Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 647:bd441136a5ce
Merge
| author | kvn |
|---|---|
| date | Thu, 19 Mar 2009 09:13:24 -0700 |
| parents | ba50942c8138 660978a2a31a |
| children | 96b229c54d1e |
| 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 | |
| 28 // turn it on so that the contents of the young list (scan-only / | |
| 29 // to-be-collected) are printed at "strategic" points before / during | |
| 30 // / after the collection --- this is useful for debugging | |
| 31 #define SCAN_ONLY_VERBOSE 0 | |
| 32 // CURRENT STATUS | |
| 33 // This file is under construction. Search for "FIXME". | |
| 34 | |
| 35 // INVARIANTS/NOTES | |
| 36 // | |
| 37 // All allocation activity covered by the G1CollectedHeap interface is | |
| 38 // serialized by acquiring the HeapLock. This happens in | |
| 39 // mem_allocate_work, which all such allocation functions call. | |
| 40 // (Note that this does not apply to TLAB allocation, which is not part | |
| 41 // of this interface: it is done by clients of this interface.) | |
| 42 | |
| 43 // Local to this file. | |
| 44 | |
| 45 // Finds the first HeapRegion. | |
| 46 // No longer used, but might be handy someday. | |
| 47 | |
| 48 class FindFirstRegionClosure: public HeapRegionClosure { | |
| 49 HeapRegion* _a_region; | |
| 50 public: | |
| 51 FindFirstRegionClosure() : _a_region(NULL) {} | |
| 52 bool doHeapRegion(HeapRegion* r) { | |
| 53 _a_region = r; | |
| 54 return true; | |
| 55 } | |
| 56 HeapRegion* result() { return _a_region; } | |
| 57 }; | |
| 58 | |
| 59 | |
| 60 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
| 61 SuspendibleThreadSet* _sts; | |
| 62 G1RemSet* _g1rs; | |
| 63 ConcurrentG1Refine* _cg1r; | |
| 64 bool _concurrent; | |
| 65 public: | |
| 66 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
| 67 G1RemSet* g1rs, | |
| 68 ConcurrentG1Refine* cg1r) : | |
| 69 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
| 70 {} | |
| 71 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 72 _g1rs->concurrentRefineOneCard(card_ptr, worker_i); | |
| 73 if (_concurrent && _sts->should_yield()) { | |
| 74 // Caller will actually yield. | |
| 75 return false; | |
| 76 } | |
| 77 // Otherwise, we finished successfully; return true. | |
| 78 return true; | |
| 79 } | |
| 80 void set_concurrent(bool b) { _concurrent = b; } | |
| 81 }; | |
| 82 | |
| 83 | |
| 84 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 85 int _calls; | |
| 86 G1CollectedHeap* _g1h; | |
| 87 CardTableModRefBS* _ctbs; | |
| 88 int _histo[256]; | |
| 89 public: | |
| 90 ClearLoggedCardTableEntryClosure() : | |
| 91 _calls(0) | |
| 92 { | |
| 93 _g1h = G1CollectedHeap::heap(); | |
| 94 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 95 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
| 96 } | |
| 97 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 98 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 99 _calls++; | |
| 100 unsigned char* ujb = (unsigned char*)card_ptr; | |
| 101 int ind = (int)(*ujb); | |
| 102 _histo[ind]++; | |
| 103 *card_ptr = -1; | |
| 104 } | |
| 105 return true; | |
| 106 } | |
| 107 int calls() { return _calls; } | |
| 108 void print_histo() { | |
| 109 gclog_or_tty->print_cr("Card table value histogram:"); | |
| 110 for (int i = 0; i < 256; i++) { | |
| 111 if (_histo[i] != 0) { | |
| 112 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
| 113 } | |
| 114 } | |
| 115 } | |
| 116 }; | |
| 117 | |
| 118 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 119 int _calls; | |
| 120 G1CollectedHeap* _g1h; | |
| 121 CardTableModRefBS* _ctbs; | |
| 122 public: | |
| 123 RedirtyLoggedCardTableEntryClosure() : | |
| 124 _calls(0) | |
| 125 { | |
| 126 _g1h = G1CollectedHeap::heap(); | |
| 127 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 128 } | |
| 129 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 130 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 131 _calls++; | |
| 132 *card_ptr = 0; | |
| 133 } | |
| 134 return true; | |
| 135 } | |
| 136 int calls() { return _calls; } | |
| 137 }; | |
| 138 | |
|
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139 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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140 public: |
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141 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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142 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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143 return true; |
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144 } |
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145 }; |
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146 |
| 342 | 147 YoungList::YoungList(G1CollectedHeap* g1h) |
| 148 : _g1h(g1h), _head(NULL), | |
| 149 _scan_only_head(NULL), _scan_only_tail(NULL), _curr_scan_only(NULL), | |
| 150 _length(0), _scan_only_length(0), | |
| 151 _last_sampled_rs_lengths(0), | |
| 545 | 152 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) |
| 342 | 153 { |
| 154 guarantee( check_list_empty(false), "just making sure..." ); | |
| 155 } | |
| 156 | |
| 157 void YoungList::push_region(HeapRegion *hr) { | |
| 158 assert(!hr->is_young(), "should not already be young"); | |
| 159 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
| 160 | |
| 161 hr->set_next_young_region(_head); | |
| 162 _head = hr; | |
| 163 | |
| 164 hr->set_young(); | |
| 165 double yg_surv_rate = _g1h->g1_policy()->predict_yg_surv_rate((int)_length); | |
| 166 ++_length; | |
| 167 } | |
| 168 | |
| 169 void YoungList::add_survivor_region(HeapRegion* hr) { | |
| 545 | 170 assert(hr->is_survivor(), "should be flagged as survivor region"); |
| 342 | 171 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
| 172 | |
| 173 hr->set_next_young_region(_survivor_head); | |
| 174 if (_survivor_head == NULL) { | |
| 545 | 175 _survivor_tail = hr; |
| 342 | 176 } |
| 177 _survivor_head = hr; | |
| 178 | |
| 179 ++_survivor_length; | |
| 180 } | |
| 181 | |
| 182 HeapRegion* YoungList::pop_region() { | |
| 183 while (_head != NULL) { | |
| 184 assert( length() > 0, "list should not be empty" ); | |
| 185 HeapRegion* ret = _head; | |
| 186 _head = ret->get_next_young_region(); | |
| 187 ret->set_next_young_region(NULL); | |
| 188 --_length; | |
| 189 assert(ret->is_young(), "region should be very young"); | |
| 190 | |
| 191 // Replace 'Survivor' region type with 'Young'. So the region will | |
| 192 // be treated as a young region and will not be 'confused' with | |
| 193 // newly created survivor regions. | |
| 194 if (ret->is_survivor()) { | |
| 195 ret->set_young(); | |
| 196 } | |
| 197 | |
| 198 if (!ret->is_scan_only()) { | |
| 199 return ret; | |
| 200 } | |
| 201 | |
| 202 // scan-only, we'll add it to the scan-only list | |
| 203 if (_scan_only_tail == NULL) { | |
| 204 guarantee( _scan_only_head == NULL, "invariant" ); | |
| 205 | |
| 206 _scan_only_head = ret; | |
| 207 _curr_scan_only = ret; | |
| 208 } else { | |
| 209 guarantee( _scan_only_head != NULL, "invariant" ); | |
| 210 _scan_only_tail->set_next_young_region(ret); | |
| 211 } | |
| 212 guarantee( ret->get_next_young_region() == NULL, "invariant" ); | |
| 213 _scan_only_tail = ret; | |
| 214 | |
| 215 // no need to be tagged as scan-only any more | |
| 216 ret->set_young(); | |
| 217 | |
| 218 ++_scan_only_length; | |
| 219 } | |
| 220 assert( length() == 0, "list should be empty" ); | |
| 221 return NULL; | |
| 222 } | |
| 223 | |
| 224 void YoungList::empty_list(HeapRegion* list) { | |
| 225 while (list != NULL) { | |
| 226 HeapRegion* next = list->get_next_young_region(); | |
| 227 list->set_next_young_region(NULL); | |
| 228 list->uninstall_surv_rate_group(); | |
| 229 list->set_not_young(); | |
| 230 list = next; | |
| 231 } | |
| 232 } | |
| 233 | |
| 234 void YoungList::empty_list() { | |
| 235 assert(check_list_well_formed(), "young list should be well formed"); | |
| 236 | |
| 237 empty_list(_head); | |
| 238 _head = NULL; | |
| 239 _length = 0; | |
| 240 | |
| 241 empty_list(_scan_only_head); | |
| 242 _scan_only_head = NULL; | |
| 243 _scan_only_tail = NULL; | |
| 244 _scan_only_length = 0; | |
| 245 _curr_scan_only = NULL; | |
| 246 | |
| 247 empty_list(_survivor_head); | |
| 248 _survivor_head = NULL; | |
| 545 | 249 _survivor_tail = NULL; |
| 342 | 250 _survivor_length = 0; |
| 251 | |
| 252 _last_sampled_rs_lengths = 0; | |
| 253 | |
| 254 assert(check_list_empty(false), "just making sure..."); | |
| 255 } | |
| 256 | |
| 257 bool YoungList::check_list_well_formed() { | |
| 258 bool ret = true; | |
| 259 | |
| 260 size_t length = 0; | |
| 261 HeapRegion* curr = _head; | |
| 262 HeapRegion* last = NULL; | |
| 263 while (curr != NULL) { | |
| 264 if (!curr->is_young() || curr->is_scan_only()) { | |
| 265 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " | |
| 266 "incorrectly tagged (%d, %d)", | |
| 267 curr->bottom(), curr->end(), | |
| 268 curr->is_young(), curr->is_scan_only()); | |
| 269 ret = false; | |
| 270 } | |
| 271 ++length; | |
| 272 last = curr; | |
| 273 curr = curr->get_next_young_region(); | |
| 274 } | |
| 275 ret = ret && (length == _length); | |
| 276 | |
| 277 if (!ret) { | |
| 278 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
| 279 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
| 280 length, _length); | |
| 281 } | |
| 282 | |
| 283 bool scan_only_ret = true; | |
| 284 length = 0; | |
| 285 curr = _scan_only_head; | |
| 286 last = NULL; | |
| 287 while (curr != NULL) { | |
| 288 if (!curr->is_young() || curr->is_scan_only()) { | |
| 289 gclog_or_tty->print_cr("### SCAN-ONLY REGION "PTR_FORMAT"-"PTR_FORMAT" " | |
| 290 "incorrectly tagged (%d, %d)", | |
| 291 curr->bottom(), curr->end(), | |
| 292 curr->is_young(), curr->is_scan_only()); | |
| 293 scan_only_ret = false; | |
| 294 } | |
| 295 ++length; | |
| 296 last = curr; | |
| 297 curr = curr->get_next_young_region(); | |
| 298 } | |
| 299 scan_only_ret = scan_only_ret && (length == _scan_only_length); | |
| 300 | |
| 301 if ( (last != _scan_only_tail) || | |
| 302 (_scan_only_head == NULL && _scan_only_tail != NULL) || | |
| 303 (_scan_only_head != NULL && _scan_only_tail == NULL) ) { | |
| 304 gclog_or_tty->print_cr("## _scan_only_tail is set incorrectly"); | |
| 305 scan_only_ret = false; | |
| 306 } | |
| 307 | |
| 308 if (_curr_scan_only != NULL && _curr_scan_only != _scan_only_head) { | |
| 309 gclog_or_tty->print_cr("### _curr_scan_only is set incorrectly"); | |
| 310 scan_only_ret = false; | |
| 311 } | |
| 312 | |
| 313 if (!scan_only_ret) { | |
| 314 gclog_or_tty->print_cr("### SCAN-ONLY LIST seems not well formed!"); | |
| 315 gclog_or_tty->print_cr("### list has %d entries, _scan_only_length is %d", | |
| 316 length, _scan_only_length); | |
| 317 } | |
| 318 | |
| 319 return ret && scan_only_ret; | |
| 320 } | |
| 321 | |
| 322 bool YoungList::check_list_empty(bool ignore_scan_only_list, | |
| 323 bool check_sample) { | |
| 324 bool ret = true; | |
| 325 | |
| 326 if (_length != 0) { | |
| 327 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
| 328 _length); | |
| 329 ret = false; | |
| 330 } | |
| 331 if (check_sample && _last_sampled_rs_lengths != 0) { | |
| 332 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
| 333 ret = false; | |
| 334 } | |
| 335 if (_head != NULL) { | |
| 336 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
| 337 ret = false; | |
| 338 } | |
| 339 if (!ret) { | |
| 340 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
| 341 } | |
| 342 | |
| 343 if (ignore_scan_only_list) | |
| 344 return ret; | |
| 345 | |
| 346 bool scan_only_ret = true; | |
| 347 if (_scan_only_length != 0) { | |
| 348 gclog_or_tty->print_cr("### SCAN-ONLY LIST should have 0 length, not %d", | |
| 349 _scan_only_length); | |
| 350 scan_only_ret = false; | |
| 351 } | |
| 352 if (_scan_only_head != NULL) { | |
| 353 gclog_or_tty->print_cr("### SCAN-ONLY LIST does not have a NULL head"); | |
| 354 scan_only_ret = false; | |
| 355 } | |
| 356 if (_scan_only_tail != NULL) { | |
| 357 gclog_or_tty->print_cr("### SCAN-ONLY LIST does not have a NULL tail"); | |
| 358 scan_only_ret = false; | |
| 359 } | |
| 360 if (!scan_only_ret) { | |
| 361 gclog_or_tty->print_cr("### SCAN-ONLY LIST does not seem empty"); | |
| 362 } | |
| 363 | |
| 364 return ret && scan_only_ret; | |
| 365 } | |
| 366 | |
| 367 void | |
| 368 YoungList::rs_length_sampling_init() { | |
| 369 _sampled_rs_lengths = 0; | |
| 370 _curr = _head; | |
| 371 } | |
| 372 | |
| 373 bool | |
| 374 YoungList::rs_length_sampling_more() { | |
| 375 return _curr != NULL; | |
| 376 } | |
| 377 | |
| 378 void | |
| 379 YoungList::rs_length_sampling_next() { | |
| 380 assert( _curr != NULL, "invariant" ); | |
| 381 _sampled_rs_lengths += _curr->rem_set()->occupied(); | |
| 382 _curr = _curr->get_next_young_region(); | |
| 383 if (_curr == NULL) { | |
| 384 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
| 385 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
| 386 } | |
| 387 } | |
| 388 | |
| 389 void | |
| 390 YoungList::reset_auxilary_lists() { | |
| 391 // We could have just "moved" the scan-only list to the young list. | |
| 392 // However, the scan-only list is ordered according to the region | |
| 393 // age in descending order, so, by moving one entry at a time, we | |
| 394 // ensure that it is recreated in ascending order. | |
| 395 | |
| 396 guarantee( is_empty(), "young list should be empty" ); | |
| 397 assert(check_list_well_formed(), "young list should be well formed"); | |
| 398 | |
| 399 // Add survivor regions to SurvRateGroup. | |
| 400 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
| 545 | 401 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
| 342 | 402 for (HeapRegion* curr = _survivor_head; |
| 403 curr != NULL; | |
| 404 curr = curr->get_next_young_region()) { | |
| 405 _g1h->g1_policy()->set_region_survivors(curr); | |
| 406 } | |
| 407 _g1h->g1_policy()->note_stop_adding_survivor_regions(); | |
| 408 | |
| 409 if (_survivor_head != NULL) { | |
| 410 _head = _survivor_head; | |
| 411 _length = _survivor_length + _scan_only_length; | |
| 545 | 412 _survivor_tail->set_next_young_region(_scan_only_head); |
| 342 | 413 } else { |
| 414 _head = _scan_only_head; | |
| 415 _length = _scan_only_length; | |
| 416 } | |
| 417 | |
| 418 for (HeapRegion* curr = _scan_only_head; | |
| 419 curr != NULL; | |
| 420 curr = curr->get_next_young_region()) { | |
| 421 curr->recalculate_age_in_surv_rate_group(); | |
| 422 } | |
| 423 _scan_only_head = NULL; | |
| 424 _scan_only_tail = NULL; | |
| 425 _scan_only_length = 0; | |
| 426 _curr_scan_only = NULL; | |
| 427 | |
| 428 _survivor_head = NULL; | |
| 545 | 429 _survivor_tail = NULL; |
| 342 | 430 _survivor_length = 0; |
| 545 | 431 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
| 342 | 432 |
| 433 assert(check_list_well_formed(), "young list should be well formed"); | |
| 434 } | |
| 435 | |
| 436 void YoungList::print() { | |
| 437 HeapRegion* lists[] = {_head, _scan_only_head, _survivor_head}; | |
| 438 const char* names[] = {"YOUNG", "SCAN-ONLY", "SURVIVOR"}; | |
| 439 | |
| 440 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
| 441 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
| 442 HeapRegion *curr = lists[list]; | |
| 443 if (curr == NULL) | |
| 444 gclog_or_tty->print_cr(" empty"); | |
| 445 while (curr != NULL) { | |
| 446 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
| 447 "age: %4d, y: %d, s-o: %d, surv: %d", | |
| 448 curr->bottom(), curr->end(), | |
| 449 curr->top(), | |
| 450 curr->prev_top_at_mark_start(), | |
| 451 curr->next_top_at_mark_start(), | |
| 452 curr->top_at_conc_mark_count(), | |
| 453 curr->age_in_surv_rate_group_cond(), | |
| 454 curr->is_young(), | |
| 455 curr->is_scan_only(), | |
| 456 curr->is_survivor()); | |
| 457 curr = curr->get_next_young_region(); | |
| 458 } | |
| 459 } | |
| 460 | |
| 461 gclog_or_tty->print_cr(""); | |
| 462 } | |
| 463 | |
| 464 void G1CollectedHeap::stop_conc_gc_threads() { | |
| 465 _cg1r->cg1rThread()->stop(); | |
| 466 _czft->stop(); | |
| 467 _cmThread->stop(); | |
| 468 } | |
| 469 | |
| 470 | |
| 471 void G1CollectedHeap::check_ct_logs_at_safepoint() { | |
| 472 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 473 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
| 474 | |
| 475 // Count the dirty cards at the start. | |
| 476 CountNonCleanMemRegionClosure count1(this); | |
| 477 ct_bs->mod_card_iterate(&count1); | |
| 478 int orig_count = count1.n(); | |
| 479 | |
| 480 // First clear the logged cards. | |
| 481 ClearLoggedCardTableEntryClosure clear; | |
| 482 dcqs.set_closure(&clear); | |
| 483 dcqs.apply_closure_to_all_completed_buffers(); | |
| 484 dcqs.iterate_closure_all_threads(false); | |
| 485 clear.print_histo(); | |
| 486 | |
| 487 // Now ensure that there's no dirty cards. | |
| 488 CountNonCleanMemRegionClosure count2(this); | |
| 489 ct_bs->mod_card_iterate(&count2); | |
| 490 if (count2.n() != 0) { | |
| 491 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
| 492 count2.n(), orig_count); | |
| 493 } | |
| 494 guarantee(count2.n() == 0, "Card table should be clean."); | |
| 495 | |
| 496 RedirtyLoggedCardTableEntryClosure redirty; | |
| 497 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
| 498 dcqs.apply_closure_to_all_completed_buffers(); | |
| 499 dcqs.iterate_closure_all_threads(false); | |
| 500 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
| 501 clear.calls(), orig_count); | |
| 502 guarantee(redirty.calls() == clear.calls(), | |
| 503 "Or else mechanism is broken."); | |
| 504 | |
| 505 CountNonCleanMemRegionClosure count3(this); | |
| 506 ct_bs->mod_card_iterate(&count3); | |
| 507 if (count3.n() != orig_count) { | |
| 508 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
| 509 orig_count, count3.n()); | |
| 510 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
| 511 } | |
| 512 | |
| 513 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 514 } | |
| 515 | |
| 516 // Private class members. | |
| 517 | |
| 518 G1CollectedHeap* G1CollectedHeap::_g1h; | |
| 519 | |
| 520 // Private methods. | |
| 521 | |
| 522 // Finds a HeapRegion that can be used to allocate a given size of block. | |
| 523 | |
| 524 | |
| 525 HeapRegion* G1CollectedHeap::newAllocRegion_work(size_t word_size, | |
| 526 bool do_expand, | |
| 527 bool zero_filled) { | |
| 528 ConcurrentZFThread::note_region_alloc(); | |
| 529 HeapRegion* res = alloc_free_region_from_lists(zero_filled); | |
| 530 if (res == NULL && do_expand) { | |
| 531 expand(word_size * HeapWordSize); | |
| 532 res = alloc_free_region_from_lists(zero_filled); | |
| 533 assert(res == NULL || | |
| 534 (!res->isHumongous() && | |
| 535 (!zero_filled || | |
| 536 res->zero_fill_state() == HeapRegion::Allocated)), | |
| 537 "Alloc Regions must be zero filled (and non-H)"); | |
| 538 } | |
| 539 if (res != NULL && res->is_empty()) _free_regions--; | |
| 540 assert(res == NULL || | |
| 541 (!res->isHumongous() && | |
| 542 (!zero_filled || | |
| 543 res->zero_fill_state() == HeapRegion::Allocated)), | |
| 544 "Non-young alloc Regions must be zero filled (and non-H)"); | |
| 545 | |
| 546 if (G1TraceRegions) { | |
| 547 if (res != NULL) { | |
| 548 gclog_or_tty->print_cr("new alloc region %d:["PTR_FORMAT", "PTR_FORMAT"], " | |
| 549 "top "PTR_FORMAT, | |
| 550 res->hrs_index(), res->bottom(), res->end(), res->top()); | |
| 551 } | |
| 552 } | |
| 553 | |
| 554 return res; | |
| 555 } | |
| 556 | |
| 557 HeapRegion* G1CollectedHeap::newAllocRegionWithExpansion(int purpose, | |
| 558 size_t word_size, | |
| 559 bool zero_filled) { | |
| 560 HeapRegion* alloc_region = NULL; | |
| 561 if (_gc_alloc_region_counts[purpose] < g1_policy()->max_regions(purpose)) { | |
| 562 alloc_region = newAllocRegion_work(word_size, true, zero_filled); | |
| 563 if (purpose == GCAllocForSurvived && alloc_region != NULL) { | |
| 545 | 564 alloc_region->set_survivor(); |
| 342 | 565 } |
| 566 ++_gc_alloc_region_counts[purpose]; | |
| 567 } else { | |
| 568 g1_policy()->note_alloc_region_limit_reached(purpose); | |
| 569 } | |
| 570 return alloc_region; | |
| 571 } | |
| 572 | |
| 573 // If could fit into free regions w/o expansion, try. | |
| 574 // Otherwise, if can expand, do so. | |
| 575 // Otherwise, if using ex regions might help, try with ex given back. | |
| 576 HeapWord* G1CollectedHeap::humongousObjAllocate(size_t word_size) { | |
| 577 assert(regions_accounted_for(), "Region leakage!"); | |
| 578 | |
| 579 // We can't allocate H regions while cleanupComplete is running, since | |
| 580 // some of the regions we find to be empty might not yet be added to the | |
| 581 // unclean list. (If we're already at a safepoint, this call is | |
| 582 // unnecessary, not to mention wrong.) | |
| 583 if (!SafepointSynchronize::is_at_safepoint()) | |
| 584 wait_for_cleanup_complete(); | |
| 585 | |
| 586 size_t num_regions = | |
| 587 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; | |
| 588 | |
| 589 // Special case if < one region??? | |
| 590 | |
| 591 // Remember the ft size. | |
| 592 size_t x_size = expansion_regions(); | |
| 593 | |
| 594 HeapWord* res = NULL; | |
| 595 bool eliminated_allocated_from_lists = false; | |
| 596 | |
| 597 // Can the allocation potentially fit in the free regions? | |
| 598 if (free_regions() >= num_regions) { | |
| 599 res = _hrs->obj_allocate(word_size); | |
| 600 } | |
| 601 if (res == NULL) { | |
| 602 // Try expansion. | |
| 603 size_t fs = _hrs->free_suffix(); | |
| 604 if (fs + x_size >= num_regions) { | |
| 605 expand((num_regions - fs) * HeapRegion::GrainBytes); | |
| 606 res = _hrs->obj_allocate(word_size); | |
| 607 assert(res != NULL, "This should have worked."); | |
| 608 } else { | |
| 609 // Expansion won't help. Are there enough free regions if we get rid | |
| 610 // of reservations? | |
| 611 size_t avail = free_regions(); | |
| 612 if (avail >= num_regions) { | |
| 613 res = _hrs->obj_allocate(word_size); | |
| 614 if (res != NULL) { | |
| 615 remove_allocated_regions_from_lists(); | |
| 616 eliminated_allocated_from_lists = true; | |
| 617 } | |
| 618 } | |
| 619 } | |
| 620 } | |
| 621 if (res != NULL) { | |
| 622 // Increment by the number of regions allocated. | |
| 623 // FIXME: Assumes regions all of size GrainBytes. | |
| 624 #ifndef PRODUCT | |
| 625 mr_bs()->verify_clean_region(MemRegion(res, res + num_regions * | |
| 626 HeapRegion::GrainWords)); | |
| 627 #endif | |
| 628 if (!eliminated_allocated_from_lists) | |
| 629 remove_allocated_regions_from_lists(); | |
| 630 _summary_bytes_used += word_size * HeapWordSize; | |
| 631 _free_regions -= num_regions; | |
| 632 _num_humongous_regions += (int) num_regions; | |
| 633 } | |
| 634 assert(regions_accounted_for(), "Region Leakage"); | |
| 635 return res; | |
| 636 } | |
| 637 | |
| 638 HeapWord* | |
| 639 G1CollectedHeap::attempt_allocation_slow(size_t word_size, | |
| 640 bool permit_collection_pause) { | |
| 641 HeapWord* res = NULL; | |
| 642 HeapRegion* allocated_young_region = NULL; | |
| 643 | |
| 644 assert( SafepointSynchronize::is_at_safepoint() || | |
| 645 Heap_lock->owned_by_self(), "pre condition of the call" ); | |
| 646 | |
| 647 if (isHumongous(word_size)) { | |
| 648 // Allocation of a humongous object can, in a sense, complete a | |
| 649 // partial region, if the previous alloc was also humongous, and | |
| 650 // caused the test below to succeed. | |
| 651 if (permit_collection_pause) | |
| 652 do_collection_pause_if_appropriate(word_size); | |
| 653 res = humongousObjAllocate(word_size); | |
| 654 assert(_cur_alloc_region == NULL | |
| 655 || !_cur_alloc_region->isHumongous(), | |
| 656 "Prevent a regression of this bug."); | |
| 657 | |
| 658 } else { | |
|
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659 // We may have concurrent cleanup working at the time. Wait for it |
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660 // to complete. In the future we would probably want to make the |
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661 // concurrent cleanup truly concurrent by decoupling it from the |
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662 // allocation. |
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663 if (!SafepointSynchronize::is_at_safepoint()) |
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664 wait_for_cleanup_complete(); |
| 342 | 665 // If we do a collection pause, this will be reset to a non-NULL |
| 666 // value. If we don't, nulling here ensures that we allocate a new | |
| 667 // region below. | |
| 668 if (_cur_alloc_region != NULL) { | |
| 669 // We're finished with the _cur_alloc_region. | |
| 670 _summary_bytes_used += _cur_alloc_region->used(); | |
| 671 _cur_alloc_region = NULL; | |
| 672 } | |
| 673 assert(_cur_alloc_region == NULL, "Invariant."); | |
| 674 // Completion of a heap region is perhaps a good point at which to do | |
| 675 // a collection pause. | |
| 676 if (permit_collection_pause) | |
| 677 do_collection_pause_if_appropriate(word_size); | |
| 678 // Make sure we have an allocation region available. | |
| 679 if (_cur_alloc_region == NULL) { | |
| 680 if (!SafepointSynchronize::is_at_safepoint()) | |
| 681 wait_for_cleanup_complete(); | |
| 682 bool next_is_young = should_set_young_locked(); | |
| 683 // If the next region is not young, make sure it's zero-filled. | |
| 684 _cur_alloc_region = newAllocRegion(word_size, !next_is_young); | |
| 685 if (_cur_alloc_region != NULL) { | |
| 686 _summary_bytes_used -= _cur_alloc_region->used(); | |
| 687 if (next_is_young) { | |
| 688 set_region_short_lived_locked(_cur_alloc_region); | |
| 689 allocated_young_region = _cur_alloc_region; | |
| 690 } | |
| 691 } | |
| 692 } | |
| 693 assert(_cur_alloc_region == NULL || !_cur_alloc_region->isHumongous(), | |
| 694 "Prevent a regression of this bug."); | |
| 695 | |
| 696 // Now retry the allocation. | |
| 697 if (_cur_alloc_region != NULL) { | |
| 698 res = _cur_alloc_region->allocate(word_size); | |
| 699 } | |
| 700 } | |
| 701 | |
| 702 // NOTE: fails frequently in PRT | |
| 703 assert(regions_accounted_for(), "Region leakage!"); | |
| 704 | |
| 705 if (res != NULL) { | |
| 706 if (!SafepointSynchronize::is_at_safepoint()) { | |
| 707 assert( permit_collection_pause, "invariant" ); | |
| 708 assert( Heap_lock->owned_by_self(), "invariant" ); | |
| 709 Heap_lock->unlock(); | |
| 710 } | |
| 711 | |
| 712 if (allocated_young_region != NULL) { | |
| 713 HeapRegion* hr = allocated_young_region; | |
| 714 HeapWord* bottom = hr->bottom(); | |
| 715 HeapWord* end = hr->end(); | |
| 716 MemRegion mr(bottom, end); | |
| 717 ((CardTableModRefBS*)_g1h->barrier_set())->dirty(mr); | |
| 718 } | |
| 719 } | |
| 720 | |
| 721 assert( SafepointSynchronize::is_at_safepoint() || | |
| 722 (res == NULL && Heap_lock->owned_by_self()) || | |
| 723 (res != NULL && !Heap_lock->owned_by_self()), | |
| 724 "post condition of the call" ); | |
| 725 | |
| 726 return res; | |
| 727 } | |
| 728 | |
| 729 HeapWord* | |
| 730 G1CollectedHeap::mem_allocate(size_t word_size, | |
| 731 bool is_noref, | |
| 732 bool is_tlab, | |
| 733 bool* gc_overhead_limit_was_exceeded) { | |
| 734 debug_only(check_for_valid_allocation_state()); | |
| 735 assert(no_gc_in_progress(), "Allocation during gc not allowed"); | |
| 736 HeapWord* result = NULL; | |
| 737 | |
| 738 // Loop until the allocation is satisified, | |
| 739 // or unsatisfied after GC. | |
| 740 for (int try_count = 1; /* return or throw */; try_count += 1) { | |
| 741 int gc_count_before; | |
| 742 { | |
| 743 Heap_lock->lock(); | |
| 744 result = attempt_allocation(word_size); | |
| 745 if (result != NULL) { | |
| 746 // attempt_allocation should have unlocked the heap lock | |
| 747 assert(is_in(result), "result not in heap"); | |
| 748 return result; | |
| 749 } | |
| 750 // Read the gc count while the heap lock is held. | |
| 751 gc_count_before = SharedHeap::heap()->total_collections(); | |
| 752 Heap_lock->unlock(); | |
| 753 } | |
| 754 | |
| 755 // Create the garbage collection operation... | |
| 756 VM_G1CollectForAllocation op(word_size, | |
| 757 gc_count_before); | |
| 758 | |
| 759 // ...and get the VM thread to execute it. | |
| 760 VMThread::execute(&op); | |
| 761 if (op.prologue_succeeded()) { | |
| 762 result = op.result(); | |
| 763 assert(result == NULL || is_in(result), "result not in heap"); | |
| 764 return result; | |
| 765 } | |
| 766 | |
| 767 // Give a warning if we seem to be looping forever. | |
| 768 if ((QueuedAllocationWarningCount > 0) && | |
| 769 (try_count % QueuedAllocationWarningCount == 0)) { | |
| 770 warning("G1CollectedHeap::mem_allocate_work retries %d times", | |
| 771 try_count); | |
| 772 } | |
| 773 } | |
| 774 } | |
| 775 | |
| 776 void G1CollectedHeap::abandon_cur_alloc_region() { | |
| 777 if (_cur_alloc_region != NULL) { | |
| 778 // We're finished with the _cur_alloc_region. | |
| 779 if (_cur_alloc_region->is_empty()) { | |
| 780 _free_regions++; | |
| 781 free_region(_cur_alloc_region); | |
| 782 } else { | |
| 783 _summary_bytes_used += _cur_alloc_region->used(); | |
| 784 } | |
| 785 _cur_alloc_region = NULL; | |
| 786 } | |
| 787 } | |
| 788 | |
| 636 | 789 void G1CollectedHeap::abandon_gc_alloc_regions() { |
| 790 // first, make sure that the GC alloc region list is empty (it should!) | |
| 791 assert(_gc_alloc_region_list == NULL, "invariant"); | |
| 792 release_gc_alloc_regions(true /* totally */); | |
| 793 } | |
| 794 | |
| 342 | 795 class PostMCRemSetClearClosure: public HeapRegionClosure { |
| 796 ModRefBarrierSet* _mr_bs; | |
| 797 public: | |
| 798 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 799 bool doHeapRegion(HeapRegion* r) { | |
| 800 r->reset_gc_time_stamp(); | |
| 801 if (r->continuesHumongous()) | |
| 802 return false; | |
| 803 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 804 if (hrrs != NULL) hrrs->clear(); | |
| 805 // You might think here that we could clear just the cards | |
| 806 // corresponding to the used region. But no: if we leave a dirty card | |
| 807 // in a region we might allocate into, then it would prevent that card | |
| 808 // from being enqueued, and cause it to be missed. | |
| 809 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
| 810 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
| 811 return false; | |
| 812 } | |
| 813 }; | |
| 814 | |
| 815 | |
| 816 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
| 817 ModRefBarrierSet* _mr_bs; | |
| 818 public: | |
