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annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 2362:a2c2eac1ca62
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Reviewed-by: phh, kvn
author | jcoomes |
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date | Sun, 06 Mar 2011 11:37:18 -0800 |
parents | 1216415d8e35 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "code/icBuffer.hpp" | |
27 #include "gc_implementation/g1/bufferingOopClosure.hpp" | |
28 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
29 #include "gc_implementation/g1/concurrentG1RefineThread.hpp" | |
30 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
31 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
32 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
33 #include "gc_implementation/g1/g1MarkSweep.hpp" | |
34 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
35 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
36 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
37 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
38 #include "gc_implementation/g1/vm_operations_g1.hpp" | |
39 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
40 #include "memory/gcLocker.inline.hpp" | |
41 #include "memory/genOopClosures.inline.hpp" | |
42 #include "memory/generationSpec.hpp" | |
43 #include "oops/oop.inline.hpp" | |
44 #include "oops/oop.pcgc.inline.hpp" | |
45 #include "runtime/aprofiler.hpp" | |
46 #include "runtime/vmThread.hpp" | |
342 | 47 |
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48 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0; |
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49 |
342 | 50 // turn it on so that the contents of the young list (scan-only / |
51 // to-be-collected) are printed at "strategic" points before / during | |
52 // / after the collection --- this is useful for debugging | |
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53 #define YOUNG_LIST_VERBOSE 0 |
342 | 54 // CURRENT STATUS |
55 // This file is under construction. Search for "FIXME". | |
56 | |
57 // INVARIANTS/NOTES | |
58 // | |
59 // All allocation activity covered by the G1CollectedHeap interface is | |
1973 | 60 // serialized by acquiring the HeapLock. This happens in mem_allocate |
61 // and allocate_new_tlab, which are the "entry" points to the | |
62 // allocation code from the rest of the JVM. (Note that this does not | |
63 // apply to TLAB allocation, which is not part of this interface: it | |
64 // is done by clients of this interface.) | |
342 | 65 |
66 // Local to this file. | |
67 | |
68 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
69 SuspendibleThreadSet* _sts; | |
70 G1RemSet* _g1rs; | |
71 ConcurrentG1Refine* _cg1r; | |
72 bool _concurrent; | |
73 public: | |
74 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
75 G1RemSet* g1rs, | |
76 ConcurrentG1Refine* cg1r) : | |
77 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
78 {} | |
79 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
1705 | 80 bool oops_into_cset = _g1rs->concurrentRefineOneCard(card_ptr, worker_i, false); |
81 // This path is executed by the concurrent refine or mutator threads, | |
82 // concurrently, and so we do not care if card_ptr contains references | |
83 // that point into the collection set. | |
84 assert(!oops_into_cset, "should be"); | |
85 | |
342 | 86 if (_concurrent && _sts->should_yield()) { |
87 // Caller will actually yield. | |
88 return false; | |
89 } | |
90 // Otherwise, we finished successfully; return true. | |
91 return true; | |
92 } | |
93 void set_concurrent(bool b) { _concurrent = b; } | |
94 }; | |
95 | |
96 | |
97 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
98 int _calls; | |
99 G1CollectedHeap* _g1h; | |
100 CardTableModRefBS* _ctbs; | |
101 int _histo[256]; | |
102 public: | |
103 ClearLoggedCardTableEntryClosure() : | |
104 _calls(0) | |
105 { | |
106 _g1h = G1CollectedHeap::heap(); | |
107 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
108 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
109 } | |
110 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
111 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
112 _calls++; | |
113 unsigned char* ujb = (unsigned char*)card_ptr; | |
114 int ind = (int)(*ujb); | |
115 _histo[ind]++; | |
116 *card_ptr = -1; | |
117 } | |
118 return true; | |
119 } | |
120 int calls() { return _calls; } | |
121 void print_histo() { | |
122 gclog_or_tty->print_cr("Card table value histogram:"); | |
123 for (int i = 0; i < 256; i++) { | |
124 if (_histo[i] != 0) { | |
125 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
126 } | |
127 } | |
128 } | |
129 }; | |
130 | |
131 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
132 int _calls; | |
133 G1CollectedHeap* _g1h; | |
134 CardTableModRefBS* _ctbs; | |
135 public: | |
136 RedirtyLoggedCardTableEntryClosure() : | |
137 _calls(0) | |
138 { | |
139 _g1h = G1CollectedHeap::heap(); | |
140 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
141 } | |
142 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
143 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
144 _calls++; | |
145 *card_ptr = 0; | |
146 } | |
147 return true; | |
148 } | |
149 int calls() { return _calls; } | |
150 }; | |
151 | |
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152 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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153 public: |
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154 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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155 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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156 return true; |
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157 } |
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158 }; |
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159 |
342 | 160 YoungList::YoungList(G1CollectedHeap* g1h) |
161 : _g1h(g1h), _head(NULL), | |
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162 _length(0), |
342 | 163 _last_sampled_rs_lengths(0), |
545 | 164 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) |
342 | 165 { |
166 guarantee( check_list_empty(false), "just making sure..." ); | |
167 } | |
168 | |
169 void YoungList::push_region(HeapRegion *hr) { | |
170 assert(!hr->is_young(), "should not already be young"); | |
171 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
172 | |
173 hr->set_next_young_region(_head); | |
174 _head = hr; | |
175 | |
176 hr->set_young(); | |
177 double yg_surv_rate = _g1h->g1_policy()->predict_yg_surv_rate((int)_length); | |
178 ++_length; | |
179 } | |
180 | |
181 void YoungList::add_survivor_region(HeapRegion* hr) { | |
545 | 182 assert(hr->is_survivor(), "should be flagged as survivor region"); |
342 | 183 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
184 | |
185 hr->set_next_young_region(_survivor_head); | |
186 if (_survivor_head == NULL) { | |
545 | 187 _survivor_tail = hr; |
342 | 188 } |
189 _survivor_head = hr; | |
190 | |
191 ++_survivor_length; | |
192 } | |
193 | |
194 void YoungList::empty_list(HeapRegion* list) { | |
195 while (list != NULL) { | |
196 HeapRegion* next = list->get_next_young_region(); | |
197 list->set_next_young_region(NULL); | |
198 list->uninstall_surv_rate_group(); | |
199 list->set_not_young(); | |
200 list = next; | |
201 } | |
202 } | |
203 | |
204 void YoungList::empty_list() { | |
205 assert(check_list_well_formed(), "young list should be well formed"); | |
206 | |
207 empty_list(_head); | |
208 _head = NULL; | |
209 _length = 0; | |
210 | |
211 empty_list(_survivor_head); | |
212 _survivor_head = NULL; | |
545 | 213 _survivor_tail = NULL; |
342 | 214 _survivor_length = 0; |
215 | |
216 _last_sampled_rs_lengths = 0; | |
217 | |
218 assert(check_list_empty(false), "just making sure..."); | |
219 } | |
220 | |
221 bool YoungList::check_list_well_formed() { | |
222 bool ret = true; | |
223 | |
224 size_t length = 0; | |
225 HeapRegion* curr = _head; | |
226 HeapRegion* last = NULL; | |
227 while (curr != NULL) { | |
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228 if (!curr->is_young()) { |
342 | 229 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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230 "incorrectly tagged (y: %d, surv: %d)", |
342 | 231 curr->bottom(), curr->end(), |
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232 curr->is_young(), curr->is_survivor()); |
342 | 233 ret = false; |
234 } | |
235 ++length; | |
236 last = curr; | |
237 curr = curr->get_next_young_region(); | |
238 } | |
239 ret = ret && (length == _length); | |
240 | |
241 if (!ret) { | |
242 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
243 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
244 length, _length); | |
245 } | |
246 | |
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247 return ret; |
342 | 248 } |
249 | |
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250 bool YoungList::check_list_empty(bool check_sample) { |
342 | 251 bool ret = true; |
252 | |
253 if (_length != 0) { | |
254 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
255 _length); | |
256 ret = false; | |
257 } | |
258 if (check_sample && _last_sampled_rs_lengths != 0) { | |
259 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
260 ret = false; | |
261 } | |
262 if (_head != NULL) { | |
263 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
264 ret = false; | |
265 } | |
266 if (!ret) { | |
267 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
268 } | |
269 | |
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270 return ret; |
342 | 271 } |
272 | |
273 void | |
274 YoungList::rs_length_sampling_init() { | |
275 _sampled_rs_lengths = 0; | |
276 _curr = _head; | |
277 } | |
278 | |
279 bool | |
280 YoungList::rs_length_sampling_more() { | |
281 return _curr != NULL; | |
282 } | |
283 | |
284 void | |
285 YoungList::rs_length_sampling_next() { | |
286 assert( _curr != NULL, "invariant" ); | |
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287 size_t rs_length = _curr->rem_set()->occupied(); |
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288 |
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289 _sampled_rs_lengths += rs_length; |
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290 |
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291 // The current region may not yet have been added to the |
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292 // incremental collection set (it gets added when it is |
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293 // retired as the current allocation region). |
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294 if (_curr->in_collection_set()) { |
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295 // Update the collection set policy information for this region |
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296 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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297 } |
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298 |
342 | 299 _curr = _curr->get_next_young_region(); |
300 if (_curr == NULL) { | |
301 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
302 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
303 } | |
304 } | |
305 | |
306 void | |
307 YoungList::reset_auxilary_lists() { | |
308 guarantee( is_empty(), "young list should be empty" ); | |
309 assert(check_list_well_formed(), "young list should be well formed"); | |
310 | |
311 // Add survivor regions to SurvRateGroup. | |
312 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
545 | 313 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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314 |
342 | 315 for (HeapRegion* curr = _survivor_head; |
316 curr != NULL; | |
317 curr = curr->get_next_young_region()) { | |
318 _g1h->g1_policy()->set_region_survivors(curr); | |
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319 |
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320 // The region is a non-empty survivor so let's add it to |
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321 // the incremental collection set for the next evacuation |
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322 // pause. |
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323 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
342 | 324 } |
325 _g1h->g1_policy()->note_stop_adding_survivor_regions(); | |
326 | |
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327 _head = _survivor_head; |
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328 _length = _survivor_length; |
342 | 329 if (_survivor_head != NULL) { |
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330 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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331 assert(_survivor_length > 0, "invariant"); |
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332 _survivor_tail->set_next_young_region(NULL); |
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333 } |
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334 |
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335 // Don't clear the survivor list handles until the start of |
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336 // the next evacuation pause - we need it in order to re-tag |
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337 // the survivor regions from this evacuation pause as 'young' |
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338 // at the start of the next. |
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339 |
545 | 340 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
342 | 341 |
342 assert(check_list_well_formed(), "young list should be well formed"); | |
343 } | |
344 | |
345 void YoungList::print() { | |
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346 HeapRegion* lists[] = {_head, _survivor_head}; |
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347 const char* names[] = {"YOUNG", "SURVIVOR"}; |
342 | 348 |
349 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
350 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
351 HeapRegion *curr = lists[list]; | |
352 if (curr == NULL) | |
353 gclog_or_tty->print_cr(" empty"); | |
354 while (curr != NULL) { | |
355 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
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356 "age: %4d, y: %d, surv: %d", |
342 | 357 curr->bottom(), curr->end(), |
358 curr->top(), | |
359 curr->prev_top_at_mark_start(), | |
360 curr->next_top_at_mark_start(), | |
361 curr->top_at_conc_mark_count(), | |
362 curr->age_in_surv_rate_group_cond(), | |
363 curr->is_young(), | |
364 curr->is_survivor()); | |
365 curr = curr->get_next_young_region(); | |
366 } | |
367 } | |
368 | |
369 gclog_or_tty->print_cr(""); | |
370 } | |
371 | |
796
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372 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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373 { |
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374 // Claim the right to put the region on the dirty cards region list |
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375 // by installing a self pointer. |
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376 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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377 if (next == NULL) { |
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378 HeapRegion* res = (HeapRegion*) |
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379 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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380 NULL); |
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381 if (res == NULL) { |
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382 HeapRegion* head; |
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383 do { |
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384 // Put the region to the dirty cards region list. |
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385 head = _dirty_cards_region_list; |
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386 next = (HeapRegion*) |
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387 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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388 if (next == head) { |
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389 assert(hr->get_next_dirty_cards_region() == hr, |
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390 "hr->get_next_dirty_cards_region() != hr"); |
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391 if (next == NULL) { |
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392 // The last region in the list points to itself. |
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393 hr->set_next_dirty_cards_region(hr); |
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394 } else { |
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395 hr->set_next_dirty_cards_region(next); |
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396 } |
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397 } |
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398 } while (next != head); |
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399 } |
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400 } |
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401 } |
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402 |
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403 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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404 { |
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405 HeapRegion* head; |
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406 HeapRegion* hr; |
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407 do { |
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408 head = _dirty_cards_region_list; |
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409 if (head == NULL) { |
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410 return NULL; |
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411 } |
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412 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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413 if (head == new_head) { |
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414 // The last region. |
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415 new_head = NULL; |
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416 } |
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417 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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418 head); |
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419 } while (hr != head); |
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420 assert(hr != NULL, "invariant"); |
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421 hr->set_next_dirty_cards_region(NULL); |
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422 return hr; |
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423 } |
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424 |
342 | 425 void G1CollectedHeap::stop_conc_gc_threads() { |
794 | 426 _cg1r->stop(); |
342 | 427 _cmThread->stop(); |
428 } | |
429 | |
430 void G1CollectedHeap::check_ct_logs_at_safepoint() { | |
431 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
432 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
433 | |
434 // Count the dirty cards at the start. | |
435 CountNonCleanMemRegionClosure count1(this); | |
436 ct_bs->mod_card_iterate(&count1); | |
437 int orig_count = count1.n(); | |
438 | |
439 // First clear the logged cards. | |
440 ClearLoggedCardTableEntryClosure clear; | |
441 dcqs.set_closure(&clear); | |
442 dcqs.apply_closure_to_all_completed_buffers(); | |
443 dcqs.iterate_closure_all_threads(false); | |
444 clear.print_histo(); | |
445 | |
446 // Now ensure that there's no dirty cards. | |
447 CountNonCleanMemRegionClosure count2(this); | |
448 ct_bs->mod_card_iterate(&count2); | |
449 if (count2.n() != 0) { | |
450 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
451 count2.n(), orig_count); | |
452 } | |
453 guarantee(count2.n() == 0, "Card table should be clean."); | |
454 | |
455 RedirtyLoggedCardTableEntryClosure redirty; | |
456 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
457 dcqs.apply_closure_to_all_completed_buffers(); | |
458 dcqs.iterate_closure_all_threads(false); | |
459 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
460 clear.calls(), orig_count); | |
461 guarantee(redirty.calls() == clear.calls(), | |
462 "Or else mechanism is broken."); | |
463 | |
464 CountNonCleanMemRegionClosure count3(this); | |
465 ct_bs->mod_card_iterate(&count3); | |
466 if (count3.n() != orig_count) { | |
467 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
468 orig_count, count3.n()); | |
469 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
470 } | |
471 | |
472 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
473 } | |
474 | |
475 // Private class members. | |
476 | |
477 G1CollectedHeap* G1CollectedHeap::_g1h; | |
478 | |
479 // Private methods. | |
480 | |
2152 | 481 HeapRegion* |
2361 | 482 G1CollectedHeap::new_region_try_secondary_free_list() { |
2152 | 483 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
484 while (!_secondary_free_list.is_empty() || free_regions_coming()) { | |
485 if (!_secondary_free_list.is_empty()) { | |
486 if (G1ConcRegionFreeingVerbose) { | |
487 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
488 "secondary_free_list has "SIZE_FORMAT" entries", | |
489 _secondary_free_list.length()); | |
490 } | |
491 // It looks as if there are free regions available on the | |
492 // secondary_free_list. Let's move them to the free_list and try | |
493 // again to allocate from it. | |
494 append_secondary_free_list(); | |
495 | |
496 assert(!_free_list.is_empty(), "if the secondary_free_list was not " | |
497 "empty we should have moved at least one entry to the free_list"); | |
498 HeapRegion* res = _free_list.remove_head(); | |
499 if (G1ConcRegionFreeingVerbose) { | |
500 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
501 "allocated "HR_FORMAT" from secondary_free_list", | |
502 HR_FORMAT_PARAMS(res)); | |
503 } | |
504 return res; | |
505 } | |
506 | |
507 // Wait here until we get notifed either when (a) there are no | |
508 // more free regions coming or (b) some regions have been moved on | |
509 // the secondary_free_list. | |
510 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
511 } | |
512 | |
513 if (G1ConcRegionFreeingVerbose) { | |
514 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
515 "could not allocate from secondary_free_list"); | |
516 } | |
517 return NULL; | |
518 } | |
519 | |
520 HeapRegion* G1CollectedHeap::new_region_work(size_t word_size, | |
521 bool do_expand) { | |
522 assert(!isHumongous(word_size) || | |
523 word_size <= (size_t) HeapRegion::GrainWords, | |
524 "the only time we use this to allocate a humongous region is " | |
525 "when we are allocating a single humongous region"); | |
526 | |
527 HeapRegion* res; | |
528 if (G1StressConcRegionFreeing) { | |
529 if (!_secondary_free_list.is_empty()) { | |
530 if (G1ConcRegionFreeingVerbose) { | |
531 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
532 "forced to look at the secondary_free_list"); | |
533 } | |
2361 | 534 res = new_region_try_secondary_free_list(); |
2152 | 535 if (res != NULL) { |
536 return res; | |
537 } | |
538 } | |
539 } | |
540 res = _free_list.remove_head_or_null(); | |
541 if (res == NULL) { | |
542 if (G1ConcRegionFreeingVerbose) { | |
543 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
544 "res == NULL, trying the secondary_free_list"); | |
545 } | |
2361 | 546 res = new_region_try_secondary_free_list(); |
2152 | 547 } |
342 | 548 if (res == NULL && do_expand) { |
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549 if (expand(word_size * HeapWordSize)) { |
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550 // The expansion succeeded and so we should have at least one |
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551 // region on the free list. |
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552 res = _free_list.remove_head(); |
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553 } |
342 | 554 } |
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555 if (res != NULL) { |
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556 if (G1PrintHeapRegions) { |
2152 | 557 gclog_or_tty->print_cr("new alloc region %d:["PTR_FORMAT","PTR_FORMAT"], " |
558 "top "PTR_FORMAT, res->hrs_index(), | |
559 res->bottom(), res->end(), res->top()); | |
342 | 560 } |
561 } | |
562 return res; | |
563 } | |
564 | |
2152 | 565 HeapRegion* G1CollectedHeap::new_gc_alloc_region(int purpose, |
566 size_t word_size) { | |
342 | 567 HeapRegion* alloc_region = NULL; |
568 if (_gc_alloc_region_counts[purpose] < g1_policy()->max_regions(purpose)) { | |
2152 | 569 alloc_region = new_region_work(word_size, true /* do_expand */); |
342 | 570 if (purpose == GCAllocForSurvived && alloc_region != NULL) { |
545 | 571 alloc_region->set_survivor(); |
342 | 572 } |
573 ++_gc_alloc_region_counts[purpose]; | |
574 } else { | |
575 g1_policy()->note_alloc_region_limit_reached(purpose); | |
576 } | |
577 return alloc_region; | |
578 } | |
579 | |
2152 | 580 int G1CollectedHeap::humongous_obj_allocate_find_first(size_t num_regions, |
581 size_t word_size) { | |
2361 | 582 assert(isHumongous(word_size), "word_size should be humongous"); |
583 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
584 | |
2152 | 585 int first = -1; |
586 if (num_regions == 1) { | |
587 // Only one region to allocate, no need to go through the slower | |
588 // path. The caller will attempt the expasion if this fails, so | |
589 // let's not try to expand here too. | |
590 HeapRegion* hr = new_region_work(word_size, false /* do_expand */); | |
591 if (hr != NULL) { | |
592 first = hr->hrs_index(); | |
593 } else { | |
594 first = -1; | |
595 } | |
596 } else { | |
597 // We can't allocate humongous regions while cleanupComplete() is | |
598 // running, since some of the regions we find to be empty might not | |
599 // yet be added to the free list and it is not straightforward to | |
600 // know which list they are on so that we can remove them. Note | |
601 // that we only need to do this if we need to allocate more than | |
602 // one region to satisfy the current humongous allocation | |
603 // request. If we are only allocating one region we use the common | |
604 // region allocation code (see above). | |
605 wait_while_free_regions_coming(); | |
2361 | 606 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 607 |
608 if (free_regions() >= num_regions) { | |
609 first = _hrs->find_contiguous(num_regions); | |
610 if (first != -1) { | |
611 for (int i = first; i < first + (int) num_regions; ++i) { | |
612 HeapRegion* hr = _hrs->at(i); | |
613 assert(hr->is_empty(), "sanity"); | |
2361 | 614 assert(is_on_master_free_list(hr), "sanity"); |
2152 | 615 hr->set_pending_removal(true); |
616 } | |
617 _free_list.remove_all_pending(num_regions); | |
618 } | |
619 } | |
620 } | |
621 return first; | |
622 } | |
623 | |
2361 | 624 HeapWord* |
625 G1CollectedHeap::humongous_obj_allocate_initialize_regions(int first, | |
626 size_t num_regions, | |
627 size_t word_size) { | |
628 assert(first != -1, "pre-condition"); | |
629 assert(isHumongous(word_size), "word_size should be humongous"); | |
630 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
631 | |
632 // Index of last region in the series + 1. | |
633 int last = first + (int) num_regions; | |
634 | |
635 // We need to initialize the region(s) we just discovered. This is | |
636 // a bit tricky given that it can happen concurrently with | |
637 // refinement threads refining cards on these regions and | |
638 // potentially wanting to refine the BOT as they are scanning | |
639 // those cards (this can happen shortly after a cleanup; see CR | |
640 // 6991377). So we have to set up the region(s) carefully and in | |
641 // a specific order. | |
642 | |
643 // The word size sum of all the regions we will allocate. | |
644 size_t word_size_sum = num_regions * HeapRegion::GrainWords; | |
645 assert(word_size <= word_size_sum, "sanity"); | |
646 | |
647 // This will be the "starts humongous" region. | |
648 HeapRegion* first_hr = _hrs->at(first); | |
649 // The header of the new object will be placed at the bottom of | |
650 // the first region. | |
651 HeapWord* new_obj = first_hr->bottom(); | |
652 // This will be the new end of the first region in the series that | |
653 // should also match the end of the last region in the seriers. | |
654 HeapWord* new_end = new_obj + word_size_sum; | |
655 // This will be the new top of the first region that will reflect | |
656 // this allocation. | |
657 HeapWord* new_top = new_obj + word_size; | |
658 | |
659 // First, we need to zero the header of the space that we will be | |
660 // allocating. When we update top further down, some refinement | |
661 // threads might try to scan the region. By zeroing the header we | |
662 // ensure that any thread that will try to scan the region will | |
663 // come across the zero klass word and bail out. | |
664 // | |
665 // NOTE: It would not have been correct to have used | |
666 // CollectedHeap::fill_with_object() and make the space look like | |
667 // an int array. The thread that is doing the allocation will | |
668 // later update the object header to a potentially different array | |
669 // type and, for a very short period of time, the klass and length | |
670 // fields will be inconsistent. This could cause a refinement | |
671 // thread to calculate the object size incorrectly. | |
672 Copy::fill_to_words(new_obj, oopDesc::header_size(), 0); | |
673 | |
674 // We will set up the first region as "starts humongous". This | |
675 // will also update the BOT covering all the regions to reflect | |
676 // that there is a single object that starts at the bottom of the | |
677 // first region. | |
678 first_hr->set_startsHumongous(new_top, new_end); | |
679 | |
680 // Then, if there are any, we will set up the "continues | |
681 // humongous" regions. | |
682 HeapRegion* hr = NULL; | |
683 for (int i = first + 1; i < last; ++i) { | |
684 hr = _hrs->at(i); | |
685 hr->set_continuesHumongous(first_hr); | |
686 } | |
687 // If we have "continues humongous" regions (hr != NULL), then the | |
688 // end of the last one should match new_end. | |
689 assert(hr == NULL || hr->end() == new_end, "sanity"); | |
690 | |
691 // Up to this point no concurrent thread would have been able to | |
692 // do any scanning on any region in this series. All the top | |
693 // fields still point to bottom, so the intersection between | |
694 // [bottom,top] and [card_start,card_end] will be empty. Before we | |
695 // update the top fields, we'll do a storestore to make sure that | |
696 // no thread sees the update to top before the zeroing of the | |
697 // object header and the BOT initialization. | |
698 OrderAccess::storestore(); | |
699 | |
700 // Now that the BOT and the object header have been initialized, | |
701 // we can update top of the "starts humongous" region. | |
702 assert(first_hr->bottom() < new_top && new_top <= first_hr->end(), | |
703 "new_top should be in this region"); | |
704 first_hr->set_top(new_top); | |
705 | |
706 // Now, we will update the top fields of the "continues humongous" | |
707 // regions. The reason we need to do this is that, otherwise, | |
708 // these regions would look empty and this will confuse parts of | |
709 // G1. For example, the code that looks for a consecutive number | |
710 // of empty regions will consider them empty and try to | |
711 // re-allocate them. We can extend is_empty() to also include | |
712 // !continuesHumongous(), but it is easier to just update the top | |
713 // fields here. The way we set top for all regions (i.e., top == | |
714 // end for all regions but the last one, top == new_top for the | |
715 // last one) is actually used when we will free up the humongous | |
716 // region in free_humongous_region(). | |
717 hr = NULL; | |
718 for (int i = first + 1; i < last; ++i) { | |
719 hr = _hrs->at(i); | |
720 if ((i + 1) == last) { | |
721 // last continues humongous region | |
722 assert(hr->bottom() < new_top && new_top <= hr->end(), | |
723 "new_top should fall on this region"); | |
724 hr->set_top(new_top); | |
725 } else { | |
726 // not last one | |
727 assert(new_top > hr->end(), "new_top should be above this region"); | |
728 hr->set_top(hr->end()); | |
729 } | |
730 } | |
731 // If we have continues humongous regions (hr != NULL), then the | |
732 // end of the last one should match new_end and its top should | |
733 // match new_top. | |
734 assert(hr == NULL || | |
735 (hr->end() == new_end && hr->top() == new_top), "sanity"); | |
736 | |
737 assert(first_hr->used() == word_size * HeapWordSize, "invariant"); | |
738 _summary_bytes_used += first_hr->used(); | |
739 _humongous_set.add(first_hr); | |
740 | |
741 return new_obj; | |
742 } | |
743 | |
342 | 744 // If could fit into free regions w/o expansion, try. |
745 // Otherwise, if can expand, do so. | |
746 // Otherwise, if using ex regions might help, try with ex given back. | |
1973 | 747 HeapWord* G1CollectedHeap::humongous_obj_allocate(size_t word_size) { |
2152 | 748 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
749 | |
750 verify_region_sets_optional(); | |
342 | 751 |
752 size_t num_regions = | |
1973 | 753 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; |
342 | 754 size_t x_size = expansion_regions(); |
2152 | 755 size_t fs = _hrs->free_suffix(); |
756 int first = humongous_obj_allocate_find_first(num_regions, word_size); | |
757 if (first == -1) { | |
758 // The only thing we can do now is attempt expansion. | |
342 | 759 if (fs + x_size >= num_regions) { |
2188
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760 // If the number of regions we're trying to allocate for this |
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761 // object is at most the number of regions in the free suffix, |
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762 // then the call to humongous_obj_allocate_find_first() above |
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763 // should have succeeded and we wouldn't be here. |
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764 // |
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765 // We should only be trying to expand when the free suffix is |
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766 // not sufficient for the object _and_ we have some expansion |
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767 // room available. |
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768 assert(num_regions > fs, "earlier allocation should have succeeded"); |
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769 |
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770 if (expand((num_regions - fs) * HeapRegion::GrainBytes)) { |
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771 first = humongous_obj_allocate_find_first(num_regions, word_size); |
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772 // If the expansion was successful then the allocation |
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773 // should have been successful. |
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774 assert(first != -1, "this should have worked"); |
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775 } |
2152 | 776 } |
777 } | |
778 | |
2361 | 779 HeapWord* result = NULL; |
2152 | 780 if (first != -1) { |
2361 | 781 result = |
782 humongous_obj_allocate_initialize_regions(first, num_regions, word_size); | |
783 assert(result != NULL, "it should always return a valid result"); | |
2152 | 784 } |
785 | |
786 verify_region_sets_optional(); | |
2361 | 787 |
788 return result; | |
342 | 789 } |
790 | |
1973 | 791 void |
792 G1CollectedHeap::retire_cur_alloc_region(HeapRegion* cur_alloc_region) { | |
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793 // Other threads might still be trying to allocate using CASes out |
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794 // of the region we are retiring, as they can do so without holding |
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795 // the Heap_lock. So we first have to make sure that noone else can |
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796 // allocate in it by doing a maximal allocation. Even if our CAS |
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797 // attempt fails a few times, we'll succeed sooner or later given |
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798 // that a failed CAS attempt mean that the region is getting closed |
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799 // to being full (someone else succeeded in allocating into it). |
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800 size_t free_word_size = cur_alloc_region->free() / HeapWordSize; |
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801 |
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802 // This is the minimum free chunk we can turn into a dummy |
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803 // object. If the free space falls below this, then noone can |
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804 // allocate in this region anyway (all allocation requests will be |
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805 // of a size larger than this) so we won't have to perform the dummy |
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806 // allocation. |
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807 size_t min_word_size_to_fill = CollectedHeap::min_fill_size(); |
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808 |
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809 while (free_word_size >= min_word_size_to_fill) { |
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810 HeapWord* dummy = |
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811 cur_alloc_region->par_allocate_no_bot_updates(free_word_size); |
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812 if (dummy != NULL) { |
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813 // If the allocation was successful we should fill in the space. |
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814 CollectedHeap::fill_with_object(dummy, free_word_size); |
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815 break; |
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816 } |
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817 |
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818 free_word_size = cur_alloc_region->free() / HeapWordSize; |
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819 // It's also possible that someone else beats us to the |
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820 // allocation and they fill up the region. In that case, we can |
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821 // just get out of the loop |
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822 } |
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823 assert(cur_alloc_region->free() / HeapWordSize < min_word_size_to_fill, |
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824 "sanity"); |
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825 |
1973 | 826 retire_cur_alloc_region_common(cur_alloc_region); |
827 assert(_cur_alloc_region == NULL, "post-condition"); | |
828 } | |
829 | |
830 // See the comment in the .hpp file about the locking protocol and | |
831 // assumptions of this method (and other related ones). | |
