // enough bits in the bitmap. |
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1382 return bits_in_bitmap + BitsPerWord - 1; |
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1383 } |
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1384 public: |
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1385 GCLabBitMap(HeapWord* heap_start) |
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1386 : BitMap(bitmap_size_in_bits()), |
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1387 _cm(G1CollectedHeap::heap()->concurrent_mark()), |
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1388 _shifter(shifter()), |
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1389 _bitmap_word_covers_words(bitmap_word_covers_words()), |
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1390 _heap_start(heap_start), |
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1391 _gclab_word_size(gclab_word_size()), |
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1392 _real_start_word(NULL), |
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1393 _real_end_word(NULL), |
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1394 _start_word(NULL) |
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1395 { |
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1396 guarantee( size_in_words() >= bitmap_size_in_words(), |
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1397 "just making sure"); |
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1398 } |
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1399 |
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1400 inline unsigned heapWordToOffset(HeapWord* addr) { |
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1401 unsigned offset = (unsigned) pointer_delta(addr, _start_word) >> _shifter; |
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1402 assert(offset < size(), "offset should be within bounds"); |
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1403 return offset; |
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1404 } |
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1405 |
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1406 inline HeapWord* offsetToHeapWord(size_t offset) { |
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1407 HeapWord* addr = _start_word + (offset << _shifter); |
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1408 assert(_real_start_word <= addr && addr < _real_end_word, "invariant"); |
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1409 return addr; |
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1410 } |
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1411 |
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1412 bool fields_well_formed() { |
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1413 bool ret1 = (_real_start_word == NULL) && |
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1414 (_real_end_word == NULL) && |
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1415 (_start_word == NULL); |
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1416 if (ret1) |
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1417 return true; |
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1418 |
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1419 bool ret2 = _real_start_word >= _start_word && |
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1420 _start_word < _real_end_word && |
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1421 (_real_start_word + _gclab_word_size) == _real_end_word && |
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1422 (_start_word + _gclab_word_size + _bitmap_word_covers_words) |
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1423 > _real_end_word; |
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1424 return ret2; |
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1425 } |
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1426 |
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1427 inline bool mark(HeapWord* addr) { |
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1428 guarantee(use_local_bitmaps, "invariant"); |
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1429 assert(fields_well_formed(), "invariant"); |
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1430 |
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1431 if (addr >= _real_start_word && addr < _real_end_word) { |
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1432 assert(!isMarked(addr), "should not have already been marked"); |
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1433 |
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1434 // first mark it on the bitmap |
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1435 at_put(heapWordToOffset(addr), true); |
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1436 |
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1437 return true; |
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1438 } else { |
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1439 return false; |
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1440 } |
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1441 } |
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1442 |
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|
1443 inline bool isMarked(HeapWord* addr) { |
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1444 guarantee(use_local_bitmaps, "invariant"); |
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1445 assert(fields_well_formed(), "invariant"); |
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1446 |
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1447 return at(heapWordToOffset(addr)); |
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1448 } |
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1449 |
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1450 void set_buffer(HeapWord* start) { |
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1451 guarantee(use_local_bitmaps, "invariant"); |
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|
1452 clear(); |
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|
1453 |
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|
1454 assert(start != NULL, "invariant"); |
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1455 _real_start_word = start; |
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1456 _real_end_word = start + _gclab_word_size; |
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1457 |
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1458 size_t diff = |
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1459 pointer_delta(start, _heap_start) % _bitmap_word_covers_words; |
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1460 _start_word = start - diff; |
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1461 |
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1462 assert(fields_well_formed(), "invariant"); |
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1463 } |
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1464 |
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1465 #ifndef PRODUCT |
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1466 void verify() { |
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1467 // verify that the marks have been propagated |
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1468 GCLabBitMapClosure cl(_cm, this); |
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|
1469 iterate(&cl); |
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1470 } |
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1471 #endif // PRODUCT |
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1472 |
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1473 void retire() { |
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1474 guarantee(use_local_bitmaps, "invariant"); |
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1475 assert(fields_well_formed(), "invariant"); |
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1476 |
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1477 if (_start_word != NULL) { |
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1478 CMBitMap* mark_bitmap = _cm->nextMarkBitMap(); |
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1479 |
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1480 // this means that the bitmap was set up for the GCLab |
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1481 assert(_real_start_word != NULL && _real_end_word != NULL, "invariant"); |
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1482 |
