Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 3778:5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
Summary: Extend and make more consistent the output from the G1PrintHeapRegions flag.
Reviewed-by: johnc, jmasa
author | tonyp |
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date | Fri, 24 Jun 2011 12:38:49 -0400 |
parents | e8b0b0392037 |
children | 14a2fd14c0db |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #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" | |
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31 #include "gc_implementation/g1/g1AllocRegion.inline.hpp" |
1972 | 32 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
33 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
34 #include "gc_implementation/g1/g1MarkSweep.hpp" | |
35 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
36 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
37 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
38 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
39 #include "gc_implementation/g1/vm_operations_g1.hpp" | |
40 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
41 #include "memory/gcLocker.inline.hpp" | |
42 #include "memory/genOopClosures.inline.hpp" | |
43 #include "memory/generationSpec.hpp" | |
44 #include "oops/oop.inline.hpp" | |
45 #include "oops/oop.pcgc.inline.hpp" | |
46 #include "runtime/aprofiler.hpp" | |
47 #include "runtime/vmThread.hpp" | |
342 | 48 |
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49 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0; |
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50 |
342 | 51 // turn it on so that the contents of the young list (scan-only / |
52 // to-be-collected) are printed at "strategic" points before / during | |
53 // / after the collection --- this is useful for debugging | |
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54 #define YOUNG_LIST_VERBOSE 0 |
342 | 55 // CURRENT STATUS |
56 // This file is under construction. Search for "FIXME". | |
57 | |
58 // INVARIANTS/NOTES | |
59 // | |
60 // All allocation activity covered by the G1CollectedHeap interface is | |
1973 | 61 // serialized by acquiring the HeapLock. This happens in mem_allocate |
62 // and allocate_new_tlab, which are the "entry" points to the | |
63 // allocation code from the rest of the JVM. (Note that this does not | |
64 // apply to TLAB allocation, which is not part of this interface: it | |
65 // is done by clients of this interface.) | |
342 | 66 |
67 // Local to this file. | |
68 | |
69 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
70 SuspendibleThreadSet* _sts; | |
71 G1RemSet* _g1rs; | |
72 ConcurrentG1Refine* _cg1r; | |
73 bool _concurrent; | |
74 public: | |
75 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
76 G1RemSet* g1rs, | |
77 ConcurrentG1Refine* cg1r) : | |
78 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
79 {} | |
80 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
1705 | 81 bool oops_into_cset = _g1rs->concurrentRefineOneCard(card_ptr, worker_i, false); |
82 // This path is executed by the concurrent refine or mutator threads, | |
83 // concurrently, and so we do not care if card_ptr contains references | |
84 // that point into the collection set. | |
85 assert(!oops_into_cset, "should be"); | |
86 | |
342 | 87 if (_concurrent && _sts->should_yield()) { |
88 // Caller will actually yield. | |
89 return false; | |
90 } | |
91 // Otherwise, we finished successfully; return true. | |
92 return true; | |
93 } | |
94 void set_concurrent(bool b) { _concurrent = b; } | |
95 }; | |
96 | |
97 | |
98 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
99 int _calls; | |
100 G1CollectedHeap* _g1h; | |
101 CardTableModRefBS* _ctbs; | |
102 int _histo[256]; | |
103 public: | |
104 ClearLoggedCardTableEntryClosure() : | |
105 _calls(0) | |
106 { | |
107 _g1h = G1CollectedHeap::heap(); | |
108 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
109 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
110 } | |
111 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
112 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
113 _calls++; | |
114 unsigned char* ujb = (unsigned char*)card_ptr; | |
115 int ind = (int)(*ujb); | |
116 _histo[ind]++; | |
117 *card_ptr = -1; | |
118 } | |
119 return true; | |
120 } | |
121 int calls() { return _calls; } | |
122 void print_histo() { | |
123 gclog_or_tty->print_cr("Card table value histogram:"); | |
124 for (int i = 0; i < 256; i++) { | |
125 if (_histo[i] != 0) { | |
126 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
127 } | |
128 } | |
129 } | |
130 }; | |
131 | |
132 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
133 int _calls; | |
134 G1CollectedHeap* _g1h; | |
135 CardTableModRefBS* _ctbs; | |
136 public: | |
137 RedirtyLoggedCardTableEntryClosure() : | |
138 _calls(0) | |
139 { | |
140 _g1h = G1CollectedHeap::heap(); | |
141 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
142 } | |
143 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
144 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
145 _calls++; | |
146 *card_ptr = 0; | |
147 } | |
148 return true; | |
149 } | |
150 int calls() { return _calls; } | |
151 }; | |
152 | |
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153 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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154 public: |
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155 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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156 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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157 return true; |
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158 } |
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159 }; |
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160 |
342 | 161 YoungList::YoungList(G1CollectedHeap* g1h) |
162 : _g1h(g1h), _head(NULL), | |
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163 _length(0), |
342 | 164 _last_sampled_rs_lengths(0), |
545 | 165 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) |
342 | 166 { |
167 guarantee( check_list_empty(false), "just making sure..." ); | |
168 } | |
169 | |
170 void YoungList::push_region(HeapRegion *hr) { | |
171 assert(!hr->is_young(), "should not already be young"); | |
172 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
173 | |
174 hr->set_next_young_region(_head); | |
175 _head = hr; | |
176 | |
177 hr->set_young(); | |
178 double yg_surv_rate = _g1h->g1_policy()->predict_yg_surv_rate((int)_length); | |
179 ++_length; | |
180 } | |
181 | |
182 void YoungList::add_survivor_region(HeapRegion* hr) { | |
545 | 183 assert(hr->is_survivor(), "should be flagged as survivor region"); |
342 | 184 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
185 | |
186 hr->set_next_young_region(_survivor_head); | |
187 if (_survivor_head == NULL) { | |
545 | 188 _survivor_tail = hr; |
342 | 189 } |
190 _survivor_head = hr; | |
191 | |
192 ++_survivor_length; | |
193 } | |
194 | |
195 void YoungList::empty_list(HeapRegion* list) { | |
196 while (list != NULL) { | |
197 HeapRegion* next = list->get_next_young_region(); | |
198 list->set_next_young_region(NULL); | |
199 list->uninstall_surv_rate_group(); | |
200 list->set_not_young(); | |
201 list = next; | |
202 } | |
203 } | |
204 | |
205 void YoungList::empty_list() { | |
206 assert(check_list_well_formed(), "young list should be well formed"); | |
207 | |
208 empty_list(_head); | |
209 _head = NULL; | |
210 _length = 0; | |
211 | |
212 empty_list(_survivor_head); | |
213 _survivor_head = NULL; | |
545 | 214 _survivor_tail = NULL; |
342 | 215 _survivor_length = 0; |
216 | |
217 _last_sampled_rs_lengths = 0; | |
218 | |
219 assert(check_list_empty(false), "just making sure..."); | |
220 } | |
221 | |
222 bool YoungList::check_list_well_formed() { | |
223 bool ret = true; | |
224 | |
225 size_t length = 0; | |
226 HeapRegion* curr = _head; | |
227 HeapRegion* last = NULL; | |
228 while (curr != NULL) { | |
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229 if (!curr->is_young()) { |
342 | 230 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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231 "incorrectly tagged (y: %d, surv: %d)", |
342 | 232 curr->bottom(), curr->end(), |
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233 curr->is_young(), curr->is_survivor()); |
342 | 234 ret = false; |
235 } | |
236 ++length; | |
237 last = curr; | |
238 curr = curr->get_next_young_region(); | |
239 } | |
240 ret = ret && (length == _length); | |
241 | |
242 if (!ret) { | |
243 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
244 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
245 length, _length); | |
246 } | |
247 | |
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248 return ret; |
342 | 249 } |
250 | |
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251 bool YoungList::check_list_empty(bool check_sample) { |
342 | 252 bool ret = true; |
253 | |
254 if (_length != 0) { | |
255 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
256 _length); | |
257 ret = false; | |
258 } | |
259 if (check_sample && _last_sampled_rs_lengths != 0) { | |
260 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
261 ret = false; | |
262 } | |
263 if (_head != NULL) { | |
264 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
265 ret = false; | |
266 } | |
267 if (!ret) { | |
268 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
269 } | |
270 | |
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271 return ret; |
342 | 272 } |
273 | |
274 void | |
275 YoungList::rs_length_sampling_init() { | |
276 _sampled_rs_lengths = 0; | |
277 _curr = _head; | |
278 } | |
279 | |
280 bool | |
281 YoungList::rs_length_sampling_more() { | |
282 return _curr != NULL; | |
283 } | |
284 | |
285 void | |
286 YoungList::rs_length_sampling_next() { | |
287 assert( _curr != NULL, "invariant" ); | |
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288 size_t rs_length = _curr->rem_set()->occupied(); |
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289 |
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290 _sampled_rs_lengths += rs_length; |
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291 |
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292 // The current region may not yet have been added to the |
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293 // incremental collection set (it gets added when it is |
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294 // retired as the current allocation region). |
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295 if (_curr->in_collection_set()) { |
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296 // Update the collection set policy information for this region |
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297 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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298 } |
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299 |
342 | 300 _curr = _curr->get_next_young_region(); |
301 if (_curr == NULL) { | |
302 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
303 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
304 } | |
305 } | |
306 | |
307 void | |
308 YoungList::reset_auxilary_lists() { | |
309 guarantee( is_empty(), "young list should be empty" ); | |
310 assert(check_list_well_formed(), "young list should be well formed"); | |
311 | |
312 // Add survivor regions to SurvRateGroup. | |
313 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
545 | 314 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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315 |
342 | 316 for (HeapRegion* curr = _survivor_head; |
317 curr != NULL; | |
318 curr = curr->get_next_young_region()) { | |
319 _g1h->g1_policy()->set_region_survivors(curr); | |
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320 |
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321 // The region is a non-empty survivor so let's add it to |
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322 // the incremental collection set for the next evacuation |
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323 // pause. |
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324 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
342 | 325 } |
326 _g1h->g1_policy()->note_stop_adding_survivor_regions(); | |
327 | |
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328 _head = _survivor_head; |
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329 _length = _survivor_length; |
342 | 330 if (_survivor_head != NULL) { |
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331 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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332 assert(_survivor_length > 0, "invariant"); |
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333 _survivor_tail->set_next_young_region(NULL); |
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334 } |
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335 |
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336 // Don't clear the survivor list handles until the start of |
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337 // the next evacuation pause - we need it in order to re-tag |
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338 // the survivor regions from this evacuation pause as 'young' |
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339 // at the start of the next. |
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340 |
545 | 341 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
342 | 342 |
343 assert(check_list_well_formed(), "young list should be well formed"); | |
344 } | |
345 | |
346 void YoungList::print() { | |
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347 HeapRegion* lists[] = {_head, _survivor_head}; |
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348 const char* names[] = {"YOUNG", "SURVIVOR"}; |
342 | 349 |
350 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
351 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
352 HeapRegion *curr = lists[list]; | |
353 if (curr == NULL) | |
354 gclog_or_tty->print_cr(" empty"); | |
355 while (curr != NULL) { | |
356 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
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357 "age: %4d, y: %d, surv: %d", |
342 | 358 curr->bottom(), curr->end(), |
359 curr->top(), | |
360 curr->prev_top_at_mark_start(), | |
361 curr->next_top_at_mark_start(), | |
362 curr->top_at_conc_mark_count(), | |
363 curr->age_in_surv_rate_group_cond(), | |
364 curr->is_young(), | |
365 curr->is_survivor()); | |
366 curr = curr->get_next_young_region(); | |
367 } | |
368 } | |
369 | |
370 gclog_or_tty->print_cr(""); | |
371 } | |
372 | |
796
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373 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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374 { |
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375 // Claim the right to put the region on the dirty cards region list |
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376 // by installing a self pointer. |
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377 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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378 if (next == NULL) { |
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379 HeapRegion* res = (HeapRegion*) |
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380 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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381 NULL); |
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382 if (res == NULL) { |
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383 HeapRegion* head; |
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384 do { |
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385 // Put the region to the dirty cards region list. |
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386 head = _dirty_cards_region_list; |
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387 next = (HeapRegion*) |
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388 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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389 if (next == head) { |
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390 assert(hr->get_next_dirty_cards_region() == hr, |
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391 "hr->get_next_dirty_cards_region() != hr"); |
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392 if (next == NULL) { |
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393 // The last region in the list points to itself. |
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394 hr->set_next_dirty_cards_region(hr); |
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395 } else { |
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396 hr->set_next_dirty_cards_region(next); |
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397 } |
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398 } |
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399 } while (next != head); |
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400 } |
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401 } |
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402 } |
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403 |
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404 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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405 { |
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406 HeapRegion* head; |
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407 HeapRegion* hr; |
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408 do { |
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409 head = _dirty_cards_region_list; |
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410 if (head == NULL) { |
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411 return NULL; |
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412 } |
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413 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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414 if (head == new_head) { |
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415 // The last region. |
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416 new_head = NULL; |
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417 } |
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418 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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419 head); |
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420 } while (hr != head); |
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421 assert(hr != NULL, "invariant"); |
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422 hr->set_next_dirty_cards_region(NULL); |
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423 return hr; |
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424 } |
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425 |
342 | 426 void G1CollectedHeap::stop_conc_gc_threads() { |
794 | 427 _cg1r->stop(); |
342 | 428 _cmThread->stop(); |
429 } | |
430 | |
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431 #ifdef ASSERT |
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432 // A region is added to the collection set as it is retired |
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433 // so an address p can point to a region which will be in the |
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434 // collection set but has not yet been retired. This method |
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435 // therefore is only accurate during a GC pause after all |
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436 // regions have been retired. It is used for debugging |
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437 // to check if an nmethod has references to objects that can |
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438 // be move during a partial collection. Though it can be |
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439 // inaccurate, it is sufficient for G1 because the conservative |
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440 // implementation of is_scavengable() for G1 will indicate that |
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441 // all nmethods must be scanned during a partial collection. |
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442 bool G1CollectedHeap::is_in_partial_collection(const void* p) { |
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443 HeapRegion* hr = heap_region_containing(p); |
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444 return hr != NULL && hr->in_collection_set(); |
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445 } |
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446 #endif |
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447 |
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448 // Returns true if the reference points to an object that |
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449 // can move in an incremental collecction. |
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450 bool G1CollectedHeap::is_scavengable(const void* p) { |
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451 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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452 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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453 HeapRegion* hr = heap_region_containing(p); |
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454 if (hr == NULL) { |
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455 // perm gen (or null) |
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456 return false; |
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457 } else { |
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458 return !hr->isHumongous(); |
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459 } |
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460 } |
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461 |
342 | 462 void G1CollectedHeap::check_ct_logs_at_safepoint() { |
463 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
464 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
465 | |
466 // Count the dirty cards at the start. | |
467 CountNonCleanMemRegionClosure count1(this); | |
468 ct_bs->mod_card_iterate(&count1); | |
469 int orig_count = count1.n(); | |
470 | |
471 // First clear the logged cards. | |
472 ClearLoggedCardTableEntryClosure clear; | |
473 dcqs.set_closure(&clear); | |
474 dcqs.apply_closure_to_all_completed_buffers(); | |
475 dcqs.iterate_closure_all_threads(false); | |
476 clear.print_histo(); | |
477 | |
478 // Now ensure that there's no dirty cards. | |
479 CountNonCleanMemRegionClosure count2(this); | |
480 ct_bs->mod_card_iterate(&count2); | |
481 if (count2.n() != 0) { | |
482 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
483 count2.n(), orig_count); | |
484 } | |
485 guarantee(count2.n() == 0, "Card table should be clean."); | |
486 | |
487 RedirtyLoggedCardTableEntryClosure redirty; | |
488 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
489 dcqs.apply_closure_to_all_completed_buffers(); | |
490 dcqs.iterate_closure_all_threads(false); | |
491 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
492 clear.calls(), orig_count); | |
493 guarantee(redirty.calls() == clear.calls(), | |
494 "Or else mechanism is broken."); | |
495 | |
496 CountNonCleanMemRegionClosure count3(this); | |
497 ct_bs->mod_card_iterate(&count3); | |
498 if (count3.n() != orig_count) { | |
499 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
500 orig_count, count3.n()); | |
501 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
502 } | |
503 | |
504 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
505 } | |
506 | |
507 // Private class members. | |
508 | |
509 G1CollectedHeap* G1CollectedHeap::_g1h; | |
510 | |
511 // Private methods. | |
512 | |
2152 | 513 HeapRegion* |
2361 | 514 G1CollectedHeap::new_region_try_secondary_free_list() { |
2152 | 515 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
516 while (!_secondary_free_list.is_empty() || free_regions_coming()) { | |
517 if (!_secondary_free_list.is_empty()) { | |
518 if (G1ConcRegionFreeingVerbose) { | |
519 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
520 "secondary_free_list has "SIZE_FORMAT" entries", | |
521 _secondary_free_list.length()); | |
522 } | |
523 // It looks as if there are free regions available on the | |
524 // secondary_free_list. Let's move them to the free_list and try | |
525 // again to allocate from it. | |
526 append_secondary_free_list(); | |
527 | |
528 assert(!_free_list.is_empty(), "if the secondary_free_list was not " | |
529 "empty we should have moved at least one entry to the free_list"); | |
530 HeapRegion* res = _free_list.remove_head(); | |
531 if (G1ConcRegionFreeingVerbose) { | |
532 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
533 "allocated "HR_FORMAT" from secondary_free_list", | |
534 HR_FORMAT_PARAMS(res)); | |
535 } | |
536 return res; | |
537 } | |
538 | |
539 // Wait here until we get notifed either when (a) there are no | |
540 // more free regions coming or (b) some regions have been moved on | |
541 // the secondary_free_list. | |
542 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
543 } | |
544 | |
545 if (G1ConcRegionFreeingVerbose) { | |
546 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
547 "could not allocate from secondary_free_list"); | |
548 } | |
549 return NULL; | |
550 } | |
551 | |
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552 HeapRegion* G1CollectedHeap::new_region(size_t word_size, bool do_expand) { |
2152 | 553 assert(!isHumongous(word_size) || |
554 word_size <= (size_t) HeapRegion::GrainWords, | |
555 "the only time we use this to allocate a humongous region is " | |
556 "when we are allocating a single humongous region"); | |
557 | |
558 HeapRegion* res; | |
559 if (G1StressConcRegionFreeing) { | |
560 if (!_secondary_free_list.is_empty()) { | |
561 if (G1ConcRegionFreeingVerbose) { | |
562 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
563 "forced to look at the secondary_free_list"); | |
564 } | |
2361 | 565 res = new_region_try_secondary_free_list(); |
2152 | 566 if (res != NULL) { |
567 return res; | |
568 } | |
569 } | |
570 } | |
571 res = _free_list.remove_head_or_null(); | |
572 if (res == NULL) { | |
573 if (G1ConcRegionFreeingVerbose) { | |
574 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
575 "res == NULL, trying the secondary_free_list"); | |
576 } | |
2361 | 577 res = new_region_try_secondary_free_list(); |
2152 | 578 } |
342 | 579 if (res == NULL && do_expand) { |
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580 if (expand(word_size * HeapWordSize)) { |
3766 | 581 // Even though the heap was expanded, it might not have reached |
582 // the desired size. So, we cannot assume that the allocation | |
583 // will succeed. | |
584 res = _free_list.remove_head_or_null(); | |
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585 } |
342 | 586 } |
587 return res; | |
588 } | |
589 | |
2152 | 590 HeapRegion* G1CollectedHeap::new_gc_alloc_region(int purpose, |
591 size_t word_size) { | |
342 | 592 HeapRegion* alloc_region = NULL; |
593 if (_gc_alloc_region_counts[purpose] < g1_policy()->max_regions(purpose)) { | |
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594 alloc_region = new_region(word_size, true /* do_expand */); |
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595 if (alloc_region != NULL) { |
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596 if (purpose == GCAllocForSurvived) { |
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597 _hr_printer.alloc(alloc_region, G1HRPrinter::Survivor); |
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598 alloc_region->set_survivor(); |
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599 } else { |
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600 _hr_printer.alloc(alloc_region, G1HRPrinter::Old); |
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601 } |
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602 ++_gc_alloc_region_counts[purpose]; |
342 | 603 } |
604 } else { | |
605 g1_policy()->note_alloc_region_limit_reached(purpose); | |
606 } | |
607 return alloc_region; | |
608 } | |
609 | |
3766 | 610 size_t G1CollectedHeap::humongous_obj_allocate_find_first(size_t num_regions, |
611 size_t word_size) { | |
2361 | 612 assert(isHumongous(word_size), "word_size should be humongous"); |
613 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
614 | |
3766 | 615 size_t first = G1_NULL_HRS_INDEX; |
2152 | 616 if (num_regions == 1) { |
617 // Only one region to allocate, no need to go through the slower | |
618 // path. The caller will attempt the expasion if this fails, so | |
619 // let's not try to expand here too. | |
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620 HeapRegion* hr = new_region(word_size, false /* do_expand */); |
2152 | 621 if (hr != NULL) { |
622 first = hr->hrs_index(); | |
623 } else { | |
3766 | 624 first = G1_NULL_HRS_INDEX; |
2152 | 625 } |
626 } else { | |
627 // We can't allocate humongous regions while cleanupComplete() is | |
628 // running, since some of the regions we find to be empty might not | |
629 // yet be added to the free list and it is not straightforward to | |
630 // know which list they are on so that we can remove them. Note | |
631 // that we only need to do this if we need to allocate more than | |
632 // one region to satisfy the current humongous allocation | |
633 // request. If we are only allocating one region we use the common | |
634 // region allocation code (see above). | |
635 wait_while_free_regions_coming(); | |
2361 | 636 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 637 |
638 if (free_regions() >= num_regions) { | |
3766 | 639 first = _hrs.find_contiguous(num_regions); |
640 if (first != G1_NULL_HRS_INDEX) { | |
641 for (size_t i = first; i < first + num_regions; ++i) { | |
642 HeapRegion* hr = region_at(i); | |
2152 | 643 assert(hr->is_empty(), "sanity"); |
2361 | 644 assert(is_on_master_free_list(hr), "sanity"); |
2152 | 645 hr->set_pending_removal(true); |
646 } | |
647 _free_list.remove_all_pending(num_regions); | |
648 } | |
649 } | |
650 } | |
651 return first; | |
652 } | |
653 | |
2361 | 654 HeapWord* |
3766 | 655 G1CollectedHeap::humongous_obj_allocate_initialize_regions(size_t first, |
2361 | 656 size_t num_regions, |
657 size_t word_size) { | |
3766 | 658 assert(first != G1_NULL_HRS_INDEX, "pre-condition"); |
2361 | 659 assert(isHumongous(word_size), "word_size should be humongous"); |
660 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
661 | |
662 // Index of last region in the series + 1. | |
3766 | 663 size_t last = first + num_regions; |
2361 | 664 |
665 // We need to initialize the region(s) we just discovered. This is | |
666 // a bit tricky given that it can happen concurrently with | |
667 // refinement threads refining cards on these regions and | |
668 // potentially wanting to refine the BOT as they are scanning | |
669 // those cards (this can happen shortly after a cleanup; see CR | |
670 // 6991377). So we have to set up the region(s) carefully and in | |
671 // a specific order. | |
672 | |
673 // The word size sum of all the regions we will allocate. | |
674 size_t word_size_sum = num_regions * HeapRegion::GrainWords; | |
675 assert(word_size <= word_size_sum, "sanity"); | |
676 | |
677 // This will be the "starts humongous" region. | |
3766 | 678 HeapRegion* first_hr = region_at(first); |
2361 | 679 // The header of the new object will be placed at the bottom of |
680 // the first region. | |
681 HeapWord* new_obj = first_hr->bottom(); | |
682 // This will be the new end of the first region in the series that | |
683 // should also match the end of the last region in the seriers. | |
684 HeapWord* new_end = new_obj + word_size_sum; | |
685 // This will be the new top of the first region that will reflect | |
686 // this allocation. | |
687 HeapWord* new_top = new_obj + word_size; | |
688 | |
689 // First, we need to zero the header of the space that we will be | |
690 // allocating. When we update top further down, some refinement | |
691 // threads might try to scan the region. By zeroing the header we | |
692 // ensure that any thread that will try to scan the region will | |
693 // come across the zero klass word and bail out. | |
694 // | |
695 // NOTE: It would not have been correct to have used | |
696 // CollectedHeap::fill_with_object() and make the space look like | |
697 // an int array. The thread that is doing the allocation will | |
698 // later update the object header to a potentially different array | |
699 // type and, for a very short period of time, the klass and length | |
700 // fields will be inconsistent. This could cause a refinement | |
701 // thread to calculate the object size incorrectly. | |
702 Copy::fill_to_words(new_obj, oopDesc::header_size(), 0); | |
703 | |
704 // We will set up the first region as "starts humongous". This | |
705 // will also update the BOT covering all the regions to reflect | |
706 // that there is a single object that starts at the bottom of the | |
707 // first region. | |
708 first_hr->set_startsHumongous(new_top, new_end); | |
709 | |
710 // Then, if there are any, we will set up the "continues | |
711 // humongous" regions. | |
712 HeapRegion* hr = NULL; | |
3766 | 713 for (size_t i = first + 1; i < last; ++i) { |
714 hr = region_at(i); | |
2361 | 715 hr->set_continuesHumongous(first_hr); |
716 } | |
717 // If we have "continues humongous" regions (hr != NULL), then the | |
718 // end of the last one should match new_end. | |
719 assert(hr == NULL || hr->end() == new_end, "sanity"); | |
720 | |
721 // Up to this point no concurrent thread would have been able to | |
722 // do any scanning on any region in this series. All the top | |
723 // fields still point to bottom, so the intersection between | |
724 // [bottom,top] and [card_start,card_end] will be empty. Before we | |
725 // update the top fields, we'll do a storestore to make sure that | |
726 // no thread sees the update to top before the zeroing of the | |
727 // object header and the BOT initialization. | |
728 OrderAccess::storestore(); | |
729 | |
730 // Now that the BOT and the object header have been initialized, | |
731 // we can update top of the "starts humongous" region. | |
732 assert(first_hr->bottom() < new_top && new_top <= first_hr->end(), | |
733 "new_top should be in this region"); | |
734 first_hr->set_top(new_top); | |
3778
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735 if (_hr_printer.is_active()) { |
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736 HeapWord* bottom = first_hr->bottom(); |
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737 HeapWord* end = first_hr->orig_end(); |
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738 if ((first + 1) == last) { |
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739 // the series has a single humongous region |
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740 _hr_printer.alloc(G1HRPrinter::SingleHumongous, first_hr, new_top); |
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741 } else { |
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742 // the series has more than one humongous regions |
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743 _hr_printer.alloc(G1HRPrinter::StartsHumongous, first_hr, end); |
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744 } |
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745 } |
2361 | 746 |
747 // Now, we will update the top fields of the "continues humongous" | |
748 // regions. The reason we need to do this is that, otherwise, | |
749 // these regions would look empty and this will confuse parts of | |
750 // G1. For example, the code that looks for a consecutive number | |
751 // of empty regions will consider them empty and try to | |
752 // re-allocate them. We can extend is_empty() to also include | |
753 // !continuesHumongous(), but it is easier to just update the top | |
754 // fields here. The way we set top for all regions (i.e., top == | |
755 // end for all regions but the last one, top == new_top for the | |
756 // last one) is actually used when we will free up the humongous | |
757 // region in free_humongous_region(). | |
758 hr = NULL; | |
3766 | 759 for (size_t i = first + 1; i < last; ++i) { |
760 hr = region_at(i); | |
2361 | 761 if ((i + 1) == last) { |
762 // last continues humongous region | |
763 assert(hr->bottom() < new_top && new_top <= hr->end(), | |
764 "new_top should fall on this region"); | |
765 hr->set_top(new_top); | |
3778
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766 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, new_top); |
2361 | 767 } else { |
768 // not last one | |
769 assert(new_top > hr->end(), "new_top should be above this region"); | |
770 hr->set_top(hr->end()); | |
3778
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771 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, hr->end()); |
2361 | 772 } |
773 } | |
774 // If we have continues humongous regions (hr != NULL), then the | |
775 // end of the last one should match new_end and its top should | |
776 // match new_top. | |
777 assert(hr == NULL || | |
778 (hr->end() == new_end && hr->top() == new_top), "sanity"); | |
779 | |
780 assert(first_hr->used() == word_size * HeapWordSize, "invariant"); | |
781 _summary_bytes_used += first_hr->used(); | |
782 _humongous_set.add(first_hr); | |
783 | |
784 return new_obj; | |
785 } | |
786 | |
342 | 787 // If could fit into free regions w/o expansion, try. |
788 // Otherwise, if can expand, do so. | |
789 // Otherwise, if using ex regions might help, try with ex given back. | |
1973 | 790 HeapWord* G1CollectedHeap::humongous_obj_allocate(size_t word_size) { |
2152 | 791 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
792 | |
793 verify_region_sets_optional(); | |
342 | 794 |
795 size_t num_regions = | |
1973 | 796 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; |
342 | 797 size_t x_size = expansion_regions(); |
3766 | 798 size_t fs = _hrs.free_suffix(); |
799 size_t first = humongous_obj_allocate_find_first(num_regions, word_size); | |
800 if (first == G1_NULL_HRS_INDEX) { | |
2152 | 801 // The only thing we can do now is attempt expansion. |
342 | 802 if (fs + x_size >= num_regions) { |
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803 // If the number of regions we're trying to allocate for this |
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804 // object is at most the number of regions in the free suffix, |
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805 // then the call to humongous_obj_allocate_find_first() above |
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806 // should have succeeded and we wouldn't be here. |
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807 // |
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808 // We should only be trying to expand when the free suffix is |
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809 // not sufficient for the object _and_ we have some expansion |
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810 // room available. |
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811 assert(num_regions > fs, "earlier allocation should have succeeded"); |
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812 |
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813 if (expand((num_regions - fs) * HeapRegion::GrainBytes)) { |
3766 | 814 // Even though the heap was expanded, it might not have |
815 // reached the desired size. So, we cannot assume that the | |
816 // allocation will succeed. | |
2188
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817 first = humongous_obj_allocate_find_first(num_regions, word_size); |
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818 } |
2152 | 819 } |
820 } | |
821 | |
2361 | 822 HeapWord* result = NULL; |
3766 | 823 if (first != G1_NULL_HRS_INDEX) { |
2361 | 824 result = |
825 humongous_obj_allocate_initialize_regions(first, num_regions, word_size); | |
826 assert(result != NULL, "it should always return a valid result"); | |
2152 | 827 } |
828 | |
829 verify_region_sets_optional(); | |
2361 | 830 |
831 return result; | |
342 | 832 } |
833 | |
1973 | 834 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
835 assert_heap_not_locked_and_not_at_safepoint(); | |
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836 assert(!isHumongous(word_size), "we do not allow humongous TLABs"); |
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837 |
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838 unsigned int dummy_gc_count_before; |
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839 return attempt_allocation(word_size, &dummy_gc_count_before); |
342 | 840 } |
841 | |
842 HeapWord* | |
843 G1CollectedHeap::mem_allocate(size_t word_size, | |
1973 | 844 bool* gc_overhead_limit_was_exceeded) { |
