Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 838:0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
Summary: Changing the behavior of -XX:+PrintHeapAtGC for G1 from printing lengthy, per-region information to instead printing a concise summary.
Reviewed-by: ysr, apetrusenko, jcoomes
| author | tonyp |
|---|---|
| date | Tue, 07 Jul 2009 14:23:00 -0400 |
| parents | 830ca2573896 |
| children | df6caf649ff7 |
| 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 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
| 46 SuspendibleThreadSet* _sts; | |
| 47 G1RemSet* _g1rs; | |
| 48 ConcurrentG1Refine* _cg1r; | |
| 49 bool _concurrent; | |
| 50 public: | |
| 51 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
| 52 G1RemSet* g1rs, | |
| 53 ConcurrentG1Refine* cg1r) : | |
| 54 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
| 55 {} | |
| 56 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 57 _g1rs->concurrentRefineOneCard(card_ptr, worker_i); | |
| 58 if (_concurrent && _sts->should_yield()) { | |
| 59 // Caller will actually yield. | |
| 60 return false; | |
| 61 } | |
| 62 // Otherwise, we finished successfully; return true. | |
| 63 return true; | |
| 64 } | |
| 65 void set_concurrent(bool b) { _concurrent = b; } | |
| 66 }; | |
| 67 | |
| 68 | |
| 69 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 70 int _calls; | |
| 71 G1CollectedHeap* _g1h; | |
| 72 CardTableModRefBS* _ctbs; | |
| 73 int _histo[256]; | |
| 74 public: | |
| 75 ClearLoggedCardTableEntryClosure() : | |
| 76 _calls(0) | |
| 77 { | |
| 78 _g1h = G1CollectedHeap::heap(); | |
| 79 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 80 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
| 81 } | |
| 82 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 83 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 84 _calls++; | |
| 85 unsigned char* ujb = (unsigned char*)card_ptr; | |
| 86 int ind = (int)(*ujb); | |
| 87 _histo[ind]++; | |
| 88 *card_ptr = -1; | |
| 89 } | |
| 90 return true; | |
| 91 } | |
| 92 int calls() { return _calls; } | |
| 93 void print_histo() { | |
| 94 gclog_or_tty->print_cr("Card table value histogram:"); | |
| 95 for (int i = 0; i < 256; i++) { | |
| 96 if (_histo[i] != 0) { | |
| 97 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
| 98 } | |
| 99 } | |
| 100 } | |
| 101 }; | |
| 102 | |
| 103 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 104 int _calls; | |
| 105 G1CollectedHeap* _g1h; | |
| 106 CardTableModRefBS* _ctbs; | |
| 107 public: | |
| 108 RedirtyLoggedCardTableEntryClosure() : | |
| 109 _calls(0) | |
| 110 { | |
| 111 _g1h = G1CollectedHeap::heap(); | |
| 112 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 113 } | |
| 114 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 115 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 116 _calls++; | |
| 117 *card_ptr = 0; | |
| 118 } | |
| 119 return true; | |
| 120 } | |
| 121 int calls() { return _calls; } | |
| 122 }; | |
| 123 | |
|
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124 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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125 public: |
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126 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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127 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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128 return true; |
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129 } |
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130 }; |
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131 |
| 342 | 132 YoungList::YoungList(G1CollectedHeap* g1h) |
| 133 : _g1h(g1h), _head(NULL), | |
| 134 _scan_only_head(NULL), _scan_only_tail(NULL), _curr_scan_only(NULL), | |
| 135 _length(0), _scan_only_length(0), | |
| 136 _last_sampled_rs_lengths(0), | |
| 545 | 137 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) |
| 342 | 138 { |
| 139 guarantee( check_list_empty(false), "just making sure..." ); | |
| 140 } | |
| 141 | |
| 142 void YoungList::push_region(HeapRegion *hr) { | |
| 143 assert(!hr->is_young(), "should not already be young"); | |
| 144 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
| 145 | |
| 146 hr->set_next_young_region(_head); | |
| 147 _head = hr; | |
| 148 | |
| 149 hr->set_young(); | |
| 150 double yg_surv_rate = _g1h->g1_policy()->predict_yg_surv_rate((int)_length); | |
| 151 ++_length; | |
| 152 } | |
| 153 | |
| 154 void YoungList::add_survivor_region(HeapRegion* hr) { | |
| 545 | 155 assert(hr->is_survivor(), "should be flagged as survivor region"); |
| 342 | 156 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
| 157 | |
| 158 hr->set_next_young_region(_survivor_head); | |
| 159 if (_survivor_head == NULL) { | |
| 545 | 160 _survivor_tail = hr; |
| 342 | 161 } |
| 162 _survivor_head = hr; | |
| 163 | |
| 164 ++_survivor_length; | |
| 165 } | |
| 166 | |
| 167 HeapRegion* YoungList::pop_region() { | |
| 168 while (_head != NULL) { | |
| 169 assert( length() > 0, "list should not be empty" ); | |
| 170 HeapRegion* ret = _head; | |
| 171 _head = ret->get_next_young_region(); | |
| 172 ret->set_next_young_region(NULL); | |
| 173 --_length; | |
| 174 assert(ret->is_young(), "region should be very young"); | |
| 175 | |
| 176 // Replace 'Survivor' region type with 'Young'. So the region will | |
| 177 // be treated as a young region and will not be 'confused' with | |
| 178 // newly created survivor regions. | |
| 179 if (ret->is_survivor()) { | |
| 180 ret->set_young(); | |
| 181 } | |
| 182 | |
| 183 if (!ret->is_scan_only()) { | |
| 184 return ret; | |
| 185 } | |
| 186 | |
| 187 // scan-only, we'll add it to the scan-only list | |
| 188 if (_scan_only_tail == NULL) { | |
| 189 guarantee( _scan_only_head == NULL, "invariant" ); | |
| 190 | |
| 191 _scan_only_head = ret; | |
| 192 _curr_scan_only = ret; | |
| 193 } else { | |
| 194 guarantee( _scan_only_head != NULL, "invariant" ); | |
| 195 _scan_only_tail->set_next_young_region(ret); | |
| 196 } | |
| 197 guarantee( ret->get_next_young_region() == NULL, "invariant" ); | |
| 198 _scan_only_tail = ret; | |
| 199 | |
| 200 // no need to be tagged as scan-only any more | |
| 201 ret->set_young(); | |
| 202 | |
| 203 ++_scan_only_length; | |
| 204 } | |
| 205 assert( length() == 0, "list should be empty" ); | |
| 206 return NULL; | |
| 207 } | |
| 208 | |
| 209 void YoungList::empty_list(HeapRegion* list) { | |
| 210 while (list != NULL) { | |
| 211 HeapRegion* next = list->get_next_young_region(); | |
| 212 list->set_next_young_region(NULL); | |
| 213 list->uninstall_surv_rate_group(); | |
| 214 list->set_not_young(); | |
| 215 list = next; | |
| 216 } | |
| 217 } | |
| 218 | |
| 219 void YoungList::empty_list() { | |
| 220 assert(check_list_well_formed(), "young list should be well formed"); | |
| 221 | |
| 222 empty_list(_head); | |
| 223 _head = NULL; | |
| 224 _length = 0; | |
| 225 | |
| 226 empty_list(_scan_only_head); | |
| 227 _scan_only_head = NULL; | |
| 228 _scan_only_tail = NULL; | |
| 229 _scan_only_length = 0; | |
| 230 _curr_scan_only = NULL; | |
| 231 | |
| 232 empty_list(_survivor_head); | |
| 233 _survivor_head = NULL; | |
| 545 | 234 _survivor_tail = NULL; |
| 342 | 235 _survivor_length = 0; |
| 236 | |
| 237 _last_sampled_rs_lengths = 0; | |
| 238 | |
| 239 assert(check_list_empty(false), "just making sure..."); | |
| 240 } | |
| 241 | |
| 242 bool YoungList::check_list_well_formed() { | |
| 243 bool ret = true; | |
| 244 | |
| 245 size_t length = 0; | |
| 246 HeapRegion* curr = _head; | |
| 247 HeapRegion* last = NULL; | |
| 248 while (curr != NULL) { | |
| 249 if (!curr->is_young() || curr->is_scan_only()) { | |
| 250 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " | |
| 251 "incorrectly tagged (%d, %d)", | |
| 252 curr->bottom(), curr->end(), | |
| 253 curr->is_young(), curr->is_scan_only()); | |
| 254 ret = false; | |
| 255 } | |
| 256 ++length; | |
| 257 last = curr; | |
| 258 curr = curr->get_next_young_region(); | |
| 259 } | |
| 260 ret = ret && (length == _length); | |
| 261 | |
| 262 if (!ret) { | |
| 263 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
| 264 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
| 265 length, _length); | |
| 266 } | |
| 267 | |
| 268 bool scan_only_ret = true; | |
| 269 length = 0; | |
| 270 curr = _scan_only_head; | |
| 271 last = NULL; | |
| 272 while (curr != NULL) { | |
| 273 if (!curr->is_young() || curr->is_scan_only()) { | |
| 274 gclog_or_tty->print_cr("### SCAN-ONLY REGION "PTR_FORMAT"-"PTR_FORMAT" " | |
| 275 "incorrectly tagged (%d, %d)", | |
| 276 curr->bottom(), curr->end(), | |
| 277 curr->is_young(), curr->is_scan_only()); | |
| 278 scan_only_ret = false; | |
| 279 } | |
| 280 ++length; | |
| 281 last = curr; | |
| 282 curr = curr->get_next_young_region(); | |
| 283 } | |
| 284 scan_only_ret = scan_only_ret && (length == _scan_only_length); | |
| 285 | |
| 286 if ( (last != _scan_only_tail) || | |
| 287 (_scan_only_head == NULL && _scan_only_tail != NULL) || | |
| 288 (_scan_only_head != NULL && _scan_only_tail == NULL) ) { | |
| 289 gclog_or_tty->print_cr("## _scan_only_tail is set incorrectly"); | |
| 290 scan_only_ret = false; | |
| 291 } | |
| 292 | |
| 293 if (_curr_scan_only != NULL && _curr_scan_only != _scan_only_head) { | |
| 294 gclog_or_tty->print_cr("### _curr_scan_only is set incorrectly"); | |
| 295 scan_only_ret = false; | |
| 296 } | |
| 297 | |
| 298 if (!scan_only_ret) { | |
| 299 gclog_or_tty->print_cr("### SCAN-ONLY LIST seems not well formed!"); | |
| 300 gclog_or_tty->print_cr("### list has %d entries, _scan_only_length is %d", | |
| 301 length, _scan_only_length); | |
| 302 } | |
| 303 | |
| 304 return ret && scan_only_ret; | |
| 305 } | |
| 306 | |
| 307 bool YoungList::check_list_empty(bool ignore_scan_only_list, | |
| 308 bool check_sample) { | |
| 309 bool ret = true; | |
| 310 | |
| 311 if (_length != 0) { | |
| 312 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
| 313 _length); | |
| 314 ret = false; | |
| 315 } | |
| 316 if (check_sample && _last_sampled_rs_lengths != 0) { | |
| 317 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
| 318 ret = false; | |
| 319 } | |
| 320 if (_head != NULL) { | |
| 321 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
| 322 ret = false; | |
| 323 } | |
| 324 if (!ret) { | |
| 325 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
| 326 } | |
| 327 | |
| 328 if (ignore_scan_only_list) | |
| 329 return ret; | |
| 330 | |
| 331 bool scan_only_ret = true; | |
| 332 if (_scan_only_length != 0) { | |
| 333 gclog_or_tty->print_cr("### SCAN-ONLY LIST should have 0 length, not %d", | |
| 334 _scan_only_length); | |
| 335 scan_only_ret = false; | |
| 336 } | |
| 337 if (_scan_only_head != NULL) { | |
| 338 gclog_or_tty->print_cr("### SCAN-ONLY LIST does not have a NULL head"); | |
| 339 scan_only_ret = false; | |
| 340 } | |
| 341 if (_scan_only_tail != NULL) { | |
| 342 gclog_or_tty->print_cr("### SCAN-ONLY LIST does not have a NULL tail"); | |
| 343 scan_only_ret = false; | |
| 344 } | |
| 345 if (!scan_only_ret) { | |
| 346 gclog_or_tty->print_cr("### SCAN-ONLY LIST does not seem empty"); | |
| 347 } | |
| 348 | |
| 349 return ret && scan_only_ret; | |
| 350 } | |
| 351 | |
| 352 void | |
| 353 YoungList::rs_length_sampling_init() { | |
| 354 _sampled_rs_lengths = 0; | |
| 355 _curr = _head; | |
| 356 } | |
| 357 | |
| 358 bool | |
| 359 YoungList::rs_length_sampling_more() { | |
| 360 return _curr != NULL; | |
| 361 } | |
| 362 | |
| 363 void | |
| 364 YoungList::rs_length_sampling_next() { | |
| 365 assert( _curr != NULL, "invariant" ); | |
| 366 _sampled_rs_lengths += _curr->rem_set()->occupied(); | |
| 367 _curr = _curr->get_next_young_region(); | |
| 368 if (_curr == NULL) { | |
| 369 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
| 370 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
| 371 } | |
| 372 } | |
| 373 | |
| 374 void | |
| 375 YoungList::reset_auxilary_lists() { | |
| 376 // We could have just "moved" the scan-only list to the young list. | |
| 377 // However, the scan-only list is ordered according to the region | |
| 378 // age in descending order, so, by moving one entry at a time, we | |
| 379 // ensure that it is recreated in ascending order. | |
| 380 | |
| 381 guarantee( is_empty(), "young list should be empty" ); | |
| 382 assert(check_list_well_formed(), "young list should be well formed"); | |
| 383 | |
| 384 // Add survivor regions to SurvRateGroup. | |
| 385 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
| 545 | 386 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
| 342 | 387 for (HeapRegion* curr = _survivor_head; |
| 388 curr != NULL; | |
| 389 curr = curr->get_next_young_region()) { | |
| 390 _g1h->g1_policy()->set_region_survivors(curr); | |
| 391 } | |
| 392 _g1h->g1_policy()->note_stop_adding_survivor_regions(); | |
| 393 | |
| 394 if (_survivor_head != NULL) { | |
| 395 _head = _survivor_head; | |
| 396 _length = _survivor_length + _scan_only_length; | |
| 545 | 397 _survivor_tail->set_next_young_region(_scan_only_head); |
| 342 | 398 } else { |
| 399 _head = _scan_only_head; | |
| 400 _length = _scan_only_length; | |
| 401 } | |
| 402 | |
| 403 for (HeapRegion* curr = _scan_only_head; | |
| 404 curr != NULL; | |
| 405 curr = curr->get_next_young_region()) { | |
| 406 curr->recalculate_age_in_surv_rate_group(); | |
| 407 } | |
| 408 _scan_only_head = NULL; | |
| 409 _scan_only_tail = NULL; | |
| 410 _scan_only_length = 0; | |
| 411 _curr_scan_only = NULL; | |
| 412 | |
| 413 _survivor_head = NULL; | |
| 545 | 414 _survivor_tail = NULL; |
| 342 | 415 _survivor_length = 0; |
| 545 | 416 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
| 342 | 417 |
| 418 assert(check_list_well_formed(), "young list should be well formed"); | |
| 419 } | |
| 420 | |
| 421 void YoungList::print() { | |
| 422 HeapRegion* lists[] = {_head, _scan_only_head, _survivor_head}; | |
| 423 const char* names[] = {"YOUNG", "SCAN-ONLY", "SURVIVOR"}; | |
| 424 | |
| 425 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
| 426 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
| 427 HeapRegion *curr = lists[list]; | |
| 428 if (curr == NULL) | |
| 429 gclog_or_tty->print_cr(" empty"); | |
| 430 while (curr != NULL) { | |
| 431 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
| 432 "age: %4d, y: %d, s-o: %d, surv: %d", | |
| 433 curr->bottom(), curr->end(), | |
| 434 curr->top(), | |
| 435 curr->prev_top_at_mark_start(), | |
| 436 curr->next_top_at_mark_start(), | |
| 437 curr->top_at_conc_mark_count(), | |
| 438 curr->age_in_surv_rate_group_cond(), | |
| 439 curr->is_young(), | |
| 440 curr->is_scan_only(), | |
| 441 curr->is_survivor()); | |
| 442 curr = curr->get_next_young_region(); | |
| 443 } | |
| 444 } | |
| 445 | |
| 446 gclog_or_tty->print_cr(""); | |
| 447 } | |
| 448 | |
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449 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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450 { |
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451 // Claim the right to put the region on the dirty cards region list |
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452 // by installing a self pointer. |
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453 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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454 if (next == NULL) { |
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455 HeapRegion* res = (HeapRegion*) |
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456 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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457 NULL); |
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458 if (res == NULL) { |
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459 HeapRegion* head; |
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460 do { |
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461 // Put the region to the dirty cards region list. |
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462 head = _dirty_cards_region_list; |
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463 next = (HeapRegion*) |
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464 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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465 if (next == head) { |
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466 assert(hr->get_next_dirty_cards_region() == hr, |
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467 "hr->get_next_dirty_cards_region() != hr"); |
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468 if (next == NULL) { |
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469 // The last region in the list points to itself. |
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470 hr->set_next_dirty_cards_region(hr); |
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471 } else { |
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472 hr->set_next_dirty_cards_region(next); |
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473 } |
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474 } |
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475 } while (next != head); |
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476 } |
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477 } |
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478 } |
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479 |
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480 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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481 { |
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482 HeapRegion* head; |
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483 HeapRegion* hr; |
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484 do { |
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485 head = _dirty_cards_region_list; |
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486 if (head == NULL) { |
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487 return NULL; |
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488 } |
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489 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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490 if (head == new_head) { |