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1483 mark_bitmap->mostly_disjoint_range_union(this, |
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1484 0, // always start from the start of the bitmap |
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1485 _start_word, |
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1486 size_in_words()); |
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1487 _cm->grayRegionIfNecessary(MemRegion(_real_start_word, _real_end_word)); |
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1488 |
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|
1489 #ifndef PRODUCT |
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1490 if (use_local_bitmaps && verify_local_bitmaps) |
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|
1491 verify(); |
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1492 #endif // PRODUCT |
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1493 } else { |
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1494 assert(_real_start_word == NULL && _real_end_word == NULL, "invariant"); |
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1495 } |
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1496 } |
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|
1497 |
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1498 static size_t bitmap_size_in_words() { |
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1499 return (bitmap_size_in_bits() + BitsPerWord - 1) / BitsPerWord; |
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1500 } |
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1501 }; |
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|
1502 |
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1503 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
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1504 private: |
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|
1505 bool _retired; |
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|
1506 bool _during_marking; |
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|
1507 GCLabBitMap _bitmap; |
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|
1508 |
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|
1509 public: |
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|
1510 G1ParGCAllocBuffer() : |
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1511 ParGCAllocBuffer(G1ParallelGCAllocBufferSize / HeapWordSize), |
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1512 _during_marking(G1CollectedHeap::heap()->mark_in_progress()), |
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1513 _bitmap(G1CollectedHeap::heap()->reserved_region().start()), |
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|
1514 _retired(false) |
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|
1515 { } |
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|
1516 |
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|
1517 inline bool mark(HeapWord* addr) { |
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|
1518 guarantee(use_local_bitmaps, "invariant"); |
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|
1519 assert(_during_marking, "invariant"); |
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|
1520 return _bitmap.mark(addr); |
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|
1521 } |
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|
1522 |
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|
1523 inline void set_buf(HeapWord* buf) { |
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1524 if (use_local_bitmaps && _during_marking) |
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|
1525 _bitmap.set_buffer(buf); |
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|
1526 ParGCAllocBuffer::set_buf(buf); |
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|
1527 _retired = false; |
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|
1528 } |
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|
1529 |
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|
1530 inline void retire(bool end_of_gc, bool retain) { |
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|
1531 if (_retired) |
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|
1532 return; |
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|
1533 if (use_local_bitmaps && _during_marking) { |
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|
1534 _bitmap.retire(); |
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|
1535 } |
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|
1536 ParGCAllocBuffer::retire(end_of_gc, retain); |
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|
1537 _retired = true; |
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|
1538 } |
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|
1539 }; |
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|
1540 |
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|
1541 class G1ParScanThreadState : public StackObj { |
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|
1542 protected: |
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|
1543 G1CollectedHeap* _g1h; |
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|
1544 RefToScanQueue* _refs; |
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|
1545 DirtyCardQueue _dcq; |
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|
1546 CardTableModRefBS* _ct_bs; |
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|
1547 G1RemSet* _g1_rem; |
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|
1548 |
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|
1549 typedef GrowableArray<StarTask> OverflowQueue; |
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|
1550 OverflowQueue* _overflowed_refs; |
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|
1551 |
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|
1552 G1ParGCAllocBuffer _alloc_buffers[GCAllocPurposeCount]; |
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|
1553 ageTable _age_table; |
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|
1554 |
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|
1555 size_t _alloc_buffer_waste; |
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|
1556 size_t _undo_waste; |
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|
1557 |
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|
1558 OopsInHeapRegionClosure* _evac_failure_cl; |
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|
1559 G1ParScanHeapEvacClosure* _evac_cl; |
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|
1560 G1ParScanPartialArrayClosure* _partial_scan_cl; |
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|
1561 |
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|
1562 int _hash_seed; |
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|
1563 int _queue_num; |
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|
1564 |
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|
1565 int _term_attempts; |
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|
1566 #if G1_DETAILED_STATS |
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|
1567 int _pushes, _pops, _steals, _steal_attempts; |
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|
1568 int _overflow_pushes; |
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|
1569 #endif |
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|
1570 |
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|
1571 double _start; |
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|
1572 double _start_strong_roots; |
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|
1573 double _strong_roots_time; |
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1574 double _start_term; |
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1575 double _term_time; |
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1576 |
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1577 // Map from young-age-index (0 == not young, 1 is youngest) to |
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1578 // surviving words. base is what we get back from the malloc call |
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1579 size_t* _surviving_young_words_base; |
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1580 // this points into the array, as we use the first few entries for padding |
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1581 size_t* _surviving_young_words; |
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1582 |
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1583 #define PADDING_ELEM_NUM (64 / sizeof(size_t)) |