845 assert_heap_not_locked_and_not_at_safepoint(); | |
342 | 846 |
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847 // Loop until the allocation is satisified, or unsatisfied after GC. |
1973 | 848 for (int try_count = 1; /* we'll return */; try_count += 1) { |
849 unsigned int gc_count_before; | |
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850 |
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851 HeapWord* result = NULL; |
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852 if (!isHumongous(word_size)) { |
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853 result = attempt_allocation(word_size, &gc_count_before); |
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854 } else { |
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855 result = attempt_allocation_humongous(word_size, &gc_count_before); |
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856 } |
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857 if (result != NULL) { |
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858 return result; |
342 | 859 } |
860 | |
861 // Create the garbage collection operation... | |
1973 | 862 VM_G1CollectForAllocation op(gc_count_before, word_size); |
342 | 863 // ...and get the VM thread to execute it. |
864 VMThread::execute(&op); | |
1973 | 865 |
866 if (op.prologue_succeeded() && op.pause_succeeded()) { | |
867 // If the operation was successful we'll return the result even | |
868 // if it is NULL. If the allocation attempt failed immediately | |
869 // after a Full GC, it's unlikely we'll be able to allocate now. | |
870 HeapWord* result = op.result(); | |
871 if (result != NULL && !isHumongous(word_size)) { | |
872 // Allocations that take place on VM operations do not do any | |
873 // card dirtying and we have to do it here. We only have to do | |
874 // this for non-humongous allocations, though. | |
875 dirty_young_block(result, word_size); | |
876 } | |
342 | 877 return result; |
1973 | 878 } else { |
879 assert(op.result() == NULL, | |
880 "the result should be NULL if the VM op did not succeed"); | |
342 | 881 } |
882 | |
883 // Give a warning if we seem to be looping forever. | |
884 if ((QueuedAllocationWarningCount > 0) && | |
885 (try_count % QueuedAllocationWarningCount == 0)) { | |
1973 | 886 warning("G1CollectedHeap::mem_allocate retries %d times", try_count); |
342 | 887 } |
888 } | |
1973 | 889 |
890 ShouldNotReachHere(); | |
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891 return NULL; |
342 | 892 } |
893 | |
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894 HeapWord* G1CollectedHeap::attempt_allocation_slow(size_t word_size, |
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895 unsigned int *gc_count_before_ret) { |
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896 // Make sure you read the note in attempt_allocation_humongous(). |
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897 |
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898 assert_heap_not_locked_and_not_at_safepoint(); |
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899 assert(!isHumongous(word_size), "attempt_allocation_slow() should not " |
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900 "be called for humongous allocation requests"); |
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901 |
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902 // We should only get here after the first-level allocation attempt |
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903 // (attempt_allocation()) failed to allocate. |
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904 |
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905 // We will loop until a) we manage to successfully perform the |
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906 // allocation or b) we successfully schedule a collection which |
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907 // fails to perform the allocation. b) is the only case when we'll |
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908 // return NULL. |
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909 HeapWord* result = NULL; |
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910 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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911 bool should_try_gc; |
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|
912 unsigned int gc_count_before; |
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|
913 |
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|
914 { |
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915 MutexLockerEx x(Heap_lock); |
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916 |
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917 result = _mutator_alloc_region.attempt_allocation_locked(word_size, |
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918 false /* bot_updates */); |
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919 if (result != NULL) { |
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920 return result; |
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|
921 } |
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|
922 |
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923 // If we reach here, attempt_allocation_locked() above failed to |
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924 // allocate a new region. So the mutator alloc region should be NULL. |
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925 assert(_mutator_alloc_region.get() == NULL, "only way to get here"); |
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926 |
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927 if (GC_locker::is_active_and_needs_gc()) { |
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928 if (g1_policy()->can_expand_young_list()) { |
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929 result = _mutator_alloc_region.attempt_allocation_force(word_size, |
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930 false /* bot_updates */); |
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931 if (result != NULL) { |
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932 return result; |
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|
933 } |
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|
934 } |
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935 should_try_gc = false; |
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936 } else { |
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937 // Read the GC count while still holding the Heap_lock. |
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938 gc_count_before = SharedHeap::heap()->total_collections(); |
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939 should_try_gc = true; |
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|
940 } |
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|
941 } |
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|
942 |
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943 if (should_try_gc) { |
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|
944 bool succeeded; |
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945 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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946 if (result != NULL) { |
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947 assert(succeeded, "only way to get back a non-NULL result"); |
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948 return result; |
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|
949 } |
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|
950 |
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951 if (succeeded) { |
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952 // If we get here we successfully scheduled a collection which |
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953 // failed to allocate. No point in trying to allocate |
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954 // further. We'll just return NULL. |
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955 MutexLockerEx x(Heap_lock); |
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956 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
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957 return NULL; |
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|
958 } |
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959 } else { |
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960 GC_locker::stall_until_clear(); |
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|
961 } |
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|
962 |
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963 // We can reach here if we were unsuccessul in scheduling a |
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964 // collection (because another thread beat us to it) or if we were |
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965 // stalled due to the GC locker. In either can we should retry the |
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966 // allocation attempt in case another thread successfully |
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967 // performed a collection and reclaimed enough space. We do the |
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968 // first attempt (without holding the Heap_lock) here and the |
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969 // follow-on attempt will be at the start of the next loop |
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970 // iteration (after taking the Heap_lock). |
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971 result = _mutator_alloc_region.attempt_allocation(word_size, |
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|
972 false /* bot_updates */); |
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|
973 if (result != NULL ){ |
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|
974 return result; |
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|
975 } |
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|
976 |
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|
977 // Give a warning if we seem to be looping forever. |
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978 if ((QueuedAllocationWarningCount > 0) && |
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|
979 (try_count % QueuedAllocationWarningCount == 0)) { |
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980 warning("G1CollectedHeap::attempt_allocation_slow() " |
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981 "retries %d times", try_count); |
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|
982 } |
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|
983 } |
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|
984 |
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|
985 ShouldNotReachHere(); |
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|
986 return NULL; |
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|
987 } |
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|
988 |
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|
989 HeapWord* G1CollectedHeap::attempt_allocation_humongous(size_t word_size, |
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990 unsigned int * gc_count_before_ret) { |
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991 // The structure of this method has a lot of similarities to |
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|
992 // attempt_allocation_slow(). The reason these two were not merged |
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993 // into a single one is that such a method would require several "if |
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994 // allocation is not humongous do this, otherwise do that" |
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|
995 // conditional paths which would obscure its flow. In fact, an early |
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996 // version of this code did use a unified method which was harder to |
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|
997 // follow and, as a result, it had subtle bugs that were hard to |
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998 // track down. So keeping these two methods separate allows each to |
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999 // be more readable. It will be good to keep these two in sync as |
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|
1000 // much as possible. |
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|
1001 |
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|
1002 assert_heap_not_locked_and_not_at_safepoint(); |
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1003 assert(isHumongous(word_size), "attempt_allocation_humongous() " |
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1004 "should only be called for humongous allocations"); |
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|
1005 |
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|
1006 // We will loop until a) we manage to successfully perform the |
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|
1007 // allocation or b) we successfully schedule a collection which |
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|
1008 // fails to perform the allocation. b) is the only case when we'll |
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|
1009 // return NULL. |
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|
1010 HeapWord* result = NULL; |
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1011 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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1012 bool should_try_gc; |
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|
1013 unsigned int gc_count_before; |
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|
1014 |
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|
1015 { |
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|
1016 MutexLockerEx x(Heap_lock); |
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|
1017 |
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1018 // Given that humongous objects are not allocated in young |
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1019 // regions, we'll first try to do the allocation without doing a |
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1020 // collection hoping that there's enough space in the heap. |
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1021 result = humongous_obj_allocate(word_size); |
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|
1022 if (result != NULL) { |
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|
1023 return result; |
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|
1024 } |
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|
1025 |
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1026 if (GC_locker::is_active_and_needs_gc()) { |
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1027 should_try_gc = false; |
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|
1028 } else { |
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1029 // Read the GC count while still holding the Heap_lock. |
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1030 gc_count_before = SharedHeap::heap()->total_collections(); |
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1031 should_try_gc = true; |
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|
1032 } |
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|
1033 } |
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|
1034 |
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1035 if (should_try_gc) { |
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1036 // If we failed to allocate the humongous object, we should try to |
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1037 // do a collection pause (if we're allowed) in case it reclaims |
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1038 // enough space for the allocation to succeed after the pause. |
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1039 |
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1040 bool succeeded; |
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1041 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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1042 if (result != NULL) { |
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1043 assert(succeeded, "only way to get back a non-NULL result"); |
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1044 return result; |
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1045 } |
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1046 |
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1047 if (succeeded) { |
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1048 // If we get here we successfully scheduled a collection which |
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1049 // failed to allocate. No point in trying to allocate |
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1050 // further. We'll just return NULL. |
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1051 MutexLockerEx x(Heap_lock); |
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1052 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
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1053 return NULL; |
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1054 } |
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1055 } else { |
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1056 GC_locker::stall_until_clear(); |
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1057 } |
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1058 |
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1059 // We can reach here if we were unsuccessul in scheduling a |
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1060 // collection (because another thread beat us to it) or if we were |
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1061 // stalled due to the GC locker. In either can we should retry the |
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1062 // allocation attempt in case another thread successfully |
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1063 // performed a collection and reclaimed enough space. Give a |
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1064 // warning if we seem to be looping forever. |
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1065 |
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1066 if ((QueuedAllocationWarningCount > 0) && |
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1067 (try_count % QueuedAllocationWarningCount == 0)) { |
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1068 warning("G1CollectedHeap::attempt_allocation_humongous() " |
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1069 "retries %d times", try_count); |
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1070 } |
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1071 } |
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1072 |
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1073 ShouldNotReachHere(); |
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1074 return NULL; |
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1075 } |
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1076 |
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1077 HeapWord* G1CollectedHeap::attempt_allocation_at_safepoint(size_t word_size, |
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1078 bool expect_null_mutator_alloc_region) { |
2152 | 1079 assert_at_safepoint(true /* should_be_vm_thread */); |
2433
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1080 assert(_mutator_alloc_region.get() == NULL || |
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1081 !expect_null_mutator_alloc_region, |
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1082 "the current alloc region was unexpectedly found to be non-NULL"); |
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1083 |
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1084 if (!isHumongous(word_size)) { |
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1085 return _mutator_alloc_region.attempt_allocation_locked(word_size, |
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1086 false /* bot_updates */); |
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1087 } else { |
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1088 return humongous_obj_allocate(word_size); |
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1089 } |
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1090 |
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1091 ShouldNotReachHere(); |
342 | 1092 } |
1093 | |
636 | 1094 void G1CollectedHeap::abandon_gc_alloc_regions() { |
1095 // first, make sure that the GC alloc region list is empty (it should!) | |
1096 assert(_gc_alloc_region_list == NULL, "invariant"); | |
1097 release_gc_alloc_regions(true /* totally */); | |
1098 } | |
1099 | |
342 | 1100 class PostMCRemSetClearClosure: public HeapRegionClosure { |
1101 ModRefBarrierSet* _mr_bs; | |
1102 public: | |
1103 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
1104 bool doHeapRegion(HeapRegion* r) { | |
1105 r->reset_gc_time_stamp(); | |
1106 if (r->continuesHumongous()) | |
1107 return false; | |
1108 HeapRegionRemSet* hrrs = r->rem_set(); | |
1109 if (hrrs != NULL) hrrs->clear(); | |
1110 // You might think here that we could clear just the cards | |
1111 // corresponding to the used region. But no: if we leave a dirty card | |
1112 // in a region we might allocate into, then it would prevent that card | |
1113 // from being enqueued, and cause it to be missed. | |
1114 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
1115 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
1116 return false; | |
1117 } | |
1118 }; | |
1119 | |
1120 | |
1121 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
1122 ModRefBarrierSet* _mr_bs; | |
1123 public: | |
1124 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
1125 bool doHeapRegion(HeapRegion* r) { | |
1126 if (r->continuesHumongous()) return false; | |
1127 if (r->used_region().word_size() != 0) { | |
1128 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
1129 } | |
1130 return false; | |
1131 } | |
1132 }; | |
1133 | |
626
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1134 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
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1135 G1CollectedHeap* _g1h; |
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1136 UpdateRSOopClosure _cl; |
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1137 int _worker_i; |
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1138 public: |
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1139 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
1861 | 1140 _cl(g1->g1_rem_set(), worker_i), |
626
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1141 _worker_i(worker_i), |
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1142 _g1h(g1) |
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1143 { } |
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1144 |
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1145 bool doHeapRegion(HeapRegion* r) { |
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1146 if (!r->continuesHumongous()) { |
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1147 _cl.set_from(r); |
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1148 r->oop_iterate(&_cl); |
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1149 } |
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1150 return false; |
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1151 } |
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1152 }; |
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1153 |
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1154 class ParRebuildRSTask: public AbstractGangTask { |
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1155 G1CollectedHeap* _g1; |
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1156 public: |
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1157 ParRebuildRSTask(G1CollectedHeap* g1) |
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1158 : AbstractGangTask("ParRebuildRSTask"), |
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1159 _g1(g1) |
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1160 { } |
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1161 |
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1162 void work(int i) { |
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1163 RebuildRSOutOfRegionClosure rebuild_rs(_g1, i); |
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1164 _g1->heap_region_par_iterate_chunked(&rebuild_rs, i, |
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1165 HeapRegion::RebuildRSClaimValue); |
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1166 } |
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1167 }; |
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1168 |
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1169 class PostCompactionPrinterClosure: public HeapRegionClosure { |
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1170 private: |
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1171 G1HRPrinter* _hr_printer; |
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1172 public: |
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1173 bool doHeapRegion(HeapRegion* hr) { |
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1174 assert(!hr->is_young(), "not expecting to find young regions"); |
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1175 // We only generate output for non-empty regions. |
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1176 if (!hr->is_empty()) { |
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1177 if (!hr->isHumongous()) { |
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1178 _hr_printer->post_compaction(hr, G1HRPrinter::Old); |
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1179 } else if (hr->startsHumongous()) { |
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1180 if (hr->capacity() == (size_t) HeapRegion::GrainBytes) { |
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1181 // single humongous region |
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1182 _hr_printer->post_compaction(hr, G1HRPrinter::SingleHumongous); |
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1183 } else { |
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1184 _hr_printer->post_compaction(hr, G1HRPrinter::StartsHumongous); |
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1185 } |
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1186 } else { |
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1187 assert(hr->continuesHumongous(), "only way to get here"); |
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1188 _hr_printer->post_compaction(hr, G1HRPrinter::ContinuesHumongous); |
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1189 } |
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1190 } |
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1191 return false; |
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1192 } |
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1193 |
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1194 PostCompactionPrinterClosure(G1HRPrinter* hr_printer) |
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1195 : _hr_printer(hr_printer) { } |
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1196 }; |
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1197 |
1973 | 1198 bool G1CollectedHeap::do_collection(bool explicit_gc, |
1656
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1199 bool clear_all_soft_refs, |
342 | 1200 size_t word_size) { |
2152 | 1201 assert_at_safepoint(true /* should_be_vm_thread */); |
1202 | |
1359
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1203 if (GC_locker::check_active_before_gc()) { |
1973 | 1204 return false; |
1359
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1205 } |
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1206 |
2125
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1207 SvcGCMarker sgcm(SvcGCMarker::FULL); |
342 | 1208 ResourceMark rm; |
1209 | |
838
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1210 if (PrintHeapAtGC) { |
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1211 Universe::print_heap_before_gc(); |
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1212 } |
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1213 |
2152 | 1214 verify_region_sets_optional(); |
342 | 1215 |
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1216 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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1217 collector_policy()->should_clear_all_soft_refs(); |
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1218 |
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1219 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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1220 |
342 | 1221 { |
1222 IsGCActiveMark x; | |
1223 | |
1224 // Timing | |
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1225 bool system_gc = (gc_cause() == GCCause::_java_lang_system_gc); |
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1226 assert(!system_gc || explicit_gc, "invariant"); |
342 | 1227 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
1228 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
1656
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1229 TraceTime t(system_gc ? "Full GC (System.gc())" : "Full GC", |
1387
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1230 PrintGC, true, gclog_or_tty); |
342 | 1231 |
3289
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1232 TraceCollectorStats tcs(g1mm()->full_collection_counters()); |
3356
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1233 TraceMemoryManagerStats tms(true /* fullGC */, gc_cause()); |
1089
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1234 |
342 | 1235 double start = os::elapsedTime(); |
1236 g1_policy()->record_full_collection_start(); | |
1237 | |
2152 | 1238 wait_while_free_regions_coming(); |
2361 | 1239 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 1240 |
342 | 1241 gc_prologue(true); |
838
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1242 increment_total_collections(true /* full gc */); |
342 | 1243 |
1244 size_t g1h_prev_used = used(); | |
1245 assert(used() == recalculate_used(), "Should be equal"); | |
1246 | |
1247 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
1248 HandleMark hm; // Discard invalid handles created during verification | |
2433
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1249 gclog_or_tty->print(" VerifyBeforeGC:"); |
342 | 1250 prepare_for_verify(); |
3772
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1251 Universe::verify(/* allow dirty */ true, |
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1252 /* silent */ false, |
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1253 /* option */ VerifyOption_G1UsePrevMarking); |
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1254 |
342 | 1255 } |
1256 | |
1257 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
1258 | |
1259 // We want to discover references, but not process them yet. | |
1260 // This mode is disabled in | |
1261 // instanceRefKlass::process_discovered_references if the | |
1262 // generation does some collection work, or | |
1263 // instanceRefKlass::enqueue_discovered_references if the | |
1264 // generation returns without doing any work. | |
1265 ref_processor()->disable_discovery(); | |
1266 ref_processor()->abandon_partial_discovery(); | |
1267 ref_processor()->verify_no_references_recorded(); | |
1268 | |
1269 // Abandon current iterations of concurrent marking and concurrent | |
1270 // refinement, if any are in progress. | |
1271 concurrent_mark()->abort(); | |
1272 | |
1273 // Make sure we'll choose a new allocation region afterwards. | |
2433
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1274 release_mutator_alloc_region(); |
636 | 1275 abandon_gc_alloc_regions(); |
1861 | 1276 g1_rem_set()->cleanupHRRS(); |
342 | 1277 tear_down_region_lists(); |
1394
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1278 |
3778
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1279 // We should call this after we retire any currently active alloc |
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1280 // regions so that all the ALLOC / RETIRE events are generated |
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1281 // before the start GC event. |
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1282 _hr_printer.start_gc(true /* full */, (size_t) total_collections()); |
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1283 |
1394
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|
1284 // We may have added regions to the current incremental collection |
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1285 // set between the last GC or pause and now. We need to clear the |
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|
1286 // incremental collection set and then start rebuilding it afresh |
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|
1287 // after this full GC. |
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|
1288 abandon_collection_set(g1_policy()->inc_cset_head()); |
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|
1289 g1_policy()->clear_incremental_cset(); |
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|
1290 g1_policy()->stop_incremental_cset_building(); |
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|
1291 |
342 | 1292 if (g1_policy()->in_young_gc_mode()) { |
1293 empty_young_list(); | |
1294 g1_policy()->set_full_young_gcs(true); | |
1295 } | |
1296 | |
1974
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diff
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|
1297 // See the comment in G1CollectedHeap::ref_processing_init() about |
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diff
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|
1298 // how reference processing currently works in G1. |
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|
1299 |
342 | 1300 // Temporarily make reference _discovery_ single threaded (non-MT). |
2369
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diff
changeset
|
1301 ReferenceProcessorMTDiscoveryMutator rp_disc_ser(ref_processor(), false); |
342 | 1302 |
1303 // Temporarily make refs discovery atomic | |
1304 ReferenceProcessorAtomicMutator rp_disc_atomic(ref_processor(), true); | |
1305 | |
1306 // Temporarily clear _is_alive_non_header | |
1307 ReferenceProcessorIsAliveMutator rp_is_alive_null(ref_processor(), NULL); | |
1308 | |
1309 ref_processor()->enable_discovery(); | |
1387
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|
1310 ref_processor()->setup_policy(do_clear_all_soft_refs); |
342 | 1311 // Do collection work |
1312 { | |
1313 HandleMark hm; // Discard invalid handles created during gc | |
1387
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|
1314 G1MarkSweep::invoke_at_safepoint(ref_processor(), do_clear_all_soft_refs); |
342 | 1315 } |
2152 | 1316 assert(free_regions() == 0, "we should not have added any free regions"); |
342 | 1317 rebuild_region_lists(); |
1318 | |
1319 _summary_bytes_used = recalculate_used(); | |
1320 | |
1321 ref_processor()->enqueue_discovered_references(); | |
1322 | |
1323 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
1324 | |
1089
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|
1325 MemoryService::track_memory_usage(); |
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|
1326 |
342 | 1327 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
1328 HandleMark hm; // Discard invalid handles created during verification | |
1329 gclog_or_tty->print(" VerifyAfterGC:"); | |
637
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
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diff
changeset
|
1330 prepare_for_verify(); |
3772
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|
1331 Universe::verify(/* allow dirty */ false, |
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|
1332 /* silent */ false, |
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|
1333 /* option */ VerifyOption_G1UsePrevMarking); |
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|
1334 |
342 | 1335 } |
1336 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); | |
1337 | |
1338 reset_gc_time_stamp(); | |
1339 // Since everything potentially moved, we will clear all remembered | |
626
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|
1340 // sets, and clear all cards. Later we will rebuild remebered |
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|
1341 // sets. We will also reset the GC time stamps of the regions. |
342 | 1342 PostMCRemSetClearClosure rs_clear(mr_bs()); |
1343 heap_region_iterate(&rs_clear); | |
1344 | |
1345 // Resize the heap if necessary. | |
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|
1346 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
342 | 1347 |
3778
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1348 if (_hr_printer.is_active()) { |
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|
1349 // We should do this after we potentially resize the heap so |
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|
1350 // that all the COMMIT / UNCOMMIT events are generated before |
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|
1351 // the end GC event. |
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|
1352 |
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|
1353 PostCompactionPrinterClosure cl(hr_printer()); |
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|
1354 heap_region_iterate(&cl); |
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|
1355 |
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|
1356 _hr_printer.end_gc(true /* full */, (size_t) total_collections()); |
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1357 } |
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|
1358 |
342 | 1359 if (_cg1r->use_cache()) { |
1360 _cg1r->clear_and_record_card_counts(); | |
1361 _cg1r->clear_hot_cache(); | |
1362 } | |
1363 | |
626
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|
1364 // Rebuild remembered sets of all regions. |
1833
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|
1365 |
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|
1366 if (G1CollectedHeap::use_parallel_gc_threads()) { |
626
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|
1367 ParRebuildRSTask rebuild_rs_task(this); |
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|
1368 assert(check_heap_region_claim_values( |
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|
1369 HeapRegion::InitialClaimValue), "sanity check"); |
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|
1370 set_par_threads(workers()->total_workers()); |
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|
1371 workers()->run_task(&rebuild_rs_task); |
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|
1372 set_par_threads(0); |
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|
1373 assert(check_heap_region_claim_values( |
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|
1374 HeapRegion::RebuildRSClaimValue), "sanity check"); |
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|
1375 reset_heap_region_claim_values(); |
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|
1376 } else { |
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|
1377 RebuildRSOutOfRegionClosure rebuild_rs(this); |
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|
1378 heap_region_iterate(&rebuild_rs); |
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|
1379 } |
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|
1380 |
342 | 1381 if (PrintGC) { |
1382 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
1383 } | |
1384 | |
1385 if (true) { // FIXME | |
1386 // Ask the permanent generation to adjust size for full collections | |
1387 perm()->compute_new_size(); | |
1388 } | |
1389 | |
1394
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1390 // Start a new incremental collection set for the next pause |
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|
1391 assert(g1_policy()->collection_set() == NULL, "must be"); |
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|
1392 g1_policy()->start_incremental_cset_building(); |
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|
1393 |
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|
1394 // Clear the _cset_fast_test bitmap in anticipation of adding |
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diff
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|
1395 // regions to the incremental collection set for the next |
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|
1396 // evacuation pause. |
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|
1397 clear_cset_fast_test(); |
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|
1398 |
2433
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|
1399 init_mutator_alloc_region(); |