342 | 832 HeapWord* |
1973 | 833 G1CollectedHeap::replace_cur_alloc_region_and_allocate(size_t word_size, |
834 bool at_safepoint, | |
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835 bool do_dirtying, |
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836 bool can_expand) { |
2152 | 837 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
1973 | 838 assert(_cur_alloc_region == NULL, |
839 "replace_cur_alloc_region_and_allocate() should only be called " | |
840 "after retiring the previous current alloc region"); | |
841 assert(SafepointSynchronize::is_at_safepoint() == at_safepoint, | |
842 "at_safepoint and is_at_safepoint() should be a tautology"); | |
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843 assert(!can_expand || g1_policy()->can_expand_young_list(), |
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844 "we should not call this method with can_expand == true if " |
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845 "we are not allowed to expand the young gen"); |
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846 |
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847 if (can_expand || !g1_policy()->is_young_list_full()) { |
2152 | 848 HeapRegion* new_cur_alloc_region = new_alloc_region(word_size); |
1973 | 849 if (new_cur_alloc_region != NULL) { |
850 assert(new_cur_alloc_region->is_empty(), | |
851 "the newly-allocated region should be empty, " | |
852 "as right now we only allocate new regions out of the free list"); | |
853 g1_policy()->update_region_num(true /* next_is_young */); | |
854 set_region_short_lived_locked(new_cur_alloc_region); | |
855 | |
856 assert(!new_cur_alloc_region->isHumongous(), | |
857 "Catch a regression of this bug."); | |
858 | |
859 // We need to ensure that the stores to _cur_alloc_region and, | |
860 // subsequently, to top do not float above the setting of the | |
861 // young type. | |
862 OrderAccess::storestore(); | |
863 | |
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864 // Now, perform the allocation out of the region we just |
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865 // allocated. Note that noone else can access that region at |
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866 // this point (as _cur_alloc_region has not been updated yet), |
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867 // so we can just go ahead and do the allocation without any |
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868 // atomics (and we expect this allocation attempt to |
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869 // suceeded). Given that other threads can attempt an allocation |
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870 // with a CAS and without needing the Heap_lock, if we assigned |
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871 // the new region to _cur_alloc_region before first allocating |
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872 // into it other threads might have filled up the new region |
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873 // before we got a chance to do the allocation ourselves. In |
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874 // that case, we would have needed to retire the region, grab a |
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875 // new one, and go through all this again. Allocating out of the |
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876 // new region before assigning it to _cur_alloc_region avoids |
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877 // all this. |
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878 HeapWord* result = |
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879 new_cur_alloc_region->allocate_no_bot_updates(word_size); |
1973 | 880 assert(result != NULL, "we just allocate out of an empty region " |
881 "so allocation should have been successful"); | |
882 assert(is_in(result), "result should be in the heap"); | |
883 | |
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884 // Now make sure that the store to _cur_alloc_region does not |
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885 // float above the store to top. |
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886 OrderAccess::storestore(); |
1973 | 887 _cur_alloc_region = new_cur_alloc_region; |
888 | |
889 if (!at_safepoint) { | |
890 Heap_lock->unlock(); | |
891 } | |
892 | |
893 // do the dirtying, if necessary, after we release the Heap_lock | |
894 if (do_dirtying) { | |
895 dirty_young_block(result, word_size); | |
896 } | |
897 return result; | |
898 } | |
899 } | |
900 | |
901 assert(_cur_alloc_region == NULL, "we failed to allocate a new current " | |
902 "alloc region, it should still be NULL"); | |
2152 | 903 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
1973 | 904 return NULL; |
905 } | |
906 | |
907 // See the comment in the .hpp file about the locking protocol and | |
908 // assumptions of this method (and other related ones). | |
909 HeapWord* | |
910 G1CollectedHeap::attempt_allocation_slow(size_t word_size) { | |
911 assert_heap_locked_and_not_at_safepoint(); | |
912 assert(!isHumongous(word_size), "attempt_allocation_slow() should not be " | |
913 "used for humongous allocations"); | |
914 | |
2152 | 915 // We should only reach here when we were unable to allocate |
916 // otherwise. So, we should have not active current alloc region. | |
917 assert(_cur_alloc_region == NULL, "current alloc region should be NULL"); | |
918 | |
1973 | 919 // We will loop while succeeded is false, which means that we tried |
920 // to do a collection, but the VM op did not succeed. So, when we | |
921 // exit the loop, either one of the allocation attempts was | |
922 // successful, or we succeeded in doing the VM op but which was | |
923 // unable to allocate after the collection. | |
924 for (int try_count = 1; /* we'll return or break */; try_count += 1) { | |
925 bool succeeded = true; | |
926 | |
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927 // Every time we go round the loop we should be holding the Heap_lock. |
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928 assert_heap_locked(); |
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929 |
1973 | 930 if (GC_locker::is_active_and_needs_gc()) { |
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931 // We are locked out of GC because of the GC locker. We can |
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932 // allocate a new region only if we can expand the young gen. |
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933 |
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934 if (g1_policy()->can_expand_young_list()) { |
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935 // Yes, we are allowed to expand the young gen. Let's try to |
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936 // allocate a new current alloc region. |
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937 HeapWord* result = |
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938 replace_cur_alloc_region_and_allocate(word_size, |
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939 false, /* at_safepoint */ |
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940 true, /* do_dirtying */ |
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941 true /* can_expand */); |
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942 if (result != NULL) { |
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943 assert_heap_not_locked(); |
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944 return result; |
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945 } |
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946 } |
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947 // We could not expand the young gen further (or we could but we |
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948 // failed to allocate a new region). We'll stall until the GC |
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949 // locker forces a GC. |
1973 | 950 |
951 // If this thread is not in a jni critical section, we stall | |
952 // the requestor until the critical section has cleared and | |
953 // GC allowed. When the critical section clears, a GC is | |
954 // initiated by the last thread exiting the critical section; so | |
955 // we retry the allocation sequence from the beginning of the loop, | |
956 // rather than causing more, now probably unnecessary, GC attempts. | |
957 JavaThread* jthr = JavaThread::current(); | |
958 assert(jthr != NULL, "sanity"); | |
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959 if (jthr->in_critical()) { |
1973 | 960 if (CheckJNICalls) { |
961 fatal("Possible deadlock due to allocating while" | |
962 " in jni critical section"); | |
963 } | |
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964 // We are returning NULL so the protocol is that we're still |
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965 // holding the Heap_lock. |
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966 assert_heap_locked(); |
1973 | 967 return NULL; |
1666
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968 } |
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969 |
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970 Heap_lock->unlock(); |
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971 GC_locker::stall_until_clear(); |
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972 |
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973 // No need to relock the Heap_lock. We'll fall off to the code |
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974 // below the else-statement which assumes that we are not |
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975 // holding the Heap_lock. |
1973 | 976 } else { |
977 // We are not locked out. So, let's try to do a GC. The VM op | |
978 // will retry the allocation before it completes. | |
979 | |
980 // Read the GC count while holding the Heap_lock | |
981 unsigned int gc_count_before = SharedHeap::heap()->total_collections(); | |
982 | |
983 Heap_lock->unlock(); | |
984 | |
985 HeapWord* result = | |
986 do_collection_pause(word_size, gc_count_before, &succeeded); | |
987 assert_heap_not_locked(); | |
988 if (result != NULL) { | |
989 assert(succeeded, "the VM op should have succeeded"); | |
990 | |
991 // Allocations that take place on VM operations do not do any | |
992 // card dirtying and we have to do it here. | |
993 dirty_young_block(result, word_size); | |
994 return result; | |
995 } | |
996 } | |
997 | |
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998 // Both paths that get us here from above unlock the Heap_lock. |
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999 assert_heap_not_locked(); |
1973 | 1000 |
1001 // We can reach here when we were unsuccessful in doing a GC, | |
1002 // because another thread beat us to it, or because we were locked | |
1003 // out of GC due to the GC locker. In either case a new alloc | |
1004 // region might be available so we will retry the allocation. | |
1005 HeapWord* result = attempt_allocation(word_size); | |
1006 if (result != NULL) { | |
1007 assert_heap_not_locked(); | |
1008 return result; | |
1009 } | |
1010 | |
1011 // So far our attempts to allocate failed. The only time we'll go | |
1012 // around the loop and try again is if we tried to do a GC and the | |
1013 // VM op that we tried to schedule was not successful because | |
1014 // another thread beat us to it. If that happened it's possible | |
1015 // that by the time we grabbed the Heap_lock again and tried to | |
1016 // allocate other threads filled up the young generation, which | |
1017 // means that the allocation attempt after the GC also failed. So, | |
1018 // it's worth trying to schedule another GC pause. | |
1019 if (succeeded) { | |
1020 break; | |
1021 } | |
1022 | |
1023 // Give a warning if we seem to be looping forever. | |
1024 if ((QueuedAllocationWarningCount > 0) && | |
1025 (try_count % QueuedAllocationWarningCount == 0)) { | |
1026 warning("G1CollectedHeap::attempt_allocation_slow() " | |
1027 "retries %d times", try_count); | |
342 | 1028 } |
1029 } | |
1030 | |
1973 | 1031 assert_heap_locked(); |
1032 return NULL; | |
1033 } | |
1034 | |
1035 // See the comment in the .hpp file about the locking protocol and | |
1036 // assumptions of this method (and other related ones). | |
1037 HeapWord* | |
1038 G1CollectedHeap::attempt_allocation_humongous(size_t word_size, | |
1039 bool at_safepoint) { | |
1040 // This is the method that will allocate a humongous object. All | |
1041 // allocation paths that attempt to allocate a humongous object | |
1042 // should eventually reach here. Currently, the only paths are from | |
1043 // mem_allocate() and attempt_allocation_at_safepoint(). | |
2152 | 1044 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
1973 | 1045 assert(isHumongous(word_size), "attempt_allocation_humongous() " |
1046 "should only be used for humongous allocations"); | |
1047 assert(SafepointSynchronize::is_at_safepoint() == at_safepoint, | |
1048 "at_safepoint and is_at_safepoint() should be a tautology"); | |
1049 | |
1050 HeapWord* result = NULL; | |
1051 | |
1052 // We will loop while succeeded is false, which means that we tried | |
1053 // to do a collection, but the VM op did not succeed. So, when we | |
1054 // exit the loop, either one of the allocation attempts was | |
1055 // successful, or we succeeded in doing the VM op but which was | |
1056 // unable to allocate after the collection. | |
1057 for (int try_count = 1; /* we'll return or break */; try_count += 1) { | |
1058 bool succeeded = true; | |
1059 | |
1060 // Given that humongous objects are not allocated in young | |
1061 // regions, we'll first try to do the allocation without doing a | |
1062 // collection hoping that there's enough space in the heap. | |
1063 result = humongous_obj_allocate(word_size); | |
1064 assert(_cur_alloc_region == NULL || !_cur_alloc_region->isHumongous(), | |
1065 "catch a regression of this bug."); | |
1066 if (result != NULL) { | |
1067 if (!at_safepoint) { | |
1068 // If we're not at a safepoint, unlock the Heap_lock. | |
1069 Heap_lock->unlock(); | |
1070 } | |
1071 return result; | |
1072 } | |
1073 | |
1074 // If we failed to allocate the humongous object, we should try to | |
1075 // do a collection pause (if we're allowed) in case it reclaims | |
1076 // enough space for the allocation to succeed after the pause. | |
1077 if (!at_safepoint) { | |
1078 // Read the GC count while holding the Heap_lock | |
1079 unsigned int gc_count_before = SharedHeap::heap()->total_collections(); | |
1080 | |
1081 // If we're allowed to do a collection we're not at a | |
1082 // safepoint, so it is safe to unlock the Heap_lock. | |
342 | 1083 Heap_lock->unlock(); |
1973 | 1084 |
1085 result = do_collection_pause(word_size, gc_count_before, &succeeded); | |
1086 assert_heap_not_locked(); | |
1087 if (result != NULL) { | |
1088 assert(succeeded, "the VM op should have succeeded"); | |
1089 return result; | |
1090 } | |
1091 | |
1092 // If we get here, the VM operation either did not succeed | |
1093 // (i.e., another thread beat us to it) or it succeeded but | |
1094 // failed to allocate the object. | |
1095 | |
1096 // If we're allowed to do a collection we're not at a | |
1097 // safepoint, so it is safe to lock the Heap_lock. | |
1098 Heap_lock->lock(); | |
1099 } | |
1100 | |
1101 assert(result == NULL, "otherwise we should have exited the loop earlier"); | |
1102 | |
1103 // So far our attempts to allocate failed. The only time we'll go | |
1104 // around the loop and try again is if we tried to do a GC and the | |
1105 // VM op that we tried to schedule was not successful because | |
1106 // another thread beat us to it. That way it's possible that some | |
1107 // space was freed up by the thread that successfully scheduled a | |
1108 // GC. So it's worth trying to allocate again. | |
1109 if (succeeded) { | |
1110 break; | |
342 | 1111 } |
1112 | |
1973 | 1113 // Give a warning if we seem to be looping forever. |
1114 if ((QueuedAllocationWarningCount > 0) && | |
1115 (try_count % QueuedAllocationWarningCount == 0)) { | |
1116 warning("G1CollectedHeap::attempt_allocation_humongous " | |
1117 "retries %d times", try_count); | |
1118 } | |
1119 } | |
1120 | |
2152 | 1121 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
1973 | 1122 return NULL; |
1123 } | |
1124 | |
1125 HeapWord* G1CollectedHeap::attempt_allocation_at_safepoint(size_t word_size, | |
1126 bool expect_null_cur_alloc_region) { | |
2152 | 1127 assert_at_safepoint(true /* should_be_vm_thread */); |
1973 | 1128 assert(_cur_alloc_region == NULL || !expect_null_cur_alloc_region, |
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1129 err_msg("the current alloc region was unexpectedly found " |
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1130 "to be non-NULL, cur alloc region: "PTR_FORMAT" " |
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1131 "expect_null_cur_alloc_region: %d word_size: "SIZE_FORMAT, |
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1132 _cur_alloc_region, expect_null_cur_alloc_region, word_size)); |
1973 | 1133 |
1134 if (!isHumongous(word_size)) { | |
1135 if (!expect_null_cur_alloc_region) { | |
1136 HeapRegion* cur_alloc_region = _cur_alloc_region; | |
1137 if (cur_alloc_region != NULL) { | |
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1138 // We are at a safepoint so no reason to use the MT-safe version. |
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1139 HeapWord* result = cur_alloc_region->allocate_no_bot_updates(word_size); |
1973 | 1140 if (result != NULL) { |
1141 assert(is_in(result), "result should be in the heap"); | |
1142 | |
1143 // We will not do any dirtying here. This is guaranteed to be | |
1144 // called during a safepoint and the thread that scheduled the | |
1145 // pause will do the dirtying if we return a non-NULL result. | |
1146 return result; | |
1147 } | |
1148 | |
1149 retire_cur_alloc_region_common(cur_alloc_region); | |
1150 } | |
342 | 1151 } |
1973 | 1152 |
1153 assert(_cur_alloc_region == NULL, | |
1154 "at this point we should have no cur alloc region"); | |
1155 return replace_cur_alloc_region_and_allocate(word_size, | |
1156 true, /* at_safepoint */ | |
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1157 false /* do_dirtying */, |
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1158 false /* can_expand */); |
1973 | 1159 } else { |
1160 return attempt_allocation_humongous(word_size, | |
1161 true /* at_safepoint */); | |
1162 } | |
1163 | |
1164 ShouldNotReachHere(); | |
1165 } | |
1166 | |
1167 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { | |
1168 assert_heap_not_locked_and_not_at_safepoint(); | |
1169 assert(!isHumongous(word_size), "we do not allow TLABs of humongous size"); | |
1170 | |
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1171 // First attempt: Try allocating out of the current alloc region |
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1172 // using a CAS. If that fails, take the Heap_lock and retry the |
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1173 // allocation, potentially replacing the current alloc region. |
1973 | 1174 HeapWord* result = attempt_allocation(word_size); |
1175 if (result != NULL) { | |
1176 assert_heap_not_locked(); | |
1177 return result; | |
1178 } | |
1179 | |
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1180 // Second attempt: Go to the slower path where we might try to |
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1181 // schedule a collection. |
1973 | 1182 result = attempt_allocation_slow(word_size); |
1183 if (result != NULL) { | |
1184 assert_heap_not_locked(); | |
1185 return result; | |
1186 } | |
1187 | |
1188 assert_heap_locked(); | |
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1189 // Need to unlock the Heap_lock before returning. |
1973 | 1190 Heap_lock->unlock(); |
1191 return NULL; | |
342 | 1192 } |
1193 | |
1194 HeapWord* | |
1195 G1CollectedHeap::mem_allocate(size_t word_size, | |
1196 bool is_noref, | |
1197 bool is_tlab, | |
1973 | 1198 bool* gc_overhead_limit_was_exceeded) { |
1199 assert_heap_not_locked_and_not_at_safepoint(); | |
1200 assert(!is_tlab, "mem_allocate() this should not be called directly " | |
1201 "to allocate TLABs"); | |
342 | 1202 |
1203 // Loop until the allocation is satisified, | |
1204 // or unsatisfied after GC. | |
1973 | 1205 for (int try_count = 1; /* we'll return */; try_count += 1) { |
1206 unsigned int gc_count_before; | |
342 | 1207 { |
1973 | 1208 if (!isHumongous(word_size)) { |
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1209 // First attempt: Try allocating out of the current alloc region |
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1210 // using a CAS. If that fails, take the Heap_lock and retry the |
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1211 // allocation, potentially replacing the current alloc region. |
1973 | 1212 HeapWord* result = attempt_allocation(word_size); |
1213 if (result != NULL) { | |
1214 assert_heap_not_locked(); | |
1215 return result; | |
1216 } | |
1217 | |
1218 assert_heap_locked(); | |
1219 | |
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1220 // Second attempt: Go to the slower path where we might try to |
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1221 // schedule a collection. |
1973 | 1222 result = attempt_allocation_slow(word_size); |
1223 if (result != NULL) { | |
1224 assert_heap_not_locked(); | |
1225 return result; | |
1226 } | |
1227 } else { | |
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1228 // attempt_allocation_humongous() requires the Heap_lock to be held. |
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1229 Heap_lock->lock(); |
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1230 |
1973 | 1231 HeapWord* result = attempt_allocation_humongous(word_size, |
1232 false /* at_safepoint */); | |
1233 if (result != NULL) { | |
1234 assert_heap_not_locked(); | |
1235 return result; | |
1236 } | |
342 | 1237 } |
1973 | 1238 |
1239 assert_heap_locked(); | |
342 | 1240 // Read the gc count while the heap lock is held. |
1241 gc_count_before = SharedHeap::heap()->total_collections(); | |
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1242 |
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1243 // Release the Heap_lock before attempting the collection. |
342 | 1244 Heap_lock->unlock(); |
1245 } | |
1246 | |
1247 // Create the garbage collection operation... | |
1973 | 1248 VM_G1CollectForAllocation op(gc_count_before, word_size); |
342 | 1249 // ...and get the VM thread to execute it. |
1250 VMThread::execute(&op); | |
1973 | 1251 |
1252 assert_heap_not_locked(); | |
1253 if (op.prologue_succeeded() && op.pause_succeeded()) { | |
1254 // If the operation was successful we'll return the result even | |
1255 // if it is NULL. If the allocation attempt failed immediately | |
1256 // after a Full GC, it's unlikely we'll be able to allocate now. | |
1257 HeapWord* result = op.result(); | |
1258 if (result != NULL && !isHumongous(word_size)) { | |
1259 // Allocations that take place on VM operations do not do any | |
1260 // card dirtying and we have to do it here. We only have to do | |
1261 // this for non-humongous allocations, though. | |
1262 dirty_young_block(result, word_size); | |
1263 } | |
342 | 1264 return result; |
1973 | 1265 } else { |
1266 assert(op.result() == NULL, | |
1267 "the result should be NULL if the VM op did not succeed"); | |
342 | 1268 } |
1269 | |
1270 // Give a warning if we seem to be looping forever. | |
1271 if ((QueuedAllocationWarningCount > 0) && | |
1272 (try_count % QueuedAllocationWarningCount == 0)) { | |
1973 | 1273 warning("G1CollectedHeap::mem_allocate retries %d times", try_count); |
342 | 1274 } |
1275 } | |
1973 | 1276 |
1277 ShouldNotReachHere(); | |
342 | 1278 } |
1279 | |
1280 void G1CollectedHeap::abandon_cur_alloc_region() { | |
2152 | 1281 assert_at_safepoint(true /* should_be_vm_thread */); |
1282 | |
1283 HeapRegion* cur_alloc_region = _cur_alloc_region; | |
1284 if (cur_alloc_region != NULL) { | |
1285 assert(!cur_alloc_region->is_empty(), | |
1286 "the current alloc region can never be empty"); | |
1287 assert(cur_alloc_region->is_young(), | |
1288 "the current alloc region should be young"); | |
1289 | |
1290 retire_cur_alloc_region_common(cur_alloc_region); | |
1291 } | |
1292 assert(_cur_alloc_region == NULL, "post-condition"); | |
342 | 1293 } |
1294 | |
636 | 1295 void G1CollectedHeap::abandon_gc_alloc_regions() { |
1296 // first, make sure that the GC alloc region list is empty (it should!) | |
1297 assert(_gc_alloc_region_list == NULL, "invariant"); | |
1298 release_gc_alloc_regions(true /* totally */); | |
1299 } | |
1300 | |
342 | 1301 class PostMCRemSetClearClosure: public HeapRegionClosure { |
1302 ModRefBarrierSet* _mr_bs; | |
1303 public: | |
1304 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
1305 bool doHeapRegion(HeapRegion* r) { | |
1306 r->reset_gc_time_stamp(); | |
1307 if (r->continuesHumongous()) | |
1308 return false; | |
1309 HeapRegionRemSet* hrrs = r->rem_set(); | |
1310 if (hrrs != NULL) hrrs->clear(); | |
1311 // You might think here that we could clear just the cards | |
1312 // corresponding to the used region. But no: if we leave a dirty card | |
1313 // in a region we might allocate into, then it would prevent that card | |
1314 // from being enqueued, and cause it to be missed. | |
1315 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
1316 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
1317 return false; | |
1318 } | |
1319 }; | |
1320 | |
1321 | |
1322 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
1323 ModRefBarrierSet* _mr_bs; | |
1324 public: | |
1325 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
1326 bool doHeapRegion(HeapRegion* r) { | |
1327 if (r->continuesHumongous()) return false; | |
1328 if (r->used_region().word_size() != 0) { | |
1329 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
1330 } | |
1331 return false; | |
1332 } | |
1333 }; | |
1334 | |
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1335 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
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1336 G1CollectedHeap* _g1h; |
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1337 UpdateRSOopClosure _cl; |
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1338 int _worker_i; |
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1339 public: |
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1340 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
1861 | 1341 _cl(g1->g1_rem_set(), worker_i), |
626
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1342 _worker_i(worker_i), |
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1343 _g1h(g1) |
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1344 { } |
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1345 |
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1346 bool doHeapRegion(HeapRegion* r) { |
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1347 if (!r->continuesHumongous()) { |
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1348 _cl.set_from(r); |
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1349 r->oop_iterate(&_cl); |
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1350 } |
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1351 return false; |
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1352 } |
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1353 }; |
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1354 |
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1355 class ParRebuildRSTask: public AbstractGangTask { |
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1356 G1CollectedHeap* _g1; |
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1357 public: |
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1358 ParRebuildRSTask(G1CollectedHeap* g1) |
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1359 : AbstractGangTask("ParRebuildRSTask"), |
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1360 _g1(g1) |
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1361 { } |
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1362 |
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1363 void work(int i) { |
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1364 RebuildRSOutOfRegionClosure rebuild_rs(_g1, i); |
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1365 _g1->heap_region_par_iterate_chunked(&rebuild_rs, i, |
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1366 HeapRegion::RebuildRSClaimValue); |
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1367 } |
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1368 }; |
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1369 |
1973 | 1370 bool G1CollectedHeap::do_collection(bool explicit_gc, |
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1371 bool clear_all_soft_refs, |
342 | 1372 size_t word_size) { |
2152 | 1373 assert_at_safepoint(true /* should_be_vm_thread */); |
1374 | |
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1375 if (GC_locker::check_active_before_gc()) { |
1973 | 1376 return false; |
1359
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1377 } |
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1378 |
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1379 SvcGCMarker sgcm(SvcGCMarker::FULL); |
342 | 1380 ResourceMark rm; |
1381 | |
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1382 if (PrintHeapAtGC) { |
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1383 Universe::print_heap_before_gc(); |
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1384 } |
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1385 |
2152 | 1386 verify_region_sets_optional(); |
342 | 1387 |
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1388 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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1389 collector_policy()->should_clear_all_soft_refs(); |
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1390 |
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1391 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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1392 |
342 | 1393 { |
1394 IsGCActiveMark x; | |
1395 | |
1396 // Timing | |
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1397 bool system_gc = (gc_cause() == GCCause::_java_lang_system_gc); |
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1398 assert(!system_gc || explicit_gc, "invariant"); |
342 | 1399 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
1400 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
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1401 TraceTime t(system_gc ? "Full GC (System.gc())" : "Full GC", |
1387
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1402 PrintGC, true, gclog_or_tty); |
342 | 1403 |
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1404 TraceMemoryManagerStats tms(true /* fullGC */); |
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1405 |
342 | 1406 double start = os::elapsedTime(); |
1407 g1_policy()->record_full_collection_start(); | |
1408 | |
2152 | 1409 wait_while_free_regions_coming(); |
2361 | 1410 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 1411 |
342 | 1412 gc_prologue(true); |
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1413 increment_total_collections(true /* full gc */); |
342 | 1414 |
1415 size_t g1h_prev_used = used(); | |
1416 assert(used() == recalculate_used(), "Should be equal"); | |
1417 | |
1418 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
1419 HandleMark hm; // Discard invalid handles created during verification | |
1420 prepare_for_verify(); | |
1421 gclog_or_tty->print(" VerifyBeforeGC:"); | |
1422 Universe::verify(true); | |
1423 } | |
1424 | |
1425 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
1426 | |
1427 // We want to discover references, but not process them yet. | |
1428 // This mode is disabled in | |
1429 // instanceRefKlass::process_discovered_references if the | |
1430 // generation does some collection work, or | |
1431 // instanceRefKlass::enqueue_discovered_references if the | |
1432 // generation returns without doing any work. | |
1433 ref_processor()->disable_discovery(); | |
1434 ref_processor()->abandon_partial_discovery(); | |
1435 ref_processor()->verify_no_references_recorded(); | |
1436 | |
1437 // Abandon current iterations of concurrent marking and concurrent | |
1438 // refinement, if any are in progress. | |
1439 concurrent_mark()->abort(); | |
1440 | |
1441 // Make sure we'll choose a new allocation region afterwards. | |
1442 abandon_cur_alloc_region(); | |
636 | 1443 abandon_gc_alloc_regions(); |
342 | 1444 assert(_cur_alloc_region == NULL, "Invariant."); |
1861 | 1445 g1_rem_set()->cleanupHRRS(); |
342 | 1446 tear_down_region_lists(); |
1394
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1447 |
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1448 // We may have added regions to the current incremental collection |
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1449 // set between the last GC or pause and now. We need to clear the |
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1450 // incremental collection set and then start rebuilding it afresh |
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1451 // after this full GC. |
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1452 abandon_collection_set(g1_policy()->inc_cset_head()); |
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1453 g1_policy()->clear_incremental_cset(); |
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1454 g1_policy()->stop_incremental_cset_building(); |
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1455 |
342 | 1456 if (g1_policy()->in_young_gc_mode()) { |
1457 empty_young_list(); | |
1458 g1_policy()->set_full_young_gcs(true); | |
1459 } | |
1460 | |
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1461 // See the comment in G1CollectedHeap::ref_processing_init() about |
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1462 // how reference processing currently works in G1. |
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1463 |
342 | 1464 // Temporarily make reference _discovery_ single threaded (non-MT). |
1465 ReferenceProcessorMTMutator rp_disc_ser(ref_processor(), false); | |
1466 | |
1467 // Temporarily make refs discovery atomic | |
1468 ReferenceProcessorAtomicMutator rp_disc_atomic(ref_processor(), true); | |
1469 | |
1470 // Temporarily clear _is_alive_non_header | |
1471 ReferenceProcessorIsAliveMutator rp_is_alive_null(ref_processor(), NULL); | |
1472 | |
1473 ref_processor()->enable_discovery(); | |
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1474 ref_processor()->setup_policy(do_clear_all_soft_refs); |
342 | 1475 |
1476 // Do collection work | |
1477 { | |
1478 HandleMark hm; // Discard invalid handles created during gc | |
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1479 G1MarkSweep::invoke_at_safepoint(ref_processor(), do_clear_all_soft_refs); |
342 | 1480 } |
2152 | 1481 assert(free_regions() == 0, "we should not have added any free regions"); |
342 | 1482 rebuild_region_lists(); |
1483 | |
1484 _summary_bytes_used = recalculate_used(); | |
1485 | |
1486 ref_processor()->enqueue_discovered_references(); | |
1487 | |
1488 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
1489 | |
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1490 MemoryService::track_memory_usage(); |
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1491 |
342 | 1492 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
1493 HandleMark hm; // Discard invalid handles created during verification | |
1494 gclog_or_tty->print(" VerifyAfterGC:"); | |
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1495 prepare_for_verify(); |
342 | 1496 Universe::verify(false); |
1497 } | |
1498 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); | |
1499 | |
1500 reset_gc_time_stamp(); | |
1501 // Since everything potentially moved, we will clear all remembered | |
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1502 // sets, and clear all cards. Later we will rebuild remebered |
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1503 // sets. We will also reset the GC time stamps of the regions. |
342 | 1504 PostMCRemSetClearClosure rs_clear(mr_bs()); |
1505 heap_region_iterate(&rs_clear); | |
1506 | |
1507 // Resize the heap if necessary. | |
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1508 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
342 | 1509 |
1510 if (_cg1r->use_cache()) { | |
1511 _cg1r->clear_and_record_card_counts(); | |
1512 _cg1r->clear_hot_cache(); | |
1513 } | |
1514 | |
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1515 // Rebuild remembered sets of all regions. |
1833
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1516 |
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1517 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1518 ParRebuildRSTask rebuild_rs_task(this); |
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1519 assert(check_heap_region_claim_values( |
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1520 HeapRegion::InitialClaimValue), "sanity check"); |
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1521 set_par_threads(workers()->total_workers()); |
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1522 workers()->run_task(&rebuild_rs_task); |
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1523 set_par_threads(0); |
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1524 assert(check_heap_region_claim_values( |
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1525 HeapRegion::RebuildRSClaimValue), "sanity check"); |
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1526 reset_heap_region_claim_values(); |
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1527 } else { |
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1528 RebuildRSOutOfRegionClosure rebuild_rs(this); |
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6760309: G1: update remembered sets during Full GCs
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|
1529 heap_region_iterate(&rebuild_rs); |
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|
1530 } |
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|
1531 |
342 | 1532 if (PrintGC) { |
1533 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
1534 } | |
1535 | |
1536 if (true) { // FIXME | |
1537 // Ask the permanent generation to adjust size for full collections | |
1538 perm()->compute_new_size(); | |
1539 } | |
1540 | |
1394
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1541 // Start a new incremental collection set for the next pause |
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1542 assert(g1_policy()->collection_set() == NULL, "must be"); |
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|
1543 g1_policy()->start_incremental_cset_building(); |
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|
1544 |
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|
1545 // Clear the _cset_fast_test bitmap in anticipation of adding |
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1546 // regions to the incremental collection set for the next |
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|
1547 // evacuation pause. |
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|
1548 clear_cset_fast_test(); |
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|
1549 |
342 | 1550 double end = os::elapsedTime(); |
1551 g1_policy()->record_full_collection_end(); | |
1552 | |
546
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6690928: Use spinning in combination with yields for workstealing termination.