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1584 |
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1585 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } |
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1586 |
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1587 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } |
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1588 |
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1589 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
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1590 CardTableModRefBS* ctbs() { return _ct_bs; } |
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1591 |
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1592 template <class T> void immediate_rs_update(HeapRegion* from, T* p, int tid) { |
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1593 if (!from->is_survivor()) { |
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1594 _g1_rem->par_write_ref(from, p, tid); |
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1595 } |
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1596 } |
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1597 |
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1598 template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) { |
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1599 // If the new value of the field points to the same region or |
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1600 // is the to-space, we don't need to include it in the Rset updates. |
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1601 if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) { |
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1602 size_t card_index = ctbs()->index_for(p); |
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1603 // If the card hasn't been added to the buffer, do it. |
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1604 if (ctbs()->mark_card_deferred(card_index)) { |
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1605 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
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1606 } |
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1607 } |
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1608 } |
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|
1609 |
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1610 public: |
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1611 G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num); |
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1612 |
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1613 ~G1ParScanThreadState() { |
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1614 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base); |
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1615 } |
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1616 |
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1617 RefToScanQueue* refs() { return _refs; } |
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1618 OverflowQueue* overflowed_refs() { return _overflowed_refs; } |
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1619 ageTable* age_table() { return &_age_table; } |
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1620 |
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1621 G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) { |
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1622 return &_alloc_buffers[purpose]; |
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1623 } |
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1624 |
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1625 size_t alloc_buffer_waste() { return _alloc_buffer_waste; } |
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1626 size_t undo_waste() { return _undo_waste; } |
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1627 |
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1628 template <class T> void push_on_queue(T* ref) { |
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1629 assert(ref != NULL, "invariant"); |
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1630 assert(has_partial_array_mask(ref) || |
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1631 _g1h->is_in_g1_reserved(oopDesc::load_decode_heap_oop(ref)), "invariant"); |
845
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|
1632 #ifdef ASSERT |
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1633 if (has_partial_array_mask(ref)) { |
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1634 oop p = clear_partial_array_mask(ref); |
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|
1635 // Verify that we point into the CS |
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|
1636 assert(_g1h->obj_in_cs(p), "Should be in CS"); |
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|
1637 } |
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|
1638 #endif |
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|
1639 if (!refs()->push(ref)) { |
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|
1640 overflowed_refs()->push(ref); |
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|
1641 IF_G1_DETAILED_STATS(note_overflow_push()); |
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|
1642 } else { |
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|
1643 IF_G1_DETAILED_STATS(note_push()); |
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|
1644 } |
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|
1645 } |
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|
1646 |
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|
1647 void pop_from_queue(StarTask& ref) { |
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|
1648 if (refs()->pop_local(ref)) { |
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|
1649 assert((oop*)ref != NULL, "pop_local() returned true"); |
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|
1650 assert(UseCompressedOops || !ref.is_narrow(), "Error"); |
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|
1651 assert(has_partial_array_mask((oop*)ref) || |
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|
1652 _g1h->is_in_g1_reserved(ref.is_narrow() ? oopDesc::load_decode_heap_oop((narrowOop*)ref) |
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|
1653 : oopDesc::load_decode_heap_oop((oop*)ref)), |
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|
1654 "invariant"); |
845
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|
1655 IF_G1_DETAILED_STATS(note_pop()); |
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|
1656 } else { |
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|
1657 StarTask null_task; |
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|
1658 ref = null_task; |
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|
1659 } |
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|
1660 } |
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|
1661 |
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|
1662 void pop_from_overflow_queue(StarTask& ref) { |
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|
1663 StarTask new_ref = overflowed_refs()->pop(); |
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|
1664 assert((oop*)new_ref != NULL, "pop() from a local non-empty stack"); |
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|
1665 assert(UseCompressedOops || !new_ref.is_narrow(), "Error"); |
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|
1666 assert(has_partial_array_mask((oop*)new_ref) || |
1261
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|
1667 _g1h->is_in_g1_reserved(new_ref.is_narrow() ? oopDesc::load_decode_heap_oop((narrowOop*)new_ref) |
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|
1668 : oopDesc::load_decode_heap_oop((oop*)new_ref)), |
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|
1669 "invariant"); |
845
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|
1670 ref = new_ref; |
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|
1671 } |
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|
1672 |
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|
1673 int refs_to_scan() { return refs()->size(); } |
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|
1674 int overflowed_refs_to_scan() { return overflowed_refs()->length(); } |
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|
1675 |
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|
1676 template <class T> void update_rs(HeapRegion* from, T* p, int tid) { |
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|
