Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 4073:53074c2c4600
7099849: G1: include heap region information in hs_err files
Reviewed-by: johnc, brutisso, poonam
| author | tonyp |
|---|---|
| date | Tue, 08 Nov 2011 00:41:28 -0500 |
| parents | 8aae2050e83e |
| children | a88de71c4e3a |
| rev | line source |
|---|---|
| 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" | |
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34 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
| 1972 | 35 #include "gc_implementation/g1/g1MarkSweep.hpp" |
| 36 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
| 37 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
| 38 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
| 39 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
| 40 #include "gc_implementation/g1/vm_operations_g1.hpp" | |
| 41 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
| 42 #include "memory/gcLocker.inline.hpp" | |
| 43 #include "memory/genOopClosures.inline.hpp" | |
| 44 #include "memory/generationSpec.hpp" | |
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45 #include "memory/referenceProcessor.hpp" |
| 1972 | 46 #include "oops/oop.inline.hpp" |
| 47 #include "oops/oop.pcgc.inline.hpp" | |
| 48 #include "runtime/aprofiler.hpp" | |
| 49 #include "runtime/vmThread.hpp" | |
| 342 | 50 |
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51 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0; |
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52 |
| 342 | 53 // turn it on so that the contents of the young list (scan-only / |
| 54 // to-be-collected) are printed at "strategic" points before / during | |
| 55 // / after the collection --- this is useful for debugging | |
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56 #define YOUNG_LIST_VERBOSE 0 |
| 342 | 57 // CURRENT STATUS |
| 58 // This file is under construction. Search for "FIXME". | |
| 59 | |
| 60 // INVARIANTS/NOTES | |
| 61 // | |
| 62 // All allocation activity covered by the G1CollectedHeap interface is | |
| 1973 | 63 // serialized by acquiring the HeapLock. This happens in mem_allocate |
| 64 // and allocate_new_tlab, which are the "entry" points to the | |
| 65 // allocation code from the rest of the JVM. (Note that this does not | |
| 66 // apply to TLAB allocation, which is not part of this interface: it | |
| 67 // is done by clients of this interface.) | |
| 342 | 68 |
| 69 // Local to this file. | |
| 70 | |
| 71 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
| 72 SuspendibleThreadSet* _sts; | |
| 73 G1RemSet* _g1rs; | |
| 74 ConcurrentG1Refine* _cg1r; | |
| 75 bool _concurrent; | |
| 76 public: | |
| 77 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
| 78 G1RemSet* g1rs, | |
| 79 ConcurrentG1Refine* cg1r) : | |
| 80 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
| 81 {} | |
| 82 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 1705 | 83 bool oops_into_cset = _g1rs->concurrentRefineOneCard(card_ptr, worker_i, false); |
| 84 // This path is executed by the concurrent refine or mutator threads, | |
| 85 // concurrently, and so we do not care if card_ptr contains references | |
| 86 // that point into the collection set. | |
| 87 assert(!oops_into_cset, "should be"); | |
| 88 | |
| 342 | 89 if (_concurrent && _sts->should_yield()) { |
| 90 // Caller will actually yield. | |
| 91 return false; | |
| 92 } | |
| 93 // Otherwise, we finished successfully; return true. | |
| 94 return true; | |
| 95 } | |
| 96 void set_concurrent(bool b) { _concurrent = b; } | |
| 97 }; | |
| 98 | |
| 99 | |
| 100 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 101 int _calls; | |
| 102 G1CollectedHeap* _g1h; | |
| 103 CardTableModRefBS* _ctbs; | |
| 104 int _histo[256]; | |
| 105 public: | |
| 106 ClearLoggedCardTableEntryClosure() : | |
| 107 _calls(0) | |
| 108 { | |
| 109 _g1h = G1CollectedHeap::heap(); | |
| 110 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 111 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
| 112 } | |
| 113 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 114 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 115 _calls++; | |
| 116 unsigned char* ujb = (unsigned char*)card_ptr; | |
| 117 int ind = (int)(*ujb); | |
| 118 _histo[ind]++; | |
| 119 *card_ptr = -1; | |
| 120 } | |
| 121 return true; | |
| 122 } | |
| 123 int calls() { return _calls; } | |
| 124 void print_histo() { | |
| 125 gclog_or_tty->print_cr("Card table value histogram:"); | |
| 126 for (int i = 0; i < 256; i++) { | |
| 127 if (_histo[i] != 0) { | |
| 128 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
| 129 } | |
| 130 } | |
| 131 } | |
| 132 }; | |
| 133 | |
| 134 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 135 int _calls; | |
| 136 G1CollectedHeap* _g1h; | |
| 137 CardTableModRefBS* _ctbs; | |
| 138 public: | |
| 139 RedirtyLoggedCardTableEntryClosure() : | |
| 140 _calls(0) | |
| 141 { | |
| 142 _g1h = G1CollectedHeap::heap(); | |
| 143 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 144 } | |
| 145 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 146 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 147 _calls++; | |
| 148 *card_ptr = 0; | |
| 149 } | |
| 150 return true; | |
| 151 } | |
| 152 int calls() { return _calls; } | |
| 153 }; | |
| 154 | |
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155 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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156 public: |
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157 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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158 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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159 return true; |
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160 } |
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161 }; |
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162 |
| 342 | 163 YoungList::YoungList(G1CollectedHeap* g1h) |
| 164 : _g1h(g1h), _head(NULL), | |
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165 _length(0), |
| 342 | 166 _last_sampled_rs_lengths(0), |
| 545 | 167 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) |
| 342 | 168 { |
| 169 guarantee( check_list_empty(false), "just making sure..." ); | |
| 170 } | |
| 171 | |
| 172 void YoungList::push_region(HeapRegion *hr) { | |
| 173 assert(!hr->is_young(), "should not already be young"); | |
| 174 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
| 175 | |
| 176 hr->set_next_young_region(_head); | |
| 177 _head = hr; | |
| 178 | |
| 179 hr->set_young(); | |
| 180 double yg_surv_rate = _g1h->g1_policy()->predict_yg_surv_rate((int)_length); | |
| 181 ++_length; | |
| 182 } | |
| 183 | |
| 184 void YoungList::add_survivor_region(HeapRegion* hr) { | |
| 545 | 185 assert(hr->is_survivor(), "should be flagged as survivor region"); |
| 342 | 186 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
| 187 | |
| 188 hr->set_next_young_region(_survivor_head); | |
| 189 if (_survivor_head == NULL) { | |
| 545 | 190 _survivor_tail = hr; |
| 342 | 191 } |
| 192 _survivor_head = hr; | |
| 193 | |
| 194 ++_survivor_length; | |
| 195 } | |
| 196 | |
| 197 void YoungList::empty_list(HeapRegion* list) { | |
| 198 while (list != NULL) { | |
| 199 HeapRegion* next = list->get_next_young_region(); | |
| 200 list->set_next_young_region(NULL); | |
| 201 list->uninstall_surv_rate_group(); | |
| 202 list->set_not_young(); | |
| 203 list = next; | |
| 204 } | |
| 205 } | |
| 206 | |
| 207 void YoungList::empty_list() { | |
| 208 assert(check_list_well_formed(), "young list should be well formed"); | |
| 209 | |
| 210 empty_list(_head); | |
| 211 _head = NULL; | |
| 212 _length = 0; | |
| 213 | |
| 214 empty_list(_survivor_head); | |
| 215 _survivor_head = NULL; | |
| 545 | 216 _survivor_tail = NULL; |
| 342 | 217 _survivor_length = 0; |
| 218 | |
| 219 _last_sampled_rs_lengths = 0; | |
| 220 | |
| 221 assert(check_list_empty(false), "just making sure..."); | |
| 222 } | |
| 223 | |
| 224 bool YoungList::check_list_well_formed() { | |
| 225 bool ret = true; | |
| 226 | |
| 227 size_t length = 0; | |
| 228 HeapRegion* curr = _head; | |
| 229 HeapRegion* last = NULL; | |
| 230 while (curr != NULL) { | |
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231 if (!curr->is_young()) { |
| 342 | 232 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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233 "incorrectly tagged (y: %d, surv: %d)", |
| 342 | 234 curr->bottom(), curr->end(), |
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235 curr->is_young(), curr->is_survivor()); |
| 342 | 236 ret = false; |
| 237 } | |
| 238 ++length; | |
| 239 last = curr; | |
| 240 curr = curr->get_next_young_region(); | |
| 241 } | |
| 242 ret = ret && (length == _length); | |
| 243 | |
| 244 if (!ret) { | |
| 245 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
| 246 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
| 247 length, _length); | |
| 248 } | |
| 249 | |
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250 return ret; |
| 342 | 251 } |
| 252 | |
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253 bool YoungList::check_list_empty(bool check_sample) { |
| 342 | 254 bool ret = true; |
| 255 | |
| 256 if (_length != 0) { | |
| 257 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
| 258 _length); | |
| 259 ret = false; | |
| 260 } | |
| 261 if (check_sample && _last_sampled_rs_lengths != 0) { | |
| 262 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
| 263 ret = false; | |
| 264 } | |
| 265 if (_head != NULL) { | |
| 266 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
| 267 ret = false; | |
| 268 } | |
| 269 if (!ret) { | |
| 270 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
| 271 } | |
| 272 | |
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273 return ret; |
| 342 | 274 } |
| 275 | |
| 276 void | |
| 277 YoungList::rs_length_sampling_init() { | |
| 278 _sampled_rs_lengths = 0; | |
| 279 _curr = _head; | |
| 280 } | |
| 281 | |
| 282 bool | |
| 283 YoungList::rs_length_sampling_more() { | |
| 284 return _curr != NULL; | |
| 285 } | |
| 286 | |
| 287 void | |
| 288 YoungList::rs_length_sampling_next() { | |
| 289 assert( _curr != NULL, "invariant" ); | |
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290 size_t rs_length = _curr->rem_set()->occupied(); |
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291 |
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292 _sampled_rs_lengths += rs_length; |
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293 |
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294 // The current region may not yet have been added to the |
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295 // incremental collection set (it gets added when it is |
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296 // retired as the current allocation region). |
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297 if (_curr->in_collection_set()) { |
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298 // Update the collection set policy information for this region |
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299 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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300 } |
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301 |
| 342 | 302 _curr = _curr->get_next_young_region(); |
| 303 if (_curr == NULL) { | |
| 304 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
| 305 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
| 306 } | |
| 307 } | |
| 308 | |
| 309 void | |
| 310 YoungList::reset_auxilary_lists() { | |
| 311 guarantee( is_empty(), "young list should be empty" ); | |
| 312 assert(check_list_well_formed(), "young list should be well formed"); | |
| 313 | |
| 314 // Add survivor regions to SurvRateGroup. | |
| 315 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
| 545 | 316 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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317 |
| 342 | 318 for (HeapRegion* curr = _survivor_head; |
| 319 curr != NULL; | |
| 320 curr = curr->get_next_young_region()) { | |
| 321 _g1h->g1_policy()->set_region_survivors(curr); | |
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322 |
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323 // The region is a non-empty survivor so let's add it to |
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324 // the incremental collection set for the next evacuation |
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325 // pause. |
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326 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
| 342 | 327 } |
| 328 _g1h->g1_policy()->note_stop_adding_survivor_regions(); | |
| 329 | |
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330 _head = _survivor_head; |
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331 _length = _survivor_length; |
| 342 | 332 if (_survivor_head != NULL) { |
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333 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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334 assert(_survivor_length > 0, "invariant"); |
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335 _survivor_tail->set_next_young_region(NULL); |
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336 } |
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337 |
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338 // Don't clear the survivor list handles until the start of |
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339 // the next evacuation pause - we need it in order to re-tag |
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340 // the survivor regions from this evacuation pause as 'young' |
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341 // at the start of the next. |
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342 |
| 545 | 343 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
| 342 | 344 |
| 345 assert(check_list_well_formed(), "young list should be well formed"); | |
| 346 } | |
| 347 | |
| 348 void YoungList::print() { | |
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349 HeapRegion* lists[] = {_head, _survivor_head}; |
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350 const char* names[] = {"YOUNG", "SURVIVOR"}; |
| 342 | 351 |
| 352 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
| 353 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
| 354 HeapRegion *curr = lists[list]; | |
| 355 if (curr == NULL) | |
| 356 gclog_or_tty->print_cr(" empty"); | |
| 357 while (curr != NULL) { | |
| 358 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
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359 "age: %4d, y: %d, surv: %d", |
| 342 | 360 curr->bottom(), curr->end(), |
| 361 curr->top(), | |
| 362 curr->prev_top_at_mark_start(), | |
| 363 curr->next_top_at_mark_start(), | |
| 364 curr->top_at_conc_mark_count(), | |
| 365 curr->age_in_surv_rate_group_cond(), | |
| 366 curr->is_young(), | |
| 367 curr->is_survivor()); | |
| 368 curr = curr->get_next_young_region(); | |
| 369 } | |
| 370 } | |
| 371 | |
| 372 gclog_or_tty->print_cr(""); | |
| 373 } | |
| 374 | |
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375 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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376 { |
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377 // Claim the right to put the region on the dirty cards region list |
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378 // by installing a self pointer. |
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379 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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380 if (next == NULL) { |
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381 HeapRegion* res = (HeapRegion*) |
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382 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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383 NULL); |
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384 if (res == NULL) { |
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385 HeapRegion* head; |
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386 do { |
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387 // Put the region to the dirty cards region list. |
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388 head = _dirty_cards_region_list; |
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389 next = (HeapRegion*) |
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390 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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391 if (next == head) { |
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392 assert(hr->get_next_dirty_cards_region() == hr, |
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393 "hr->get_next_dirty_cards_region() != hr"); |
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394 if (next == NULL) { |
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395 // The last region in the list points to itself. |
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396 hr->set_next_dirty_cards_region(hr); |
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397 } else { |
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398 hr->set_next_dirty_cards_region(next); |
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399 } |
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400 } |
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401 } while (next != head); |
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402 } |
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403 } |
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404 } |
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405 |
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406 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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407 { |
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408 HeapRegion* head; |
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409 HeapRegion* hr; |
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410 do { |
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411 head = _dirty_cards_region_list; |
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412 if (head == NULL) { |
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413 return NULL; |
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414 } |
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415 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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416 if (head == new_head) { |
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417 // The last region. |
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418 new_head = NULL; |
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419 } |
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420 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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421 head); |
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422 } while (hr != head); |
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423 assert(hr != NULL, "invariant"); |
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424 hr->set_next_dirty_cards_region(NULL); |
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425 return hr; |
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426 } |
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427 |
| 342 | 428 void G1CollectedHeap::stop_conc_gc_threads() { |
| 794 | 429 _cg1r->stop(); |
| 342 | 430 _cmThread->stop(); |
| 431 } | |
| 432 | |
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433 #ifdef ASSERT |
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434 // A region is added to the collection set as it is retired |
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435 // so an address p can point to a region which will be in the |
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436 // collection set but has not yet been retired. This method |
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437 // therefore is only accurate during a GC pause after all |
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438 // regions have been retired. It is used for debugging |
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439 // to check if an nmethod has references to objects that can |
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440 // be move during a partial collection. Though it can be |
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441 // inaccurate, it is sufficient for G1 because the conservative |
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442 // implementation of is_scavengable() for G1 will indicate that |
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443 // all nmethods must be scanned during a partial collection. |
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444 bool G1CollectedHeap::is_in_partial_collection(const void* p) { |
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445 HeapRegion* hr = heap_region_containing(p); |
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446 return hr != NULL && hr->in_collection_set(); |
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447 } |
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448 #endif |
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449 |
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450 // Returns true if the reference points to an object that |
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451 // can move in an incremental collecction. |
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452 bool G1CollectedHeap::is_scavengable(const void* p) { |
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453 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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454 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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455 HeapRegion* hr = heap_region_containing(p); |
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456 if (hr == NULL) { |
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457 // perm gen (or null) |
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458 return false; |
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459 } else { |
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460 return !hr->isHumongous(); |
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461 } |
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462 } |
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463 |
| 342 | 464 void G1CollectedHeap::check_ct_logs_at_safepoint() { |
| 465 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 466 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
| 467 | |
| 468 // Count the dirty cards at the start. | |
| 469 CountNonCleanMemRegionClosure count1(this); | |
| 470 ct_bs->mod_card_iterate(&count1); | |
| 471 int orig_count = count1.n(); | |
| 472 | |
| 473 // First clear the logged cards. | |
| 474 ClearLoggedCardTableEntryClosure clear; | |
| 475 dcqs.set_closure(&clear); | |
| 476 dcqs.apply_closure_to_all_completed_buffers(); | |
| 477 dcqs.iterate_closure_all_threads(false); | |
| 478 clear.print_histo(); | |
| 479 | |
| 480 // Now ensure that there's no dirty cards. | |
| 481 CountNonCleanMemRegionClosure count2(this); | |
| 482 ct_bs->mod_card_iterate(&count2); | |
| 483 if (count2.n() != 0) { | |
| 484 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
| 485 count2.n(), orig_count); | |
| 486 } | |
| 487 guarantee(count2.n() == 0, "Card table should be clean."); | |
| 488 | |
| 489 RedirtyLoggedCardTableEntryClosure redirty; | |
| 490 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
| 491 dcqs.apply_closure_to_all_completed_buffers(); | |
| 492 dcqs.iterate_closure_all_threads(false); | |
| 493 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
| 494 clear.calls(), orig_count); | |
| 495 guarantee(redirty.calls() == clear.calls(), | |
| 496 "Or else mechanism is broken."); | |
| 497 | |
| 498 CountNonCleanMemRegionClosure count3(this); | |
| 499 ct_bs->mod_card_iterate(&count3); | |
| 500 if (count3.n() != orig_count) { | |
| 501 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
| 502 orig_count, count3.n()); | |
| 503 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
| 504 } | |
| 505 | |
| 506 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 507 } | |
| 508 | |
| 509 // Private class members. | |
| 510 | |
| 511 G1CollectedHeap* G1CollectedHeap::_g1h; | |
| 512 | |
| 513 // Private methods. | |
| 514 | |
| 2152 | 515 HeapRegion* |
| 2361 | 516 G1CollectedHeap::new_region_try_secondary_free_list() { |
| 2152 | 517 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
| 518 while (!_secondary_free_list.is_empty() || free_regions_coming()) { | |
| 519 if (!_secondary_free_list.is_empty()) { | |
| 520 if (G1ConcRegionFreeingVerbose) { | |
| 521 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 522 "secondary_free_list has "SIZE_FORMAT" entries", | |
| 523 _secondary_free_list.length()); | |
| 524 } | |
| 525 // It looks as if there are free regions available on the | |
| 526 // secondary_free_list. Let's move them to the free_list and try | |
| 527 // again to allocate from it. | |
| 528 append_secondary_free_list(); | |
| 529 | |
| 530 assert(!_free_list.is_empty(), "if the secondary_free_list was not " | |
| 531 "empty we should have moved at least one entry to the free_list"); | |
| 532 HeapRegion* res = _free_list.remove_head(); | |
| 533 if (G1ConcRegionFreeingVerbose) { | |
| 534 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 535 "allocated "HR_FORMAT" from secondary_free_list", | |
| 536 HR_FORMAT_PARAMS(res)); | |
| 537 } | |
| 538 return res; | |
| 539 } | |
| 540 | |
| 541 // Wait here until we get notifed either when (a) there are no | |
| 542 // more free regions coming or (b) some regions have been moved on | |
| 543 // the secondary_free_list. | |
| 544 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 545 } | |
| 546 | |
| 547 if (G1ConcRegionFreeingVerbose) { | |
| 548 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 549 "could not allocate from secondary_free_list"); | |
| 550 } | |
| 551 return NULL; | |
| 552 } | |
| 553 | |
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554 HeapRegion* G1CollectedHeap::new_region(size_t word_size, bool do_expand) { |
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555 assert(!isHumongous(word_size) || word_size <= HeapRegion::GrainWords, |
| 2152 | 556 "the only time we use this to allocate a humongous region is " |
| 557 "when we are allocating a single humongous region"); | |
| 558 | |
| 559 HeapRegion* res; | |
| 560 if (G1StressConcRegionFreeing) { | |
| 561 if (!_secondary_free_list.is_empty()) { | |
| 562 if (G1ConcRegionFreeingVerbose) { | |
| 563 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 564 "forced to look at the secondary_free_list"); | |
| 565 } | |
| 2361 | 566 res = new_region_try_secondary_free_list(); |
| 2152 | 567 if (res != NULL) { |
| 568 return res; | |
| 569 } | |
| 570 } | |
| 571 } | |
| 572 res = _free_list.remove_head_or_null(); | |
| 573 if (res == NULL) { | |
| 574 if (G1ConcRegionFreeingVerbose) { | |
| 575 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 576 "res == NULL, trying the secondary_free_list"); | |
| 577 } | |
| 2361 | 578 res = new_region_try_secondary_free_list(); |
| 2152 | 579 } |
| 342 | 580 if (res == NULL && do_expand) { |
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581 ergo_verbose1(ErgoHeapSizing, |
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582 "attempt heap expansion", |
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583 ergo_format_reason("region allocation request failed") |
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584 ergo_format_byte("allocation request"), |
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585 word_size * HeapWordSize); |
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586 if (expand(word_size * HeapWordSize)) { |
| 3766 | 587 // Even though the heap was expanded, it might not have reached |
| 588 // the desired size. So, we cannot assume that the allocation | |
| 589 // will succeed. | |
| 590 res = _free_list.remove_head_or_null(); | |
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591 } |
| 342 | 592 } |
| 593 return res; | |
| 594 } | |
| 595 | |
| 3766 | 596 size_t G1CollectedHeap::humongous_obj_allocate_find_first(size_t num_regions, |
| 597 size_t word_size) { | |
| 2361 | 598 assert(isHumongous(word_size), "word_size should be humongous"); |
| 599 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
| 600 | |
| 3766 | 601 size_t first = G1_NULL_HRS_INDEX; |
| 2152 | 602 if (num_regions == 1) { |
| 603 // Only one region to allocate, no need to go through the slower | |
| 604 // path. The caller will attempt the expasion if this fails, so | |
| 605 // let's not try to expand here too. | |
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606 HeapRegion* hr = new_region(word_size, false /* do_expand */); |
| 2152 | 607 if (hr != NULL) { |
| 608 first = hr->hrs_index(); | |
| 609 } else { | |
| 3766 | 610 first = G1_NULL_HRS_INDEX; |
| 2152 | 611 } |
| 612 } else { | |
| 613 // We can't allocate humongous regions while cleanupComplete() is | |
| 614 // running, since some of the regions we find to be empty might not | |
| 615 // yet be added to the free list and it is not straightforward to | |
| 616 // know which list they are on so that we can remove them. Note | |
| 617 // that we only need to do this if we need to allocate more than | |
| 618 // one region to satisfy the current humongous allocation | |
| 619 // request. If we are only allocating one region we use the common | |
| 620 // region allocation code (see above). | |
| 621 wait_while_free_regions_coming(); | |
| 2361 | 622 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 623 |
| 624 if (free_regions() >= num_regions) { | |
| 3766 | 625 first = _hrs.find_contiguous(num_regions); |
| 626 if (first != G1_NULL_HRS_INDEX) { | |
| 627 for (size_t i = first; i < first + num_regions; ++i) { | |
| 628 HeapRegion* hr = region_at(i); | |
| 2152 | 629 assert(hr->is_empty(), "sanity"); |
| 2361 | 630 assert(is_on_master_free_list(hr), "sanity"); |
| 2152 | 631 hr->set_pending_removal(true); |
| 632 } | |
| 633 _free_list.remove_all_pending(num_regions); | |
| 634 } | |
| 635 } | |
| 636 } | |
| 637 return first; | |
| 638 } | |
| 639 | |
| 2361 | 640 HeapWord* |
| 3766 | 641 G1CollectedHeap::humongous_obj_allocate_initialize_regions(size_t first, |
| 2361 | 642 size_t num_regions, |
| 643 size_t word_size) { | |
| 3766 | 644 assert(first != G1_NULL_HRS_INDEX, "pre-condition"); |
| 2361 | 645 assert(isHumongous(word_size), "word_size should be humongous"); |
| 646 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
| 647 | |
| 648 // Index of last region in the series + 1. | |
| 3766 | 649 size_t last = first + num_regions; |
| 2361 | 650 |
| 651 // We need to initialize the region(s) we just discovered. This is | |
| 652 // a bit tricky given that it can happen concurrently with | |
| 653 // refinement threads refining cards on these regions and | |
| 654 // potentially wanting to refine the BOT as they are scanning | |
| 655 // those cards (this can happen shortly after a cleanup; see CR | |
| 656 // 6991377). So we have to set up the region(s) carefully and in | |
| 657 // a specific order. | |
| 658 | |
| 659 // The word size sum of all the regions we will allocate. | |
| 660 size_t word_size_sum = num_regions * HeapRegion::GrainWords; | |
| 661 assert(word_size <= word_size_sum, "sanity"); | |
| 662 | |
| 663 // This will be the "starts humongous" region. | |
| 3766 | 664 HeapRegion* first_hr = region_at(first); |
| 2361 | 665 // The header of the new object will be placed at the bottom of |
| 666 // the first region. | |
| 667 HeapWord* new_obj = first_hr->bottom(); | |
| 668 // This will be the new end of the first region in the series that | |
| 669 // should also match the end of the last region in the seriers. | |
| 670 HeapWord* new_end = new_obj + word_size_sum; | |
| 671 // This will be the new top of the first region that will reflect | |
| 672 // this allocation. | |
| 673 HeapWord* new_top = new_obj + word_size; | |
| 674 | |
| 675 // First, we need to zero the header of the space that we will be | |
| 676 // allocating. When we update top further down, some refinement | |
| 677 // threads might try to scan the region. By zeroing the header we | |
| 678 // ensure that any thread that will try to scan the region will | |
| 679 // come across the zero klass word and bail out. | |
| 680 // | |
| 681 // NOTE: It would not have been correct to have used | |
| 682 // CollectedHeap::fill_with_object() and make the space look like | |
| 683 // an int array. The thread that is doing the allocation will | |
| 684 // later update the object header to a potentially different array | |
| 685 // type and, for a very short period of time, the klass and length | |
| 686 // fields will be inconsistent. This could cause a refinement | |
| 687 // thread to calculate the object size incorrectly. | |
| 688 Copy::fill_to_words(new_obj, oopDesc::header_size(), 0); | |
| 689 | |
| 690 // We will set up the first region as "starts humongous". This | |
| 691 // will also update the BOT covering all the regions to reflect | |
| 692 // that there is a single object that starts at the bottom of the | |
| 693 // first region. | |
| 694 first_hr->set_startsHumongous(new_top, new_end); | |
| 695 | |
| 696 // Then, if there are any, we will set up the "continues | |
| 697 // humongous" regions. | |
| 698 HeapRegion* hr = NULL; | |
| 3766 | 699 for (size_t i = first + 1; i < last; ++i) { |
| 700 hr = region_at(i); | |
| 2361 | 701 hr->set_continuesHumongous(first_hr); |
| 702 } | |
| 703 // If we have "continues humongous" regions (hr != NULL), then the | |
| 704 // end of the last one should match new_end. | |
| 705 assert(hr == NULL || hr->end() == new_end, "sanity"); | |
| 706 | |
| 707 // Up to this point no concurrent thread would have been able to | |
| 708 // do any scanning on any region in this series. All the top | |
| 709 // fields still point to bottom, so the intersection between | |
| 710 // [bottom,top] and [card_start,card_end] will be empty. Before we | |
| 711 // update the top fields, we'll do a storestore to make sure that | |
| 712 // no thread sees the update to top before the zeroing of the | |
| 713 // object header and the BOT initialization. | |
| 714 OrderAccess::storestore(); | |
| 715 | |
| 716 // Now that the BOT and the object header have been initialized, | |
| 717 // we can update top of the "starts humongous" region. | |
| 718 assert(first_hr->bottom() < new_top && new_top <= first_hr->end(), | |
| 719 "new_top should be in this region"); | |
| 720 first_hr->set_top(new_top); | |
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721 if (_hr_printer.is_active()) { |
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722 HeapWord* bottom = first_hr->bottom(); |
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723 HeapWord* end = first_hr->orig_end(); |
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724 if ((first + 1) == last) { |
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725 // the series has a single humongous region |
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726 _hr_printer.alloc(G1HRPrinter::SingleHumongous, first_hr, new_top); |
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727 } else { |
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728 // the series has more than one humongous regions |
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729 _hr_printer.alloc(G1HRPrinter::StartsHumongous, first_hr, end); |
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730 } |
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731 } |
| 2361 | 732 |
| 733 // Now, we will update the top fields of the "continues humongous" | |
| 734 // regions. The reason we need to do this is that, otherwise, | |
| 735 // these regions would look empty and this will confuse parts of | |
| 736 // G1. For example, the code that looks for a consecutive number | |
| 737 // of empty regions will consider them empty and try to | |
| 738 // re-allocate them. We can extend is_empty() to also include | |
| 739 // !continuesHumongous(), but it is easier to just update the top | |
| 740 // fields here. The way we set top for all regions (i.e., top == | |
| 741 // end for all regions but the last one, top == new_top for the | |
| 742 // last one) is actually used when we will free up the humongous | |
| 743 // region in free_humongous_region(). | |
| 744 hr = NULL; | |
| 3766 | 745 for (size_t i = first + 1; i < last; ++i) { |
| 746 hr = region_at(i); | |
| 2361 | 747 if ((i + 1) == last) { |
| 748 // last continues humongous region | |
| 749 assert(hr->bottom() < new_top && new_top <= hr->end(), | |
| 750 "new_top should fall on this region"); | |
| 751 hr->set_top(new_top); | |
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752 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, new_top); |
| 2361 | 753 } else { |
| 754 // not last one | |
| 755 assert(new_top > hr->end(), "new_top should be above this region"); | |
| 756 hr->set_top(hr->end()); | |
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757 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, hr->end()); |
| 2361 | 758 } |
| 759 } | |
| 760 // If we have continues humongous regions (hr != NULL), then the | |
| 761 // end of the last one should match new_end and its top should | |
| 762 // match new_top. | |
| 763 assert(hr == NULL || | |
| 764 (hr->end() == new_end && hr->top() == new_top), "sanity"); | |
| 765 | |
| 766 assert(first_hr->used() == word_size * HeapWordSize, "invariant"); | |
| 767 _summary_bytes_used += first_hr->used(); | |
| 768 _humongous_set.add(first_hr); | |
| 769 | |
| 770 return new_obj; | |
| 771 } | |
| 772 | |
| 342 | 773 // If could fit into free regions w/o expansion, try. |
| 774 // Otherwise, if can expand, do so. | |
| 775 // Otherwise, if using ex regions might help, try with ex given back. | |
| 1973 | 776 HeapWord* G1CollectedHeap::humongous_obj_allocate(size_t word_size) { |
| 2152 | 777 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
| 778 | |
| 779 verify_region_sets_optional(); | |
| 342 | 780 |
| 781 size_t num_regions = | |
| 1973 | 782 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; |
| 342 | 783 size_t x_size = expansion_regions(); |
| 3766 | 784 size_t fs = _hrs.free_suffix(); |
| 785 size_t first = humongous_obj_allocate_find_first(num_regions, word_size); | |
| 786 if (first == G1_NULL_HRS_INDEX) { | |
| 2152 | 787 // The only thing we can do now is attempt expansion. |
| 342 | 788 if (fs + x_size >= num_regions) { |
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789 // If the number of regions we're trying to allocate for this |
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790 // object is at most the number of regions in the free suffix, |
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791 // then the call to humongous_obj_allocate_find_first() above |
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792 // should have succeeded and we wouldn't be here. |
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793 // |
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794 // We should only be trying to expand when the free suffix is |
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795 // not sufficient for the object _and_ we have some expansion |
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796 // room available. |
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797 assert(num_regions > fs, "earlier allocation should have succeeded"); |
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798 |
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799 ergo_verbose1(ErgoHeapSizing, |
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800 "attempt heap expansion", |
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801 ergo_format_reason("humongous allocation request failed") |
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802 ergo_format_byte("allocation request"), |
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803 word_size * HeapWordSize); |
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804 if (expand((num_regions - fs) * HeapRegion::GrainBytes)) { |
| 3766 | 805 // Even though the heap was expanded, it might not have |
| 806 // reached the desired size. So, we cannot assume that the | |
| 807 // allocation will succeed. | |
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808 first = humongous_obj_allocate_find_first(num_regions, word_size); |
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809 } |
| 2152 | 810 } |
| 811 } | |
| 812 | |
| 2361 | 813 HeapWord* result = NULL; |
| 3766 | 814 if (first != G1_NULL_HRS_INDEX) { |
| 2361 | 815 result = |
| 816 humongous_obj_allocate_initialize_regions(first, num_regions, word_size); | |
| 817 assert(result != NULL, "it should always return a valid result"); | |
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818 |
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819 // A successful humongous object allocation changes the used space |
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820 // information of the old generation so we need to recalculate the |
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821 // sizes and update the jstat counters here. |
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822 g1mm()->update_sizes(); |
| 2152 | 823 } |
| 824 | |
| 825 verify_region_sets_optional(); | |
| 2361 | 826 |
| 827 return result; | |
| 342 | 828 } |
| 829 | |
| 1973 | 830 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
| 831 assert_heap_not_locked_and_not_at_safepoint(); | |
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832 assert(!isHumongous(word_size), "we do not allow humongous TLABs"); |
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833 |
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834 unsigned int dummy_gc_count_before; |
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835 return attempt_allocation(word_size, &dummy_gc_count_before); |
| 342 | 836 } |
| 837 | |
| 838 HeapWord* | |
| 839 G1CollectedHeap::mem_allocate(size_t word_size, | |
| 1973 | 840 bool* gc_overhead_limit_was_exceeded) { |
| 841 assert_heap_not_locked_and_not_at_safepoint(); | |
| 342 | 842 |
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843 // Loop until the allocation is satisified, or unsatisfied after GC. |
| 1973 | 844 for (int try_count = 1; /* we'll return */; try_count += 1) { |
| 845 unsigned int gc_count_before; | |
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846 |
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847 HeapWord* result = NULL; |
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848 if (!isHumongous(word_size)) { |
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849 result = attempt_allocation(word_size, &gc_count_before); |
|
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850 } else { |
|
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851 result = attempt_allocation_humongous(word_size, &gc_count_before); |
|
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|
852 } |
|
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|
853 if (result != NULL) { |
|
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|
854 return result; |
| 342 | 855 } |
| 856 | |
| 857 // Create the garbage collection operation... | |
| 1973 | 858 VM_G1CollectForAllocation op(gc_count_before, word_size); |
| 342 | 859 // ...and get the VM thread to execute it. |
| 860 VMThread::execute(&op); | |
| 1973 | 861 |
| 862 if (op.prologue_succeeded() && op.pause_succeeded()) { | |
| 863 // If the operation was successful we'll return the result even | |
| 864 // if it is NULL. If the allocation attempt failed immediately | |
| 865 // after a Full GC, it's unlikely we'll be able to allocate now. | |
| 866 HeapWord* result = op.result(); | |
| 867 if (result != NULL && !isHumongous(word_size)) { | |
| 868 // Allocations that take place on VM operations do not do any | |
| 869 // card dirtying and we have to do it here. We only have to do | |
| 870 // this for non-humongous allocations, though. | |
| 871 dirty_young_block(result, word_size); | |
| 872 } | |
| 342 | 873 return result; |
| 1973 | 874 } else { |
| 875 assert(op.result() == NULL, | |
| 876 "the result should be NULL if the VM op did not succeed"); | |
| 342 | 877 } |
| 878 | |
| 879 // Give a warning if we seem to be looping forever. | |
| 880 if ((QueuedAllocationWarningCount > 0) && | |
| 881 (try_count % QueuedAllocationWarningCount == 0)) { | |
| 1973 | 882 warning("G1CollectedHeap::mem_allocate retries %d times", try_count); |
| 342 | 883 } |
| 884 } | |
| 1973 | 885 |
| 886 ShouldNotReachHere(); | |
|
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887 return NULL; |
| 342 | 888 } |
| 889 | |
|
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890 HeapWord* G1CollectedHeap::attempt_allocation_slow(size_t word_size, |
|
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891 unsigned int *gc_count_before_ret) { |
|
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892 // Make sure you read the note in attempt_allocation_humongous(). |
|
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|
893 |
|
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|
894 assert_heap_not_locked_and_not_at_safepoint(); |
|
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|
895 assert(!isHumongous(word_size), "attempt_allocation_slow() should not " |
|
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896 "be called for humongous allocation requests"); |
|
abdfc822206f
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|
897 |
|
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|
898 // We should only get here after the first-level allocation attempt |