| 819 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 820 bool doHeapRegion(HeapRegion* r) { | |
| 821 if (r->continuesHumongous()) return false; | |
| 822 if (r->used_region().word_size() != 0) { | |
| 823 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
| 824 } | |
| 825 return false; | |
| 826 } | |
| 827 }; | |
| 828 | |
|
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829 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
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830 G1CollectedHeap* _g1h; |
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831 UpdateRSOopClosure _cl; |
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832 int _worker_i; |
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833 public: |
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834 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
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835 _cl(g1->g1_rem_set()->as_HRInto_G1RemSet(), worker_i), |
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836 _worker_i(worker_i), |
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837 _g1h(g1) |
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838 { } |
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839 bool doHeapRegion(HeapRegion* r) { |
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840 if (!r->continuesHumongous()) { |
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841 _cl.set_from(r); |
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842 r->oop_iterate(&_cl); |
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843 } |
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844 return false; |
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845 } |
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846 }; |
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847 |
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848 class ParRebuildRSTask: public AbstractGangTask { |
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849 G1CollectedHeap* _g1; |
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850 public: |
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851 ParRebuildRSTask(G1CollectedHeap* g1) |
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852 : AbstractGangTask("ParRebuildRSTask"), |
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853 _g1(g1) |
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854 { } |
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855 |
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856 void work(int i) { |
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857 RebuildRSOutOfRegionClosure rebuild_rs(_g1, i); |
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858 _g1->heap_region_par_iterate_chunked(&rebuild_rs, i, |
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859 HeapRegion::RebuildRSClaimValue); |
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860 } |
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861 }; |
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862 |
| 342 | 863 void G1CollectedHeap::do_collection(bool full, bool clear_all_soft_refs, |
| 864 size_t word_size) { | |
| 865 ResourceMark rm; | |
| 866 | |
| 867 if (full && DisableExplicitGC) { | |
| 868 gclog_or_tty->print("\n\n\nDisabling Explicit GC\n\n\n"); | |
| 869 return; | |
| 870 } | |
| 871 | |
| 872 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
| 873 assert(Thread::current() == VMThread::vm_thread(), "should be in vm thread"); | |
| 874 | |
| 875 if (GC_locker::is_active()) { | |
| 876 return; // GC is disabled (e.g. JNI GetXXXCritical operation) | |
| 877 } | |
| 878 | |
| 879 { | |
| 880 IsGCActiveMark x; | |
| 881 | |
| 882 // Timing | |
| 883 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
| 884 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
| 885 TraceTime t(full ? "Full GC (System.gc())" : "Full GC", PrintGC, true, gclog_or_tty); | |
| 886 | |
| 887 double start = os::elapsedTime(); | |
| 888 GCOverheadReporter::recordSTWStart(start); | |
| 889 g1_policy()->record_full_collection_start(); | |
| 890 | |
| 891 gc_prologue(true); | |
| 892 increment_total_collections(); | |
| 893 | |
| 894 size_t g1h_prev_used = used(); | |
| 895 assert(used() == recalculate_used(), "Should be equal"); | |
| 896 | |
| 897 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
| 898 HandleMark hm; // Discard invalid handles created during verification | |
| 899 prepare_for_verify(); | |
| 900 gclog_or_tty->print(" VerifyBeforeGC:"); | |
| 901 Universe::verify(true); | |
| 902 } | |
| 903 assert(regions_accounted_for(), "Region leakage!"); | |
| 904 | |
| 905 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 906 | |
| 907 // We want to discover references, but not process them yet. | |
| 908 // This mode is disabled in | |
| 909 // instanceRefKlass::process_discovered_references if the | |
| 910 // generation does some collection work, or | |
| 911 // instanceRefKlass::enqueue_discovered_references if the | |
| 912 // generation returns without doing any work. | |
| 913 ref_processor()->disable_discovery(); | |
| 914 ref_processor()->abandon_partial_discovery(); | |
| 915 ref_processor()->verify_no_references_recorded(); | |
| 916 | |
| 917 // Abandon current iterations of concurrent marking and concurrent | |
| 918 // refinement, if any are in progress. | |
| 919 concurrent_mark()->abort(); | |
| 920 | |
| 921 // Make sure we'll choose a new allocation region afterwards. | |
| 922 abandon_cur_alloc_region(); | |
| 636 | 923 abandon_gc_alloc_regions(); |
| 342 | 924 assert(_cur_alloc_region == NULL, "Invariant."); |
| 925 g1_rem_set()->as_HRInto_G1RemSet()->cleanupHRRS(); | |
| 926 tear_down_region_lists(); | |
| 927 set_used_regions_to_need_zero_fill(); | |
| 928 if (g1_policy()->in_young_gc_mode()) { | |
| 929 empty_young_list(); | |
| 930 g1_policy()->set_full_young_gcs(true); | |
| 931 } | |
| 932 | |
| 933 // Temporarily make reference _discovery_ single threaded (non-MT). | |
| 934 ReferenceProcessorMTMutator rp_disc_ser(ref_processor(), false); | |
| 935 | |
| 936 // Temporarily make refs discovery atomic | |
| 937 ReferenceProcessorAtomicMutator rp_disc_atomic(ref_processor(), true); | |
| 938 | |
| 939 // Temporarily clear _is_alive_non_header | |
| 940 ReferenceProcessorIsAliveMutator rp_is_alive_null(ref_processor(), NULL); | |
| 941 | |
| 942 ref_processor()->enable_discovery(); | |
|
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943 ref_processor()->setup_policy(clear_all_soft_refs); |
| 342 | 944 |
| 945 // Do collection work | |
| 946 { | |
| 947 HandleMark hm; // Discard invalid handles created during gc | |
| 948 G1MarkSweep::invoke_at_safepoint(ref_processor(), clear_all_soft_refs); | |
| 949 } | |
| 950 // Because freeing humongous regions may have added some unclean | |
| 951 // regions, it is necessary to tear down again before rebuilding. | |
| 952 tear_down_region_lists(); | |
| 953 rebuild_region_lists(); | |
| 954 | |
| 955 _summary_bytes_used = recalculate_used(); | |
| 956 | |
| 957 ref_processor()->enqueue_discovered_references(); | |
| 958 | |
| 959 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 960 | |
| 961 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { | |
| 962 HandleMark hm; // Discard invalid handles created during verification | |
| 963 gclog_or_tty->print(" VerifyAfterGC:"); | |
|
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964 prepare_for_verify(); |
| 342 | 965 Universe::verify(false); |
| 966 } | |
| 967 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); | |
| 968 | |
| 969 reset_gc_time_stamp(); | |
| 970 // Since everything potentially moved, we will clear all remembered | |
|
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971 // sets, and clear all cards. Later we will rebuild remebered |
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972 // sets. We will also reset the GC time stamps of the regions. |
| 342 | 973 PostMCRemSetClearClosure rs_clear(mr_bs()); |
| 974 heap_region_iterate(&rs_clear); | |
| 975 | |
| 976 // Resize the heap if necessary. | |
| 977 resize_if_necessary_after_full_collection(full ? 0 : word_size); | |
| 978 | |
| 979 if (_cg1r->use_cache()) { | |
| 980 _cg1r->clear_and_record_card_counts(); | |
| 981 _cg1r->clear_hot_cache(); | |
| 982 } | |
| 983 | |
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984 // Rebuild remembered sets of all regions. |
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985 if (ParallelGCThreads > 0) { |
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986 ParRebuildRSTask rebuild_rs_task(this); |
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987 assert(check_heap_region_claim_values( |
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988 HeapRegion::InitialClaimValue), "sanity check"); |
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989 set_par_threads(workers()->total_workers()); |
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990 workers()->run_task(&rebuild_rs_task); |
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991 set_par_threads(0); |
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992 assert(check_heap_region_claim_values( |
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993 HeapRegion::RebuildRSClaimValue), "sanity check"); |
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994 reset_heap_region_claim_values(); |
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995 } else { |
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996 RebuildRSOutOfRegionClosure rebuild_rs(this); |
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997 heap_region_iterate(&rebuild_rs); |
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998 } |
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999 |
| 342 | 1000 if (PrintGC) { |
| 1001 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
| 1002 } | |
| 1003 | |
| 1004 if (true) { // FIXME | |
| 1005 // Ask the permanent generation to adjust size for full collections | |
| 1006 perm()->compute_new_size(); | |
| 1007 } | |
| 1008 | |
| 1009 double end = os::elapsedTime(); | |
| 1010 GCOverheadReporter::recordSTWEnd(end); | |
| 1011 g1_policy()->record_full_collection_end(); | |
| 1012 | |
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1013 #ifdef TRACESPINNING |
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1014 ParallelTaskTerminator::print_termination_counts(); |
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1015 #endif |
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1016 |
| 342 | 1017 gc_epilogue(true); |
| 1018 | |
| 1019 // Abandon concurrent refinement. This must happen last: in the | |
| 1020 // dirty-card logging system, some cards may be dirty by weak-ref | |
| 1021 // processing, and may be enqueued. But the whole card table is | |
| 1022 // dirtied, so this should abandon those logs, and set "do_traversal" | |
| 1023 // to true. | |
| 1024 concurrent_g1_refine()->set_pya_restart(); | |
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1025 assert(!G1DeferredRSUpdate |
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1026 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
| 342 | 1027 assert(regions_accounted_for(), "Region leakage!"); |
| 1028 } | |
| 1029 | |
| 1030 if (g1_policy()->in_young_gc_mode()) { | |
| 1031 _young_list->reset_sampled_info(); | |
| 1032 assert( check_young_list_empty(false, false), | |
| 1033 "young list should be empty at this point"); | |
| 1034 } | |
| 1035 } | |
| 1036 | |
| 1037 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
| 1038 do_collection(true, clear_all_soft_refs, 0); | |
| 1039 } | |
| 1040 | |
| 1041 // This code is mostly copied from TenuredGeneration. | |
| 1042 void | |
| 1043 G1CollectedHeap:: | |
| 1044 resize_if_necessary_after_full_collection(size_t word_size) { | |
| 1045 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
| 1046 | |
| 1047 // Include the current allocation, if any, and bytes that will be | |
| 1048 // pre-allocated to support collections, as "used". | |
| 1049 const size_t used_after_gc = used(); | |
| 1050 const size_t capacity_after_gc = capacity(); | |
| 1051 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
| 1052 | |
| 1053 // We don't have floating point command-line arguments | |
| 1054 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100; | |
| 1055 const double maximum_used_percentage = 1.0 - minimum_free_percentage; | |
| 1056 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100; | |
| 1057 const double minimum_used_percentage = 1.0 - maximum_free_percentage; | |
| 1058 | |
| 1059 size_t minimum_desired_capacity = (size_t) (used_after_gc / maximum_used_percentage); | |
| 1060 size_t maximum_desired_capacity = (size_t) (used_after_gc / minimum_used_percentage); | |
| 1061 | |
| 1062 // Don't shrink less than the initial size. | |
| 1063 minimum_desired_capacity = | |
| 1064 MAX2(minimum_desired_capacity, | |
| 1065 collector_policy()->initial_heap_byte_size()); | |
| 1066 maximum_desired_capacity = | |
| 1067 MAX2(maximum_desired_capacity, | |
| 1068 collector_policy()->initial_heap_byte_size()); | |
| 1069 | |
| 1070 // We are failing here because minimum_desired_capacity is | |
| 1071 assert(used_after_gc <= minimum_desired_capacity, "sanity check"); | |
| 1072 assert(minimum_desired_capacity <= maximum_desired_capacity, "sanity check"); | |
| 1073 | |
| 1074 if (PrintGC && Verbose) { | |
| 1075 const double free_percentage = ((double)free_after_gc) / capacity(); | |
| 1076 gclog_or_tty->print_cr("Computing new size after full GC "); | |
| 1077 gclog_or_tty->print_cr(" " | |
| 1078 " minimum_free_percentage: %6.2f", | |
| 1079 minimum_free_percentage); | |
| 1080 gclog_or_tty->print_cr(" " | |
| 1081 " maximum_free_percentage: %6.2f", | |
| 1082 maximum_free_percentage); | |
| 1083 gclog_or_tty->print_cr(" " | |
| 1084 " capacity: %6.1fK" | |
| 1085 " minimum_desired_capacity: %6.1fK" | |
| 1086 " maximum_desired_capacity: %6.1fK", | |
| 1087 capacity() / (double) K, | |
| 1088 minimum_desired_capacity / (double) K, | |
| 1089 maximum_desired_capacity / (double) K); | |
| 1090 gclog_or_tty->print_cr(" " | |
| 1091 " free_after_gc : %6.1fK" | |
| 1092 " used_after_gc : %6.1fK", | |
| 1093 free_after_gc / (double) K, | |
| 1094 used_after_gc / (double) K); | |
| 1095 gclog_or_tty->print_cr(" " | |
| 1096 " free_percentage: %6.2f", | |
| 1097 free_percentage); | |
| 1098 } | |
| 1099 if (capacity() < minimum_desired_capacity) { | |
| 1100 // Don't expand unless it's significant | |
| 1101 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
| 1102 expand(expand_bytes); | |
| 1103 if (PrintGC && Verbose) { | |
| 1104 gclog_or_tty->print_cr(" expanding:" | |
| 1105 " minimum_desired_capacity: %6.1fK" | |
| 1106 " expand_bytes: %6.1fK", | |
| 1107 minimum_desired_capacity / (double) K, | |
| 1108 expand_bytes / (double) K); | |
| 1109 } | |
| 1110 | |
| 1111 // No expansion, now see if we want to shrink | |
| 1112 } else if (capacity() > maximum_desired_capacity) { | |
| 1113 // Capacity too large, compute shrinking size | |
| 1114 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
| 1115 shrink(shrink_bytes); | |
| 1116 if (PrintGC && Verbose) { | |
| 1117 gclog_or_tty->print_cr(" " | |
| 1118 " shrinking:" | |
| 1119 " initSize: %.1fK" | |
| 1120 " maximum_desired_capacity: %.1fK", | |
| 1121 collector_policy()->initial_heap_byte_size() / (double) K, | |
| 1122 maximum_desired_capacity / (double) K); | |
| 1123 gclog_or_tty->print_cr(" " | |
| 1124 " shrink_bytes: %.1fK", | |
| 1125 shrink_bytes / (double) K); | |
| 1126 } | |
| 1127 } | |
| 1128 } | |
| 1129 | |
| 1130 | |
| 1131 HeapWord* | |
| 1132 G1CollectedHeap::satisfy_failed_allocation(size_t word_size) { | |
| 1133 HeapWord* result = NULL; | |
| 1134 | |
| 1135 // In a G1 heap, we're supposed to keep allocation from failing by | |
| 1136 // incremental pauses. Therefore, at least for now, we'll favor | |
| 1137 // expansion over collection. (This might change in the future if we can | |
| 1138 // do something smarter than full collection to satisfy a failed alloc.) | |
| 1139 | |
| 1140 result = expand_and_allocate(word_size); | |
| 1141 if (result != NULL) { | |
| 1142 assert(is_in(result), "result not in heap"); | |
| 1143 return result; | |
| 1144 } | |
| 1145 | |
| 1146 // OK, I guess we have to try collection. | |
| 1147 | |
| 1148 do_collection(false, false, word_size); | |
| 1149 | |
| 1150 result = attempt_allocation(word_size, /*permit_collection_pause*/false); | |
| 1151 | |
| 1152 if (result != NULL) { | |
| 1153 assert(is_in(result), "result not in heap"); | |
| 1154 return result; | |
| 1155 } | |
| 1156 | |
| 1157 // Try collecting soft references. | |
| 1158 do_collection(false, true, word_size); | |
| 1159 result = attempt_allocation(word_size, /*permit_collection_pause*/false); | |
| 1160 if (result != NULL) { | |
| 1161 assert(is_in(result), "result not in heap"); | |
| 1162 return result; | |
| 1163 } | |
| 1164 | |
| 1165 // What else? We might try synchronous finalization later. If the total | |
| 1166 // space available is large enough for the allocation, then a more | |
| 1167 // complete compaction phase than we've tried so far might be | |
| 1168 // appropriate. | |
| 1169 return NULL; | |
| 1170 } | |
| 1171 | |
| 1172 // Attempting to expand the heap sufficiently | |
| 1173 // to support an allocation of the given "word_size". If | |
| 1174 // successful, perform the allocation and return the address of the | |
| 1175 // allocated block, or else "NULL". | |
| 1176 | |
| 1177 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
| 1178 size_t expand_bytes = word_size * HeapWordSize; | |
| 1179 if (expand_bytes < MinHeapDeltaBytes) { | |
| 1180 expand_bytes = MinHeapDeltaBytes; | |
| 1181 } | |
| 1182 expand(expand_bytes); | |
| 1183 assert(regions_accounted_for(), "Region leakage!"); | |
| 1184 HeapWord* result = attempt_allocation(word_size, false /* permit_collection_pause */); | |
| 1185 return result; | |
| 1186 } | |
| 1187 | |
| 1188 size_t G1CollectedHeap::free_region_if_totally_empty(HeapRegion* hr) { | |
| 1189 size_t pre_used = 0; | |
| 1190 size_t cleared_h_regions = 0; | |
| 1191 size_t freed_regions = 0; | |
| 1192 UncleanRegionList local_list; | |
| 1193 free_region_if_totally_empty_work(hr, pre_used, cleared_h_regions, | |
| 1194 freed_regions, &local_list); | |
| 1195 | |
| 1196 finish_free_region_work(pre_used, cleared_h_regions, freed_regions, | |
| 1197 &local_list); | |
| 1198 return pre_used; | |
| 1199 } | |
| 1200 | |
| 1201 void | |
| 1202 G1CollectedHeap::free_region_if_totally_empty_work(HeapRegion* hr, | |
| 1203 size_t& pre_used, | |
| 1204 size_t& cleared_h, | |
| 1205 size_t& freed_regions, | |
| 1206 UncleanRegionList* list, | |
| 1207 bool par) { | |
| 1208 assert(!hr->continuesHumongous(), "should have filtered these out"); | |
| 1209 size_t res = 0; | |
| 1210 if (!hr->popular() && hr->used() > 0 && hr->garbage_bytes() == hr->used()) { | |
| 1211 if (!hr->is_young()) { | |
| 1212 if (G1PolicyVerbose > 0) | |
| 1213 gclog_or_tty->print_cr("Freeing empty region "PTR_FORMAT "(" SIZE_FORMAT " bytes)" | |
| 1214 " during cleanup", hr, hr->used()); | |
| 1215 free_region_work(hr, pre_used, cleared_h, freed_regions, list, par); | |
| 1216 } | |
| 1217 } | |
| 1218 } | |
| 1219 | |
| 1220 // FIXME: both this and shrink could probably be more efficient by | |
| 1221 // doing one "VirtualSpace::expand_by" call rather than several. | |
| 1222 void G1CollectedHeap::expand(size_t expand_bytes) { | |
| 1223 size_t old_mem_size = _g1_storage.committed_size(); | |
| 1224 // We expand by a minimum of 1K. | |
| 1225 expand_bytes = MAX2(expand_bytes, (size_t)K); | |
| 1226 size_t aligned_expand_bytes = | |
| 1227 ReservedSpace::page_align_size_up(expand_bytes); | |
| 1228 aligned_expand_bytes = align_size_up(aligned_expand_bytes, | |
| 1229 HeapRegion::GrainBytes); | |
| 1230 expand_bytes = aligned_expand_bytes; | |
| 1231 while (expand_bytes > 0) { | |
| 1232 HeapWord* base = (HeapWord*)_g1_storage.high(); | |
| 1233 // Commit more storage. | |
| 1234 bool successful = _g1_storage.expand_by(HeapRegion::GrainBytes); | |
| 1235 if (!successful) { | |
| 1236 expand_bytes = 0; | |
| 1237 } else { | |
| 1238 expand_bytes -= HeapRegion::GrainBytes; | |
| 1239 // Expand the committed region. | |
| 1240 HeapWord* high = (HeapWord*) _g1_storage.high(); | |
| 1241 _g1_committed.set_end(high); | |
| 1242 // Create a new HeapRegion. | |
| 1243 MemRegion mr(base, high); | |
| 1244 bool is_zeroed = !_g1_max_committed.contains(base); | |
| 1245 HeapRegion* hr = new HeapRegion(_bot_shared, mr, is_zeroed); | |
| 1246 | |
| 1247 // Now update max_committed if necessary. | |
| 1248 _g1_max_committed.set_end(MAX2(_g1_max_committed.end(), high)); | |
| 1249 | |
| 1250 // Add it to the HeapRegionSeq. | |
| 1251 _hrs->insert(hr); | |
| 1252 // Set the zero-fill state, according to whether it's already | |
| 1253 // zeroed. | |
| 1254 { | |
| 1255 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 1256 if (is_zeroed) { | |
| 1257 hr->set_zero_fill_complete(); | |
| 1258 put_free_region_on_list_locked(hr); | |
| 1259 } else { | |
| 1260 hr->set_zero_fill_needed(); | |
| 1261 put_region_on_unclean_list_locked(hr); | |
| 1262 } | |
| 1263 } | |
| 1264 _free_regions++; | |
| 1265 // And we used up an expansion region to create it. | |
| 1266 _expansion_regions--; | |
| 1267 // Tell the cardtable about it. | |
| 1268 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
| 1269 // And the offset table as well. | |
| 1270 _bot_shared->resize(_g1_committed.word_size()); | |
| 1271 } | |
| 1272 } | |
| 1273 if (Verbose && PrintGC) { | |
| 1274 size_t new_mem_size = _g1_storage.committed_size(); | |
| 1275 gclog_or_tty->print_cr("Expanding garbage-first heap from %ldK by %ldK to %ldK", | |
| 1276 old_mem_size/K, aligned_expand_bytes/K, | |
| 1277 new_mem_size/K); | |
| 1278 } | |
| 1279 } | |
| 1280 | |
| 1281 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) | |
| 1282 { | |
| 1283 size_t old_mem_size = _g1_storage.committed_size(); | |
| 1284 size_t aligned_shrink_bytes = | |
| 1285 ReservedSpace::page_align_size_down(shrink_bytes); | |
| 1286 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
| 1287 HeapRegion::GrainBytes); | |
| 1288 size_t num_regions_deleted = 0; | |
| 1289 MemRegion mr = _hrs->shrink_by(aligned_shrink_bytes, num_regions_deleted); | |
| 1290 | |
| 1291 assert(mr.end() == (HeapWord*)_g1_storage.high(), "Bad shrink!"); | |
| 1292 if (mr.byte_size() > 0) | |
| 1293 _g1_storage.shrink_by(mr.byte_size()); | |
| 1294 assert(mr.start() == (HeapWord*)_g1_storage.high(), "Bad shrink!"); | |
| 1295 | |
| 1296 _g1_committed.set_end(mr.start()); | |
| 1297 _free_regions -= num_regions_deleted; | |
| 1298 _expansion_regions += num_regions_deleted; | |
| 1299 | |
| 1300 // Tell the cardtable about it. | |
| 1301 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
| 1302 | |
| 1303 // And the offset table as well. | |
| 1304 _bot_shared->resize(_g1_committed.word_size()); | |
| 1305 | |
| 1306 HeapRegionRemSet::shrink_heap(n_regions()); | |
| 1307 | |
| 1308 if (Verbose && PrintGC) { | |
| 1309 size_t new_mem_size = _g1_storage.committed_size(); | |
| 1310 gclog_or_tty->print_cr("Shrinking garbage-first heap from %ldK by %ldK to %ldK", | |
| 1311 old_mem_size/K, aligned_shrink_bytes/K, | |
| 1312 new_mem_size/K); | |
| 1313 } | |
| 1314 } | |
| 1315 | |
| 1316 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
| 636 | 1317 release_gc_alloc_regions(true /* totally */); |
| 342 | 1318 tear_down_region_lists(); // We will rebuild them in a moment. |
| 1319 shrink_helper(shrink_bytes); | |
| 1320 rebuild_region_lists(); | |
| 1321 } | |
| 1322 | |
| 1323 // Public methods. | |
| 1324 | |
| 1325 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 1326 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 1327 #endif // _MSC_VER | |
| 1328 | |
| 1329 | |
| 1330 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
| 1331 SharedHeap(policy_), | |
| 1332 _g1_policy(policy_), | |
| 1333 _ref_processor(NULL), | |
| 1334 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), | |
| 1335 _bot_shared(NULL), | |
| 1336 _par_alloc_during_gc_lock(Mutex::leaf, "par alloc during GC lock"), | |
| 1337 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
| 1338 _evac_failure_scan_stack(NULL) , | |
| 1339 _mark_in_progress(false), | |
| 1340 _cg1r(NULL), _czft(NULL), _summary_bytes_used(0), | |
| 1341 _cur_alloc_region(NULL), | |
| 1342 _refine_cte_cl(NULL), | |
| 1343 _free_region_list(NULL), _free_region_list_size(0), | |
| 1344 _free_regions(0), | |
| 1345 _popular_object_boundary(NULL), | |
| 1346 _cur_pop_hr_index(0), | |
| 1347 _popular_regions_to_be_evacuated(NULL), | |
| 1348 _pop_obj_rc_at_copy(), | |
| 1349 _full_collection(false), | |
| 1350 _unclean_region_list(), | |
| 1351 _unclean_regions_coming(false), | |
| 1352 _young_list(new YoungList(this)), | |
| 1353 _gc_time_stamp(0), | |
| 526 | 1354 _surviving_young_words(NULL), |
| 1355 _in_cset_fast_test(NULL), | |
| 636 | 1356 _in_cset_fast_test_base(NULL) { |
| 342 | 1357 _g1h = this; // To catch bugs. |
| 1358 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
| 1359 vm_exit_during_initialization("Failed necessary allocation."); | |
| 1360 } | |
| 1361 int n_queues = MAX2((int)ParallelGCThreads, 1); | |
| 1362 _task_queues = new RefToScanQueueSet(n_queues); | |
| 1363 | |
| 1364 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
| 1365 assert(n_rem_sets > 0, "Invariant."); | |
| 1366 | |
| 1367 HeapRegionRemSetIterator** iter_arr = | |
| 1368 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
| 1369 for (int i = 0; i < n_queues; i++) { | |
| 1370 iter_arr[i] = new HeapRegionRemSetIterator(); | |
| 1371 } | |
| 1372 _rem_set_iterator = iter_arr; | |
| 1373 | |
| 1374 for (int i = 0; i < n_queues; i++) { | |
| 1375 RefToScanQueue* q = new RefToScanQueue(); | |
| 1376 q->initialize(); | |
| 1377 _task_queues->register_queue(i, q); | |
| 1378 } | |
| 1379 | |
| 1380 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 636 | 1381 _gc_alloc_regions[ap] = NULL; |
| 1382 _gc_alloc_region_counts[ap] = 0; | |
| 1383 _retained_gc_alloc_regions[ap] = NULL; | |
| 1384 // by default, we do not retain a GC alloc region for each ap; | |
| 1385 // we'll override this, when appropriate, below | |
| 1386 _retain_gc_alloc_region[ap] = false; | |
| 1387 } | |
| 1388 | |
| 1389 // We will try to remember the last half-full tenured region we | |
| 1390 // allocated to at the end of a collection so that we can re-use it | |
| 1391 // during the next collection. | |
| 1392 _retain_gc_alloc_region[GCAllocForTenured] = true; | |
| 1393 | |
| 342 | 1394 guarantee(_task_queues != NULL, "task_queues allocation failure."); |
| 1395 } | |
| 1396 | |
| 1397 jint G1CollectedHeap::initialize() { | |
| 1398 os::enable_vtime(); | |
| 1399 | |
| 1400 // Necessary to satisfy locking discipline assertions. | |
| 1401 | |
| 1402 MutexLocker x(Heap_lock); | |
| 1403 | |
| 1404 // While there are no constraints in the GC code that HeapWordSize | |
| 1405 // be any particular value, there are multiple other areas in the | |
| 1406 // system which believe this to be true (e.g. oop->object_size in some | |
| 1407 // cases incorrectly returns the size in wordSize units rather than | |
| 1408 // HeapWordSize). | |
| 1409 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
| 1410 | |
| 1411 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
| 1412 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
| 1413 | |
| 1414 // Ensure that the sizes are properly aligned. | |
| 1415 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1416 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1417 | |
| 1418 // We allocate this in any case, but only do no work if the command line | |
| 1419 // param is off. | |
| 1420 _cg1r = new ConcurrentG1Refine(); | |
| 1421 | |
| 1422 // Reserve the maximum. | |
| 1423 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
| 1424 // Includes the perm-gen. | |
|
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1425 |
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1426 const size_t total_reserved = max_byte_size + pgs->max_size(); |
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1427 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1428 |
| 342 | 1429 ReservedSpace heap_rs(max_byte_size + pgs->max_size(), |
| 1430 HeapRegion::GrainBytes, | |
|
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1431 false /*ism*/, addr); |
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1432 |
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1433 if (UseCompressedOops) { |
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1434 if (addr != NULL && !heap_rs.is_reserved()) { |
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1435 // Failed to reserve at specified address - the requested memory |
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1436 // region is taken already, for example, by 'java' launcher. |
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1437 // Try again to reserver heap higher. |
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1438 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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1439 ReservedSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1440 false /*ism*/, addr); |
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1441 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1442 // Failed to reserve at specified address again - give up. |
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1443 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1444 assert(addr == NULL, ""); |
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1445 ReservedSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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1446 false /*ism*/, addr); |
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1447 heap_rs = heap_rs1; |
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1448 } else { |
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1449 heap_rs = heap_rs0; |
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1450 } |
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1451 } |
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1452 } |
| 342 | 1453 |
| 1454 if (!heap_rs.is_reserved()) { | |
| 1455 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
| 1456 return JNI_ENOMEM; | |
| 1457 } | |
| 1458 | |
| 1459 // It is important to do this in a way such that concurrent readers can't | |