1677 if (G1DeferredRSUpdate) { |
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|
1678 deferred_rs_update(from, p, tid); |
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|
1679 } else { |
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|
1680 immediate_rs_update(from, p, tid); |
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|
1681 } |
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|
1682 } |
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|
1683 |
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|
1684 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
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|
1685 |
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|
1686 HeapWord* obj = NULL; |
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|
1687 if (word_sz * 100 < |
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|
1688 (size_t)(G1ParallelGCAllocBufferSize / HeapWordSize) * |
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|
1689 ParallelGCBufferWastePct) { |
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|
1690 G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose); |
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|
1691 add_to_alloc_buffer_waste(alloc_buf->words_remaining()); |
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|
1692 alloc_buf->retire(false, false); |
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|
1693 |
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|
1694 HeapWord* buf = |
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|
1695 _g1h->par_allocate_during_gc(purpose, G1ParallelGCAllocBufferSize / HeapWordSize); |
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|
1696 if (buf == NULL) return NULL; // Let caller handle allocation failure. |
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|
1697 // Otherwise. |
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1698 alloc_buf->set_buf(buf); |
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|
1699 |
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1700 obj = alloc_buf->allocate(word_sz); |
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1701 assert(obj != NULL, "buffer was definitely big enough..."); |
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1702 } else { |
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|
1703 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
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|
1704 } |
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|
1705 return obj; |
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|
1706 } |
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|
1707 |
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1708 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { |
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6700789: G1: Enable use of compressed oops with G1 heaps
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1709 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); |
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1710 if (obj != NULL) return obj; |
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1711 return allocate_slow(purpose, word_sz); |
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1712 } |
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|
1713 |
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1714 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { |
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6700789: G1: Enable use of compressed oops with G1 heaps
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1715 if (alloc_buffer(purpose)->contains(obj)) { |
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1716 assert(alloc_buffer(purpose)->contains(obj + word_sz - 1), |
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1717 "should contain whole object"); |
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1718 alloc_buffer(purpose)->undo_allocation(obj, word_sz); |
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1719 } else { |
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1720 CollectedHeap::fill_with_object(obj, word_sz); |
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1721 add_to_undo_waste(word_sz); |
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1722 } |
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|
1723 } |
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|
1724 |
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1725 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { |
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1726 _evac_failure_cl = evac_failure_cl; |
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1727 } |
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1728 OopsInHeapRegionClosure* evac_failure_closure() { |
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1729 return _evac_failure_cl; |
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|
1730 } |
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|
1731 |
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1732 void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) { |
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1733 _evac_cl = evac_cl; |
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1734 } |
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1735 |
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1736 void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) { |
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1737 _partial_scan_cl = partial_scan_cl; |
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1738 } |
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1739 |
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|
1740 int* hash_seed() { return &_hash_seed; } |
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1741 int queue_num() { return _queue_num; } |
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|
1742 |
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1743 int term_attempts() { return _term_attempts; } |
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1744 void note_term_attempt() { _term_attempts++; } |
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|
1745 |
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1746 #if G1_DETAILED_STATS |
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1747 int pushes() { return _pushes; } |
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1748 int pops() { return _pops; } |
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1749 int steals() { return _steals; } |
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1750 int steal_attempts() { return _steal_attempts; } |
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|
1751 int overflow_pushes() { return _overflow_pushes; } |
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|
1752 |
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1753 void note_push() { _pushes++; } |
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|
1754 void note_pop() { _pops++; } |
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1755 void note_steal() { _steals++; } |
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|
1756 void note_steal_attempt() { _steal_attempts++; } |
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|
1757 void note_overflow_push() { _overflow_pushes++; } |
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|
1758 #endif |
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|
1759 |
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|
1760 void start_strong_roots() { |
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|
1761 _start_strong_roots = os::elapsedTime(); |
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|
1762 } |
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|
1763 void end_strong_roots() { |
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1764 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); |
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1765 } |
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|
1766 double strong_roots_time() { return _strong_roots_time; } |
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|
1767 |
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|
1768 void start_term_time() { |
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|
1769 note_term_attempt(); |
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|
1770 _start_term = os::elapsedTime(); |
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|
1771 } |
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|
1772 void end_term_time() { |