|
abdfc822206f
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|
899 // (attempt_allocation()) failed to allocate. |
|
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|
900 |
|
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|
901 // We will loop until a) we manage to successfully perform the |
|
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|
902 // allocation or b) we successfully schedule a collection which |
|
abdfc822206f
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903 // fails to perform the allocation. b) is the only case when we'll |
|
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|
904 // return NULL. |
|
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|
905 HeapWord* result = NULL; |
|
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906 for (int try_count = 1; /* we'll return */; try_count += 1) { |
|
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|
907 bool should_try_gc; |
|
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|
908 unsigned int gc_count_before; |
|
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|
909 |
|
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|
910 { |
|
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|
911 MutexLockerEx x(Heap_lock); |
|
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|
912 |
|
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|
913 result = _mutator_alloc_region.attempt_allocation_locked(word_size, |
|
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|
914 false /* bot_updates */); |
|
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|
915 if (result != NULL) { |
|
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|
916 return result; |
|
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|
917 } |
|
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|
918 |
|
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|
919 // If we reach here, attempt_allocation_locked() above failed to |
|
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|
920 // allocate a new region. So the mutator alloc region should be NULL. |
|
abdfc822206f
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|
921 assert(_mutator_alloc_region.get() == NULL, "only way to get here"); |
|
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|
922 |
|
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|
923 if (GC_locker::is_active_and_needs_gc()) { |
|
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|
924 if (g1_policy()->can_expand_young_list()) { |
|
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3886
diff
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|
925 // No need for an ergo verbose message here, |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3886
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|
926 // can_expand_young_list() does this when it returns true. |
|
2433
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|
927 result = _mutator_alloc_region.attempt_allocation_force(word_size, |
|
abdfc822206f
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|
928 false /* bot_updates */); |
|
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|
929 if (result != NULL) { |
|
abdfc822206f
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|
930 return result; |
|
abdfc822206f
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parents:
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|
931 } |
|
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|
932 } |
|
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|
933 should_try_gc = false; |
|
abdfc822206f
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|
934 } else { |
|
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|
935 // Read the GC count while still holding the Heap_lock. |
|
abdfc822206f
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|
936 gc_count_before = SharedHeap::heap()->total_collections(); |
|
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|
937 should_try_gc = true; |
|
abdfc822206f
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|
938 } |
|
abdfc822206f
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|
939 } |
|
abdfc822206f
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|
940 |
|
abdfc822206f
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|
941 if (should_try_gc) { |
|
abdfc822206f
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|
942 bool succeeded; |
|
abdfc822206f
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|
943 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
|
abdfc822206f
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|
944 if (result != NULL) { |
|
abdfc822206f
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parents:
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|
945 assert(succeeded, "only way to get back a non-NULL result"); |
|
abdfc822206f
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parents:
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|
946 return result; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
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|
947 } |
|
abdfc822206f
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diff
changeset
|
948 |
|
abdfc822206f
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diff
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|
949 if (succeeded) { |
|
abdfc822206f
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|
950 // If we get here we successfully scheduled a collection which |
|
abdfc822206f
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|
951 // failed to allocate. No point in trying to allocate |
|
abdfc822206f
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|
952 // further. We'll just return NULL. |
|
abdfc822206f
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|
953 MutexLockerEx x(Heap_lock); |
|
abdfc822206f
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|
954 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
|
abdfc822206f
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|
955 return NULL; |
|
abdfc822206f
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tonyp
parents:
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diff
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|
956 } |
|
abdfc822206f
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|
957 } else { |
|
abdfc822206f
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|
958 GC_locker::stall_until_clear(); |
|
abdfc822206f
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|
959 } |
|
abdfc822206f
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parents:
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diff
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|
960 |
|
abdfc822206f
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parents:
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diff
changeset
|
961 // We can reach here if we were unsuccessul in scheduling a |
|
abdfc822206f
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|
962 // collection (because another thread beat us to it) or if we were |
|
abdfc822206f
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|
963 // stalled due to the GC locker. In either can we should retry the |
|
abdfc822206f
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diff
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|
964 // allocation attempt in case another thread successfully |
|
abdfc822206f
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diff
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|
965 // performed a collection and reclaimed enough space. We do the |
|
abdfc822206f
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diff
changeset
|
966 // first attempt (without holding the Heap_lock) here and the |
|
abdfc822206f
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parents:
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diff
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|
967 // follow-on attempt will be at the start of the next loop |
|
abdfc822206f
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|
968 // iteration (after taking the Heap_lock). |
|
abdfc822206f
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|
969 result = _mutator_alloc_region.attempt_allocation(word_size, |
|
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diff
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|
970 false /* bot_updates */); |
|
abdfc822206f
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diff
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|
971 if (result != NULL ){ |
|
abdfc822206f
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parents:
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diff
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|
972 return result; |
|
abdfc822206f
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diff
changeset
|
973 } |
|
abdfc822206f
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diff
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|
974 |
|
abdfc822206f
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diff
changeset
|
975 // Give a warning if we seem to be looping forever. |
|
abdfc822206f
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changeset
|
976 if ((QueuedAllocationWarningCount > 0) && |
|
abdfc822206f
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|
977 (try_count % QueuedAllocationWarningCount == 0)) { |
|
abdfc822206f
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|
978 warning("G1CollectedHeap::attempt_allocation_slow() " |
|
abdfc822206f
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|
979 "retries %d times", try_count); |
|
abdfc822206f
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|
980 } |
|
abdfc822206f
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2432
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|
981 } |
|
abdfc822206f
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parents:
2432
diff
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|
982 |
|
abdfc822206f
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tonyp
parents:
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diff
changeset
|
983 ShouldNotReachHere(); |
|
abdfc822206f
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tonyp
parents:
2432
diff
changeset
|
984 return NULL; |
|
abdfc822206f
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tonyp
parents:
2432
diff
changeset
|
985 } |
|
abdfc822206f
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2432
diff
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|
986 |
|
abdfc822206f
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2432
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|
987 HeapWord* G1CollectedHeap::attempt_allocation_humongous(size_t word_size, |
|
abdfc822206f
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|
988 unsigned int * gc_count_before_ret) { |
|
abdfc822206f
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2432
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|
989 // The structure of this method has a lot of similarities to |
|
abdfc822206f
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2432
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|
990 // attempt_allocation_slow(). The reason these two were not merged |
|
abdfc822206f
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2432
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|
991 // into a single one is that such a method would require several "if |
|
abdfc822206f
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2432
diff
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|
992 // allocation is not humongous do this, otherwise do that" |
|
abdfc822206f
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2432
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|
993 // conditional paths which would obscure its flow. In fact, an early |
|
abdfc822206f
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|
994 // version of this code did use a unified method which was harder to |
|
abdfc822206f
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tonyp
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diff
changeset
|
995 // follow and, as a result, it had subtle bugs that were hard to |
|
abdfc822206f
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2432
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changeset
|
996 // track down. So keeping these two methods separate allows each to |
|
abdfc822206f
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2432
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|
997 // be more readable. It will be good to keep these two in sync as |
|
abdfc822206f
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|
998 // much as possible. |
|
abdfc822206f
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999 |
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1000 assert_heap_not_locked_and_not_at_safepoint(); |
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1001 assert(isHumongous(word_size), "attempt_allocation_humongous() " |
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1002 "should only be called for humongous allocations"); |
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1003 |
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1004 // We will loop until a) we manage to successfully perform the |
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1005 // allocation or b) we successfully schedule a collection which |
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1006 // fails to perform the allocation. b) is the only case when we'll |
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1007 // return NULL. |
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1008 HeapWord* result = NULL; |
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1009 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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1010 bool should_try_gc; |
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1011 unsigned int gc_count_before; |
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1012 |
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1013 { |
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1014 MutexLockerEx x(Heap_lock); |
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1015 |
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1016 // Given that humongous objects are not allocated in young |
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1017 // regions, we'll first try to do the allocation without doing a |
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1018 // collection hoping that there's enough space in the heap. |
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1019 result = humongous_obj_allocate(word_size); |
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1020 if (result != NULL) { |
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1021 return result; |
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1022 } |
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1023 |
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1024 if (GC_locker::is_active_and_needs_gc()) { |
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1025 should_try_gc = false; |
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1026 } else { |
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1027 // Read the GC count while still holding the Heap_lock. |
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1028 gc_count_before = SharedHeap::heap()->total_collections(); |
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1029 should_try_gc = true; |
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1030 } |
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1031 } |
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1032 |
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1033 if (should_try_gc) { |
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1034 // If we failed to allocate the humongous object, we should try to |
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1035 // do a collection pause (if we're allowed) in case it reclaims |
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1036 // enough space for the allocation to succeed after the pause. |
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1037 |
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1038 bool succeeded; |
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1039 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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1040 if (result != NULL) { |
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1041 assert(succeeded, "only way to get back a non-NULL result"); |
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1042 return result; |
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1043 } |
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1044 |
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1045 if (succeeded) { |
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1046 // If we get here we successfully scheduled a collection which |
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1047 // failed to allocate. No point in trying to allocate |
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1048 // further. We'll just return NULL. |
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1049 MutexLockerEx x(Heap_lock); |
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1050 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
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1051 return NULL; |
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1052 } |
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1053 } else { |
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1054 GC_locker::stall_until_clear(); |
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1055 } |
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1056 |
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1057 // We can reach here if we were unsuccessul in scheduling a |
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1058 // collection (because another thread beat us to it) or if we were |
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1059 // stalled due to the GC locker. In either can we should retry the |
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1060 // allocation attempt in case another thread successfully |
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1061 // performed a collection and reclaimed enough space. Give a |
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1062 // warning if we seem to be looping forever. |
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1063 |
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1064 if ((QueuedAllocationWarningCount > 0) && |
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1065 (try_count % QueuedAllocationWarningCount == 0)) { |
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1066 warning("G1CollectedHeap::attempt_allocation_humongous() " |
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1067 "retries %d times", try_count); |
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1068 } |
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1069 } |
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1070 |
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1071 ShouldNotReachHere(); |
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1072 return NULL; |
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1073 } |
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1074 |
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1075 HeapWord* G1CollectedHeap::attempt_allocation_at_safepoint(size_t word_size, |
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1076 bool expect_null_mutator_alloc_region) { |
| 2152 | 1077 assert_at_safepoint(true /* should_be_vm_thread */); |
|
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1078 assert(_mutator_alloc_region.get() == NULL || |
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1079 !expect_null_mutator_alloc_region, |
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1080 "the current alloc region was unexpectedly found to be non-NULL"); |
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1081 |
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1082 if (!isHumongous(word_size)) { |
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1083 return _mutator_alloc_region.attempt_allocation_locked(word_size, |
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1084 false /* bot_updates */); |
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1085 } else { |
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1086 return humongous_obj_allocate(word_size); |
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1087 } |
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1088 |
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1089 ShouldNotReachHere(); |
| 342 | 1090 } |
| 1091 | |
| 1092 class PostMCRemSetClearClosure: public HeapRegionClosure { | |
| 1093 ModRefBarrierSet* _mr_bs; | |
| 1094 public: | |
| 1095 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 1096 bool doHeapRegion(HeapRegion* r) { | |
| 1097 r->reset_gc_time_stamp(); | |
| 1098 if (r->continuesHumongous()) | |
| 1099 return false; | |
| 1100 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 1101 if (hrrs != NULL) hrrs->clear(); | |
| 1102 // You might think here that we could clear just the cards | |
| 1103 // corresponding to the used region. But no: if we leave a dirty card | |
| 1104 // in a region we might allocate into, then it would prevent that card | |
| 1105 // from being enqueued, and cause it to be missed. | |
| 1106 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
| 1107 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
| 1108 return false; | |
| 1109 } | |
| 1110 }; | |
| 1111 | |
| 1112 | |
| 1113 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
| 1114 ModRefBarrierSet* _mr_bs; | |
| 1115 public: | |
| 1116 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 1117 bool doHeapRegion(HeapRegion* r) { | |
| 1118 if (r->continuesHumongous()) return false; | |
| 1119 if (r->used_region().word_size() != 0) { | |
| 1120 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
| 1121 } | |
| 1122 return false; | |
| 1123 } | |
| 1124 }; | |
| 1125 | |
|
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1126 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
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1127 G1CollectedHeap* _g1h; |
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1128 UpdateRSOopClosure _cl; |
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1129 int _worker_i; |
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1130 public: |
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1131 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
| 1861 | 1132 _cl(g1->g1_rem_set(), worker_i), |
|
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1133 _worker_i(worker_i), |
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1134 _g1h(g1) |
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1135 { } |
|
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1136 |
|
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1137 bool doHeapRegion(HeapRegion* r) { |
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1138 if (!r->continuesHumongous()) { |
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1139 _cl.set_from(r); |
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1140 r->oop_iterate(&_cl); |
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1141 } |
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1142 return false; |
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1143 } |
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1144 }; |
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1145 |
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1146 class ParRebuildRSTask: public AbstractGangTask { |
|
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1147 G1CollectedHeap* _g1; |
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1148 public: |
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1149 ParRebuildRSTask(G1CollectedHeap* g1) |
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1150 : AbstractGangTask("ParRebuildRSTask"), |
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1151 _g1(g1) |
|
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apetrusenko
parents:
620
diff
changeset
|
1152 { } |
|
87fa6e083d82
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apetrusenko
parents:
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diff
changeset
|
1153 |
|
87fa6e083d82
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apetrusenko
parents:
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diff
changeset
|
1154 void work(int i) { |
|
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diff
changeset
|
1155 RebuildRSOutOfRegionClosure rebuild_rs(_g1, i); |
|
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parents:
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diff
changeset
|
1156 _g1->heap_region_par_iterate_chunked(&rebuild_rs, i, |
|
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6760309: G1: update remembered sets during Full GCs
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changeset
|
1157 HeapRegion::RebuildRSClaimValue); |
|
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6760309: G1: update remembered sets during Full GCs
apetrusenko
parents:
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diff
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|
1158 } |
|
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parents:
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diff
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|
1159 }; |
|
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|
1160 |
|
3778
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|
1161 class PostCompactionPrinterClosure: public HeapRegionClosure { |
|
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1162 private: |
|
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|
1163 G1HRPrinter* _hr_printer; |
|
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|
1164 public: |
|
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|
1165 bool doHeapRegion(HeapRegion* hr) { |
|
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1166 assert(!hr->is_young(), "not expecting to find young regions"); |
|
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|
1167 // We only generate output for non-empty regions. |
|
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1168 if (!hr->is_empty()) { |
|
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1169 if (!hr->isHumongous()) { |
|
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|
1170 _hr_printer->post_compaction(hr, G1HRPrinter::Old); |
|
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|
1171 } else if (hr->startsHumongous()) { |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
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|
1172 if (hr->capacity() == HeapRegion::GrainBytes) { |
|
3778
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1173 // single humongous region |
|
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|
1174 _hr_printer->post_compaction(hr, G1HRPrinter::SingleHumongous); |
|
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1175 } else { |
|
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|
1176 _hr_printer->post_compaction(hr, G1HRPrinter::StartsHumongous); |
|
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1177 } |
|
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|
1178 } else { |
|
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|
1179 assert(hr->continuesHumongous(), "only way to get here"); |
|
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|
1180 _hr_printer->post_compaction(hr, G1HRPrinter::ContinuesHumongous); |
|
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|
1181 } |
|
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|
1182 } |
|
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|
1183 return false; |
|
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|
1184 } |
|
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|
1185 |
|
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|
1186 PostCompactionPrinterClosure(G1HRPrinter* hr_printer) |
|
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|
1187 : _hr_printer(hr_printer) { } |
|
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|
1188 }; |
|
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|
1189 |
| 1973 | 1190 bool G1CollectedHeap::do_collection(bool explicit_gc, |
|
1656
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6944166: G1: explicit GCs are not always handled correctly
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|
1191 bool clear_all_soft_refs, |
| 342 | 1192 size_t word_size) { |
| 2152 | 1193 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1194 | |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
1195 if (GC_locker::check_active_before_gc()) { |
| 1973 | 1196 return false; |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
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|
1197 } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
1198 |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2039
diff
changeset
|
1199 SvcGCMarker sgcm(SvcGCMarker::FULL); |
| 342 | 1200 ResourceMark rm; |
| 1201 | |
|
838
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|
1202 if (PrintHeapAtGC) { |
|
0316eac49d5a
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|
1203 Universe::print_heap_before_gc(); |
|
0316eac49d5a
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|
1204 } |
|
0316eac49d5a
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|
1205 |
| 4072 | 1206 HRSPhaseSetter x(HRSPhaseFullGC); |
| 2152 | 1207 verify_region_sets_optional(); |
| 342 | 1208 |
|
1387
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diff
changeset
|
1209 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
|
0bfd3fb24150
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changeset
|
1210 collector_policy()->should_clear_all_soft_refs(); |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
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|
1211 |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
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changeset
|
1212 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
|
0bfd3fb24150
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|
1213 |
| 342 | 1214 { |
| 1215 IsGCActiveMark x; | |
| 1216 | |
| 1217 // Timing | |
|
1656
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diff
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|
1218 bool system_gc = (gc_cause() == GCCause::_java_lang_system_gc); |
|
4e5661ba9d98
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diff
changeset
|
1219 assert(!system_gc || explicit_gc, "invariant"); |
| 342 | 1220 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
| 1221 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
|
1656
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6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
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|
1222 TraceTime t(system_gc ? "Full GC (System.gc())" : "Full GC", |
|
1387
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diff
changeset
|
1223 PrintGC, true, gclog_or_tty); |
| 342 | 1224 |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
1225 TraceCollectorStats tcs(g1mm()->full_collection_counters()); |
|
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
1226 TraceMemoryManagerStats tms(true /* fullGC */, gc_cause()); |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
1227 |
| 342 | 1228 double start = os::elapsedTime(); |
| 1229 g1_policy()->record_full_collection_start(); | |
| 1230 | |
| 2152 | 1231 wait_while_free_regions_coming(); |
| 2361 | 1232 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 1233 |
| 342 | 1234 gc_prologue(true); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
1235 increment_total_collections(true /* full gc */); |
| 342 | 1236 |
| 1237 size_t g1h_prev_used = used(); | |
| 1238 assert(used() == recalculate_used(), "Should be equal"); | |
| 1239 | |
| 1240 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
| 1241 HandleMark hm; // Discard invalid handles created during verification | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
1242 gclog_or_tty->print(" VerifyBeforeGC:"); |
| 342 | 1243 prepare_for_verify(); |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
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3766
diff
changeset
|
1244 Universe::verify(/* allow dirty */ true, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
1245 /* silent */ false, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
1246 /* option */ VerifyOption_G1UsePrevMarking); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3766
diff
changeset
|
1247 |
| 342 | 1248 } |
|
3869
7f776886a215
6810861: G1: support -XX:+{PrintClassHistogram,HeapDump}{Before,After}FullGC
ysr
parents:
3867
diff
changeset
|
1249 pre_full_gc_dump(); |
| 342 | 1250 |
| 1251 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 1252 | |
|
3979
4dfb2df418f2
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diff
changeset
|
1253 // Disable discovery and empty the discovered lists |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
1254 // for the CM ref processor. |
|
4dfb2df418f2
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diff
changeset
|
1255 ref_processor_cm()->disable_discovery(); |
|
4dfb2df418f2
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diff
changeset
|
1256 ref_processor_cm()->abandon_partial_discovery(); |
|
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diff
changeset
|
1257 ref_processor_cm()->verify_no_references_recorded(); |
| 342 | 1258 |
| 1259 // Abandon current iterations of concurrent marking and concurrent | |
| 1260 // refinement, if any are in progress. | |
| 1261 concurrent_mark()->abort(); | |
| 1262 | |
| 1263 // Make sure we'll choose a new allocation region afterwards. | |
|
2433
abdfc822206f
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tonyp
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diff
changeset
|
1264 release_mutator_alloc_region(); |
| 636 | 1265 abandon_gc_alloc_regions(); |
| 1861 | 1266 g1_rem_set()->cleanupHRRS(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1267 |
|
3778
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|
1268 // We should call this after we retire any currently active alloc |
|
5f6f2615433a
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changeset
|
1269 // regions so that all the ALLOC / RETIRE events are generated |
|
5f6f2615433a
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|
1270 // before the start GC event. |
|
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changeset
|
1271 _hr_printer.start_gc(true /* full */, (size_t) total_collections()); |
|
5f6f2615433a
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|
1272 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
1273 // We may have added regions to the current incremental collection |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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1391
diff
changeset
|
1274 // set between the last GC or pause and now. We need to clear the |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
1275 // incremental collection set and then start rebuilding it afresh |
|
1316cec51b4d
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diff
changeset
|
1276 // after this full GC. |
|
1316cec51b4d
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johnc
parents:
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diff
changeset
|
1277 abandon_collection_set(g1_policy()->inc_cset_head()); |
|
1316cec51b4d
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johnc
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1391
diff
changeset
|
1278 g1_policy()->clear_incremental_cset(); |
|
1316cec51b4d
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johnc
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1391
diff
changeset
|
1279 g1_policy()->stop_incremental_cset_building(); |
|
1316cec51b4d
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diff
changeset
|
1280 |
| 4072 | 1281 tear_down_region_sets(false /* free_list_only */); |
|
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
1282 g1_policy()->set_full_young_gcs(true); |
| 342 | 1283 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
1284 // See the comments in g1CollectedHeap.hpp and |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
1285 // G1CollectedHeap::ref_processing_init() about |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
1286 // how reference processing currently works in G1. |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
1287 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
1288 // Temporarily make discovery by the STW ref processor single threaded (non-MT). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
1289 ReferenceProcessorMTDiscoveryMutator stw_rp_disc_ser(ref_processor_stw(), false); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
1290 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1291 // Temporarily clear the STW ref processor's _is_alive_non_header field. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
1292 ReferenceProcessorIsAliveMutator stw_rp_is_alive_null(ref_processor_stw(), NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
1293 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1294 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
1295 ref_processor_stw()->setup_policy(do_clear_all_soft_refs); |
|
4dfb2df418f2
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diff
changeset
|
1296 |
| 342 | 1297 // Do collection work |
| 1298 { | |
| 1299 HandleMark hm; // Discard invalid handles created during gc | |
|
3979
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6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
1300 G1MarkSweep::invoke_at_safepoint(ref_processor_stw(), do_clear_all_soft_refs); |
| 342 | 1301 } |
|
3979
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diff
changeset
|
1302 |
| 2152 | 1303 assert(free_regions() == 0, "we should not have added any free regions"); |
| 4072 | 1304 rebuild_region_sets(false /* free_list_only */); |
| 342 | 1305 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
1306 // Enqueue any discovered reference objects that have |
|
4dfb2df418f2
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1307 // not been removed from the discovered lists. |
|
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|
1308 ref_processor_stw()->enqueue_discovered_references(); |
| 342 | 1309 |
| 1310 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 1311 | |
|
1089
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|
1312 MemoryService::track_memory_usage(); |
|
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1313 |
| 342 | 1314 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
| 1315 HandleMark hm; // Discard invalid handles created during verification | |
| 1316 gclog_or_tty->print(" VerifyAfterGC:"); | |
|
637
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|
1317 prepare_for_verify(); |
|
3772
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|
1318 Universe::verify(/* allow dirty */ false, |
|
6747fd0512e0
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|
1319 /* silent */ false, |
|
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|
1320 /* option */ VerifyOption_G1UsePrevMarking); |
|
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1321 |
| 342 | 1322 } |
|
3979
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|
1323 |
|
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|
1324 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
|
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1325 ref_processor_stw()->verify_no_references_recorded(); |
|
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|
1326 |
|
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|
1327 // Note: since we've just done a full GC, concurrent |
|
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1328 // marking is no longer active. Therefore we need not |
|
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|
1329 // re-enable reference discovery for the CM ref processor. |
|
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1330 // That will be done at the start of the next marking cycle. |
|
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|
1331 assert(!ref_processor_cm()->discovery_enabled(), "Postcondition"); |
|
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|
1332 ref_processor_cm()->verify_no_references_recorded(); |
| 342 | 1333 |
| 1334 reset_gc_time_stamp(); | |
| 1335 // Since everything potentially moved, we will clear all remembered | |
|
626
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1336 // sets, and clear all cards. Later we will rebuild remebered |
|
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1337 // sets. We will also reset the GC time stamps of the regions. |
| 342 | 1338 PostMCRemSetClearClosure rs_clear(mr_bs()); |
| 1339 heap_region_iterate(&rs_clear); | |
| 1340 | |
| 1341 // Resize the heap if necessary. | |
|
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1342 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
| 342 | 1343 |
|
3778
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|
1344 if (_hr_printer.is_active()) { |
|
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1345 // We should do this after we potentially resize the heap so |
|
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1346 // that all the COMMIT / UNCOMMIT events are generated before |
|
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1347 // the end GC event. |
|
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|
1348 |
|
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|
1349 PostCompactionPrinterClosure cl(hr_printer()); |
|
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|
1350 heap_region_iterate(&cl); |
|
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1351 |
|
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|
1352 _hr_printer.end_gc(true /* full */, (size_t) total_collections()); |
|
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1353 } |
|
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|
1354 |
| 342 | 1355 if (_cg1r->use_cache()) { |
| 1356 _cg1r->clear_and_record_card_counts(); | |
| 1357 _cg1r->clear_hot_cache(); | |
| 1358 } | |
| 1359 | |
|
626
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1360 // Rebuild remembered sets of all regions. |
|
1833
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|
1361 |
|
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|
1362 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
626
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1363 ParRebuildRSTask rebuild_rs_task(this); |
|
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1364 assert(check_heap_region_claim_values( |
|
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|
1365 HeapRegion::InitialClaimValue), "sanity check"); |
|
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|
1366 set_par_threads(workers()->total_workers()); |
|
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|
1367 workers()->run_task(&rebuild_rs_task); |
|
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|
1368 set_par_threads(0); |
|
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|
1369 assert(check_heap_region_claim_values( |
|
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|
1370 HeapRegion::RebuildRSClaimValue), "sanity check"); |
|
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|
1371 reset_heap_region_claim_values(); |
|
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|
1372 } else { |
|
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|
1373 RebuildRSOutOfRegionClosure rebuild_rs(this); |
|
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|
1374 heap_region_iterate(&rebuild_rs); |
|
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|
1375 } |
|
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|
1376 |
| 342 | 1377 if (PrintGC) { |
| 1378 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
| 1379 } | |
| 1380 | |
| 1381 if (true) { // FIXME | |
| 1382 // Ask the permanent generation to adjust size for full collections | |
| 1383 perm()->compute_new_size(); | |
| 1384 } | |
| 1385 | |
|
1394
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|
1386 // Start a new incremental collection set for the next pause |
|
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|
1387 assert(g1_policy()->collection_set() == NULL, "must be"); |
|
1316cec51b4d
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|
1388 g1_policy()->start_incremental_cset_building(); |
|
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|
1389 |
|
1316cec51b4d
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|
1390 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
1316cec51b4d
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|
1391 // regions to the incremental collection set for the next |
|
1316cec51b4d
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|
1392 // evacuation pause. |
|
1316cec51b4d
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|
1393 clear_cset_fast_test(); |
|
1316cec51b4d
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|
1394 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
1395 init_mutator_alloc_region(); |
|
abdfc822206f
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diff
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|
1396 |
| 342 | 1397 double end = os::elapsedTime(); |
| 1398 g1_policy()->record_full_collection_end(); | |
| 1399 | |
|
546
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6690928: Use spinning in combination with yields for workstealing termination.
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|
1400 #ifdef TRACESPINNING |
|
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6690928: Use spinning in combination with yields for workstealing termination.