| 1460 // temporarily think somethings in the heap. (I've actually seen this | |
| 1461 // happen in asserts: DLD.) | |
| 1462 _reserved.set_word_size(0); | |
| 1463 _reserved.set_start((HeapWord*)heap_rs.base()); | |
| 1464 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 1465 | |
| 1466 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
| 1467 | |
| 1468 _num_humongous_regions = 0; | |
| 1469 | |
| 1470 // Create the gen rem set (and barrier set) for the entire reserved region. | |
| 1471 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
| 1472 set_barrier_set(rem_set()->bs()); | |
| 1473 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
| 1474 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
| 1475 } else { | |
| 1476 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
| 1477 return JNI_ENOMEM; | |
| 1478 } | |
| 1479 | |
| 1480 // Also create a G1 rem set. | |
| 1481 if (G1UseHRIntoRS) { | |
| 1482 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { | |
| 1483 _g1_rem_set = new HRInto_G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
| 1484 } else { | |
| 1485 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); | |
| 1486 return JNI_ENOMEM; | |
| 1487 } | |
| 1488 } else { | |
| 1489 _g1_rem_set = new StupidG1RemSet(this); | |
| 1490 } | |
| 1491 | |
| 1492 // Carve out the G1 part of the heap. | |
| 1493 | |
| 1494 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
| 1495 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
| 1496 g1_rs.size()/HeapWordSize); | |
| 1497 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
| 1498 | |
| 1499 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
| 1500 | |
| 1501 _g1_storage.initialize(g1_rs, 0); | |
| 1502 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
| 1503 _g1_max_committed = _g1_committed; | |
| 393 | 1504 _hrs = new HeapRegionSeq(_expansion_regions); |
| 342 | 1505 guarantee(_hrs != NULL, "Couldn't allocate HeapRegionSeq"); |
| 1506 guarantee(_cur_alloc_region == NULL, "from constructor"); | |
| 1507 | |
| 1508 _bot_shared = new G1BlockOffsetSharedArray(_reserved, | |
| 1509 heap_word_size(init_byte_size)); | |
| 1510 | |
| 1511 _g1h = this; | |
| 1512 | |
| 1513 // Create the ConcurrentMark data structure and thread. | |
| 1514 // (Must do this late, so that "max_regions" is defined.) | |
| 1515 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
| 1516 _cmThread = _cm->cmThread(); | |
| 1517 | |
| 1518 // ...and the concurrent zero-fill thread, if necessary. | |
| 1519 if (G1ConcZeroFill) { | |
| 1520 _czft = new ConcurrentZFThread(); | |
| 1521 } | |
| 1522 | |
| 1523 | |
| 1524 | |
| 1525 // Allocate the popular regions; take them off free lists. | |
| 1526 size_t pop_byte_size = G1NumPopularRegions * HeapRegion::GrainBytes; | |
| 1527 expand(pop_byte_size); | |
| 1528 _popular_object_boundary = | |
| 1529 _g1_reserved.start() + (G1NumPopularRegions * HeapRegion::GrainWords); | |
| 1530 for (int i = 0; i < G1NumPopularRegions; i++) { | |
| 1531 HeapRegion* hr = newAllocRegion(HeapRegion::GrainWords); | |
| 1532 // assert(hr != NULL && hr->bottom() < _popular_object_boundary, | |
| 1533 // "Should be enough, and all should be below boundary."); | |
| 1534 hr->set_popular(true); | |
| 1535 } | |
| 1536 assert(_cur_pop_hr_index == 0, "Start allocating at the first region."); | |
| 1537 | |
| 1538 // Initialize the from_card cache structure of HeapRegionRemSet. | |
| 1539 HeapRegionRemSet::init_heap(max_regions()); | |
| 1540 | |
| 1541 // Now expand into the rest of the initial heap size. | |
| 1542 expand(init_byte_size - pop_byte_size); | |
| 1543 | |
| 1544 // Perform any initialization actions delegated to the policy. | |
| 1545 g1_policy()->init(); | |
| 1546 | |
| 1547 g1_policy()->note_start_of_mark_thread(); | |
| 1548 | |
| 1549 _refine_cte_cl = | |
| 1550 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
| 1551 g1_rem_set(), | |
| 1552 concurrent_g1_refine()); | |
| 1553 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 1554 | |
| 1555 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
| 1556 SATB_Q_FL_lock, | |
| 1557 0, | |
| 1558 Shared_SATB_Q_lock); | |
| 1559 if (G1RSBarrierUseQueue) { | |
| 1560 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
| 1561 DirtyCardQ_FL_lock, | |
| 1562 G1DirtyCardQueueMax, | |
| 1563 Shared_DirtyCardQ_lock); | |
| 1564 } | |
|
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1565 if (G1DeferredRSUpdate) { |
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1566 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
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1567 DirtyCardQ_FL_lock, |
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1568 0, |
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1569 Shared_DirtyCardQ_lock, |
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1570 &JavaThread::dirty_card_queue_set()); |
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1571 } |
| 342 | 1572 // In case we're keeping closure specialization stats, initialize those |
| 1573 // counts and that mechanism. | |
| 1574 SpecializationStats::clear(); | |
| 1575 | |
| 1576 _gc_alloc_region_list = NULL; | |
| 1577 | |
| 1578 // Do later initialization work for concurrent refinement. | |
| 1579 _cg1r->init(); | |
| 1580 | |
| 1581 const char* group_names[] = { "CR", "ZF", "CM", "CL" }; | |
| 1582 GCOverheadReporter::initGCOverheadReporter(4, group_names); | |
| 1583 | |
| 1584 return JNI_OK; | |
| 1585 } | |
| 1586 | |
| 1587 void G1CollectedHeap::ref_processing_init() { | |
| 1588 SharedHeap::ref_processing_init(); | |
| 1589 MemRegion mr = reserved_region(); | |
| 1590 _ref_processor = ReferenceProcessor::create_ref_processor( | |
| 1591 mr, // span | |
| 1592 false, // Reference discovery is not atomic | |
| 1593 // (though it shouldn't matter here.) | |
| 1594 true, // mt_discovery | |
| 1595 NULL, // is alive closure: need to fill this in for efficiency | |
| 1596 ParallelGCThreads, | |
| 1597 ParallelRefProcEnabled, | |
| 1598 true); // Setting next fields of discovered | |
| 1599 // lists requires a barrier. | |
| 1600 } | |
| 1601 | |
| 1602 size_t G1CollectedHeap::capacity() const { | |
| 1603 return _g1_committed.byte_size(); | |
| 1604 } | |
| 1605 | |
| 1606 void G1CollectedHeap::iterate_dirty_card_closure(bool concurrent, | |
| 1607 int worker_i) { | |
| 1608 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 1609 int n_completed_buffers = 0; | |
| 1610 while (dcqs.apply_closure_to_completed_buffer(worker_i, 0, true)) { | |
| 1611 n_completed_buffers++; | |
| 1612 } | |
| 1613 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
| 1614 (double) n_completed_buffers); | |
| 1615 dcqs.clear_n_completed_buffers(); | |
| 1616 // Finish up the queue... | |
| 1617 if (worker_i == 0) concurrent_g1_refine()->clean_up_cache(worker_i, | |
| 1618 g1_rem_set()); | |
| 1619 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
| 1620 } | |
| 1621 | |
| 1622 | |
| 1623 // Computes the sum of the storage used by the various regions. | |
| 1624 | |
| 1625 size_t G1CollectedHeap::used() const { | |
| 1626 assert(Heap_lock->owner() != NULL, | |
| 1627 "Should be owned on this thread's behalf."); | |
| 1628 size_t result = _summary_bytes_used; | |
| 1629 if (_cur_alloc_region != NULL) | |
| 1630 result += _cur_alloc_region->used(); | |
| 1631 return result; | |
| 1632 } | |
| 1633 | |
| 1634 class SumUsedClosure: public HeapRegionClosure { | |
| 1635 size_t _used; | |
| 1636 public: | |
| 1637 SumUsedClosure() : _used(0) {} | |
| 1638 bool doHeapRegion(HeapRegion* r) { | |
| 1639 if (!r->continuesHumongous()) { | |
| 1640 _used += r->used(); | |
| 1641 } | |
| 1642 return false; | |
| 1643 } | |
| 1644 size_t result() { return _used; } | |
| 1645 }; | |
| 1646 | |
| 1647 size_t G1CollectedHeap::recalculate_used() const { | |
| 1648 SumUsedClosure blk; | |
| 1649 _hrs->iterate(&blk); | |
| 1650 return blk.result(); | |
| 1651 } | |
| 1652 | |
| 1653 #ifndef PRODUCT | |
| 1654 class SumUsedRegionsClosure: public HeapRegionClosure { | |
| 1655 size_t _num; | |
| 1656 public: | |
| 1657 // _num is set to 1 to account for the popular region | |
| 1658 SumUsedRegionsClosure() : _num(G1NumPopularRegions) {} | |
| 1659 bool doHeapRegion(HeapRegion* r) { | |
| 1660 if (r->continuesHumongous() || r->used() > 0 || r->is_gc_alloc_region()) { | |
| 1661 _num += 1; | |
| 1662 } | |
| 1663 return false; | |
| 1664 } | |
| 1665 size_t result() { return _num; } | |
| 1666 }; | |
| 1667 | |
| 1668 size_t G1CollectedHeap::recalculate_used_regions() const { | |
| 1669 SumUsedRegionsClosure blk; | |
| 1670 _hrs->iterate(&blk); | |
| 1671 return blk.result(); | |
| 1672 } | |
| 1673 #endif // PRODUCT | |
| 1674 | |
| 1675 size_t G1CollectedHeap::unsafe_max_alloc() { | |
| 1676 if (_free_regions > 0) return HeapRegion::GrainBytes; | |
| 1677 // otherwise, is there space in the current allocation region? | |
| 1678 | |
| 1679 // We need to store the current allocation region in a local variable | |
| 1680 // here. The problem is that this method doesn't take any locks and | |
| 1681 // there may be other threads which overwrite the current allocation | |
| 1682 // region field. attempt_allocation(), for example, sets it to NULL | |
| 1683 // and this can happen *after* the NULL check here but before the call | |
| 1684 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
| 1685 // to be a problem in the optimized build, since the two loads of the | |
| 1686 // current allocation region field are optimized away. | |
| 1687 HeapRegion* car = _cur_alloc_region; | |
| 1688 | |
| 1689 // FIXME: should iterate over all regions? | |
| 1690 if (car == NULL) { | |
| 1691 return 0; | |
| 1692 } | |
| 1693 return car->free(); | |
| 1694 } | |
| 1695 | |
| 1696 void G1CollectedHeap::collect(GCCause::Cause cause) { | |
| 1697 // The caller doesn't have the Heap_lock | |
| 1698 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
| 1699 MutexLocker ml(Heap_lock); | |
| 1700 collect_locked(cause); | |
| 1701 } | |
| 1702 | |
| 1703 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { | |
| 1704 assert(Thread::current()->is_VM_thread(), "Precondition#1"); | |
| 1705 assert(Heap_lock->is_locked(), "Precondition#2"); | |
| 1706 GCCauseSetter gcs(this, cause); | |
| 1707 switch (cause) { | |
| 1708 case GCCause::_heap_inspection: | |
| 1709 case GCCause::_heap_dump: { | |
| 1710 HandleMark hm; | |
| 1711 do_full_collection(false); // don't clear all soft refs | |
| 1712 break; | |
| 1713 } | |
| 1714 default: // XXX FIX ME | |
| 1715 ShouldNotReachHere(); // Unexpected use of this function | |
| 1716 } | |
| 1717 } | |
| 1718 | |
| 1719 | |
| 1720 void G1CollectedHeap::collect_locked(GCCause::Cause cause) { | |
| 1721 // Don't want to do a GC until cleanup is completed. | |
| 1722 wait_for_cleanup_complete(); | |
| 1723 | |
| 1724 // Read the GC count while holding the Heap_lock | |
| 1725 int gc_count_before = SharedHeap::heap()->total_collections(); | |
| 1726 { | |
| 1727 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
| 1728 VM_G1CollectFull op(gc_count_before, cause); | |
| 1729 VMThread::execute(&op); | |
| 1730 } | |
| 1731 } | |
| 1732 | |
| 1733 bool G1CollectedHeap::is_in(const void* p) const { | |
| 1734 if (_g1_committed.contains(p)) { | |
| 1735 HeapRegion* hr = _hrs->addr_to_region(p); | |
| 1736 return hr->is_in(p); | |
| 1737 } else { | |
| 1738 return _perm_gen->as_gen()->is_in(p); | |
| 1739 } | |
| 1740 } | |
| 1741 | |
| 1742 // Iteration functions. | |
| 1743 | |
| 1744 // Iterates an OopClosure over all ref-containing fields of objects | |
| 1745 // within a HeapRegion. | |
| 1746 | |
| 1747 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
| 1748 MemRegion _mr; | |
| 1749 OopClosure* _cl; | |
| 1750 public: | |
| 1751 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
| 1752 : _mr(mr), _cl(cl) {} | |
| 1753 bool doHeapRegion(HeapRegion* r) { | |
| 1754 if (! r->continuesHumongous()) { | |
| 1755 r->oop_iterate(_cl); | |
| 1756 } | |
| 1757 return false; | |
| 1758 } | |
| 1759 }; | |
| 1760 | |
| 1761 void G1CollectedHeap::oop_iterate(OopClosure* cl) { | |
| 1762 IterateOopClosureRegionClosure blk(_g1_committed, cl); | |
| 1763 _hrs->iterate(&blk); | |
| 1764 } | |
| 1765 | |
| 1766 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl) { | |
| 1767 IterateOopClosureRegionClosure blk(mr, cl); | |
| 1768 _hrs->iterate(&blk); | |
| 1769 } | |
| 1770 | |
| 1771 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
| 1772 | |
| 1773 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
| 1774 ObjectClosure* _cl; | |
| 1775 public: | |
| 1776 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
| 1777 bool doHeapRegion(HeapRegion* r) { | |
| 1778 if (! r->continuesHumongous()) { | |
| 1779 r->object_iterate(_cl); | |
| 1780 } | |
| 1781 return false; | |
| 1782 } | |
| 1783 }; | |
| 1784 | |
| 1785 void G1CollectedHeap::object_iterate(ObjectClosure* cl) { | |
| 1786 IterateObjectClosureRegionClosure blk(cl); | |
| 1787 _hrs->iterate(&blk); | |
| 1788 } | |
| 1789 | |
| 1790 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
| 1791 // FIXME: is this right? | |
| 1792 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
| 1793 } | |
| 1794 | |
| 1795 // Calls a SpaceClosure on a HeapRegion. | |
| 1796 | |
| 1797 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
| 1798 SpaceClosure* _cl; | |
| 1799 public: | |
| 1800 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
| 1801 bool doHeapRegion(HeapRegion* r) { | |
| 1802 _cl->do_space(r); | |
| 1803 return false; | |
| 1804 } | |
| 1805 }; | |
| 1806 | |
| 1807 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
| 1808 SpaceClosureRegionClosure blk(cl); | |
| 1809 _hrs->iterate(&blk); | |
| 1810 } | |
| 1811 | |
| 1812 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) { | |
| 1813 _hrs->iterate(cl); | |
| 1814 } | |
| 1815 | |
| 1816 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
| 1817 HeapRegionClosure* cl) { | |
| 1818 _hrs->iterate_from(r, cl); | |
| 1819 } | |
| 1820 | |
| 1821 void | |
| 1822 G1CollectedHeap::heap_region_iterate_from(int idx, HeapRegionClosure* cl) { | |
| 1823 _hrs->iterate_from(idx, cl); | |
| 1824 } | |
| 1825 | |
| 1826 HeapRegion* G1CollectedHeap::region_at(size_t idx) { return _hrs->at(idx); } | |
| 1827 | |
| 1828 void | |
| 1829 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
| 1830 int worker, | |
| 1831 jint claim_value) { | |
| 355 | 1832 const size_t regions = n_regions(); |
| 1833 const size_t worker_num = (ParallelGCThreads > 0 ? ParallelGCThreads : 1); | |
| 1834 // try to spread out the starting points of the workers | |
| 1835 const size_t start_index = regions / worker_num * (size_t) worker; | |
| 1836 | |
| 1837 // each worker will actually look at all regions | |
| 1838 for (size_t count = 0; count < regions; ++count) { | |
| 1839 const size_t index = (start_index + count) % regions; | |
| 1840 assert(0 <= index && index < regions, "sanity"); | |
| 1841 HeapRegion* r = region_at(index); | |
| 1842 // we'll ignore "continues humongous" regions (we'll process them | |
| 1843 // when we come across their corresponding "start humongous" | |
| 1844 // region) and regions already claimed | |
| 1845 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
| 1846 continue; | |
| 1847 } | |
| 1848 // OK, try to claim it | |
| 342 | 1849 if (r->claimHeapRegion(claim_value)) { |
| 355 | 1850 // success! |
| 1851 assert(!r->continuesHumongous(), "sanity"); | |
| 1852 if (r->startsHumongous()) { | |
| 1853 // If the region is "starts humongous" we'll iterate over its | |
| 1854 // "continues humongous" first; in fact we'll do them | |
| 1855 // first. The order is important. In on case, calling the | |
| 1856 // closure on the "starts humongous" region might de-allocate | |
| 1857 // and clear all its "continues humongous" regions and, as a | |
| 1858 // result, we might end up processing them twice. So, we'll do | |
| 1859 // them first (notice: most closures will ignore them anyway) and | |
| 1860 // then we'll do the "starts humongous" region. | |
| 1861 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
| 1862 HeapRegion* chr = region_at(ch_index); | |
| 1863 | |
| 1864 // if the region has already been claimed or it's not | |
| 1865 // "continues humongous" we're done | |
| 1866 if (chr->claim_value() == claim_value || | |
| 1867 !chr->continuesHumongous()) { | |
| 1868 break; | |
| 1869 } | |
| 1870 | |
| 1871 // Noone should have claimed it directly. We can given | |
| 1872 // that we claimed its "starts humongous" region. | |
| 1873 assert(chr->claim_value() != claim_value, "sanity"); | |
| 1874 assert(chr->humongous_start_region() == r, "sanity"); | |
| 1875 | |
| 1876 if (chr->claimHeapRegion(claim_value)) { | |
| 1877 // we should always be able to claim it; noone else should | |
| 1878 // be trying to claim this region | |
| 1879 | |
| 1880 bool res2 = cl->doHeapRegion(chr); | |
| 1881 assert(!res2, "Should not abort"); | |
| 1882 | |
| 1883 // Right now, this holds (i.e., no closure that actually | |
| 1884 // does something with "continues humongous" regions | |
| 1885 // clears them). We might have to weaken it in the future, | |
| 1886 // but let's leave these two asserts here for extra safety. | |
| 1887 assert(chr->continuesHumongous(), "should still be the case"); | |
| 1888 assert(chr->humongous_start_region() == r, "sanity"); | |
| 1889 } else { | |
| 1890 guarantee(false, "we should not reach here"); | |
| 1891 } | |
| 1892 } | |
| 1893 } | |
| 1894 | |
| 1895 assert(!r->continuesHumongous(), "sanity"); | |
| 1896 bool res = cl->doHeapRegion(r); | |
| 1897 assert(!res, "Should not abort"); | |
| 1898 } | |
| 1899 } | |
| 1900 } | |
| 1901 | |
| 390 | 1902 class ResetClaimValuesClosure: public HeapRegionClosure { |
| 1903 public: | |
| 1904 bool doHeapRegion(HeapRegion* r) { | |
| 1905 r->set_claim_value(HeapRegion::InitialClaimValue); | |
| 1906 return false; | |
| 1907 } | |
| 1908 }; | |
| 1909 | |
| 1910 void | |
| 1911 G1CollectedHeap::reset_heap_region_claim_values() { | |
| 1912 ResetClaimValuesClosure blk; | |
| 1913 heap_region_iterate(&blk); | |
| 1914 } | |
| 1915 | |
| 355 | 1916 #ifdef ASSERT |
| 1917 // This checks whether all regions in the heap have the correct claim | |
| 1918 // value. I also piggy-backed on this a check to ensure that the | |
| 1919 // humongous_start_region() information on "continues humongous" | |
| 1920 // regions is correct. | |
| 1921 | |
| 1922 class CheckClaimValuesClosure : public HeapRegionClosure { | |
| 1923 private: | |
| 1924 jint _claim_value; | |
| 1925 size_t _failures; | |
| 1926 HeapRegion* _sh_region; | |
| 1927 public: | |
| 1928 CheckClaimValuesClosure(jint claim_value) : | |
| 1929 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
| 1930 bool doHeapRegion(HeapRegion* r) { | |
| 1931 if (r->claim_value() != _claim_value) { | |
| 1932 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
| 1933 "claim value = %d, should be %d", | |
| 1934 r->bottom(), r->end(), r->claim_value(), | |
| 1935 _claim_value); | |
| 1936 ++_failures; | |
| 1937 } | |
| 1938 if (!r->isHumongous()) { | |
| 1939 _sh_region = NULL; | |
| 1940 } else if (r->startsHumongous()) { | |
| 1941 _sh_region = r; | |
| 1942 } else if (r->continuesHumongous()) { | |
| 1943 if (r->humongous_start_region() != _sh_region) { | |
| 1944 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
| 1945 "HS = "PTR_FORMAT", should be "PTR_FORMAT, | |
| 1946 r->bottom(), r->end(), | |
| 1947 r->humongous_start_region(), | |
| 1948 _sh_region); | |
| 1949 ++_failures; | |
| 342 | 1950 } |
| 1951 } | |
| 355 | 1952 return false; |
| 1953 } | |
| 1954 size_t failures() { | |
| 1955 return _failures; | |
| 1956 } | |
| 1957 }; | |
| 1958 | |
| 1959 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
| 1960 CheckClaimValuesClosure cl(claim_value); | |
| 1961 heap_region_iterate(&cl); | |
| 1962 return cl.failures() == 0; | |
| 1963 } | |
| 1964 #endif // ASSERT | |
| 342 | 1965 |
| 1966 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { | |
| 1967 HeapRegion* r = g1_policy()->collection_set(); | |
| 1968 while (r != NULL) { | |
| 1969 HeapRegion* next = r->next_in_collection_set(); | |
| 1970 if (cl->doHeapRegion(r)) { | |
| 1971 cl->incomplete(); | |
| 1972 return; | |
| 1973 } | |
| 1974 r = next; | |
| 1975 } | |
| 1976 } | |
| 1977 | |
| 1978 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
| 1979 HeapRegionClosure *cl) { | |
| 1980 assert(r->in_collection_set(), | |
| 1981 "Start region must be a member of the collection set."); | |
| 1982 HeapRegion* cur = r; | |
| 1983 while (cur != NULL) { | |
| 1984 HeapRegion* next = cur->next_in_collection_set(); | |
| 1985 if (cl->doHeapRegion(cur) && false) { | |
| 1986 cl->incomplete(); | |
| 1987 return; | |
| 1988 } | |
| 1989 cur = next; | |
| 1990 } | |
| 1991 cur = g1_policy()->collection_set(); | |
| 1992 while (cur != r) { | |
| 1993 HeapRegion* next = cur->next_in_collection_set(); | |
| 1994 if (cl->doHeapRegion(cur) && false) { | |
| 1995 cl->incomplete(); | |
| 1996 return; | |
| 1997 } | |
| 1998 cur = next; | |
| 1999 } | |
| 2000 } | |
| 2001 | |
| 2002 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
| 2003 return _hrs->length() > 0 ? _hrs->at(0) : NULL; | |
| 2004 } | |
| 2005 | |
| 2006 | |
| 2007 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
| 2008 Space* res = heap_region_containing(addr); | |
| 2009 if (res == NULL) | |
| 2010 res = perm_gen()->space_containing(addr); | |
| 2011 return res; | |
| 2012 } | |
| 2013 | |
| 2014 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
| 2015 Space* sp = space_containing(addr); | |
| 2016 if (sp != NULL) { | |
| 2017 return sp->block_start(addr); | |
| 2018 } | |
| 2019 return NULL; | |
| 2020 } | |
| 2021 | |
| 2022 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
| 2023 Space* sp = space_containing(addr); | |
| 2024 assert(sp != NULL, "block_size of address outside of heap"); | |
| 2025 return sp->block_size(addr); | |
| 2026 } | |
| 2027 | |
| 2028 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
| 2029 Space* sp = space_containing(addr); | |
| 2030 return sp->block_is_obj(addr); | |
| 2031 } | |
| 2032 | |
| 2033 bool G1CollectedHeap::supports_tlab_allocation() const { | |
| 2034 return true; | |
| 2035 } | |
| 2036 | |
| 2037 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
| 2038 return HeapRegion::GrainBytes; | |
| 2039 } | |
| 2040 | |
| 2041 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
| 2042 // Return the remaining space in the cur alloc region, but not less than | |
| 2043 // the min TLAB size. | |
| 2044 // Also, no more than half the region size, since we can't allow tlabs to | |
| 2045 // grow big enough to accomodate humongous objects. | |
| 2046 | |
| 2047 // We need to story it locally, since it might change between when we | |
| 2048 // test for NULL and when we use it later. | |
| 2049 ContiguousSpace* cur_alloc_space = _cur_alloc_region; | |
| 2050 if (cur_alloc_space == NULL) { | |
| 2051 return HeapRegion::GrainBytes/2; | |
| 2052 } else { | |
| 2053 return MAX2(MIN2(cur_alloc_space->free(), | |
| 2054 (size_t)(HeapRegion::GrainBytes/2)), | |
| 2055 (size_t)MinTLABSize); | |
| 2056 } | |
| 2057 } | |
| 2058 | |
| 2059 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t size) { | |
| 2060 bool dummy; | |
| 2061 return G1CollectedHeap::mem_allocate(size, false, true, &dummy); | |
| 2062 } | |
| 2063 | |
| 2064 bool G1CollectedHeap::allocs_are_zero_filled() { | |
| 2065 return false; | |
| 2066 } | |
| 2067 | |
| 2068 size_t G1CollectedHeap::large_typearray_limit() { | |
| 2069 // FIXME | |
| 2070 return HeapRegion::GrainBytes/HeapWordSize; | |
| 2071 } | |
| 2072 | |
| 2073 size_t G1CollectedHeap::max_capacity() const { | |
| 2074 return _g1_committed.byte_size(); | |
| 2075 } | |
| 2076 | |
| 2077 jlong G1CollectedHeap::millis_since_last_gc() { | |
| 2078 // assert(false, "NYI"); | |
| 2079 return 0; | |
| 2080 } | |
| 2081 | |
| 2082 | |
| 2083 void G1CollectedHeap::prepare_for_verify() { | |
| 2084 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
| 2085 ensure_parsability(false); | |
| 2086 } | |
| 2087 g1_rem_set()->prepare_for_verify(); | |
| 2088 } | |
| 2089 | |
| 2090 class VerifyLivenessOopClosure: public OopClosure { | |
| 2091 G1CollectedHeap* g1h; | |
| 2092 public: | |
| 2093 VerifyLivenessOopClosure(G1CollectedHeap* _g1h) { | |
| 2094 g1h = _g1h; | |
| 2095 } | |
| 2096 void do_oop(narrowOop *p) { | |
| 2097 guarantee(false, "NYI"); | |
| 2098 } | |
| 2099 void do_oop(oop *p) { | |
| 2100 oop obj = *p; | |
| 2101 assert(obj == NULL || !g1h->is_obj_dead(obj), | |
| 2102 "Dead object referenced by a not dead object"); | |
| 2103 } | |
| 2104 }; | |
| 2105 | |
| 2106 class VerifyObjsInRegionClosure: public ObjectClosure { | |
| 2107 G1CollectedHeap* _g1h; | |
| 2108 size_t _live_bytes; | |
| 2109 HeapRegion *_hr; | |
| 2110 public: | |
| 2111 VerifyObjsInRegionClosure(HeapRegion *hr) : _live_bytes(0), _hr(hr) { | |
| 2112 _g1h = G1CollectedHeap::heap(); | |
| 2113 } | |
| 2114 void do_object(oop o) { | |
| 2115 VerifyLivenessOopClosure isLive(_g1h); | |
| 2116 assert(o != NULL, "Huh?"); | |
| 2117 if (!_g1h->is_obj_dead(o)) { | |
| 2118 o->oop_iterate(&isLive); | |
| 2119 if (!_hr->obj_allocated_since_prev_marking(o)) | |
| 2120 _live_bytes += (o->size() * HeapWordSize); | |
| 2121 } | |
| 2122 } | |
| 2123 size_t live_bytes() { return _live_bytes; } | |
| 2124 }; | |
| 2125 | |
| 2126 class PrintObjsInRegionClosure : public ObjectClosure { | |
| 2127 HeapRegion *_hr; | |
| 2128 G1CollectedHeap *_g1; | |
| 2129 public: | |
| 2130 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
| 2131 _g1 = G1CollectedHeap::heap(); | |
| 2132 }; | |
| 2133 | |
| 2134 void do_object(oop o) { | |
| 2135 if (o != NULL) { | |
| 2136 HeapWord *start = (HeapWord *) o; | |
| 2137 size_t word_sz = o->size(); | |
| 2138 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
| 2139 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
| 2140 (void*) o, word_sz, | |
| 2141 _g1->isMarkedPrev(o), | |
| 2142 _g1->isMarkedNext(o), | |
| 2143 _hr->obj_allocated_since_prev_marking(o)); | |
| 2144 HeapWord *end = start + word_sz; | |
| 2145 HeapWord *cur; | |
| 2146 int *val; | |
| 2147 for (cur = start; cur < end; cur++) { | |
| 2148 val = (int *) cur; | |
| 2149 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
| 2150 } | |
| 2151 } | |
| 2152 } | |
| 2153 }; | |
| 2154 | |
| 2155 class VerifyRegionClosure: public HeapRegionClosure { | |
| 2156 public: | |
| 2157 bool _allow_dirty; | |
| 390 | 2158 bool _par; |
| 2159 VerifyRegionClosure(bool allow_dirty, bool par = false) | |
| 2160 : _allow_dirty(allow_dirty), _par(par) {} | |
| 342 | 2161 bool doHeapRegion(HeapRegion* r) { |
| 390 | 2162 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
| 2163 "Should be unclaimed at verify points."); | |
|
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2164 if (!r->continuesHumongous()) { |
| 342 | 2165 VerifyObjsInRegionClosure not_dead_yet_cl(r); |
| 2166 r->verify(_allow_dirty); | |
| 2167 r->object_iterate(¬_dead_yet_cl); | |
| 2168 guarantee(r->max_live_bytes() >= not_dead_yet_cl.live_bytes(), | |
| 2169 "More live objects than counted in last complete marking."); | |
| 2170 } | |
| 2171 return false; | |
| 2172 } | |
| 2173 }; | |
| 2174 | |
| 2175 class VerifyRootsClosure: public OopsInGenClosure { | |
| 2176 private: | |
| 2177 G1CollectedHeap* _g1h; | |
| 2178 bool _failures; | |
| 2179 | |
| 2180 public: | |
| 2181 VerifyRootsClosure() : | |
| 2182 _g1h(G1CollectedHeap::heap()), _failures(false) { } | |
| 2183 | |
| 2184 bool failures() { return _failures; } | |
| 2185 | |
| 2186 void do_oop(narrowOop* p) { | |
| 2187 guarantee(false, "NYI"); | |
| 2188 } | |
| 2189 | |
| 2190 void do_oop(oop* p) { | |
| 2191 oop obj = *p; | |
| 2192 if (obj != NULL) { | |
| 2193 if (_g1h->is_obj_dead(obj)) { | |
| 2194 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " | |
| 2195 "points to dead obj "PTR_FORMAT, p, (void*) obj); | |
| 2196 obj->print_on(gclog_or_tty); | |
| 2197 _failures = true; | |
| 2198 } | |
| 2199 } | |
| 2200 } | |
| 2201 }; | |
| 2202 | |
| 390 | 2203 // This is the task used for parallel heap verification. |
| 2204 | |
| 2205 class G1ParVerifyTask: public AbstractGangTask { | |
| 2206 private: | |
| 2207 G1CollectedHeap* _g1h; | |
| 2208 bool _allow_dirty; | |
| 2209 | |
| 2210 public: | |
| 2211 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty) : | |
| 2212 AbstractGangTask("Parallel verify task"), | |
| 2213 _g1h(g1h), _allow_dirty(allow_dirty) { } | |
| 2214 | |
| 2215 void work(int worker_i) { | |
|
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|
2216 HandleMark hm; |
| 390 | 2217 VerifyRegionClosure blk(_allow_dirty, true); |
| 2218 _g1h->heap_region_par_iterate_chunked(&blk, worker_i, | |
| 2219 HeapRegion::ParVerifyClaimValue); | |
| 2220 } | |
| 2221 }; | |
| 2222 | |
| 342 | 2223 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
| 2224 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
| 2225 if (!silent) { gclog_or_tty->print("roots "); } | |
| 2226 VerifyRootsClosure rootsCl; | |
| 2227 process_strong_roots(false, | |
| 2228 SharedHeap::SO_AllClasses, | |
| 2229 &rootsCl, | |
| 2230 &rootsCl); | |
| 2231 rem_set()->invalidate(perm_gen()->used_region(), false); | |
| 2232 if (!silent) { gclog_or_tty->print("heapRegions "); } | |
| 390 | 2233 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
| 2234 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2235 "sanity check"); | |
| 2236 | |
| 2237 G1ParVerifyTask task(this, allow_dirty); | |
| 2238 int n_workers = workers()->total_workers(); | |
| 2239 set_par_threads(n_workers); | |
| 2240 workers()->run_task(&task); | |
| 2241 set_par_threads(0); | |
| 2242 | |
| 2243 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), | |
| 2244 "sanity check"); | |
| 2245 | |
| 2246 reset_heap_region_claim_values(); | |
| 2247 | |
| 2248 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2249 "sanity check"); | |
| 2250 } else { | |
| 2251 VerifyRegionClosure blk(allow_dirty); | |
| 2252 _hrs->iterate(&blk); | |
| 2253 } | |
| 342 | 2254 if (!silent) gclog_or_tty->print("remset "); |
| 2255 rem_set()->verify(); | |
| 2256 guarantee(!rootsCl.failures(), "should not have had failures"); | |
| 2257 } else { | |
| 2258 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
| 2259 } | |
| 2260 } | |
| 2261 | |
| 2262 class PrintRegionClosure: public HeapRegionClosure { | |