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491 // The last region. |
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492 new_head = NULL; |
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493 } |
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494 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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495 head); |
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496 } while (hr != head); |
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497 assert(hr != NULL, "invariant"); |
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498 hr->set_next_dirty_cards_region(NULL); |
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499 return hr; |
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500 } |
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501 |
| 342 | 502 void G1CollectedHeap::stop_conc_gc_threads() { |
| 794 | 503 _cg1r->stop(); |
| 342 | 504 _czft->stop(); |
| 505 _cmThread->stop(); | |
| 506 } | |
| 507 | |
| 508 | |
| 509 void G1CollectedHeap::check_ct_logs_at_safepoint() { | |
| 510 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 511 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
| 512 | |
| 513 // Count the dirty cards at the start. | |
| 514 CountNonCleanMemRegionClosure count1(this); | |
| 515 ct_bs->mod_card_iterate(&count1); | |
| 516 int orig_count = count1.n(); | |
| 517 | |
| 518 // First clear the logged cards. | |
| 519 ClearLoggedCardTableEntryClosure clear; | |
| 520 dcqs.set_closure(&clear); | |
| 521 dcqs.apply_closure_to_all_completed_buffers(); | |
| 522 dcqs.iterate_closure_all_threads(false); | |
| 523 clear.print_histo(); | |
| 524 | |
| 525 // Now ensure that there's no dirty cards. | |
| 526 CountNonCleanMemRegionClosure count2(this); | |
| 527 ct_bs->mod_card_iterate(&count2); | |
| 528 if (count2.n() != 0) { | |
| 529 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
| 530 count2.n(), orig_count); | |
| 531 } | |
| 532 guarantee(count2.n() == 0, "Card table should be clean."); | |
| 533 | |
| 534 RedirtyLoggedCardTableEntryClosure redirty; | |
| 535 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
| 536 dcqs.apply_closure_to_all_completed_buffers(); | |
| 537 dcqs.iterate_closure_all_threads(false); | |
| 538 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
| 539 clear.calls(), orig_count); | |
| 540 guarantee(redirty.calls() == clear.calls(), | |
| 541 "Or else mechanism is broken."); | |
| 542 | |
| 543 CountNonCleanMemRegionClosure count3(this); | |
| 544 ct_bs->mod_card_iterate(&count3); | |
| 545 if (count3.n() != orig_count) { | |
| 546 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
| 547 orig_count, count3.n()); | |
| 548 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
| 549 } | |
| 550 | |
| 551 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 552 } | |
| 553 | |
| 554 // Private class members. | |
| 555 | |
| 556 G1CollectedHeap* G1CollectedHeap::_g1h; | |
| 557 | |
| 558 // Private methods. | |
| 559 | |
| 560 // Finds a HeapRegion that can be used to allocate a given size of block. | |
| 561 | |
| 562 | |
| 563 HeapRegion* G1CollectedHeap::newAllocRegion_work(size_t word_size, | |
| 564 bool do_expand, | |
| 565 bool zero_filled) { | |
| 566 ConcurrentZFThread::note_region_alloc(); | |
| 567 HeapRegion* res = alloc_free_region_from_lists(zero_filled); | |
| 568 if (res == NULL && do_expand) { | |
| 569 expand(word_size * HeapWordSize); | |
| 570 res = alloc_free_region_from_lists(zero_filled); | |
| 571 assert(res == NULL || | |
| 572 (!res->isHumongous() && | |
| 573 (!zero_filled || | |
| 574 res->zero_fill_state() == HeapRegion::Allocated)), | |
| 575 "Alloc Regions must be zero filled (and non-H)"); | |
| 576 } | |
| 577 if (res != NULL && res->is_empty()) _free_regions--; | |
| 578 assert(res == NULL || | |
| 579 (!res->isHumongous() && | |
| 580 (!zero_filled || | |
| 581 res->zero_fill_state() == HeapRegion::Allocated)), | |
| 582 "Non-young alloc Regions must be zero filled (and non-H)"); | |
| 583 | |
| 751 | 584 if (G1PrintRegions) { |
| 342 | 585 if (res != NULL) { |
| 586 gclog_or_tty->print_cr("new alloc region %d:["PTR_FORMAT", "PTR_FORMAT"], " | |
| 587 "top "PTR_FORMAT, | |
| 588 res->hrs_index(), res->bottom(), res->end(), res->top()); | |
| 589 } | |
| 590 } | |
| 591 | |
| 592 return res; | |
| 593 } | |
| 594 | |
| 595 HeapRegion* G1CollectedHeap::newAllocRegionWithExpansion(int purpose, | |
| 596 size_t word_size, | |
| 597 bool zero_filled) { | |
| 598 HeapRegion* alloc_region = NULL; | |
| 599 if (_gc_alloc_region_counts[purpose] < g1_policy()->max_regions(purpose)) { | |
| 600 alloc_region = newAllocRegion_work(word_size, true, zero_filled); | |
| 601 if (purpose == GCAllocForSurvived && alloc_region != NULL) { | |
| 545 | 602 alloc_region->set_survivor(); |
| 342 | 603 } |
| 604 ++_gc_alloc_region_counts[purpose]; | |
| 605 } else { | |
| 606 g1_policy()->note_alloc_region_limit_reached(purpose); | |
| 607 } | |
| 608 return alloc_region; | |
| 609 } | |
| 610 | |
| 611 // If could fit into free regions w/o expansion, try. | |
| 612 // Otherwise, if can expand, do so. | |
| 613 // Otherwise, if using ex regions might help, try with ex given back. | |
| 614 HeapWord* G1CollectedHeap::humongousObjAllocate(size_t word_size) { | |
| 615 assert(regions_accounted_for(), "Region leakage!"); | |
| 616 | |
| 617 // We can't allocate H regions while cleanupComplete is running, since | |
| 618 // some of the regions we find to be empty might not yet be added to the | |
| 619 // unclean list. (If we're already at a safepoint, this call is | |
| 620 // unnecessary, not to mention wrong.) | |
| 621 if (!SafepointSynchronize::is_at_safepoint()) | |
| 622 wait_for_cleanup_complete(); | |
| 623 | |
| 624 size_t num_regions = | |
| 625 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; | |
| 626 | |
| 627 // Special case if < one region??? | |
| 628 | |
| 629 // Remember the ft size. | |
| 630 size_t x_size = expansion_regions(); | |
| 631 | |
| 632 HeapWord* res = NULL; | |
| 633 bool eliminated_allocated_from_lists = false; | |
| 634 | |
| 635 // Can the allocation potentially fit in the free regions? | |
| 636 if (free_regions() >= num_regions) { | |
| 637 res = _hrs->obj_allocate(word_size); | |
| 638 } | |
| 639 if (res == NULL) { | |
| 640 // Try expansion. | |
| 641 size_t fs = _hrs->free_suffix(); | |
| 642 if (fs + x_size >= num_regions) { | |
| 643 expand((num_regions - fs) * HeapRegion::GrainBytes); | |
| 644 res = _hrs->obj_allocate(word_size); | |
| 645 assert(res != NULL, "This should have worked."); | |
| 646 } else { | |
| 647 // Expansion won't help. Are there enough free regions if we get rid | |
| 648 // of reservations? | |
| 649 size_t avail = free_regions(); | |
| 650 if (avail >= num_regions) { | |
| 651 res = _hrs->obj_allocate(word_size); | |
| 652 if (res != NULL) { | |
| 653 remove_allocated_regions_from_lists(); | |
| 654 eliminated_allocated_from_lists = true; | |
| 655 } | |
| 656 } | |
| 657 } | |
| 658 } | |
| 659 if (res != NULL) { | |
| 660 // Increment by the number of regions allocated. | |
| 661 // FIXME: Assumes regions all of size GrainBytes. | |
| 662 #ifndef PRODUCT | |
| 663 mr_bs()->verify_clean_region(MemRegion(res, res + num_regions * | |
| 664 HeapRegion::GrainWords)); | |
| 665 #endif | |
| 666 if (!eliminated_allocated_from_lists) | |
| 667 remove_allocated_regions_from_lists(); | |
| 668 _summary_bytes_used += word_size * HeapWordSize; | |
| 669 _free_regions -= num_regions; | |
| 670 _num_humongous_regions += (int) num_regions; | |
| 671 } | |
| 672 assert(regions_accounted_for(), "Region Leakage"); | |
| 673 return res; | |
| 674 } | |
| 675 | |
| 676 HeapWord* | |
| 677 G1CollectedHeap::attempt_allocation_slow(size_t word_size, | |
| 678 bool permit_collection_pause) { | |
| 679 HeapWord* res = NULL; | |
| 680 HeapRegion* allocated_young_region = NULL; | |
| 681 | |
| 682 assert( SafepointSynchronize::is_at_safepoint() || | |
| 683 Heap_lock->owned_by_self(), "pre condition of the call" ); | |
| 684 | |
| 685 if (isHumongous(word_size)) { | |
| 686 // Allocation of a humongous object can, in a sense, complete a | |
| 687 // partial region, if the previous alloc was also humongous, and | |
| 688 // caused the test below to succeed. | |
| 689 if (permit_collection_pause) | |
| 690 do_collection_pause_if_appropriate(word_size); | |
| 691 res = humongousObjAllocate(word_size); | |
| 692 assert(_cur_alloc_region == NULL | |
| 693 || !_cur_alloc_region->isHumongous(), | |
| 694 "Prevent a regression of this bug."); | |
| 695 | |
| 696 } else { | |
|
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697 // We may have concurrent cleanup working at the time. Wait for it |
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698 // to complete. In the future we would probably want to make the |
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699 // concurrent cleanup truly concurrent by decoupling it from the |
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700 // allocation. |
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701 if (!SafepointSynchronize::is_at_safepoint()) |
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702 wait_for_cleanup_complete(); |
| 342 | 703 // If we do a collection pause, this will be reset to a non-NULL |
| 704 // value. If we don't, nulling here ensures that we allocate a new | |
| 705 // region below. | |
| 706 if (_cur_alloc_region != NULL) { | |
| 707 // We're finished with the _cur_alloc_region. | |
| 708 _summary_bytes_used += _cur_alloc_region->used(); | |
| 709 _cur_alloc_region = NULL; | |
| 710 } | |
| 711 assert(_cur_alloc_region == NULL, "Invariant."); | |
| 712 // Completion of a heap region is perhaps a good point at which to do | |
| 713 // a collection pause. | |
| 714 if (permit_collection_pause) | |
| 715 do_collection_pause_if_appropriate(word_size); | |
| 716 // Make sure we have an allocation region available. | |
| 717 if (_cur_alloc_region == NULL) { | |
| 718 if (!SafepointSynchronize::is_at_safepoint()) | |
| 719 wait_for_cleanup_complete(); | |
| 720 bool next_is_young = should_set_young_locked(); | |
| 721 // If the next region is not young, make sure it's zero-filled. | |
| 722 _cur_alloc_region = newAllocRegion(word_size, !next_is_young); | |
| 723 if (_cur_alloc_region != NULL) { | |
| 724 _summary_bytes_used -= _cur_alloc_region->used(); | |
| 725 if (next_is_young) { | |
| 726 set_region_short_lived_locked(_cur_alloc_region); | |
| 727 allocated_young_region = _cur_alloc_region; | |
| 728 } | |
| 729 } | |
| 730 } | |
| 731 assert(_cur_alloc_region == NULL || !_cur_alloc_region->isHumongous(), | |
| 732 "Prevent a regression of this bug."); | |
| 733 | |
| 734 // Now retry the allocation. | |
| 735 if (_cur_alloc_region != NULL) { | |
| 736 res = _cur_alloc_region->allocate(word_size); | |
| 737 } | |
| 738 } | |
| 739 | |
| 740 // NOTE: fails frequently in PRT | |
| 741 assert(regions_accounted_for(), "Region leakage!"); | |
| 742 | |
| 743 if (res != NULL) { | |
| 744 if (!SafepointSynchronize::is_at_safepoint()) { | |
| 745 assert( permit_collection_pause, "invariant" ); | |
| 746 assert( Heap_lock->owned_by_self(), "invariant" ); | |
| 747 Heap_lock->unlock(); | |
| 748 } | |
| 749 | |
| 750 if (allocated_young_region != NULL) { | |
| 751 HeapRegion* hr = allocated_young_region; | |
| 752 HeapWord* bottom = hr->bottom(); | |
| 753 HeapWord* end = hr->end(); | |
| 754 MemRegion mr(bottom, end); | |
| 755 ((CardTableModRefBS*)_g1h->barrier_set())->dirty(mr); | |
| 756 } | |
| 757 } | |
| 758 | |
| 759 assert( SafepointSynchronize::is_at_safepoint() || | |
| 760 (res == NULL && Heap_lock->owned_by_self()) || | |
| 761 (res != NULL && !Heap_lock->owned_by_self()), | |
| 762 "post condition of the call" ); | |
| 763 | |
| 764 return res; | |
| 765 } | |
| 766 | |
| 767 HeapWord* | |
| 768 G1CollectedHeap::mem_allocate(size_t word_size, | |
| 769 bool is_noref, | |
| 770 bool is_tlab, | |
| 771 bool* gc_overhead_limit_was_exceeded) { | |
| 772 debug_only(check_for_valid_allocation_state()); | |
| 773 assert(no_gc_in_progress(), "Allocation during gc not allowed"); | |
| 774 HeapWord* result = NULL; | |
| 775 | |
| 776 // Loop until the allocation is satisified, | |
| 777 // or unsatisfied after GC. | |
| 778 for (int try_count = 1; /* return or throw */; try_count += 1) { | |
| 779 int gc_count_before; | |
| 780 { | |
| 781 Heap_lock->lock(); | |
| 782 result = attempt_allocation(word_size); | |
| 783 if (result != NULL) { | |
| 784 // attempt_allocation should have unlocked the heap lock | |
| 785 assert(is_in(result), "result not in heap"); | |
| 786 return result; | |
| 787 } | |
| 788 // Read the gc count while the heap lock is held. | |
| 789 gc_count_before = SharedHeap::heap()->total_collections(); | |
| 790 Heap_lock->unlock(); | |
| 791 } | |
| 792 | |
| 793 // Create the garbage collection operation... | |
| 794 VM_G1CollectForAllocation op(word_size, | |
| 795 gc_count_before); | |
| 796 | |
| 797 // ...and get the VM thread to execute it. | |
| 798 VMThread::execute(&op); | |
| 799 if (op.prologue_succeeded()) { | |
| 800 result = op.result(); | |
| 801 assert(result == NULL || is_in(result), "result not in heap"); | |
| 802 return result; | |
| 803 } | |
| 804 | |
| 805 // Give a warning if we seem to be looping forever. | |
| 806 if ((QueuedAllocationWarningCount > 0) && | |
| 807 (try_count % QueuedAllocationWarningCount == 0)) { | |
| 808 warning("G1CollectedHeap::mem_allocate_work retries %d times", | |
| 809 try_count); | |
| 810 } | |
| 811 } | |
| 812 } | |
| 813 | |
| 814 void G1CollectedHeap::abandon_cur_alloc_region() { | |
| 815 if (_cur_alloc_region != NULL) { | |
| 816 // We're finished with the _cur_alloc_region. | |
| 817 if (_cur_alloc_region->is_empty()) { | |
| 818 _free_regions++; | |
| 819 free_region(_cur_alloc_region); | |
| 820 } else { | |
| 821 _summary_bytes_used += _cur_alloc_region->used(); | |
| 822 } | |
| 823 _cur_alloc_region = NULL; | |
| 824 } | |
| 825 } | |
| 826 | |
| 636 | 827 void G1CollectedHeap::abandon_gc_alloc_regions() { |
| 828 // first, make sure that the GC alloc region list is empty (it should!) | |
| 829 assert(_gc_alloc_region_list == NULL, "invariant"); | |
| 830 release_gc_alloc_regions(true /* totally */); | |
| 831 } | |
| 832 | |
| 342 | 833 class PostMCRemSetClearClosure: public HeapRegionClosure { |
| 834 ModRefBarrierSet* _mr_bs; | |
| 835 public: | |
| 836 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 837 bool doHeapRegion(HeapRegion* r) { | |
| 838 r->reset_gc_time_stamp(); | |
| 839 if (r->continuesHumongous()) | |
| 840 return false; | |
| 841 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 842 if (hrrs != NULL) hrrs->clear(); | |
| 843 // You might think here that we could clear just the cards | |
| 844 // corresponding to the used region. But no: if we leave a dirty card | |
| 845 // in a region we might allocate into, then it would prevent that card | |
| 846 // from being enqueued, and cause it to be missed. | |
| 847 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
| 848 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
| 849 return false; | |
| 850 } | |
| 851 }; | |
| 852 | |
| 853 | |
| 854 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
| 855 ModRefBarrierSet* _mr_bs; | |
| 856 public: | |
| 857 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 858 bool doHeapRegion(HeapRegion* r) { | |
| 859 if (r->continuesHumongous()) return false; | |
| 860 if (r->used_region().word_size() != 0) { | |
| 861 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
| 862 } | |
| 863 return false; | |
| 864 } | |
| 865 }; | |
| 866 | |
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867 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
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868 G1CollectedHeap* _g1h; |
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869 UpdateRSOopClosure _cl; |
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870 int _worker_i; |
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871 public: |
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872 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
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873 _cl(g1->g1_rem_set()->as_HRInto_G1RemSet(), worker_i), |
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874 _worker_i(worker_i), |
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875 _g1h(g1) |
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876 { } |
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877 bool doHeapRegion(HeapRegion* r) { |
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878 if (!r->continuesHumongous()) { |
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879 _cl.set_from(r); |
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880 r->oop_iterate(&_cl); |
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881 } |
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882 return false; |
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883 } |
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884 }; |
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885 |
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886 class ParRebuildRSTask: public AbstractGangTask { |
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887 G1CollectedHeap* _g1; |
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888 public: |
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889 ParRebuildRSTask(G1CollectedHeap* g1) |
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890 : AbstractGangTask("ParRebuildRSTask"), |
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891 _g1(g1) |
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892 { } |
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893 |
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894 void work(int i) { |
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895 RebuildRSOutOfRegionClosure rebuild_rs(_g1, i); |
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896 _g1->heap_region_par_iterate_chunked(&rebuild_rs, i, |
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897 HeapRegion::RebuildRSClaimValue); |