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|
1401 ParallelTaskTerminator::print_termination_counts(); |
|
05c6d52fa7a9
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diff
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|
1402 #endif |
|
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|
1403 |
| 342 | 1404 gc_epilogue(true); |
| 1405 | |
| 794 | 1406 // Discard all rset updates |
| 1407 JavaThread::dirty_card_queue_set().abandon_logs(); | |
|
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
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|
1408 assert(!G1DeferredRSUpdate |
|
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6720309: G1: don't synchronously update RSet during evacuation pauses
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|
1409 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
| 342 | 1410 } |
| 1411 | |
|
3867
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|
1412 _young_list->reset_sampled_info(); |
|
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1413 // At this point there should be no regions in the |
|
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|
1414 // entire heap tagged as young. |
|
ff53346271fe
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|
1415 assert( check_young_list_empty(true /* check_heap */), |
|
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diff
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|
1416 "young list should be empty at this point"); |
|
838
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|
1417 |
|
1656
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|
1418 // Update the number of full collections that have been completed. |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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diff
changeset
|
1419 increment_full_collections_completed(false /* concurrent */); |
|
1656
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|
1420 |
| 3766 | 1421 _hrs.verify_optional(); |
| 2152 | 1422 verify_region_sets_optional(); |
| 1423 | |
|
838
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|
1424 if (PrintHeapAtGC) { |
|
0316eac49d5a
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|
1425 Universe::print_heap_after_gc(); |
|
0316eac49d5a
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|
1426 } |
|
3980
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|
1427 g1mm()->update_sizes(); |
|
3869
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|
1428 post_full_gc_dump(); |
| 1973 | 1429 |
| 1430 return true; | |
| 342 | 1431 } |
| 1432 | |
| 1433 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
| 1973 | 1434 // do_collection() will return whether it succeeded in performing |
| 1435 // the GC. Currently, there is no facility on the | |
| 1436 // do_full_collection() API to notify the caller than the collection | |
| 1437 // did not succeed (e.g., because it was locked out by the GC | |
| 1438 // locker). So, right now, we'll ignore the return value. | |
| 1439 bool dummy = do_collection(true, /* explicit_gc */ | |
| 1440 clear_all_soft_refs, | |
| 1441 0 /* word_size */); | |
| 342 | 1442 } |
| 1443 | |
| 1444 // This code is mostly copied from TenuredGeneration. | |
| 1445 void | |
| 1446 G1CollectedHeap:: | |
| 1447 resize_if_necessary_after_full_collection(size_t word_size) { | |
| 1448 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
| 1449 | |
| 1450 // Include the current allocation, if any, and bytes that will be | |
| 1451 // pre-allocated to support collections, as "used". | |
| 1452 const size_t used_after_gc = used(); | |
| 1453 const size_t capacity_after_gc = capacity(); | |
| 1454 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
| 1455 | |
|
1717
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|
1456 // This is enforced in arguments.cpp. |
|
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|
1457 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
|
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|
1458 "otherwise the code below doesn't make sense"); |
|
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|
1459 |
| 342 | 1460 // We don't have floating point command-line arguments |
|
1717
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|
1461 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
| 342 | 1462 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
|
1717
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|
1463 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
| 342 | 1464 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
| 1465 | |
|
1717
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|
1466 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
|
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|
1467 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
|
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|
1468 |
|
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|
1469 // We have to be careful here as these two calculations can overflow |
|
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|
1470 // 32-bit size_t's. |
|
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|
1471 double used_after_gc_d = (double) used_after_gc; |
|
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|
1472 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
|
688c3755d7af
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|
1473 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
|
688c3755d7af
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|
1474 |
|
688c3755d7af
6959014: G1: assert(minimum_desired_capacity <= maximum_desired_capacity) failed: sanity check
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|
1475 // Let's make sure that they are both under the max heap size, which |
|
688c3755d7af
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|
1476 // by default will make them fit into a size_t. |
|
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1477 double desired_capacity_upper_bound = (double) max_heap_size; |
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1478 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
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1479 desired_capacity_upper_bound); |
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1480 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
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1481 desired_capacity_upper_bound); |
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1482 |
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1483 // We can now safely turn them into size_t's. |
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1484 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
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1485 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
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1486 |
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1487 // This assert only makes sense here, before we adjust them |
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1488 // with respect to the min and max heap size. |
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1489 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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1490 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
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1491 "maximum_desired_capacity = "SIZE_FORMAT, |
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1492 minimum_desired_capacity, maximum_desired_capacity)); |
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1493 |
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1494 // Should not be greater than the heap max size. No need to adjust |
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1495 // it with respect to the heap min size as it's a lower bound (i.e., |
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1496 // we'll try to make the capacity larger than it, not smaller). |
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1497 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
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1498 // Should not be less than the heap min size. No need to adjust it |
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1499 // with respect to the heap max size as it's an upper bound (i.e., |
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1500 // we'll try to make the capacity smaller than it, not greater). |
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1501 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
| 342 | 1502 |
|
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1503 if (capacity_after_gc < minimum_desired_capacity) { |
| 342 | 1504 // Don't expand unless it's significant |
| 1505 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
|
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1506 ergo_verbose4(ErgoHeapSizing, |
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1507 "attempt heap expansion", |
|
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1508 ergo_format_reason("capacity lower than " |
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1509 "min desired capacity after Full GC") |
|
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1510 ergo_format_byte("capacity") |
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1511 ergo_format_byte("occupancy") |
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1512 ergo_format_byte_perc("min desired capacity"), |
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1513 capacity_after_gc, used_after_gc, |
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1514 minimum_desired_capacity, (double) MinHeapFreeRatio); |
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1515 expand(expand_bytes); |
| 342 | 1516 |
| 1517 // No expansion, now see if we want to shrink | |
|
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1518 } else if (capacity_after_gc > maximum_desired_capacity) { |
| 342 | 1519 // Capacity too large, compute shrinking size |
| 1520 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
|
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1521 ergo_verbose4(ErgoHeapSizing, |
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1522 "attempt heap shrinking", |
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1523 ergo_format_reason("capacity higher than " |
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1524 "max desired capacity after Full GC") |
|
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1525 ergo_format_byte("capacity") |
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1526 ergo_format_byte("occupancy") |
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1527 ergo_format_byte_perc("max desired capacity"), |
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1528 capacity_after_gc, used_after_gc, |
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1529 maximum_desired_capacity, (double) MaxHeapFreeRatio); |
| 342 | 1530 shrink(shrink_bytes); |
| 1531 } | |
| 1532 } | |
| 1533 | |
| 1534 | |
| 1535 HeapWord* | |
| 1973 | 1536 G1CollectedHeap::satisfy_failed_allocation(size_t word_size, |
| 1537 bool* succeeded) { | |
| 2152 | 1538 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1973 | 1539 |
| 1540 *succeeded = true; | |
| 1541 // Let's attempt the allocation first. | |
|
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1542 HeapWord* result = |
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1543 attempt_allocation_at_safepoint(word_size, |
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1544 false /* expect_null_mutator_alloc_region */); |
| 1973 | 1545 if (result != NULL) { |
| 1546 assert(*succeeded, "sanity"); | |
| 1547 return result; | |
| 1548 } | |
| 342 | 1549 |
| 1550 // In a G1 heap, we're supposed to keep allocation from failing by | |
| 1551 // incremental pauses. Therefore, at least for now, we'll favor | |
| 1552 // expansion over collection. (This might change in the future if we can | |
| 1553 // do something smarter than full collection to satisfy a failed alloc.) | |
| 1554 result = expand_and_allocate(word_size); | |
| 1555 if (result != NULL) { | |
| 1973 | 1556 assert(*succeeded, "sanity"); |
| 342 | 1557 return result; |
| 1558 } | |
| 1559 | |
| 1973 | 1560 // Expansion didn't work, we'll try to do a Full GC. |
| 1561 bool gc_succeeded = do_collection(false, /* explicit_gc */ | |
| 1562 false, /* clear_all_soft_refs */ | |
| 1563 word_size); | |
| 1564 if (!gc_succeeded) { | |
| 1565 *succeeded = false; | |
| 1566 return NULL; | |
| 1567 } | |
| 1568 | |
| 1569 // Retry the allocation | |
| 1570 result = attempt_allocation_at_safepoint(word_size, | |
|
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1571 true /* expect_null_mutator_alloc_region */); |
| 342 | 1572 if (result != NULL) { |
| 1973 | 1573 assert(*succeeded, "sanity"); |
| 342 | 1574 return result; |
| 1575 } | |
| 1576 | |
| 1973 | 1577 // Then, try a Full GC that will collect all soft references. |
| 1578 gc_succeeded = do_collection(false, /* explicit_gc */ | |
| 1579 true, /* clear_all_soft_refs */ | |
| 1580 word_size); | |
| 1581 if (!gc_succeeded) { | |
| 1582 *succeeded = false; | |
| 1583 return NULL; | |
| 1584 } | |
| 1585 | |
| 1586 // Retry the allocation once more | |
| 1587 result = attempt_allocation_at_safepoint(word_size, | |
|
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1588 true /* expect_null_mutator_alloc_region */); |
| 342 | 1589 if (result != NULL) { |
| 1973 | 1590 assert(*succeeded, "sanity"); |
| 342 | 1591 return result; |
| 1592 } | |
| 1593 | |
|
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1594 assert(!collector_policy()->should_clear_all_soft_refs(), |
| 1973 | 1595 "Flag should have been handled and cleared prior to this point"); |
|
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1596 |
| 342 | 1597 // What else? We might try synchronous finalization later. If the total |
| 1598 // space available is large enough for the allocation, then a more | |
| 1599 // complete compaction phase than we've tried so far might be | |
| 1600 // appropriate. | |
| 1973 | 1601 assert(*succeeded, "sanity"); |
| 342 | 1602 return NULL; |
| 1603 } | |
| 1604 | |
| 1605 // Attempting to expand the heap sufficiently | |
| 1606 // to support an allocation of the given "word_size". If | |
| 1607 // successful, perform the allocation and return the address of the | |
| 1608 // allocated block, or else "NULL". | |
| 1609 | |
| 1610 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
| 2152 | 1611 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1612 | |
| 1613 verify_region_sets_optional(); | |
| 1973 | 1614 |
|
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1615 size_t expand_bytes = MAX2(word_size * HeapWordSize, MinHeapDeltaBytes); |
|
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1616 ergo_verbose1(ErgoHeapSizing, |
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1617 "attempt heap expansion", |
|
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1618 ergo_format_reason("allocation request failed") |
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1619 ergo_format_byte("allocation request"), |
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1620 word_size * HeapWordSize); |
|
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1621 if (expand(expand_bytes)) { |
| 3766 | 1622 _hrs.verify_optional(); |
|
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1623 verify_region_sets_optional(); |
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1624 return attempt_allocation_at_safepoint(word_size, |
|
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1625 false /* expect_null_mutator_alloc_region */); |
|
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1626 } |
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1627 return NULL; |
| 342 | 1628 } |
| 1629 | |
| 3766 | 1630 void G1CollectedHeap::update_committed_space(HeapWord* old_end, |
| 1631 HeapWord* new_end) { | |
| 1632 assert(old_end != new_end, "don't call this otherwise"); | |
| 1633 assert((HeapWord*) _g1_storage.high() == new_end, "invariant"); | |
| 1634 | |
| 1635 // Update the committed mem region. | |
| 1636 _g1_committed.set_end(new_end); | |
| 1637 // Tell the card table about the update. | |
| 1638 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
| 1639 // Tell the BOT about the update. | |
| 1640 _bot_shared->resize(_g1_committed.word_size()); | |
| 1641 } | |
| 1642 | |
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1643 bool G1CollectedHeap::expand(size_t expand_bytes) { |
| 342 | 1644 size_t old_mem_size = _g1_storage.committed_size(); |
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1645 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
| 342 | 1646 aligned_expand_bytes = align_size_up(aligned_expand_bytes, |
| 1647 HeapRegion::GrainBytes); | |
|
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1648 ergo_verbose2(ErgoHeapSizing, |
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1649 "expand the heap", |
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1650 ergo_format_byte("requested expansion amount") |
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1651 ergo_format_byte("attempted expansion amount"), |
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1652 expand_bytes, aligned_expand_bytes); |
|
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1653 |
| 3766 | 1654 // First commit the memory. |
| 1655 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
|
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1656 bool successful = _g1_storage.expand_by(aligned_expand_bytes); |
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1657 if (successful) { |
| 3766 | 1658 // Then propagate this update to the necessary data structures. |
| 1659 HeapWord* new_end = (HeapWord*) _g1_storage.high(); | |
| 1660 update_committed_space(old_end, new_end); | |
| 1661 | |
| 1662 FreeRegionList expansion_list("Local Expansion List"); | |
| 1663 MemRegion mr = _hrs.expand_by(old_end, new_end, &expansion_list); | |
| 1664 assert(mr.start() == old_end, "post-condition"); | |
| 1665 // mr might be a smaller region than what was requested if | |
| 1666 // expand_by() was unable to allocate the HeapRegion instances | |
| 1667 assert(mr.end() <= new_end, "post-condition"); | |
| 1668 | |
| 1669 size_t actual_expand_bytes = mr.byte_size(); | |
| 1670 assert(actual_expand_bytes <= aligned_expand_bytes, "post-condition"); | |
| 1671 assert(actual_expand_bytes == expansion_list.total_capacity_bytes(), | |
| 1672 "post-condition"); | |
| 1673 if (actual_expand_bytes < aligned_expand_bytes) { | |
| 1674 // We could not expand _hrs to the desired size. In this case we | |
| 1675 // need to shrink the committed space accordingly. | |
| 1676 assert(mr.end() < new_end, "invariant"); | |
| 1677 | |
| 1678 size_t diff_bytes = aligned_expand_bytes - actual_expand_bytes; | |
| 1679 // First uncommit the memory. | |
| 1680 _g1_storage.shrink_by(diff_bytes); | |
| 1681 // Then propagate this update to the necessary data structures. | |
| 1682 update_committed_space(new_end, mr.end()); | |
|
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1683 } |
| 3766 | 1684 _free_list.add_as_tail(&expansion_list); |
|
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1685 |
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1686 if (_hr_printer.is_active()) { |
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1687 HeapWord* curr = mr.start(); |
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1688 while (curr < mr.end()) { |
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1689 HeapWord* curr_end = curr + HeapRegion::GrainWords; |
|
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1690 _hr_printer.commit(curr, curr_end); |
|
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1691 curr = curr_end; |
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1692 } |
|
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1693 assert(curr == mr.end(), "post-condition"); |
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1694 } |
|
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1695 g1_policy()->record_new_heap_size(n_regions()); |
|
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1696 } else { |
|
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1697 ergo_verbose0(ErgoHeapSizing, |
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1698 "did not expand the heap", |
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1699 ergo_format_reason("heap expansion operation failed")); |
|
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1700 // The expansion of the virtual storage space was unsuccessful. |
|
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1701 // Let's see if it was because we ran out of swap. |
|
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1702 if (G1ExitOnExpansionFailure && |
|
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1703 _g1_storage.uncommitted_size() >= aligned_expand_bytes) { |
|
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1704 // We had head room... |
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1705 vm_exit_out_of_memory(aligned_expand_bytes, "G1 heap expansion"); |
| 342 | 1706 } |
| 1707 } | |
|
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1708 return successful; |
| 342 | 1709 } |
| 1710 | |
| 3766 | 1711 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) { |
| 342 | 1712 size_t old_mem_size = _g1_storage.committed_size(); |
| 1713 size_t aligned_shrink_bytes = | |
| 1714 ReservedSpace::page_align_size_down(shrink_bytes); | |
| 1715 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
| 1716 HeapRegion::GrainBytes); | |
| 1717 size_t num_regions_deleted = 0; | |
| 3766 | 1718 MemRegion mr = _hrs.shrink_by(aligned_shrink_bytes, &num_regions_deleted); |
| 1719 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
| 1720 assert(mr.end() == old_end, "post-condition"); | |
|
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1721 |
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1722 ergo_verbose3(ErgoHeapSizing, |
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1723 "shrink the heap", |
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1724 ergo_format_byte("requested shrinking amount") |
|
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1725 ergo_format_byte("aligned shrinking amount") |
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1726 ergo_format_byte("attempted shrinking amount"), |
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1727 shrink_bytes, aligned_shrink_bytes, mr.byte_size()); |
| 3766 | 1728 if (mr.byte_size() > 0) { |
|
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1729 if (_hr_printer.is_active()) { |
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1730 HeapWord* curr = mr.end(); |
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1731 while (curr > mr.start()) { |
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1732 HeapWord* curr_end = curr; |
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1733 curr -= HeapRegion::GrainWords; |
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1734 _hr_printer.uncommit(curr, curr_end); |
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1735 } |
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1736 assert(curr == mr.start(), "post-condition"); |
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1737 } |
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1738 |
| 342 | 1739 _g1_storage.shrink_by(mr.byte_size()); |
| 3766 | 1740 HeapWord* new_end = (HeapWord*) _g1_storage.high(); |
| 1741 assert(mr.start() == new_end, "post-condition"); | |
| 1742 | |
| 1743 _expansion_regions += num_regions_deleted; | |
| 1744 update_committed_space(old_end, new_end); | |
| 1745 HeapRegionRemSet::shrink_heap(n_regions()); | |
|
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1746 g1_policy()->record_new_heap_size(n_regions()); |
|
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1747 } else { |
|
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1748 ergo_verbose0(ErgoHeapSizing, |
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1749 "did not shrink the heap", |
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1750 ergo_format_reason("heap shrinking operation failed")); |
| 342 | 1751 } |
| 1752 } | |
| 1753 | |
| 1754 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
| 2152 | 1755 verify_region_sets_optional(); |
| 1756 | |
|
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1757 // We should only reach here at the end of a Full GC which means we |
|
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1758 // should not not be holding to any GC alloc regions. The method |
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1759 // below will make sure of that and do any remaining clean up. |
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1760 abandon_gc_alloc_regions(); |
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1761 |
| 2152 | 1762 // Instead of tearing down / rebuilding the free lists here, we |
| 1763 // could instead use the remove_all_pending() method on free_list to | |
| 1764 // remove only the ones that we need to remove. | |
| 4072 | 1765 tear_down_region_sets(true /* free_list_only */); |
| 342 | 1766 shrink_helper(shrink_bytes); |
| 4072 | 1767 rebuild_region_sets(true /* free_list_only */); |
| 2152 | 1768 |
| 3766 | 1769 _hrs.verify_optional(); |
| 2152 | 1770 verify_region_sets_optional(); |
| 342 | 1771 } |
| 1772 | |
| 1773 // Public methods. | |
| 1774 | |
| 1775 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 1776 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 1777 #endif // _MSC_VER | |
| 1778 | |
| 1779 | |
| 1780 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
| 1781 SharedHeap(policy_), | |
| 1782 _g1_policy(policy_), | |
| 1111 | 1783 _dirty_card_queue_set(false), |
| 1705 | 1784 _into_cset_dirty_card_queue_set(false), |
|
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1785 _is_alive_closure_cm(this), |
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1786 _is_alive_closure_stw(this), |
|
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1787 _ref_processor_cm(NULL), |
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1788 _ref_processor_stw(NULL), |
| 342 | 1789 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), |
| 1790 _bot_shared(NULL), | |
| 1791 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
| 1792 _evac_failure_scan_stack(NULL) , | |
| 1793 _mark_in_progress(false), | |
| 2152 | 1794 _cg1r(NULL), _summary_bytes_used(0), |
|
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1795 _g1mm(NULL), |
| 342 | 1796 _refine_cte_cl(NULL), |
| 1797 _full_collection(false), | |
| 2152 | 1798 _free_list("Master Free List"), |
| 1799 _secondary_free_list("Secondary Free List"), | |
| 4072 | 1800 _old_set("Old Set"), |
| 2152 | 1801 _humongous_set("Master Humongous Set"), |
| 1802 _free_regions_coming(false), | |
| 342 | 1803 _young_list(new YoungList(this)), |
| 1804 _gc_time_stamp(0), | |
|
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1805 _retained_old_gc_alloc_region(NULL), |
| 526 | 1806 _surviving_young_words(NULL), |
|
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|
1807 _full_collections_completed(0), |
| 526 | 1808 _in_cset_fast_test(NULL), |
|
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1809 _in_cset_fast_test_base(NULL), |
|
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1810 _dirty_cards_region_list(NULL) { |
| 342 | 1811 _g1h = this; // To catch bugs. |
| 1812 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
| 1813 vm_exit_during_initialization("Failed necessary allocation."); | |
| 1814 } | |
|
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1815 |
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1816 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1817 |
| 342 | 1818 int n_queues = MAX2((int)ParallelGCThreads, 1); |
| 1819 _task_queues = new RefToScanQueueSet(n_queues); | |
| 1820 | |
| 1821 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
| 1822 assert(n_rem_sets > 0, "Invariant."); | |
| 1823 | |
| 1824 HeapRegionRemSetIterator** iter_arr = | |
| 1825 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
| 1826 for (int i = 0; i < n_queues; i++) { | |
| 1827 iter_arr[i] = new HeapRegionRemSetIterator(); | |
| 1828 } | |
| 1829 _rem_set_iterator = iter_arr; | |
| 1830 | |
| 1831 for (int i = 0; i < n_queues; i++) { | |
| 1832 RefToScanQueue* q = new RefToScanQueue(); | |
| 1833 q->initialize(); | |
| 1834 _task_queues->register_queue(i, q); | |
| 1835 } | |
| 1836 | |
| 1837 guarantee(_task_queues != NULL, "task_queues allocation failure."); | |
| 1838 } | |
| 1839 | |
| 1840 jint G1CollectedHeap::initialize() { | |
| 1166 | 1841 CollectedHeap::pre_initialize(); |
| 342 | 1842 os::enable_vtime(); |
| 1843 | |
| 1844 // Necessary to satisfy locking discipline assertions. | |
| 1845 | |
| 1846 MutexLocker x(Heap_lock); | |
| 1847 | |
|
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1848 // We have to initialize the printer before committing the heap, as |
|
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1849 // it will be used then. |
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1850 _hr_printer.set_active(G1PrintHeapRegions); |
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1851 |
| 342 | 1852 // While there are no constraints in the GC code that HeapWordSize |
| 1853 // be any particular value, there are multiple other areas in the | |
| 1854 // system which believe this to be true (e.g. oop->object_size in some | |
| 1855 // cases incorrectly returns the size in wordSize units rather than | |
| 1856 // HeapWordSize). | |
| 1857 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
| 1858 | |
| 1859 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
| 1860 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
| 1861 | |
| 1862 // Ensure that the sizes are properly aligned. | |
| 1863 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1864 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1865 | |
| 1866 _cg1r = new ConcurrentG1Refine(); | |
| 1867 | |
| 1868 // Reserve the maximum. | |
| 1869 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
| 1870 // Includes the perm-gen. | |
|
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1871 |
|
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1872 // When compressed oops are enabled, the preferred heap base |
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1873 // is calculated by subtracting the requested size from the |
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1874 // 32Gb boundary and using the result as the base address for |
|
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1875 // heap reservation. If the requested size is not aligned to |
|
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1876 // HeapRegion::GrainBytes (i.e. the alignment that is passed |
|
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1877 // into the ReservedHeapSpace constructor) then the actual |
|
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1878 // base of the reserved heap may end up differing from the |
|
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|
1879 // address that was requested (i.e. the preferred heap base). |
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1880 // If this happens then we could end up using a non-optimal |
|
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1881 // compressed oops mode. |
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|
1882 |
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1883 // Since max_byte_size is aligned to the size of a heap region (checked |
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1884 // above), we also need to align the perm gen size as it might not be. |
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|
1885 const size_t total_reserved = max_byte_size + |
|
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|
1886 align_size_up(pgs->max_size(), HeapRegion::GrainBytes); |
|
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|
1887 Universe::check_alignment(total_reserved, HeapRegion::GrainBytes, "g1 heap and perm"); |
|
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1888 |
|
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1889 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1890 |
|
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1891 ReservedHeapSpace heap_rs(total_reserved, HeapRegion::GrainBytes, |
|
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1892 UseLargePages, addr); |
|
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1893 |
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1894 if (UseCompressedOops) { |
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1895 if (addr != NULL && !heap_rs.is_reserved()) { |
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1896 // Failed to reserve at specified address - the requested memory |
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1897 // region is taken already, for example, by 'java' launcher. |
|
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1898 // Try again to reserver heap higher. |
|
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1899 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
|
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1900 |
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1901 ReservedHeapSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1902 UseLargePages, addr); |
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1903 |
|
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1904 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1905 // Failed to reserve at specified address again - give up. |
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1906 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1907 assert(addr == NULL, ""); |
|
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1908 |
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1909 ReservedHeapSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
|
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1910 UseLargePages, addr); |
|
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1911 heap_rs = heap_rs1; |
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1912 } else { |
|
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1913 heap_rs = heap_rs0; |
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1914 } |
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1915 } |
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1916 } |
| 342 | 1917 |
| 1918 if (!heap_rs.is_reserved()) { | |
| 1919 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
| 1920 return JNI_ENOMEM; | |
| 1921 } | |
| 1922 | |
| 1923 // It is important to do this in a way such that concurrent readers can't | |
| 1924 // temporarily think somethings in the heap. (I've actually seen this | |
| 1925 // happen in asserts: DLD.) | |
| 1926 _reserved.set_word_size(0); | |
| 1927 _reserved.set_start((HeapWord*)heap_rs.base()); | |
| 1928 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 1929 | |
| 1930 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
| 1931 | |
| 1932 // Create the gen rem set (and barrier set) for the entire reserved region. | |
| 1933 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
| 1934 set_barrier_set(rem_set()->bs()); | |
| 1935 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
| 1936 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
| 1937 } else { | |
| 1938 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
| 1939 return JNI_ENOMEM; | |
| 1940 } | |
| 1941 | |
| 1942 // Also create a G1 rem set. | |
| 1861 | 1943 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { |
| 1944 _g1_rem_set = new G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
| 342 | 1945 } else { |
| 1861 | 1946 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); |
| 1947 return JNI_ENOMEM; | |
| 342 | 1948 } |
| 1949 | |
| 1950 // Carve out the G1 part of the heap. | |
| 1951 | |
| 1952 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
| 1953 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
| 1954 g1_rs.size()/HeapWordSize); | |
| 1955 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
| 1956 | |
| 1957 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
| 1958 | |
| 1959 _g1_storage.initialize(g1_rs, 0); | |
| 1960 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
| 3766 | 1961 _hrs.initialize((HeapWord*) _g1_reserved.start(), |
| 1962 (HeapWord*) _g1_reserved.end(), | |
| 1963 _expansion_regions); | |
| 342 | 1964 |
|
807
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1965 // 6843694 - ensure that the maximum region index can fit |
|
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1966 // in the remembered set structures. |
|
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1967 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
|
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|
1968 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
|
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1969 |
|
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1970 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
|
942
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|
1971 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
|
3986
65a8ff39a6da
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|
1972 guarantee(HeapRegion::CardsPerRegion < max_cards_per_region, |
|
942
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|
1973 "too many cards per region"); |
|
807
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|
1974 |
| 2152 | 1975 HeapRegionSet::set_unrealistically_long_length(max_regions() + 1); |
| 1976 | |
| 342 | 1977 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
| 1978 heap_word_size(init_byte_size)); | |
| 1979 | |
| 1980 _g1h = this; | |
| 1981 | |
|
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1982 _in_cset_fast_test_length = max_regions(); |
|
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|
1983 _in_cset_fast_test_base = NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); |
|
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|
1984 |
|
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|
1985 // We're biasing _in_cset_fast_test to avoid subtracting the |
|
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|
1986 // beginning of the heap every time we want to index; basically |
|
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|
1987 // it's the same with what we do with the card table. |
|
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|
1988 _in_cset_fast_test = _in_cset_fast_test_base - |
|
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|
1989 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
|
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|
1990 |
|
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|
1991 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
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|
1992 // regions to the incremental collection set for the first |
|
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|
1993 // evacuation pause. |
|
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|
1994 clear_cset_fast_test(); |
|
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|
1995 |
| 342 | 1996 // Create the ConcurrentMark data structure and thread. |
| 1997 // (Must do this late, so that "max_regions" is defined.) | |
| 1998 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
| 1999 _cmThread = _cm->cmThread(); | |
| 2000 | |
| 2001 // Initialize the from_card cache structure of HeapRegionRemSet. | |
| 2002 HeapRegionRemSet::init_heap(max_regions()); | |
| 2003 | |
| 677 | 2004 // Now expand into the initial heap size. |
|
2188
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|
2005 if (!expand(init_byte_size)) { |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
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|
2006 vm_exit_during_initialization("Failed to allocate initial heap."); |
|
c33825b68624
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|
2007 return JNI_ENOMEM; |
|
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|
2008 } |
| 342 | 2009 |
| 2010 // Perform any initialization actions delegated to the policy. | |
| 2011 g1_policy()->init(); | |
| 2012 | |
| 2013 _refine_cte_cl = | |
| 2014 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
| 2015 g1_rem_set(), | |
| 2016 concurrent_g1_refine()); | |
| 2017 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 2018 | |
| 2019 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
| 2020 SATB_Q_FL_lock, | |
| 1111 | 2021 G1SATBProcessCompletedThreshold, |
| 342 | 2022 Shared_SATB_Q_lock); |
| 794 | 2023 |
| 2024 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
| 2025 DirtyCardQ_FL_lock, | |
| 1111 | 2026 concurrent_g1_refine()->yellow_zone(), |
| 2027 concurrent_g1_refine()->red_zone(), | |
| 794 | 2028 Shared_DirtyCardQ_lock); |
| 2029 | |
|
616
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|
2030 if (G1DeferredRSUpdate) { |
|
4f360ec815ba
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diff
changeset
|
2031 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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diff
changeset
|
2032 DirtyCardQ_FL_lock, |
| 1111 | 2033 -1, // never trigger processing |
| 2034 -1, // no limit on length | |
|
616
4f360ec815ba
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|
2035 Shared_DirtyCardQ_lock, |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
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|
2036 &JavaThread::dirty_card_queue_set()); |
|
4f360ec815ba
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|
2037 } |
| 1705 | 2038 |
| 2039 // Initialize the card queue set used to hold cards containing | |
| 2040 // references into the collection set. | |
| 2041 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
| 2042 DirtyCardQ_FL_lock, | |
| 2043 -1, // never trigger processing | |
| 2044 -1, // no limit on length | |
| 2045 Shared_DirtyCardQ_lock, | |
| 2046 &JavaThread::dirty_card_queue_set()); | |
| 2047 | |
| 342 | 2048 // In case we're keeping closure specialization stats, initialize those |
| 2049 // counts and that mechanism. | |
| 2050 SpecializationStats::clear(); | |
| 2051 | |
| 2052 // Do later initialization work for concurrent refinement. | |
| 2053 _cg1r->init(); | |
| 2054 | |
|
2433
abdfc822206f
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diff
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|
2055 // Here we allocate the dummy full region that is required by the |
|
abdfc822206f
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|
2056 // G1AllocRegion class. If we don't pass an address in the reserved |
|
abdfc822206f
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diff
changeset
|
2057 // space here, lots of asserts fire. |
| 3766 | 2058 |
| 2059 HeapRegion* dummy_region = new_heap_region(0 /* index of bottom region */, | |
| 2060 _g1_reserved.start()); | |
|
2433
abdfc822206f
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diff
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|
2061 // We'll re-use the same region whether the alloc region will |
|
abdfc822206f
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2432
diff
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|
2062 // require BOT updates or not and, if it doesn't, then a non-young |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
2063 // region will complain that it cannot support allocations without |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
2064 // BOT updates. So we'll tag the dummy region as young to avoid that. |
|
abdfc822206f
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diff
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|
2065 dummy_region->set_young(); |
|
abdfc822206f
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diff
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|
2066 // Make sure it's full. |
|
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|
2067 dummy_region->set_top(dummy_region->end()); |
|
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|
2068 G1AllocRegion::setup(this, dummy_region); |
|
abdfc822206f
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|
2069 |
|
abdfc822206f
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|
2070 init_mutator_alloc_region(); |
|
abdfc822206f
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|
2071 |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
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|
2072 // Do create of the monitoring and management support so that |
|
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
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diff
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|
2073 // values in the heap have been properly initialized. |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
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3979
diff
changeset
|
2074 _g1mm = new G1MonitoringSupport(this); |
|
3289
b52782ae3880
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diff
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|
2075 |
| 342 | 2076 return JNI_OK; |
| 2077 } | |
| 2078 | |
| 2079 void G1CollectedHeap::ref_processing_init() { | |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2080 // Reference processing in G1 currently works as follows: |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
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1973
diff
changeset
|
2081 // |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
2082 // * There are two reference processor instances. One is |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
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diff
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|
2083 // used to record and process discovered references |
|
4dfb2df418f2
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diff
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|
2084 // during concurrent marking; the other is used to |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
2085 // record and process references during STW pauses |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
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|
2086 // (both full and incremental). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
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diff
changeset
|
2087 // * Both ref processors need to 'span' the entire heap as |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
2088 // the regions in the collection set may be dotted around. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2089 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
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|
2090 // * For the concurrent marking ref processor: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
2091 // * Reference discovery is enabled at initial marking. |
|
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|
2092 // * Reference discovery is disabled and the discovered |
|
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6484982: G1: process references during evacuation pauses
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|
2093 // references processed etc during remarking. |
|
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|
2094 // * Reference discovery is MT (see below). |
|
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|
2095 // * Reference discovery requires a barrier (see below). |
|
4dfb2df418f2
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|
2096 // * Reference processing may or may not be MT |
|
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|
2097 // (depending on the value of ParallelRefProcEnabled |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
2098 // and ParallelGCThreads). |
|
4dfb2df418f2
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|
2099 // * A full GC disables reference discovery by the CM |
|
4dfb2df418f2
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|
2100 // ref processor and abandons any entries on it's |
|
4dfb2df418f2
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|
2101 // discovered lists. |
|
4dfb2df418f2
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|
2102 // |
|
4dfb2df418f2
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|
2103 // * For the STW processor: |
|
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|
2104 // * Non MT discovery is enabled at the start of a full GC. |
|
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|
2105 // * Processing and enqueueing during a full GC is non-MT. |
|
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|
2106 // * During a full GC, references are processed after marking. |
|
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|
2107 // |
|
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|
2108 // * Discovery (may or may not be MT) is enabled at the start |
|
4dfb2df418f2
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|
2109 // of an incremental evacuation pause. |
|
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|
2110 // * References are processed near the end of a STW evacuation pause. |
|
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|
2111 // * For both types of GC: |
|
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|
2112 // * Discovery is atomic - i.e. not concurrent. |
|
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|
2113 // * Reference discovery will not need a barrier. |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
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diff
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|
2114 |
| 342 | 2115 SharedHeap::ref_processing_init(); |
| 2116 MemRegion mr = reserved_region(); | |
|
3979
4dfb2df418f2
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|
2117 |
|
4dfb2df418f2
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|
2118 // Concurrent Mark ref processor |
|
4dfb2df418f2
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|
2119 _ref_processor_cm = |
|
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
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2361
diff
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|
2120 new ReferenceProcessor(mr, // span |
|
3979
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|
2121 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
|
4dfb2df418f2
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diff
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|
2122 // mt processing |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
2123 (int) ParallelGCThreads, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
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diff
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|
2124 // degree of mt processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
2125 (ParallelGCThreads > 1) || (ConcGCThreads > 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
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|
2126 // mt discovery |
|
4dfb2df418f2
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diff
changeset
|
2127 (int) MAX2(ParallelGCThreads, ConcGCThreads), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2128 // degree of mt discovery |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2129 false, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2130 // Reference discovery is not atomic |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
2131 &_is_alive_closure_cm, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
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|
2132 // is alive closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2133 // (for efficiency/performance) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2134 true); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2135 // Setting next fields of discovered |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2136 // lists requires a barrier. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2137 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2138 // STW ref processor |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2139 _ref_processor_stw = |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2140 new ReferenceProcessor(mr, // span |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2141 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2142 // mt processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2143 MAX2((int)ParallelGCThreads, 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2144 // degree of mt processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2145 (ParallelGCThreads > 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2146 // mt discovery |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2147 MAX2((int)ParallelGCThreads, 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2148 // degree of mt discovery |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2149 true, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2150 // Reference discovery is atomic |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2151 &_is_alive_closure_stw, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2152 // is alive closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2153 // (for efficiency/performance) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2154 false); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2155 // Setting next fields of discovered |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
2156 // lists requires a barrier. |
| 342 | 2157 } |
| 2158 | |
| 2159 size_t G1CollectedHeap::capacity() const { | |
| 2160 return _g1_committed.byte_size(); | |
| 2161 } | |
| 2162 | |
| 1705 | 2163 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
| 2164 DirtyCardQueue* into_cset_dcq, | |
| 2165 bool concurrent, | |
| 342 | 2166 int worker_i) { |
| 889 | 2167 // Clean cards in the hot card cache |
| 1705 | 2168 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set(), into_cset_dcq); |
| 889 | 2169 |
| 342 | 2170 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
| 2171 int n_completed_buffers = 0; | |
| 1705 | 2172 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
| 342 | 2173 n_completed_buffers++; |
| 2174 } | |
| 2175 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
| 2176 (double) n_completed_buffers); | |
| 2177 dcqs.clear_n_completed_buffers(); | |
| 2178 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
| 2179 } | |
| 2180 | |
| 2181 | |
| 2182 // Computes the sum of the storage used by the various regions. | |
| 2183 | |
| 2184 size_t G1CollectedHeap::used() const { | |
|
862
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
ysr
parents:
861
diff
changeset
|
2185 assert(Heap_lock->owner() != NULL, |
|
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
ysr
parents:
861
diff
changeset
|
2186 "Should be owned on this thread's behalf."); |
| 342 | 2187 size_t result = _summary_bytes_used; |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2188 // 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