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|
1553 #ifdef TRACESPINNING |
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6690928: Use spinning in combination with yields for workstealing termination.
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|
1554 ParallelTaskTerminator::print_termination_counts(); |
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6690928: Use spinning in combination with yields for workstealing termination.
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1555 #endif |
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1556 |
342 | 1557 gc_epilogue(true); |
1558 | |
794 | 1559 // Discard all rset updates |
1560 JavaThread::dirty_card_queue_set().abandon_logs(); | |
616
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|
1561 assert(!G1DeferredRSUpdate |
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|
1562 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
342 | 1563 } |
1564 | |
1565 if (g1_policy()->in_young_gc_mode()) { | |
1566 _young_list->reset_sampled_info(); | |
1394
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1567 // At this point there should be no regions in the |
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1568 // entire heap tagged as young. |
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1569 assert( check_young_list_empty(true /* check_heap */), |
342 | 1570 "young list should be empty at this point"); |
1571 } | |
838
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|
1572 |
1656
4e5661ba9d98
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|
1573 // Update the number of full collections that have been completed. |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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1574 increment_full_collections_completed(false /* concurrent */); |
1656
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|
1575 |
2152 | 1576 verify_region_sets_optional(); |
1577 | |
838
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1578 if (PrintHeapAtGC) { |
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1579 Universe::print_heap_after_gc(); |
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|
1580 } |
1973 | 1581 |
1582 return true; | |
342 | 1583 } |
1584 | |
1585 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
1973 | 1586 // do_collection() will return whether it succeeded in performing |
1587 // the GC. Currently, there is no facility on the | |
1588 // do_full_collection() API to notify the caller than the collection | |
1589 // did not succeed (e.g., because it was locked out by the GC | |
1590 // locker). So, right now, we'll ignore the return value. | |
1591 bool dummy = do_collection(true, /* explicit_gc */ | |
1592 clear_all_soft_refs, | |
1593 0 /* word_size */); | |
342 | 1594 } |
1595 | |
1596 // This code is mostly copied from TenuredGeneration. | |
1597 void | |
1598 G1CollectedHeap:: | |
1599 resize_if_necessary_after_full_collection(size_t word_size) { | |
1600 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
1601 | |
1602 // Include the current allocation, if any, and bytes that will be | |
1603 // pre-allocated to support collections, as "used". | |
1604 const size_t used_after_gc = used(); | |
1605 const size_t capacity_after_gc = capacity(); | |
1606 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
1607 | |
1717
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1608 // This is enforced in arguments.cpp. |
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1609 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
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1610 "otherwise the code below doesn't make sense"); |
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1611 |
342 | 1612 // We don't have floating point command-line arguments |
1717
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1613 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
342 | 1614 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
1717
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|
1615 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
342 | 1616 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
1617 | |
1717
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1618 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
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|
1619 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
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1620 |
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|
1621 // We have to be careful here as these two calculations can overflow |
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|
1622 // 32-bit size_t's. |
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|
1623 double used_after_gc_d = (double) used_after_gc; |
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|
1624 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
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|
1625 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
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|
1626 |
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|
1627 // Let's make sure that they are both under the max heap size, which |
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|
1628 // by default will make them fit into a size_t. |
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|
1629 double desired_capacity_upper_bound = (double) max_heap_size; |
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|
1630 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
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|
1631 desired_capacity_upper_bound); |
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|
1632 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
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|
1633 desired_capacity_upper_bound); |
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|
1634 |
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|
1635 // We can now safely turn them into size_t's. |
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|
1636 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
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|
1637 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
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|
1638 |
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|
1639 // This assert only makes sense here, before we adjust them |
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|
1640 // with respect to the min and max heap size. |
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1709
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|
1641 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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6959014: G1: assert(minimum_desired_capacity <= maximum_desired_capacity) failed: sanity check
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|
1642 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
688c3755d7af
6959014: G1: assert(minimum_desired_capacity <= maximum_desired_capacity) failed: sanity check
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1709
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|
1643 "maximum_desired_capacity = "SIZE_FORMAT, |
688c3755d7af
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1709
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|
1644 minimum_desired_capacity, maximum_desired_capacity)); |
688c3755d7af
6959014: G1: assert(minimum_desired_capacity <= maximum_desired_capacity) failed: sanity check
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|
1645 |
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|
1646 // Should not be greater than the heap max size. No need to adjust |
688c3755d7af
6959014: G1: assert(minimum_desired_capacity <= maximum_desired_capacity) failed: sanity check
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|
1647 // it with respect to the heap min size as it's a lower bound (i.e., |
688c3755d7af
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|
1648 // we'll try to make the capacity larger than it, not smaller). |
688c3755d7af
6959014: G1: assert(minimum_desired_capacity <= maximum_desired_capacity) failed: sanity check
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|
1649 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
688c3755d7af
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|
1650 // Should not be less than the heap min size. No need to adjust it |
688c3755d7af
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|
1651 // with respect to the heap max size as it's an upper bound (i.e., |
688c3755d7af
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|
1652 // we'll try to make the capacity smaller than it, not greater). |
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|
1653 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
342 | 1654 |
1655 if (PrintGC && Verbose) { | |
1717
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|
1656 const double free_percentage = |
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|
1657 (double) free_after_gc / (double) capacity_after_gc; |
342 | 1658 gclog_or_tty->print_cr("Computing new size after full GC "); |
1659 gclog_or_tty->print_cr(" " | |
1660 " minimum_free_percentage: %6.2f", | |
1661 minimum_free_percentage); | |
1662 gclog_or_tty->print_cr(" " | |
1663 " maximum_free_percentage: %6.2f", | |
1664 maximum_free_percentage); | |
1665 gclog_or_tty->print_cr(" " | |
1666 " capacity: %6.1fK" | |
1667 " minimum_desired_capacity: %6.1fK" | |
1668 " maximum_desired_capacity: %6.1fK", | |
1717
688c3755d7af
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|
1669 (double) capacity_after_gc / (double) K, |
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|
1670 (double) minimum_desired_capacity / (double) K, |
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|
1671 (double) maximum_desired_capacity / (double) K); |
342 | 1672 gclog_or_tty->print_cr(" " |
1717
688c3755d7af
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|
1673 " free_after_gc: %6.1fK" |
688c3755d7af
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|
1674 " used_after_gc: %6.1fK", |
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|
1675 (double) free_after_gc / (double) K, |
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|
1676 (double) used_after_gc / (double) K); |
342 | 1677 gclog_or_tty->print_cr(" " |
1678 " free_percentage: %6.2f", | |
1679 free_percentage); | |
1680 } | |
1717
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|
1681 if (capacity_after_gc < minimum_desired_capacity) { |
342 | 1682 // Don't expand unless it's significant |
1683 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
2188
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|
1684 if (expand(expand_bytes)) { |
c33825b68624
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|
1685 if (PrintGC && Verbose) { |
c33825b68624
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|
1686 gclog_or_tty->print_cr(" " |
c33825b68624
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|
1687 " expanding:" |
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|
1688 " max_heap_size: %6.1fK" |
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|
1689 " minimum_desired_capacity: %6.1fK" |
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|
1690 " expand_bytes: %6.1fK", |
c33825b68624
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|
1691 (double) max_heap_size / (double) K, |
c33825b68624
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|
1692 (double) minimum_desired_capacity / (double) K, |
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|
1693 (double) expand_bytes / (double) K); |
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|
1694 } |
342 | 1695 } |
1696 | |
1697 // No expansion, now see if we want to shrink | |
1717
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|
1698 } else if (capacity_after_gc > maximum_desired_capacity) { |
342 | 1699 // Capacity too large, compute shrinking size |
1700 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
1701 shrink(shrink_bytes); | |
1702 if (PrintGC && Verbose) { | |
1703 gclog_or_tty->print_cr(" " | |
1704 " shrinking:" | |
1717
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1705 " min_heap_size: %6.1fK" |
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1706 " maximum_desired_capacity: %6.1fK" |
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1707 " shrink_bytes: %6.1fK", |
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1708 (double) min_heap_size / (double) K, |
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1709 (double) maximum_desired_capacity / (double) K, |
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1710 (double) shrink_bytes / (double) K); |
342 | 1711 } |
1712 } | |
1713 } | |
1714 | |
1715 | |
1716 HeapWord* | |
1973 | 1717 G1CollectedHeap::satisfy_failed_allocation(size_t word_size, |
1718 bool* succeeded) { | |
2152 | 1719 assert_at_safepoint(true /* should_be_vm_thread */); |
1973 | 1720 |
1721 *succeeded = true; | |
1722 // Let's attempt the allocation first. | |
1723 HeapWord* result = attempt_allocation_at_safepoint(word_size, | |
1724 false /* expect_null_cur_alloc_region */); | |
1725 if (result != NULL) { | |
1726 assert(*succeeded, "sanity"); | |
1727 return result; | |
1728 } | |
342 | 1729 |
1730 // In a G1 heap, we're supposed to keep allocation from failing by | |
1731 // incremental pauses. Therefore, at least for now, we'll favor | |
1732 // expansion over collection. (This might change in the future if we can | |
1733 // do something smarter than full collection to satisfy a failed alloc.) | |
1734 result = expand_and_allocate(word_size); | |
1735 if (result != NULL) { | |
1973 | 1736 assert(*succeeded, "sanity"); |
342 | 1737 return result; |
1738 } | |
1739 | |
1973 | 1740 // Expansion didn't work, we'll try to do a Full GC. |
1741 bool gc_succeeded = do_collection(false, /* explicit_gc */ | |
1742 false, /* clear_all_soft_refs */ | |
1743 word_size); | |
1744 if (!gc_succeeded) { | |
1745 *succeeded = false; | |
1746 return NULL; | |
1747 } | |
1748 | |
1749 // Retry the allocation | |
1750 result = attempt_allocation_at_safepoint(word_size, | |
1751 true /* expect_null_cur_alloc_region */); | |
342 | 1752 if (result != NULL) { |
1973 | 1753 assert(*succeeded, "sanity"); |
342 | 1754 return result; |
1755 } | |
1756 | |
1973 | 1757 // Then, try a Full GC that will collect all soft references. |
1758 gc_succeeded = do_collection(false, /* explicit_gc */ | |
1759 true, /* clear_all_soft_refs */ | |
1760 word_size); | |
1761 if (!gc_succeeded) { | |
1762 *succeeded = false; | |
1763 return NULL; | |
1764 } | |
1765 | |
1766 // Retry the allocation once more | |
1767 result = attempt_allocation_at_safepoint(word_size, | |
1768 true /* expect_null_cur_alloc_region */); | |
342 | 1769 if (result != NULL) { |
1973 | 1770 assert(*succeeded, "sanity"); |
342 | 1771 return result; |
1772 } | |
1773 | |
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1774 assert(!collector_policy()->should_clear_all_soft_refs(), |
1973 | 1775 "Flag should have been handled and cleared prior to this point"); |
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1776 |
342 | 1777 // What else? We might try synchronous finalization later. If the total |
1778 // space available is large enough for the allocation, then a more | |
1779 // complete compaction phase than we've tried so far might be | |
1780 // appropriate. | |
1973 | 1781 assert(*succeeded, "sanity"); |
342 | 1782 return NULL; |
1783 } | |
1784 | |
1785 // Attempting to expand the heap sufficiently | |
1786 // to support an allocation of the given "word_size". If | |
1787 // successful, perform the allocation and return the address of the | |
1788 // allocated block, or else "NULL". | |
1789 | |
1790 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
2152 | 1791 assert_at_safepoint(true /* should_be_vm_thread */); |
1792 | |
1793 verify_region_sets_optional(); | |
1973 | 1794 |
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1795 size_t expand_bytes = MAX2(word_size * HeapWordSize, MinHeapDeltaBytes); |
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1796 if (expand(expand_bytes)) { |
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1797 verify_region_sets_optional(); |
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1798 return attempt_allocation_at_safepoint(word_size, |
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1799 false /* expect_null_cur_alloc_region */); |
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1800 } |
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1801 return NULL; |
342 | 1802 } |
1803 | |
2188
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1804 bool G1CollectedHeap::expand(size_t expand_bytes) { |
342 | 1805 size_t old_mem_size = _g1_storage.committed_size(); |
2188
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1806 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
342 | 1807 aligned_expand_bytes = align_size_up(aligned_expand_bytes, |
1808 HeapRegion::GrainBytes); | |
2188
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1809 |
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1810 if (Verbose && PrintGC) { |
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1811 gclog_or_tty->print("Expanding garbage-first heap from %ldK by %ldK", |
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1812 old_mem_size/K, aligned_expand_bytes/K); |
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1813 } |
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1814 |
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1815 HeapWord* old_end = (HeapWord*)_g1_storage.high(); |
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1816 bool successful = _g1_storage.expand_by(aligned_expand_bytes); |
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1817 if (successful) { |
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1818 HeapWord* new_end = (HeapWord*)_g1_storage.high(); |
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1819 |
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1820 // Expand the committed region. |
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1821 _g1_committed.set_end(new_end); |
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1822 |
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1823 // Tell the cardtable about the expansion. |
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1824 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); |
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1825 |
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1826 // And the offset table as well. |
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1827 _bot_shared->resize(_g1_committed.word_size()); |
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1828 |
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1829 expand_bytes = aligned_expand_bytes; |
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1830 HeapWord* base = old_end; |
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1831 |
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1832 // Create the heap regions for [old_end, new_end) |
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1833 while (expand_bytes > 0) { |
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1834 HeapWord* high = base + HeapRegion::GrainWords; |
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1835 |
342 | 1836 // Create a new HeapRegion. |
1837 MemRegion mr(base, high); | |
1838 bool is_zeroed = !_g1_max_committed.contains(base); | |
1839 HeapRegion* hr = new HeapRegion(_bot_shared, mr, is_zeroed); | |
1840 | |
1841 // Add it to the HeapRegionSeq. | |
1842 _hrs->insert(hr); | |
2152 | 1843 _free_list.add_as_tail(hr); |
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1844 |
342 | 1845 // And we used up an expansion region to create it. |
1846 _expansion_regions--; | |
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1847 |
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1848 expand_bytes -= HeapRegion::GrainBytes; |
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1849 base += HeapRegion::GrainWords; |
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1850 } |
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1851 assert(base == new_end, "sanity"); |
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1852 |
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1853 // Now update max_committed if necessary. |
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1854 _g1_max_committed.set_end(MAX2(_g1_max_committed.end(), new_end)); |
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1855 |
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1856 } else { |
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1857 // The expansion of the virtual storage space was unsuccessful. |
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1858 // Let's see if it was because we ran out of swap. |
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1859 if (G1ExitOnExpansionFailure && |
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1860 _g1_storage.uncommitted_size() >= aligned_expand_bytes) { |
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1861 // We had head room... |
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1862 vm_exit_out_of_memory(aligned_expand_bytes, "G1 heap expansion"); |
342 | 1863 } |
1864 } | |
2152 | 1865 |
342 | 1866 if (Verbose && PrintGC) { |
1867 size_t new_mem_size = _g1_storage.committed_size(); | |
2188
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1868 gclog_or_tty->print_cr("...%s, expanded to %ldK", |
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1869 (successful ? "Successful" : "Failed"), |
342 | 1870 new_mem_size/K); |
1871 } | |
2188
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1872 return successful; |
342 | 1873 } |
1874 | |
1875 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) | |
1876 { | |
1877 size_t old_mem_size = _g1_storage.committed_size(); | |
1878 size_t aligned_shrink_bytes = | |
1879 ReservedSpace::page_align_size_down(shrink_bytes); | |
1880 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
1881 HeapRegion::GrainBytes); | |
1882 size_t num_regions_deleted = 0; | |
1883 MemRegion mr = _hrs->shrink_by(aligned_shrink_bytes, num_regions_deleted); | |
1884 | |
1885 assert(mr.end() == (HeapWord*)_g1_storage.high(), "Bad shrink!"); | |
1886 if (mr.byte_size() > 0) | |
1887 _g1_storage.shrink_by(mr.byte_size()); | |
1888 assert(mr.start() == (HeapWord*)_g1_storage.high(), "Bad shrink!"); | |
1889 | |
1890 _g1_committed.set_end(mr.start()); | |
1891 _expansion_regions += num_regions_deleted; | |
1892 | |
1893 // Tell the cardtable about it. | |
1894 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
1895 | |
1896 // And the offset table as well. | |
1897 _bot_shared->resize(_g1_committed.word_size()); | |
1898 | |
1899 HeapRegionRemSet::shrink_heap(n_regions()); | |
1900 | |
1901 if (Verbose && PrintGC) { | |
1902 size_t new_mem_size = _g1_storage.committed_size(); | |
1903 gclog_or_tty->print_cr("Shrinking garbage-first heap from %ldK by %ldK to %ldK", | |
1904 old_mem_size/K, aligned_shrink_bytes/K, | |
1905 new_mem_size/K); | |
1906 } | |
1907 } | |
1908 | |
1909 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
2152 | 1910 verify_region_sets_optional(); |
1911 | |
636 | 1912 release_gc_alloc_regions(true /* totally */); |
2152 | 1913 // Instead of tearing down / rebuilding the free lists here, we |
1914 // could instead use the remove_all_pending() method on free_list to | |
1915 // remove only the ones that we need to remove. | |
342 | 1916 tear_down_region_lists(); // We will rebuild them in a moment. |
1917 shrink_helper(shrink_bytes); | |
1918 rebuild_region_lists(); | |
2152 | 1919 |
1920 verify_region_sets_optional(); | |
342 | 1921 } |
1922 | |
1923 // Public methods. | |
1924 | |
1925 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
1926 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
1927 #endif // _MSC_VER | |
1928 | |
1929 | |
1930 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
1931 SharedHeap(policy_), | |
1932 _g1_policy(policy_), | |
1111 | 1933 _dirty_card_queue_set(false), |
1705 | 1934 _into_cset_dirty_card_queue_set(false), |
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1935 _is_alive_closure(this), |
342 | 1936 _ref_processor(NULL), |
1937 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), | |
1938 _bot_shared(NULL), | |
1939 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
1940 _evac_failure_scan_stack(NULL) , | |
1941 _mark_in_progress(false), | |
2152 | 1942 _cg1r(NULL), _summary_bytes_used(0), |
342 | 1943 _cur_alloc_region(NULL), |
1944 _refine_cte_cl(NULL), | |
1945 _full_collection(false), | |
2152 | 1946 _free_list("Master Free List"), |
1947 _secondary_free_list("Secondary Free List"), | |
1948 _humongous_set("Master Humongous Set"), | |
1949 _free_regions_coming(false), | |
342 | 1950 _young_list(new YoungList(this)), |
1951 _gc_time_stamp(0), | |
526 | 1952 _surviving_young_words(NULL), |
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1953 _full_collections_completed(0), |
526 | 1954 _in_cset_fast_test(NULL), |
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1955 _in_cset_fast_test_base(NULL), |
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1956 _dirty_cards_region_list(NULL) { |
342 | 1957 _g1h = this; // To catch bugs. |
1958 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
1959 vm_exit_during_initialization("Failed necessary allocation."); | |
1960 } | |
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1961 |
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1962 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1963 |
342 | 1964 int n_queues = MAX2((int)ParallelGCThreads, 1); |
1965 _task_queues = new RefToScanQueueSet(n_queues); | |
1966 | |
1967 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
1968 assert(n_rem_sets > 0, "Invariant."); | |
1969 | |
1970 HeapRegionRemSetIterator** iter_arr = | |
1971 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
1972 for (int i = 0; i < n_queues; i++) { | |
1973 iter_arr[i] = new HeapRegionRemSetIterator(); | |
1974 } | |
1975 _rem_set_iterator = iter_arr; | |
1976 | |
1977 for (int i = 0; i < n_queues; i++) { | |
1978 RefToScanQueue* q = new RefToScanQueue(); | |
1979 q->initialize(); | |
1980 _task_queues->register_queue(i, q); | |
1981 } | |
1982 | |
1983 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
636 | 1984 _gc_alloc_regions[ap] = NULL; |
1985 _gc_alloc_region_counts[ap] = 0; | |
1986 _retained_gc_alloc_regions[ap] = NULL; | |
1987 // by default, we do not retain a GC alloc region for each ap; | |
1988 // we'll override this, when appropriate, below | |
1989 _retain_gc_alloc_region[ap] = false; | |
1990 } | |
1991 | |
1992 // We will try to remember the last half-full tenured region we | |
1993 // allocated to at the end of a collection so that we can re-use it | |
1994 // during the next collection. | |
1995 _retain_gc_alloc_region[GCAllocForTenured] = true; | |
1996 | |
342 | 1997 guarantee(_task_queues != NULL, "task_queues allocation failure."); |
1998 } | |
1999 | |
2000 jint G1CollectedHeap::initialize() { | |
1166 | 2001 CollectedHeap::pre_initialize(); |
342 | 2002 os::enable_vtime(); |
2003 | |
2004 // Necessary to satisfy locking discipline assertions. | |
2005 | |
2006 MutexLocker x(Heap_lock); | |
2007 | |
2008 // While there are no constraints in the GC code that HeapWordSize | |
2009 // be any particular value, there are multiple other areas in the | |
2010 // system which believe this to be true (e.g. oop->object_size in some | |
2011 // cases incorrectly returns the size in wordSize units rather than | |
2012 // HeapWordSize). | |
2013 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
2014 | |
2015 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
2016 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
2017 | |
2018 // Ensure that the sizes are properly aligned. | |
2019 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
2020 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
2021 | |
2022 _cg1r = new ConcurrentG1Refine(); | |
2023 | |
2024 // Reserve the maximum. | |
2025 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
2026 // Includes the perm-gen. | |
642
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2027 |
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2028 const size_t total_reserved = max_byte_size + pgs->max_size(); |
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2029 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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2030 |
342 | 2031 ReservedSpace heap_rs(max_byte_size + pgs->max_size(), |
2032 HeapRegion::GrainBytes, | |
2135
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2033 UseLargePages, addr); |
642
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2034 |
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2035 if (UseCompressedOops) { |
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2036 if (addr != NULL && !heap_rs.is_reserved()) { |
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2037 // Failed to reserve at specified address - the requested memory |
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2038 // region is taken already, for example, by 'java' launcher. |
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2039 // Try again to reserver heap higher. |
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2040 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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2041 ReservedSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
2135
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2042 UseLargePages, addr); |
642
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2043 if (addr != NULL && !heap_rs0.is_reserved()) { |
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2044 // Failed to reserve at specified address again - give up. |
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2045 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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2046 assert(addr == NULL, ""); |
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2047 ReservedSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
2135
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2048 UseLargePages, addr); |
642
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2049 heap_rs = heap_rs1; |
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2050 } else { |
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2051 heap_rs = heap_rs0; |
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2052 } |
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2053 } |
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2054 } |
342 | 2055 |
2056 if (!heap_rs.is_reserved()) { | |
2057 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
2058 return JNI_ENOMEM; | |
2059 } | |
2060 | |
2061 // It is important to do this in a way such that concurrent readers can't | |
2062 // temporarily think somethings in the heap. (I've actually seen this | |
2063 // happen in asserts: DLD.) | |
2064 _reserved.set_word_size(0); | |
2065 _reserved.set_start((HeapWord*)heap_rs.base()); | |
2066 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
2067 | |
2068 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
2069 | |
2070 // Create the gen rem set (and barrier set) for the entire reserved region. | |
2071 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
2072 set_barrier_set(rem_set()->bs()); | |
2073 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
2074 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
2075 } else { | |
2076 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
2077 return JNI_ENOMEM; | |
2078 } | |
2079 | |
2080 // Also create a G1 rem set. | |
1861 | 2081 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { |
2082 _g1_rem_set = new G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
342 | 2083 } else { |
1861 | 2084 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); |
2085 return JNI_ENOMEM; | |
342 | 2086 } |
2087 | |
2088 // Carve out the G1 part of the heap. | |
2089 | |
2090 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
2091 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
2092 g1_rs.size()/HeapWordSize); | |
2093 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
2094 | |
2095 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
2096 | |
2097 _g1_storage.initialize(g1_rs, 0); | |
2098 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
2099 _g1_max_committed = _g1_committed; | |
393 | 2100 _hrs = new HeapRegionSeq(_expansion_regions); |
342 | 2101 guarantee(_hrs != NULL, "Couldn't allocate HeapRegionSeq"); |
2102 guarantee(_cur_alloc_region == NULL, "from constructor"); | |
2103 | |
807
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2104 // 6843694 - ensure that the maximum region index can fit |
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2105 // in the remembered set structures. |
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2106 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
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2107 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
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2108 |
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2109 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
942
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|
2110 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
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2111 guarantee((size_t) HeapRegion::CardsPerRegion < max_cards_per_region, |
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|
2112 "too many cards per region"); |
807
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2113 |
2152 | 2114 HeapRegionSet::set_unrealistically_long_length(max_regions() + 1); |
2115 | |
342 | 2116 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
2117 heap_word_size(init_byte_size)); | |
2118 | |
2119 _g1h = this; | |
2120 | |
1394
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2121 _in_cset_fast_test_length = max_regions(); |
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2122 _in_cset_fast_test_base = NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); |
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2123 |
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|
2124 // We're biasing _in_cset_fast_test to avoid subtracting the |
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|
2125 // beginning of the heap every time we want to index; basically |
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|
2126 // it's the same with what we do with the card table. |
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2127 _in_cset_fast_test = _in_cset_fast_test_base - |
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2128 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
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|
2129 |
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|
2130 // Clear the _cset_fast_test bitmap in anticipation of adding |
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2131 // regions to the incremental collection set for the first |
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|
2132 // evacuation pause. |
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|
2133 clear_cset_fast_test(); |
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|
2134 |
342 | 2135 // Create the ConcurrentMark data structure and thread. |
2136 // (Must do this late, so that "max_regions" is defined.) | |
2137 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
2138 _cmThread = _cm->cmThread(); | |
2139 | |
2140 // Initialize the from_card cache structure of HeapRegionRemSet. | |
2141 HeapRegionRemSet::init_heap(max_regions()); | |
2142 | |
677 | 2143 // Now expand into the initial heap size. |
2188
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6923430: G1: assert(res != 0,"This should have worked.")