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898 } |
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899 }; |
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900 |
| 342 | 901 void G1CollectedHeap::do_collection(bool full, bool clear_all_soft_refs, |
| 902 size_t word_size) { | |
| 903 ResourceMark rm; | |
| 904 | |
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905 if (PrintHeapAtGC) { |
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906 Universe::print_heap_before_gc(); |
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907 } |
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908 |
| 342 | 909 if (full && DisableExplicitGC) { |
| 910 gclog_or_tty->print("\n\n\nDisabling Explicit GC\n\n\n"); | |
| 911 return; | |
| 912 } | |
| 913 | |
| 914 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
| 915 assert(Thread::current() == VMThread::vm_thread(), "should be in vm thread"); | |
| 916 | |
| 917 if (GC_locker::is_active()) { | |
| 918 return; // GC is disabled (e.g. JNI GetXXXCritical operation) | |
| 919 } | |
| 920 | |
| 921 { | |
| 922 IsGCActiveMark x; | |
| 923 | |
| 924 // Timing | |
| 925 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
| 926 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
| 927 TraceTime t(full ? "Full GC (System.gc())" : "Full GC", PrintGC, true, gclog_or_tty); | |
| 928 | |
| 929 double start = os::elapsedTime(); | |
| 930 GCOverheadReporter::recordSTWStart(start); | |
| 931 g1_policy()->record_full_collection_start(); | |
| 932 | |
| 933 gc_prologue(true); | |
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934 increment_total_collections(true /* full gc */); |
| 342 | 935 |
| 936 size_t g1h_prev_used = used(); | |
| 937 assert(used() == recalculate_used(), "Should be equal"); | |
| 938 | |
| 939 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
| 940 HandleMark hm; // Discard invalid handles created during verification | |
| 941 prepare_for_verify(); | |
| 942 gclog_or_tty->print(" VerifyBeforeGC:"); | |
| 943 Universe::verify(true); | |
| 944 } | |
| 945 assert(regions_accounted_for(), "Region leakage!"); | |
| 946 | |
| 947 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 948 | |
| 949 // We want to discover references, but not process them yet. | |
| 950 // This mode is disabled in | |
| 951 // instanceRefKlass::process_discovered_references if the | |
| 952 // generation does some collection work, or | |
| 953 // instanceRefKlass::enqueue_discovered_references if the | |
| 954 // generation returns without doing any work. | |
| 955 ref_processor()->disable_discovery(); | |
| 956 ref_processor()->abandon_partial_discovery(); | |
| 957 ref_processor()->verify_no_references_recorded(); | |
| 958 | |
| 959 // Abandon current iterations of concurrent marking and concurrent | |
| 960 // refinement, if any are in progress. | |
| 961 concurrent_mark()->abort(); | |
| 962 | |
| 963 // Make sure we'll choose a new allocation region afterwards. | |
| 964 abandon_cur_alloc_region(); | |
| 636 | 965 abandon_gc_alloc_regions(); |
| 342 | 966 assert(_cur_alloc_region == NULL, "Invariant."); |
| 967 g1_rem_set()->as_HRInto_G1RemSet()->cleanupHRRS(); | |
| 968 tear_down_region_lists(); | |
| 969 set_used_regions_to_need_zero_fill(); | |
| 970 if (g1_policy()->in_young_gc_mode()) { | |
| 971 empty_young_list(); | |
| 972 g1_policy()->set_full_young_gcs(true); | |
| 973 } | |
| 974 | |
| 975 // Temporarily make reference _discovery_ single threaded (non-MT). | |
| 976 ReferenceProcessorMTMutator rp_disc_ser(ref_processor(), false); | |
| 977 | |
| 978 // Temporarily make refs discovery atomic | |
| 979 ReferenceProcessorAtomicMutator rp_disc_atomic(ref_processor(), true); | |
| 980 | |
| 981 // Temporarily clear _is_alive_non_header | |
| 982 ReferenceProcessorIsAliveMutator rp_is_alive_null(ref_processor(), NULL); | |
| 983 | |
| 984 ref_processor()->enable_discovery(); | |
|
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985 ref_processor()->setup_policy(clear_all_soft_refs); |
| 342 | 986 |
| 987 // Do collection work | |
| 988 { | |
| 989 HandleMark hm; // Discard invalid handles created during gc | |
| 990 G1MarkSweep::invoke_at_safepoint(ref_processor(), clear_all_soft_refs); | |
| 991 } | |
| 992 // Because freeing humongous regions may have added some unclean | |
| 993 // regions, it is necessary to tear down again before rebuilding. | |
| 994 tear_down_region_lists(); | |
| 995 rebuild_region_lists(); | |
| 996 | |
| 997 _summary_bytes_used = recalculate_used(); | |
| 998 | |
| 999 ref_processor()->enqueue_discovered_references(); | |
| 1000 | |
| 1001 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 1002 | |
| 1003 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { | |
| 1004 HandleMark hm; // Discard invalid handles created during verification | |
| 1005 gclog_or_tty->print(" VerifyAfterGC:"); | |
|
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1006 prepare_for_verify(); |
| 342 | 1007 Universe::verify(false); |
| 1008 } | |
| 1009 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); | |
| 1010 | |
| 1011 reset_gc_time_stamp(); | |
| 1012 // Since everything potentially moved, we will clear all remembered | |
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1013 // sets, and clear all cards. Later we will rebuild remebered |
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1014 // sets. We will also reset the GC time stamps of the regions. |
| 342 | 1015 PostMCRemSetClearClosure rs_clear(mr_bs()); |
| 1016 heap_region_iterate(&rs_clear); | |
| 1017 | |
| 1018 // Resize the heap if necessary. | |
| 1019 resize_if_necessary_after_full_collection(full ? 0 : word_size); | |
| 1020 | |
| 1021 if (_cg1r->use_cache()) { | |
| 1022 _cg1r->clear_and_record_card_counts(); | |
| 1023 _cg1r->clear_hot_cache(); | |
| 1024 } | |
| 1025 | |
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1026 // Rebuild remembered sets of all regions. |
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1027 if (ParallelGCThreads > 0) { |
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1028 ParRebuildRSTask rebuild_rs_task(this); |
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1029 assert(check_heap_region_claim_values( |
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1030 HeapRegion::InitialClaimValue), "sanity check"); |
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1031 set_par_threads(workers()->total_workers()); |
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1032 workers()->run_task(&rebuild_rs_task); |
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1033 set_par_threads(0); |
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1034 assert(check_heap_region_claim_values( |
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1035 HeapRegion::RebuildRSClaimValue), "sanity check"); |
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1036 reset_heap_region_claim_values(); |
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1037 } else { |
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1038 RebuildRSOutOfRegionClosure rebuild_rs(this); |
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1039 heap_region_iterate(&rebuild_rs); |
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1040 } |
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1041 |
| 342 | 1042 if (PrintGC) { |
| 1043 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
| 1044 } | |
| 1045 | |
| 1046 if (true) { // FIXME | |
| 1047 // Ask the permanent generation to adjust size for full collections | |
| 1048 perm()->compute_new_size(); | |
| 1049 } | |
| 1050 | |
| 1051 double end = os::elapsedTime(); | |
| 1052 GCOverheadReporter::recordSTWEnd(end); | |
| 1053 g1_policy()->record_full_collection_end(); | |
| 1054 | |
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1055 #ifdef TRACESPINNING |
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1056 ParallelTaskTerminator::print_termination_counts(); |
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1057 #endif |
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1058 |
| 342 | 1059 gc_epilogue(true); |
| 1060 | |
| 794 | 1061 // Discard all rset updates |
| 1062 JavaThread::dirty_card_queue_set().abandon_logs(); | |
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1063 assert(!G1DeferredRSUpdate |
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1064 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
| 342 | 1065 assert(regions_accounted_for(), "Region leakage!"); |
| 1066 } | |
| 1067 | |
| 1068 if (g1_policy()->in_young_gc_mode()) { | |
| 1069 _young_list->reset_sampled_info(); | |
| 1070 assert( check_young_list_empty(false, false), | |
| 1071 "young list should be empty at this point"); | |
| 1072 } | |
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1073 |
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1074 if (PrintHeapAtGC) { |
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1075 Universe::print_heap_after_gc(); |
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1076 } |
| 342 | 1077 } |
| 1078 | |
| 1079 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
| 1080 do_collection(true, clear_all_soft_refs, 0); | |
| 1081 } | |
| 1082 | |
| 1083 // This code is mostly copied from TenuredGeneration. | |
| 1084 void | |
| 1085 G1CollectedHeap:: | |
| 1086 resize_if_necessary_after_full_collection(size_t word_size) { | |
| 1087 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
| 1088 | |
| 1089 // Include the current allocation, if any, and bytes that will be | |
| 1090 // pre-allocated to support collections, as "used". | |
| 1091 const size_t used_after_gc = used(); | |
| 1092 const size_t capacity_after_gc = capacity(); | |
| 1093 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
| 1094 | |
| 1095 // We don't have floating point command-line arguments | |
| 1096 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100; | |
| 1097 const double maximum_used_percentage = 1.0 - minimum_free_percentage; | |
| 1098 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100; | |
| 1099 const double minimum_used_percentage = 1.0 - maximum_free_percentage; | |
| 1100 | |
| 1101 size_t minimum_desired_capacity = (size_t) (used_after_gc / maximum_used_percentage); | |
| 1102 size_t maximum_desired_capacity = (size_t) (used_after_gc / minimum_used_percentage); | |
| 1103 | |
| 1104 // Don't shrink less than the initial size. | |
| 1105 minimum_desired_capacity = | |
| 1106 MAX2(minimum_desired_capacity, | |
| 1107 collector_policy()->initial_heap_byte_size()); | |
| 1108 maximum_desired_capacity = | |
| 1109 MAX2(maximum_desired_capacity, | |
| 1110 collector_policy()->initial_heap_byte_size()); | |
| 1111 | |
| 1112 // We are failing here because minimum_desired_capacity is | |
| 1113 assert(used_after_gc <= minimum_desired_capacity, "sanity check"); | |
| 1114 assert(minimum_desired_capacity <= maximum_desired_capacity, "sanity check"); | |
| 1115 | |
| 1116 if (PrintGC && Verbose) { | |
| 1117 const double free_percentage = ((double)free_after_gc) / capacity(); | |
| 1118 gclog_or_tty->print_cr("Computing new size after full GC "); | |
| 1119 gclog_or_tty->print_cr(" " | |
| 1120 " minimum_free_percentage: %6.2f", | |
| 1121 minimum_free_percentage); | |
| 1122 gclog_or_tty->print_cr(" " | |
| 1123 " maximum_free_percentage: %6.2f", | |
| 1124 maximum_free_percentage); | |
| 1125 gclog_or_tty->print_cr(" " | |
| 1126 " capacity: %6.1fK" | |
| 1127 " minimum_desired_capacity: %6.1fK" | |
| 1128 " maximum_desired_capacity: %6.1fK", | |
| 1129 capacity() / (double) K, | |
| 1130 minimum_desired_capacity / (double) K, | |
| 1131 maximum_desired_capacity / (double) K); | |
| 1132 gclog_or_tty->print_cr(" " | |
| 1133 " free_after_gc : %6.1fK" | |
| 1134 " used_after_gc : %6.1fK", | |
| 1135 free_after_gc / (double) K, | |
| 1136 used_after_gc / (double) K); | |
| 1137 gclog_or_tty->print_cr(" " | |
| 1138 " free_percentage: %6.2f", | |
| 1139 free_percentage); | |
| 1140 } | |
| 1141 if (capacity() < minimum_desired_capacity) { | |
| 1142 // Don't expand unless it's significant | |
| 1143 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
| 1144 expand(expand_bytes); | |
| 1145 if (PrintGC && Verbose) { | |
| 1146 gclog_or_tty->print_cr(" expanding:" | |
| 1147 " minimum_desired_capacity: %6.1fK" | |
| 1148 " expand_bytes: %6.1fK", | |
| 1149 minimum_desired_capacity / (double) K, | |
| 1150 expand_bytes / (double) K); | |
| 1151 } | |
| 1152 | |
| 1153 // No expansion, now see if we want to shrink | |
| 1154 } else if (capacity() > maximum_desired_capacity) { | |
| 1155 // Capacity too large, compute shrinking size | |
| 1156 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
| 1157 shrink(shrink_bytes); | |
| 1158 if (PrintGC && Verbose) { | |
| 1159 gclog_or_tty->print_cr(" " | |
| 1160 " shrinking:" | |
| 1161 " initSize: %.1fK" | |
| 1162 " maximum_desired_capacity: %.1fK", | |
| 1163 collector_policy()->initial_heap_byte_size() / (double) K, | |
| 1164 maximum_desired_capacity / (double) K); | |
| 1165 gclog_or_tty->print_cr(" " | |
| 1166 " shrink_bytes: %.1fK", | |
| 1167 shrink_bytes / (double) K); | |
| 1168 } | |
| 1169 } | |
| 1170 } | |
| 1171 | |
| 1172 | |
| 1173 HeapWord* | |
| 1174 G1CollectedHeap::satisfy_failed_allocation(size_t word_size) { | |
| 1175 HeapWord* result = NULL; | |
| 1176 | |
| 1177 // In a G1 heap, we're supposed to keep allocation from failing by | |
| 1178 // incremental pauses. Therefore, at least for now, we'll favor | |
| 1179 // expansion over collection. (This might change in the future if we can | |
| 1180 // do something smarter than full collection to satisfy a failed alloc.) | |
| 1181 | |
| 1182 result = expand_and_allocate(word_size); | |
| 1183 if (result != NULL) { | |
| 1184 assert(is_in(result), "result not in heap"); | |
| 1185 return result; | |
| 1186 } | |
| 1187 | |
| 1188 // OK, I guess we have to try collection. | |
| 1189 | |
| 1190 do_collection(false, false, word_size); | |
| 1191 | |
| 1192 result = attempt_allocation(word_size, /*permit_collection_pause*/false); | |
| 1193 | |
| 1194 if (result != NULL) { | |
| 1195 assert(is_in(result), "result not in heap"); | |
| 1196 return result; | |
| 1197 } | |
| 1198 | |
| 1199 // Try collecting soft references. | |
| 1200 do_collection(false, true, word_size); | |
| 1201 result = attempt_allocation(word_size, /*permit_collection_pause*/false); | |
| 1202 if (result != NULL) { | |
| 1203 assert(is_in(result), "result not in heap"); | |
| 1204 return result; | |
| 1205 } | |
| 1206 | |
| 1207 // What else? We might try synchronous finalization later. If the total | |
| 1208 // space available is large enough for the allocation, then a more | |
| 1209 // complete compaction phase than we've tried so far might be | |
| 1210 // appropriate. | |
| 1211 return NULL; | |
| 1212 } | |
| 1213 | |
| 1214 // Attempting to expand the heap sufficiently | |
| 1215 // to support an allocation of the given "word_size". If | |
| 1216 // successful, perform the allocation and return the address of the | |
| 1217 // allocated block, or else "NULL". | |
| 1218 | |
| 1219 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
| 1220 size_t expand_bytes = word_size * HeapWordSize; | |
| 1221 if (expand_bytes < MinHeapDeltaBytes) { | |
| 1222 expand_bytes = MinHeapDeltaBytes; | |
| 1223 } | |
| 1224 expand(expand_bytes); | |
| 1225 assert(regions_accounted_for(), "Region leakage!"); | |
| 1226 HeapWord* result = attempt_allocation(word_size, false /* permit_collection_pause */); | |
| 1227 return result; | |
| 1228 } | |
| 1229 | |
| 1230 size_t G1CollectedHeap::free_region_if_totally_empty(HeapRegion* hr) { | |
| 1231 size_t pre_used = 0; | |
| 1232 size_t cleared_h_regions = 0; | |
| 1233 size_t freed_regions = 0; | |
| 1234 UncleanRegionList local_list; | |
| 1235 free_region_if_totally_empty_work(hr, pre_used, cleared_h_regions, | |
| 1236 freed_regions, &local_list); | |
| 1237 | |
| 1238 finish_free_region_work(pre_used, cleared_h_regions, freed_regions, | |
| 1239 &local_list); | |
| 1240 return pre_used; | |
| 1241 } | |
| 1242 | |
| 1243 void | |
| 1244 G1CollectedHeap::free_region_if_totally_empty_work(HeapRegion* hr, | |
| 1245 size_t& pre_used, | |
| 1246 size_t& cleared_h, | |
| 1247 size_t& freed_regions, | |
| 1248 UncleanRegionList* list, | |
| 1249 bool par) { | |
| 1250 assert(!hr->continuesHumongous(), "should have filtered these out"); | |
| 1251 size_t res = 0; | |
| 677 | 1252 if (hr->used() > 0 && hr->garbage_bytes() == hr->used() && |
| 1253 !hr->is_young()) { | |
| 1254 if (G1PolicyVerbose > 0) | |
| 1255 gclog_or_tty->print_cr("Freeing empty region "PTR_FORMAT "(" SIZE_FORMAT " bytes)" | |
| 1256 " during cleanup", hr, hr->used()); | |
| 1257 free_region_work(hr, pre_used, cleared_h, freed_regions, list, par); | |
| 342 | 1258 } |
| 1259 } | |
| 1260 | |
| 1261 // FIXME: both this and shrink could probably be more efficient by | |
| 1262 // doing one "VirtualSpace::expand_by" call rather than several. | |
| 1263 void G1CollectedHeap::expand(size_t expand_bytes) { | |
| 1264 size_t old_mem_size = _g1_storage.committed_size(); | |
| 1265 // We expand by a minimum of 1K. | |
| 1266 expand_bytes = MAX2(expand_bytes, (size_t)K); | |
| 1267 size_t aligned_expand_bytes = | |
| 1268 ReservedSpace::page_align_size_up(expand_bytes); | |
| 1269 aligned_expand_bytes = align_size_up(aligned_expand_bytes, | |
| 1270 HeapRegion::GrainBytes); | |
| 1271 expand_bytes = aligned_expand_bytes; | |
| 1272 while (expand_bytes > 0) { | |
| 1273 HeapWord* base = (HeapWord*)_g1_storage.high(); | |
| 1274 // Commit more storage. | |
| 1275 bool successful = _g1_storage.expand_by(HeapRegion::GrainBytes); | |
| 1276 if (!successful) { | |
| 1277 expand_bytes = 0; | |
| 1278 } else { | |
| 1279 expand_bytes -= HeapRegion::GrainBytes; | |
| 1280 // Expand the committed region. | |
| 1281 HeapWord* high = (HeapWord*) _g1_storage.high(); | |
| 1282 _g1_committed.set_end(high); | |
| 1283 // Create a new HeapRegion. | |
| 1284 MemRegion mr(base, high); | |
| 1285 bool is_zeroed = !_g1_max_committed.contains(base); | |
| 1286 HeapRegion* hr = new HeapRegion(_bot_shared, mr, is_zeroed); | |
| 1287 | |
| 1288 // Now update max_committed if necessary. | |
| 1289 _g1_max_committed.set_end(MAX2(_g1_max_committed.end(), high)); | |
| 1290 | |
| 1291 // Add it to the HeapRegionSeq. | |