|
2189 HeapRegion* hr = _mutator_alloc_region.get(); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2190 if (hr != NULL) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2191 result += hr->used(); |
| 342 | 2192 return result; |
| 2193 } | |
| 2194 | |
|
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2195 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
|
2196 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
|
2197 return result; |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2198 } |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2199 |
| 342 | 2200 class SumUsedClosure: public HeapRegionClosure { |
| 2201 size_t _used; | |
| 2202 public: | |
| 2203 SumUsedClosure() : _used(0) {} | |
| 2204 bool doHeapRegion(HeapRegion* r) { | |
| 2205 if (!r->continuesHumongous()) { | |
| 2206 _used += r->used(); | |
| 2207 } | |
| 2208 return false; | |
| 2209 } | |
| 2210 size_t result() { return _used; } | |
| 2211 }; | |
| 2212 | |
| 2213 size_t G1CollectedHeap::recalculate_used() const { | |
| 2214 SumUsedClosure blk; | |
| 3766 | 2215 heap_region_iterate(&blk); |
| 342 | 2216 return blk.result(); |
| 2217 } | |
| 2218 | |
| 2219 size_t G1CollectedHeap::unsafe_max_alloc() { | |
| 2152 | 2220 if (free_regions() > 0) return HeapRegion::GrainBytes; |
| 342 | 2221 // otherwise, is there space in the current allocation region? |
| 2222 | |
| 2223 // We need to store the current allocation region in a local variable | |
| 2224 // here. The problem is that this method doesn't take any locks and | |
| 2225 // there may be other threads which overwrite the current allocation | |
| 2226 // region field. attempt_allocation(), for example, sets it to NULL | |
| 2227 // and this can happen *after* the NULL check here but before the call | |
| 2228 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
| 2229 // to be a problem in the optimized build, since the two loads of the | |
| 2230 // current allocation region field are optimized away. | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2231 HeapRegion* hr = _mutator_alloc_region.get(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2232 if (hr == NULL) { |
| 342 | 2233 return 0; |
| 2234 } | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
2235 return hr->free(); |
| 342 | 2236 } |
| 2237 | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
changeset
|
2238 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
|
2239 return |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2240 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2241 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2242 } |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2243 |
|
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
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2433
diff
changeset
|
2244 #ifndef PRODUCT |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2245 void G1CollectedHeap::allocate_dummy_regions() { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2246 // Let's fill up most of the region |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2247 size_t word_size = HeapRegion::GrainWords - 1024; |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2248 // 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
|
2249 guarantee(isHumongous(word_size), "sanity"); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2250 |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2251 for (uintx i = 0; i < G1DummyRegionsPerGC; ++i) { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2252 // Let's use the existing mechanism for the allocation |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
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2433
diff
changeset
|
2253 HeapWord* dummy_obj = humongous_obj_allocate(word_size); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2254 if (dummy_obj != NULL) { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2255 MemRegion mr(dummy_obj, word_size); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2256 CollectedHeap::fill_with_object(mr); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
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2433
diff
changeset
|
2257 } else { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2258 // 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
|
2259 // again. Let's get out of the loop. |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
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2433
diff
changeset
|
2260 break; |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2261 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2262 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2263 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2264 #endif // !PRODUCT |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2265 |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2266 void G1CollectedHeap::increment_full_collections_completed(bool concurrent) { |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
changeset
|
2267 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
|
4e5661ba9d98
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|
2268 |
|
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|
2269 // We assume that if concurrent == true, then the caller is a |
|
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|
2270 // concurrent thread that was joined the Suspendible Thread |
|
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|
2271 // Set. If there's ever a cheap way to check this, we should add an |
|
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|
2272 // assert here. |
|
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|
2273 |
|
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|
2274 // We have already incremented _total_full_collections at the start |
|
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|
2275 // of the GC, so total_full_collections() represents how many full |
|
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|
2276 // collections have been started. |
|
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|
2277 unsigned int full_collections_started = total_full_collections(); |
|
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|
2278 |
|
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|
2279 // Given that this method is called at the end of a Full GC or of a |
|
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|
2280 // concurrent cycle, and those can be nested (i.e., a Full GC can |
|
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|
2281 // interrupt a concurrent cycle), the number of full collections |
|
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|
2282 // completed should be either one (in the case where there was no |
|
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|
2283 // nesting) or two (when a Full GC interrupted a concurrent cycle) |
|
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|
2284 // behind the number of full collections started. |
|
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|
2285 |
|
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|
2286 // This is the case for the inner caller, i.e. a Full GC. |
|
2030
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|
2287 assert(concurrent || |
|
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|
2288 (full_collections_started == _full_collections_completed + 1) || |
|
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|
2289 (full_collections_started == _full_collections_completed + 2), |
|
2030
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|
2290 err_msg("for inner caller (Full GC): full_collections_started = %u " |
|
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|
2291 "is inconsistent with _full_collections_completed = %u", |
|
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|
2292 full_collections_started, _full_collections_completed)); |
|
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|
2293 |
|
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|
2294 // This is the case for the outer caller, i.e. the concurrent cycle. |
|
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|
2295 assert(!concurrent || |
|
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|
2296 (full_collections_started == _full_collections_completed + 1), |
|
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|
2297 err_msg("for outer caller (concurrent cycle): " |
|
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|
2298 "full_collections_started = %u " |
|
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|
2299 "is inconsistent with _full_collections_completed = %u", |
|
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|
2300 full_collections_started, _full_collections_completed)); |
|
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|
2301 |
|
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|
2302 _full_collections_completed += 1; |
|
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|
2303 |
|
1840
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|
2304 // We need to clear the "in_progress" flag in the CM thread before |
|
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|
2305 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
|
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|
2306 // is set) so that if a waiter requests another System.gc() it doesn't |
|
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|
2307 // incorrectly see that a marking cyle is still in progress. |
|
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|
2308 if (concurrent) { |
|
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|
2309 _cmThread->clear_in_progress(); |
|
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|
2310 } |
|
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|
2311 |
|
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|
2312 // This notify_all() will ensure that a thread that called |
|
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|
2313 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
|
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|
2314 // and it's waiting for a full GC to finish will be woken up. It is |
|
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|
2315 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
|
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|
2316 FullGCCount_lock->notify_all(); |
|
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|
2317 } |
|
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|
2318 |
| 342 | 2319 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
| 2152 | 2320 assert_at_safepoint(true /* should_be_vm_thread */); |
| 342 | 2321 GCCauseSetter gcs(this, cause); |
| 2322 switch (cause) { | |
| 2323 case GCCause::_heap_inspection: | |
| 2324 case GCCause::_heap_dump: { | |
| 2325 HandleMark hm; | |
| 2326 do_full_collection(false); // don't clear all soft refs | |
| 2327 break; | |
| 2328 } | |
| 2329 default: // XXX FIX ME | |
| 2330 ShouldNotReachHere(); // Unexpected use of this function | |
| 2331 } | |
| 2332 } | |
| 2333 | |
|
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|
2334 void G1CollectedHeap::collect(GCCause::Cause cause) { |
|
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|
2335 // The caller doesn't have the Heap_lock |
|
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|
2336 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
|
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|
2337 |
|
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|
2338 unsigned int gc_count_before; |
|
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|
2339 unsigned int full_gc_count_before; |
| 342 | 2340 { |
|
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|
2341 MutexLocker ml(Heap_lock); |
| 1973 | 2342 |
|
1088
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|
2343 // Read the GC count while holding the Heap_lock |
|
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|
2344 gc_count_before = SharedHeap::heap()->total_collections(); |
|
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|
2345 full_gc_count_before = SharedHeap::heap()->total_full_collections(); |
|
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|
2346 } |
|
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|
2347 |
|
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|
2348 if (should_do_concurrent_full_gc(cause)) { |
|
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|
2349 // Schedule an initial-mark evacuation pause that will start a |
| 1973 | 2350 // concurrent cycle. We're setting word_size to 0 which means that |
| 2351 // we are not requesting a post-GC allocation. | |
|
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|
2352 VM_G1IncCollectionPause op(gc_count_before, |
| 1973 | 2353 0, /* word_size */ |
| 2354 true, /* should_initiate_conc_mark */ | |
|
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|
2355 g1_policy()->max_pause_time_ms(), |
|
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|
2356 cause); |
|
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|
2357 VMThread::execute(&op); |
|
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|
2358 } else { |
|
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|
2359 if (cause == GCCause::_gc_locker |
|
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|
2360 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
|
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|
2361 |
| 1973 | 2362 // Schedule a standard evacuation pause. We're setting word_size |
| 2363 // to 0 which means that we are not requesting a post-GC allocation. | |
|
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|
2364 VM_G1IncCollectionPause op(gc_count_before, |
| 1973 | 2365 0, /* word_size */ |
|
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|
2366 false, /* should_initiate_conc_mark */ |
|
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|
2367 g1_policy()->max_pause_time_ms(), |
|
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|
2368 cause); |
|
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|
2369 VMThread::execute(&op); |
|
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|
2370 } else { |
|
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|
2371 // Schedule a Full GC. |
|
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|
2372 VM_G1CollectFull op(gc_count_before, full_gc_count_before, cause); |
|
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|
2373 VMThread::execute(&op); |
|
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|
2374 } |
| 342 | 2375 } |
| 2376 } | |
| 2377 | |
| 2378 bool G1CollectedHeap::is_in(const void* p) const { | |
| 3766 | 2379 HeapRegion* hr = _hrs.addr_to_region((HeapWord*) p); |
| 2380 if (hr != NULL) { | |
| 342 | 2381 return hr->is_in(p); |
| 2382 } else { | |
| 2383 return _perm_gen->as_gen()->is_in(p); | |
| 2384 } | |
| 2385 } | |
| 2386 | |
| 2387 // Iteration functions. | |
| 2388 | |
| 2389 // Iterates an OopClosure over all ref-containing fields of objects | |
| 2390 // within a HeapRegion. | |
| 2391 | |
| 2392 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
| 2393 MemRegion _mr; | |
| 2394 OopClosure* _cl; | |
| 2395 public: | |
| 2396 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
| 2397 : _mr(mr), _cl(cl) {} | |
| 2398 bool doHeapRegion(HeapRegion* r) { | |
| 2399 if (! r->continuesHumongous()) { | |
| 2400 r->oop_iterate(_cl); | |
| 2401 } | |
| 2402 return false; | |
| 2403 } | |
| 2404 }; | |
| 2405 | |
| 678 | 2406 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
| 342 | 2407 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
| 3766 | 2408 heap_region_iterate(&blk); |
| 678 | 2409 if (do_perm) { |
| 2410 perm_gen()->oop_iterate(cl); | |
| 2411 } | |
| 342 | 2412 } |
| 2413 | |
| 678 | 2414 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
| 342 | 2415 IterateOopClosureRegionClosure blk(mr, cl); |
| 3766 | 2416 heap_region_iterate(&blk); |
| 678 | 2417 if (do_perm) { |
| 2418 perm_gen()->oop_iterate(cl); | |
| 2419 } | |
| 342 | 2420 } |
| 2421 | |
| 2422 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
| 2423 | |
| 2424 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
| 2425 ObjectClosure* _cl; | |
| 2426 public: | |
| 2427 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
| 2428 bool doHeapRegion(HeapRegion* r) { | |
| 2429 if (! r->continuesHumongous()) { | |
| 2430 r->object_iterate(_cl); | |
| 2431 } | |
| 2432 return false; | |
| 2433 } | |
| 2434 }; | |
| 2435 | |
| 678 | 2436 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
| 342 | 2437 IterateObjectClosureRegionClosure blk(cl); |
| 3766 | 2438 heap_region_iterate(&blk); |
| 678 | 2439 if (do_perm) { |
| 2440 perm_gen()->object_iterate(cl); | |
| 2441 } | |
| 342 | 2442 } |
| 2443 | |
| 2444 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
| 2445 // FIXME: is this right? | |
| 2446 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
| 2447 } | |
| 2448 | |
| 2449 // Calls a SpaceClosure on a HeapRegion. | |
| 2450 | |
| 2451 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
| 2452 SpaceClosure* _cl; | |
| 2453 public: | |
| 2454 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
| 2455 bool doHeapRegion(HeapRegion* r) { | |
| 2456 _cl->do_space(r); | |
| 2457 return false; | |
| 2458 } | |
| 2459 }; | |
| 2460 | |
| 2461 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
| 2462 SpaceClosureRegionClosure blk(cl); | |
| 3766 | 2463 heap_region_iterate(&blk); |
| 342 | 2464 } |
| 2465 | |
| 3766 | 2466 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const { |
| 2467 _hrs.iterate(cl); | |
| 342 | 2468 } |
| 2469 | |
| 2470 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
| 3766 | 2471 HeapRegionClosure* cl) const { |
| 2472 _hrs.iterate_from(r, cl); | |
| 342 | 2473 } |
| 2474 | |
| 2475 void | |
| 2476 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
| 2477 int worker, | |
| 2478 jint claim_value) { | |
| 355 | 2479 const size_t regions = n_regions(); |
|
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|
2480 const size_t worker_num = (G1CollectedHeap::use_parallel_gc_threads() ? ParallelGCThreads : 1); |
| 355 | 2481 // try to spread out the starting points of the workers |
| 2482 const size_t start_index = regions / worker_num * (size_t) worker; | |
| 2483 | |
| 2484 // each worker will actually look at all regions | |
| 2485 for (size_t count = 0; count < regions; ++count) { | |
| 2486 const size_t index = (start_index + count) % regions; | |
| 2487 assert(0 <= index && index < regions, "sanity"); | |
| 2488 HeapRegion* r = region_at(index); | |
| 2489 // we'll ignore "continues humongous" regions (we'll process them | |
| 2490 // when we come across their corresponding "start humongous" | |
| 2491 // region) and regions already claimed | |
| 2492 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
| 2493 continue; | |
| 2494 } | |
| 2495 // OK, try to claim it | |
| 342 | 2496 if (r->claimHeapRegion(claim_value)) { |
| 355 | 2497 // success! |
| 2498 assert(!r->continuesHumongous(), "sanity"); | |
| 2499 if (r->startsHumongous()) { | |
| 2500 // If the region is "starts humongous" we'll iterate over its | |
| 2501 // "continues humongous" first; in fact we'll do them | |
| 2502 // first. The order is important. In on case, calling the | |
| 2503 // closure on the "starts humongous" region might de-allocate | |
| 2504 // and clear all its "continues humongous" regions and, as a | |
| 2505 // result, we might end up processing them twice. So, we'll do | |
| 2506 // them first (notice: most closures will ignore them anyway) and | |
| 2507 // then we'll do the "starts humongous" region. | |
| 2508 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
| 2509 HeapRegion* chr = region_at(ch_index); | |
| 2510 | |
| 2511 // if the region has already been claimed or it's not | |
| 2512 // "continues humongous" we're done | |
| 2513 if (chr->claim_value() == claim_value || | |
| 2514 !chr->continuesHumongous()) { | |
| 2515 break; | |
| 2516 } | |
| 2517 | |
| 2518 // Noone should have claimed it directly. We can given | |
| 2519 // that we claimed its "starts humongous" region. | |
| 2520 assert(chr->claim_value() != claim_value, "sanity"); | |
| 2521 assert(chr->humongous_start_region() == r, "sanity"); | |
| 2522 | |
| 2523 if (chr->claimHeapRegion(claim_value)) { | |
| 2524 // we should always be able to claim it; noone else should | |
| 2525 // be trying to claim this region | |
| 2526 | |
| 2527 bool res2 = cl->doHeapRegion(chr); | |
| 2528 assert(!res2, "Should not abort"); | |
| 2529 | |
| 2530 // Right now, this holds (i.e., no closure that actually | |
| 2531 // does something with "continues humongous" regions | |
| 2532 // clears them). We might have to weaken it in the future, | |
| 2533 // but let's leave these two asserts here for extra safety. | |
| 2534 assert(chr->continuesHumongous(), "should still be the case"); | |
| 2535 assert(chr->humongous_start_region() == r, "sanity"); | |
| 2536 } else { | |
| 2537 guarantee(false, "we should not reach here"); | |
| 2538 } | |
| 2539 } | |
| 2540 } | |
| 2541 | |
| 2542 assert(!r->continuesHumongous(), "sanity"); | |
| 2543 bool res = cl->doHeapRegion(r); | |
| 2544 assert(!res, "Should not abort"); | |
| 2545 } | |
| 2546 } | |
| 2547 } | |
| 2548 | |
| 390 | 2549 class ResetClaimValuesClosure: public HeapRegionClosure { |
| 2550 public: | |
| 2551 bool doHeapRegion(HeapRegion* r) { | |
| 2552 r->set_claim_value(HeapRegion::InitialClaimValue); | |
| 2553 return false; | |
| 2554 } | |
| 2555 }; | |
| 2556 | |
| 2557 void | |
| 2558 G1CollectedHeap::reset_heap_region_claim_values() { | |
| 2559 ResetClaimValuesClosure blk; | |
| 2560 heap_region_iterate(&blk); | |
| 2561 } | |
| 2562 | |
| 355 | 2563 #ifdef ASSERT |
| 2564 // This checks whether all regions in the heap have the correct claim | |
| 2565 // value. I also piggy-backed on this a check to ensure that the | |
| 2566 // humongous_start_region() information on "continues humongous" | |
| 2567 // regions is correct. | |
| 2568 | |
| 2569 class CheckClaimValuesClosure : public HeapRegionClosure { | |
| 2570 private: | |
| 2571 jint _claim_value; | |
| 2572 size_t _failures; | |
| 2573 HeapRegion* _sh_region; | |
| 2574 public: | |
| 2575 CheckClaimValuesClosure(jint claim_value) : | |
| 2576 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
| 2577 bool doHeapRegion(HeapRegion* r) { | |
| 2578 if (r->claim_value() != _claim_value) { | |
| 2579 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
| 2580 "claim value = %d, should be %d", | |
| 2581 r->bottom(), r->end(), r->claim_value(), | |
| 2582 _claim_value); | |
| 2583 ++_failures; | |
| 2584 } | |
| 2585 if (!r->isHumongous()) { | |
| 2586 _sh_region = NULL; | |
| 2587 } else if (r->startsHumongous()) { | |
| 2588 _sh_region = r; | |
| 2589 } else if (r->continuesHumongous()) { | |
| 2590 if (r->humongous_start_region() != _sh_region) { | |
| 2591 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
| 2592 "HS = "PTR_FORMAT", should be "PTR_FORMAT, | |
| 2593 r->bottom(), r->end(), | |
| 2594 r->humongous_start_region(), | |
| 2595 _sh_region); | |
| 2596 ++_failures; | |
| 342 | 2597 } |
| 2598 } | |
| 355 | 2599 return false; |
| 2600 } | |
| 2601 size_t failures() { | |
| 2602 return _failures; | |
| 2603 } | |
| 2604 }; | |
| 2605 | |
| 2606 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
| 2607 CheckClaimValuesClosure cl(claim_value); | |
| 2608 heap_region_iterate(&cl); | |
| 2609 return cl.failures() == 0; | |
| 2610 } | |
| 2611 #endif // ASSERT | |
| 342 | 2612 |
| 2613 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { | |
| 2614 HeapRegion* r = g1_policy()->collection_set(); | |
| 2615 while (r != NULL) { | |
| 2616 HeapRegion* next = r->next_in_collection_set(); | |
| 2617 if (cl->doHeapRegion(r)) { | |
| 2618 cl->incomplete(); | |
| 2619 return; | |
| 2620 } | |
| 2621 r = next; | |
| 2622 } | |
| 2623 } | |
| 2624 | |
| 2625 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
| 2626 HeapRegionClosure *cl) { | |
|
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2627 if (r == NULL) { |
|
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2628 // The CSet is empty so there's nothing to do. |
|
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|
2629 return; |
|
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|
2630 } |
|
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|
2631 |
| 342 | 2632 assert(r->in_collection_set(), |
| 2633 "Start region must be a member of the collection set."); | |
| 2634 HeapRegion* cur = r; | |
| 2635 while (cur != NULL) { | |
| 2636 HeapRegion* next = cur->next_in_collection_set(); | |
| 2637 if (cl->doHeapRegion(cur) && false) { | |
| 2638 cl->incomplete(); | |
| 2639 return; | |
| 2640 } | |
| 2641 cur = next; | |
| 2642 } | |
| 2643 cur = g1_policy()->collection_set(); | |
| 2644 while (cur != r) { | |
| 2645 HeapRegion* next = cur->next_in_collection_set(); | |
| 2646 if (cl->doHeapRegion(cur) && false) { | |
| 2647 cl->incomplete(); | |
| 2648 return; | |
| 2649 } | |
| 2650 cur = next; | |
| 2651 } | |
| 2652 } | |
| 2653 | |
| 2654 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
| 3766 | 2655 return n_regions() > 0 ? region_at(0) : NULL; |
| 342 | 2656 } |
| 2657 | |
| 2658 | |
| 2659 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
| 2660 Space* res = heap_region_containing(addr); | |
| 2661 if (res == NULL) | |
| 2662 res = perm_gen()->space_containing(addr); | |
| 2663 return res; | |
| 2664 } | |
| 2665 | |
| 2666 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
| 2667 Space* sp = space_containing(addr); | |
| 2668 if (sp != NULL) { | |
| 2669 return sp->block_start(addr); | |
| 2670 } | |
| 2671 return NULL; | |
| 2672 } | |
| 2673 | |
| 2674 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
| 2675 Space* sp = space_containing(addr); | |
| 2676 assert(sp != NULL, "block_size of address outside of heap"); | |
| 2677 return sp->block_size(addr); | |
| 2678 } | |
| 2679 | |
| 2680 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
| 2681 Space* sp = space_containing(addr); | |
| 2682 return sp->block_is_obj(addr); | |
| 2683 } | |
| 2684 | |
| 2685 bool G1CollectedHeap::supports_tlab_allocation() const { | |
| 2686 return true; | |
| 2687 } | |
| 2688 | |
| 2689 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
| 2690 return HeapRegion::GrainBytes; | |
| 2691 } | |
| 2692 | |
| 2693 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
| 2694 // Return the remaining space in the cur alloc region, but not less than | |
| 2695 // the min TLAB size. | |
|
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2696 |
|
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2697 // Also, this value can be at most the humongous object threshold, |
|
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2698 // since we can't allow tlabs to grow big enough to accomodate |
|
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2699 // humongous objects. |
|
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2700 |
|
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|
2701 HeapRegion* hr = _mutator_alloc_region.get(); |
|
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2702 size_t max_tlab_size = _humongous_object_threshold_in_words * wordSize; |
|
2433
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|
2703 if (hr == NULL) { |
|
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2704 return max_tlab_size; |
| 342 | 2705 } else { |
|
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|
2706 return MIN2(MAX2(hr->free(), (size_t) MinTLABSize), max_tlab_size); |
| 342 | 2707 } |
| 2708 } | |
| 2709 | |
| 2710 size_t G1CollectedHeap::max_capacity() const { | |
|
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|
2711 return _g1_reserved.byte_size(); |
| 342 | 2712 } |
| 2713 | |
| 2714 jlong G1CollectedHeap::millis_since_last_gc() { | |
| 2715 // assert(false, "NYI"); | |
| 2716 return 0; | |
| 2717 } | |
| 2718 | |
| 2719 void G1CollectedHeap::prepare_for_verify() { | |
| 2720 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
| 2721 ensure_parsability(false); | |
| 2722 } | |
| 2723 g1_rem_set()->prepare_for_verify(); | |
| 2724 } | |
| 2725 | |
| 2726 class VerifyLivenessOopClosure: public OopClosure { | |
|
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2727 G1CollectedHeap* _g1h; |
|
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2728 VerifyOption _vo; |
| 342 | 2729 public: |
|
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2730 VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo): |
|
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2731 _g1h(g1h), _vo(vo) |
|
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2732 { } |
|
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2733 void do_oop(narrowOop *p) { do_oop_work(p); } |
|
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2734 void do_oop( oop *p) { do_oop_work(p); } |
|
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2735 |
|
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2736 template <class T> void do_oop_work(T *p) { |
|
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2737 oop obj = oopDesc::load_decode_heap_oop(p); |
|
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2738 guarantee(obj == NULL || !_g1h->is_obj_dead_cond(obj, _vo), |
|
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|
2739 "Dead object referenced by a not dead object"); |
| 342 | 2740 } |
| 2741 }; | |
| 2742 | |
| 2743 class VerifyObjsInRegionClosure: public ObjectClosure { | |
| 811 | 2744 private: |
| 342 | 2745 G1CollectedHeap* _g1h; |
| 2746 size_t _live_bytes; | |
| 2747 HeapRegion *_hr; | |
|
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|
2748 VerifyOption _vo; |
| 342 | 2749 public: |
|
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|
2750 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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2751 // _vo == UseNextMarking -> use "next" marking information, |
|
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2752 // _vo == UseMarkWord -> use mark word from object header. |
|
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|
2753 VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo) |
|
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|
2754 : _live_bytes(0), _hr(hr), _vo(vo) { |
| 342 | 2755 _g1h = G1CollectedHeap::heap(); |
| 2756 } | |
| 2757 void do_object(oop o) { | |
|
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|
2758 VerifyLivenessOopClosure isLive(_g1h, _vo); |
| 342 | 2759 assert(o != NULL, "Huh?"); |
|
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2760 if (!_g1h->is_obj_dead_cond(o, _vo)) { |
|
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|
2761 // If the object is alive according to the mark word, |
|
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|
2762 // then verify that the marking information agrees. |
|
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|
2763 // Note we can't verify the contra-positive of the |
|
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|
2764 // above: if the object is dead (according to the mark |
|
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|
2765 // word), it may not be marked, or may have been marked |
|
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|
2766 // but has since became dead, or may have been allocated |
|
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|
2767 // since the last marking. |
|
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|
2768 if (_vo == VerifyOption_G1UseMarkWord) { |
|
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|
2769 guarantee(!_g1h->is_obj_dead(o), "mark word and concurrent mark mismatch"); |
|
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|
2770 } |
|
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|
2771 |
| 342 | 2772 o->oop_iterate(&isLive); |
|
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|
2773 if (!_hr->obj_allocated_since_prev_marking(o)) { |
|
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|
2774 size_t obj_size = o->size(); // Make sure we don't overflow |
|
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|
2775 _live_bytes += (obj_size * HeapWordSize); |
|
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|
2776 } |
| 342 | 2777 } |
| 2778 } | |
| 2779 size_t live_bytes() { return _live_bytes; } | |
| 2780 }; | |
| 2781 | |
| 2782 class PrintObjsInRegionClosure : public ObjectClosure { | |
| 2783 HeapRegion *_hr; | |
| 2784 G1CollectedHeap *_g1; | |
| 2785 public: | |
| 2786 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
| 2787 _g1 = G1CollectedHeap::heap(); | |
| 2788 }; | |
| 2789 | |
| 2790 void do_object(oop o) { | |
| 2791 if (o != NULL) { | |
| 2792 HeapWord *start = (HeapWord *) o; | |
| 2793 size_t word_sz = o->size(); | |
| 2794 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
| 2795 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
| 2796 (void*) o, word_sz, | |
| 2797 _g1->isMarkedPrev(o), | |
| 2798 _g1->isMarkedNext(o), | |
| 2799 _hr->obj_allocated_since_prev_marking(o)); | |
| 2800 HeapWord *end = start + word_sz; | |
| 2801 HeapWord *cur; | |
| 2802 int *val; | |
| 2803 for (cur = start; cur < end; cur++) { | |
| 2804 val = (int *) cur; | |
| 2805 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
| 2806 } | |
| 2807 } | |
| 2808 } | |
| 2809 }; | |
| 2810 | |
| 2811 class VerifyRegionClosure: public HeapRegionClosure { | |
| 811 | 2812 private: |
|
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|
2813 bool _allow_dirty; |
|
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|
2814 bool _par; |
|
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|
2815 VerifyOption _vo; |
|
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|
2816 bool _failures; |
| 811 | 2817 public: |
|
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2818 // _vo == UsePrevMarking -> use "prev" marking information, |
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2819 // _vo == UseNextMarking -> use "next" marking information, |
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2820 // _vo == UseMarkWord -> use mark word from object header. |
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2821 VerifyRegionClosure(bool allow_dirty, bool par, VerifyOption vo) |
|
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2822 : _allow_dirty(allow_dirty), |
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2823 _par(par), |
|
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2824 _vo(vo), |
|
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|
2825 _failures(false) {} |
|
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|
2826 |
|
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|
2827 bool failures() { |
|
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2828 return _failures; |
|
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|
2829 } |
|
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2830 |
| 342 | 2831 bool doHeapRegion(HeapRegion* r) { |
| 390 | 2832 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
| 2833 "Should be unclaimed at verify points."); | |
|
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2834 if (!r->continuesHumongous()) { |
|
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|
2835 bool failures = false; |
|
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|
2836 r->verify(_allow_dirty, _vo, &failures); |
|
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|
2837 if (failures) { |
|
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|
2838 _failures = true; |
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|
2839 } else { |
|
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|
2840 VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo); |
|
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|
2841 r->object_iterate(¬_dead_yet_cl); |
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2842 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
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|
2843 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
|
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|
2844 "max_live_bytes "SIZE_FORMAT" " |
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|
2845 "< calculated "SIZE_FORMAT, |
|
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|
2846 r->bottom(), r->end(), |
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|
2847 r->max_live_bytes(), |
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|
2848 not_dead_yet_cl.live_bytes()); |
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|
2849 _failures = true; |
|
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|
2850 } |
|
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|
2851 } |
| 342 | 2852 } |
|
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|
2853 return false; // stop the region iteration if we hit a failure |
| 342 | 2854 } |
| 2855 }; | |
| 2856 | |
| 2857 class VerifyRootsClosure: public OopsInGenClosure { | |
| 2858 private: | |
| 2859 G1CollectedHeap* _g1h; | |
|
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|
2860 VerifyOption _vo; |
| 342 | 2861 bool _failures; |
| 2862 public: | |
|
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|
2863 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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|
2864 // _vo == UseNextMarking -> use "next" marking information, |
|
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|
2865 // _vo == UseMarkWord -> use mark word from object header. |
|
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|
2866 VerifyRootsClosure(VerifyOption vo) : |
|
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|
2867 _g1h(G1CollectedHeap::heap()), |
|
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|
2868 _vo(vo), |
|
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|
2869 _failures(false) { } |
| 342 | 2870 |
| 2871 bool failures() { return _failures; } | |
| 2872 | |
|
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|
2873 template <class T> void do_oop_nv(T* p) { |
|
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|
2874 T heap_oop = oopDesc::load_heap_oop(p); |
|
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|
2875 if (!oopDesc::is_null(heap_oop)) { |
|
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|
2876 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
|
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|
2877 if (_g1h->is_obj_dead_cond(obj, _vo)) { |
| 342 | 2878 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
|
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|
2879 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
|
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|
2880 if (_vo == VerifyOption_G1UseMarkWord) { |
|
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|
2881 gclog_or_tty->print_cr(" Mark word: "PTR_FORMAT, (void*)(obj->mark())); |
|
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|
2882 } |
| 342 | 2883 obj->print_on(gclog_or_tty); |
| 2884 _failures = true; | |
| 2885 } | |
| 2886 } | |
| 2887 } | |
|
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|
2888 |
|
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|
2889 void do_oop(oop* p) { do_oop_nv(p); } |
|
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|
2890 void do_oop(narrowOop* p) { do_oop_nv(p); } |
| 342 | 2891 }; |
| 2892 | |
| 390 | 2893 // This is the task used for parallel heap verification. |
| 2894 | |
| 2895 class G1ParVerifyTask: public AbstractGangTask { | |
| 2896 private: | |
| 2897 G1CollectedHeap* _g1h; | |
|
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|
2898 bool _allow_dirty; |
|
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|
2899 VerifyOption _vo; |
|
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|
2900 bool _failures; |
| 390 | 2901 |
| 2902 public: | |
|
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|
2903 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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|
2904 // _vo == UseNextMarking -> use "next" marking information, |
|
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|
2905 // _vo == UseMarkWord -> use mark word from object header. |
|
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|
2906 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, VerifyOption vo) : |
| 390 | 2907 AbstractGangTask("Parallel verify task"), |
|
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|
2908 _g1h(g1h), |
|
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|
2909 _allow_dirty(allow_dirty), |
|
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|
2910 _vo(vo), |
|
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|
2911 _failures(false) { } |
|
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|
2912 |
|
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|
2913 bool failures() { |
|
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|
2914 return _failures; |
|
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|
2915 } |
| 390 | 2916 |
| 2917 void work(int worker_i) { | |
|
637
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|
2918 HandleMark hm; |
|
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|
2919 VerifyRegionClosure blk(_allow_dirty, true, _vo); |
| 390 | 2920 _g1h->heap_region_par_iterate_chunked(&blk, worker_i, |
| 2921 HeapRegion::ParVerifyClaimValue); | |
|
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|
2922 if (blk.failures()) { |
|
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|
2923 _failures = true; |
|
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|
2924 } |
| 390 | 2925 } |
| 2926 }; | |
| 2927 | |
| 342 | 2928 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
|
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|
2929 verify(allow_dirty, silent, VerifyOption_G1UsePrevMarking); |
| 811 | 2930 } |
| 2931 | |
| 2932 void G1CollectedHeap::verify(bool allow_dirty, | |
| 2933 bool silent, | |
|
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|
2934 VerifyOption vo) { |
| 342 | 2935 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
|
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|
2936 if (!silent) { gclog_or_tty->print("Roots (excluding permgen) "); } |
|
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|
2937 VerifyRootsClosure rootsCl(vo); |
|
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|
2938 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
|
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|
2939 |
|
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|
2940 // We apply the relevant closures to all the oops in the |
|
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|
2941 // system dictionary, the string table and the code cache. |
|
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|
2942 const int so = SharedHeap::SO_AllClasses | SharedHeap::SO_Strings | SharedHeap::SO_CodeCache; |
|
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|
2943 |
|
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|
2944 process_strong_roots(true, // activate StrongRootsScope |
|
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|
2945 true, // we set "collecting perm gen" to true, |
|
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|
2946 // so we don't reset the dirty cards in the perm gen. |
|
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|
2947 SharedHeap::ScanningOption(so), // roots scanning options |
| 342 | 2948 &rootsCl, |
|
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|
2949 &blobsCl, |
| 342 | 2950 &rootsCl); |
|
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|
2951 |
|
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|
2952 // If we're verifying after the marking phase of a Full GC then we can't |
|
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|
2953 // treat the perm gen as roots into the G1 heap. Some of the objects in |
|
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|
2954 // the perm gen may be dead and hence not marked. If one of these dead |
|
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|
2955 // objects is considered to be a root then we may end up with a false |
|
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|
2956 // "Root location <x> points to dead ob <y>" failure. |
|
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|
2957 if (vo != VerifyOption_G1UseMarkWord) { |
|
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|
2958 // Since we used "collecting_perm_gen" == true above, we will not have |
|
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|
2959 // checked the refs from perm into the G1-collected heap. We check those |
|
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|
2960 // references explicitly below. Whether the relevant cards are dirty |
|
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|
2961 // is checked further below in the rem set verification. |
|
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|
2962 if (!silent) { gclog_or_tty->print("Permgen roots "); } |
|
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|
2963 perm_gen()->oop_iterate(&rootsCl); |
|
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|
2964 } |
|
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|
2965 bool failures = rootsCl.failures(); |
|
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|
2966 |
|
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|
2967 if (vo != VerifyOption_G1UseMarkWord) { |
|
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|
2968 // If we're verifying during a full GC then the region sets |
|
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|
2969 // will have been torn down at the start of the GC. Therefore |
|
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changeset
|
2970 // verifying the region sets will fail. So we only verify |
|
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changeset
|
2971 // the region sets when not in a full GC. |
|
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7004681: G1: Extend marking verification to Full GCs
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parents:
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diff
changeset
|
2972 if (!silent) { gclog_or_tty->print("HeapRegionSets "); } |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2973 verify_region_sets(); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
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diff
changeset
|
2974 } |
|
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|
2975 |
| 2152 | 2976 if (!silent) { gclog_or_tty->print("HeapRegions "); } |
| 390 | 2977 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
| 2978 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2979 "sanity check"); | |
| 2980 | |
|
3772
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|
2981 G1ParVerifyTask task(this, allow_dirty, vo); |
| 390 | 2982 int n_workers = workers()->total_workers(); |
| 2983 set_par_threads(n_workers); | |
| 2984 workers()->run_task(&task); | |
| 2985 set_par_threads(0); | |
|
1020
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diff
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|
2986 if (task.failures()) { |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
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diff
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|
2987 failures = true; |
|
ff2402f6a50b
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|
2988 } |
| 390 | 2989 |
| 2990 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), | |
| 2991 "sanity check"); | |
| 2992 | |
| 2993 reset_heap_region_claim_values(); | |
| 2994 | |
| 2995 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2996 "sanity check"); | |
| 2997 } else { | |
|
3772
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|
2998 VerifyRegionClosure blk(allow_dirty, false, vo); |
| 3766 | 2999 heap_region_iterate(&blk); |
|
1020
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|
3000 if (blk.failures()) { |
|
ff2402f6a50b
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parents:
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|
3001 failures = true; |
|
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|
3002 } |
| 390 | 3003 } |
| 2152 | 3004 if (!silent) gclog_or_tty->print("RemSet "); |
| 342 | 3005 rem_set()->verify(); |
|
1020
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|
3006 |
|
ff2402f6a50b
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|
3007 if (failures) { |
|
ff2402f6a50b
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|
3008 gclog_or_tty->print_cr("Heap:"); |
|
4073
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|
3009 // It helps to have the per-region information in the output to |
|
53074c2c4600
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|
3010 // help us track down what went wrong. This is why we call |
|
53074c2c4600
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|
3011 // print_extended_on() instead of print_on(). |
|
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|
3012 print_extended_on(gclog_or_tty); |
|
1020
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|
3013 gclog_or_tty->print_cr(""); |
|
1547
fb1a39993f69
6951319: enable solaris builds using Sun Studio 12 update 1
jcoomes
parents:
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diff
changeset
|
3014 #ifndef PRODUCT |
| 1044 | 3015 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
| 1388 | 3016 concurrent_mark()->print_reachable("at-verification-failure", |
|
3772
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|
3017 vo, false /* all */); |
|
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|
3018 } |
|
1547
fb1a39993f69
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jcoomes
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|
3019 #endif |
|
1020
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|
3020 gclog_or_tty->flush(); |
|
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|
3021 } |
|
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|
3022 guarantee(!failures, "there should not have been any failures"); |
| 342 | 3023 } else { |
| 3024 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
| 3025 } | |
| 3026 } | |
| 3027 | |
| 3028 class PrintRegionClosure: public HeapRegionClosure { | |
| 3029 outputStream* _st; | |
| 3030 public: | |
| 3031 PrintRegionClosure(outputStream* st) : _st(st) {} | |
| 3032 bool doHeapRegion(HeapRegion* r) { | |
| 3033 r->print_on(_st); | |
| 3034 return false; | |
| 3035 } | |
| 3036 }; | |
| 3037 | |
| 3038 void G1CollectedHeap::print_on(outputStream* st) const { | |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
3039 st->print(" %-20s", "garbage-first heap"); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
3040 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
|
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
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diff
changeset
|
3041 capacity()/K, used_unlocked()/K); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
3042 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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changeset
|
3043 _g1_storage.low_boundary(), |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
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diff
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|
3044 _g1_storage.high(), |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
changeset
|
3045 _g1_storage.high_boundary()); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
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diff
changeset
|
3046 st->cr(); |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3983
diff
changeset
|
3047 st->print(" region size " SIZE_FORMAT "K, ", HeapRegion::GrainBytes / K); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
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diff
changeset
|
3048 size_t young_regions = _young_list->length(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
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changeset
|
3049 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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changeset
|
3050 young_regions, young_regions * HeapRegion::GrainBytes / K); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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changeset
|
3051 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
changeset
|
3052 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3053 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
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diff
changeset
|
3054 st->cr(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
changeset
|
3055 perm()->as_gen()->print_on(st); |
|
4073
53074c2c4600
7099849: G1: include heap region information in hs_err files
tonyp
parents:
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changeset
|
3056 } |
|
53074c2c4600
7099849: G1: include heap region information in hs_err files
tonyp
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changeset
|
3057 |
|
53074c2c4600
7099849: G1: include heap region information in hs_err files
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changeset
|
3058 void G1CollectedHeap::print_extended_on(outputStream* st) const { |
|
53074c2c4600
7099849: G1: include heap region information in hs_err files
tonyp
parents:
4072
diff
changeset
|
3059 print_on(st); |
|
53074c2c4600
7099849: G1: include heap region information in hs_err files
tonyp
parents:
4072
diff
changeset
|
3060 |
|
53074c2c4600
7099849: G1: include heap region information in hs_err files
tonyp
parents:
4072
diff
changeset
|
3061 // Print the per-region information. |
|
53074c2c4600
7099849: G1: include heap region information in hs_err files
tonyp
parents:
4072
diff
changeset
|
3062 st->cr(); |
|
53074c2c4600
7099849: G1: include heap region information in hs_err files
tonyp
parents:
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diff
changeset
|
3063 st->print_cr("Heap Regions: (Y=young(eden), SU=young(survivor), HS=humongous(starts), HC=humongous(continues), CS=collection set, F=free, TS=gc time stamp, PTAMS=previous top-at-mark-start, NTAMS=next top-at-mark-start)"); |
| 342 | 3064 PrintRegionClosure blk(st); |
| 3766 | 3065 heap_region_iterate(&blk); |
| 342 | 3066 } |
| 3067 | |
| 3068 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
3069 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 1019 | 3070 workers()->print_worker_threads_on(st); |
| 3071 } | |
| 3072 _cmThread->print_on(st); | |
| 342 | 3073 st->cr(); |
| 1019 | 3074 _cm->print_worker_threads_on(st); |
| 3075 _cg1r->print_worker_threads_on(st); | |
| 342 | 3076 st->cr(); |
| 3077 } | |
| 3078 | |
| 3079 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
3080 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3081 workers()->threads_do(tc); |
| 3082 } | |
| 3083 tc->do_thread(_cmThread); | |
| 794 | 3084 _cg1r->threads_do(tc); |
| 342 | 3085 } |
| 3086 | |
| 3087 void G1CollectedHeap::print_tracing_info() const { | |
| 3088 // We'll overload this to mean "trace GC pause statistics." | |