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|
2144 if (!expand(init_byte_size)) { |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
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|
2145 vm_exit_during_initialization("Failed to allocate initial heap."); |
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6923430: G1: assert(res != 0,"This should have worked.")
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diff
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|
2146 return JNI_ENOMEM; |
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|
2147 } |
342 | 2148 |
2149 // Perform any initialization actions delegated to the policy. | |
2150 g1_policy()->init(); | |
2151 | |
2152 g1_policy()->note_start_of_mark_thread(); | |
2153 | |
2154 _refine_cte_cl = | |
2155 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
2156 g1_rem_set(), | |
2157 concurrent_g1_refine()); | |
2158 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
2159 | |
2160 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
2161 SATB_Q_FL_lock, | |
1111 | 2162 G1SATBProcessCompletedThreshold, |
342 | 2163 Shared_SATB_Q_lock); |
794 | 2164 |
2165 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
2166 DirtyCardQ_FL_lock, | |
1111 | 2167 concurrent_g1_refine()->yellow_zone(), |
2168 concurrent_g1_refine()->red_zone(), | |
794 | 2169 Shared_DirtyCardQ_lock); |
2170 | |
616
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|
2171 if (G1DeferredRSUpdate) { |
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|
2172 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
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|
2173 DirtyCardQ_FL_lock, |
1111 | 2174 -1, // never trigger processing |
2175 -1, // no limit on length | |
616
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|
2176 Shared_DirtyCardQ_lock, |
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|
2177 &JavaThread::dirty_card_queue_set()); |
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|
2178 } |
1705 | 2179 |
2180 // Initialize the card queue set used to hold cards containing | |
2181 // references into the collection set. | |
2182 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
2183 DirtyCardQ_FL_lock, | |
2184 -1, // never trigger processing | |
2185 -1, // no limit on length | |
2186 Shared_DirtyCardQ_lock, | |
2187 &JavaThread::dirty_card_queue_set()); | |
2188 | |
342 | 2189 // In case we're keeping closure specialization stats, initialize those |
2190 // counts and that mechanism. | |
2191 SpecializationStats::clear(); | |
2192 | |
2193 _gc_alloc_region_list = NULL; | |
2194 | |
2195 // Do later initialization work for concurrent refinement. | |
2196 _cg1r->init(); | |
2197 | |
2198 return JNI_OK; | |
2199 } | |
2200 | |
2201 void G1CollectedHeap::ref_processing_init() { | |
1974
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2202 // Reference processing in G1 currently works as follows: |
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2203 // |
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|
2204 // * There is only one reference processor instance that |
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|
2205 // 'spans' the entire heap. It is created by the code |
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2206 // below. |
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|
2207 // * Reference discovery is not enabled during an incremental |
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|
2208 // pause (see 6484982). |
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|
2209 // * Discoverered refs are not enqueued nor are they processed |
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2210 // during an incremental pause (see 6484982). |
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2211 // * Reference discovery is enabled at initial marking. |
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2212 // * Reference discovery is disabled and the discovered |
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2213 // references processed etc during remarking. |
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|
2214 // * Reference discovery is MT (see below). |
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2215 // * Reference discovery requires a barrier (see below). |
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|
2216 // * Reference processing is currently not MT (see 6608385). |
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|
2217 // * A full GC enables (non-MT) reference discovery and |
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|
2218 // processes any discovered references. |
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|
2219 |
342 | 2220 SharedHeap::ref_processing_init(); |
2221 MemRegion mr = reserved_region(); | |
2222 _ref_processor = ReferenceProcessor::create_ref_processor( | |
2223 mr, // span | |
2224 false, // Reference discovery is not atomic | |
2225 true, // mt_discovery | |
2037
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
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2030
diff
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|
2226 &_is_alive_closure, // is alive closure |
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
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2030
diff
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|
2227 // for efficiency |
342 | 2228 ParallelGCThreads, |
2229 ParallelRefProcEnabled, | |
2230 true); // Setting next fields of discovered | |
2231 // lists requires a barrier. | |
2232 } | |
2233 | |
2234 size_t G1CollectedHeap::capacity() const { | |
2235 return _g1_committed.byte_size(); | |
2236 } | |
2237 | |
1705 | 2238 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
2239 DirtyCardQueue* into_cset_dcq, | |
2240 bool concurrent, | |
342 | 2241 int worker_i) { |
889 | 2242 // Clean cards in the hot card cache |
1705 | 2243 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set(), into_cset_dcq); |
889 | 2244 |
342 | 2245 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
2246 int n_completed_buffers = 0; | |
1705 | 2247 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
342 | 2248 n_completed_buffers++; |
2249 } | |
2250 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
2251 (double) n_completed_buffers); | |
2252 dcqs.clear_n_completed_buffers(); | |
2253 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
2254 } | |
2255 | |
2256 | |
2257 // Computes the sum of the storage used by the various regions. | |
2258 | |
2259 size_t G1CollectedHeap::used() const { | |
862
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2260 assert(Heap_lock->owner() != NULL, |
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2261 "Should be owned on this thread's behalf."); |
342 | 2262 size_t result = _summary_bytes_used; |
845
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2263 // Read only once in case it is set to NULL concurrently |
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2264 HeapRegion* hr = _cur_alloc_region; |
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2265 if (hr != NULL) |
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|
2266 result += hr->used(); |
342 | 2267 return result; |
2268 } | |
2269 | |
846
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2270 size_t G1CollectedHeap::used_unlocked() const { |
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2271 size_t result = _summary_bytes_used; |
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2272 return result; |
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|
2273 } |
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|
2274 |
342 | 2275 class SumUsedClosure: public HeapRegionClosure { |
2276 size_t _used; | |
2277 public: | |
2278 SumUsedClosure() : _used(0) {} | |
2279 bool doHeapRegion(HeapRegion* r) { | |
2280 if (!r->continuesHumongous()) { | |
2281 _used += r->used(); | |
2282 } | |
2283 return false; | |
2284 } | |
2285 size_t result() { return _used; } | |
2286 }; | |
2287 | |
2288 size_t G1CollectedHeap::recalculate_used() const { | |
2289 SumUsedClosure blk; | |
2290 _hrs->iterate(&blk); | |
2291 return blk.result(); | |
2292 } | |
2293 | |
2294 #ifndef PRODUCT | |
2295 class SumUsedRegionsClosure: public HeapRegionClosure { | |
2296 size_t _num; | |
2297 public: | |
677 | 2298 SumUsedRegionsClosure() : _num(0) {} |
342 | 2299 bool doHeapRegion(HeapRegion* r) { |
2300 if (r->continuesHumongous() || r->used() > 0 || r->is_gc_alloc_region()) { | |
2301 _num += 1; | |
2302 } | |
2303 return false; | |
2304 } | |
2305 size_t result() { return _num; } | |
2306 }; | |
2307 | |
2308 size_t G1CollectedHeap::recalculate_used_regions() const { | |
2309 SumUsedRegionsClosure blk; | |
2310 _hrs->iterate(&blk); | |
2311 return blk.result(); | |
2312 } | |
2313 #endif // PRODUCT | |
2314 | |
2315 size_t G1CollectedHeap::unsafe_max_alloc() { | |
2152 | 2316 if (free_regions() > 0) return HeapRegion::GrainBytes; |
342 | 2317 // otherwise, is there space in the current allocation region? |
2318 | |
2319 // We need to store the current allocation region in a local variable | |
2320 // here. The problem is that this method doesn't take any locks and | |
2321 // there may be other threads which overwrite the current allocation | |
2322 // region field. attempt_allocation(), for example, sets it to NULL | |
2323 // and this can happen *after* the NULL check here but before the call | |
2324 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
2325 // to be a problem in the optimized build, since the two loads of the | |
2326 // current allocation region field are optimized away. | |
2327 HeapRegion* car = _cur_alloc_region; | |
2328 | |
2329 // FIXME: should iterate over all regions? | |
2330 if (car == NULL) { | |
2331 return 0; | |
2332 } | |
2333 return car->free(); | |
2334 } | |
2335 | |
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2336 bool G1CollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { |
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|
2337 return |
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|
2338 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
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|
2339 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
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|
2340 } |
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|
2341 |
2030
fb712ff22571
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|
2342 void G1CollectedHeap::increment_full_collections_completed(bool concurrent) { |
1656
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|
2343 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
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2344 |
2030
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|
2345 // We assume that if concurrent == true, then the caller is a |
fb712ff22571
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|
2346 // concurrent thread that was joined the Suspendible Thread |
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|
2347 // Set. If there's ever a cheap way to check this, we should add an |
fb712ff22571
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|
2348 // assert here. |
fb712ff22571
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|
2349 |
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|
2350 // We have already incremented _total_full_collections at the start |
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|
2351 // of the GC, so total_full_collections() represents how many full |
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|
2352 // collections have been started. |
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|
2353 unsigned int full_collections_started = total_full_collections(); |
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|
2354 |
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|
2355 // Given that this method is called at the end of a Full GC or of a |
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|
2356 // concurrent cycle, and those can be nested (i.e., a Full GC can |
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|
2357 // interrupt a concurrent cycle), the number of full collections |
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|
2358 // completed should be either one (in the case where there was no |
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|
2359 // nesting) or two (when a Full GC interrupted a concurrent cycle) |
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|
2360 // behind the number of full collections started. |
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|
2361 |
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|
2362 // This is the case for the inner caller, i.e. a Full GC. |
2030
fb712ff22571
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|
2363 assert(concurrent || |
1656
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|
2364 (full_collections_started == _full_collections_completed + 1) || |
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|
2365 (full_collections_started == _full_collections_completed + 2), |
2030
fb712ff22571
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|
2366 err_msg("for inner caller (Full GC): full_collections_started = %u " |
1656
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|
2367 "is inconsistent with _full_collections_completed = %u", |
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|
2368 full_collections_started, _full_collections_completed)); |
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6944166: G1: explicit GCs are not always handled correctly
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|
2369 |
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diff
changeset
|
2370 // This is the case for the outer caller, i.e. the concurrent cycle. |
2030
fb712ff22571
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diff
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|
2371 assert(!concurrent || |
1656
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6944166: G1: explicit GCs are not always handled correctly
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|
2372 (full_collections_started == _full_collections_completed + 1), |
2030
fb712ff22571
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diff
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|
2373 err_msg("for outer caller (concurrent cycle): " |
fb712ff22571
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|
2374 "full_collections_started = %u " |
1656
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|
2375 "is inconsistent with _full_collections_completed = %u", |
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|
2376 full_collections_started, _full_collections_completed)); |
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6944166: G1: explicit GCs are not always handled correctly
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|
2377 |
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6944166: G1: explicit GCs are not always handled correctly
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diff
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|
2378 _full_collections_completed += 1; |
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|
2379 |
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
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1833
diff
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|
2380 // We need to clear the "in_progress" flag in the CM thread before |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
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diff
changeset
|
2381 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
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1833
diff
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|
2382 // is set) so that if a waiter requests another System.gc() it doesn't |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
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1833
diff
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|
2383 // incorrectly see that a marking cyle is still in progress. |
2030
fb712ff22571
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|
2384 if (concurrent) { |
1840
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1833
diff
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|
2385 _cmThread->clear_in_progress(); |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
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1833
diff
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|
2386 } |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
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diff
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|
2387 |
1656
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6944166: G1: explicit GCs are not always handled correctly
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|
2388 // This notify_all() will ensure that a thread that called |
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|
2389 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
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|
2390 // and it's waiting for a full GC to finish will be woken up. It is |
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|
2391 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
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|
2392 FullGCCount_lock->notify_all(); |
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|
2393 } |
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|
2394 |
342 | 2395 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
2152 | 2396 assert_at_safepoint(true /* should_be_vm_thread */); |
342 | 2397 GCCauseSetter gcs(this, cause); |
2398 switch (cause) { | |
2399 case GCCause::_heap_inspection: | |
2400 case GCCause::_heap_dump: { | |
2401 HandleMark hm; | |
2402 do_full_collection(false); // don't clear all soft refs | |
2403 break; | |
2404 } | |
2405 default: // XXX FIX ME | |
2406 ShouldNotReachHere(); // Unexpected use of this function | |
2407 } | |
2408 } | |
2409 | |
1088
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|
2410 void G1CollectedHeap::collect(GCCause::Cause cause) { |
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|
2411 // The caller doesn't have the Heap_lock |
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|
2412 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
3fc996d4edd2
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|
2413 |
1656
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|
2414 unsigned int gc_count_before; |
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|
2415 unsigned int full_gc_count_before; |
342 | 2416 { |
1088
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|
2417 MutexLocker ml(Heap_lock); |
1973 | 2418 |
1088
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|
2419 // Read the GC count while holding the Heap_lock |
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|
2420 gc_count_before = SharedHeap::heap()->total_collections(); |
1656
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|
2421 full_gc_count_before = SharedHeap::heap()->total_full_collections(); |
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|
2422 } |
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|
2423 |
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|
2424 if (should_do_concurrent_full_gc(cause)) { |
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|
2425 // Schedule an initial-mark evacuation pause that will start a |
1973 | 2426 // concurrent cycle. We're setting word_size to 0 which means that |
2427 // we are not requesting a post-GC allocation. | |
1656
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|
2428 VM_G1IncCollectionPause op(gc_count_before, |
1973 | 2429 0, /* word_size */ |
2430 true, /* should_initiate_conc_mark */ | |
1656
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|
2431 g1_policy()->max_pause_time_ms(), |
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diff
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|
2432 cause); |
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diff
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|
2433 VMThread::execute(&op); |
4e5661ba9d98
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|
2434 } else { |
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|
2435 if (cause == GCCause::_gc_locker |
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|
2436 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
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|
2437 |
1973 | 2438 // Schedule a standard evacuation pause. We're setting word_size |
2439 // to 0 which means that we are not requesting a post-GC allocation. | |
1656
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|
2440 VM_G1IncCollectionPause op(gc_count_before, |
1973 | 2441 0, /* word_size */ |
1656
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2442 false, /* should_initiate_conc_mark */ |
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2443 g1_policy()->max_pause_time_ms(), |
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2444 cause); |
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2445 VMThread::execute(&op); |
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2446 } else { |
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2447 // Schedule a Full GC. |
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2448 VM_G1CollectFull op(gc_count_before, full_gc_count_before, cause); |
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2449 VMThread::execute(&op); |
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2450 } |
342 | 2451 } |
2452 } | |
2453 | |
2454 bool G1CollectedHeap::is_in(const void* p) const { | |
2455 if (_g1_committed.contains(p)) { | |
2456 HeapRegion* hr = _hrs->addr_to_region(p); | |
2457 return hr->is_in(p); | |
2458 } else { | |
2459 return _perm_gen->as_gen()->is_in(p); | |
2460 } | |
2461 } | |
2462 | |
2463 // Iteration functions. | |
2464 | |
2465 // Iterates an OopClosure over all ref-containing fields of objects | |
2466 // within a HeapRegion. | |
2467 | |
2468 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
2469 MemRegion _mr; | |
2470 OopClosure* _cl; | |
2471 public: | |
2472 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
2473 : _mr(mr), _cl(cl) {} | |
2474 bool doHeapRegion(HeapRegion* r) { | |
2475 if (! r->continuesHumongous()) { | |
2476 r->oop_iterate(_cl); | |
2477 } | |
2478 return false; | |
2479 } | |
2480 }; | |
2481 | |
678 | 2482 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
342 | 2483 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
2484 _hrs->iterate(&blk); | |
678 | 2485 if (do_perm) { |
2486 perm_gen()->oop_iterate(cl); | |
2487 } | |
342 | 2488 } |
2489 | |
678 | 2490 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
342 | 2491 IterateOopClosureRegionClosure blk(mr, cl); |
2492 _hrs->iterate(&blk); | |
678 | 2493 if (do_perm) { |
2494 perm_gen()->oop_iterate(cl); | |
2495 } | |
342 | 2496 } |
2497 | |
2498 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
2499 | |
2500 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
2501 ObjectClosure* _cl; | |
2502 public: | |
2503 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
2504 bool doHeapRegion(HeapRegion* r) { | |
2505 if (! r->continuesHumongous()) { | |
2506 r->object_iterate(_cl); | |
2507 } | |
2508 return false; | |
2509 } | |
2510 }; | |
2511 | |
678 | 2512 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
342 | 2513 IterateObjectClosureRegionClosure blk(cl); |
2514 _hrs->iterate(&blk); | |
678 | 2515 if (do_perm) { |
2516 perm_gen()->object_iterate(cl); | |
2517 } | |
342 | 2518 } |
2519 | |
2520 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
2521 // FIXME: is this right? | |
2522 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
2523 } | |
2524 | |
2525 // Calls a SpaceClosure on a HeapRegion. | |
2526 | |
2527 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
2528 SpaceClosure* _cl; | |
2529 public: | |
2530 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
2531 bool doHeapRegion(HeapRegion* r) { | |
2532 _cl->do_space(r); | |
2533 return false; | |
2534 } | |
2535 }; | |
2536 | |
2537 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
2538 SpaceClosureRegionClosure blk(cl); | |
2539 _hrs->iterate(&blk); | |
2540 } | |
2541 | |
2542 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) { | |
2543 _hrs->iterate(cl); | |
2544 } | |
2545 | |
2546 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
2547 HeapRegionClosure* cl) { | |
2548 _hrs->iterate_from(r, cl); | |
2549 } | |
2550 | |
2551 void | |
2552 G1CollectedHeap::heap_region_iterate_from(int idx, HeapRegionClosure* cl) { | |
2553 _hrs->iterate_from(idx, cl); | |
2554 } | |
2555 | |
2556 HeapRegion* G1CollectedHeap::region_at(size_t idx) { return _hrs->at(idx); } | |
2557 | |
2558 void | |
2559 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
2560 int worker, | |
2561 jint claim_value) { | |
355 | 2562 const size_t regions = n_regions(); |
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2563 const size_t worker_num = (G1CollectedHeap::use_parallel_gc_threads() ? ParallelGCThreads : 1); |
355 | 2564 // try to spread out the starting points of the workers |
2565 const size_t start_index = regions / worker_num * (size_t) worker; | |
2566 | |
2567 // each worker will actually look at all regions | |
2568 for (size_t count = 0; count < regions; ++count) { | |
2569 const size_t index = (start_index + count) % regions; | |
2570 assert(0 <= index && index < regions, "sanity"); | |
2571 HeapRegion* r = region_at(index); | |
2572 // we'll ignore "continues humongous" regions (we'll process them | |
2573 // when we come across their corresponding "start humongous" | |
2574 // region) and regions already claimed | |
2575 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
2576 continue; | |
2577 } | |
2578 // OK, try to claim it | |
342 | 2579 if (r->claimHeapRegion(claim_value)) { |
355 | 2580 // success! |
2581 assert(!r->continuesHumongous(), "sanity"); | |
2582 if (r->startsHumongous()) { | |
2583 // If the region is "starts humongous" we'll iterate over its | |
2584 // "continues humongous" first; in fact we'll do them | |
2585 // first. The order is important. In on case, calling the | |
2586 // closure on the "starts humongous" region might de-allocate | |
2587 // and clear all its "continues humongous" regions and, as a | |
2588 // result, we might end up processing them twice. So, we'll do | |
2589 // them first (notice: most closures will ignore them anyway) and | |
2590 // then we'll do the "starts humongous" region. | |
2591 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
2592 HeapRegion* chr = region_at(ch_index); | |
2593 | |
2594 // if the region has already been claimed or it's not | |
2595 // "continues humongous" we're done | |
2596 if (chr->claim_value() == claim_value || | |
2597 !chr->continuesHumongous()) { | |
2598 break; | |
2599 } | |
2600 | |
2601 // Noone should have claimed it directly. We can given | |
2602 // that we claimed its "starts humongous" region. | |
2603 assert(chr->claim_value() != claim_value, "sanity"); | |
2604 assert(chr->humongous_start_region() == r, "sanity"); | |
2605 | |
2606 if (chr->claimHeapRegion(claim_value)) { | |
2607 // we should always be able to claim it; noone else should | |
2608 // be trying to claim this region | |
2609 | |
2610 bool res2 = cl->doHeapRegion(chr); | |
2611 assert(!res2, "Should not abort"); | |
2612 | |
2613 // Right now, this holds (i.e., no closure that actually | |
2614 // does something with "continues humongous" regions | |
2615 // clears them). We might have to weaken it in the future, | |
2616 // but let's leave these two asserts here for extra safety. | |
2617 assert(chr->continuesHumongous(), "should still be the case"); | |
2618 assert(chr->humongous_start_region() == r, "sanity"); | |
2619 } else { | |
2620 guarantee(false, "we should not reach here"); | |
2621 } | |
2622 } | |
2623 } | |
2624 | |
2625 assert(!r->continuesHumongous(), "sanity"); | |
2626 bool res = cl->doHeapRegion(r); | |
2627 assert(!res, "Should not abort"); | |
2628 } | |
2629 } | |
2630 } | |
2631 | |
390 | 2632 class ResetClaimValuesClosure: public HeapRegionClosure { |
2633 public: | |
2634 bool doHeapRegion(HeapRegion* r) { | |
2635 r->set_claim_value(HeapRegion::InitialClaimValue); | |
2636 return false; | |
2637 } | |
2638 }; | |
2639 | |
2640 void | |
2641 G1CollectedHeap::reset_heap_region_claim_values() { | |
2642 ResetClaimValuesClosure blk; | |
2643 heap_region_iterate(&blk); | |
2644 } | |
2645 | |
355 | 2646 #ifdef ASSERT |
2647 // This checks whether all regions in the heap have the correct claim | |
2648 // value. I also piggy-backed on this a check to ensure that the | |
2649 // humongous_start_region() information on "continues humongous" | |
2650 // regions is correct. | |
2651 | |
2652 class CheckClaimValuesClosure : public HeapRegionClosure { | |
2653 private: | |
2654 jint _claim_value; | |
2655 size_t _failures; | |
2656 HeapRegion* _sh_region; | |
2657 public: | |
2658 CheckClaimValuesClosure(jint claim_value) : | |
2659 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
2660 bool doHeapRegion(HeapRegion* r) { | |
2661 if (r->claim_value() != _claim_value) { | |
2662 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
2663 "claim value = %d, should be %d", | |
2664 r->bottom(), r->end(), r->claim_value(), | |
2665 _claim_value); | |
2666 ++_failures; | |
2667 } | |
2668 if (!r->isHumongous()) { | |
2669 _sh_region = NULL; | |
2670 } else if (r->startsHumongous()) { | |
2671 _sh_region = r; | |
2672 } else if (r->continuesHumongous()) { | |
2673 if (r->humongous_start_region() != _sh_region) { | |
2674 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
2675 "HS = "PTR_FORMAT", should be "PTR_FORMAT, | |
2676 r->bottom(), r->end(), | |
2677 r->humongous_start_region(), | |
2678 _sh_region); | |
2679 ++_failures; | |
342 | 2680 } |
2681 } | |
355 | 2682 return false; |
2683 } | |
2684 size_t failures() { | |
2685 return _failures; | |
2686 } | |
2687 }; | |
2688 | |
2689 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
2690 CheckClaimValuesClosure cl(claim_value); | |
2691 heap_region_iterate(&cl); | |
2692 return cl.failures() == 0; | |
2693 } | |
2694 #endif // ASSERT | |
342 | 2695 |
2696 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { | |
2697 HeapRegion* r = g1_policy()->collection_set(); | |
2698 while (r != NULL) { | |
2699 HeapRegion* next = r->next_in_collection_set(); | |
2700 if (cl->doHeapRegion(r)) { | |
2701 cl->incomplete(); | |
2702 return; | |
2703 } | |
2704 r = next; | |
2705 } | |
2706 } | |
2707 | |
2708 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
2709 HeapRegionClosure *cl) { | |
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2710 if (r == NULL) { |
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2711 // The CSet is empty so there's nothing to do. |
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2712 return; |
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2713 } |
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2714 |
342 | 2715 assert(r->in_collection_set(), |
2716 "Start region must be a member of the collection set."); | |
2717 HeapRegion* cur = r; | |
2718 while (cur != NULL) { | |
2719 HeapRegion* next = cur->next_in_collection_set(); | |
2720 if (cl->doHeapRegion(cur) && false) { | |
2721 cl->incomplete(); | |
2722 return; | |
2723 } | |
2724 cur = next; | |
2725 } | |
2726 cur = g1_policy()->collection_set(); | |
2727 while (cur != r) { | |
2728 HeapRegion* next = cur->next_in_collection_set(); | |
2729 if (cl->doHeapRegion(cur) && false) { | |
2730 cl->incomplete(); | |
2731 return; | |
2732 } | |
2733 cur = next; | |
2734 } | |
2735 } | |
2736 | |
2737 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
2738 return _hrs->length() > 0 ? _hrs->at(0) : NULL; | |
2739 } | |
2740 | |
2741 | |
2742 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
2743 Space* res = heap_region_containing(addr); | |
2744 if (res == NULL) | |
2745 res = perm_gen()->space_containing(addr); | |
2746 return res; | |
2747 } | |
2748 | |
2749 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
2750 Space* sp = space_containing(addr); | |
2751 if (sp != NULL) { | |
2752 return sp->block_start(addr); | |
2753 } | |
2754 return NULL; | |
2755 } | |
2756 | |
2757 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
2758 Space* sp = space_containing(addr); | |
2759 assert(sp != NULL, "block_size of address outside of heap"); | |
2760 return sp->block_size(addr); | |
2761 } | |
2762 | |
2763 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
2764 Space* sp = space_containing(addr); | |
2765 return sp->block_is_obj(addr); | |
2766 } | |
2767 | |
2768 bool G1CollectedHeap::supports_tlab_allocation() const { | |
2769 return true; | |
2770 } | |
2771 | |
2772 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
2773 return HeapRegion::GrainBytes; | |
2774 } | |
2775 | |
2776 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
2777 // Return the remaining space in the cur alloc region, but not less than | |
2778 // the min TLAB size. | |
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2779 |
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2780 // Also, this value can be at most the humongous object threshold, |
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2781 // since we can't allow tlabs to grow big enough to accomodate |
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2782 // humongous objects. |
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2783 |
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2784 // We need to store the cur alloc region locally, since it might change |
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2785 // between when we test for NULL and when we use it later. |
342 | 2786 ContiguousSpace* cur_alloc_space = _cur_alloc_region; |
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2787 size_t max_tlab_size = _humongous_object_threshold_in_words * wordSize; |
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2788 |
342 | 2789 if (cur_alloc_space == NULL) { |
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2790 return max_tlab_size; |
342 | 2791 } else { |
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2792 return MIN2(MAX2(cur_alloc_space->free(), (size_t)MinTLABSize), |
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2793 max_tlab_size); |
342 | 2794 } |
2795 } | |
2796 | |
2797 size_t G1CollectedHeap::large_typearray_limit() { | |
2798 // FIXME | |
2799 return HeapRegion::GrainBytes/HeapWordSize; | |
2800 } | |
2801 | |
2802 size_t G1CollectedHeap::max_capacity() const { | |
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2803 return _g1_reserved.byte_size(); |
342 | 2804 } |
2805 | |
2806 jlong G1CollectedHeap::millis_since_last_gc() { | |
2807 // assert(false, "NYI"); | |
2808 return 0; | |
2809 } | |
2810 | |
2811 void G1CollectedHeap::prepare_for_verify() { | |
2812 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
2813 ensure_parsability(false); | |
2814 } | |
2815 g1_rem_set()->prepare_for_verify(); | |
2816 } | |
2817 | |
2818 class VerifyLivenessOopClosure: public OopClosure { | |
2819 G1CollectedHeap* g1h; | |
2820 public: | |
2821 VerifyLivenessOopClosure(G1CollectedHeap* _g1h) { | |
2822 g1h = _g1h; | |
2823 } | |
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2824 void do_oop(narrowOop *p) { do_oop_work(p); } |
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2825 void do_oop( oop *p) { do_oop_work(p); } |
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2826 |
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2827 template <class T> void do_oop_work(T *p) { |
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2828 oop obj = oopDesc::load_decode_heap_oop(p); |
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2829 guarantee(obj == NULL || !g1h->is_obj_dead(obj), |
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2830 "Dead object referenced by a not dead object"); |
342 | 2831 } |
2832 }; | |
2833 | |
2834 class VerifyObjsInRegionClosure: public ObjectClosure { | |
811 | 2835 private: |
342 | 2836 G1CollectedHeap* _g1h; |
2837 size_t _live_bytes; | |
2838 HeapRegion *_hr; | |
811 | 2839 bool _use_prev_marking; |
342 | 2840 public: |
811 | 2841 // use_prev_marking == true -> use "prev" marking information, |
2842 // use_prev_marking == false -> use "next" marking information | |
2843 VerifyObjsInRegionClosure(HeapRegion *hr, bool use_prev_marking) | |
2844 : _live_bytes(0), _hr(hr), _use_prev_marking(use_prev_marking) { | |
342 | 2845 _g1h = G1CollectedHeap::heap(); |
2846 } | |
2847 void do_object(oop o) { | |
2848 VerifyLivenessOopClosure isLive(_g1h); | |
2849 assert(o != NULL, "Huh?"); | |
811 | 2850 if (!_g1h->is_obj_dead_cond(o, _use_prev_marking)) { |
342 | 2851 o->oop_iterate(&isLive); |
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2852 if (!_hr->obj_allocated_since_prev_marking(o)) { |
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2853 size_t obj_size = o->size(); // Make sure we don't overflow |
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2854 _live_bytes += (obj_size * HeapWordSize); |
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2855 } |
342 | 2856 } |
2857 } | |
2858 size_t live_bytes() { return _live_bytes; } | |
2859 }; | |
2860 | |
2861 class PrintObjsInRegionClosure : public ObjectClosure { | |
2862 HeapRegion *_hr; | |
2863 G1CollectedHeap *_g1; | |
2864 public: | |
2865 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
2866 _g1 = G1CollectedHeap::heap(); | |
2867 }; | |
2868 | |
2869 void do_object(oop o) { | |
2870 if (o != NULL) { | |
2871 HeapWord *start = (HeapWord *) o; | |
2872 size_t word_sz = o->size(); | |
2873 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
2874 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
2875 (void*) o, word_sz, | |
2876 _g1->isMarkedPrev(o), | |
2877 _g1->isMarkedNext(o), | |
2878 _hr->obj_allocated_since_prev_marking(o)); | |
2879 HeapWord *end = start + word_sz; | |
2880 HeapWord *cur; | |
2881 int *val; | |
2882 for (cur = start; cur < end; cur++) { | |
2883 val = (int *) cur; | |
2884 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
2885 } | |
2886 } | |
2887 } | |
2888 }; | |
2889 | |
2890 class VerifyRegionClosure: public HeapRegionClosure { | |
811 | 2891 private: |
342 | 2892 bool _allow_dirty; |
390 | 2893 bool _par; |
811 | 2894 bool _use_prev_marking; |
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2895 bool _failures; |
811 | 2896 public: |
2897 // use_prev_marking == true -> use "prev" marking information, | |
2898 // use_prev_marking == false -> use "next" marking information | |
2899 VerifyRegionClosure(bool allow_dirty, bool par, bool use_prev_marking) | |