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|
1400 |
342 | 1401 double end = os::elapsedTime(); |
1402 g1_policy()->record_full_collection_end(); | |
1403 | |
546
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1404 #ifdef TRACESPINNING |
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1405 ParallelTaskTerminator::print_termination_counts(); |
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1406 #endif |
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1407 |
342 | 1408 gc_epilogue(true); |
1409 | |
794 | 1410 // Discard all rset updates |
1411 JavaThread::dirty_card_queue_set().abandon_logs(); | |
616
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1412 assert(!G1DeferredRSUpdate |
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1413 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
342 | 1414 } |
1415 | |
1416 if (g1_policy()->in_young_gc_mode()) { | |
1417 _young_list->reset_sampled_info(); | |
1394
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1418 // At this point there should be no regions in the |
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1419 // entire heap tagged as young. |
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1420 assert( check_young_list_empty(true /* check_heap */), |
342 | 1421 "young list should be empty at this point"); |
1422 } | |
838
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1423 |
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1424 // Update the number of full collections that have been completed. |
2030
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1425 increment_full_collections_completed(false /* concurrent */); |
1656
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1426 |
3766 | 1427 _hrs.verify_optional(); |
2152 | 1428 verify_region_sets_optional(); |
1429 | |
838
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1430 if (PrintHeapAtGC) { |
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1431 Universe::print_heap_after_gc(); |
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1432 } |
3289
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1433 g1mm()->update_counters(); |
1973 | 1434 |
1435 return true; | |
342 | 1436 } |
1437 | |
1438 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
1973 | 1439 // do_collection() will return whether it succeeded in performing |
1440 // the GC. Currently, there is no facility on the | |
1441 // do_full_collection() API to notify the caller than the collection | |
1442 // did not succeed (e.g., because it was locked out by the GC | |
1443 // locker). So, right now, we'll ignore the return value. | |
1444 bool dummy = do_collection(true, /* explicit_gc */ | |
1445 clear_all_soft_refs, | |
1446 0 /* word_size */); | |
342 | 1447 } |
1448 | |
1449 // This code is mostly copied from TenuredGeneration. | |
1450 void | |
1451 G1CollectedHeap:: | |
1452 resize_if_necessary_after_full_collection(size_t word_size) { | |
1453 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
1454 | |
1455 // Include the current allocation, if any, and bytes that will be | |
1456 // pre-allocated to support collections, as "used". | |
1457 const size_t used_after_gc = used(); | |
1458 const size_t capacity_after_gc = capacity(); | |
1459 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
1460 | |
1717
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1461 // This is enforced in arguments.cpp. |
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1462 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
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1463 "otherwise the code below doesn't make sense"); |
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1464 |
342 | 1465 // We don't have floating point command-line arguments |
1717
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1466 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
342 | 1467 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
1717
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1468 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
342 | 1469 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
1470 | |
1717
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1471 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
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1472 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
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1473 |
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1474 // We have to be careful here as these two calculations can overflow |
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1475 // 32-bit size_t's. |
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1476 double used_after_gc_d = (double) used_after_gc; |
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1477 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
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1478 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
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1479 |
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1480 // Let's make sure that they are both under the max heap size, which |
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1481 // by default will make them fit into a size_t. |
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1482 double desired_capacity_upper_bound = (double) max_heap_size; |
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1483 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
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1484 desired_capacity_upper_bound); |
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1485 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
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1486 desired_capacity_upper_bound); |
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1487 |
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1488 // We can now safely turn them into size_t's. |
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1489 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
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1490 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
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1491 |
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1492 // This assert only makes sense here, before we adjust them |
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1493 // with respect to the min and max heap size. |
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1494 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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1495 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
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1496 "maximum_desired_capacity = "SIZE_FORMAT, |
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1497 minimum_desired_capacity, maximum_desired_capacity)); |
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|
1498 |
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|
1499 // Should not be greater than the heap max size. No need to adjust |
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1500 // it with respect to the heap min size as it's a lower bound (i.e., |
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1501 // we'll try to make the capacity larger than it, not smaller). |
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1502 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
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1503 // Should not be less than the heap min size. No need to adjust it |
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1504 // with respect to the heap max size as it's an upper bound (i.e., |
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1505 // we'll try to make the capacity smaller than it, not greater). |
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1506 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
342 | 1507 |
1508 if (PrintGC && Verbose) { | |
1717
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1509 const double free_percentage = |
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|
1510 (double) free_after_gc / (double) capacity_after_gc; |
342 | 1511 gclog_or_tty->print_cr("Computing new size after full GC "); |
1512 gclog_or_tty->print_cr(" " | |
1513 " minimum_free_percentage: %6.2f", | |
1514 minimum_free_percentage); | |
1515 gclog_or_tty->print_cr(" " | |
1516 " maximum_free_percentage: %6.2f", | |
1517 maximum_free_percentage); | |
1518 gclog_or_tty->print_cr(" " | |
1519 " capacity: %6.1fK" | |
1520 " minimum_desired_capacity: %6.1fK" | |
1521 " maximum_desired_capacity: %6.1fK", | |
1717
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|
1522 (double) capacity_after_gc / (double) K, |
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1523 (double) minimum_desired_capacity / (double) K, |
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|
1524 (double) maximum_desired_capacity / (double) K); |
342 | 1525 gclog_or_tty->print_cr(" " |
1717
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1526 " free_after_gc: %6.1fK" |
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1527 " used_after_gc: %6.1fK", |
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1528 (double) free_after_gc / (double) K, |
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|
1529 (double) used_after_gc / (double) K); |
342 | 1530 gclog_or_tty->print_cr(" " |
1531 " free_percentage: %6.2f", | |
1532 free_percentage); | |
1533 } | |
1717
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1534 if (capacity_after_gc < minimum_desired_capacity) { |
342 | 1535 // Don't expand unless it's significant |
1536 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
2188
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1537 if (expand(expand_bytes)) { |
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|
1538 if (PrintGC && Verbose) { |
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|
1539 gclog_or_tty->print_cr(" " |
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1540 " expanding:" |
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1541 " max_heap_size: %6.1fK" |
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1542 " minimum_desired_capacity: %6.1fK" |
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1543 " expand_bytes: %6.1fK", |
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1544 (double) max_heap_size / (double) K, |
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|
1545 (double) minimum_desired_capacity / (double) K, |
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1546 (double) expand_bytes / (double) K); |
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|
1547 } |
342 | 1548 } |
1549 | |
1550 // No expansion, now see if we want to shrink | |
1717
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1551 } else if (capacity_after_gc > maximum_desired_capacity) { |
342 | 1552 // Capacity too large, compute shrinking size |
1553 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
1554 shrink(shrink_bytes); | |
1555 if (PrintGC && Verbose) { | |
1556 gclog_or_tty->print_cr(" " | |
1557 " shrinking:" | |
1717
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|
1558 " min_heap_size: %6.1fK" |
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1559 " maximum_desired_capacity: %6.1fK" |
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1560 " shrink_bytes: %6.1fK", |
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1561 (double) min_heap_size / (double) K, |
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1562 (double) maximum_desired_capacity / (double) K, |
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1563 (double) shrink_bytes / (double) K); |
342 | 1564 } |
1565 } | |
1566 } | |
1567 | |
1568 | |
1569 HeapWord* | |
1973 | 1570 G1CollectedHeap::satisfy_failed_allocation(size_t word_size, |
1571 bool* succeeded) { | |
2152 | 1572 assert_at_safepoint(true /* should_be_vm_thread */); |
1973 | 1573 |
1574 *succeeded = true; | |
1575 // Let's attempt the allocation first. | |
2433
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|
1576 HeapWord* result = |
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1577 attempt_allocation_at_safepoint(word_size, |
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1578 false /* expect_null_mutator_alloc_region */); |
1973 | 1579 if (result != NULL) { |
1580 assert(*succeeded, "sanity"); | |
1581 return result; | |
1582 } | |
342 | 1583 |
1584 // In a G1 heap, we're supposed to keep allocation from failing by | |
1585 // incremental pauses. Therefore, at least for now, we'll favor | |
1586 // expansion over collection. (This might change in the future if we can | |
1587 // do something smarter than full collection to satisfy a failed alloc.) | |
1588 result = expand_and_allocate(word_size); | |
1589 if (result != NULL) { | |
1973 | 1590 assert(*succeeded, "sanity"); |
342 | 1591 return result; |
1592 } | |
1593 | |
1973 | 1594 // Expansion didn't work, we'll try to do a Full GC. |
1595 bool gc_succeeded = do_collection(false, /* explicit_gc */ | |
1596 false, /* clear_all_soft_refs */ | |
1597 word_size); | |
1598 if (!gc_succeeded) { | |
1599 *succeeded = false; | |
1600 return NULL; | |
1601 } | |
1602 | |
1603 // Retry the allocation | |
1604 result = attempt_allocation_at_safepoint(word_size, | |
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1605 true /* expect_null_mutator_alloc_region */); |
342 | 1606 if (result != NULL) { |
1973 | 1607 assert(*succeeded, "sanity"); |
342 | 1608 return result; |
1609 } | |
1610 | |
1973 | 1611 // Then, try a Full GC that will collect all soft references. |
1612 gc_succeeded = do_collection(false, /* explicit_gc */ | |
1613 true, /* clear_all_soft_refs */ | |
1614 word_size); | |
1615 if (!gc_succeeded) { | |
1616 *succeeded = false; | |
1617 return NULL; | |
1618 } | |
1619 | |
1620 // Retry the allocation once more | |
1621 result = attempt_allocation_at_safepoint(word_size, | |
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1622 true /* expect_null_mutator_alloc_region */); |
342 | 1623 if (result != NULL) { |
1973 | 1624 assert(*succeeded, "sanity"); |
342 | 1625 return result; |
1626 } | |
1627 | |
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1628 assert(!collector_policy()->should_clear_all_soft_refs(), |
1973 | 1629 "Flag should have been handled and cleared prior to this point"); |
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1630 |
342 | 1631 // What else? We might try synchronous finalization later. If the total |
1632 // space available is large enough for the allocation, then a more | |
1633 // complete compaction phase than we've tried so far might be | |
1634 // appropriate. | |
1973 | 1635 assert(*succeeded, "sanity"); |
342 | 1636 return NULL; |
1637 } | |
1638 | |
1639 // Attempting to expand the heap sufficiently | |
1640 // to support an allocation of the given "word_size". If | |
1641 // successful, perform the allocation and return the address of the | |
1642 // allocated block, or else "NULL". | |
1643 | |
1644 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
2152 | 1645 assert_at_safepoint(true /* should_be_vm_thread */); |
1646 | |
1647 verify_region_sets_optional(); | |
1973 | 1648 |
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1649 size_t expand_bytes = MAX2(word_size * HeapWordSize, MinHeapDeltaBytes); |
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1650 if (expand(expand_bytes)) { |
3766 | 1651 _hrs.verify_optional(); |
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1652 verify_region_sets_optional(); |
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1653 return attempt_allocation_at_safepoint(word_size, |
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1654 false /* expect_null_mutator_alloc_region */); |
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1655 } |
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1656 return NULL; |
342 | 1657 } |
1658 | |
3766 | 1659 void G1CollectedHeap::update_committed_space(HeapWord* old_end, |
1660 HeapWord* new_end) { | |
1661 assert(old_end != new_end, "don't call this otherwise"); | |
1662 assert((HeapWord*) _g1_storage.high() == new_end, "invariant"); | |
1663 | |
1664 // Update the committed mem region. | |
1665 _g1_committed.set_end(new_end); | |
1666 // Tell the card table about the update. | |
1667 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
1668 // Tell the BOT about the update. | |
1669 _bot_shared->resize(_g1_committed.word_size()); | |
1670 } | |
1671 | |
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1672 bool G1CollectedHeap::expand(size_t expand_bytes) { |
342 | 1673 size_t old_mem_size = _g1_storage.committed_size(); |
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1674 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
342 | 1675 aligned_expand_bytes = align_size_up(aligned_expand_bytes, |
1676 HeapRegion::GrainBytes); | |
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1677 |
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1678 if (Verbose && PrintGC) { |
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1679 gclog_or_tty->print("Expanding garbage-first heap from %ldK by %ldK", |
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1680 old_mem_size/K, aligned_expand_bytes/K); |
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1681 } |
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1682 |
3766 | 1683 // First commit the memory. |
1684 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
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1685 bool successful = _g1_storage.expand_by(aligned_expand_bytes); |
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1686 if (successful) { |
3766 | 1687 // Then propagate this update to the necessary data structures. |
1688 HeapWord* new_end = (HeapWord*) _g1_storage.high(); | |
1689 update_committed_space(old_end, new_end); | |
1690 | |
1691 FreeRegionList expansion_list("Local Expansion List"); | |
1692 MemRegion mr = _hrs.expand_by(old_end, new_end, &expansion_list); | |
1693 assert(mr.start() == old_end, "post-condition"); | |
1694 // mr might be a smaller region than what was requested if | |
1695 // expand_by() was unable to allocate the HeapRegion instances | |
1696 assert(mr.end() <= new_end, "post-condition"); | |
1697 | |
1698 size_t actual_expand_bytes = mr.byte_size(); | |
1699 assert(actual_expand_bytes <= aligned_expand_bytes, "post-condition"); | |
1700 assert(actual_expand_bytes == expansion_list.total_capacity_bytes(), | |
1701 "post-condition"); | |
1702 if (actual_expand_bytes < aligned_expand_bytes) { | |
1703 // We could not expand _hrs to the desired size. In this case we | |
1704 // need to shrink the committed space accordingly. | |
1705 assert(mr.end() < new_end, "invariant"); | |
1706 | |
1707 size_t diff_bytes = aligned_expand_bytes - actual_expand_bytes; | |
1708 // First uncommit the memory. | |
1709 _g1_storage.shrink_by(diff_bytes); | |
1710 // Then propagate this update to the necessary data structures. | |
1711 update_committed_space(new_end, mr.end()); | |
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1712 } |
3766 | 1713 _free_list.add_as_tail(&expansion_list); |
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1714 |
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1715 if (_hr_printer.is_active()) { |
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1716 HeapWord* curr = mr.start(); |
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1717 while (curr < mr.end()) { |
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1718 HeapWord* curr_end = curr + HeapRegion::GrainWords; |
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1719 _hr_printer.commit(curr, curr_end); |
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1720 curr = curr_end; |
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1721 } |
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1722 assert(curr == mr.end(), "post-condition"); |
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1723 } |
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1724 } else { |
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1725 // The expansion of the virtual storage space was unsuccessful. |
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1726 // Let's see if it was because we ran out of swap. |
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1727 if (G1ExitOnExpansionFailure && |
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1728 _g1_storage.uncommitted_size() >= aligned_expand_bytes) { |
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1729 // We had head room... |
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1730 vm_exit_out_of_memory(aligned_expand_bytes, "G1 heap expansion"); |
342 | 1731 } |
1732 } | |
2152 | 1733 |
342 | 1734 if (Verbose && PrintGC) { |
1735 size_t new_mem_size = _g1_storage.committed_size(); | |
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1736 gclog_or_tty->print_cr("...%s, expanded to %ldK", |
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1737 (successful ? "Successful" : "Failed"), |
342 | 1738 new_mem_size/K); |
1739 } | |
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1740 return successful; |
342 | 1741 } |
1742 | |
3766 | 1743 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) { |
342 | 1744 size_t old_mem_size = _g1_storage.committed_size(); |
1745 size_t aligned_shrink_bytes = | |
1746 ReservedSpace::page_align_size_down(shrink_bytes); | |
1747 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
1748 HeapRegion::GrainBytes); | |
1749 size_t num_regions_deleted = 0; | |
3766 | 1750 MemRegion mr = _hrs.shrink_by(aligned_shrink_bytes, &num_regions_deleted); |
1751 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
1752 assert(mr.end() == old_end, "post-condition"); | |
1753 if (mr.byte_size() > 0) { | |
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1754 if (_hr_printer.is_active()) { |
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1755 HeapWord* curr = mr.end(); |
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1756 while (curr > mr.start()) { |
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1757 HeapWord* curr_end = curr; |
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1758 curr -= HeapRegion::GrainWords; |
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1759 _hr_printer.uncommit(curr, curr_end); |
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1760 } |
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1761 assert(curr == mr.start(), "post-condition"); |
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1762 } |
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1763 |
342 | 1764 _g1_storage.shrink_by(mr.byte_size()); |
3766 | 1765 HeapWord* new_end = (HeapWord*) _g1_storage.high(); |
1766 assert(mr.start() == new_end, "post-condition"); | |
1767 | |
1768 _expansion_regions += num_regions_deleted; | |
1769 update_committed_space(old_end, new_end); | |
1770 HeapRegionRemSet::shrink_heap(n_regions()); | |
1771 | |
1772 if (Verbose && PrintGC) { | |
1773 size_t new_mem_size = _g1_storage.committed_size(); | |
1774 gclog_or_tty->print_cr("Shrinking garbage-first heap from %ldK by %ldK to %ldK", | |
1775 old_mem_size/K, aligned_shrink_bytes/K, | |
1776 new_mem_size/K); | |
1777 } | |
342 | 1778 } |
1779 } | |
1780 | |
1781 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
2152 | 1782 verify_region_sets_optional(); |
1783 | |
636 | 1784 release_gc_alloc_regions(true /* totally */); |
2152 | 1785 // Instead of tearing down / rebuilding the free lists here, we |
1786 // could instead use the remove_all_pending() method on free_list to | |
1787 // remove only the ones that we need to remove. | |
342 | 1788 tear_down_region_lists(); // We will rebuild them in a moment. |
1789 shrink_helper(shrink_bytes); | |
1790 rebuild_region_lists(); | |
2152 | 1791 |
3766 | 1792 _hrs.verify_optional(); |
2152 | 1793 verify_region_sets_optional(); |
342 | 1794 } |
1795 | |
1796 // Public methods. | |
1797 | |
1798 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
1799 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
1800 #endif // _MSC_VER | |
1801 | |
1802 | |
1803 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
1804 SharedHeap(policy_), | |
1805 _g1_policy(policy_), | |
1111 | 1806 _dirty_card_queue_set(false), |
1705 | 1807 _into_cset_dirty_card_queue_set(false), |
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1808 _is_alive_closure(this), |
342 | 1809 _ref_processor(NULL), |
1810 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), | |
1811 _bot_shared(NULL), | |
1812 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
1813 _evac_failure_scan_stack(NULL) , | |
1814 _mark_in_progress(false), | |
2152 | 1815 _cg1r(NULL), _summary_bytes_used(0), |
342 | 1816 _refine_cte_cl(NULL), |
1817 _full_collection(false), | |
2152 | 1818 _free_list("Master Free List"), |
1819 _secondary_free_list("Secondary Free List"), | |
1820 _humongous_set("Master Humongous Set"), | |
1821 _free_regions_coming(false), | |
342 | 1822 _young_list(new YoungList(this)), |
1823 _gc_time_stamp(0), | |
526 | 1824 _surviving_young_words(NULL), |
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1825 _full_collections_completed(0), |
526 | 1826 _in_cset_fast_test(NULL), |
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1827 _in_cset_fast_test_base(NULL), |
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1828 _dirty_cards_region_list(NULL) { |
342 | 1829 _g1h = this; // To catch bugs. |
1830 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
1831 vm_exit_during_initialization("Failed necessary allocation."); | |
1832 } | |
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1833 |
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1834 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1835 |
342 | 1836 int n_queues = MAX2((int)ParallelGCThreads, 1); |
1837 _task_queues = new RefToScanQueueSet(n_queues); | |
1838 | |
1839 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
1840 assert(n_rem_sets > 0, "Invariant."); | |
1841 | |
1842 HeapRegionRemSetIterator** iter_arr = | |
1843 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
1844 for (int i = 0; i < n_queues; i++) { | |
1845 iter_arr[i] = new HeapRegionRemSetIterator(); | |
1846 } | |
1847 _rem_set_iterator = iter_arr; | |
1848 | |
1849 for (int i = 0; i < n_queues; i++) { | |
1850 RefToScanQueue* q = new RefToScanQueue(); | |
1851 q->initialize(); | |
1852 _task_queues->register_queue(i, q); | |
1853 } | |
1854 | |
1855 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
636 | 1856 _gc_alloc_regions[ap] = NULL; |
1857 _gc_alloc_region_counts[ap] = 0; | |
1858 _retained_gc_alloc_regions[ap] = NULL; | |
1859 // by default, we do not retain a GC alloc region for each ap; | |
1860 // we'll override this, when appropriate, below | |
1861 _retain_gc_alloc_region[ap] = false; | |
1862 } | |
1863 | |
1864 // We will try to remember the last half-full tenured region we | |
1865 // allocated to at the end of a collection so that we can re-use it | |
1866 // during the next collection. | |
1867 _retain_gc_alloc_region[GCAllocForTenured] = true; | |
1868 | |
342 | 1869 guarantee(_task_queues != NULL, "task_queues allocation failure."); |
1870 } | |
1871 | |
1872 jint G1CollectedHeap::initialize() { | |
1166 | 1873 CollectedHeap::pre_initialize(); |
342 | 1874 os::enable_vtime(); |
1875 | |
1876 // Necessary to satisfy locking discipline assertions. | |
1877 | |
1878 MutexLocker x(Heap_lock); | |
1879 | |
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1880 // We have to initialize the printer before committing the heap, as |
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1881 // it will be used then. |
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1882 _hr_printer.set_active(G1PrintHeapRegions); |
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1883 |
342 | 1884 // While there are no constraints in the GC code that HeapWordSize |
1885 // be any particular value, there are multiple other areas in the | |
1886 // system which believe this to be true (e.g. oop->object_size in some | |
1887 // cases incorrectly returns the size in wordSize units rather than | |
1888 // HeapWordSize). | |
1889 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
1890 | |
1891 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
1892 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
1893 | |
1894 // Ensure that the sizes are properly aligned. | |
1895 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1896 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1897 | |
1898 _cg1r = new ConcurrentG1Refine(); | |
1899 | |
1900 // Reserve the maximum. | |
1901 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
1902 // Includes the perm-gen. | |
642
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1903 |
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1904 const size_t total_reserved = max_byte_size + pgs->max_size(); |
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1905 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1906 |
342 | 1907 ReservedSpace heap_rs(max_byte_size + pgs->max_size(), |
1908 HeapRegion::GrainBytes, | |
2135
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1909 UseLargePages, addr); |
642
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1910 |
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1911 if (UseCompressedOops) { |
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1912 if (addr != NULL && !heap_rs.is_reserved()) { |
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1913 // Failed to reserve at specified address - the requested memory |
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1914 // region is taken already, for example, by 'java' launcher. |
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1915 // Try again to reserver heap higher. |
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1916 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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1917 ReservedSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1918 UseLargePages, addr); |
642
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1919 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1920 // Failed to reserve at specified address again - give up. |
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1921 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1922 assert(addr == NULL, ""); |
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1923 ReservedSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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1924 UseLargePages, addr); |
642
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1925 heap_rs = heap_rs1; |
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1926 } else { |
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1927 heap_rs = heap_rs0; |
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1928 } |
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1929 } |
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1930 } |
342 | 1931 |
1932 if (!heap_rs.is_reserved()) { | |
1933 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
1934 return JNI_ENOMEM; | |
1935 } | |
1936 | |
1937 // It is important to do this in a way such that concurrent readers can't | |
1938 // temporarily think somethings in the heap. (I've actually seen this | |
1939 // happen in asserts: DLD.) | |
1940 _reserved.set_word_size(0); | |
1941 _reserved.set_start((HeapWord*)heap_rs.base()); | |
1942 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
1943 | |
1944 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
1945 | |
1946 // Create the gen rem set (and barrier set) for the entire reserved region. | |
1947 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
1948 set_barrier_set(rem_set()->bs()); | |
1949 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
1950 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
1951 } else { | |
1952 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
1953 return JNI_ENOMEM; | |
1954 } | |
1955 | |
1956 // Also create a G1 rem set. | |
1861 | 1957 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { |
1958 _g1_rem_set = new G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
342 | 1959 } else { |
1861 | 1960 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); |
1961 return JNI_ENOMEM; | |
342 | 1962 } |
1963 | |
1964 // Carve out the G1 part of the heap. | |
1965 | |
1966 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
1967 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
1968 g1_rs.size()/HeapWordSize); | |
1969 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
1970 | |
1971 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
1972 | |
1973 _g1_storage.initialize(g1_rs, 0); | |
1974 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
3766 | 1975 _hrs.initialize((HeapWord*) _g1_reserved.start(), |
1976 (HeapWord*) _g1_reserved.end(), | |
1977 _expansion_regions); | |
342 | 1978 |
807
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1979 // 6843694 - ensure that the maximum region index can fit |
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1980 // in the remembered set structures. |
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1981 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
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1982 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
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1983 |
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1984 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
942
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1985 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
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1986 guarantee((size_t) HeapRegion::CardsPerRegion < max_cards_per_region, |
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1987 "too many cards per region"); |
807
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1988 |
2152 | 1989 HeapRegionSet::set_unrealistically_long_length(max_regions() + 1); |
1990 | |
342 | 1991 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
1992 heap_word_size(init_byte_size)); | |
1993 | |
1994 _g1h = this; | |
1995 | |
1394
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1996 _in_cset_fast_test_length = max_regions(); |
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1997 _in_cset_fast_test_base = NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); |
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1998 |
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1999 // We're biasing _in_cset_fast_test to avoid subtracting the |
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2000 // beginning of the heap every time we want to index; basically |
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2001 // it's the same with what we do with the card table. |
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2002 _in_cset_fast_test = _in_cset_fast_test_base - |
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2003 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
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2004 |
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2005 // Clear the _cset_fast_test bitmap in anticipation of adding |
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2006 // regions to the incremental collection set for the first |
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2007 // evacuation pause. |
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2008 clear_cset_fast_test(); |
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2009 |
342 | 2010 // Create the ConcurrentMark data structure and thread. |
2011 // (Must do this late, so that "max_regions" is defined.) | |
2012 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
2013 _cmThread = _cm->cmThread(); | |
2014 | |
2015 // Initialize the from_card cache structure of HeapRegionRemSet. | |
2016 HeapRegionRemSet::init_heap(max_regions()); | |
2017 | |
677 | 2018 // Now expand into the initial heap size. |
2188
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2019 if (!expand(init_byte_size)) { |
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2020 vm_exit_during_initialization("Failed to allocate initial heap."); |
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2021 return JNI_ENOMEM; |
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2022 } |
342 | 2023 |
2024 // Perform any initialization actions delegated to the policy. | |
2025 g1_policy()->init(); | |
2026 | |
2027 g1_policy()->note_start_of_mark_thread(); | |
2028 | |
2029 _refine_cte_cl = | |
2030 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
2031 g1_rem_set(), | |
2032 concurrent_g1_refine()); | |
2033 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
2034 | |
2035 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
2036 SATB_Q_FL_lock, | |
1111 | 2037 G1SATBProcessCompletedThreshold, |
342 | 2038 Shared_SATB_Q_lock); |
794 | 2039 |
2040 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
2041 DirtyCardQ_FL_lock, | |
1111 | 2042 concurrent_g1_refine()->yellow_zone(), |
2043 concurrent_g1_refine()->red_zone(), | |
794 | 2044 Shared_DirtyCardQ_lock); |
2045 | |
616
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2046 if (G1DeferredRSUpdate) { |
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2047 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
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2048 DirtyCardQ_FL_lock, |
1111 | 2049 -1, // never trigger processing |
2050 -1, // no limit on length | |
616
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2051 Shared_DirtyCardQ_lock, |
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2052 &JavaThread::dirty_card_queue_set()); |
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2053 } |
1705 | 2054 |
2055 // Initialize the card queue set used to hold cards containing | |
2056 // references into the collection set. | |
2057 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
2058 DirtyCardQ_FL_lock, | |
2059 -1, // never trigger processing | |
2060 -1, // no limit on length | |
2061 Shared_DirtyCardQ_lock, | |
2062 &JavaThread::dirty_card_queue_set()); | |
2063 | |
342 | 2064 // In case we're keeping closure specialization stats, initialize those |
2065 // counts and that mechanism. | |
2066 SpecializationStats::clear(); | |
2067 | |
2068 _gc_alloc_region_list = NULL; | |
2069 | |
2070 // Do later initialization work for concurrent refinement. | |
2071 _cg1r->init(); | |
2072 | |
2433
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2073 // Here we allocate the dummy full region that is required by the |
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2074 // G1AllocRegion class. If we don't pass an address in the reserved |
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2075 // space here, lots of asserts fire. |
3766 | 2076 |
2077 HeapRegion* dummy_region = new_heap_region(0 /* index of bottom region */, | |
2078 _g1_reserved.start()); | |
2433
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2079 // We'll re-use the same region whether the alloc region will |
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2080 // require BOT updates or not and, if it doesn't, then a non-young |
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2081 // region will complain that it cannot support allocations without |
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2082 // BOT updates. So we'll tag the dummy region as young to avoid that. |
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2083 dummy_region->set_young(); |
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2084 // Make sure it's full. |
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2085 dummy_region->set_top(dummy_region->end()); |
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2086 G1AllocRegion::setup(this, dummy_region); |
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2087 |
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2088 init_mutator_alloc_region(); |
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2089 |
3289
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2090 // Do create of the monitoring and management support so that |
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2091 // values in the heap have been properly initialized. |
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2092 _g1mm = new G1MonitoringSupport(this, &_g1_storage); |
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2093 |
342 | 2094 return JNI_OK; |
2095 } | |
2096 | |
2097 void G1CollectedHeap::ref_processing_init() { | |
1974
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2098 // Reference processing in G1 currently works as follows: |
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2099 // |
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2100 // * There is only one reference processor instance that |
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2101 // 'spans' the entire heap. It is created by the code |
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2102 // below. |
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2103 // * Reference discovery is not enabled during an incremental |
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2104 // pause (see 6484982). |
