Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 942:2c79770d1f6e
6819085: G1: use larger and/or user settable region size
Summary: Instead of the region size being hard-coded, allow the user to set it.
Reviewed-by: jmasa, johnc, apetrusenko
| author | tonyp |
|---|---|
| date | Thu, 30 Jul 2009 16:22:58 -0400 |
| parents | 8b46c4d82093 |
| children | 54b3b351d6f9 |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 579 | 2 * Copyright 2001-2009 Sun Microsystems, Inc. All Rights Reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #include "incls/_precompiled.incl" | |
| 26 #include "incls/_g1CollectedHeap.cpp.incl" | |
| 27 | |
|
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28 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0; |
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29 |
| 342 | 30 // turn it on so that the contents of the young list (scan-only / |
| 31 // to-be-collected) are printed at "strategic" points before / during | |
| 32 // / after the collection --- this is useful for debugging | |
| 33 #define SCAN_ONLY_VERBOSE 0 | |
| 34 // CURRENT STATUS | |
| 35 // This file is under construction. Search for "FIXME". | |
| 36 | |
| 37 // INVARIANTS/NOTES | |
| 38 // | |
| 39 // All allocation activity covered by the G1CollectedHeap interface is | |
| 40 // serialized by acquiring the HeapLock. This happens in | |
| 41 // mem_allocate_work, which all such allocation functions call. | |
| 42 // (Note that this does not apply to TLAB allocation, which is not part | |
| 43 // of this interface: it is done by clients of this interface.) | |
| 44 | |
| 45 // Local to this file. | |
| 46 | |
| 47 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
| 48 SuspendibleThreadSet* _sts; | |
| 49 G1RemSet* _g1rs; | |
| 50 ConcurrentG1Refine* _cg1r; | |
| 51 bool _concurrent; | |
| 52 public: | |
| 53 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
| 54 G1RemSet* g1rs, | |
| 55 ConcurrentG1Refine* cg1r) : | |
| 56 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
| 57 {} | |
| 58 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 59 _g1rs->concurrentRefineOneCard(card_ptr, worker_i); | |
| 60 if (_concurrent && _sts->should_yield()) { | |
| 61 // Caller will actually yield. | |
| 62 return false; | |
| 63 } | |
| 64 // Otherwise, we finished successfully; return true. | |
| 65 return true; | |
| 66 } | |
| 67 void set_concurrent(bool b) { _concurrent = b; } | |
| 68 }; | |
| 69 | |
| 70 | |
| 71 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 72 int _calls; | |
| 73 G1CollectedHeap* _g1h; | |
| 74 CardTableModRefBS* _ctbs; | |
| 75 int _histo[256]; | |
| 76 public: | |
| 77 ClearLoggedCardTableEntryClosure() : | |
| 78 _calls(0) | |
| 79 { | |
| 80 _g1h = G1CollectedHeap::heap(); | |
| 81 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 82 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
| 83 } | |
| 84 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 85 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 86 _calls++; | |
| 87 unsigned char* ujb = (unsigned char*)card_ptr; | |
| 88 int ind = (int)(*ujb); | |
| 89 _histo[ind]++; | |
| 90 *card_ptr = -1; | |
| 91 } | |
| 92 return true; | |
| 93 } | |
| 94 int calls() { return _calls; } | |
| 95 void print_histo() { | |
| 96 gclog_or_tty->print_cr("Card table value histogram:"); | |
| 97 for (int i = 0; i < 256; i++) { | |
| 98 if (_histo[i] != 0) { | |
| 99 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
| 100 } | |
| 101 } | |
| 102 } | |
| 103 }; | |
| 104 | |
| 105 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 106 int _calls; | |
| 107 G1CollectedHeap* _g1h; | |
| 108 CardTableModRefBS* _ctbs; | |
| 109 public: | |
| 110 RedirtyLoggedCardTableEntryClosure() : | |
| 111 _calls(0) | |
| 112 { | |
| 113 _g1h = G1CollectedHeap::heap(); | |
| 114 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 115 } | |
| 116 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 117 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 118 _calls++; | |
| 119 *card_ptr = 0; | |
| 120 } | |
| 121 return true; | |
| 122 } | |
| 123 int calls() { return _calls; } | |
| 124 }; | |
| 125 | |
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126 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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127 public: |
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128 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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129 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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130 return true; |
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131 } |
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132 }; |
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133 |
| 342 | 134 YoungList::YoungList(G1CollectedHeap* g1h) |
| 135 : _g1h(g1h), _head(NULL), | |
| 136 _scan_only_head(NULL), _scan_only_tail(NULL), _curr_scan_only(NULL), | |
| 137 _length(0), _scan_only_length(0), | |
| 138 _last_sampled_rs_lengths(0), | |
| 545 | 139 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) |
| 342 | 140 { |
| 141 guarantee( check_list_empty(false), "just making sure..." ); | |
| 142 } | |
| 143 | |
| 144 void YoungList::push_region(HeapRegion *hr) { | |
| 145 assert(!hr->is_young(), "should not already be young"); | |
| 146 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
| 147 | |
| 148 hr->set_next_young_region(_head); | |
| 149 _head = hr; | |
| 150 | |
| 151 hr->set_young(); | |
| 152 double yg_surv_rate = _g1h->g1_policy()->predict_yg_surv_rate((int)_length); | |
| 153 ++_length; | |
| 154 } | |
| 155 | |
| 156 void YoungList::add_survivor_region(HeapRegion* hr) { | |
| 545 | 157 assert(hr->is_survivor(), "should be flagged as survivor region"); |
| 342 | 158 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
| 159 | |
| 160 hr->set_next_young_region(_survivor_head); | |
| 161 if (_survivor_head == NULL) { | |
| 545 | 162 _survivor_tail = hr; |
| 342 | 163 } |
| 164 _survivor_head = hr; | |
| 165 | |
| 166 ++_survivor_length; | |
| 167 } | |
| 168 | |
| 169 HeapRegion* YoungList::pop_region() { | |
| 170 while (_head != NULL) { | |
| 171 assert( length() > 0, "list should not be empty" ); | |
| 172 HeapRegion* ret = _head; | |
| 173 _head = ret->get_next_young_region(); | |
| 174 ret->set_next_young_region(NULL); | |
| 175 --_length; | |
| 176 assert(ret->is_young(), "region should be very young"); | |
| 177 | |
| 178 // Replace 'Survivor' region type with 'Young'. So the region will | |
| 179 // be treated as a young region and will not be 'confused' with | |
| 180 // newly created survivor regions. | |
| 181 if (ret->is_survivor()) { | |
| 182 ret->set_young(); | |
| 183 } | |
| 184 | |
| 185 if (!ret->is_scan_only()) { | |
| 186 return ret; | |
| 187 } | |
| 188 | |
| 189 // scan-only, we'll add it to the scan-only list | |
| 190 if (_scan_only_tail == NULL) { | |
| 191 guarantee( _scan_only_head == NULL, "invariant" ); | |
| 192 | |
| 193 _scan_only_head = ret; | |
| 194 _curr_scan_only = ret; | |
| 195 } else { | |
| 196 guarantee( _scan_only_head != NULL, "invariant" ); | |
| 197 _scan_only_tail->set_next_young_region(ret); | |
| 198 } | |
| 199 guarantee( ret->get_next_young_region() == NULL, "invariant" ); | |
| 200 _scan_only_tail = ret; | |
| 201 | |
| 202 // no need to be tagged as scan-only any more | |
| 203 ret->set_young(); | |
| 204 | |
| 205 ++_scan_only_length; | |
| 206 } | |
| 207 assert( length() == 0, "list should be empty" ); | |
| 208 return NULL; | |
| 209 } | |
| 210 | |
| 211 void YoungList::empty_list(HeapRegion* list) { | |
| 212 while (list != NULL) { | |
| 213 HeapRegion* next = list->get_next_young_region(); | |
| 214 list->set_next_young_region(NULL); | |
| 215 list->uninstall_surv_rate_group(); | |
| 216 list->set_not_young(); | |
| 217 list = next; | |
| 218 } | |
| 219 } | |
| 220 | |
| 221 void YoungList::empty_list() { | |
| 222 assert(check_list_well_formed(), "young list should be well formed"); | |
| 223 | |
| 224 empty_list(_head); | |
| 225 _head = NULL; | |
| 226 _length = 0; | |
| 227 | |
| 228 empty_list(_scan_only_head); | |
| 229 _scan_only_head = NULL; | |
| 230 _scan_only_tail = NULL; | |
| 231 _scan_only_length = 0; | |
| 232 _curr_scan_only = NULL; | |
| 233 | |
| 234 empty_list(_survivor_head); | |
| 235 _survivor_head = NULL; | |
| 545 | 236 _survivor_tail = NULL; |
| 342 | 237 _survivor_length = 0; |
| 238 | |
| 239 _last_sampled_rs_lengths = 0; | |
| 240 | |
| 241 assert(check_list_empty(false), "just making sure..."); | |
| 242 } | |
| 243 | |
| 244 bool YoungList::check_list_well_formed() { | |
| 245 bool ret = true; | |
| 246 | |
| 247 size_t length = 0; | |
| 248 HeapRegion* curr = _head; | |
| 249 HeapRegion* last = NULL; | |
| 250 while (curr != NULL) { | |
| 251 if (!curr->is_young() || curr->is_scan_only()) { | |
| 252 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " | |
| 253 "incorrectly tagged (%d, %d)", | |
| 254 curr->bottom(), curr->end(), | |
| 255 curr->is_young(), curr->is_scan_only()); | |
| 256 ret = false; | |
| 257 } | |
| 258 ++length; | |
| 259 last = curr; | |
| 260 curr = curr->get_next_young_region(); | |
| 261 } | |
| 262 ret = ret && (length == _length); | |
| 263 | |
| 264 if (!ret) { | |
| 265 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
| 266 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
| 267 length, _length); | |
| 268 } | |
| 269 | |
| 270 bool scan_only_ret = true; | |
| 271 length = 0; | |
| 272 curr = _scan_only_head; | |
| 273 last = NULL; | |
| 274 while (curr != NULL) { | |
| 275 if (!curr->is_young() || curr->is_scan_only()) { | |
| 276 gclog_or_tty->print_cr("### SCAN-ONLY REGION "PTR_FORMAT"-"PTR_FORMAT" " | |
| 277 "incorrectly tagged (%d, %d)", | |
| 278 curr->bottom(), curr->end(), | |
| 279 curr->is_young(), curr->is_scan_only()); | |
| 280 scan_only_ret = false; | |
| 281 } | |
| 282 ++length; | |
| 283 last = curr; | |
| 284 curr = curr->get_next_young_region(); | |
| 285 } | |
| 286 scan_only_ret = scan_only_ret && (length == _scan_only_length); | |
| 287 | |
| 288 if ( (last != _scan_only_tail) || | |
| 289 (_scan_only_head == NULL && _scan_only_tail != NULL) || | |
| 290 (_scan_only_head != NULL && _scan_only_tail == NULL) ) { | |
| 291 gclog_or_tty->print_cr("## _scan_only_tail is set incorrectly"); | |
| 292 scan_only_ret = false; | |
| 293 } | |
| 294 | |
| 295 if (_curr_scan_only != NULL && _curr_scan_only != _scan_only_head) { | |
| 296 gclog_or_tty->print_cr("### _curr_scan_only is set incorrectly"); | |
| 297 scan_only_ret = false; | |
| 298 } | |
| 299 | |
| 300 if (!scan_only_ret) { | |
| 301 gclog_or_tty->print_cr("### SCAN-ONLY LIST seems not well formed!"); | |
| 302 gclog_or_tty->print_cr("### list has %d entries, _scan_only_length is %d", | |
| 303 length, _scan_only_length); | |
| 304 } | |
| 305 | |
| 306 return ret && scan_only_ret; | |
| 307 } | |
| 308 | |
| 309 bool YoungList::check_list_empty(bool ignore_scan_only_list, | |
| 310 bool check_sample) { | |
| 311 bool ret = true; | |
| 312 | |
| 313 if (_length != 0) { | |
| 314 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
| 315 _length); | |
| 316 ret = false; | |
| 317 } | |
| 318 if (check_sample && _last_sampled_rs_lengths != 0) { | |
| 319 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
| 320 ret = false; | |
| 321 } | |
| 322 if (_head != NULL) { | |
| 323 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
| 324 ret = false; | |
| 325 } | |
| 326 if (!ret) { | |
| 327 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
| 328 } | |
| 329 | |
| 330 if (ignore_scan_only_list) | |
| 331 return ret; | |
| 332 | |
| 333 bool scan_only_ret = true; | |
| 334 if (_scan_only_length != 0) { | |
| 335 gclog_or_tty->print_cr("### SCAN-ONLY LIST should have 0 length, not %d", | |
| 336 _scan_only_length); | |
| 337 scan_only_ret = false; | |
| 338 } | |
| 339 if (_scan_only_head != NULL) { | |
| 340 gclog_or_tty->print_cr("### SCAN-ONLY LIST does not have a NULL head"); | |
| 341 scan_only_ret = false; | |
| 342 } | |
| 343 if (_scan_only_tail != NULL) { | |
| 344 gclog_or_tty->print_cr("### SCAN-ONLY LIST does not have a NULL tail"); | |
| 345 scan_only_ret = false; | |
| 346 } | |
| 347 if (!scan_only_ret) { | |
| 348 gclog_or_tty->print_cr("### SCAN-ONLY LIST does not seem empty"); | |
| 349 } | |
| 350 | |
| 351 return ret && scan_only_ret; | |
| 352 } | |
| 353 | |
| 354 void | |
| 355 YoungList::rs_length_sampling_init() { | |
| 356 _sampled_rs_lengths = 0; | |
| 357 _curr = _head; | |
| 358 } | |
| 359 | |
| 360 bool | |
| 361 YoungList::rs_length_sampling_more() { | |
| 362 return _curr != NULL; | |
| 363 } | |
| 364 | |
| 365 void | |
| 366 YoungList::rs_length_sampling_next() { | |
| 367 assert( _curr != NULL, "invariant" ); | |
| 368 _sampled_rs_lengths += _curr->rem_set()->occupied(); | |
| 369 _curr = _curr->get_next_young_region(); | |
| 370 if (_curr == NULL) { | |
| 371 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
| 372 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
| 373 } | |
| 374 } | |
| 375 | |
| 376 void | |
| 377 YoungList::reset_auxilary_lists() { | |
| 378 // We could have just "moved" the scan-only list to the young list. | |
| 379 // However, the scan-only list is ordered according to the region | |
| 380 // age in descending order, so, by moving one entry at a time, we | |
| 381 // ensure that it is recreated in ascending order. | |
| 382 | |
| 383 guarantee( is_empty(), "young list should be empty" ); | |
| 384 assert(check_list_well_formed(), "young list should be well formed"); | |
| 385 | |
| 386 // Add survivor regions to SurvRateGroup. | |
| 387 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
| 545 | 388 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
| 342 | 389 for (HeapRegion* curr = _survivor_head; |
| 390 curr != NULL; | |
| 391 curr = curr->get_next_young_region()) { | |
| 392 _g1h->g1_policy()->set_region_survivors(curr); | |
| 393 } | |
| 394 _g1h->g1_policy()->note_stop_adding_survivor_regions(); | |
| 395 | |
| 396 if (_survivor_head != NULL) { | |
| 397 _head = _survivor_head; | |
| 398 _length = _survivor_length + _scan_only_length; | |
| 545 | 399 _survivor_tail->set_next_young_region(_scan_only_head); |
| 342 | 400 } else { |
| 401 _head = _scan_only_head; | |
| 402 _length = _scan_only_length; | |
| 403 } | |
| 404 | |
| 405 for (HeapRegion* curr = _scan_only_head; | |
| 406 curr != NULL; | |
| 407 curr = curr->get_next_young_region()) { | |
| 408 curr->recalculate_age_in_surv_rate_group(); | |
| 409 } | |
| 410 _scan_only_head = NULL; | |
| 411 _scan_only_tail = NULL; | |
| 412 _scan_only_length = 0; | |
| 413 _curr_scan_only = NULL; | |
| 414 | |
| 415 _survivor_head = NULL; | |
| 545 | 416 _survivor_tail = NULL; |
| 342 | 417 _survivor_length = 0; |
| 545 | 418 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
| 342 | 419 |
| 420 assert(check_list_well_formed(), "young list should be well formed"); | |
| 421 } | |
| 422 | |
| 423 void YoungList::print() { | |
| 424 HeapRegion* lists[] = {_head, _scan_only_head, _survivor_head}; | |
| 425 const char* names[] = {"YOUNG", "SCAN-ONLY", "SURVIVOR"}; | |
| 426 | |
| 427 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
| 428 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
| 429 HeapRegion *curr = lists[list]; | |
| 430 if (curr == NULL) | |
| 431 gclog_or_tty->print_cr(" empty"); | |
| 432 while (curr != NULL) { | |
| 433 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
| 434 "age: %4d, y: %d, s-o: %d, surv: %d", | |
| 435 curr->bottom(), curr->end(), | |
| 436 curr->top(), | |
| 437 curr->prev_top_at_mark_start(), | |
| 438 curr->next_top_at_mark_start(), | |
| 439 curr->top_at_conc_mark_count(), | |
| 440 curr->age_in_surv_rate_group_cond(), | |
| 441 curr->is_young(), | |
| 442 curr->is_scan_only(), | |
| 443 curr->is_survivor()); | |
| 444 curr = curr->get_next_young_region(); | |
| 445 } | |
| 446 } | |
| 447 | |
| 448 gclog_or_tty->print_cr(""); | |
| 449 } | |
| 450 | |
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451 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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452 { |
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453 // Claim the right to put the region on the dirty cards region list |
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454 // by installing a self pointer. |
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455 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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456 if (next == NULL) { |
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457 HeapRegion* res = (HeapRegion*) |
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458 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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459 NULL); |
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460 if (res == NULL) { |
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461 HeapRegion* head; |
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462 do { |
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463 // Put the region to the dirty cards region list. |
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464 head = _dirty_cards_region_list; |
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465 next = (HeapRegion*) |
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466 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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467 if (next == head) { |
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468 assert(hr->get_next_dirty_cards_region() == hr, |
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469 "hr->get_next_dirty_cards_region() != hr"); |
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470 if (next == NULL) { |
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471 // The last region in the list points to itself. |
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472 hr->set_next_dirty_cards_region(hr); |
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473 } else { |
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474 hr->set_next_dirty_cards_region(next); |
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475 } |
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476 } |
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477 } while (next != head); |
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478 } |
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479 } |
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480 } |
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481 |
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482 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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483 { |
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484 HeapRegion* head; |
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485 HeapRegion* hr; |
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486 do { |
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487 head = _dirty_cards_region_list; |
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488 if (head == NULL) { |
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489 return NULL; |
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490 } |
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491 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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492 if (head == new_head) { |
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493 // The last region. |
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494 new_head = NULL; |
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495 } |
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496 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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497 head); |
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498 } while (hr != head); |
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499 assert(hr != NULL, "invariant"); |
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500 hr->set_next_dirty_cards_region(NULL); |
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501 return hr; |
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502 } |
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503 |
| 342 | 504 void G1CollectedHeap::stop_conc_gc_threads() { |
| 794 | 505 _cg1r->stop(); |
| 342 | 506 _czft->stop(); |
| 507 _cmThread->stop(); | |
| 508 } | |
| 509 | |
| 510 | |
| 511 void G1CollectedHeap::check_ct_logs_at_safepoint() { | |
| 512 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 513 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
| 514 | |
| 515 // Count the dirty cards at the start. | |
| 516 CountNonCleanMemRegionClosure count1(this); | |
| 517 ct_bs->mod_card_iterate(&count1); | |
| 518 int orig_count = count1.n(); | |
| 519 | |
| 520 // First clear the logged cards. | |
| 521 ClearLoggedCardTableEntryClosure clear; | |
| 522 dcqs.set_closure(&clear); | |
| 523 dcqs.apply_closure_to_all_completed_buffers(); | |
| 524 dcqs.iterate_closure_all_threads(false); | |
| 525 clear.print_histo(); | |
| 526 | |
| 527 // Now ensure that there's no dirty cards. | |
| 528 CountNonCleanMemRegionClosure count2(this); | |
| 529 ct_bs->mod_card_iterate(&count2); | |
| 530 if (count2.n() != 0) { | |
| 531 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
| 532 count2.n(), orig_count); | |
| 533 } | |
| 534 guarantee(count2.n() == 0, "Card table should be clean."); | |
| 535 | |
| 536 RedirtyLoggedCardTableEntryClosure redirty; | |
| 537 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
| 538 dcqs.apply_closure_to_all_completed_buffers(); | |
| 539 dcqs.iterate_closure_all_threads(false); | |
| 540 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
| 541 clear.calls(), orig_count); | |
| 542 guarantee(redirty.calls() == clear.calls(), | |
| 543 "Or else mechanism is broken."); | |
| 544 | |
| 545 CountNonCleanMemRegionClosure count3(this); | |
| 546 ct_bs->mod_card_iterate(&count3); | |
| 547 if (count3.n() != orig_count) { | |
| 548 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
| 549 orig_count, count3.n()); | |
| 550 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
| 551 } | |
| 552 | |
| 553 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 554 } | |
| 555 | |
| 556 // Private class members. | |
| 557 | |
| 558 G1CollectedHeap* G1CollectedHeap::_g1h; | |
| 559 | |
| 560 // Private methods. | |
| 561 | |
| 562 // Finds a HeapRegion that can be used to allocate a given size of block. | |
| 563 | |
| 564 | |
| 565 HeapRegion* G1CollectedHeap::newAllocRegion_work(size_t word_size, | |
| 566 bool do_expand, | |
| 567 bool zero_filled) { | |
| 568 ConcurrentZFThread::note_region_alloc(); | |
| 569 HeapRegion* res = alloc_free_region_from_lists(zero_filled); | |
| 570 if (res == NULL && do_expand) { | |
| 571 expand(word_size * HeapWordSize); | |
| 572 res = alloc_free_region_from_lists(zero_filled); | |
| 573 assert(res == NULL || | |
| 574 (!res->isHumongous() && | |
| 575 (!zero_filled || | |
| 576 res->zero_fill_state() == HeapRegion::Allocated)), | |
| 577 "Alloc Regions must be zero filled (and non-H)"); | |
| 578 } | |
| 579 if (res != NULL && res->is_empty()) _free_regions--; | |
| 580 assert(res == NULL || | |
| 581 (!res->isHumongous() && | |
| 582 (!zero_filled || | |
| 583 res->zero_fill_state() == HeapRegion::Allocated)), | |
| 584 "Non-young alloc Regions must be zero filled (and non-H)"); | |
| 585 | |
| 751 | 586 if (G1PrintRegions) { |
| 342 | 587 if (res != NULL) { |
| 588 gclog_or_tty->print_cr("new alloc region %d:["PTR_FORMAT", "PTR_FORMAT"], " | |
| 589 "top "PTR_FORMAT, | |
| 590 res->hrs_index(), res->bottom(), res->end(), res->top()); | |
| 591 } | |
| 592 } | |
| 593 | |
| 594 return res; | |
| 595 } | |
| 596 | |
| 597 HeapRegion* G1CollectedHeap::newAllocRegionWithExpansion(int purpose, | |
| 598 size_t word_size, | |
| 599 bool zero_filled) { | |
| 600 HeapRegion* alloc_region = NULL; | |
| 601 if (_gc_alloc_region_counts[purpose] < g1_policy()->max_regions(purpose)) { | |
| 602 alloc_region = newAllocRegion_work(word_size, true, zero_filled); | |
| 603 if (purpose == GCAllocForSurvived && alloc_region != NULL) { | |
| 545 | 604 alloc_region->set_survivor(); |
| 342 | 605 } |
| 606 ++_gc_alloc_region_counts[purpose]; | |
| 607 } else { | |
| 608 g1_policy()->note_alloc_region_limit_reached(purpose); | |
| 609 } | |
| 610 return alloc_region; | |
| 611 } | |
| 612 | |
| 613 // If could fit into free regions w/o expansion, try. | |
| 614 // Otherwise, if can expand, do so. | |
| 615 // Otherwise, if using ex regions might help, try with ex given back. | |
| 616 HeapWord* G1CollectedHeap::humongousObjAllocate(size_t word_size) { | |
| 617 assert(regions_accounted_for(), "Region leakage!"); | |
| 618 | |
| 619 // We can't allocate H regions while cleanupComplete is running, since | |
| 620 // some of the regions we find to be empty might not yet be added to the | |
| 621 // unclean list. (If we're already at a safepoint, this call is | |
| 622 // unnecessary, not to mention wrong.) | |
| 623 if (!SafepointSynchronize::is_at_safepoint()) | |
| 624 wait_for_cleanup_complete(); | |
| 625 | |
| 626 size_t num_regions = | |
| 627 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; | |
| 628 | |
| 629 // Special case if < one region??? | |
| 630 | |
| 631 // Remember the ft size. | |
| 632 size_t x_size = expansion_regions(); | |
| 633 | |
| 634 HeapWord* res = NULL; | |
| 635 bool eliminated_allocated_from_lists = false; | |
| 636 | |
| 637 // Can the allocation potentially fit in the free regions? | |
| 638 if (free_regions() >= num_regions) { | |
| 639 res = _hrs->obj_allocate(word_size); | |
| 640 } | |
| 641 if (res == NULL) { | |
| 642 // Try expansion. | |
| 643 size_t fs = _hrs->free_suffix(); | |
| 644 if (fs + x_size >= num_regions) { | |
| 645 expand((num_regions - fs) * HeapRegion::GrainBytes); | |
| 646 res = _hrs->obj_allocate(word_size); | |
| 647 assert(res != NULL, "This should have worked."); | |
| 648 } else { | |
| 649 // Expansion won't help. Are there enough free regions if we get rid | |
| 650 // of reservations? | |
| 651 size_t avail = free_regions(); | |
| 652 if (avail >= num_regions) { | |
| 653 res = _hrs->obj_allocate(word_size); | |
| 654 if (res != NULL) { | |
| 655 remove_allocated_regions_from_lists(); | |
| 656 eliminated_allocated_from_lists = true; | |
| 657 } | |
| 658 } | |
| 659 } | |
| 660 } | |
| 661 if (res != NULL) { | |
| 662 // Increment by the number of regions allocated. | |
| 663 // FIXME: Assumes regions all of size GrainBytes. | |
| 664 #ifndef PRODUCT | |
| 665 mr_bs()->verify_clean_region(MemRegion(res, res + num_regions * | |
| 666 HeapRegion::GrainWords)); | |
| 667 #endif | |
| 668 if (!eliminated_allocated_from_lists) | |
| 669 remove_allocated_regions_from_lists(); | |
| 670 _summary_bytes_used += word_size * HeapWordSize; | |
| 671 _free_regions -= num_regions; | |
| 672 _num_humongous_regions += (int) num_regions; | |
| 673 } | |
| 674 assert(regions_accounted_for(), "Region Leakage"); | |
| 675 return res; | |
| 676 } | |
| 677 | |
| 678 HeapWord* | |
| 679 G1CollectedHeap::attempt_allocation_slow(size_t word_size, | |
| 680 bool permit_collection_pause) { | |
| 681 HeapWord* res = NULL; | |
| 682 HeapRegion* allocated_young_region = NULL; | |
| 683 | |
| 684 assert( SafepointSynchronize::is_at_safepoint() || | |
| 685 Heap_lock->owned_by_self(), "pre condition of the call" ); | |
| 686 | |
| 687 if (isHumongous(word_size)) { | |
| 688 // Allocation of a humongous object can, in a sense, complete a | |
| 689 // partial region, if the previous alloc was also humongous, and | |
| 690 // caused the test below to succeed. | |
| 691 if (permit_collection_pause) | |
| 692 do_collection_pause_if_appropriate(word_size); | |
| 693 res = humongousObjAllocate(word_size); | |
| 694 assert(_cur_alloc_region == NULL | |
| 695 || !_cur_alloc_region->isHumongous(), | |
| 696 "Prevent a regression of this bug."); | |
| 697 | |
| 698 } else { | |
|
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699 // We may have concurrent cleanup working at the time. Wait for it |
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700 // to complete. In the future we would probably want to make the |
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701 // concurrent cleanup truly concurrent by decoupling it from the |
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702 // allocation. |
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703 if (!SafepointSynchronize::is_at_safepoint()) |
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704 wait_for_cleanup_complete(); |
| 342 | 705 // If we do a collection pause, this will be reset to a non-NULL |
| 706 // value. If we don't, nulling here ensures that we allocate a new | |
| 707 // region below. | |
| 708 if (_cur_alloc_region != NULL) { | |
| 709 // We're finished with the _cur_alloc_region. | |
| 710 _summary_bytes_used += _cur_alloc_region->used(); | |
| 711 _cur_alloc_region = NULL; | |
| 712 } | |
| 713 assert(_cur_alloc_region == NULL, "Invariant."); | |
| 714 // Completion of a heap region is perhaps a good point at which to do | |
| 715 // a collection pause. | |
| 716 if (permit_collection_pause) | |
| 717 do_collection_pause_if_appropriate(word_size); | |
| 718 // Make sure we have an allocation region available. | |
| 719 if (_cur_alloc_region == NULL) { | |
| 720 if (!SafepointSynchronize::is_at_safepoint()) | |
| 721 wait_for_cleanup_complete(); | |
| 722 bool next_is_young = should_set_young_locked(); | |
| 723 // If the next region is not young, make sure it's zero-filled. | |
| 724 _cur_alloc_region = newAllocRegion(word_size, !next_is_young); | |
| 725 if (_cur_alloc_region != NULL) { | |
| 726 _summary_bytes_used -= _cur_alloc_region->used(); | |
| 727 if (next_is_young) { | |
| 728 set_region_short_lived_locked(_cur_alloc_region); | |
| 729 allocated_young_region = _cur_alloc_region; | |
| 730 } | |
| 731 } | |