| 3089 if (TraceGen0Time || TraceGen1Time) { | |
| 3090 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
| 3091 // to that. | |
| 3092 g1_policy()->print_tracing_info(); | |
| 3093 } | |
| 751 | 3094 if (G1SummarizeRSetStats) { |
| 342 | 3095 g1_rem_set()->print_summary_info(); |
| 3096 } | |
| 1282 | 3097 if (G1SummarizeConcMark) { |
| 342 | 3098 concurrent_mark()->print_summary_info(); |
| 3099 } | |
| 3100 g1_policy()->print_yg_surv_rate_info(); | |
| 3101 SpecializationStats::print(); | |
| 3102 } | |
| 3103 | |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3104 #ifndef PRODUCT |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3105 // Helpful for debugging RSet issues. |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3106 |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3107 class PrintRSetsClosure : public HeapRegionClosure { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3108 private: |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3109 const char* _msg; |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3110 size_t _occupied_sum; |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3111 |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3112 public: |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3113 bool doHeapRegion(HeapRegion* r) { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3114 HeapRegionRemSet* hrrs = r->rem_set(); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3115 size_t occupied = hrrs->occupied(); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3116 _occupied_sum += occupied; |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3117 |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3118 gclog_or_tty->print_cr("Printing RSet for region "HR_FORMAT, |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3119 HR_FORMAT_PARAMS(r)); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3120 if (occupied == 0) { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3121 gclog_or_tty->print_cr(" RSet is empty"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3122 } else { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3123 hrrs->print(); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3124 } |
|
e8b0b0392037
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parents:
3774
diff
changeset
|
3125 gclog_or_tty->print_cr("----------"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3126 return false; |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3127 } |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3128 |
|
e8b0b0392037
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parents:
3774
diff
changeset
|
3129 PrintRSetsClosure(const char* msg) : _msg(msg), _occupied_sum(0) { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3130 gclog_or_tty->cr(); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
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3774
diff
changeset
|
3131 gclog_or_tty->print_cr("========================================"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3132 gclog_or_tty->print_cr(msg); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3133 gclog_or_tty->cr(); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3134 } |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3135 |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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parents:
3774
diff
changeset
|
3136 ~PrintRSetsClosure() { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3137 gclog_or_tty->print_cr("Occupied Sum: "SIZE_FORMAT, _occupied_sum); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3138 gclog_or_tty->print_cr("========================================"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3139 gclog_or_tty->cr(); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3140 } |
|
e8b0b0392037
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tonyp
parents:
3774
diff
changeset
|
3141 }; |
|
e8b0b0392037
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parents:
3774
diff
changeset
|
3142 |
|
e8b0b0392037
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parents:
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diff
changeset
|
3143 void G1CollectedHeap::print_cset_rsets() { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3144 PrintRSetsClosure cl("Printing CSet RSets"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3145 collection_set_iterate(&cl); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3146 } |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3147 |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3148 void G1CollectedHeap::print_all_rsets() { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3149 PrintRSetsClosure cl("Printing All RSets");; |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3150 heap_region_iterate(&cl); |
|
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|
3151 } |
|
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|
3152 #endif // PRODUCT |
|
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|
3153 |
| 342 | 3154 G1CollectedHeap* G1CollectedHeap::heap() { |
| 3155 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
| 3156 "not a garbage-first heap"); | |
| 3157 return _g1h; | |
| 3158 } | |
| 3159 | |
| 3160 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
|
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|
3161 // always_do_update_barrier = false; |
| 342 | 3162 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
| 3163 // Call allocation profiler | |
| 3164 AllocationProfiler::iterate_since_last_gc(); | |
| 3165 // Fill TLAB's and such | |
| 3166 ensure_parsability(true); | |
| 3167 } | |
| 3168 | |
| 3169 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
| 3170 // FIXME: what is this about? | |
| 3171 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
| 3172 // is set. | |
| 3173 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
| 3174 "derived pointer present")); | |
|
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|
3175 // always_do_update_barrier = true; |
|
3979
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|
3176 |
|
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|
3177 // We have just completed a GC. Update the soft reference |
|
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|
3178 // policy with the new heap occupancy |
|
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|
3179 Universe::update_heap_info_at_gc(); |
| 342 | 3180 } |
| 3181 | |
| 1973 | 3182 HeapWord* G1CollectedHeap::do_collection_pause(size_t word_size, |
| 3183 unsigned int gc_count_before, | |
| 3184 bool* succeeded) { | |
| 3185 assert_heap_not_locked_and_not_at_safepoint(); | |
| 342 | 3186 g1_policy()->record_stop_world_start(); |
| 1973 | 3187 VM_G1IncCollectionPause op(gc_count_before, |
| 3188 word_size, | |
| 3189 false, /* should_initiate_conc_mark */ | |
| 3190 g1_policy()->max_pause_time_ms(), | |
| 3191 GCCause::_g1_inc_collection_pause); | |
| 3192 VMThread::execute(&op); | |
| 3193 | |
| 3194 HeapWord* result = op.result(); | |
| 3195 bool ret_succeeded = op.prologue_succeeded() && op.pause_succeeded(); | |
| 3196 assert(result == NULL || ret_succeeded, | |
| 3197 "the result should be NULL if the VM did not succeed"); | |
| 3198 *succeeded = ret_succeeded; | |
| 3199 | |
| 3200 assert_heap_not_locked(); | |
| 3201 return result; | |
| 342 | 3202 } |
| 3203 | |
| 3204 void | |
| 3205 G1CollectedHeap::doConcurrentMark() { | |
|
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3206 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
|
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|
3207 if (!_cmThread->in_progress()) { |
|
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|
3208 _cmThread->set_started(); |
|
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|
3209 CGC_lock->notify(); |
| 342 | 3210 } |
| 3211 } | |
| 3212 | |
| 3213 // <NEW PREDICTION> | |
| 3214 | |
| 3215 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
| 3216 bool young) { | |
| 3217 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
| 3218 } | |
| 3219 | |
| 3220 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
| 3221 predicted_time_ms) { | |
| 3222 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
| 3223 } | |
| 3224 | |
| 3225 size_t G1CollectedHeap::pending_card_num() { | |
| 3226 size_t extra_cards = 0; | |
| 3227 JavaThread *curr = Threads::first(); | |
| 3228 while (curr != NULL) { | |
| 3229 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
| 3230 extra_cards += dcq.size(); | |
| 3231 curr = curr->next(); | |
| 3232 } | |
| 3233 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 3234 size_t buffer_size = dcqs.buffer_size(); | |
| 3235 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 3236 return buffer_size * buffer_num + extra_cards; | |
| 3237 } | |
| 3238 | |
| 3239 size_t G1CollectedHeap::max_pending_card_num() { | |
| 3240 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 3241 size_t buffer_size = dcqs.buffer_size(); | |
| 3242 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 3243 int thread_num = Threads::number_of_threads(); | |
| 3244 return (buffer_num + thread_num) * buffer_size; | |
| 3245 } | |
| 3246 | |
| 3247 size_t G1CollectedHeap::cards_scanned() { | |
| 1861 | 3248 return g1_rem_set()->cardsScanned(); |
| 342 | 3249 } |
| 3250 | |
| 3251 void | |
| 3252 G1CollectedHeap::setup_surviving_young_words() { | |
| 3253 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
| 3254 size_t array_length = g1_policy()->young_cset_length(); | |
| 3255 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); | |
| 3256 if (_surviving_young_words == NULL) { | |
| 3257 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
| 3258 "Not enough space for young surv words summary."); | |
| 3259 } | |
| 3260 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
|
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|
3261 #ifdef ASSERT |
| 342 | 3262 for (size_t i = 0; i < array_length; ++i) { |
|
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|
3263 assert( _surviving_young_words[i] == 0, "memset above" ); |
|
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|
3264 } |
|
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|
3265 #endif // !ASSERT |
| 342 | 3266 } |
| 3267 | |
| 3268 void | |
| 3269 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
| 3270 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 3271 size_t array_length = g1_policy()->young_cset_length(); | |
| 3272 for (size_t i = 0; i < array_length; ++i) | |
| 3273 _surviving_young_words[i] += surv_young_words[i]; | |
| 3274 } | |
| 3275 | |
| 3276 void | |
| 3277 G1CollectedHeap::cleanup_surviving_young_words() { | |
| 3278 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
| 3279 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
| 3280 _surviving_young_words = NULL; | |
| 3281 } | |
| 3282 | |
| 3283 // </NEW PREDICTION> | |
| 3284 | |
|
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|
3285 #ifdef ASSERT |
|
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|
3286 class VerifyCSetClosure: public HeapRegionClosure { |
|
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|
3287 public: |
|
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|
3288 bool doHeapRegion(HeapRegion* hr) { |
|
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|
3289 // Here we check that the CSet region's RSet is ready for parallel |
|
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|
3290 // iteration. The fields that we'll verify are only manipulated |
|
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|
3291 // when the region is part of a CSet and is collected. Afterwards, |
|
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|
3292 // we reset these fields when we clear the region's RSet (when the |
|
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|
3293 // region is freed) so they are ready when the region is |
|
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|
3294 // re-allocated. The only exception to this is if there's an |
|
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|
3295 // evacuation failure and instead of freeing the region we leave |
|
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|
3296 // it in the heap. In that case, we reset these fields during |
|
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|
3297 // evacuation failure handling. |
|
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|
3298 guarantee(hr->rem_set()->verify_ready_for_par_iteration(), "verification"); |
|
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|
3299 |
|
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|
3300 // Here's a good place to add any other checks we'd like to |
|
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|
3301 // perform on CSet regions. |
|
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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diff
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|
3302 return false; |
|
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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|
3303 } |
|
0414c1049f15
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|
3304 }; |
|
3777
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|
3305 #endif // ASSERT |
|
1261
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|
3306 |
| 1709 | 3307 #if TASKQUEUE_STATS |
| 3308 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
| 3309 st->print_raw_cr("GC Task Stats"); | |
| 3310 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
| 3311 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
| 3312 } | |
| 3313 | |
| 3314 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
| 3315 print_taskqueue_stats_hdr(st); | |
| 3316 | |
| 3317 TaskQueueStats totals; | |
|
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3318 const int n = workers() != NULL ? workers()->total_workers() : 1; |
| 1709 | 3319 for (int i = 0; i < n; ++i) { |
| 3320 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
| 3321 totals += task_queue(i)->stats; | |
| 3322 } | |
| 3323 st->print_raw("tot "); totals.print(st); st->cr(); | |
| 3324 | |
| 3325 DEBUG_ONLY(totals.verify()); | |
| 3326 } | |
| 3327 | |
| 3328 void G1CollectedHeap::reset_taskqueue_stats() { | |
|
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
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1719
diff
changeset
|
3329 const int n = workers() != NULL ? workers()->total_workers() : 1; |
| 1709 | 3330 for (int i = 0; i < n; ++i) { |
| 3331 task_queue(i)->stats.reset(); | |
| 3332 } | |
| 3333 } | |
| 3334 #endif // TASKQUEUE_STATS | |
| 3335 | |
| 1973 | 3336 bool |
|
1656
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6944166: G1: explicit GCs are not always handled correctly
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|
3337 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
| 2152 | 3338 assert_at_safepoint(true /* should_be_vm_thread */); |
| 3339 guarantee(!is_gc_active(), "collection is not reentrant"); | |
| 3340 | |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3341 if (GC_locker::check_active_before_gc()) { |
| 1973 | 3342 return false; |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
3343 } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
3344 |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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2039
diff
changeset
|
3345 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
|
2039
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
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changeset
|
3346 ResourceMark rm; |
|
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
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|
3347 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3348 if (PrintHeapAtGC) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3349 Universe::print_heap_before_gc(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3350 } |
|
0316eac49d5a
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|
3351 |
| 4072 | 3352 HRSPhaseSetter x(HRSPhaseEvacuation); |
| 2152 | 3353 verify_region_sets_optional(); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
changeset
|
3354 verify_dirty_young_regions(); |
| 2152 | 3355 |
|
838
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|
3356 { |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
3357 // This call will decide whether this pause is an initial-mark |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
3358 // pause. If it is, during_initial_mark_pause() will return true |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
3359 // for the duration of this pause. |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
3360 g1_policy()->decide_on_conc_mark_initiation(); |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
3361 |
|
3982
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
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diff
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|
3362 // We do not allow initial-mark to be piggy-backed on a |
|
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
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|
3363 // partially-young GC. |
|
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
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|
3364 assert(!g1_policy()->during_initial_mark_pause() || |
|
273b46400613
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|
3365 g1_policy()->full_young_gcs(), "sanity"); |
|
273b46400613
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|
3366 |
|
273b46400613
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|
3367 // We also do not allow partially-young GCs during marking. |
|
273b46400613
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|
3368 assert(!mark_in_progress() || g1_policy()->full_young_gcs(), "sanity"); |
|
273b46400613
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|
3369 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3370 char verbose_str[128]; |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3371 sprintf(verbose_str, "GC pause "); |
|
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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3830
diff
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|
3372 if (g1_policy()->full_young_gcs()) { |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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diff
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|
3373 strcat(verbose_str, "(young)"); |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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3830
diff
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|
3374 } else { |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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diff
changeset
|
3375 strcat(verbose_str, "(partial)"); |
|
838
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6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3376 } |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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|
3377 if (g1_policy()->during_initial_mark_pause()) { |
|
838
0316eac49d5a
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|
3378 strcat(verbose_str, " (initial-mark)"); |
|
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changeset
|
3379 // 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
|
3380 // full collection counter. |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3381 increment_total_full_collections(); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3382 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3383 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3384 // 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
|
3385 // 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
|
3386 // is messy if we do. |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3387 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3388 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3389 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
|
3390 |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3391 TraceCollectorStats tcs(g1mm()->incremental_collection_counters()); |
|
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
3392 TraceMemoryManagerStats tms(false /* fullGC */, gc_cause()); |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3393 |
| 2361 | 3394 // If the secondary_free_list is not empty, append it to the |
| 3395 // free_list. No need to wait for the cleanup operation to finish; | |
| 3396 // the region allocation code will check the secondary_free_list | |
| 3397 // and wait if necessary. If the G1StressConcRegionFreeing flag is | |
| 3398 // set, skip this step so that the region allocation code has to | |
| 3399 // get entries from the secondary_free_list. | |
| 2152 | 3400 if (!G1StressConcRegionFreeing) { |
| 2361 | 3401 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 3402 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3403 |
|
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3404 assert(check_young_list_well_formed(), |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3405 "young list should be well formed"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3406 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3407 { // 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
|
3408 IsGCActiveMark x; |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3409 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3410 gc_prologue(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3411 increment_total_collections(false /* full gc */); |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3412 increment_gc_time_stamp(); |
| 342 | 3413 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3414 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3415 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
|
3416 gclog_or_tty->print(" VerifyBeforeGC:"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3417 prepare_for_verify(); |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3418 Universe::verify(/* allow dirty */ false, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3419 /* silent */ false, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3420 /* option */ VerifyOption_G1UsePrevMarking); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3421 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3422 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3423 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3424 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3425 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3426 // Please see comment in g1CollectedHeap.hpp and |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3427 // G1CollectedHeap::ref_processing_init() to see how |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3428 // reference processing currently works in G1. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3429 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3430 // Enable discovery in the STW reference processor |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3431 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3432 true /*verify_no_refs*/); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3433 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3434 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3435 // We want to temporarily turn off discovery by the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3436 // CM ref processor, if necessary, and turn it back on |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3437 // on again later if we do. Using a scoped |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3438 // NoRefDiscovery object will do this. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3439 NoRefDiscovery no_cm_discovery(ref_processor_cm()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3440 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3441 // Forget the current alloc region (we might even choose it to be part |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3442 // of the collection set!). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3443 release_mutator_alloc_region(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3444 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3445 // We should call this after we retire the mutator alloc |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3446 // region(s) so that all the ALLOC / RETIRE events are generated |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3447 // before the start GC event. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3448 _hr_printer.start_gc(false /* full */, (size_t) total_collections()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3449 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3450 // The elapsed time induced by the start time below deliberately elides |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3451 // the possible verification above. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3452 double start_time_sec = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3453 size_t start_used_bytes = used(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3454 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3455 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3456 gclog_or_tty->print_cr("\nBefore recording pause start.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3457 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3458 g1_policy()->print_collection_set(g1_policy()->inc_cset_head(), gclog_or_tty); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3459 #endif // YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3460 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3461 g1_policy()->record_collection_pause_start(start_time_sec, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3462 start_used_bytes); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3463 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3464 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3465 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3466 _young_list->print(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3467 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3468 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3469 if (g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3470 concurrent_mark()->checkpointRootsInitialPre(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3471 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3472 perm_gen()->save_marks(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3473 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3474 // We must do this before any possible evacuation that should propagate |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3475 // marks. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3476 if (mark_in_progress()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3477 double start_time_sec = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3478 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3479 _cm->drainAllSATBBuffers(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3480 double finish_mark_ms = (os::elapsedTime() - start_time_sec) * 1000.0; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3481 g1_policy()->record_satb_drain_time(finish_mark_ms); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3482 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3483 // Record the number of elements currently on the mark stack, so we |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3484 // only iterate over these. (Since evacuation may add to the mark |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3485 // stack, doing more exposes race conditions.) If no mark is in |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3486 // progress, this will be zero. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3487 _cm->set_oops_do_bound(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3488 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3489 if (mark_in_progress()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3490 concurrent_mark()->newCSet(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3491 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3492 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3493 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3494 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3495 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3496 g1_policy()->print_collection_set(g1_policy()->inc_cset_head(), gclog_or_tty); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3497 #endif // YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3498 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3499 g1_policy()->choose_collection_set(target_pause_time_ms); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3500 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3501 if (_hr_printer.is_active()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3502 HeapRegion* hr = g1_policy()->collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3503 while (hr != NULL) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3504 G1HRPrinter::RegionType type; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3505 if (!hr->is_young()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3506 type = G1HRPrinter::Old; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3507 } else if (hr->is_survivor()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3508 type = G1HRPrinter::Survivor; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3509 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3510 type = G1HRPrinter::Eden; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3511 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3512 _hr_printer.cset(hr); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3513 hr = hr->next_in_collection_set(); |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3514 } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3515 } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3516 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3517 // We have chosen the complete collection set. If marking is |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3518 // active then, we clear the region fields of any of the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3519 // concurrent marking tasks whose region fields point into |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3520 // the collection set as these values will become stale. This |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3521 // will cause the owning marking threads to claim a new region |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3522 // when marking restarts. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3523 if (mark_in_progress()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3524 concurrent_mark()->reset_active_task_region_fields_in_cset(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3525 } |
|
3378
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3526 |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3527 #ifdef ASSERT |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3528 VerifyCSetClosure cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3529 collection_set_iterate(&cl); |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3530 #endif // ASSERT |
| 1707 | 3531 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3532 setup_surviving_young_words(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3533 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3534 // Initialize the GC alloc regions. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3535 init_gc_alloc_regions(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3536 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3537 // Actually do the work... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3538 evacuate_collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3539 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3540 free_collection_set(g1_policy()->collection_set()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3541 g1_policy()->clear_collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3542 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3543 cleanup_surviving_young_words(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3544 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3545 // Start a new incremental collection set for the next pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3546 g1_policy()->start_incremental_cset_building(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3547 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3548 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3549 // regions to the incremental collection set for the next |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3550 // evacuation pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3551 clear_cset_fast_test(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3552 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3553 _young_list->reset_sampled_info(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3554 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3555 // Don't check the whole heap at this point as the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3556 // GC alloc regions from this pause have been tagged |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3557 // as survivors and moved on to the survivor list. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3558 // Survivor regions will fail the !is_young() check. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3559 assert(check_young_list_empty(false /* check_heap */), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3560 "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
|
3561 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3562 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3563 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3564 _young_list->print(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3565 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3566 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3567 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3568 _young_list->first_survivor_region(), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3569 _young_list->last_survivor_region()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3570 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3571 _young_list->reset_auxilary_lists(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3572 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3573 if (evacuation_failed()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3574 _summary_bytes_used = recalculate_used(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3575 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3576 // The "used" of the the collection set have already been subtracted |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3577 // when they were freed. Add in the bytes evacuated. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3578 _summary_bytes_used += g1_policy()->bytes_copied_during_gc(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3579 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3580 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3581 if (g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3582 concurrent_mark()->checkpointRootsInitialPost(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3583 set_marking_started(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3584 // CAUTION: after the doConcurrentMark() call below, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3585 // the concurrent marking thread(s) could be running |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3586 // concurrently with us. Make sure that anything after |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3587 // this point does not assume that we are the only GC thread |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3588 // running. Note: of course, the actual marking work will |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3589 // not start until the safepoint itself is released in |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3590 // ConcurrentGCThread::safepoint_desynchronize(). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3591 doConcurrentMark(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3592 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3593 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3594 allocate_dummy_regions(); |
|
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
3595 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3596 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3597 gclog_or_tty->print_cr("\nEnd of the pause.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3598 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3599 g1_policy()->print_collection_set(g1_policy()->inc_cset_head(), gclog_or_tty); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3600 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3601 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3602 init_mutator_alloc_region(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3603 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3604 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3605 size_t expand_bytes = g1_policy()->expansion_amount(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3606 if (expand_bytes > 0) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3607 size_t bytes_before = capacity(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3608 if (!expand(expand_bytes)) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3609 // We failed to expand the heap so let's verify that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3610 // committed/uncommitted amount match the backing store |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3611 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3612 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3613 } |
|
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3614 } |
|
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3615 } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3616 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3617 double end_time_sec = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3618 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3619 g1_policy()->record_pause_time_ms(pause_time_ms); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3620 g1_policy()->record_collection_pause_end(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3621 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3622 MemoryService::track_memory_usage(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3623 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3624 // In prepare_for_verify() below we'll need to scan the deferred |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3625 // update buffers to bring the RSets up-to-date if |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3626 // G1HRRSFlushLogBuffersOnVerify has been set. While scanning |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3627 // the update buffers we'll probably need to scan cards on the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3628 // regions we just allocated to (i.e., the GC alloc |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3629 // regions). However, during the last GC we called |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3630 // set_saved_mark() on all the GC alloc regions, so card |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3631 // scanning might skip the [saved_mark_word()...top()] area of |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3632 // those regions (i.e., the area we allocated objects into |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3633 // during the last GC). But it shouldn't. Given that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3634 // saved_mark_word() is conditional on whether the GC time stamp |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3635 // on the region is current or not, by incrementing the GC time |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3636 // stamp here we invalidate all the GC time stamps on all the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3637 // regions and saved_mark_word() will simply return top() for |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3638 // all the regions. This is a nicer way of ensuring this rather |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3639 // than iterating over the regions and fixing them. In fact, the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3640 // GC time stamp increment here also ensures that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3641 // saved_mark_word() will return top() between pauses, i.e., |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3642 // during concurrent refinement. So we don't need the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3643 // is_gc_active() check to decided which top to use when |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3644 // scanning cards (see CR 7039627). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3645 increment_gc_time_stamp(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3646 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3647 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3648 HandleMark hm; // Discard invalid handles created during verification |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3649 gclog_or_tty->print(" VerifyAfterGC:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3650 prepare_for_verify(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3651 Universe::verify(/* allow dirty */ true, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3652 /* silent */ false, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3653 /* option */ VerifyOption_G1UsePrevMarking); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3654 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3655 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3656 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3657 ref_processor_stw()->verify_no_references_recorded(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3658 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3659 // CM reference discovery will be re-enabled if necessary. |
|
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3660 } |
|
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3661 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3662 { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3663 size_t expand_bytes = g1_policy()->expansion_amount(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3664 if (expand_bytes > 0) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3665 size_t bytes_before = capacity(); |
|
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3886
diff
changeset
|
3666 // No need for an ergo verbose message here, |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3886
diff
changeset
|
3667 // expansion_amount() does this when it returns a value > 0. |
|
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3668 if (!expand(expand_bytes)) { |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3669 // 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
|
3670 // committed/uncommitted amount match the backing store |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3671 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3672 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
|
3673 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3674 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3675 } |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3676 |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3677 // 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
|
3678 // 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
|
3679 // 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
|
3680 // RETIRE events are generated before the end GC event. |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3681 _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
|
3682 |
|
3764
053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
tonyp
parents:
3378
diff
changeset
|
3683 // 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
|
3684 g1_policy()->print_heap_transition(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3685 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3686 if (mark_in_progress()) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3687 concurrent_mark()->update_g1_committed(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3688 } |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3689 |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3690 #ifdef TRACESPINNING |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3691 ParallelTaskTerminator::print_termination_counts(); |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3692 #endif |
| 342 | 3693 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3694 gc_epilogue(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3695 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3696 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3697 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3698 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
|
3699 print_tracing_info(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3700 vm_exit(-1); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3701 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3702 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3703 |
| 3766 | 3704 _hrs.verify_optional(); |
| 2152 | 3705 verify_region_sets_optional(); |
| 3706 | |
| 1709 | 3707 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
| 3708 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); | |
| 3709 | |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3710 if (PrintHeapAtGC) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3711 Universe::print_heap_after_gc(); |
| 342 | 3712 } |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
3713 g1mm()->update_sizes(); |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3714 |
|
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3715 if (G1SummarizeRSetStats && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3716 (G1SummarizeRSetStatsPeriod > 0) && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3717 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3718 g1_rem_set()->print_summary_info(); |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3719 } |
| 1973 | 3720 |
| 3721 return true; | |
| 342 | 3722 } |
| 3723 | |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3724 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3725 { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3726 size_t gclab_word_size; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3727 switch (purpose) { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3728 case GCAllocForSurvived: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3729 gclab_word_size = YoungPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3730 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3731 case GCAllocForTenured: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3732 gclab_word_size = OldPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3733 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3734 default: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3735 assert(false, "unknown GCAllocPurpose"); |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3736 gclab_word_size = OldPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3737 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3738 } |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3739 return gclab_word_size; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3740 } |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3741 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3742 void G1CollectedHeap::init_mutator_alloc_region() { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3743 assert(_mutator_alloc_region.get() == NULL, "pre-condition"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3744 _mutator_alloc_region.init(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3745 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3746 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3747 void G1CollectedHeap::release_mutator_alloc_region() { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3748 _mutator_alloc_region.release(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3749 assert(_mutator_alloc_region.get() == NULL, "post-condition"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3750 } |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3751 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3752 void G1CollectedHeap::init_gc_alloc_regions() { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3753 assert_at_safepoint(true /* should_be_vm_thread */); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3754 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3755 _survivor_gc_alloc_region.init(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3756 _old_gc_alloc_region.init(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3757 HeapRegion* retained_region = _retained_old_gc_alloc_region; |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3758 _retained_old_gc_alloc_region = NULL; |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3759 |
|
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|
3760 // We will discard the current GC alloc region if: |
|
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|
3761 // a) it's in the collection set (it can happen!), |
|
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|
3762 // b) it's already full (no point in using it), |
|
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|
3763 // c) it's empty (this means that it was emptied during |
|
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|
3764 // a cleanup and it should be on the free list now), or |
|
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|
3765 // d) it's humongous (this means that it was emptied |
|
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|
3766 // during a cleanup and was added to the free list, but |
|
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|
3767 // has been subseqently used to allocate a humongous |
|
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|
3768 // object that may be less than the region size). |
|
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|
3769 if (retained_region != NULL && |
|
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|
3770 !retained_region->in_collection_set() && |
|
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|
3771 !(retained_region->top() == retained_region->end()) && |
|
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|
3772 !retained_region->is_empty() && |
|
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|
3773 !retained_region->isHumongous()) { |
|
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|
3774 retained_region->set_saved_mark(); |
| 4072 | 3775 // The retained region was added to the old region set when it was |
| 3776 // retired. We have to remove it now, since we don't allow regions | |
| 3777 // we allocate to in the region sets. We'll re-add it later, when | |
| 3778 // it's retired again. | |
| 3779 _old_set.remove(retained_region); | |
|
3830
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|
3780 _old_gc_alloc_region.set(retained_region); |
|
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|
3781 _hr_printer.reuse(retained_region); |
| 342 | 3782 } |
| 3783 } | |
| 3784 | |
|
3830
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3785 void G1CollectedHeap::release_gc_alloc_regions() { |
|
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|
3786 _survivor_gc_alloc_region.release(); |
|
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|
3787 // If we have an old GC alloc region to release, we'll save it in |
|
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|
3788 // _retained_old_gc_alloc_region. If we don't |
|
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|
3789 // _retained_old_gc_alloc_region will become NULL. This is what we |
|
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|
3790 // want either way so no reason to check explicitly for either |
|
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|
3791 // condition. |
|
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|
3792 _retained_old_gc_alloc_region = _old_gc_alloc_region.release(); |
| 342 | 3793 } |
| 3794 | |
|
3830
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|
3795 void G1CollectedHeap::abandon_gc_alloc_regions() { |
|
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|
3796 assert(_survivor_gc_alloc_region.get() == NULL, "pre-condition"); |
|
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|
3797 assert(_old_gc_alloc_region.get() == NULL, "pre-condition"); |
|
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|
3798 _retained_old_gc_alloc_region = NULL; |
| 342 | 3799 } |
| 3800 | |
| 3801 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
| 3802 _drain_in_progress = false; | |
| 3803 set_evac_failure_closure(cl); | |
| 3804 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 3805 } | |
| 3806 | |
| 3807 void G1CollectedHeap::finalize_for_evac_failure() { | |
| 3808 assert(_evac_failure_scan_stack != NULL && | |
| 3809 _evac_failure_scan_stack->length() == 0, | |
| 3810 "Postcondition"); | |
| 3811 assert(!_drain_in_progress, "Postcondition"); | |
| 1045 | 3812 delete _evac_failure_scan_stack; |
| 342 | 3813 _evac_failure_scan_stack = NULL; |
| 3814 } | |
| 3815 | |
|
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|
3816 class UpdateRSetDeferred : public OopsInHeapRegionClosure { |
|
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|
3817 private: |
|
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|
3818 G1CollectedHeap* _g1; |
|
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|
3819 DirtyCardQueue *_dcq; |
|
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|
3820 CardTableModRefBS* _ct_bs; |
|
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|
3821 |
|
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|
3822 public: |
|
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|
3823 UpdateRSetDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
|
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|
3824 _g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) {} |
|
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|
3825 |
|
845
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diff
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|
3826 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
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|
3827 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