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2105 // * Discoverered refs are not enqueued nor are they processed |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2106 // during an incremental pause (see 6484982). |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2107 // * Reference discovery is enabled at initial marking. |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2108 // * Reference discovery is disabled and the discovered |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2109 // references processed etc during remarking. |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2110 // * Reference discovery is MT (see below). |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2111 // * Reference discovery requires a barrier (see below). |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2112 // * Reference processing is currently not MT (see 6608385). |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2113 // * A full GC enables (non-MT) reference discovery and |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2114 // processes any discovered references. |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2115 |
342 | 2116 SharedHeap::ref_processing_init(); |
2117 MemRegion mr = reserved_region(); | |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2361
diff
changeset
|
2118 _ref_processor = |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2361
diff
changeset
|
2119 new ReferenceProcessor(mr, // span |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2361
diff
changeset
|
2120 ParallelRefProcEnabled && (ParallelGCThreads > 1), // mt processing |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2361
diff
changeset
|
2121 (int) ParallelGCThreads, // degree of mt processing |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2361
diff
changeset
|
2122 ParallelGCThreads > 1 || ConcGCThreads > 1, // mt discovery |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2361
diff
changeset
|
2123 (int) MAX2(ParallelGCThreads, ConcGCThreads), // degree of mt discovery |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2361
diff
changeset
|
2124 false, // Reference discovery is not atomic |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2361
diff
changeset
|
2125 &_is_alive_closure, // is alive closure for efficiency |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2361
diff
changeset
|
2126 true); // Setting next fields of discovered |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2361
diff
changeset
|
2127 // lists requires a barrier. |
342 | 2128 } |
2129 | |
2130 size_t G1CollectedHeap::capacity() const { | |
2131 return _g1_committed.byte_size(); | |
2132 } | |
2133 | |
1705 | 2134 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
2135 DirtyCardQueue* into_cset_dcq, | |
2136 bool concurrent, | |
342 | 2137 int worker_i) { |
889 | 2138 // Clean cards in the hot card cache |
1705 | 2139 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set(), into_cset_dcq); |
889 | 2140 |
342 | 2141 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
2142 int n_completed_buffers = 0; | |
1705 | 2143 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
342 | 2144 n_completed_buffers++; |
2145 } | |
2146 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
2147 (double) n_completed_buffers); | |
2148 dcqs.clear_n_completed_buffers(); | |
2149 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
2150 } | |
2151 | |
2152 | |
2153 // Computes the sum of the storage used by the various regions. | |
2154 | |
2155 size_t G1CollectedHeap::used() const { | |
862
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
ysr
parents:
861
diff
changeset
|
2156 assert(Heap_lock->owner() != NULL, |
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
ysr
parents:
861
diff
changeset
|
2157 "Should be owned on this thread's behalf."); |
342 | 2158 size_t result = _summary_bytes_used; |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2159 // Read only once in case it is set to NULL concurrently |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2160 HeapRegion* hr = _mutator_alloc_region.get(); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2161 if (hr != NULL) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2162 result += hr->used(); |
342 | 2163 return result; |
2164 } | |
2165 | |
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2166 size_t G1CollectedHeap::used_unlocked() const { |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2167 size_t result = _summary_bytes_used; |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2168 return result; |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2169 } |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2170 |
342 | 2171 class SumUsedClosure: public HeapRegionClosure { |
2172 size_t _used; | |
2173 public: | |
2174 SumUsedClosure() : _used(0) {} | |
2175 bool doHeapRegion(HeapRegion* r) { | |
2176 if (!r->continuesHumongous()) { | |
2177 _used += r->used(); | |
2178 } | |
2179 return false; | |
2180 } | |
2181 size_t result() { return _used; } | |
2182 }; | |
2183 | |
2184 size_t G1CollectedHeap::recalculate_used() const { | |
2185 SumUsedClosure blk; | |
3766 | 2186 heap_region_iterate(&blk); |
342 | 2187 return blk.result(); |
2188 } | |
2189 | |
2190 #ifndef PRODUCT | |
2191 class SumUsedRegionsClosure: public HeapRegionClosure { | |
2192 size_t _num; | |
2193 public: | |
677 | 2194 SumUsedRegionsClosure() : _num(0) {} |
342 | 2195 bool doHeapRegion(HeapRegion* r) { |
2196 if (r->continuesHumongous() || r->used() > 0 || r->is_gc_alloc_region()) { | |
2197 _num += 1; | |
2198 } | |
2199 return false; | |
2200 } | |
2201 size_t result() { return _num; } | |
2202 }; | |
2203 | |
2204 size_t G1CollectedHeap::recalculate_used_regions() const { | |
2205 SumUsedRegionsClosure blk; | |
3766 | 2206 heap_region_iterate(&blk); |
342 | 2207 return blk.result(); |
2208 } | |
2209 #endif // PRODUCT | |
2210 | |
2211 size_t G1CollectedHeap::unsafe_max_alloc() { | |
2152 | 2212 if (free_regions() > 0) return HeapRegion::GrainBytes; |
342 | 2213 // otherwise, is there space in the current allocation region? |
2214 | |
2215 // We need to store the current allocation region in a local variable | |
2216 // here. The problem is that this method doesn't take any locks and | |
2217 // there may be other threads which overwrite the current allocation | |
2218 // region field. attempt_allocation(), for example, sets it to NULL | |
2219 // and this can happen *after* the NULL check here but before the call | |
2220 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
2221 // to be a problem in the optimized build, since the two loads of the | |
2222 // current allocation region field are optimized away. | |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2223 HeapRegion* hr = _mutator_alloc_region.get(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2224 if (hr == NULL) { |
342 | 2225 return 0; |
2226 } | |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2227 return hr->free(); |
342 | 2228 } |
2229 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2230 bool G1CollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2231 return |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2232 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2233 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2234 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2235 |
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2236 #ifndef PRODUCT |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2237 void G1CollectedHeap::allocate_dummy_regions() { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2238 // Let's fill up most of the region |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2239 size_t word_size = HeapRegion::GrainWords - 1024; |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2240 // And as a result the region we'll allocate will be humongous. |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2241 guarantee(isHumongous(word_size), "sanity"); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2242 |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2243 for (uintx i = 0; i < G1DummyRegionsPerGC; ++i) { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2244 // Let's use the existing mechanism for the allocation |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2245 HeapWord* dummy_obj = humongous_obj_allocate(word_size); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2246 if (dummy_obj != NULL) { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2247 MemRegion mr(dummy_obj, word_size); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2248 CollectedHeap::fill_with_object(mr); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2249 } else { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2250 // If we can't allocate once, we probably cannot allocate |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2251 // again. Let's get out of the loop. |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2252 break; |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2253 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2254 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2255 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2256 #endif // !PRODUCT |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2257 |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2258 void G1CollectedHeap::increment_full_collections_completed(bool concurrent) { |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2259 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2260 |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2261 // We assume that if concurrent == true, then the caller is a |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2262 // concurrent thread that was joined the Suspendible Thread |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2263 // Set. If there's ever a cheap way to check this, we should add an |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2264 // assert here. |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2265 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2266 // We have already incremented _total_full_collections at the start |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2267 // of the GC, so total_full_collections() represents how many full |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2268 // collections have been started. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2269 unsigned int full_collections_started = total_full_collections(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2270 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2271 // Given that this method is called at the end of a Full GC or of a |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2272 // concurrent cycle, and those can be nested (i.e., a Full GC can |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2273 // interrupt a concurrent cycle), the number of full collections |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2274 // completed should be either one (in the case where there was no |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2275 // nesting) or two (when a Full GC interrupted a concurrent cycle) |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2276 // behind the number of full collections started. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2277 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2278 // This is the case for the inner caller, i.e. a Full GC. |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2279 assert(concurrent || |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2280 (full_collections_started == _full_collections_completed + 1) || |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2281 (full_collections_started == _full_collections_completed + 2), |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2282 err_msg("for inner caller (Full GC): full_collections_started = %u " |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2283 "is inconsistent with _full_collections_completed = %u", |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2284 full_collections_started, _full_collections_completed)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2285 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2286 // This is the case for the outer caller, i.e. the concurrent cycle. |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2287 assert(!concurrent || |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2288 (full_collections_started == _full_collections_completed + 1), |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2289 err_msg("for outer caller (concurrent cycle): " |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2290 "full_collections_started = %u " |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2291 "is inconsistent with _full_collections_completed = %u", |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2292 full_collections_started, _full_collections_completed)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2293 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2294 _full_collections_completed += 1; |
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2295 |
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2296 // We need to clear the "in_progress" flag in the CM thread before |
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2297 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
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2298 // is set) so that if a waiter requests another System.gc() it doesn't |
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2299 // incorrectly see that a marking cyle is still in progress. |
2030
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2300 if (concurrent) { |
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2301 _cmThread->clear_in_progress(); |
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2302 } |
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2303 |
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2304 // This notify_all() will ensure that a thread that called |
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2305 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
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2306 // and it's waiting for a full GC to finish will be woken up. It is |
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2307 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
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2308 FullGCCount_lock->notify_all(); |
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2309 } |
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2310 |
342 | 2311 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
2152 | 2312 assert_at_safepoint(true /* should_be_vm_thread */); |
342 | 2313 GCCauseSetter gcs(this, cause); |
2314 switch (cause) { | |
2315 case GCCause::_heap_inspection: | |
2316 case GCCause::_heap_dump: { | |
2317 HandleMark hm; | |
2318 do_full_collection(false); // don't clear all soft refs | |
2319 break; | |
2320 } | |
2321 default: // XXX FIX ME | |
2322 ShouldNotReachHere(); // Unexpected use of this function | |
2323 } | |
2324 } | |
2325 | |
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2326 void G1CollectedHeap::collect(GCCause::Cause cause) { |
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2327 // The caller doesn't have the Heap_lock |
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2328 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
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2329 |
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2330 unsigned int gc_count_before; |
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2331 unsigned int full_gc_count_before; |
342 | 2332 { |
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2333 MutexLocker ml(Heap_lock); |
1973 | 2334 |
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2335 // Read the GC count while holding the Heap_lock |
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2336 gc_count_before = SharedHeap::heap()->total_collections(); |
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2337 full_gc_count_before = SharedHeap::heap()->total_full_collections(); |
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2338 } |
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2339 |
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2340 if (should_do_concurrent_full_gc(cause)) { |
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2341 // Schedule an initial-mark evacuation pause that will start a |
1973 | 2342 // concurrent cycle. We're setting word_size to 0 which means that |
2343 // we are not requesting a post-GC allocation. | |
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2344 VM_G1IncCollectionPause op(gc_count_before, |
1973 | 2345 0, /* word_size */ |
2346 true, /* should_initiate_conc_mark */ | |
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2347 g1_policy()->max_pause_time_ms(), |
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2348 cause); |
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2349 VMThread::execute(&op); |
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2350 } else { |
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2351 if (cause == GCCause::_gc_locker |
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2352 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
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2353 |
1973 | 2354 // Schedule a standard evacuation pause. We're setting word_size |
2355 // to 0 which means that we are not requesting a post-GC allocation. | |
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2356 VM_G1IncCollectionPause op(gc_count_before, |
1973 | 2357 0, /* word_size */ |
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2358 false, /* should_initiate_conc_mark */ |
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2359 g1_policy()->max_pause_time_ms(), |
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2360 cause); |
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2361 VMThread::execute(&op); |
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2362 } else { |
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2363 // Schedule a Full GC. |
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2364 VM_G1CollectFull op(gc_count_before, full_gc_count_before, cause); |
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2365 VMThread::execute(&op); |
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2366 } |
342 | 2367 } |
2368 } | |
2369 | |
2370 bool G1CollectedHeap::is_in(const void* p) const { | |
3766 | 2371 HeapRegion* hr = _hrs.addr_to_region((HeapWord*) p); |
2372 if (hr != NULL) { | |
342 | 2373 return hr->is_in(p); |
2374 } else { | |
2375 return _perm_gen->as_gen()->is_in(p); | |
2376 } | |
2377 } | |
2378 | |
2379 // Iteration functions. | |
2380 | |
2381 // Iterates an OopClosure over all ref-containing fields of objects | |
2382 // within a HeapRegion. | |
2383 | |
2384 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
2385 MemRegion _mr; | |
2386 OopClosure* _cl; | |
2387 public: | |
2388 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
2389 : _mr(mr), _cl(cl) {} | |
2390 bool doHeapRegion(HeapRegion* r) { | |
2391 if (! r->continuesHumongous()) { | |
2392 r->oop_iterate(_cl); | |
2393 } | |
2394 return false; | |
2395 } | |
2396 }; | |
2397 | |
678 | 2398 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
342 | 2399 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
3766 | 2400 heap_region_iterate(&blk); |
678 | 2401 if (do_perm) { |
2402 perm_gen()->oop_iterate(cl); | |
2403 } | |
342 | 2404 } |
2405 | |
678 | 2406 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
342 | 2407 IterateOopClosureRegionClosure blk(mr, cl); |
3766 | 2408 heap_region_iterate(&blk); |
678 | 2409 if (do_perm) { |
2410 perm_gen()->oop_iterate(cl); | |
2411 } | |
342 | 2412 } |
2413 | |
2414 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
2415 | |
2416 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
2417 ObjectClosure* _cl; | |
2418 public: | |
2419 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
2420 bool doHeapRegion(HeapRegion* r) { | |
2421 if (! r->continuesHumongous()) { | |
2422 r->object_iterate(_cl); | |
2423 } | |
2424 return false; | |
2425 } | |
2426 }; | |
2427 | |
678 | 2428 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
342 | 2429 IterateObjectClosureRegionClosure blk(cl); |
3766 | 2430 heap_region_iterate(&blk); |
678 | 2431 if (do_perm) { |
2432 perm_gen()->object_iterate(cl); | |
2433 } | |
342 | 2434 } |
2435 | |
2436 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
2437 // FIXME: is this right? | |
2438 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
2439 } | |
2440 | |
2441 // Calls a SpaceClosure on a HeapRegion. | |
2442 | |
2443 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
2444 SpaceClosure* _cl; | |
2445 public: | |
2446 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
2447 bool doHeapRegion(HeapRegion* r) { | |
2448 _cl->do_space(r); | |
2449 return false; | |
2450 } | |
2451 }; | |
2452 | |
2453 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
2454 SpaceClosureRegionClosure blk(cl); | |
3766 | 2455 heap_region_iterate(&blk); |
342 | 2456 } |
2457 | |
3766 | 2458 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const { |
2459 _hrs.iterate(cl); | |
342 | 2460 } |
2461 | |
2462 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
3766 | 2463 HeapRegionClosure* cl) const { |
2464 _hrs.iterate_from(r, cl); | |
342 | 2465 } |
2466 | |
2467 void | |
2468 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
2469 int worker, | |
2470 jint claim_value) { | |
355 | 2471 const size_t regions = n_regions(); |
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2472 const size_t worker_num = (G1CollectedHeap::use_parallel_gc_threads() ? ParallelGCThreads : 1); |
355 | 2473 // try to spread out the starting points of the workers |
2474 const size_t start_index = regions / worker_num * (size_t) worker; | |
2475 | |
2476 // each worker will actually look at all regions | |
2477 for (size_t count = 0; count < regions; ++count) { | |
2478 const size_t index = (start_index + count) % regions; | |
2479 assert(0 <= index && index < regions, "sanity"); | |
2480 HeapRegion* r = region_at(index); | |
2481 // we'll ignore "continues humongous" regions (we'll process them | |
2482 // when we come across their corresponding "start humongous" | |
2483 // region) and regions already claimed | |
2484 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
2485 continue; | |
2486 } | |
2487 // OK, try to claim it | |
342 | 2488 if (r->claimHeapRegion(claim_value)) { |
355 | 2489 // success! |
2490 assert(!r->continuesHumongous(), "sanity"); | |
2491 if (r->startsHumongous()) { | |
2492 // If the region is "starts humongous" we'll iterate over its | |
2493 // "continues humongous" first; in fact we'll do them | |
2494 // first. The order is important. In on case, calling the | |
2495 // closure on the "starts humongous" region might de-allocate | |
2496 // and clear all its "continues humongous" regions and, as a | |
2497 // result, we might end up processing them twice. So, we'll do | |
2498 // them first (notice: most closures will ignore them anyway) and | |
2499 // then we'll do the "starts humongous" region. | |
2500 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
2501 HeapRegion* chr = region_at(ch_index); | |
2502 | |
2503 // if the region has already been claimed or it's not | |
2504 // "continues humongous" we're done | |
2505 if (chr->claim_value() == claim_value || | |
2506 !chr->continuesHumongous()) { | |
2507 break; | |
2508 } | |
2509 | |
2510 // Noone should have claimed it directly. We can given | |
2511 // that we claimed its "starts humongous" region. | |
2512 assert(chr->claim_value() != claim_value, "sanity"); | |
2513 assert(chr->humongous_start_region() == r, "sanity"); | |
2514 | |
2515 if (chr->claimHeapRegion(claim_value)) { | |
2516 // we should always be able to claim it; noone else should | |
2517 // be trying to claim this region | |
2518 | |
2519 bool res2 = cl->doHeapRegion(chr); | |
2520 assert(!res2, "Should not abort"); | |
2521 | |
2522 // Right now, this holds (i.e., no closure that actually | |
2523 // does something with "continues humongous" regions | |
2524 // clears them). We might have to weaken it in the future, | |
2525 // but let's leave these two asserts here for extra safety. | |
2526 assert(chr->continuesHumongous(), "should still be the case"); | |
2527 assert(chr->humongous_start_region() == r, "sanity"); | |
2528 } else { | |
2529 guarantee(false, "we should not reach here"); | |
2530 } | |
2531 } | |
2532 } | |
2533 | |
2534 assert(!r->continuesHumongous(), "sanity"); | |
2535 bool res = cl->doHeapRegion(r); | |
2536 assert(!res, "Should not abort"); | |
2537 } | |
2538 } | |
2539 } | |
2540 | |
390 | 2541 class ResetClaimValuesClosure: public HeapRegionClosure { |
2542 public: | |
2543 bool doHeapRegion(HeapRegion* r) { | |
2544 r->set_claim_value(HeapRegion::InitialClaimValue); | |
2545 return false; | |
2546 } | |
2547 }; | |
2548 | |
2549 void | |
2550 G1CollectedHeap::reset_heap_region_claim_values() { | |
2551 ResetClaimValuesClosure blk; | |
2552 heap_region_iterate(&blk); | |
2553 } | |
2554 | |
355 | 2555 #ifdef ASSERT |
2556 // This checks whether all regions in the heap have the correct claim | |
2557 // value. I also piggy-backed on this a check to ensure that the | |
2558 // humongous_start_region() information on "continues humongous" | |
2559 // regions is correct. | |
2560 | |
2561 class CheckClaimValuesClosure : public HeapRegionClosure { | |
2562 private: | |
2563 jint _claim_value; | |
2564 size_t _failures; | |
2565 HeapRegion* _sh_region; | |
2566 public: | |
2567 CheckClaimValuesClosure(jint claim_value) : | |
2568 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
2569 bool doHeapRegion(HeapRegion* r) { | |
2570 if (r->claim_value() != _claim_value) { | |
2571 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
2572 "claim value = %d, should be %d", | |
2573 r->bottom(), r->end(), r->claim_value(), | |
2574 _claim_value); | |
2575 ++_failures; | |
2576 } | |
2577 if (!r->isHumongous()) { | |
2578 _sh_region = NULL; | |
2579 } else if (r->startsHumongous()) { | |
2580 _sh_region = r; | |
2581 } else if (r->continuesHumongous()) { | |
2582 if (r->humongous_start_region() != _sh_region) { | |
2583 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
2584 "HS = "PTR_FORMAT", should be "PTR_FORMAT, | |
2585 r->bottom(), r->end(), | |
2586 r->humongous_start_region(), | |
2587 _sh_region); | |
2588 ++_failures; | |
342 | 2589 } |
2590 } | |
355 | 2591 return false; |
2592 } | |
2593 size_t failures() { | |
2594 return _failures; | |
2595 } | |
2596 }; | |
2597 | |
2598 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
2599 CheckClaimValuesClosure cl(claim_value); | |
2600 heap_region_iterate(&cl); | |
2601 return cl.failures() == 0; | |
2602 } | |
2603 #endif // ASSERT | |
342 | 2604 |
2605 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { | |
2606 HeapRegion* r = g1_policy()->collection_set(); | |
2607 while (r != NULL) { | |
2608 HeapRegion* next = r->next_in_collection_set(); | |
2609 if (cl->doHeapRegion(r)) { | |
2610 cl->incomplete(); | |
2611 return; | |
2612 } | |
2613 r = next; | |
2614 } | |
2615 } | |
2616 | |
2617 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
2618 HeapRegionClosure *cl) { | |
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2619 if (r == NULL) { |
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2620 // The CSet is empty so there's nothing to do. |
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2621 return; |
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|
2622 } |
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2623 |
342 | 2624 assert(r->in_collection_set(), |
2625 "Start region must be a member of the collection set."); | |
2626 HeapRegion* cur = r; | |
2627 while (cur != NULL) { | |
2628 HeapRegion* next = cur->next_in_collection_set(); | |
2629 if (cl->doHeapRegion(cur) && false) { | |
2630 cl->incomplete(); | |
2631 return; | |
2632 } | |
2633 cur = next; | |
2634 } | |
2635 cur = g1_policy()->collection_set(); | |
2636 while (cur != r) { | |
2637 HeapRegion* next = cur->next_in_collection_set(); | |
2638 if (cl->doHeapRegion(cur) && false) { | |
2639 cl->incomplete(); | |
2640 return; | |
2641 } | |
2642 cur = next; | |
2643 } | |
2644 } | |
2645 | |
2646 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
3766 | 2647 return n_regions() > 0 ? region_at(0) : NULL; |
342 | 2648 } |
2649 | |
2650 | |
2651 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
2652 Space* res = heap_region_containing(addr); | |
2653 if (res == NULL) | |
2654 res = perm_gen()->space_containing(addr); | |
2655 return res; | |
2656 } | |
2657 | |
2658 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
2659 Space* sp = space_containing(addr); | |
2660 if (sp != NULL) { | |
2661 return sp->block_start(addr); | |
2662 } | |
2663 return NULL; | |
2664 } | |
2665 | |
2666 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
2667 Space* sp = space_containing(addr); | |
2668 assert(sp != NULL, "block_size of address outside of heap"); | |
2669 return sp->block_size(addr); | |
2670 } | |
2671 | |
2672 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
2673 Space* sp = space_containing(addr); | |
2674 return sp->block_is_obj(addr); | |
2675 } | |
2676 | |
2677 bool G1CollectedHeap::supports_tlab_allocation() const { | |
2678 return true; | |
2679 } | |
2680 | |
2681 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
2682 return HeapRegion::GrainBytes; | |
2683 } | |
2684 | |
2685 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
2686 // Return the remaining space in the cur alloc region, but not less than | |
2687 // the min TLAB size. | |
1313
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2688 |
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2689 // Also, this value can be at most the humongous object threshold, |
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2690 // since we can't allow tlabs to grow big enough to accomodate |
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2691 // humongous objects. |
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2692 |
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2693 HeapRegion* hr = _mutator_alloc_region.get(); |
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2694 size_t max_tlab_size = _humongous_object_threshold_in_words * wordSize; |
2433
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2695 if (hr == NULL) { |
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2696 return max_tlab_size; |
342 | 2697 } else { |
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2698 return MIN2(MAX2(hr->free(), (size_t) MinTLABSize), max_tlab_size); |
342 | 2699 } |
2700 } | |
2701 | |
2702 size_t G1CollectedHeap::max_capacity() const { | |
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2703 return _g1_reserved.byte_size(); |
342 | 2704 } |
2705 | |
2706 jlong G1CollectedHeap::millis_since_last_gc() { | |
2707 // assert(false, "NYI"); | |
2708 return 0; | |
2709 } | |
2710 | |
2711 void G1CollectedHeap::prepare_for_verify() { | |
2712 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
2713 ensure_parsability(false); | |
2714 } | |
2715 g1_rem_set()->prepare_for_verify(); | |
2716 } | |
2717 | |
2718 class VerifyLivenessOopClosure: public OopClosure { | |
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2719 G1CollectedHeap* _g1h; |
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2720 VerifyOption _vo; |
342 | 2721 public: |
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2722 VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo): |
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2723 _g1h(g1h), _vo(vo) |
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2724 { } |
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2725 void do_oop(narrowOop *p) { do_oop_work(p); } |
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2726 void do_oop( oop *p) { do_oop_work(p); } |
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2727 |
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2728 template <class T> void do_oop_work(T *p) { |
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2729 oop obj = oopDesc::load_decode_heap_oop(p); |
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2730 guarantee(obj == NULL || !_g1h->is_obj_dead_cond(obj, _vo), |
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2731 "Dead object referenced by a not dead object"); |
342 | 2732 } |
2733 }; | |
2734 | |
2735 class VerifyObjsInRegionClosure: public ObjectClosure { | |
811 | 2736 private: |
342 | 2737 G1CollectedHeap* _g1h; |
2738 size_t _live_bytes; | |
2739 HeapRegion *_hr; | |
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2740 VerifyOption _vo; |
342 | 2741 public: |
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2742 // _vo == UsePrevMarking -> use "prev" marking information, |
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2743 // _vo == UseNextMarking -> use "next" marking information, |
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2744 // _vo == UseMarkWord -> use mark word from object header. |
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2745 VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo) |
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2746 : _live_bytes(0), _hr(hr), _vo(vo) { |
342 | 2747 _g1h = G1CollectedHeap::heap(); |
2748 } | |
2749 void do_object(oop o) { | |
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2750 VerifyLivenessOopClosure isLive(_g1h, _vo); |
342 | 2751 assert(o != NULL, "Huh?"); |
3772
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2752 if (!_g1h->is_obj_dead_cond(o, _vo)) { |
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2753 // If the object is alive according to the mark word, |
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2754 // then verify that the marking information agrees. |
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2755 // Note we can't verify the contra-positive of the |
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2756 // above: if the object is dead (according to the mark |
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2757 // word), it may not be marked, or may have been marked |
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2758 // but has since became dead, or may have been allocated |
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2759 // since the last marking. |
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2760 if (_vo == VerifyOption_G1UseMarkWord) { |
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2761 guarantee(!_g1h->is_obj_dead(o), "mark word and concurrent mark mismatch"); |
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2762 } |
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|
2763 |
342 | 2764 o->oop_iterate(&isLive); |
1389
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2765 if (!_hr->obj_allocated_since_prev_marking(o)) { |
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2766 size_t obj_size = o->size(); // Make sure we don't overflow |
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2767 _live_bytes += (obj_size * HeapWordSize); |
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2768 } |
342 | 2769 } |
2770 } | |
2771 size_t live_bytes() { return _live_bytes; } | |
2772 }; | |
2773 | |
2774 class PrintObjsInRegionClosure : public ObjectClosure { | |
2775 HeapRegion *_hr; | |
2776 G1CollectedHeap *_g1; | |
2777 public: | |
2778 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
2779 _g1 = G1CollectedHeap::heap(); | |
2780 }; | |
2781 | |
2782 void do_object(oop o) { | |
2783 if (o != NULL) { | |
2784 HeapWord *start = (HeapWord *) o; | |
2785 size_t word_sz = o->size(); | |
2786 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
2787 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
2788 (void*) o, word_sz, | |
2789 _g1->isMarkedPrev(o), | |
2790 _g1->isMarkedNext(o), | |
2791 _hr->obj_allocated_since_prev_marking(o)); | |
2792 HeapWord *end = start + word_sz; | |
2793 HeapWord *cur; | |
2794 int *val; | |
2795 for (cur = start; cur < end; cur++) { | |
2796 val = (int *) cur; | |
2797 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
2798 } | |
2799 } | |
2800 } | |
2801 }; | |
2802 | |
2803 class VerifyRegionClosure: public HeapRegionClosure { | |
811 | 2804 private: |
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|
2805 bool _allow_dirty; |
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|
2806 bool _par; |
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|
2807 VerifyOption _vo; |
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|
2808 bool _failures; |
811 | 2809 public: |
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|
2810 // _vo == UsePrevMarking -> use "prev" marking information, |
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2811 // _vo == UseNextMarking -> use "next" marking information, |
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|
2812 // _vo == UseMarkWord -> use mark word from object header. |
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|
2813 VerifyRegionClosure(bool allow_dirty, bool par, VerifyOption vo) |
845
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2814 : _allow_dirty(allow_dirty), |
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|
2815 _par(par), |
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|
2816 _vo(vo), |
1020
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|
2817 _failures(false) {} |
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|
2818 |
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|
2819 bool failures() { |
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|
2820 return _failures; |
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|
2821 } |
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|
2822 |
342 | 2823 bool doHeapRegion(HeapRegion* r) { |
390 | 2824 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
2825 "Should be unclaimed at verify points."); | |
637
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6817419: G1: Enable extensive verification for humongous regions
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|
2826 if (!r->continuesHumongous()) { |
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|
2827 bool failures = false; |
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|
2828 r->verify(_allow_dirty, _vo, &failures); |
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|
2829 if (failures) { |
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|
2830 _failures = true; |
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|
2831 } else { |
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|
2832 VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo); |
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2833 r->object_iterate(¬_dead_yet_cl); |
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|
2834 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
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2835 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
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|
2836 "max_live_bytes "SIZE_FORMAT" " |
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|
2837 "< calculated "SIZE_FORMAT, |
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|
2838 r->bottom(), r->end(), |
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|
2839 r->max_live_bytes(), |
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|
2840 not_dead_yet_cl.live_bytes()); |
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|
2841 _failures = true; |
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|
2842 } |
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|
2843 } |
342 | 2844 } |
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|
2845 return false; // stop the region iteration if we hit a failure |
342 | 2846 } |
2847 }; | |
2848 | |
2849 class VerifyRootsClosure: public OopsInGenClosure { | |
2850 private: | |
2851 G1CollectedHeap* _g1h; | |
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|
2852 VerifyOption _vo; |
342 | 2853 bool _failures; |
2854 public: | |
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|
2855 // _vo == UsePrevMarking -> use "prev" marking information, |
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|
2856 // _vo == UseNextMarking -> use "next" marking information, |
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|
2857 // _vo == UseMarkWord -> use mark word from object header. |
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|
2858 VerifyRootsClosure(VerifyOption vo) : |
845
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|
2859 _g1h(G1CollectedHeap::heap()), |
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|
2860 _vo(vo), |
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|
2861 _failures(false) { } |
342 | 2862 |
2863 bool failures() { return _failures; } | |
2864 | |
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|
2865 template <class T> void do_oop_nv(T* p) { |
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|