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2900 : _allow_dirty(allow_dirty), |
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2901 _par(par), |
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2902 _use_prev_marking(use_prev_marking), |
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2903 _failures(false) {} |
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2904 |
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2905 bool failures() { |
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2906 return _failures; |
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2907 } |
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2908 |
342 | 2909 bool doHeapRegion(HeapRegion* r) { |
390 | 2910 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
2911 "Should be unclaimed at verify points."); | |
637
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2912 if (!r->continuesHumongous()) { |
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2913 bool failures = false; |
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2914 r->verify(_allow_dirty, _use_prev_marking, &failures); |
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2915 if (failures) { |
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2916 _failures = true; |
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2917 } else { |
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2918 VerifyObjsInRegionClosure not_dead_yet_cl(r, _use_prev_marking); |
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2919 r->object_iterate(¬_dead_yet_cl); |
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2920 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
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2921 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
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2922 "max_live_bytes "SIZE_FORMAT" " |
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2923 "< calculated "SIZE_FORMAT, |
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2924 r->bottom(), r->end(), |
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2925 r->max_live_bytes(), |
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2926 not_dead_yet_cl.live_bytes()); |
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2927 _failures = true; |
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2928 } |
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2929 } |
342 | 2930 } |
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2931 return false; // stop the region iteration if we hit a failure |
342 | 2932 } |
2933 }; | |
2934 | |
2935 class VerifyRootsClosure: public OopsInGenClosure { | |
2936 private: | |
2937 G1CollectedHeap* _g1h; | |
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2938 bool _use_prev_marking; |
342 | 2939 bool _failures; |
2940 public: | |
811 | 2941 // use_prev_marking == true -> use "prev" marking information, |
2942 // use_prev_marking == false -> use "next" marking information | |
2943 VerifyRootsClosure(bool use_prev_marking) : | |
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2944 _g1h(G1CollectedHeap::heap()), |
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2945 _use_prev_marking(use_prev_marking), |
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2946 _failures(false) { } |
342 | 2947 |
2948 bool failures() { return _failures; } | |
2949 | |
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2950 template <class T> void do_oop_nv(T* p) { |
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2951 T heap_oop = oopDesc::load_heap_oop(p); |
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2952 if (!oopDesc::is_null(heap_oop)) { |
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2953 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
811 | 2954 if (_g1h->is_obj_dead_cond(obj, _use_prev_marking)) { |
342 | 2955 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
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2956 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
342 | 2957 obj->print_on(gclog_or_tty); |
2958 _failures = true; | |
2959 } | |
2960 } | |
2961 } | |
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2962 |
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2963 void do_oop(oop* p) { do_oop_nv(p); } |
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2964 void do_oop(narrowOop* p) { do_oop_nv(p); } |
342 | 2965 }; |
2966 | |
390 | 2967 // This is the task used for parallel heap verification. |
2968 | |
2969 class G1ParVerifyTask: public AbstractGangTask { | |
2970 private: | |
2971 G1CollectedHeap* _g1h; | |
2972 bool _allow_dirty; | |
811 | 2973 bool _use_prev_marking; |
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2974 bool _failures; |
390 | 2975 |
2976 public: | |
811 | 2977 // use_prev_marking == true -> use "prev" marking information, |
2978 // use_prev_marking == false -> use "next" marking information | |
2979 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, | |
2980 bool use_prev_marking) : | |
390 | 2981 AbstractGangTask("Parallel verify task"), |
845
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2982 _g1h(g1h), |
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2983 _allow_dirty(allow_dirty), |
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2984 _use_prev_marking(use_prev_marking), |
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2985 _failures(false) { } |
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2986 |
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2987 bool failures() { |
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2988 return _failures; |
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2989 } |
390 | 2990 |
2991 void work(int worker_i) { | |
637
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2992 HandleMark hm; |
811 | 2993 VerifyRegionClosure blk(_allow_dirty, true, _use_prev_marking); |
390 | 2994 _g1h->heap_region_par_iterate_chunked(&blk, worker_i, |
2995 HeapRegion::ParVerifyClaimValue); | |
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2996 if (blk.failures()) { |
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2997 _failures = true; |
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2998 } |
390 | 2999 } |
3000 }; | |
3001 | |
342 | 3002 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
811 | 3003 verify(allow_dirty, silent, /* use_prev_marking */ true); |
3004 } | |
3005 | |
3006 void G1CollectedHeap::verify(bool allow_dirty, | |
3007 bool silent, | |
3008 bool use_prev_marking) { | |
342 | 3009 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
3010 if (!silent) { gclog_or_tty->print("roots "); } | |
811 | 3011 VerifyRootsClosure rootsCl(use_prev_marking); |
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3012 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
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3013 process_strong_roots(true, // activate StrongRootsScope |
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3014 false, |
342 | 3015 SharedHeap::SO_AllClasses, |
3016 &rootsCl, | |
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3017 &blobsCl, |
342 | 3018 &rootsCl); |
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3019 bool failures = rootsCl.failures(); |
342 | 3020 rem_set()->invalidate(perm_gen()->used_region(), false); |
2152 | 3021 if (!silent) { gclog_or_tty->print("HeapRegionSets "); } |
3022 verify_region_sets(); | |
3023 if (!silent) { gclog_or_tty->print("HeapRegions "); } | |
390 | 3024 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
3025 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
3026 "sanity check"); | |
3027 | |
811 | 3028 G1ParVerifyTask task(this, allow_dirty, use_prev_marking); |
390 | 3029 int n_workers = workers()->total_workers(); |
3030 set_par_threads(n_workers); | |
3031 workers()->run_task(&task); | |
3032 set_par_threads(0); | |
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3033 if (task.failures()) { |
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3034 failures = true; |
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3035 } |
390 | 3036 |
3037 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), | |
3038 "sanity check"); | |
3039 | |
3040 reset_heap_region_claim_values(); | |
3041 | |
3042 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
3043 "sanity check"); | |
3044 } else { | |
811 | 3045 VerifyRegionClosure blk(allow_dirty, false, use_prev_marking); |
390 | 3046 _hrs->iterate(&blk); |
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3047 if (blk.failures()) { |
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3048 failures = true; |
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3049 } |
390 | 3050 } |
2152 | 3051 if (!silent) gclog_or_tty->print("RemSet "); |
342 | 3052 rem_set()->verify(); |
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3053 |
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3054 if (failures) { |
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3055 gclog_or_tty->print_cr("Heap:"); |
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3056 print_on(gclog_or_tty, true /* extended */); |
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3057 gclog_or_tty->print_cr(""); |
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3058 #ifndef PRODUCT |
1044 | 3059 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
1388 | 3060 concurrent_mark()->print_reachable("at-verification-failure", |
3061 use_prev_marking, false /* all */); | |
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3062 } |
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3063 #endif |
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3064 gclog_or_tty->flush(); |
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3065 } |
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|
3066 guarantee(!failures, "there should not have been any failures"); |
342 | 3067 } else { |
3068 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
3069 } | |
3070 } | |
3071 | |
3072 class PrintRegionClosure: public HeapRegionClosure { | |
3073 outputStream* _st; | |
3074 public: | |
3075 PrintRegionClosure(outputStream* st) : _st(st) {} | |
3076 bool doHeapRegion(HeapRegion* r) { | |
3077 r->print_on(_st); | |
3078 return false; | |
3079 } | |
3080 }; | |
3081 | |
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3082 void G1CollectedHeap::print() const { print_on(tty); } |
342 | 3083 |
3084 void G1CollectedHeap::print_on(outputStream* st) const { | |
838
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3085 print_on(st, PrintHeapAtGCExtended); |
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3086 } |
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3087 |
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3088 void G1CollectedHeap::print_on(outputStream* st, bool extended) const { |
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3089 st->print(" %-20s", "garbage-first heap"); |
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3090 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
846
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3091 capacity()/K, used_unlocked()/K); |
838
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3092 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
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3093 _g1_storage.low_boundary(), |
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3094 _g1_storage.high(), |
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|
3095 _g1_storage.high_boundary()); |
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3096 st->cr(); |
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3097 st->print(" region size " SIZE_FORMAT "K, ", |
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3098 HeapRegion::GrainBytes/K); |
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3099 size_t young_regions = _young_list->length(); |
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3100 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
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3101 young_regions, young_regions * HeapRegion::GrainBytes / K); |
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3102 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
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3103 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
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3104 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
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3105 st->cr(); |
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3106 perm()->as_gen()->print_on(st); |
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3107 if (extended) { |
1020
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3108 st->cr(); |
838
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3109 print_on_extended(st); |
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3110 } |
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3111 } |
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3112 |
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3113 void G1CollectedHeap::print_on_extended(outputStream* st) const { |
342 | 3114 PrintRegionClosure blk(st); |
3115 _hrs->iterate(&blk); | |
3116 } | |
3117 | |
3118 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
1833
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3119 if (G1CollectedHeap::use_parallel_gc_threads()) { |
1019 | 3120 workers()->print_worker_threads_on(st); |
3121 } | |
3122 _cmThread->print_on(st); | |
342 | 3123 st->cr(); |
1019 | 3124 _cm->print_worker_threads_on(st); |
3125 _cg1r->print_worker_threads_on(st); | |
342 | 3126 st->cr(); |
3127 } | |
3128 | |
3129 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
1833
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3130 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3131 workers()->threads_do(tc); |
3132 } | |
3133 tc->do_thread(_cmThread); | |
794 | 3134 _cg1r->threads_do(tc); |
342 | 3135 } |
3136 | |
3137 void G1CollectedHeap::print_tracing_info() const { | |
3138 // We'll overload this to mean "trace GC pause statistics." | |
3139 if (TraceGen0Time || TraceGen1Time) { | |
3140 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
3141 // to that. | |
3142 g1_policy()->print_tracing_info(); | |
3143 } | |
751 | 3144 if (G1SummarizeRSetStats) { |
342 | 3145 g1_rem_set()->print_summary_info(); |
3146 } | |
1282 | 3147 if (G1SummarizeConcMark) { |
342 | 3148 concurrent_mark()->print_summary_info(); |
3149 } | |
3150 g1_policy()->print_yg_surv_rate_info(); | |
3151 SpecializationStats::print(); | |
3152 } | |
3153 | |
3154 int G1CollectedHeap::addr_to_arena_id(void* addr) const { | |
3155 HeapRegion* hr = heap_region_containing(addr); | |
3156 if (hr == NULL) { | |
3157 return 0; | |
3158 } else { | |
3159 return 1; | |
3160 } | |
3161 } | |
3162 | |
3163 G1CollectedHeap* G1CollectedHeap::heap() { | |
3164 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
3165 "not a garbage-first heap"); | |
3166 return _g1h; | |
3167 } | |
3168 | |
3169 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
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3170 // always_do_update_barrier = false; |
342 | 3171 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
3172 // Call allocation profiler | |
3173 AllocationProfiler::iterate_since_last_gc(); | |
3174 // Fill TLAB's and such | |
3175 ensure_parsability(true); | |
3176 } | |
3177 | |
3178 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
3179 // FIXME: what is this about? | |
3180 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
3181 // is set. | |
3182 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
3183 "derived pointer present")); | |
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3184 // always_do_update_barrier = true; |
342 | 3185 } |
3186 | |
1973 | 3187 HeapWord* G1CollectedHeap::do_collection_pause(size_t word_size, |
3188 unsigned int gc_count_before, | |
3189 bool* succeeded) { | |
3190 assert_heap_not_locked_and_not_at_safepoint(); | |
342 | 3191 g1_policy()->record_stop_world_start(); |
1973 | 3192 VM_G1IncCollectionPause op(gc_count_before, |
3193 word_size, | |
3194 false, /* should_initiate_conc_mark */ | |
3195 g1_policy()->max_pause_time_ms(), | |
3196 GCCause::_g1_inc_collection_pause); | |
3197 VMThread::execute(&op); | |
3198 | |
3199 HeapWord* result = op.result(); | |
3200 bool ret_succeeded = op.prologue_succeeded() && op.pause_succeeded(); | |
3201 assert(result == NULL || ret_succeeded, | |
3202 "the result should be NULL if the VM did not succeed"); | |
3203 *succeeded = ret_succeeded; | |
3204 | |
3205 assert_heap_not_locked(); | |
3206 return result; | |
342 | 3207 } |
3208 | |
3209 void | |
3210 G1CollectedHeap::doConcurrentMark() { | |
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3211 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
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3212 if (!_cmThread->in_progress()) { |
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3213 _cmThread->set_started(); |
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3214 CGC_lock->notify(); |
342 | 3215 } |
3216 } | |
3217 | |
3218 class VerifyMarkedObjsClosure: public ObjectClosure { | |
3219 G1CollectedHeap* _g1h; | |
3220 public: | |
3221 VerifyMarkedObjsClosure(G1CollectedHeap* g1h) : _g1h(g1h) {} | |
3222 void do_object(oop obj) { | |
3223 assert(obj->mark()->is_marked() ? !_g1h->is_obj_dead(obj) : true, | |
3224 "markandsweep mark should agree with concurrent deadness"); | |
3225 } | |
3226 }; | |
3227 | |
3228 void | |
3229 G1CollectedHeap::checkConcurrentMark() { | |
3230 VerifyMarkedObjsClosure verifycl(this); | |
3231 // MutexLockerEx x(getMarkBitMapLock(), | |
3232 // Mutex::_no_safepoint_check_flag); | |
678 | 3233 object_iterate(&verifycl, false); |
342 | 3234 } |
3235 | |
3236 void G1CollectedHeap::do_sync_mark() { | |
3237 _cm->checkpointRootsInitial(); | |
3238 _cm->markFromRoots(); | |
3239 _cm->checkpointRootsFinal(false); | |
3240 } | |
3241 | |
3242 // <NEW PREDICTION> | |
3243 | |
3244 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
3245 bool young) { | |
3246 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
3247 } | |
3248 | |
3249 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
3250 predicted_time_ms) { | |
3251 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
3252 } | |
3253 | |
3254 size_t G1CollectedHeap::pending_card_num() { | |
3255 size_t extra_cards = 0; | |
3256 JavaThread *curr = Threads::first(); | |
3257 while (curr != NULL) { | |
3258 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
3259 extra_cards += dcq.size(); | |
3260 curr = curr->next(); | |
3261 } | |
3262 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3263 size_t buffer_size = dcqs.buffer_size(); | |
3264 size_t buffer_num = dcqs.completed_buffers_num(); | |
3265 return buffer_size * buffer_num + extra_cards; | |
3266 } | |
3267 | |
3268 size_t G1CollectedHeap::max_pending_card_num() { | |
3269 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3270 size_t buffer_size = dcqs.buffer_size(); | |
3271 size_t buffer_num = dcqs.completed_buffers_num(); | |
3272 int thread_num = Threads::number_of_threads(); | |
3273 return (buffer_num + thread_num) * buffer_size; | |
3274 } | |
3275 | |
3276 size_t G1CollectedHeap::cards_scanned() { | |
1861 | 3277 return g1_rem_set()->cardsScanned(); |
342 | 3278 } |
3279 | |
3280 void | |
3281 G1CollectedHeap::setup_surviving_young_words() { | |
3282 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
3283 size_t array_length = g1_policy()->young_cset_length(); | |
3284 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); | |
3285 if (_surviving_young_words == NULL) { | |
3286 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
3287 "Not enough space for young surv words summary."); | |
3288 } | |
3289 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
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3290 #ifdef ASSERT |
342 | 3291 for (size_t i = 0; i < array_length; ++i) { |
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3292 assert( _surviving_young_words[i] == 0, "memset above" ); |
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3293 } |
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3294 #endif // !ASSERT |
342 | 3295 } |
3296 | |
3297 void | |
3298 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
3299 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
3300 size_t array_length = g1_policy()->young_cset_length(); | |
3301 for (size_t i = 0; i < array_length; ++i) | |
3302 _surviving_young_words[i] += surv_young_words[i]; | |
3303 } | |
3304 | |
3305 void | |
3306 G1CollectedHeap::cleanup_surviving_young_words() { | |
3307 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
3308 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
3309 _surviving_young_words = NULL; | |
3310 } | |
3311 | |
3312 // </NEW PREDICTION> | |
3313 | |
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3314 struct PrepareForRSScanningClosure : public HeapRegionClosure { |
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3315 bool doHeapRegion(HeapRegion *r) { |
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3316 r->rem_set()->set_iter_claimed(0); |
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3317 return false; |
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|
3318 } |
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|
3319 }; |
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3320 |
1709 | 3321 #if TASKQUEUE_STATS |
3322 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
3323 st->print_raw_cr("GC Task Stats"); | |
3324 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
3325 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
3326 } | |
3327 | |
3328 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
3329 print_taskqueue_stats_hdr(st); | |
3330 | |
3331 TaskQueueStats totals; | |
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6978300: G1: debug builds crash if ParallelGCThreads==0
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3332 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3333 for (int i = 0; i < n; ++i) { |
3334 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
3335 totals += task_queue(i)->stats; | |
3336 } | |
3337 st->print_raw("tot "); totals.print(st); st->cr(); | |
3338 | |
3339 DEBUG_ONLY(totals.verify()); | |
3340 } | |
3341 | |
3342 void G1CollectedHeap::reset_taskqueue_stats() { | |
1755
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3343 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3344 for (int i = 0; i < n; ++i) { |
3345 task_queue(i)->stats.reset(); | |
3346 } | |
3347 } | |
3348 #endif // TASKQUEUE_STATS | |
3349 | |
1973 | 3350 bool |
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3351 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
2152 | 3352 assert_at_safepoint(true /* should_be_vm_thread */); |
3353 guarantee(!is_gc_active(), "collection is not reentrant"); | |
3354 | |
1359
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|
3355 if (GC_locker::check_active_before_gc()) { |
1973 | 3356 return false; |
1359
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3357 } |
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3358 |
2125
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3359 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
2039
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3360 ResourceMark rm; |
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3361 |
838
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3362 if (PrintHeapAtGC) { |
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3363 Universe::print_heap_before_gc(); |
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3364 } |
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|
3365 |
2152 | 3366 verify_region_sets_optional(); |
3367 | |
838
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3368 { |
1359
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3369 // This call will decide whether this pause is an initial-mark |
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3370 // pause. If it is, during_initial_mark_pause() will return true |
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3371 // for the duration of this pause. |
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3372 g1_policy()->decide_on_conc_mark_initiation(); |
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|
3373 |
838
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|
3374 char verbose_str[128]; |
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|
3375 sprintf(verbose_str, "GC pause "); |
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3376 if (g1_policy()->in_young_gc_mode()) { |
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|
3377 if (g1_policy()->full_young_gcs()) |
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3378 strcat(verbose_str, "(young)"); |
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|
3379 else |
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|
3380 strcat(verbose_str, "(partial)"); |
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|
3381 } |
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|
3382 if (g1_policy()->during_initial_mark_pause()) { |
838
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|
3383 strcat(verbose_str, " (initial-mark)"); |
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changeset
|
3384 // We are about to start a marking cycle, so we increment the |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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|
3385 // full collection counter. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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|
3386 increment_total_full_collections(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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|
3387 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3388 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3389 // if PrintGCDetails is on, we'll print long statistics information |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3390 // in the collector policy code, so let's not print this as the output |
0316eac49d5a
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|
3391 // is messy if we do. |
0316eac49d5a
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|
3392 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3393 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3394 TraceTime t(verbose_str, PrintGC && !PrintGCDetails, true, gclog_or_tty); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3395 |
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
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1088
diff
changeset
|
3396 TraceMemoryManagerStats tms(false /* fullGC */); |
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
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1088
diff
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|
3397 |
2361 | 3398 // If the secondary_free_list is not empty, append it to the |
3399 // free_list. No need to wait for the cleanup operation to finish; | |
3400 // the region allocation code will check the secondary_free_list | |
3401 // and wait if necessary. If the G1StressConcRegionFreeing flag is | |
3402 // set, skip this step so that the region allocation code has to | |
3403 // get entries from the secondary_free_list. | |
2152 | 3404 if (!G1StressConcRegionFreeing) { |
2361 | 3405 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 3406 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3407 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3408 increment_gc_time_stamp(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3409 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3410 if (g1_policy()->in_young_gc_mode()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3411 assert(check_young_list_well_formed(), |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3412 "young list should be well formed"); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3413 } |
0316eac49d5a
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|
3414 |
0316eac49d5a
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|
3415 { // Call to jvmpi::post_class_unload_events must occur outside of active GC |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3416 IsGCActiveMark x; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3417 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3418 gc_prologue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3419 increment_total_collections(false /* full gc */); |
342 | 3420 |
3421 #if G1_REM_SET_LOGGING | |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3422 gclog_or_tty->print_cr("\nJust chose CS, heap:"); |
0316eac49d5a
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|
3423 print(); |
342 | 3424 #endif |
3425 | |
838
0316eac49d5a
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tonyp
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|
3426 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3427 HandleMark hm; // Discard invalid handles created during verification |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3428 prepare_for_verify(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3429 gclog_or_tty->print(" VerifyBeforeGC:"); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3430 Universe::verify(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3431 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3432 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3433 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3434 |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
3435 // Please see comment in G1CollectedHeap::ref_processing_init() |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
3436 // to see how reference processing currently works in G1. |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
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|
3437 // |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
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|
3438 // We want to turn off ref discovery, if necessary, and turn it back on |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3439 // on again later if we do. XXX Dubious: why is discovery disabled? |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
3440 bool was_enabled = ref_processor()->discovery_enabled(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3441 if (was_enabled) ref_processor()->disable_discovery(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3442 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3443 // Forget the current alloc region (we might even choose it to be part |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
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|
3444 // of the collection set!). |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3445 abandon_cur_alloc_region(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3446 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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changeset
|
3447 // The elapsed time induced by the start time below deliberately elides |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3448 // the possible verification above. |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3449 double start_time_sec = os::elapsedTime(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3450 size_t start_used_bytes = used(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3451 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
3452 #if YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
3453 gclog_or_tty->print_cr("\nBefore recording pause start.\nYoung_list:"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
3454 _young_list->print(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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diff
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|
3455 g1_policy()->print_collection_set(g1_policy()->inc_cset_head(), gclog_or_tty); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
3456 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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diff
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|
3457 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3458 g1_policy()->record_collection_pause_start(start_time_sec, |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
3459 start_used_bytes); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3460 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
3461 #if YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
3462 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
3463 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3464 #endif // YOUNG_LIST_VERBOSE |
342 | 3465 |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3466 if (g1_policy()->during_initial_mark_pause()) { |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
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|
3467 concurrent_mark()->checkpointRootsInitialPre(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3468 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
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|
3469 save_marks(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3470 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3471 // We must do this before any possible evacuation that should propagate |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
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|
3472 // marks. |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3473 if (mark_in_progress()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3474 double start_time_sec = os::elapsedTime(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
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|
3475 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
changeset
|
3476 _cm->drainAllSATBBuffers(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3477 double finish_mark_ms = (os::elapsedTime() - start_time_sec) * 1000.0; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
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|
3478 g1_policy()->record_satb_drain_time(finish_mark_ms); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3479 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3480 // Record the number of elements currently on the mark stack, so we |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
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|
3481 // only iterate over these. (Since evacuation may add to the mark |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3482 // stack, doing more exposes race conditions.) If no mark is in |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3483 // progress, this will be zero. |
0316eac49d5a
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|
3484 _cm->set_oops_do_bound(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3485 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3486 if (mark_in_progress()) |
0316eac49d5a
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|
3487 concurrent_mark()->newCSet(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3488 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
3489 #if YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
3490 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
3491 _young_list->print(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
3492 g1_policy()->print_collection_set(g1_policy()->inc_cset_head(), gclog_or_tty); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
3493 #endif // YOUNG_LIST_VERBOSE |
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|
3494 |
1707 | 3495 g1_policy()->choose_collection_set(target_pause_time_ms); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3496 |
0316eac49d5a
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diff
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|
3497 // Nothing to do if we were unable to choose a collection set. |
342 | 3498 #if G1_REM_SET_LOGGING |
1707 | 3499 gclog_or_tty->print_cr("\nAfter pause, heap:"); |
3500 print(); | |
342 | 3501 #endif |
1707 | 3502 PrepareForRSScanningClosure prepare_for_rs_scan; |
3503 collection_set_iterate(&prepare_for_rs_scan); | |
3504 | |
3505 setup_surviving_young_words(); | |
3506 | |
3507 // Set up the gc allocation regions. | |
3508 get_gc_alloc_regions(); | |
3509 | |
3510 // Actually do the work... | |
3511 evacuate_collection_set(); | |
3512 | |
3513 free_collection_set(g1_policy()->collection_set()); | |
3514 g1_policy()->clear_collection_set(); | |
3515 | |
3516 cleanup_surviving_young_words(); | |
3517 | |
3518 // Start a new incremental collection set for the next pause. | |
3519 g1_policy()->start_incremental_cset_building(); | |
3520 | |
3521 // Clear the _cset_fast_test bitmap in anticipation of adding | |
3522 // regions to the incremental collection set for the next | |
3523 // evacuation pause. | |
3524 clear_cset_fast_test(); | |
3525 | |
3526 if (g1_policy()->in_young_gc_mode()) { | |
3527 _young_list->reset_sampled_info(); | |
3528 | |
3529 // Don't check the whole heap at this point as the | |
3530 // GC alloc regions from this pause have been tagged | |
3531 // as survivors and moved on to the survivor list. | |
3532 // Survivor regions will fail the !is_young() check. | |
3533 assert(check_young_list_empty(false /* check_heap */), | |
3534 "young list should be empty"); | |
1394
1316cec51b4d
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1391
diff
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|
3535 |
1316cec51b4d
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diff
changeset
|
3536 #if YOUNG_LIST_VERBOSE |
1707 | 3537 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
3538 _young_list->print(); | |
1394
1316cec51b4d
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diff
changeset
|
3539 #endif // YOUNG_LIST_VERBOSE |
342 | 3540 |
1707 | 3541 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
838
0316eac49d5a
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|
3542 _young_list->first_survivor_region(), |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
811
diff
changeset
|
3543 _young_list->last_survivor_region()); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3544 |
1707 | 3545 _young_list->reset_auxilary_lists(); |