| 2263 outputStream* _st; | |
| 2264 public: | |
| 2265 PrintRegionClosure(outputStream* st) : _st(st) {} | |
| 2266 bool doHeapRegion(HeapRegion* r) { | |
| 2267 r->print_on(_st); | |
| 2268 return false; | |
| 2269 } | |
| 2270 }; | |
| 2271 | |
| 2272 void G1CollectedHeap::print() const { print_on(gclog_or_tty); } | |
| 2273 | |
| 2274 void G1CollectedHeap::print_on(outputStream* st) const { | |
| 2275 PrintRegionClosure blk(st); | |
| 2276 _hrs->iterate(&blk); | |
| 2277 } | |
| 2278 | |
| 2279 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
| 2280 if (ParallelGCThreads > 0) { | |
| 2281 workers()->print_worker_threads(); | |
| 2282 } | |
| 2283 st->print("\"G1 concurrent mark GC Thread\" "); | |
| 2284 _cmThread->print(); | |
| 2285 st->cr(); | |
| 2286 st->print("\"G1 concurrent refinement GC Thread\" "); | |
| 2287 _cg1r->cg1rThread()->print_on(st); | |
| 2288 st->cr(); | |
| 2289 st->print("\"G1 zero-fill GC Thread\" "); | |
| 2290 _czft->print_on(st); | |
| 2291 st->cr(); | |
| 2292 } | |
| 2293 | |
| 2294 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
| 2295 if (ParallelGCThreads > 0) { | |
| 2296 workers()->threads_do(tc); | |
| 2297 } | |
| 2298 tc->do_thread(_cmThread); | |
| 2299 tc->do_thread(_cg1r->cg1rThread()); | |
| 2300 tc->do_thread(_czft); | |
| 2301 } | |
| 2302 | |
| 2303 void G1CollectedHeap::print_tracing_info() const { | |
| 2304 concurrent_g1_refine()->print_final_card_counts(); | |
| 2305 | |
| 2306 // We'll overload this to mean "trace GC pause statistics." | |
| 2307 if (TraceGen0Time || TraceGen1Time) { | |
| 2308 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
| 2309 // to that. | |
| 2310 g1_policy()->print_tracing_info(); | |
| 2311 } | |
| 2312 if (SummarizeG1RSStats) { | |
| 2313 g1_rem_set()->print_summary_info(); | |
| 2314 } | |
| 2315 if (SummarizeG1ConcMark) { | |
| 2316 concurrent_mark()->print_summary_info(); | |
| 2317 } | |
| 2318 if (SummarizeG1ZFStats) { | |
| 2319 ConcurrentZFThread::print_summary_info(); | |
| 2320 } | |
| 2321 if (G1SummarizePopularity) { | |
| 2322 print_popularity_summary_info(); | |
| 2323 } | |
| 2324 g1_policy()->print_yg_surv_rate_info(); | |
| 2325 | |
| 2326 GCOverheadReporter::printGCOverhead(); | |
| 2327 | |
| 2328 SpecializationStats::print(); | |
| 2329 } | |
| 2330 | |
| 2331 | |
| 2332 int G1CollectedHeap::addr_to_arena_id(void* addr) const { | |
| 2333 HeapRegion* hr = heap_region_containing(addr); | |
| 2334 if (hr == NULL) { | |
| 2335 return 0; | |
| 2336 } else { | |
| 2337 return 1; | |
| 2338 } | |
| 2339 } | |
| 2340 | |
| 2341 G1CollectedHeap* G1CollectedHeap::heap() { | |
| 2342 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
| 2343 "not a garbage-first heap"); | |
| 2344 return _g1h; | |
| 2345 } | |
| 2346 | |
| 2347 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
| 2348 if (PrintHeapAtGC){ | |
| 2349 gclog_or_tty->print_cr(" {Heap before GC collections=%d:", total_collections()); | |
| 2350 Universe::print(); | |
| 2351 } | |
| 2352 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); | |
| 2353 // Call allocation profiler | |
| 2354 AllocationProfiler::iterate_since_last_gc(); | |
| 2355 // Fill TLAB's and such | |
| 2356 ensure_parsability(true); | |
| 2357 } | |
| 2358 | |
| 2359 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
| 2360 // FIXME: what is this about? | |
| 2361 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
| 2362 // is set. | |
| 2363 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
| 2364 "derived pointer present")); | |
| 2365 | |
| 2366 if (PrintHeapAtGC){ | |
| 2367 gclog_or_tty->print_cr(" Heap after GC collections=%d:", total_collections()); | |
| 2368 Universe::print(); | |
| 2369 gclog_or_tty->print("} "); | |
| 2370 } | |
| 2371 } | |
| 2372 | |
| 2373 void G1CollectedHeap::do_collection_pause() { | |
| 2374 // Read the GC count while holding the Heap_lock | |
| 2375 // we need to do this _before_ wait_for_cleanup_complete(), to | |
| 2376 // ensure that we do not give up the heap lock and potentially | |
| 2377 // pick up the wrong count | |
| 2378 int gc_count_before = SharedHeap::heap()->total_collections(); | |
| 2379 | |
| 2380 // Don't want to do a GC pause while cleanup is being completed! | |
| 2381 wait_for_cleanup_complete(); | |
| 2382 | |
| 2383 g1_policy()->record_stop_world_start(); | |
| 2384 { | |
| 2385 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
| 2386 VM_G1IncCollectionPause op(gc_count_before); | |
| 2387 VMThread::execute(&op); | |
| 2388 } | |
| 2389 } | |
| 2390 | |
| 2391 void | |
| 2392 G1CollectedHeap::doConcurrentMark() { | |
| 2393 if (G1ConcMark) { | |
| 2394 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); | |
| 2395 if (!_cmThread->in_progress()) { | |
| 2396 _cmThread->set_started(); | |
| 2397 CGC_lock->notify(); | |
| 2398 } | |
| 2399 } | |
| 2400 } | |
| 2401 | |
| 2402 class VerifyMarkedObjsClosure: public ObjectClosure { | |
| 2403 G1CollectedHeap* _g1h; | |
| 2404 public: | |
| 2405 VerifyMarkedObjsClosure(G1CollectedHeap* g1h) : _g1h(g1h) {} | |
| 2406 void do_object(oop obj) { | |
| 2407 assert(obj->mark()->is_marked() ? !_g1h->is_obj_dead(obj) : true, | |
| 2408 "markandsweep mark should agree with concurrent deadness"); | |
| 2409 } | |
| 2410 }; | |
| 2411 | |
| 2412 void | |
| 2413 G1CollectedHeap::checkConcurrentMark() { | |
| 2414 VerifyMarkedObjsClosure verifycl(this); | |
| 2415 // MutexLockerEx x(getMarkBitMapLock(), | |
| 2416 // Mutex::_no_safepoint_check_flag); | |
| 2417 object_iterate(&verifycl); | |
| 2418 } | |
| 2419 | |
| 2420 void G1CollectedHeap::do_sync_mark() { | |
| 2421 _cm->checkpointRootsInitial(); | |
| 2422 _cm->markFromRoots(); | |
| 2423 _cm->checkpointRootsFinal(false); | |
| 2424 } | |
| 2425 | |
| 2426 // <NEW PREDICTION> | |
| 2427 | |
| 2428 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
| 2429 bool young) { | |
| 2430 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
| 2431 } | |
| 2432 | |
| 2433 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
| 2434 predicted_time_ms) { | |
| 2435 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
| 2436 } | |
| 2437 | |
| 2438 size_t G1CollectedHeap::pending_card_num() { | |
| 2439 size_t extra_cards = 0; | |
| 2440 JavaThread *curr = Threads::first(); | |
| 2441 while (curr != NULL) { | |
| 2442 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
| 2443 extra_cards += dcq.size(); | |
| 2444 curr = curr->next(); | |
| 2445 } | |
| 2446 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 2447 size_t buffer_size = dcqs.buffer_size(); | |
| 2448 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 2449 return buffer_size * buffer_num + extra_cards; | |
| 2450 } | |
| 2451 | |
| 2452 size_t G1CollectedHeap::max_pending_card_num() { | |
| 2453 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 2454 size_t buffer_size = dcqs.buffer_size(); | |
| 2455 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 2456 int thread_num = Threads::number_of_threads(); | |
| 2457 return (buffer_num + thread_num) * buffer_size; | |
| 2458 } | |
| 2459 | |
| 2460 size_t G1CollectedHeap::cards_scanned() { | |
| 2461 HRInto_G1RemSet* g1_rset = (HRInto_G1RemSet*) g1_rem_set(); | |
| 2462 return g1_rset->cardsScanned(); | |
| 2463 } | |
| 2464 | |
| 2465 void | |
| 2466 G1CollectedHeap::setup_surviving_young_words() { | |
| 2467 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
| 2468 size_t array_length = g1_policy()->young_cset_length(); | |
| 2469 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); | |
| 2470 if (_surviving_young_words == NULL) { | |
| 2471 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
| 2472 "Not enough space for young surv words summary."); | |
| 2473 } | |
| 2474 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
| 2475 for (size_t i = 0; i < array_length; ++i) { | |
| 2476 guarantee( _surviving_young_words[i] == 0, "invariant" ); | |
| 2477 } | |
| 2478 } | |
| 2479 | |
| 2480 void | |
| 2481 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
| 2482 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 2483 size_t array_length = g1_policy()->young_cset_length(); | |
| 2484 for (size_t i = 0; i < array_length; ++i) | |
| 2485 _surviving_young_words[i] += surv_young_words[i]; | |
| 2486 } | |
| 2487 | |
| 2488 void | |
| 2489 G1CollectedHeap::cleanup_surviving_young_words() { | |
| 2490 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
| 2491 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
| 2492 _surviving_young_words = NULL; | |
| 2493 } | |
| 2494 | |
| 2495 // </NEW PREDICTION> | |
| 2496 | |
| 2497 void | |
| 2498 G1CollectedHeap::do_collection_pause_at_safepoint(HeapRegion* popular_region) { | |
| 2499 char verbose_str[128]; | |
| 2500 sprintf(verbose_str, "GC pause "); | |
| 2501 if (popular_region != NULL) | |
| 2502 strcat(verbose_str, "(popular)"); | |
| 2503 else if (g1_policy()->in_young_gc_mode()) { | |
| 2504 if (g1_policy()->full_young_gcs()) | |
| 2505 strcat(verbose_str, "(young)"); | |
| 2506 else | |
| 2507 strcat(verbose_str, "(partial)"); | |
| 2508 } | |
| 2509 bool reset_should_initiate_conc_mark = false; | |
| 2510 if (popular_region != NULL && g1_policy()->should_initiate_conc_mark()) { | |
| 2511 // we currently do not allow an initial mark phase to be piggy-backed | |
| 2512 // on a popular pause | |
| 2513 reset_should_initiate_conc_mark = true; | |
| 2514 g1_policy()->unset_should_initiate_conc_mark(); | |
| 2515 } | |
| 2516 if (g1_policy()->should_initiate_conc_mark()) | |
| 2517 strcat(verbose_str, " (initial-mark)"); | |
| 2518 | |
| 2519 GCCauseSetter x(this, (popular_region == NULL ? | |
| 2520 GCCause::_g1_inc_collection_pause : | |
| 2521 GCCause::_g1_pop_region_collection_pause)); | |
| 2522 | |
| 2523 // if PrintGCDetails is on, we'll print long statistics information | |
| 2524 // in the collector policy code, so let's not print this as the output | |
| 2525 // is messy if we do. | |
| 2526 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
| 2527 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
| 2528 TraceTime t(verbose_str, PrintGC && !PrintGCDetails, true, gclog_or_tty); | |
| 2529 | |
| 2530 ResourceMark rm; | |
| 2531 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
| 2532 assert(Thread::current() == VMThread::vm_thread(), "should be in vm thread"); | |
| 2533 guarantee(!is_gc_active(), "collection is not reentrant"); | |
| 2534 assert(regions_accounted_for(), "Region leakage!"); | |
|
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2535 |
|
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2536 increment_gc_time_stamp(); |
| 342 | 2537 |
| 2538 if (g1_policy()->in_young_gc_mode()) { | |
| 2539 assert(check_young_list_well_formed(), | |
| 2540 "young list should be well formed"); | |
| 2541 } | |
| 2542 | |
| 2543 if (GC_locker::is_active()) { | |
| 2544 return; // GC is disabled (e.g. JNI GetXXXCritical operation) | |
| 2545 } | |
| 2546 | |
| 2547 bool abandoned = false; | |
| 2548 { // Call to jvmpi::post_class_unload_events must occur outside of active GC | |
| 2549 IsGCActiveMark x; | |
| 2550 | |
| 2551 gc_prologue(false); | |
| 2552 increment_total_collections(); | |
| 2553 | |
| 2554 #if G1_REM_SET_LOGGING | |
| 2555 gclog_or_tty->print_cr("\nJust chose CS, heap:"); | |
| 2556 print(); | |
| 2557 #endif | |
| 2558 | |
| 2559 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
| 2560 HandleMark hm; // Discard invalid handles created during verification | |
| 2561 prepare_for_verify(); | |
| 2562 gclog_or_tty->print(" VerifyBeforeGC:"); | |
| 2563 Universe::verify(false); | |
| 2564 } | |
| 2565 | |
| 2566 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 2567 | |
|
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2568 // We want to turn off ref discovery, if necessary, and turn it back on |
| 342 | 2569 // on again later if we do. |
| 2570 bool was_enabled = ref_processor()->discovery_enabled(); | |
| 2571 if (was_enabled) ref_processor()->disable_discovery(); | |
| 2572 | |
| 2573 // Forget the current alloc region (we might even choose it to be part | |
| 2574 // of the collection set!). | |
| 2575 abandon_cur_alloc_region(); | |
| 2576 | |
| 2577 // The elapsed time induced by the start time below deliberately elides | |
| 2578 // the possible verification above. | |
| 2579 double start_time_sec = os::elapsedTime(); | |
| 2580 GCOverheadReporter::recordSTWStart(start_time_sec); | |
| 2581 size_t start_used_bytes = used(); | |
| 2582 if (!G1ConcMark) { | |
| 2583 do_sync_mark(); | |
| 2584 } | |
| 2585 | |
| 2586 g1_policy()->record_collection_pause_start(start_time_sec, | |
| 2587 start_used_bytes); | |
| 2588 | |
| 526 | 2589 guarantee(_in_cset_fast_test == NULL, "invariant"); |
| 2590 guarantee(_in_cset_fast_test_base == NULL, "invariant"); | |
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2591 _in_cset_fast_test_length = max_regions(); |
| 526 | 2592 _in_cset_fast_test_base = |
| 2593 NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); | |
| 2594 memset(_in_cset_fast_test_base, false, | |
| 2595 _in_cset_fast_test_length * sizeof(bool)); | |
| 2596 // We're biasing _in_cset_fast_test to avoid subtracting the | |
| 2597 // beginning of the heap every time we want to index; basically | |
| 2598 // it's the same with what we do with the card table. | |
| 2599 _in_cset_fast_test = _in_cset_fast_test_base - | |
| 2600 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); | |
| 2601 | |
| 342 | 2602 #if SCAN_ONLY_VERBOSE |
| 2603 _young_list->print(); | |
| 2604 #endif // SCAN_ONLY_VERBOSE | |
| 2605 | |
| 2606 if (g1_policy()->should_initiate_conc_mark()) { | |
| 2607 concurrent_mark()->checkpointRootsInitialPre(); | |
| 2608 } | |
| 2609 save_marks(); | |
| 2610 | |
| 605 | 2611 // We must do this before any possible evacuation that should propagate |
| 342 | 2612 // marks, including evacuation of popular objects in a popular pause. |
| 2613 if (mark_in_progress()) { | |
| 2614 double start_time_sec = os::elapsedTime(); | |
| 2615 | |
| 2616 _cm->drainAllSATBBuffers(); | |
| 2617 double finish_mark_ms = (os::elapsedTime() - start_time_sec) * 1000.0; | |
| 2618 g1_policy()->record_satb_drain_time(finish_mark_ms); | |
| 2619 | |
| 2620 } | |
| 2621 // Record the number of elements currently on the mark stack, so we | |
| 2622 // only iterate over these. (Since evacuation may add to the mark | |
| 2623 // stack, doing more exposes race conditions.) If no mark is in | |
| 2624 // progress, this will be zero. | |
| 2625 _cm->set_oops_do_bound(); | |
| 2626 | |
| 2627 assert(regions_accounted_for(), "Region leakage."); | |
| 2628 | |
| 2629 bool abandoned = false; | |
| 2630 | |
| 2631 if (mark_in_progress()) | |
| 2632 concurrent_mark()->newCSet(); | |
| 2633 | |
| 2634 // Now choose the CS. | |
| 2635 if (popular_region == NULL) { | |
| 2636 g1_policy()->choose_collection_set(); | |
| 2637 } else { | |
| 2638 // We may be evacuating a single region (for popularity). | |
| 2639 g1_policy()->record_popular_pause_preamble_start(); | |
| 2640 popularity_pause_preamble(popular_region); | |
| 2641 g1_policy()->record_popular_pause_preamble_end(); | |
| 2642 abandoned = (g1_policy()->collection_set() == NULL); | |
| 2643 // Now we allow more regions to be added (we have to collect | |
| 2644 // all popular regions). | |
| 2645 if (!abandoned) { | |
| 2646 g1_policy()->choose_collection_set(popular_region); | |
| 2647 } | |
| 2648 } | |
| 2649 // We may abandon a pause if we find no region that will fit in the MMU | |
| 2650 // pause. | |
| 2651 abandoned = (g1_policy()->collection_set() == NULL); | |
| 2652 | |
| 2653 // Nothing to do if we were unable to choose a collection set. | |
| 2654 if (!abandoned) { | |
| 2655 #if G1_REM_SET_LOGGING | |
| 2656 gclog_or_tty->print_cr("\nAfter pause, heap:"); | |
| 2657 print(); | |
| 2658 #endif | |
| 2659 | |
| 2660 setup_surviving_young_words(); | |
| 2661 | |
| 2662 // Set up the gc allocation regions. | |
| 2663 get_gc_alloc_regions(); | |
| 2664 | |
| 2665 // Actually do the work... | |
| 2666 evacuate_collection_set(); | |
| 2667 free_collection_set(g1_policy()->collection_set()); | |
| 2668 g1_policy()->clear_collection_set(); | |
| 2669 | |
| 526 | 2670 FREE_C_HEAP_ARRAY(bool, _in_cset_fast_test_base); |
| 2671 // this is more for peace of mind; we're nulling them here and | |
| 2672 // we're expecting them to be null at the beginning of the next GC | |
| 2673 _in_cset_fast_test = NULL; | |
| 2674 _in_cset_fast_test_base = NULL; | |
| 2675 | |
| 342 | 2676 if (popular_region != NULL) { |
| 2677 // We have to wait until now, because we don't want the region to | |
| 2678 // be rescheduled for pop-evac during RS update. | |
| 2679 popular_region->set_popular_pending(false); | |
| 2680 } | |
| 2681 | |
| 636 | 2682 release_gc_alloc_regions(false /* totally */); |
| 342 | 2683 |
| 2684 cleanup_surviving_young_words(); | |
| 2685 | |
| 2686 if (g1_policy()->in_young_gc_mode()) { | |
| 2687 _young_list->reset_sampled_info(); | |
| 2688 assert(check_young_list_empty(true), | |
| 2689 "young list should be empty"); | |
| 2690 | |
| 2691 #if SCAN_ONLY_VERBOSE | |
| 2692 _young_list->print(); | |
| 2693 #endif // SCAN_ONLY_VERBOSE | |
| 2694 | |
| 545 | 2695 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
| 2696 _young_list->first_survivor_region(), | |
| 2697 _young_list->last_survivor_region()); | |
| 342 | 2698 _young_list->reset_auxilary_lists(); |
| 2699 } | |
| 2700 } else { | |
| 2701 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 2702 } | |
| 2703 | |
| 2704 if (evacuation_failed()) { | |
| 2705 _summary_bytes_used = recalculate_used(); | |
| 2706 } else { | |
| 2707 // The "used" of the the collection set have already been subtracted | |
| 2708 // when they were freed. Add in the bytes evacuated. | |
| 2709 _summary_bytes_used += g1_policy()->bytes_in_to_space(); | |
| 2710 } | |
| 2711 | |
| 2712 if (g1_policy()->in_young_gc_mode() && | |
| 2713 g1_policy()->should_initiate_conc_mark()) { | |
| 2714 concurrent_mark()->checkpointRootsInitialPost(); | |
| 2715 set_marking_started(); | |
| 2716 doConcurrentMark(); | |
| 2717 } | |
| 2718 | |
| 2719 #if SCAN_ONLY_VERBOSE | |
| 2720 _young_list->print(); | |
| 2721 #endif // SCAN_ONLY_VERBOSE | |
| 2722 | |
| 2723 double end_time_sec = os::elapsedTime(); | |
|
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2724 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
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2725 g1_policy()->record_pause_time_ms(pause_time_ms); |
| 342 | 2726 GCOverheadReporter::recordSTWEnd(end_time_sec); |
| 2727 g1_policy()->record_collection_pause_end(popular_region != NULL, | |
| 2728 abandoned); | |
| 2729 | |
| 2730 assert(regions_accounted_for(), "Region leakage."); | |
| 2731 | |
| 2732 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { | |
| 2733 HandleMark hm; // Discard invalid handles created during verification | |
| 2734 gclog_or_tty->print(" VerifyAfterGC:"); | |
|
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2735 prepare_for_verify(); |
| 342 | 2736 Universe::verify(false); |
| 2737 } | |
| 2738 | |
| 2739 if (was_enabled) ref_processor()->enable_discovery(); | |
| 2740 | |
| 2741 { | |
| 2742 size_t expand_bytes = g1_policy()->expansion_amount(); | |
| 2743 if (expand_bytes > 0) { | |
| 2744 size_t bytes_before = capacity(); | |
| 2745 expand(expand_bytes); | |
| 2746 } | |
| 2747 } | |
| 2748 | |
|
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2749 if (mark_in_progress()) { |
| 342 | 2750 concurrent_mark()->update_g1_committed(); |
|
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2751 } |
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2752 |
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2753 #ifdef TRACESPINNING |
|
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2754 ParallelTaskTerminator::print_termination_counts(); |
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2755 #endif |
| 342 | 2756 |
| 2757 gc_epilogue(false); | |
| 2758 } | |
| 2759 | |
| 2760 assert(verify_region_lists(), "Bad region lists."); | |
| 2761 | |
| 2762 if (reset_should_initiate_conc_mark) | |
| 2763 g1_policy()->set_should_initiate_conc_mark(); | |
| 2764 | |
| 2765 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { | |
| 2766 gclog_or_tty->print_cr("Stopping after GC #%d", ExitAfterGCNum); | |
| 2767 print_tracing_info(); | |
| 2768 vm_exit(-1); | |
| 2769 } | |
| 2770 } | |
| 2771 | |
| 2772 void G1CollectedHeap::set_gc_alloc_region(int purpose, HeapRegion* r) { | |
| 2773 assert(purpose >= 0 && purpose < GCAllocPurposeCount, "invalid purpose"); | |
| 636 | 2774 // make sure we don't call set_gc_alloc_region() multiple times on |
| 2775 // the same region | |
| 2776 assert(r == NULL || !r->is_gc_alloc_region(), | |
| 2777 "shouldn't already be a GC alloc region"); | |
| 342 | 2778 HeapWord* original_top = NULL; |
| 2779 if (r != NULL) | |
| 2780 original_top = r->top(); | |
| 2781 | |
| 2782 // We will want to record the used space in r as being there before gc. | |
| 2783 // One we install it as a GC alloc region it's eligible for allocation. | |
| 2784 // So record it now and use it later. | |
| 2785 size_t r_used = 0; | |
| 2786 if (r != NULL) { | |
| 2787 r_used = r->used(); | |
| 2788 | |
| 2789 if (ParallelGCThreads > 0) { | |
| 2790 // need to take the lock to guard against two threads calling | |
| 2791 // get_gc_alloc_region concurrently (very unlikely but...) | |
| 2792 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 2793 r->save_marks(); | |
| 2794 } | |
| 2795 } | |
| 2796 HeapRegion* old_alloc_region = _gc_alloc_regions[purpose]; | |
| 2797 _gc_alloc_regions[purpose] = r; | |
| 2798 if (old_alloc_region != NULL) { | |
| 2799 // Replace aliases too. | |
| 2800 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 2801 if (_gc_alloc_regions[ap] == old_alloc_region) { | |
| 2802 _gc_alloc_regions[ap] = r; | |
| 2803 } | |
| 2804 } | |
| 2805 } | |
| 2806 if (r != NULL) { | |
| 2807 push_gc_alloc_region(r); | |
| 2808 if (mark_in_progress() && original_top != r->next_top_at_mark_start()) { | |
| 2809 // We are using a region as a GC alloc region after it has been used | |
| 2810 // as a mutator allocation region during the current marking cycle. | |
| 2811 // The mutator-allocated objects are currently implicitly marked, but | |
| 2812 // when we move hr->next_top_at_mark_start() forward at the the end | |
| 2813 // of the GC pause, they won't be. We therefore mark all objects in | |
| 2814 // the "gap". We do this object-by-object, since marking densely | |
| 2815 // does not currently work right with marking bitmap iteration. This | |
| 2816 // means we rely on TLAB filling at the start of pauses, and no | |
| 2817 // "resuscitation" of filled TLAB's. If we want to do this, we need | |
| 2818 // to fix the marking bitmap iteration. | |
| 2819 HeapWord* curhw = r->next_top_at_mark_start(); | |
| 2820 HeapWord* t = original_top; | |
| 2821 | |
| 2822 while (curhw < t) { | |
| 2823 oop cur = (oop)curhw; | |
| 2824 // We'll assume parallel for generality. This is rare code. | |
| 2825 concurrent_mark()->markAndGrayObjectIfNecessary(cur); // can't we just mark them? | |
| 2826 curhw = curhw + cur->size(); | |
| 2827 } | |
| 2828 assert(curhw == t, "Should have parsed correctly."); | |
| 2829 } | |
| 2830 if (G1PolicyVerbose > 1) { | |
| 2831 gclog_or_tty->print("New alloc region ["PTR_FORMAT", "PTR_FORMAT", " PTR_FORMAT") " | |
| 2832 "for survivors:", r->bottom(), original_top, r->end()); | |
| 2833 r->print(); | |
| 2834 } | |
| 2835 g1_policy()->record_before_bytes(r_used); | |
| 2836 } | |
| 2837 } | |
| 2838 | |
| 2839 void G1CollectedHeap::push_gc_alloc_region(HeapRegion* hr) { | |
| 2840 assert(Thread::current()->is_VM_thread() || | |
| 2841 par_alloc_during_gc_lock()->owned_by_self(), "Precondition"); | |
| 2842 assert(!hr->is_gc_alloc_region() && !hr->in_collection_set(), | |
| 2843 "Precondition."); | |
| 2844 hr->set_is_gc_alloc_region(true); | |
| 2845 hr->set_next_gc_alloc_region(_gc_alloc_region_list); | |
| 2846 _gc_alloc_region_list = hr; | |
| 2847 } | |
| 2848 | |
| 2849 #ifdef G1_DEBUG | |
| 2850 class FindGCAllocRegion: public HeapRegionClosure { | |
| 2851 public: | |
| 2852 bool doHeapRegion(HeapRegion* r) { | |
| 2853 if (r->is_gc_alloc_region()) { | |
| 2854 gclog_or_tty->print_cr("Region %d ["PTR_FORMAT"...] is still a gc_alloc_region.", | |
| 2855 r->hrs_index(), r->bottom()); | |
| 2856 } | |
| 2857 return false; | |
| 2858 } | |
| 2859 }; | |
| 2860 #endif // G1_DEBUG | |
| 2861 | |
| 2862 void G1CollectedHeap::forget_alloc_region_list() { | |
| 2863 assert(Thread::current()->is_VM_thread(), "Precondition"); | |
| 2864 while (_gc_alloc_region_list != NULL) { | |
| 2865 HeapRegion* r = _gc_alloc_region_list; | |
| 2866 assert(r->is_gc_alloc_region(), "Invariant."); | |
|
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2867 // We need HeapRegion::oops_on_card_seq_iterate_careful() to work on |
|
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2868 // newly allocated data in order to be able to apply deferred updates |
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2869 // before the GC is done for verification purposes (i.e to allow |
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2870 // G1HRRSFlushLogBuffersOnVerify). It's safe thing to do after the |
|
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2871 // collection. |
|
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2872 r->ContiguousSpace::set_saved_mark(); |
| 342 | 2873 _gc_alloc_region_list = r->next_gc_alloc_region(); |
| 2874 r->set_next_gc_alloc_region(NULL); | |
| 2875 r->set_is_gc_alloc_region(false); | |
| 545 | 2876 if (r->is_survivor()) { |
| 2877 if (r->is_empty()) { | |
| 2878 r->set_not_young(); | |
| 2879 } else { | |
| 2880 _young_list->add_survivor_region(r); | |
| 2881 } | |
| 2882 } | |
| 342 | 2883 if (r->is_empty()) { |
| 2884 ++_free_regions; | |
| 2885 } | |
| 2886 } | |
| 2887 #ifdef G1_DEBUG | |
| 2888 FindGCAllocRegion fa; | |
| 2889 heap_region_iterate(&fa); | |
| 2890 #endif // G1_DEBUG | |
| 2891 } | |
| 2892 | |
| 2893 | |
| 2894 bool G1CollectedHeap::check_gc_alloc_regions() { | |
| 2895 // TODO: allocation regions check | |
| 2896 return true; | |
| 2897 } | |
| 2898 | |
| 2899 void G1CollectedHeap::get_gc_alloc_regions() { | |
| 636 | 2900 // First, let's check that the GC alloc region list is empty (it should) |
| 2901 assert(_gc_alloc_region_list == NULL, "invariant"); | |
| 2902 | |
| 342 | 2903 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
| 636 | 2904 assert(_gc_alloc_regions[ap] == NULL, "invariant"); |
| 2905 | |
| 342 | 2906 // Create new GC alloc regions. |
| 636 | 2907 HeapRegion* alloc_region = _retained_gc_alloc_regions[ap]; |
| 2908 _retained_gc_alloc_regions[ap] = NULL; | |
| 2909 | |
| 2910 if (alloc_region != NULL) { | |
| 2911 assert(_retain_gc_alloc_region[ap], "only way to retain a GC region"); | |
| 2912 | |
| 2913 // let's make sure that the GC alloc region is not tagged as such | |
| 2914 // outside a GC operation | |
| 2915 assert(!alloc_region->is_gc_alloc_region(), "sanity"); | |
| 2916 | |
| 2917 if (alloc_region->in_collection_set() || | |
| 2918 alloc_region->top() == alloc_region->end() || | |
| 2919 alloc_region->top() == alloc_region->bottom()) { | |
| 2920 // we will discard the current GC alloc region if it's in the | |
| 2921 // collection set (it can happen!), if it's already full (no | |
| 2922 // point in using it), or if it's empty (this means that it | |
| 2923 // was emptied during a cleanup and it should be on the free | |
| 2924 // list now). | |
| 2925 | |
| 2926 alloc_region = NULL; | |
| 2927 } | |
| 2928 } | |
| 2929 | |
| 2930 if (alloc_region == NULL) { | |
| 2931 // we will get a new GC alloc region | |
| 342 | 2932 alloc_region = newAllocRegionWithExpansion(ap, 0); |
| 2933 } | |
| 636 | 2934 |
| 342 | 2935 if (alloc_region != NULL) { |
| 636 | 2936 assert(_gc_alloc_regions[ap] == NULL, "pre-condition"); |
| 342 | 2937 set_gc_alloc_region(ap, alloc_region); |
| 2938 } | |
| 636 | 2939 |
| 2940 assert(_gc_alloc_regions[ap] == NULL || | |
| 2941 _gc_alloc_regions[ap]->is_gc_alloc_region(), | |
| 2942 "the GC alloc region should be tagged as such"); | |
| 2943 assert(_gc_alloc_regions[ap] == NULL || | |
| 2944 _gc_alloc_regions[ap] == _gc_alloc_region_list, | |
| 2945 "the GC alloc region should be the same as the GC alloc list head"); | |
| 342 | 2946 } |
| 2947 // Set alternative regions for allocation purposes that have reached | |
| 636 | 2948 // their limit. |
| 342 | 2949 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
| 2950 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(ap); | |
| 2951 if (_gc_alloc_regions[ap] == NULL && alt_purpose != ap) { | |
| 2952 _gc_alloc_regions[ap] = _gc_alloc_regions[alt_purpose]; | |
| 2953 } | |
| 2954 } | |
| 2955 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
| 2956 } | |
| 2957 | |
| 636 | 2958 void G1CollectedHeap::release_gc_alloc_regions(bool totally) { |
| 342 | 2959 // We keep a separate list of all regions that have been alloc regions in |
| 636 | 2960 // the current collection pause. Forget that now. This method will |
| 2961 // untag the GC alloc regions and tear down the GC alloc region | |
| 2962 // list. It's desirable that no regions are tagged as GC alloc | |
| 2963 // outside GCs. | |
| 342 | 2964 forget_alloc_region_list(); |
| 2965 | |
| 2966 // The current alloc regions contain objs that have survived | |
| 2967 // collection. Make them no longer GC alloc regions. | |
| 2968 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 2969 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 636 | 2970 _retained_gc_alloc_regions[ap] = NULL; |
| 2971 | |
| 2972 if (r != NULL) { | |
| 2973 // we retain nothing on _gc_alloc_regions between GCs | |
| 2974 set_gc_alloc_region(ap, NULL); | |
| 2975 _gc_alloc_region_counts[ap] = 0; | |
| 2976 | |
| 2977 if (r->is_empty()) { | |
| 2978 // we didn't actually allocate anything in it; let's just put | |
| 2979 // it on the free list | |
| 342 | 2980 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); |
| 2981 r->set_zero_fill_complete(); | |
| 2982 put_free_region_on_list_locked(r); | |
| 636 | 2983 } else if (_retain_gc_alloc_region[ap] && !totally) { |
| 2984 // retain it so that we can use it at the beginning of the next GC | |
| 2985 _retained_gc_alloc_regions[ap] = r; | |
| 342 | 2986 } |
| 2987 } | |
| 636 | 2988 } |
| 2989 } | |
| 2990 | |
| 2991 #ifndef PRODUCT | |