| 732 } | |
| 733 assert(_cur_alloc_region == NULL || !_cur_alloc_region->isHumongous(), | |
| 734 "Prevent a regression of this bug."); | |
| 735 | |
| 736 // Now retry the allocation. | |
| 737 if (_cur_alloc_region != NULL) { | |
| 738 res = _cur_alloc_region->allocate(word_size); | |
| 739 } | |
| 740 } | |
| 741 | |
| 742 // NOTE: fails frequently in PRT | |
| 743 assert(regions_accounted_for(), "Region leakage!"); | |
| 744 | |
| 745 if (res != NULL) { | |
| 746 if (!SafepointSynchronize::is_at_safepoint()) { | |
| 747 assert( permit_collection_pause, "invariant" ); | |
| 748 assert( Heap_lock->owned_by_self(), "invariant" ); | |
| 749 Heap_lock->unlock(); | |
| 750 } | |
| 751 | |
| 752 if (allocated_young_region != NULL) { | |
| 753 HeapRegion* hr = allocated_young_region; | |
| 754 HeapWord* bottom = hr->bottom(); | |
| 755 HeapWord* end = hr->end(); | |
| 756 MemRegion mr(bottom, end); | |
| 757 ((CardTableModRefBS*)_g1h->barrier_set())->dirty(mr); | |
| 758 } | |
| 759 } | |
| 760 | |
| 761 assert( SafepointSynchronize::is_at_safepoint() || | |
| 762 (res == NULL && Heap_lock->owned_by_self()) || | |
| 763 (res != NULL && !Heap_lock->owned_by_self()), | |
| 764 "post condition of the call" ); | |
| 765 | |
| 766 return res; | |
| 767 } | |
| 768 | |
| 769 HeapWord* | |
| 770 G1CollectedHeap::mem_allocate(size_t word_size, | |
| 771 bool is_noref, | |
| 772 bool is_tlab, | |
| 773 bool* gc_overhead_limit_was_exceeded) { | |
| 774 debug_only(check_for_valid_allocation_state()); | |
| 775 assert(no_gc_in_progress(), "Allocation during gc not allowed"); | |
| 776 HeapWord* result = NULL; | |
| 777 | |
| 778 // Loop until the allocation is satisified, | |
| 779 // or unsatisfied after GC. | |
| 780 for (int try_count = 1; /* return or throw */; try_count += 1) { | |
| 781 int gc_count_before; | |
| 782 { | |
| 783 Heap_lock->lock(); | |
| 784 result = attempt_allocation(word_size); | |
| 785 if (result != NULL) { | |
| 786 // attempt_allocation should have unlocked the heap lock | |
| 787 assert(is_in(result), "result not in heap"); | |
| 788 return result; | |
| 789 } | |
| 790 // Read the gc count while the heap lock is held. | |
| 791 gc_count_before = SharedHeap::heap()->total_collections(); | |
| 792 Heap_lock->unlock(); | |
| 793 } | |
| 794 | |
| 795 // Create the garbage collection operation... | |
| 796 VM_G1CollectForAllocation op(word_size, | |
| 797 gc_count_before); | |
| 798 | |
| 799 // ...and get the VM thread to execute it. | |
| 800 VMThread::execute(&op); | |
| 801 if (op.prologue_succeeded()) { | |
| 802 result = op.result(); | |
| 803 assert(result == NULL || is_in(result), "result not in heap"); | |
| 804 return result; | |
| 805 } | |
| 806 | |
| 807 // Give a warning if we seem to be looping forever. | |
| 808 if ((QueuedAllocationWarningCount > 0) && | |
| 809 (try_count % QueuedAllocationWarningCount == 0)) { | |
| 810 warning("G1CollectedHeap::mem_allocate_work retries %d times", | |
| 811 try_count); | |
| 812 } | |
| 813 } | |
| 814 } | |
| 815 | |
| 816 void G1CollectedHeap::abandon_cur_alloc_region() { | |
| 817 if (_cur_alloc_region != NULL) { | |
| 818 // We're finished with the _cur_alloc_region. | |
| 819 if (_cur_alloc_region->is_empty()) { | |
| 820 _free_regions++; | |
| 821 free_region(_cur_alloc_region); | |
| 822 } else { | |
| 823 _summary_bytes_used += _cur_alloc_region->used(); | |
| 824 } | |
| 825 _cur_alloc_region = NULL; | |
| 826 } | |
| 827 } | |
| 828 | |
| 636 | 829 void G1CollectedHeap::abandon_gc_alloc_regions() { |
| 830 // first, make sure that the GC alloc region list is empty (it should!) | |
| 831 assert(_gc_alloc_region_list == NULL, "invariant"); | |
| 832 release_gc_alloc_regions(true /* totally */); | |
| 833 } | |
| 834 | |
| 342 | 835 class PostMCRemSetClearClosure: public HeapRegionClosure { |
| 836 ModRefBarrierSet* _mr_bs; | |
| 837 public: | |
| 838 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 839 bool doHeapRegion(HeapRegion* r) { | |
| 840 r->reset_gc_time_stamp(); | |
| 841 if (r->continuesHumongous()) | |
| 842 return false; | |
| 843 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 844 if (hrrs != NULL) hrrs->clear(); | |
| 845 // You might think here that we could clear just the cards | |
| 846 // corresponding to the used region. But no: if we leave a dirty card | |
| 847 // in a region we might allocate into, then it would prevent that card | |
| 848 // from being enqueued, and cause it to be missed. | |
| 849 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
| 850 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
| 851 return false; | |
| 852 } | |
| 853 }; | |
| 854 | |
| 855 | |
| 856 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
| 857 ModRefBarrierSet* _mr_bs; | |
| 858 public: | |
| 859 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 860 bool doHeapRegion(HeapRegion* r) { | |
| 861 if (r->continuesHumongous()) return false; | |
| 862 if (r->used_region().word_size() != 0) { | |
| 863 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
| 864 } | |
| 865 return false; | |
| 866 } | |
| 867 }; | |
| 868 | |
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869 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
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870 G1CollectedHeap* _g1h; |
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871 UpdateRSOopClosure _cl; |
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872 int _worker_i; |
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873 public: |
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874 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
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875 _cl(g1->g1_rem_set()->as_HRInto_G1RemSet(), worker_i), |
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876 _worker_i(worker_i), |
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877 _g1h(g1) |
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878 { } |
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879 bool doHeapRegion(HeapRegion* r) { |
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880 if (!r->continuesHumongous()) { |
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881 _cl.set_from(r); |
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882 r->oop_iterate(&_cl); |
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883 } |
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884 return false; |
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885 } |
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886 }; |
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887 |
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888 class ParRebuildRSTask: public AbstractGangTask { |
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889 G1CollectedHeap* _g1; |
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890 public: |
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891 ParRebuildRSTask(G1CollectedHeap* g1) |
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892 : AbstractGangTask("ParRebuildRSTask"), |
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893 _g1(g1) |
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894 { } |
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895 |
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896 void work(int i) { |
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897 RebuildRSOutOfRegionClosure rebuild_rs(_g1, i); |
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898 _g1->heap_region_par_iterate_chunked(&rebuild_rs, i, |
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899 HeapRegion::RebuildRSClaimValue); |
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900 } |
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901 }; |
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902 |
| 342 | 903 void G1CollectedHeap::do_collection(bool full, bool clear_all_soft_refs, |
| 904 size_t word_size) { | |
| 905 ResourceMark rm; | |
| 906 | |
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907 if (PrintHeapAtGC) { |
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908 Universe::print_heap_before_gc(); |
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909 } |
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910 |
| 342 | 911 if (full && DisableExplicitGC) { |
| 912 gclog_or_tty->print("\n\n\nDisabling Explicit GC\n\n\n"); | |
| 913 return; | |
| 914 } | |
| 915 | |
| 916 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
| 917 assert(Thread::current() == VMThread::vm_thread(), "should be in vm thread"); | |
| 918 | |
| 919 if (GC_locker::is_active()) { | |
| 920 return; // GC is disabled (e.g. JNI GetXXXCritical operation) | |
| 921 } | |
| 922 | |
| 923 { | |
| 924 IsGCActiveMark x; | |
| 925 | |
| 926 // Timing | |
| 927 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
| 928 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
| 929 TraceTime t(full ? "Full GC (System.gc())" : "Full GC", PrintGC, true, gclog_or_tty); | |
| 930 | |
| 931 double start = os::elapsedTime(); | |
| 932 g1_policy()->record_full_collection_start(); | |
| 933 | |
| 934 gc_prologue(true); | |
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935 increment_total_collections(true /* full gc */); |
| 342 | 936 |
| 937 size_t g1h_prev_used = used(); | |
| 938 assert(used() == recalculate_used(), "Should be equal"); | |
| 939 | |
| 940 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
| 941 HandleMark hm; // Discard invalid handles created during verification | |
| 942 prepare_for_verify(); | |
| 943 gclog_or_tty->print(" VerifyBeforeGC:"); | |
| 944 Universe::verify(true); | |
| 945 } | |
| 946 assert(regions_accounted_for(), "Region leakage!"); | |
| 947 | |
| 948 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 949 | |
| 950 // We want to discover references, but not process them yet. | |
| 951 // This mode is disabled in | |
| 952 // instanceRefKlass::process_discovered_references if the | |
| 953 // generation does some collection work, or | |
| 954 // instanceRefKlass::enqueue_discovered_references if the | |
| 955 // generation returns without doing any work. | |
| 956 ref_processor()->disable_discovery(); | |
| 957 ref_processor()->abandon_partial_discovery(); | |
| 958 ref_processor()->verify_no_references_recorded(); | |
| 959 | |
| 960 // Abandon current iterations of concurrent marking and concurrent | |
| 961 // refinement, if any are in progress. | |
| 962 concurrent_mark()->abort(); | |
| 963 | |
| 964 // Make sure we'll choose a new allocation region afterwards. | |
| 965 abandon_cur_alloc_region(); | |
| 636 | 966 abandon_gc_alloc_regions(); |
| 342 | 967 assert(_cur_alloc_region == NULL, "Invariant."); |
| 968 g1_rem_set()->as_HRInto_G1RemSet()->cleanupHRRS(); | |
| 969 tear_down_region_lists(); | |
| 970 set_used_regions_to_need_zero_fill(); | |
| 971 if (g1_policy()->in_young_gc_mode()) { | |
| 972 empty_young_list(); | |
| 973 g1_policy()->set_full_young_gcs(true); | |
| 974 } | |
| 975 | |
| 976 // Temporarily make reference _discovery_ single threaded (non-MT). | |
| 977 ReferenceProcessorMTMutator rp_disc_ser(ref_processor(), false); | |
| 978 | |
| 979 // Temporarily make refs discovery atomic | |
| 980 ReferenceProcessorAtomicMutator rp_disc_atomic(ref_processor(), true); | |
| 981 | |
| 982 // Temporarily clear _is_alive_non_header | |
| 983 ReferenceProcessorIsAliveMutator rp_is_alive_null(ref_processor(), NULL); | |
| 984 | |
| 985 ref_processor()->enable_discovery(); | |
|
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986 ref_processor()->setup_policy(clear_all_soft_refs); |
| 342 | 987 |
| 988 // Do collection work | |
| 989 { | |
| 990 HandleMark hm; // Discard invalid handles created during gc | |
| 991 G1MarkSweep::invoke_at_safepoint(ref_processor(), clear_all_soft_refs); | |
| 992 } | |
| 993 // Because freeing humongous regions may have added some unclean | |
| 994 // regions, it is necessary to tear down again before rebuilding. | |
| 995 tear_down_region_lists(); | |
| 996 rebuild_region_lists(); | |
| 997 | |
| 998 _summary_bytes_used = recalculate_used(); | |
| 999 | |
| 1000 ref_processor()->enqueue_discovered_references(); | |
| 1001 | |
| 1002 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 1003 | |
| 1004 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { | |
| 1005 HandleMark hm; // Discard invalid handles created during verification | |
| 1006 gclog_or_tty->print(" VerifyAfterGC:"); | |
|
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1007 prepare_for_verify(); |
| 342 | 1008 Universe::verify(false); |
| 1009 } | |
| 1010 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); | |
| 1011 | |
| 1012 reset_gc_time_stamp(); | |
| 1013 // Since everything potentially moved, we will clear all remembered | |
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1014 // sets, and clear all cards. Later we will rebuild remebered |
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1015 // sets. We will also reset the GC time stamps of the regions. |
| 342 | 1016 PostMCRemSetClearClosure rs_clear(mr_bs()); |
| 1017 heap_region_iterate(&rs_clear); | |
| 1018 | |
| 1019 // Resize the heap if necessary. | |
| 1020 resize_if_necessary_after_full_collection(full ? 0 : word_size); | |
| 1021 | |
| 1022 if (_cg1r->use_cache()) { | |
| 1023 _cg1r->clear_and_record_card_counts(); | |
| 1024 _cg1r->clear_hot_cache(); | |
| 1025 } | |
| 1026 | |
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1027 // Rebuild remembered sets of all regions. |
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1028 if (ParallelGCThreads > 0) { |
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1029 ParRebuildRSTask rebuild_rs_task(this); |
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1030 assert(check_heap_region_claim_values( |
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1031 HeapRegion::InitialClaimValue), "sanity check"); |
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1032 set_par_threads(workers()->total_workers()); |
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1033 workers()->run_task(&rebuild_rs_task); |
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1034 set_par_threads(0); |
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1035 assert(check_heap_region_claim_values( |
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1036 HeapRegion::RebuildRSClaimValue), "sanity check"); |
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1037 reset_heap_region_claim_values(); |
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1038 } else { |
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1039 RebuildRSOutOfRegionClosure rebuild_rs(this); |
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1040 heap_region_iterate(&rebuild_rs); |
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1041 } |
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1042 |
| 342 | 1043 if (PrintGC) { |
| 1044 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
| 1045 } | |
| 1046 | |
| 1047 if (true) { // FIXME | |
| 1048 // Ask the permanent generation to adjust size for full collections | |
| 1049 perm()->compute_new_size(); | |
| 1050 } | |
| 1051 | |
| 1052 double end = os::elapsedTime(); | |
| 1053 g1_policy()->record_full_collection_end(); | |
| 1054 | |
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1055 #ifdef TRACESPINNING |
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1056 ParallelTaskTerminator::print_termination_counts(); |
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1057 #endif |
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1058 |
| 342 | 1059 gc_epilogue(true); |
| 1060 | |
| 794 | 1061 // Discard all rset updates |
| 1062 JavaThread::dirty_card_queue_set().abandon_logs(); | |
|
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1063 assert(!G1DeferredRSUpdate |
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1064 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
| 342 | 1065 assert(regions_accounted_for(), "Region leakage!"); |
| 1066 } | |
| 1067 | |
| 1068 if (g1_policy()->in_young_gc_mode()) { | |
| 1069 _young_list->reset_sampled_info(); | |
| 1070 assert( check_young_list_empty(false, false), | |
| 1071 "young list should be empty at this point"); | |
| 1072 } | |
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1073 |
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1074 if (PrintHeapAtGC) { |
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1075 Universe::print_heap_after_gc(); |
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1076 } |
| 342 | 1077 } |
| 1078 | |
| 1079 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
| 1080 do_collection(true, clear_all_soft_refs, 0); | |
| 1081 } | |
| 1082 | |
| 1083 // This code is mostly copied from TenuredGeneration. | |
| 1084 void | |
| 1085 G1CollectedHeap:: | |
| 1086 resize_if_necessary_after_full_collection(size_t word_size) { | |
| 1087 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
| 1088 | |
| 1089 // Include the current allocation, if any, and bytes that will be | |
| 1090 // pre-allocated to support collections, as "used". | |
| 1091 const size_t used_after_gc = used(); | |
| 1092 const size_t capacity_after_gc = capacity(); | |
| 1093 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
| 1094 | |
| 1095 // We don't have floating point command-line arguments | |
| 1096 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100; | |
| 1097 const double maximum_used_percentage = 1.0 - minimum_free_percentage; | |
| 1098 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100; | |
| 1099 const double minimum_used_percentage = 1.0 - maximum_free_percentage; | |
| 1100 | |
| 1101 size_t minimum_desired_capacity = (size_t) (used_after_gc / maximum_used_percentage); | |
| 1102 size_t maximum_desired_capacity = (size_t) (used_after_gc / minimum_used_percentage); | |
| 1103 | |
| 1104 // Don't shrink less than the initial size. | |
| 1105 minimum_desired_capacity = | |
| 1106 MAX2(minimum_desired_capacity, | |
| 1107 collector_policy()->initial_heap_byte_size()); | |
| 1108 maximum_desired_capacity = | |
| 1109 MAX2(maximum_desired_capacity, | |
| 1110 collector_policy()->initial_heap_byte_size()); | |
| 1111 | |
| 1112 // We are failing here because minimum_desired_capacity is | |
| 1113 assert(used_after_gc <= minimum_desired_capacity, "sanity check"); | |
| 1114 assert(minimum_desired_capacity <= maximum_desired_capacity, "sanity check"); | |
| 1115 | |
| 1116 if (PrintGC && Verbose) { | |
| 1117 const double free_percentage = ((double)free_after_gc) / capacity(); | |
| 1118 gclog_or_tty->print_cr("Computing new size after full GC "); | |
| 1119 gclog_or_tty->print_cr(" " | |
| 1120 " minimum_free_percentage: %6.2f", | |
| 1121 minimum_free_percentage); | |
| 1122 gclog_or_tty->print_cr(" " | |
| 1123 " maximum_free_percentage: %6.2f", | |
| 1124 maximum_free_percentage); | |
| 1125 gclog_or_tty->print_cr(" " | |
| 1126 " capacity: %6.1fK" | |
| 1127 " minimum_desired_capacity: %6.1fK" | |
| 1128 " maximum_desired_capacity: %6.1fK", | |
| 1129 capacity() / (double) K, | |
| 1130 minimum_desired_capacity / (double) K, | |
| 1131 maximum_desired_capacity / (double) K); | |
| 1132 gclog_or_tty->print_cr(" " | |
| 1133 " free_after_gc : %6.1fK" | |
| 1134 " used_after_gc : %6.1fK", | |
| 1135 free_after_gc / (double) K, | |
| 1136 used_after_gc / (double) K); | |
| 1137 gclog_or_tty->print_cr(" " | |
| 1138 " free_percentage: %6.2f", | |
| 1139 free_percentage); | |
| 1140 } | |
| 1141 if (capacity() < minimum_desired_capacity) { | |
| 1142 // Don't expand unless it's significant | |
| 1143 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
| 1144 expand(expand_bytes); | |
| 1145 if (PrintGC && Verbose) { | |
| 1146 gclog_or_tty->print_cr(" expanding:" | |
| 1147 " minimum_desired_capacity: %6.1fK" | |
| 1148 " expand_bytes: %6.1fK", | |
| 1149 minimum_desired_capacity / (double) K, | |
| 1150 expand_bytes / (double) K); | |
| 1151 } | |
| 1152 | |
| 1153 // No expansion, now see if we want to shrink | |
| 1154 } else if (capacity() > maximum_desired_capacity) { | |
| 1155 // Capacity too large, compute shrinking size | |
| 1156 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
| 1157 shrink(shrink_bytes); | |
| 1158 if (PrintGC && Verbose) { | |
| 1159 gclog_or_tty->print_cr(" " | |
| 1160 " shrinking:" | |
| 1161 " initSize: %.1fK" | |
| 1162 " maximum_desired_capacity: %.1fK", | |
| 1163 collector_policy()->initial_heap_byte_size() / (double) K, | |
| 1164 maximum_desired_capacity / (double) K); | |
| 1165 gclog_or_tty->print_cr(" " | |
| 1166 " shrink_bytes: %.1fK", | |
| 1167 shrink_bytes / (double) K); | |
| 1168 } | |
| 1169 } | |
| 1170 } | |
| 1171 | |
| 1172 | |
| 1173 HeapWord* | |
| 1174 G1CollectedHeap::satisfy_failed_allocation(size_t word_size) { | |
| 1175 HeapWord* result = NULL; | |
| 1176 | |
| 1177 // In a G1 heap, we're supposed to keep allocation from failing by | |
| 1178 // incremental pauses. Therefore, at least for now, we'll favor | |
| 1179 // expansion over collection. (This might change in the future if we can | |
| 1180 // do something smarter than full collection to satisfy a failed alloc.) | |
| 1181 | |
| 1182 result = expand_and_allocate(word_size); | |
| 1183 if (result != NULL) { | |
| 1184 assert(is_in(result), "result not in heap"); | |
| 1185 return result; | |
| 1186 } | |
| 1187 | |
| 1188 // OK, I guess we have to try collection. | |
| 1189 | |
| 1190 do_collection(false, false, word_size); | |
| 1191 | |
| 1192 result = attempt_allocation(word_size, /*permit_collection_pause*/false); | |
| 1193 | |
| 1194 if (result != NULL) { | |
| 1195 assert(is_in(result), "result not in heap"); | |
| 1196 return result; | |
| 1197 } | |
| 1198 | |
| 1199 // Try collecting soft references. | |
| 1200 do_collection(false, true, word_size); | |
| 1201 result = attempt_allocation(word_size, /*permit_collection_pause*/false); | |
| 1202 if (result != NULL) { | |
| 1203 assert(is_in(result), "result not in heap"); | |
| 1204 return result; | |
| 1205 } | |
| 1206 | |
| 1207 // What else? We might try synchronous finalization later. If the total | |
| 1208 // space available is large enough for the allocation, then a more | |
| 1209 // complete compaction phase than we've tried so far might be | |
| 1210 // appropriate. | |
| 1211 return NULL; | |
| 1212 } | |
| 1213 | |
| 1214 // Attempting to expand the heap sufficiently | |
| 1215 // to support an allocation of the given "word_size". If | |
| 1216 // successful, perform the allocation and return the address of the | |
| 1217 // allocated block, or else "NULL". | |
| 1218 | |
| 1219 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
| 1220 size_t expand_bytes = word_size * HeapWordSize; | |
| 1221 if (expand_bytes < MinHeapDeltaBytes) { | |
| 1222 expand_bytes = MinHeapDeltaBytes; | |
| 1223 } | |
| 1224 expand(expand_bytes); | |
| 1225 assert(regions_accounted_for(), "Region leakage!"); | |
| 1226 HeapWord* result = attempt_allocation(word_size, false /* permit_collection_pause */); | |
| 1227 return result; | |
| 1228 } | |
| 1229 | |
| 1230 size_t G1CollectedHeap::free_region_if_totally_empty(HeapRegion* hr) { | |
| 1231 size_t pre_used = 0; | |
| 1232 size_t cleared_h_regions = 0; | |
| 1233 size_t freed_regions = 0; | |
| 1234 UncleanRegionList local_list; | |
| 1235 free_region_if_totally_empty_work(hr, pre_used, cleared_h_regions, | |
| 1236 freed_regions, &local_list); | |
| 1237 | |
| 1238 finish_free_region_work(pre_used, cleared_h_regions, freed_regions, | |
| 1239 &local_list); | |
| 1240 return pre_used; | |
| 1241 } | |
| 1242 | |
| 1243 void | |
| 1244 G1CollectedHeap::free_region_if_totally_empty_work(HeapRegion* hr, | |
| 1245 size_t& pre_used, | |
| 1246 size_t& cleared_h, | |
| 1247 size_t& freed_regions, | |
| 1248 UncleanRegionList* list, | |
| 1249 bool par) { | |
| 1250 assert(!hr->continuesHumongous(), "should have filtered these out"); | |
| 1251 size_t res = 0; | |
| 677 | 1252 if (hr->used() > 0 && hr->garbage_bytes() == hr->used() && |
| 1253 !hr->is_young()) { | |
| 1254 if (G1PolicyVerbose > 0) | |
| 1255 gclog_or_tty->print_cr("Freeing empty region "PTR_FORMAT "(" SIZE_FORMAT " bytes)" | |
| 1256 " during cleanup", hr, hr->used()); | |
| 1257 free_region_work(hr, pre_used, cleared_h, freed_regions, list, par); | |
| 342 | 1258 } |
| 1259 } | |
| 1260 | |
| 1261 // FIXME: both this and shrink could probably be more efficient by | |
| 1262 // doing one "VirtualSpace::expand_by" call rather than several. | |
| 1263 void G1CollectedHeap::expand(size_t expand_bytes) { | |
| 1264 size_t old_mem_size = _g1_storage.committed_size(); | |
| 1265 // We expand by a minimum of 1K. | |
| 1266 expand_bytes = MAX2(expand_bytes, (size_t)K); | |
| 1267 size_t aligned_expand_bytes = | |
| 1268 ReservedSpace::page_align_size_up(expand_bytes); | |
| 1269 aligned_expand_bytes = align_size_up(aligned_expand_bytes, | |
| 1270 HeapRegion::GrainBytes); | |
| 1271 expand_bytes = aligned_expand_bytes; | |
| 1272 while (expand_bytes > 0) { | |
| 1273 HeapWord* base = (HeapWord*)_g1_storage.high(); | |
| 1274 // Commit more storage. | |
| 1275 bool successful = _g1_storage.expand_by(HeapRegion::GrainBytes); | |
| 1276 if (!successful) { | |
| 1277 expand_bytes = 0; | |
| 1278 } else { | |
| 1279 expand_bytes -= HeapRegion::GrainBytes; | |
| 1280 // Expand the committed region. | |
| 1281 HeapWord* high = (HeapWord*) _g1_storage.high(); | |
| 1282 _g1_committed.set_end(high); | |
| 1283 // Create a new HeapRegion. | |
| 1284 MemRegion mr(base, high); | |
| 1285 bool is_zeroed = !_g1_max_committed.contains(base); | |
| 1286 HeapRegion* hr = new HeapRegion(_bot_shared, mr, is_zeroed); | |
| 1287 | |
| 1288 // Now update max_committed if necessary. | |
| 1289 _g1_max_committed.set_end(MAX2(_g1_max_committed.end(), high)); | |
| 1290 | |
| 1291 // Add it to the HeapRegionSeq. | |
| 1292 _hrs->insert(hr); | |
| 1293 // Set the zero-fill state, according to whether it's already | |
| 1294 // zeroed. | |
| 1295 { | |
| 1296 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 1297 if (is_zeroed) { | |
| 1298 hr->set_zero_fill_complete(); | |
| 1299 put_free_region_on_list_locked(hr); | |
| 1300 } else { | |
| 1301 hr->set_zero_fill_needed(); | |
| 1302 put_region_on_unclean_list_locked(hr); | |
| 1303 } | |
| 1304 } | |
| 1305 _free_regions++; | |
| 1306 // And we used up an expansion region to create it. | |
| 1307 _expansion_regions--; | |
| 1308 // Tell the cardtable about it. | |
| 1309 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
| 1310 // And the offset table as well. | |
| 1311 _bot_shared->resize(_g1_committed.word_size()); | |
| 1312 } | |
| 1313 } | |
| 1314 if (Verbose && PrintGC) { | |
| 1315 size_t new_mem_size = _g1_storage.committed_size(); | |
| 1316 gclog_or_tty->print_cr("Expanding garbage-first heap from %ldK by %ldK to %ldK", | |
| 1317 old_mem_size/K, aligned_expand_bytes/K, | |
| 1318 new_mem_size/K); | |
| 1319 } | |
| 1320 } | |
| 1321 | |
| 1322 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) | |
| 1323 { | |
| 1324 size_t old_mem_size = _g1_storage.committed_size(); | |
| 1325 size_t aligned_shrink_bytes = | |
| 1326 ReservedSpace::page_align_size_down(shrink_bytes); | |
| 1327 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
| 1328 HeapRegion::GrainBytes); | |
| 1329 size_t num_regions_deleted = 0; | |
| 1330 MemRegion mr = _hrs->shrink_by(aligned_shrink_bytes, num_regions_deleted); | |
| 1331 | |
| 1332 assert(mr.end() == (HeapWord*)_g1_storage.high(), "Bad shrink!"); | |
| 1333 if (mr.byte_size() > 0) | |
| 1334 _g1_storage.shrink_by(mr.byte_size()); | |
| 1335 assert(mr.start() == (HeapWord*)_g1_storage.high(), "Bad shrink!"); | |
| 1336 | |
| 1337 _g1_committed.set_end(mr.start()); | |
| 1338 _free_regions -= num_regions_deleted; | |
| 1339 _expansion_regions += num_regions_deleted; | |
| 1340 | |
| 1341 // Tell the cardtable about it. | |
| 1342 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
| 1343 | |
| 1344 // And the offset table as well. | |
| 1345 _bot_shared->resize(_g1_committed.word_size()); | |
| 1346 | |
| 1347 HeapRegionRemSet::shrink_heap(n_regions()); | |
| 1348 | |
| 1349 if (Verbose && PrintGC) { | |
| 1350 size_t new_mem_size = _g1_storage.committed_size(); | |
| 1351 gclog_or_tty->print_cr("Shrinking garbage-first heap from %ldK by %ldK to %ldK", | |
| 1352 old_mem_size/K, aligned_shrink_bytes/K, | |
| 1353 new_mem_size/K); | |
| 1354 } | |
| 1355 } | |
| 1356 | |
| 1357 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
| 636 | 1358 release_gc_alloc_regions(true /* totally */); |
| 342 | 1359 tear_down_region_lists(); // We will rebuild them in a moment. |
| 1360 shrink_helper(shrink_bytes); | |
| 1361 rebuild_region_lists(); | |
| 1362 } | |
| 1363 | |
| 1364 // Public methods. | |
| 1365 | |
| 1366 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 1367 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 1368 #endif // _MSC_VER | |
| 1369 | |
| 1370 | |
| 1371 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
| 1372 SharedHeap(policy_), | |
| 1373 _g1_policy(policy_), | |
| 1374 _ref_processor(NULL), | |
| 1375 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), | |
| 1376 _bot_shared(NULL), | |
| 1377 _par_alloc_during_gc_lock(Mutex::leaf, "par alloc during GC lock"), | |
| 1378 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
| 1379 _evac_failure_scan_stack(NULL) , | |
| 1380 _mark_in_progress(false), | |
| 1381 _cg1r(NULL), _czft(NULL), _summary_bytes_used(0), | |
| 1382 _cur_alloc_region(NULL), | |
| 1383 _refine_cte_cl(NULL), | |
| 1384 _free_region_list(NULL), _free_region_list_size(0), | |
| 1385 _free_regions(0), | |
| 1386 _full_collection(false), | |
| 1387 _unclean_region_list(), | |
| 1388 _unclean_regions_coming(false), | |
| 1389 _young_list(new YoungList(this)), | |
| 1390 _gc_time_stamp(0), | |
| 526 | 1391 _surviving_young_words(NULL), |
| 1392 _in_cset_fast_test(NULL), | |
|
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1393 _in_cset_fast_test_base(NULL), |
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1394 _dirty_cards_region_list(NULL) { |