342 | 3546 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3547 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3548 if (evacuation_failed()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3549 _summary_bytes_used = recalculate_used(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3550 } else { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3551 // The "used" of the the collection set have already been subtracted |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3552 // when they were freed. Add in the bytes evacuated. |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3553 _summary_bytes_used += g1_policy()->bytes_in_to_space(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3554 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3555 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3556 if (g1_policy()->in_young_gc_mode() && |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3557 g1_policy()->during_initial_mark_pause()) { |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3558 concurrent_mark()->checkpointRootsInitialPost(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3559 set_marking_started(); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3560 // CAUTION: after the doConcurrentMark() call below, |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3561 // the concurrent marking thread(s) could be running |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3562 // concurrently with us. Make sure that anything after |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3563 // this point does not assume that we are the only GC thread |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3564 // running. Note: of course, the actual marking work will |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3565 // not start until the safepoint itself is released in |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3566 // ConcurrentGCThread::safepoint_desynchronize(). |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3567 doConcurrentMark(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3568 } |
342 | 3569 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3570 #if YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3571 gclog_or_tty->print_cr("\nEnd of the pause.\nYoung_list:"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3572 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3573 g1_policy()->print_collection_set(g1_policy()->inc_cset_head(), gclog_or_tty); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3574 #endif // YOUNG_LIST_VERBOSE |
342 | 3575 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3576 double end_time_sec = os::elapsedTime(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3577 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3578 g1_policy()->record_pause_time_ms(pause_time_ms); |
1707 | 3579 g1_policy()->record_collection_pause_end(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3580 |
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3581 MemoryService::track_memory_usage(); |
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3582 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3583 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3584 HandleMark hm; // Discard invalid handles created during verification |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3585 gclog_or_tty->print(" VerifyAfterGC:"); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3586 prepare_for_verify(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3587 Universe::verify(false); |
342 | 3588 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3589 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3590 if (was_enabled) ref_processor()->enable_discovery(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3591 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3592 { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3593 size_t expand_bytes = g1_policy()->expansion_amount(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3594 if (expand_bytes > 0) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3595 size_t bytes_before = capacity(); |
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3596 if (!expand(expand_bytes)) { |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3597 // We failed to expand the heap so let's verify that |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3598 // committed/uncommitted amount match the backing store |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3599 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3600 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3601 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3602 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3603 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3604 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3605 if (mark_in_progress()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3606 concurrent_mark()->update_g1_committed(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3607 } |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3608 |
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3609 #ifdef TRACESPINNING |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3610 ParallelTaskTerminator::print_termination_counts(); |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3611 #endif |
342 | 3612 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3613 gc_epilogue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3614 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3615 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3616 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3617 gclog_or_tty->print_cr("Stopping after GC #%d", ExitAfterGCNum); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3618 print_tracing_info(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3619 vm_exit(-1); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3620 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3621 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3622 |
2152 | 3623 verify_region_sets_optional(); |
3624 | |
1709 | 3625 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
3626 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); | |
3627 | |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3628 if (PrintHeapAtGC) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3629 Universe::print_heap_after_gc(); |
342 | 3630 } |
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3631 if (G1SummarizeRSetStats && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3632 (G1SummarizeRSetStatsPeriod > 0) && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3633 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3634 g1_rem_set()->print_summary_info(); |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3635 } |
1973 | 3636 |
3637 return true; | |
342 | 3638 } |
3639 | |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3640 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3641 { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3642 size_t gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3643 switch (purpose) { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3644 case GCAllocForSurvived: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3645 gclab_word_size = YoungPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3646 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3647 case GCAllocForTenured: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3648 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3649 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3650 default: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3651 assert(false, "unknown GCAllocPurpose"); |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3652 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3653 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3654 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3655 return gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3656 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3657 |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3658 |
342 | 3659 void G1CollectedHeap::set_gc_alloc_region(int purpose, HeapRegion* r) { |
3660 assert(purpose >= 0 && purpose < GCAllocPurposeCount, "invalid purpose"); | |
636 | 3661 // make sure we don't call set_gc_alloc_region() multiple times on |
3662 // the same region | |
3663 assert(r == NULL || !r->is_gc_alloc_region(), | |
3664 "shouldn't already be a GC alloc region"); | |
1360
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3665 assert(r == NULL || !r->isHumongous(), |
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3666 "humongous regions shouldn't be used as GC alloc regions"); |
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3667 |
342 | 3668 HeapWord* original_top = NULL; |
3669 if (r != NULL) | |
3670 original_top = r->top(); | |
3671 | |
3672 // We will want to record the used space in r as being there before gc. | |
3673 // One we install it as a GC alloc region it's eligible for allocation. | |
3674 // So record it now and use it later. | |
3675 size_t r_used = 0; | |
3676 if (r != NULL) { | |
3677 r_used = r->used(); | |
3678 | |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
3679 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3680 // need to take the lock to guard against two threads calling |
3681 // get_gc_alloc_region concurrently (very unlikely but...) | |
3682 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
3683 r->save_marks(); | |
3684 } | |
3685 } | |
3686 HeapRegion* old_alloc_region = _gc_alloc_regions[purpose]; | |
3687 _gc_alloc_regions[purpose] = r; | |
3688 if (old_alloc_region != NULL) { | |
3689 // Replace aliases too. | |
3690 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
3691 if (_gc_alloc_regions[ap] == old_alloc_region) { | |
3692 _gc_alloc_regions[ap] = r; | |
3693 } | |
3694 } | |
3695 } | |
3696 if (r != NULL) { | |
3697 push_gc_alloc_region(r); | |
3698 if (mark_in_progress() && original_top != r->next_top_at_mark_start()) { | |
3699 // We are using a region as a GC alloc region after it has been used | |
3700 // as a mutator allocation region during the current marking cycle. | |
3701 // The mutator-allocated objects are currently implicitly marked, but | |
3702 // when we move hr->next_top_at_mark_start() forward at the the end | |
3703 // of the GC pause, they won't be. We therefore mark all objects in | |
3704 // the "gap". We do this object-by-object, since marking densely | |
3705 // does not currently work right with marking bitmap iteration. This | |
3706 // means we rely on TLAB filling at the start of pauses, and no | |
3707 // "resuscitation" of filled TLAB's. If we want to do this, we need | |
3708 // to fix the marking bitmap iteration. | |
3709 HeapWord* curhw = r->next_top_at_mark_start(); | |
3710 HeapWord* t = original_top; | |
3711 | |
3712 while (curhw < t) { | |
3713 oop cur = (oop)curhw; | |
3714 // We'll assume parallel for generality. This is rare code. | |
3715 concurrent_mark()->markAndGrayObjectIfNecessary(cur); // can't we just mark them? | |
3716 curhw = curhw + cur->size(); | |
3717 } | |
3718 assert(curhw == t, "Should have parsed correctly."); | |
3719 } | |
3720 if (G1PolicyVerbose > 1) { | |
3721 gclog_or_tty->print("New alloc region ["PTR_FORMAT", "PTR_FORMAT", " PTR_FORMAT") " | |
3722 "for survivors:", r->bottom(), original_top, r->end()); | |
3723 r->print(); | |
3724 } | |
3725 g1_policy()->record_before_bytes(r_used); | |
3726 } | |
3727 } | |
3728 | |
3729 void G1CollectedHeap::push_gc_alloc_region(HeapRegion* hr) { | |
3730 assert(Thread::current()->is_VM_thread() || | |
2152 | 3731 FreeList_lock->owned_by_self(), "Precondition"); |
342 | 3732 assert(!hr->is_gc_alloc_region() && !hr->in_collection_set(), |
3733 "Precondition."); | |
3734 hr->set_is_gc_alloc_region(true); | |
3735 hr->set_next_gc_alloc_region(_gc_alloc_region_list); | |
3736 _gc_alloc_region_list = hr; | |
3737 } | |
3738 | |
3739 #ifdef G1_DEBUG | |
3740 class FindGCAllocRegion: public HeapRegionClosure { | |
3741 public: | |
3742 bool doHeapRegion(HeapRegion* r) { | |
3743 if (r->is_gc_alloc_region()) { | |
3744 gclog_or_tty->print_cr("Region %d ["PTR_FORMAT"...] is still a gc_alloc_region.", | |
3745 r->hrs_index(), r->bottom()); | |
3746 } | |
3747 return false; | |
3748 } | |
3749 }; | |
3750 #endif // G1_DEBUG | |
3751 | |
3752 void G1CollectedHeap::forget_alloc_region_list() { | |
2152 | 3753 assert_at_safepoint(true /* should_be_vm_thread */); |
342 | 3754 while (_gc_alloc_region_list != NULL) { |
3755 HeapRegion* r = _gc_alloc_region_list; | |
3756 assert(r->is_gc_alloc_region(), "Invariant."); | |
637
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3757 // We need HeapRegion::oops_on_card_seq_iterate_careful() to work on |
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3758 // newly allocated data in order to be able to apply deferred updates |
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3759 // before the GC is done for verification purposes (i.e to allow |
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3760 // G1HRRSFlushLogBuffersOnVerify). It's safe thing to do after the |
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3761 // collection. |
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3762 r->ContiguousSpace::set_saved_mark(); |
342 | 3763 _gc_alloc_region_list = r->next_gc_alloc_region(); |
3764 r->set_next_gc_alloc_region(NULL); | |
3765 r->set_is_gc_alloc_region(false); | |
545 | 3766 if (r->is_survivor()) { |
3767 if (r->is_empty()) { | |
3768 r->set_not_young(); | |
3769 } else { | |
3770 _young_list->add_survivor_region(r); | |
3771 } | |
3772 } | |
342 | 3773 } |
3774 #ifdef G1_DEBUG | |
3775 FindGCAllocRegion fa; | |
3776 heap_region_iterate(&fa); | |
3777 #endif // G1_DEBUG | |
3778 } | |
3779 | |
3780 | |
3781 bool G1CollectedHeap::check_gc_alloc_regions() { | |
3782 // TODO: allocation regions check | |
3783 return true; | |
3784 } | |
3785 | |
3786 void G1CollectedHeap::get_gc_alloc_regions() { | |
636 | 3787 // First, let's check that the GC alloc region list is empty (it should) |
3788 assert(_gc_alloc_region_list == NULL, "invariant"); | |
3789 | |
342 | 3790 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
636 | 3791 assert(_gc_alloc_regions[ap] == NULL, "invariant"); |
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3792 assert(_gc_alloc_region_counts[ap] == 0, "invariant"); |
636 | 3793 |
342 | 3794 // Create new GC alloc regions. |
636 | 3795 HeapRegion* alloc_region = _retained_gc_alloc_regions[ap]; |
3796 _retained_gc_alloc_regions[ap] = NULL; | |
3797 | |
3798 if (alloc_region != NULL) { | |
3799 assert(_retain_gc_alloc_region[ap], "only way to retain a GC region"); | |
3800 | |
3801 // let's make sure that the GC alloc region is not tagged as such | |
3802 // outside a GC operation | |
3803 assert(!alloc_region->is_gc_alloc_region(), "sanity"); | |
3804 | |
3805 if (alloc_region->in_collection_set() || | |
3806 alloc_region->top() == alloc_region->end() || | |
1360
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3807 alloc_region->top() == alloc_region->bottom() || |
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3808 alloc_region->isHumongous()) { |
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3809 // we will discard the current GC alloc region if |
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3810 // * it's in the collection set (it can happen!), |
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3811 // * it's already full (no point in using it), |
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3812 // * it's empty (this means that it was emptied during |
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3813 // a cleanup and it should be on the free list now), or |
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3814 // * it's humongous (this means that it was emptied |
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3815 // during a cleanup and was added to the free list, but |
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3816 // has been subseqently used to allocate a humongous |
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|
3817 // object that may be less than the region size). |
636 | 3818 |
3819 alloc_region = NULL; | |
3820 } | |
3821 } | |
3822 | |
3823 if (alloc_region == NULL) { | |
3824 // we will get a new GC alloc region | |
2188
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3825 alloc_region = new_gc_alloc_region(ap, HeapRegion::GrainWords); |
861
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3826 } else { |
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3827 // the region was retained from the last collection |
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3828 ++_gc_alloc_region_counts[ap]; |
1388 | 3829 if (G1PrintHeapRegions) { |
3830 gclog_or_tty->print_cr("new alloc region %d:["PTR_FORMAT", "PTR_FORMAT"], " | |
3831 "top "PTR_FORMAT, | |
3832 alloc_region->hrs_index(), alloc_region->bottom(), alloc_region->end(), alloc_region->top()); | |
3833 } | |
342 | 3834 } |
636 | 3835 |
342 | 3836 if (alloc_region != NULL) { |
636 | 3837 assert(_gc_alloc_regions[ap] == NULL, "pre-condition"); |
342 | 3838 set_gc_alloc_region(ap, alloc_region); |
3839 } | |
636 | 3840 |
3841 assert(_gc_alloc_regions[ap] == NULL || | |
3842 _gc_alloc_regions[ap]->is_gc_alloc_region(), | |
3843 "the GC alloc region should be tagged as such"); | |
3844 assert(_gc_alloc_regions[ap] == NULL || | |
3845 _gc_alloc_regions[ap] == _gc_alloc_region_list, | |
3846 "the GC alloc region should be the same as the GC alloc list head"); | |
342 | 3847 } |
3848 // Set alternative regions for allocation purposes that have reached | |
636 | 3849 // their limit. |
342 | 3850 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
3851 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(ap); | |
3852 if (_gc_alloc_regions[ap] == NULL && alt_purpose != ap) { | |
3853 _gc_alloc_regions[ap] = _gc_alloc_regions[alt_purpose]; | |
3854 } | |
3855 } | |
3856 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
3857 } | |
3858 | |
636 | 3859 void G1CollectedHeap::release_gc_alloc_regions(bool totally) { |
342 | 3860 // We keep a separate list of all regions that have been alloc regions in |
636 | 3861 // the current collection pause. Forget that now. This method will |
3862 // untag the GC alloc regions and tear down the GC alloc region | |
3863 // list. It's desirable that no regions are tagged as GC alloc | |
3864 // outside GCs. | |
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3865 |
342 | 3866 forget_alloc_region_list(); |
3867 | |
3868 // The current alloc regions contain objs that have survived | |
3869 // collection. Make them no longer GC alloc regions. | |
3870 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
3871 HeapRegion* r = _gc_alloc_regions[ap]; | |
636 | 3872 _retained_gc_alloc_regions[ap] = NULL; |
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3873 _gc_alloc_region_counts[ap] = 0; |
636 | 3874 |
3875 if (r != NULL) { | |
3876 // we retain nothing on _gc_alloc_regions between GCs | |
3877 set_gc_alloc_region(ap, NULL); | |
3878 | |
3879 if (r->is_empty()) { | |
2152 | 3880 // We didn't actually allocate anything in it; let's just put |
3881 // it back on the free list. | |
3882 _free_list.add_as_tail(r); | |
636 | 3883 } else if (_retain_gc_alloc_region[ap] && !totally) { |
3884 // retain it so that we can use it at the beginning of the next GC | |
3885 _retained_gc_alloc_regions[ap] = r; | |
342 | 3886 } |
3887 } | |
636 | 3888 } |
3889 } | |
3890 | |
3891 #ifndef PRODUCT | |
3892 // Useful for debugging | |
3893 | |
3894 void G1CollectedHeap::print_gc_alloc_regions() { | |
3895 gclog_or_tty->print_cr("GC alloc regions"); | |
3896 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
3897 HeapRegion* r = _gc_alloc_regions[ap]; | |
3898 if (r == NULL) { | |
3899 gclog_or_tty->print_cr(" %2d : "PTR_FORMAT, ap, NULL); | |
3900 } else { | |
3901 gclog_or_tty->print_cr(" %2d : "PTR_FORMAT" "SIZE_FORMAT, | |
3902 ap, r->bottom(), r->used()); | |
3903 } | |
3904 } | |
3905 } | |
3906 #endif // PRODUCT | |
342 | 3907 |
3908 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
3909 _drain_in_progress = false; | |
3910 set_evac_failure_closure(cl); | |
3911 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
3912 } | |
3913 | |
3914 void G1CollectedHeap::finalize_for_evac_failure() { | |
3915 assert(_evac_failure_scan_stack != NULL && | |
3916 _evac_failure_scan_stack->length() == 0, | |
3917 "Postcondition"); | |
3918 assert(!_drain_in_progress, "Postcondition"); | |
1045 | 3919 delete _evac_failure_scan_stack; |
342 | 3920 _evac_failure_scan_stack = NULL; |
3921 } | |
3922 | |
3923 | |
3924 | |
3925 // *** Sequential G1 Evacuation | |
3926 | |
3927 class G1IsAliveClosure: public BoolObjectClosure { | |
3928 G1CollectedHeap* _g1; | |
3929 public: | |
3930 G1IsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
3931 void do_object(oop p) { assert(false, "Do not call."); } | |
3932 bool do_object_b(oop p) { | |
3933 // It is reachable if it is outside the collection set, or is inside | |
3934 // and forwarded. | |
3935 | |
3936 #ifdef G1_DEBUG | |
3937 gclog_or_tty->print_cr("is alive "PTR_FORMAT" in CS %d forwarded %d overall %d", | |
3938 (void*) p, _g1->obj_in_cs(p), p->is_forwarded(), | |
3939 !_g1->obj_in_cs(p) || p->is_forwarded()); | |
3940 #endif // G1_DEBUG | |
3941 | |
3942 return !_g1->obj_in_cs(p) || p->is_forwarded(); | |
3943 } | |
3944 }; | |
3945 | |
3946 class G1KeepAliveClosure: public OopClosure { | |
3947 G1CollectedHeap* _g1; | |
3948 public: | |
3949 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
845
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3950 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
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3951 void do_oop( oop* p) { |
342 | 3952 oop obj = *p; |
3953 #ifdef G1_DEBUG | |
3954 if (PrintGC && Verbose) { | |
3955 gclog_or_tty->print_cr("keep alive *"PTR_FORMAT" = "PTR_FORMAT" "PTR_FORMAT, | |
3956 p, (void*) obj, (void*) *p); | |
3957 } | |
3958 #endif // G1_DEBUG | |
3959 | |
3960 if (_g1->obj_in_cs(obj)) { | |
3961 assert( obj->is_forwarded(), "invariant" ); | |
3962 *p = obj->forwardee(); | |
3963 #ifdef G1_DEBUG | |
3964 gclog_or_tty->print_cr(" in CSet: moved "PTR_FORMAT" -> "PTR_FORMAT, | |
3965 (void*) obj, (void*) *p); | |
3966 #endif // G1_DEBUG | |
3967 } | |
3968 } | |
3969 }; | |
3970 | |
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3971 class UpdateRSetDeferred : public OopsInHeapRegionClosure { |
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3972 private: |
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3973 G1CollectedHeap* _g1; |
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3974 DirtyCardQueue *_dcq; |
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3975 CardTableModRefBS* _ct_bs; |
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3976 |
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3977 public: |
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3978 UpdateRSetDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
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3979 _g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) {} |
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3980 |
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3981 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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3982 virtual void do_oop( oop* p) { do_oop_work(p); } |
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3983 template <class T> void do_oop_work(T* p) { |
616
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3984 assert(_from->is_in_reserved(p), "paranoia"); |
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3985 if (!_from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && |
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3986 !_from->is_survivor()) { |
616
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3987 size_t card_index = _ct_bs->index_for(p); |
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3988 if (_ct_bs->mark_card_deferred(card_index)) { |
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3989 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
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3990 } |
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3991 } |
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3992 } |
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3993 }; |
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3994 |
342 | 3995 class RemoveSelfPointerClosure: public ObjectClosure { |
3996 private: | |
3997 G1CollectedHeap* _g1; | |
3998 ConcurrentMark* _cm; | |
3999 HeapRegion* _hr; | |
4000 size_t _prev_marked_bytes; | |
4001 size_t _next_marked_bytes; | |
616
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4002 OopsInHeapRegionClosure *_cl; |
342 | 4003 public: |
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4004 RemoveSelfPointerClosure(G1CollectedHeap* g1, HeapRegion* hr, |
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4005 OopsInHeapRegionClosure* cl) : |
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4006 _g1(g1), _hr(hr), _cm(_g1->concurrent_mark()), _prev_marked_bytes(0), |
616
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4007 _next_marked_bytes(0), _cl(cl) {} |
342 | 4008 |
4009 size_t prev_marked_bytes() { return _prev_marked_bytes; } | |
4010 size_t next_marked_bytes() { return _next_marked_bytes; } | |
4011 | |
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4012 // <original comment> |
352
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4013 // The original idea here was to coalesce evacuated and dead objects. |
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4014 // However that caused complications with the block offset table (BOT). |
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4015 // In particular if there were two TLABs, one of them partially refined. |
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4016 // |----- TLAB_1--------|----TLAB_2-~~~(partially refined part)~~~| |
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4017 // The BOT entries of the unrefined part of TLAB_2 point to the start |
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4018 // of TLAB_2. If the last object of the TLAB_1 and the first object |
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4019 // of TLAB_2 are coalesced, then the cards of the unrefined part |
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4020 // would point into middle of the filler object. |
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4021 // The current approach is to not coalesce and leave the BOT contents intact. |
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4022 // </original comment> |
352
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4023 // |
2133
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4024 // We now reset the BOT when we start the object iteration over the |
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4025 // region and refine its entries for every object we come across. So |
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4026 // the above comment is not really relevant and we should be able |
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4027 // to coalesce dead objects if we want to. |
352
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4028 void do_object(oop obj) { |
2133
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4029 HeapWord* obj_addr = (HeapWord*) obj; |
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4030 assert(_hr->is_in(obj_addr), "sanity"); |
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4031 size_t obj_size = obj->size(); |
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4032 _hr->update_bot_for_object(obj_addr, obj_size); |
352
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4033 if (obj->is_forwarded() && obj->forwardee() == obj) { |
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4034 // The object failed to move. |
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4035 assert(!_g1->is_obj_dead(obj), "We should not be preserving dead objs."); |
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4036 _cm->markPrev(obj); |
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4037 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
2133
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4038 _prev_marked_bytes += (obj_size * HeapWordSize); |
352
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4039 if (_g1->mark_in_progress() && !_g1->is_obj_ill(obj)) { |
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4040 _cm->markAndGrayObjectIfNecessary(obj); |
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4041 } |
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4042 obj->set_mark(markOopDesc::prototype()); |
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4043 // While we were processing RSet buffers during the |
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4044 // collection, we actually didn't scan any cards on the |
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4045 // collection set, since we didn't want to update remebered |
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4046 // sets with entries that point into the collection set, given |
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4047 // that live objects fromthe collection set are about to move |
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4048 // and such entries will be stale very soon. This change also |
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4049 // dealt with a reliability issue which involved scanning a |
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4050 // card in the collection set and coming across an array that |
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4051 // was being chunked and looking malformed. The problem is |
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4052 // that, if evacuation fails, we might have remembered set |
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4053 // entries missing given that we skipped cards on the |
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4054 // collection set. So, we'll recreate such entries now. |
616
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4055 obj->oop_iterate(_cl); |
352
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4056 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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4057 } else { |
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4058 // The object has been either evacuated or is dead. Fill it with a |
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4059 // dummy object. |
2133
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4060 MemRegion mr((HeapWord*)obj, obj_size); |
481
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4061 CollectedHeap::fill_with_object(mr); |
342 | 4062 _cm->clearRangeBothMaps(mr); |
4063 } | |
4064 } | |
4065 }; | |
4066 | |
4067 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
1705 | 4068 UpdateRSetImmediate immediate_update(_g1h->g1_rem_set()); |
616
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4069 DirtyCardQueue dcq(&_g1h->dirty_card_queue_set()); |
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4070 UpdateRSetDeferred deferred_update(_g1h, &dcq); |
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4071 OopsInHeapRegionClosure *cl; |
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4072 if (G1DeferredRSUpdate) { |
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4073 cl = &deferred_update; |
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4074 } else { |
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4075 cl = &immediate_update; |
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4076 } |
342 | 4077 HeapRegion* cur = g1_policy()->collection_set(); |
4078 while (cur != NULL) { | |
4079 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
2133
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4080 assert(!cur->isHumongous(), "sanity"); |
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4081 |
342 | 4082 if (cur->evacuation_failed()) { |
4083 assert(cur->in_collection_set(), "bad CS"); | |
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4084 RemoveSelfPointerClosure rspc(_g1h, cur, cl); |
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4085 |
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4086 cur->reset_bot(); |
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4087 cl->set_region(cur); |
342 | 4088 cur->object_iterate(&rspc); |
4089 | |
4090 // A number of manipulations to make the TAMS be the current top, | |
4091 // and the marked bytes be the ones observed in the iteration. | |
4092 if (_g1h->concurrent_mark()->at_least_one_mark_complete()) { | |
4093 // The comments below are the postconditions achieved by the | |
4094 // calls. Note especially the last such condition, which says that | |
4095 // the count of marked bytes has been properly restored. | |
4096 cur->note_start_of_marking(false); | |
4097 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
4098 cur->add_to_marked_bytes(rspc.prev_marked_bytes()); | |
4099 // _next_marked_bytes == prev_marked_bytes. | |
4100 cur->note_end_of_marking(); | |
4101 // _prev_top_at_mark_start == top(), | |
4102 // _prev_marked_bytes == prev_marked_bytes | |
4103 } | |
4104 // If there is no mark in progress, we modified the _next variables | |
4105 // above needlessly, but harmlessly. | |
4106 if (_g1h->mark_in_progress()) { | |
4107 cur->note_start_of_marking(false); | |
4108 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
4109 // _next_marked_bytes == next_marked_bytes. | |
4110 } | |
4111 | |
4112 // Now make sure the region has the right index in the sorted array. | |
4113 g1_policy()->note_change_in_marked_bytes(cur); | |
4114 } | |
4115 cur = cur->next_in_collection_set(); | |
4116 } | |
4117 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
4118 | |
4119 // Now restore saved marks, if any. | |
4120 if (_objs_with_preserved_marks != NULL) { | |
4121 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
4122 guarantee(_objs_with_preserved_marks->length() == | |
4123 _preserved_marks_of_objs->length(), "Both or none."); | |
4124 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
4125 oop obj = _objs_with_preserved_marks->at(i); | |
4126 markOop m = _preserved_marks_of_objs->at(i); | |
4127 obj->set_mark(m); | |
4128 } | |
4129 // Delete the preserved marks growable arrays (allocated on the C heap). | |
4130 delete _objs_with_preserved_marks; | |
4131 delete _preserved_marks_of_objs; | |
4132 _objs_with_preserved_marks = NULL; | |
4133 _preserved_marks_of_objs = NULL; | |
4134 } | |
4135 } | |
4136 | |
4137 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
4138 _evac_failure_scan_stack->push(obj); | |
4139 } | |
4140 | |
4141 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
4142 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
4143 | |
4144 while (_evac_failure_scan_stack->length() > 0) { | |
4145 oop obj = _evac_failure_scan_stack->pop(); | |
4146 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
4147 obj->oop_iterate_backwards(_evac_failure_closure); | |
4148 } | |
4149 } | |
4150 | |
4151 oop | |
4152 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
4153 oop old) { | |
4154 markOop m = old->mark(); | |
4155 oop forward_ptr = old->forward_to_atomic(old); | |
4156 if (forward_ptr == NULL) { | |
4157 // Forward-to-self succeeded. | |
4158 if (_evac_failure_closure != cl) { | |
4159 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
4160 assert(!_drain_in_progress, | |
4161 "Should only be true while someone holds the lock."); | |
4162 // Set the global evac-failure closure to the current thread's. | |
4163 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
4164 set_evac_failure_closure(cl); | |
4165 // Now do the common part. | |
4166 handle_evacuation_failure_common(old, m); | |
4167 // Reset to NULL. | |
4168 set_evac_failure_closure(NULL); | |
4169 } else { | |
4170 // The lock is already held, and this is recursive. | |
4171 assert(_drain_in_progress, "This should only be the recursive case."); | |
4172 handle_evacuation_failure_common(old, m); | |
4173 } | |
4174 return old; | |
4175 } else { | |
4176 // Someone else had a place to copy it. | |
4177 return forward_ptr; | |
4178 } | |
4179 } | |
4180 | |
4181 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
4182 set_evacuation_failed(true); | |
4183 | |
4184 preserve_mark_if_necessary(old, m); | |
4185 | |
4186 HeapRegion* r = heap_region_containing(old); | |
4187 if (!r->evacuation_failed()) { | |
4188 r->set_evacuation_failed(true); | |
1282 | 4189 if (G1PrintHeapRegions) { |
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4190 gclog_or_tty->print("overflow in heap region "PTR_FORMAT" " |
342 | 4191 "["PTR_FORMAT","PTR_FORMAT")\n", |
4192 r, r->bottom(), r->end()); | |
4193 } | |
4194 } | |
4195 | |
4196 push_on_evac_failure_scan_stack(old); | |
4197 | |
4198 if (!_drain_in_progress) { | |
4199 // prevent recursion in copy_to_survivor_space() | |
4200 _drain_in_progress = true; | |
4201 drain_evac_failure_scan_stack(); | |
4202 _drain_in_progress = false; | |
4203 } | |
4204 } | |
4205 | |
4206 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
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4207 assert(evacuation_failed(), "Oversaving!"); |
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4208 // We want to call the "for_promotion_failure" version only in the |
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4209 // case of a promotion failure. |
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4210 if (m->must_be_preserved_for_promotion_failure(obj)) { |
342 | 4211 if (_objs_with_preserved_marks == NULL) { |
4212 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
4213 _objs_with_preserved_marks = | |
4214 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
4215 _preserved_marks_of_objs = | |
4216 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
4217 } | |
4218 _objs_with_preserved_marks->push(obj); | |
4219 _preserved_marks_of_objs->push(m); | |
4220 } | |
4221 } | |
4222 | |
4223 // *** Parallel G1 Evacuation | |
4224 | |
4225 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
4226 size_t word_size) { | |
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4227 assert(!isHumongous(word_size), |
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4228 err_msg("we should not be seeing humongous allocation requests " |
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4229 "during GC, word_size = "SIZE_FORMAT, word_size)); |
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4230 |
342 | 4231 HeapRegion* alloc_region = _gc_alloc_regions[purpose]; |
4232 // let the caller handle alloc failure | |
4233 if (alloc_region == NULL) return NULL; | |
4234 | |
4235 HeapWord* block = alloc_region->par_allocate(word_size); | |
4236 if (block == NULL) { | |
4237 block = allocate_during_gc_slow(purpose, alloc_region, true, word_size); | |
4238 } | |
4239 return block; | |
4240 } | |
4241 | |
545 | 4242 void G1CollectedHeap::retire_alloc_region(HeapRegion* alloc_region, |
4243 bool par) { | |
4244 // Another thread might have obtained alloc_region for the given | |