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|
3828 template <class T> void do_oop_work(T* p) { |
|
616
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|
3829 assert(_from->is_in_reserved(p), "paranoia"); |
|
845
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parents:
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diff
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|
3830 if (!_from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && |
|
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diff
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|
3831 !_from->is_survivor()) { |
|
616
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|
3832 size_t card_index = _ct_bs->index_for(p); |
|
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|
3833 if (_ct_bs->mark_card_deferred(card_index)) { |
|
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|
3834 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
|
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|
3835 } |
|
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|
3836 } |
|
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|
3837 } |
|
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|
3838 }; |
|
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|
3839 |
| 342 | 3840 class RemoveSelfPointerClosure: public ObjectClosure { |
| 3841 private: | |
| 3842 G1CollectedHeap* _g1; | |
| 3843 ConcurrentMark* _cm; | |
| 3844 HeapRegion* _hr; | |
| 3845 size_t _prev_marked_bytes; | |
| 3846 size_t _next_marked_bytes; | |
|
616
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|
3847 OopsInHeapRegionClosure *_cl; |
| 342 | 3848 public: |
|
2133
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|
3849 RemoveSelfPointerClosure(G1CollectedHeap* g1, HeapRegion* hr, |
|
2250ee17e258
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|
3850 OopsInHeapRegionClosure* cl) : |
|
2250ee17e258
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tonyp
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2039
diff
changeset
|
3851 _g1(g1), _hr(hr), _cm(_g1->concurrent_mark()), _prev_marked_bytes(0), |
|
616
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|
3852 _next_marked_bytes(0), _cl(cl) {} |
| 342 | 3853 |
| 3854 size_t prev_marked_bytes() { return _prev_marked_bytes; } | |
| 3855 size_t next_marked_bytes() { return _next_marked_bytes; } | |
| 3856 | |
|
2133
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|
3857 // <original comment> |
|
352
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iveresov
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diff
changeset
|
3858 // The original idea here was to coalesce evacuated and dead objects. |
|
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|
3859 // However that caused complications with the block offset table (BOT). |
|
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|
3860 // In particular if there were two TLABs, one of them partially refined. |
|
e0c09f7ec5c4
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|
3861 // |----- TLAB_1--------|----TLAB_2-~~~(partially refined part)~~~| |
|
e0c09f7ec5c4
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|
3862 // The BOT entries of the unrefined part of TLAB_2 point to the start |
|
e0c09f7ec5c4
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|
3863 // of TLAB_2. If the last object of the TLAB_1 and the first object |
|
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|
3864 // of TLAB_2 are coalesced, then the cards of the unrefined part |
|
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diff
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|
3865 // would point into middle of the filler object. |
|
2133
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|
3866 // The current approach is to not coalesce and leave the BOT contents intact. |
|
2250ee17e258
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2039
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|
3867 // </original comment> |
|
352
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|
3868 // |
|
2133
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|
3869 // We now reset the BOT when we start the object iteration over the |
|
2250ee17e258
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tonyp
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2039
diff
changeset
|
3870 // region and refine its entries for every object we come across. So |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
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diff
changeset
|
3871 // the above comment is not really relevant and we should be able |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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2039
diff
changeset
|
3872 // to coalesce dead objects if we want to. |
|
352
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diff
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|
3873 void do_object(oop obj) { |
|
2133
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|
3874 HeapWord* obj_addr = (HeapWord*) obj; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3875 assert(_hr->is_in(obj_addr), "sanity"); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3876 size_t obj_size = obj->size(); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3877 _hr->update_bot_for_object(obj_addr, obj_size); |
|
352
e0c09f7ec5c4
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diff
changeset
|
3878 if (obj->is_forwarded() && obj->forwardee() == obj) { |
|
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
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|
3879 // The object failed to move. |
|
e0c09f7ec5c4
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|
3880 assert(!_g1->is_obj_dead(obj), "We should not be preserving dead objs."); |
|
e0c09f7ec5c4
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|
3881 _cm->markPrev(obj); |
|
e0c09f7ec5c4
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|
3882 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
|
2133
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|
3883 _prev_marked_bytes += (obj_size * HeapWordSize); |
|
352
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diff
changeset
|
3884 if (_g1->mark_in_progress() && !_g1->is_obj_ill(obj)) { |
|
e0c09f7ec5c4
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|
3885 _cm->markAndGrayObjectIfNecessary(obj); |
|
e0c09f7ec5c4
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|
3886 } |
|
e0c09f7ec5c4
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changeset
|
3887 obj->set_mark(markOopDesc::prototype()); |
|
e0c09f7ec5c4
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changeset
|
3888 // While we were processing RSet buffers during the |
|
e0c09f7ec5c4
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changeset
|
3889 // collection, we actually didn't scan any cards on the |
|
e0c09f7ec5c4
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|
3890 // collection set, since we didn't want to update remebered |
|
e0c09f7ec5c4
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changeset
|
3891 // sets with entries that point into the collection set, given |
|
e0c09f7ec5c4
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changeset
|
3892 // that live objects fromthe collection set are about to move |
|
e0c09f7ec5c4
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changeset
|
3893 // and such entries will be stale very soon. This change also |
|
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|
3894 // dealt with a reliability issue which involved scanning a |
|
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diff
changeset
|
3895 // card in the collection set and coming across an array that |
|
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diff
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|
3896 // was being chunked and looking malformed. The problem is |
|
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diff
changeset
|
3897 // that, if evacuation fails, we might have remembered set |
|
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parents:
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diff
changeset
|
3898 // entries missing given that we skipped cards on the |
|
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diff
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|
3899 // collection set. So, we'll recreate such entries now. |
|
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
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|
3900 obj->oop_iterate(_cl); |
|
352
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diff
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|
3901 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
|
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diff
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|
3902 } else { |
|
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diff
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|
3903 // The object has been either evacuated or is dead. Fill it with a |
|
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diff
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|
3904 // dummy object. |
|
2133
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|
3905 MemRegion mr((HeapWord*)obj, obj_size); |
|
481
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
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diff
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|
3906 CollectedHeap::fill_with_object(mr); |
| 342 | 3907 _cm->clearRangeBothMaps(mr); |
| 3908 } | |
| 3909 } | |
| 3910 }; | |
| 3911 | |
| 3912 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
| 1705 | 3913 UpdateRSetImmediate immediate_update(_g1h->g1_rem_set()); |
|
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
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|
3914 DirtyCardQueue dcq(&_g1h->dirty_card_queue_set()); |
|
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6720309: G1: don't synchronously update RSet during evacuation pauses
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|
3915 UpdateRSetDeferred deferred_update(_g1h, &dcq); |
|
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6720309: G1: don't synchronously update RSet during evacuation pauses
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|
3916 OopsInHeapRegionClosure *cl; |
|
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6720309: G1: don't synchronously update RSet during evacuation pauses
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|
3917 if (G1DeferredRSUpdate) { |
|
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6720309: G1: don't synchronously update RSet during evacuation pauses
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|
3918 cl = &deferred_update; |
|
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6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
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|
3919 } else { |
|
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6720309: G1: don't synchronously update RSet during evacuation pauses
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|
3920 cl = &immediate_update; |
|
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6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
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|
3921 } |
| 342 | 3922 HeapRegion* cur = g1_policy()->collection_set(); |
| 3923 while (cur != NULL) { | |
| 3924 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
|
2133
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|
3925 assert(!cur->isHumongous(), "sanity"); |
|
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7007068: G1: refine the BOT during evac failure handling
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|
3926 |
| 342 | 3927 if (cur->evacuation_failed()) { |
| 3928 assert(cur->in_collection_set(), "bad CS"); | |
|
2133
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|
3929 RemoveSelfPointerClosure rspc(_g1h, cur, cl); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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|
3930 |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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|
3931 // In the common case we make sure that this is done when the |
|
e8b0b0392037
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tonyp
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changeset
|
3932 // region is freed so that it is "ready-to-go" when it's |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
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diff
changeset
|
3933 // re-allocated. However, when evacuation failure happens, a |
|
e8b0b0392037
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tonyp
parents:
3774
diff
changeset
|
3934 // region will remain in the heap and might ultimately be added |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3935 // to a CSet in the future. So we have to be careful here and |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3936 // make sure the region's RSet is ready for parallel iteration |
|
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7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3937 // whenever this might be required in the future. |
|
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7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3938 cur->rem_set()->reset_for_par_iteration(); |
|
2133
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|
3939 cur->reset_bot(); |
|
616
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diff
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|
3940 cl->set_region(cur); |
| 342 | 3941 cur->object_iterate(&rspc); |
| 3942 | |
| 3943 // A number of manipulations to make the TAMS be the current top, | |
| 3944 // and the marked bytes be the ones observed in the iteration. | |
| 3945 if (_g1h->concurrent_mark()->at_least_one_mark_complete()) { | |
| 3946 // The comments below are the postconditions achieved by the | |
| 3947 // calls. Note especially the last such condition, which says that | |
| 3948 // the count of marked bytes has been properly restored. | |
| 3949 cur->note_start_of_marking(false); | |
| 3950 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
| 3951 cur->add_to_marked_bytes(rspc.prev_marked_bytes()); | |
| 3952 // _next_marked_bytes == prev_marked_bytes. | |
| 3953 cur->note_end_of_marking(); | |
| 3954 // _prev_top_at_mark_start == top(), | |
| 3955 // _prev_marked_bytes == prev_marked_bytes | |
| 3956 } | |
| 3957 // If there is no mark in progress, we modified the _next variables | |
| 3958 // above needlessly, but harmlessly. | |
| 3959 if (_g1h->mark_in_progress()) { | |
| 3960 cur->note_start_of_marking(false); | |
| 3961 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
| 3962 // _next_marked_bytes == next_marked_bytes. | |
| 3963 } | |
| 3964 } | |
| 3965 cur = cur->next_in_collection_set(); | |
| 3966 } | |
| 3967 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
| 3968 | |
| 3969 // Now restore saved marks, if any. | |
| 3970 if (_objs_with_preserved_marks != NULL) { | |
| 3971 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
| 3972 guarantee(_objs_with_preserved_marks->length() == | |
| 3973 _preserved_marks_of_objs->length(), "Both or none."); | |
| 3974 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
| 3975 oop obj = _objs_with_preserved_marks->at(i); | |
| 3976 markOop m = _preserved_marks_of_objs->at(i); | |
| 3977 obj->set_mark(m); | |
| 3978 } | |
| 3979 // Delete the preserved marks growable arrays (allocated on the C heap). | |
| 3980 delete _objs_with_preserved_marks; | |
| 3981 delete _preserved_marks_of_objs; | |
| 3982 _objs_with_preserved_marks = NULL; | |
| 3983 _preserved_marks_of_objs = NULL; | |
| 3984 } | |
| 3985 } | |
| 3986 | |
| 3987 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
| 3988 _evac_failure_scan_stack->push(obj); | |
| 3989 } | |
| 3990 | |
| 3991 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
| 3992 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
| 3993 | |
| 3994 while (_evac_failure_scan_stack->length() > 0) { | |
| 3995 oop obj = _evac_failure_scan_stack->pop(); | |
| 3996 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
| 3997 obj->oop_iterate_backwards(_evac_failure_closure); | |
| 3998 } | |
| 3999 } | |
| 4000 | |
| 4001 oop | |
| 4002 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
|
3973
663cb89032b1
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parents:
3920
diff
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|
4003 oop old, |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4004 bool should_mark_root) { |
|
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
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3317
diff
changeset
|
4005 assert(obj_in_cs(old), |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4006 err_msg("obj: "PTR_FORMAT" should still be in the CSet", |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4007 (HeapWord*) old)); |
| 342 | 4008 markOop m = old->mark(); |
| 4009 oop forward_ptr = old->forward_to_atomic(old); | |
| 4010 if (forward_ptr == NULL) { | |
| 4011 // Forward-to-self succeeded. | |
|
3973
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4012 |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4013 // should_mark_root will be true when this routine is called |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4014 // from a root scanning closure during an initial mark pause. |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4015 // In this case the thread that succeeds in self-forwarding the |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4016 // object is also responsible for marking the object. |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4017 if (should_mark_root) { |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4018 assert(!oopDesc::is_null(old), "shouldn't be"); |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4019 _cm->grayRoot(old); |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4020 } |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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parents:
3920
diff
changeset
|
4021 |
| 342 | 4022 if (_evac_failure_closure != cl) { |
| 4023 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
| 4024 assert(!_drain_in_progress, | |
| 4025 "Should only be true while someone holds the lock."); | |
| 4026 // Set the global evac-failure closure to the current thread's. | |
| 4027 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
| 4028 set_evac_failure_closure(cl); | |
| 4029 // Now do the common part. | |
| 4030 handle_evacuation_failure_common(old, m); | |
| 4031 // Reset to NULL. | |
| 4032 set_evac_failure_closure(NULL); | |
| 4033 } else { | |
| 4034 // The lock is already held, and this is recursive. | |
| 4035 assert(_drain_in_progress, "This should only be the recursive case."); | |
| 4036 handle_evacuation_failure_common(old, m); | |
| 4037 } | |
| 4038 return old; | |
| 4039 } else { | |
|
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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3317
diff
changeset
|
4040 // Forward-to-self failed. Either someone else managed to allocate |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4041 // space for this object (old != forward_ptr) or they beat us in |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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3317
diff
changeset
|
4042 // self-forwarding it (old == forward_ptr). |
|
75af3e8de182
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tonyp
parents:
3317
diff
changeset
|
4043 assert(old == forward_ptr || !obj_in_cs(forward_ptr), |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4044 err_msg("obj: "PTR_FORMAT" forwarded to: "PTR_FORMAT" " |
|
75af3e8de182
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3317
diff
changeset
|
4045 "should not be in the CSet", |
|
75af3e8de182
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3317
diff
changeset
|
4046 (HeapWord*) old, (HeapWord*) forward_ptr)); |
| 342 | 4047 return forward_ptr; |
| 4048 } | |
| 4049 } | |
| 4050 | |
| 4051 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
| 4052 set_evacuation_failed(true); | |
| 4053 | |
| 4054 preserve_mark_if_necessary(old, m); | |
| 4055 | |
| 4056 HeapRegion* r = heap_region_containing(old); | |
| 4057 if (!r->evacuation_failed()) { | |
| 4058 r->set_evacuation_failed(true); | |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
4059 _hr_printer.evac_failure(r); |
| 342 | 4060 } |
| 4061 | |
| 4062 push_on_evac_failure_scan_stack(old); | |
| 4063 | |
| 4064 if (!_drain_in_progress) { | |
| 4065 // prevent recursion in copy_to_survivor_space() | |
| 4066 _drain_in_progress = true; | |
| 4067 drain_evac_failure_scan_stack(); | |
| 4068 _drain_in_progress = false; | |
| 4069 } | |
| 4070 } | |
| 4071 | |
| 4072 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
|
2038
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4073 assert(evacuation_failed(), "Oversaving!"); |
|
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4074 // We want to call the "for_promotion_failure" version only in the |
|
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4075 // case of a promotion failure. |
|
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4076 if (m->must_be_preserved_for_promotion_failure(obj)) { |
| 342 | 4077 if (_objs_with_preserved_marks == NULL) { |
| 4078 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
| 4079 _objs_with_preserved_marks = | |
| 4080 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 4081 _preserved_marks_of_objs = | |
| 4082 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
| 4083 } | |
| 4084 _objs_with_preserved_marks->push(obj); | |
| 4085 _preserved_marks_of_objs->push(m); | |
| 4086 } | |
| 4087 } | |
| 4088 | |
| 4089 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
| 4090 size_t word_size) { | |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
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|
4091 if (purpose == GCAllocForSurvived) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
changeset
|
4092 HeapWord* result = survivor_attempt_allocation(word_size); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
changeset
|
4093 if (result != NULL) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
changeset
|
4094 return result; |
| 342 | 4095 } else { |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4096 // Let's try to allocate in the old gen in case we can fit the |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4097 // object there. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4098 return old_attempt_allocation(word_size); |
| 342 | 4099 } |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4100 } else { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4101 assert(purpose == GCAllocForTenured, "sanity"); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4102 HeapWord* result = old_attempt_allocation(word_size); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
changeset
|
4103 if (result != NULL) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
changeset
|
4104 return result; |
| 342 | 4105 } else { |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4106 // Let's try to allocate in the survivors in case we can fit the |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4107 // object there. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4108 return survivor_attempt_allocation(word_size); |
| 342 | 4109 } |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4110 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4111 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4112 ShouldNotReachHere(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4113 // Trying to keep some compilers happy. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4114 return NULL; |
| 342 | 4115 } |
| 4116 | |
| 4117 #ifndef PRODUCT | |
| 4118 bool GCLabBitMapClosure::do_bit(size_t offset) { | |
| 4119 HeapWord* addr = _bitmap->offsetToHeapWord(offset); | |
| 4120 guarantee(_cm->isMarked(oop(addr)), "it should be!"); | |
| 4121 return true; | |
| 4122 } | |
| 4123 #endif // PRODUCT | |
| 4124 | |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4125 G1ParGCAllocBuffer::G1ParGCAllocBuffer(size_t gclab_word_size) : |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4126 ParGCAllocBuffer(gclab_word_size), |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4127 _should_mark_objects(false), |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4128 _bitmap(G1CollectedHeap::heap()->reserved_region().start(), gclab_word_size), |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4129 _retired(false) |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4130 { |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
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diff
changeset
|
4131 //_should_mark_objects is set to true when G1ParCopyHelper needs to |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4132 // mark the forwarded location of an evacuated object. |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4133 // We set _should_mark_objects to true if marking is active, i.e. when we |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4134 // need to propagate a mark, or during an initial mark pause, i.e. when we |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4135 // need to mark objects immediately reachable by the roots. |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4136 if (G1CollectedHeap::heap()->mark_in_progress() || |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4137 G1CollectedHeap::heap()->g1_policy()->during_initial_mark_pause()) { |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4138 _should_mark_objects = true; |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4139 } |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4140 } |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4141 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4142 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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|
4143 : _g1h(g1h), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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diff
changeset
|
4144 _refs(g1h->task_queue(queue_num)), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4145 _dcq(&g1h->dirty_card_queue_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
4146 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4147 _g1_rem(g1h->g1_rem_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
4148 _hash_seed(17), _queue_num(queue_num), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4149 _term_attempts(0), |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4150 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
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diff
changeset
|
4151 _tenured_alloc_buffer(g1h->desired_plab_sz(GCAllocForTenured)), |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4152 _age_table(false), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4153 _strong_roots_time(0), _term_time(0), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4154 _alloc_buffer_waste(0), _undo_waste(0) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4155 { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4156 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4157 // we "sacrifice" entry 0 to keep track of surviving bytes for |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4158 // non-young regions (where the age is -1) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4159 // We also add a few elements at the beginning and at the end in |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4160 // an attempt to eliminate cache contention |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4161 size_t real_length = 1 + _g1h->g1_policy()->young_cset_length(); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4162 size_t array_length = PADDING_ELEM_NUM + |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4163 real_length + |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4164 PADDING_ELEM_NUM; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4165 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4166 if (_surviving_young_words_base == NULL) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4167 vm_exit_out_of_memory(array_length * sizeof(size_t), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4168 "Not enough space for young surv histo."); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4169 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4170 memset(_surviving_young_words, 0, real_length * sizeof(size_t)); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4171 |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4172 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4173 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4174 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4175 _start = os::elapsedTime(); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4176 } |
| 342 | 4177 |
| 1709 | 4178 void |
| 4179 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
| 4180 { | |
| 4181 st->print_raw_cr("GC Termination Stats"); | |
| 4182 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
| 4183 " ------waste (KiB)------"); | |
| 4184 st->print_raw_cr("thr ms ms % ms % attempts" | |
| 4185 " total alloc undo"); | |
| 4186 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
| 4187 " ------- ------- -------"); | |
| 4188 } | |
| 4189 | |
| 4190 void | |
| 4191 G1ParScanThreadState::print_termination_stats(int i, | |
| 4192 outputStream* const st) const | |
| 4193 { | |
| 4194 const double elapsed_ms = elapsed_time() * 1000.0; | |
| 4195 const double s_roots_ms = strong_roots_time() * 1000.0; | |
| 4196 const double term_ms = term_time() * 1000.0; | |
| 4197 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
| 4198 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
| 4199 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
| 4200 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
| 4201 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
| 4202 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
| 4203 alloc_buffer_waste() * HeapWordSize / K, | |
| 4204 undo_waste() * HeapWordSize / K); | |
| 4205 } | |
| 4206 | |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4207 #ifdef ASSERT |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4208 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4209 assert(ref != NULL, "invariant"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4210 assert(UseCompressedOops, "sanity"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4211 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4212 oop p = oopDesc::load_decode_heap_oop(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4213 assert(_g1h->is_in_g1_reserved(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4214 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4215 return true; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4216 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4217 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4218 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4219 assert(ref != NULL, "invariant"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4220 if (has_partial_array_mask(ref)) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4221 // Must be in the collection set--it's already been copied. |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4222 oop p = clear_partial_array_mask(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4223 assert(_g1h->obj_in_cs(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4224 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4225 } else { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4226 oop p = oopDesc::load_decode_heap_oop(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4227 assert(_g1h->is_in_g1_reserved(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4228 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4229 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4230 return true; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4231 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4232 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4233 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4234 if (ref.is_narrow()) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4235 return verify_ref((narrowOop*) ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4236 } else { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4237 return verify_ref((oop*) ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4238 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4239 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4240 #endif // ASSERT |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4241 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4242 void G1ParScanThreadState::trim_queue() { |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4243 assert(_evac_cl != NULL, "not set"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4244 assert(_evac_failure_cl != NULL, "not set"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4245 assert(_partial_scan_cl != NULL, "not set"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4246 |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4247 StarTask ref; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4248 do { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4249 // Drain the overflow stack first, so other threads can steal. |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4250 while (refs()->pop_overflow(ref)) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4251 deal_with_reference(ref); |
|
b14ec34b1e07
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4252 } |
|
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|
4253 |
|
1862
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4254 while (refs()->pop_local(ref)) { |
|
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4255 deal_with_reference(ref); |
|
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|
4256 } |
|
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4257 } while (!refs()->is_empty()); |
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|
4258 } |
|
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|
4259 |
| 342 | 4260 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : |
| 4261 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), | |
|
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|
4262 _par_scan_state(par_scan_state), |
|
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4263 _during_initial_mark(_g1->g1_policy()->during_initial_mark_pause()), |
|
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4264 _mark_in_progress(_g1->mark_in_progress()) { } |
|
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4265 |
|
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|
4266 template <class T> void G1ParCopyHelper::mark_object(T* p) { |
|
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4267 // This is called from do_oop_work for objects that are not |
|
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4268 // in the collection set. Objects in the collection set |
|
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4269 // are marked after they have been evacuated. |
| 342 | 4270 |
|
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4271 T heap_oop = oopDesc::load_heap_oop(p); |
|
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4272 if (!oopDesc::is_null(heap_oop)) { |
|
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4273 oop obj = oopDesc::decode_heap_oop(heap_oop); |
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4274 HeapWord* addr = (HeapWord*)obj; |
|
3323
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|
4275 if (_g1->is_in_g1_reserved(addr)) { |
| 342 | 4276 _cm->grayRoot(oop(addr)); |
|
3323
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|
4277 } |
| 342 | 4278 } |
| 4279 } | |
| 4280 | |
|
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|
4281 oop G1ParCopyHelper::copy_to_survivor_space(oop old, bool should_mark_root, |
|
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|
4282 bool should_mark_copy) { |
| 342 | 4283 size_t word_sz = old->size(); |
| 4284 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
| 4285 // +1 to make the -1 indexes valid... | |
| 4286 int young_index = from_region->young_index_in_cset()+1; | |
| 4287 assert( (from_region->is_young() && young_index > 0) || | |
| 4288 (!from_region->is_young() && young_index == 0), "invariant" ); | |
| 4289 G1CollectorPolicy* g1p = _g1->g1_policy(); | |
| 4290 markOop m = old->mark(); | |
| 545 | 4291 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
| 4292 : m->age(); | |
| 4293 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
| 342 | 4294 word_sz); |
| 4295 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
| 4296 oop obj = oop(obj_ptr); | |
| 4297 | |
| 4298 if (obj_ptr == NULL) { | |
| 4299 // This will either forward-to-self, or detect that someone else has | |
| 4300 // installed a forwarding pointer. | |
| 4301 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
|
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|
4302 return _g1->handle_evacuation_failure_par(cl, old, should_mark_root); |
| 342 | 4303 } |
| 4304 | |
| 526 | 4305 // We're going to allocate linearly, so might as well prefetch ahead. |
| 4306 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
| 4307 | |
| 342 | 4308 oop forward_ptr = old->forward_to_atomic(obj); |
| 4309 if (forward_ptr == NULL) { | |
| 4310 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
| 526 | 4311 if (g1p->track_object_age(alloc_purpose)) { |
| 4312 // We could simply do obj->incr_age(). However, this causes a | |
| 4313 // performance issue. obj->incr_age() will first check whether | |
| 4314 // the object has a displaced mark by checking its mark word; | |
| 4315 // getting the mark word from the new location of the object | |
| 4316 // stalls. So, given that we already have the mark word and we | |
| 4317 // are about to install it anyway, it's better to increase the | |
| 4318 // age on the mark word, when the object does not have a | |
| 4319 // displaced mark word. We're not expecting many objects to have | |
| 4320 // a displaced marked word, so that case is not optimized | |
| 4321 // further (it could be...) and we simply call obj->incr_age(). | |
| 4322 | |
| 4323 if (m->has_displaced_mark_helper()) { | |
| 4324 // in this case, we have to install the mark word first, | |
| 4325 // otherwise obj looks to be forwarded (the old mark word, | |
| 4326 // which contains the forward pointer, was copied) | |
| 4327 obj->set_mark(m); | |
| 4328 obj->incr_age(); | |
| 4329 } else { | |
| 4330 m = m->incr_age(); | |
| 545 | 4331 obj->set_mark(m); |
| 526 | 4332 } |
| 545 | 4333 _par_scan_state->age_table()->add(obj, word_sz); |
| 4334 } else { | |
| 4335 obj->set_mark(m); | |
| 526 | 4336 } |
| 4337 | |
|
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|
4338 // Mark the evacuated object or propagate "next" mark bit |
|
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|
4339 if (should_mark_copy) { |
| 342 | 4340 if (!use_local_bitmaps || |
| 4341 !_par_scan_state->alloc_buffer(alloc_purpose)->mark(obj_ptr)) { | |
| 4342 // if we couldn't mark it on the local bitmap (this happens when | |
| 4343 // the object was not allocated in the GCLab), we have to bite | |
| 4344 // the bullet and do the standard parallel mark | |
| 4345 _cm->markAndGrayObjectIfNecessary(obj); | |
| 4346 } | |
|
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|
4347 |
| 342 | 4348 if (_g1->isMarkedNext(old)) { |
|
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|
4349 // Unmark the object's old location so that marking |
|
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|
4350 // doesn't think the old object is alive. |
| 342 | 4351 _cm->nextMarkBitMap()->parClear((HeapWord*)old); |
| 4352 } | |
| 4353 } | |
| 4354 | |
| 4355 size_t* surv_young_words = _par_scan_state->surviving_young_words(); | |
| 4356 surv_young_words[young_index] += word_sz; | |
| 4357 | |
| 4358 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
| 4359 arrayOop(old)->set_length(0); | |
|
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|
4360 oop* old_p = set_partial_array_mask(old); |
|
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|
4361 _par_scan_state->push_on_queue(old_p); |
| 342 | 4362 } else { |
| 526 | 4363 // No point in using the slower heap_region_containing() method, |
| 4364 // given that we know obj is in the heap. | |
| 4365 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
| 342 | 4366 obj->oop_iterate_backwards(_scanner); |
| 4367 } | |
| 4368 } else { | |
| 4369 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
| 4370 obj = forward_ptr; | |
| 4371 } | |
| 4372 return obj; | |
| 4373 } | |
| 4374 | |
|
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|
4375 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
|
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|
4376 template <class T> |
|
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|
4377 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> |
|
845
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|
4378 ::do_oop_work(T* p) { |
|
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|
4379 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 4380 assert(barrier != G1BarrierRS || obj != NULL, |
| 4381 "Precondition: G1BarrierRS implies obj is nonNull"); | |
| 4382 | |
|
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|
4383 // Marking: |
|
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|
4384 // If the object is in the collection set, then the thread |
|
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|
4385 // that copies the object should mark, or propagate the |
|
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|
4386 // mark to, the evacuated object. |
|
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|
4387 // If the object is not in the collection set then we |
|
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|
4388 // should call the mark_object() method depending on the |
|
eeae91c9baba
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|
4389 // value of the template parameter do_mark_object (which will |
|
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|
4390 // be true for root scanning closures during an initial mark |
|
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|
4391 // pause). |
|
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|
4392 // The mark_object() method first checks whether the object |
|
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|
4393 // is marked and, if not, attempts to mark the object. |
|
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|
4394 |
| 526 | 4395 // here the null check is implicit in the cset_fast_test() test |
|
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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diff
changeset
|
4396 if (_g1->in_cset_fast_test(obj)) { |
| 526 | 4397 if (obj->is_forwarded()) { |
|
845
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|
4398 oopDesc::encode_store_heap_oop(p, obj->forwardee()); |
|
3886
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|
4399 // If we are a root scanning closure during an initial |
|
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|
4400 // mark pause (i.e. do_mark_object will be true) then |
|
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|
4401 // we also need to handle marking of roots in the |
|
eeae91c9baba
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|
4402 // event of an evacuation failure. In the event of an |
|
eeae91c9baba
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|
4403 // evacuation failure, the object is forwarded to itself |
|
3973
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|
4404 // and not copied. For root-scanning closures, the |
|
663cb89032b1
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|
4405 // object would be marked after a successful self-forward |
|
663cb89032b1
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|
4406 // but an object could be pointed to by both a root and non |
|
663cb89032b1
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|
4407 // root location and be self-forwarded by a non-root-scanning |
|
663cb89032b1
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|
4408 // closure. Therefore we also have to attempt to mark the |
|
663cb89032b1
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|
4409 // self-forwarded root object here. |
|
3886
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|
4410 if (do_mark_object && obj->forwardee() == obj) { |
|
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|
4411 mark_object(p); |
|
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|
4412 } |
| 526 | 4413 } else { |
|
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|
4414 // During an initial mark pause, objects that are pointed to |
|
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|
4415 // by the roots need to be marked - even in the event of an |
|
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|
4416 // evacuation failure. We pass the template parameter |
|
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|
4417 // do_mark_object (which is true for root scanning closures |
|
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|
4418 // during an initial mark pause) to copy_to_survivor_space |
|
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|
4419 // which will pass it on to the evacuation failure handling |
|
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|
4420 // code. The thread that successfully self-forwards a root |
|
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|
4421 // object to itself is responsible for marking the object. |
|
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|
4422 bool should_mark_root = do_mark_object; |
|
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|
4423 |
|
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|
4424 // We need to mark the copied object if we're a root scanning |
|
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|
4425 // closure during an initial mark pause (i.e. do_mark_object |
|
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|
4426 // will be true), or the object is already marked and we need |
|
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|
4427 // to propagate the mark to the evacuated copy. |
|
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|
4428 bool should_mark_copy = do_mark_object || |
|
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|
4429 _during_initial_mark || |
|
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|
4430 (_mark_in_progress && !_g1->is_obj_ill(obj)); |
|
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|
4431 |
|
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|
4432 oop copy_oop = copy_to_survivor_space(obj, should_mark_root, |
|
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|
4433 should_mark_copy); |
|
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|
4434 oopDesc::encode_store_heap_oop(p, copy_oop); |
| 342 | 4435 } |
| 526 | 4436 // When scanning the RS, we only care about objs in CS. |
| 4437 if (barrier == G1BarrierRS) { | |
|
616
4f360ec815ba
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|
4438 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 342 | 4439 } |
|
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|
4440 } else { |
|
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4441 // The object is not in collection set. If we're a root scanning |
|
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4442 // closure during an initial mark pause (i.e. do_mark_object will |
|
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|
4443 // be true) then attempt to mark the object. |
|
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|
4444 if (do_mark_object) { |
|
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4445 mark_object(p); |
|
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|
4446 } |
| 526 | 4447 } |
| 4448 | |
| 4449 if (barrier == G1BarrierEvac && obj != NULL) { | |
|
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|
4450 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 526 | 4451 } |
| 4452 | |
| 4453 if (do_gen_barrier && obj != NULL) { | |
| 4454 par_do_barrier(p); | |
| 4455 } | |
| 4456 } | |
| 4457 | |
|
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|
4458 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
|
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|
4459 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
|
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|
4460 |
|
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|
4461 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
| 526 | 4462 assert(has_partial_array_mask(p), "invariant"); |
| 4463 oop old = clear_partial_array_mask(p); | |
| 342 | 4464 assert(old->is_objArray(), "must be obj array"); |
| 4465 assert(old->is_forwarded(), "must be forwarded"); | |
| 4466 assert(Universe::heap()->is_in_reserved(old), "must be in heap."); | |
| 4467 | |
| 4468 objArrayOop obj = objArrayOop(old->forwardee()); | |
| 4469 assert((void*)old != (void*)old->forwardee(), "self forwarding here?"); | |
| 4470 // Process ParGCArrayScanChunk elements now | |
| 4471 // and push the remainder back onto queue | |
| 4472 int start = arrayOop(old)->length(); | |
| 4473 int end = obj->length(); | |
| 4474 int remainder = end - start; | |
| 4475 assert(start <= end, "just checking"); | |
| 4476 if (remainder > 2 * ParGCArrayScanChunk) { | |
| 4477 // Test above combines last partial chunk with a full chunk | |
| 4478 end = start + ParGCArrayScanChunk; | |
| 4479 arrayOop(old)->set_length(end); | |
| 4480 // Push remainder. | |
|
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|
4481 oop* old_p = set_partial_array_mask(old); |
|
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|
4482 assert(arrayOop(old)->length() < obj->length(), "Empty push?"); |
|
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|
4483 _par_scan_state->push_on_queue(old_p); |
| 342 | 4484 } else { |
| 4485 // Restore length so that the heap remains parsable in | |
| 4486 // case of evacuation failure. | |
| 4487 arrayOop(old)->set_length(end); | |
| 4488 } | |
|
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|
4489 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
| 342 | 4490 // process our set of indices (include header in first chunk) |
|
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|
4491 obj->oop_iterate_range(&_scanner, start, end); |
| 342 | 4492 } |
| 4493 | |
| 4494 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
| 4495 protected: | |
| 4496 G1CollectedHeap* _g1h; | |
| 4497 G1ParScanThreadState* _par_scan_state; | |
| 4498 RefToScanQueueSet* _queues; | |
| 4499 ParallelTaskTerminator* _terminator; | |
| 4500 | |
| 4501 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
| 4502 RefToScanQueueSet* queues() { return _queues; } | |
| 4503 ParallelTaskTerminator* terminator() { return _terminator; } | |
| 4504 | |
| 4505 public: | |
| 4506 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
| 4507 G1ParScanThreadState* par_scan_state, | |
| 4508 RefToScanQueueSet* queues, | |
| 4509 ParallelTaskTerminator* terminator) | |
| 4510 : _g1h(g1h), _par_scan_state(par_scan_state), | |
| 4511 _queues(queues), _terminator(terminator) {} | |
| 4512 | |
|
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4513 void do_void(); |
|
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4514 |
|
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|
4515 private: |
|
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|
4516 inline bool offer_termination(); |
|
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|
4517 }; |
|
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|
4518 |
|
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|
4519 bool G1ParEvacuateFollowersClosure::offer_termination() { |
|
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4520 G1ParScanThreadState* const pss = par_scan_state(); |
|
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4521 pss->start_term_time(); |
|
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4522 const bool res = terminator()->offer_termination(); |
|
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|
4523 pss->end_term_time(); |
|
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|
4524 return res; |
|
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|
4525 } |
|
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|
4526 |
|
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|
4527 void G1ParEvacuateFollowersClosure::do_void() { |
|
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|
4528 StarTask stolen_task; |
|
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|
4529 G1ParScanThreadState* const pss = par_scan_state(); |
|
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|
4530 pss->trim_queue(); |
|
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4531 |
|
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|
4532 do { |
|
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|
4533 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
|
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|
4534 assert(pss->verify_task(stolen_task), "sanity"); |
|
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|
4535 if (stolen_task.is_narrow()) { |
|
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|
4536 pss->deal_with_reference((narrowOop*) stolen_task); |
|
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|
4537 } else { |
|
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|
4538 pss->deal_with_reference((oop*) stolen_task); |
|
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|
4539 } |
|
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4540 |
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|
4541 // We've just processed a reference and we might have made |
|
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|
4542 // available new entries on the queues. So we have to make sure |
|
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|
4543 // we drain the queues as necessary. |
| 342 | 4544 pss->trim_queue(); |
| 4545 } | |
|
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|
4546 } while (!offer_termination()); |
|
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|
4547 |
|
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|
4548 pss->retire_alloc_buffers(); |
|
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|
4549 } |
| 342 | 4550 |
| 4551 class G1ParTask : public AbstractGangTask { | |
| 4552 protected: | |
| 4553 G1CollectedHeap* _g1h; | |
| 4554 RefToScanQueueSet *_queues; | |
| 4555 ParallelTaskTerminator _terminator; | |
|
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|
4556 int _n_workers; |
| 342 | 4557 |
| 4558 Mutex _stats_lock; | |