| 342 | 1395 _g1h = this; // To catch bugs. |
| 1396 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
| 1397 vm_exit_during_initialization("Failed necessary allocation."); | |
| 1398 } | |
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1399 |
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1400 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1401 |
| 342 | 1402 int n_queues = MAX2((int)ParallelGCThreads, 1); |
| 1403 _task_queues = new RefToScanQueueSet(n_queues); | |
| 1404 | |
| 1405 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
| 1406 assert(n_rem_sets > 0, "Invariant."); | |
| 1407 | |
| 1408 HeapRegionRemSetIterator** iter_arr = | |
| 1409 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
| 1410 for (int i = 0; i < n_queues; i++) { | |
| 1411 iter_arr[i] = new HeapRegionRemSetIterator(); | |
| 1412 } | |
| 1413 _rem_set_iterator = iter_arr; | |
| 1414 | |
| 1415 for (int i = 0; i < n_queues; i++) { | |
| 1416 RefToScanQueue* q = new RefToScanQueue(); | |
| 1417 q->initialize(); | |
| 1418 _task_queues->register_queue(i, q); | |
| 1419 } | |
| 1420 | |
| 1421 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 636 | 1422 _gc_alloc_regions[ap] = NULL; |
| 1423 _gc_alloc_region_counts[ap] = 0; | |
| 1424 _retained_gc_alloc_regions[ap] = NULL; | |
| 1425 // by default, we do not retain a GC alloc region for each ap; | |
| 1426 // we'll override this, when appropriate, below | |
| 1427 _retain_gc_alloc_region[ap] = false; | |
| 1428 } | |
| 1429 | |
| 1430 // We will try to remember the last half-full tenured region we | |
| 1431 // allocated to at the end of a collection so that we can re-use it | |
| 1432 // during the next collection. | |
| 1433 _retain_gc_alloc_region[GCAllocForTenured] = true; | |
| 1434 | |
| 342 | 1435 guarantee(_task_queues != NULL, "task_queues allocation failure."); |
| 1436 } | |
| 1437 | |
| 1438 jint G1CollectedHeap::initialize() { | |
| 1439 os::enable_vtime(); | |
| 1440 | |
| 1441 // Necessary to satisfy locking discipline assertions. | |
| 1442 | |
| 1443 MutexLocker x(Heap_lock); | |
| 1444 | |
| 1445 // While there are no constraints in the GC code that HeapWordSize | |
| 1446 // be any particular value, there are multiple other areas in the | |
| 1447 // system which believe this to be true (e.g. oop->object_size in some | |
| 1448 // cases incorrectly returns the size in wordSize units rather than | |
| 1449 // HeapWordSize). | |
| 1450 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
| 1451 | |
| 1452 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
| 1453 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
| 1454 | |
| 1455 // Ensure that the sizes are properly aligned. | |
| 1456 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1457 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1458 | |
| 1459 // We allocate this in any case, but only do no work if the command line | |
| 1460 // param is off. | |
| 1461 _cg1r = new ConcurrentG1Refine(); | |
| 1462 | |
| 1463 // Reserve the maximum. | |
| 1464 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
| 1465 // Includes the perm-gen. | |
|
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1466 |
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1467 const size_t total_reserved = max_byte_size + pgs->max_size(); |
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1468 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1469 |
| 342 | 1470 ReservedSpace heap_rs(max_byte_size + pgs->max_size(), |
| 1471 HeapRegion::GrainBytes, | |
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1472 false /*ism*/, addr); |
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1473 |
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1474 if (UseCompressedOops) { |
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1475 if (addr != NULL && !heap_rs.is_reserved()) { |
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1476 // Failed to reserve at specified address - the requested memory |
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1477 // region is taken already, for example, by 'java' launcher. |
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1478 // Try again to reserver heap higher. |
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1479 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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1480 ReservedSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1481 false /*ism*/, addr); |
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1482 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1483 // Failed to reserve at specified address again - give up. |
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1484 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1485 assert(addr == NULL, ""); |
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1486 ReservedSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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1487 false /*ism*/, addr); |
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1488 heap_rs = heap_rs1; |
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1489 } else { |
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1490 heap_rs = heap_rs0; |
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1491 } |
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1492 } |
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1493 } |
| 342 | 1494 |
| 1495 if (!heap_rs.is_reserved()) { | |
| 1496 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
| 1497 return JNI_ENOMEM; | |
| 1498 } | |
| 1499 | |
| 1500 // It is important to do this in a way such that concurrent readers can't | |
| 1501 // temporarily think somethings in the heap. (I've actually seen this | |
| 1502 // happen in asserts: DLD.) | |
| 1503 _reserved.set_word_size(0); | |
| 1504 _reserved.set_start((HeapWord*)heap_rs.base()); | |
| 1505 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 1506 | |
| 1507 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
| 1508 | |
| 1509 _num_humongous_regions = 0; | |
| 1510 | |
| 1511 // Create the gen rem set (and barrier set) for the entire reserved region. | |
| 1512 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
| 1513 set_barrier_set(rem_set()->bs()); | |
| 1514 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
| 1515 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
| 1516 } else { | |
| 1517 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
| 1518 return JNI_ENOMEM; | |
| 1519 } | |
| 1520 | |
| 1521 // Also create a G1 rem set. | |
| 1522 if (G1UseHRIntoRS) { | |
| 1523 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { | |
| 1524 _g1_rem_set = new HRInto_G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
| 1525 } else { | |
| 1526 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); | |
| 1527 return JNI_ENOMEM; | |
| 1528 } | |
| 1529 } else { | |
| 1530 _g1_rem_set = new StupidG1RemSet(this); | |
| 1531 } | |
| 1532 | |
| 1533 // Carve out the G1 part of the heap. | |
| 1534 | |
| 1535 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
| 1536 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
| 1537 g1_rs.size()/HeapWordSize); | |
| 1538 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
| 1539 | |
| 1540 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
| 1541 | |
| 1542 _g1_storage.initialize(g1_rs, 0); | |
| 1543 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
| 1544 _g1_max_committed = _g1_committed; | |
| 393 | 1545 _hrs = new HeapRegionSeq(_expansion_regions); |
| 342 | 1546 guarantee(_hrs != NULL, "Couldn't allocate HeapRegionSeq"); |
| 1547 guarantee(_cur_alloc_region == NULL, "from constructor"); | |
| 1548 | |
|
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1549 // 6843694 - ensure that the maximum region index can fit |
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1550 // in the remembered set structures. |
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1551 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
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1552 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
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1553 |
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1554 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
|
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1555 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
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1556 guarantee((size_t) HeapRegion::CardsPerRegion < max_cards_per_region, |
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1557 "too many cards per region"); |
|
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1558 |
| 342 | 1559 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
| 1560 heap_word_size(init_byte_size)); | |
| 1561 | |
| 1562 _g1h = this; | |
| 1563 | |
| 1564 // Create the ConcurrentMark data structure and thread. | |
| 1565 // (Must do this late, so that "max_regions" is defined.) | |
| 1566 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
| 1567 _cmThread = _cm->cmThread(); | |
| 1568 | |
| 1569 // ...and the concurrent zero-fill thread, if necessary. | |
| 1570 if (G1ConcZeroFill) { | |
| 1571 _czft = new ConcurrentZFThread(); | |
| 1572 } | |
| 1573 | |
| 1574 // Initialize the from_card cache structure of HeapRegionRemSet. | |
| 1575 HeapRegionRemSet::init_heap(max_regions()); | |
| 1576 | |
| 677 | 1577 // Now expand into the initial heap size. |
| 1578 expand(init_byte_size); | |
| 342 | 1579 |
| 1580 // Perform any initialization actions delegated to the policy. | |
| 1581 g1_policy()->init(); | |
| 1582 | |
| 1583 g1_policy()->note_start_of_mark_thread(); | |
| 1584 | |
| 1585 _refine_cte_cl = | |
| 1586 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
| 1587 g1_rem_set(), | |
| 1588 concurrent_g1_refine()); | |
| 1589 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 1590 | |
| 1591 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
| 1592 SATB_Q_FL_lock, | |
| 1593 0, | |
| 1594 Shared_SATB_Q_lock); | |
| 794 | 1595 |
| 1596 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
| 1597 DirtyCardQ_FL_lock, | |
|
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1598 G1UpdateBufferQueueMaxLength, |
| 794 | 1599 Shared_DirtyCardQ_lock); |
| 1600 | |
|
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1601 if (G1DeferredRSUpdate) { |
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1602 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
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1603 DirtyCardQ_FL_lock, |
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1604 0, |
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1605 Shared_DirtyCardQ_lock, |
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1606 &JavaThread::dirty_card_queue_set()); |
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1607 } |
| 342 | 1608 // In case we're keeping closure specialization stats, initialize those |
| 1609 // counts and that mechanism. | |
| 1610 SpecializationStats::clear(); | |
| 1611 | |
| 1612 _gc_alloc_region_list = NULL; | |
| 1613 | |
| 1614 // Do later initialization work for concurrent refinement. | |
| 1615 _cg1r->init(); | |
| 1616 | |
| 1617 return JNI_OK; | |
| 1618 } | |
| 1619 | |
| 1620 void G1CollectedHeap::ref_processing_init() { | |
| 1621 SharedHeap::ref_processing_init(); | |
| 1622 MemRegion mr = reserved_region(); | |
| 1623 _ref_processor = ReferenceProcessor::create_ref_processor( | |
| 1624 mr, // span | |
| 1625 false, // Reference discovery is not atomic | |
| 1626 // (though it shouldn't matter here.) | |
| 1627 true, // mt_discovery | |
| 1628 NULL, // is alive closure: need to fill this in for efficiency | |
| 1629 ParallelGCThreads, | |
| 1630 ParallelRefProcEnabled, | |
| 1631 true); // Setting next fields of discovered | |
| 1632 // lists requires a barrier. | |
| 1633 } | |
| 1634 | |
| 1635 size_t G1CollectedHeap::capacity() const { | |
| 1636 return _g1_committed.byte_size(); | |
| 1637 } | |
| 1638 | |
| 1639 void G1CollectedHeap::iterate_dirty_card_closure(bool concurrent, | |
| 1640 int worker_i) { | |
| 889 | 1641 // Clean cards in the hot card cache |
| 1642 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set()); | |
| 1643 | |
| 342 | 1644 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
| 1645 int n_completed_buffers = 0; | |
| 1646 while (dcqs.apply_closure_to_completed_buffer(worker_i, 0, true)) { | |
| 1647 n_completed_buffers++; | |
| 1648 } | |
| 1649 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
| 1650 (double) n_completed_buffers); | |
| 1651 dcqs.clear_n_completed_buffers(); | |
| 1652 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
| 1653 } | |
| 1654 | |
| 1655 | |
| 1656 // Computes the sum of the storage used by the various regions. | |
| 1657 | |
| 1658 size_t G1CollectedHeap::used() const { | |
|
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1659 assert(Heap_lock->owner() != NULL, |
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1660 "Should be owned on this thread's behalf."); |
| 342 | 1661 size_t result = _summary_bytes_used; |
|
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1662 // Read only once in case it is set to NULL concurrently |
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1663 HeapRegion* hr = _cur_alloc_region; |
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1664 if (hr != NULL) |
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1665 result += hr->used(); |
| 342 | 1666 return result; |
| 1667 } | |
| 1668 | |
|
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1669 size_t G1CollectedHeap::used_unlocked() const { |
|
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1670 size_t result = _summary_bytes_used; |
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1671 return result; |
|
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1672 } |
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1673 |
| 342 | 1674 class SumUsedClosure: public HeapRegionClosure { |
| 1675 size_t _used; | |
| 1676 public: | |
| 1677 SumUsedClosure() : _used(0) {} | |
| 1678 bool doHeapRegion(HeapRegion* r) { | |
| 1679 if (!r->continuesHumongous()) { | |
| 1680 _used += r->used(); | |
| 1681 } | |
| 1682 return false; | |
| 1683 } | |
| 1684 size_t result() { return _used; } | |
| 1685 }; | |
| 1686 | |
| 1687 size_t G1CollectedHeap::recalculate_used() const { | |
| 1688 SumUsedClosure blk; | |
| 1689 _hrs->iterate(&blk); | |
| 1690 return blk.result(); | |
| 1691 } | |
| 1692 | |
| 1693 #ifndef PRODUCT | |
| 1694 class SumUsedRegionsClosure: public HeapRegionClosure { | |
| 1695 size_t _num; | |
| 1696 public: | |
| 677 | 1697 SumUsedRegionsClosure() : _num(0) {} |
| 342 | 1698 bool doHeapRegion(HeapRegion* r) { |
| 1699 if (r->continuesHumongous() || r->used() > 0 || r->is_gc_alloc_region()) { | |
| 1700 _num += 1; | |
| 1701 } | |
| 1702 return false; | |
| 1703 } | |
| 1704 size_t result() { return _num; } | |
| 1705 }; | |
| 1706 | |
| 1707 size_t G1CollectedHeap::recalculate_used_regions() const { | |
| 1708 SumUsedRegionsClosure blk; | |
| 1709 _hrs->iterate(&blk); | |
| 1710 return blk.result(); | |
| 1711 } | |
| 1712 #endif // PRODUCT | |
| 1713 | |
| 1714 size_t G1CollectedHeap::unsafe_max_alloc() { | |
| 1715 if (_free_regions > 0) return HeapRegion::GrainBytes; | |
| 1716 // otherwise, is there space in the current allocation region? | |
| 1717 | |
| 1718 // We need to store the current allocation region in a local variable | |
| 1719 // here. The problem is that this method doesn't take any locks and | |
| 1720 // there may be other threads which overwrite the current allocation | |
| 1721 // region field. attempt_allocation(), for example, sets it to NULL | |
| 1722 // and this can happen *after* the NULL check here but before the call | |
| 1723 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
| 1724 // to be a problem in the optimized build, since the two loads of the | |
| 1725 // current allocation region field are optimized away. | |
| 1726 HeapRegion* car = _cur_alloc_region; | |
| 1727 | |
| 1728 // FIXME: should iterate over all regions? | |
| 1729 if (car == NULL) { | |
| 1730 return 0; | |
| 1731 } | |
| 1732 return car->free(); | |
| 1733 } | |
| 1734 | |
| 1735 void G1CollectedHeap::collect(GCCause::Cause cause) { | |
| 1736 // The caller doesn't have the Heap_lock | |
| 1737 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
| 1738 MutexLocker ml(Heap_lock); | |
| 1739 collect_locked(cause); | |
| 1740 } | |
| 1741 | |
| 1742 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { | |
| 1743 assert(Thread::current()->is_VM_thread(), "Precondition#1"); | |
| 1744 assert(Heap_lock->is_locked(), "Precondition#2"); | |
| 1745 GCCauseSetter gcs(this, cause); | |
| 1746 switch (cause) { | |
| 1747 case GCCause::_heap_inspection: | |
| 1748 case GCCause::_heap_dump: { | |
| 1749 HandleMark hm; | |
| 1750 do_full_collection(false); // don't clear all soft refs | |
| 1751 break; | |
| 1752 } | |
| 1753 default: // XXX FIX ME | |
| 1754 ShouldNotReachHere(); // Unexpected use of this function | |
| 1755 } | |
| 1756 } | |
| 1757 | |
| 1758 | |
| 1759 void G1CollectedHeap::collect_locked(GCCause::Cause cause) { | |
| 1760 // Don't want to do a GC until cleanup is completed. | |
| 1761 wait_for_cleanup_complete(); | |
| 1762 | |
| 1763 // Read the GC count while holding the Heap_lock | |
| 1764 int gc_count_before = SharedHeap::heap()->total_collections(); | |
| 1765 { | |
| 1766 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
| 1767 VM_G1CollectFull op(gc_count_before, cause); | |
| 1768 VMThread::execute(&op); | |
| 1769 } | |
| 1770 } | |
| 1771 | |
| 1772 bool G1CollectedHeap::is_in(const void* p) const { | |
| 1773 if (_g1_committed.contains(p)) { | |
| 1774 HeapRegion* hr = _hrs->addr_to_region(p); | |
| 1775 return hr->is_in(p); | |
| 1776 } else { | |
| 1777 return _perm_gen->as_gen()->is_in(p); | |
| 1778 } | |
| 1779 } | |
| 1780 | |
| 1781 // Iteration functions. | |
| 1782 | |
| 1783 // Iterates an OopClosure over all ref-containing fields of objects | |
| 1784 // within a HeapRegion. | |
| 1785 | |
| 1786 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
| 1787 MemRegion _mr; | |
| 1788 OopClosure* _cl; | |
| 1789 public: | |
| 1790 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
| 1791 : _mr(mr), _cl(cl) {} | |
| 1792 bool doHeapRegion(HeapRegion* r) { | |
| 1793 if (! r->continuesHumongous()) { | |
| 1794 r->oop_iterate(_cl); | |
| 1795 } | |
| 1796 return false; | |
| 1797 } | |
| 1798 }; | |
| 1799 | |
| 678 | 1800 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
| 342 | 1801 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
| 1802 _hrs->iterate(&blk); | |
| 678 | 1803 if (do_perm) { |
| 1804 perm_gen()->oop_iterate(cl); | |
| 1805 } | |
| 342 | 1806 } |
| 1807 | |
| 678 | 1808 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
| 342 | 1809 IterateOopClosureRegionClosure blk(mr, cl); |
| 1810 _hrs->iterate(&blk); | |
| 678 | 1811 if (do_perm) { |
| 1812 perm_gen()->oop_iterate(cl); | |
| 1813 } | |
| 342 | 1814 } |
| 1815 | |
| 1816 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
| 1817 | |
| 1818 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
| 1819 ObjectClosure* _cl; | |
| 1820 public: | |
| 1821 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
| 1822 bool doHeapRegion(HeapRegion* r) { | |
| 1823 if (! r->continuesHumongous()) { | |
| 1824 r->object_iterate(_cl); | |
| 1825 } | |
| 1826 return false; | |
| 1827 } | |
| 1828 }; | |
| 1829 | |
| 678 | 1830 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
| 342 | 1831 IterateObjectClosureRegionClosure blk(cl); |
| 1832 _hrs->iterate(&blk); | |
| 678 | 1833 if (do_perm) { |
| 1834 perm_gen()->object_iterate(cl); | |
| 1835 } | |
| 342 | 1836 } |
| 1837 | |
| 1838 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
| 1839 // FIXME: is this right? | |
| 1840 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
| 1841 } | |
| 1842 | |
| 1843 // Calls a SpaceClosure on a HeapRegion. | |
| 1844 | |
| 1845 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
| 1846 SpaceClosure* _cl; | |
| 1847 public: | |
| 1848 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
| 1849 bool doHeapRegion(HeapRegion* r) { | |
| 1850 _cl->do_space(r); | |
| 1851 return false; | |
| 1852 } | |
| 1853 }; | |
| 1854 | |
| 1855 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
| 1856 SpaceClosureRegionClosure blk(cl); | |
| 1857 _hrs->iterate(&blk); | |
| 1858 } | |
| 1859 | |
| 1860 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) { | |
| 1861 _hrs->iterate(cl); | |
| 1862 } | |
| 1863 | |
| 1864 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
| 1865 HeapRegionClosure* cl) { | |
| 1866 _hrs->iterate_from(r, cl); | |
| 1867 } | |
| 1868 | |
| 1869 void | |
| 1870 G1CollectedHeap::heap_region_iterate_from(int idx, HeapRegionClosure* cl) { | |
| 1871 _hrs->iterate_from(idx, cl); | |
| 1872 } | |
| 1873 | |
| 1874 HeapRegion* G1CollectedHeap::region_at(size_t idx) { return _hrs->at(idx); } | |
| 1875 | |
| 1876 void | |
| 1877 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
| 1878 int worker, | |
| 1879 jint claim_value) { | |
| 355 | 1880 const size_t regions = n_regions(); |
| 1881 const size_t worker_num = (ParallelGCThreads > 0 ? ParallelGCThreads : 1); | |
| 1882 // try to spread out the starting points of the workers | |
| 1883 const size_t start_index = regions / worker_num * (size_t) worker; | |
| 1884 | |
| 1885 // each worker will actually look at all regions | |
| 1886 for (size_t count = 0; count < regions; ++count) { | |
| 1887 const size_t index = (start_index + count) % regions; | |
| 1888 assert(0 <= index && index < regions, "sanity"); | |
| 1889 HeapRegion* r = region_at(index); | |
| 1890 // we'll ignore "continues humongous" regions (we'll process them | |
| 1891 // when we come across their corresponding "start humongous" | |
| 1892 // region) and regions already claimed | |
| 1893 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
| 1894 continue; | |
| 1895 } | |
| 1896 // OK, try to claim it | |
| 342 | 1897 if (r->claimHeapRegion(claim_value)) { |
| 355 | 1898 // success! |
| 1899 assert(!r->continuesHumongous(), "sanity"); | |
| 1900 if (r->startsHumongous()) { | |
| 1901 // If the region is "starts humongous" we'll iterate over its | |
| 1902 // "continues humongous" first; in fact we'll do them | |
| 1903 // first. The order is important. In on case, calling the | |
| 1904 // closure on the "starts humongous" region might de-allocate | |
| 1905 // and clear all its "continues humongous" regions and, as a | |
| 1906 // result, we might end up processing them twice. So, we'll do | |
| 1907 // them first (notice: most closures will ignore them anyway) and | |
| 1908 // then we'll do the "starts humongous" region. | |
| 1909 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
| 1910 HeapRegion* chr = region_at(ch_index); | |
| 1911 | |
| 1912 // if the region has already been claimed or it's not | |
| 1913 // "continues humongous" we're done | |
| 1914 if (chr->claim_value() == claim_value || | |
| 1915 !chr->continuesHumongous()) { | |
| 1916 break; | |
| 1917 } | |
| 1918 | |
| 1919 // Noone should have claimed it directly. We can given | |
| 1920 // that we claimed its "starts humongous" region. | |
| 1921 assert(chr->claim_value() != claim_value, "sanity"); | |
| 1922 assert(chr->humongous_start_region() == r, "sanity"); | |
| 1923 | |
| 1924 if (chr->claimHeapRegion(claim_value)) { | |
| 1925 // we should always be able to claim it; noone else should | |
| 1926 // be trying to claim this region | |
| 1927 | |
| 1928 bool res2 = cl->doHeapRegion(chr); | |
| 1929 assert(!res2, "Should not abort"); | |
| 1930 | |
| 1931 // Right now, this holds (i.e., no closure that actually | |
| 1932 // does something with "continues humongous" regions | |
| 1933 // clears them). We might have to weaken it in the future, | |
| 1934 // but let's leave these two asserts here for extra safety. | |
| 1935 assert(chr->continuesHumongous(), "should still be the case"); | |
| 1936 assert(chr->humongous_start_region() == r, "sanity"); | |
| 1937 } else { | |
| 1938 guarantee(false, "we should not reach here"); | |
| 1939 } | |
| 1940 } | |
| 1941 } | |
| 1942 | |
| 1943 assert(!r->continuesHumongous(), "sanity"); | |
| 1944 bool res = cl->doHeapRegion(r); | |
| 1945 assert(!res, "Should not abort"); | |
| 1946 } | |
| 1947 } | |
| 1948 } | |
| 1949 | |
| 390 | 1950 class ResetClaimValuesClosure: public HeapRegionClosure { |
| 1951 public: | |
| 1952 bool doHeapRegion(HeapRegion* r) { | |
| 1953 r->set_claim_value(HeapRegion::InitialClaimValue); | |
| 1954 return false; | |
| 1955 } | |
| 1956 }; | |
| 1957 | |
| 1958 void | |
| 1959 G1CollectedHeap::reset_heap_region_claim_values() { | |
| 1960 ResetClaimValuesClosure blk; | |
| 1961 heap_region_iterate(&blk); | |
| 1962 } | |
| 1963 | |
| 355 | 1964 #ifdef ASSERT |
| 1965 // This checks whether all regions in the heap have the correct claim | |
| 1966 // value. I also piggy-backed on this a check to ensure that the | |
| 1967 // humongous_start_region() information on "continues humongous" | |
| 1968 // regions is correct. | |
| 1969 | |
| 1970 class CheckClaimValuesClosure : public HeapRegionClosure { | |
| 1971 private: | |
| 1972 jint _claim_value; | |
| 1973 size_t _failures; | |
| 1974 HeapRegion* _sh_region; | |
| 1975 public: | |
| 1976 CheckClaimValuesClosure(jint claim_value) : | |
| 1977 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
| 1978 bool doHeapRegion(HeapRegion* r) { | |
| 1979 if (r->claim_value() != _claim_value) { | |
| 1980 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
| 1981 "claim value = %d, should be %d", | |
| 1982 r->bottom(), r->end(), r->claim_value(), | |
| 1983 _claim_value); | |
| 1984 ++_failures; | |
| 1985 } | |
| 1986 if (!r->isHumongous()) { | |
| 1987 _sh_region = NULL; | |
| 1988 } else if (r->startsHumongous()) { | |
| 1989 _sh_region = r; | |
| 1990 } else if (r->continuesHumongous()) { | |
| 1991 if (r->humongous_start_region() != _sh_region) { | |
| 1992 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
| 1993 "HS = "PTR_FORMAT", should be "PTR_FORMAT, | |
| 1994 r->bottom(), r->end(), | |
| 1995 r->humongous_start_region(), | |
| 1996 _sh_region); | |
| 1997 ++_failures; | |
| 342 | 1998 } |
| 1999 } | |
| 355 | 2000 return false; |
| 2001 } | |
| 2002 size_t failures() { | |
| 2003 return _failures; | |
| 2004 } | |
| 2005 }; | |
| 2006 | |
| 2007 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
| 2008 CheckClaimValuesClosure cl(claim_value); | |
| 2009 heap_region_iterate(&cl); | |
| 2010 return cl.failures() == 0; | |
| 2011 } | |
| 2012 #endif // ASSERT | |
| 342 | 2013 |
| 2014 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { | |
| 2015 HeapRegion* r = g1_policy()->collection_set(); | |
| 2016 while (r != NULL) { | |
| 2017 HeapRegion* next = r->next_in_collection_set(); | |
| 2018 if (cl->doHeapRegion(r)) { | |
| 2019 cl->incomplete(); | |
| 2020 return; | |
| 2021 } | |
| 2022 r = next; | |
| 2023 } | |
| 2024 } | |
| 2025 | |
| 2026 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
| 2027 HeapRegionClosure *cl) { | |
| 2028 assert(r->in_collection_set(), | |
| 2029 "Start region must be a member of the collection set."); | |
| 2030 HeapRegion* cur = r; | |
| 2031 while (cur != NULL) { | |
| 2032 HeapRegion* next = cur->next_in_collection_set(); | |
| 2033 if (cl->doHeapRegion(cur) && false) { | |
| 2034 cl->incomplete(); | |
| 2035 return; | |
| 2036 } | |
| 2037 cur = next; | |
| 2038 } | |
| 2039 cur = g1_policy()->collection_set(); | |
| 2040 while (cur != r) { | |
| 2041 HeapRegion* next = cur->next_in_collection_set(); | |
| 2042 if (cl->doHeapRegion(cur) && false) { | |
| 2043 cl->incomplete(); | |
| 2044 return; | |
| 2045 } | |
| 2046 cur = next; | |
| 2047 } | |
| 2048 } | |
| 2049 | |
| 2050 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
| 2051 return _hrs->length() > 0 ? _hrs->at(0) : NULL; | |
| 2052 } | |
| 2053 | |
| 2054 | |
| 2055 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
| 2056 Space* res = heap_region_containing(addr); | |
| 2057 if (res == NULL) | |
| 2058 res = perm_gen()->space_containing(addr); | |
| 2059 return res; | |
| 2060 } | |
| 2061 | |
| 2062 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
| 2063 Space* sp = space_containing(addr); | |
| 2064 if (sp != NULL) { | |
| 2065 return sp->block_start(addr); | |
| 2066 } | |
| 2067 return NULL; | |
| 2068 } | |
| 2069 | |
| 2070 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
| 2071 Space* sp = space_containing(addr); | |
| 2072 assert(sp != NULL, "block_size of address outside of heap"); | |
| 2073 return sp->block_size(addr); | |
| 2074 } | |
| 2075 | |
| 2076 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
| 2077 Space* sp = space_containing(addr); | |
| 2078 return sp->block_is_obj(addr); | |
| 2079 } | |
| 2080 | |
| 2081 bool G1CollectedHeap::supports_tlab_allocation() const { | |
| 2082 return true; | |
| 2083 } | |
| 2084 | |
| 2085 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
| 2086 return HeapRegion::GrainBytes; | |
| 2087 } | |
| 2088 | |
| 2089 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
| 2090 // Return the remaining space in the cur alloc region, but not less than | |
| 2091 // the min TLAB size. | |
| 2092 // Also, no more than half the region size, since we can't allow tlabs to | |
| 2093 // grow big enough to accomodate humongous objects. | |
| 2094 | |
| 2095 // We need to story it locally, since it might change between when we | |
| 2096 // test for NULL and when we use it later. | |
| 2097 ContiguousSpace* cur_alloc_space = _cur_alloc_region; | |
| 2098 if (cur_alloc_space == NULL) { | |
| 2099 return HeapRegion::GrainBytes/2; | |
| 2100 } else { | |
| 2101 return MAX2(MIN2(cur_alloc_space->free(), | |
| 2102 (size_t)(HeapRegion::GrainBytes/2)), | |
| 2103 (size_t)MinTLABSize); | |
| 2104 } | |
| 2105 } | |
| 2106 | |
| 2107 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t size) { | |
| 2108 bool dummy; | |