4245 // purpose, and might be attempting to allocate in it, and might | |
4246 // succeed. Therefore, we can't do the "finalization" stuff on the | |
4247 // region below until we're sure the last allocation has happened. | |
4248 // We ensure this by allocating the remaining space with a garbage | |
4249 // object. | |
4250 if (par) par_allocate_remaining_space(alloc_region); | |
4251 // Now we can do the post-GC stuff on the region. | |
4252 alloc_region->note_end_of_copying(); | |
4253 g1_policy()->record_after_bytes(alloc_region->used()); | |
4254 } | |
4255 | |
342 | 4256 HeapWord* |
4257 G1CollectedHeap::allocate_during_gc_slow(GCAllocPurpose purpose, | |
4258 HeapRegion* alloc_region, | |
4259 bool par, | |
4260 size_t word_size) { | |
1718
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4261 assert(!isHumongous(word_size), |
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4262 err_msg("we should not be seeing humongous allocation requests " |
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4263 "during GC, word_size = "SIZE_FORMAT, word_size)); |
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4264 |
2152 | 4265 // We need to make sure we serialize calls to this method. Given |
4266 // that the FreeList_lock guards accesses to the free_list anyway, | |
4267 // and we need to potentially remove a region from it, we'll use it | |
4268 // to protect the whole call. | |
4269 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); | |
4270 | |
342 | 4271 HeapWord* block = NULL; |
4272 // In the parallel case, a previous thread to obtain the lock may have | |
4273 // already assigned a new gc_alloc_region. | |
4274 if (alloc_region != _gc_alloc_regions[purpose]) { | |
4275 assert(par, "But should only happen in parallel case."); | |
4276 alloc_region = _gc_alloc_regions[purpose]; | |
4277 if (alloc_region == NULL) return NULL; | |
4278 block = alloc_region->par_allocate(word_size); | |
4279 if (block != NULL) return block; | |
4280 // Otherwise, continue; this new region is empty, too. | |
4281 } | |
4282 assert(alloc_region != NULL, "We better have an allocation region"); | |
545 | 4283 retire_alloc_region(alloc_region, par); |
342 | 4284 |
4285 if (_gc_alloc_region_counts[purpose] >= g1_policy()->max_regions(purpose)) { | |
4286 // Cannot allocate more regions for the given purpose. | |
4287 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(purpose); | |
4288 // Is there an alternative? | |
4289 if (purpose != alt_purpose) { | |
4290 HeapRegion* alt_region = _gc_alloc_regions[alt_purpose]; | |
4291 // Has not the alternative region been aliased? | |
545 | 4292 if (alloc_region != alt_region && alt_region != NULL) { |
342 | 4293 // Try to allocate in the alternative region. |
4294 if (par) { | |
4295 block = alt_region->par_allocate(word_size); | |
4296 } else { | |
4297 block = alt_region->allocate(word_size); | |
4298 } | |
4299 // Make an alias. | |
4300 _gc_alloc_regions[purpose] = _gc_alloc_regions[alt_purpose]; | |
545 | 4301 if (block != NULL) { |
4302 return block; | |
4303 } | |
4304 retire_alloc_region(alt_region, par); | |
342 | 4305 } |
4306 // Both the allocation region and the alternative one are full | |
4307 // and aliased, replace them with a new allocation region. | |
4308 purpose = alt_purpose; | |
4309 } else { | |
4310 set_gc_alloc_region(purpose, NULL); | |
4311 return NULL; | |
4312 } | |
4313 } | |
4314 | |
4315 // Now allocate a new region for allocation. | |
2152 | 4316 alloc_region = new_gc_alloc_region(purpose, word_size); |
342 | 4317 |
4318 // let the caller handle alloc failure | |
4319 if (alloc_region != NULL) { | |
4320 | |
4321 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
4322 assert(alloc_region->saved_mark_at_top(), | |
4323 "Mark should have been saved already."); | |
4324 // This must be done last: once it's installed, other regions may | |
4325 // allocate in it (without holding the lock.) | |
4326 set_gc_alloc_region(purpose, alloc_region); | |
4327 | |
4328 if (par) { | |
4329 block = alloc_region->par_allocate(word_size); | |
4330 } else { | |
4331 block = alloc_region->allocate(word_size); | |
4332 } | |
4333 // Caller handles alloc failure. | |
4334 } else { | |
4335 // This sets other apis using the same old alloc region to NULL, also. | |
4336 set_gc_alloc_region(purpose, NULL); | |
4337 } | |
4338 return block; // May be NULL. | |
4339 } | |
4340 | |
4341 void G1CollectedHeap::par_allocate_remaining_space(HeapRegion* r) { | |
4342 HeapWord* block = NULL; | |
4343 size_t free_words; | |
4344 do { | |
4345 free_words = r->free()/HeapWordSize; | |
4346 // If there's too little space, no one can allocate, so we're done. | |
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4347 if (free_words < CollectedHeap::min_fill_size()) return; |
342 | 4348 // Otherwise, try to claim it. |
4349 block = r->par_allocate(free_words); | |
4350 } while (block == NULL); | |
481
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4351 fill_with_object(block, free_words); |
342 | 4352 } |
4353 | |
4354 #ifndef PRODUCT | |
4355 bool GCLabBitMapClosure::do_bit(size_t offset) { | |
4356 HeapWord* addr = _bitmap->offsetToHeapWord(offset); | |
4357 guarantee(_cm->isMarked(oop(addr)), "it should be!"); | |
4358 return true; | |
4359 } | |
4360 #endif // PRODUCT | |
4361 | |
845
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4362 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) |
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4363 : _g1h(g1h), |
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4364 _refs(g1h->task_queue(queue_num)), |
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4365 _dcq(&g1h->dirty_card_queue_set()), |
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4366 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
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4367 _g1_rem(g1h->g1_rem_set()), |
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4368 _hash_seed(17), _queue_num(queue_num), |
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4369 _term_attempts(0), |
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4370 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
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4371 _tenured_alloc_buffer(g1h->desired_plab_sz(GCAllocForTenured)), |
845
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4372 _age_table(false), |
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4373 _strong_roots_time(0), _term_time(0), |
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4374 _alloc_buffer_waste(0), _undo_waste(0) |
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4375 { |
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4376 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
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4377 // we "sacrifice" entry 0 to keep track of surviving bytes for |
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4378 // non-young regions (where the age is -1) |
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4379 // We also add a few elements at the beginning and at the end in |
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4380 // an attempt to eliminate cache contention |
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4381 size_t real_length = 1 + _g1h->g1_policy()->young_cset_length(); |
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4382 size_t array_length = PADDING_ELEM_NUM + |
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4383 real_length + |
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4384 PADDING_ELEM_NUM; |
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4385 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); |
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4386 if (_surviving_young_words_base == NULL) |
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4387 vm_exit_out_of_memory(array_length * sizeof(size_t), |
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4388 "Not enough space for young surv histo."); |
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4389 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; |
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4390 memset(_surviving_young_words, 0, real_length * sizeof(size_t)); |
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4391 |
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4392 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
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4393 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
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4394 |
845
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4395 _start = os::elapsedTime(); |
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4396 } |
342 | 4397 |
1709 | 4398 void |
4399 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
4400 { | |
4401 st->print_raw_cr("GC Termination Stats"); | |
4402 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
4403 " ------waste (KiB)------"); | |
4404 st->print_raw_cr("thr ms ms % ms % attempts" | |
4405 " total alloc undo"); | |
4406 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
4407 " ------- ------- -------"); | |
4408 } | |
4409 | |
4410 void | |
4411 G1ParScanThreadState::print_termination_stats(int i, | |
4412 outputStream* const st) const | |
4413 { | |
4414 const double elapsed_ms = elapsed_time() * 1000.0; | |
4415 const double s_roots_ms = strong_roots_time() * 1000.0; | |
4416 const double term_ms = term_time() * 1000.0; | |
4417 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
4418 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
4419 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
4420 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
4421 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
4422 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
4423 alloc_buffer_waste() * HeapWordSize / K, | |
4424 undo_waste() * HeapWordSize / K); | |
4425 } | |
4426 | |
1862
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4427 #ifdef ASSERT |
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4428 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { |
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4429 assert(ref != NULL, "invariant"); |
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4430 assert(UseCompressedOops, "sanity"); |
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4431 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
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4432 oop p = oopDesc::load_decode_heap_oop(ref); |
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4433 assert(_g1h->is_in_g1_reserved(p), |
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4434 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
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4435 return true; |
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|
4436 } |
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4437 |
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4438 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
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4439 assert(ref != NULL, "invariant"); |
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4440 if (has_partial_array_mask(ref)) { |
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4441 // Must be in the collection set--it's already been copied. |
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4442 oop p = clear_partial_array_mask(ref); |
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4443 assert(_g1h->obj_in_cs(p), |
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4444 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
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4445 } else { |
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4446 oop p = oopDesc::load_decode_heap_oop(ref); |
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4447 assert(_g1h->is_in_g1_reserved(p), |
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4448 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
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4449 } |
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|
4450 return true; |
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|
4451 } |
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|
4452 |
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4453 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
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6989448: G1: refactor and simplify G1ParScanThreadState
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4454 if (ref.is_narrow()) { |
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4455 return verify_ref((narrowOop*) ref); |
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4456 } else { |
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4457 return verify_ref((oop*) ref); |
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|
4458 } |
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|
4459 } |
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|
4460 #endif // ASSERT |
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|
4461 |
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4462 void G1ParScanThreadState::trim_queue() { |
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4463 StarTask ref; |
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|
4464 do { |
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|
4465 // Drain the overflow stack first, so other threads can steal. |
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4466 while (refs()->pop_overflow(ref)) { |
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|
4467 deal_with_reference(ref); |
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|
4468 } |
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|
4469 while (refs()->pop_local(ref)) { |
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|
4470 deal_with_reference(ref); |
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|
4471 } |
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4472 } while (!refs()->is_empty()); |
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4473 } |
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4474 |
342 | 4475 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : |
4476 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), | |
4477 _par_scan_state(par_scan_state) { } | |
4478 | |
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4479 template <class T> void G1ParCopyHelper::mark_forwardee(T* p) { |
342 | 4480 // This is called _after_ do_oop_work has been called, hence after |
4481 // the object has been relocated to its new location and *p points | |
4482 // to its new location. | |
4483 | |
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4484 T heap_oop = oopDesc::load_heap_oop(p); |
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4485 if (!oopDesc::is_null(heap_oop)) { |
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4486 oop obj = oopDesc::decode_heap_oop(heap_oop); |
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4487 assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj)), |
342 | 4488 "shouldn't still be in the CSet if evacuation didn't fail."); |
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4489 HeapWord* addr = (HeapWord*)obj; |
342 | 4490 if (_g1->is_in_g1_reserved(addr)) |
4491 _cm->grayRoot(oop(addr)); | |
4492 } | |
4493 } | |
4494 | |
4495 oop G1ParCopyHelper::copy_to_survivor_space(oop old) { | |
4496 size_t word_sz = old->size(); | |
4497 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
4498 // +1 to make the -1 indexes valid... | |
4499 int young_index = from_region->young_index_in_cset()+1; | |
4500 assert( (from_region->is_young() && young_index > 0) || | |
4501 (!from_region->is_young() && young_index == 0), "invariant" ); | |
4502 G1CollectorPolicy* g1p = _g1->g1_policy(); | |
4503 markOop m = old->mark(); | |
545 | 4504 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
4505 : m->age(); | |
4506 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
342 | 4507 word_sz); |
4508 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
4509 oop obj = oop(obj_ptr); | |
4510 | |
4511 if (obj_ptr == NULL) { | |
4512 // This will either forward-to-self, or detect that someone else has | |
4513 // installed a forwarding pointer. | |
4514 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
4515 return _g1->handle_evacuation_failure_par(cl, old); | |
4516 } | |
4517 | |
526 | 4518 // We're going to allocate linearly, so might as well prefetch ahead. |
4519 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
4520 | |
342 | 4521 oop forward_ptr = old->forward_to_atomic(obj); |
4522 if (forward_ptr == NULL) { | |
4523 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
526 | 4524 if (g1p->track_object_age(alloc_purpose)) { |
4525 // We could simply do obj->incr_age(). However, this causes a | |
4526 // performance issue. obj->incr_age() will first check whether | |
4527 // the object has a displaced mark by checking its mark word; | |
4528 // getting the mark word from the new location of the object | |
4529 // stalls. So, given that we already have the mark word and we | |
4530 // are about to install it anyway, it's better to increase the | |
4531 // age on the mark word, when the object does not have a | |
4532 // displaced mark word. We're not expecting many objects to have | |
4533 // a displaced marked word, so that case is not optimized | |
4534 // further (it could be...) and we simply call obj->incr_age(). | |
4535 | |
4536 if (m->has_displaced_mark_helper()) { | |
4537 // in this case, we have to install the mark word first, | |
4538 // otherwise obj looks to be forwarded (the old mark word, | |
4539 // which contains the forward pointer, was copied) | |
4540 obj->set_mark(m); | |
4541 obj->incr_age(); | |
4542 } else { | |
4543 m = m->incr_age(); | |
545 | 4544 obj->set_mark(m); |
526 | 4545 } |
545 | 4546 _par_scan_state->age_table()->add(obj, word_sz); |
4547 } else { | |
4548 obj->set_mark(m); | |
526 | 4549 } |
4550 | |
342 | 4551 // preserve "next" mark bit |
4552 if (_g1->mark_in_progress() && !_g1->is_obj_ill(old)) { | |
4553 if (!use_local_bitmaps || | |
4554 !_par_scan_state->alloc_buffer(alloc_purpose)->mark(obj_ptr)) { | |
4555 // if we couldn't mark it on the local bitmap (this happens when | |
4556 // the object was not allocated in the GCLab), we have to bite | |
4557 // the bullet and do the standard parallel mark | |
4558 _cm->markAndGrayObjectIfNecessary(obj); | |
4559 } | |
4560 #if 1 | |
4561 if (_g1->isMarkedNext(old)) { | |
4562 _cm->nextMarkBitMap()->parClear((HeapWord*)old); | |
4563 } | |
4564 #endif | |
4565 } | |
4566 | |
4567 size_t* surv_young_words = _par_scan_state->surviving_young_words(); | |
4568 surv_young_words[young_index] += word_sz; | |
4569 | |
4570 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
4571 arrayOop(old)->set_length(0); | |
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4572 oop* old_p = set_partial_array_mask(old); |
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4573 _par_scan_state->push_on_queue(old_p); |
342 | 4574 } else { |
526 | 4575 // No point in using the slower heap_region_containing() method, |
4576 // given that we know obj is in the heap. | |
4577 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
342 | 4578 obj->oop_iterate_backwards(_scanner); |
4579 } | |
4580 } else { | |
4581 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
4582 obj = forward_ptr; | |
4583 } | |
4584 return obj; | |
4585 } | |
4586 | |
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4587 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_forwardee> |
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4588 template <class T> |
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4589 void G1ParCopyClosure <do_gen_barrier, barrier, do_mark_forwardee> |
845
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4590 ::do_oop_work(T* p) { |
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4591 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 4592 assert(barrier != G1BarrierRS || obj != NULL, |
4593 "Precondition: G1BarrierRS implies obj is nonNull"); | |
4594 | |
526 | 4595 // here the null check is implicit in the cset_fast_test() test |
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4596 if (_g1->in_cset_fast_test(obj)) { |
342 | 4597 #if G1_REM_SET_LOGGING |
526 | 4598 gclog_or_tty->print_cr("Loc "PTR_FORMAT" contains pointer "PTR_FORMAT" " |
4599 "into CS.", p, (void*) obj); | |
342 | 4600 #endif |
526 | 4601 if (obj->is_forwarded()) { |
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4602 oopDesc::encode_store_heap_oop(p, obj->forwardee()); |
526 | 4603 } else { |
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4604 oop copy_oop = copy_to_survivor_space(obj); |
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4605 oopDesc::encode_store_heap_oop(p, copy_oop); |
342 | 4606 } |
526 | 4607 // When scanning the RS, we only care about objs in CS. |
4608 if (barrier == G1BarrierRS) { | |
616
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4609 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
342 | 4610 } |
526 | 4611 } |
4612 | |
4613 if (barrier == G1BarrierEvac && obj != NULL) { | |
616
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4614 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
526 | 4615 } |
4616 | |
4617 if (do_gen_barrier && obj != NULL) { | |
4618 par_do_barrier(p); | |
4619 } | |
4620 } | |
4621 | |
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4622 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
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4623 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
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4624 |
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4625 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
526 | 4626 assert(has_partial_array_mask(p), "invariant"); |
4627 oop old = clear_partial_array_mask(p); | |
342 | 4628 assert(old->is_objArray(), "must be obj array"); |
4629 assert(old->is_forwarded(), "must be forwarded"); | |
4630 assert(Universe::heap()->is_in_reserved(old), "must be in heap."); | |
4631 | |
4632 objArrayOop obj = objArrayOop(old->forwardee()); | |
4633 assert((void*)old != (void*)old->forwardee(), "self forwarding here?"); | |
4634 // Process ParGCArrayScanChunk elements now | |
4635 // and push the remainder back onto queue | |
4636 int start = arrayOop(old)->length(); | |
4637 int end = obj->length(); | |
4638 int remainder = end - start; | |
4639 assert(start <= end, "just checking"); | |
4640 if (remainder > 2 * ParGCArrayScanChunk) { | |
4641 // Test above combines last partial chunk with a full chunk | |
4642 end = start + ParGCArrayScanChunk; | |
4643 arrayOop(old)->set_length(end); | |
4644 // Push remainder. | |
845
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4645 oop* old_p = set_partial_array_mask(old); |
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4646 assert(arrayOop(old)->length() < obj->length(), "Empty push?"); |
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4647 _par_scan_state->push_on_queue(old_p); |
342 | 4648 } else { |
4649 // Restore length so that the heap remains parsable in | |
4650 // case of evacuation failure. | |
4651 arrayOop(old)->set_length(end); | |
4652 } | |
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4653 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
342 | 4654 // process our set of indices (include header in first chunk) |
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4655 obj->oop_iterate_range(&_scanner, start, end); |
342 | 4656 } |
4657 | |
4658 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
4659 protected: | |
4660 G1CollectedHeap* _g1h; | |
4661 G1ParScanThreadState* _par_scan_state; | |
4662 RefToScanQueueSet* _queues; | |
4663 ParallelTaskTerminator* _terminator; | |
4664 | |
4665 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
4666 RefToScanQueueSet* queues() { return _queues; } | |
4667 ParallelTaskTerminator* terminator() { return _terminator; } | |
4668 | |
4669 public: | |
4670 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
4671 G1ParScanThreadState* par_scan_state, | |
4672 RefToScanQueueSet* queues, | |
4673 ParallelTaskTerminator* terminator) | |
4674 : _g1h(g1h), _par_scan_state(par_scan_state), | |
4675 _queues(queues), _terminator(terminator) {} | |
4676 | |
1862
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4677 void do_void(); |
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4678 |
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4679 private: |
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4680 inline bool offer_termination(); |
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4681 }; |
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4682 |
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4683 bool G1ParEvacuateFollowersClosure::offer_termination() { |
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4684 G1ParScanThreadState* const pss = par_scan_state(); |
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4685 pss->start_term_time(); |
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4686 const bool res = terminator()->offer_termination(); |
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4687 pss->end_term_time(); |
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4688 return res; |
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4689 } |
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4690 |
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4691 void G1ParEvacuateFollowersClosure::do_void() { |
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4692 StarTask stolen_task; |
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4693 G1ParScanThreadState* const pss = par_scan_state(); |
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4694 pss->trim_queue(); |
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4695 |
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4696 do { |
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4697 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
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4698 assert(pss->verify_task(stolen_task), "sanity"); |
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4699 if (stolen_task.is_narrow()) { |
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4700 pss->deal_with_reference((narrowOop*) stolen_task); |
1862
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4701 } else { |
1883
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4702 pss->deal_with_reference((oop*) stolen_task); |
1862
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4703 } |
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4704 |
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4705 // We've just processed a reference and we might have made |
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4706 // available new entries on the queues. So we have to make sure |
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4707 // we drain the queues as necessary. |
342 | 4708 pss->trim_queue(); |
4709 } | |
1862
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4710 } while (!offer_termination()); |
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4711 |
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4712 pss->retire_alloc_buffers(); |
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4713 } |
342 | 4714 |
4715 class G1ParTask : public AbstractGangTask { | |
4716 protected: | |
4717 G1CollectedHeap* _g1h; | |
4718 RefToScanQueueSet *_queues; | |
4719 ParallelTaskTerminator _terminator; | |
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4720 int _n_workers; |
342 | 4721 |
4722 Mutex _stats_lock; | |
4723 Mutex* stats_lock() { return &_stats_lock; } | |
4724 | |
4725 size_t getNCards() { | |
4726 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
4727 / G1BlockOffsetSharedArray::N_bytes; | |
4728 } | |
4729 | |
4730 public: | |
4731 G1ParTask(G1CollectedHeap* g1h, int workers, RefToScanQueueSet *task_queues) | |
4732 : AbstractGangTask("G1 collection"), | |
4733 _g1h(g1h), | |
4734 _queues(task_queues), | |
4735 _terminator(workers, _queues), | |
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4736 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true), |
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4737 _n_workers(workers) |
342 | 4738 {} |
4739 | |
4740 RefToScanQueueSet* queues() { return _queues; } | |
4741 | |
4742 RefToScanQueue *work_queue(int i) { | |
4743 return queues()->queue(i); | |
4744 } | |
4745 | |
4746 void work(int i) { | |
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diff
changeset
|
4747 if (i >= _n_workers) return; // no work needed this round |
1611 | 4748 |
4749 double start_time_ms = os::elapsedTime() * 1000.0; | |
4750 _g1h->g1_policy()->record_gc_worker_start_time(i, start_time_ms); | |
4751 | |
342 | 4752 ResourceMark rm; |
4753 HandleMark hm; | |
4754 | |
526 | 4755 G1ParScanThreadState pss(_g1h, i); |
4756 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss); | |
4757 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss); | |
4758 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss); | |
342 | 4759 |
4760 pss.set_evac_closure(&scan_evac_cl); | |
4761 pss.set_evac_failure_closure(&evac_failure_cl); | |
4762 pss.set_partial_scan_closure(&partial_scan_cl); | |
4763 | |
4764 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss); | |
4765 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss); | |
4766 G1ParScanHeapRSClosure only_scan_heap_rs_cl(_g1h, &pss); | |
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4767 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
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4768 |
342 | 4769 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss); |
4770 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss); | |
4771 G1ParScanAndMarkHeapRSClosure scan_mark_heap_rs_cl(_g1h, &pss); | |
4772 | |
4773 OopsInHeapRegionClosure *scan_root_cl; | |
4774 OopsInHeapRegionClosure *scan_perm_cl; | |
4775 | |
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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4776 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
342 | 4777 scan_root_cl = &scan_mark_root_cl; |
4778 scan_perm_cl = &scan_mark_perm_cl; | |
4779 } else { | |
4780 scan_root_cl = &only_scan_root_cl; | |
4781 scan_perm_cl = &only_scan_perm_cl; | |
4782 } | |
4783 | |
4784 pss.start_strong_roots(); | |
4785 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
4786 SharedHeap::SO_AllClasses, | |
4787 scan_root_cl, | |
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|
4788 &push_heap_rs_cl, |
342 | 4789 scan_perm_cl, |
4790 i); | |
4791 pss.end_strong_roots(); | |
4792 { | |
4793 double start = os::elapsedTime(); | |
4794 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
4795 evac.do_void(); | |
4796 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
4797 double term_ms = pss.term_time()*1000.0; | |
4798 _g1h->g1_policy()->record_obj_copy_time(i, elapsed_ms-term_ms); | |
1611 | 4799 _g1h->g1_policy()->record_termination(i, term_ms, pss.term_attempts()); |
342 | 4800 } |
1282 | 4801 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
342 | 4802 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
4803 | |
4804 // Clean up any par-expanded rem sets. | |
4805 HeapRegionRemSet::par_cleanup(); | |
4806 | |
4807 if (ParallelGCVerbose) { | |
1709 | 4808 MutexLocker x(stats_lock()); |
4809 pss.print_termination_stats(i); | |
342 | 4810 } |
4811 | |
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6989448: G1: refactor and simplify G1ParScanThreadState
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parents:
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diff
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|
4812 assert(pss.refs()->is_empty(), "should be empty"); |
1611 | 4813 double end_time_ms = os::elapsedTime() * 1000.0; |
4814 _g1h->g1_policy()->record_gc_worker_end_time(i, end_time_ms); | |
342 | 4815 } |
4816 }; | |
4817 | |
4818 // *** Common G1 Evacuation Stuff | |
4819 | |
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4820 // This method is run in a GC worker. |
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4821 |
342 | 4822 void |
4823 G1CollectedHeap:: | |
4824 g1_process_strong_roots(bool collecting_perm_gen, | |
4825 SharedHeap::ScanningOption so, | |
4826 OopClosure* scan_non_heap_roots, | |
4827 OopsInHeapRegionClosure* scan_rs, | |
4828 OopsInGenClosure* scan_perm, | |
4829 int worker_i) { | |
4830 // First scan the strong roots, including the perm gen. | |
4831 double ext_roots_start = os::elapsedTime(); | |
4832 double closure_app_time_sec = 0.0; | |
4833 | |
4834 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
4835 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
4836 buf_scan_perm.set_generation(perm_gen()); | |
4837 | |
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6863023: need non-perm oops in code cache for JSR 292
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diff
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|
4838 // Walk the code cache w/o buffering, because StarTask cannot handle |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
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diff
changeset
|
4839 // unaligned oop locations. |
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6863023: need non-perm oops in code cache for JSR 292
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diff
changeset
|
4840 CodeBlobToOopClosure eager_scan_code_roots(scan_non_heap_roots, /*do_marking=*/ true); |
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6863023: need non-perm oops in code cache for JSR 292
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|
4841 |
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diff
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|
4842 process_strong_roots(false, // no scoping; this is parallel code |
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diff
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|
4843 collecting_perm_gen, so, |
342 | 4844 &buf_scan_non_heap_roots, |
989
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diff
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|
4845 &eager_scan_code_roots, |
342 | 4846 &buf_scan_perm); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
4847 |
342 | 4848 // Finish up any enqueued closure apps. |
4849 buf_scan_non_heap_roots.done(); | |
4850 buf_scan_perm.done(); | |
4851 double ext_roots_end = os::elapsedTime(); | |
4852 g1_policy()->reset_obj_copy_time(worker_i); | |
4853 double obj_copy_time_sec = | |
4854 buf_scan_non_heap_roots.closure_app_seconds() + | |
4855 buf_scan_perm.closure_app_seconds(); | |
4856 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); | |
4857 double ext_root_time_ms = | |
4858 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
4859 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); | |
4860 | |
4861 // Scan strong roots in mark stack. | |
4862 if (!_process_strong_tasks->is_task_claimed(G1H_PS_mark_stack_oops_do)) { | |
4863 concurrent_mark()->oops_do(scan_non_heap_roots); | |
4864 } | |
4865 double mark_stack_scan_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; | |
4866 g1_policy()->record_mark_stack_scan_time(worker_i, mark_stack_scan_ms); | |
4867 | |
4868 // XXX What should this be doing in the parallel case? | |
4869 g1_policy()->record_collection_pause_end_CH_strong_roots(); | |
4870 // Now scan the complement of the collection set. | |
4871 if (scan_rs != NULL) { | |
4872 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
4873 } | |
4874 // Finish with the ref_processor roots. | |
4875 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { | |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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1973
diff
changeset
|
4876 // We need to treat the discovered reference lists as roots and |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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diff
changeset
|
4877 // keep entries (which are added by the marking threads) on them |
fd1d227ef1b9
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diff
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|
4878 // live until they can be processed at the end of marking. |
fd1d227ef1b9
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diff
changeset
|
4879 ref_processor()->weak_oops_do(scan_non_heap_roots); |
342 | 4880 ref_processor()->oops_do(scan_non_heap_roots); |
4881 } | |
4882 g1_policy()->record_collection_pause_end_G1_strong_roots(); | |
4883 _process_strong_tasks->all_tasks_completed(); | |
4884 } | |
4885 | |
4886 void | |
4887 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
4888 OopClosure* non_root_closure) { | |
989
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890
diff
changeset
|
4889 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
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diff
changeset
|
4890 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
342 | 4891 } |
4892 | |
4893 | |
4894 class SaveMarksClosure: public HeapRegionClosure { | |
4895 public: | |
4896 bool doHeapRegion(HeapRegion* r) { | |
4897 r->save_marks(); | |
4898 return false; | |
4899 } | |
4900 }; | |
4901 | |
4902 void G1CollectedHeap::save_marks() { | |
1833
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6984287: Regularize how GC parallel workers are specified.
jmasa
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1755
diff
changeset
|
4903 if (!CollectedHeap::use_parallel_gc_threads()) { |
342 | 4904 SaveMarksClosure sm; |
4905 heap_region_iterate(&sm); | |
4906 } | |
4907 // We do this even in the parallel case | |
4908 perm_gen()->save_marks(); | |
4909 } | |
4910 | |
4911 void G1CollectedHeap::evacuate_collection_set() { | |
4912 set_evacuation_failed(false); | |
4913 | |
4914 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
4915 concurrent_g1_refine()->set_use_cache(false); | |
889 | 4916 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
4917 | |
342 | 4918 int n_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); |
4919 set_par_threads(n_workers); | |
4920 G1ParTask g1_par_task(this, n_workers, _task_queues); | |
4921 | |
4922 init_for_evac_failure(NULL); | |
4923 | |
4924 rem_set()->prepare_for_younger_refs_iterate(true); | |
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
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|
4925 |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
changeset
|
4926 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
342 | 4927 double start_par = os::elapsedTime(); |
1833
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6984287: Regularize how GC parallel workers are specified.