| 1292 _hrs->insert(hr); | |
| 1293 // Set the zero-fill state, according to whether it's already | |
| 1294 // zeroed. | |
| 1295 { | |
| 1296 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 1297 if (is_zeroed) { | |
| 1298 hr->set_zero_fill_complete(); | |
| 1299 put_free_region_on_list_locked(hr); | |
| 1300 } else { | |
| 1301 hr->set_zero_fill_needed(); | |
| 1302 put_region_on_unclean_list_locked(hr); | |
| 1303 } | |
| 1304 } | |
| 1305 _free_regions++; | |
| 1306 // And we used up an expansion region to create it. | |
| 1307 _expansion_regions--; | |
| 1308 // Tell the cardtable about it. | |
| 1309 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
| 1310 // And the offset table as well. | |
| 1311 _bot_shared->resize(_g1_committed.word_size()); | |
| 1312 } | |
| 1313 } | |
| 1314 if (Verbose && PrintGC) { | |
| 1315 size_t new_mem_size = _g1_storage.committed_size(); | |
| 1316 gclog_or_tty->print_cr("Expanding garbage-first heap from %ldK by %ldK to %ldK", | |
| 1317 old_mem_size/K, aligned_expand_bytes/K, | |
| 1318 new_mem_size/K); | |
| 1319 } | |
| 1320 } | |
| 1321 | |
| 1322 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) | |
| 1323 { | |
| 1324 size_t old_mem_size = _g1_storage.committed_size(); | |
| 1325 size_t aligned_shrink_bytes = | |
| 1326 ReservedSpace::page_align_size_down(shrink_bytes); | |
| 1327 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
| 1328 HeapRegion::GrainBytes); | |
| 1329 size_t num_regions_deleted = 0; | |
| 1330 MemRegion mr = _hrs->shrink_by(aligned_shrink_bytes, num_regions_deleted); | |
| 1331 | |
| 1332 assert(mr.end() == (HeapWord*)_g1_storage.high(), "Bad shrink!"); | |
| 1333 if (mr.byte_size() > 0) | |
| 1334 _g1_storage.shrink_by(mr.byte_size()); | |
| 1335 assert(mr.start() == (HeapWord*)_g1_storage.high(), "Bad shrink!"); | |
| 1336 | |
| 1337 _g1_committed.set_end(mr.start()); | |
| 1338 _free_regions -= num_regions_deleted; | |
| 1339 _expansion_regions += num_regions_deleted; | |
| 1340 | |
| 1341 // Tell the cardtable about it. | |
| 1342 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
| 1343 | |
| 1344 // And the offset table as well. | |
| 1345 _bot_shared->resize(_g1_committed.word_size()); | |
| 1346 | |
| 1347 HeapRegionRemSet::shrink_heap(n_regions()); | |
| 1348 | |
| 1349 if (Verbose && PrintGC) { | |
| 1350 size_t new_mem_size = _g1_storage.committed_size(); | |
| 1351 gclog_or_tty->print_cr("Shrinking garbage-first heap from %ldK by %ldK to %ldK", | |
| 1352 old_mem_size/K, aligned_shrink_bytes/K, | |
| 1353 new_mem_size/K); | |
| 1354 } | |
| 1355 } | |
| 1356 | |
| 1357 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
| 636 | 1358 release_gc_alloc_regions(true /* totally */); |
| 342 | 1359 tear_down_region_lists(); // We will rebuild them in a moment. |
| 1360 shrink_helper(shrink_bytes); | |
| 1361 rebuild_region_lists(); | |
| 1362 } | |
| 1363 | |
| 1364 // Public methods. | |
| 1365 | |
| 1366 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 1367 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 1368 #endif // _MSC_VER | |
| 1369 | |
| 1370 | |
| 1371 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
| 1372 SharedHeap(policy_), | |
| 1373 _g1_policy(policy_), | |
| 1374 _ref_processor(NULL), | |
| 1375 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), | |
| 1376 _bot_shared(NULL), | |
| 1377 _par_alloc_during_gc_lock(Mutex::leaf, "par alloc during GC lock"), | |
| 1378 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
| 1379 _evac_failure_scan_stack(NULL) , | |
| 1380 _mark_in_progress(false), | |
| 1381 _cg1r(NULL), _czft(NULL), _summary_bytes_used(0), | |
| 1382 _cur_alloc_region(NULL), | |
| 1383 _refine_cte_cl(NULL), | |
| 1384 _free_region_list(NULL), _free_region_list_size(0), | |
| 1385 _free_regions(0), | |
| 1386 _full_collection(false), | |
| 1387 _unclean_region_list(), | |
| 1388 _unclean_regions_coming(false), | |
| 1389 _young_list(new YoungList(this)), | |
| 1390 _gc_time_stamp(0), | |
| 526 | 1391 _surviving_young_words(NULL), |
| 1392 _in_cset_fast_test(NULL), | |
|
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1393 _in_cset_fast_test_base(NULL), |
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1394 _dirty_cards_region_list(NULL) { |
| 342 | 1395 _g1h = this; // To catch bugs. |
| 1396 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
| 1397 vm_exit_during_initialization("Failed necessary allocation."); | |
| 1398 } | |
| 1399 int n_queues = MAX2((int)ParallelGCThreads, 1); | |
| 1400 _task_queues = new RefToScanQueueSet(n_queues); | |
| 1401 | |
| 1402 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
| 1403 assert(n_rem_sets > 0, "Invariant."); | |
| 1404 | |
| 1405 HeapRegionRemSetIterator** iter_arr = | |
| 1406 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
| 1407 for (int i = 0; i < n_queues; i++) { | |
| 1408 iter_arr[i] = new HeapRegionRemSetIterator(); | |
| 1409 } | |
| 1410 _rem_set_iterator = iter_arr; | |
| 1411 | |
| 1412 for (int i = 0; i < n_queues; i++) { | |
| 1413 RefToScanQueue* q = new RefToScanQueue(); | |
| 1414 q->initialize(); | |
| 1415 _task_queues->register_queue(i, q); | |
| 1416 } | |
| 1417 | |
| 1418 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 636 | 1419 _gc_alloc_regions[ap] = NULL; |
| 1420 _gc_alloc_region_counts[ap] = 0; | |
| 1421 _retained_gc_alloc_regions[ap] = NULL; | |
| 1422 // by default, we do not retain a GC alloc region for each ap; | |
| 1423 // we'll override this, when appropriate, below | |
| 1424 _retain_gc_alloc_region[ap] = false; | |
| 1425 } | |
| 1426 | |
| 1427 // We will try to remember the last half-full tenured region we | |
| 1428 // allocated to at the end of a collection so that we can re-use it | |
| 1429 // during the next collection. | |
| 1430 _retain_gc_alloc_region[GCAllocForTenured] = true; | |
| 1431 | |
| 342 | 1432 guarantee(_task_queues != NULL, "task_queues allocation failure."); |
| 1433 } | |
| 1434 | |
| 1435 jint G1CollectedHeap::initialize() { | |
| 1436 os::enable_vtime(); | |
| 1437 | |
| 1438 // Necessary to satisfy locking discipline assertions. | |
| 1439 | |
| 1440 MutexLocker x(Heap_lock); | |
| 1441 | |
| 1442 // While there are no constraints in the GC code that HeapWordSize | |
| 1443 // be any particular value, there are multiple other areas in the | |
| 1444 // system which believe this to be true (e.g. oop->object_size in some | |
| 1445 // cases incorrectly returns the size in wordSize units rather than | |
| 1446 // HeapWordSize). | |
| 1447 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
| 1448 | |
| 1449 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
| 1450 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
| 1451 | |
| 1452 // Ensure that the sizes are properly aligned. | |
| 1453 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1454 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1455 | |
| 1456 // We allocate this in any case, but only do no work if the command line | |
| 1457 // param is off. | |
| 1458 _cg1r = new ConcurrentG1Refine(); | |
| 1459 | |
| 1460 // Reserve the maximum. | |
| 1461 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
| 1462 // Includes the perm-gen. | |
|
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1463 |
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1464 const size_t total_reserved = max_byte_size + pgs->max_size(); |
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1465 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1466 |
| 342 | 1467 ReservedSpace heap_rs(max_byte_size + pgs->max_size(), |
| 1468 HeapRegion::GrainBytes, | |
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1469 false /*ism*/, addr); |
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1470 |
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1471 if (UseCompressedOops) { |
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1472 if (addr != NULL && !heap_rs.is_reserved()) { |
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1473 // Failed to reserve at specified address - the requested memory |
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1474 // region is taken already, for example, by 'java' launcher. |
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1475 // Try again to reserver heap higher. |
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1476 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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1477 ReservedSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1478 false /*ism*/, addr); |
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1479 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1480 // Failed to reserve at specified address again - give up. |
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1481 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1482 assert(addr == NULL, ""); |
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1483 ReservedSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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1484 false /*ism*/, addr); |
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1485 heap_rs = heap_rs1; |
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1486 } else { |
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1487 heap_rs = heap_rs0; |
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1488 } |
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1489 } |
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1490 } |
| 342 | 1491 |
| 1492 if (!heap_rs.is_reserved()) { | |
| 1493 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
| 1494 return JNI_ENOMEM; | |
| 1495 } | |
| 1496 | |
| 1497 // It is important to do this in a way such that concurrent readers can't | |
| 1498 // temporarily think somethings in the heap. (I've actually seen this | |
| 1499 // happen in asserts: DLD.) | |
| 1500 _reserved.set_word_size(0); | |
| 1501 _reserved.set_start((HeapWord*)heap_rs.base()); | |
| 1502 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 1503 | |
| 1504 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
| 1505 | |
| 1506 _num_humongous_regions = 0; | |
| 1507 | |
| 1508 // Create the gen rem set (and barrier set) for the entire reserved region. | |
| 1509 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
| 1510 set_barrier_set(rem_set()->bs()); | |
| 1511 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
| 1512 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
| 1513 } else { | |
| 1514 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
| 1515 return JNI_ENOMEM; | |
| 1516 } | |
| 1517 | |
| 1518 // Also create a G1 rem set. | |
| 1519 if (G1UseHRIntoRS) { | |
| 1520 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { | |
| 1521 _g1_rem_set = new HRInto_G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
| 1522 } else { | |
| 1523 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); | |
| 1524 return JNI_ENOMEM; | |
| 1525 } | |
| 1526 } else { | |
| 1527 _g1_rem_set = new StupidG1RemSet(this); | |
| 1528 } | |
| 1529 | |
| 1530 // Carve out the G1 part of the heap. | |
| 1531 | |
| 1532 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
| 1533 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
| 1534 g1_rs.size()/HeapWordSize); | |
| 1535 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
| 1536 | |
| 1537 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
| 1538 | |
| 1539 _g1_storage.initialize(g1_rs, 0); | |
| 1540 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
| 1541 _g1_max_committed = _g1_committed; | |
| 393 | 1542 _hrs = new HeapRegionSeq(_expansion_regions); |
| 342 | 1543 guarantee(_hrs != NULL, "Couldn't allocate HeapRegionSeq"); |
| 1544 guarantee(_cur_alloc_region == NULL, "from constructor"); | |
| 1545 | |
|
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1546 // 6843694 - ensure that the maximum region index can fit |
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1547 // in the remembered set structures. |
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1548 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
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1549 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
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1550 |
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1551 const size_t cards_per_region = HeapRegion::GrainBytes >> CardTableModRefBS::card_shift; |
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1552 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
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1553 guarantee(cards_per_region < max_cards_per_region, "too many cards per region"); |
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1554 |
| 342 | 1555 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
| 1556 heap_word_size(init_byte_size)); | |
| 1557 | |
| 1558 _g1h = this; | |
| 1559 | |
| 1560 // Create the ConcurrentMark data structure and thread. | |
| 1561 // (Must do this late, so that "max_regions" is defined.) | |
| 1562 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
| 1563 _cmThread = _cm->cmThread(); | |
| 1564 | |
| 1565 // ...and the concurrent zero-fill thread, if necessary. | |
| 1566 if (G1ConcZeroFill) { | |
| 1567 _czft = new ConcurrentZFThread(); | |
| 1568 } | |
| 1569 | |
| 1570 // Initialize the from_card cache structure of HeapRegionRemSet. | |
| 1571 HeapRegionRemSet::init_heap(max_regions()); | |
| 1572 | |
| 677 | 1573 // Now expand into the initial heap size. |
| 1574 expand(init_byte_size); | |
| 342 | 1575 |
| 1576 // Perform any initialization actions delegated to the policy. | |
| 1577 g1_policy()->init(); | |
| 1578 | |
| 1579 g1_policy()->note_start_of_mark_thread(); | |
| 1580 | |
| 1581 _refine_cte_cl = | |
| 1582 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
| 1583 g1_rem_set(), | |
| 1584 concurrent_g1_refine()); | |
| 1585 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 1586 | |
| 1587 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
| 1588 SATB_Q_FL_lock, | |
| 1589 0, | |
| 1590 Shared_SATB_Q_lock); | |
| 794 | 1591 |
| 1592 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
| 1593 DirtyCardQ_FL_lock, | |
| 1594 G1DirtyCardQueueMax, | |
| 1595 Shared_DirtyCardQ_lock); | |
| 1596 | |
|
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1597 if (G1DeferredRSUpdate) { |
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1598 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
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1599 DirtyCardQ_FL_lock, |
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1600 0, |
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1601 Shared_DirtyCardQ_lock, |
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1602 &JavaThread::dirty_card_queue_set()); |
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1603 } |
| 342 | 1604 // In case we're keeping closure specialization stats, initialize those |
| 1605 // counts and that mechanism. | |
| 1606 SpecializationStats::clear(); | |
| 1607 | |
| 1608 _gc_alloc_region_list = NULL; | |
| 1609 | |
| 1610 // Do later initialization work for concurrent refinement. | |
| 1611 _cg1r->init(); | |
| 1612 | |
| 1613 const char* group_names[] = { "CR", "ZF", "CM", "CL" }; | |
| 1614 GCOverheadReporter::initGCOverheadReporter(4, group_names); | |
| 1615 | |
| 1616 return JNI_OK; | |
| 1617 } | |
| 1618 | |
| 1619 void G1CollectedHeap::ref_processing_init() { | |
| 1620 SharedHeap::ref_processing_init(); | |
| 1621 MemRegion mr = reserved_region(); | |
| 1622 _ref_processor = ReferenceProcessor::create_ref_processor( | |
| 1623 mr, // span | |
| 1624 false, // Reference discovery is not atomic | |
| 1625 // (though it shouldn't matter here.) | |
| 1626 true, // mt_discovery | |
| 1627 NULL, // is alive closure: need to fill this in for efficiency | |
| 1628 ParallelGCThreads, | |
| 1629 ParallelRefProcEnabled, | |
| 1630 true); // Setting next fields of discovered | |
| 1631 // lists requires a barrier. | |
| 1632 } | |
| 1633 | |
| 1634 size_t G1CollectedHeap::capacity() const { | |
| 1635 return _g1_committed.byte_size(); | |
| 1636 } | |
| 1637 | |
| 1638 void G1CollectedHeap::iterate_dirty_card_closure(bool concurrent, | |
| 1639 int worker_i) { | |
| 1640 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 1641 int n_completed_buffers = 0; | |
| 1642 while (dcqs.apply_closure_to_completed_buffer(worker_i, 0, true)) { | |
| 1643 n_completed_buffers++; | |
| 1644 } | |
| 1645 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
| 1646 (double) n_completed_buffers); | |
| 1647 dcqs.clear_n_completed_buffers(); | |
| 1648 // Finish up the queue... | |
| 1649 if (worker_i == 0) concurrent_g1_refine()->clean_up_cache(worker_i, | |
| 1650 g1_rem_set()); | |
| 1651 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
| 1652 } | |
| 1653 | |
| 1654 | |
| 1655 // Computes the sum of the storage used by the various regions. | |
| 1656 | |
| 1657 size_t G1CollectedHeap::used() const { | |
| 1658 assert(Heap_lock->owner() != NULL, | |
| 1659 "Should be owned on this thread's behalf."); | |
| 1660 size_t result = _summary_bytes_used; | |
| 1661 if (_cur_alloc_region != NULL) | |
| 1662 result += _cur_alloc_region->used(); | |
| 1663 return result; | |
| 1664 } | |
| 1665 | |
| 1666 class SumUsedClosure: public HeapRegionClosure { | |
| 1667 size_t _used; | |
| 1668 public: | |
| 1669 SumUsedClosure() : _used(0) {} | |
| 1670 bool doHeapRegion(HeapRegion* r) { | |
| 1671 if (!r->continuesHumongous()) { | |
| 1672 _used += r->used(); | |
| 1673 } | |
| 1674 return false; | |
| 1675 } | |
| 1676 size_t result() { return _used; } | |
| 1677 }; | |
| 1678 | |
| 1679 size_t G1CollectedHeap::recalculate_used() const { | |
| 1680 SumUsedClosure blk; | |
| 1681 _hrs->iterate(&blk); | |
| 1682 return blk.result(); | |
| 1683 } | |
| 1684 | |
| 1685 #ifndef PRODUCT | |
| 1686 class SumUsedRegionsClosure: public HeapRegionClosure { | |
| 1687 size_t _num; | |
| 1688 public: | |
| 677 | 1689 SumUsedRegionsClosure() : _num(0) {} |
| 342 | 1690 bool doHeapRegion(HeapRegion* r) { |
| 1691 if (r->continuesHumongous() || r->used() > 0 || r->is_gc_alloc_region()) { | |
| 1692 _num += 1; | |
| 1693 } | |
| 1694 return false; | |
| 1695 } | |
| 1696 size_t result() { return _num; } | |
| 1697 }; | |
| 1698 | |