| 2109 return G1CollectedHeap::mem_allocate(size, false, true, &dummy); | |
| 2110 } | |
| 2111 | |
| 2112 bool G1CollectedHeap::allocs_are_zero_filled() { | |
| 2113 return false; | |
| 2114 } | |
| 2115 | |
| 2116 size_t G1CollectedHeap::large_typearray_limit() { | |
| 2117 // FIXME | |
| 2118 return HeapRegion::GrainBytes/HeapWordSize; | |
| 2119 } | |
| 2120 | |
| 2121 size_t G1CollectedHeap::max_capacity() const { | |
| 2122 return _g1_committed.byte_size(); | |
| 2123 } | |
| 2124 | |
| 2125 jlong G1CollectedHeap::millis_since_last_gc() { | |
| 2126 // assert(false, "NYI"); | |
| 2127 return 0; | |
| 2128 } | |
| 2129 | |
| 2130 | |
| 2131 void G1CollectedHeap::prepare_for_verify() { | |
| 2132 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
| 2133 ensure_parsability(false); | |
| 2134 } | |
| 2135 g1_rem_set()->prepare_for_verify(); | |
| 2136 } | |
| 2137 | |
| 2138 class VerifyLivenessOopClosure: public OopClosure { | |
| 2139 G1CollectedHeap* g1h; | |
| 2140 public: | |
| 2141 VerifyLivenessOopClosure(G1CollectedHeap* _g1h) { | |
| 2142 g1h = _g1h; | |
| 2143 } | |
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2144 void do_oop(narrowOop *p) { do_oop_work(p); } |
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2145 void do_oop( oop *p) { do_oop_work(p); } |
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2146 |
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2147 template <class T> void do_oop_work(T *p) { |
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2148 oop obj = oopDesc::load_decode_heap_oop(p); |
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2149 guarantee(obj == NULL || !g1h->is_obj_dead(obj), |
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2150 "Dead object referenced by a not dead object"); |
| 342 | 2151 } |
| 2152 }; | |
| 2153 | |
| 2154 class VerifyObjsInRegionClosure: public ObjectClosure { | |
| 811 | 2155 private: |
| 342 | 2156 G1CollectedHeap* _g1h; |
| 2157 size_t _live_bytes; | |
| 2158 HeapRegion *_hr; | |
| 811 | 2159 bool _use_prev_marking; |
| 342 | 2160 public: |
| 811 | 2161 // use_prev_marking == true -> use "prev" marking information, |
| 2162 // use_prev_marking == false -> use "next" marking information | |
| 2163 VerifyObjsInRegionClosure(HeapRegion *hr, bool use_prev_marking) | |
| 2164 : _live_bytes(0), _hr(hr), _use_prev_marking(use_prev_marking) { | |
| 342 | 2165 _g1h = G1CollectedHeap::heap(); |
| 2166 } | |
| 2167 void do_object(oop o) { | |
| 2168 VerifyLivenessOopClosure isLive(_g1h); | |
| 2169 assert(o != NULL, "Huh?"); | |
| 811 | 2170 if (!_g1h->is_obj_dead_cond(o, _use_prev_marking)) { |
| 342 | 2171 o->oop_iterate(&isLive); |
| 2172 if (!_hr->obj_allocated_since_prev_marking(o)) | |
| 2173 _live_bytes += (o->size() * HeapWordSize); | |
| 2174 } | |
| 2175 } | |
| 2176 size_t live_bytes() { return _live_bytes; } | |
| 2177 }; | |
| 2178 | |
| 2179 class PrintObjsInRegionClosure : public ObjectClosure { | |
| 2180 HeapRegion *_hr; | |
| 2181 G1CollectedHeap *_g1; | |
| 2182 public: | |
| 2183 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
| 2184 _g1 = G1CollectedHeap::heap(); | |
| 2185 }; | |
| 2186 | |
| 2187 void do_object(oop o) { | |
| 2188 if (o != NULL) { | |
| 2189 HeapWord *start = (HeapWord *) o; | |
| 2190 size_t word_sz = o->size(); | |
| 2191 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
| 2192 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
| 2193 (void*) o, word_sz, | |
| 2194 _g1->isMarkedPrev(o), | |
| 2195 _g1->isMarkedNext(o), | |
| 2196 _hr->obj_allocated_since_prev_marking(o)); | |
| 2197 HeapWord *end = start + word_sz; | |
| 2198 HeapWord *cur; | |
| 2199 int *val; | |
| 2200 for (cur = start; cur < end; cur++) { | |
| 2201 val = (int *) cur; | |
| 2202 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
| 2203 } | |
| 2204 } | |
| 2205 } | |
| 2206 }; | |
| 2207 | |
| 2208 class VerifyRegionClosure: public HeapRegionClosure { | |
| 811 | 2209 private: |
| 342 | 2210 bool _allow_dirty; |
| 390 | 2211 bool _par; |
| 811 | 2212 bool _use_prev_marking; |
| 2213 public: | |
| 2214 // use_prev_marking == true -> use "prev" marking information, | |
| 2215 // use_prev_marking == false -> use "next" marking information | |
| 2216 VerifyRegionClosure(bool allow_dirty, bool par, bool use_prev_marking) | |
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2217 : _allow_dirty(allow_dirty), |
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2218 _par(par), |
| 811 | 2219 _use_prev_marking(use_prev_marking) {} |
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2220 |
| 342 | 2221 bool doHeapRegion(HeapRegion* r) { |
| 390 | 2222 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
| 2223 "Should be unclaimed at verify points."); | |
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2224 if (!r->continuesHumongous()) { |
| 811 | 2225 VerifyObjsInRegionClosure not_dead_yet_cl(r, _use_prev_marking); |
| 2226 r->verify(_allow_dirty, _use_prev_marking); | |
| 342 | 2227 r->object_iterate(¬_dead_yet_cl); |
| 2228 guarantee(r->max_live_bytes() >= not_dead_yet_cl.live_bytes(), | |
| 2229 "More live objects than counted in last complete marking."); | |
| 2230 } | |
| 2231 return false; | |
| 2232 } | |
| 2233 }; | |
| 2234 | |
| 2235 class VerifyRootsClosure: public OopsInGenClosure { | |
| 2236 private: | |
| 2237 G1CollectedHeap* _g1h; | |
| 2238 bool _failures; | |
| 811 | 2239 bool _use_prev_marking; |
| 342 | 2240 public: |
| 811 | 2241 // use_prev_marking == true -> use "prev" marking information, |
| 2242 // use_prev_marking == false -> use "next" marking information | |
| 2243 VerifyRootsClosure(bool use_prev_marking) : | |
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2244 _g1h(G1CollectedHeap::heap()), |
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2245 _failures(false), |
| 811 | 2246 _use_prev_marking(use_prev_marking) { } |
| 342 | 2247 |
| 2248 bool failures() { return _failures; } | |
| 2249 | |
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2250 template <class T> void do_oop_nv(T* p) { |
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2251 T heap_oop = oopDesc::load_heap_oop(p); |
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2252 if (!oopDesc::is_null(heap_oop)) { |
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2253 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
| 811 | 2254 if (_g1h->is_obj_dead_cond(obj, _use_prev_marking)) { |
| 342 | 2255 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
| 2256 "points to dead obj "PTR_FORMAT, p, (void*) obj); | |
| 2257 obj->print_on(gclog_or_tty); | |
| 2258 _failures = true; | |
| 2259 } | |
| 2260 } | |
| 2261 } | |
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2262 |
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2263 void do_oop(oop* p) { do_oop_nv(p); } |
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2264 void do_oop(narrowOop* p) { do_oop_nv(p); } |
| 342 | 2265 }; |
| 2266 | |
| 390 | 2267 // This is the task used for parallel heap verification. |
| 2268 | |
| 2269 class G1ParVerifyTask: public AbstractGangTask { | |
| 2270 private: | |
| 2271 G1CollectedHeap* _g1h; | |
| 2272 bool _allow_dirty; | |
| 811 | 2273 bool _use_prev_marking; |
| 390 | 2274 |
| 2275 public: | |
| 811 | 2276 // use_prev_marking == true -> use "prev" marking information, |
| 2277 // use_prev_marking == false -> use "next" marking information | |
| 2278 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, | |
| 2279 bool use_prev_marking) : | |
| 390 | 2280 AbstractGangTask("Parallel verify task"), |
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2281 _g1h(g1h), |
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2282 _allow_dirty(allow_dirty), |
| 811 | 2283 _use_prev_marking(use_prev_marking) { } |
| 390 | 2284 |
| 2285 void work(int worker_i) { | |
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2286 HandleMark hm; |
| 811 | 2287 VerifyRegionClosure blk(_allow_dirty, true, _use_prev_marking); |
| 390 | 2288 _g1h->heap_region_par_iterate_chunked(&blk, worker_i, |
| 2289 HeapRegion::ParVerifyClaimValue); | |
| 2290 } | |
| 2291 }; | |
| 2292 | |
| 342 | 2293 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
| 811 | 2294 verify(allow_dirty, silent, /* use_prev_marking */ true); |
| 2295 } | |
| 2296 | |
| 2297 void G1CollectedHeap::verify(bool allow_dirty, | |
| 2298 bool silent, | |
| 2299 bool use_prev_marking) { | |
| 342 | 2300 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
| 2301 if (!silent) { gclog_or_tty->print("roots "); } | |
| 811 | 2302 VerifyRootsClosure rootsCl(use_prev_marking); |
| 342 | 2303 process_strong_roots(false, |
| 2304 SharedHeap::SO_AllClasses, | |
| 2305 &rootsCl, | |
| 2306 &rootsCl); | |
| 2307 rem_set()->invalidate(perm_gen()->used_region(), false); | |
| 2308 if (!silent) { gclog_or_tty->print("heapRegions "); } | |
| 390 | 2309 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
| 2310 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2311 "sanity check"); | |
| 2312 | |
| 811 | 2313 G1ParVerifyTask task(this, allow_dirty, use_prev_marking); |
| 390 | 2314 int n_workers = workers()->total_workers(); |
| 2315 set_par_threads(n_workers); | |
| 2316 workers()->run_task(&task); | |
| 2317 set_par_threads(0); | |
| 2318 | |
| 2319 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), | |
| 2320 "sanity check"); | |
| 2321 | |
| 2322 reset_heap_region_claim_values(); | |
| 2323 | |
| 2324 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2325 "sanity check"); | |
| 2326 } else { | |
| 811 | 2327 VerifyRegionClosure blk(allow_dirty, false, use_prev_marking); |
| 390 | 2328 _hrs->iterate(&blk); |
| 2329 } | |
| 342 | 2330 if (!silent) gclog_or_tty->print("remset "); |
| 2331 rem_set()->verify(); | |
| 2332 guarantee(!rootsCl.failures(), "should not have had failures"); | |
| 2333 } else { | |
| 2334 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
| 2335 } | |
| 2336 } | |
| 2337 | |
| 2338 class PrintRegionClosure: public HeapRegionClosure { | |
| 2339 outputStream* _st; | |
| 2340 public: | |
| 2341 PrintRegionClosure(outputStream* st) : _st(st) {} | |
| 2342 bool doHeapRegion(HeapRegion* r) { | |
| 2343 r->print_on(_st); | |
| 2344 return false; | |
| 2345 } | |
| 2346 }; | |
| 2347 | |
|
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2348 void G1CollectedHeap::print() const { print_on(tty); } |
| 342 | 2349 |
| 2350 void G1CollectedHeap::print_on(outputStream* st) const { | |
|
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2351 print_on(st, PrintHeapAtGCExtended); |
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2352 } |
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2353 |
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2354 void G1CollectedHeap::print_on(outputStream* st, bool extended) const { |
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2355 st->print(" %-20s", "garbage-first heap"); |
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2356 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
|
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2357 capacity()/K, used_unlocked()/K); |
|
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2358 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
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2359 _g1_storage.low_boundary(), |
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2360 _g1_storage.high(), |
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2361 _g1_storage.high_boundary()); |
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2362 st->cr(); |
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2363 st->print(" region size " SIZE_FORMAT "K, ", |
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2364 HeapRegion::GrainBytes/K); |
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2365 size_t young_regions = _young_list->length(); |
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2366 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
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2367 young_regions, young_regions * HeapRegion::GrainBytes / K); |
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2368 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
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2369 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
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2370 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
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2371 st->cr(); |
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2372 perm()->as_gen()->print_on(st); |
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2373 if (extended) { |
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2374 print_on_extended(st); |
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2375 } |
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2376 } |
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2377 |
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2378 void G1CollectedHeap::print_on_extended(outputStream* st) const { |
| 342 | 2379 PrintRegionClosure blk(st); |
| 2380 _hrs->iterate(&blk); | |
| 2381 } | |
| 2382 | |
| 794 | 2383 class PrintOnThreadsClosure : public ThreadClosure { |
| 2384 outputStream* _st; | |
| 2385 public: | |
| 2386 PrintOnThreadsClosure(outputStream* st) : _st(st) { } | |
| 2387 virtual void do_thread(Thread *t) { | |
| 2388 t->print_on(_st); | |
| 2389 } | |
| 2390 }; | |
| 2391 | |
| 342 | 2392 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { |
| 2393 if (ParallelGCThreads > 0) { | |
| 2394 workers()->print_worker_threads(); | |
| 2395 } | |
| 2396 st->print("\"G1 concurrent mark GC Thread\" "); | |
| 2397 _cmThread->print(); | |
| 2398 st->cr(); | |
| 794 | 2399 st->print("\"G1 concurrent refinement GC Threads\" "); |
| 2400 PrintOnThreadsClosure p(st); | |
| 2401 _cg1r->threads_do(&p); | |
| 342 | 2402 st->cr(); |
| 2403 st->print("\"G1 zero-fill GC Thread\" "); | |
| 2404 _czft->print_on(st); | |
| 2405 st->cr(); | |
| 2406 } | |
| 2407 | |
| 2408 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
| 2409 if (ParallelGCThreads > 0) { | |
| 2410 workers()->threads_do(tc); | |
| 2411 } | |
| 2412 tc->do_thread(_cmThread); | |
| 794 | 2413 _cg1r->threads_do(tc); |
| 342 | 2414 tc->do_thread(_czft); |
| 2415 } | |
| 2416 | |
| 2417 void G1CollectedHeap::print_tracing_info() const { | |
| 2418 // We'll overload this to mean "trace GC pause statistics." | |
| 2419 if (TraceGen0Time || TraceGen1Time) { | |
| 2420 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
| 2421 // to that. | |
| 2422 g1_policy()->print_tracing_info(); | |
| 2423 } | |
| 751 | 2424 if (G1SummarizeRSetStats) { |
| 342 | 2425 g1_rem_set()->print_summary_info(); |
| 2426 } | |
| 751 | 2427 if (G1SummarizeConcurrentMark) { |
| 342 | 2428 concurrent_mark()->print_summary_info(); |
| 2429 } | |
| 751 | 2430 if (G1SummarizeZFStats) { |
| 342 | 2431 ConcurrentZFThread::print_summary_info(); |
| 2432 } | |
| 2433 g1_policy()->print_yg_surv_rate_info(); | |
| 2434 | |
| 2435 SpecializationStats::print(); | |
| 2436 } | |
| 2437 | |
| 2438 | |
| 2439 int G1CollectedHeap::addr_to_arena_id(void* addr) const { | |
| 2440 HeapRegion* hr = heap_region_containing(addr); | |
| 2441 if (hr == NULL) { | |
| 2442 return 0; | |
| 2443 } else { | |
| 2444 return 1; | |
| 2445 } | |
| 2446 } | |
| 2447 | |
| 2448 G1CollectedHeap* G1CollectedHeap::heap() { | |
| 2449 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
| 2450 "not a garbage-first heap"); | |
| 2451 return _g1h; | |
| 2452 } | |
| 2453 | |
| 2454 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
| 2455 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); | |
| 2456 // Call allocation profiler | |
| 2457 AllocationProfiler::iterate_since_last_gc(); | |
| 2458 // Fill TLAB's and such | |
| 2459 ensure_parsability(true); | |
| 2460 } | |
| 2461 | |
| 2462 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
| 2463 // FIXME: what is this about? | |
| 2464 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
| 2465 // is set. | |
| 2466 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
| 2467 "derived pointer present")); | |
| 2468 } | |
| 2469 | |
| 2470 void G1CollectedHeap::do_collection_pause() { | |
| 2471 // Read the GC count while holding the Heap_lock | |
| 2472 // we need to do this _before_ wait_for_cleanup_complete(), to | |
| 2473 // ensure that we do not give up the heap lock and potentially | |
| 2474 // pick up the wrong count | |
| 2475 int gc_count_before = SharedHeap::heap()->total_collections(); | |
| 2476 | |
| 2477 // Don't want to do a GC pause while cleanup is being completed! | |
| 2478 wait_for_cleanup_complete(); | |
| 2479 | |
| 2480 g1_policy()->record_stop_world_start(); | |
| 2481 { | |
| 2482 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
| 2483 VM_G1IncCollectionPause op(gc_count_before); | |
| 2484 VMThread::execute(&op); | |
| 2485 } | |
| 2486 } | |
| 2487 | |
| 2488 void | |
| 2489 G1CollectedHeap::doConcurrentMark() { | |
|
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2490 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
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2491 if (!_cmThread->in_progress()) { |
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2492 _cmThread->set_started(); |
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2493 CGC_lock->notify(); |
| 342 | 2494 } |
| 2495 } | |
| 2496 | |
| 2497 class VerifyMarkedObjsClosure: public ObjectClosure { | |
| 2498 G1CollectedHeap* _g1h; | |
| 2499 public: | |
| 2500 VerifyMarkedObjsClosure(G1CollectedHeap* g1h) : _g1h(g1h) {} | |
| 2501 void do_object(oop obj) { | |
| 2502 assert(obj->mark()->is_marked() ? !_g1h->is_obj_dead(obj) : true, | |
| 2503 "markandsweep mark should agree with concurrent deadness"); | |
| 2504 } | |
| 2505 }; | |
| 2506 | |
| 2507 void | |
| 2508 G1CollectedHeap::checkConcurrentMark() { | |
| 2509 VerifyMarkedObjsClosure verifycl(this); | |
| 2510 // MutexLockerEx x(getMarkBitMapLock(), | |
| 2511 // Mutex::_no_safepoint_check_flag); | |
| 678 | 2512 object_iterate(&verifycl, false); |
| 342 | 2513 } |
| 2514 | |
| 2515 void G1CollectedHeap::do_sync_mark() { | |
| 2516 _cm->checkpointRootsInitial(); | |
| 2517 _cm->markFromRoots(); | |
| 2518 _cm->checkpointRootsFinal(false); | |
| 2519 } | |
| 2520 | |
| 2521 // <NEW PREDICTION> | |
| 2522 | |
| 2523 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
| 2524 bool young) { | |
| 2525 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
| 2526 } | |
| 2527 | |
| 2528 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
| 2529 predicted_time_ms) { | |
| 2530 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
| 2531 } | |
| 2532 | |
| 2533 size_t G1CollectedHeap::pending_card_num() { | |
| 2534 size_t extra_cards = 0; | |
| 2535 JavaThread *curr = Threads::first(); | |
| 2536 while (curr != NULL) { | |
| 2537 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
| 2538 extra_cards += dcq.size(); | |
| 2539 curr = curr->next(); | |
| 2540 } | |
| 2541 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 2542 size_t buffer_size = dcqs.buffer_size(); | |
| 2543 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 2544 return buffer_size * buffer_num + extra_cards; | |
| 2545 } | |
| 2546 | |
| 2547 size_t G1CollectedHeap::max_pending_card_num() { | |
| 2548 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 2549 size_t buffer_size = dcqs.buffer_size(); | |
| 2550 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 2551 int thread_num = Threads::number_of_threads(); | |
| 2552 return (buffer_num + thread_num) * buffer_size; | |
| 2553 } | |
| 2554 | |
| 2555 size_t G1CollectedHeap::cards_scanned() { | |
| 2556 HRInto_G1RemSet* g1_rset = (HRInto_G1RemSet*) g1_rem_set(); | |
| 2557 return g1_rset->cardsScanned(); | |
| 2558 } | |
| 2559 | |
| 2560 void | |
| 2561 G1CollectedHeap::setup_surviving_young_words() { | |
| 2562 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
| 2563 size_t array_length = g1_policy()->young_cset_length(); | |
| 2564 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); | |
| 2565 if (_surviving_young_words == NULL) { | |
| 2566 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
| 2567 "Not enough space for young surv words summary."); | |
| 2568 } | |
| 2569 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
|
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2570 #ifdef ASSERT |
| 342 | 2571 for (size_t i = 0; i < array_length; ++i) { |
|
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2572 assert( _surviving_young_words[i] == 0, "memset above" ); |
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2573 } |
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2574 #endif // !ASSERT |
| 342 | 2575 } |
| 2576 | |
| 2577 void | |
| 2578 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
| 2579 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 2580 size_t array_length = g1_policy()->young_cset_length(); | |
| 2581 for (size_t i = 0; i < array_length; ++i) | |
| 2582 _surviving_young_words[i] += surv_young_words[i]; | |
| 2583 } | |
| 2584 | |
| 2585 void | |
| 2586 G1CollectedHeap::cleanup_surviving_young_words() { | |
| 2587 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
| 2588 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
| 2589 _surviving_young_words = NULL; | |
| 2590 } | |
| 2591 | |
| 2592 // </NEW PREDICTION> | |
| 2593 | |
| 2594 void | |
| 677 | 2595 G1CollectedHeap::do_collection_pause_at_safepoint() { |
|
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2596 if (PrintHeapAtGC) { |
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2597 Universe::print_heap_before_gc(); |
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2598 } |
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2599 |
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2600 { |
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2601 char verbose_str[128]; |
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2602 sprintf(verbose_str, "GC pause "); |
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2603 if (g1_policy()->in_young_gc_mode()) { |
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2604 if (g1_policy()->full_young_gcs()) |
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2605 strcat(verbose_str, "(young)"); |
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2606 else |
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2607 strcat(verbose_str, "(partial)"); |
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2608 } |
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2609 if (g1_policy()->should_initiate_conc_mark()) |
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2610 strcat(verbose_str, " (initial-mark)"); |
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2611 |
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2612 GCCauseSetter x(this, GCCause::_g1_inc_collection_pause); |
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2613 |
|
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2614 // if PrintGCDetails is on, we'll print long statistics information |
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2615 // in the collector policy code, so let's not print this as the output |
|
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2616 // is messy if we do. |
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2617 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
|
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2618 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
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2619 TraceTime t(verbose_str, PrintGC && !PrintGCDetails, true, gclog_or_tty); |
|
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2620 |
|
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|
2621 ResourceMark rm; |
|
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2622 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
|
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2623 assert(Thread::current() == VMThread::vm_thread(), "should be in vm thread"); |
|
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2624 guarantee(!is_gc_active(), "collection is not reentrant"); |
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2625 assert(regions_accounted_for(), "Region leakage!"); |
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2626 |
|
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|
2627 increment_gc_time_stamp(); |
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2628 |
|
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|
2629 if (g1_policy()->in_young_gc_mode()) { |
|
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2630 assert(check_young_list_well_formed(), |
|
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2631 "young list should be well formed"); |
|
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2632 } |
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2633 |
|
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|
2634 if (GC_locker::is_active()) { |
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2635 return; // GC is disabled (e.g. JNI GetXXXCritical operation) |
|
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2636 } |
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2637 |
|
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|
2638 bool abandoned = false; |
|
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2639 { // Call to jvmpi::post_class_unload_events must occur outside of active GC |
|
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2640 IsGCActiveMark x; |
|
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2641 |
|
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|
2642 gc_prologue(false); |
|
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|
2643 increment_total_collections(false /* full gc */); |
| 342 | 2644 |
| 2645 #if G1_REM_SET_LOGGING | |
|
838
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2646 gclog_or_tty->print_cr("\nJust chose CS, heap:"); |
|
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|
2647 print(); |
| 342 | 2648 #endif |
| 2649 | |
|
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2650 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
|
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|
2651 HandleMark hm; // Discard invalid handles created during verification |
|
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|
2652 prepare_for_verify(); |
|
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|
2653 gclog_or_tty->print(" VerifyBeforeGC:"); |
|
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|
2654 Universe::verify(false); |
|
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|
2655 } |
|
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|
2656 |
|
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|
2657 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
|
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|
2658 |
|
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|
2659 // We want to turn off ref discovery, if necessary, and turn it back on |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
2660 // on again later if we do. XXX Dubious: why is discovery disabled? |
|
838
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|
2661 bool was_enabled = ref_processor()->discovery_enabled(); |
|
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|
2662 if (was_enabled) ref_processor()->disable_discovery(); |
|
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|
2663 |
|
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|
2664 // Forget the current alloc region (we might even choose it to be part |
|
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|
2665 // of the collection set!). |
|
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|
2666 abandon_cur_alloc_region(); |
|
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|
2667 |
|
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|
2668 // The elapsed time induced by the start time below deliberately elides |
|
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|
2669 // the possible verification above. |
|
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|
2670 double start_time_sec = os::elapsedTime(); |
|
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|
2671 size_t start_used_bytes = used(); |
|
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|
2672 |
|
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|
2673 g1_policy()->record_collection_pause_start(start_time_sec, |
|
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|
2674 start_used_bytes); |
|
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|
2675 |
|
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|
2676 guarantee(_in_cset_fast_test == NULL, "invariant"); |
|
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|
2677 guarantee(_in_cset_fast_test_base == NULL, "invariant"); |
|
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|
2678 _in_cset_fast_test_length = max_regions(); |
|
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|
2679 _in_cset_fast_test_base = |
| 526 | 2680 NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); |
|
838
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|
2681 memset(_in_cset_fast_test_base, false, |
| 526 | 2682 _in_cset_fast_test_length * sizeof(bool)); |
|
838
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|
2683 // We're biasing _in_cset_fast_test to avoid subtracting the |
|
0316eac49d5a
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|
2684 // beginning of the heap every time we want to index; basically |
|
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|
2685 // it's the same with what we do with the card table. |
|
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|
2686 _in_cset_fast_test = _in_cset_fast_test_base - |
| 526 | 2687 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
| 2688 | |
| 342 | 2689 #if SCAN_ONLY_VERBOSE |
|
838
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|
2690 _young_list->print(); |
| 342 | 2691 #endif // SCAN_ONLY_VERBOSE |
| 2692 | |
|
838
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|