| 2992 // Useful for debugging | |
| 2993 | |
| 2994 void G1CollectedHeap::print_gc_alloc_regions() { | |
| 2995 gclog_or_tty->print_cr("GC alloc regions"); | |
| 2996 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 2997 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 2998 if (r == NULL) { | |
| 2999 gclog_or_tty->print_cr(" %2d : "PTR_FORMAT, ap, NULL); | |
| 3000 } else { | |
| 3001 gclog_or_tty->print_cr(" %2d : "PTR_FORMAT" "SIZE_FORMAT, | |
| 3002 ap, r->bottom(), r->used()); | |
| 3003 } | |
| 3004 } | |
| 3005 } | |
| 3006 #endif // PRODUCT | |
| 342 | 3007 |
| 3008 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
| 3009 _drain_in_progress = false; | |
| 3010 set_evac_failure_closure(cl); | |
| 3011 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 3012 } | |
| 3013 | |
| 3014 void G1CollectedHeap::finalize_for_evac_failure() { | |
| 3015 assert(_evac_failure_scan_stack != NULL && | |
| 3016 _evac_failure_scan_stack->length() == 0, | |
| 3017 "Postcondition"); | |
| 3018 assert(!_drain_in_progress, "Postcondition"); | |
| 3019 // Don't have to delete, since the scan stack is a resource object. | |
| 3020 _evac_failure_scan_stack = NULL; | |
| 3021 } | |
| 3022 | |
| 3023 | |
| 3024 | |
| 3025 // *** Sequential G1 Evacuation | |
| 3026 | |
| 3027 HeapWord* G1CollectedHeap::allocate_during_gc(GCAllocPurpose purpose, size_t word_size) { | |
| 3028 HeapRegion* alloc_region = _gc_alloc_regions[purpose]; | |
| 3029 // let the caller handle alloc failure | |
| 3030 if (alloc_region == NULL) return NULL; | |
| 3031 assert(isHumongous(word_size) || !alloc_region->isHumongous(), | |
| 3032 "Either the object is humongous or the region isn't"); | |
| 3033 HeapWord* block = alloc_region->allocate(word_size); | |
| 3034 if (block == NULL) { | |
| 3035 block = allocate_during_gc_slow(purpose, alloc_region, false, word_size); | |
| 3036 } | |
| 3037 return block; | |
| 3038 } | |
| 3039 | |
| 3040 class G1IsAliveClosure: public BoolObjectClosure { | |
| 3041 G1CollectedHeap* _g1; | |
| 3042 public: | |
| 3043 G1IsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
| 3044 void do_object(oop p) { assert(false, "Do not call."); } | |
| 3045 bool do_object_b(oop p) { | |
| 3046 // It is reachable if it is outside the collection set, or is inside | |
| 3047 // and forwarded. | |
| 3048 | |
| 3049 #ifdef G1_DEBUG | |
| 3050 gclog_or_tty->print_cr("is alive "PTR_FORMAT" in CS %d forwarded %d overall %d", | |
| 3051 (void*) p, _g1->obj_in_cs(p), p->is_forwarded(), | |
| 3052 !_g1->obj_in_cs(p) || p->is_forwarded()); | |
| 3053 #endif // G1_DEBUG | |
| 3054 | |
| 3055 return !_g1->obj_in_cs(p) || p->is_forwarded(); | |
| 3056 } | |
| 3057 }; | |
| 3058 | |
| 3059 class G1KeepAliveClosure: public OopClosure { | |
| 3060 G1CollectedHeap* _g1; | |
| 3061 public: | |
| 3062 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
| 3063 void do_oop(narrowOop* p) { | |
| 3064 guarantee(false, "NYI"); | |
| 3065 } | |
| 3066 void do_oop(oop* p) { | |
| 3067 oop obj = *p; | |
| 3068 #ifdef G1_DEBUG | |
| 3069 if (PrintGC && Verbose) { | |
| 3070 gclog_or_tty->print_cr("keep alive *"PTR_FORMAT" = "PTR_FORMAT" "PTR_FORMAT, | |
| 3071 p, (void*) obj, (void*) *p); | |
| 3072 } | |
| 3073 #endif // G1_DEBUG | |
| 3074 | |
| 3075 if (_g1->obj_in_cs(obj)) { | |
| 3076 assert( obj->is_forwarded(), "invariant" ); | |
| 3077 *p = obj->forwardee(); | |
| 3078 | |
| 3079 #ifdef G1_DEBUG | |
| 3080 gclog_or_tty->print_cr(" in CSet: moved "PTR_FORMAT" -> "PTR_FORMAT, | |
| 3081 (void*) obj, (void*) *p); | |
| 3082 #endif // G1_DEBUG | |
| 3083 } | |
| 3084 } | |
| 3085 }; | |
| 3086 | |
|
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3087 class UpdateRSetImmediate : public OopsInHeapRegionClosure { |
| 342 | 3088 private: |
| 3089 G1CollectedHeap* _g1; | |
| 3090 G1RemSet* _g1_rem_set; | |
| 3091 public: | |
|
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3092 UpdateRSetImmediate(G1CollectedHeap* g1) : |
|
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3093 _g1(g1), _g1_rem_set(g1->g1_rem_set()) {} |
| 342 | 3094 |
| 3095 void do_oop(narrowOop* p) { | |
| 3096 guarantee(false, "NYI"); | |
| 3097 } | |
| 3098 void do_oop(oop* p) { | |
| 3099 assert(_from->is_in_reserved(p), "paranoia"); | |
|
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3100 if (*p != NULL && !_from->is_survivor()) { |
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3101 _g1_rem_set->par_write_ref(_from, p, 0); |
| 342 | 3102 } |
| 3103 } | |
| 3104 }; | |
| 3105 | |
|
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3106 class UpdateRSetDeferred : public OopsInHeapRegionClosure { |
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3107 private: |
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3108 G1CollectedHeap* _g1; |
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3109 DirtyCardQueue *_dcq; |
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3110 CardTableModRefBS* _ct_bs; |
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3111 |
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3112 public: |
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3113 UpdateRSetDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
|
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3114 _g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) {} |
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3115 |
|
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3116 void do_oop(narrowOop* p) { |
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3117 guarantee(false, "NYI"); |
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3118 } |
|
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3119 void do_oop(oop* p) { |
|
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3120 assert(_from->is_in_reserved(p), "paranoia"); |
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3121 if (!_from->is_in_reserved(*p) && !_from->is_survivor()) { |
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3122 size_t card_index = _ct_bs->index_for(p); |
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3123 if (_ct_bs->mark_card_deferred(card_index)) { |
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3124 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
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3125 } |
|
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3126 } |
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3127 } |
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3128 }; |
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3129 |
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3130 |
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3131 |
| 342 | 3132 class RemoveSelfPointerClosure: public ObjectClosure { |
| 3133 private: | |
| 3134 G1CollectedHeap* _g1; | |
| 3135 ConcurrentMark* _cm; | |
| 3136 HeapRegion* _hr; | |
| 3137 size_t _prev_marked_bytes; | |
| 3138 size_t _next_marked_bytes; | |
|
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3139 OopsInHeapRegionClosure *_cl; |
| 342 | 3140 public: |
|
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3141 RemoveSelfPointerClosure(G1CollectedHeap* g1, OopsInHeapRegionClosure* cl) : |
|
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3142 _g1(g1), _cm(_g1->concurrent_mark()), _prev_marked_bytes(0), |
|
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3143 _next_marked_bytes(0), _cl(cl) {} |
| 342 | 3144 |
| 3145 size_t prev_marked_bytes() { return _prev_marked_bytes; } | |
| 3146 size_t next_marked_bytes() { return _next_marked_bytes; } | |
| 3147 | |
|
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3148 // The original idea here was to coalesce evacuated and dead objects. |
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3149 // However that caused complications with the block offset table (BOT). |
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3150 // In particular if there were two TLABs, one of them partially refined. |
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3151 // |----- TLAB_1--------|----TLAB_2-~~~(partially refined part)~~~| |
|
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3152 // The BOT entries of the unrefined part of TLAB_2 point to the start |
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3153 // of TLAB_2. If the last object of the TLAB_1 and the first object |
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3154 // of TLAB_2 are coalesced, then the cards of the unrefined part |
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3155 // would point into middle of the filler object. |
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3156 // |
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3157 // The current approach is to not coalesce and leave the BOT contents intact. |
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3158 void do_object(oop obj) { |
|
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3159 if (obj->is_forwarded() && obj->forwardee() == obj) { |
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3160 // The object failed to move. |
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3161 assert(!_g1->is_obj_dead(obj), "We should not be preserving dead objs."); |
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3162 _cm->markPrev(obj); |
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3163 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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3164 _prev_marked_bytes += (obj->size() * HeapWordSize); |
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3165 if (_g1->mark_in_progress() && !_g1->is_obj_ill(obj)) { |
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3166 _cm->markAndGrayObjectIfNecessary(obj); |
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3167 } |
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3168 obj->set_mark(markOopDesc::prototype()); |
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3169 // While we were processing RSet buffers during the |
|
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3170 // collection, we actually didn't scan any cards on the |
|
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3171 // collection set, since we didn't want to update remebered |
|
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3172 // sets with entries that point into the collection set, given |
|
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3173 // that live objects fromthe collection set are about to move |
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3174 // and such entries will be stale very soon. This change also |
|
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3175 // dealt with a reliability issue which involved scanning a |
|
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3176 // card in the collection set and coming across an array that |
|
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3177 // was being chunked and looking malformed. The problem is |
|
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3178 // that, if evacuation fails, we might have remembered set |
|
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3179 // entries missing given that we skipped cards on the |
|
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3180 // collection set. So, we'll recreate such entries now. |
|
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3181 obj->oop_iterate(_cl); |
|
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3182 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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3183 } else { |
|
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3184 // The object has been either evacuated or is dead. Fill it with a |
|
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3185 // dummy object. |
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3186 MemRegion mr((HeapWord*)obj, obj->size()); |
|
481
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|
3187 CollectedHeap::fill_with_object(mr); |
| 342 | 3188 _cm->clearRangeBothMaps(mr); |
| 3189 } | |
| 3190 } | |
| 3191 }; | |
| 3192 | |
| 3193 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
|
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3194 UpdateRSetImmediate immediate_update(_g1h); |
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3195 DirtyCardQueue dcq(&_g1h->dirty_card_queue_set()); |
|
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3196 UpdateRSetDeferred deferred_update(_g1h, &dcq); |
|
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3197 OopsInHeapRegionClosure *cl; |
|
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3198 if (G1DeferredRSUpdate) { |
|
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3199 cl = &deferred_update; |
|
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3200 } else { |
|
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3201 cl = &immediate_update; |
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3202 } |
| 342 | 3203 HeapRegion* cur = g1_policy()->collection_set(); |
| 3204 while (cur != NULL) { | |
| 3205 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
| 3206 | |
|
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3207 RemoveSelfPointerClosure rspc(_g1h, cl); |
| 342 | 3208 if (cur->evacuation_failed()) { |
| 3209 assert(cur->in_collection_set(), "bad CS"); | |
|
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3210 cl->set_region(cur); |
| 342 | 3211 cur->object_iterate(&rspc); |
| 3212 | |
| 3213 // A number of manipulations to make the TAMS be the current top, | |
| 3214 // and the marked bytes be the ones observed in the iteration. | |
| 3215 if (_g1h->concurrent_mark()->at_least_one_mark_complete()) { | |
| 3216 // The comments below are the postconditions achieved by the | |
| 3217 // calls. Note especially the last such condition, which says that | |
| 3218 // the count of marked bytes has been properly restored. | |
| 3219 cur->note_start_of_marking(false); | |
| 3220 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
| 3221 cur->add_to_marked_bytes(rspc.prev_marked_bytes()); | |
| 3222 // _next_marked_bytes == prev_marked_bytes. | |
| 3223 cur->note_end_of_marking(); | |
| 3224 // _prev_top_at_mark_start == top(), | |
| 3225 // _prev_marked_bytes == prev_marked_bytes | |
| 3226 } | |
| 3227 // If there is no mark in progress, we modified the _next variables | |
| 3228 // above needlessly, but harmlessly. | |
| 3229 if (_g1h->mark_in_progress()) { | |
| 3230 cur->note_start_of_marking(false); | |
| 3231 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
| 3232 // _next_marked_bytes == next_marked_bytes. | |
| 3233 } | |
| 3234 | |
| 3235 // Now make sure the region has the right index in the sorted array. | |
| 3236 g1_policy()->note_change_in_marked_bytes(cur); | |
| 3237 } | |
| 3238 cur = cur->next_in_collection_set(); | |
| 3239 } | |
| 3240 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
| 3241 | |
| 3242 // Now restore saved marks, if any. | |
| 3243 if (_objs_with_preserved_marks != NULL) { | |
| 3244 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
| 3245 assert(_objs_with_preserved_marks->length() == | |
| 3246 _preserved_marks_of_objs->length(), "Both or none."); | |
| 3247 guarantee(_objs_with_preserved_marks->length() == | |
| 3248 _preserved_marks_of_objs->length(), "Both or none."); | |
| 3249 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
| 3250 oop obj = _objs_with_preserved_marks->at(i); | |
| 3251 markOop m = _preserved_marks_of_objs->at(i); | |
| 3252 obj->set_mark(m); | |
| 3253 } | |
| 3254 // Delete the preserved marks growable arrays (allocated on the C heap). | |
| 3255 delete _objs_with_preserved_marks; | |
| 3256 delete _preserved_marks_of_objs; | |
| 3257 _objs_with_preserved_marks = NULL; | |
| 3258 _preserved_marks_of_objs = NULL; | |
| 3259 } | |
| 3260 } | |
| 3261 | |
| 3262 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
| 3263 _evac_failure_scan_stack->push(obj); | |
| 3264 } | |
| 3265 | |
| 3266 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
| 3267 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
| 3268 | |
| 3269 while (_evac_failure_scan_stack->length() > 0) { | |
| 3270 oop obj = _evac_failure_scan_stack->pop(); | |
| 3271 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
| 3272 obj->oop_iterate_backwards(_evac_failure_closure); | |
| 3273 } | |
| 3274 } | |
| 3275 | |
| 3276 void G1CollectedHeap::handle_evacuation_failure(oop old) { | |
| 3277 markOop m = old->mark(); | |
| 3278 // forward to self | |
| 3279 assert(!old->is_forwarded(), "precondition"); | |
| 3280 | |
| 3281 old->forward_to(old); | |
| 3282 handle_evacuation_failure_common(old, m); | |
| 3283 } | |
| 3284 | |
| 3285 oop | |
| 3286 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
| 3287 oop old) { | |
| 3288 markOop m = old->mark(); | |
| 3289 oop forward_ptr = old->forward_to_atomic(old); | |
| 3290 if (forward_ptr == NULL) { | |
| 3291 // Forward-to-self succeeded. | |
| 3292 if (_evac_failure_closure != cl) { | |
| 3293 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
| 3294 assert(!_drain_in_progress, | |
| 3295 "Should only be true while someone holds the lock."); | |
| 3296 // Set the global evac-failure closure to the current thread's. | |
| 3297 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
| 3298 set_evac_failure_closure(cl); | |
| 3299 // Now do the common part. | |
| 3300 handle_evacuation_failure_common(old, m); | |
| 3301 // Reset to NULL. | |
| 3302 set_evac_failure_closure(NULL); | |
| 3303 } else { | |
| 3304 // The lock is already held, and this is recursive. | |
| 3305 assert(_drain_in_progress, "This should only be the recursive case."); | |
| 3306 handle_evacuation_failure_common(old, m); | |
| 3307 } | |
| 3308 return old; | |
| 3309 } else { | |
| 3310 // Someone else had a place to copy it. | |
| 3311 return forward_ptr; | |
| 3312 } | |
| 3313 } | |
| 3314 | |
| 3315 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
| 3316 set_evacuation_failed(true); | |
| 3317 | |
| 3318 preserve_mark_if_necessary(old, m); | |
| 3319 | |
| 3320 HeapRegion* r = heap_region_containing(old); | |
| 3321 if (!r->evacuation_failed()) { | |
| 3322 r->set_evacuation_failed(true); | |
| 3323 if (G1TraceRegions) { | |
| 3324 gclog_or_tty->print("evacuation failed in heap region "PTR_FORMAT" " | |
| 3325 "["PTR_FORMAT","PTR_FORMAT")\n", | |
| 3326 r, r->bottom(), r->end()); | |
| 3327 } | |
| 3328 } | |
| 3329 | |
| 3330 push_on_evac_failure_scan_stack(old); | |
| 3331 | |
| 3332 if (!_drain_in_progress) { | |
| 3333 // prevent recursion in copy_to_survivor_space() | |
| 3334 _drain_in_progress = true; | |
| 3335 drain_evac_failure_scan_stack(); | |
| 3336 _drain_in_progress = false; | |
| 3337 } | |
| 3338 } | |
| 3339 | |
| 3340 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
| 3341 if (m != markOopDesc::prototype()) { | |
| 3342 if (_objs_with_preserved_marks == NULL) { | |
| 3343 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
| 3344 _objs_with_preserved_marks = | |
| 3345 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 3346 _preserved_marks_of_objs = | |
| 3347 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
| 3348 } | |
| 3349 _objs_with_preserved_marks->push(obj); | |
| 3350 _preserved_marks_of_objs->push(m); | |
| 3351 } | |
| 3352 } | |
| 3353 | |
| 3354 // *** Parallel G1 Evacuation | |
| 3355 | |
| 3356 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
| 3357 size_t word_size) { | |
| 3358 HeapRegion* alloc_region = _gc_alloc_regions[purpose]; | |
| 3359 // let the caller handle alloc failure | |
| 3360 if (alloc_region == NULL) return NULL; | |
| 3361 | |
| 3362 HeapWord* block = alloc_region->par_allocate(word_size); | |
| 3363 if (block == NULL) { | |
| 3364 MutexLockerEx x(par_alloc_during_gc_lock(), | |
| 3365 Mutex::_no_safepoint_check_flag); | |
| 3366 block = allocate_during_gc_slow(purpose, alloc_region, true, word_size); | |
| 3367 } | |
| 3368 return block; | |
| 3369 } | |
| 3370 | |
| 545 | 3371 void G1CollectedHeap::retire_alloc_region(HeapRegion* alloc_region, |
| 3372 bool par) { | |
| 3373 // Another thread might have obtained alloc_region for the given | |
| 3374 // purpose, and might be attempting to allocate in it, and might | |
| 3375 // succeed. Therefore, we can't do the "finalization" stuff on the | |
| 3376 // region below until we're sure the last allocation has happened. | |
| 3377 // We ensure this by allocating the remaining space with a garbage | |
| 3378 // object. | |
| 3379 if (par) par_allocate_remaining_space(alloc_region); | |
| 3380 // Now we can do the post-GC stuff on the region. | |
| 3381 alloc_region->note_end_of_copying(); | |
| 3382 g1_policy()->record_after_bytes(alloc_region->used()); | |
| 3383 } | |
| 3384 | |
| 342 | 3385 HeapWord* |
| 3386 G1CollectedHeap::allocate_during_gc_slow(GCAllocPurpose purpose, | |
| 3387 HeapRegion* alloc_region, | |
| 3388 bool par, | |
| 3389 size_t word_size) { | |
| 3390 HeapWord* block = NULL; | |
| 3391 // In the parallel case, a previous thread to obtain the lock may have | |
| 3392 // already assigned a new gc_alloc_region. | |
| 3393 if (alloc_region != _gc_alloc_regions[purpose]) { | |
| 3394 assert(par, "But should only happen in parallel case."); | |
| 3395 alloc_region = _gc_alloc_regions[purpose]; | |
| 3396 if (alloc_region == NULL) return NULL; | |
| 3397 block = alloc_region->par_allocate(word_size); | |
| 3398 if (block != NULL) return block; | |
| 3399 // Otherwise, continue; this new region is empty, too. | |
| 3400 } | |
| 3401 assert(alloc_region != NULL, "We better have an allocation region"); | |
| 545 | 3402 retire_alloc_region(alloc_region, par); |
| 342 | 3403 |
| 3404 if (_gc_alloc_region_counts[purpose] >= g1_policy()->max_regions(purpose)) { | |
| 3405 // Cannot allocate more regions for the given purpose. | |
| 3406 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(purpose); | |
| 3407 // Is there an alternative? | |
| 3408 if (purpose != alt_purpose) { | |
| 3409 HeapRegion* alt_region = _gc_alloc_regions[alt_purpose]; | |
| 3410 // Has not the alternative region been aliased? | |
| 545 | 3411 if (alloc_region != alt_region && alt_region != NULL) { |
| 342 | 3412 // Try to allocate in the alternative region. |
| 3413 if (par) { | |
| 3414 block = alt_region->par_allocate(word_size); | |
| 3415 } else { | |
| 3416 block = alt_region->allocate(word_size); | |
| 3417 } | |
| 3418 // Make an alias. | |
| 3419 _gc_alloc_regions[purpose] = _gc_alloc_regions[alt_purpose]; | |
| 545 | 3420 if (block != NULL) { |
| 3421 return block; | |
| 3422 } | |
| 3423 retire_alloc_region(alt_region, par); | |
| 342 | 3424 } |
| 3425 // Both the allocation region and the alternative one are full | |
| 3426 // and aliased, replace them with a new allocation region. | |
| 3427 purpose = alt_purpose; | |
| 3428 } else { | |
| 3429 set_gc_alloc_region(purpose, NULL); | |
| 3430 return NULL; | |
| 3431 } | |
| 3432 } | |
| 3433 | |
| 3434 // Now allocate a new region for allocation. | |
| 3435 alloc_region = newAllocRegionWithExpansion(purpose, word_size, false /*zero_filled*/); | |
| 3436 | |
| 3437 // let the caller handle alloc failure | |
| 3438 if (alloc_region != NULL) { | |
| 3439 | |
| 3440 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
| 3441 assert(alloc_region->saved_mark_at_top(), | |
| 3442 "Mark should have been saved already."); | |
| 3443 // We used to assert that the region was zero-filled here, but no | |
| 3444 // longer. | |
| 3445 | |
| 3446 // This must be done last: once it's installed, other regions may | |
| 3447 // allocate in it (without holding the lock.) | |
| 3448 set_gc_alloc_region(purpose, alloc_region); | |
| 3449 | |
| 3450 if (par) { | |
| 3451 block = alloc_region->par_allocate(word_size); | |
| 3452 } else { | |
| 3453 block = alloc_region->allocate(word_size); | |
| 3454 } | |
| 3455 // Caller handles alloc failure. | |
| 3456 } else { | |
| 3457 // This sets other apis using the same old alloc region to NULL, also. | |
| 3458 set_gc_alloc_region(purpose, NULL); | |
| 3459 } | |
| 3460 return block; // May be NULL. | |
| 3461 } | |
| 3462 | |
| 3463 void G1CollectedHeap::par_allocate_remaining_space(HeapRegion* r) { | |
| 3464 HeapWord* block = NULL; | |
| 3465 size_t free_words; | |
| 3466 do { | |
| 3467 free_words = r->free()/HeapWordSize; | |
| 3468 // If there's too little space, no one can allocate, so we're done. | |
| 3469 if (free_words < (size_t)oopDesc::header_size()) return; | |
| 3470 // Otherwise, try to claim it. | |
| 3471 block = r->par_allocate(free_words); | |
| 3472 } while (block == NULL); | |
|
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changeset
|
3473 fill_with_object(block, free_words); |
| 342 | 3474 } |
| 3475 | |
| 3476 #define use_local_bitmaps 1 | |
| 3477 #define verify_local_bitmaps 0 | |
| 3478 | |
| 3479 #ifndef PRODUCT | |
| 3480 | |
| 3481 class GCLabBitMap; | |
| 3482 class GCLabBitMapClosure: public BitMapClosure { | |
| 3483 private: | |
| 3484 ConcurrentMark* _cm; | |
| 3485 GCLabBitMap* _bitmap; | |
| 3486 | |
| 3487 public: | |
| 3488 GCLabBitMapClosure(ConcurrentMark* cm, | |
| 3489 GCLabBitMap* bitmap) { | |
| 3490 _cm = cm; | |
| 3491 _bitmap = bitmap; | |
| 3492 } | |
| 3493 | |
| 3494 virtual bool do_bit(size_t offset); | |
| 3495 }; | |
| 3496 | |
| 3497 #endif // PRODUCT | |
| 3498 | |
| 3499 #define oop_buffer_length 256 | |
| 3500 | |
| 3501 class GCLabBitMap: public BitMap { | |
| 3502 private: | |
| 3503 ConcurrentMark* _cm; | |
| 3504 | |
| 3505 int _shifter; | |
| 3506 size_t _bitmap_word_covers_words; | |
| 3507 | |
| 3508 // beginning of the heap | |
| 3509 HeapWord* _heap_start; | |
| 3510 | |
| 3511 // this is the actual start of the GCLab | |
| 3512 HeapWord* _real_start_word; | |
| 3513 | |
| 3514 // this is the actual end of the GCLab | |
| 3515 HeapWord* _real_end_word; | |
| 3516 | |
| 3517 // this is the first word, possibly located before the actual start | |
| 3518 // of the GCLab, that corresponds to the first bit of the bitmap | |
| 3519 HeapWord* _start_word; | |
| 3520 | |
| 3521 // size of a GCLab in words | |
| 3522 size_t _gclab_word_size; | |
| 3523 | |
| 3524 static int shifter() { | |
| 3525 return MinObjAlignment - 1; | |
| 3526 } | |
| 3527 | |
| 3528 // how many heap words does a single bitmap word corresponds to? | |
| 3529 static size_t bitmap_word_covers_words() { | |
| 3530 return BitsPerWord << shifter(); | |
| 3531 } | |
| 3532 | |
| 3533 static size_t gclab_word_size() { | |
| 3534 return ParallelGCG1AllocBufferSize / HeapWordSize; | |
| 3535 } | |
| 3536 | |
| 3537 static size_t bitmap_size_in_bits() { | |
| 3538 size_t bits_in_bitmap = gclab_word_size() >> shifter(); | |
| 3539 // We are going to ensure that the beginning of a word in this | |
| 3540 // bitmap also corresponds to the beginning of a word in the | |
| 3541 // global marking bitmap. To handle the case where a GCLab | |
| 3542 // starts from the middle of the bitmap, we need to add enough | |
| 3543 // space (i.e. up to a bitmap word) to ensure that we have | |
| 3544 // enough bits in the bitmap. | |
| 3545 return bits_in_bitmap + BitsPerWord - 1; | |
| 3546 } | |
| 3547 public: | |
| 3548 GCLabBitMap(HeapWord* heap_start) | |
| 3549 : BitMap(bitmap_size_in_bits()), | |
| 3550 _cm(G1CollectedHeap::heap()->concurrent_mark()), | |
| 3551 _shifter(shifter()), | |
| 3552 _bitmap_word_covers_words(bitmap_word_covers_words()), | |
| 3553 _heap_start(heap_start), | |
| 3554 _gclab_word_size(gclab_word_size()), | |
| 3555 _real_start_word(NULL), | |
| 3556 _real_end_word(NULL), | |
| 3557 _start_word(NULL) | |
| 3558 { | |
| 3559 guarantee( size_in_words() >= bitmap_size_in_words(), | |
| 3560 "just making sure"); | |
| 3561 } | |
| 3562 | |
| 3563 inline unsigned heapWordToOffset(HeapWord* addr) { | |
| 3564 unsigned offset = (unsigned) pointer_delta(addr, _start_word) >> _shifter; | |
| 3565 assert(offset < size(), "offset should be within bounds"); | |
| 3566 return offset; | |
| 3567 } | |
| 3568 | |
| 3569 inline HeapWord* offsetToHeapWord(size_t offset) { | |
| 3570 HeapWord* addr = _start_word + (offset << _shifter); | |
| 3571 assert(_real_start_word <= addr && addr < _real_end_word, "invariant"); | |
| 3572 return addr; | |
| 3573 } | |
| 3574 | |
| 3575 bool fields_well_formed() { | |
| 3576 bool ret1 = (_real_start_word == NULL) && | |
| 3577 (_real_end_word == NULL) && | |
| 3578 (_start_word == NULL); | |
| 3579 if (ret1) | |
| 3580 return true; | |
| 3581 | |
| 3582 bool ret2 = _real_start_word >= _start_word && | |
| 3583 _start_word < _real_end_word && | |
| 3584 (_real_start_word + _gclab_word_size) == _real_end_word && | |
| 3585 (_start_word + _gclab_word_size + _bitmap_word_covers_words) | |
| 3586 > _real_end_word; | |
| 3587 return ret2; | |
| 3588 } | |
| 3589 | |
| 3590 inline bool mark(HeapWord* addr) { | |
| 3591 guarantee(use_local_bitmaps, "invariant"); | |
| 3592 assert(fields_well_formed(), "invariant"); | |
| 3593 | |
| 3594 if (addr >= _real_start_word && addr < _real_end_word) { | |
| 3595 assert(!isMarked(addr), "should not have already been marked"); | |
| 3596 | |
| 3597 // first mark it on the bitmap | |
| 3598 at_put(heapWordToOffset(addr), true); | |
| 3599 | |
| 3600 return true; | |
| 3601 } else { | |
| 3602 return false; | |
| 3603 } | |
| 3604 } | |
| 3605 | |
| 3606 inline bool isMarked(HeapWord* addr) { | |
| 3607 guarantee(use_local_bitmaps, "invariant"); | |
| 3608 assert(fields_well_formed(), "invariant"); | |
| 3609 | |
| 3610 return at(heapWordToOffset(addr)); | |
| 3611 } | |
| 3612 | |
| 3613 void set_buffer(HeapWord* start) { | |
| 3614 guarantee(use_local_bitmaps, "invariant"); | |
| 3615 clear(); | |
| 3616 | |
| 3617 assert(start != NULL, "invariant"); | |
| 3618 _real_start_word = start; | |
| 3619 _real_end_word = start + _gclab_word_size; | |
| 3620 | |
| 3621 size_t diff = | |
| 3622 pointer_delta(start, _heap_start) % _bitmap_word_covers_words; | |
| 3623 _start_word = start - diff; | |
| 3624 | |
| 3625 assert(fields_well_formed(), "invariant"); | |
| 3626 } | |
| 3627 | |
| 3628 #ifndef PRODUCT | |
| 3629 void verify() { | |
| 3630 // verify that the marks have been propagated | |
| 3631 GCLabBitMapClosure cl(_cm, this); | |
| 3632 iterate(&cl); | |
| 3633 } | |
| 3634 #endif // PRODUCT | |
| 3635 | |
| 3636 void retire() { | |
| 3637 guarantee(use_local_bitmaps, "invariant"); | |
| 3638 assert(fields_well_formed(), "invariant"); | |
| 3639 | |
| 3640 if (_start_word != NULL) { | |