| 1699 size_t G1CollectedHeap::recalculate_used_regions() const { | |
| 1700 SumUsedRegionsClosure blk; | |
| 1701 _hrs->iterate(&blk); | |
| 1702 return blk.result(); | |
| 1703 } | |
| 1704 #endif // PRODUCT | |
| 1705 | |
| 1706 size_t G1CollectedHeap::unsafe_max_alloc() { | |
| 1707 if (_free_regions > 0) return HeapRegion::GrainBytes; | |
| 1708 // otherwise, is there space in the current allocation region? | |
| 1709 | |
| 1710 // We need to store the current allocation region in a local variable | |
| 1711 // here. The problem is that this method doesn't take any locks and | |
| 1712 // there may be other threads which overwrite the current allocation | |
| 1713 // region field. attempt_allocation(), for example, sets it to NULL | |
| 1714 // and this can happen *after* the NULL check here but before the call | |
| 1715 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
| 1716 // to be a problem in the optimized build, since the two loads of the | |
| 1717 // current allocation region field are optimized away. | |
| 1718 HeapRegion* car = _cur_alloc_region; | |
| 1719 | |
| 1720 // FIXME: should iterate over all regions? | |
| 1721 if (car == NULL) { | |
| 1722 return 0; | |
| 1723 } | |
| 1724 return car->free(); | |
| 1725 } | |
| 1726 | |
| 1727 void G1CollectedHeap::collect(GCCause::Cause cause) { | |
| 1728 // The caller doesn't have the Heap_lock | |
| 1729 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
| 1730 MutexLocker ml(Heap_lock); | |
| 1731 collect_locked(cause); | |
| 1732 } | |
| 1733 | |
| 1734 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { | |
| 1735 assert(Thread::current()->is_VM_thread(), "Precondition#1"); | |
| 1736 assert(Heap_lock->is_locked(), "Precondition#2"); | |
| 1737 GCCauseSetter gcs(this, cause); | |
| 1738 switch (cause) { | |
| 1739 case GCCause::_heap_inspection: | |
| 1740 case GCCause::_heap_dump: { | |
| 1741 HandleMark hm; | |
| 1742 do_full_collection(false); // don't clear all soft refs | |
| 1743 break; | |
| 1744 } | |
| 1745 default: // XXX FIX ME | |
| 1746 ShouldNotReachHere(); // Unexpected use of this function | |
| 1747 } | |
| 1748 } | |
| 1749 | |
| 1750 | |
| 1751 void G1CollectedHeap::collect_locked(GCCause::Cause cause) { | |
| 1752 // Don't want to do a GC until cleanup is completed. | |
| 1753 wait_for_cleanup_complete(); | |
| 1754 | |
| 1755 // Read the GC count while holding the Heap_lock | |
| 1756 int gc_count_before = SharedHeap::heap()->total_collections(); | |
| 1757 { | |
| 1758 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
| 1759 VM_G1CollectFull op(gc_count_before, cause); | |
| 1760 VMThread::execute(&op); | |
| 1761 } | |
| 1762 } | |
| 1763 | |
| 1764 bool G1CollectedHeap::is_in(const void* p) const { | |
| 1765 if (_g1_committed.contains(p)) { | |
| 1766 HeapRegion* hr = _hrs->addr_to_region(p); | |
| 1767 return hr->is_in(p); | |
| 1768 } else { | |
| 1769 return _perm_gen->as_gen()->is_in(p); | |
| 1770 } | |
| 1771 } | |
| 1772 | |
| 1773 // Iteration functions. | |
| 1774 | |
| 1775 // Iterates an OopClosure over all ref-containing fields of objects | |
| 1776 // within a HeapRegion. | |
| 1777 | |
| 1778 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
| 1779 MemRegion _mr; | |
| 1780 OopClosure* _cl; | |
| 1781 public: | |
| 1782 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
| 1783 : _mr(mr), _cl(cl) {} | |
| 1784 bool doHeapRegion(HeapRegion* r) { | |
| 1785 if (! r->continuesHumongous()) { | |
| 1786 r->oop_iterate(_cl); | |
| 1787 } | |
| 1788 return false; | |
| 1789 } | |
| 1790 }; | |
| 1791 | |
| 678 | 1792 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
| 342 | 1793 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
| 1794 _hrs->iterate(&blk); | |
| 678 | 1795 if (do_perm) { |
| 1796 perm_gen()->oop_iterate(cl); | |
| 1797 } | |
| 342 | 1798 } |
| 1799 | |
| 678 | 1800 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
| 342 | 1801 IterateOopClosureRegionClosure blk(mr, cl); |
| 1802 _hrs->iterate(&blk); | |
| 678 | 1803 if (do_perm) { |
| 1804 perm_gen()->oop_iterate(cl); | |
| 1805 } | |
| 342 | 1806 } |
| 1807 | |
| 1808 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
| 1809 | |
| 1810 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
| 1811 ObjectClosure* _cl; | |
| 1812 public: | |
| 1813 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
| 1814 bool doHeapRegion(HeapRegion* r) { | |
| 1815 if (! r->continuesHumongous()) { | |
| 1816 r->object_iterate(_cl); | |
| 1817 } | |
| 1818 return false; | |
| 1819 } | |
| 1820 }; | |
| 1821 | |
| 678 | 1822 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
| 342 | 1823 IterateObjectClosureRegionClosure blk(cl); |
| 1824 _hrs->iterate(&blk); | |
| 678 | 1825 if (do_perm) { |
| 1826 perm_gen()->object_iterate(cl); | |
| 1827 } | |
| 342 | 1828 } |
| 1829 | |
| 1830 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
| 1831 // FIXME: is this right? | |
| 1832 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
| 1833 } | |
| 1834 | |
| 1835 // Calls a SpaceClosure on a HeapRegion. | |
| 1836 | |
| 1837 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
| 1838 SpaceClosure* _cl; | |
| 1839 public: | |
| 1840 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
| 1841 bool doHeapRegion(HeapRegion* r) { | |
| 1842 _cl->do_space(r); | |
| 1843 return false; | |
| 1844 } | |
| 1845 }; | |
| 1846 | |
| 1847 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
| 1848 SpaceClosureRegionClosure blk(cl); | |
| 1849 _hrs->iterate(&blk); | |
| 1850 } | |
| 1851 | |
| 1852 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) { | |
| 1853 _hrs->iterate(cl); | |
| 1854 } | |
| 1855 | |
| 1856 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
| 1857 HeapRegionClosure* cl) { | |
| 1858 _hrs->iterate_from(r, cl); | |
| 1859 } | |
| 1860 | |
| 1861 void | |
| 1862 G1CollectedHeap::heap_region_iterate_from(int idx, HeapRegionClosure* cl) { | |
| 1863 _hrs->iterate_from(idx, cl); | |
| 1864 } | |
| 1865 | |
| 1866 HeapRegion* G1CollectedHeap::region_at(size_t idx) { return _hrs->at(idx); } | |
| 1867 | |
| 1868 void | |
| 1869 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
| 1870 int worker, | |
| 1871 jint claim_value) { | |
| 355 | 1872 const size_t regions = n_regions(); |
| 1873 const size_t worker_num = (ParallelGCThreads > 0 ? ParallelGCThreads : 1); | |
| 1874 // try to spread out the starting points of the workers | |
| 1875 const size_t start_index = regions / worker_num * (size_t) worker; | |
| 1876 | |
| 1877 // each worker will actually look at all regions | |
| 1878 for (size_t count = 0; count < regions; ++count) { | |
| 1879 const size_t index = (start_index + count) % regions; | |
| 1880 assert(0 <= index && index < regions, "sanity"); | |
| 1881 HeapRegion* r = region_at(index); | |
| 1882 // we'll ignore "continues humongous" regions (we'll process them | |
| 1883 // when we come across their corresponding "start humongous" | |
| 1884 // region) and regions already claimed | |
| 1885 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
| 1886 continue; | |
| 1887 } | |
| 1888 // OK, try to claim it | |
| 342 | 1889 if (r->claimHeapRegion(claim_value)) { |
| 355 | 1890 // success! |
| 1891 assert(!r->continuesHumongous(), "sanity"); | |
| 1892 if (r->startsHumongous()) { | |
| 1893 // If the region is "starts humongous" we'll iterate over its | |
| 1894 // "continues humongous" first; in fact we'll do them | |
| 1895 // first. The order is important. In on case, calling the | |
| 1896 // closure on the "starts humongous" region might de-allocate | |
| 1897 // and clear all its "continues humongous" regions and, as a | |
| 1898 // result, we might end up processing them twice. So, we'll do | |
| 1899 // them first (notice: most closures will ignore them anyway) and | |
| 1900 // then we'll do the "starts humongous" region. | |
| 1901 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
| 1902 HeapRegion* chr = region_at(ch_index); | |
| 1903 | |
| 1904 // if the region has already been claimed or it's not | |
| 1905 // "continues humongous" we're done | |
| 1906 if (chr->claim_value() == claim_value || | |
| 1907 !chr->continuesHumongous()) { | |
| 1908 break; | |
| 1909 } | |
| 1910 | |
| 1911 // Noone should have claimed it directly. We can given | |
| 1912 // that we claimed its "starts humongous" region. | |
| 1913 assert(chr->claim_value() != claim_value, "sanity"); | |
| 1914 assert(chr->humongous_start_region() == r, "sanity"); | |
| 1915 | |
| 1916 if (chr->claimHeapRegion(claim_value)) { | |
| 1917 // we should always be able to claim it; noone else should | |
| 1918 // be trying to claim this region | |
| 1919 | |
| 1920 bool res2 = cl->doHeapRegion(chr); | |
| 1921 assert(!res2, "Should not abort"); | |
| 1922 | |
| 1923 // Right now, this holds (i.e., no closure that actually | |
| 1924 // does something with "continues humongous" regions | |
| 1925 // clears them). We might have to weaken it in the future, | |
| 1926 // but let's leave these two asserts here for extra safety. | |
| 1927 assert(chr->continuesHumongous(), "should still be the case"); | |
| 1928 assert(chr->humongous_start_region() == r, "sanity"); | |
| 1929 } else { | |
| 1930 guarantee(false, "we should not reach here"); | |
| 1931 } | |
| 1932 } | |
| 1933 } | |
| 1934 | |
| 1935 assert(!r->continuesHumongous(), "sanity"); | |
| 1936 bool res = cl->doHeapRegion(r); | |
| 1937 assert(!res, "Should not abort"); | |
| 1938 } | |
| 1939 } | |
| 1940 } | |
| 1941 | |
| 390 | 1942 class ResetClaimValuesClosure: public HeapRegionClosure { |
| 1943 public: | |
| 1944 bool doHeapRegion(HeapRegion* r) { | |
| 1945 r->set_claim_value(HeapRegion::InitialClaimValue); | |
| 1946 return false; | |
| 1947 } | |
| 1948 }; | |
| 1949 | |
| 1950 void | |
| 1951 G1CollectedHeap::reset_heap_region_claim_values() { | |
| 1952 ResetClaimValuesClosure blk; | |
| 1953 heap_region_iterate(&blk); | |
| 1954 } | |
| 1955 | |
| 355 | 1956 #ifdef ASSERT |
| 1957 // This checks whether all regions in the heap have the correct claim | |
| 1958 // value. I also piggy-backed on this a check to ensure that the | |
| 1959 // humongous_start_region() information on "continues humongous" | |
| 1960 // regions is correct. | |
| 1961 | |
| 1962 class CheckClaimValuesClosure : public HeapRegionClosure { | |
| 1963 private: | |
| 1964 jint _claim_value; | |
| 1965 size_t _failures; | |
| 1966 HeapRegion* _sh_region; | |
| 1967 public: | |
| 1968 CheckClaimValuesClosure(jint claim_value) : | |
| 1969 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
| 1970 bool doHeapRegion(HeapRegion* r) { | |
| 1971 if (r->claim_value() != _claim_value) { | |
| 1972 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
| 1973 "claim value = %d, should be %d", | |
| 1974 r->bottom(), r->end(), r->claim_value(), | |
| 1975 _claim_value); | |
| 1976 ++_failures; | |
| 1977 } | |
| 1978 if (!r->isHumongous()) { | |
| 1979 _sh_region = NULL; | |
| 1980 } else if (r->startsHumongous()) { | |
| 1981 _sh_region = r; | |
| 1982 } else if (r->continuesHumongous()) { | |
| 1983 if (r->humongous_start_region() != _sh_region) { | |
| 1984 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
| 1985 "HS = "PTR_FORMAT", should be "PTR_FORMAT, | |
| 1986 r->bottom(), r->end(), | |
| 1987 r->humongous_start_region(), | |
| 1988 _sh_region); | |
| 1989 ++_failures; | |
| 342 | 1990 } |
| 1991 } | |
| 355 | 1992 return false; |
| 1993 } | |
| 1994 size_t failures() { | |
| 1995 return _failures; | |
| 1996 } | |
| 1997 }; | |
| 1998 | |
| 1999 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
| 2000 CheckClaimValuesClosure cl(claim_value); | |
| 2001 heap_region_iterate(&cl); | |
| 2002 return cl.failures() == 0; | |
| 2003 } | |
| 2004 #endif // ASSERT | |
| 342 | 2005 |
| 2006 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { | |
| 2007 HeapRegion* r = g1_policy()->collection_set(); | |
| 2008 while (r != NULL) { | |
| 2009 HeapRegion* next = r->next_in_collection_set(); | |
| 2010 if (cl->doHeapRegion(r)) { | |
| 2011 cl->incomplete(); | |
| 2012 return; | |
| 2013 } | |
| 2014 r = next; | |
| 2015 } | |
| 2016 } | |
| 2017 | |
| 2018 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
| 2019 HeapRegionClosure *cl) { | |
| 2020 assert(r->in_collection_set(), | |
| 2021 "Start region must be a member of the collection set."); | |
| 2022 HeapRegion* cur = r; | |
| 2023 while (cur != NULL) { | |
| 2024 HeapRegion* next = cur->next_in_collection_set(); | |
| 2025 if (cl->doHeapRegion(cur) && false) { | |
| 2026 cl->incomplete(); | |
| 2027 return; | |
| 2028 } | |
| 2029 cur = next; | |
| 2030 } | |
| 2031 cur = g1_policy()->collection_set(); | |
| 2032 while (cur != r) { | |
| 2033 HeapRegion* next = cur->next_in_collection_set(); | |
| 2034 if (cl->doHeapRegion(cur) && false) { | |
| 2035 cl->incomplete(); | |
| 2036 return; | |
| 2037 } | |
| 2038 cur = next; | |
| 2039 } | |
| 2040 } | |
| 2041 | |
| 2042 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
| 2043 return _hrs->length() > 0 ? _hrs->at(0) : NULL; | |
| 2044 } | |
| 2045 | |
| 2046 | |
| 2047 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
| 2048 Space* res = heap_region_containing(addr); | |
| 2049 if (res == NULL) | |
| 2050 res = perm_gen()->space_containing(addr); | |
| 2051 return res; | |
| 2052 } | |
| 2053 | |
| 2054 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
| 2055 Space* sp = space_containing(addr); | |
| 2056 if (sp != NULL) { | |
| 2057 return sp->block_start(addr); | |
| 2058 } | |
| 2059 return NULL; | |
| 2060 } | |
| 2061 | |
| 2062 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
| 2063 Space* sp = space_containing(addr); | |
| 2064 assert(sp != NULL, "block_size of address outside of heap"); | |
| 2065 return sp->block_size(addr); | |
| 2066 } | |
| 2067 | |
| 2068 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
| 2069 Space* sp = space_containing(addr); | |
| 2070 return sp->block_is_obj(addr); | |
| 2071 } | |
| 2072 | |
| 2073 bool G1CollectedHeap::supports_tlab_allocation() const { | |
| 2074 return true; | |
| 2075 } | |
| 2076 | |
| 2077 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
| 2078 return HeapRegion::GrainBytes; | |
| 2079 } | |
| 2080 | |
| 2081 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
| 2082 // Return the remaining space in the cur alloc region, but not less than | |
| 2083 // the min TLAB size. | |
| 2084 // Also, no more than half the region size, since we can't allow tlabs to | |
| 2085 // grow big enough to accomodate humongous objects. | |
| 2086 | |
| 2087 // We need to story it locally, since it might change between when we | |
| 2088 // test for NULL and when we use it later. | |
| 2089 ContiguousSpace* cur_alloc_space = _cur_alloc_region; | |
| 2090 if (cur_alloc_space == NULL) { | |
| 2091 return HeapRegion::GrainBytes/2; | |
| 2092 } else { | |
| 2093 return MAX2(MIN2(cur_alloc_space->free(), | |
| 2094 (size_t)(HeapRegion::GrainBytes/2)), | |
| 2095 (size_t)MinTLABSize); | |
| 2096 } | |
| 2097 } | |
| 2098 | |
| 2099 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t size) { | |
| 2100 bool dummy; | |
| 2101 return G1CollectedHeap::mem_allocate(size, false, true, &dummy); | |
| 2102 } | |
| 2103 | |
| 2104 bool G1CollectedHeap::allocs_are_zero_filled() { | |
| 2105 return false; | |
| 2106 } | |
| 2107 | |
| 2108 size_t G1CollectedHeap::large_typearray_limit() { | |
| 2109 // FIXME | |
| 2110 return HeapRegion::GrainBytes/HeapWordSize; | |
| 2111 } | |
| 2112 | |
| 2113 size_t G1CollectedHeap::max_capacity() const { | |
| 2114 return _g1_committed.byte_size(); | |
| 2115 } | |
| 2116 | |
| 2117 jlong G1CollectedHeap::millis_since_last_gc() { | |
| 2118 // assert(false, "NYI"); | |
| 2119 return 0; | |
| 2120 } | |
| 2121 | |
| 2122 | |
| 2123 void G1CollectedHeap::prepare_for_verify() { | |
| 2124 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
| 2125 ensure_parsability(false); | |
| 2126 } | |
| 2127 g1_rem_set()->prepare_for_verify(); | |
| 2128 } | |
| 2129 | |
| 2130 class VerifyLivenessOopClosure: public OopClosure { | |
| 2131 G1CollectedHeap* g1h; | |
| 2132 public: | |
| 2133 VerifyLivenessOopClosure(G1CollectedHeap* _g1h) { | |
| 2134 g1h = _g1h; | |
| 2135 } | |
| 2136 void do_oop(narrowOop *p) { | |
| 2137 guarantee(false, "NYI"); | |
| 2138 } | |
| 2139 void do_oop(oop *p) { | |
| 2140 oop obj = *p; | |
| 2141 assert(obj == NULL || !g1h->is_obj_dead(obj), | |
| 2142 "Dead object referenced by a not dead object"); | |
| 2143 } | |
| 2144 }; | |
| 2145 | |
| 2146 class VerifyObjsInRegionClosure: public ObjectClosure { | |
| 811 | 2147 private: |
| 342 | 2148 G1CollectedHeap* _g1h; |
| 2149 size_t _live_bytes; | |
| 2150 HeapRegion *_hr; | |
| 811 | 2151 bool _use_prev_marking; |
| 342 | 2152 public: |
| 811 | 2153 // use_prev_marking == true -> use "prev" marking information, |
| 2154 // use_prev_marking == false -> use "next" marking information | |
| 2155 VerifyObjsInRegionClosure(HeapRegion *hr, bool use_prev_marking) | |
| 2156 : _live_bytes(0), _hr(hr), _use_prev_marking(use_prev_marking) { | |
| 342 | 2157 _g1h = G1CollectedHeap::heap(); |
| 2158 } | |
| 2159 void do_object(oop o) { | |
| 2160 VerifyLivenessOopClosure isLive(_g1h); | |
| 2161 assert(o != NULL, "Huh?"); | |
| 811 | 2162 if (!_g1h->is_obj_dead_cond(o, _use_prev_marking)) { |
| 342 | 2163 o->oop_iterate(&isLive); |
| 2164 if (!_hr->obj_allocated_since_prev_marking(o)) | |
| 2165 _live_bytes += (o->size() * HeapWordSize); | |
| 2166 } | |
| 2167 } | |
| 2168 size_t live_bytes() { return _live_bytes; } | |
| 2169 }; | |
| 2170 | |
| 2171 class PrintObjsInRegionClosure : public ObjectClosure { | |
| 2172 HeapRegion *_hr; | |
| 2173 G1CollectedHeap *_g1; | |
| 2174 public: | |
| 2175 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
| 2176 _g1 = G1CollectedHeap::heap(); | |
| 2177 }; | |
| 2178 | |
| 2179 void do_object(oop o) { | |
| 2180 if (o != NULL) { | |
| 2181 HeapWord *start = (HeapWord *) o; | |
| 2182 size_t word_sz = o->size(); | |
| 2183 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
| 2184 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
| 2185 (void*) o, word_sz, | |
| 2186 _g1->isMarkedPrev(o), | |
| 2187 _g1->isMarkedNext(o), | |
| 2188 _hr->obj_allocated_since_prev_marking(o)); | |
| 2189 HeapWord *end = start + word_sz; | |