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1773 _term_time += (os::elapsedTime() - _start_term); |
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|
1774 } |
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|
1775 double term_time() { return _term_time; } |
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|
1776 |
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|
1777 double elapsed() { |
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|
1778 return os::elapsedTime() - _start; |
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|
1779 } |
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|
1780 |
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|
1781 size_t* surviving_young_words() { |
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|
1782 // We add on to hide entry 0 which accumulates surviving words for |
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1783 // age -1 regions (i.e. non-young ones) |
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|
1784 return _surviving_young_words; |
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|
1785 } |
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|
1786 |
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|
1787 void retire_alloc_buffers() { |
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|
1788 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
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1789 size_t waste = _alloc_buffers[ap].words_remaining(); |
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1790 add_to_alloc_buffer_waste(waste); |
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|
1791 _alloc_buffers[ap].retire(true, false); |
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1792 } |
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1793 } |
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|
1794 |
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1795 private: |
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1796 template <class T> void deal_with_reference(T* ref_to_scan) { |
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1797 if (has_partial_array_mask(ref_to_scan)) { |
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1798 _partial_scan_cl->do_oop_nv(ref_to_scan); |
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1799 } else { |
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1800 // Note: we can use "raw" versions of "region_containing" because |
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1801 // "obj_to_scan" is definitely in the heap, and is not in a |
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1802 // humongous region. |
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1803 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); |
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1804 _evac_cl->set_region(r); |
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1805 _evac_cl->do_oop_nv(ref_to_scan); |
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1806 } |
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1807 } |
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1808 |
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1809 public: |
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1810 void trim_queue() { |
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1811 // I've replicated the loop twice, first to drain the overflow |
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1812 // queue, second to drain the task queue. This is better than |
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1813 // having a single loop, which checks both conditions and, inside |
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1814 // it, either pops the overflow queue or the task queue, as each |
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1815 // loop is tighter. Also, the decision to drain the overflow queue |
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1816 // first is not arbitrary, as the overflow queue is not visible |
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1817 // to the other workers, whereas the task queue is. So, we want to |
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1818 // drain the "invisible" entries first, while allowing the other |
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1819 // workers to potentially steal the "visible" entries. |
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1820 |
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1821 while (refs_to_scan() > 0 || overflowed_refs_to_scan() > 0) { |
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1822 while (overflowed_refs_to_scan() > 0) { |
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1823 StarTask ref_to_scan; |
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1824 assert((oop*)ref_to_scan == NULL, "Constructed above"); |
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1825 pop_from_overflow_queue(ref_to_scan); |
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1826 // We shouldn't have pushed it on the queue if it was not |
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1827 // pointing into the CSet. |
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1828 assert((oop*)ref_to_scan != NULL, "Follows from inner loop invariant"); |
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1829 if (ref_to_scan.is_narrow()) { |
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1830 assert(UseCompressedOops, "Error"); |
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1831 narrowOop* p = (narrowOop*)ref_to_scan; |
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1832 assert(!has_partial_array_mask(p) && |
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1833 _g1h->is_in_g1_reserved(oopDesc::load_decode_heap_oop(p)), "sanity"); |
845
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1834 deal_with_reference(p); |
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1835 } else { |
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1836 oop* p = (oop*)ref_to_scan; |
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1837 assert((has_partial_array_mask(p) && _g1h->is_in_g1_reserved(clear_partial_array_mask(p))) || |
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1838 _g1h->is_in_g1_reserved(oopDesc::load_decode_heap_oop(p)), "sanity"); |
845
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1839 deal_with_reference(p); |
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1840 } |
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1841 } |
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1842 |
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1843 while (refs_to_scan() > 0) { |
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1844 StarTask ref_to_scan; |
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1845 assert((oop*)ref_to_scan == NULL, "Constructed above"); |
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1846 pop_from_queue(ref_to_scan); |
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1847 if ((oop*)ref_to_scan != NULL) { |
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1848 if (ref_to_scan.is_narrow()) { |
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1849 assert(UseCompressedOops, "Error"); |
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1850 narrowOop* p = (narrowOop*)ref_to_scan; |
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1851 assert(!has_partial_array_mask(p) && |
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1852 _g1h->is_in_g1_reserved(oopDesc::load_decode_heap_oop(p)), "sanity"); |
845
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1853 deal_with_reference(p); |
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1854 } else { |
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1855 oop* p = (oop*)ref_to_scan; |
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1856 assert((has_partial_array_mask(p) && _g1h->obj_in_cs(clear_partial_array_mask(p))) || |
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1857 _g1h->is_in_g1_reserved(oopDesc::load_decode_heap_oop(p)), "sanity"); |
845
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1858 deal_with_reference(p); |
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1859 } |
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1860 } |
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1861 } |
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1862 } |
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1863 } |
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1864 }; |