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diff
changeset
|
4928 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 4929 // The individual threads will set their evac-failure closures. |
989
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diff
changeset
|
4930 StrongRootsScope srs(this); |
1709 | 4931 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
342 | 4932 workers()->run_task(&g1_par_task); |
4933 } else { | |
989
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diff
changeset
|
4934 StrongRootsScope srs(this); |
342 | 4935 g1_par_task.work(0); |
4936 } | |
4937 | |
4938 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
4939 g1_policy()->record_par_time(par_time); | |
4940 set_par_threads(0); | |
4941 // Is this the right thing to do here? We don't save marks | |
4942 // on individual heap regions when we allocate from | |
4943 // them in parallel, so this seems like the correct place for this. | |
545 | 4944 retire_all_alloc_regions(); |
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diff
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|
4945 |
fd1d227ef1b9
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diff
changeset
|
4946 // Weak root processing. |
fd1d227ef1b9
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1973
diff
changeset
|
4947 // Note: when JSR 292 is enabled and code blobs can contain |
fd1d227ef1b9
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diff
changeset
|
4948 // non-perm oops then we will need to process the code blobs |
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diff
changeset
|
4949 // here too. |
342 | 4950 { |
4951 G1IsAliveClosure is_alive(this); | |
4952 G1KeepAliveClosure keep_alive(this); | |
4953 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
4954 } | |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
4955 release_gc_alloc_regions(false /* totally */); |
342 | 4956 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); |
616
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diff
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|
4957 |
889 | 4958 concurrent_g1_refine()->clear_hot_cache(); |
342 | 4959 concurrent_g1_refine()->set_use_cache(true); |
4960 | |
4961 finalize_for_evac_failure(); | |
4962 | |
4963 // Must do this before removing self-forwarding pointers, which clears | |
4964 // the per-region evac-failure flags. | |
4965 concurrent_mark()->complete_marking_in_collection_set(); | |
4966 | |
4967 if (evacuation_failed()) { | |
4968 remove_self_forwarding_pointers(); | |
4969 if (PrintGCDetails) { | |
1719
b63010841f78
6975964: G1: print out a more descriptive message for evacuation failure when +PrintGCDetails is set
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parents:
1718
diff
changeset
|
4970 gclog_or_tty->print(" (to-space overflow)"); |
342 | 4971 } else if (PrintGC) { |
4972 gclog_or_tty->print("--"); | |
4973 } | |
4974 } | |
4975 | |
616
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diff
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|
4976 if (G1DeferredRSUpdate) { |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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595
diff
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|
4977 RedirtyLoggedCardTableEntryFastClosure redirty; |
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6720309: G1: don't synchronously update RSet during evacuation pauses
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|
4978 dirty_card_queue_set().set_closure(&redirty); |
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|
4979 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
1111 | 4980 |
4981 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
4982 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
616
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4983 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
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4984 } |
342 | 4985 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
4986 } | |
4987 | |
2173 | 4988 void G1CollectedHeap::free_region_if_empty(HeapRegion* hr, |
2152 | 4989 size_t* pre_used, |
4990 FreeRegionList* free_list, | |
4991 HumongousRegionSet* humongous_proxy_set, | |
2173 | 4992 HRRSCleanupTask* hrrs_cleanup_task, |
2152 | 4993 bool par) { |
4994 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { | |
4995 if (hr->isHumongous()) { | |
4996 assert(hr->startsHumongous(), "we should only see starts humongous"); | |
4997 free_humongous_region(hr, pre_used, free_list, humongous_proxy_set, par); | |
4998 } else { | |
4999 free_region(hr, pre_used, free_list, par); | |
342 | 5000 } |
2173 | 5001 } else { |
5002 hr->rem_set()->do_cleanup_work(hrrs_cleanup_task); | |
342 | 5003 } |
5004 } | |
5005 | |
2152 | 5006 void G1CollectedHeap::free_region(HeapRegion* hr, |
5007 size_t* pre_used, | |
5008 FreeRegionList* free_list, | |
5009 bool par) { | |
5010 assert(!hr->isHumongous(), "this is only for non-humongous regions"); | |
5011 assert(!hr->is_empty(), "the region should not be empty"); | |
5012 assert(free_list != NULL, "pre-condition"); | |
5013 | |
5014 *pre_used += hr->used(); | |
5015 hr->hr_clear(par, true /* clear_space */); | |
5016 free_list->add_as_tail(hr); | |
5017 } | |
5018 | |
5019 void G1CollectedHeap::free_humongous_region(HeapRegion* hr, | |
5020 size_t* pre_used, | |
5021 FreeRegionList* free_list, | |
5022 HumongousRegionSet* humongous_proxy_set, | |
5023 bool par) { | |
5024 assert(hr->startsHumongous(), "this is only for starts humongous regions"); | |
5025 assert(free_list != NULL, "pre-condition"); | |
5026 assert(humongous_proxy_set != NULL, "pre-condition"); | |
5027 | |
5028 size_t hr_used = hr->used(); | |
5029 size_t hr_capacity = hr->capacity(); | |
5030 size_t hr_pre_used = 0; | |
5031 _humongous_set.remove_with_proxy(hr, humongous_proxy_set); | |
5032 hr->set_notHumongous(); | |
5033 free_region(hr, &hr_pre_used, free_list, par); | |
5034 | |
5035 int i = hr->hrs_index() + 1; | |
5036 size_t num = 1; | |
5037 while ((size_t) i < n_regions()) { | |
5038 HeapRegion* curr_hr = _hrs->at(i); | |
5039 if (!curr_hr->continuesHumongous()) { | |
5040 break; | |
5041 } | |
5042 curr_hr->set_notHumongous(); | |
5043 free_region(curr_hr, &hr_pre_used, free_list, par); | |
5044 num += 1; | |
5045 i += 1; | |
5046 } | |
5047 assert(hr_pre_used == hr_used, | |
5048 err_msg("hr_pre_used: "SIZE_FORMAT" and hr_used: "SIZE_FORMAT" " | |
5049 "should be the same", hr_pre_used, hr_used)); | |
5050 *pre_used += hr_pre_used; | |
5051 } | |
5052 | |
5053 void G1CollectedHeap::update_sets_after_freeing_regions(size_t pre_used, | |
5054 FreeRegionList* free_list, | |
5055 HumongousRegionSet* humongous_proxy_set, | |
5056 bool par) { | |
5057 if (pre_used > 0) { | |
5058 Mutex* lock = (par) ? ParGCRareEvent_lock : NULL; | |
342 | 5059 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); |
2152 | 5060 assert(_summary_bytes_used >= pre_used, |
5061 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" " | |
5062 "should be >= pre_used: "SIZE_FORMAT, | |
5063 _summary_bytes_used, pre_used)); | |
342 | 5064 _summary_bytes_used -= pre_used; |
2152 | 5065 } |
5066 if (free_list != NULL && !free_list->is_empty()) { | |
5067 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); | |
5068 _free_list.add_as_tail(free_list); | |
5069 } | |
5070 if (humongous_proxy_set != NULL && !humongous_proxy_set->is_empty()) { | |
5071 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
5072 _humongous_set.update_from_proxy(humongous_proxy_set); | |
342 | 5073 } |
5074 } | |
5075 | |
5076 void G1CollectedHeap::dirtyCardsForYoungRegions(CardTableModRefBS* ct_bs, HeapRegion* list) { | |
5077 while (list != NULL) { | |
5078 guarantee( list->is_young(), "invariant" ); | |
5079 | |
5080 HeapWord* bottom = list->bottom(); | |
5081 HeapWord* end = list->end(); | |
5082 MemRegion mr(bottom, end); | |
5083 ct_bs->dirty(mr); | |
5084 | |
5085 list = list->get_next_young_region(); | |
5086 } | |
5087 } | |
5088 | |
796
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5089 |
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5090 class G1ParCleanupCTTask : public AbstractGangTask { |
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5091 CardTableModRefBS* _ct_bs; |
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5092 G1CollectedHeap* _g1h; |
940
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5093 HeapRegion* volatile _su_head; |
796
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|
5094 public: |
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5095 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
940
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5096 G1CollectedHeap* g1h, |
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5097 HeapRegion* survivor_list) : |
796
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5098 AbstractGangTask("G1 Par Cleanup CT Task"), |
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5099 _ct_bs(ct_bs), |
940
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5100 _g1h(g1h), |
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5101 _su_head(survivor_list) |
796
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5102 { } |
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5103 |
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5104 void work(int i) { |
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5105 HeapRegion* r; |
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5106 while (r = _g1h->pop_dirty_cards_region()) { |
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5107 clear_cards(r); |
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|
5108 } |
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5109 // Redirty the cards of the survivor regions. |
940
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|
5110 dirty_list(&this->_su_head); |
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|
5111 } |
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5112 |
796
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5113 void clear_cards(HeapRegion* r) { |
1394
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5114 // Cards for Survivor regions will be dirtied later. |
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5115 if (!r->is_survivor()) { |
796
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5116 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
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5117 } |
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|
5118 } |
940
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5119 |
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5120 void dirty_list(HeapRegion* volatile * head_ptr) { |
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5121 HeapRegion* head; |
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5122 do { |
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5123 // Pop region off the list. |
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5124 head = *head_ptr; |
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5125 if (head != NULL) { |
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|
5126 HeapRegion* r = (HeapRegion*) |
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5127 Atomic::cmpxchg_ptr(head->get_next_young_region(), head_ptr, head); |
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5128 if (r == head) { |
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5129 assert(!r->isHumongous(), "Humongous regions shouldn't be on survivor list"); |
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5130 _ct_bs->dirty(MemRegion(r->bottom(), r->end())); |
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5131 } |
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|
5132 } |
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5133 } while (*head_ptr != NULL); |
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5134 } |
796
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|
5135 }; |
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5136 |
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5137 |
940
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5138 #ifndef PRODUCT |
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5139 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
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5140 CardTableModRefBS* _ct_bs; |
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5141 public: |
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|
5142 G1VerifyCardTableCleanup(CardTableModRefBS* ct_bs) |
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5143 : _ct_bs(ct_bs) |
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5144 { } |
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5145 virtual bool doHeapRegion(HeapRegion* r) |
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5146 { |
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5147 MemRegion mr(r->bottom(), r->end()); |
1394
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5148 if (r->is_survivor()) { |
940
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5149 _ct_bs->verify_dirty_region(mr); |
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5150 } else { |
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5151 _ct_bs->verify_clean_region(mr); |
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|
5152 } |
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|
5153 return false; |
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|
5154 } |
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|
5155 }; |
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|
5156 #endif |
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5157 |
342 | 5158 void G1CollectedHeap::cleanUpCardTable() { |
5159 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
5160 double start = os::elapsedTime(); | |
5161 | |
796
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5162 // Iterate over the dirty cards region list. |
940
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5163 G1ParCleanupCTTask cleanup_task(ct_bs, this, |
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5164 _young_list->first_survivor_region()); |
1394
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5165 |
796
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5166 if (ParallelGCThreads > 0) { |
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5167 set_par_threads(workers()->total_workers()); |
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|
5168 workers()->run_task(&cleanup_task); |
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|
5169 set_par_threads(0); |
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|
5170 } else { |
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5171 while (_dirty_cards_region_list) { |
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|
5172 HeapRegion* r = _dirty_cards_region_list; |
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|
5173 cleanup_task.clear_cards(r); |
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5174 _dirty_cards_region_list = r->get_next_dirty_cards_region(); |
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|
5175 if (_dirty_cards_region_list == r) { |
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|
5176 // The last region. |
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5177 _dirty_cards_region_list = NULL; |
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|
5178 } |
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|
5179 r->set_next_dirty_cards_region(NULL); |
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|
5180 } |
1394
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5181 // now, redirty the cards of the survivor regions |
940
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5182 // (it seemed faster to do it this way, instead of iterating over |
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5183 // all regions and then clearing / dirtying as appropriate) |
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5184 dirtyCardsForYoungRegions(ct_bs, _young_list->first_survivor_region()); |
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5185 } |
1394
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5186 |
342 | 5187 double elapsed = os::elapsedTime() - start; |
5188 g1_policy()->record_clear_ct_time( elapsed * 1000.0); | |
940
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5189 #ifndef PRODUCT |
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|
5190 if (G1VerifyCTCleanup || VerifyAfterGC) { |
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5191 G1VerifyCardTableCleanup cleanup_verifier(ct_bs); |
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|
5192 heap_region_iterate(&cleanup_verifier); |
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|
5193 } |
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|
5194 #endif |
342 | 5195 } |
5196 | |
5197 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
2152 | 5198 size_t pre_used = 0; |
5199 FreeRegionList local_free_list("Local List for CSet Freeing"); | |
5200 | |
342 | 5201 double young_time_ms = 0.0; |
5202 double non_young_time_ms = 0.0; | |
5203 | |
1394
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5204 // Since the collection set is a superset of the the young list, |
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|
5205 // all we need to do to clear the young list is clear its |
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5206 // head and length, and unlink any young regions in the code below |
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|
5207 _young_list->clear(); |
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|
5208 |
342 | 5209 G1CollectorPolicy* policy = g1_policy(); |
5210 | |
5211 double start_sec = os::elapsedTime(); | |
5212 bool non_young = true; | |
5213 | |
5214 HeapRegion* cur = cs_head; | |
5215 int age_bound = -1; | |
5216 size_t rs_lengths = 0; | |
5217 | |
5218 while (cur != NULL) { | |
2361 | 5219 assert(!is_on_master_free_list(cur), "sanity"); |
2152 | 5220 |
342 | 5221 if (non_young) { |
5222 if (cur->is_young()) { | |
5223 double end_sec = os::elapsedTime(); | |
5224 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
5225 non_young_time_ms += elapsed_ms; | |
5226 | |
5227 start_sec = os::elapsedTime(); | |
5228 non_young = false; | |
5229 } | |
5230 } else { | |
2152 | 5231 double end_sec = os::elapsedTime(); |
5232 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
5233 young_time_ms += elapsed_ms; | |
5234 | |
5235 start_sec = os::elapsedTime(); | |
5236 non_young = true; | |
342 | 5237 } |
5238 | |
5239 rs_lengths += cur->rem_set()->occupied(); | |
5240 | |
5241 HeapRegion* next = cur->next_in_collection_set(); | |
5242 assert(cur->in_collection_set(), "bad CS"); | |
5243 cur->set_next_in_collection_set(NULL); | |
5244 cur->set_in_collection_set(false); | |
5245 | |
5246 if (cur->is_young()) { | |
5247 int index = cur->young_index_in_cset(); | |
5248 guarantee( index != -1, "invariant" ); | |
5249 guarantee( (size_t)index < policy->young_cset_length(), "invariant" ); | |
5250 size_t words_survived = _surviving_young_words[index]; | |
5251 cur->record_surv_words_in_group(words_survived); | |
1394
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|
5252 |
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|
5253 // At this point the we have 'popped' cur from the collection set |
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|
5254 // (linked via next_in_collection_set()) but it is still in the |
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|
5255 // young list (linked via next_young_region()). Clear the |
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|
5256 // _next_young_region field. |
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|
5257 cur->set_next_young_region(NULL); |
342 | 5258 } else { |
5259 int index = cur->young_index_in_cset(); | |
5260 guarantee( index == -1, "invariant" ); | |
5261 } | |
5262 | |
5263 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
5264 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
5265 "invariant" ); | |
5266 | |
5267 if (!cur->evacuation_failed()) { | |
5268 // And the region is empty. | |
2152 | 5269 assert(!cur->is_empty(), "Should not have empty regions in a CS."); |
5270 free_region(cur, &pre_used, &local_free_list, false /* par */); | |
342 | 5271 } else { |
5272 cur->uninstall_surv_rate_group(); | |
5273 if (cur->is_young()) | |
5274 cur->set_young_index_in_cset(-1); | |
5275 cur->set_not_young(); | |
5276 cur->set_evacuation_failed(false); | |
5277 } | |
5278 cur = next; | |
5279 } | |
5280 | |
5281 policy->record_max_rs_lengths(rs_lengths); | |
5282 policy->cset_regions_freed(); | |
5283 | |
5284 double end_sec = os::elapsedTime(); | |
5285 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
5286 if (non_young) | |
5287 non_young_time_ms += elapsed_ms; | |
5288 else | |
5289 young_time_ms += elapsed_ms; | |
5290 | |
2152 | 5291 update_sets_after_freeing_regions(pre_used, &local_free_list, |
5292 NULL /* humongous_proxy_set */, | |
5293 false /* par */); | |
342 | 5294 policy->record_young_free_cset_time_ms(young_time_ms); |
5295 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
5296 } | |
5297 | |
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5298 // This routine is similar to the above but does not record |
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5299 // any policy statistics or update free lists; we are abandoning |
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5300 // the current incremental collection set in preparation of a |
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5301 // full collection. After the full GC we will start to build up |
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5302 // the incremental collection set again. |
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5303 // This is only called when we're doing a full collection |
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5304 // and is immediately followed by the tearing down of the young list. |
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5305 |
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5306 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
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5307 HeapRegion* cur = cs_head; |
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5308 |
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5309 while (cur != NULL) { |
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5310 HeapRegion* next = cur->next_in_collection_set(); |
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5311 assert(cur->in_collection_set(), "bad CS"); |
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5312 cur->set_next_in_collection_set(NULL); |
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5313 cur->set_in_collection_set(false); |
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5314 cur->set_young_index_in_cset(-1); |
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5315 cur = next; |
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5316 } |
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5317 } |
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5318 |
2152 | 5319 void G1CollectedHeap::set_free_regions_coming() { |
5320 if (G1ConcRegionFreeingVerbose) { | |
5321 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
5322 "setting free regions coming"); | |
5323 } | |
5324 | |
5325 assert(!free_regions_coming(), "pre-condition"); | |
5326 _free_regions_coming = true; | |
342 | 5327 } |
5328 | |
2152 | 5329 void G1CollectedHeap::reset_free_regions_coming() { |
5330 { | |
5331 assert(free_regions_coming(), "pre-condition"); | |
5332 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
5333 _free_regions_coming = false; | |
5334 SecondaryFreeList_lock->notify_all(); | |
5335 } | |
5336 | |
5337 if (G1ConcRegionFreeingVerbose) { | |
5338 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
5339 "reset free regions coming"); | |
342 | 5340 } |
5341 } | |
5342 | |
2152 | 5343 void G1CollectedHeap::wait_while_free_regions_coming() { |
5344 // Most of the time we won't have to wait, so let's do a quick test | |
5345 // first before we take the lock. | |
5346 if (!free_regions_coming()) { | |
5347 return; | |
5348 } | |
5349 | |
5350 if (G1ConcRegionFreeingVerbose) { | |
5351 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
5352 "waiting for free regions"); | |
342 | 5353 } |
5354 | |
5355 { | |
2152 | 5356 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
5357 while (free_regions_coming()) { | |
5358 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
342 | 5359 } |
2152 | 5360 } |
5361 | |
5362 if (G1ConcRegionFreeingVerbose) { | |
5363 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
5364 "done waiting for free regions"); | |
5365 } | |
342 | 5366 } |
5367 | |
5368 size_t G1CollectedHeap::n_regions() { | |
5369 return _hrs->length(); | |
5370 } | |
5371 | |
5372 size_t G1CollectedHeap::max_regions() { | |
5373 return | |
2188
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5374 (size_t)align_size_up(max_capacity(), HeapRegion::GrainBytes) / |
342 | 5375 HeapRegion::GrainBytes; |
5376 } | |
5377 | |
5378 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
5379 assert(heap_lock_held_for_gc(), | |
5380 "the heap lock should already be held by or for this thread"); | |
5381 _young_list->push_region(hr); | |
5382 g1_policy()->set_region_short_lived(hr); | |
5383 } | |
5384 | |
5385 class NoYoungRegionsClosure: public HeapRegionClosure { | |
5386 private: | |
5387 bool _success; | |
5388 public: | |
5389 NoYoungRegionsClosure() : _success(true) { } | |
5390 bool doHeapRegion(HeapRegion* r) { | |
5391 if (r->is_young()) { | |
5392 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
5393 r->bottom(), r->end()); | |
5394 _success = false; | |
5395 } | |
5396 return false; | |
5397 } | |
5398 bool success() { return _success; } | |
5399 }; | |
5400 | |
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5401 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
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5402 bool ret = _young_list->check_list_empty(check_sample); |
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5403 |
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5404 if (check_heap) { |
342 | 5405 NoYoungRegionsClosure closure; |
5406 heap_region_iterate(&closure); | |
5407 ret = ret && closure.success(); | |
5408 } | |
5409 | |
5410 return ret; | |
5411 } | |
5412 | |
5413 void G1CollectedHeap::empty_young_list() { | |
5414 assert(heap_lock_held_for_gc(), | |
5415 "the heap lock should already be held by or for this thread"); | |
5416 assert(g1_policy()->in_young_gc_mode(), "should be in young GC mode"); | |
5417 | |
5418 _young_list->empty_list(); | |
5419 } | |
5420 | |
5421 bool G1CollectedHeap::all_alloc_regions_no_allocs_since_save_marks() { | |
5422 bool no_allocs = true; | |
5423 for (int ap = 0; ap < GCAllocPurposeCount && no_allocs; ++ap) { | |
5424 HeapRegion* r = _gc_alloc_regions[ap]; | |
5425 no_allocs = r == NULL || r->saved_mark_at_top(); | |
5426 } | |
5427 return no_allocs; | |
5428 } | |
5429 | |
545 | 5430 void G1CollectedHeap::retire_all_alloc_regions() { |
342 | 5431 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
5432 HeapRegion* r = _gc_alloc_regions[ap]; | |
5433 if (r != NULL) { | |
5434 // Check for aliases. | |
5435 bool has_processed_alias = false; | |
5436 for (int i = 0; i < ap; ++i) { | |
5437 if (_gc_alloc_regions[i] == r) { | |
5438 has_processed_alias = true; | |
5439 break; | |
5440 } | |
5441 } | |
5442 if (!has_processed_alias) { | |
545 | 5443 retire_alloc_region(r, false /* par */); |
342 | 5444 } |
5445 } | |
5446 } | |
5447 } | |
5448 | |
5449 // Done at the start of full GC. | |
5450 void G1CollectedHeap::tear_down_region_lists() { | |
2152 | 5451 _free_list.remove_all(); |
342 | 5452 } |
5453 | |
5454 class RegionResetter: public HeapRegionClosure { | |
2152 | 5455 G1CollectedHeap* _g1h; |
5456 FreeRegionList _local_free_list; | |
5457 | |
342 | 5458 public: |
2152 | 5459 RegionResetter() : _g1h(G1CollectedHeap::heap()), |
5460 _local_free_list("Local Free List for RegionResetter") { } | |
5461 | |
342 | 5462 bool doHeapRegion(HeapRegion* r) { |
5463 if (r->continuesHumongous()) return false; | |
5464 if (r->top() > r->bottom()) { | |
5465 if (r->top() < r->end()) { | |
5466 Copy::fill_to_words(r->top(), | |
5467 pointer_delta(r->end(), r->top())); | |
5468 } | |
5469 } else { | |
5470 assert(r->is_empty(), "tautology"); | |
2152 | 5471 _local_free_list.add_as_tail(r); |
342 | 5472 } |
5473 return false; | |
5474 } | |
5475 | |
2152 | 5476 void update_free_lists() { |
5477 _g1h->update_sets_after_freeing_regions(0, &_local_free_list, NULL, | |
5478 false /* par */); | |
5479 } | |
342 | 5480 }; |
5481 | |
5482 // Done at the end of full GC. | |
5483 void G1CollectedHeap::rebuild_region_lists() { | |
5484 // This needs to go at the end of the full GC. | |
5485 RegionResetter rs; | |
5486 heap_region_iterate(&rs); | |
2152 | 5487 rs.update_free_lists(); |
342 | 5488 } |
5489 | |
5490 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
5491 _refine_cte_cl->set_concurrent(concurrent); | |
5492 } | |
5493 | |
5494 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
5495 HeapRegion* hr = heap_region_containing(p); | |
5496 if (hr == NULL) { | |
5497 return is_in_permanent(p); | |
5498 } else { | |
5499 return hr->is_in(p); | |
5500 } | |
5501 } | |
2152 | 5502 |
5503 class VerifyRegionListsClosure : public HeapRegionClosure { | |
5504 private: | |
5505 HumongousRegionSet* _humongous_set; | |
5506 FreeRegionList* _free_list; | |
5507 size_t _region_count; | |
5508 | |
5509 public: | |
5510 VerifyRegionListsClosure(HumongousRegionSet* humongous_set, | |
5511 FreeRegionList* free_list) : | |
5512 _humongous_set(humongous_set), _free_list(free_list), | |
5513 _region_count(0) { } | |
5514 | |
5515 size_t region_count() { return _region_count; } | |
5516 | |
5517 bool doHeapRegion(HeapRegion* hr) { | |
5518 _region_count += 1; | |
5519 | |
5520 if (hr->continuesHumongous()) { | |
5521 return false; | |
5522 } | |
5523 | |
5524 if (hr->is_young()) { | |
5525 // TODO | |
5526 } else if (hr->startsHumongous()) { | |
5527 _humongous_set->verify_next_region(hr); | |
5528 } else if (hr->is_empty()) { | |
5529 _free_list->verify_next_region(hr); | |
5530 } | |
5531 return false; | |
5532 } | |
5533 }; | |
5534 | |
5535 void G1CollectedHeap::verify_region_sets() { | |
5536 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); | |
5537 | |
5538 // First, check the explicit lists. | |
5539 _free_list.verify(); | |
5540 { | |
5541 // Given that a concurrent operation might be adding regions to | |
5542 // the secondary free list we have to take the lock before | |
5543 // verifying it. | |
5544 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
5545 _secondary_free_list.verify(); | |
5546 } | |
5547 _humongous_set.verify(); | |
5548 | |
5549 // If a concurrent region freeing operation is in progress it will | |
5550 // be difficult to correctly attributed any free regions we come | |
5551 // across to the correct free list given that they might belong to | |
5552 // one of several (free_list, secondary_free_list, any local lists, | |
5553 // etc.). So, if that's the case we will skip the rest of the | |
5554 // verification operation. Alternatively, waiting for the concurrent | |
5555 // operation to complete will have a non-trivial effect on the GC's | |
5556 // operation (no concurrent operation will last longer than the | |
5557 // interval between two calls to verification) and it might hide | |
5558 // any issues that we would like to catch during testing. | |
5559 if (free_regions_coming()) { | |
5560 return; | |
5561 } | |
5562 | |
2361 | 5563 // Make sure we append the secondary_free_list on the free_list so |
5564 // that all free regions we will come across can be safely | |
5565 // attributed to the free_list. | |
5566 append_secondary_free_list_if_not_empty_with_lock(); | |
2152 | 5567 |
5568 // Finally, make sure that the region accounting in the lists is | |
5569 // consistent with what we see in the heap. | |
5570 _humongous_set.verify_start(); | |
5571 _free_list.verify_start(); | |
5572 | |
5573 VerifyRegionListsClosure cl(&_humongous_set, &_free_list); | |
5574 heap_region_iterate(&cl); | |
5575 | |
5576 _humongous_set.verify_end(); | |
5577 _free_list.verify_end(); | |
342 | 5578 } |