| 4559 Mutex* stats_lock() { return &_stats_lock; } | |
| 4560 | |
| 4561 size_t getNCards() { | |
| 4562 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
| 4563 / G1BlockOffsetSharedArray::N_bytes; | |
| 4564 } | |
| 4565 | |
| 4566 public: | |
| 4567 G1ParTask(G1CollectedHeap* g1h, int workers, RefToScanQueueSet *task_queues) | |
| 4568 : AbstractGangTask("G1 collection"), | |
| 4569 _g1h(g1h), | |
| 4570 _queues(task_queues), | |
| 4571 _terminator(workers, _queues), | |
|
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|
4572 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true), |
|
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|
4573 _n_workers(workers) |
| 342 | 4574 {} |
| 4575 | |
| 4576 RefToScanQueueSet* queues() { return _queues; } | |
| 4577 | |
| 4578 RefToScanQueue *work_queue(int i) { | |
| 4579 return queues()->queue(i); | |
| 4580 } | |
| 4581 | |
| 4582 void work(int i) { | |
|
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|
4583 if (i >= _n_workers) return; // no work needed this round |
| 1611 | 4584 |
| 4585 double start_time_ms = os::elapsedTime() * 1000.0; | |
| 4586 _g1h->g1_policy()->record_gc_worker_start_time(i, start_time_ms); | |
| 4587 | |
| 342 | 4588 ResourceMark rm; |
| 4589 HandleMark hm; | |
| 4590 | |
|
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|
4591 ReferenceProcessor* rp = _g1h->ref_processor_stw(); |
|
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|
4592 |
| 526 | 4593 G1ParScanThreadState pss(_g1h, i); |
|
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|
4594 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, rp); |
|
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|
4595 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, rp); |
|
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|
4596 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, rp); |
| 342 | 4597 |
| 4598 pss.set_evac_closure(&scan_evac_cl); | |
| 4599 pss.set_evac_failure_closure(&evac_failure_cl); | |
| 4600 pss.set_partial_scan_closure(&partial_scan_cl); | |
| 4601 | |
|
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|
4602 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss, rp); |
|
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|
4603 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss, rp); |
|
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|
4604 |
|
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|
4605 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss, rp); |
|
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|
4606 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss, rp); |
|
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|
4607 |
|
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|
4608 OopClosure* scan_root_cl = &only_scan_root_cl; |
|
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|
4609 OopsInHeapRegionClosure* scan_perm_cl = &only_scan_perm_cl; |
| 342 | 4610 |
|
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|
4611 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
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|
4612 // We also need to mark copied objects. |
| 342 | 4613 scan_root_cl = &scan_mark_root_cl; |
| 4614 scan_perm_cl = &scan_mark_perm_cl; | |
| 4615 } | |
| 4616 | |
|
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|
4617 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
|
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|
4618 |
| 342 | 4619 pss.start_strong_roots(); |
| 4620 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
| 4621 SharedHeap::SO_AllClasses, | |
| 4622 scan_root_cl, | |
|
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|
4623 &push_heap_rs_cl, |
| 342 | 4624 scan_perm_cl, |
| 4625 i); | |
| 4626 pss.end_strong_roots(); | |
|
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|
4627 |
| 342 | 4628 { |
| 4629 double start = os::elapsedTime(); | |
| 4630 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
| 4631 evac.do_void(); | |
| 4632 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
| 4633 double term_ms = pss.term_time()*1000.0; | |
| 4634 _g1h->g1_policy()->record_obj_copy_time(i, elapsed_ms-term_ms); | |
| 1611 | 4635 _g1h->g1_policy()->record_termination(i, term_ms, pss.term_attempts()); |
| 342 | 4636 } |
| 1282 | 4637 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
| 342 | 4638 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
| 4639 | |
| 4640 // Clean up any par-expanded rem sets. | |
| 4641 HeapRegionRemSet::par_cleanup(); | |
| 4642 | |
| 4643 if (ParallelGCVerbose) { | |
| 1709 | 4644 MutexLocker x(stats_lock()); |
| 4645 pss.print_termination_stats(i); | |
| 342 | 4646 } |
| 4647 | |
|
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|
4648 assert(pss.refs()->is_empty(), "should be empty"); |
| 1611 | 4649 double end_time_ms = os::elapsedTime() * 1000.0; |
| 4650 _g1h->g1_policy()->record_gc_worker_end_time(i, end_time_ms); | |
| 342 | 4651 } |
| 4652 }; | |
| 4653 | |
| 4654 // *** Common G1 Evacuation Stuff | |
| 4655 | |
|
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|
4656 // This method is run in a GC worker. |
|
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|
4657 |
| 342 | 4658 void |
| 4659 G1CollectedHeap:: | |
| 4660 g1_process_strong_roots(bool collecting_perm_gen, | |
| 4661 SharedHeap::ScanningOption so, | |
| 4662 OopClosure* scan_non_heap_roots, | |
| 4663 OopsInHeapRegionClosure* scan_rs, | |
| 4664 OopsInGenClosure* scan_perm, | |
| 4665 int worker_i) { | |
|
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|
4666 |
| 342 | 4667 // First scan the strong roots, including the perm gen. |
| 4668 double ext_roots_start = os::elapsedTime(); | |
| 4669 double closure_app_time_sec = 0.0; | |
| 4670 | |
| 4671 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
| 4672 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
| 4673 buf_scan_perm.set_generation(perm_gen()); | |
| 4674 | |
|
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|
4675 // Walk the code cache w/o buffering, because StarTask cannot handle |
|
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|
4676 // unaligned oop locations. |
|
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|
4677 CodeBlobToOopClosure eager_scan_code_roots(scan_non_heap_roots, /*do_marking=*/ true); |
|
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|
4678 |
|
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|
4679 process_strong_roots(false, // no scoping; this is parallel code |
|
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|
4680 collecting_perm_gen, so, |
| 342 | 4681 &buf_scan_non_heap_roots, |
|
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|
4682 &eager_scan_code_roots, |
| 342 | 4683 &buf_scan_perm); |
|
1394
1316cec51b4d
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|
4684 |
|
3979
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|
4685 // Now the CM ref_processor roots. |
|
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|
4686 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { |
|
3979
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|
4687 // We need to treat the discovered reference lists of the |
|
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|
4688 // concurrent mark ref processor as roots and keep entries |
|
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|
4689 // (which are added by the marking threads) on them live |
|
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|
4690 // until they can be processed at the end of marking. |
|
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|
4691 ref_processor_cm()->weak_oops_do(&buf_scan_non_heap_roots); |
|
3823
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|
4692 } |
|
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|
4693 |
|
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|
4694 // Finish up any enqueued closure apps (attributed as object copy time). |
| 342 | 4695 buf_scan_non_heap_roots.done(); |
| 4696 buf_scan_perm.done(); | |
|
3823
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|
4697 |
| 342 | 4698 double ext_roots_end = os::elapsedTime(); |
|
3823
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|
4699 |
| 342 | 4700 g1_policy()->reset_obj_copy_time(worker_i); |
|
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|
4701 double obj_copy_time_sec = buf_scan_perm.closure_app_seconds() + |
|
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|
4702 buf_scan_non_heap_roots.closure_app_seconds(); |
| 342 | 4703 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); |
|
3823
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|
4704 |
| 342 | 4705 double ext_root_time_ms = |
| 4706 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
|
3823
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|
4707 |
| 342 | 4708 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); |
| 4709 | |
| 4710 // Scan strong roots in mark stack. | |
| 4711 if (!_process_strong_tasks->is_task_claimed(G1H_PS_mark_stack_oops_do)) { | |
| 4712 concurrent_mark()->oops_do(scan_non_heap_roots); | |
| 4713 } | |
| 4714 double mark_stack_scan_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; | |
| 4715 g1_policy()->record_mark_stack_scan_time(worker_i, mark_stack_scan_ms); | |
| 4716 | |
| 4717 // Now scan the complement of the collection set. | |
| 4718 if (scan_rs != NULL) { | |
| 4719 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
| 4720 } | |
|
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|
4721 |
| 342 | 4722 _process_strong_tasks->all_tasks_completed(); |
| 4723 } | |
| 4724 | |
| 4725 void | |
| 4726 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
| 4727 OopClosure* non_root_closure) { | |
|
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|
4728 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
|
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|
4729 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
| 342 | 4730 } |
| 4731 | |
|
3979
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|
4732 // Weak Reference Processing support |
|
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|
4733 |
|
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|
4734 // An always "is_alive" closure that is used to preserve referents. |
|
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|
4735 // If the object is non-null then it's alive. Used in the preservation |
|
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|
4736 // of referent objects that are pointed to by reference objects |
|
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|
4737 // discovered by the CM ref processor. |
|
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changeset
|
4738 class G1AlwaysAliveClosure: public BoolObjectClosure { |
|
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|
4739 G1CollectedHeap* _g1; |
|
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|
4740 public: |
|
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|
4741 G1AlwaysAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
|
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|
4742 void do_object(oop p) { assert(false, "Do not call."); } |
|
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|
4743 bool do_object_b(oop p) { |
|
4dfb2df418f2
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changeset
|
4744 if (p != NULL) { |
|
4dfb2df418f2
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|
4745 return true; |
|
4dfb2df418f2
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changeset
|
4746 } |
|
4dfb2df418f2
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|
4747 return false; |
|
4dfb2df418f2
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changeset
|
4748 } |
|
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changeset
|
4749 }; |
|
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changeset
|
4750 |
|
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changeset
|
4751 bool G1STWIsAliveClosure::do_object_b(oop p) { |
|
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|
4752 // An object is reachable if it is outside the collection set, |
|
4dfb2df418f2
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|
4753 // or is inside and copied. |
|
4dfb2df418f2
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changeset
|
4754 return !_g1->obj_in_cs(p) || p->is_forwarded(); |
|
4dfb2df418f2
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changeset
|
4755 } |
|
4dfb2df418f2
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changeset
|
4756 |
|
4dfb2df418f2
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diff
changeset
|
4757 // Non Copying Keep Alive closure |
|
4dfb2df418f2
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changeset
|
4758 class G1KeepAliveClosure: public OopClosure { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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changeset
|
4759 G1CollectedHeap* _g1; |
|
4dfb2df418f2
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changeset
|
4760 public: |
|
4dfb2df418f2
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diff
changeset
|
4761 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
|
4dfb2df418f2
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parents:
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changeset
|
4762 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
|
4dfb2df418f2
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changeset
|
4763 void do_oop( oop* p) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4764 oop obj = *p; |
|
4dfb2df418f2
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diff
changeset
|
4765 |
|
4dfb2df418f2
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diff
changeset
|
4766 if (_g1->obj_in_cs(obj)) { |
|
4dfb2df418f2
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diff
changeset
|
4767 assert( obj->is_forwarded(), "invariant" ); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4768 *p = obj->forwardee(); |
|
4dfb2df418f2
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diff
changeset
|
4769 } |
|
4dfb2df418f2
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changeset
|
4770 } |
|
4dfb2df418f2
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changeset
|
4771 }; |
|
4dfb2df418f2
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diff
changeset
|
4772 |
|
4dfb2df418f2
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diff
changeset
|
4773 // Copying Keep Alive closure - can be called from both |
|
4dfb2df418f2
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diff
changeset
|
4774 // serial and parallel code as long as different worker |
|
4dfb2df418f2
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changeset
|
4775 // threads utilize different G1ParScanThreadState instances |
|
4dfb2df418f2
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diff
changeset
|
4776 // and different queues. |
|
4dfb2df418f2
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diff
changeset
|
4777 |
|
4dfb2df418f2
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diff
changeset
|
4778 class G1CopyingKeepAliveClosure: public OopClosure { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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changeset
|
4779 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
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changeset
|
4780 OopClosure* _copy_non_heap_obj_cl; |
|
4dfb2df418f2
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changeset
|
4781 OopsInHeapRegionClosure* _copy_perm_obj_cl; |
|
4dfb2df418f2
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changeset
|
4782 G1ParScanThreadState* _par_scan_state; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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changeset
|
4783 |
|
4dfb2df418f2
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changeset
|
4784 public: |
|
4dfb2df418f2
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diff
changeset
|
4785 G1CopyingKeepAliveClosure(G1CollectedHeap* g1h, |
|
4dfb2df418f2
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changeset
|
4786 OopClosure* non_heap_obj_cl, |
|
4dfb2df418f2
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changeset
|
4787 OopsInHeapRegionClosure* perm_obj_cl, |
|
4dfb2df418f2
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changeset
|
4788 G1ParScanThreadState* pss): |
|
4dfb2df418f2
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diff
changeset
|
4789 _g1h(g1h), |
|
4dfb2df418f2
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changeset
|
4790 _copy_non_heap_obj_cl(non_heap_obj_cl), |
|
4dfb2df418f2
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changeset
|
4791 _copy_perm_obj_cl(perm_obj_cl), |
|
4dfb2df418f2
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changeset
|
4792 _par_scan_state(pss) |
|
4dfb2df418f2
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changeset
|
4793 {} |
|
4dfb2df418f2
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changeset
|
4794 |
|
4dfb2df418f2
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changeset
|
4795 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
4dfb2df418f2
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changeset
|
4796 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
4dfb2df418f2
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|
4797 |
|
4dfb2df418f2
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diff
changeset
|
4798 template <class T> void do_oop_work(T* p) { |
|
4dfb2df418f2
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changeset
|
4799 oop obj = oopDesc::load_decode_heap_oop(p); |
|
4dfb2df418f2
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|
4800 |
|
4dfb2df418f2
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changeset
|
4801 if (_g1h->obj_in_cs(obj)) { |
|
4dfb2df418f2
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|
4802 // If the referent object has been forwarded (either copied |
|
4dfb2df418f2
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changeset
|
4803 // to a new location or to itself in the event of an |
|
4dfb2df418f2
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|
4804 // evacuation failure) then we need to update the reference |
|
4dfb2df418f2
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changeset
|
4805 // field and, if both reference and referent are in the G1 |
|
4dfb2df418f2
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changeset
|
4806 // heap, update the RSet for the referent. |
|
4dfb2df418f2
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changeset
|
4807 // |
|
4dfb2df418f2
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diff
changeset
|
4808 // If the referent has not been forwarded then we have to keep |
|
4dfb2df418f2
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changeset
|
4809 // it alive by policy. Therefore we have copy the referent. |
|
4dfb2df418f2
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changeset
|
4810 // |
|
4dfb2df418f2
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changeset
|
4811 // If the reference field is in the G1 heap then we can push |
|
4dfb2df418f2
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changeset
|
4812 // on the PSS queue. When the queue is drained (after each |
|
4dfb2df418f2
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changeset
|
4813 // phase of reference processing) the object and it's followers |
|
4dfb2df418f2
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changeset
|
4814 // will be copied, the reference field set to point to the |
|
4dfb2df418f2
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diff
changeset
|
4815 // new location, and the RSet updated. Otherwise we need to |
|
4dfb2df418f2
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3973
diff
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|
4816 // use the the non-heap or perm closures directly to copy |
|
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parents:
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diff
changeset
|
4817 // the refernt object and update the pointer, while avoiding |
|
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parents:
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diff
changeset
|
4818 // updating the RSet. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4819 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4820 if (_g1h->is_in_g1_reserved(p)) { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4821 _par_scan_state->push_on_queue(p); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4822 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4823 // The reference field is not in the G1 heap. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4824 if (_g1h->perm_gen()->is_in(p)) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4825 _copy_perm_obj_cl->do_oop(p); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4826 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4827 _copy_non_heap_obj_cl->do_oop(p); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4828 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4829 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4830 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4831 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4832 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4833 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4834 // Serial drain queue closure. Called as the 'complete_gc' |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4835 // closure for each discovered list in some of the |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4836 // reference processing phases. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4837 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4838 class G1STWDrainQueueClosure: public VoidClosure { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4839 protected: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4840 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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|
4841 G1ParScanThreadState* _par_scan_state; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4842 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4843 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } |
|
4dfb2df418f2
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parents:
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changeset
|
4844 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4845 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4846 G1STWDrainQueueClosure(G1CollectedHeap* g1h, G1ParScanThreadState* pss) : |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4847 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4848 _par_scan_state(pss) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
4849 { } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4850 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4851 void do_void() { |
|
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6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4852 G1ParScanThreadState* const pss = par_scan_state(); |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4853 pss->trim_queue(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4854 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4855 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4856 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4857 // Parallel Reference Processing closures |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4858 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4859 // Implementation of AbstractRefProcTaskExecutor for parallel reference |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4860 // processing during G1 evacuation pauses. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4861 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4862 class G1STWRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4863 private: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4864 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
4865 RefToScanQueueSet* _queues; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4866 WorkGang* _workers; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4867 int _active_workers; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4868 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4869 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4870 G1STWRefProcTaskExecutor(G1CollectedHeap* g1h, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4871 WorkGang* workers, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4872 RefToScanQueueSet *task_queues, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4873 int n_workers) : |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4874 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4875 _queues(task_queues), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4876 _workers(workers), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4877 _active_workers(n_workers) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4878 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4879 assert(n_workers > 0, "shouldn't call this otherwise"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4880 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4881 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4882 // Executes the given task using concurrent marking worker threads. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4883 virtual void execute(ProcessTask& task); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4884 virtual void execute(EnqueueTask& task); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4885 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4886 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4887 // Gang task for possibly parallel reference processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4888 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4889 class G1STWRefProcTaskProxy: public AbstractGangTask { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4890 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4891 ProcessTask& _proc_task; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4892 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4893 RefToScanQueueSet *_task_queues; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4894 ParallelTaskTerminator* _terminator; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4895 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4896 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4897 G1STWRefProcTaskProxy(ProcessTask& proc_task, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4898 G1CollectedHeap* g1h, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4899 RefToScanQueueSet *task_queues, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4900 ParallelTaskTerminator* terminator) : |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4901 AbstractGangTask("Process reference objects in parallel"), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4902 _proc_task(proc_task), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4903 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4904 _task_queues(task_queues), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4905 _terminator(terminator) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4906 {} |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4907 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4908 virtual void work(int i) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4909 // The reference processing task executed by a single worker. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4910 ResourceMark rm; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4911 HandleMark hm; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4912 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4913 G1STWIsAliveClosure is_alive(_g1h); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4914 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4915 G1ParScanThreadState pss(_g1h, i); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4916 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4917 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4918 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4919 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4920 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4921 pss.set_evac_closure(&scan_evac_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4922 pss.set_evac_failure_closure(&evac_failure_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4923 pss.set_partial_scan_closure(&partial_scan_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4924 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4925 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4926 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4927 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4928 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4929 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4930 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4931 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4932 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4933 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4934 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4935 // We also need to mark copied objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4936 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4937 copy_perm_cl = ©_mark_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4938 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4939 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4940 // Keep alive closure. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4941 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4942 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4943 // Complete GC closure |
|
4dfb2df418f2
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|
4944 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _task_queues, _terminator); |
|
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|
4945 |
|
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|
4946 // Call the reference processing task's work routine. |
|
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|
4947 _proc_task.work(i, is_alive, keep_alive, drain_queue); |
|
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|
4948 |
|
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|
4949 // Note we cannot assert that the refs array is empty here as not all |
|
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|
4950 // of the processing tasks (specifically phase2 - pp2_work) execute |
|
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|
4951 // the complete_gc closure (which ordinarily would drain the queue) so |
|
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|
4952 // the queue may not be empty. |
|
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|
4953 } |
|
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|
4954 }; |
|
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changeset
|
4955 |
|
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|
4956 // Driver routine for parallel reference processing. |
|
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|
4957 // Creates an instance of the ref processing gang |
|
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|
4958 // task and has the worker threads execute it. |
|
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|
4959 void G1STWRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
|
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|
4960 assert(_workers != NULL, "Need parallel worker threads."); |
|
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|
4961 |
|
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|
4962 ParallelTaskTerminator terminator(_active_workers, _queues); |
|
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|
4963 G1STWRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _queues, &terminator); |
|
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|
4964 |
|
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|
4965 _g1h->set_par_threads(_active_workers); |
|
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|
4966 _workers->run_task(&proc_task_proxy); |
|
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|
4967 _g1h->set_par_threads(0); |
|
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|
4968 } |
|
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|
4969 |
|
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|
4970 // Gang task for parallel reference enqueueing. |
|
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|
4971 |
|
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|
4972 class G1STWRefEnqueueTaskProxy: public AbstractGangTask { |
|
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|
4973 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
|
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|
4974 EnqueueTask& _enq_task; |
|
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|
4975 |
|
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|
4976 public: |
|
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|
4977 G1STWRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
|
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|
4978 AbstractGangTask("Enqueue reference objects in parallel"), |
|
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|
4979 _enq_task(enq_task) |
|
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|
4980 { } |
|
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|
4981 |
|
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|
4982 virtual void work(int i) { |
|
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|
4983 _enq_task.work(i); |
|
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|
4984 } |
|
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|
4985 }; |
|
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|
4986 |
|
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|
4987 // Driver routine for parallel reference enqueing. |
|
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|
4988 // Creates an instance of the ref enqueueing gang |
|
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|
4989 // task and has the worker threads execute it. |
|
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|
4990 |
|
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|
4991 void G1STWRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
|
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|
4992 assert(_workers != NULL, "Need parallel worker threads."); |
|
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|
4993 |
|
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|
4994 G1STWRefEnqueueTaskProxy enq_task_proxy(enq_task); |
|
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|
4995 |
|
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|
4996 _g1h->set_par_threads(_active_workers); |
|
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|
4997 _workers->run_task(&enq_task_proxy); |
|
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|
4998 _g1h->set_par_threads(0); |
|
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|
4999 } |
|
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changeset
|
5000 |
|
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|
5001 // End of weak reference support closures |
|
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|
5002 |
|
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|
5003 // Abstract task used to preserve (i.e. copy) any referent objects |
|
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|
5004 // that are in the collection set and are pointed to by reference |
|
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|
5005 // objects discovered by the CM ref processor. |
|
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|
5006 |
|
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|
5007 class G1ParPreserveCMReferentsTask: public AbstractGangTask { |
|
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|
5008 protected: |
|
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diff
changeset
|
5009 G1CollectedHeap* _g1h; |
|
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|
5010 RefToScanQueueSet *_queues; |
|
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diff
changeset
|
5011 ParallelTaskTerminator _terminator; |
|
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diff
changeset
|
5012 int _n_workers; |
|
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diff
changeset
|
5013 |
|
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diff
changeset
|
5014 public: |
|
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diff
changeset
|
5015 G1ParPreserveCMReferentsTask(G1CollectedHeap* g1h,int workers, RefToScanQueueSet *task_queues) : |
|
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changeset
|
5016 AbstractGangTask("ParPreserveCMReferents"), |
|
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diff
changeset
|
5017 _g1h(g1h), |
|
4dfb2df418f2
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diff
changeset
|
5018 _queues(task_queues), |
|
4dfb2df418f2
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changeset
|
5019 _terminator(workers, _queues), |
|
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changeset
|
5020 _n_workers(workers) |
|
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diff
changeset
|
5021 { } |
|
4dfb2df418f2
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diff
changeset
|
5022 |
|
4dfb2df418f2
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diff
changeset
|
5023 void work(int i) { |
|
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diff
changeset
|
5024 ResourceMark rm; |
|
4dfb2df418f2
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diff
changeset
|
5025 HandleMark hm; |
|
4dfb2df418f2
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diff
changeset
|
5026 |
|
4dfb2df418f2
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diff
changeset
|
5027 G1ParScanThreadState pss(_g1h, i); |
|
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changeset
|
5028 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
|
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|
5029 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
|
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|
5030 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
|
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changeset
|
5031 |
|
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diff
changeset
|
5032 pss.set_evac_closure(&scan_evac_cl); |
|
4dfb2df418f2
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|
5033 pss.set_evac_failure_closure(&evac_failure_cl); |
|
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changeset
|
5034 pss.set_partial_scan_closure(&partial_scan_cl); |
|
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|
5035 |
|
4dfb2df418f2
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diff
changeset
|
5036 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
|
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diff
changeset
|
5037 |
|
4dfb2df418f2
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changeset
|
5038 |
|
4dfb2df418f2
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diff
changeset
|
5039 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
|
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|
5040 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
|
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changeset
|
5041 |
|
4dfb2df418f2
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diff
changeset
|
5042 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
|
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changeset
|
5043 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
|
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|
5044 |
|
4dfb2df418f2
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diff
changeset
|
5045 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
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|
5046 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
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|
5047 |
|
4dfb2df418f2
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diff
changeset
|
5048 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
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diff
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|
5049 // We also need to mark copied objects. |
|
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diff
changeset
|
5050 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
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|
5051 copy_perm_cl = ©_mark_perm_cl; |
|
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changeset
|
5052 } |
|
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diff
changeset
|
5053 |
|
4dfb2df418f2
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diff
changeset
|
5054 // Is alive closure |
|
4dfb2df418f2
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diff
changeset
|
5055 G1AlwaysAliveClosure always_alive(_g1h); |
|
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diff
changeset
|
5056 |
|
4dfb2df418f2
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diff
changeset
|
5057 // Copying keep alive closure. Applied to referent objects that need |
|
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diff
changeset
|
5058 // to be copied. |
|
4dfb2df418f2
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diff
changeset
|
5059 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
|
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changeset
|
5060 |
|
4dfb2df418f2
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diff
changeset
|
5061 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
|
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diff
changeset
|
5062 |
|
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diff
changeset
|
5063 int limit = ReferenceProcessor::number_of_subclasses_of_ref() * rp->max_num_q(); |
|
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changeset
|
5064 int stride = MIN2(MAX2(_n_workers, 1), limit); |
|
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diff
changeset
|
5065 |
|
4dfb2df418f2
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diff
changeset
|
5066 // limit is set using max_num_q() - which was set using ParallelGCThreads. |
|
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diff
changeset
|
5067 // So this must be true - but assert just in case someone decides to |
|
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changeset
|
5068 // change the worker ids. |
|
4dfb2df418f2
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changeset
|
5069 assert(0 <= i && i < limit, "sanity"); |
|
4dfb2df418f2
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diff
changeset
|
5070 assert(!rp->discovery_is_atomic(), "check this code"); |
|
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parents:
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diff
changeset
|
5071 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5072 // Select discovered lists [i, i+stride, i+2*stride,...,limit) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5073 for (int idx = i; idx < limit; idx += stride) { |
|
4014
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
4013
diff
changeset
|
5074 DiscoveredList& ref_list = rp->discovered_refs()[idx]; |
|
3979
4dfb2df418f2
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diff
changeset
|
5075 |
|
4dfb2df418f2
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diff
changeset
|
5076 DiscoveredListIterator iter(ref_list, &keep_alive, &always_alive); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5077 while (iter.has_next()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5078 // Since discovery is not atomic for the CM ref processor, we |
|
4dfb2df418f2
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3973
diff
changeset
|
5079 // can see some null referent objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5080 iter.load_ptrs(DEBUG_ONLY(true)); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5081 oop ref = iter.obj(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5082 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5083 // This will filter nulls. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5084 if (iter.is_referent_alive()) { |
|
4dfb2df418f2
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diff
changeset
|
5085 iter.make_referent_alive(); |
|
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6484982: G1: process references during evacuation pauses
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diff
changeset
|
5086 } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5087 iter.move_to_next(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5088 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5089 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5090 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5091 // Drain the queue - which may cause stealing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5092 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _queues, &_terminator); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5093 drain_queue.do_void(); |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5094 // Allocation buffers were retired at the end of G1ParEvacuateFollowersClosure |
|
4dfb2df418f2
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diff
changeset
|
5095 assert(pss.refs()->is_empty(), "should be"); |
|
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parents:
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diff
changeset
|
5096 } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5097 }; |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5098 |
|
4dfb2df418f2
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diff
changeset
|
5099 // Weak Reference processing during an evacuation pause (part 1). |
|
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diff
changeset
|
5100 void G1CollectedHeap::process_discovered_references() { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5101 double ref_proc_start = os::elapsedTime(); |
|
4dfb2df418f2
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diff
changeset
|
5102 |
|
4dfb2df418f2
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diff
changeset
|
5103 ReferenceProcessor* rp = _ref_processor_stw; |
|
4dfb2df418f2
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changeset
|
5104 assert(rp->discovery_enabled(), "should have been enabled"); |
|
4dfb2df418f2
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diff
changeset
|
5105 |
|
4dfb2df418f2
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diff
changeset
|
5106 // Any reference objects, in the collection set, that were 'discovered' |
|
4dfb2df418f2
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diff
changeset
|
5107 // by the CM ref processor should have already been copied (either by |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5108 // applying the external root copy closure to the discovered lists, or |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5109 // by following an RSet entry). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5110 // |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5111 // But some of the referents, that are in the collection set, that these |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5112 // reference objects point to may not have been copied: the STW ref |
|
4dfb2df418f2
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diff
changeset
|
5113 // processor would have seen that the reference object had already |
|
4dfb2df418f2
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diff
changeset
|
5114 // been 'discovered' and would have skipped discovering the reference, |
|
4dfb2df418f2
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diff
changeset
|
5115 // but would not have treated the reference object as a regular oop. |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5116 // As a reult the copy closure would not have been applied to the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5117 // referent object. |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5118 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5119 // We need to explicitly copy these referent objects - the references |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5120 // will be processed at the end of remarking. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5121 // |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5122 // We also need to do this copying before we process the reference |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5123 // objects discovered by the STW ref processor in case one of these |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5124 // referents points to another object which is also referenced by an |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5125 // object discovered by the STW ref processor. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5126 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5127 int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5128 workers()->total_workers() : 1); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5129 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5130 set_par_threads(n_workers); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5131 G1ParPreserveCMReferentsTask keep_cm_referents(this, n_workers, _task_queues); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5132 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5133 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5134 workers()->run_task(&keep_cm_referents); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5135 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5136 keep_cm_referents.work(0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5137 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5138 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5139 set_par_threads(0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5140 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5141 // Closure to test whether a referent is alive. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5142 G1STWIsAliveClosure is_alive(this); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5143 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5144 // Even when parallel reference processing is enabled, the processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5145 // of JNI refs is serial and performed serially by the current thread |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5146 // rather than by a worker. The following PSS will be used for processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5147 // JNI refs. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5148 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5149 // Use only a single queue for this PSS. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5150 G1ParScanThreadState pss(this, 0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5151 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5152 // We do not embed a reference processor in the copying/scanning |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5153 // closures while we're actually processing the discovered |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5154 // reference objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5155 G1ParScanHeapEvacClosure scan_evac_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5156 G1ParScanHeapEvacFailureClosure evac_failure_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5157 G1ParScanPartialArrayClosure partial_scan_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5158 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5159 pss.set_evac_closure(&scan_evac_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5160 pss.set_evac_failure_closure(&evac_failure_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5161 pss.set_partial_scan_closure(&partial_scan_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5162 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5163 assert(pss.refs()->is_empty(), "pre-condition"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5164 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5165 G1ParScanExtRootClosure only_copy_non_heap_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5166 G1ParScanPermClosure only_copy_perm_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5167 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5168 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5169 G1ParScanAndMarkPermClosure copy_mark_perm_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5170 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5171 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5172 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5173 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5174 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5175 // We also need to mark copied objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5176 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5177 copy_perm_cl = ©_mark_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5178 } |
|
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5179 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5180 // Keep alive closure. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5181 G1CopyingKeepAliveClosure keep_alive(this, copy_non_heap_cl, copy_perm_cl, &pss); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5182 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5183 // Serial Complete GC closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5184 G1STWDrainQueueClosure drain_queue(this, &pss); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5185 |
|
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5186 // Setup the soft refs policy... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5187 rp->setup_policy(false); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5188 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5189 if (!rp->processing_is_mt()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5190 // Serial reference processing... |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5191 rp->process_discovered_references(&is_alive, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5192 &keep_alive, |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5193 &drain_queue, |
|
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|
5194 NULL); |
|
4dfb2df418f2
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diff
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|
5195 } else { |
|
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diff
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|
5196 // Parallel reference processing |
|
4dfb2df418f2
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diff
changeset
|
5197 int active_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); |
|
4dfb2df418f2
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|