| 3641 CMBitMap* mark_bitmap = _cm->nextMarkBitMap(); | |
| 3642 | |
| 3643 // this means that the bitmap was set up for the GCLab | |
| 3644 assert(_real_start_word != NULL && _real_end_word != NULL, "invariant"); | |
| 3645 | |
| 3646 mark_bitmap->mostly_disjoint_range_union(this, | |
| 3647 0, // always start from the start of the bitmap | |
| 3648 _start_word, | |
| 3649 size_in_words()); | |
| 3650 _cm->grayRegionIfNecessary(MemRegion(_real_start_word, _real_end_word)); | |
| 3651 | |
| 3652 #ifndef PRODUCT | |
| 3653 if (use_local_bitmaps && verify_local_bitmaps) | |
| 3654 verify(); | |
| 3655 #endif // PRODUCT | |
| 3656 } else { | |
| 3657 assert(_real_start_word == NULL && _real_end_word == NULL, "invariant"); | |
| 3658 } | |
| 3659 } | |
| 3660 | |
| 3661 static size_t bitmap_size_in_words() { | |
| 3662 return (bitmap_size_in_bits() + BitsPerWord - 1) / BitsPerWord; | |
| 3663 } | |
| 3664 }; | |
| 3665 | |
| 3666 #ifndef PRODUCT | |
| 3667 | |
| 3668 bool GCLabBitMapClosure::do_bit(size_t offset) { | |
| 3669 HeapWord* addr = _bitmap->offsetToHeapWord(offset); | |
| 3670 guarantee(_cm->isMarked(oop(addr)), "it should be!"); | |
| 3671 return true; | |
| 3672 } | |
| 3673 | |
| 3674 #endif // PRODUCT | |
| 3675 | |
| 3676 class G1ParGCAllocBuffer: public ParGCAllocBuffer { | |
| 3677 private: | |
| 3678 bool _retired; | |
| 3679 bool _during_marking; | |
| 3680 GCLabBitMap _bitmap; | |
| 3681 | |
| 3682 public: | |
| 3683 G1ParGCAllocBuffer() : | |
| 3684 ParGCAllocBuffer(ParallelGCG1AllocBufferSize / HeapWordSize), | |
| 3685 _during_marking(G1CollectedHeap::heap()->mark_in_progress()), | |
| 3686 _bitmap(G1CollectedHeap::heap()->reserved_region().start()), | |
| 3687 _retired(false) | |
| 3688 { } | |
| 3689 | |
| 3690 inline bool mark(HeapWord* addr) { | |
| 3691 guarantee(use_local_bitmaps, "invariant"); | |
| 3692 assert(_during_marking, "invariant"); | |
| 3693 return _bitmap.mark(addr); | |
| 3694 } | |
| 3695 | |
| 3696 inline void set_buf(HeapWord* buf) { | |
| 3697 if (use_local_bitmaps && _during_marking) | |
| 3698 _bitmap.set_buffer(buf); | |
| 3699 ParGCAllocBuffer::set_buf(buf); | |
| 3700 _retired = false; | |
| 3701 } | |
| 3702 | |
| 3703 inline void retire(bool end_of_gc, bool retain) { | |
| 3704 if (_retired) | |
| 3705 return; | |
| 3706 if (use_local_bitmaps && _during_marking) { | |
| 3707 _bitmap.retire(); | |
| 3708 } | |
| 3709 ParGCAllocBuffer::retire(end_of_gc, retain); | |
| 3710 _retired = true; | |
| 3711 } | |
| 3712 }; | |
| 3713 | |
| 3714 | |
| 3715 class G1ParScanThreadState : public StackObj { | |
| 3716 protected: | |
| 3717 G1CollectedHeap* _g1h; | |
| 3718 RefToScanQueue* _refs; | |
|
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3719 DirtyCardQueue _dcq; |
|
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diff
changeset
|
3720 CardTableModRefBS* _ct_bs; |
|
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|
3721 G1RemSet* _g1_rem; |
| 342 | 3722 |
| 3723 typedef GrowableArray<oop*> OverflowQueue; | |
| 3724 OverflowQueue* _overflowed_refs; | |
| 3725 | |
| 3726 G1ParGCAllocBuffer _alloc_buffers[GCAllocPurposeCount]; | |
| 545 | 3727 ageTable _age_table; |
| 342 | 3728 |
| 3729 size_t _alloc_buffer_waste; | |
| 3730 size_t _undo_waste; | |
| 3731 | |
| 3732 OopsInHeapRegionClosure* _evac_failure_cl; | |
| 3733 G1ParScanHeapEvacClosure* _evac_cl; | |
| 3734 G1ParScanPartialArrayClosure* _partial_scan_cl; | |
| 3735 | |
| 3736 int _hash_seed; | |
| 3737 int _queue_num; | |
| 3738 | |
| 3739 int _term_attempts; | |
| 3740 #if G1_DETAILED_STATS | |
| 3741 int _pushes, _pops, _steals, _steal_attempts; | |
| 3742 int _overflow_pushes; | |
| 3743 #endif | |
| 3744 | |
| 3745 double _start; | |
| 3746 double _start_strong_roots; | |
| 3747 double _strong_roots_time; | |
| 3748 double _start_term; | |
| 3749 double _term_time; | |
| 3750 | |
| 3751 // Map from young-age-index (0 == not young, 1 is youngest) to | |
| 3752 // surviving words. base is what we get back from the malloc call | |
| 3753 size_t* _surviving_young_words_base; | |
| 3754 // this points into the array, as we use the first few entries for padding | |
| 3755 size_t* _surviving_young_words; | |
| 3756 | |
| 3757 #define PADDING_ELEM_NUM (64 / sizeof(size_t)) | |
| 3758 | |
| 3759 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } | |
| 3760 | |
| 3761 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } | |
| 3762 | |
|
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diff
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|
3763 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
|
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595
diff
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|
3764 CardTableModRefBS* ctbs() { return _ct_bs; } |
|
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diff
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|
3765 |
|
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3766 void immediate_rs_update(HeapRegion* from, oop* p, int tid) { |
|
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3767 if (!from->is_survivor()) { |
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3768 _g1_rem->par_write_ref(from, p, tid); |
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3769 } |
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3770 } |
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3771 |
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3772 void deferred_rs_update(HeapRegion* from, oop* p, int tid) { |
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3773 // If the new value of the field points to the same region or |
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3774 // is the to-space, we don't need to include it in the Rset updates. |
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3775 if (!from->is_in_reserved(*p) && !from->is_survivor()) { |
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3776 size_t card_index = ctbs()->index_for(p); |
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3777 // If the card hasn't been added to the buffer, do it. |
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3778 if (ctbs()->mark_card_deferred(card_index)) { |
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3779 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
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3780 } |
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3781 } |
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3782 } |
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3783 |
| 342 | 3784 public: |
| 3785 G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) | |
| 3786 : _g1h(g1h), | |
| 3787 _refs(g1h->task_queue(queue_num)), | |
|
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3788 _dcq(&g1h->dirty_card_queue_set()), |
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3789 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
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3790 _g1_rem(g1h->g1_rem_set()), |
| 342 | 3791 _hash_seed(17), _queue_num(queue_num), |
| 3792 _term_attempts(0), | |
| 545 | 3793 _age_table(false), |
| 342 | 3794 #if G1_DETAILED_STATS |
| 3795 _pushes(0), _pops(0), _steals(0), | |
| 3796 _steal_attempts(0), _overflow_pushes(0), | |
| 3797 #endif | |
| 3798 _strong_roots_time(0), _term_time(0), | |
| 3799 _alloc_buffer_waste(0), _undo_waste(0) | |
| 3800 { | |
| 3801 // we allocate G1YoungSurvRateNumRegions plus one entries, since | |
| 3802 // we "sacrifice" entry 0 to keep track of surviving bytes for | |
| 3803 // non-young regions (where the age is -1) | |
| 3804 // We also add a few elements at the beginning and at the end in | |
| 3805 // an attempt to eliminate cache contention | |
| 3806 size_t real_length = 1 + _g1h->g1_policy()->young_cset_length(); | |
| 3807 size_t array_length = PADDING_ELEM_NUM + | |
| 3808 real_length + | |
| 3809 PADDING_ELEM_NUM; | |
| 3810 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); | |
| 3811 if (_surviving_young_words_base == NULL) | |
| 3812 vm_exit_out_of_memory(array_length * sizeof(size_t), | |
| 3813 "Not enough space for young surv histo."); | |
| 3814 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; | |
| 3815 memset(_surviving_young_words, 0, real_length * sizeof(size_t)); | |
| 3816 | |
| 3817 _overflowed_refs = new OverflowQueue(10); | |
| 3818 | |
| 3819 _start = os::elapsedTime(); | |
| 3820 } | |
| 3821 | |
| 3822 ~G1ParScanThreadState() { | |
| 3823 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base); | |
| 3824 } | |
| 3825 | |
| 3826 RefToScanQueue* refs() { return _refs; } | |
| 3827 OverflowQueue* overflowed_refs() { return _overflowed_refs; } | |
| 545 | 3828 ageTable* age_table() { return &_age_table; } |
| 3829 | |
| 3830 G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) { | |
| 342 | 3831 return &_alloc_buffers[purpose]; |
| 3832 } | |
| 3833 | |
| 3834 size_t alloc_buffer_waste() { return _alloc_buffer_waste; } | |
| 3835 size_t undo_waste() { return _undo_waste; } | |
| 3836 | |
| 3837 void push_on_queue(oop* ref) { | |
| 526 | 3838 assert(ref != NULL, "invariant"); |
| 3839 assert(has_partial_array_mask(ref) || _g1h->obj_in_cs(*ref), "invariant"); | |
| 3840 | |
| 342 | 3841 if (!refs()->push(ref)) { |
| 3842 overflowed_refs()->push(ref); | |
| 3843 IF_G1_DETAILED_STATS(note_overflow_push()); | |
| 3844 } else { | |
| 3845 IF_G1_DETAILED_STATS(note_push()); | |
| 3846 } | |
| 3847 } | |
| 3848 | |
| 3849 void pop_from_queue(oop*& ref) { | |
| 3850 if (!refs()->pop_local(ref)) { | |
| 3851 ref = NULL; | |
| 3852 } else { | |
| 526 | 3853 assert(ref != NULL, "invariant"); |
| 3854 assert(has_partial_array_mask(ref) || _g1h->obj_in_cs(*ref), | |
| 3855 "invariant"); | |
| 3856 | |
| 342 | 3857 IF_G1_DETAILED_STATS(note_pop()); |
| 3858 } | |
| 3859 } | |
| 3860 | |
| 3861 void pop_from_overflow_queue(oop*& ref) { | |
| 3862 ref = overflowed_refs()->pop(); | |
| 3863 } | |
| 3864 | |
| 3865 int refs_to_scan() { return refs()->size(); } | |
| 3866 int overflowed_refs_to_scan() { return overflowed_refs()->length(); } | |
| 3867 | |
|
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3868 void update_rs(HeapRegion* from, oop* p, int tid) { |
|
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3869 if (G1DeferredRSUpdate) { |
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3870 deferred_rs_update(from, p, tid); |
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3871 } else { |
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3872 immediate_rs_update(from, p, tid); |
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3873 } |
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3874 } |
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3875 |
| 342 | 3876 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
| 3877 | |
| 3878 HeapWord* obj = NULL; | |
| 3879 if (word_sz * 100 < | |
| 3880 (size_t)(ParallelGCG1AllocBufferSize / HeapWordSize) * | |
| 3881 ParallelGCBufferWastePct) { | |
| 3882 G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose); | |
| 3883 add_to_alloc_buffer_waste(alloc_buf->words_remaining()); | |
| 3884 alloc_buf->retire(false, false); | |
| 3885 | |
| 3886 HeapWord* buf = | |
| 3887 _g1h->par_allocate_during_gc(purpose, ParallelGCG1AllocBufferSize / HeapWordSize); | |
| 3888 if (buf == NULL) return NULL; // Let caller handle allocation failure. | |
| 3889 // Otherwise. | |
| 3890 alloc_buf->set_buf(buf); | |
| 3891 | |
| 3892 obj = alloc_buf->allocate(word_sz); | |
| 3893 assert(obj != NULL, "buffer was definitely big enough..."); | |
| 526 | 3894 } else { |
| 342 | 3895 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
| 3896 } | |
| 3897 return obj; | |
| 3898 } | |
| 3899 | |
| 3900 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { | |
| 3901 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); | |
| 3902 if (obj != NULL) return obj; | |
| 3903 return allocate_slow(purpose, word_sz); | |
| 3904 } | |
| 3905 | |
| 3906 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { | |
| 3907 if (alloc_buffer(purpose)->contains(obj)) { | |
| 3908 guarantee(alloc_buffer(purpose)->contains(obj + word_sz - 1), | |
| 3909 "should contain whole object"); | |
| 3910 alloc_buffer(purpose)->undo_allocation(obj, word_sz); | |
|
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3911 } else { |
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3912 CollectedHeap::fill_with_object(obj, word_sz); |
| 342 | 3913 add_to_undo_waste(word_sz); |
| 3914 } | |
| 3915 } | |
| 3916 | |
| 3917 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { | |
| 3918 _evac_failure_cl = evac_failure_cl; | |
| 3919 } | |
| 3920 OopsInHeapRegionClosure* evac_failure_closure() { | |
| 3921 return _evac_failure_cl; | |
| 3922 } | |
| 3923 | |
| 3924 void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) { | |
| 3925 _evac_cl = evac_cl; | |
| 3926 } | |
| 3927 | |
| 3928 void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) { | |
| 3929 _partial_scan_cl = partial_scan_cl; | |
| 3930 } | |
| 3931 | |
| 3932 int* hash_seed() { return &_hash_seed; } | |
| 3933 int queue_num() { return _queue_num; } | |
| 3934 | |
| 3935 int term_attempts() { return _term_attempts; } | |
| 3936 void note_term_attempt() { _term_attempts++; } | |
| 3937 | |
| 3938 #if G1_DETAILED_STATS | |
| 3939 int pushes() { return _pushes; } | |
| 3940 int pops() { return _pops; } | |
| 3941 int steals() { return _steals; } | |
| 3942 int steal_attempts() { return _steal_attempts; } | |
| 3943 int overflow_pushes() { return _overflow_pushes; } | |
| 3944 | |
| 3945 void note_push() { _pushes++; } | |
| 3946 void note_pop() { _pops++; } | |
| 3947 void note_steal() { _steals++; } | |
| 3948 void note_steal_attempt() { _steal_attempts++; } | |
| 3949 void note_overflow_push() { _overflow_pushes++; } | |
| 3950 #endif | |
| 3951 | |
| 3952 void start_strong_roots() { | |
| 3953 _start_strong_roots = os::elapsedTime(); | |
| 3954 } | |
| 3955 void end_strong_roots() { | |
| 3956 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); | |
| 3957 } | |
| 3958 double strong_roots_time() { return _strong_roots_time; } | |
| 3959 | |
| 3960 void start_term_time() { | |
| 3961 note_term_attempt(); | |
| 3962 _start_term = os::elapsedTime(); | |
| 3963 } | |
| 3964 void end_term_time() { | |
| 3965 _term_time += (os::elapsedTime() - _start_term); | |
| 3966 } | |
| 3967 double term_time() { return _term_time; } | |
| 3968 | |
| 3969 double elapsed() { | |
| 3970 return os::elapsedTime() - _start; | |
| 3971 } | |
| 3972 | |
| 3973 size_t* surviving_young_words() { | |
| 3974 // We add on to hide entry 0 which accumulates surviving words for | |
| 3975 // age -1 regions (i.e. non-young ones) | |
| 3976 return _surviving_young_words; | |
| 3977 } | |
| 3978 | |
| 3979 void retire_alloc_buffers() { | |
| 3980 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 3981 size_t waste = _alloc_buffers[ap].words_remaining(); | |
| 3982 add_to_alloc_buffer_waste(waste); | |
| 3983 _alloc_buffers[ap].retire(true, false); | |
| 3984 } | |
| 3985 } | |
| 3986 | |
| 526 | 3987 private: |
| 3988 void deal_with_reference(oop* ref_to_scan) { | |
| 3989 if (has_partial_array_mask(ref_to_scan)) { | |
| 3990 _partial_scan_cl->do_oop_nv(ref_to_scan); | |
| 3991 } else { | |
| 3992 // Note: we can use "raw" versions of "region_containing" because | |
| 3993 // "obj_to_scan" is definitely in the heap, and is not in a | |
| 3994 // humongous region. | |
| 3995 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); | |
| 3996 _evac_cl->set_region(r); | |
| 3997 _evac_cl->do_oop_nv(ref_to_scan); | |
| 3998 } | |
| 3999 } | |
| 4000 | |
| 4001 public: | |
| 342 | 4002 void trim_queue() { |
| 526 | 4003 // I've replicated the loop twice, first to drain the overflow |
| 4004 // queue, second to drain the task queue. This is better than | |
| 4005 // having a single loop, which checks both conditions and, inside | |
| 4006 // it, either pops the overflow queue or the task queue, as each | |
| 4007 // loop is tighter. Also, the decision to drain the overflow queue | |
| 4008 // first is not arbitrary, as the overflow queue is not visible | |
| 4009 // to the other workers, whereas the task queue is. So, we want to | |
| 4010 // drain the "invisible" entries first, while allowing the other | |
| 4011 // workers to potentially steal the "visible" entries. | |
| 4012 | |
| 342 | 4013 while (refs_to_scan() > 0 || overflowed_refs_to_scan() > 0) { |
| 526 | 4014 while (overflowed_refs_to_scan() > 0) { |
| 4015 oop *ref_to_scan = NULL; | |
| 342 | 4016 pop_from_overflow_queue(ref_to_scan); |
| 526 | 4017 assert(ref_to_scan != NULL, "invariant"); |
| 4018 // We shouldn't have pushed it on the queue if it was not | |
| 4019 // pointing into the CSet. | |
| 4020 assert(ref_to_scan != NULL, "sanity"); | |
| 4021 assert(has_partial_array_mask(ref_to_scan) || | |
| 4022 _g1h->obj_in_cs(*ref_to_scan), "sanity"); | |
| 4023 | |
| 4024 deal_with_reference(ref_to_scan); | |
| 342 | 4025 } |
| 526 | 4026 |
| 4027 while (refs_to_scan() > 0) { | |
| 4028 oop *ref_to_scan = NULL; | |
| 4029 pop_from_queue(ref_to_scan); | |
| 4030 | |
| 4031 if (ref_to_scan != NULL) { | |
| 4032 // We shouldn't have pushed it on the queue if it was not | |
| 4033 // pointing into the CSet. | |
| 4034 assert(has_partial_array_mask(ref_to_scan) || | |
| 4035 _g1h->obj_in_cs(*ref_to_scan), "sanity"); | |
| 4036 | |
| 4037 deal_with_reference(ref_to_scan); | |
| 342 | 4038 } |
| 4039 } | |
| 4040 } | |
| 4041 } | |
| 4042 }; | |
| 4043 | |
| 4044 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : | |
| 4045 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), | |
| 4046 _par_scan_state(par_scan_state) { } | |
| 4047 | |
| 4048 // This closure is applied to the fields of the objects that have just been copied. | |
| 4049 // Should probably be made inline and moved in g1OopClosures.inline.hpp. | |
| 4050 void G1ParScanClosure::do_oop_nv(oop* p) { | |
| 4051 oop obj = *p; | |
| 526 | 4052 |
| 342 | 4053 if (obj != NULL) { |
| 526 | 4054 if (_g1->in_cset_fast_test(obj)) { |
| 4055 // We're not going to even bother checking whether the object is | |
| 4056 // already forwarded or not, as this usually causes an immediate | |
| 4057 // stall. We'll try to prefetch the object (for write, given that | |
| 4058 // we might need to install the forwarding reference) and we'll | |
| 4059 // get back to it when pop it from the queue | |
| 4060 Prefetch::write(obj->mark_addr(), 0); | |
| 4061 Prefetch::read(obj->mark_addr(), (HeapWordSize*2)); | |
| 4062 | |
| 4063 // slightly paranoid test; I'm trying to catch potential | |
| 4064 // problems before we go into push_on_queue to know where the | |
| 4065 // problem is coming from | |
| 4066 assert(obj == *p, "the value of *p should not have changed"); | |
| 4067 _par_scan_state->push_on_queue(p); | |
| 4068 } else { | |
|
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4069 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 342 | 4070 } |
| 4071 } | |
| 4072 } | |
| 4073 | |
| 4074 void G1ParCopyHelper::mark_forwardee(oop* p) { | |
| 4075 // This is called _after_ do_oop_work has been called, hence after | |
| 4076 // the object has been relocated to its new location and *p points | |
| 4077 // to its new location. | |
| 4078 | |
| 4079 oop thisOop = *p; | |
| 4080 if (thisOop != NULL) { | |
| 4081 assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(thisOop)), | |
| 4082 "shouldn't still be in the CSet if evacuation didn't fail."); | |
| 4083 HeapWord* addr = (HeapWord*)thisOop; | |
| 4084 if (_g1->is_in_g1_reserved(addr)) | |
| 4085 _cm->grayRoot(oop(addr)); | |
| 4086 } | |
| 4087 } | |
| 4088 | |
| 4089 oop G1ParCopyHelper::copy_to_survivor_space(oop old) { | |
| 4090 size_t word_sz = old->size(); | |
| 4091 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
| 4092 // +1 to make the -1 indexes valid... | |
| 4093 int young_index = from_region->young_index_in_cset()+1; | |
| 4094 assert( (from_region->is_young() && young_index > 0) || | |
| 4095 (!from_region->is_young() && young_index == 0), "invariant" ); | |
| 4096 G1CollectorPolicy* g1p = _g1->g1_policy(); | |
| 4097 markOop m = old->mark(); | |
| 545 | 4098 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
| 4099 : m->age(); | |
| 4100 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
| 342 | 4101 word_sz); |
| 4102 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
| 4103 oop obj = oop(obj_ptr); | |
| 4104 | |
| 4105 if (obj_ptr == NULL) { | |
| 4106 // This will either forward-to-self, or detect that someone else has | |
| 4107 // installed a forwarding pointer. | |
| 4108 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
| 4109 return _g1->handle_evacuation_failure_par(cl, old); | |
| 4110 } | |
| 4111 | |
| 526 | 4112 // We're going to allocate linearly, so might as well prefetch ahead. |
| 4113 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
| 4114 | |
| 342 | 4115 oop forward_ptr = old->forward_to_atomic(obj); |
| 4116 if (forward_ptr == NULL) { | |
| 4117 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
| 526 | 4118 if (g1p->track_object_age(alloc_purpose)) { |
| 4119 // We could simply do obj->incr_age(). However, this causes a | |
| 4120 // performance issue. obj->incr_age() will first check whether | |
| 4121 // the object has a displaced mark by checking its mark word; | |
| 4122 // getting the mark word from the new location of the object | |
| 4123 // stalls. So, given that we already have the mark word and we | |
| 4124 // are about to install it anyway, it's better to increase the | |
| 4125 // age on the mark word, when the object does not have a | |
| 4126 // displaced mark word. We're not expecting many objects to have | |
| 4127 // a displaced marked word, so that case is not optimized | |
| 4128 // further (it could be...) and we simply call obj->incr_age(). | |
| 4129 | |
| 4130 if (m->has_displaced_mark_helper()) { | |
| 4131 // in this case, we have to install the mark word first, | |
| 4132 // otherwise obj looks to be forwarded (the old mark word, | |
| 4133 // which contains the forward pointer, was copied) | |
| 4134 obj->set_mark(m); | |
| 4135 obj->incr_age(); | |
| 4136 } else { | |
| 4137 m = m->incr_age(); | |
| 545 | 4138 obj->set_mark(m); |
| 526 | 4139 } |
| 545 | 4140 _par_scan_state->age_table()->add(obj, word_sz); |
| 4141 } else { | |
| 4142 obj->set_mark(m); | |
| 526 | 4143 } |
| 4144 | |
| 342 | 4145 // preserve "next" mark bit |
| 4146 if (_g1->mark_in_progress() && !_g1->is_obj_ill(old)) { | |
| 4147 if (!use_local_bitmaps || | |
| 4148 !_par_scan_state->alloc_buffer(alloc_purpose)->mark(obj_ptr)) { | |
| 4149 // if we couldn't mark it on the local bitmap (this happens when | |
| 4150 // the object was not allocated in the GCLab), we have to bite | |
| 4151 // the bullet and do the standard parallel mark | |
| 4152 _cm->markAndGrayObjectIfNecessary(obj); | |
| 4153 } | |
| 4154 #if 1 | |
| 4155 if (_g1->isMarkedNext(old)) { | |
| 4156 _cm->nextMarkBitMap()->parClear((HeapWord*)old); | |
| 4157 } | |
| 4158 #endif | |
| 4159 } | |
| 4160 | |
| 4161 size_t* surv_young_words = _par_scan_state->surviving_young_words(); | |
| 4162 surv_young_words[young_index] += word_sz; | |
| 4163 | |
| 4164 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
| 4165 arrayOop(old)->set_length(0); | |
| 526 | 4166 _par_scan_state->push_on_queue(set_partial_array_mask(old)); |
| 342 | 4167 } else { |
| 526 | 4168 // No point in using the slower heap_region_containing() method, |
| 4169 // given that we know obj is in the heap. | |
| 4170 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
| 342 | 4171 obj->oop_iterate_backwards(_scanner); |
| 4172 } | |
| 4173 } else { | |
| 4174 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
| 4175 obj = forward_ptr; | |
| 4176 } | |
| 4177 return obj; | |
| 4178 } | |
| 4179 | |
| 526 | 4180 template<bool do_gen_barrier, G1Barrier barrier, |
| 4181 bool do_mark_forwardee, bool skip_cset_test> | |
| 4182 void G1ParCopyClosure<do_gen_barrier, barrier, | |
| 4183 do_mark_forwardee, skip_cset_test>::do_oop_work(oop* p) { | |
| 342 | 4184 oop obj = *p; |
| 4185 assert(barrier != G1BarrierRS || obj != NULL, | |
| 4186 "Precondition: G1BarrierRS implies obj is nonNull"); | |
| 4187 | |
| 526 | 4188 // The only time we skip the cset test is when we're scanning |
| 4189 // references popped from the queue. And we only push on the queue | |
| 4190 // references that we know point into the cset, so no point in | |
| 4191 // checking again. But we'll leave an assert here for peace of mind. | |
| 4192 assert(!skip_cset_test || _g1->obj_in_cs(obj), "invariant"); | |
| 4193 | |
| 4194 // here the null check is implicit in the cset_fast_test() test | |
| 4195 if (skip_cset_test || _g1->in_cset_fast_test(obj)) { | |
| 342 | 4196 #if G1_REM_SET_LOGGING |
| 526 | 4197 gclog_or_tty->print_cr("Loc "PTR_FORMAT" contains pointer "PTR_FORMAT" " |
| 4198 "into CS.", p, (void*) obj); | |
| 342 | 4199 #endif |
| 526 | 4200 if (obj->is_forwarded()) { |
| 4201 *p = obj->forwardee(); | |
| 4202 } else { | |
| 4203 *p = copy_to_survivor_space(obj); | |
| 342 | 4204 } |
| 526 | 4205 // When scanning the RS, we only care about objs in CS. |
| 4206 if (barrier == G1BarrierRS) { | |
|
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4207 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 342 | 4208 } |
| 526 | 4209 } |
| 4210 | |
| 4211 // When scanning moved objs, must look at all oops. | |
| 4212 if (barrier == G1BarrierEvac && obj != NULL) { | |
|
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4213 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 526 | 4214 } |
| 4215 | |
| 4216 if (do_gen_barrier && obj != NULL) { | |
| 4217 par_do_barrier(p); | |
| 4218 } | |
| 4219 } | |
| 4220 | |
| 4221 template void G1ParCopyClosure<false, G1BarrierEvac, false, true>::do_oop_work(oop* p); | |
| 4222 | |
| 4223 template<class T> void G1ParScanPartialArrayClosure::process_array_chunk( | |
| 342 | 4224 oop obj, int start, int end) { |
| 4225 // process our set of indices (include header in first chunk) | |
| 4226 assert(start < end, "invariant"); | |
| 4227 T* const base = (T*)objArrayOop(obj)->base(); | |
| 526 | 4228 T* const start_addr = (start == 0) ? (T*) obj : base + start; |
| 342 | 4229 T* const end_addr = base + end; |
| 4230 MemRegion mr((HeapWord*)start_addr, (HeapWord*)end_addr); | |
| 4231 _scanner.set_region(_g1->heap_region_containing(obj)); | |
| 4232 obj->oop_iterate(&_scanner, mr); | |
| 4233 } | |
| 4234 | |
| 4235 void G1ParScanPartialArrayClosure::do_oop_nv(oop* p) { | |
| 4236 assert(!UseCompressedOops, "Needs to be fixed to work with compressed oops"); | |
| 526 | 4237 assert(has_partial_array_mask(p), "invariant"); |
| 4238 oop old = clear_partial_array_mask(p); | |
| 342 | 4239 assert(old->is_objArray(), "must be obj array"); |
| 4240 assert(old->is_forwarded(), "must be forwarded"); | |
| 4241 assert(Universe::heap()->is_in_reserved(old), "must be in heap."); | |
| 4242 | |
| 4243 objArrayOop obj = objArrayOop(old->forwardee()); | |
| 4244 assert((void*)old != (void*)old->forwardee(), "self forwarding here?"); | |
| 4245 // Process ParGCArrayScanChunk elements now | |
| 4246 // and push the remainder back onto queue | |
| 4247 int start = arrayOop(old)->length(); | |
| 4248 int end = obj->length(); | |
| 4249 int remainder = end - start; | |
| 4250 assert(start <= end, "just checking"); | |
| 4251 if (remainder > 2 * ParGCArrayScanChunk) { | |
| 4252 // Test above combines last partial chunk with a full chunk | |
| 4253 end = start + ParGCArrayScanChunk; | |
| 4254 arrayOop(old)->set_length(end); | |
| 4255 // Push remainder. | |
| 526 | 4256 _par_scan_state->push_on_queue(set_partial_array_mask(old)); |
| 342 | 4257 } else { |
| 4258 // Restore length so that the heap remains parsable in | |
| 4259 // case of evacuation failure. | |
| 4260 arrayOop(old)->set_length(end); | |
| 4261 } | |
| 4262 | |
| 4263 // process our set of indices (include header in first chunk) | |
| 4264 process_array_chunk<oop>(obj, start, end); | |
| 4265 } | |
| 4266 | |
| 4267 int G1ScanAndBalanceClosure::_nq = 0; | |
| 4268 | |
| 4269 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
| 4270 protected: | |
| 4271 G1CollectedHeap* _g1h; | |
| 4272 G1ParScanThreadState* _par_scan_state; | |
| 4273 RefToScanQueueSet* _queues; | |
| 4274 ParallelTaskTerminator* _terminator; | |
| 4275 | |
| 4276 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
| 4277 RefToScanQueueSet* queues() { return _queues; } | |
| 4278 ParallelTaskTerminator* terminator() { return _terminator; } | |
| 4279 | |
| 4280 public: | |
| 4281 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
| 4282 G1ParScanThreadState* par_scan_state, | |
| 4283 RefToScanQueueSet* queues, | |
| 4284 ParallelTaskTerminator* terminator) | |
| 4285 : _g1h(g1h), _par_scan_state(par_scan_state), | |
| 4286 _queues(queues), _terminator(terminator) {} | |
| 4287 | |
| 4288 void do_void() { | |
| 4289 G1ParScanThreadState* pss = par_scan_state(); | |
| 4290 while (true) { | |
| 4291 oop* ref_to_scan; | |
| 4292 pss->trim_queue(); | |
| 4293 IF_G1_DETAILED_STATS(pss->note_steal_attempt()); | |
| 4294 if (queues()->steal(pss->queue_num(), | |
| 4295 pss->hash_seed(), | |
| 4296 ref_to_scan)) { | |
| 4297 IF_G1_DETAILED_STATS(pss->note_steal()); | |
| 526 | 4298 |
| 4299 // slightly paranoid tests; I'm trying to catch potential | |
| 4300 // problems before we go into push_on_queue to know where the | |
| 4301 // problem is coming from | |
| 4302 assert(ref_to_scan != NULL, "invariant"); | |
| 4303 assert(has_partial_array_mask(ref_to_scan) || | |
| 4304 _g1h->obj_in_cs(*ref_to_scan), "invariant"); | |
| 342 | 4305 pss->push_on_queue(ref_to_scan); |
| 4306 continue; | |
| 4307 } | |
| 4308 pss->start_term_time(); | |
| 4309 if (terminator()->offer_termination()) break; | |
| 4310 pss->end_term_time(); | |
| 4311 } | |
| 4312 pss->end_term_time(); | |
| 4313 pss->retire_alloc_buffers(); | |
| 4314 } | |
| 4315 }; | |
| 4316 | |
| 4317 class G1ParTask : public AbstractGangTask { | |
| 4318 protected: | |
| 4319 G1CollectedHeap* _g1h; | |
| 4320 RefToScanQueueSet *_queues; | |
| 4321 ParallelTaskTerminator _terminator; | |
| 4322 | |
| 4323 Mutex _stats_lock; | |
| 4324 Mutex* stats_lock() { return &_stats_lock; } | |
| 4325 | |
| 4326 size_t getNCards() { | |
| 4327 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
| 4328 / G1BlockOffsetSharedArray::N_bytes; | |
| 4329 } | |
| 4330 | |
| 4331 public: | |