2866 T heap_oop = oopDesc::load_heap_oop(p); |
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|
2867 if (!oopDesc::is_null(heap_oop)) { |
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|
2868 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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|
2869 if (_g1h->is_obj_dead_cond(obj, _vo)) { |
342 | 2870 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
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|
2871 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
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|
2872 if (_vo == VerifyOption_G1UseMarkWord) { |
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2873 gclog_or_tty->print_cr(" Mark word: "PTR_FORMAT, (void*)(obj->mark())); |
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2874 } |
342 | 2875 obj->print_on(gclog_or_tty); |
2876 _failures = true; | |
2877 } | |
2878 } | |
2879 } | |
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2880 |
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2881 void do_oop(oop* p) { do_oop_nv(p); } |
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2882 void do_oop(narrowOop* p) { do_oop_nv(p); } |
342 | 2883 }; |
2884 | |
390 | 2885 // This is the task used for parallel heap verification. |
2886 | |
2887 class G1ParVerifyTask: public AbstractGangTask { | |
2888 private: | |
2889 G1CollectedHeap* _g1h; | |
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2890 bool _allow_dirty; |
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2891 VerifyOption _vo; |
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2892 bool _failures; |
390 | 2893 |
2894 public: | |
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2895 // _vo == UsePrevMarking -> use "prev" marking information, |
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2896 // _vo == UseNextMarking -> use "next" marking information, |
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2897 // _vo == UseMarkWord -> use mark word from object header. |
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2898 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, VerifyOption vo) : |
390 | 2899 AbstractGangTask("Parallel verify task"), |
845
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2900 _g1h(g1h), |
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2901 _allow_dirty(allow_dirty), |
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2902 _vo(vo), |
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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 } |
390 | 2908 |
2909 void work(int worker_i) { | |
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2910 HandleMark hm; |
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2911 VerifyRegionClosure blk(_allow_dirty, true, _vo); |
390 | 2912 _g1h->heap_region_par_iterate_chunked(&blk, worker_i, |
2913 HeapRegion::ParVerifyClaimValue); | |
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2914 if (blk.failures()) { |
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2915 _failures = true; |
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2916 } |
390 | 2917 } |
2918 }; | |
2919 | |
342 | 2920 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
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2921 verify(allow_dirty, silent, VerifyOption_G1UsePrevMarking); |
811 | 2922 } |
2923 | |
2924 void G1CollectedHeap::verify(bool allow_dirty, | |
2925 bool silent, | |
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2926 VerifyOption vo) { |
342 | 2927 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
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2928 if (!silent) { gclog_or_tty->print("Roots (excluding permgen) "); } |
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2929 VerifyRootsClosure rootsCl(vo); |
989
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2930 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
3772
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2931 |
3293
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2932 // We apply the relevant closures to all the oops in the |
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2933 // system dictionary, the string table and the code cache. |
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2934 const int so = SharedHeap::SO_AllClasses | SharedHeap::SO_Strings | SharedHeap::SO_CodeCache; |
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2935 |
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2936 process_strong_roots(true, // activate StrongRootsScope |
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2937 true, // we set "collecting perm gen" to true, |
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2938 // so we don't reset the dirty cards in the perm gen. |
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2939 SharedHeap::ScanningOption(so), // roots scanning options |
342 | 2940 &rootsCl, |
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2941 &blobsCl, |
342 | 2942 &rootsCl); |
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2943 |
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2944 // If we're verifying after the marking phase of a Full GC then we can't |
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2945 // treat the perm gen as roots into the G1 heap. Some of the objects in |
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2946 // the perm gen may be dead and hence not marked. If one of these dead |
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2947 // objects is considered to be a root then we may end up with a false |
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2948 // "Root location <x> points to dead ob <y>" failure. |
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2949 if (vo != VerifyOption_G1UseMarkWord) { |
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2950 // Since we used "collecting_perm_gen" == true above, we will not have |
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2951 // checked the refs from perm into the G1-collected heap. We check those |
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2952 // references explicitly below. Whether the relevant cards are dirty |
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|
2953 // is checked further below in the rem set verification. |
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|
2954 if (!silent) { gclog_or_tty->print("Permgen roots "); } |
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|
2955 perm_gen()->oop_iterate(&rootsCl); |
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|
2956 } |
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2957 bool failures = rootsCl.failures(); |
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2958 |
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|
2959 if (vo != VerifyOption_G1UseMarkWord) { |
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2960 // If we're verifying during a full GC then the region sets |
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2961 // will have been torn down at the start of the GC. Therefore |
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|
2962 // verifying the region sets will fail. So we only verify |
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|
2963 // the region sets when not in a full GC. |
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|
2964 if (!silent) { gclog_or_tty->print("HeapRegionSets "); } |
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|
2965 verify_region_sets(); |
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|
2966 } |
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|
2967 |
2152 | 2968 if (!silent) { gclog_or_tty->print("HeapRegions "); } |
390 | 2969 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
2970 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2971 "sanity check"); | |
2972 | |
3772
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|
2973 G1ParVerifyTask task(this, allow_dirty, vo); |
390 | 2974 int n_workers = workers()->total_workers(); |
2975 set_par_threads(n_workers); | |
2976 workers()->run_task(&task); | |
2977 set_par_threads(0); | |
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|
2978 if (task.failures()) { |
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|
2979 failures = true; |
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|
2980 } |
390 | 2981 |
2982 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), | |
2983 "sanity check"); | |
2984 | |
2985 reset_heap_region_claim_values(); | |
2986 | |
2987 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2988 "sanity check"); | |
2989 } else { | |
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|
2990 VerifyRegionClosure blk(allow_dirty, false, vo); |
3766 | 2991 heap_region_iterate(&blk); |
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|
2992 if (blk.failures()) { |
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|
2993 failures = true; |
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|
2994 } |
390 | 2995 } |
2152 | 2996 if (!silent) gclog_or_tty->print("RemSet "); |
342 | 2997 rem_set()->verify(); |
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|
2998 |
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|
2999 if (failures) { |
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|
3000 gclog_or_tty->print_cr("Heap:"); |
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|
3001 print_on(gclog_or_tty, true /* extended */); |
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|
3002 gclog_or_tty->print_cr(""); |
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|
3003 #ifndef PRODUCT |
1044 | 3004 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
1388 | 3005 concurrent_mark()->print_reachable("at-verification-failure", |
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|
3006 vo, false /* all */); |
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|
3007 } |
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|
3008 #endif |
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|
3009 gclog_or_tty->flush(); |
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|
3010 } |
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|
3011 guarantee(!failures, "there should not have been any failures"); |
342 | 3012 } else { |
3013 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
3014 } | |
3015 } | |
3016 | |
3017 class PrintRegionClosure: public HeapRegionClosure { | |
3018 outputStream* _st; | |
3019 public: | |
3020 PrintRegionClosure(outputStream* st) : _st(st) {} | |
3021 bool doHeapRegion(HeapRegion* r) { | |
3022 r->print_on(_st); | |
3023 return false; | |
3024 } | |
3025 }; | |
3026 | |
838
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|
3027 void G1CollectedHeap::print() const { print_on(tty); } |
342 | 3028 |
3029 void G1CollectedHeap::print_on(outputStream* st) const { | |
838
0316eac49d5a
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|
3030 print_on(st, PrintHeapAtGCExtended); |
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|
3031 } |
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|
3032 |
0316eac49d5a
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|
3033 void G1CollectedHeap::print_on(outputStream* st, bool extended) const { |
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|
3034 st->print(" %-20s", "garbage-first heap"); |
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|
3035 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
846
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|
3036 capacity()/K, used_unlocked()/K); |
838
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|
3037 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
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|
3038 _g1_storage.low_boundary(), |
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|
3039 _g1_storage.high(), |
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|
3040 _g1_storage.high_boundary()); |
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|
3041 st->cr(); |
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|
3042 st->print(" region size " SIZE_FORMAT "K, ", |
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|
3043 HeapRegion::GrainBytes/K); |
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|
3044 size_t young_regions = _young_list->length(); |
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|
3045 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
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|
3046 young_regions, young_regions * HeapRegion::GrainBytes / K); |
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|
3047 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
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|
3048 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
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3049 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
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3050 st->cr(); |
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3051 perm()->as_gen()->print_on(st); |
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3052 if (extended) { |
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3053 st->cr(); |
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3054 print_on_extended(st); |
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3055 } |
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3056 } |
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3057 |
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3058 void G1CollectedHeap::print_on_extended(outputStream* st) const { |
342 | 3059 PrintRegionClosure blk(st); |
3766 | 3060 heap_region_iterate(&blk); |
342 | 3061 } |
3062 | |
3063 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
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3064 if (G1CollectedHeap::use_parallel_gc_threads()) { |
1019 | 3065 workers()->print_worker_threads_on(st); |
3066 } | |
3067 _cmThread->print_on(st); | |
342 | 3068 st->cr(); |
1019 | 3069 _cm->print_worker_threads_on(st); |
3070 _cg1r->print_worker_threads_on(st); | |
342 | 3071 st->cr(); |
3072 } | |
3073 | |
3074 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
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3075 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3076 workers()->threads_do(tc); |
3077 } | |
3078 tc->do_thread(_cmThread); | |
794 | 3079 _cg1r->threads_do(tc); |
342 | 3080 } |
3081 | |
3082 void G1CollectedHeap::print_tracing_info() const { | |
3083 // We'll overload this to mean "trace GC pause statistics." | |
3084 if (TraceGen0Time || TraceGen1Time) { | |
3085 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
3086 // to that. | |
3087 g1_policy()->print_tracing_info(); | |
3088 } | |
751 | 3089 if (G1SummarizeRSetStats) { |
342 | 3090 g1_rem_set()->print_summary_info(); |
3091 } | |
1282 | 3092 if (G1SummarizeConcMark) { |
342 | 3093 concurrent_mark()->print_summary_info(); |
3094 } | |
3095 g1_policy()->print_yg_surv_rate_info(); | |
3096 SpecializationStats::print(); | |
3097 } | |
3098 | |
3777
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3099 #ifndef PRODUCT |
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3100 // Helpful for debugging RSet issues. |
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3101 |
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3102 class PrintRSetsClosure : public HeapRegionClosure { |
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3103 private: |
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3104 const char* _msg; |
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3105 size_t _occupied_sum; |
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3106 |
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3107 public: |
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3108 bool doHeapRegion(HeapRegion* r) { |
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3109 HeapRegionRemSet* hrrs = r->rem_set(); |
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3110 size_t occupied = hrrs->occupied(); |
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3111 _occupied_sum += occupied; |
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3112 |
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3113 gclog_or_tty->print_cr("Printing RSet for region "HR_FORMAT, |
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3114 HR_FORMAT_PARAMS(r)); |
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3115 if (occupied == 0) { |
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3116 gclog_or_tty->print_cr(" RSet is empty"); |
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3117 } else { |
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3118 hrrs->print(); |
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3119 } |
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3120 gclog_or_tty->print_cr("----------"); |
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3121 return false; |
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3122 } |
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3123 |
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3124 PrintRSetsClosure(const char* msg) : _msg(msg), _occupied_sum(0) { |
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3125 gclog_or_tty->cr(); |
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3126 gclog_or_tty->print_cr("========================================"); |
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3127 gclog_or_tty->print_cr(msg); |
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3128 gclog_or_tty->cr(); |
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3129 } |
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3130 |
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3131 ~PrintRSetsClosure() { |
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3132 gclog_or_tty->print_cr("Occupied Sum: "SIZE_FORMAT, _occupied_sum); |
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3133 gclog_or_tty->print_cr("========================================"); |
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3134 gclog_or_tty->cr(); |
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3135 } |
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3136 }; |
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3137 |
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3138 void G1CollectedHeap::print_cset_rsets() { |
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3139 PrintRSetsClosure cl("Printing CSet RSets"); |
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3140 collection_set_iterate(&cl); |
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3141 } |
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3142 |
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3143 void G1CollectedHeap::print_all_rsets() { |
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3144 PrintRSetsClosure cl("Printing All RSets");; |
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3145 heap_region_iterate(&cl); |
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3146 } |
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3147 #endif // PRODUCT |
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3148 |
342 | 3149 G1CollectedHeap* G1CollectedHeap::heap() { |
3150 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
3151 "not a garbage-first heap"); | |
3152 return _g1h; | |
3153 } | |
3154 | |
3155 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
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3156 // always_do_update_barrier = false; |
342 | 3157 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
3158 // Call allocation profiler | |
3159 AllocationProfiler::iterate_since_last_gc(); | |
3160 // Fill TLAB's and such | |
3161 ensure_parsability(true); | |
3162 } | |
3163 | |
3164 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
3165 // FIXME: what is this about? | |
3166 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
3167 // is set. | |
3168 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
3169 "derived pointer present")); | |
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3170 // always_do_update_barrier = true; |
342 | 3171 } |
3172 | |
1973 | 3173 HeapWord* G1CollectedHeap::do_collection_pause(size_t word_size, |
3174 unsigned int gc_count_before, | |
3175 bool* succeeded) { | |
3176 assert_heap_not_locked_and_not_at_safepoint(); | |
342 | 3177 g1_policy()->record_stop_world_start(); |
1973 | 3178 VM_G1IncCollectionPause op(gc_count_before, |
3179 word_size, | |
3180 false, /* should_initiate_conc_mark */ | |
3181 g1_policy()->max_pause_time_ms(), | |
3182 GCCause::_g1_inc_collection_pause); | |
3183 VMThread::execute(&op); | |
3184 | |
3185 HeapWord* result = op.result(); | |
3186 bool ret_succeeded = op.prologue_succeeded() && op.pause_succeeded(); | |
3187 assert(result == NULL || ret_succeeded, | |
3188 "the result should be NULL if the VM did not succeed"); | |
3189 *succeeded = ret_succeeded; | |
3190 | |
3191 assert_heap_not_locked(); | |
3192 return result; | |
342 | 3193 } |
3194 | |
3195 void | |
3196 G1CollectedHeap::doConcurrentMark() { | |
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3197 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
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3198 if (!_cmThread->in_progress()) { |
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3199 _cmThread->set_started(); |
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3200 CGC_lock->notify(); |
342 | 3201 } |
3202 } | |
3203 | |
3204 void G1CollectedHeap::do_sync_mark() { | |
3205 _cm->checkpointRootsInitial(); | |
3206 _cm->markFromRoots(); | |
3207 _cm->checkpointRootsFinal(false); | |
3208 } | |
3209 | |
3210 // <NEW PREDICTION> | |
3211 | |
3212 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
3213 bool young) { | |
3214 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
3215 } | |
3216 | |
3217 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
3218 predicted_time_ms) { | |
3219 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
3220 } | |
3221 | |
3222 size_t G1CollectedHeap::pending_card_num() { | |
3223 size_t extra_cards = 0; | |
3224 JavaThread *curr = Threads::first(); | |
3225 while (curr != NULL) { | |
3226 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
3227 extra_cards += dcq.size(); | |
3228 curr = curr->next(); | |
3229 } | |
3230 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3231 size_t buffer_size = dcqs.buffer_size(); | |
3232 size_t buffer_num = dcqs.completed_buffers_num(); | |
3233 return buffer_size * buffer_num + extra_cards; | |
3234 } | |
3235 | |
3236 size_t G1CollectedHeap::max_pending_card_num() { | |
3237 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3238 size_t buffer_size = dcqs.buffer_size(); | |
3239 size_t buffer_num = dcqs.completed_buffers_num(); | |
3240 int thread_num = Threads::number_of_threads(); | |
3241 return (buffer_num + thread_num) * buffer_size; | |
3242 } | |
3243 | |
3244 size_t G1CollectedHeap::cards_scanned() { | |
1861 | 3245 return g1_rem_set()->cardsScanned(); |
342 | 3246 } |
3247 | |
3248 void | |
3249 G1CollectedHeap::setup_surviving_young_words() { | |
3250 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
3251 size_t array_length = g1_policy()->young_cset_length(); | |
3252 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); | |
3253 if (_surviving_young_words == NULL) { | |
3254 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
3255 "Not enough space for young surv words summary."); | |
3256 } | |
3257 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
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3258 #ifdef ASSERT |
342 | 3259 for (size_t i = 0; i < array_length; ++i) { |
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3260 assert( _surviving_young_words[i] == 0, "memset above" ); |
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3261 } |
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3262 #endif // !ASSERT |
342 | 3263 } |
3264 | |
3265 void | |
3266 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
3267 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
3268 size_t array_length = g1_policy()->young_cset_length(); | |
3269 for (size_t i = 0; i < array_length; ++i) | |
3270 _surviving_young_words[i] += surv_young_words[i]; | |
3271 } | |
3272 | |
3273 void | |
3274 G1CollectedHeap::cleanup_surviving_young_words() { | |
3275 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
3276 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
3277 _surviving_young_words = NULL; | |
3278 } | |
3279 | |
3280 // </NEW PREDICTION> | |
3281 | |
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3282 #ifdef ASSERT |
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3283 class VerifyCSetClosure: public HeapRegionClosure { |
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3284 public: |
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3285 bool doHeapRegion(HeapRegion* hr) { |
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3286 // Here we check that the CSet region's RSet is ready for parallel |
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3287 // iteration. The fields that we'll verify are only manipulated |
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3288 // when the region is part of a CSet and is collected. Afterwards, |
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3289 // we reset these fields when we clear the region's RSet (when the |
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3290 // region is freed) so they are ready when the region is |
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3291 // re-allocated. The only exception to this is if there's an |
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3292 // evacuation failure and instead of freeing the region we leave |
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3293 // it in the heap. In that case, we reset these fields during |
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3294 // evacuation failure handling. |
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3295 guarantee(hr->rem_set()->verify_ready_for_par_iteration(), "verification"); |
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3296 |
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3297 // Here's a good place to add any other checks we'd like to |
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3298 // perform on CSet regions. |
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diff
changeset
|
3299 return false; |
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3300 } |
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3301 }; |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3302 #endif // ASSERT |
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3303 |
1709 | 3304 #if TASKQUEUE_STATS |
3305 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
3306 st->print_raw_cr("GC Task Stats"); | |
3307 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
3308 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
3309 } | |
3310 | |
3311 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
3312 print_taskqueue_stats_hdr(st); | |
3313 | |
3314 TaskQueueStats totals; | |
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3315 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3316 for (int i = 0; i < n; ++i) { |
3317 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
3318 totals += task_queue(i)->stats; | |
3319 } | |
3320 st->print_raw("tot "); totals.print(st); st->cr(); | |
3321 | |
3322 DEBUG_ONLY(totals.verify()); | |
3323 } | |
3324 | |
3325 void G1CollectedHeap::reset_taskqueue_stats() { | |
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3326 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3327 for (int i = 0; i < n; ++i) { |
3328 task_queue(i)->stats.reset(); | |
3329 } | |
3330 } | |
3331 #endif // TASKQUEUE_STATS | |
3332 | |
1973 | 3333 bool |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3334 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
2152 | 3335 assert_at_safepoint(true /* should_be_vm_thread */); |
3336 guarantee(!is_gc_active(), "collection is not reentrant"); | |
3337 | |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3338 if (GC_locker::check_active_before_gc()) { |
1973 | 3339 return false; |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3340 } |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3341 |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2039
diff
changeset
|
3342 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
2039
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
parents:
2038
diff
changeset
|
3343 ResourceMark rm; |
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
parents:
2038
diff
changeset
|
3344 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3345 if (PrintHeapAtGC) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3346 Universe::print_heap_before_gc(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3347 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3348 |
2152 | 3349 verify_region_sets_optional(); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3350 verify_dirty_young_regions(); |
2152 | 3351 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3352 { |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3353 // This call will decide whether this pause is an initial-mark |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3354 // pause. If it is, during_initial_mark_pause() will return true |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3355 // for the duration of this pause. |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3356 g1_policy()->decide_on_conc_mark_initiation(); |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3357 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3358 char verbose_str[128]; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3359 sprintf(verbose_str, "GC pause "); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3360 if (g1_policy()->in_young_gc_mode()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3361 if (g1_policy()->full_young_gcs()) |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3362 strcat(verbose_str, "(young)"); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3363 else |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3364 strcat(verbose_str, "(partial)"); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3365 } |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3366 if (g1_policy()->during_initial_mark_pause()) { |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3367 strcat(verbose_str, " (initial-mark)"); |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3368 // We are about to start a marking cycle, so we increment the |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3369 // full collection counter. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3370 increment_total_full_collections(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3371 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3372 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3373 // if PrintGCDetails is on, we'll print long statistics information |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3374 // in the collector policy code, so let's not print this as the output |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3375 // is messy if we do. |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3376 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3377 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3378 TraceTime t(verbose_str, PrintGC && !PrintGCDetails, true, gclog_or_tty); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3379 |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3380 TraceCollectorStats tcs(g1mm()->incremental_collection_counters()); |
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
3381 TraceMemoryManagerStats tms(false /* fullGC */, gc_cause()); |
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3382 |
2361 | 3383 // If the secondary_free_list is not empty, append it to the |
3384 // free_list. No need to wait for the cleanup operation to finish; | |
3385 // the region allocation code will check the secondary_free_list | |
3386 // and wait if necessary. If the G1StressConcRegionFreeing flag is | |
3387 // set, skip this step so that the region allocation code has to | |
3388 // get entries from the secondary_free_list. | |
2152 | 3389 if (!G1StressConcRegionFreeing) { |
2361 | 3390 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 3391 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3392 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3393 increment_gc_time_stamp(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3394 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3395 if (g1_policy()->in_young_gc_mode()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3396 assert(check_young_list_well_formed(), |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3397 "young list should be well formed"); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3398 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3399 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3400 { // Call to jvmpi::post_class_unload_events must occur outside of active GC |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3401 IsGCActiveMark x; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3402 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3403 gc_prologue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3404 increment_total_collections(false /* full gc */); |
342 | 3405 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3406 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3407 HandleMark hm; // Discard invalid handles created during verification |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3408 gclog_or_tty->print(" VerifyBeforeGC:"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3409 prepare_for_verify(); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3410 Universe::verify(/* allow dirty */ false, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3411 /* silent */ false, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3412 /* option */ VerifyOption_G1UsePrevMarking); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3413 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3414 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3415 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3416 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3417 |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
3418 // Please see comment in G1CollectedHeap::ref_processing_init() |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
3419 // to see how reference processing currently works in G1. |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
3420 // |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3421 // 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
|
3422 // 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
parents:
811
diff
changeset
|
3423 bool was_enabled = ref_processor()->discovery_enabled(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3424 if (was_enabled) ref_processor()->disable_discovery(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3425 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3426 // 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
parents:
811
diff
changeset
|
3427 // of the collection set!). |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3428 release_mutator_alloc_region(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3429 |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3430 // We should call this after we retire the mutator alloc |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3431 // region(s) so that all the ALLOC / RETIRE events are generated |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3432 // before the start GC event. |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3433 _hr_printer.start_gc(false /* full */, (size_t) total_collections()); |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3434 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3435 // The elapsed time induced by the start time below deliberately elides |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3436 // the possible verification above. |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3437 double start_time_sec = os::elapsedTime(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3438 size_t start_used_bytes = used(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3439 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3440 #if YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3441 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
johnc
parents:
1391
diff
changeset
|
3442 _young_list->print(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3443 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
|
3444 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3445 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3446 g1_policy()->record_collection_pause_start(start_time_sec, |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3447 start_used_bytes); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3448 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3449 #if YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3450 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3451 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3452 #endif // YOUNG_LIST_VERBOSE |
342 | 3453 |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3454 if (g1_policy()->during_initial_mark_pause()) { |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3455 concurrent_mark()->checkpointRootsInitialPre(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3456 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3457 save_marks(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3458 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3459 // We must do this before any possible evacuation that should propagate |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3460 // marks. |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3461 if (mark_in_progress()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3462 double start_time_sec = os::elapsedTime(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3463 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3464 _cm->drainAllSATBBuffers(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3465 double finish_mark_ms = (os::elapsedTime() - start_time_sec) * 1000.0; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3466 g1_policy()->record_satb_drain_time(finish_mark_ms); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3467 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3468 // Record the number of elements currently on the mark stack, so we |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3469 // only iterate over these. (Since evacuation may add to the mark |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3470 // stack, doing more exposes race conditions.) If no mark is in |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3471 // progress, this will be zero. |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3472 _cm->set_oops_do_bound(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3473 |
3378
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3474 if (mark_in_progress()) { |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3475 concurrent_mark()->newCSet(); |
3378
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3476 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3477 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3478 #if YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3479 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
johnc
parents:
1391
diff
changeset
|
3480 _young_list->print(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3481 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
|
3482 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3483 |
1707 | 3484 g1_policy()->choose_collection_set(target_pause_time_ms); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3485 |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3486 if (_hr_printer.is_active()) { |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3487 HeapRegion* hr = g1_policy()->collection_set(); |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3488 while (hr != NULL) { |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3489 G1HRPrinter::RegionType type; |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3490 if (!hr->is_young()) { |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3491 type = G1HRPrinter::Old; |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3492 } else if (hr->is_survivor()) { |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3493 type = G1HRPrinter::Survivor; |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3494 } else { |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3495 type = G1HRPrinter::Eden; |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3496 } |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3497 _hr_printer.cset(hr); |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3498 hr = hr->next_in_collection_set(); |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3499 } |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3500 } |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3501 |