| 2190 HeapWord *cur; | |
| 2191 int *val; | |
| 2192 for (cur = start; cur < end; cur++) { | |
| 2193 val = (int *) cur; | |
| 2194 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
| 2195 } | |
| 2196 } | |
| 2197 } | |
| 2198 }; | |
| 2199 | |
| 2200 class VerifyRegionClosure: public HeapRegionClosure { | |
| 811 | 2201 private: |
| 342 | 2202 bool _allow_dirty; |
| 390 | 2203 bool _par; |
| 811 | 2204 bool _use_prev_marking; |
| 2205 public: | |
| 2206 // use_prev_marking == true -> use "prev" marking information, | |
| 2207 // use_prev_marking == false -> use "next" marking information | |
| 2208 VerifyRegionClosure(bool allow_dirty, bool par, bool use_prev_marking) | |
| 2209 : _allow_dirty(allow_dirty), _par(par), | |
| 2210 _use_prev_marking(use_prev_marking) {} | |
| 342 | 2211 bool doHeapRegion(HeapRegion* r) { |
| 390 | 2212 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
| 2213 "Should be unclaimed at verify points."); | |
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2214 if (!r->continuesHumongous()) { |
| 811 | 2215 VerifyObjsInRegionClosure not_dead_yet_cl(r, _use_prev_marking); |
| 2216 r->verify(_allow_dirty, _use_prev_marking); | |
| 342 | 2217 r->object_iterate(¬_dead_yet_cl); |
| 2218 guarantee(r->max_live_bytes() >= not_dead_yet_cl.live_bytes(), | |
| 2219 "More live objects than counted in last complete marking."); | |
| 2220 } | |
| 2221 return false; | |
| 2222 } | |
| 2223 }; | |
| 2224 | |
| 2225 class VerifyRootsClosure: public OopsInGenClosure { | |
| 2226 private: | |
| 2227 G1CollectedHeap* _g1h; | |
| 2228 bool _failures; | |
| 811 | 2229 bool _use_prev_marking; |
| 342 | 2230 public: |
| 811 | 2231 // use_prev_marking == true -> use "prev" marking information, |
| 2232 // use_prev_marking == false -> use "next" marking information | |
| 2233 VerifyRootsClosure(bool use_prev_marking) : | |
| 2234 _g1h(G1CollectedHeap::heap()), _failures(false), | |
| 2235 _use_prev_marking(use_prev_marking) { } | |
| 342 | 2236 |
| 2237 bool failures() { return _failures; } | |
| 2238 | |
| 2239 void do_oop(narrowOop* p) { | |
| 2240 guarantee(false, "NYI"); | |
| 2241 } | |
| 2242 | |
| 2243 void do_oop(oop* p) { | |
| 2244 oop obj = *p; | |
| 2245 if (obj != NULL) { | |
| 811 | 2246 if (_g1h->is_obj_dead_cond(obj, _use_prev_marking)) { |
| 342 | 2247 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
| 2248 "points to dead obj "PTR_FORMAT, p, (void*) obj); | |
| 2249 obj->print_on(gclog_or_tty); | |
| 2250 _failures = true; | |
| 2251 } | |
| 2252 } | |
| 2253 } | |
| 2254 }; | |
| 2255 | |
| 390 | 2256 // This is the task used for parallel heap verification. |
| 2257 | |
| 2258 class G1ParVerifyTask: public AbstractGangTask { | |
| 2259 private: | |
| 2260 G1CollectedHeap* _g1h; | |
| 2261 bool _allow_dirty; | |
| 811 | 2262 bool _use_prev_marking; |
| 390 | 2263 |
| 2264 public: | |
| 811 | 2265 // use_prev_marking == true -> use "prev" marking information, |
| 2266 // use_prev_marking == false -> use "next" marking information | |
| 2267 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, | |
| 2268 bool use_prev_marking) : | |
| 390 | 2269 AbstractGangTask("Parallel verify task"), |
| 811 | 2270 _g1h(g1h), _allow_dirty(allow_dirty), |
| 2271 _use_prev_marking(use_prev_marking) { } | |
| 390 | 2272 |
| 2273 void work(int worker_i) { | |
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2274 HandleMark hm; |
| 811 | 2275 VerifyRegionClosure blk(_allow_dirty, true, _use_prev_marking); |
| 390 | 2276 _g1h->heap_region_par_iterate_chunked(&blk, worker_i, |
| 2277 HeapRegion::ParVerifyClaimValue); | |
| 2278 } | |
| 2279 }; | |
| 2280 | |
| 342 | 2281 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
| 811 | 2282 verify(allow_dirty, silent, /* use_prev_marking */ true); |
| 2283 } | |
| 2284 | |
| 2285 void G1CollectedHeap::verify(bool allow_dirty, | |
| 2286 bool silent, | |
| 2287 bool use_prev_marking) { | |
| 342 | 2288 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
| 2289 if (!silent) { gclog_or_tty->print("roots "); } | |
| 811 | 2290 VerifyRootsClosure rootsCl(use_prev_marking); |
| 342 | 2291 process_strong_roots(false, |
| 2292 SharedHeap::SO_AllClasses, | |
| 2293 &rootsCl, | |
| 2294 &rootsCl); | |
| 2295 rem_set()->invalidate(perm_gen()->used_region(), false); | |
| 2296 if (!silent) { gclog_or_tty->print("heapRegions "); } | |
| 390 | 2297 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
| 2298 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2299 "sanity check"); | |
| 2300 | |
| 811 | 2301 G1ParVerifyTask task(this, allow_dirty, use_prev_marking); |
| 390 | 2302 int n_workers = workers()->total_workers(); |
| 2303 set_par_threads(n_workers); | |
| 2304 workers()->run_task(&task); | |
| 2305 set_par_threads(0); | |
| 2306 | |
| 2307 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), | |
| 2308 "sanity check"); | |
| 2309 | |
| 2310 reset_heap_region_claim_values(); | |
| 2311 | |
| 2312 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2313 "sanity check"); | |
| 2314 } else { | |
| 811 | 2315 VerifyRegionClosure blk(allow_dirty, false, use_prev_marking); |
| 390 | 2316 _hrs->iterate(&blk); |
| 2317 } | |
| 342 | 2318 if (!silent) gclog_or_tty->print("remset "); |
| 2319 rem_set()->verify(); | |
| 2320 guarantee(!rootsCl.failures(), "should not have had failures"); | |
| 2321 } else { | |
| 2322 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
| 2323 } | |
| 2324 } | |
| 2325 | |
| 2326 class PrintRegionClosure: public HeapRegionClosure { | |
| 2327 outputStream* _st; | |
| 2328 public: | |
| 2329 PrintRegionClosure(outputStream* st) : _st(st) {} | |
| 2330 bool doHeapRegion(HeapRegion* r) { | |
| 2331 r->print_on(_st); | |
| 2332 return false; | |
| 2333 } | |
| 2334 }; | |
| 2335 | |
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2336 void G1CollectedHeap::print() const { print_on(tty); } |
| 342 | 2337 |
| 2338 void G1CollectedHeap::print_on(outputStream* st) const { | |
|
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2339 print_on(st, PrintHeapAtGCExtended); |
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2340 } |
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2341 |
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2342 void G1CollectedHeap::print_on(outputStream* st, bool extended) const { |
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2343 st->print(" %-20s", "garbage-first heap"); |
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2344 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
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2345 capacity()/K, used()/K); |
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2346 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
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2347 _g1_storage.low_boundary(), |
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2348 _g1_storage.high(), |
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2349 _g1_storage.high_boundary()); |
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2350 st->cr(); |
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2351 st->print(" region size " SIZE_FORMAT "K, ", |
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2352 HeapRegion::GrainBytes/K); |
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2353 size_t young_regions = _young_list->length(); |
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2354 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
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2355 young_regions, young_regions * HeapRegion::GrainBytes / K); |
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2356 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
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2357 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
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2358 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
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2359 st->cr(); |
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2360 perm()->as_gen()->print_on(st); |
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2361 if (extended) { |
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2362 print_on_extended(st); |
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2363 } |
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2364 } |
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2365 |
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2366 void G1CollectedHeap::print_on_extended(outputStream* st) const { |
| 342 | 2367 PrintRegionClosure blk(st); |
| 2368 _hrs->iterate(&blk); | |
| 2369 } | |
| 2370 | |
| 794 | 2371 class PrintOnThreadsClosure : public ThreadClosure { |
| 2372 outputStream* _st; | |
| 2373 public: | |
| 2374 PrintOnThreadsClosure(outputStream* st) : _st(st) { } | |
| 2375 virtual void do_thread(Thread *t) { | |
| 2376 t->print_on(_st); | |
| 2377 } | |
| 2378 }; | |
| 2379 | |
| 342 | 2380 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { |
| 2381 if (ParallelGCThreads > 0) { | |
| 2382 workers()->print_worker_threads(); | |
| 2383 } | |
| 2384 st->print("\"G1 concurrent mark GC Thread\" "); | |
| 2385 _cmThread->print(); | |
| 2386 st->cr(); | |
| 794 | 2387 st->print("\"G1 concurrent refinement GC Threads\" "); |
| 2388 PrintOnThreadsClosure p(st); | |
| 2389 _cg1r->threads_do(&p); | |
| 342 | 2390 st->cr(); |
| 2391 st->print("\"G1 zero-fill GC Thread\" "); | |
| 2392 _czft->print_on(st); | |
| 2393 st->cr(); | |
| 2394 } | |
| 2395 | |
| 2396 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
| 2397 if (ParallelGCThreads > 0) { | |
| 2398 workers()->threads_do(tc); | |
| 2399 } | |
| 2400 tc->do_thread(_cmThread); | |
| 794 | 2401 _cg1r->threads_do(tc); |
| 342 | 2402 tc->do_thread(_czft); |
| 2403 } | |
| 2404 | |
| 2405 void G1CollectedHeap::print_tracing_info() const { | |
| 2406 concurrent_g1_refine()->print_final_card_counts(); | |
| 2407 | |
| 2408 // We'll overload this to mean "trace GC pause statistics." | |
| 2409 if (TraceGen0Time || TraceGen1Time) { | |
| 2410 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
| 2411 // to that. | |
| 2412 g1_policy()->print_tracing_info(); | |
| 2413 } | |
| 751 | 2414 if (G1SummarizeRSetStats) { |
| 342 | 2415 g1_rem_set()->print_summary_info(); |
| 2416 } | |
| 751 | 2417 if (G1SummarizeConcurrentMark) { |
| 342 | 2418 concurrent_mark()->print_summary_info(); |
| 2419 } | |
| 751 | 2420 if (G1SummarizeZFStats) { |
| 342 | 2421 ConcurrentZFThread::print_summary_info(); |
| 2422 } | |
| 2423 g1_policy()->print_yg_surv_rate_info(); | |
| 2424 | |
| 2425 GCOverheadReporter::printGCOverhead(); | |
| 2426 | |
| 2427 SpecializationStats::print(); | |
| 2428 } | |
| 2429 | |
| 2430 | |
| 2431 int G1CollectedHeap::addr_to_arena_id(void* addr) const { | |
| 2432 HeapRegion* hr = heap_region_containing(addr); | |
| 2433 if (hr == NULL) { | |
| 2434 return 0; | |
| 2435 } else { | |
| 2436 return 1; | |
| 2437 } | |
| 2438 } | |
| 2439 | |
| 2440 G1CollectedHeap* G1CollectedHeap::heap() { | |
| 2441 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
| 2442 "not a garbage-first heap"); | |
| 2443 return _g1h; | |
| 2444 } | |
| 2445 | |
| 2446 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
| 2447 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); | |
| 2448 // Call allocation profiler | |
| 2449 AllocationProfiler::iterate_since_last_gc(); | |
| 2450 // Fill TLAB's and such | |
| 2451 ensure_parsability(true); | |
| 2452 } | |
| 2453 | |
| 2454 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
| 2455 // FIXME: what is this about? | |
| 2456 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
| 2457 // is set. | |
| 2458 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
| 2459 "derived pointer present")); | |
| 2460 } | |
| 2461 | |
| 2462 void G1CollectedHeap::do_collection_pause() { | |
| 2463 // Read the GC count while holding the Heap_lock | |
| 2464 // we need to do this _before_ wait_for_cleanup_complete(), to | |
| 2465 // ensure that we do not give up the heap lock and potentially | |
| 2466 // pick up the wrong count | |
| 2467 int gc_count_before = SharedHeap::heap()->total_collections(); | |
| 2468 | |
| 2469 // Don't want to do a GC pause while cleanup is being completed! | |
| 2470 wait_for_cleanup_complete(); | |
| 2471 | |
| 2472 g1_policy()->record_stop_world_start(); | |
| 2473 { | |
| 2474 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
| 2475 VM_G1IncCollectionPause op(gc_count_before); | |
| 2476 VMThread::execute(&op); | |
| 2477 } | |
| 2478 } | |
| 2479 | |
| 2480 void | |
| 2481 G1CollectedHeap::doConcurrentMark() { | |
| 2482 if (G1ConcMark) { | |
| 2483 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); | |
| 2484 if (!_cmThread->in_progress()) { | |
| 2485 _cmThread->set_started(); | |
| 2486 CGC_lock->notify(); | |
| 2487 } | |
| 2488 } | |
| 2489 } | |
| 2490 | |
| 2491 class VerifyMarkedObjsClosure: public ObjectClosure { | |
| 2492 G1CollectedHeap* _g1h; | |
| 2493 public: | |
| 2494 VerifyMarkedObjsClosure(G1CollectedHeap* g1h) : _g1h(g1h) {} | |
| 2495 void do_object(oop obj) { | |
| 2496 assert(obj->mark()->is_marked() ? !_g1h->is_obj_dead(obj) : true, | |
| 2497 "markandsweep mark should agree with concurrent deadness"); | |
| 2498 } | |
| 2499 }; | |
| 2500 | |
| 2501 void | |
| 2502 G1CollectedHeap::checkConcurrentMark() { | |
| 2503 VerifyMarkedObjsClosure verifycl(this); | |
| 2504 // MutexLockerEx x(getMarkBitMapLock(), | |
| 2505 // Mutex::_no_safepoint_check_flag); | |
| 678 | 2506 object_iterate(&verifycl, false); |
| 342 | 2507 } |
| 2508 | |
| 2509 void G1CollectedHeap::do_sync_mark() { | |
| 2510 _cm->checkpointRootsInitial(); | |
| 2511 _cm->markFromRoots(); | |
| 2512 _cm->checkpointRootsFinal(false); | |
| 2513 } | |
| 2514 | |
| 2515 // <NEW PREDICTION> | |
| 2516 | |
| 2517 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
| 2518 bool young) { | |
| 2519 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
| 2520 } | |
| 2521 | |
| 2522 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
| 2523 predicted_time_ms) { | |
| 2524 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
| 2525 } | |
| 2526 | |
| 2527 size_t G1CollectedHeap::pending_card_num() { | |
| 2528 size_t extra_cards = 0; | |
| 2529 JavaThread *curr = Threads::first(); | |
| 2530 while (curr != NULL) { | |
| 2531 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
| 2532 extra_cards += dcq.size(); | |
| 2533 curr = curr->next(); | |
| 2534 } | |
| 2535 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 2536 size_t buffer_size = dcqs.buffer_size(); | |
| 2537 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 2538 return buffer_size * buffer_num + extra_cards; | |
| 2539 } | |
| 2540 | |
| 2541 size_t G1CollectedHeap::max_pending_card_num() { | |
| 2542 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 2543 size_t buffer_size = dcqs.buffer_size(); | |
| 2544 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 2545 int thread_num = Threads::number_of_threads(); | |
| 2546 return (buffer_num + thread_num) * buffer_size; | |
| 2547 } | |
| 2548 | |
| 2549 size_t G1CollectedHeap::cards_scanned() { | |
| 2550 HRInto_G1RemSet* g1_rset = (HRInto_G1RemSet*) g1_rem_set(); | |
| 2551 return g1_rset->cardsScanned(); | |
| 2552 } | |
| 2553 | |
| 2554 void | |
| 2555 G1CollectedHeap::setup_surviving_young_words() { | |
| 2556 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
| 2557 size_t array_length = g1_policy()->young_cset_length(); | |
| 2558 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); | |
| 2559 if (_surviving_young_words == NULL) { | |
| 2560 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
| 2561 "Not enough space for young surv words summary."); | |
| 2562 } | |
| 2563 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
| 2564 for (size_t i = 0; i < array_length; ++i) { | |
| 2565 guarantee( _surviving_young_words[i] == 0, "invariant" ); | |
| 2566 } | |
| 2567 } | |
| 2568 | |
| 2569 void | |
| 2570 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
| 2571 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 2572 size_t array_length = g1_policy()->young_cset_length(); | |
| 2573 for (size_t i = 0; i < array_length; ++i) | |
| 2574 _surviving_young_words[i] += surv_young_words[i]; | |
| 2575 } | |
| 2576 | |
| 2577 void | |
| 2578 G1CollectedHeap::cleanup_surviving_young_words() { | |
| 2579 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
| 2580 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
| 2581 _surviving_young_words = NULL; | |
| 2582 } | |
| 2583 | |
| 2584 // </NEW PREDICTION> | |
| 2585 | |
| 2586 void | |
| 677 | 2587 G1CollectedHeap::do_collection_pause_at_safepoint() { |
|
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2588 if (PrintHeapAtGC) { |
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2589 Universe::print_heap_before_gc(); |
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2590 } |
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2591 |
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2592 { |
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2593 char verbose_str[128]; |
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2594 sprintf(verbose_str, "GC pause "); |
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2595 if (g1_policy()->in_young_gc_mode()) { |
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2596 if (g1_policy()->full_young_gcs()) |
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2597 strcat(verbose_str, "(young)"); |
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2598 else |
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2599 strcat(verbose_str, "(partial)"); |
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2600 } |
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2601 if (g1_policy()->should_initiate_conc_mark()) |
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2602 strcat(verbose_str, " (initial-mark)"); |
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2603 |
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2604 GCCauseSetter x(this, GCCause::_g1_inc_collection_pause); |
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2605 |
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2606 // if PrintGCDetails is on, we'll print long statistics information |