2693 if (g1_policy()->should_initiate_conc_mark()) { |
|
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|
2694 concurrent_mark()->checkpointRootsInitialPre(); |
|
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|
2695 } |
|
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|
2696 save_marks(); |
|
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|
2697 |
|
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|
2698 // We must do this before any possible evacuation that should propagate |
|
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|
2699 // marks. |
|
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|
2700 if (mark_in_progress()) { |
|
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|
2701 double start_time_sec = os::elapsedTime(); |
|
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|
2702 |
|
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|
2703 _cm->drainAllSATBBuffers(); |
|
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|
2704 double finish_mark_ms = (os::elapsedTime() - start_time_sec) * 1000.0; |
|
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|
2705 g1_policy()->record_satb_drain_time(finish_mark_ms); |
|
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|
2706 } |
|
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|
2707 // Record the number of elements currently on the mark stack, so we |
|
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|
2708 // only iterate over these. (Since evacuation may add to the mark |
|
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|
2709 // stack, doing more exposes race conditions.) If no mark is in |
|
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|
2710 // progress, this will be zero. |
|
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|
2711 _cm->set_oops_do_bound(); |
|
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|
2712 |
|
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|
2713 assert(regions_accounted_for(), "Region leakage."); |
|
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|
2714 |
|
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|
2715 if (mark_in_progress()) |
|
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|
2716 concurrent_mark()->newCSet(); |
|
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|
2717 |
|
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|
2718 // Now choose the CS. |
|
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|
2719 g1_policy()->choose_collection_set(); |
|
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|
2720 |
|
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|
2721 // We may abandon a pause if we find no region that will fit in the MMU |
|
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|
2722 // pause. |
|
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|
2723 bool abandoned = (g1_policy()->collection_set() == NULL); |
|
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|
2724 |
|
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|
2725 // Nothing to do if we were unable to choose a collection set. |
|
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|
2726 if (!abandoned) { |
| 342 | 2727 #if G1_REM_SET_LOGGING |
|
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|
2728 gclog_or_tty->print_cr("\nAfter pause, heap:"); |
|
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|
2729 print(); |
| 342 | 2730 #endif |
| 2731 | |
|
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|
2732 setup_surviving_young_words(); |
|
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2733 |
|
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|
2734 // Set up the gc allocation regions. |
|
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|
2735 get_gc_alloc_regions(); |
|
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|
2736 |
|
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|
2737 // Actually do the work... |
|
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|
2738 evacuate_collection_set(); |
|
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|
2739 free_collection_set(g1_policy()->collection_set()); |
|
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|
2740 g1_policy()->clear_collection_set(); |
|
0316eac49d5a
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|
2741 |
|
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|
2742 FREE_C_HEAP_ARRAY(bool, _in_cset_fast_test_base); |
|
0316eac49d5a
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|
2743 // this is more for peace of mind; we're nulling them here and |
|
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|
2744 // we're expecting them to be null at the beginning of the next GC |
|
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|
2745 _in_cset_fast_test = NULL; |
|
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|
2746 _in_cset_fast_test_base = NULL; |
|
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|
2747 |
|
0316eac49d5a
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|
2748 cleanup_surviving_young_words(); |
|
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|
2749 |
|
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|
2750 if (g1_policy()->in_young_gc_mode()) { |
|
0316eac49d5a
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|
2751 _young_list->reset_sampled_info(); |
|
0316eac49d5a
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|
2752 assert(check_young_list_empty(true), |
|
0316eac49d5a
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|
2753 "young list should be empty"); |
| 342 | 2754 |
| 2755 #if SCAN_ONLY_VERBOSE | |
|
838
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|
2756 _young_list->print(); |
| 342 | 2757 #endif // SCAN_ONLY_VERBOSE |
| 2758 | |
|
838
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|
2759 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
|
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|
2760 _young_list->first_survivor_region(), |
|
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|
2761 _young_list->last_survivor_region()); |
|
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|
2762 _young_list->reset_auxilary_lists(); |
|
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|
2763 } |
|
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|
2764 } else { |
|
0316eac49d5a
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|
2765 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
| 342 | 2766 } |
|
838
0316eac49d5a
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|
2767 |
|
0316eac49d5a
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|
2768 if (evacuation_failed()) { |
|
0316eac49d5a
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|
2769 _summary_bytes_used = recalculate_used(); |
|
0316eac49d5a
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|
2770 } else { |
|
0316eac49d5a
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|
2771 // The "used" of the the collection set have already been subtracted |
|
0316eac49d5a
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|
2772 // when they were freed. Add in the bytes evacuated. |
|
0316eac49d5a
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|
2773 _summary_bytes_used += g1_policy()->bytes_in_to_space(); |
|
0316eac49d5a
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|
2774 } |
|
0316eac49d5a
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|
2775 |
|
0316eac49d5a
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|
2776 if (g1_policy()->in_young_gc_mode() && |
|
0316eac49d5a
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|
2777 g1_policy()->should_initiate_conc_mark()) { |
|
0316eac49d5a
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|
2778 concurrent_mark()->checkpointRootsInitialPost(); |
|
0316eac49d5a
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|
2779 set_marking_started(); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
2780 // CAUTION: after the doConcurrentMark() call below, |
|
df6caf649ff7
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|
2781 // the concurrent marking thread(s) could be running |
|
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|
2782 // concurrently with us. Make sure that anything after |
|
df6caf649ff7
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|
2783 // this point does not assume that we are the only GC thread |
|
df6caf649ff7
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|
2784 // running. Note: of course, the actual marking work will |
|
df6caf649ff7
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|
2785 // not start until the safepoint itself is released in |
|
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|
2786 // ConcurrentGCThread::safepoint_desynchronize(). |
|
838
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|
2787 doConcurrentMark(); |
|
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|
2788 } |
| 342 | 2789 |
| 2790 #if SCAN_ONLY_VERBOSE | |
|
838
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|
2791 _young_list->print(); |
| 342 | 2792 #endif // SCAN_ONLY_VERBOSE |
| 2793 | |
|
838
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|
2794 double end_time_sec = os::elapsedTime(); |
|
0316eac49d5a
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|
2795 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
|
0316eac49d5a
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|
2796 g1_policy()->record_pause_time_ms(pause_time_ms); |
|
0316eac49d5a
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|
2797 g1_policy()->record_collection_pause_end(abandoned); |
|
0316eac49d5a
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|
2798 |
|
0316eac49d5a
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|
2799 assert(regions_accounted_for(), "Region leakage."); |
|
0316eac49d5a
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|
2800 |
|
0316eac49d5a
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|
2801 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
|
0316eac49d5a
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|
2802 HandleMark hm; // Discard invalid handles created during verification |
|
0316eac49d5a
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|
2803 gclog_or_tty->print(" VerifyAfterGC:"); |
|
0316eac49d5a
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|
2804 prepare_for_verify(); |
|
0316eac49d5a
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|
2805 Universe::verify(false); |
| 342 | 2806 } |
|
838
0316eac49d5a
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|
2807 |
|
0316eac49d5a
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|
2808 if (was_enabled) ref_processor()->enable_discovery(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2809 |
|
0316eac49d5a
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|
2810 { |
|
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|
2811 size_t expand_bytes = g1_policy()->expansion_amount(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2812 if (expand_bytes > 0) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2813 size_t bytes_before = capacity(); |
|
0316eac49d5a
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|
2814 expand(expand_bytes); |
|
0316eac49d5a
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|
2815 } |
|
0316eac49d5a
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|
2816 } |
|
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|
2817 |
|
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|
2818 if (mark_in_progress()) { |
|
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|
2819 concurrent_mark()->update_g1_committed(); |
|
0316eac49d5a
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|
2820 } |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
2821 |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
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545
diff
changeset
|
2822 #ifdef TRACESPINNING |
|
838
0316eac49d5a
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|
2823 ParallelTaskTerminator::print_termination_counts(); |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
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diff
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|
2824 #endif |
| 342 | 2825 |
|
838
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|
2826 gc_epilogue(false); |
|
0316eac49d5a
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|
2827 } |
|
0316eac49d5a
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|
2828 |
|
0316eac49d5a
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|
2829 assert(verify_region_lists(), "Bad region lists."); |
|
0316eac49d5a
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|
2830 |
|
0316eac49d5a
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|
2831 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
|
0316eac49d5a
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|
2832 gclog_or_tty->print_cr("Stopping after GC #%d", ExitAfterGCNum); |
|
0316eac49d5a
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|
2833 print_tracing_info(); |
|
0316eac49d5a
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|
2834 vm_exit(-1); |
|
0316eac49d5a
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|
2835 } |
|
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|
2836 } |
|
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|
2837 |
|
0316eac49d5a
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|
2838 if (PrintHeapAtGC) { |
|
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|
2839 Universe::print_heap_after_gc(); |
| 342 | 2840 } |
|
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
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883
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|
2841 if (G1SummarizeRSetStats && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
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|
2842 (G1SummarizeRSetStatsPeriod > 0) && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
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|
2843 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
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|
2844 g1_rem_set()->print_summary_info(); |
|
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|
2845 } |
| 342 | 2846 } |
| 2847 | |
| 2848 void G1CollectedHeap::set_gc_alloc_region(int purpose, HeapRegion* r) { | |
| 2849 assert(purpose >= 0 && purpose < GCAllocPurposeCount, "invalid purpose"); | |
| 636 | 2850 // make sure we don't call set_gc_alloc_region() multiple times on |
| 2851 // the same region | |
| 2852 assert(r == NULL || !r->is_gc_alloc_region(), | |
| 2853 "shouldn't already be a GC alloc region"); | |
| 342 | 2854 HeapWord* original_top = NULL; |
| 2855 if (r != NULL) | |
| 2856 original_top = r->top(); | |
| 2857 | |
| 2858 // We will want to record the used space in r as being there before gc. | |
| 2859 // One we install it as a GC alloc region it's eligible for allocation. | |
| 2860 // So record it now and use it later. | |
| 2861 size_t r_used = 0; | |
| 2862 if (r != NULL) { | |
| 2863 r_used = r->used(); | |
| 2864 | |
| 2865 if (ParallelGCThreads > 0) { | |
| 2866 // need to take the lock to guard against two threads calling | |
| 2867 // get_gc_alloc_region concurrently (very unlikely but...) | |
| 2868 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 2869 r->save_marks(); | |
| 2870 } | |
| 2871 } | |
| 2872 HeapRegion* old_alloc_region = _gc_alloc_regions[purpose]; | |
| 2873 _gc_alloc_regions[purpose] = r; | |
| 2874 if (old_alloc_region != NULL) { | |
| 2875 // Replace aliases too. | |
| 2876 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 2877 if (_gc_alloc_regions[ap] == old_alloc_region) { | |
| 2878 _gc_alloc_regions[ap] = r; | |
| 2879 } | |
| 2880 } | |
| 2881 } | |
| 2882 if (r != NULL) { | |
| 2883 push_gc_alloc_region(r); | |
| 2884 if (mark_in_progress() && original_top != r->next_top_at_mark_start()) { | |
| 2885 // We are using a region as a GC alloc region after it has been used | |
| 2886 // as a mutator allocation region during the current marking cycle. | |
| 2887 // The mutator-allocated objects are currently implicitly marked, but | |
| 2888 // when we move hr->next_top_at_mark_start() forward at the the end | |
| 2889 // of the GC pause, they won't be. We therefore mark all objects in | |
| 2890 // the "gap". We do this object-by-object, since marking densely | |
| 2891 // does not currently work right with marking bitmap iteration. This | |
| 2892 // means we rely on TLAB filling at the start of pauses, and no | |
| 2893 // "resuscitation" of filled TLAB's. If we want to do this, we need | |
| 2894 // to fix the marking bitmap iteration. | |
| 2895 HeapWord* curhw = r->next_top_at_mark_start(); | |
| 2896 HeapWord* t = original_top; | |
| 2897 | |
| 2898 while (curhw < t) { | |
| 2899 oop cur = (oop)curhw; | |
| 2900 // We'll assume parallel for generality. This is rare code. | |
| 2901 concurrent_mark()->markAndGrayObjectIfNecessary(cur); // can't we just mark them? | |
| 2902 curhw = curhw + cur->size(); | |
| 2903 } | |
| 2904 assert(curhw == t, "Should have parsed correctly."); | |
| 2905 } | |
| 2906 if (G1PolicyVerbose > 1) { | |
| 2907 gclog_or_tty->print("New alloc region ["PTR_FORMAT", "PTR_FORMAT", " PTR_FORMAT") " | |
| 2908 "for survivors:", r->bottom(), original_top, r->end()); | |
| 2909 r->print(); | |
| 2910 } | |
| 2911 g1_policy()->record_before_bytes(r_used); | |
| 2912 } | |
| 2913 } | |
| 2914 | |
| 2915 void G1CollectedHeap::push_gc_alloc_region(HeapRegion* hr) { | |
| 2916 assert(Thread::current()->is_VM_thread() || | |
| 2917 par_alloc_during_gc_lock()->owned_by_self(), "Precondition"); | |
| 2918 assert(!hr->is_gc_alloc_region() && !hr->in_collection_set(), | |
| 2919 "Precondition."); | |
| 2920 hr->set_is_gc_alloc_region(true); | |
| 2921 hr->set_next_gc_alloc_region(_gc_alloc_region_list); | |
| 2922 _gc_alloc_region_list = hr; | |
| 2923 } | |
| 2924 | |
| 2925 #ifdef G1_DEBUG | |
| 2926 class FindGCAllocRegion: public HeapRegionClosure { | |
| 2927 public: | |
| 2928 bool doHeapRegion(HeapRegion* r) { | |
| 2929 if (r->is_gc_alloc_region()) { | |
| 2930 gclog_or_tty->print_cr("Region %d ["PTR_FORMAT"...] is still a gc_alloc_region.", | |
| 2931 r->hrs_index(), r->bottom()); | |
| 2932 } | |
| 2933 return false; | |
| 2934 } | |
| 2935 }; | |
| 2936 #endif // G1_DEBUG | |
| 2937 | |
| 2938 void G1CollectedHeap::forget_alloc_region_list() { | |
| 2939 assert(Thread::current()->is_VM_thread(), "Precondition"); | |
| 2940 while (_gc_alloc_region_list != NULL) { | |
| 2941 HeapRegion* r = _gc_alloc_region_list; | |
| 2942 assert(r->is_gc_alloc_region(), "Invariant."); | |
|
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2943 // We need HeapRegion::oops_on_card_seq_iterate_careful() to work on |
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2944 // newly allocated data in order to be able to apply deferred updates |
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2945 // before the GC is done for verification purposes (i.e to allow |
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2946 // G1HRRSFlushLogBuffersOnVerify). It's safe thing to do after the |
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2947 // collection. |
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2948 r->ContiguousSpace::set_saved_mark(); |
| 342 | 2949 _gc_alloc_region_list = r->next_gc_alloc_region(); |
| 2950 r->set_next_gc_alloc_region(NULL); | |
| 2951 r->set_is_gc_alloc_region(false); | |
| 545 | 2952 if (r->is_survivor()) { |
| 2953 if (r->is_empty()) { | |
| 2954 r->set_not_young(); | |
| 2955 } else { | |
| 2956 _young_list->add_survivor_region(r); | |
| 2957 } | |
| 2958 } | |
| 342 | 2959 if (r->is_empty()) { |
| 2960 ++_free_regions; | |
| 2961 } | |
| 2962 } | |
| 2963 #ifdef G1_DEBUG | |
| 2964 FindGCAllocRegion fa; | |
| 2965 heap_region_iterate(&fa); | |
| 2966 #endif // G1_DEBUG | |
| 2967 } | |
| 2968 | |
| 2969 | |
| 2970 bool G1CollectedHeap::check_gc_alloc_regions() { | |
| 2971 // TODO: allocation regions check | |
| 2972 return true; | |
| 2973 } | |
| 2974 | |
| 2975 void G1CollectedHeap::get_gc_alloc_regions() { | |
| 636 | 2976 // First, let's check that the GC alloc region list is empty (it should) |
| 2977 assert(_gc_alloc_region_list == NULL, "invariant"); | |
| 2978 | |
| 342 | 2979 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
| 636 | 2980 assert(_gc_alloc_regions[ap] == NULL, "invariant"); |
|
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2981 assert(_gc_alloc_region_counts[ap] == 0, "invariant"); |
| 636 | 2982 |
| 342 | 2983 // Create new GC alloc regions. |
| 636 | 2984 HeapRegion* alloc_region = _retained_gc_alloc_regions[ap]; |
| 2985 _retained_gc_alloc_regions[ap] = NULL; | |
| 2986 | |
| 2987 if (alloc_region != NULL) { | |
| 2988 assert(_retain_gc_alloc_region[ap], "only way to retain a GC region"); | |
| 2989 | |
| 2990 // let's make sure that the GC alloc region is not tagged as such | |
| 2991 // outside a GC operation | |
| 2992 assert(!alloc_region->is_gc_alloc_region(), "sanity"); | |
| 2993 | |
| 2994 if (alloc_region->in_collection_set() || | |
| 2995 alloc_region->top() == alloc_region->end() || | |
| 2996 alloc_region->top() == alloc_region->bottom()) { | |
| 2997 // we will discard the current GC alloc region if it's in the | |
| 2998 // collection set (it can happen!), if it's already full (no | |
| 2999 // point in using it), or if it's empty (this means that it | |
| 3000 // was emptied during a cleanup and it should be on the free | |
| 3001 // list now). | |
| 3002 | |
| 3003 alloc_region = NULL; | |
| 3004 } | |
| 3005 } | |
| 3006 | |
| 3007 if (alloc_region == NULL) { | |
| 3008 // we will get a new GC alloc region | |
| 342 | 3009 alloc_region = newAllocRegionWithExpansion(ap, 0); |
|
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3010 } else { |
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3011 // the region was retained from the last collection |
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3012 ++_gc_alloc_region_counts[ap]; |
| 342 | 3013 } |
| 636 | 3014 |
| 342 | 3015 if (alloc_region != NULL) { |
| 636 | 3016 assert(_gc_alloc_regions[ap] == NULL, "pre-condition"); |
| 342 | 3017 set_gc_alloc_region(ap, alloc_region); |
| 3018 } | |
| 636 | 3019 |
| 3020 assert(_gc_alloc_regions[ap] == NULL || | |
| 3021 _gc_alloc_regions[ap]->is_gc_alloc_region(), | |
| 3022 "the GC alloc region should be tagged as such"); | |
| 3023 assert(_gc_alloc_regions[ap] == NULL || | |
| 3024 _gc_alloc_regions[ap] == _gc_alloc_region_list, | |
| 3025 "the GC alloc region should be the same as the GC alloc list head"); | |
| 342 | 3026 } |
| 3027 // Set alternative regions for allocation purposes that have reached | |
| 636 | 3028 // their limit. |
| 342 | 3029 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
| 3030 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(ap); | |
| 3031 if (_gc_alloc_regions[ap] == NULL && alt_purpose != ap) { | |
| 3032 _gc_alloc_regions[ap] = _gc_alloc_regions[alt_purpose]; | |
| 3033 } | |
| 3034 } | |
| 3035 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
| 3036 } | |
| 3037 | |
| 636 | 3038 void G1CollectedHeap::release_gc_alloc_regions(bool totally) { |
| 342 | 3039 // We keep a separate list of all regions that have been alloc regions in |
| 636 | 3040 // the current collection pause. Forget that now. This method will |
| 3041 // untag the GC alloc regions and tear down the GC alloc region | |
| 3042 // list. It's desirable that no regions are tagged as GC alloc | |
| 3043 // outside GCs. | |
| 342 | 3044 forget_alloc_region_list(); |
| 3045 | |
| 3046 // The current alloc regions contain objs that have survived | |
| 3047 // collection. Make them no longer GC alloc regions. | |
| 3048 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 3049 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 636 | 3050 _retained_gc_alloc_regions[ap] = NULL; |
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3051 _gc_alloc_region_counts[ap] = 0; |
| 636 | 3052 |
| 3053 if (r != NULL) { | |
| 3054 // we retain nothing on _gc_alloc_regions between GCs | |
| 3055 set_gc_alloc_region(ap, NULL); | |
| 3056 | |
| 3057 if (r->is_empty()) { | |
| 3058 // we didn't actually allocate anything in it; let's just put | |
| 3059 // it on the free list | |
| 342 | 3060 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); |
| 3061 r->set_zero_fill_complete(); | |
| 3062 put_free_region_on_list_locked(r); | |
| 636 | 3063 } else if (_retain_gc_alloc_region[ap] && !totally) { |
| 3064 // retain it so that we can use it at the beginning of the next GC | |
| 3065 _retained_gc_alloc_regions[ap] = r; | |
| 342 | 3066 } |
| 3067 } | |
| 636 | 3068 } |
| 3069 } | |
| 3070 | |
| 3071 #ifndef PRODUCT | |
| 3072 // Useful for debugging | |
| 3073 | |
| 3074 void G1CollectedHeap::print_gc_alloc_regions() { | |
| 3075 gclog_or_tty->print_cr("GC alloc regions"); | |
| 3076 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 3077 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 3078 if (r == NULL) { | |
| 3079 gclog_or_tty->print_cr(" %2d : "PTR_FORMAT, ap, NULL); | |
| 3080 } else { | |
| 3081 gclog_or_tty->print_cr(" %2d : "PTR_FORMAT" "SIZE_FORMAT, | |
| 3082 ap, r->bottom(), r->used()); | |
| 3083 } | |
| 3084 } | |
| 3085 } | |
| 3086 #endif // PRODUCT | |
| 342 | 3087 |
| 3088 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
| 3089 _drain_in_progress = false; | |
| 3090 set_evac_failure_closure(cl); | |
| 3091 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 3092 } | |
| 3093 | |
| 3094 void G1CollectedHeap::finalize_for_evac_failure() { | |
| 3095 assert(_evac_failure_scan_stack != NULL && | |
| 3096 _evac_failure_scan_stack->length() == 0, | |
| 3097 "Postcondition"); | |
| 3098 assert(!_drain_in_progress, "Postcondition"); | |
| 3099 // Don't have to delete, since the scan stack is a resource object. | |
| 3100 _evac_failure_scan_stack = NULL; | |
| 3101 } | |
| 3102 | |
| 3103 | |
| 3104 | |
| 3105 // *** Sequential G1 Evacuation | |
| 3106 | |
| 3107 HeapWord* G1CollectedHeap::allocate_during_gc(GCAllocPurpose purpose, size_t word_size) { | |
| 3108 HeapRegion* alloc_region = _gc_alloc_regions[purpose]; | |
| 3109 // let the caller handle alloc failure | |
| 3110 if (alloc_region == NULL) return NULL; | |
| 3111 assert(isHumongous(word_size) || !alloc_region->isHumongous(), | |
| 3112 "Either the object is humongous or the region isn't"); | |
| 3113 HeapWord* block = alloc_region->allocate(word_size); | |
| 3114 if (block == NULL) { | |
| 3115 block = allocate_during_gc_slow(purpose, alloc_region, false, word_size); | |
| 3116 } | |
| 3117 return block; | |
| 3118 } | |
| 3119 | |
| 3120 class G1IsAliveClosure: public BoolObjectClosure { | |
| 3121 G1CollectedHeap* _g1; | |
| 3122 public: | |
| 3123 G1IsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
| 3124 void do_object(oop p) { assert(false, "Do not call."); } | |
| 3125 bool do_object_b(oop p) { | |
| 3126 // It is reachable if it is outside the collection set, or is inside | |
| 3127 // and forwarded. | |
| 3128 | |
| 3129 #ifdef G1_DEBUG | |
| 3130 gclog_or_tty->print_cr("is alive "PTR_FORMAT" in CS %d forwarded %d overall %d", | |
| 3131 (void*) p, _g1->obj_in_cs(p), p->is_forwarded(), | |
| 3132 !_g1->obj_in_cs(p) || p->is_forwarded()); | |
| 3133 #endif // G1_DEBUG | |
| 3134 | |
| 3135 return !_g1->obj_in_cs(p) || p->is_forwarded(); | |
| 3136 } | |
| 3137 }; | |
| 3138 | |
| 3139 class G1KeepAliveClosure: public OopClosure { | |
| 3140 G1CollectedHeap* _g1; | |
| 3141 public: | |
| 3142 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
|
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3143 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
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3144 void do_oop( oop* p) { |
| 342 | 3145 oop obj = *p; |
| 3146 #ifdef G1_DEBUG | |
| 3147 if (PrintGC && Verbose) { | |
| 3148 gclog_or_tty->print_cr("keep alive *"PTR_FORMAT" = "PTR_FORMAT" "PTR_FORMAT, | |
| 3149 p, (void*) obj, (void*) *p); | |
| 3150 } | |
| 3151 #endif // G1_DEBUG | |
| 3152 | |
| 3153 if (_g1->obj_in_cs(obj)) { | |
| 3154 assert( obj->is_forwarded(), "invariant" ); | |
| 3155 *p = obj->forwardee(); | |
| 3156 #ifdef G1_DEBUG | |
| 3157 gclog_or_tty->print_cr(" in CSet: moved "PTR_FORMAT" -> "PTR_FORMAT, | |
| 3158 (void*) obj, (void*) *p); | |
| 3159 #endif // G1_DEBUG | |
| 3160 } | |
| 3161 } | |
| 3162 }; | |
| 3163 | |
|
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3164 class UpdateRSetImmediate : public OopsInHeapRegionClosure { |
| 342 | 3165 private: |
| 3166 G1CollectedHeap* _g1; | |
| 3167 G1RemSet* _g1_rem_set; | |
| 3168 public: | |
|
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3169 UpdateRSetImmediate(G1CollectedHeap* g1) : |
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3170 _g1(g1), _g1_rem_set(g1->g1_rem_set()) {} |
| 342 | 3171 |
|
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3172 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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3173 virtual void do_oop( oop* p) { do_oop_work(p); } |
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3174 template <class T> void do_oop_work(T* p) { |
| 342 | 3175 assert(_from->is_in_reserved(p), "paranoia"); |
|
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3176 T heap_oop = oopDesc::load_heap_oop(p); |
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3177 if (!oopDesc::is_null(heap_oop) && !_from->is_survivor()) { |
|
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3178 _g1_rem_set->par_write_ref(_from, p, 0); |
| 342 | 3179 } |
| 3180 } | |
| 3181 }; | |
| 3182 | |
|
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3183 class UpdateRSetDeferred : public OopsInHeapRegionClosure { |
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3184 private: |
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3185 G1CollectedHeap* _g1; |
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3186 DirtyCardQueue *_dcq; |
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3187 CardTableModRefBS* _ct_bs; |