| 4332 G1ParTask(G1CollectedHeap* g1h, int workers, RefToScanQueueSet *task_queues) | |
| 4333 : AbstractGangTask("G1 collection"), | |
| 4334 _g1h(g1h), | |
| 4335 _queues(task_queues), | |
| 4336 _terminator(workers, _queues), | |
| 4337 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true) | |
| 4338 {} | |
| 4339 | |
| 4340 RefToScanQueueSet* queues() { return _queues; } | |
| 4341 | |
| 4342 RefToScanQueue *work_queue(int i) { | |
| 4343 return queues()->queue(i); | |
| 4344 } | |
| 4345 | |
| 4346 void work(int i) { | |
| 4347 ResourceMark rm; | |
| 4348 HandleMark hm; | |
| 4349 | |
| 526 | 4350 G1ParScanThreadState pss(_g1h, i); |
| 4351 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss); | |
| 4352 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss); | |
| 4353 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss); | |
| 342 | 4354 |
| 4355 pss.set_evac_closure(&scan_evac_cl); | |
| 4356 pss.set_evac_failure_closure(&evac_failure_cl); | |
| 4357 pss.set_partial_scan_closure(&partial_scan_cl); | |
| 4358 | |
| 4359 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss); | |
| 4360 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss); | |
| 4361 G1ParScanHeapRSClosure only_scan_heap_rs_cl(_g1h, &pss); | |
|
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|
4362 |
| 342 | 4363 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss); |
| 4364 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss); | |
| 4365 G1ParScanAndMarkHeapRSClosure scan_mark_heap_rs_cl(_g1h, &pss); | |
| 4366 | |
| 4367 OopsInHeapRegionClosure *scan_root_cl; | |
| 4368 OopsInHeapRegionClosure *scan_perm_cl; | |
| 4369 OopsInHeapRegionClosure *scan_so_cl; | |
| 4370 | |
| 4371 if (_g1h->g1_policy()->should_initiate_conc_mark()) { | |
| 4372 scan_root_cl = &scan_mark_root_cl; | |
| 4373 scan_perm_cl = &scan_mark_perm_cl; | |
| 4374 scan_so_cl = &scan_mark_heap_rs_cl; | |
| 4375 } else { | |
| 4376 scan_root_cl = &only_scan_root_cl; | |
| 4377 scan_perm_cl = &only_scan_perm_cl; | |
| 4378 scan_so_cl = &only_scan_heap_rs_cl; | |
| 4379 } | |
| 4380 | |
| 4381 pss.start_strong_roots(); | |
| 4382 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
| 4383 SharedHeap::SO_AllClasses, | |
| 4384 scan_root_cl, | |
| 4385 &only_scan_heap_rs_cl, | |
| 4386 scan_so_cl, | |
| 4387 scan_perm_cl, | |
| 4388 i); | |
| 4389 pss.end_strong_roots(); | |
| 4390 { | |
| 4391 double start = os::elapsedTime(); | |
| 4392 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
| 4393 evac.do_void(); | |
| 4394 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
| 4395 double term_ms = pss.term_time()*1000.0; | |
| 4396 _g1h->g1_policy()->record_obj_copy_time(i, elapsed_ms-term_ms); | |
| 4397 _g1h->g1_policy()->record_termination_time(i, term_ms); | |
| 4398 } | |
| 545 | 4399 if (G1UseSurvivorSpace) { |
| 4400 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); | |
| 4401 } | |
| 342 | 4402 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
| 4403 | |
| 4404 // Clean up any par-expanded rem sets. | |
| 4405 HeapRegionRemSet::par_cleanup(); | |
| 4406 | |
| 4407 MutexLocker x(stats_lock()); | |
| 4408 if (ParallelGCVerbose) { | |
| 4409 gclog_or_tty->print("Thread %d complete:\n", i); | |
| 4410 #if G1_DETAILED_STATS | |
| 4411 gclog_or_tty->print(" Pushes: %7d Pops: %7d Overflows: %7d Steals %7d (in %d attempts)\n", | |
| 4412 pss.pushes(), | |
| 4413 pss.pops(), | |
| 4414 pss.overflow_pushes(), | |
| 4415 pss.steals(), | |
| 4416 pss.steal_attempts()); | |
| 4417 #endif | |
| 4418 double elapsed = pss.elapsed(); | |
| 4419 double strong_roots = pss.strong_roots_time(); | |
| 4420 double term = pss.term_time(); | |
| 4421 gclog_or_tty->print(" Elapsed: %7.2f ms.\n" | |
| 4422 " Strong roots: %7.2f ms (%6.2f%%)\n" | |
| 4423 " Termination: %7.2f ms (%6.2f%%) (in %d entries)\n", | |
| 4424 elapsed * 1000.0, | |
| 4425 strong_roots * 1000.0, (strong_roots*100.0/elapsed), | |
| 4426 term * 1000.0, (term*100.0/elapsed), | |
| 4427 pss.term_attempts()); | |
| 4428 size_t total_waste = pss.alloc_buffer_waste() + pss.undo_waste(); | |
| 4429 gclog_or_tty->print(" Waste: %8dK\n" | |
| 4430 " Alloc Buffer: %8dK\n" | |
| 4431 " Undo: %8dK\n", | |
| 4432 (total_waste * HeapWordSize) / K, | |
| 4433 (pss.alloc_buffer_waste() * HeapWordSize) / K, | |
| 4434 (pss.undo_waste() * HeapWordSize) / K); | |
| 4435 } | |
| 4436 | |
| 4437 assert(pss.refs_to_scan() == 0, "Task queue should be empty"); | |
| 4438 assert(pss.overflowed_refs_to_scan() == 0, "Overflow queue should be empty"); | |
| 4439 } | |
| 4440 }; | |
| 4441 | |
| 4442 // *** Common G1 Evacuation Stuff | |
| 4443 | |
| 4444 class G1CountClosure: public OopsInHeapRegionClosure { | |
| 4445 public: | |
| 4446 int n; | |
| 4447 G1CountClosure() : n(0) {} | |
| 4448 void do_oop(narrowOop* p) { | |
| 4449 guarantee(false, "NYI"); | |
| 4450 } | |
| 4451 void do_oop(oop* p) { | |
| 4452 oop obj = *p; | |
| 4453 assert(obj != NULL && G1CollectedHeap::heap()->obj_in_cs(obj), | |
| 4454 "Rem set closure called on non-rem-set pointer."); | |
| 4455 n++; | |
| 4456 } | |
| 4457 }; | |
| 4458 | |
| 4459 static G1CountClosure count_closure; | |
| 4460 | |
| 4461 void | |
| 4462 G1CollectedHeap:: | |
| 4463 g1_process_strong_roots(bool collecting_perm_gen, | |
| 4464 SharedHeap::ScanningOption so, | |
| 4465 OopClosure* scan_non_heap_roots, | |
| 4466 OopsInHeapRegionClosure* scan_rs, | |
| 4467 OopsInHeapRegionClosure* scan_so, | |
| 4468 OopsInGenClosure* scan_perm, | |
| 4469 int worker_i) { | |
| 4470 // First scan the strong roots, including the perm gen. | |
| 4471 double ext_roots_start = os::elapsedTime(); | |
| 4472 double closure_app_time_sec = 0.0; | |
| 4473 | |
| 4474 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
| 4475 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
| 4476 buf_scan_perm.set_generation(perm_gen()); | |
| 4477 | |
| 4478 process_strong_roots(collecting_perm_gen, so, | |
| 4479 &buf_scan_non_heap_roots, | |
| 4480 &buf_scan_perm); | |
| 4481 // Finish up any enqueued closure apps. | |
| 4482 buf_scan_non_heap_roots.done(); | |
| 4483 buf_scan_perm.done(); | |
| 4484 double ext_roots_end = os::elapsedTime(); | |
| 4485 g1_policy()->reset_obj_copy_time(worker_i); | |
| 4486 double obj_copy_time_sec = | |
| 4487 buf_scan_non_heap_roots.closure_app_seconds() + | |
| 4488 buf_scan_perm.closure_app_seconds(); | |
| 4489 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); | |
| 4490 double ext_root_time_ms = | |
| 4491 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
| 4492 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); | |
| 4493 | |
| 4494 // Scan strong roots in mark stack. | |
| 4495 if (!_process_strong_tasks->is_task_claimed(G1H_PS_mark_stack_oops_do)) { | |
| 4496 concurrent_mark()->oops_do(scan_non_heap_roots); | |
| 4497 } | |
| 4498 double mark_stack_scan_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; | |
| 4499 g1_policy()->record_mark_stack_scan_time(worker_i, mark_stack_scan_ms); | |
| 4500 | |
| 4501 // XXX What should this be doing in the parallel case? | |
| 4502 g1_policy()->record_collection_pause_end_CH_strong_roots(); | |
| 4503 if (G1VerifyRemSet) { | |
| 4504 // :::: FIXME :::: | |
| 4505 // The stupid remembered set doesn't know how to filter out dead | |
| 4506 // objects, which the smart one does, and so when it is created | |
| 4507 // and then compared the number of entries in each differs and | |
| 4508 // the verification code fails. | |
| 4509 guarantee(false, "verification code is broken, see note"); | |
| 4510 | |
| 4511 // Let's make sure that the current rem set agrees with the stupidest | |
| 4512 // one possible! | |
| 4513 bool refs_enabled = ref_processor()->discovery_enabled(); | |
| 4514 if (refs_enabled) ref_processor()->disable_discovery(); | |
| 4515 StupidG1RemSet stupid(this); | |
| 4516 count_closure.n = 0; | |
| 4517 stupid.oops_into_collection_set_do(&count_closure, worker_i); | |
| 4518 int stupid_n = count_closure.n; | |
| 4519 count_closure.n = 0; | |
| 4520 g1_rem_set()->oops_into_collection_set_do(&count_closure, worker_i); | |
| 4521 guarantee(count_closure.n == stupid_n, "Old and new rem sets differ."); | |
| 4522 gclog_or_tty->print_cr("\nFound %d pointers in heap RS.", count_closure.n); | |
| 4523 if (refs_enabled) ref_processor()->enable_discovery(); | |
| 4524 } | |
| 4525 if (scan_so != NULL) { | |
| 4526 scan_scan_only_set(scan_so, worker_i); | |
| 4527 } | |
| 4528 // Now scan the complement of the collection set. | |
| 4529 if (scan_rs != NULL) { | |
| 4530 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
| 4531 } | |
| 4532 // Finish with the ref_processor roots. | |
| 4533 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { | |
| 4534 ref_processor()->oops_do(scan_non_heap_roots); | |
| 4535 } | |
| 4536 g1_policy()->record_collection_pause_end_G1_strong_roots(); | |
| 4537 _process_strong_tasks->all_tasks_completed(); | |
| 4538 } | |
| 4539 | |
| 4540 void | |
| 4541 G1CollectedHeap::scan_scan_only_region(HeapRegion* r, | |
| 4542 OopsInHeapRegionClosure* oc, | |
| 4543 int worker_i) { | |
| 4544 HeapWord* startAddr = r->bottom(); | |
| 4545 HeapWord* endAddr = r->used_region().end(); | |
| 4546 | |
| 4547 oc->set_region(r); | |
| 4548 | |
| 4549 HeapWord* p = r->bottom(); | |
| 4550 HeapWord* t = r->top(); | |
| 4551 guarantee( p == r->next_top_at_mark_start(), "invariant" ); | |
| 4552 while (p < t) { | |
| 4553 oop obj = oop(p); | |
| 4554 p += obj->oop_iterate(oc); | |
| 4555 } | |
| 4556 } | |
| 4557 | |
| 4558 void | |
| 4559 G1CollectedHeap::scan_scan_only_set(OopsInHeapRegionClosure* oc, | |
| 4560 int worker_i) { | |
| 4561 double start = os::elapsedTime(); | |
| 4562 | |
| 4563 BufferingOopsInHeapRegionClosure boc(oc); | |
| 4564 | |
| 4565 FilterInHeapRegionAndIntoCSClosure scan_only(this, &boc); | |
| 4566 FilterAndMarkInHeapRegionAndIntoCSClosure scan_and_mark(this, &boc, concurrent_mark()); | |
| 4567 | |
| 4568 OopsInHeapRegionClosure *foc; | |
| 4569 if (g1_policy()->should_initiate_conc_mark()) | |
| 4570 foc = &scan_and_mark; | |
| 4571 else | |
| 4572 foc = &scan_only; | |
| 4573 | |
| 4574 HeapRegion* hr; | |
| 4575 int n = 0; | |
| 4576 while ((hr = _young_list->par_get_next_scan_only_region()) != NULL) { | |
| 4577 scan_scan_only_region(hr, foc, worker_i); | |
| 4578 ++n; | |
| 4579 } | |
| 4580 boc.done(); | |
| 4581 | |
| 4582 double closure_app_s = boc.closure_app_seconds(); | |
| 4583 g1_policy()->record_obj_copy_time(worker_i, closure_app_s * 1000.0); | |
| 4584 double ms = (os::elapsedTime() - start - closure_app_s)*1000.0; | |
| 4585 g1_policy()->record_scan_only_time(worker_i, ms, n); | |
| 4586 } | |
| 4587 | |
| 4588 void | |
| 4589 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
| 4590 OopClosure* non_root_closure) { | |
| 4591 SharedHeap::process_weak_roots(root_closure, non_root_closure); | |
| 4592 } | |
| 4593 | |
| 4594 | |
| 4595 class SaveMarksClosure: public HeapRegionClosure { | |
| 4596 public: | |
| 4597 bool doHeapRegion(HeapRegion* r) { | |
| 4598 r->save_marks(); | |
| 4599 return false; | |
| 4600 } | |
| 4601 }; | |
| 4602 | |
| 4603 void G1CollectedHeap::save_marks() { | |
| 4604 if (ParallelGCThreads == 0) { | |
| 4605 SaveMarksClosure sm; | |
| 4606 heap_region_iterate(&sm); | |
| 4607 } | |
| 4608 // We do this even in the parallel case | |
| 4609 perm_gen()->save_marks(); | |
| 4610 } | |
| 4611 | |
| 4612 void G1CollectedHeap::evacuate_collection_set() { | |
| 4613 set_evacuation_failed(false); | |
| 4614 | |
| 4615 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
| 4616 concurrent_g1_refine()->set_use_cache(false); | |
| 4617 int n_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); | |
| 4618 set_par_threads(n_workers); | |
| 4619 G1ParTask g1_par_task(this, n_workers, _task_queues); | |
| 4620 | |
| 4621 init_for_evac_failure(NULL); | |
| 4622 | |
| 4623 change_strong_roots_parity(); // In preparation for parallel strong roots. | |
| 4624 rem_set()->prepare_for_younger_refs_iterate(true); | |
|
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4625 |
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4626 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
| 342 | 4627 double start_par = os::elapsedTime(); |
| 4628 if (ParallelGCThreads > 0) { | |
| 4629 // The individual threads will set their evac-failure closures. | |
| 4630 workers()->run_task(&g1_par_task); | |
| 4631 } else { | |
| 4632 g1_par_task.work(0); | |
| 4633 } | |
| 4634 | |
| 4635 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
| 4636 g1_policy()->record_par_time(par_time); | |
| 4637 set_par_threads(0); | |
| 4638 // Is this the right thing to do here? We don't save marks | |
| 4639 // on individual heap regions when we allocate from | |
| 4640 // them in parallel, so this seems like the correct place for this. | |
| 545 | 4641 retire_all_alloc_regions(); |
| 342 | 4642 { |
| 4643 G1IsAliveClosure is_alive(this); | |
| 4644 G1KeepAliveClosure keep_alive(this); | |
| 4645 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
| 4646 } | |
| 4647 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); | |
|
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4648 |
| 342 | 4649 concurrent_g1_refine()->set_use_cache(true); |
| 4650 | |
| 4651 finalize_for_evac_failure(); | |
| 4652 | |
| 4653 // Must do this before removing self-forwarding pointers, which clears | |
| 4654 // the per-region evac-failure flags. | |
| 4655 concurrent_mark()->complete_marking_in_collection_set(); | |
| 4656 | |
| 4657 if (evacuation_failed()) { | |
| 4658 remove_self_forwarding_pointers(); | |
| 4659 if (PrintGCDetails) { | |
| 4660 gclog_or_tty->print(" (evacuation failed)"); | |
| 4661 } else if (PrintGC) { | |
| 4662 gclog_or_tty->print("--"); | |
| 4663 } | |
| 4664 } | |
| 4665 | |
|
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4666 if (G1DeferredRSUpdate) { |
|
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4667 RedirtyLoggedCardTableEntryFastClosure redirty; |
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4668 dirty_card_queue_set().set_closure(&redirty); |
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4669 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
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4670 JavaThread::dirty_card_queue_set().merge_bufferlists(&dirty_card_queue_set()); |
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4671 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
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4672 } |
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|
4673 |
| 342 | 4674 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
| 4675 } | |
| 4676 | |
| 4677 void G1CollectedHeap::free_region(HeapRegion* hr) { | |
| 4678 size_t pre_used = 0; | |
| 4679 size_t cleared_h_regions = 0; | |
| 4680 size_t freed_regions = 0; | |
| 4681 UncleanRegionList local_list; | |
| 4682 | |
| 4683 HeapWord* start = hr->bottom(); | |
| 4684 HeapWord* end = hr->prev_top_at_mark_start(); | |
| 4685 size_t used_bytes = hr->used(); | |
| 4686 size_t live_bytes = hr->max_live_bytes(); | |
| 4687 if (used_bytes > 0) { | |
| 4688 guarantee( live_bytes <= used_bytes, "invariant" ); | |
| 4689 } else { | |
| 4690 guarantee( live_bytes == 0, "invariant" ); | |
| 4691 } | |
| 4692 | |
| 4693 size_t garbage_bytes = used_bytes - live_bytes; | |
| 4694 if (garbage_bytes > 0) | |
| 4695 g1_policy()->decrease_known_garbage_bytes(garbage_bytes); | |
| 4696 | |
| 4697 free_region_work(hr, pre_used, cleared_h_regions, freed_regions, | |
| 4698 &local_list); | |
| 4699 finish_free_region_work(pre_used, cleared_h_regions, freed_regions, | |
| 4700 &local_list); | |
| 4701 } | |
| 4702 | |
| 4703 void | |
| 4704 G1CollectedHeap::free_region_work(HeapRegion* hr, | |
| 4705 size_t& pre_used, | |
| 4706 size_t& cleared_h_regions, | |
| 4707 size_t& freed_regions, | |
| 4708 UncleanRegionList* list, | |
| 4709 bool par) { | |
| 4710 assert(!hr->popular(), "should not free popular regions"); | |
| 4711 pre_used += hr->used(); | |
| 4712 if (hr->isHumongous()) { | |
| 4713 assert(hr->startsHumongous(), | |
| 4714 "Only the start of a humongous region should be freed."); | |
| 4715 int ind = _hrs->find(hr); | |
| 4716 assert(ind != -1, "Should have an index."); | |
| 4717 // Clear the start region. | |
| 4718 hr->hr_clear(par, true /*clear_space*/); | |
| 4719 list->insert_before_head(hr); | |
| 4720 cleared_h_regions++; | |
| 4721 freed_regions++; | |
| 4722 // Clear any continued regions. | |
| 4723 ind++; | |
| 4724 while ((size_t)ind < n_regions()) { | |
| 4725 HeapRegion* hrc = _hrs->at(ind); | |
| 4726 if (!hrc->continuesHumongous()) break; | |
| 4727 // Otherwise, does continue the H region. | |
| 4728 assert(hrc->humongous_start_region() == hr, "Huh?"); | |
| 4729 hrc->hr_clear(par, true /*clear_space*/); | |
| 4730 cleared_h_regions++; | |
| 4731 freed_regions++; | |
| 4732 list->insert_before_head(hrc); | |
| 4733 ind++; | |
| 4734 } | |
| 4735 } else { | |
| 4736 hr->hr_clear(par, true /*clear_space*/); | |
| 4737 list->insert_before_head(hr); | |
| 4738 freed_regions++; | |
| 4739 // If we're using clear2, this should not be enabled. | |
| 4740 // assert(!hr->in_cohort(), "Can't be both free and in a cohort."); | |
| 4741 } | |
| 4742 } | |
| 4743 | |
| 4744 void G1CollectedHeap::finish_free_region_work(size_t pre_used, | |
| 4745 size_t cleared_h_regions, | |
| 4746 size_t freed_regions, | |
| 4747 UncleanRegionList* list) { | |
| 4748 if (list != NULL && list->sz() > 0) { | |
| 4749 prepend_region_list_on_unclean_list(list); | |
| 4750 } | |
| 4751 // Acquire a lock, if we're parallel, to update possibly-shared | |
| 4752 // variables. | |
| 4753 Mutex* lock = (n_par_threads() > 0) ? ParGCRareEvent_lock : NULL; | |
| 4754 { | |
| 4755 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); | |
| 4756 _summary_bytes_used -= pre_used; | |
| 4757 _num_humongous_regions -= (int) cleared_h_regions; | |
| 4758 _free_regions += freed_regions; | |
| 4759 } | |
| 4760 } | |
| 4761 | |
| 4762 | |
| 4763 void G1CollectedHeap::dirtyCardsForYoungRegions(CardTableModRefBS* ct_bs, HeapRegion* list) { | |
| 4764 while (list != NULL) { | |
| 4765 guarantee( list->is_young(), "invariant" ); | |
| 4766 | |
| 4767 HeapWord* bottom = list->bottom(); | |
| 4768 HeapWord* end = list->end(); | |
| 4769 MemRegion mr(bottom, end); | |
| 4770 ct_bs->dirty(mr); | |
| 4771 | |
| 4772 list = list->get_next_young_region(); | |
| 4773 } | |
| 4774 } | |
| 4775 | |
| 4776 void G1CollectedHeap::cleanUpCardTable() { | |
| 4777 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
| 4778 double start = os::elapsedTime(); | |
| 4779 | |
| 4780 ct_bs->clear(_g1_committed); | |
| 4781 | |
| 4782 // now, redirty the cards of the scan-only and survivor regions | |
| 4783 // (it seemed faster to do it this way, instead of iterating over | |
| 4784 // all regions and then clearing / dirtying as approprite) | |
| 4785 dirtyCardsForYoungRegions(ct_bs, _young_list->first_scan_only_region()); | |
| 4786 dirtyCardsForYoungRegions(ct_bs, _young_list->first_survivor_region()); | |
| 4787 | |
| 4788 double elapsed = os::elapsedTime() - start; | |
| 4789 g1_policy()->record_clear_ct_time( elapsed * 1000.0); | |
| 4790 } | |
| 4791 | |
| 4792 | |
| 4793 void G1CollectedHeap::do_collection_pause_if_appropriate(size_t word_size) { | |
| 4794 // First do any popular regions. | |
| 4795 HeapRegion* hr; | |
| 4796 while ((hr = popular_region_to_evac()) != NULL) { | |
| 4797 evac_popular_region(hr); | |
| 4798 } | |
| 4799 // Now do heuristic pauses. | |
| 4800 if (g1_policy()->should_do_collection_pause(word_size)) { | |
| 4801 do_collection_pause(); | |
| 4802 } | |
| 4803 } | |
| 4804 | |
| 4805 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
| 4806 double young_time_ms = 0.0; | |
| 4807 double non_young_time_ms = 0.0; | |
| 4808 | |
| 4809 G1CollectorPolicy* policy = g1_policy(); | |
| 4810 | |
| 4811 double start_sec = os::elapsedTime(); | |
| 4812 bool non_young = true; | |
| 4813 | |
| 4814 HeapRegion* cur = cs_head; | |
| 4815 int age_bound = -1; | |
| 4816 size_t rs_lengths = 0; | |
| 4817 | |
| 4818 while (cur != NULL) { | |
| 4819 if (non_young) { | |
| 4820 if (cur->is_young()) { | |
| 4821 double end_sec = os::elapsedTime(); | |
| 4822 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 4823 non_young_time_ms += elapsed_ms; | |
| 4824 | |
| 4825 start_sec = os::elapsedTime(); | |
| 4826 non_young = false; | |
| 4827 } | |
| 4828 } else { | |
| 4829 if (!cur->is_on_free_list()) { | |
| 4830 double end_sec = os::elapsedTime(); | |
| 4831 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 4832 young_time_ms += elapsed_ms; | |
| 4833 | |
| 4834 start_sec = os::elapsedTime(); | |
| 4835 non_young = true; | |
| 4836 } | |
| 4837 } | |
| 4838 | |
| 4839 rs_lengths += cur->rem_set()->occupied(); | |
| 4840 | |
| 4841 HeapRegion* next = cur->next_in_collection_set(); | |
| 4842 assert(cur->in_collection_set(), "bad CS"); | |
| 4843 cur->set_next_in_collection_set(NULL); | |
| 4844 cur->set_in_collection_set(false); | |
| 4845 | |
| 4846 if (cur->is_young()) { | |
| 4847 int index = cur->young_index_in_cset(); | |
| 4848 guarantee( index != -1, "invariant" ); | |
| 4849 guarantee( (size_t)index < policy->young_cset_length(), "invariant" ); | |
| 4850 size_t words_survived = _surviving_young_words[index]; | |
| 4851 cur->record_surv_words_in_group(words_survived); | |
| 4852 } else { | |
| 4853 int index = cur->young_index_in_cset(); | |
| 4854 guarantee( index == -1, "invariant" ); | |
| 4855 } | |
| 4856 | |
| 4857 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
| 4858 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
| 4859 "invariant" ); | |
| 4860 | |
| 4861 if (!cur->evacuation_failed()) { | |
| 4862 // And the region is empty. | |
| 4863 assert(!cur->is_empty(), | |
| 4864 "Should not have empty regions in a CS."); | |
| 4865 free_region(cur); | |
| 4866 } else { | |
| 4867 guarantee( !cur->is_scan_only(), "should not be scan only" ); | |
| 4868 cur->uninstall_surv_rate_group(); | |
| 4869 if (cur->is_young()) | |
| 4870 cur->set_young_index_in_cset(-1); | |
| 4871 cur->set_not_young(); | |
| 4872 cur->set_evacuation_failed(false); | |
| 4873 } | |
| 4874 cur = next; | |
| 4875 } | |
| 4876 | |
| 4877 policy->record_max_rs_lengths(rs_lengths); | |
| 4878 policy->cset_regions_freed(); | |
| 4879 | |
| 4880 double end_sec = os::elapsedTime(); | |
| 4881 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 4882 if (non_young) | |
| 4883 non_young_time_ms += elapsed_ms; | |
| 4884 else | |
| 4885 young_time_ms += elapsed_ms; | |
| 4886 | |
| 4887 policy->record_young_free_cset_time_ms(young_time_ms); | |
| 4888 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
| 4889 } | |
| 4890 | |
| 4891 HeapRegion* | |
| 4892 G1CollectedHeap::alloc_region_from_unclean_list_locked(bool zero_filled) { | |
| 4893 assert(ZF_mon->owned_by_self(), "Precondition"); | |
| 4894 HeapRegion* res = pop_unclean_region_list_locked(); | |
| 4895 if (res != NULL) { | |
| 4896 assert(!res->continuesHumongous() && | |
| 4897 res->zero_fill_state() != HeapRegion::Allocated, | |
| 4898 "Only free regions on unclean list."); | |
| 4899 if (zero_filled) { | |
| 4900 res->ensure_zero_filled_locked(); | |
| 4901 res->set_zero_fill_allocated(); | |
| 4902 } | |
| 4903 } | |
| 4904 return res; | |
| 4905 } | |
| 4906 | |
| 4907 HeapRegion* G1CollectedHeap::alloc_region_from_unclean_list(bool zero_filled) { | |
| 4908 MutexLockerEx zx(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4909 return alloc_region_from_unclean_list_locked(zero_filled); | |
| 4910 } | |
| 4911 | |
| 4912 void G1CollectedHeap::put_region_on_unclean_list(HeapRegion* r) { | |
| 4913 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4914 put_region_on_unclean_list_locked(r); | |
| 4915 if (should_zf()) ZF_mon->notify_all(); // Wake up ZF thread. | |
| 4916 } | |
| 4917 | |
| 4918 void G1CollectedHeap::set_unclean_regions_coming(bool b) { | |
| 4919 MutexLockerEx x(Cleanup_mon); | |
| 4920 set_unclean_regions_coming_locked(b); | |
| 4921 } | |
| 4922 | |
| 4923 void G1CollectedHeap::set_unclean_regions_coming_locked(bool b) { | |
| 4924 assert(Cleanup_mon->owned_by_self(), "Precondition"); | |
| 4925 _unclean_regions_coming = b; | |
| 4926 // Wake up mutator threads that might be waiting for completeCleanup to | |
| 4927 // finish. | |
| 4928 if (!b) Cleanup_mon->notify_all(); | |
| 4929 } | |
| 4930 | |
| 4931 void G1CollectedHeap::wait_for_cleanup_complete() { | |
| 4932 MutexLockerEx x(Cleanup_mon); | |
| 4933 wait_for_cleanup_complete_locked(); | |
| 4934 } | |
| 4935 | |
| 4936 void G1CollectedHeap::wait_for_cleanup_complete_locked() { | |
| 4937 assert(Cleanup_mon->owned_by_self(), "precondition"); | |
| 4938 while (_unclean_regions_coming) { | |
| 4939 Cleanup_mon->wait(); | |
| 4940 } | |
| 4941 } | |
| 4942 | |
| 4943 void | |
| 4944 G1CollectedHeap::put_region_on_unclean_list_locked(HeapRegion* r) { | |
| 4945 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4946 _unclean_region_list.insert_before_head(r); | |
| 4947 } | |
| 4948 | |
| 4949 void | |
| 4950 G1CollectedHeap::prepend_region_list_on_unclean_list(UncleanRegionList* list) { | |
| 4951 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4952 prepend_region_list_on_unclean_list_locked(list); | |
| 4953 if (should_zf()) ZF_mon->notify_all(); // Wake up ZF thread. | |
| 4954 } | |
| 4955 | |
| 4956 void | |
| 4957 G1CollectedHeap:: | |
| 4958 prepend_region_list_on_unclean_list_locked(UncleanRegionList* list) { | |
| 4959 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4960 _unclean_region_list.prepend_list(list); | |
| 4961 } | |
| 4962 | |
| 4963 HeapRegion* G1CollectedHeap::pop_unclean_region_list_locked() { | |
| 4964 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4965 HeapRegion* res = _unclean_region_list.pop(); | |
| 4966 if (res != NULL) { | |
| 4967 // Inform ZF thread that there's a new unclean head. | |
| 4968 if (_unclean_region_list.hd() != NULL && should_zf()) | |
| 4969 ZF_mon->notify_all(); | |
| 4970 } | |
| 4971 return res; | |
| 4972 } | |
| 4973 | |
| 4974 HeapRegion* G1CollectedHeap::peek_unclean_region_list_locked() { | |
| 4975 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4976 return _unclean_region_list.hd(); | |
| 4977 } | |
| 4978 | |
| 4979 | |
| 4980 bool G1CollectedHeap::move_cleaned_region_to_free_list_locked() { | |
| 4981 assert(ZF_mon->owned_by_self(), "Precondition"); | |
| 4982 HeapRegion* r = peek_unclean_region_list_locked(); | |
| 4983 if (r != NULL && r->zero_fill_state() == HeapRegion::ZeroFilled) { | |
| 4984 // Result of below must be equal to "r", since we hold the lock. | |
| 4985 (void)pop_unclean_region_list_locked(); | |
| 4986 put_free_region_on_list_locked(r); | |
| 4987 return true; | |
| 4988 } else { | |
| 4989 return false; | |
| 4990 } | |
| 4991 } | |
| 4992 | |
| 4993 bool G1CollectedHeap::move_cleaned_region_to_free_list() { | |
| 4994 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4995 return move_cleaned_region_to_free_list_locked(); | |
| 4996 } | |
| 4997 | |
| 4998 | |
| 4999 void G1CollectedHeap::put_free_region_on_list_locked(HeapRegion* r) { | |
| 5000 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 5001 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 5002 assert(r->zero_fill_state() == HeapRegion::ZeroFilled, | |
| 5003 "Regions on free list must be zero filled"); | |
| 5004 assert(!r->isHumongous(), "Must not be humongous."); | |
| 5005 assert(r->is_empty(), "Better be empty"); | |
| 5006 assert(!r->is_on_free_list(), | |
| 5007 "Better not already be on free list"); | |
| 5008 assert(!r->is_on_unclean_list(), | |
| 5009 "Better not already be on unclean list"); | |
| 5010 r->set_on_free_list(true); | |
| 5011 r->set_next_on_free_list(_free_region_list); | |
| 5012 _free_region_list = r; | |
| 5013 _free_region_list_size++; | |
| 5014 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 5015 } | |
| 5016 | |
| 5017 void G1CollectedHeap::put_free_region_on_list(HeapRegion* r) { | |
| 5018 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5019 put_free_region_on_list_locked(r); | |
| 5020 } | |
| 5021 | |
| 5022 HeapRegion* G1CollectedHeap::pop_free_region_list_locked() { | |
| 5023 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 5024 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 5025 HeapRegion* res = _free_region_list; | |
| 5026 if (res != NULL) { | |
| 5027 _free_region_list = res->next_from_free_list(); | |
| 5028 _free_region_list_size--; | |
| 5029 res->set_on_free_list(false); | |
| 5030 res->set_next_on_free_list(NULL); | |
| 5031 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 5032 } | |
| 5033 return res; | |
| 5034 } | |
| 5035 | |
| 5036 | |
| 5037 HeapRegion* G1CollectedHeap::alloc_free_region_from_lists(bool zero_filled) { | |
| 5038 // By self, or on behalf of self. | |
| 5039 assert(Heap_lock->is_locked(), "Precondition"); | |
| 5040 HeapRegion* res = NULL; | |
| 5041 bool first = true; | |
| 5042 while (res == NULL) { | |
| 5043 if (zero_filled || !first) { | |
| 5044 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5045 res = pop_free_region_list_locked(); | |
| 5046 if (res != NULL) { | |
| 5047 assert(!res->zero_fill_is_allocated(), | |
| 5048 "No allocated regions on free list."); | |
| 5049 res->set_zero_fill_allocated(); | |
| 5050 } else if (!first) { | |
| 5051 break; // We tried both, time to return NULL. | |
| 5052 } | |
| 5053 } | |
| 5054 | |
| 5055 if (res == NULL) { | |
| 5056 res = alloc_region_from_unclean_list(zero_filled); | |
| 5057 } | |
| 5058 assert(res == NULL || | |
| 5059 !zero_filled || | |
| 5060 res->zero_fill_is_allocated(), | |
| 5061 "We must have allocated the region we're returning"); | |
| 5062 first = false; | |
| 5063 } | |
| 5064 return res; | |
| 5065 } | |
| 5066 | |
| 5067 void G1CollectedHeap::remove_allocated_regions_from_lists() { | |
| 5068 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5069 { | |
| 5070 HeapRegion* prev = NULL; | |
| 5071 HeapRegion* cur = _unclean_region_list.hd(); | |
| 5072 while (cur != NULL) { | |
| 5073 HeapRegion* next = cur->next_from_unclean_list(); | |
| 5074 if (cur->zero_fill_is_allocated()) { | |
| 5075 // Remove from the list. | |
| 5076 if (prev == NULL) { | |
| 5077 (void)_unclean_region_list.pop(); | |
| 5078 } else { | |
| 5079 _unclean_region_list.delete_after(prev); | |
| 5080 } | |
| 5081 cur->set_on_unclean_list(false); | |
| 5082 cur->set_next_on_unclean_list(NULL); | |
| 5083 } else { | |