3378
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3502 // We have chosen the complete collection set. If marking is |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3503 // active then, we clear the region fields of any of the |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3504 // concurrent marking tasks whose region fields point into |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3505 // the collection set as these values will become stale. This |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3506 // will cause the owning marking threads to claim a new region |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3507 // when marking restarts. |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3508 if (mark_in_progress()) { |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3509 concurrent_mark()->reset_active_task_region_fields_in_cset(); |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3510 } |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3511 |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3512 #ifdef ASSERT |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3513 VerifyCSetClosure cl; |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3514 collection_set_iterate(&cl); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3515 #endif // ASSERT |
1707 | 3516 |
3517 setup_surviving_young_words(); | |
3518 | |
3519 // Set up the gc allocation regions. | |
3520 get_gc_alloc_regions(); | |
3521 | |
3522 // Actually do the work... | |
3523 evacuate_collection_set(); | |
3524 | |
3525 free_collection_set(g1_policy()->collection_set()); | |
3526 g1_policy()->clear_collection_set(); | |
3527 | |
3528 cleanup_surviving_young_words(); | |
3529 | |
3530 // Start a new incremental collection set for the next pause. | |
3531 g1_policy()->start_incremental_cset_building(); | |
3532 | |
3533 // Clear the _cset_fast_test bitmap in anticipation of adding | |
3534 // regions to the incremental collection set for the next | |
3535 // evacuation pause. | |
3536 clear_cset_fast_test(); | |
3537 | |
3538 if (g1_policy()->in_young_gc_mode()) { | |
3539 _young_list->reset_sampled_info(); | |
3540 | |
3541 // Don't check the whole heap at this point as the | |
3542 // GC alloc regions from this pause have been tagged | |
3543 // as survivors and moved on to the survivor list. | |
3544 // Survivor regions will fail the !is_young() check. | |
3545 assert(check_young_list_empty(false /* check_heap */), | |
3546 "young list should be empty"); | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3547 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3548 #if YOUNG_LIST_VERBOSE |
1707 | 3549 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
3550 _young_list->print(); | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3551 #endif // YOUNG_LIST_VERBOSE |
342 | 3552 |
1707 | 3553 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3554 _young_list->first_survivor_region(), |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3555 _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
|
3556 |
1707 | 3557 _young_list->reset_auxilary_lists(); |
342 | 3558 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3559 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3560 if (evacuation_failed()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3561 _summary_bytes_used = recalculate_used(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3562 } else { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3563 // 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
|
3564 // 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
|
3565 _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
|
3566 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3567 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3568 if (g1_policy()->in_young_gc_mode() && |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3569 g1_policy()->during_initial_mark_pause()) { |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3570 concurrent_mark()->checkpointRootsInitialPost(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3571 set_marking_started(); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3572 // CAUTION: after the doConcurrentMark() call below, |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3573 // the concurrent marking thread(s) could be running |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3574 // concurrently with us. Make sure that anything after |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3575 // 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
|
3576 // 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
|
3577 // 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
|
3578 // ConcurrentGCThread::safepoint_desynchronize(). |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3579 doConcurrentMark(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3580 } |
342 | 3581 |
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
3582 allocate_dummy_regions(); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
3583 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3584 #if YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3585 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
|
3586 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3587 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
|
3588 #endif // YOUNG_LIST_VERBOSE |
342 | 3589 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3590 init_mutator_alloc_region(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3591 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3592 double end_time_sec = os::elapsedTime(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3593 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
|
3594 g1_policy()->record_pause_time_ms(pause_time_ms); |
1707 | 3595 g1_policy()->record_collection_pause_end(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3596 |
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3597 MemoryService::track_memory_usage(); |
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3598 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3599 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3600 HandleMark hm; // Discard invalid handles created during verification |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3601 gclog_or_tty->print(" VerifyAfterGC:"); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3602 prepare_for_verify(); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3603 Universe::verify(/* allow dirty */ true, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3604 /* silent */ false, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3605 /* option */ VerifyOption_G1UsePrevMarking); |
342 | 3606 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3607 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3608 if (was_enabled) ref_processor()->enable_discovery(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3609 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3610 { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3611 size_t expand_bytes = g1_policy()->expansion_amount(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3612 if (expand_bytes > 0) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3613 size_t bytes_before = capacity(); |
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3614 if (!expand(expand_bytes)) { |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3615 // 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
|
3616 // committed/uncommitted amount match the backing store |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3617 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3618 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
|
3619 } |
838
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 } |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3622 |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3623 // We should do this after we potentially expand the heap so |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3624 // that all the COMMIT events are generated before the end GC |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3625 // event, and after we retire the GC alloc regions so that all |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3626 // RETIRE events are generated before the end GC event. |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3627 _hr_printer.end_gc(false /* full */, (size_t) total_collections()); |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3628 |
3764
053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
tonyp
parents:
3378
diff
changeset
|
3629 // We have to do this after we decide whether to expand the heap or not. |
053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
tonyp
parents:
3378
diff
changeset
|
3630 g1_policy()->print_heap_transition(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3631 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3632 if (mark_in_progress()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3633 concurrent_mark()->update_g1_committed(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3634 } |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3635 |
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3636 #ifdef TRACESPINNING |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3637 ParallelTaskTerminator::print_termination_counts(); |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3638 #endif |
342 | 3639 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3640 gc_epilogue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3641 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3642 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3643 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3644 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
|
3645 print_tracing_info(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3646 vm_exit(-1); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3647 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3648 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3649 |
3766 | 3650 _hrs.verify_optional(); |
2152 | 3651 verify_region_sets_optional(); |
3652 | |
1709 | 3653 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
3654 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); | |
3655 | |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3656 if (PrintHeapAtGC) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3657 Universe::print_heap_after_gc(); |
342 | 3658 } |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3659 g1mm()->update_counters(); |
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3660 |
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3661 if (G1SummarizeRSetStats && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3662 (G1SummarizeRSetStatsPeriod > 0) && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3663 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3664 g1_rem_set()->print_summary_info(); |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3665 } |
1973 | 3666 |
3667 return true; | |
342 | 3668 } |
3669 | |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3670 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3671 { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3672 size_t gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3673 switch (purpose) { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3674 case GCAllocForSurvived: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3675 gclab_word_size = YoungPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3676 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3677 case GCAllocForTenured: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3678 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3679 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3680 default: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3681 assert(false, "unknown GCAllocPurpose"); |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3682 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3683 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3684 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3685 return gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3686 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3687 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3688 void G1CollectedHeap::init_mutator_alloc_region() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3689 assert(_mutator_alloc_region.get() == NULL, "pre-condition"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3690 _mutator_alloc_region.init(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3691 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3692 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3693 void G1CollectedHeap::release_mutator_alloc_region() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3694 _mutator_alloc_region.release(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3695 assert(_mutator_alloc_region.get() == NULL, "post-condition"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3696 } |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3697 |
342 | 3698 void G1CollectedHeap::set_gc_alloc_region(int purpose, HeapRegion* r) { |
3699 assert(purpose >= 0 && purpose < GCAllocPurposeCount, "invalid purpose"); | |
636 | 3700 // make sure we don't call set_gc_alloc_region() multiple times on |
3701 // the same region | |
3702 assert(r == NULL || !r->is_gc_alloc_region(), | |
3703 "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
|
3704 assert(r == NULL || !r->isHumongous(), |
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3705 "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
|
3706 |
342 | 3707 HeapWord* original_top = NULL; |
3708 if (r != NULL) | |
3709 original_top = r->top(); | |
3710 | |
3711 // We will want to record the used space in r as being there before gc. | |
3712 // One we install it as a GC alloc region it's eligible for allocation. | |
3713 // So record it now and use it later. | |
3714 size_t r_used = 0; | |
3715 if (r != NULL) { | |
3716 r_used = r->used(); | |
3717 | |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
3718 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3719 // need to take the lock to guard against two threads calling |
3720 // get_gc_alloc_region concurrently (very unlikely but...) | |
3721 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
3722 r->save_marks(); | |
3723 } | |
3724 } | |
3725 HeapRegion* old_alloc_region = _gc_alloc_regions[purpose]; | |
3726 _gc_alloc_regions[purpose] = r; | |
3727 if (old_alloc_region != NULL) { | |
3728 // Replace aliases too. | |
3729 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
3730 if (_gc_alloc_regions[ap] == old_alloc_region) { | |
3731 _gc_alloc_regions[ap] = r; | |
3732 } | |
3733 } | |
3734 } | |
3735 if (r != NULL) { | |
3736 push_gc_alloc_region(r); | |
3737 if (mark_in_progress() && original_top != r->next_top_at_mark_start()) { | |
3738 // We are using a region as a GC alloc region after it has been used | |
3739 // as a mutator allocation region during the current marking cycle. | |
3740 // The mutator-allocated objects are currently implicitly marked, but | |
3741 // when we move hr->next_top_at_mark_start() forward at the the end | |
3742 // of the GC pause, they won't be. We therefore mark all objects in | |
3743 // the "gap". We do this object-by-object, since marking densely | |
3744 // does not currently work right with marking bitmap iteration. This | |
3745 // means we rely on TLAB filling at the start of pauses, and no | |
3746 // "resuscitation" of filled TLAB's. If we want to do this, we need | |
3747 // to fix the marking bitmap iteration. | |
3748 HeapWord* curhw = r->next_top_at_mark_start(); | |
3749 HeapWord* t = original_top; | |
3750 | |
3751 while (curhw < t) { | |
3752 oop cur = (oop)curhw; | |
3753 // We'll assume parallel for generality. This is rare code. | |
3754 concurrent_mark()->markAndGrayObjectIfNecessary(cur); // can't we just mark them? | |
3755 curhw = curhw + cur->size(); | |
3756 } | |
3757 assert(curhw == t, "Should have parsed correctly."); | |
3758 } | |
3759 if (G1PolicyVerbose > 1) { | |
3760 gclog_or_tty->print("New alloc region ["PTR_FORMAT", "PTR_FORMAT", " PTR_FORMAT") " | |
3761 "for survivors:", r->bottom(), original_top, r->end()); | |
3762 r->print(); | |
3763 } | |
3764 g1_policy()->record_before_bytes(r_used); | |
3765 } | |
3766 } | |
3767 | |
3768 void G1CollectedHeap::push_gc_alloc_region(HeapRegion* hr) { | |
3769 assert(Thread::current()->is_VM_thread() || | |
2152 | 3770 FreeList_lock->owned_by_self(), "Precondition"); |
342 | 3771 assert(!hr->is_gc_alloc_region() && !hr->in_collection_set(), |
3772 "Precondition."); | |
3773 hr->set_is_gc_alloc_region(true); | |
3774 hr->set_next_gc_alloc_region(_gc_alloc_region_list); | |
3775 _gc_alloc_region_list = hr; | |
3776 } | |
3777 | |
3778 #ifdef G1_DEBUG | |
3779 class FindGCAllocRegion: public HeapRegionClosure { | |
3780 public: | |
3781 bool doHeapRegion(HeapRegion* r) { | |
3782 if (r->is_gc_alloc_region()) { | |
3766 | 3783 gclog_or_tty->print_cr("Region "HR_FORMAT" is still a GC alloc region", |
3784 HR_FORMAT_PARAMS(r)); | |
342 | 3785 } |
3786 return false; | |
3787 } | |
3788 }; | |
3789 #endif // G1_DEBUG | |
3790 | |
3791 void G1CollectedHeap::forget_alloc_region_list() { | |
2152 | 3792 assert_at_safepoint(true /* should_be_vm_thread */); |
342 | 3793 while (_gc_alloc_region_list != NULL) { |
3794 HeapRegion* r = _gc_alloc_region_list; | |
3795 assert(r->is_gc_alloc_region(), "Invariant."); | |
637
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3796 // We need HeapRegion::oops_on_card_seq_iterate_careful() to work on |
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3797 // newly allocated data in order to be able to apply deferred updates |
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3798 // before the GC is done for verification purposes (i.e to allow |
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
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3799 // G1HRRSFlushLogBuffersOnVerify). It's safe thing to do after the |
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3800 // collection. |
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3801 r->ContiguousSpace::set_saved_mark(); |
342 | 3802 _gc_alloc_region_list = r->next_gc_alloc_region(); |
3803 r->set_next_gc_alloc_region(NULL); | |
3804 r->set_is_gc_alloc_region(false); | |
545 | 3805 if (r->is_survivor()) { |
3806 if (r->is_empty()) { | |
3807 r->set_not_young(); | |
3808 } else { | |
3809 _young_list->add_survivor_region(r); | |
3810 } | |
3811 } | |
342 | 3812 } |
3813 #ifdef G1_DEBUG | |
3814 FindGCAllocRegion fa; | |
3815 heap_region_iterate(&fa); | |
3816 #endif // G1_DEBUG | |
3817 } | |
3818 | |
3819 | |
3820 bool G1CollectedHeap::check_gc_alloc_regions() { | |
3821 // TODO: allocation regions check | |
3822 return true; | |
3823 } | |
3824 | |
3825 void G1CollectedHeap::get_gc_alloc_regions() { | |
636 | 3826 // First, let's check that the GC alloc region list is empty (it should) |
3827 assert(_gc_alloc_region_list == NULL, "invariant"); | |
3828 | |
342 | 3829 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
636 | 3830 assert(_gc_alloc_regions[ap] == NULL, "invariant"); |
861
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3831 assert(_gc_alloc_region_counts[ap] == 0, "invariant"); |
636 | 3832 |
342 | 3833 // Create new GC alloc regions. |
636 | 3834 HeapRegion* alloc_region = _retained_gc_alloc_regions[ap]; |
3835 _retained_gc_alloc_regions[ap] = NULL; | |
3836 | |
3837 if (alloc_region != NULL) { | |
3838 assert(_retain_gc_alloc_region[ap], "only way to retain a GC region"); | |
3839 | |
3840 // let's make sure that the GC alloc region is not tagged as such | |
3841 // outside a GC operation | |
3842 assert(!alloc_region->is_gc_alloc_region(), "sanity"); | |
3843 | |
3844 if (alloc_region->in_collection_set() || | |
3845 alloc_region->top() == alloc_region->end() || | |
1360
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3846 alloc_region->top() == alloc_region->bottom() || |
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3847 alloc_region->isHumongous()) { |
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3848 // we will discard the current GC alloc region if |
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3849 // * it's in the collection set (it can happen!), |
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3850 // * it's already full (no point in using it), |
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3851 // * it's empty (this means that it was emptied during |
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3852 // a cleanup and it should be on the free list now), or |
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3853 // * it's humongous (this means that it was emptied |
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3854 // during a cleanup and was added to the free list, but |
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3855 // has been subseqently used to allocate a humongous |
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|
3856 // object that may be less than the region size). |
636 | 3857 |
3858 alloc_region = NULL; | |
3859 } | |
3860 } | |
3861 | |
3862 if (alloc_region == NULL) { | |
3863 // we will get a new GC alloc region | |
2188
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3864 alloc_region = new_gc_alloc_region(ap, HeapRegion::GrainWords); |
861
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3865 } else { |
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3866 // the region was retained from the last collection |
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3867 ++_gc_alloc_region_counts[ap]; |
3778
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3868 |
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3869 _hr_printer.reuse(alloc_region); |
342 | 3870 } |
636 | 3871 |
342 | 3872 if (alloc_region != NULL) { |
636 | 3873 assert(_gc_alloc_regions[ap] == NULL, "pre-condition"); |
342 | 3874 set_gc_alloc_region(ap, alloc_region); |
3875 } | |
636 | 3876 |
3877 assert(_gc_alloc_regions[ap] == NULL || | |
3878 _gc_alloc_regions[ap]->is_gc_alloc_region(), | |
3879 "the GC alloc region should be tagged as such"); | |
3880 assert(_gc_alloc_regions[ap] == NULL || | |
3881 _gc_alloc_regions[ap] == _gc_alloc_region_list, | |
3882 "the GC alloc region should be the same as the GC alloc list head"); | |
342 | 3883 } |
3884 // Set alternative regions for allocation purposes that have reached | |
636 | 3885 // their limit. |
342 | 3886 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
3887 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(ap); | |
3888 if (_gc_alloc_regions[ap] == NULL && alt_purpose != ap) { | |
3889 _gc_alloc_regions[ap] = _gc_alloc_regions[alt_purpose]; | |
3890 } | |
3891 } | |
3892 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
3893 } | |
3894 | |
636 | 3895 void G1CollectedHeap::release_gc_alloc_regions(bool totally) { |
342 | 3896 // We keep a separate list of all regions that have been alloc regions in |
636 | 3897 // the current collection pause. Forget that now. This method will |
3898 // untag the GC alloc regions and tear down the GC alloc region | |
3899 // list. It's desirable that no regions are tagged as GC alloc | |
3900 // outside GCs. | |
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3901 |
342 | 3902 forget_alloc_region_list(); |
3903 | |
3904 // The current alloc regions contain objs that have survived | |
3905 // collection. Make them no longer GC alloc regions. | |
3906 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
3907 HeapRegion* r = _gc_alloc_regions[ap]; | |
636 | 3908 _retained_gc_alloc_regions[ap] = NULL; |
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3909 _gc_alloc_region_counts[ap] = 0; |
636 | 3910 |
3911 if (r != NULL) { | |
3912 // we retain nothing on _gc_alloc_regions between GCs | |
3913 set_gc_alloc_region(ap, NULL); | |
3914 | |
3915 if (r->is_empty()) { | |
2152 | 3916 // We didn't actually allocate anything in it; let's just put |
3917 // it back on the free list. | |
2432
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3918 _free_list.add_as_head(r); |
636 | 3919 } else if (_retain_gc_alloc_region[ap] && !totally) { |
3920 // retain it so that we can use it at the beginning of the next GC | |
3921 _retained_gc_alloc_regions[ap] = r; | |
342 | 3922 } |
3923 } | |
636 | 3924 } |
3925 } | |
3926 | |
3927 #ifndef PRODUCT | |
3928 // Useful for debugging | |
3929 | |
3930 void G1CollectedHeap::print_gc_alloc_regions() { | |
3931 gclog_or_tty->print_cr("GC alloc regions"); | |
3932 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
3933 HeapRegion* r = _gc_alloc_regions[ap]; | |
3934 if (r == NULL) { | |
3935 gclog_or_tty->print_cr(" %2d : "PTR_FORMAT, ap, NULL); | |
3936 } else { | |
3937 gclog_or_tty->print_cr(" %2d : "PTR_FORMAT" "SIZE_FORMAT, | |
3938 ap, r->bottom(), r->used()); | |
3939 } | |
3940 } | |
3941 } | |
3942 #endif // PRODUCT | |
342 | 3943 |
3944 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
3945 _drain_in_progress = false; | |
3946 set_evac_failure_closure(cl); | |
3947 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
3948 } | |
3949 | |
3950 void G1CollectedHeap::finalize_for_evac_failure() { | |
3951 assert(_evac_failure_scan_stack != NULL && | |
3952 _evac_failure_scan_stack->length() == 0, | |
3953 "Postcondition"); | |
3954 assert(!_drain_in_progress, "Postcondition"); | |
1045 | 3955 delete _evac_failure_scan_stack; |
342 | 3956 _evac_failure_scan_stack = NULL; |
3957 } | |
3958 | |
3959 | |
3960 | |
3961 // *** Sequential G1 Evacuation | |
3962 | |
3963 class G1IsAliveClosure: public BoolObjectClosure { | |
3964 G1CollectedHeap* _g1; | |
3965 public: | |
3966 G1IsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
3967 void do_object(oop p) { assert(false, "Do not call."); } | |
3968 bool do_object_b(oop p) { | |
3969 // It is reachable if it is outside the collection set, or is inside | |
3970 // and forwarded. | |
3971 | |
3972 #ifdef G1_DEBUG | |
3973 gclog_or_tty->print_cr("is alive "PTR_FORMAT" in CS %d forwarded %d overall %d", | |
3974 (void*) p, _g1->obj_in_cs(p), p->is_forwarded(), | |
3975 !_g1->obj_in_cs(p) || p->is_forwarded()); | |
3976 #endif // G1_DEBUG | |
3977 | |
3978 return !_g1->obj_in_cs(p) || p->is_forwarded(); | |
3979 } | |
3980 }; | |
3981 | |
3982 class G1KeepAliveClosure: public OopClosure { | |
3983 G1CollectedHeap* _g1; | |
3984 public: | |
3985 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
845
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3986 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
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3987 void do_oop( oop* p) { |
342 | 3988 oop obj = *p; |
3989 #ifdef G1_DEBUG | |
3990 if (PrintGC && Verbose) { | |
3991 gclog_or_tty->print_cr("keep alive *"PTR_FORMAT" = "PTR_FORMAT" "PTR_FORMAT, | |
3992 p, (void*) obj, (void*) *p); | |
3993 } | |
3994 #endif // G1_DEBUG | |
3995 | |
3996 if (_g1->obj_in_cs(obj)) { | |
3997 assert( obj->is_forwarded(), "invariant" ); | |
3998 *p = obj->forwardee(); | |
3999 #ifdef G1_DEBUG | |
4000 gclog_or_tty->print_cr(" in CSet: moved "PTR_FORMAT" -> "PTR_FORMAT, | |
4001 (void*) obj, (void*) *p); | |
4002 #endif // G1_DEBUG | |
4003 } | |
4004 } | |
4005 }; | |
4006 | |
616
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4007 class UpdateRSetDeferred : public OopsInHeapRegionClosure { |
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4008 private: |
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4009 G1CollectedHeap* _g1; |
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4010 DirtyCardQueue *_dcq; |
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4011 CardTableModRefBS* _ct_bs; |
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4012 |
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4013 public: |
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4014 UpdateRSetDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
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4015 _g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) {} |
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4016 |
845
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4017 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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4018 virtual void do_oop( oop* p) { do_oop_work(p); } |
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4019 template <class T> void do_oop_work(T* p) { |
616
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4020 assert(_from->is_in_reserved(p), "paranoia"); |
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4021 if (!_from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && |
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4022 !_from->is_survivor()) { |
616
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4023 size_t card_index = _ct_bs->index_for(p); |
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4024 if (_ct_bs->mark_card_deferred(card_index)) { |
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4025 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
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4026 } |
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4027 } |
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4028 } |
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4029 }; |
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4030 |
342 | 4031 class RemoveSelfPointerClosure: public ObjectClosure { |
4032 private: | |
4033 G1CollectedHeap* _g1; | |
4034 ConcurrentMark* _cm; | |
4035 HeapRegion* _hr; | |
4036 size_t _prev_marked_bytes; | |
4037 size_t _next_marked_bytes; | |
616
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4038 OopsInHeapRegionClosure *_cl; |
342 | 4039 public: |
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4040 RemoveSelfPointerClosure(G1CollectedHeap* g1, HeapRegion* hr, |
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4041 OopsInHeapRegionClosure* cl) : |
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4042 _g1(g1), _hr(hr), _cm(_g1->concurrent_mark()), _prev_marked_bytes(0), |
616
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4043 _next_marked_bytes(0), _cl(cl) {} |
342 | 4044 |
4045 size_t prev_marked_bytes() { return _prev_marked_bytes; } | |
4046 size_t next_marked_bytes() { return _next_marked_bytes; } | |
4047 | |
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4048 // <original comment> |
352
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4049 // The original idea here was to coalesce evacuated and dead objects. |
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4050 // However that caused complications with the block offset table (BOT). |
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4051 // In particular if there were two TLABs, one of them partially refined. |
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4052 // |----- TLAB_1--------|----TLAB_2-~~~(partially refined part)~~~| |
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4053 // The BOT entries of the unrefined part of TLAB_2 point to the start |
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4054 // of TLAB_2. If the last object of the TLAB_1 and the first object |
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4055 // of TLAB_2 are coalesced, then the cards of the unrefined part |
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4056 // would point into middle of the filler object. |
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4057 // The current approach is to not coalesce and leave the BOT contents intact. |
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4058 // </original comment> |
352
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4059 // |
2133
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4060 // We now reset the BOT when we start the object iteration over the |
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4061 // region and refine its entries for every object we come across. So |
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4062 // the above comment is not really relevant and we should be able |
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|
4063 // to coalesce dead objects if we want to. |
352
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4064 void do_object(oop obj) { |
2133
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4065 HeapWord* obj_addr = (HeapWord*) obj; |
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4066 assert(_hr->is_in(obj_addr), "sanity"); |
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4067 size_t obj_size = obj->size(); |
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4068 _hr->update_bot_for_object(obj_addr, obj_size); |
352
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4069 if (obj->is_forwarded() && obj->forwardee() == obj) { |
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4070 // The object failed to move. |
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4071 assert(!_g1->is_obj_dead(obj), "We should not be preserving dead objs."); |
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4072 _cm->markPrev(obj); |
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4073 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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4074 _prev_marked_bytes += (obj_size * HeapWordSize); |
352
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4075 if (_g1->mark_in_progress() && !_g1->is_obj_ill(obj)) { |
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4076 _cm->markAndGrayObjectIfNecessary(obj); |
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4077 } |
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4078 obj->set_mark(markOopDesc::prototype()); |
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4079 // While we were processing RSet buffers during the |
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4080 // collection, we actually didn't scan any cards on the |
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4081 // collection set, since we didn't want to update remebered |
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4082 // sets with entries that point into the collection set, given |
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4083 // that live objects fromthe collection set are about to move |
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4084 // and such entries will be stale very soon. This change also |
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4085 // dealt with a reliability issue which involved scanning a |
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4086 // card in the collection set and coming across an array that |
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4087 // was being chunked and looking malformed. The problem is |
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4088 // that, if evacuation fails, we might have remembered set |
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4089 // entries missing given that we skipped cards on the |
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4090 // collection set. So, we'll recreate such entries now. |
616
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4091 obj->oop_iterate(_cl); |
352
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4092 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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4093 } else { |
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4094 // The object has been either evacuated or is dead. Fill it with a |
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4095 // dummy object. |
2133
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4096 MemRegion mr((HeapWord*)obj, obj_size); |
481
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4097 CollectedHeap::fill_with_object(mr); |
342 | 4098 _cm->clearRangeBothMaps(mr); |
4099 } | |
4100 } | |
4101 }; | |
4102 | |
4103 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
1705 | 4104 UpdateRSetImmediate immediate_update(_g1h->g1_rem_set()); |
616
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4105 DirtyCardQueue dcq(&_g1h->dirty_card_queue_set()); |
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4106 UpdateRSetDeferred deferred_update(_g1h, &dcq); |
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4107 OopsInHeapRegionClosure *cl; |
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4108 if (G1DeferredRSUpdate) { |
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4109 cl = &deferred_update; |
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4110 } else { |
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4111 cl = &immediate_update; |
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4112 } |
342 | 4113 HeapRegion* cur = g1_policy()->collection_set(); |
4114 while (cur != NULL) { | |
4115 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
2133
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4116 assert(!cur->isHumongous(), "sanity"); |
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4117 |
342 | 4118 if (cur->evacuation_failed()) { |
4119 assert(cur->in_collection_set(), "bad CS"); | |
2133
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4120 RemoveSelfPointerClosure rspc(_g1h, cur, cl); |
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4121 |
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4122 // In the common case we make sure that this is done when the |
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4123 // region is freed so that it is "ready-to-go" when it's |
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4124 // re-allocated. However, when evacuation failure happens, a |
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4125 // region will remain in the heap and might ultimately be added |
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4126 // to a CSet in the future. So we have to be careful here and |
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4127 // make sure the region's RSet is ready for parallel iteration |
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4128 // whenever this might be required in the future. |
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4129 cur->rem_set()->reset_for_par_iteration(); |
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4130 cur->reset_bot(); |
616
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4131 cl->set_region(cur); |
342 | 4132 cur->object_iterate(&rspc); |
4133 | |
4134 // A number of manipulations to make the TAMS be the current top, | |
4135 // and the marked bytes be the ones observed in the iteration. | |
4136 if (_g1h->concurrent_mark()->at_least_one_mark_complete()) { | |
4137 // The comments below are the postconditions achieved by the | |
4138 // calls. Note especially the last such condition, which says that | |
4139 // the count of marked bytes has been properly restored. | |
4140 cur->note_start_of_marking(false); | |
4141 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
4142 cur->add_to_marked_bytes(rspc.prev_marked_bytes()); | |
4143 // _next_marked_bytes == prev_marked_bytes. | |
4144 cur->note_end_of_marking(); | |
4145 // _prev_top_at_mark_start == top(), | |
4146 // _prev_marked_bytes == prev_marked_bytes | |
4147 } | |
4148 // If there is no mark in progress, we modified the _next variables | |
4149 // above needlessly, but harmlessly. | |
4150 if (_g1h->mark_in_progress()) { | |
4151 cur->note_start_of_marking(false); | |
4152 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
4153 // _next_marked_bytes == next_marked_bytes. | |
4154 } | |
4155 | |
4156 // Now make sure the region has the right index in the sorted array. | |
4157 g1_policy()->note_change_in_marked_bytes(cur); | |
4158 } | |
4159 cur = cur->next_in_collection_set(); | |
4160 } | |
4161 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
4162 | |
4163 // Now restore saved marks, if any. | |
4164 if (_objs_with_preserved_marks != NULL) { | |
4165 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
4166 guarantee(_objs_with_preserved_marks->length() == | |
4167 _preserved_marks_of_objs->length(), "Both or none."); | |
4168 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
4169 oop obj = _objs_with_preserved_marks->at(i); | |
4170 markOop m = _preserved_marks_of_objs->at(i); | |
4171 obj->set_mark(m); | |
4172 } | |
4173 // Delete the preserved marks growable arrays (allocated on the C heap). | |
4174 delete _objs_with_preserved_marks; | |
4175 delete _preserved_marks_of_objs; | |
4176 _objs_with_preserved_marks = NULL; | |
4177 _preserved_marks_of_objs = NULL; | |
4178 } | |
4179 } | |
4180 | |
4181 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
4182 _evac_failure_scan_stack->push(obj); | |
4183 } | |
4184 | |
4185 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
4186 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
4187 | |
4188 while (_evac_failure_scan_stack->length() > 0) { | |
4189 oop obj = _evac_failure_scan_stack->pop(); | |
4190 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
4191 obj->oop_iterate_backwards(_evac_failure_closure); | |
4192 } | |
4193 } | |
4194 | |
4195 oop | |