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3188 |
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3189 public: |
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3190 UpdateRSetDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
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3191 _g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) {} |
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3192 |
|
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3193 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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3194 virtual void do_oop( oop* p) { do_oop_work(p); } |
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3195 template <class T> void do_oop_work(T* p) { |
|
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3196 assert(_from->is_in_reserved(p), "paranoia"); |
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3197 if (!_from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && |
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3198 !_from->is_survivor()) { |
|
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3199 size_t card_index = _ct_bs->index_for(p); |
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3200 if (_ct_bs->mark_card_deferred(card_index)) { |
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3201 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
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3202 } |
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3203 } |
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3204 } |
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3205 }; |
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3206 |
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3207 |
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3208 |
| 342 | 3209 class RemoveSelfPointerClosure: public ObjectClosure { |
| 3210 private: | |
| 3211 G1CollectedHeap* _g1; | |
| 3212 ConcurrentMark* _cm; | |
| 3213 HeapRegion* _hr; | |
| 3214 size_t _prev_marked_bytes; | |
| 3215 size_t _next_marked_bytes; | |
|
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3216 OopsInHeapRegionClosure *_cl; |
| 342 | 3217 public: |
|
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3218 RemoveSelfPointerClosure(G1CollectedHeap* g1, OopsInHeapRegionClosure* cl) : |
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3219 _g1(g1), _cm(_g1->concurrent_mark()), _prev_marked_bytes(0), |
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3220 _next_marked_bytes(0), _cl(cl) {} |
| 342 | 3221 |
| 3222 size_t prev_marked_bytes() { return _prev_marked_bytes; } | |
| 3223 size_t next_marked_bytes() { return _next_marked_bytes; } | |
| 3224 | |
|
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3225 // The original idea here was to coalesce evacuated and dead objects. |
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3226 // However that caused complications with the block offset table (BOT). |
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3227 // In particular if there were two TLABs, one of them partially refined. |
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3228 // |----- TLAB_1--------|----TLAB_2-~~~(partially refined part)~~~| |
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3229 // The BOT entries of the unrefined part of TLAB_2 point to the start |
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3230 // of TLAB_2. If the last object of the TLAB_1 and the first object |
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3231 // of TLAB_2 are coalesced, then the cards of the unrefined part |
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3232 // would point into middle of the filler object. |
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3233 // |
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3234 // The current approach is to not coalesce and leave the BOT contents intact. |
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3235 void do_object(oop obj) { |
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3236 if (obj->is_forwarded() && obj->forwardee() == obj) { |
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3237 // The object failed to move. |
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3238 assert(!_g1->is_obj_dead(obj), "We should not be preserving dead objs."); |
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3239 _cm->markPrev(obj); |
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3240 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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3241 _prev_marked_bytes += (obj->size() * HeapWordSize); |
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3242 if (_g1->mark_in_progress() && !_g1->is_obj_ill(obj)) { |
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3243 _cm->markAndGrayObjectIfNecessary(obj); |
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3244 } |
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3245 obj->set_mark(markOopDesc::prototype()); |
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3246 // While we were processing RSet buffers during the |
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3247 // collection, we actually didn't scan any cards on the |
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3248 // collection set, since we didn't want to update remebered |
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3249 // sets with entries that point into the collection set, given |
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3250 // that live objects fromthe collection set are about to move |
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3251 // and such entries will be stale very soon. This change also |
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3252 // dealt with a reliability issue which involved scanning a |
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3253 // card in the collection set and coming across an array that |
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3254 // was being chunked and looking malformed. The problem is |
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3255 // that, if evacuation fails, we might have remembered set |
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3256 // entries missing given that we skipped cards on the |
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3257 // collection set. So, we'll recreate such entries now. |
|
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3258 obj->oop_iterate(_cl); |
|
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3259 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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3260 } else { |
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3261 // The object has been either evacuated or is dead. Fill it with a |
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3262 // dummy object. |
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3263 MemRegion mr((HeapWord*)obj, obj->size()); |
|
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3264 CollectedHeap::fill_with_object(mr); |
| 342 | 3265 _cm->clearRangeBothMaps(mr); |
| 3266 } | |
| 3267 } | |
| 3268 }; | |
| 3269 | |
| 3270 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
|
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3271 UpdateRSetImmediate immediate_update(_g1h); |
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3272 DirtyCardQueue dcq(&_g1h->dirty_card_queue_set()); |
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3273 UpdateRSetDeferred deferred_update(_g1h, &dcq); |
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3274 OopsInHeapRegionClosure *cl; |
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3275 if (G1DeferredRSUpdate) { |
|
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3276 cl = &deferred_update; |
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3277 } else { |
|
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3278 cl = &immediate_update; |
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3279 } |
| 342 | 3280 HeapRegion* cur = g1_policy()->collection_set(); |
| 3281 while (cur != NULL) { | |
| 3282 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
| 3283 | |
|
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3284 RemoveSelfPointerClosure rspc(_g1h, cl); |
| 342 | 3285 if (cur->evacuation_failed()) { |
| 3286 assert(cur->in_collection_set(), "bad CS"); | |
|
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3287 cl->set_region(cur); |
| 342 | 3288 cur->object_iterate(&rspc); |
| 3289 | |
| 3290 // A number of manipulations to make the TAMS be the current top, | |
| 3291 // and the marked bytes be the ones observed in the iteration. | |
| 3292 if (_g1h->concurrent_mark()->at_least_one_mark_complete()) { | |
| 3293 // The comments below are the postconditions achieved by the | |
| 3294 // calls. Note especially the last such condition, which says that | |
| 3295 // the count of marked bytes has been properly restored. | |
| 3296 cur->note_start_of_marking(false); | |
| 3297 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
| 3298 cur->add_to_marked_bytes(rspc.prev_marked_bytes()); | |
| 3299 // _next_marked_bytes == prev_marked_bytes. | |
| 3300 cur->note_end_of_marking(); | |
| 3301 // _prev_top_at_mark_start == top(), | |
| 3302 // _prev_marked_bytes == prev_marked_bytes | |
| 3303 } | |
| 3304 // If there is no mark in progress, we modified the _next variables | |
| 3305 // above needlessly, but harmlessly. | |
| 3306 if (_g1h->mark_in_progress()) { | |
| 3307 cur->note_start_of_marking(false); | |
| 3308 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
| 3309 // _next_marked_bytes == next_marked_bytes. | |
| 3310 } | |
| 3311 | |
| 3312 // Now make sure the region has the right index in the sorted array. | |
| 3313 g1_policy()->note_change_in_marked_bytes(cur); | |
| 3314 } | |
| 3315 cur = cur->next_in_collection_set(); | |
| 3316 } | |
| 3317 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
| 3318 | |
| 3319 // Now restore saved marks, if any. | |
| 3320 if (_objs_with_preserved_marks != NULL) { | |
| 3321 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
| 3322 assert(_objs_with_preserved_marks->length() == | |
| 3323 _preserved_marks_of_objs->length(), "Both or none."); | |
| 3324 guarantee(_objs_with_preserved_marks->length() == | |
| 3325 _preserved_marks_of_objs->length(), "Both or none."); | |
| 3326 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
| 3327 oop obj = _objs_with_preserved_marks->at(i); | |
| 3328 markOop m = _preserved_marks_of_objs->at(i); | |
| 3329 obj->set_mark(m); | |
| 3330 } | |
| 3331 // Delete the preserved marks growable arrays (allocated on the C heap). | |
| 3332 delete _objs_with_preserved_marks; | |
| 3333 delete _preserved_marks_of_objs; | |
| 3334 _objs_with_preserved_marks = NULL; | |
| 3335 _preserved_marks_of_objs = NULL; | |
| 3336 } | |
| 3337 } | |
| 3338 | |
| 3339 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
| 3340 _evac_failure_scan_stack->push(obj); | |
| 3341 } | |
| 3342 | |
| 3343 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
| 3344 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
| 3345 | |
| 3346 while (_evac_failure_scan_stack->length() > 0) { | |
| 3347 oop obj = _evac_failure_scan_stack->pop(); | |
| 3348 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
| 3349 obj->oop_iterate_backwards(_evac_failure_closure); | |
| 3350 } | |
| 3351 } | |
| 3352 | |
| 3353 void G1CollectedHeap::handle_evacuation_failure(oop old) { | |
| 3354 markOop m = old->mark(); | |
| 3355 // forward to self | |
| 3356 assert(!old->is_forwarded(), "precondition"); | |
| 3357 | |
| 3358 old->forward_to(old); | |
| 3359 handle_evacuation_failure_common(old, m); | |
| 3360 } | |
| 3361 | |
| 3362 oop | |
| 3363 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
| 3364 oop old) { | |
| 3365 markOop m = old->mark(); | |
| 3366 oop forward_ptr = old->forward_to_atomic(old); | |
| 3367 if (forward_ptr == NULL) { | |
| 3368 // Forward-to-self succeeded. | |
| 3369 if (_evac_failure_closure != cl) { | |
| 3370 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
| 3371 assert(!_drain_in_progress, | |
| 3372 "Should only be true while someone holds the lock."); | |
| 3373 // Set the global evac-failure closure to the current thread's. | |
| 3374 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
| 3375 set_evac_failure_closure(cl); | |
| 3376 // Now do the common part. | |
| 3377 handle_evacuation_failure_common(old, m); | |
| 3378 // Reset to NULL. | |
| 3379 set_evac_failure_closure(NULL); | |
| 3380 } else { | |
| 3381 // The lock is already held, and this is recursive. | |
| 3382 assert(_drain_in_progress, "This should only be the recursive case."); | |
| 3383 handle_evacuation_failure_common(old, m); | |
| 3384 } | |
| 3385 return old; | |
| 3386 } else { | |
| 3387 // Someone else had a place to copy it. | |
| 3388 return forward_ptr; | |
| 3389 } | |
| 3390 } | |
| 3391 | |
| 3392 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
| 3393 set_evacuation_failed(true); | |
| 3394 | |
| 3395 preserve_mark_if_necessary(old, m); | |
| 3396 | |
| 3397 HeapRegion* r = heap_region_containing(old); | |
| 3398 if (!r->evacuation_failed()) { | |
| 3399 r->set_evacuation_failed(true); | |
| 751 | 3400 if (G1PrintRegions) { |
| 342 | 3401 gclog_or_tty->print("evacuation failed in heap region "PTR_FORMAT" " |
| 3402 "["PTR_FORMAT","PTR_FORMAT")\n", | |
| 3403 r, r->bottom(), r->end()); | |
| 3404 } | |
| 3405 } | |
| 3406 | |
| 3407 push_on_evac_failure_scan_stack(old); | |
| 3408 | |
| 3409 if (!_drain_in_progress) { | |
| 3410 // prevent recursion in copy_to_survivor_space() | |
| 3411 _drain_in_progress = true; | |
| 3412 drain_evac_failure_scan_stack(); | |
| 3413 _drain_in_progress = false; | |
| 3414 } | |
| 3415 } | |
| 3416 | |
| 3417 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
| 3418 if (m != markOopDesc::prototype()) { | |
| 3419 if (_objs_with_preserved_marks == NULL) { | |
| 3420 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
| 3421 _objs_with_preserved_marks = | |
| 3422 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 3423 _preserved_marks_of_objs = | |
| 3424 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
| 3425 } | |
| 3426 _objs_with_preserved_marks->push(obj); | |
| 3427 _preserved_marks_of_objs->push(m); | |
| 3428 } | |
| 3429 } | |
| 3430 | |
| 3431 // *** Parallel G1 Evacuation | |
| 3432 | |
| 3433 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
| 3434 size_t word_size) { | |
| 3435 HeapRegion* alloc_region = _gc_alloc_regions[purpose]; | |
| 3436 // let the caller handle alloc failure | |
| 3437 if (alloc_region == NULL) return NULL; | |
| 3438 | |
| 3439 HeapWord* block = alloc_region->par_allocate(word_size); | |
| 3440 if (block == NULL) { | |
| 3441 MutexLockerEx x(par_alloc_during_gc_lock(), | |
| 3442 Mutex::_no_safepoint_check_flag); | |
| 3443 block = allocate_during_gc_slow(purpose, alloc_region, true, word_size); | |
| 3444 } | |
| 3445 return block; | |
| 3446 } | |
| 3447 | |
| 545 | 3448 void G1CollectedHeap::retire_alloc_region(HeapRegion* alloc_region, |
| 3449 bool par) { | |
| 3450 // Another thread might have obtained alloc_region for the given | |
| 3451 // purpose, and might be attempting to allocate in it, and might | |
| 3452 // succeed. Therefore, we can't do the "finalization" stuff on the | |
| 3453 // region below until we're sure the last allocation has happened. | |
| 3454 // We ensure this by allocating the remaining space with a garbage | |
| 3455 // object. | |
| 3456 if (par) par_allocate_remaining_space(alloc_region); | |
| 3457 // Now we can do the post-GC stuff on the region. | |
| 3458 alloc_region->note_end_of_copying(); | |
| 3459 g1_policy()->record_after_bytes(alloc_region->used()); | |
| 3460 } | |
| 3461 | |
| 342 | 3462 HeapWord* |
| 3463 G1CollectedHeap::allocate_during_gc_slow(GCAllocPurpose purpose, | |
| 3464 HeapRegion* alloc_region, | |
| 3465 bool par, | |
| 3466 size_t word_size) { | |
| 3467 HeapWord* block = NULL; | |
| 3468 // In the parallel case, a previous thread to obtain the lock may have | |
| 3469 // already assigned a new gc_alloc_region. | |
| 3470 if (alloc_region != _gc_alloc_regions[purpose]) { | |
| 3471 assert(par, "But should only happen in parallel case."); | |
| 3472 alloc_region = _gc_alloc_regions[purpose]; | |
| 3473 if (alloc_region == NULL) return NULL; | |
| 3474 block = alloc_region->par_allocate(word_size); | |
| 3475 if (block != NULL) return block; | |
| 3476 // Otherwise, continue; this new region is empty, too. | |
| 3477 } | |
| 3478 assert(alloc_region != NULL, "We better have an allocation region"); | |
| 545 | 3479 retire_alloc_region(alloc_region, par); |
| 342 | 3480 |
| 3481 if (_gc_alloc_region_counts[purpose] >= g1_policy()->max_regions(purpose)) { | |
| 3482 // Cannot allocate more regions for the given purpose. | |
| 3483 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(purpose); | |
| 3484 // Is there an alternative? | |
| 3485 if (purpose != alt_purpose) { | |
| 3486 HeapRegion* alt_region = _gc_alloc_regions[alt_purpose]; | |
| 3487 // Has not the alternative region been aliased? | |
| 545 | 3488 if (alloc_region != alt_region && alt_region != NULL) { |
| 342 | 3489 // Try to allocate in the alternative region. |
| 3490 if (par) { | |
| 3491 block = alt_region->par_allocate(word_size); | |
| 3492 } else { | |
| 3493 block = alt_region->allocate(word_size); | |
| 3494 } | |
| 3495 // Make an alias. | |
| 3496 _gc_alloc_regions[purpose] = _gc_alloc_regions[alt_purpose]; | |
| 545 | 3497 if (block != NULL) { |
| 3498 return block; | |
| 3499 } | |
| 3500 retire_alloc_region(alt_region, par); | |
| 342 | 3501 } |
| 3502 // Both the allocation region and the alternative one are full | |
| 3503 // and aliased, replace them with a new allocation region. | |
| 3504 purpose = alt_purpose; | |
| 3505 } else { | |
| 3506 set_gc_alloc_region(purpose, NULL); | |
| 3507 return NULL; | |
| 3508 } | |
| 3509 } | |
| 3510 | |
| 3511 // Now allocate a new region for allocation. | |
| 3512 alloc_region = newAllocRegionWithExpansion(purpose, word_size, false /*zero_filled*/); | |
| 3513 | |
| 3514 // let the caller handle alloc failure | |
| 3515 if (alloc_region != NULL) { | |
| 3516 | |
| 3517 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
| 3518 assert(alloc_region->saved_mark_at_top(), | |
| 3519 "Mark should have been saved already."); | |
| 3520 // We used to assert that the region was zero-filled here, but no | |
| 3521 // longer. | |
| 3522 | |
| 3523 // This must be done last: once it's installed, other regions may | |
| 3524 // allocate in it (without holding the lock.) | |
| 3525 set_gc_alloc_region(purpose, alloc_region); | |
| 3526 | |
| 3527 if (par) { | |
| 3528 block = alloc_region->par_allocate(word_size); | |
| 3529 } else { | |
| 3530 block = alloc_region->allocate(word_size); | |
| 3531 } | |
| 3532 // Caller handles alloc failure. | |
| 3533 } else { | |
| 3534 // This sets other apis using the same old alloc region to NULL, also. | |
| 3535 set_gc_alloc_region(purpose, NULL); | |
| 3536 } | |
| 3537 return block; // May be NULL. | |
| 3538 } | |
| 3539 | |
| 3540 void G1CollectedHeap::par_allocate_remaining_space(HeapRegion* r) { | |
| 3541 HeapWord* block = NULL; | |
| 3542 size_t free_words; | |
| 3543 do { | |
| 3544 free_words = r->free()/HeapWordSize; | |
| 3545 // If there's too little space, no one can allocate, so we're done. | |
| 3546 if (free_words < (size_t)oopDesc::header_size()) return; | |
| 3547 // Otherwise, try to claim it. | |
| 3548 block = r->par_allocate(free_words); | |
| 3549 } while (block == NULL); | |
|
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3550 fill_with_object(block, free_words); |
| 342 | 3551 } |
| 3552 | |
| 3553 #ifndef PRODUCT | |
| 3554 bool GCLabBitMapClosure::do_bit(size_t offset) { | |
| 3555 HeapWord* addr = _bitmap->offsetToHeapWord(offset); | |
| 3556 guarantee(_cm->isMarked(oop(addr)), "it should be!"); | |
| 3557 return true; | |
| 3558 } | |
| 3559 #endif // PRODUCT | |
| 3560 | |
|
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3561 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) |
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3562 : _g1h(g1h), |
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3563 _refs(g1h->task_queue(queue_num)), |
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3564 _dcq(&g1h->dirty_card_queue_set()), |
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3565 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
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3566 _g1_rem(g1h->g1_rem_set()), |
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3567 _hash_seed(17), _queue_num(queue_num), |
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3568 _term_attempts(0), |
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3569 _age_table(false), |
| 342 | 3570 #if G1_DETAILED_STATS |
|
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3571 _pushes(0), _pops(0), _steals(0), |
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3572 _steal_attempts(0), _overflow_pushes(0), |
| 342 | 3573 #endif |
|
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3574 _strong_roots_time(0), _term_time(0), |
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3575 _alloc_buffer_waste(0), _undo_waste(0) |
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3576 { |
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3577 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
|
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3578 // we "sacrifice" entry 0 to keep track of surviving bytes for |
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3579 // non-young regions (where the age is -1) |
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3580 // We also add a few elements at the beginning and at the end in |
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3581 // an attempt to eliminate cache contention |
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3582 size_t real_length = 1 + _g1h->g1_policy()->young_cset_length(); |
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3583 size_t array_length = PADDING_ELEM_NUM + |
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3584 real_length + |
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3585 PADDING_ELEM_NUM; |
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3586 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); |
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3587 if (_surviving_young_words_base == NULL) |
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3588 vm_exit_out_of_memory(array_length * sizeof(size_t), |
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3589 "Not enough space for young surv histo."); |
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3590 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; |
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3591 memset(_surviving_young_words, 0, real_length * sizeof(size_t)); |
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3592 |
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3593 _overflowed_refs = new OverflowQueue(10); |
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3594 |
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3595 _start = os::elapsedTime(); |
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3596 } |
| 342 | 3597 |
| 3598 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : | |
| 3599 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), | |
| 3600 _par_scan_state(par_scan_state) { } | |
| 3601 | |
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3602 template <class T> void G1ParCopyHelper::mark_forwardee(T* p) { |
| 342 | 3603 // This is called _after_ do_oop_work has been called, hence after |
| 3604 // the object has been relocated to its new location and *p points | |
| 3605 // to its new location. | |
| 3606 | |
|
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3607 T heap_oop = oopDesc::load_heap_oop(p); |
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3608 if (!oopDesc::is_null(heap_oop)) { |
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3609 oop obj = oopDesc::decode_heap_oop(heap_oop); |
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3610 assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj)), |
| 342 | 3611 "shouldn't still be in the CSet if evacuation didn't fail."); |
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3612 HeapWord* addr = (HeapWord*)obj; |
| 342 | 3613 if (_g1->is_in_g1_reserved(addr)) |
| 3614 _cm->grayRoot(oop(addr)); | |
| 3615 } | |
| 3616 } | |
| 3617 | |
| 3618 oop G1ParCopyHelper::copy_to_survivor_space(oop old) { | |
| 3619 size_t word_sz = old->size(); | |
| 3620 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
| 3621 // +1 to make the -1 indexes valid... | |
| 3622 int young_index = from_region->young_index_in_cset()+1; | |
| 3623 assert( (from_region->is_young() && young_index > 0) || | |
| 3624 (!from_region->is_young() && young_index == 0), "invariant" ); | |
| 3625 G1CollectorPolicy* g1p = _g1->g1_policy(); | |
| 3626 markOop m = old->mark(); | |
| 545 | 3627 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
| 3628 : m->age(); | |
| 3629 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
| 342 | 3630 word_sz); |
| 3631 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
| 3632 oop obj = oop(obj_ptr); | |
| 3633 | |
| 3634 if (obj_ptr == NULL) { | |
| 3635 // This will either forward-to-self, or detect that someone else has | |
| 3636 // installed a forwarding pointer. | |
| 3637 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
| 3638 return _g1->handle_evacuation_failure_par(cl, old); | |
| 3639 } | |
| 3640 | |
| 526 | 3641 // We're going to allocate linearly, so might as well prefetch ahead. |
| 3642 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
| 3643 | |
| 342 | 3644 oop forward_ptr = old->forward_to_atomic(obj); |
| 3645 if (forward_ptr == NULL) { | |
| 3646 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
| 526 | 3647 if (g1p->track_object_age(alloc_purpose)) { |
| 3648 // We could simply do obj->incr_age(). However, this causes a | |
| 3649 // performance issue. obj->incr_age() will first check whether | |
| 3650 // the object has a displaced mark by checking its mark word; | |
| 3651 // getting the mark word from the new location of the object | |
| 3652 // stalls. So, given that we already have the mark word and we | |
| 3653 // are about to install it anyway, it's better to increase the | |
| 3654 // age on the mark word, when the object does not have a | |
| 3655 // displaced mark word. We're not expecting many objects to have | |
| 3656 // a displaced marked word, so that case is not optimized | |
| 3657 // further (it could be...) and we simply call obj->incr_age(). | |
| 3658 | |
| 3659 if (m->has_displaced_mark_helper()) { | |
| 3660 // in this case, we have to install the mark word first, | |
| 3661 // otherwise obj looks to be forwarded (the old mark word, | |
| 3662 // which contains the forward pointer, was copied) | |
| 3663 obj->set_mark(m); | |
| 3664 obj->incr_age(); | |
| 3665 } else { | |
| 3666 m = m->incr_age(); | |
| 545 | 3667 obj->set_mark(m); |
| 526 | 3668 } |
| 545 | 3669 _par_scan_state->age_table()->add(obj, word_sz); |
| 3670 } else { | |
| 3671 obj->set_mark(m); | |
| 526 | 3672 } |
| 3673 | |
| 342 | 3674 // preserve "next" mark bit |
| 3675 if (_g1->mark_in_progress() && !_g1->is_obj_ill(old)) { | |
| 3676 if (!use_local_bitmaps || | |
| 3677 !_par_scan_state->alloc_buffer(alloc_purpose)->mark(obj_ptr)) { | |
| 3678 // if we couldn't mark it on the local bitmap (this happens when | |
| 3679 // the object was not allocated in the GCLab), we have to bite | |
| 3680 // the bullet and do the standard parallel mark | |
| 3681 _cm->markAndGrayObjectIfNecessary(obj); | |
| 3682 } | |
| 3683 #if 1 | |
| 3684 if (_g1->isMarkedNext(old)) { | |
| 3685 _cm->nextMarkBitMap()->parClear((HeapWord*)old); | |
| 3686 } | |
| 3687 #endif | |
| 3688 } | |
| 3689 | |
| 3690 size_t* surv_young_words = _par_scan_state->surviving_young_words(); | |
| 3691 surv_young_words[young_index] += word_sz; | |
| 3692 | |
| 3693 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
| 3694 arrayOop(old)->set_length(0); | |
|
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3695 oop* old_p = set_partial_array_mask(old); |
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3696 _par_scan_state->push_on_queue(old_p); |
| 342 | 3697 } else { |
| 526 | 3698 // No point in using the slower heap_region_containing() method, |
| 3699 // given that we know obj is in the heap. | |
| 3700 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
| 342 | 3701 obj->oop_iterate_backwards(_scanner); |
| 3702 } | |
| 3703 } else { | |
| 3704 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
| 3705 obj = forward_ptr; | |
| 3706 } | |
| 3707 return obj; | |
| 3708 } | |
| 3709 | |
|
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3710 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_forwardee, bool skip_cset_test> |
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3711 template <class T> |
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3712 void G1ParCopyClosure <do_gen_barrier, barrier, do_mark_forwardee, skip_cset_test> |
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3713 ::do_oop_work(T* p) { |
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3714 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 3715 assert(barrier != G1BarrierRS || obj != NULL, |
| 3716 "Precondition: G1BarrierRS implies obj is nonNull"); | |
| 3717 | |
| 526 | 3718 // The only time we skip the cset test is when we're scanning |
| 3719 // references popped from the queue. And we only push on the queue | |
| 3720 // references that we know point into the cset, so no point in | |
| 3721 // checking again. But we'll leave an assert here for peace of mind. | |
| 3722 assert(!skip_cset_test || _g1->obj_in_cs(obj), "invariant"); | |
| 3723 | |