| 5084 prev = cur; | |
| 5085 } | |
| 5086 cur = next; | |
| 5087 } | |
| 5088 assert(_unclean_region_list.sz() == unclean_region_list_length(), | |
| 5089 "Inv"); | |
| 5090 } | |
| 5091 | |
| 5092 { | |
| 5093 HeapRegion* prev = NULL; | |
| 5094 HeapRegion* cur = _free_region_list; | |
| 5095 while (cur != NULL) { | |
| 5096 HeapRegion* next = cur->next_from_free_list(); | |
| 5097 if (cur->zero_fill_is_allocated()) { | |
| 5098 // Remove from the list. | |
| 5099 if (prev == NULL) { | |
| 5100 _free_region_list = cur->next_from_free_list(); | |
| 5101 } else { | |
| 5102 prev->set_next_on_free_list(cur->next_from_free_list()); | |
| 5103 } | |
| 5104 cur->set_on_free_list(false); | |
| 5105 cur->set_next_on_free_list(NULL); | |
| 5106 _free_region_list_size--; | |
| 5107 } else { | |
| 5108 prev = cur; | |
| 5109 } | |
| 5110 cur = next; | |
| 5111 } | |
| 5112 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 5113 } | |
| 5114 } | |
| 5115 | |
| 5116 bool G1CollectedHeap::verify_region_lists() { | |
| 5117 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5118 return verify_region_lists_locked(); | |
| 5119 } | |
| 5120 | |
| 5121 bool G1CollectedHeap::verify_region_lists_locked() { | |
| 5122 HeapRegion* unclean = _unclean_region_list.hd(); | |
| 5123 while (unclean != NULL) { | |
| 5124 guarantee(unclean->is_on_unclean_list(), "Well, it is!"); | |
| 5125 guarantee(!unclean->is_on_free_list(), "Well, it shouldn't be!"); | |
| 5126 guarantee(unclean->zero_fill_state() != HeapRegion::Allocated, | |
| 5127 "Everything else is possible."); | |
| 5128 unclean = unclean->next_from_unclean_list(); | |
| 5129 } | |
| 5130 guarantee(_unclean_region_list.sz() == unclean_region_list_length(), "Inv"); | |
| 5131 | |
| 5132 HeapRegion* free_r = _free_region_list; | |
| 5133 while (free_r != NULL) { | |
| 5134 assert(free_r->is_on_free_list(), "Well, it is!"); | |
| 5135 assert(!free_r->is_on_unclean_list(), "Well, it shouldn't be!"); | |
| 5136 switch (free_r->zero_fill_state()) { | |
| 5137 case HeapRegion::NotZeroFilled: | |
| 5138 case HeapRegion::ZeroFilling: | |
| 5139 guarantee(false, "Should not be on free list."); | |
| 5140 break; | |
| 5141 default: | |
| 5142 // Everything else is possible. | |
| 5143 break; | |
| 5144 } | |
| 5145 free_r = free_r->next_from_free_list(); | |
| 5146 } | |
| 5147 guarantee(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 5148 // If we didn't do an assertion... | |
| 5149 return true; | |
| 5150 } | |
| 5151 | |
| 5152 size_t G1CollectedHeap::free_region_list_length() { | |
| 5153 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 5154 size_t len = 0; | |
| 5155 HeapRegion* cur = _free_region_list; | |
| 5156 while (cur != NULL) { | |
| 5157 len++; | |
| 5158 cur = cur->next_from_free_list(); | |
| 5159 } | |
| 5160 return len; | |
| 5161 } | |
| 5162 | |
| 5163 size_t G1CollectedHeap::unclean_region_list_length() { | |
| 5164 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 5165 return _unclean_region_list.length(); | |
| 5166 } | |
| 5167 | |
| 5168 size_t G1CollectedHeap::n_regions() { | |
| 5169 return _hrs->length(); | |
| 5170 } | |
| 5171 | |
| 5172 size_t G1CollectedHeap::max_regions() { | |
| 5173 return | |
| 5174 (size_t)align_size_up(g1_reserved_obj_bytes(), HeapRegion::GrainBytes) / | |
| 5175 HeapRegion::GrainBytes; | |
| 5176 } | |
| 5177 | |
| 5178 size_t G1CollectedHeap::free_regions() { | |
| 5179 /* Possibly-expensive assert. | |
| 5180 assert(_free_regions == count_free_regions(), | |
| 5181 "_free_regions is off."); | |
| 5182 */ | |
| 5183 return _free_regions; | |
| 5184 } | |
| 5185 | |
| 5186 bool G1CollectedHeap::should_zf() { | |
| 5187 return _free_region_list_size < (size_t) G1ConcZFMaxRegions; | |
| 5188 } | |
| 5189 | |
| 5190 class RegionCounter: public HeapRegionClosure { | |
| 5191 size_t _n; | |
| 5192 public: | |
| 5193 RegionCounter() : _n(0) {} | |
| 5194 bool doHeapRegion(HeapRegion* r) { | |
| 5195 if (r->is_empty() && !r->popular()) { | |
| 5196 assert(!r->isHumongous(), "H regions should not be empty."); | |
| 5197 _n++; | |
| 5198 } | |
| 5199 return false; | |
| 5200 } | |
| 5201 int res() { return (int) _n; } | |
| 5202 }; | |
| 5203 | |
| 5204 size_t G1CollectedHeap::count_free_regions() { | |
| 5205 RegionCounter rc; | |
| 5206 heap_region_iterate(&rc); | |
| 5207 size_t n = rc.res(); | |
| 5208 if (_cur_alloc_region != NULL && _cur_alloc_region->is_empty()) | |
| 5209 n--; | |
| 5210 return n; | |
| 5211 } | |
| 5212 | |
| 5213 size_t G1CollectedHeap::count_free_regions_list() { | |
| 5214 size_t n = 0; | |
| 5215 size_t o = 0; | |
| 5216 ZF_mon->lock_without_safepoint_check(); | |
| 5217 HeapRegion* cur = _free_region_list; | |
| 5218 while (cur != NULL) { | |
| 5219 cur = cur->next_from_free_list(); | |
| 5220 n++; | |
| 5221 } | |
| 5222 size_t m = unclean_region_list_length(); | |
| 5223 ZF_mon->unlock(); | |
| 5224 return n + m; | |
| 5225 } | |
| 5226 | |
| 5227 bool G1CollectedHeap::should_set_young_locked() { | |
| 5228 assert(heap_lock_held_for_gc(), | |
| 5229 "the heap lock should already be held by or for this thread"); | |
| 5230 return (g1_policy()->in_young_gc_mode() && | |
| 5231 g1_policy()->should_add_next_region_to_young_list()); | |
| 5232 } | |
| 5233 | |
| 5234 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
| 5235 assert(heap_lock_held_for_gc(), | |
| 5236 "the heap lock should already be held by or for this thread"); | |
| 5237 _young_list->push_region(hr); | |
| 5238 g1_policy()->set_region_short_lived(hr); | |
| 5239 } | |
| 5240 | |
| 5241 class NoYoungRegionsClosure: public HeapRegionClosure { | |
| 5242 private: | |
| 5243 bool _success; | |
| 5244 public: | |
| 5245 NoYoungRegionsClosure() : _success(true) { } | |
| 5246 bool doHeapRegion(HeapRegion* r) { | |
| 5247 if (r->is_young()) { | |
| 5248 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
| 5249 r->bottom(), r->end()); | |
| 5250 _success = false; | |
| 5251 } | |
| 5252 return false; | |
| 5253 } | |
| 5254 bool success() { return _success; } | |
| 5255 }; | |
| 5256 | |
| 5257 bool G1CollectedHeap::check_young_list_empty(bool ignore_scan_only_list, | |
| 5258 bool check_sample) { | |
| 5259 bool ret = true; | |
| 5260 | |
| 5261 ret = _young_list->check_list_empty(ignore_scan_only_list, check_sample); | |
| 5262 if (!ignore_scan_only_list) { | |
| 5263 NoYoungRegionsClosure closure; | |
| 5264 heap_region_iterate(&closure); | |
| 5265 ret = ret && closure.success(); | |
| 5266 } | |
| 5267 | |
| 5268 return ret; | |
| 5269 } | |
| 5270 | |
| 5271 void G1CollectedHeap::empty_young_list() { | |
| 5272 assert(heap_lock_held_for_gc(), | |
| 5273 "the heap lock should already be held by or for this thread"); | |
| 5274 assert(g1_policy()->in_young_gc_mode(), "should be in young GC mode"); | |
| 5275 | |
| 5276 _young_list->empty_list(); | |
| 5277 } | |
| 5278 | |
| 5279 bool G1CollectedHeap::all_alloc_regions_no_allocs_since_save_marks() { | |
| 5280 bool no_allocs = true; | |
| 5281 for (int ap = 0; ap < GCAllocPurposeCount && no_allocs; ++ap) { | |
| 5282 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 5283 no_allocs = r == NULL || r->saved_mark_at_top(); | |
| 5284 } | |
| 5285 return no_allocs; | |
| 5286 } | |
| 5287 | |
| 545 | 5288 void G1CollectedHeap::retire_all_alloc_regions() { |
| 342 | 5289 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
| 5290 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 5291 if (r != NULL) { | |
| 5292 // Check for aliases. | |
| 5293 bool has_processed_alias = false; | |
| 5294 for (int i = 0; i < ap; ++i) { | |
| 5295 if (_gc_alloc_regions[i] == r) { | |
| 5296 has_processed_alias = true; | |
| 5297 break; | |
| 5298 } | |
| 5299 } | |
| 5300 if (!has_processed_alias) { | |
| 545 | 5301 retire_alloc_region(r, false /* par */); |
| 342 | 5302 } |
| 5303 } | |
| 5304 } | |
| 5305 } | |
| 5306 | |
| 5307 | |
| 5308 // Done at the start of full GC. | |
| 5309 void G1CollectedHeap::tear_down_region_lists() { | |
| 5310 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5311 while (pop_unclean_region_list_locked() != NULL) ; | |
| 5312 assert(_unclean_region_list.hd() == NULL && _unclean_region_list.sz() == 0, | |
| 5313 "Postconditions of loop.") | |
| 5314 while (pop_free_region_list_locked() != NULL) ; | |
| 5315 assert(_free_region_list == NULL, "Postcondition of loop."); | |
| 5316 if (_free_region_list_size != 0) { | |
| 5317 gclog_or_tty->print_cr("Size is %d.", _free_region_list_size); | |
| 5318 print(); | |
| 5319 } | |
| 5320 assert(_free_region_list_size == 0, "Postconditions of loop."); | |
| 5321 } | |
| 5322 | |
| 5323 | |
| 5324 class RegionResetter: public HeapRegionClosure { | |
| 5325 G1CollectedHeap* _g1; | |
| 5326 int _n; | |
| 5327 public: | |
| 5328 RegionResetter() : _g1(G1CollectedHeap::heap()), _n(0) {} | |
| 5329 bool doHeapRegion(HeapRegion* r) { | |
| 5330 if (r->continuesHumongous()) return false; | |
| 5331 if (r->top() > r->bottom()) { | |
| 5332 if (r->top() < r->end()) { | |
| 5333 Copy::fill_to_words(r->top(), | |
| 5334 pointer_delta(r->end(), r->top())); | |
| 5335 } | |
| 5336 r->set_zero_fill_allocated(); | |
| 5337 } else { | |
| 5338 assert(r->is_empty(), "tautology"); | |
| 5339 if (r->popular()) { | |
| 5340 if (r->zero_fill_state() != HeapRegion::Allocated) { | |
| 5341 r->ensure_zero_filled_locked(); | |
| 5342 r->set_zero_fill_allocated(); | |
| 5343 } | |
| 5344 } else { | |
| 5345 _n++; | |
| 5346 switch (r->zero_fill_state()) { | |
| 5347 case HeapRegion::NotZeroFilled: | |
| 5348 case HeapRegion::ZeroFilling: | |
| 5349 _g1->put_region_on_unclean_list_locked(r); | |
| 5350 break; | |
| 5351 case HeapRegion::Allocated: | |
| 5352 r->set_zero_fill_complete(); | |
| 5353 // no break; go on to put on free list. | |
| 5354 case HeapRegion::ZeroFilled: | |
| 5355 _g1->put_free_region_on_list_locked(r); | |
| 5356 break; | |
| 5357 } | |
| 5358 } | |
| 5359 } | |
| 5360 return false; | |
| 5361 } | |
| 5362 | |
| 5363 int getFreeRegionCount() {return _n;} | |
| 5364 }; | |
| 5365 | |
| 5366 // Done at the end of full GC. | |
| 5367 void G1CollectedHeap::rebuild_region_lists() { | |
| 5368 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5369 // This needs to go at the end of the full GC. | |
| 5370 RegionResetter rs; | |
| 5371 heap_region_iterate(&rs); | |
| 5372 _free_regions = rs.getFreeRegionCount(); | |
| 5373 // Tell the ZF thread it may have work to do. | |
| 5374 if (should_zf()) ZF_mon->notify_all(); | |
| 5375 } | |
| 5376 | |
| 5377 class UsedRegionsNeedZeroFillSetter: public HeapRegionClosure { | |
| 5378 G1CollectedHeap* _g1; | |
| 5379 int _n; | |
| 5380 public: | |
| 5381 UsedRegionsNeedZeroFillSetter() : _g1(G1CollectedHeap::heap()), _n(0) {} | |
| 5382 bool doHeapRegion(HeapRegion* r) { | |
| 5383 if (r->continuesHumongous()) return false; | |
| 5384 if (r->top() > r->bottom()) { | |
| 5385 // There are assertions in "set_zero_fill_needed()" below that | |
| 5386 // require top() == bottom(), so this is technically illegal. | |
| 5387 // We'll skirt the law here, by making that true temporarily. | |
| 5388 DEBUG_ONLY(HeapWord* save_top = r->top(); | |
| 5389 r->set_top(r->bottom())); | |
| 5390 r->set_zero_fill_needed(); | |
| 5391 DEBUG_ONLY(r->set_top(save_top)); | |
| 5392 } | |
| 5393 return false; | |
| 5394 } | |
| 5395 }; | |
| 5396 | |
| 5397 // Done at the start of full GC. | |
| 5398 void G1CollectedHeap::set_used_regions_to_need_zero_fill() { | |
| 5399 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5400 // This needs to go at the end of the full GC. | |
| 5401 UsedRegionsNeedZeroFillSetter rs; | |
| 5402 heap_region_iterate(&rs); | |
| 5403 } | |
| 5404 | |
| 5405 class CountObjClosure: public ObjectClosure { | |
| 5406 size_t _n; | |
| 5407 public: | |
| 5408 CountObjClosure() : _n(0) {} | |
| 5409 void do_object(oop obj) { _n++; } | |
| 5410 size_t n() { return _n; } | |
| 5411 }; | |
| 5412 | |
| 5413 size_t G1CollectedHeap::pop_object_used_objs() { | |
| 5414 size_t sum_objs = 0; | |
| 5415 for (int i = 0; i < G1NumPopularRegions; i++) { | |
| 5416 CountObjClosure cl; | |
| 5417 _hrs->at(i)->object_iterate(&cl); | |
| 5418 sum_objs += cl.n(); | |
| 5419 } | |
| 5420 return sum_objs; | |
| 5421 } | |
| 5422 | |
| 5423 size_t G1CollectedHeap::pop_object_used_bytes() { | |
| 5424 size_t sum_bytes = 0; | |
| 5425 for (int i = 0; i < G1NumPopularRegions; i++) { | |
| 5426 sum_bytes += _hrs->at(i)->used(); | |
| 5427 } | |
| 5428 return sum_bytes; | |
| 5429 } | |
| 5430 | |
| 5431 | |
| 5432 static int nq = 0; | |
| 5433 | |
| 5434 HeapWord* G1CollectedHeap::allocate_popular_object(size_t word_size) { | |
| 5435 while (_cur_pop_hr_index < G1NumPopularRegions) { | |
| 5436 HeapRegion* cur_pop_region = _hrs->at(_cur_pop_hr_index); | |
| 5437 HeapWord* res = cur_pop_region->allocate(word_size); | |
| 5438 if (res != NULL) { | |
| 5439 // We account for popular objs directly in the used summary: | |
| 5440 _summary_bytes_used += (word_size * HeapWordSize); | |
| 5441 return res; | |
| 5442 } | |
| 5443 // Otherwise, try the next region (first making sure that we remember | |
| 5444 // the last "top" value as the "next_top_at_mark_start", so that | |
| 5445 // objects made popular during markings aren't automatically considered | |
| 5446 // live). | |
| 5447 cur_pop_region->note_end_of_copying(); | |
| 5448 // Otherwise, try the next region. | |
| 5449 _cur_pop_hr_index++; | |
| 5450 } | |
| 5451 // XXX: For now !!! | |
| 5452 vm_exit_out_of_memory(word_size, | |
| 5453 "Not enough pop obj space (To Be Fixed)"); | |
| 5454 return NULL; | |
| 5455 } | |
| 5456 | |
| 5457 class HeapRegionList: public CHeapObj { | |
| 5458 public: | |
| 5459 HeapRegion* hr; | |
| 5460 HeapRegionList* next; | |
| 5461 }; | |
| 5462 | |
| 5463 void G1CollectedHeap::schedule_popular_region_evac(HeapRegion* r) { | |
| 5464 // This might happen during parallel GC, so protect by this lock. | |
| 5465 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 5466 // We don't schedule regions whose evacuations are already pending, or | |
| 5467 // are already being evacuated. | |
| 5468 if (!r->popular_pending() && !r->in_collection_set()) { | |
| 5469 r->set_popular_pending(true); | |
| 5470 if (G1TracePopularity) { | |
| 5471 gclog_or_tty->print_cr("Scheduling region "PTR_FORMAT" " | |
| 5472 "["PTR_FORMAT", "PTR_FORMAT") for pop-object evacuation.", | |
| 5473 r, r->bottom(), r->end()); | |
| 5474 } | |
| 5475 HeapRegionList* hrl = new HeapRegionList; | |
| 5476 hrl->hr = r; | |
| 5477 hrl->next = _popular_regions_to_be_evacuated; | |
| 5478 _popular_regions_to_be_evacuated = hrl; | |
| 5479 } | |
| 5480 } | |
| 5481 | |
| 5482 HeapRegion* G1CollectedHeap::popular_region_to_evac() { | |
| 5483 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 5484 HeapRegion* res = NULL; | |
| 5485 while (_popular_regions_to_be_evacuated != NULL && res == NULL) { | |
| 5486 HeapRegionList* hrl = _popular_regions_to_be_evacuated; | |
| 5487 _popular_regions_to_be_evacuated = hrl->next; | |
| 5488 res = hrl->hr; | |
| 5489 // The G1RSPopLimit may have increased, so recheck here... | |
| 5490 if (res->rem_set()->occupied() < (size_t) G1RSPopLimit) { | |
| 5491 // Hah: don't need to schedule. | |
| 5492 if (G1TracePopularity) { | |
| 5493 gclog_or_tty->print_cr("Unscheduling region "PTR_FORMAT" " | |
| 5494 "["PTR_FORMAT", "PTR_FORMAT") " | |
| 5495 "for pop-object evacuation (size %d < limit %d)", | |
| 5496 res, res->bottom(), res->end(), | |
| 5497 res->rem_set()->occupied(), G1RSPopLimit); | |
| 5498 } | |
| 5499 res->set_popular_pending(false); | |
| 5500 res = NULL; | |
| 5501 } | |
| 5502 // We do not reset res->popular() here; if we did so, it would allow | |
| 5503 // the region to be "rescheduled" for popularity evacuation. Instead, | |
| 5504 // this is done in the collection pause, with the world stopped. | |
| 5505 // So the invariant is that the regions in the list have the popularity | |
| 5506 // boolean set, but having the boolean set does not imply membership | |
| 5507 // on the list (though there can at most one such pop-pending region | |
| 5508 // not on the list at any time). | |
| 5509 delete hrl; | |
| 5510 } | |
| 5511 return res; | |
| 5512 } | |
| 5513 | |
| 5514 void G1CollectedHeap::evac_popular_region(HeapRegion* hr) { | |
| 5515 while (true) { | |
| 5516 // Don't want to do a GC pause while cleanup is being completed! | |
| 5517 wait_for_cleanup_complete(); | |
| 5518 | |
| 5519 // Read the GC count while holding the Heap_lock | |
| 5520 int gc_count_before = SharedHeap::heap()->total_collections(); | |
| 5521 g1_policy()->record_stop_world_start(); | |
| 5522 | |
| 5523 { | |
| 5524 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
| 5525 VM_G1PopRegionCollectionPause op(gc_count_before, hr); | |
| 5526 VMThread::execute(&op); | |
| 5527 | |
| 5528 // If the prolog succeeded, we didn't do a GC for this. | |
| 5529 if (op.prologue_succeeded()) break; | |
| 5530 } | |
| 5531 // Otherwise we didn't. We should recheck the size, though, since | |
| 5532 // the limit may have increased... | |
| 5533 if (hr->rem_set()->occupied() < (size_t) G1RSPopLimit) { | |
| 5534 hr->set_popular_pending(false); | |
| 5535 break; | |
| 5536 } | |
| 5537 } | |
| 5538 } | |
| 5539 | |
| 5540 void G1CollectedHeap::atomic_inc_obj_rc(oop obj) { | |
| 5541 Atomic::inc(obj_rc_addr(obj)); | |
| 5542 } | |
| 5543 | |
| 5544 class CountRCClosure: public OopsInHeapRegionClosure { | |
| 5545 G1CollectedHeap* _g1h; | |
| 5546 bool _parallel; | |
| 5547 public: | |
| 5548 CountRCClosure(G1CollectedHeap* g1h) : | |
| 5549 _g1h(g1h), _parallel(ParallelGCThreads > 0) | |
| 5550 {} | |
| 5551 void do_oop(narrowOop* p) { | |
| 5552 guarantee(false, "NYI"); | |
| 5553 } | |
| 5554 void do_oop(oop* p) { | |
| 5555 oop obj = *p; | |
| 5556 assert(obj != NULL, "Precondition."); | |
| 5557 if (_parallel) { | |
| 5558 // We go sticky at the limit to avoid excess contention. | |
| 5559 // If we want to track the actual RC's further, we'll need to keep a | |
| 5560 // per-thread hash table or something for the popular objects. | |
| 5561 if (_g1h->obj_rc(obj) < G1ObjPopLimit) { | |
| 5562 _g1h->atomic_inc_obj_rc(obj); | |
| 5563 } | |
| 5564 } else { | |
| 5565 _g1h->inc_obj_rc(obj); | |
| 5566 } | |
| 5567 } | |
| 5568 }; | |
| 5569 | |
| 5570 class EvacPopObjClosure: public ObjectClosure { | |
| 5571 G1CollectedHeap* _g1h; | |
| 5572 size_t _pop_objs; | |
| 5573 size_t _max_rc; | |
| 5574 public: | |
| 5575 EvacPopObjClosure(G1CollectedHeap* g1h) : | |
| 5576 _g1h(g1h), _pop_objs(0), _max_rc(0) {} | |
| 5577 | |
| 5578 void do_object(oop obj) { | |
| 5579 size_t rc = _g1h->obj_rc(obj); | |
| 5580 _max_rc = MAX2(rc, _max_rc); | |
| 5581 if (rc >= (size_t) G1ObjPopLimit) { | |
| 5582 _g1h->_pop_obj_rc_at_copy.add((double)rc); | |
| 5583 size_t word_sz = obj->size(); | |
| 5584 HeapWord* new_pop_loc = _g1h->allocate_popular_object(word_sz); | |
| 5585 oop new_pop_obj = (oop)new_pop_loc; | |
| 5586 Copy::aligned_disjoint_words((HeapWord*)obj, new_pop_loc, word_sz); | |
| 5587 obj->forward_to(new_pop_obj); | |
| 5588 G1ScanAndBalanceClosure scan_and_balance(_g1h); | |
| 5589 new_pop_obj->oop_iterate_backwards(&scan_and_balance); | |
| 5590 // preserve "next" mark bit if marking is in progress. | |
| 5591 if (_g1h->mark_in_progress() && !_g1h->is_obj_ill(obj)) { | |
| 5592 _g1h->concurrent_mark()->markAndGrayObjectIfNecessary(new_pop_obj); | |
| 5593 } | |
| 5594 | |
| 5595 if (G1TracePopularity) { | |
| 5596 gclog_or_tty->print_cr("Found obj " PTR_FORMAT " of word size " SIZE_FORMAT | |
| 5597 " pop (%d), move to " PTR_FORMAT, | |
| 5598 (void*) obj, word_sz, | |
| 5599 _g1h->obj_rc(obj), (void*) new_pop_obj); | |
| 5600 } | |
| 5601 _pop_objs++; | |
| 5602 } | |
| 5603 } | |
| 5604 size_t pop_objs() { return _pop_objs; } | |
| 5605 size_t max_rc() { return _max_rc; } | |
| 5606 }; | |
| 5607 | |
| 5608 class G1ParCountRCTask : public AbstractGangTask { | |
| 5609 G1CollectedHeap* _g1h; | |
| 5610 BitMap _bm; | |
| 5611 | |
| 5612 size_t getNCards() { | |
| 5613 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
| 5614 / G1BlockOffsetSharedArray::N_bytes; | |
| 5615 } | |
| 5616 CountRCClosure _count_rc_closure; | |
| 5617 public: | |
| 5618 G1ParCountRCTask(G1CollectedHeap* g1h) : | |
| 5619 AbstractGangTask("G1 Par RC Count task"), | |
| 5620 _g1h(g1h), _bm(getNCards()), _count_rc_closure(g1h) | |
| 5621 {} | |
| 5622 | |
| 5623 void work(int i) { | |
| 5624 ResourceMark rm; | |
| 5625 HandleMark hm; | |
| 5626 _g1h->g1_rem_set()->oops_into_collection_set_do(&_count_rc_closure, i); | |
| 5627 } | |
| 5628 }; | |
| 5629 | |
| 5630 void G1CollectedHeap::popularity_pause_preamble(HeapRegion* popular_region) { | |
| 5631 // We're evacuating a single region (for popularity). | |
| 5632 if (G1TracePopularity) { | |
| 5633 gclog_or_tty->print_cr("Doing pop region pause for ["PTR_FORMAT", "PTR_FORMAT")", | |
| 5634 popular_region->bottom(), popular_region->end()); | |
| 5635 } | |
| 5636 g1_policy()->set_single_region_collection_set(popular_region); | |
| 5637 size_t max_rc; | |
| 5638 if (!compute_reference_counts_and_evac_popular(popular_region, | |
| 5639 &max_rc)) { | |
| 5640 // We didn't evacuate any popular objects. | |
| 5641 // We increase the RS popularity limit, to prevent this from | |
| 5642 // happening in the future. | |
| 5643 if (G1RSPopLimit < (1 << 30)) { | |
| 5644 G1RSPopLimit *= 2; | |
| 5645 } | |
| 5646 // For now, interesting enough for a message: | |
| 5647 #if 1 | |
| 5648 gclog_or_tty->print_cr("In pop region pause for ["PTR_FORMAT", "PTR_FORMAT"), " | |
| 5649 "failed to find a pop object (max = %d).", | |
| 5650 popular_region->bottom(), popular_region->end(), | |
| 5651 max_rc); | |
| 5652 gclog_or_tty->print_cr("Increased G1RSPopLimit to %d.", G1RSPopLimit); | |
| 5653 #endif // 0 | |
| 5654 // Also, we reset the collection set to NULL, to make the rest of | |
| 5655 // the collection do nothing. | |
| 5656 assert(popular_region->next_in_collection_set() == NULL, | |
| 5657 "should be single-region."); | |
| 5658 popular_region->set_in_collection_set(false); | |
| 5659 popular_region->set_popular_pending(false); | |
| 5660 g1_policy()->clear_collection_set(); | |
| 5661 } | |
| 5662 } | |
| 5663 | |
| 5664 bool G1CollectedHeap:: | |
| 5665 compute_reference_counts_and_evac_popular(HeapRegion* popular_region, | |
| 5666 size_t* max_rc) { | |
| 5667 HeapWord* rc_region_bot; | |
| 5668 HeapWord* rc_region_end; | |
| 5669 | |
| 5670 // Set up the reference count region. | |
| 5671 HeapRegion* rc_region = newAllocRegion(HeapRegion::GrainWords); | |
| 5672 if (rc_region != NULL) { | |
| 5673 rc_region_bot = rc_region->bottom(); | |
| 5674 rc_region_end = rc_region->end(); | |
| 5675 } else { | |
| 5676 rc_region_bot = NEW_C_HEAP_ARRAY(HeapWord, HeapRegion::GrainWords); | |
| 5677 if (rc_region_bot == NULL) { | |
| 5678 vm_exit_out_of_memory(HeapRegion::GrainWords, | |
| 5679 "No space for RC region."); | |
| 5680 } | |
| 5681 rc_region_end = rc_region_bot + HeapRegion::GrainWords; | |
| 5682 } | |
| 5683 | |
| 5684 if (G1TracePopularity) | |
| 5685 gclog_or_tty->print_cr("RC region is ["PTR_FORMAT", "PTR_FORMAT")", | |
| 5686 rc_region_bot, rc_region_end); | |
| 5687 if (rc_region_bot > popular_region->bottom()) { | |
| 5688 _rc_region_above = true; | |
| 5689 _rc_region_diff = | |
| 5690 pointer_delta(rc_region_bot, popular_region->bottom(), 1); | |
| 5691 } else { | |
| 5692 assert(rc_region_bot < popular_region->bottom(), "Can't be equal."); | |
| 5693 _rc_region_above = false; | |
| 5694 _rc_region_diff = | |
| 5695 pointer_delta(popular_region->bottom(), rc_region_bot, 1); | |
| 5696 } | |
| 5697 g1_policy()->record_pop_compute_rc_start(); | |
| 5698 // Count external references. | |
| 5699 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
| 5700 if (ParallelGCThreads > 0) { | |
| 5701 | |
| 5702 set_par_threads(workers()->total_workers()); | |
| 5703 G1ParCountRCTask par_count_rc_task(this); | |
| 5704 workers()->run_task(&par_count_rc_task); | |
| 5705 set_par_threads(0); | |
| 5706 | |
| 5707 } else { | |
| 5708 CountRCClosure count_rc_closure(this); | |
| 5709 g1_rem_set()->oops_into_collection_set_do(&count_rc_closure, 0); | |
| 5710 } | |
| 5711 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); | |
| 5712 g1_policy()->record_pop_compute_rc_end(); | |
| 5713 | |
| 5714 // Now evacuate popular objects. | |
| 5715 g1_policy()->record_pop_evac_start(); | |
| 5716 EvacPopObjClosure evac_pop_obj_cl(this); | |
| 5717 popular_region->object_iterate(&evac_pop_obj_cl); | |
| 5718 *max_rc = evac_pop_obj_cl.max_rc(); | |
| 5719 | |
| 5720 // Make sure the last "top" value of the current popular region is copied | |
| 5721 // as the "next_top_at_mark_start", so that objects made popular during | |
| 5722 // markings aren't automatically considered live. | |
| 5723 HeapRegion* cur_pop_region = _hrs->at(_cur_pop_hr_index); | |
| 5724 cur_pop_region->note_end_of_copying(); | |
| 5725 | |
| 5726 if (rc_region != NULL) { | |
| 5727 free_region(rc_region); | |
| 5728 } else { | |
| 5729 FREE_C_HEAP_ARRAY(HeapWord, rc_region_bot); | |
| 5730 } | |
| 5731 g1_policy()->record_pop_evac_end(); | |
| 5732 | |
| 5733 return evac_pop_obj_cl.pop_objs() > 0; | |
| 5734 } | |
| 5735 | |
| 5736 class CountPopObjInfoClosure: public HeapRegionClosure { | |
| 5737 size_t _objs; | |
| 5738 size_t _bytes; | |
| 5739 | |
| 5740 class CountObjClosure: public ObjectClosure { | |
| 5741 int _n; | |
| 5742 public: | |
| 5743 CountObjClosure() : _n(0) {} | |
| 5744 void do_object(oop obj) { _n++; } | |
| 5745 size_t n() { return _n; } | |
| 5746 }; | |
| 5747 | |
| 5748 public: | |
| 5749 CountPopObjInfoClosure() : _objs(0), _bytes(0) {} | |
| 5750 bool doHeapRegion(HeapRegion* r) { | |
| 5751 _bytes += r->used(); | |
| 5752 CountObjClosure blk; | |
| 5753 r->object_iterate(&blk); | |
| 5754 _objs += blk.n(); | |
| 5755 return false; | |
| 5756 } | |
| 5757 size_t objs() { return _objs; } | |
| 5758 size_t bytes() { return _bytes; } | |
| 5759 }; | |
| 5760 | |
| 5761 | |
| 5762 void G1CollectedHeap::print_popularity_summary_info() const { | |
| 5763 CountPopObjInfoClosure blk; | |
| 5764 for (int i = 0; i <= _cur_pop_hr_index; i++) { | |
| 5765 blk.doHeapRegion(_hrs->at(i)); | |
| 5766 } | |
| 5767 gclog_or_tty->print_cr("\nPopular objects: %d objs, %d bytes.", | |
| 5768 blk.objs(), blk.bytes()); | |
| 5769 gclog_or_tty->print_cr(" RC at copy = [avg = %5.2f, max = %5.2f, sd = %5.2f].", | |
| 5770 _pop_obj_rc_at_copy.avg(), | |
| 5771 _pop_obj_rc_at_copy.maximum(), | |
| 5772 _pop_obj_rc_at_copy.sd()); | |
| 5773 } | |
| 5774 | |
| 5775 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
| 5776 _refine_cte_cl->set_concurrent(concurrent); | |
| 5777 } | |
| 5778 | |
| 5779 #ifndef PRODUCT | |
| 5780 | |
| 5781 class PrintHeapRegionClosure: public HeapRegionClosure { | |
| 5782 public: | |
| 5783 bool doHeapRegion(HeapRegion *r) { | |
| 5784 gclog_or_tty->print("Region: "PTR_FORMAT":", r); | |
| 5785 if (r != NULL) { | |
| 5786 if (r->is_on_free_list()) | |
| 5787 gclog_or_tty->print("Free "); | |
| 5788 if (r->is_young()) | |
| 5789 gclog_or_tty->print("Young "); | |
| 5790 if (r->isHumongous()) | |
| 5791 gclog_or_tty->print("Is Humongous "); | |
| 5792 r->print(); | |
| 5793 } | |
| 5794 return false; | |
| 5795 } | |
| 5796 }; | |
| 5797 | |
| 5798 class SortHeapRegionClosure : public HeapRegionClosure { | |
| 5799 size_t young_regions,free_regions, unclean_regions; | |
| 5800 size_t hum_regions, count; | |
| 5801 size_t unaccounted, cur_unclean, cur_alloc; | |
| 5802 size_t total_free; | |
| 5803 HeapRegion* cur; | |
| 5804 public: | |
| 5805 SortHeapRegionClosure(HeapRegion *_cur) : cur(_cur), young_regions(0), | |
| 5806 free_regions(0), unclean_regions(0), | |
| 5807 hum_regions(0), | |
| 5808 count(0), unaccounted(0), | |
| 5809 cur_alloc(0), total_free(0) | |
| 5810 {} | |
| 5811 bool doHeapRegion(HeapRegion *r) { | |
| 5812 count++; | |
| 5813 if (r->is_on_free_list()) free_regions++; | |
| 5814 else if (r->is_on_unclean_list()) unclean_regions++; | |
| 5815 else if (r->isHumongous()) hum_regions++; | |
| 5816 else if (r->is_young()) young_regions++; | |
| 5817 else if (r == cur) cur_alloc++; | |
| 5818 else unaccounted++; | |
| 5819 return false; | |
| 5820 } | |
| 5821 void print() { | |
| 5822 total_free = free_regions + unclean_regions; | |
| 5823 gclog_or_tty->print("%d regions\n", count); | |
| 5824 gclog_or_tty->print("%d free: free_list = %d unclean = %d\n", | |
| 5825 total_free, free_regions, unclean_regions); | |
| 5826 gclog_or_tty->print("%d humongous %d young\n", | |
| 5827 hum_regions, young_regions); | |
| 5828 gclog_or_tty->print("%d cur_alloc\n", cur_alloc); | |
| 5829 gclog_or_tty->print("UHOH unaccounted = %d\n", unaccounted); | |
| 5830 } | |
| 5831 }; | |
| 5832 | |
| 5833 void G1CollectedHeap::print_region_counts() { | |
| 5834 SortHeapRegionClosure sc(_cur_alloc_region); | |
| 5835 PrintHeapRegionClosure cl; | |
| 5836 heap_region_iterate(&cl); | |
| 5837 heap_region_iterate(&sc); | |
| 5838 sc.print(); | |
| 5839 print_region_accounting_info(); | |
| 5840 }; | |
| 5841 | |
| 5842 bool G1CollectedHeap::regions_accounted_for() { | |
| 5843 // TODO: regions accounting for young/survivor/tenured | |
| 5844 return true; | |
| 5845 } | |
| 5846 | |
| 5847 bool G1CollectedHeap::print_region_accounting_info() { | |
| 5848 gclog_or_tty->print_cr("P regions: %d.", G1NumPopularRegions); | |
| 5849 gclog_or_tty->print_cr("Free regions: %d (count: %d count list %d) (clean: %d unclean: %d).", | |
| 5850 free_regions(), | |
| 5851 count_free_regions(), count_free_regions_list(), | |
| 5852 _free_region_list_size, _unclean_region_list.sz()); | |
| 5853 gclog_or_tty->print_cr("cur_alloc: %d.", | |
| 5854 (_cur_alloc_region == NULL ? 0 : 1)); | |
| 5855 gclog_or_tty->print_cr("H regions: %d.", _num_humongous_regions); | |
| 5856 | |
| 5857 // TODO: check regions accounting for young/survivor/tenured | |
| 5858 return true; | |
| 5859 } | |
| 5860 | |
| 5861 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
| 5862 HeapRegion* hr = heap_region_containing(p); | |
| 5863 if (hr == NULL) { | |
| 5864 return is_in_permanent(p); | |
| 5865 } else { | |
| 5866 return hr->is_in(p); | |
| 5867 } | |
| 5868 } | |
| 5869 #endif // PRODUCT | |
| 5870 | |
| 5871 void G1CollectedHeap::g1_unimplemented() { | |
| 5872 // Unimplemented(); | |
| 5873 } | |
| 5874 | |
| 5875 | |
| 5876 // Local Variables: *** | |
| 5877 // c-indentation-style: gnu *** | |
| 5878 // End: *** |