4196 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
4197 oop old) { | |
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4198 assert(obj_in_cs(old), |
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4199 err_msg("obj: "PTR_FORMAT" should still be in the CSet", |
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4200 (HeapWord*) old)); |
342 | 4201 markOop m = old->mark(); |
4202 oop forward_ptr = old->forward_to_atomic(old); | |
4203 if (forward_ptr == NULL) { | |
4204 // Forward-to-self succeeded. | |
4205 if (_evac_failure_closure != cl) { | |
4206 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
4207 assert(!_drain_in_progress, | |
4208 "Should only be true while someone holds the lock."); | |
4209 // Set the global evac-failure closure to the current thread's. | |
4210 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
4211 set_evac_failure_closure(cl); | |
4212 // Now do the common part. | |
4213 handle_evacuation_failure_common(old, m); | |
4214 // Reset to NULL. | |
4215 set_evac_failure_closure(NULL); | |
4216 } else { | |
4217 // The lock is already held, and this is recursive. | |
4218 assert(_drain_in_progress, "This should only be the recursive case."); | |
4219 handle_evacuation_failure_common(old, m); | |
4220 } | |
4221 return old; | |
4222 } else { | |
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4223 // Forward-to-self failed. Either someone else managed to allocate |
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4224 // space for this object (old != forward_ptr) or they beat us in |
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4225 // self-forwarding it (old == forward_ptr). |
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4226 assert(old == forward_ptr || !obj_in_cs(forward_ptr), |
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4227 err_msg("obj: "PTR_FORMAT" forwarded to: "PTR_FORMAT" " |
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4228 "should not be in the CSet", |
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4229 (HeapWord*) old, (HeapWord*) forward_ptr)); |
342 | 4230 return forward_ptr; |
4231 } | |
4232 } | |
4233 | |
4234 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
4235 set_evacuation_failed(true); | |
4236 | |
4237 preserve_mark_if_necessary(old, m); | |
4238 | |
4239 HeapRegion* r = heap_region_containing(old); | |
4240 if (!r->evacuation_failed()) { | |
4241 r->set_evacuation_failed(true); | |
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4242 _hr_printer.evac_failure(r); |
342 | 4243 } |
4244 | |
4245 push_on_evac_failure_scan_stack(old); | |
4246 | |
4247 if (!_drain_in_progress) { | |
4248 // prevent recursion in copy_to_survivor_space() | |
4249 _drain_in_progress = true; | |
4250 drain_evac_failure_scan_stack(); | |
4251 _drain_in_progress = false; | |
4252 } | |
4253 } | |
4254 | |
4255 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
2038
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4256 assert(evacuation_failed(), "Oversaving!"); |
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4257 // We want to call the "for_promotion_failure" version only in the |
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4258 // case of a promotion failure. |
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4259 if (m->must_be_preserved_for_promotion_failure(obj)) { |
342 | 4260 if (_objs_with_preserved_marks == NULL) { |
4261 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
4262 _objs_with_preserved_marks = | |
4263 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
4264 _preserved_marks_of_objs = | |
4265 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
4266 } | |
4267 _objs_with_preserved_marks->push(obj); | |
4268 _preserved_marks_of_objs->push(m); | |
4269 } | |
4270 } | |
4271 | |
4272 // *** Parallel G1 Evacuation | |
4273 | |
4274 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
4275 size_t word_size) { | |
1718
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4276 assert(!isHumongous(word_size), |
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4277 err_msg("we should not be seeing humongous allocation requests " |
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|
4278 "during GC, word_size = "SIZE_FORMAT, word_size)); |
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4279 |
342 | 4280 HeapRegion* alloc_region = _gc_alloc_regions[purpose]; |
4281 // let the caller handle alloc failure | |
4282 if (alloc_region == NULL) return NULL; | |
4283 | |
4284 HeapWord* block = alloc_region->par_allocate(word_size); | |
4285 if (block == NULL) { | |
4286 block = allocate_during_gc_slow(purpose, alloc_region, true, word_size); | |
4287 } | |
4288 return block; | |
4289 } | |
4290 | |
545 | 4291 void G1CollectedHeap::retire_alloc_region(HeapRegion* alloc_region, |
4292 bool par) { | |
4293 // Another thread might have obtained alloc_region for the given | |
4294 // purpose, and might be attempting to allocate in it, and might | |
4295 // succeed. Therefore, we can't do the "finalization" stuff on the | |
4296 // region below until we're sure the last allocation has happened. | |
4297 // We ensure this by allocating the remaining space with a garbage | |
4298 // object. | |
4299 if (par) par_allocate_remaining_space(alloc_region); | |
4300 // Now we can do the post-GC stuff on the region. | |
4301 alloc_region->note_end_of_copying(); | |
4302 g1_policy()->record_after_bytes(alloc_region->used()); | |
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4303 _hr_printer.retire(alloc_region); |
545 | 4304 } |
4305 | |
342 | 4306 HeapWord* |
4307 G1CollectedHeap::allocate_during_gc_slow(GCAllocPurpose purpose, | |
4308 HeapRegion* alloc_region, | |
4309 bool par, | |
4310 size_t word_size) { | |
1718
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4311 assert(!isHumongous(word_size), |
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4312 err_msg("we should not be seeing humongous allocation requests " |
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4313 "during GC, word_size = "SIZE_FORMAT, word_size)); |
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4314 |
2152 | 4315 // We need to make sure we serialize calls to this method. Given |
4316 // that the FreeList_lock guards accesses to the free_list anyway, | |
4317 // and we need to potentially remove a region from it, we'll use it | |
4318 // to protect the whole call. | |
4319 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); | |
4320 | |
342 | 4321 HeapWord* block = NULL; |
4322 // In the parallel case, a previous thread to obtain the lock may have | |
4323 // already assigned a new gc_alloc_region. | |
4324 if (alloc_region != _gc_alloc_regions[purpose]) { | |
4325 assert(par, "But should only happen in parallel case."); | |
4326 alloc_region = _gc_alloc_regions[purpose]; | |
4327 if (alloc_region == NULL) return NULL; | |
4328 block = alloc_region->par_allocate(word_size); | |
4329 if (block != NULL) return block; | |
4330 // Otherwise, continue; this new region is empty, too. | |
4331 } | |
4332 assert(alloc_region != NULL, "We better have an allocation region"); | |
545 | 4333 retire_alloc_region(alloc_region, par); |
342 | 4334 |
4335 if (_gc_alloc_region_counts[purpose] >= g1_policy()->max_regions(purpose)) { | |
4336 // Cannot allocate more regions for the given purpose. | |
4337 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(purpose); | |
4338 // Is there an alternative? | |
4339 if (purpose != alt_purpose) { | |
4340 HeapRegion* alt_region = _gc_alloc_regions[alt_purpose]; | |
4341 // Has not the alternative region been aliased? | |
545 | 4342 if (alloc_region != alt_region && alt_region != NULL) { |
342 | 4343 // Try to allocate in the alternative region. |
4344 if (par) { | |
4345 block = alt_region->par_allocate(word_size); | |
4346 } else { | |
4347 block = alt_region->allocate(word_size); | |
4348 } | |
4349 // Make an alias. | |
4350 _gc_alloc_regions[purpose] = _gc_alloc_regions[alt_purpose]; | |
545 | 4351 if (block != NULL) { |
4352 return block; | |
4353 } | |
4354 retire_alloc_region(alt_region, par); | |
342 | 4355 } |
4356 // Both the allocation region and the alternative one are full | |
4357 // and aliased, replace them with a new allocation region. | |
4358 purpose = alt_purpose; | |
4359 } else { | |
4360 set_gc_alloc_region(purpose, NULL); | |
4361 return NULL; | |
4362 } | |
4363 } | |
4364 | |
4365 // Now allocate a new region for allocation. | |
2152 | 4366 alloc_region = new_gc_alloc_region(purpose, word_size); |
342 | 4367 |
4368 // let the caller handle alloc failure | |
4369 if (alloc_region != NULL) { | |
4370 | |
4371 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
4372 assert(alloc_region->saved_mark_at_top(), | |
4373 "Mark should have been saved already."); | |
4374 // This must be done last: once it's installed, other regions may | |
4375 // allocate in it (without holding the lock.) | |
4376 set_gc_alloc_region(purpose, alloc_region); | |
4377 | |
4378 if (par) { | |
4379 block = alloc_region->par_allocate(word_size); | |
4380 } else { | |
4381 block = alloc_region->allocate(word_size); | |
4382 } | |
4383 // Caller handles alloc failure. | |
4384 } else { | |
4385 // This sets other apis using the same old alloc region to NULL, also. | |
4386 set_gc_alloc_region(purpose, NULL); | |
4387 } | |
4388 return block; // May be NULL. | |
4389 } | |
4390 | |
4391 void G1CollectedHeap::par_allocate_remaining_space(HeapRegion* r) { | |
4392 HeapWord* block = NULL; | |
4393 size_t free_words; | |
4394 do { | |
4395 free_words = r->free()/HeapWordSize; | |
4396 // If there's too little space, no one can allocate, so we're done. | |
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4397 if (free_words < CollectedHeap::min_fill_size()) return; |
342 | 4398 // Otherwise, try to claim it. |
4399 block = r->par_allocate(free_words); | |
4400 } while (block == NULL); | |
481
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4401 fill_with_object(block, free_words); |
342 | 4402 } |
4403 | |
4404 #ifndef PRODUCT | |
4405 bool GCLabBitMapClosure::do_bit(size_t offset) { | |
4406 HeapWord* addr = _bitmap->offsetToHeapWord(offset); | |
4407 guarantee(_cm->isMarked(oop(addr)), "it should be!"); | |
4408 return true; | |
4409 } | |
4410 #endif // PRODUCT | |
4411 | |
845
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4412 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) |
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4413 : _g1h(g1h), |
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4414 _refs(g1h->task_queue(queue_num)), |
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4415 _dcq(&g1h->dirty_card_queue_set()), |
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4416 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
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4417 _g1_rem(g1h->g1_rem_set()), |
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4418 _hash_seed(17), _queue_num(queue_num), |
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4419 _term_attempts(0), |
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4420 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
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4421 _tenured_alloc_buffer(g1h->desired_plab_sz(GCAllocForTenured)), |
845
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4422 _age_table(false), |
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4423 _strong_roots_time(0), _term_time(0), |
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4424 _alloc_buffer_waste(0), _undo_waste(0) |
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4425 { |
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4426 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
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4427 // we "sacrifice" entry 0 to keep track of surviving bytes for |
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4428 // non-young regions (where the age is -1) |
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4429 // We also add a few elements at the beginning and at the end in |
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4430 // an attempt to eliminate cache contention |
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4431 size_t real_length = 1 + _g1h->g1_policy()->young_cset_length(); |
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4432 size_t array_length = PADDING_ELEM_NUM + |
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4433 real_length + |
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4434 PADDING_ELEM_NUM; |
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4435 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); |
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4436 if (_surviving_young_words_base == NULL) |
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4437 vm_exit_out_of_memory(array_length * sizeof(size_t), |
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4438 "Not enough space for young surv histo."); |
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4439 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; |
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4440 memset(_surviving_young_words, 0, real_length * sizeof(size_t)); |
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4441 |
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4442 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
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4443 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
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4444 |
845
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4445 _start = os::elapsedTime(); |
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4446 } |
342 | 4447 |
1709 | 4448 void |
4449 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
4450 { | |
4451 st->print_raw_cr("GC Termination Stats"); | |
4452 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
4453 " ------waste (KiB)------"); | |
4454 st->print_raw_cr("thr ms ms % ms % attempts" | |
4455 " total alloc undo"); | |
4456 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
4457 " ------- ------- -------"); | |
4458 } | |
4459 | |
4460 void | |
4461 G1ParScanThreadState::print_termination_stats(int i, | |
4462 outputStream* const st) const | |
4463 { | |
4464 const double elapsed_ms = elapsed_time() * 1000.0; | |
4465 const double s_roots_ms = strong_roots_time() * 1000.0; | |
4466 const double term_ms = term_time() * 1000.0; | |
4467 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
4468 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
4469 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
4470 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
4471 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
4472 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
4473 alloc_buffer_waste() * HeapWordSize / K, | |
4474 undo_waste() * HeapWordSize / K); | |
4475 } | |
4476 | |
1862
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4477 #ifdef ASSERT |
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4478 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { |
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4479 assert(ref != NULL, "invariant"); |
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4480 assert(UseCompressedOops, "sanity"); |
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4481 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
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4482 oop p = oopDesc::load_decode_heap_oop(ref); |
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6989448: G1: refactor and simplify G1ParScanThreadState
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4483 assert(_g1h->is_in_g1_reserved(p), |
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6989448: G1: refactor and simplify G1ParScanThreadState
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4484 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
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4485 return true; |
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4486 } |
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4487 |
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4488 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
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4489 assert(ref != NULL, "invariant"); |
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4490 if (has_partial_array_mask(ref)) { |
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4491 // Must be in the collection set--it's already been copied. |
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4492 oop p = clear_partial_array_mask(ref); |
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4493 assert(_g1h->obj_in_cs(p), |
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4494 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
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4495 } else { |
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4496 oop p = oopDesc::load_decode_heap_oop(ref); |
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4497 assert(_g1h->is_in_g1_reserved(p), |
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4498 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
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4499 } |
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4500 return true; |
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|
4501 } |
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4502 |
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4503 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
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4504 if (ref.is_narrow()) { |
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4505 return verify_ref((narrowOop*) ref); |
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4506 } else { |
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4507 return verify_ref((oop*) ref); |
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4508 } |
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4509 } |
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4510 #endif // ASSERT |
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4511 |
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4512 void G1ParScanThreadState::trim_queue() { |
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4513 StarTask ref; |
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4514 do { |
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4515 // Drain the overflow stack first, so other threads can steal. |
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4516 while (refs()->pop_overflow(ref)) { |
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4517 deal_with_reference(ref); |
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4518 } |
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4519 while (refs()->pop_local(ref)) { |
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4520 deal_with_reference(ref); |
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4521 } |
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4522 } while (!refs()->is_empty()); |
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4523 } |
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4524 |
342 | 4525 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : |
4526 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), | |
4527 _par_scan_state(par_scan_state) { } | |
4528 | |
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4529 template <class T> void G1ParCopyHelper::mark_forwardee(T* p) { |
342 | 4530 // This is called _after_ do_oop_work has been called, hence after |
4531 // the object has been relocated to its new location and *p points | |
4532 // to its new location. | |
4533 | |
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4534 T heap_oop = oopDesc::load_heap_oop(p); |
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4535 if (!oopDesc::is_null(heap_oop)) { |
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4536 oop obj = oopDesc::decode_heap_oop(heap_oop); |
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4537 HeapWord* addr = (HeapWord*)obj; |
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4538 if (_g1->is_in_g1_reserved(addr)) { |
342 | 4539 _cm->grayRoot(oop(addr)); |
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4540 } |
342 | 4541 } |
4542 } | |
4543 | |
4544 oop G1ParCopyHelper::copy_to_survivor_space(oop old) { | |
4545 size_t word_sz = old->size(); | |
4546 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
4547 // +1 to make the -1 indexes valid... | |
4548 int young_index = from_region->young_index_in_cset()+1; | |
4549 assert( (from_region->is_young() && young_index > 0) || | |
4550 (!from_region->is_young() && young_index == 0), "invariant" ); | |
4551 G1CollectorPolicy* g1p = _g1->g1_policy(); | |
4552 markOop m = old->mark(); | |
545 | 4553 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
4554 : m->age(); | |
4555 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
342 | 4556 word_sz); |
4557 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
4558 oop obj = oop(obj_ptr); | |
4559 | |
4560 if (obj_ptr == NULL) { | |
4561 // This will either forward-to-self, or detect that someone else has | |
4562 // installed a forwarding pointer. | |
4563 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
4564 return _g1->handle_evacuation_failure_par(cl, old); | |
4565 } | |
4566 | |
526 | 4567 // We're going to allocate linearly, so might as well prefetch ahead. |
4568 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
4569 | |
342 | 4570 oop forward_ptr = old->forward_to_atomic(obj); |
4571 if (forward_ptr == NULL) { | |
4572 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
526 | 4573 if (g1p->track_object_age(alloc_purpose)) { |
4574 // We could simply do obj->incr_age(). However, this causes a | |
4575 // performance issue. obj->incr_age() will first check whether | |
4576 // the object has a displaced mark by checking its mark word; | |
4577 // getting the mark word from the new location of the object | |
4578 // stalls. So, given that we already have the mark word and we | |
4579 // are about to install it anyway, it's better to increase the | |
4580 // age on the mark word, when the object does not have a | |
4581 // displaced mark word. We're not expecting many objects to have | |
4582 // a displaced marked word, so that case is not optimized | |
4583 // further (it could be...) and we simply call obj->incr_age(). | |
4584 | |
4585 if (m->has_displaced_mark_helper()) { | |
4586 // in this case, we have to install the mark word first, | |
4587 // otherwise obj looks to be forwarded (the old mark word, | |
4588 // which contains the forward pointer, was copied) | |
4589 obj->set_mark(m); | |
4590 obj->incr_age(); | |
4591 } else { | |
4592 m = m->incr_age(); | |
545 | 4593 obj->set_mark(m); |
526 | 4594 } |
545 | 4595 _par_scan_state->age_table()->add(obj, word_sz); |
4596 } else { | |
4597 obj->set_mark(m); | |
526 | 4598 } |
4599 | |
342 | 4600 // preserve "next" mark bit |
4601 if (_g1->mark_in_progress() && !_g1->is_obj_ill(old)) { | |
4602 if (!use_local_bitmaps || | |
4603 !_par_scan_state->alloc_buffer(alloc_purpose)->mark(obj_ptr)) { | |
4604 // if we couldn't mark it on the local bitmap (this happens when | |
4605 // the object was not allocated in the GCLab), we have to bite | |
4606 // the bullet and do the standard parallel mark | |
4607 _cm->markAndGrayObjectIfNecessary(obj); | |
4608 } | |
4609 #if 1 | |
4610 if (_g1->isMarkedNext(old)) { | |
4611 _cm->nextMarkBitMap()->parClear((HeapWord*)old); | |
4612 } | |
4613 #endif | |
4614 } | |
4615 | |
4616 size_t* surv_young_words = _par_scan_state->surviving_young_words(); | |
4617 surv_young_words[young_index] += word_sz; | |
4618 | |
4619 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
4620 arrayOop(old)->set_length(0); | |
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4621 oop* old_p = set_partial_array_mask(old); |
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4622 _par_scan_state->push_on_queue(old_p); |
342 | 4623 } else { |
526 | 4624 // No point in using the slower heap_region_containing() method, |
4625 // given that we know obj is in the heap. | |
4626 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
342 | 4627 obj->oop_iterate_backwards(_scanner); |
4628 } | |
4629 } else { | |
4630 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
4631 obj = forward_ptr; | |
4632 } | |
4633 return obj; | |
4634 } | |
4635 | |
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4636 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_forwardee> |
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4637 template <class T> |
1261
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4638 void G1ParCopyClosure <do_gen_barrier, barrier, do_mark_forwardee> |
845
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4639 ::do_oop_work(T* p) { |
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4640 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 4641 assert(barrier != G1BarrierRS || obj != NULL, |
4642 "Precondition: G1BarrierRS implies obj is nonNull"); | |
4643 | |
526 | 4644 // here the null check is implicit in the cset_fast_test() test |
1261
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4645 if (_g1->in_cset_fast_test(obj)) { |
526 | 4646 if (obj->is_forwarded()) { |
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4647 oopDesc::encode_store_heap_oop(p, obj->forwardee()); |
526 | 4648 } else { |
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4649 oop copy_oop = copy_to_survivor_space(obj); |
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4650 oopDesc::encode_store_heap_oop(p, copy_oop); |
342 | 4651 } |
526 | 4652 // When scanning the RS, we only care about objs in CS. |
4653 if (barrier == G1BarrierRS) { | |
616
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4654 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
342 | 4655 } |
526 | 4656 } |
4657 | |
4658 if (barrier == G1BarrierEvac && obj != NULL) { | |
616
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4659 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
526 | 4660 } |
4661 | |
4662 if (do_gen_barrier && obj != NULL) { | |
4663 par_do_barrier(p); | |
4664 } | |
4665 } | |
4666 | |
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4667 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
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4668 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
845
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4669 |
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4670 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
526 | 4671 assert(has_partial_array_mask(p), "invariant"); |
4672 oop old = clear_partial_array_mask(p); | |
342 | 4673 assert(old->is_objArray(), "must be obj array"); |
4674 assert(old->is_forwarded(), "must be forwarded"); | |
4675 assert(Universe::heap()->is_in_reserved(old), "must be in heap."); | |
4676 | |
4677 objArrayOop obj = objArrayOop(old->forwardee()); | |
4678 assert((void*)old != (void*)old->forwardee(), "self forwarding here?"); | |
4679 // Process ParGCArrayScanChunk elements now | |
4680 // and push the remainder back onto queue | |
4681 int start = arrayOop(old)->length(); | |
4682 int end = obj->length(); | |
4683 int remainder = end - start; | |
4684 assert(start <= end, "just checking"); | |
4685 if (remainder > 2 * ParGCArrayScanChunk) { | |
4686 // Test above combines last partial chunk with a full chunk | |
4687 end = start + ParGCArrayScanChunk; | |
4688 arrayOop(old)->set_length(end); | |
4689 // Push remainder. | |
845
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4690 oop* old_p = set_partial_array_mask(old); |
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4691 assert(arrayOop(old)->length() < obj->length(), "Empty push?"); |
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4692 _par_scan_state->push_on_queue(old_p); |
342 | 4693 } else { |
4694 // Restore length so that the heap remains parsable in | |
4695 // case of evacuation failure. | |
4696 arrayOop(old)->set_length(end); | |
4697 } | |
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4698 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
342 | 4699 // process our set of indices (include header in first chunk) |
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4700 obj->oop_iterate_range(&_scanner, start, end); |
342 | 4701 } |
4702 | |
4703 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
4704 protected: | |
4705 G1CollectedHeap* _g1h; | |
4706 G1ParScanThreadState* _par_scan_state; | |
4707 RefToScanQueueSet* _queues; | |
4708 ParallelTaskTerminator* _terminator; | |
4709 | |
4710 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
4711 RefToScanQueueSet* queues() { return _queues; } | |
4712 ParallelTaskTerminator* terminator() { return _terminator; } | |
4713 | |
4714 public: | |
4715 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
4716 G1ParScanThreadState* par_scan_state, | |
4717 RefToScanQueueSet* queues, | |
4718 ParallelTaskTerminator* terminator) | |
4719 : _g1h(g1h), _par_scan_state(par_scan_state), | |
4720 _queues(queues), _terminator(terminator) {} | |
4721 | |
1862
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4722 void do_void(); |
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4723 |
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4724 private: |
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4725 inline bool offer_termination(); |
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4726 }; |
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4727 |
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4728 bool G1ParEvacuateFollowersClosure::offer_termination() { |
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4729 G1ParScanThreadState* const pss = par_scan_state(); |
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4730 pss->start_term_time(); |
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4731 const bool res = terminator()->offer_termination(); |
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4732 pss->end_term_time(); |
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4733 return res; |
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4734 } |
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4735 |
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4736 void G1ParEvacuateFollowersClosure::do_void() { |
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4737 StarTask stolen_task; |
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4738 G1ParScanThreadState* const pss = par_scan_state(); |
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4739 pss->trim_queue(); |
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4740 |
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4741 do { |
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4742 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
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4743 assert(pss->verify_task(stolen_task), "sanity"); |
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4744 if (stolen_task.is_narrow()) { |
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4745 pss->deal_with_reference((narrowOop*) stolen_task); |
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4746 } else { |
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4747 pss->deal_with_reference((oop*) stolen_task); |
1862
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4748 } |
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4749 |
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4750 // We've just processed a reference and we might have made |
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4751 // available new entries on the queues. So we have to make sure |
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4752 // we drain the queues as necessary. |
342 | 4753 pss->trim_queue(); |
4754 } | |
1862
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4755 } while (!offer_termination()); |
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4756 |
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4757 pss->retire_alloc_buffers(); |
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4758 } |
342 | 4759 |
4760 class G1ParTask : public AbstractGangTask { | |
4761 protected: | |
4762 G1CollectedHeap* _g1h; | |
4763 RefToScanQueueSet *_queues; | |
4764 ParallelTaskTerminator _terminator; | |
845
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4765 int _n_workers; |
342 | 4766 |
4767 Mutex _stats_lock; | |
4768 Mutex* stats_lock() { return &_stats_lock; } | |
4769 | |
4770 size_t getNCards() { | |
4771 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
4772 / G1BlockOffsetSharedArray::N_bytes; | |
4773 } | |
4774 | |
4775 public: | |
4776 G1ParTask(G1CollectedHeap* g1h, int workers, RefToScanQueueSet *task_queues) | |
4777 : AbstractGangTask("G1 collection"), | |
4778 _g1h(g1h), | |
4779 _queues(task_queues), | |
4780 _terminator(workers, _queues), | |
845
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4781 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true), |
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4782 _n_workers(workers) |
342 | 4783 {} |
4784 | |
4785 RefToScanQueueSet* queues() { return _queues; } | |
4786 | |
4787 RefToScanQueue *work_queue(int i) { | |
4788 return queues()->queue(i); | |
4789 } | |
4790 | |
4791 void work(int i) { | |
845
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4792 if (i >= _n_workers) return; // no work needed this round |
1611 | 4793 |
4794 double start_time_ms = os::elapsedTime() * 1000.0; | |
4795 _g1h->g1_policy()->record_gc_worker_start_time(i, start_time_ms); | |
4796 | |
342 | 4797 ResourceMark rm; |
4798 HandleMark hm; | |
4799 | |
526 | 4800 G1ParScanThreadState pss(_g1h, i); |
4801 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss); | |
4802 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss); | |
4803 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss); | |
342 | 4804 |
4805 pss.set_evac_closure(&scan_evac_cl); | |
4806 pss.set_evac_failure_closure(&evac_failure_cl); | |
4807 pss.set_partial_scan_closure(&partial_scan_cl); | |
4808 | |
4809 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss); | |
4810 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss); | |
4811 G1ParScanHeapRSClosure only_scan_heap_rs_cl(_g1h, &pss); | |
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4812 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
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4813 |
342 | 4814 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss); |
4815 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss); | |
4816 G1ParScanAndMarkHeapRSClosure scan_mark_heap_rs_cl(_g1h, &pss); | |
4817 | |
4818 OopsInHeapRegionClosure *scan_root_cl; | |
4819 OopsInHeapRegionClosure *scan_perm_cl; | |
4820 | |
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4821 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
342 | 4822 scan_root_cl = &scan_mark_root_cl; |
4823 scan_perm_cl = &scan_mark_perm_cl; | |
4824 } else { | |
4825 scan_root_cl = &only_scan_root_cl; | |
4826 scan_perm_cl = &only_scan_perm_cl; | |
4827 } | |
4828 | |
4829 pss.start_strong_roots(); | |
4830 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
4831 SharedHeap::SO_AllClasses, | |
4832 scan_root_cl, | |
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4833 &push_heap_rs_cl, |
342 | 4834 scan_perm_cl, |
4835 i); | |
4836 pss.end_strong_roots(); | |
4837 { | |
4838 double start = os::elapsedTime(); | |
4839 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
4840 evac.do_void(); | |
4841 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
4842 double term_ms = pss.term_time()*1000.0; | |
4843 _g1h->g1_policy()->record_obj_copy_time(i, elapsed_ms-term_ms); | |
1611 | 4844 _g1h->g1_policy()->record_termination(i, term_ms, pss.term_attempts()); |
342 | 4845 } |
1282 | 4846 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
342 | 4847 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
4848 | |
4849 // Clean up any par-expanded rem sets. | |
4850 HeapRegionRemSet::par_cleanup(); | |
4851 | |
4852 if (ParallelGCVerbose) { | |
1709 | 4853 MutexLocker x(stats_lock()); |
4854 pss.print_termination_stats(i); | |
342 | 4855 } |
4856 | |
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4857 assert(pss.refs()->is_empty(), "should be empty"); |
1611 | 4858 double end_time_ms = os::elapsedTime() * 1000.0; |
4859 _g1h->g1_policy()->record_gc_worker_end_time(i, end_time_ms); | |
342 | 4860 } |
4861 }; | |
4862 | |
4863 // *** Common G1 Evacuation Stuff | |
4864 | |
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4865 // This method is run in a GC worker. |
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4866 |
342 | 4867 void |
4868 G1CollectedHeap:: | |
4869 g1_process_strong_roots(bool collecting_perm_gen, | |
4870 SharedHeap::ScanningOption so, | |
4871 OopClosure* scan_non_heap_roots, | |
4872 OopsInHeapRegionClosure* scan_rs, | |
4873 OopsInGenClosure* scan_perm, | |
4874 int worker_i) { | |
4875 // First scan the strong roots, including the perm gen. | |
4876 double ext_roots_start = os::elapsedTime(); | |
4877 double closure_app_time_sec = 0.0; | |
4878 | |
4879 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
4880 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
4881 buf_scan_perm.set_generation(perm_gen()); | |
4882 | |
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4883 // Walk the code cache w/o buffering, because StarTask cannot handle |
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|
4884 // unaligned oop locations. |
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|
4885 CodeBlobToOopClosure eager_scan_code_roots(scan_non_heap_roots, /*do_marking=*/ true); |
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4886 |
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4887 process_strong_roots(false, // no scoping; this is parallel code |
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4888 collecting_perm_gen, so, |
342 | 4889 &buf_scan_non_heap_roots, |
989
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4890 &eager_scan_code_roots, |
342 | 4891 &buf_scan_perm); |
1394
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|
4892 |
342 | 4893 // Finish up any enqueued closure apps. |
4894 buf_scan_non_heap_roots.done(); | |
4895 buf_scan_perm.done(); | |
4896 double ext_roots_end = os::elapsedTime(); | |
4897 g1_policy()->reset_obj_copy_time(worker_i); | |
4898 double obj_copy_time_sec = | |
4899 buf_scan_non_heap_roots.closure_app_seconds() + | |
4900 buf_scan_perm.closure_app_seconds(); | |
4901 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); | |
4902 double ext_root_time_ms = | |
4903 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
4904 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); | |
4905 | |
4906 // Scan strong roots in mark stack. | |
4907 if (!_process_strong_tasks->is_task_claimed(G1H_PS_mark_stack_oops_do)) { | |
4908 concurrent_mark()->oops_do(scan_non_heap_roots); | |
4909 } | |
4910 double mark_stack_scan_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; | |
4911 g1_policy()->record_mark_stack_scan_time(worker_i, mark_stack_scan_ms); | |
4912 | |
4913 // XXX What should this be doing in the parallel case? | |
4914 g1_policy()->record_collection_pause_end_CH_strong_roots(); | |
4915 // Now scan the complement of the collection set. | |
4916 if (scan_rs != NULL) { | |
4917 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
4918 } | |
4919 // Finish with the ref_processor roots. | |
4920 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { | |
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4921 // We need to treat the discovered reference lists as roots and |
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4922 // keep entries (which are added by the marking threads) on them |
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4923 // live until they can be processed at the end of marking. |
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4924 ref_processor()->weak_oops_do(scan_non_heap_roots); |
342 | 4925 ref_processor()->oops_do(scan_non_heap_roots); |
4926 } | |
4927 g1_policy()->record_collection_pause_end_G1_strong_roots(); | |
4928 _process_strong_tasks->all_tasks_completed(); | |
4929 } | |
4930 | |
4931 void | |
4932 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
4933 OopClosure* non_root_closure) { | |
989
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4934 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
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4935 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
342 | 4936 } |
4937 | |
4938 | |
4939 class SaveMarksClosure: public HeapRegionClosure { | |
4940 public: | |
4941 bool doHeapRegion(HeapRegion* r) { | |
4942 r->save_marks(); | |
4943 return false; | |
4944 } | |
4945 }; | |
4946 | |
4947 void G1CollectedHeap::save_marks() { | |
1833
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4948 if (!CollectedHeap::use_parallel_gc_threads()) { |
342 | 4949 SaveMarksClosure sm; |
4950 heap_region_iterate(&sm); | |
4951 } | |
4952 // We do this even in the parallel case | |