| 3724 // here the null check is implicit in the cset_fast_test() test | |
| 3725 if (skip_cset_test || _g1->in_cset_fast_test(obj)) { | |
| 342 | 3726 #if G1_REM_SET_LOGGING |
| 526 | 3727 gclog_or_tty->print_cr("Loc "PTR_FORMAT" contains pointer "PTR_FORMAT" " |
| 3728 "into CS.", p, (void*) obj); | |
| 342 | 3729 #endif |
| 526 | 3730 if (obj->is_forwarded()) { |
|
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3731 oopDesc::encode_store_heap_oop(p, obj->forwardee()); |
| 526 | 3732 } else { |
|
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3733 oop copy_oop = copy_to_survivor_space(obj); |
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3734 oopDesc::encode_store_heap_oop(p, copy_oop); |
| 342 | 3735 } |
| 526 | 3736 // When scanning the RS, we only care about objs in CS. |
| 3737 if (barrier == G1BarrierRS) { | |
|
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3738 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 342 | 3739 } |
| 526 | 3740 } |
| 3741 | |
| 3742 // When scanning moved objs, must look at all oops. | |
| 3743 if (barrier == G1BarrierEvac && obj != NULL) { | |
|
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3744 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 526 | 3745 } |
| 3746 | |
| 3747 if (do_gen_barrier && obj != NULL) { | |
| 3748 par_do_barrier(p); | |
| 3749 } | |
| 3750 } | |
| 3751 | |
| 3752 template void G1ParCopyClosure<false, G1BarrierEvac, false, true>::do_oop_work(oop* p); | |
|
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3753 template void G1ParCopyClosure<false, G1BarrierEvac, false, true>::do_oop_work(narrowOop* p); |
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3754 |
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3755 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
| 526 | 3756 assert(has_partial_array_mask(p), "invariant"); |
| 3757 oop old = clear_partial_array_mask(p); | |
| 342 | 3758 assert(old->is_objArray(), "must be obj array"); |
| 3759 assert(old->is_forwarded(), "must be forwarded"); | |
| 3760 assert(Universe::heap()->is_in_reserved(old), "must be in heap."); | |
| 3761 | |
| 3762 objArrayOop obj = objArrayOop(old->forwardee()); | |
| 3763 assert((void*)old != (void*)old->forwardee(), "self forwarding here?"); | |
| 3764 // Process ParGCArrayScanChunk elements now | |
| 3765 // and push the remainder back onto queue | |
| 3766 int start = arrayOop(old)->length(); | |
| 3767 int end = obj->length(); | |
| 3768 int remainder = end - start; | |
| 3769 assert(start <= end, "just checking"); | |
| 3770 if (remainder > 2 * ParGCArrayScanChunk) { | |
| 3771 // Test above combines last partial chunk with a full chunk | |
| 3772 end = start + ParGCArrayScanChunk; | |
| 3773 arrayOop(old)->set_length(end); | |
| 3774 // Push remainder. | |
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3775 oop* old_p = set_partial_array_mask(old); |
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3776 assert(arrayOop(old)->length() < obj->length(), "Empty push?"); |
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3777 _par_scan_state->push_on_queue(old_p); |
| 342 | 3778 } else { |
| 3779 // Restore length so that the heap remains parsable in | |
| 3780 // case of evacuation failure. | |
| 3781 arrayOop(old)->set_length(end); | |
| 3782 } | |
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3783 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
| 342 | 3784 // process our set of indices (include header in first chunk) |
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3785 obj->oop_iterate_range(&_scanner, start, end); |
| 342 | 3786 } |
| 3787 | |
| 3788 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
| 3789 protected: | |
| 3790 G1CollectedHeap* _g1h; | |
| 3791 G1ParScanThreadState* _par_scan_state; | |
| 3792 RefToScanQueueSet* _queues; | |
| 3793 ParallelTaskTerminator* _terminator; | |
| 3794 | |
| 3795 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
| 3796 RefToScanQueueSet* queues() { return _queues; } | |
| 3797 ParallelTaskTerminator* terminator() { return _terminator; } | |
| 3798 | |
| 3799 public: | |
| 3800 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
| 3801 G1ParScanThreadState* par_scan_state, | |
| 3802 RefToScanQueueSet* queues, | |
| 3803 ParallelTaskTerminator* terminator) | |
| 3804 : _g1h(g1h), _par_scan_state(par_scan_state), | |
| 3805 _queues(queues), _terminator(terminator) {} | |
| 3806 | |
| 3807 void do_void() { | |
| 3808 G1ParScanThreadState* pss = par_scan_state(); | |
| 3809 while (true) { | |
| 3810 pss->trim_queue(); | |
| 3811 IF_G1_DETAILED_STATS(pss->note_steal_attempt()); | |
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3812 |
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3813 StarTask stolen_task; |
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3814 if (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
| 342 | 3815 IF_G1_DETAILED_STATS(pss->note_steal()); |
| 526 | 3816 |
| 3817 // slightly paranoid tests; I'm trying to catch potential | |
| 3818 // problems before we go into push_on_queue to know where the | |
| 3819 // problem is coming from | |
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3820 assert((oop*)stolen_task != NULL, "Error"); |
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3821 if (stolen_task.is_narrow()) { |
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3822 assert(UseCompressedOops, "Error"); |
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3823 narrowOop* p = (narrowOop*) stolen_task; |
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3824 assert(has_partial_array_mask(p) || |
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3825 _g1h->obj_in_cs(oopDesc::load_decode_heap_oop(p)), "Error"); |
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3826 pss->push_on_queue(p); |
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3827 } else { |
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3828 oop* p = (oop*) stolen_task; |
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3829 assert(has_partial_array_mask(p) || _g1h->obj_in_cs(*p), "Error"); |
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3830 pss->push_on_queue(p); |
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3831 } |
| 342 | 3832 continue; |
| 3833 } | |
| 3834 pss->start_term_time(); | |
| 3835 if (terminator()->offer_termination()) break; | |
| 3836 pss->end_term_time(); | |
| 3837 } | |
| 3838 pss->end_term_time(); | |
| 3839 pss->retire_alloc_buffers(); | |
| 3840 } | |
| 3841 }; | |
| 3842 | |
| 3843 class G1ParTask : public AbstractGangTask { | |
| 3844 protected: | |
| 3845 G1CollectedHeap* _g1h; | |
| 3846 RefToScanQueueSet *_queues; | |
| 3847 ParallelTaskTerminator _terminator; | |
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3848 int _n_workers; |
| 342 | 3849 |
| 3850 Mutex _stats_lock; | |
| 3851 Mutex* stats_lock() { return &_stats_lock; } | |
| 3852 | |
| 3853 size_t getNCards() { | |
| 3854 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
| 3855 / G1BlockOffsetSharedArray::N_bytes; | |
| 3856 } | |
| 3857 | |
| 3858 public: | |
| 3859 G1ParTask(G1CollectedHeap* g1h, int workers, RefToScanQueueSet *task_queues) | |
| 3860 : AbstractGangTask("G1 collection"), | |
| 3861 _g1h(g1h), | |
| 3862 _queues(task_queues), | |
| 3863 _terminator(workers, _queues), | |
|
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3864 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true), |
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3865 _n_workers(workers) |
| 342 | 3866 {} |
| 3867 | |
| 3868 RefToScanQueueSet* queues() { return _queues; } | |
| 3869 | |
| 3870 RefToScanQueue *work_queue(int i) { | |
| 3871 return queues()->queue(i); | |
| 3872 } | |
| 3873 | |
| 3874 void work(int i) { | |
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3875 if (i >= _n_workers) return; // no work needed this round |
| 342 | 3876 ResourceMark rm; |
| 3877 HandleMark hm; | |
| 3878 | |
| 526 | 3879 G1ParScanThreadState pss(_g1h, i); |
| 3880 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss); | |
| 3881 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss); | |
| 3882 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss); | |
| 342 | 3883 |
| 3884 pss.set_evac_closure(&scan_evac_cl); | |
| 3885 pss.set_evac_failure_closure(&evac_failure_cl); | |
| 3886 pss.set_partial_scan_closure(&partial_scan_cl); | |
| 3887 | |
| 3888 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss); | |
| 3889 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss); | |
| 3890 G1ParScanHeapRSClosure only_scan_heap_rs_cl(_g1h, &pss); | |
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3891 |
| 342 | 3892 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss); |
| 3893 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss); | |
| 3894 G1ParScanAndMarkHeapRSClosure scan_mark_heap_rs_cl(_g1h, &pss); | |
| 3895 | |
| 3896 OopsInHeapRegionClosure *scan_root_cl; | |
| 3897 OopsInHeapRegionClosure *scan_perm_cl; | |
| 3898 OopsInHeapRegionClosure *scan_so_cl; | |
| 3899 | |
| 3900 if (_g1h->g1_policy()->should_initiate_conc_mark()) { | |
| 3901 scan_root_cl = &scan_mark_root_cl; | |
| 3902 scan_perm_cl = &scan_mark_perm_cl; | |
| 3903 scan_so_cl = &scan_mark_heap_rs_cl; | |
| 3904 } else { | |
| 3905 scan_root_cl = &only_scan_root_cl; | |
| 3906 scan_perm_cl = &only_scan_perm_cl; | |
| 3907 scan_so_cl = &only_scan_heap_rs_cl; | |
| 3908 } | |
| 3909 | |
| 3910 pss.start_strong_roots(); | |
| 3911 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
| 3912 SharedHeap::SO_AllClasses, | |
| 3913 scan_root_cl, | |
| 3914 &only_scan_heap_rs_cl, | |
| 3915 scan_so_cl, | |
| 3916 scan_perm_cl, | |
| 3917 i); | |
| 3918 pss.end_strong_roots(); | |
| 3919 { | |
| 3920 double start = os::elapsedTime(); | |
| 3921 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
| 3922 evac.do_void(); | |
| 3923 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
| 3924 double term_ms = pss.term_time()*1000.0; | |
| 3925 _g1h->g1_policy()->record_obj_copy_time(i, elapsed_ms-term_ms); | |
| 3926 _g1h->g1_policy()->record_termination_time(i, term_ms); | |
| 3927 } | |
| 751 | 3928 if (G1UseSurvivorSpaces) { |
| 545 | 3929 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
| 3930 } | |
| 342 | 3931 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
| 3932 | |
| 3933 // Clean up any par-expanded rem sets. | |
| 3934 HeapRegionRemSet::par_cleanup(); | |
| 3935 | |
| 3936 MutexLocker x(stats_lock()); | |
| 3937 if (ParallelGCVerbose) { | |
| 3938 gclog_or_tty->print("Thread %d complete:\n", i); | |
| 3939 #if G1_DETAILED_STATS | |
| 3940 gclog_or_tty->print(" Pushes: %7d Pops: %7d Overflows: %7d Steals %7d (in %d attempts)\n", | |
| 3941 pss.pushes(), | |
| 3942 pss.pops(), | |
| 3943 pss.overflow_pushes(), | |
| 3944 pss.steals(), | |
| 3945 pss.steal_attempts()); | |
| 3946 #endif | |
| 3947 double elapsed = pss.elapsed(); | |
| 3948 double strong_roots = pss.strong_roots_time(); | |
| 3949 double term = pss.term_time(); | |
| 3950 gclog_or_tty->print(" Elapsed: %7.2f ms.\n" | |
| 3951 " Strong roots: %7.2f ms (%6.2f%%)\n" | |
| 3952 " Termination: %7.2f ms (%6.2f%%) (in %d entries)\n", | |
| 3953 elapsed * 1000.0, | |
| 3954 strong_roots * 1000.0, (strong_roots*100.0/elapsed), | |
| 3955 term * 1000.0, (term*100.0/elapsed), | |
| 3956 pss.term_attempts()); | |
| 3957 size_t total_waste = pss.alloc_buffer_waste() + pss.undo_waste(); | |
| 3958 gclog_or_tty->print(" Waste: %8dK\n" | |
| 3959 " Alloc Buffer: %8dK\n" | |
| 3960 " Undo: %8dK\n", | |
| 3961 (total_waste * HeapWordSize) / K, | |
| 3962 (pss.alloc_buffer_waste() * HeapWordSize) / K, | |
| 3963 (pss.undo_waste() * HeapWordSize) / K); | |
| 3964 } | |
| 3965 | |
| 3966 assert(pss.refs_to_scan() == 0, "Task queue should be empty"); | |
| 3967 assert(pss.overflowed_refs_to_scan() == 0, "Overflow queue should be empty"); | |
| 3968 } | |
| 3969 }; | |
| 3970 | |
| 3971 // *** Common G1 Evacuation Stuff | |
| 3972 | |
| 3973 void | |
| 3974 G1CollectedHeap:: | |
| 3975 g1_process_strong_roots(bool collecting_perm_gen, | |
| 3976 SharedHeap::ScanningOption so, | |
| 3977 OopClosure* scan_non_heap_roots, | |
| 3978 OopsInHeapRegionClosure* scan_rs, | |
| 3979 OopsInHeapRegionClosure* scan_so, | |
| 3980 OopsInGenClosure* scan_perm, | |
| 3981 int worker_i) { | |
| 3982 // First scan the strong roots, including the perm gen. | |
| 3983 double ext_roots_start = os::elapsedTime(); | |
| 3984 double closure_app_time_sec = 0.0; | |
| 3985 | |
| 3986 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
| 3987 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
| 3988 buf_scan_perm.set_generation(perm_gen()); | |
| 3989 | |
| 3990 process_strong_roots(collecting_perm_gen, so, | |
| 3991 &buf_scan_non_heap_roots, | |
| 3992 &buf_scan_perm); | |
| 3993 // Finish up any enqueued closure apps. | |
| 3994 buf_scan_non_heap_roots.done(); | |
| 3995 buf_scan_perm.done(); | |
| 3996 double ext_roots_end = os::elapsedTime(); | |
| 3997 g1_policy()->reset_obj_copy_time(worker_i); | |
| 3998 double obj_copy_time_sec = | |
| 3999 buf_scan_non_heap_roots.closure_app_seconds() + | |
| 4000 buf_scan_perm.closure_app_seconds(); | |
| 4001 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); | |
| 4002 double ext_root_time_ms = | |
| 4003 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
| 4004 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); | |
| 4005 | |
| 4006 // Scan strong roots in mark stack. | |
| 4007 if (!_process_strong_tasks->is_task_claimed(G1H_PS_mark_stack_oops_do)) { | |
| 4008 concurrent_mark()->oops_do(scan_non_heap_roots); | |
| 4009 } | |
| 4010 double mark_stack_scan_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; | |
| 4011 g1_policy()->record_mark_stack_scan_time(worker_i, mark_stack_scan_ms); | |
| 4012 | |
| 4013 // XXX What should this be doing in the parallel case? | |
| 4014 g1_policy()->record_collection_pause_end_CH_strong_roots(); | |
| 4015 if (scan_so != NULL) { | |
| 4016 scan_scan_only_set(scan_so, worker_i); | |
| 4017 } | |
| 4018 // Now scan the complement of the collection set. | |
| 4019 if (scan_rs != NULL) { | |
| 4020 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
| 4021 } | |
| 4022 // Finish with the ref_processor roots. | |
| 4023 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { | |
| 4024 ref_processor()->oops_do(scan_non_heap_roots); | |
| 4025 } | |
| 4026 g1_policy()->record_collection_pause_end_G1_strong_roots(); | |
| 4027 _process_strong_tasks->all_tasks_completed(); | |
| 4028 } | |
| 4029 | |
| 4030 void | |
| 4031 G1CollectedHeap::scan_scan_only_region(HeapRegion* r, | |
| 4032 OopsInHeapRegionClosure* oc, | |
| 4033 int worker_i) { | |
| 4034 HeapWord* startAddr = r->bottom(); | |
| 4035 HeapWord* endAddr = r->used_region().end(); | |
| 4036 | |
| 4037 oc->set_region(r); | |
| 4038 | |
| 4039 HeapWord* p = r->bottom(); | |
| 4040 HeapWord* t = r->top(); | |
| 4041 guarantee( p == r->next_top_at_mark_start(), "invariant" ); | |
| 4042 while (p < t) { | |
| 4043 oop obj = oop(p); | |
| 4044 p += obj->oop_iterate(oc); | |
| 4045 } | |
| 4046 } | |
| 4047 | |
| 4048 void | |
| 4049 G1CollectedHeap::scan_scan_only_set(OopsInHeapRegionClosure* oc, | |
| 4050 int worker_i) { | |
| 4051 double start = os::elapsedTime(); | |
| 4052 | |
| 4053 BufferingOopsInHeapRegionClosure boc(oc); | |
| 4054 | |
| 4055 FilterInHeapRegionAndIntoCSClosure scan_only(this, &boc); | |
| 4056 FilterAndMarkInHeapRegionAndIntoCSClosure scan_and_mark(this, &boc, concurrent_mark()); | |
| 4057 | |
| 4058 OopsInHeapRegionClosure *foc; | |
| 4059 if (g1_policy()->should_initiate_conc_mark()) | |
| 4060 foc = &scan_and_mark; | |
| 4061 else | |
| 4062 foc = &scan_only; | |
| 4063 | |
| 4064 HeapRegion* hr; | |
| 4065 int n = 0; | |
| 4066 while ((hr = _young_list->par_get_next_scan_only_region()) != NULL) { | |
| 4067 scan_scan_only_region(hr, foc, worker_i); | |
| 4068 ++n; | |
| 4069 } | |
| 4070 boc.done(); | |
| 4071 | |
| 4072 double closure_app_s = boc.closure_app_seconds(); | |
| 4073 g1_policy()->record_obj_copy_time(worker_i, closure_app_s * 1000.0); | |
| 4074 double ms = (os::elapsedTime() - start - closure_app_s)*1000.0; | |
| 4075 g1_policy()->record_scan_only_time(worker_i, ms, n); | |
| 4076 } | |
| 4077 | |
| 4078 void | |
| 4079 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
| 4080 OopClosure* non_root_closure) { | |
| 4081 SharedHeap::process_weak_roots(root_closure, non_root_closure); | |
| 4082 } | |
| 4083 | |
| 4084 | |
| 4085 class SaveMarksClosure: public HeapRegionClosure { | |
| 4086 public: | |
| 4087 bool doHeapRegion(HeapRegion* r) { | |
| 4088 r->save_marks(); | |
| 4089 return false; | |
| 4090 } | |
| 4091 }; | |
| 4092 | |
| 4093 void G1CollectedHeap::save_marks() { | |
| 4094 if (ParallelGCThreads == 0) { | |
| 4095 SaveMarksClosure sm; | |
| 4096 heap_region_iterate(&sm); | |
| 4097 } | |
| 4098 // We do this even in the parallel case | |
| 4099 perm_gen()->save_marks(); | |
| 4100 } | |
| 4101 | |
| 4102 void G1CollectedHeap::evacuate_collection_set() { | |
| 4103 set_evacuation_failed(false); | |
| 4104 | |
| 4105 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
| 4106 concurrent_g1_refine()->set_use_cache(false); | |
| 889 | 4107 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
| 4108 | |
| 342 | 4109 int n_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); |
| 4110 set_par_threads(n_workers); | |
| 4111 G1ParTask g1_par_task(this, n_workers, _task_queues); | |
| 4112 | |
| 4113 init_for_evac_failure(NULL); | |
| 4114 | |
| 4115 change_strong_roots_parity(); // In preparation for parallel strong roots. | |
| 4116 rem_set()->prepare_for_younger_refs_iterate(true); | |
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4118 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
| 342 | 4119 double start_par = os::elapsedTime(); |
| 4120 if (ParallelGCThreads > 0) { | |
| 4121 // The individual threads will set their evac-failure closures. | |
| 4122 workers()->run_task(&g1_par_task); | |
| 4123 } else { | |
| 4124 g1_par_task.work(0); | |
| 4125 } | |
| 4126 | |
| 4127 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
| 4128 g1_policy()->record_par_time(par_time); | |
| 4129 set_par_threads(0); | |
| 4130 // Is this the right thing to do here? We don't save marks | |
| 4131 // on individual heap regions when we allocate from | |
| 4132 // them in parallel, so this seems like the correct place for this. | |
| 545 | 4133 retire_all_alloc_regions(); |
| 342 | 4134 { |
| 4135 G1IsAliveClosure is_alive(this); | |
| 4136 G1KeepAliveClosure keep_alive(this); | |
| 4137 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
| 4138 } | |
|
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4139 release_gc_alloc_regions(false /* totally */); |
| 342 | 4140 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); |
|
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4141 |
| 889 | 4142 concurrent_g1_refine()->clear_hot_cache(); |
| 342 | 4143 concurrent_g1_refine()->set_use_cache(true); |
| 4144 | |
| 4145 finalize_for_evac_failure(); | |
| 4146 | |
| 4147 // Must do this before removing self-forwarding pointers, which clears | |
| 4148 // the per-region evac-failure flags. | |
| 4149 concurrent_mark()->complete_marking_in_collection_set(); | |
| 4150 | |
| 4151 if (evacuation_failed()) { | |
| 4152 remove_self_forwarding_pointers(); | |
| 4153 if (PrintGCDetails) { | |
| 4154 gclog_or_tty->print(" (evacuation failed)"); | |
| 4155 } else if (PrintGC) { | |
| 4156 gclog_or_tty->print("--"); | |
| 4157 } | |
| 4158 } | |
| 4159 | |
|
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4160 if (G1DeferredRSUpdate) { |
|
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4161 RedirtyLoggedCardTableEntryFastClosure redirty; |
|
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4162 dirty_card_queue_set().set_closure(&redirty); |
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4163 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
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4164 JavaThread::dirty_card_queue_set().merge_bufferlists(&dirty_card_queue_set()); |
|
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4165 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
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4166 } |
|
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|
4167 |
| 342 | 4168 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
| 4169 } | |
| 4170 | |
| 4171 void G1CollectedHeap::free_region(HeapRegion* hr) { | |
| 4172 size_t pre_used = 0; | |
| 4173 size_t cleared_h_regions = 0; | |
| 4174 size_t freed_regions = 0; | |
| 4175 UncleanRegionList local_list; | |
| 4176 | |
| 4177 HeapWord* start = hr->bottom(); | |
| 4178 HeapWord* end = hr->prev_top_at_mark_start(); | |
| 4179 size_t used_bytes = hr->used(); | |
| 4180 size_t live_bytes = hr->max_live_bytes(); | |
| 4181 if (used_bytes > 0) { | |
| 4182 guarantee( live_bytes <= used_bytes, "invariant" ); | |
| 4183 } else { | |
| 4184 guarantee( live_bytes == 0, "invariant" ); | |
| 4185 } | |
| 4186 | |
| 4187 size_t garbage_bytes = used_bytes - live_bytes; | |
| 4188 if (garbage_bytes > 0) | |
| 4189 g1_policy()->decrease_known_garbage_bytes(garbage_bytes); | |
| 4190 | |
| 4191 free_region_work(hr, pre_used, cleared_h_regions, freed_regions, | |
| 4192 &local_list); | |
| 4193 finish_free_region_work(pre_used, cleared_h_regions, freed_regions, | |
| 4194 &local_list); | |
| 4195 } | |
| 4196 | |
| 4197 void | |
| 4198 G1CollectedHeap::free_region_work(HeapRegion* hr, | |
| 4199 size_t& pre_used, | |
| 4200 size_t& cleared_h_regions, | |
| 4201 size_t& freed_regions, | |
| 4202 UncleanRegionList* list, | |
| 4203 bool par) { | |
| 4204 pre_used += hr->used(); | |
| 4205 if (hr->isHumongous()) { | |
| 4206 assert(hr->startsHumongous(), | |
| 4207 "Only the start of a humongous region should be freed."); | |
| 4208 int ind = _hrs->find(hr); | |
| 4209 assert(ind != -1, "Should have an index."); | |
| 4210 // Clear the start region. | |
| 4211 hr->hr_clear(par, true /*clear_space*/); | |
| 4212 list->insert_before_head(hr); | |
| 4213 cleared_h_regions++; | |
| 4214 freed_regions++; | |
| 4215 // Clear any continued regions. | |
| 4216 ind++; | |
| 4217 while ((size_t)ind < n_regions()) { | |
| 4218 HeapRegion* hrc = _hrs->at(ind); | |
| 4219 if (!hrc->continuesHumongous()) break; | |
| 4220 // Otherwise, does continue the H region. | |
| 4221 assert(hrc->humongous_start_region() == hr, "Huh?"); | |
| 4222 hrc->hr_clear(par, true /*clear_space*/); | |
| 4223 cleared_h_regions++; | |
| 4224 freed_regions++; | |
| 4225 list->insert_before_head(hrc); | |
| 4226 ind++; | |
| 4227 } | |
| 4228 } else { | |
| 4229 hr->hr_clear(par, true /*clear_space*/); | |
| 4230 list->insert_before_head(hr); | |
| 4231 freed_regions++; | |
| 4232 // If we're using clear2, this should not be enabled. | |
| 4233 // assert(!hr->in_cohort(), "Can't be both free and in a cohort."); | |
| 4234 } | |
| 4235 } | |
| 4236 | |
| 4237 void G1CollectedHeap::finish_free_region_work(size_t pre_used, | |
| 4238 size_t cleared_h_regions, | |
| 4239 size_t freed_regions, | |
| 4240 UncleanRegionList* list) { | |
| 4241 if (list != NULL && list->sz() > 0) { | |
| 4242 prepend_region_list_on_unclean_list(list); | |
| 4243 } | |
| 4244 // Acquire a lock, if we're parallel, to update possibly-shared | |
| 4245 // variables. | |
| 4246 Mutex* lock = (n_par_threads() > 0) ? ParGCRareEvent_lock : NULL; | |
| 4247 { | |
| 4248 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); | |
| 4249 _summary_bytes_used -= pre_used; | |
| 4250 _num_humongous_regions -= (int) cleared_h_regions; | |
| 4251 _free_regions += freed_regions; | |
| 4252 } | |
| 4253 } | |
| 4254 | |
| 4255 | |
| 4256 void G1CollectedHeap::dirtyCardsForYoungRegions(CardTableModRefBS* ct_bs, HeapRegion* list) { | |
| 4257 while (list != NULL) { | |
| 4258 guarantee( list->is_young(), "invariant" ); | |
| 4259 | |
| 4260 HeapWord* bottom = list->bottom(); | |
| 4261 HeapWord* end = list->end(); | |
| 4262 MemRegion mr(bottom, end); | |
| 4263 ct_bs->dirty(mr); | |
| 4264 | |
| 4265 list = list->get_next_young_region(); | |
| 4266 } | |
| 4267 } | |
| 4268 | |
|
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4269 |
|
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|
4270 class G1ParCleanupCTTask : public AbstractGangTask { |
|
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|
4271 CardTableModRefBS* _ct_bs; |
|
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4272 G1CollectedHeap* _g1h; |
|
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|
4273 HeapRegion* volatile _so_head; |
|
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4274 HeapRegion* volatile _su_head; |
|
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|
4275 public: |
|
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|
4276 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
|
940
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|
4277 G1CollectedHeap* g1h, |
|
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|
4278 HeapRegion* scan_only_list, |
|
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4279 HeapRegion* survivor_list) : |
|
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4280 AbstractGangTask("G1 Par Cleanup CT Task"), |
|
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4281 _ct_bs(ct_bs), |
|
940
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4282 _g1h(g1h), |
|
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|
4283 _so_head(scan_only_list), |
|
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|
4284 _su_head(survivor_list) |
|
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|
4285 { } |
|
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|
4286 |
|
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|
4287 void work(int i) { |
|
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|
4288 HeapRegion* r; |
|
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|
4289 while (r = _g1h->pop_dirty_cards_region()) { |
|
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|
4290 clear_cards(r); |
|
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|
4291 } |
|
940
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|
4292 // Redirty the cards of the scan-only and survivor regions. |
|
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|
4293 dirty_list(&this->_so_head); |
|
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|
4294 dirty_list(&this->_su_head); |
|
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|
4295 } |
|
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|
4296 |
|
796
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|
4297 void clear_cards(HeapRegion* r) { |
|
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4298 // Cards for Survivor and Scan-Only regions will be dirtied later. |
|
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|
4299 if (!r->is_scan_only() && !r->is_survivor()) { |
|
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4300 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
|
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|
4301 } |
|
29e7d79232b9
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|
4302 } |
|
940
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|
4303 |
|
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|
4304 void dirty_list(HeapRegion* volatile * head_ptr) { |
|
8624da129f0b
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|
4305 HeapRegion* head; |
|
8624da129f0b
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|
4306 do { |
|
8624da129f0b
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|
4307 // Pop region off the list. |
|
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|
4308 head = *head_ptr; |
|
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|
4309 if (head != NULL) { |
|
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|
4310 HeapRegion* r = (HeapRegion*) |
|
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|
4311 Atomic::cmpxchg_ptr(head->get_next_young_region(), head_ptr, head); |
|
8624da129f0b
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|
4312 if (r == head) { |
|
8624da129f0b
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|
4313 assert(!r->isHumongous(), "Humongous regions shouldn't be on survivor list"); |
|
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|
4314 _ct_bs->dirty(MemRegion(r->bottom(), r->end())); |
|
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|
4315 } |
|
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|
4316 } |
|
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|
4317 } while (*head_ptr != NULL); |
|
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|
4318 } |
|
796
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|
4319 }; |
|
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|
4320 |
|
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|
4321 |
|
940
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|
4322 #ifndef PRODUCT |
|
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|
4323 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
|
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|
4324 CardTableModRefBS* _ct_bs; |
|
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|
4325 public: |
|
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|
4326 G1VerifyCardTableCleanup(CardTableModRefBS* ct_bs) |
|
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|
4327 : _ct_bs(ct_bs) |
|
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|
4328 { } |
|
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|
4329 virtual bool doHeapRegion(HeapRegion* r) |
|
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|
4330 { |
|
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|
4331 MemRegion mr(r->bottom(), r->end()); |
|
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4332 if (r->is_scan_only() || r->is_survivor()) { |
|
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|
4333 _ct_bs->verify_dirty_region(mr); |
|
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|
4334 } else { |
|
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|