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2607 // in the collector policy code, so let's not print this as the output |
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2608 // is messy if we do. |
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2609 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
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2610 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
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2611 TraceTime t(verbose_str, PrintGC && !PrintGCDetails, true, gclog_or_tty); |
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2612 |
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2613 ResourceMark rm; |
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2614 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
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2615 assert(Thread::current() == VMThread::vm_thread(), "should be in vm thread"); |
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2616 guarantee(!is_gc_active(), "collection is not reentrant"); |
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2617 assert(regions_accounted_for(), "Region leakage!"); |
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2618 |
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2619 increment_gc_time_stamp(); |
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2620 |
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2621 if (g1_policy()->in_young_gc_mode()) { |
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2622 assert(check_young_list_well_formed(), |
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2623 "young list should be well formed"); |
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2624 } |
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2625 |
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2626 if (GC_locker::is_active()) { |
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2627 return; // GC is disabled (e.g. JNI GetXXXCritical operation) |
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2628 } |
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2629 |
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2630 bool abandoned = false; |
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2631 { // Call to jvmpi::post_class_unload_events must occur outside of active GC |
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2632 IsGCActiveMark x; |
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2633 |
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2634 gc_prologue(false); |
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2635 increment_total_collections(false /* full gc */); |
| 342 | 2636 |
| 2637 #if G1_REM_SET_LOGGING | |
|
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2638 gclog_or_tty->print_cr("\nJust chose CS, heap:"); |
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2639 print(); |
| 342 | 2640 #endif |
| 2641 | |
|
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2642 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
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2643 HandleMark hm; // Discard invalid handles created during verification |
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2644 prepare_for_verify(); |
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2645 gclog_or_tty->print(" VerifyBeforeGC:"); |
|
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2646 Universe::verify(false); |
|
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|
2647 } |
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2648 |
|
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|
2649 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
|
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2650 |
|
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|
2651 // We want to turn off ref discovery, if necessary, and turn it back on |
|
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2652 // on again later if we do. |
|
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|
2653 bool was_enabled = ref_processor()->discovery_enabled(); |
|
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|
2654 if (was_enabled) ref_processor()->disable_discovery(); |
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|
2655 |
|
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|
2656 // Forget the current alloc region (we might even choose it to be part |
|
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|
2657 // of the collection set!). |
|
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|
2658 abandon_cur_alloc_region(); |
|
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|
2659 |
|
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|
2660 // The elapsed time induced by the start time below deliberately elides |
|
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|
2661 // the possible verification above. |
|
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|
2662 double start_time_sec = os::elapsedTime(); |
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|
2663 GCOverheadReporter::recordSTWStart(start_time_sec); |
|
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|
2664 size_t start_used_bytes = used(); |
|
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|
2665 if (!G1ConcMark) { |
|
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|
2666 do_sync_mark(); |
|
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|
2667 } |
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2668 |
|
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|
2669 g1_policy()->record_collection_pause_start(start_time_sec, |
|
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|
2670 start_used_bytes); |
|
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|
2671 |
|
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|
2672 guarantee(_in_cset_fast_test == NULL, "invariant"); |
|
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|
2673 guarantee(_in_cset_fast_test_base == NULL, "invariant"); |
|
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|
2674 _in_cset_fast_test_length = max_regions(); |
|
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|
2675 _in_cset_fast_test_base = |
| 526 | 2676 NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); |
|
838
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|
2677 memset(_in_cset_fast_test_base, false, |
| 526 | 2678 _in_cset_fast_test_length * sizeof(bool)); |
|
838
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2679 // We're biasing _in_cset_fast_test to avoid subtracting the |
|
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|
2680 // beginning of the heap every time we want to index; basically |
|
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|
2681 // it's the same with what we do with the card table. |
|
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|
2682 _in_cset_fast_test = _in_cset_fast_test_base - |
| 526 | 2683 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
| 2684 | |
| 342 | 2685 #if SCAN_ONLY_VERBOSE |
|
838
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|
2686 _young_list->print(); |
| 342 | 2687 #endif // SCAN_ONLY_VERBOSE |
| 2688 | |
|
838
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|
2689 if (g1_policy()->should_initiate_conc_mark()) { |
|
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|
2690 concurrent_mark()->checkpointRootsInitialPre(); |
|
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|
2691 } |
|
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|
2692 save_marks(); |
|
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|
2693 |
|
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|
2694 // We must do this before any possible evacuation that should propagate |
|
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|
2695 // marks. |
|
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|
2696 if (mark_in_progress()) { |
|
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|
2697 double start_time_sec = os::elapsedTime(); |
|
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|
2698 |
|
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|
2699 _cm->drainAllSATBBuffers(); |
|
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|
2700 double finish_mark_ms = (os::elapsedTime() - start_time_sec) * 1000.0; |
|
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|
2701 g1_policy()->record_satb_drain_time(finish_mark_ms); |
|
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|
2702 } |
|
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|
2703 // Record the number of elements currently on the mark stack, so we |
|
0316eac49d5a
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|
2704 // only iterate over these. (Since evacuation may add to the mark |
|
0316eac49d5a
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|
2705 // stack, doing more exposes race conditions.) If no mark is in |
|
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|
2706 // progress, this will be zero. |
|
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|
2707 _cm->set_oops_do_bound(); |
|
0316eac49d5a
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|
2708 |
|
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|
2709 assert(regions_accounted_for(), "Region leakage."); |
|
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|
2710 |
|
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|
2711 if (mark_in_progress()) |
|
0316eac49d5a
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|
2712 concurrent_mark()->newCSet(); |
|
0316eac49d5a
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|
2713 |
|
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|
2714 // Now choose the CS. |
|
0316eac49d5a
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|
2715 g1_policy()->choose_collection_set(); |
|
0316eac49d5a
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|
2716 |
|
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|
2717 // We may abandon a pause if we find no region that will fit in the MMU |
|
0316eac49d5a
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|
2718 // pause. |
|
0316eac49d5a
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|
2719 bool abandoned = (g1_policy()->collection_set() == NULL); |
|
0316eac49d5a
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|
2720 |
|
0316eac49d5a
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|
2721 // Nothing to do if we were unable to choose a collection set. |
|
0316eac49d5a
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|
2722 if (!abandoned) { |
| 342 | 2723 #if G1_REM_SET_LOGGING |
|
838
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|
2724 gclog_or_tty->print_cr("\nAfter pause, heap:"); |
|
0316eac49d5a
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|
2725 print(); |
| 342 | 2726 #endif |
| 2727 | |
|
838
0316eac49d5a
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|
2728 setup_surviving_young_words(); |
|
0316eac49d5a
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|
2729 |
|
0316eac49d5a
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|
2730 // Set up the gc allocation regions. |
|
0316eac49d5a
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|
2731 get_gc_alloc_regions(); |
|
0316eac49d5a
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|
2732 |
|
0316eac49d5a
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|
2733 // Actually do the work... |
|
0316eac49d5a
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|
2734 evacuate_collection_set(); |
|
0316eac49d5a
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|
2735 free_collection_set(g1_policy()->collection_set()); |
|
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|
2736 g1_policy()->clear_collection_set(); |
|
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|
2737 |
|
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|
2738 FREE_C_HEAP_ARRAY(bool, _in_cset_fast_test_base); |
|
0316eac49d5a
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|
2739 // this is more for peace of mind; we're nulling them here and |
|
0316eac49d5a
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|
2740 // we're expecting them to be null at the beginning of the next GC |
|
0316eac49d5a
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|
2741 _in_cset_fast_test = NULL; |
|
0316eac49d5a
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|
2742 _in_cset_fast_test_base = NULL; |
|
0316eac49d5a
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|
2743 |
|
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|
2744 release_gc_alloc_regions(false /* totally */); |
|
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|
2745 |
|
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|
2746 cleanup_surviving_young_words(); |
|
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|
2747 |
|
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|
2748 if (g1_policy()->in_young_gc_mode()) { |
|
0316eac49d5a
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|
2749 _young_list->reset_sampled_info(); |
|
0316eac49d5a
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|
2750 assert(check_young_list_empty(true), |
|
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|
2751 "young list should be empty"); |
| 342 | 2752 |
| 2753 #if SCAN_ONLY_VERBOSE | |
|
838
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|
2754 _young_list->print(); |
| 342 | 2755 #endif // SCAN_ONLY_VERBOSE |
| 2756 | |
|
838
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|
2757 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
|
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|
2758 _young_list->first_survivor_region(), |
|
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|
2759 _young_list->last_survivor_region()); |
|
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|
2760 _young_list->reset_auxilary_lists(); |
|
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|
2761 } |
|
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|
2762 } else { |
|
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|
2763 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
| 342 | 2764 } |
|
838
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|
2765 |
|
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|
2766 if (evacuation_failed()) { |
|
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|
2767 _summary_bytes_used = recalculate_used(); |
|
0316eac49d5a
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|
2768 } else { |
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2769 // The "used" of the the collection set have already been subtracted |
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2770 // when they were freed. Add in the bytes evacuated. |
|
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2771 _summary_bytes_used += g1_policy()->bytes_in_to_space(); |
|
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2772 } |
|
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2773 |
|
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2774 if (g1_policy()->in_young_gc_mode() && |
|
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2775 g1_policy()->should_initiate_conc_mark()) { |
|
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2776 concurrent_mark()->checkpointRootsInitialPost(); |
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2777 set_marking_started(); |
|
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2778 doConcurrentMark(); |
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2779 } |
| 342 | 2780 |
| 2781 #if SCAN_ONLY_VERBOSE | |
|
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2782 _young_list->print(); |
| 342 | 2783 #endif // SCAN_ONLY_VERBOSE |
| 2784 | |
|
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2785 double end_time_sec = os::elapsedTime(); |
|
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2786 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
|
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2787 g1_policy()->record_pause_time_ms(pause_time_ms); |
|
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2788 GCOverheadReporter::recordSTWEnd(end_time_sec); |
|
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2789 g1_policy()->record_collection_pause_end(abandoned); |
|
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2790 |
|
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2791 assert(regions_accounted_for(), "Region leakage."); |
|
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2792 |
|
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2793 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
|
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2794 HandleMark hm; // Discard invalid handles created during verification |
|
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2795 gclog_or_tty->print(" VerifyAfterGC:"); |
|
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2796 prepare_for_verify(); |
|
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2797 Universe::verify(false); |
| 342 | 2798 } |
|
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2799 |
|
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2800 if (was_enabled) ref_processor()->enable_discovery(); |
|
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2801 |
|
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2802 { |
|
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2803 size_t expand_bytes = g1_policy()->expansion_amount(); |
|
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2804 if (expand_bytes > 0) { |
|
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2805 size_t bytes_before = capacity(); |
|
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2806 expand(expand_bytes); |
|
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2807 } |
|
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2808 } |
|
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2809 |
|
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2810 if (mark_in_progress()) { |
|
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2811 concurrent_mark()->update_g1_committed(); |
|
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|
2812 } |
|
546
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6690928: Use spinning in combination with yields for workstealing termination.