4953 perm_gen()->save_marks(); | |
4954 } | |
4955 | |
4956 void G1CollectedHeap::evacuate_collection_set() { | |
4957 set_evacuation_failed(false); | |
4958 | |
4959 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
4960 concurrent_g1_refine()->set_use_cache(false); | |
889 | 4961 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
4962 | |
342 | 4963 int n_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); |
4964 set_par_threads(n_workers); | |
4965 G1ParTask g1_par_task(this, n_workers, _task_queues); | |
4966 | |
4967 init_for_evac_failure(NULL); | |
4968 | |
4969 rem_set()->prepare_for_younger_refs_iterate(true); | |
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4970 |
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4971 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
342 | 4972 double start_par = os::elapsedTime(); |
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4973 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 4974 // The individual threads will set their evac-failure closures. |
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4975 StrongRootsScope srs(this); |
1709 | 4976 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
342 | 4977 workers()->run_task(&g1_par_task); |
4978 } else { | |
989
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|
4979 StrongRootsScope srs(this); |
342 | 4980 g1_par_task.work(0); |
4981 } | |
4982 | |
4983 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
4984 g1_policy()->record_par_time(par_time); | |
4985 set_par_threads(0); | |
4986 // Is this the right thing to do here? We don't save marks | |
4987 // on individual heap regions when we allocate from | |
4988 // them in parallel, so this seems like the correct place for this. | |
545 | 4989 retire_all_alloc_regions(); |
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4990 |
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|
4991 // Weak root processing. |
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|
4992 // Note: when JSR 292 is enabled and code blobs can contain |
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|
4993 // non-perm oops then we will need to process the code blobs |
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|
4994 // here too. |
342 | 4995 { |
4996 G1IsAliveClosure is_alive(this); | |
4997 G1KeepAliveClosure keep_alive(this); | |
4998 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
4999 } | |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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diff
changeset
|
5000 release_gc_alloc_regions(false /* totally */); |
342 | 5001 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); |
616
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|
5002 |
889 | 5003 concurrent_g1_refine()->clear_hot_cache(); |
342 | 5004 concurrent_g1_refine()->set_use_cache(true); |
5005 | |
5006 finalize_for_evac_failure(); | |
5007 | |
5008 // Must do this before removing self-forwarding pointers, which clears | |
5009 // the per-region evac-failure flags. | |
5010 concurrent_mark()->complete_marking_in_collection_set(); | |
5011 | |
5012 if (evacuation_failed()) { | |
5013 remove_self_forwarding_pointers(); | |
5014 if (PrintGCDetails) { | |
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6975964: G1: print out a more descriptive message for evacuation failure when +PrintGCDetails is set
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diff
changeset
|
5015 gclog_or_tty->print(" (to-space overflow)"); |
342 | 5016 } else if (PrintGC) { |
5017 gclog_or_tty->print("--"); | |
5018 } | |
5019 } | |
5020 | |
616
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5021 if (G1DeferredRSUpdate) { |
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|
5022 RedirtyLoggedCardTableEntryFastClosure redirty; |
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|
5023 dirty_card_queue_set().set_closure(&redirty); |
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|
5024 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
1111 | 5025 |
5026 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
5027 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
616
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5028 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
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5029 } |
342 | 5030 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
5031 } | |
5032 | |
2173 | 5033 void G1CollectedHeap::free_region_if_empty(HeapRegion* hr, |
2152 | 5034 size_t* pre_used, |
5035 FreeRegionList* free_list, | |
5036 HumongousRegionSet* humongous_proxy_set, | |
2173 | 5037 HRRSCleanupTask* hrrs_cleanup_task, |
2152 | 5038 bool par) { |
5039 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { | |
5040 if (hr->isHumongous()) { | |
5041 assert(hr->startsHumongous(), "we should only see starts humongous"); | |
5042 free_humongous_region(hr, pre_used, free_list, humongous_proxy_set, par); | |
5043 } else { | |
5044 free_region(hr, pre_used, free_list, par); | |
342 | 5045 } |
2173 | 5046 } else { |
5047 hr->rem_set()->do_cleanup_work(hrrs_cleanup_task); | |
342 | 5048 } |
5049 } | |
5050 | |
2152 | 5051 void G1CollectedHeap::free_region(HeapRegion* hr, |
5052 size_t* pre_used, | |
5053 FreeRegionList* free_list, | |
5054 bool par) { | |
5055 assert(!hr->isHumongous(), "this is only for non-humongous regions"); | |
5056 assert(!hr->is_empty(), "the region should not be empty"); | |
5057 assert(free_list != NULL, "pre-condition"); | |
5058 | |
5059 *pre_used += hr->used(); | |
5060 hr->hr_clear(par, true /* clear_space */); | |
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455328d90876
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2369
diff
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|
5061 free_list->add_as_head(hr); |
2152 | 5062 } |
5063 | |
5064 void G1CollectedHeap::free_humongous_region(HeapRegion* hr, | |
5065 size_t* pre_used, | |
5066 FreeRegionList* free_list, | |
5067 HumongousRegionSet* humongous_proxy_set, | |
5068 bool par) { | |
5069 assert(hr->startsHumongous(), "this is only for starts humongous regions"); | |
5070 assert(free_list != NULL, "pre-condition"); | |
5071 assert(humongous_proxy_set != NULL, "pre-condition"); | |
5072 | |
5073 size_t hr_used = hr->used(); | |
5074 size_t hr_capacity = hr->capacity(); | |
5075 size_t hr_pre_used = 0; | |
5076 _humongous_set.remove_with_proxy(hr, humongous_proxy_set); | |
5077 hr->set_notHumongous(); | |
5078 free_region(hr, &hr_pre_used, free_list, par); | |
5079 | |
3766 | 5080 size_t i = hr->hrs_index() + 1; |
2152 | 5081 size_t num = 1; |
3766 | 5082 while (i < n_regions()) { |
5083 HeapRegion* curr_hr = region_at(i); | |
2152 | 5084 if (!curr_hr->continuesHumongous()) { |
5085 break; | |
5086 } | |
5087 curr_hr->set_notHumongous(); | |
5088 free_region(curr_hr, &hr_pre_used, free_list, par); | |
5089 num += 1; | |
5090 i += 1; | |
5091 } | |
5092 assert(hr_pre_used == hr_used, | |
5093 err_msg("hr_pre_used: "SIZE_FORMAT" and hr_used: "SIZE_FORMAT" " | |
5094 "should be the same", hr_pre_used, hr_used)); | |
5095 *pre_used += hr_pre_used; | |
5096 } | |
5097 | |
5098 void G1CollectedHeap::update_sets_after_freeing_regions(size_t pre_used, | |
5099 FreeRegionList* free_list, | |
5100 HumongousRegionSet* humongous_proxy_set, | |
5101 bool par) { | |
5102 if (pre_used > 0) { | |
5103 Mutex* lock = (par) ? ParGCRareEvent_lock : NULL; | |
342 | 5104 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); |
2152 | 5105 assert(_summary_bytes_used >= pre_used, |
5106 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" " | |
5107 "should be >= pre_used: "SIZE_FORMAT, | |
5108 _summary_bytes_used, pre_used)); | |
342 | 5109 _summary_bytes_used -= pre_used; |
2152 | 5110 } |
5111 if (free_list != NULL && !free_list->is_empty()) { | |
5112 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); | |
2432
455328d90876
7029458: G1: Add newly-reclaimed regions to the beginning of the region free list, not the end
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|
5113 _free_list.add_as_head(free_list); |
2152 | 5114 } |
5115 if (humongous_proxy_set != NULL && !humongous_proxy_set->is_empty()) { | |
5116 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
5117 _humongous_set.update_from_proxy(humongous_proxy_set); | |
342 | 5118 } |
5119 } | |
5120 | |
5121 void G1CollectedHeap::dirtyCardsForYoungRegions(CardTableModRefBS* ct_bs, HeapRegion* list) { | |
5122 while (list != NULL) { | |
5123 guarantee( list->is_young(), "invariant" ); | |
5124 | |
5125 HeapWord* bottom = list->bottom(); | |
5126 HeapWord* end = list->end(); | |
5127 MemRegion mr(bottom, end); | |
5128 ct_bs->dirty(mr); | |
5129 | |
5130 list = list->get_next_young_region(); | |
5131 } | |
5132 } | |
5133 | |
796
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|
5134 |
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5135 class G1ParCleanupCTTask : public AbstractGangTask { |
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5136 CardTableModRefBS* _ct_bs; |
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5137 G1CollectedHeap* _g1h; |
940
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5138 HeapRegion* volatile _su_head; |
796
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|
5139 public: |
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5140 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
940
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5141 G1CollectedHeap* g1h, |
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5142 HeapRegion* survivor_list) : |
796
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5143 AbstractGangTask("G1 Par Cleanup CT Task"), |
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5144 _ct_bs(ct_bs), |
940
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5145 _g1h(g1h), |
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5146 _su_head(survivor_list) |
796
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5147 { } |
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|
5148 |
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|
5149 void work(int i) { |
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5150 HeapRegion* r; |
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5151 while (r = _g1h->pop_dirty_cards_region()) { |
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5152 clear_cards(r); |
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|
5153 } |
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5154 // Redirty the cards of the survivor regions. |
940
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|
5155 dirty_list(&this->_su_head); |
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5156 } |
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|
5157 |
796
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5158 void clear_cards(HeapRegion* r) { |
1394
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5159 // Cards for Survivor regions will be dirtied later. |
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5160 if (!r->is_survivor()) { |
796
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5161 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
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5162 } |
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|
5163 } |
940
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|
5164 |
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|
5165 void dirty_list(HeapRegion* volatile * head_ptr) { |
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|
5166 HeapRegion* head; |
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|
5167 do { |
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|
5168 // Pop region off the list. |
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|
5169 head = *head_ptr; |
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5170 if (head != NULL) { |
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|
5171 HeapRegion* r = (HeapRegion*) |
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5172 Atomic::cmpxchg_ptr(head->get_next_young_region(), head_ptr, head); |
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5173 if (r == head) { |
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5174 assert(!r->isHumongous(), "Humongous regions shouldn't be on survivor list"); |
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5175 _ct_bs->dirty(MemRegion(r->bottom(), r->end())); |
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|
5176 } |
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|
5177 } |
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|
5178 } while (*head_ptr != NULL); |
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|
5179 } |
796
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|
5180 }; |
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|
5181 |
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|
5182 |
940
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|
5183 #ifndef PRODUCT |
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5184 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
3317
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|
5185 G1CollectedHeap* _g1h; |
940
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|
5186 CardTableModRefBS* _ct_bs; |
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|
5187 public: |
3317
063382f9b575
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|
5188 G1VerifyCardTableCleanup(G1CollectedHeap* g1h, CardTableModRefBS* ct_bs) |
063382f9b575
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5189 : _g1h(g1h), _ct_bs(ct_bs) { } |
2433
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2432
diff
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|
5190 virtual bool doHeapRegion(HeapRegion* r) { |
1394
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|
5191 if (r->is_survivor()) { |
3317
063382f9b575
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|
5192 _g1h->verify_dirty_region(r); |
940
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|
5193 } else { |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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3293
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|
5194 _g1h->verify_not_dirty_region(r); |
940
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|
5195 } |
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|
5196 return false; |
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diff
changeset
|
5197 } |
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diff
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|
5198 }; |
2433
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|
5199 |
3317
063382f9b575
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|
5200 void G1CollectedHeap::verify_not_dirty_region(HeapRegion* hr) { |
063382f9b575
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|
5201 // All of the region should be clean. |
063382f9b575
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|
5202 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); |
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|
5203 MemRegion mr(hr->bottom(), hr->end()); |
063382f9b575
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|
5204 ct_bs->verify_not_dirty_region(mr); |
063382f9b575
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|
5205 } |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
changeset
|
5206 |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5207 void G1CollectedHeap::verify_dirty_region(HeapRegion* hr) { |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5208 // We cannot guarantee that [bottom(),end()] is dirty. Threads |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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changeset
|
5209 // dirty allocated blocks as they allocate them. The thread that |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
changeset
|
5210 // retires each region and replaces it with a new one will do a |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5211 // maximal allocation to fill in [pre_dummy_top(),end()] but will |
063382f9b575
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|
5212 // not dirty that area (one less thing to have to do while holding |
063382f9b575
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|
5213 // a lock). So we can only verify that [bottom(),pre_dummy_top()] |
063382f9b575
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|
5214 // is dirty. |
063382f9b575
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changeset
|
5215 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
063382f9b575
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|
5216 MemRegion mr(hr->bottom(), hr->pre_dummy_top()); |
063382f9b575
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|
5217 ct_bs->verify_dirty_region(mr); |
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|
5218 } |
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|
5219 |
2433
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|
5220 void G1CollectedHeap::verify_dirty_young_list(HeapRegion* head) { |
3317
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|
5221 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
2433
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|
5222 for (HeapRegion* hr = head; hr != NULL; hr = hr->get_next_young_region()) { |
3317
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|
5223 verify_dirty_region(hr); |
2433
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|
5224 } |
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diff
changeset
|
5225 } |
abdfc822206f
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diff
changeset
|
5226 |
abdfc822206f
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diff
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|
5227 void G1CollectedHeap::verify_dirty_young_regions() { |
abdfc822206f
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2432
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|
5228 verify_dirty_young_list(_young_list->first_region()); |
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|
5229 verify_dirty_young_list(_young_list->first_survivor_region()); |
abdfc822206f
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|
5230 } |
940
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|
5231 #endif |
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|
5232 |
342 | 5233 void G1CollectedHeap::cleanUpCardTable() { |
5234 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
5235 double start = os::elapsedTime(); | |
5236 | |
796
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|
5237 // Iterate over the dirty cards region list. |
940
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|
5238 G1ParCleanupCTTask cleanup_task(ct_bs, this, |
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|
5239 _young_list->first_survivor_region()); |
1394
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|
5240 |
796
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|
5241 if (ParallelGCThreads > 0) { |
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|
5242 set_par_threads(workers()->total_workers()); |
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794
diff
changeset
|
5243 workers()->run_task(&cleanup_task); |
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diff
changeset
|
5244 set_par_threads(0); |
29e7d79232b9
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diff
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|
5245 } else { |
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|
5246 while (_dirty_cards_region_list) { |
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794
diff
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|
5247 HeapRegion* r = _dirty_cards_region_list; |
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794
diff
changeset
|
5248 cleanup_task.clear_cards(r); |
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5249 _dirty_cards_region_list = r->get_next_dirty_cards_region(); |
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5250 if (_dirty_cards_region_list == r) { |
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5251 // The last region. |
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5252 _dirty_cards_region_list = NULL; |
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5253 } |
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5254 r->set_next_dirty_cards_region(NULL); |
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5255 } |
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5256 // now, redirty the cards of the survivor regions |
940
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5257 // (it seemed faster to do it this way, instead of iterating over |
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5258 // all regions and then clearing / dirtying as appropriate) |
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5259 dirtyCardsForYoungRegions(ct_bs, _young_list->first_survivor_region()); |
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5260 } |
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5261 |
342 | 5262 double elapsed = os::elapsedTime() - start; |
5263 g1_policy()->record_clear_ct_time( elapsed * 1000.0); | |
940
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5264 #ifndef PRODUCT |
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5265 if (G1VerifyCTCleanup || VerifyAfterGC) { |
3317
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5266 G1VerifyCardTableCleanup cleanup_verifier(this, ct_bs); |
940
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5267 heap_region_iterate(&cleanup_verifier); |
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5268 } |
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5269 #endif |
342 | 5270 } |
5271 | |
5272 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
2152 | 5273 size_t pre_used = 0; |
5274 FreeRegionList local_free_list("Local List for CSet Freeing"); | |
5275 | |
342 | 5276 double young_time_ms = 0.0; |
5277 double non_young_time_ms = 0.0; | |
5278 | |
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5279 // Since the collection set is a superset of the the young list, |
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5280 // all we need to do to clear the young list is clear its |
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5281 // head and length, and unlink any young regions in the code below |
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5282 _young_list->clear(); |
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5283 |
342 | 5284 G1CollectorPolicy* policy = g1_policy(); |
5285 | |
5286 double start_sec = os::elapsedTime(); | |
5287 bool non_young = true; | |
5288 | |
5289 HeapRegion* cur = cs_head; | |
5290 int age_bound = -1; | |
5291 size_t rs_lengths = 0; | |
5292 | |
5293 while (cur != NULL) { | |
2361 | 5294 assert(!is_on_master_free_list(cur), "sanity"); |
2152 | 5295 |
342 | 5296 if (non_young) { |
5297 if (cur->is_young()) { | |
5298 double end_sec = os::elapsedTime(); | |
5299 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
5300 non_young_time_ms += elapsed_ms; | |
5301 | |
5302 start_sec = os::elapsedTime(); | |
5303 non_young = false; | |
5304 } | |
5305 } else { | |
2152 | 5306 double end_sec = os::elapsedTime(); |
5307 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
5308 young_time_ms += elapsed_ms; | |
5309 | |
5310 start_sec = os::elapsedTime(); | |
5311 non_young = true; | |
342 | 5312 } |
5313 | |
5314 rs_lengths += cur->rem_set()->occupied(); | |
5315 | |
5316 HeapRegion* next = cur->next_in_collection_set(); | |
5317 assert(cur->in_collection_set(), "bad CS"); | |
5318 cur->set_next_in_collection_set(NULL); | |
5319 cur->set_in_collection_set(false); | |
5320 | |
5321 if (cur->is_young()) { | |
5322 int index = cur->young_index_in_cset(); | |
5323 guarantee( index != -1, "invariant" ); | |
5324 guarantee( (size_t)index < policy->young_cset_length(), "invariant" ); | |
5325 size_t words_survived = _surviving_young_words[index]; | |
5326 cur->record_surv_words_in_group(words_survived); | |
1394
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5327 |
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5328 // At this point the we have 'popped' cur from the collection set |
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5329 // (linked via next_in_collection_set()) but it is still in the |
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5330 // young list (linked via next_young_region()). Clear the |
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5331 // _next_young_region field. |
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5332 cur->set_next_young_region(NULL); |
342 | 5333 } else { |
5334 int index = cur->young_index_in_cset(); | |
5335 guarantee( index == -1, "invariant" ); | |
5336 } | |
5337 | |
5338 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
5339 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
5340 "invariant" ); | |
5341 | |
5342 if (!cur->evacuation_failed()) { | |
5343 // And the region is empty. | |
2152 | 5344 assert(!cur->is_empty(), "Should not have empty regions in a CS."); |
5345 free_region(cur, &pre_used, &local_free_list, false /* par */); | |
342 | 5346 } else { |
5347 cur->uninstall_surv_rate_group(); | |
5348 if (cur->is_young()) | |
5349 cur->set_young_index_in_cset(-1); | |
5350 cur->set_not_young(); | |
5351 cur->set_evacuation_failed(false); | |
5352 } | |
5353 cur = next; | |
5354 } | |
5355 | |
5356 policy->record_max_rs_lengths(rs_lengths); | |
5357 policy->cset_regions_freed(); | |
5358 | |
5359 double end_sec = os::elapsedTime(); | |
5360 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
5361 if (non_young) | |
5362 non_young_time_ms += elapsed_ms; | |
5363 else | |
5364 young_time_ms += elapsed_ms; | |
5365 | |
2152 | 5366 update_sets_after_freeing_regions(pre_used, &local_free_list, |
5367 NULL /* humongous_proxy_set */, | |
5368 false /* par */); | |
342 | 5369 policy->record_young_free_cset_time_ms(young_time_ms); |
5370 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
5371 } | |
5372 | |
1394
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5373 // This routine is similar to the above but does not record |
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5374 // any policy statistics or update free lists; we are abandoning |
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5375 // the current incremental collection set in preparation of a |
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5376 // full collection. After the full GC we will start to build up |
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5377 // the incremental collection set again. |
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5378 // This is only called when we're doing a full collection |
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5379 // and is immediately followed by the tearing down of the young list. |
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5380 |
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5381 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
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5382 HeapRegion* cur = cs_head; |
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5383 |
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|
5384 while (cur != NULL) { |
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5385 HeapRegion* next = cur->next_in_collection_set(); |
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5386 assert(cur->in_collection_set(), "bad CS"); |
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5387 cur->set_next_in_collection_set(NULL); |
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5388 cur->set_in_collection_set(false); |
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|
5389 cur->set_young_index_in_cset(-1); |
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5390 cur = next; |
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|
5391 } |
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|
5392 } |
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|
5393 |
2152 | 5394 void G1CollectedHeap::set_free_regions_coming() { |
5395 if (G1ConcRegionFreeingVerbose) { | |
5396 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
5397 "setting free regions coming"); | |
5398 } | |
5399 | |
5400 assert(!free_regions_coming(), "pre-condition"); | |
5401 _free_regions_coming = true; | |
342 | 5402 } |
5403 | |
2152 | 5404 void G1CollectedHeap::reset_free_regions_coming() { |
5405 { | |
5406 assert(free_regions_coming(), "pre-condition"); | |
5407 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
5408 _free_regions_coming = false; | |
5409 SecondaryFreeList_lock->notify_all(); | |
5410 } | |
5411 | |
5412 if (G1ConcRegionFreeingVerbose) { | |
5413 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
5414 "reset free regions coming"); | |
342 | 5415 } |
5416 } | |
5417 | |
2152 | 5418 void G1CollectedHeap::wait_while_free_regions_coming() { |
5419 // Most of the time we won't have to wait, so let's do a quick test | |
5420 // first before we take the lock. | |
5421 if (!free_regions_coming()) { | |
5422 return; | |
5423 } | |
5424 | |
5425 if (G1ConcRegionFreeingVerbose) { | |
5426 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
5427 "waiting for free regions"); | |
342 | 5428 } |
5429 | |
5430 { | |
2152 | 5431 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
5432 while (free_regions_coming()) { | |
5433 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
342 | 5434 } |
2152 | 5435 } |
5436 | |
5437 if (G1ConcRegionFreeingVerbose) { | |
5438 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
5439 "done waiting for free regions"); | |
5440 } | |
342 | 5441 } |
5442 | |
5443 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
5444 assert(heap_lock_held_for_gc(), | |
5445 "the heap lock should already be held by or for this thread"); | |
5446 _young_list->push_region(hr); | |
5447 g1_policy()->set_region_short_lived(hr); | |
5448 } | |
5449 | |
5450 class NoYoungRegionsClosure: public HeapRegionClosure { | |
5451 private: | |
5452 bool _success; | |
5453 public: | |
5454 NoYoungRegionsClosure() : _success(true) { } | |
5455 bool doHeapRegion(HeapRegion* r) { | |
5456 if (r->is_young()) { | |
5457 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
5458 r->bottom(), r->end()); | |
5459 _success = false; | |
5460 } | |
5461 return false; | |
5462 } | |
5463 bool success() { return _success; } | |
5464 }; | |
5465 | |
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5466 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
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5467 bool ret = _young_list->check_list_empty(check_sample); |
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5468 |
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5469 if (check_heap) { |
342 | 5470 NoYoungRegionsClosure closure; |
5471 heap_region_iterate(&closure); | |
5472 ret = ret && closure.success(); | |
5473 } | |
5474 | |
5475 return ret; | |
5476 } | |
5477 | |
5478 void G1CollectedHeap::empty_young_list() { | |
5479 assert(heap_lock_held_for_gc(), | |
5480 "the heap lock should already be held by or for this thread"); | |
5481 assert(g1_policy()->in_young_gc_mode(), "should be in young GC mode"); | |
5482 | |
5483 _young_list->empty_list(); | |
5484 } | |
5485 | |
5486 bool G1CollectedHeap::all_alloc_regions_no_allocs_since_save_marks() { | |
5487 bool no_allocs = true; | |
5488 for (int ap = 0; ap < GCAllocPurposeCount && no_allocs; ++ap) { | |
5489 HeapRegion* r = _gc_alloc_regions[ap]; | |
5490 no_allocs = r == NULL || r->saved_mark_at_top(); | |
5491 } | |
5492 return no_allocs; | |
5493 } | |
5494 | |
545 | 5495 void G1CollectedHeap::retire_all_alloc_regions() { |
342 | 5496 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
5497 HeapRegion* r = _gc_alloc_regions[ap]; | |
5498 if (r != NULL) { | |
5499 // Check for aliases. | |
5500 bool has_processed_alias = false; | |
5501 for (int i = 0; i < ap; ++i) { | |
5502 if (_gc_alloc_regions[i] == r) { | |
5503 has_processed_alias = true; | |
5504 break; | |
5505 } | |
5506 } | |
5507 if (!has_processed_alias) { | |
545 | 5508 retire_alloc_region(r, false /* par */); |
342 | 5509 } |
5510 } | |
5511 } | |
5512 } | |
5513 | |
5514 // Done at the start of full GC. | |
5515 void G1CollectedHeap::tear_down_region_lists() { | |
2152 | 5516 _free_list.remove_all(); |
342 | 5517 } |
5518 | |
5519 class RegionResetter: public HeapRegionClosure { | |
2152 | 5520 G1CollectedHeap* _g1h; |
5521 FreeRegionList _local_free_list; | |
5522 | |
342 | 5523 public: |
2152 | 5524 RegionResetter() : _g1h(G1CollectedHeap::heap()), |
5525 _local_free_list("Local Free List for RegionResetter") { } | |
5526 | |
342 | 5527 bool doHeapRegion(HeapRegion* r) { |
5528 if (r->continuesHumongous()) return false; | |
5529 if (r->top() > r->bottom()) { | |
5530 if (r->top() < r->end()) { | |
5531 Copy::fill_to_words(r->top(), | |
5532 pointer_delta(r->end(), r->top())); | |
5533 } | |
5534 } else { | |
5535 assert(r->is_empty(), "tautology"); | |
2152 | 5536 _local_free_list.add_as_tail(r); |
342 | 5537 } |
5538 return false; | |
5539 } | |
5540 | |
2152 | 5541 void update_free_lists() { |
5542 _g1h->update_sets_after_freeing_regions(0, &_local_free_list, NULL, | |
5543 false /* par */); | |
5544 } | |
342 | 5545 }; |
5546 | |
5547 // Done at the end of full GC. | |
5548 void G1CollectedHeap::rebuild_region_lists() { | |
5549 // This needs to go at the end of the full GC. | |
5550 RegionResetter rs; | |
5551 heap_region_iterate(&rs); | |
2152 | 5552 rs.update_free_lists(); |
342 | 5553 } |
5554 | |
5555 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
5556 _refine_cte_cl->set_concurrent(concurrent); | |
5557 } | |
5558 | |
5559 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
5560 HeapRegion* hr = heap_region_containing(p); | |
5561 if (hr == NULL) { | |
5562 return is_in_permanent(p); | |
5563 } else { | |
5564 return hr->is_in(p); | |
5565 } | |
5566 } | |
2152 | 5567 |
2433
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5568 HeapRegion* G1CollectedHeap::new_mutator_alloc_region(size_t word_size, |
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5569 bool force) { |
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5570 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
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5571 assert(!force || g1_policy()->can_expand_young_list(), |
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5572 "if force is true we should be able to expand the young list"); |
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5573 bool young_list_full = g1_policy()->is_young_list_full(); |
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5574 if (force || !young_list_full) { |
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5575 HeapRegion* new_alloc_region = new_region(word_size, |
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5576 false /* do_expand */); |
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5577 if (new_alloc_region != NULL) { |
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5578 g1_policy()->update_region_num(true /* next_is_young */); |
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5579 set_region_short_lived_locked(new_alloc_region); |
3778
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5580 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Eden, young_list_full); |
3289
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5581 g1mm()->update_eden_counters(); |
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5582 return new_alloc_region; |
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5583 } |
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5584 } |
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5585 return NULL; |
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5586 } |
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5587 |
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5588 void G1CollectedHeap::retire_mutator_alloc_region(HeapRegion* alloc_region, |
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5589 size_t allocated_bytes) { |
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5590 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
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5591 assert(alloc_region->is_young(), "all mutator alloc regions should be young"); |
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5592 |
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5593 g1_policy()->add_region_to_incremental_cset_lhs(alloc_region); |
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5594 _summary_bytes_used += allocated_bytes; |
3778
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5595 _hr_printer.retire(alloc_region); |
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5596 } |
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5597 |
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5598 HeapRegion* MutatorAllocRegion::allocate_new_region(size_t word_size, |
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5599 bool force) { |
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5600 return _g1h->new_mutator_alloc_region(word_size, force); |
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5601 } |
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5602 |
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5603 void MutatorAllocRegion::retire_region(HeapRegion* alloc_region, |
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5604 size_t allocated_bytes) { |
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5605 _g1h->retire_mutator_alloc_region(alloc_region, allocated_bytes); |
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5606 } |
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5607 |
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5608 // Heap region set verification |
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5609 |
2152 | 5610 class VerifyRegionListsClosure : public HeapRegionClosure { |
5611 private: | |
5612 HumongousRegionSet* _humongous_set; | |
5613 FreeRegionList* _free_list; | |
5614 size_t _region_count; | |
5615 | |
5616 public: | |
5617 VerifyRegionListsClosure(HumongousRegionSet* humongous_set, | |
5618 FreeRegionList* free_list) : | |
5619 _humongous_set(humongous_set), _free_list(free_list), | |
5620 _region_count(0) { } | |
5621 | |
5622 size_t region_count() { return _region_count; } | |
5623 | |
5624 bool doHeapRegion(HeapRegion* hr) { | |
5625 _region_count += 1; | |
5626 | |
5627 if (hr->continuesHumongous()) { | |
5628 return false; | |
5629 } | |
5630 | |
5631 if (hr->is_young()) { | |
5632 // TODO | |
5633 } else if (hr->startsHumongous()) { | |
5634 _humongous_set->verify_next_region(hr); | |
5635 } else if (hr->is_empty()) { | |
5636 _free_list->verify_next_region(hr); | |
5637 } | |
5638 return false; | |
5639 } | |
5640 }; | |
5641 | |
3766 | 5642 HeapRegion* G1CollectedHeap::new_heap_region(size_t hrs_index, |
5643 HeapWord* bottom) { | |
5644 HeapWord* end = bottom + HeapRegion::GrainWords; | |
5645 MemRegion mr(bottom, end); | |
5646 assert(_g1_reserved.contains(mr), "invariant"); | |
5647 // This might return NULL if the allocation fails | |
5648 return new HeapRegion(hrs_index, _bot_shared, mr, true /* is_zeroed */); | |
5649 } | |
5650 | |
2152 | 5651 void G1CollectedHeap::verify_region_sets() { |
5652 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); | |
5653 | |
5654 // First, check the explicit lists. | |
5655 _free_list.verify(); | |
5656 { | |
5657 // Given that a concurrent operation might be adding regions to | |
5658 // the secondary free list we have to take the lock before | |
5659 // verifying it. | |
5660 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
5661 _secondary_free_list.verify(); | |
5662 } | |
5663 _humongous_set.verify(); | |
5664 | |
5665 // If a concurrent region freeing operation is in progress it will | |
5666 // be difficult to correctly attributed any free regions we come | |
5667 // across to the correct free list given that they might belong to | |
5668 // one of several (free_list, secondary_free_list, any local lists, | |
5669 // etc.). So, if that's the case we will skip the rest of the | |
5670 // verification operation. Alternatively, waiting for the concurrent | |
5671 // operation to complete will have a non-trivial effect on the GC's | |
5672 // operation (no concurrent operation will last longer than the | |
5673 // interval between two calls to verification) and it might hide | |
5674 // any issues that we would like to catch during testing. | |
5675 if (free_regions_coming()) { | |
5676 return; | |
5677 } | |
5678 | |
2361 | 5679 // Make sure we append the secondary_free_list on the free_list so |
5680 // that all free regions we will come across can be safely | |
5681 // attributed to the free_list. | |
5682 append_secondary_free_list_if_not_empty_with_lock(); | |
2152 | 5683 |
5684 // Finally, make sure that the region accounting in the lists is | |
5685 // consistent with what we see in the heap. | |
5686 _humongous_set.verify_start(); | |
5687 _free_list.verify_start(); | |
5688 | |
5689 VerifyRegionListsClosure cl(&_humongous_set, &_free_list); | |
5690 heap_region_iterate(&cl); | |
5691 | |
5692 _humongous_set.verify_end(); | |
5693 _free_list.verify_end(); | |
342 | 5694 } |