4335 _ct_bs->verify_clean_region(mr); |
|
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|
4336 } |
|
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|
4337 return false; |
|
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|
4338 } |
|
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|
4339 }; |
|
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|
4340 #endif |
|
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|
4341 |
| 342 | 4342 void G1CollectedHeap::cleanUpCardTable() { |
| 4343 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
| 4344 double start = os::elapsedTime(); | |
| 4345 | |
|
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|
4346 // Iterate over the dirty cards region list. |
|
940
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|
4347 G1ParCleanupCTTask cleanup_task(ct_bs, this, |
|
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|
4348 _young_list->first_scan_only_region(), |
|
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|
4349 _young_list->first_survivor_region()); |
|
796
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|
4350 if (ParallelGCThreads > 0) { |
|
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|
4351 set_par_threads(workers()->total_workers()); |
|
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4352 workers()->run_task(&cleanup_task); |
|
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4353 set_par_threads(0); |
|
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4354 } else { |
|
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4355 while (_dirty_cards_region_list) { |
|
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4356 HeapRegion* r = _dirty_cards_region_list; |
|
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4357 cleanup_task.clear_cards(r); |
|
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4358 _dirty_cards_region_list = r->get_next_dirty_cards_region(); |
|
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4359 if (_dirty_cards_region_list == r) { |
|
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4360 // The last region. |
|
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4361 _dirty_cards_region_list = NULL; |
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4362 } |
|
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4363 r->set_next_dirty_cards_region(NULL); |
|
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|
4364 } |
|
940
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|
4365 // now, redirty the cards of the scan-only and survivor regions |
|
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4366 // (it seemed faster to do it this way, instead of iterating over |
|
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4367 // all regions and then clearing / dirtying as appropriate) |
|
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4368 dirtyCardsForYoungRegions(ct_bs, _young_list->first_scan_only_region()); |
|
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4369 dirtyCardsForYoungRegions(ct_bs, _young_list->first_survivor_region()); |
|
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4370 } |
| 342 | 4371 double elapsed = os::elapsedTime() - start; |
| 4372 g1_policy()->record_clear_ct_time( elapsed * 1000.0); | |
|
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4373 #ifndef PRODUCT |
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4374 if (G1VerifyCTCleanup || VerifyAfterGC) { |
|
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|
4375 G1VerifyCardTableCleanup cleanup_verifier(ct_bs); |
|
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4376 heap_region_iterate(&cleanup_verifier); |
|
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4377 } |
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|
4378 #endif |
| 342 | 4379 } |
| 4380 | |
| 4381 void G1CollectedHeap::do_collection_pause_if_appropriate(size_t word_size) { | |
| 4382 if (g1_policy()->should_do_collection_pause(word_size)) { | |
| 4383 do_collection_pause(); | |
| 4384 } | |
| 4385 } | |
| 4386 | |
| 4387 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
| 4388 double young_time_ms = 0.0; | |
| 4389 double non_young_time_ms = 0.0; | |
| 4390 | |
| 4391 G1CollectorPolicy* policy = g1_policy(); | |
| 4392 | |
| 4393 double start_sec = os::elapsedTime(); | |
| 4394 bool non_young = true; | |
| 4395 | |
| 4396 HeapRegion* cur = cs_head; | |
| 4397 int age_bound = -1; | |
| 4398 size_t rs_lengths = 0; | |
| 4399 | |
| 4400 while (cur != NULL) { | |
| 4401 if (non_young) { | |
| 4402 if (cur->is_young()) { | |
| 4403 double end_sec = os::elapsedTime(); | |
| 4404 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 4405 non_young_time_ms += elapsed_ms; | |
| 4406 | |
| 4407 start_sec = os::elapsedTime(); | |
| 4408 non_young = false; | |
| 4409 } | |
| 4410 } else { | |
| 4411 if (!cur->is_on_free_list()) { | |
| 4412 double end_sec = os::elapsedTime(); | |
| 4413 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 4414 young_time_ms += elapsed_ms; | |
| 4415 | |
| 4416 start_sec = os::elapsedTime(); | |
| 4417 non_young = true; | |
| 4418 } | |
| 4419 } | |
| 4420 | |
| 4421 rs_lengths += cur->rem_set()->occupied(); | |
| 4422 | |
| 4423 HeapRegion* next = cur->next_in_collection_set(); | |
| 4424 assert(cur->in_collection_set(), "bad CS"); | |
| 4425 cur->set_next_in_collection_set(NULL); | |
| 4426 cur->set_in_collection_set(false); | |
| 4427 | |
| 4428 if (cur->is_young()) { | |
| 4429 int index = cur->young_index_in_cset(); | |
| 4430 guarantee( index != -1, "invariant" ); | |
| 4431 guarantee( (size_t)index < policy->young_cset_length(), "invariant" ); | |
| 4432 size_t words_survived = _surviving_young_words[index]; | |
| 4433 cur->record_surv_words_in_group(words_survived); | |
| 4434 } else { | |
| 4435 int index = cur->young_index_in_cset(); | |
| 4436 guarantee( index == -1, "invariant" ); | |
| 4437 } | |
| 4438 | |
| 4439 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
| 4440 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
| 4441 "invariant" ); | |
| 4442 | |
| 4443 if (!cur->evacuation_failed()) { | |
| 4444 // And the region is empty. | |
| 4445 assert(!cur->is_empty(), | |
| 4446 "Should not have empty regions in a CS."); | |
| 4447 free_region(cur); | |
| 4448 } else { | |
| 4449 guarantee( !cur->is_scan_only(), "should not be scan only" ); | |
| 4450 cur->uninstall_surv_rate_group(); | |
| 4451 if (cur->is_young()) | |
| 4452 cur->set_young_index_in_cset(-1); | |
| 4453 cur->set_not_young(); | |
| 4454 cur->set_evacuation_failed(false); | |
| 4455 } | |
| 4456 cur = next; | |
| 4457 } | |
| 4458 | |
| 4459 policy->record_max_rs_lengths(rs_lengths); | |
| 4460 policy->cset_regions_freed(); | |
| 4461 | |
| 4462 double end_sec = os::elapsedTime(); | |
| 4463 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 4464 if (non_young) | |
| 4465 non_young_time_ms += elapsed_ms; | |
| 4466 else | |
| 4467 young_time_ms += elapsed_ms; | |
| 4468 | |
| 4469 policy->record_young_free_cset_time_ms(young_time_ms); | |
| 4470 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
| 4471 } | |
| 4472 | |
| 4473 HeapRegion* | |
| 4474 G1CollectedHeap::alloc_region_from_unclean_list_locked(bool zero_filled) { | |
| 4475 assert(ZF_mon->owned_by_self(), "Precondition"); | |
| 4476 HeapRegion* res = pop_unclean_region_list_locked(); | |
| 4477 if (res != NULL) { | |
| 4478 assert(!res->continuesHumongous() && | |
| 4479 res->zero_fill_state() != HeapRegion::Allocated, | |
| 4480 "Only free regions on unclean list."); | |
| 4481 if (zero_filled) { | |
| 4482 res->ensure_zero_filled_locked(); | |
| 4483 res->set_zero_fill_allocated(); | |
| 4484 } | |
| 4485 } | |
| 4486 return res; | |
| 4487 } | |
| 4488 | |
| 4489 HeapRegion* G1CollectedHeap::alloc_region_from_unclean_list(bool zero_filled) { | |
| 4490 MutexLockerEx zx(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4491 return alloc_region_from_unclean_list_locked(zero_filled); | |
| 4492 } | |
| 4493 | |
| 4494 void G1CollectedHeap::put_region_on_unclean_list(HeapRegion* r) { | |
| 4495 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4496 put_region_on_unclean_list_locked(r); | |
| 4497 if (should_zf()) ZF_mon->notify_all(); // Wake up ZF thread. | |
| 4498 } | |
| 4499 | |
| 4500 void G1CollectedHeap::set_unclean_regions_coming(bool b) { | |
| 4501 MutexLockerEx x(Cleanup_mon); | |
| 4502 set_unclean_regions_coming_locked(b); | |
| 4503 } | |
| 4504 | |
| 4505 void G1CollectedHeap::set_unclean_regions_coming_locked(bool b) { | |
| 4506 assert(Cleanup_mon->owned_by_self(), "Precondition"); | |
| 4507 _unclean_regions_coming = b; | |
| 4508 // Wake up mutator threads that might be waiting for completeCleanup to | |
| 4509 // finish. | |
| 4510 if (!b) Cleanup_mon->notify_all(); | |
| 4511 } | |
| 4512 | |
| 4513 void G1CollectedHeap::wait_for_cleanup_complete() { | |
| 4514 MutexLockerEx x(Cleanup_mon); | |
| 4515 wait_for_cleanup_complete_locked(); | |
| 4516 } | |
| 4517 | |
| 4518 void G1CollectedHeap::wait_for_cleanup_complete_locked() { | |
| 4519 assert(Cleanup_mon->owned_by_self(), "precondition"); | |
| 4520 while (_unclean_regions_coming) { | |
| 4521 Cleanup_mon->wait(); | |
| 4522 } | |
| 4523 } | |
| 4524 | |
| 4525 void | |
| 4526 G1CollectedHeap::put_region_on_unclean_list_locked(HeapRegion* r) { | |
| 4527 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4528 _unclean_region_list.insert_before_head(r); | |
| 4529 } | |
| 4530 | |
| 4531 void | |
| 4532 G1CollectedHeap::prepend_region_list_on_unclean_list(UncleanRegionList* list) { | |
| 4533 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4534 prepend_region_list_on_unclean_list_locked(list); | |
| 4535 if (should_zf()) ZF_mon->notify_all(); // Wake up ZF thread. | |
| 4536 } | |
| 4537 | |
| 4538 void | |
| 4539 G1CollectedHeap:: | |
| 4540 prepend_region_list_on_unclean_list_locked(UncleanRegionList* list) { | |
| 4541 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4542 _unclean_region_list.prepend_list(list); | |
| 4543 } | |
| 4544 | |
| 4545 HeapRegion* G1CollectedHeap::pop_unclean_region_list_locked() { | |
| 4546 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4547 HeapRegion* res = _unclean_region_list.pop(); | |
| 4548 if (res != NULL) { | |
| 4549 // Inform ZF thread that there's a new unclean head. | |
| 4550 if (_unclean_region_list.hd() != NULL && should_zf()) | |
| 4551 ZF_mon->notify_all(); | |
| 4552 } | |
| 4553 return res; | |
| 4554 } | |
| 4555 | |
| 4556 HeapRegion* G1CollectedHeap::peek_unclean_region_list_locked() { | |
| 4557 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4558 return _unclean_region_list.hd(); | |
| 4559 } | |
| 4560 | |
| 4561 | |
| 4562 bool G1CollectedHeap::move_cleaned_region_to_free_list_locked() { | |
| 4563 assert(ZF_mon->owned_by_self(), "Precondition"); | |
| 4564 HeapRegion* r = peek_unclean_region_list_locked(); | |
| 4565 if (r != NULL && r->zero_fill_state() == HeapRegion::ZeroFilled) { | |
| 4566 // Result of below must be equal to "r", since we hold the lock. | |
| 4567 (void)pop_unclean_region_list_locked(); | |
| 4568 put_free_region_on_list_locked(r); | |
| 4569 return true; | |
| 4570 } else { | |
| 4571 return false; | |
| 4572 } | |
| 4573 } | |
| 4574 | |
| 4575 bool G1CollectedHeap::move_cleaned_region_to_free_list() { | |
| 4576 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4577 return move_cleaned_region_to_free_list_locked(); | |
| 4578 } | |
| 4579 | |
| 4580 | |
| 4581 void G1CollectedHeap::put_free_region_on_list_locked(HeapRegion* r) { | |
| 4582 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4583 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4584 assert(r->zero_fill_state() == HeapRegion::ZeroFilled, | |
| 4585 "Regions on free list must be zero filled"); | |
| 4586 assert(!r->isHumongous(), "Must not be humongous."); | |
| 4587 assert(r->is_empty(), "Better be empty"); | |
| 4588 assert(!r->is_on_free_list(), | |
| 4589 "Better not already be on free list"); | |
| 4590 assert(!r->is_on_unclean_list(), | |
| 4591 "Better not already be on unclean list"); | |
| 4592 r->set_on_free_list(true); | |
| 4593 r->set_next_on_free_list(_free_region_list); | |
| 4594 _free_region_list = r; | |
| 4595 _free_region_list_size++; | |
| 4596 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4597 } | |
| 4598 | |
| 4599 void G1CollectedHeap::put_free_region_on_list(HeapRegion* r) { | |
| 4600 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4601 put_free_region_on_list_locked(r); | |
| 4602 } | |
| 4603 | |
| 4604 HeapRegion* G1CollectedHeap::pop_free_region_list_locked() { | |
| 4605 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4606 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4607 HeapRegion* res = _free_region_list; | |
| 4608 if (res != NULL) { | |
| 4609 _free_region_list = res->next_from_free_list(); | |
| 4610 _free_region_list_size--; | |
| 4611 res->set_on_free_list(false); | |
| 4612 res->set_next_on_free_list(NULL); | |
| 4613 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4614 } | |
| 4615 return res; | |
| 4616 } | |
| 4617 | |
| 4618 | |
| 4619 HeapRegion* G1CollectedHeap::alloc_free_region_from_lists(bool zero_filled) { | |
| 4620 // By self, or on behalf of self. | |
| 4621 assert(Heap_lock->is_locked(), "Precondition"); | |
| 4622 HeapRegion* res = NULL; | |
| 4623 bool first = true; | |
| 4624 while (res == NULL) { | |
| 4625 if (zero_filled || !first) { | |
| 4626 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4627 res = pop_free_region_list_locked(); | |
| 4628 if (res != NULL) { | |
| 4629 assert(!res->zero_fill_is_allocated(), | |
| 4630 "No allocated regions on free list."); | |
| 4631 res->set_zero_fill_allocated(); | |
| 4632 } else if (!first) { | |
| 4633 break; // We tried both, time to return NULL. | |
| 4634 } | |
| 4635 } | |
| 4636 | |
| 4637 if (res == NULL) { | |
| 4638 res = alloc_region_from_unclean_list(zero_filled); | |
| 4639 } | |
| 4640 assert(res == NULL || | |
| 4641 !zero_filled || | |
| 4642 res->zero_fill_is_allocated(), | |
| 4643 "We must have allocated the region we're returning"); | |
| 4644 first = false; | |
| 4645 } | |
| 4646 return res; | |
| 4647 } | |
| 4648 | |
| 4649 void G1CollectedHeap::remove_allocated_regions_from_lists() { | |
| 4650 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4651 { | |
| 4652 HeapRegion* prev = NULL; | |
| 4653 HeapRegion* cur = _unclean_region_list.hd(); | |
| 4654 while (cur != NULL) { | |
| 4655 HeapRegion* next = cur->next_from_unclean_list(); | |
| 4656 if (cur->zero_fill_is_allocated()) { | |
| 4657 // Remove from the list. | |
| 4658 if (prev == NULL) { | |
| 4659 (void)_unclean_region_list.pop(); | |
| 4660 } else { | |
| 4661 _unclean_region_list.delete_after(prev); | |
| 4662 } | |
| 4663 cur->set_on_unclean_list(false); | |
| 4664 cur->set_next_on_unclean_list(NULL); | |
| 4665 } else { | |
| 4666 prev = cur; | |
| 4667 } | |
| 4668 cur = next; | |
| 4669 } | |
| 4670 assert(_unclean_region_list.sz() == unclean_region_list_length(), | |
| 4671 "Inv"); | |
| 4672 } | |
| 4673 | |
| 4674 { | |
| 4675 HeapRegion* prev = NULL; | |
| 4676 HeapRegion* cur = _free_region_list; | |
| 4677 while (cur != NULL) { | |
| 4678 HeapRegion* next = cur->next_from_free_list(); | |
| 4679 if (cur->zero_fill_is_allocated()) { | |
| 4680 // Remove from the list. | |
| 4681 if (prev == NULL) { | |
| 4682 _free_region_list = cur->next_from_free_list(); | |
| 4683 } else { | |
| 4684 prev->set_next_on_free_list(cur->next_from_free_list()); | |
| 4685 } | |
| 4686 cur->set_on_free_list(false); | |
| 4687 cur->set_next_on_free_list(NULL); | |
| 4688 _free_region_list_size--; | |
| 4689 } else { | |
| 4690 prev = cur; | |
| 4691 } | |
| 4692 cur = next; | |
| 4693 } | |
| 4694 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4695 } | |
| 4696 } | |
| 4697 | |
| 4698 bool G1CollectedHeap::verify_region_lists() { | |
| 4699 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4700 return verify_region_lists_locked(); | |
| 4701 } | |
| 4702 | |
| 4703 bool G1CollectedHeap::verify_region_lists_locked() { | |
| 4704 HeapRegion* unclean = _unclean_region_list.hd(); | |
| 4705 while (unclean != NULL) { | |
| 4706 guarantee(unclean->is_on_unclean_list(), "Well, it is!"); | |
| 4707 guarantee(!unclean->is_on_free_list(), "Well, it shouldn't be!"); | |
| 4708 guarantee(unclean->zero_fill_state() != HeapRegion::Allocated, | |
| 4709 "Everything else is possible."); | |
| 4710 unclean = unclean->next_from_unclean_list(); | |
| 4711 } | |
| 4712 guarantee(_unclean_region_list.sz() == unclean_region_list_length(), "Inv"); | |
| 4713 | |
| 4714 HeapRegion* free_r = _free_region_list; | |
| 4715 while (free_r != NULL) { | |
| 4716 assert(free_r->is_on_free_list(), "Well, it is!"); | |
| 4717 assert(!free_r->is_on_unclean_list(), "Well, it shouldn't be!"); | |
| 4718 switch (free_r->zero_fill_state()) { | |
| 4719 case HeapRegion::NotZeroFilled: | |
| 4720 case HeapRegion::ZeroFilling: | |
| 4721 guarantee(false, "Should not be on free list."); | |
| 4722 break; | |
| 4723 default: | |
| 4724 // Everything else is possible. | |
| 4725 break; | |
| 4726 } | |
| 4727 free_r = free_r->next_from_free_list(); | |
| 4728 } | |
| 4729 guarantee(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4730 // If we didn't do an assertion... | |
| 4731 return true; | |
| 4732 } | |
| 4733 | |
| 4734 size_t G1CollectedHeap::free_region_list_length() { | |
| 4735 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4736 size_t len = 0; | |
| 4737 HeapRegion* cur = _free_region_list; | |
| 4738 while (cur != NULL) { | |
| 4739 len++; | |
| 4740 cur = cur->next_from_free_list(); | |
| 4741 } | |
| 4742 return len; | |
| 4743 } | |
| 4744 | |
| 4745 size_t G1CollectedHeap::unclean_region_list_length() { | |
| 4746 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4747 return _unclean_region_list.length(); | |
| 4748 } | |
| 4749 | |
| 4750 size_t G1CollectedHeap::n_regions() { | |
| 4751 return _hrs->length(); | |
| 4752 } | |
| 4753 | |
| 4754 size_t G1CollectedHeap::max_regions() { | |
| 4755 return | |
| 4756 (size_t)align_size_up(g1_reserved_obj_bytes(), HeapRegion::GrainBytes) / | |
| 4757 HeapRegion::GrainBytes; | |
| 4758 } | |
| 4759 | |
| 4760 size_t G1CollectedHeap::free_regions() { | |
| 4761 /* Possibly-expensive assert. | |
| 4762 assert(_free_regions == count_free_regions(), | |
| 4763 "_free_regions is off."); | |
| 4764 */ | |
| 4765 return _free_regions; | |
| 4766 } | |
| 4767 | |
| 4768 bool G1CollectedHeap::should_zf() { | |
| 4769 return _free_region_list_size < (size_t) G1ConcZFMaxRegions; | |
| 4770 } | |
| 4771 | |
| 4772 class RegionCounter: public HeapRegionClosure { | |
| 4773 size_t _n; | |
| 4774 public: | |
| 4775 RegionCounter() : _n(0) {} | |
| 4776 bool doHeapRegion(HeapRegion* r) { | |
| 677 | 4777 if (r->is_empty()) { |
| 342 | 4778 assert(!r->isHumongous(), "H regions should not be empty."); |
| 4779 _n++; | |
| 4780 } | |
| 4781 return false; | |
| 4782 } | |
| 4783 int res() { return (int) _n; } | |
| 4784 }; | |
| 4785 | |
| 4786 size_t G1CollectedHeap::count_free_regions() { | |
| 4787 RegionCounter rc; | |
| 4788 heap_region_iterate(&rc); | |
| 4789 size_t n = rc.res(); | |
| 4790 if (_cur_alloc_region != NULL && _cur_alloc_region->is_empty()) | |
| 4791 n--; | |
| 4792 return n; | |
| 4793 } | |
| 4794 | |
| 4795 size_t G1CollectedHeap::count_free_regions_list() { | |
| 4796 size_t n = 0; | |
| 4797 size_t o = 0; | |
| 4798 ZF_mon->lock_without_safepoint_check(); | |
| 4799 HeapRegion* cur = _free_region_list; | |
| 4800 while (cur != NULL) { | |
| 4801 cur = cur->next_from_free_list(); | |
| 4802 n++; | |
| 4803 } | |
| 4804 size_t m = unclean_region_list_length(); | |
| 4805 ZF_mon->unlock(); | |
| 4806 return n + m; | |
| 4807 } | |
| 4808 | |
| 4809 bool G1CollectedHeap::should_set_young_locked() { | |
| 4810 assert(heap_lock_held_for_gc(), | |
| 4811 "the heap lock should already be held by or for this thread"); | |
| 4812 return (g1_policy()->in_young_gc_mode() && | |
| 4813 g1_policy()->should_add_next_region_to_young_list()); | |
| 4814 } | |
| 4815 | |
| 4816 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
| 4817 assert(heap_lock_held_for_gc(), | |
| 4818 "the heap lock should already be held by or for this thread"); | |
| 4819 _young_list->push_region(hr); | |
| 4820 g1_policy()->set_region_short_lived(hr); | |
| 4821 } | |
| 4822 | |
| 4823 class NoYoungRegionsClosure: public HeapRegionClosure { | |
| 4824 private: | |
| 4825 bool _success; | |
| 4826 public: | |
| 4827 NoYoungRegionsClosure() : _success(true) { } | |
| 4828 bool doHeapRegion(HeapRegion* r) { | |
| 4829 if (r->is_young()) { | |
| 4830 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
| 4831 r->bottom(), r->end()); | |
| 4832 _success = false; | |
| 4833 } | |
| 4834 return false; | |
| 4835 } | |
| 4836 bool success() { return _success; } | |
| 4837 }; | |
| 4838 | |
| 4839 bool G1CollectedHeap::check_young_list_empty(bool ignore_scan_only_list, | |
| 4840 bool check_sample) { | |
| 4841 bool ret = true; | |
| 4842 | |
| 4843 ret = _young_list->check_list_empty(ignore_scan_only_list, check_sample); | |
| 4844 if (!ignore_scan_only_list) { | |
| 4845 NoYoungRegionsClosure closure; | |
| 4846 heap_region_iterate(&closure); | |
| 4847 ret = ret && closure.success(); | |
| 4848 } | |
| 4849 | |
| 4850 return ret; | |
| 4851 } | |
| 4852 | |
| 4853 void G1CollectedHeap::empty_young_list() { | |
| 4854 assert(heap_lock_held_for_gc(), | |
| 4855 "the heap lock should already be held by or for this thread"); | |
| 4856 assert(g1_policy()->in_young_gc_mode(), "should be in young GC mode"); | |
| 4857 | |
| 4858 _young_list->empty_list(); | |
| 4859 } | |
| 4860 | |
| 4861 bool G1CollectedHeap::all_alloc_regions_no_allocs_since_save_marks() { | |
| 4862 bool no_allocs = true; | |
| 4863 for (int ap = 0; ap < GCAllocPurposeCount && no_allocs; ++ap) { | |
| 4864 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 4865 no_allocs = r == NULL || r->saved_mark_at_top(); | |
| 4866 } | |
| 4867 return no_allocs; | |
| 4868 } | |
| 4869 | |
| 545 | 4870 void G1CollectedHeap::retire_all_alloc_regions() { |
| 342 | 4871 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
| 4872 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 4873 if (r != NULL) { | |
| 4874 // Check for aliases. | |
| 4875 bool has_processed_alias = false; | |
| 4876 for (int i = 0; i < ap; ++i) { | |
| 4877 if (_gc_alloc_regions[i] == r) { | |
| 4878 has_processed_alias = true; | |
| 4879 break; | |
| 4880 } | |
| 4881 } | |
| 4882 if (!has_processed_alias) { | |
| 545 | 4883 retire_alloc_region(r, false /* par */); |
| 342 | 4884 } |
| 4885 } | |
| 4886 } | |
| 4887 } | |
| 4888 | |
| 4889 | |
| 4890 // Done at the start of full GC. | |
| 4891 void G1CollectedHeap::tear_down_region_lists() { | |
| 4892 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4893 while (pop_unclean_region_list_locked() != NULL) ; | |
| 4894 assert(_unclean_region_list.hd() == NULL && _unclean_region_list.sz() == 0, | |
| 4895 "Postconditions of loop.") | |
| 4896 while (pop_free_region_list_locked() != NULL) ; | |
| 4897 assert(_free_region_list == NULL, "Postcondition of loop."); | |
| 4898 if (_free_region_list_size != 0) { | |
| 4899 gclog_or_tty->print_cr("Size is %d.", _free_region_list_size); | |
|
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|
4900 print_on(gclog_or_tty, true /* extended */); |
| 342 | 4901 } |
| 4902 assert(_free_region_list_size == 0, "Postconditions of loop."); | |
| 4903 } | |
| 4904 | |
| 4905 | |
| 4906 class RegionResetter: public HeapRegionClosure { | |
| 4907 G1CollectedHeap* _g1; | |
| 4908 int _n; | |
| 4909 public: | |
| 4910 RegionResetter() : _g1(G1CollectedHeap::heap()), _n(0) {} | |
| 4911 bool doHeapRegion(HeapRegion* r) { | |
| 4912 if (r->continuesHumongous()) return false; | |
| 4913 if (r->top() > r->bottom()) { | |
| 4914 if (r->top() < r->end()) { | |
| 4915 Copy::fill_to_words(r->top(), | |
| 4916 pointer_delta(r->end(), r->top())); | |
| 4917 } | |
| 4918 r->set_zero_fill_allocated(); | |
| 4919 } else { | |
| 4920 assert(r->is_empty(), "tautology"); | |
| 677 | 4921 _n++; |
| 4922 switch (r->zero_fill_state()) { | |
| 342 | 4923 case HeapRegion::NotZeroFilled: |
| 4924 case HeapRegion::ZeroFilling: | |
| 4925 _g1->put_region_on_unclean_list_locked(r); | |
| 4926 break; | |
| 4927 case HeapRegion::Allocated: | |
| 4928 r->set_zero_fill_complete(); | |
| 4929 // no break; go on to put on free list. | |
| 4930 case HeapRegion::ZeroFilled: | |
| 4931 _g1->put_free_region_on_list_locked(r); | |
| 4932 break; | |
| 4933 } | |
| 4934 } | |
| 4935 return false; | |
| 4936 } | |
| 4937 | |
| 4938 int getFreeRegionCount() {return _n;} | |
| 4939 }; | |
| 4940 | |
| 4941 // Done at the end of full GC. | |
| 4942 void G1CollectedHeap::rebuild_region_lists() { | |
| 4943 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4944 // This needs to go at the end of the full GC. | |
| 4945 RegionResetter rs; | |
| 4946 heap_region_iterate(&rs); | |
| 4947 _free_regions = rs.getFreeRegionCount(); | |
| 4948 // Tell the ZF thread it may have work to do. | |
| 4949 if (should_zf()) ZF_mon->notify_all(); | |
| 4950 } | |
| 4951 | |
| 4952 class UsedRegionsNeedZeroFillSetter: public HeapRegionClosure { | |
| 4953 G1CollectedHeap* _g1; | |
| 4954 int _n; | |
| 4955 public: | |
| 4956 UsedRegionsNeedZeroFillSetter() : _g1(G1CollectedHeap::heap()), _n(0) {} | |
| 4957 bool doHeapRegion(HeapRegion* r) { | |
| 4958 if (r->continuesHumongous()) return false; | |
| 4959 if (r->top() > r->bottom()) { | |
| 4960 // There are assertions in "set_zero_fill_needed()" below that | |
| 4961 // require top() == bottom(), so this is technically illegal. | |
| 4962 // We'll skirt the law here, by making that true temporarily. | |
| 4963 DEBUG_ONLY(HeapWord* save_top = r->top(); | |
| 4964 r->set_top(r->bottom())); | |
| 4965 r->set_zero_fill_needed(); | |
| 4966 DEBUG_ONLY(r->set_top(save_top)); | |
| 4967 } | |
| 4968 return false; | |
| 4969 } | |
| 4970 }; | |
| 4971 | |
| 4972 // Done at the start of full GC. | |
| 4973 void G1CollectedHeap::set_used_regions_to_need_zero_fill() { | |
| 4974 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4975 // This needs to go at the end of the full GC. | |
| 4976 UsedRegionsNeedZeroFillSetter rs; | |
| 4977 heap_region_iterate(&rs); | |
| 4978 } | |
| 4979 | |
| 4980 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
| 4981 _refine_cte_cl->set_concurrent(concurrent); | |
| 4982 } | |
| 4983 | |
| 4984 #ifndef PRODUCT | |
| 4985 | |
| 4986 class PrintHeapRegionClosure: public HeapRegionClosure { | |
| 4987 public: | |
| 4988 bool doHeapRegion(HeapRegion *r) { | |
| 4989 gclog_or_tty->print("Region: "PTR_FORMAT":", r); | |
| 4990 if (r != NULL) { | |
| 4991 if (r->is_on_free_list()) | |
| 4992 gclog_or_tty->print("Free "); | |
| 4993 if (r->is_young()) | |
| 4994 gclog_or_tty->print("Young "); | |
| 4995 if (r->isHumongous()) | |
| 4996 gclog_or_tty->print("Is Humongous "); | |
| 4997 r->print(); | |
| 4998 } | |
| 4999 return false; | |
| 5000 } | |
| 5001 }; | |
| 5002 | |
| 5003 class SortHeapRegionClosure : public HeapRegionClosure { | |
| 5004 size_t young_regions,free_regions, unclean_regions; | |
| 5005 size_t hum_regions, count; | |
| 5006 size_t unaccounted, cur_unclean, cur_alloc; | |
| 5007 size_t total_free; | |
| 5008 HeapRegion* cur; | |
| 5009 public: | |
| 5010 SortHeapRegionClosure(HeapRegion *_cur) : cur(_cur), young_regions(0), | |
| 5011 free_regions(0), unclean_regions(0), | |
| 5012 hum_regions(0), | |
| 5013 count(0), unaccounted(0), | |
| 5014 cur_alloc(0), total_free(0) | |
| 5015 {} | |
| 5016 bool doHeapRegion(HeapRegion *r) { | |
| 5017 count++; | |
| 5018 if (r->is_on_free_list()) free_regions++; | |
| 5019 else if (r->is_on_unclean_list()) unclean_regions++; | |
| 5020 else if (r->isHumongous()) hum_regions++; | |
| 5021 else if (r->is_young()) young_regions++; | |
| 5022 else if (r == cur) cur_alloc++; | |
| 5023 else unaccounted++; | |
| 5024 return false; | |
| 5025 } | |
| 5026 void print() { | |
| 5027 total_free = free_regions + unclean_regions; | |
| 5028 gclog_or_tty->print("%d regions\n", count); | |
| 5029 gclog_or_tty->print("%d free: free_list = %d unclean = %d\n", | |
| 5030 total_free, free_regions, unclean_regions); | |
| 5031 gclog_or_tty->print("%d humongous %d young\n", | |
| 5032 hum_regions, young_regions); | |
| 5033 gclog_or_tty->print("%d cur_alloc\n", cur_alloc); | |
| 5034 gclog_or_tty->print("UHOH unaccounted = %d\n", unaccounted); | |
| 5035 } | |
| 5036 }; | |
| 5037 | |
| 5038 void G1CollectedHeap::print_region_counts() { | |
| 5039 SortHeapRegionClosure sc(_cur_alloc_region); | |
| 5040 PrintHeapRegionClosure cl; | |
| 5041 heap_region_iterate(&cl); | |
| 5042 heap_region_iterate(&sc); | |
| 5043 sc.print(); | |
| 5044 print_region_accounting_info(); | |
| 5045 }; | |
| 5046 | |
| 5047 bool G1CollectedHeap::regions_accounted_for() { | |
| 5048 // TODO: regions accounting for young/survivor/tenured | |
| 5049 return true; | |
| 5050 } | |
| 5051 | |
| 5052 bool G1CollectedHeap::print_region_accounting_info() { | |
| 5053 gclog_or_tty->print_cr("Free regions: %d (count: %d count list %d) (clean: %d unclean: %d).", | |
| 5054 free_regions(), | |
| 5055 count_free_regions(), count_free_regions_list(), | |
| 5056 _free_region_list_size, _unclean_region_list.sz()); | |
| 5057 gclog_or_tty->print_cr("cur_alloc: %d.", | |
| 5058 (_cur_alloc_region == NULL ? 0 : 1)); | |
| 5059 gclog_or_tty->print_cr("H regions: %d.", _num_humongous_regions); | |
| 5060 | |
| 5061 // TODO: check regions accounting for young/survivor/tenured | |
| 5062 return true; | |
| 5063 } | |
| 5064 | |
| 5065 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
| 5066 HeapRegion* hr = heap_region_containing(p); | |
| 5067 if (hr == NULL) { | |
| 5068 return is_in_permanent(p); | |
| 5069 } else { | |
| 5070 return hr->is_in(p); | |
| 5071 } | |
| 5072 } | |
| 941 | 5073 #endif // !PRODUCT |
| 342 | 5074 |
| 5075 void G1CollectedHeap::g1_unimplemented() { | |
| 5076 // Unimplemented(); | |
| 5077 } |