5198 assert(rp->num_q() == active_workers, "sanity"); |
|
4dfb2df418f2
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|
5199 assert(active_workers <= rp->max_num_q(), "sanity"); |
|
4dfb2df418f2
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|
5200 |
|
4dfb2df418f2
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diff
changeset
|
5201 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
|
4dfb2df418f2
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changeset
|
5202 rp->process_discovered_references(&is_alive, &keep_alive, &drain_queue, &par_task_executor); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
5203 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5204 |
|
4dfb2df418f2
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diff
changeset
|
5205 // We have completed copying any necessary live referent objects |
|
4dfb2df418f2
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|
5206 // (that were not copied during the actual pause) so we can |
|
4dfb2df418f2
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diff
changeset
|
5207 // retire any active alloc buffers |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5208 pss.retire_alloc_buffers(); |
|
4dfb2df418f2
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diff
changeset
|
5209 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
|
4dfb2df418f2
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diff
changeset
|
5210 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5211 double ref_proc_time = os::elapsedTime() - ref_proc_start; |
|
4dfb2df418f2
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parents:
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|
5212 g1_policy()->record_ref_proc_time(ref_proc_time * 1000.0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
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|
5213 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5214 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5215 // Weak Reference processing during an evacuation pause (part 2). |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5216 void G1CollectedHeap::enqueue_discovered_references() { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5217 double ref_enq_start = os::elapsedTime(); |
|
4dfb2df418f2
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parents:
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diff
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|
5218 |
|
4dfb2df418f2
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diff
changeset
|
5219 ReferenceProcessor* rp = _ref_processor_stw; |
|
4dfb2df418f2
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|
5220 assert(!rp->discovery_enabled(), "should have been disabled as part of processing"); |
|
4dfb2df418f2
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diff
changeset
|
5221 |
|
4dfb2df418f2
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diff
changeset
|
5222 // Now enqueue any remaining on the discovered lists on to |
|
4dfb2df418f2
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diff
changeset
|
5223 // the pending list. |
|
4dfb2df418f2
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diff
changeset
|
5224 if (!rp->processing_is_mt()) { |
|
4dfb2df418f2
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parents:
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diff
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|
5225 // Serial reference processing... |
|
4dfb2df418f2
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diff
changeset
|
5226 rp->enqueue_discovered_references(); |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5227 } else { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5228 // Parallel reference enqueuing |
|
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5229 |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5230 int active_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5231 assert(rp->num_q() == active_workers, "sanity"); |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5232 assert(active_workers <= rp->max_num_q(), "sanity"); |
|
4dfb2df418f2
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diff
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|
5233 |
|
4dfb2df418f2
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diff
changeset
|
5234 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
|
4dfb2df418f2
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changeset
|
5235 rp->enqueue_discovered_references(&par_task_executor); |
|
4dfb2df418f2
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johnc
parents:
3973
diff
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|
5236 } |
|
4dfb2df418f2
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diff
changeset
|
5237 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5238 rp->verify_no_references_recorded(); |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5239 assert(!rp->discovery_enabled(), "should have been disabled"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5240 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5241 // FIXME |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5242 // CM's reference processing also cleans up the string and symbol tables. |
|
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5243 // Should we do that here also? We could, but it is a serial operation |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5244 // and could signicantly increase the pause time. |
|
4dfb2df418f2
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johnc
parents:
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diff
changeset
|
5245 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5246 double ref_enq_time = os::elapsedTime() - ref_enq_start; |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5247 g1_policy()->record_ref_enq_time(ref_enq_time * 1000.0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5248 } |
|
4dfb2df418f2
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diff
changeset
|
5249 |
| 342 | 5250 void G1CollectedHeap::evacuate_collection_set() { |
| 5251 set_evacuation_failed(false); | |
| 5252 | |
| 5253 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
| 5254 concurrent_g1_refine()->set_use_cache(false); | |
| 889 | 5255 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
| 5256 | |
| 342 | 5257 int n_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); |
| 5258 set_par_threads(n_workers); | |
| 5259 G1ParTask g1_par_task(this, n_workers, _task_queues); | |
| 5260 | |
| 5261 init_for_evac_failure(NULL); | |
| 5262 | |
| 5263 rem_set()->prepare_for_younger_refs_iterate(true); | |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
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|
5264 |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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parents:
595
diff
changeset
|
5265 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
| 342 | 5266 double start_par = os::elapsedTime(); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5267 |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
5268 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 5269 // The individual threads will set their evac-failure closures. |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5270 StrongRootsScope srs(this); |
| 1709 | 5271 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
| 342 | 5272 workers()->run_task(&g1_par_task); |
| 5273 } else { | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5274 StrongRootsScope srs(this); |
| 342 | 5275 g1_par_task.work(0); |
| 5276 } | |
| 5277 | |
| 5278 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
| 5279 g1_policy()->record_par_time(par_time); | |
| 5280 set_par_threads(0); | |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5281 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5282 // Process any discovered reference objects - we have |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5283 // to do this _before_ we retire the GC alloc regions |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5284 // as we may have to copy some 'reachable' referent |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5285 // objects (and their reachable sub-graphs) that were |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5286 // not copied during the pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5287 process_discovered_references(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5288 |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5289 // Weak root processing. |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5290 // Note: when JSR 292 is enabled and code blobs can contain |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5291 // non-perm oops then we will need to process the code blobs |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5292 // here too. |
| 342 | 5293 { |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5294 G1STWIsAliveClosure is_alive(this); |
| 342 | 5295 G1KeepAliveClosure keep_alive(this); |
| 5296 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
| 5297 } | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5298 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5299 release_gc_alloc_regions(); |
| 342 | 5300 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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595
diff
changeset
|
5301 |
| 889 | 5302 concurrent_g1_refine()->clear_hot_cache(); |
| 342 | 5303 concurrent_g1_refine()->set_use_cache(true); |
| 5304 | |
| 5305 finalize_for_evac_failure(); | |
| 5306 | |
| 5307 // Must do this before removing self-forwarding pointers, which clears | |
| 5308 // the per-region evac-failure flags. | |
| 5309 concurrent_mark()->complete_marking_in_collection_set(); | |
| 5310 | |
| 5311 if (evacuation_failed()) { | |
| 5312 remove_self_forwarding_pointers(); | |
| 5313 if (PrintGCDetails) { | |
|
1719
b63010841f78
6975964: G1: print out a more descriptive message for evacuation failure when +PrintGCDetails is set
tonyp
parents:
1718
diff
changeset
|
5314 gclog_or_tty->print(" (to-space overflow)"); |
| 342 | 5315 } else if (PrintGC) { |
| 5316 gclog_or_tty->print("--"); | |
| 5317 } | |
| 5318 } | |
| 5319 | |
|
3979
4dfb2df418f2
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parents:
3973
diff
changeset
|
5320 // Enqueue any remaining references remaining on the STW |
|
4dfb2df418f2
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johnc
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3973
diff
changeset
|
5321 // reference processor's discovered lists. We need to do |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5322 // this after the card table is cleaned (and verified) as |
|
4dfb2df418f2
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3973
diff
changeset
|
5323 // the act of enqueuing entries on to the pending list |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5324 // will log these updates (and dirty their associated |
|
4dfb2df418f2
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johnc
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3973
diff
changeset
|
5325 // cards). We need these updates logged to update any |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5326 // RSets. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5327 enqueue_discovered_references(); |
|
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5328 |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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595
diff
changeset
|
5329 if (G1DeferredRSUpdate) { |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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595
diff
changeset
|
5330 RedirtyLoggedCardTableEntryFastClosure redirty; |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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595
diff
changeset
|
5331 dirty_card_queue_set().set_closure(&redirty); |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5332 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
| 1111 | 5333 |
| 5334 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
| 5335 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5336 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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595
diff
changeset
|
5337 } |
| 342 | 5338 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
| 5339 } | |
| 5340 | |
| 2173 | 5341 void G1CollectedHeap::free_region_if_empty(HeapRegion* hr, |
| 2152 | 5342 size_t* pre_used, |
| 5343 FreeRegionList* free_list, | |
| 4072 | 5344 OldRegionSet* old_proxy_set, |
| 2152 | 5345 HumongousRegionSet* humongous_proxy_set, |
| 2173 | 5346 HRRSCleanupTask* hrrs_cleanup_task, |
| 2152 | 5347 bool par) { |
| 5348 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { | |
| 5349 if (hr->isHumongous()) { | |
| 5350 assert(hr->startsHumongous(), "we should only see starts humongous"); | |
| 5351 free_humongous_region(hr, pre_used, free_list, humongous_proxy_set, par); | |
| 5352 } else { | |
| 4072 | 5353 _old_set.remove_with_proxy(hr, old_proxy_set); |
| 2152 | 5354 free_region(hr, pre_used, free_list, par); |
| 342 | 5355 } |
| 2173 | 5356 } else { |
| 5357 hr->rem_set()->do_cleanup_work(hrrs_cleanup_task); | |
| 342 | 5358 } |
| 5359 } | |
| 5360 | |
| 2152 | 5361 void G1CollectedHeap::free_region(HeapRegion* hr, |
| 5362 size_t* pre_used, | |
| 5363 FreeRegionList* free_list, | |
| 5364 bool par) { | |
| 5365 assert(!hr->isHumongous(), "this is only for non-humongous regions"); | |
| 5366 assert(!hr->is_empty(), "the region should not be empty"); | |
| 5367 assert(free_list != NULL, "pre-condition"); | |
| 5368 | |
| 5369 *pre_used += hr->used(); | |
| 5370 hr->hr_clear(par, true /* clear_space */); | |
|
2432
455328d90876
7029458: G1: Add newly-reclaimed regions to the beginning of the region free list, not the end
tonyp
parents:
2369
diff
changeset
|
5371 free_list->add_as_head(hr); |
| 2152 | 5372 } |
| 5373 | |
| 5374 void G1CollectedHeap::free_humongous_region(HeapRegion* hr, | |
| 5375 size_t* pre_used, | |
| 5376 FreeRegionList* free_list, | |
| 5377 HumongousRegionSet* humongous_proxy_set, | |
| 5378 bool par) { | |
| 5379 assert(hr->startsHumongous(), "this is only for starts humongous regions"); | |
| 5380 assert(free_list != NULL, "pre-condition"); | |
| 5381 assert(humongous_proxy_set != NULL, "pre-condition"); | |
| 5382 | |
| 5383 size_t hr_used = hr->used(); | |
| 5384 size_t hr_capacity = hr->capacity(); | |
| 5385 size_t hr_pre_used = 0; | |
| 5386 _humongous_set.remove_with_proxy(hr, humongous_proxy_set); | |
| 5387 hr->set_notHumongous(); | |
| 5388 free_region(hr, &hr_pre_used, free_list, par); | |
| 5389 | |
| 3766 | 5390 size_t i = hr->hrs_index() + 1; |
| 2152 | 5391 size_t num = 1; |
| 3766 | 5392 while (i < n_regions()) { |
| 5393 HeapRegion* curr_hr = region_at(i); | |
| 2152 | 5394 if (!curr_hr->continuesHumongous()) { |
| 5395 break; | |
| 5396 } | |
| 5397 curr_hr->set_notHumongous(); | |
| 5398 free_region(curr_hr, &hr_pre_used, free_list, par); | |
| 5399 num += 1; | |
| 5400 i += 1; | |
| 5401 } | |
| 5402 assert(hr_pre_used == hr_used, | |
| 5403 err_msg("hr_pre_used: "SIZE_FORMAT" and hr_used: "SIZE_FORMAT" " | |
| 5404 "should be the same", hr_pre_used, hr_used)); | |
| 5405 *pre_used += hr_pre_used; | |
| 5406 } | |
| 5407 | |
| 5408 void G1CollectedHeap::update_sets_after_freeing_regions(size_t pre_used, | |
| 5409 FreeRegionList* free_list, | |
| 4072 | 5410 OldRegionSet* old_proxy_set, |
| 2152 | 5411 HumongousRegionSet* humongous_proxy_set, |
| 5412 bool par) { | |
| 5413 if (pre_used > 0) { | |
| 5414 Mutex* lock = (par) ? ParGCRareEvent_lock : NULL; | |
| 342 | 5415 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); |
| 2152 | 5416 assert(_summary_bytes_used >= pre_used, |
| 5417 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" " | |
| 5418 "should be >= pre_used: "SIZE_FORMAT, | |
| 5419 _summary_bytes_used, pre_used)); | |
| 342 | 5420 _summary_bytes_used -= pre_used; |
| 2152 | 5421 } |
| 5422 if (free_list != NULL && !free_list->is_empty()) { | |
| 5423 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); | |
|
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|
5424 _free_list.add_as_head(free_list); |
| 2152 | 5425 } |
| 4072 | 5426 if (old_proxy_set != NULL && !old_proxy_set->is_empty()) { |
| 5427 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
| 5428 _old_set.update_from_proxy(old_proxy_set); | |
| 5429 } | |
| 2152 | 5430 if (humongous_proxy_set != NULL && !humongous_proxy_set->is_empty()) { |
| 5431 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
| 5432 _humongous_set.update_from_proxy(humongous_proxy_set); | |
| 342 | 5433 } |
| 5434 } | |
| 5435 | |
|
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|
5436 class G1ParCleanupCTTask : public AbstractGangTask { |
|
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|
5437 CardTableModRefBS* _ct_bs; |
|
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|
5438 G1CollectedHeap* _g1h; |
|
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5439 HeapRegion* volatile _su_head; |
|
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|
5440 public: |
|
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|
5441 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
|
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|
5442 G1CollectedHeap* g1h) : |
|
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|
5443 AbstractGangTask("G1 Par Cleanup CT Task"), |
|
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|
5444 _ct_bs(ct_bs), _g1h(g1h) { } |
|
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|
5445 |
|
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|
5446 void work(int i) { |
|
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|
5447 HeapRegion* r; |
|
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|
5448 while (r = _g1h->pop_dirty_cards_region()) { |
|
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|
5449 clear_cards(r); |
|
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|
5450 } |
|
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|
5451 } |
|
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|
5452 |
|
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|
5453 void clear_cards(HeapRegion* r) { |
|
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|
5454 // Cards of the survivors should have already been dirtied. |
|
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|
5455 if (!r->is_survivor()) { |
|
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5456 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
|
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|
5457 } |
|
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|
5458 } |
|
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|
5459 }; |
|
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|
5460 |
|
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|
5461 #ifndef PRODUCT |
|
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|
5462 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
|
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|
5463 G1CollectedHeap* _g1h; |
|
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|
5464 CardTableModRefBS* _ct_bs; |
|
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|
5465 public: |
|
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|
5466 G1VerifyCardTableCleanup(G1CollectedHeap* g1h, CardTableModRefBS* ct_bs) |
|
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|
5467 : _g1h(g1h), _ct_bs(ct_bs) { } |
|
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|
5468 virtual bool doHeapRegion(HeapRegion* r) { |
|
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|
5469 if (r->is_survivor()) { |
|
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|
5470 _g1h->verify_dirty_region(r); |
|
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|
5471 } else { |
|
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|
5472 _g1h->verify_not_dirty_region(r); |
|
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|
5473 } |
|
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|
5474 return false; |
|
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|
5475 } |
|
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|
5476 }; |
|
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|
5477 |
|
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|
5478 void G1CollectedHeap::verify_not_dirty_region(HeapRegion* hr) { |
|
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|
5479 // All of the region should be clean. |
|
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|
5480 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); |
|
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|
5481 MemRegion mr(hr->bottom(), hr->end()); |
|
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|
5482 ct_bs->verify_not_dirty_region(mr); |
|
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|
5483 } |
|
063382f9b575
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|
5484 |
|
063382f9b575
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|
5485 void G1CollectedHeap::verify_dirty_region(HeapRegion* hr) { |
|
063382f9b575
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|
5486 // We cannot guarantee that [bottom(),end()] is dirty. Threads |
|
063382f9b575
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|
5487 // dirty allocated blocks as they allocate them. The thread that |
|
063382f9b575
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|
5488 // retires each region and replaces it with a new one will do a |
|
063382f9b575
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|
5489 // maximal allocation to fill in [pre_dummy_top(),end()] but will |
|
063382f9b575
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|
5490 // not dirty that area (one less thing to have to do while holding |
|
063382f9b575
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|
5491 // a lock). So we can only verify that [bottom(),pre_dummy_top()] |
|
063382f9b575
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|
5492 // is dirty. |
|
063382f9b575
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|
5493 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
|
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|
5494 MemRegion mr(hr->bottom(), hr->pre_dummy_top()); |
|
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|
5495 ct_bs->verify_dirty_region(mr); |
|
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|
5496 } |
|
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|
5497 |
|
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|
5498 void G1CollectedHeap::verify_dirty_young_list(HeapRegion* head) { |
|
3317
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|
5499 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
|
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|
5500 for (HeapRegion* hr = head; hr != NULL; hr = hr->get_next_young_region()) { |
|
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|
5501 verify_dirty_region(hr); |
|
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|
5502 } |
|
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|
5503 } |
|
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|
5504 |
|
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|
5505 void G1CollectedHeap::verify_dirty_young_regions() { |
|
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|
5506 verify_dirty_young_list(_young_list->first_region()); |
|
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|
5507 verify_dirty_young_list(_young_list->first_survivor_region()); |
|
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|
5508 } |
|
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|
5509 #endif |
|
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|
5510 |
| 342 | 5511 void G1CollectedHeap::cleanUpCardTable() { |
| 5512 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
| 5513 double start = os::elapsedTime(); | |
| 5514 | |
| 4023 | 5515 { |
| 5516 // Iterate over the dirty cards region list. | |
| 5517 G1ParCleanupCTTask cleanup_task(ct_bs, this); | |
| 5518 | |
| 5519 if (ParallelGCThreads > 0) { | |
| 5520 set_par_threads(workers()->total_workers()); | |
| 5521 workers()->run_task(&cleanup_task); | |
| 5522 set_par_threads(0); | |
| 5523 } else { | |
| 5524 while (_dirty_cards_region_list) { | |
| 5525 HeapRegion* r = _dirty_cards_region_list; | |
| 5526 cleanup_task.clear_cards(r); | |
| 5527 _dirty_cards_region_list = r->get_next_dirty_cards_region(); | |
| 5528 if (_dirty_cards_region_list == r) { | |
| 5529 // The last region. | |
| 5530 _dirty_cards_region_list = NULL; | |
| 5531 } | |
| 5532 r->set_next_dirty_cards_region(NULL); | |
|
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|
5533 } |
|
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|
5534 } |
| 4023 | 5535 #ifndef PRODUCT |
| 5536 if (G1VerifyCTCleanup || VerifyAfterGC) { | |
| 5537 G1VerifyCardTableCleanup cleanup_verifier(this, ct_bs); | |
| 5538 heap_region_iterate(&cleanup_verifier); | |
| 5539 } | |
| 5540 #endif | |
|
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|
5541 } |
|
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|
5542 |
| 342 | 5543 double elapsed = os::elapsedTime() - start; |
|
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|
5544 g1_policy()->record_clear_ct_time(elapsed * 1000.0); |
| 342 | 5545 } |
| 5546 | |
| 5547 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
| 2152 | 5548 size_t pre_used = 0; |
| 5549 FreeRegionList local_free_list("Local List for CSet Freeing"); | |
| 5550 | |
| 342 | 5551 double young_time_ms = 0.0; |
| 5552 double non_young_time_ms = 0.0; | |
| 5553 | |
|
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|
5554 // Since the collection set is a superset of the the young list, |
|
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|
5555 // all we need to do to clear the young list is clear its |
|
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|
5556 // head and length, and unlink any young regions in the code below |
|
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|
5557 _young_list->clear(); |
|
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|
5558 |
| 342 | 5559 G1CollectorPolicy* policy = g1_policy(); |
| 5560 | |
| 5561 double start_sec = os::elapsedTime(); | |
| 5562 bool non_young = true; | |
| 5563 | |
| 5564 HeapRegion* cur = cs_head; | |
| 5565 int age_bound = -1; | |
| 5566 size_t rs_lengths = 0; | |
| 5567 | |
| 5568 while (cur != NULL) { | |
| 2361 | 5569 assert(!is_on_master_free_list(cur), "sanity"); |
| 2152 | 5570 |
| 342 | 5571 if (non_young) { |
| 5572 if (cur->is_young()) { | |
| 5573 double end_sec = os::elapsedTime(); | |
| 5574 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 5575 non_young_time_ms += elapsed_ms; | |
| 5576 | |
| 5577 start_sec = os::elapsedTime(); | |
| 5578 non_young = false; | |
| 5579 } | |
| 5580 } else { | |
| 2152 | 5581 double end_sec = os::elapsedTime(); |
| 5582 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 5583 young_time_ms += elapsed_ms; | |
| 5584 | |
| 5585 start_sec = os::elapsedTime(); | |
| 5586 non_young = true; | |
| 342 | 5587 } |
| 5588 | |
| 5589 rs_lengths += cur->rem_set()->occupied(); | |
| 5590 | |
| 5591 HeapRegion* next = cur->next_in_collection_set(); | |
| 5592 assert(cur->in_collection_set(), "bad CS"); | |
| 5593 cur->set_next_in_collection_set(NULL); | |
| 5594 cur->set_in_collection_set(false); | |
| 5595 | |
| 5596 if (cur->is_young()) { | |
| 5597 int index = cur->young_index_in_cset(); | |
| 5598 guarantee( index != -1, "invariant" ); | |
| 5599 guarantee( (size_t)index < policy->young_cset_length(), "invariant" ); | |
| 5600 size_t words_survived = _surviving_young_words[index]; | |
| 5601 cur->record_surv_words_in_group(words_survived); | |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5602 |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5603 // At this point the we have 'popped' cur from the collection set |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5604 // (linked via next_in_collection_set()) but it is still in the |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5605 // young list (linked via next_young_region()). Clear the |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5606 // _next_young_region field. |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5607 cur->set_next_young_region(NULL); |
| 342 | 5608 } else { |
| 5609 int index = cur->young_index_in_cset(); | |
| 5610 guarantee( index == -1, "invariant" ); | |
| 5611 } | |
| 5612 | |
| 5613 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
| 5614 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
| 5615 "invariant" ); | |
| 5616 | |
| 5617 if (!cur->evacuation_failed()) { | |
| 5618 // And the region is empty. | |
| 2152 | 5619 assert(!cur->is_empty(), "Should not have empty regions in a CS."); |
| 5620 free_region(cur, &pre_used, &local_free_list, false /* par */); | |
| 342 | 5621 } else { |
| 5622 cur->uninstall_surv_rate_group(); | |
| 5623 if (cur->is_young()) | |
| 5624 cur->set_young_index_in_cset(-1); | |
| 5625 cur->set_not_young(); | |
| 5626 cur->set_evacuation_failed(false); | |
| 4072 | 5627 // The region is now considered to be old. |
| 5628 _old_set.add(cur); | |
| 342 | 5629 } |
| 5630 cur = next; | |
| 5631 } | |
| 5632 | |
| 5633 policy->record_max_rs_lengths(rs_lengths); | |
| 5634 policy->cset_regions_freed(); | |
| 5635 | |
| 5636 double end_sec = os::elapsedTime(); | |
| 5637 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 5638 if (non_young) | |
| 5639 non_young_time_ms += elapsed_ms; | |
| 5640 else | |
| 5641 young_time_ms += elapsed_ms; | |
| 5642 | |
| 2152 | 5643 update_sets_after_freeing_regions(pre_used, &local_free_list, |
| 4072 | 5644 NULL /* old_proxy_set */, |
| 2152 | 5645 NULL /* humongous_proxy_set */, |
| 5646 false /* par */); | |
| 342 | 5647 policy->record_young_free_cset_time_ms(young_time_ms); |
| 5648 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
| 5649 } | |
| 5650 | |
|
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|
5651 // This routine is similar to the above but does not record |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5652 // any policy statistics or update free lists; we are abandoning |
|
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|
5653 // the current incremental collection set in preparation of a |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5654 // full collection. After the full GC we will start to build up |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5655 // the incremental collection set again. |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5656 // This is only called when we're doing a full collection |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5657 // and is immediately followed by the tearing down of the young list. |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5658 |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5659 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5660 HeapRegion* cur = cs_head; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5661 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
5662 while (cur != NULL) { |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
5663 HeapRegion* next = cur->next_in_collection_set(); |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5664 assert(cur->in_collection_set(), "bad CS"); |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5665 cur->set_next_in_collection_set(NULL); |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5666 cur->set_in_collection_set(false); |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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|
5667 cur->set_young_index_in_cset(-1); |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
5668 cur = next; |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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|
5669 } |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5670 } |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5671 |
| 2152 | 5672 void G1CollectedHeap::set_free_regions_coming() { |
| 5673 if (G1ConcRegionFreeingVerbose) { | |
| 5674 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
| 5675 "setting free regions coming"); | |
| 5676 } | |
| 5677 | |
| 5678 assert(!free_regions_coming(), "pre-condition"); | |
| 5679 _free_regions_coming = true; | |
| 342 | 5680 } |
| 5681 | |
| 2152 | 5682 void G1CollectedHeap::reset_free_regions_coming() { |
| 5683 { | |
| 5684 assert(free_regions_coming(), "pre-condition"); | |
| 5685 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 5686 _free_regions_coming = false; | |
| 5687 SecondaryFreeList_lock->notify_all(); | |
| 5688 } | |
| 5689 | |
| 5690 if (G1ConcRegionFreeingVerbose) { | |
| 5691 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
| 5692 "reset free regions coming"); | |
| 342 | 5693 } |
| 5694 } | |
| 5695 | |
| 2152 | 5696 void G1CollectedHeap::wait_while_free_regions_coming() { |
| 5697 // Most of the time we won't have to wait, so let's do a quick test | |
| 5698 // first before we take the lock. | |
| 5699 if (!free_regions_coming()) { | |
| 5700 return; | |
| 5701 } | |
| 5702 | |
| 5703 if (G1ConcRegionFreeingVerbose) { | |
| 5704 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
| 5705 "waiting for free regions"); | |
| 342 | 5706 } |
| 5707 | |
| 5708 { | |
| 2152 | 5709 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
| 5710 while (free_regions_coming()) { | |
| 5711 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 342 | 5712 } |
| 2152 | 5713 } |
| 5714 | |
| 5715 if (G1ConcRegionFreeingVerbose) { | |
| 5716 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
| 5717 "done waiting for free regions"); | |
| 5718 } | |
| 342 | 5719 } |
| 5720 | |
| 5721 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
| 5722 assert(heap_lock_held_for_gc(), | |
| 5723 "the heap lock should already be held by or for this thread"); | |
| 5724 _young_list->push_region(hr); | |
| 5725 g1_policy()->set_region_short_lived(hr); | |
| 5726 } | |
| 5727 | |
| 5728 class NoYoungRegionsClosure: public HeapRegionClosure { | |
| 5729 private: | |
| 5730 bool _success; | |
| 5731 public: | |
| 5732 NoYoungRegionsClosure() : _success(true) { } | |
| 5733 bool doHeapRegion(HeapRegion* r) { | |
| 5734 if (r->is_young()) { | |
| 5735 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
| 5736 r->bottom(), r->end()); | |
| 5737 _success = false; | |
| 5738 } | |
| 5739 return false; | |
| 5740 } | |
| 5741 bool success() { return _success; } | |
| 5742 }; | |
| 5743 | |
|
1394
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johnc
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diff
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|
5744 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
5745 bool ret = _young_list->check_list_empty(check_sample); |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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|
5746 |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
5747 if (check_heap) { |
| 342 | 5748 NoYoungRegionsClosure closure; |
| 5749 heap_region_iterate(&closure); | |
| 5750 ret = ret && closure.success(); | |
| 5751 } | |
| 5752 | |
| 5753 return ret; | |
| 5754 } | |
| 5755 | |
| 4072 | 5756 class TearDownRegionSetsClosure : public HeapRegionClosure { |
| 5757 private: | |
| 5758 OldRegionSet *_old_set; | |
| 2152 | 5759 |
| 342 | 5760 public: |
| 4072 | 5761 TearDownRegionSetsClosure(OldRegionSet* old_set) : _old_set(old_set) { } |
| 2152 | 5762 |
| 342 | 5763 bool doHeapRegion(HeapRegion* r) { |
| 4072 | 5764 if (r->is_empty()) { |
| 5765 // We ignore empty regions, we'll empty the free list afterwards | |
| 5766 } else if (r->is_young()) { | |
| 5767 // We ignore young regions, we'll empty the young list afterwards | |
| 5768 } else if (r->isHumongous()) { | |
| 5769 // We ignore humongous regions, we're not tearing down the | |
| 5770 // humongous region set | |
| 342 | 5771 } else { |
| 4072 | 5772 // The rest should be old |
| 5773 _old_set->remove(r); | |
| 342 | 5774 } |
| 5775 return false; | |
| 5776 } | |
| 5777 | |
| 4072 | 5778 ~TearDownRegionSetsClosure() { |
| 5779 assert(_old_set->is_empty(), "post-condition"); | |
| 2152 | 5780 } |
| 342 | 5781 }; |
| 5782 | |
| 4072 | 5783 void G1CollectedHeap::tear_down_region_sets(bool free_list_only) { |
| 5784 assert_at_safepoint(true /* should_be_vm_thread */); | |
| 5785 | |
| 5786 if (!free_list_only) { | |
| 5787 TearDownRegionSetsClosure cl(&_old_set); | |
| 5788 heap_region_iterate(&cl); | |
| 5789 | |
| 5790 // Need to do this after the heap iteration to be able to | |
| 5791 // recognize the young regions and ignore them during the iteration. | |
| 5792 _young_list->empty_list(); | |
| 5793 } | |
| 5794 _free_list.remove_all(); | |
| 5795 } | |
| 5796 | |
| 5797 class RebuildRegionSetsClosure : public HeapRegionClosure { | |
| 5798 private: | |
| 5799 bool _free_list_only; | |
| 5800 OldRegionSet* _old_set; | |
| 5801 FreeRegionList* _free_list; | |
| 5802 size_t _total_used; | |
| 5803 | |
| 5804 public: | |
| 5805 RebuildRegionSetsClosure(bool free_list_only, | |
| 5806 OldRegionSet* old_set, FreeRegionList* free_list) : | |
| 5807 _free_list_only(free_list_only), | |
| 5808 _old_set(old_set), _free_list(free_list), _total_used(0) { | |
| 5809 assert(_free_list->is_empty(), "pre-condition"); | |
| 5810 if (!free_list_only) { | |
| 5811 assert(_old_set->is_empty(), "pre-condition"); | |
| 5812 } | |
| 5813 } | |
| 5814 | |
| 5815 bool doHeapRegion(HeapRegion* r) { | |
| 5816 if (r->continuesHumongous()) { | |
| 5817 return false; | |
| 5818 } | |
| 5819 | |
| 5820 if (r->is_empty()) { | |
| 5821 // Add free regions to the free list | |
| 5822 _free_list->add_as_tail(r); | |
| 5823 } else if (!_free_list_only) { | |
| 5824 assert(!r->is_young(), "we should not come across young regions"); | |
| 5825 | |
| 5826 if (r->isHumongous()) { | |
| 5827 // We ignore humongous regions, we left the humongous set unchanged | |
| 5828 } else { | |
| 5829 // The rest should be old, add them to the old set | |
| 5830 _old_set->add(r); | |
| 5831 } | |
| 5832 _total_used += r->used(); | |
| 5833 } | |
| 5834 | |
| 5835 return false; | |
| 5836 } | |
| 5837 | |
| 5838 size_t total_used() { | |
| 5839 return _total_used; | |
| 5840 } | |
| 5841 }; | |
| 5842 | |
| 5843 void G1CollectedHeap::rebuild_region_sets(bool free_list_only) { | |
| 5844 assert_at_safepoint(true /* should_be_vm_thread */); | |
| 5845 | |
| 5846 RebuildRegionSetsClosure cl(free_list_only, &_old_set, &_free_list); | |
| 5847 heap_region_iterate(&cl); | |
| 5848 | |
| 5849 if (!free_list_only) { | |
| 5850 _summary_bytes_used = cl.total_used(); | |
| 5851 } | |
| 5852 assert(_summary_bytes_used == recalculate_used(), | |
| 5853 err_msg("inconsistent _summary_bytes_used, " | |
| 5854 "value: "SIZE_FORMAT" recalculated: "SIZE_FORMAT, | |
| 5855 _summary_bytes_used, recalculate_used())); | |
| 342 | 5856 } |
| 5857 | |
| 5858 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
| 5859 _refine_cte_cl->set_concurrent(concurrent); | |
| 5860 } | |
| 5861 | |
| 5862 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
| 5863 HeapRegion* hr = heap_region_containing(p); | |
| 5864 if (hr == NULL) { | |
| 5865 return is_in_permanent(p); | |
| 5866 } else { | |
| 5867 return hr->is_in(p); | |
| 5868 } | |
| 5869 } | |
| 2152 | 5870 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
changeset
|
5871 // Methods for the mutator alloc region |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
diff
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|
5872 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
5873 HeapRegion* G1CollectedHeap::new_mutator_alloc_region(size_t word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
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|
5874 bool force) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
changeset
|
5875 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
|
abdfc822206f
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2432
diff
changeset
|
5876 assert(!force || g1_policy()->can_expand_young_list(), |
|
abdfc822206f
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2432
diff
changeset
|
5877 "if force is true we should be able to expand the young list"); |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
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3777
diff
changeset
|
5878 bool young_list_full = g1_policy()->is_young_list_full(); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
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3777
diff
changeset
|
5879 if (force || !young_list_full) { |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
5880 HeapRegion* new_alloc_region = new_region(word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5881 false /* do_expand */); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
5882 if (new_alloc_region != NULL) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
5883 g1_policy()->update_region_num(true /* next_is_young */); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
5884 set_region_short_lived_locked(new_alloc_region); |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
5885 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Eden, young_list_full); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5886 return new_alloc_region; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5887 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5888 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5889 return NULL; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5890 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
5891 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
5892 void G1CollectedHeap::retire_mutator_alloc_region(HeapRegion* alloc_region, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
5893 size_t allocated_bytes) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
5894 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
5895 assert(alloc_region->is_young(), "all mutator alloc regions should be young"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5896 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
5897 g1_policy()->add_region_to_incremental_cset_lhs(alloc_region); |
|
abdfc822206f
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|
5898 _summary_bytes_used += allocated_bytes; |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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parents:
3777
diff
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|
5899 _hr_printer.retire(alloc_region); |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
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|
5900 // We update the eden sizes here, when the region is retired, |
|
8229bd737950
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|
5901 // instead of when it's allocated, since this is the point that its |
|
8229bd737950
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|
5902 // used space has been recored in _summary_bytes_used. |
|
8229bd737950
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|
5903 g1mm()->update_eden_size(); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
5904 } |
|
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|
5905 |
|
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7023069: G1: Introduce symmetric locking in the slow allocation path
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|
5906 HeapRegion* MutatorAllocRegion::allocate_new_region(size_t word_size, |
|
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|
5907 bool force) { |
|
abdfc822206f
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|
5908 return _g1h->new_mutator_alloc_region(word_size, force); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
5909 } |
|
abdfc822206f
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|
5910 |
|
abdfc822206f
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|
5911 void MutatorAllocRegion::retire_region(HeapRegion* alloc_region, |
|
abdfc822206f
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|
5912 size_t allocated_bytes) { |
|
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|
5913 _g1h->retire_mutator_alloc_region(alloc_region, allocated_bytes); |
|
abdfc822206f
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|
5914 } |
|
abdfc822206f
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|
5915 |
|
3830
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
5916 // Methods for the GC alloc regions |
|
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|
5917 |
|
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|
5918 HeapRegion* G1CollectedHeap::new_gc_alloc_region(size_t word_size, |
|
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|
5919 size_t count, |
|
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|
5920 GCAllocPurpose ap) { |
|
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|
5921 assert(FreeList_lock->owned_by_self(), "pre-condition"); |
|
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|
5922 |
|
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|
5923 if (count < g1_policy()->max_regions(ap)) { |
|
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|
5924 HeapRegion* new_alloc_region = new_region(word_size, |
|
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|
5925 true /* do_expand */); |
|
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|
5926 if (new_alloc_region != NULL) { |
|
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
5927 // We really only need to do this for old regions given that we |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
5928 // should never scan survivors. But it doesn't hurt to do it |
|
f44782f04dd4
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|
5929 // for survivors too. |
|
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|
5930 new_alloc_region->set_saved_mark(); |
|
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|
5931 if (ap == GCAllocForSurvived) { |
|
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|
5932 new_alloc_region->set_survivor(); |
|
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|
5933 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Survivor); |
|
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|
5934 } else { |
|
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|
5935 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Old); |
|
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|
5936 } |
|
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|
5937 return new_alloc_region; |
|
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
5938 } else { |
|
f44782f04dd4
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changeset
|
5939 g1_policy()->note_alloc_region_limit_reached(ap); |
|
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|
5940 } |
|
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|
5941 } |
|
f44782f04dd4
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|
5942 return NULL; |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
5943 } |
|
f44782f04dd4
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changeset
|
5944 |
|
f44782f04dd4
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|
5945 void G1CollectedHeap::retire_gc_alloc_region(HeapRegion* alloc_region, |
|
f44782f04dd4
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|
5946 size_t allocated_bytes, |
|
f44782f04dd4
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|
5947 GCAllocPurpose ap) { |
|
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|
5948 alloc_region->note_end_of_copying(); |
|
f44782f04dd4
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changeset
|
5949 g1_policy()->record_bytes_copied_during_gc(allocated_bytes); |
|
f44782f04dd4
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|
5950 if (ap == GCAllocForSurvived) { |
|
f44782f04dd4
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diff
changeset
|
5951 young_list()->add_survivor_region(alloc_region); |
| 4072 | 5952 } else { |
| 5953 _old_set.add(alloc_region); | |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
5954 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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changeset
|
5955 _hr_printer.retire(alloc_region); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
5956 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
5957 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
5958 HeapRegion* SurvivorGCAllocRegion::allocate_new_region(size_t word_size, |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
5959 bool force) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
changeset
|
5960 assert(!force, "not supported for GC alloc regions"); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
changeset
|
5961 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForSurvived); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
5962 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
diff
changeset
|
5963 |
|
f44782f04dd4
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diff
changeset
|
5964 void SurvivorGCAllocRegion::retire_region(HeapRegion* alloc_region, |
|
f44782f04dd4
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|
5965 size_t allocated_bytes) { |
|
f44782f04dd4
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3824
diff
changeset
|
5966 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
5967 GCAllocForSurvived); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
5968 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
5969 |
|
f44782f04dd4
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3824
diff
changeset
|
5970 HeapRegion* OldGCAllocRegion::allocate_new_region(size_t word_size, |
|
f44782f04dd4
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diff
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|
5971 bool force) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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diff
changeset
|
5972 assert(!force, "not supported for GC alloc regions"); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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diff
changeset
|
5973 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForTenured); |
|
f44782f04dd4
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diff
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|
5974 } |
|
f44782f04dd4
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diff
changeset
|
5975 |
|
f44782f04dd4
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changeset
|
5976 void OldGCAllocRegion::retire_region(HeapRegion* alloc_region, |
|
f44782f04dd4
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|
5977 size_t allocated_bytes) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
5978 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
|
f44782f04dd4
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|
5979 GCAllocForTenured); |
|
f44782f04dd4
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diff
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|
5980 } |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
5981 // Heap region set verification |
|
abdfc822206f
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changeset
|
5982 |
| 2152 | 5983 class VerifyRegionListsClosure : public HeapRegionClosure { |
| 5984 private: | |
| 4072 | 5985 FreeRegionList* _free_list; |
| 5986 OldRegionSet* _old_set; | |
| 2152 | 5987 HumongousRegionSet* _humongous_set; |
| 5988 size_t _region_count; | |
| 5989 | |
| 5990 public: | |
| 4072 | 5991 VerifyRegionListsClosure(OldRegionSet* old_set, |
| 5992 HumongousRegionSet* humongous_set, | |
| 2152 | 5993 FreeRegionList* free_list) : |
| 4072 | 5994 _old_set(old_set), _humongous_set(humongous_set), |
| 5995 _free_list(free_list), _region_count(0) { } | |
| 2152 | 5996 |
| 5997 size_t region_count() { return _region_count; } | |
| 5998 | |
| 5999 bool doHeapRegion(HeapRegion* hr) { | |
| 6000 _region_count += 1; | |
| 6001 | |
| 6002 if (hr->continuesHumongous()) { | |
| 6003 return false; | |
| 6004 } | |
| 6005 | |
| 6006 if (hr->is_young()) { | |
| 6007 // TODO | |
| 6008 } else if (hr->startsHumongous()) { | |
| 6009 _humongous_set->verify_next_region(hr); | |
| 6010 } else if (hr->is_empty()) { | |
| 6011 _free_list->verify_next_region(hr); | |
| 4072 | 6012 } else { |
| 6013 _old_set->verify_next_region(hr); | |
| 2152 | 6014 } |
| 6015 return false; | |
| 6016 } | |
| 6017 }; | |
| 6018 | |
| 3766 | 6019 HeapRegion* G1CollectedHeap::new_heap_region(size_t hrs_index, |
| 6020 HeapWord* bottom) { | |
| 6021 HeapWord* end = bottom + HeapRegion::GrainWords; | |
| 6022 MemRegion mr(bottom, end); | |
| 6023 assert(_g1_reserved.contains(mr), "invariant"); | |
| 6024 // This might return NULL if the allocation fails | |
| 6025 return new HeapRegion(hrs_index, _bot_shared, mr, true /* is_zeroed */); | |
| 6026 } | |
| 6027 | |
| 2152 | 6028 void G1CollectedHeap::verify_region_sets() { |
| 6029 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); | |
| 6030 | |
| 6031 // First, check the explicit lists. | |
| 6032 _free_list.verify(); | |
| 6033 { | |
| 6034 // Given that a concurrent operation might be adding regions to | |
| 6035 // the secondary free list we have to take the lock before | |
| 6036 // verifying it. | |
| 6037 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 6038 _secondary_free_list.verify(); | |
| 6039 } | |
| 4072 | 6040 _old_set.verify(); |
| 2152 | 6041 _humongous_set.verify(); |
| 6042 | |
| 6043 // If a concurrent region freeing operation is in progress it will | |
| 6044 // be difficult to correctly attributed any free regions we come | |
| 6045 // across to the correct free list given that they might belong to | |
| 6046 // one of several (free_list, secondary_free_list, any local lists, | |
| 6047 // etc.). So, if that's the case we will skip the rest of the | |
| 6048 // verification operation. Alternatively, waiting for the concurrent | |
| 6049 // operation to complete will have a non-trivial effect on the GC's | |
| 6050 // operation (no concurrent operation will last longer than the | |
| 6051 // interval between two calls to verification) and it might hide | |
| 6052 // any issues that we would like to catch during testing. | |
| 6053 if (free_regions_coming()) { | |
| 6054 return; | |
| 6055 } | |
| 6056 | |
| 2361 | 6057 // Make sure we append the secondary_free_list on the free_list so |
| 6058 // that all free regions we will come across can be safely | |
| 6059 // attributed to the free_list. | |
| 6060 append_secondary_free_list_if_not_empty_with_lock(); | |
| 2152 | 6061 |
| 6062 // Finally, make sure that the region accounting in the lists is | |
| 6063 // consistent with what we see in the heap. | |
| 4072 | 6064 _old_set.verify_start(); |
| 2152 | 6065 _humongous_set.verify_start(); |
| 6066 _free_list.verify_start(); | |
| 6067 | |
| 4072 | 6068 VerifyRegionListsClosure cl(&_old_set, &_humongous_set, &_free_list); |
| 2152 | 6069 heap_region_iterate(&cl); |
| 6070 | |
| 4072 | 6071 _old_set.verify_end(); |
| 2152 | 6072 _humongous_set.verify_end(); |
| 6073 _free_list.verify_end(); | |
| 342 | 6074 } |