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|
2813 |
|
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2814 #ifdef TRACESPINNING |
|
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2815 ParallelTaskTerminator::print_termination_counts(); |
|
546
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2816 #endif |
| 342 | 2817 |
|
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2818 gc_epilogue(false); |
|
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2819 } |
|
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2820 |
|
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2821 assert(verify_region_lists(), "Bad region lists."); |
|
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2822 |
|
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2823 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
|
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2824 gclog_or_tty->print_cr("Stopping after GC #%d", ExitAfterGCNum); |
|
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2825 print_tracing_info(); |
|
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2826 vm_exit(-1); |
|
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|
2827 } |
|
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2828 } |
|
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2829 |
|
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2830 if (PrintHeapAtGC) { |
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2831 Universe::print_heap_after_gc(); |
| 342 | 2832 } |
| 2833 } | |
| 2834 | |
| 2835 void G1CollectedHeap::set_gc_alloc_region(int purpose, HeapRegion* r) { | |
| 2836 assert(purpose >= 0 && purpose < GCAllocPurposeCount, "invalid purpose"); | |
| 636 | 2837 // make sure we don't call set_gc_alloc_region() multiple times on |
| 2838 // the same region | |
| 2839 assert(r == NULL || !r->is_gc_alloc_region(), | |
| 2840 "shouldn't already be a GC alloc region"); | |
| 342 | 2841 HeapWord* original_top = NULL; |
| 2842 if (r != NULL) | |
| 2843 original_top = r->top(); | |
| 2844 | |
| 2845 // We will want to record the used space in r as being there before gc. | |
| 2846 // One we install it as a GC alloc region it's eligible for allocation. | |
| 2847 // So record it now and use it later. | |
| 2848 size_t r_used = 0; | |
| 2849 if (r != NULL) { | |
| 2850 r_used = r->used(); | |
| 2851 | |
| 2852 if (ParallelGCThreads > 0) { | |
| 2853 // need to take the lock to guard against two threads calling | |
| 2854 // get_gc_alloc_region concurrently (very unlikely but...) | |
| 2855 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 2856 r->save_marks(); | |
| 2857 } | |
| 2858 } | |
| 2859 HeapRegion* old_alloc_region = _gc_alloc_regions[purpose]; | |
| 2860 _gc_alloc_regions[purpose] = r; | |
| 2861 if (old_alloc_region != NULL) { | |
| 2862 // Replace aliases too. | |
| 2863 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 2864 if (_gc_alloc_regions[ap] == old_alloc_region) { | |
| 2865 _gc_alloc_regions[ap] = r; | |
| 2866 } | |
| 2867 } | |
| 2868 } | |
| 2869 if (r != NULL) { | |
| 2870 push_gc_alloc_region(r); | |
| 2871 if (mark_in_progress() && original_top != r->next_top_at_mark_start()) { | |
| 2872 // We are using a region as a GC alloc region after it has been used | |
| 2873 // as a mutator allocation region during the current marking cycle. | |
| 2874 // The mutator-allocated objects are currently implicitly marked, but | |
| 2875 // when we move hr->next_top_at_mark_start() forward at the the end | |
| 2876 // of the GC pause, they won't be. We therefore mark all objects in | |
| 2877 // the "gap". We do this object-by-object, since marking densely | |
| 2878 // does not currently work right with marking bitmap iteration. This | |
| 2879 // means we rely on TLAB filling at the start of pauses, and no | |
| 2880 // "resuscitation" of filled TLAB's. If we want to do this, we need | |
| 2881 // to fix the marking bitmap iteration. | |
| 2882 HeapWord* curhw = r->next_top_at_mark_start(); | |
| 2883 HeapWord* t = original_top; | |
| 2884 | |
| 2885 while (curhw < t) { | |
| 2886 oop cur = (oop)curhw; | |
| 2887 // We'll assume parallel for generality. This is rare code. | |
| 2888 concurrent_mark()->markAndGrayObjectIfNecessary(cur); // can't we just mark them? | |
| 2889 curhw = curhw + cur->size(); | |
| 2890 } | |
| 2891 assert(curhw == t, "Should have parsed correctly."); | |
| 2892 } | |
| 2893 if (G1PolicyVerbose > 1) { | |
| 2894 gclog_or_tty->print("New alloc region ["PTR_FORMAT", "PTR_FORMAT", " PTR_FORMAT") " | |
| 2895 "for survivors:", r->bottom(), original_top, r->end()); | |
| 2896 r->print(); | |
| 2897 } | |
| 2898 g1_policy()->record_before_bytes(r_used); | |
| 2899 } | |
| 2900 } | |
| 2901 | |
| 2902 void G1CollectedHeap::push_gc_alloc_region(HeapRegion* hr) { | |
| 2903 assert(Thread::current()->is_VM_thread() || | |
| 2904 par_alloc_during_gc_lock()->owned_by_self(), "Precondition"); | |
| 2905 assert(!hr->is_gc_alloc_region() && !hr->in_collection_set(), | |
| 2906 "Precondition."); | |
| 2907 hr->set_is_gc_alloc_region(true); | |
| 2908 hr->set_next_gc_alloc_region(_gc_alloc_region_list); | |
| 2909 _gc_alloc_region_list = hr; | |
| 2910 } | |
| 2911 | |
| 2912 #ifdef G1_DEBUG | |
| 2913 class FindGCAllocRegion: public HeapRegionClosure { | |
| 2914 public: | |
| 2915 bool doHeapRegion(HeapRegion* r) { | |
| 2916 if (r->is_gc_alloc_region()) { | |
| 2917 gclog_or_tty->print_cr("Region %d ["PTR_FORMAT"...] is still a gc_alloc_region.", | |
| 2918 r->hrs_index(), r->bottom()); | |
| 2919 } | |
| 2920 return false; | |
| 2921 } | |
| 2922 }; | |
| 2923 #endif // G1_DEBUG | |
| 2924 | |
| 2925 void G1CollectedHeap::forget_alloc_region_list() { | |
| 2926 assert(Thread::current()->is_VM_thread(), "Precondition"); | |
| 2927 while (_gc_alloc_region_list != NULL) { | |
| 2928 HeapRegion* r = _gc_alloc_region_list; | |
| 2929 assert(r->is_gc_alloc_region(), "Invariant."); | |
|
637
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|
2930 // We need HeapRegion::oops_on_card_seq_iterate_careful() to work on |
|
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|
2931 // newly allocated data in order to be able to apply deferred updates |
|
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|
2932 // before the GC is done for verification purposes (i.e to allow |
|
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|
2933 // G1HRRSFlushLogBuffersOnVerify). It's safe thing to do after the |
|
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|
2934 // collection. |
|
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|
2935 r->ContiguousSpace::set_saved_mark(); |
| 342 | 2936 _gc_alloc_region_list = r->next_gc_alloc_region(); |
| 2937 r->set_next_gc_alloc_region(NULL); | |
| 2938 r->set_is_gc_alloc_region(false); | |
| 545 | 2939 if (r->is_survivor()) { |
| 2940 if (r->is_empty()) { | |
| 2941 r->set_not_young(); | |
| 2942 } else { | |
| 2943 _young_list->add_survivor_region(r); | |
| 2944 } | |
| 2945 } | |
| 342 | 2946 if (r->is_empty()) { |
| 2947 ++_free_regions; | |
| 2948 } | |
| 2949 } | |
| 2950 #ifdef G1_DEBUG | |
| 2951 FindGCAllocRegion fa; | |
| 2952 heap_region_iterate(&fa); | |
| 2953 #endif // G1_DEBUG | |
| 2954 } | |
| 2955 | |
| 2956 | |
| 2957 bool G1CollectedHeap::check_gc_alloc_regions() { | |
| 2958 // TODO: allocation regions check | |
| 2959 return true; | |
| 2960 } | |
| 2961 | |
| 2962 void G1CollectedHeap::get_gc_alloc_regions() { | |
| 636 | 2963 // First, let's check that the GC alloc region list is empty (it should) |
| 2964 assert(_gc_alloc_region_list == NULL, "invariant"); | |
| 2965 | |
| 342 | 2966 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
| 636 | 2967 assert(_gc_alloc_regions[ap] == NULL, "invariant"); |
| 2968 | |
| 342 | 2969 // Create new GC alloc regions. |
| 636 | 2970 HeapRegion* alloc_region = _retained_gc_alloc_regions[ap]; |
| 2971 _retained_gc_alloc_regions[ap] = NULL; | |
| 2972 | |
| 2973 if (alloc_region != NULL) { | |
| 2974 assert(_retain_gc_alloc_region[ap], "only way to retain a GC region"); | |
| 2975 | |
| 2976 // let's make sure that the GC alloc region is not tagged as such | |
| 2977 // outside a GC operation | |
| 2978 assert(!alloc_region->is_gc_alloc_region(), "sanity"); | |
| 2979 | |
| 2980 if (alloc_region->in_collection_set() || | |
| 2981 alloc_region->top() == alloc_region->end() || | |
| 2982 alloc_region->top() == alloc_region->bottom()) { | |
| 2983 // we will discard the current GC alloc region if it's in the | |
| 2984 // collection set (it can happen!), if it's already full (no | |
| 2985 // point in using it), or if it's empty (this means that it | |
| 2986 // was emptied during a cleanup and it should be on the free | |
| 2987 // list now). | |
| 2988 | |
| 2989 alloc_region = NULL; | |
| 2990 } | |
| 2991 } | |
| 2992 | |
| 2993 if (alloc_region == NULL) { | |
| 2994 // we will get a new GC alloc region | |
| 342 | 2995 alloc_region = newAllocRegionWithExpansion(ap, 0); |
| 2996 } | |
| 636 | 2997 |
| 342 | 2998 if (alloc_region != NULL) { |
| 636 | 2999 assert(_gc_alloc_regions[ap] == NULL, "pre-condition"); |
| 342 | 3000 set_gc_alloc_region(ap, alloc_region); |
| 3001 } | |
| 636 | 3002 |
| 3003 assert(_gc_alloc_regions[ap] == NULL || | |
| 3004 _gc_alloc_regions[ap]->is_gc_alloc_region(), | |
| 3005 "the GC alloc region should be tagged as such"); | |
| 3006 assert(_gc_alloc_regions[ap] == NULL || | |
| 3007 _gc_alloc_regions[ap] == _gc_alloc_region_list, | |
| 3008 "the GC alloc region should be the same as the GC alloc list head"); | |
| 342 | 3009 } |
| 3010 // Set alternative regions for allocation purposes that have reached | |
| 636 | 3011 // their limit. |
| 342 | 3012 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
| 3013 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(ap); | |
| 3014 if (_gc_alloc_regions[ap] == NULL && alt_purpose != ap) { | |
| 3015 _gc_alloc_regions[ap] = _gc_alloc_regions[alt_purpose]; | |
| 3016 } | |
| 3017 } | |
| 3018 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
| 3019 } | |
| 3020 | |
| 636 | 3021 void G1CollectedHeap::release_gc_alloc_regions(bool totally) { |
| 342 | 3022 // We keep a separate list of all regions that have been alloc regions in |
| 636 | 3023 // the current collection pause. Forget that now. This method will |
| 3024 // untag the GC alloc regions and tear down the GC alloc region | |
| 3025 // list. It's desirable that no regions are tagged as GC alloc | |
| 3026 // outside GCs. | |
| 342 | 3027 forget_alloc_region_list(); |
| 3028 | |
| 3029 // The current alloc regions contain objs that have survived | |
| 3030 // collection. Make them no longer GC alloc regions. | |
| 3031 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 3032 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 636 | 3033 _retained_gc_alloc_regions[ap] = NULL; |
| 3034 | |
| 3035 if (r != NULL) { | |
| 3036 // we retain nothing on _gc_alloc_regions between GCs | |
| 3037 set_gc_alloc_region(ap, NULL); | |
| 3038 _gc_alloc_region_counts[ap] = 0; | |
| 3039 | |
| 3040 if (r->is_empty()) { | |
| 3041 // we didn't actually allocate anything in it; let's just put | |
| 3042 // it on the free list | |
| 342 | 3043 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); |
| 3044 r->set_zero_fill_complete(); | |
| 3045 put_free_region_on_list_locked(r); | |
| 636 | 3046 } else if (_retain_gc_alloc_region[ap] && !totally) { |
| 3047 // retain it so that we can use it at the beginning of the next GC | |
| 3048 _retained_gc_alloc_regions[ap] = r; | |
| 342 | 3049 } |
| 3050 } | |
| 636 | 3051 } |
| 3052 } | |
| 3053 | |
| 3054 #ifndef PRODUCT | |
| 3055 // Useful for debugging | |
| 3056 | |
| 3057 void G1CollectedHeap::print_gc_alloc_regions() { | |
| 3058 gclog_or_tty->print_cr("GC alloc regions"); | |
| 3059 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 3060 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 3061 if (r == NULL) { | |
| 3062 gclog_or_tty->print_cr(" %2d : "PTR_FORMAT, ap, NULL); | |
| 3063 } else { | |
| 3064 gclog_or_tty->print_cr(" %2d : "PTR_FORMAT" "SIZE_FORMAT, | |
| 3065 ap, r->bottom(), r->used()); | |
| 3066 } | |
| 3067 } | |
| 3068 } | |
| 3069 #endif // PRODUCT | |
| 342 | 3070 |
| 3071 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
| 3072 _drain_in_progress = false; | |
| 3073 set_evac_failure_closure(cl); | |
| 3074 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 3075 } | |
| 3076 | |
| 3077 void G1CollectedHeap::finalize_for_evac_failure() { | |
| 3078 assert(_evac_failure_scan_stack != NULL && | |
| 3079 _evac_failure_scan_stack->length() == 0, | |
| 3080 "Postcondition"); | |
| 3081 assert(!_drain_in_progress, "Postcondition"); | |
| 3082 // Don't have to delete, since the scan stack is a resource object. | |
| 3083 _evac_failure_scan_stack = NULL; | |
| 3084 } | |
| 3085 | |
| 3086 | |
| 3087 | |
| 3088 // *** Sequential G1 Evacuation | |
| 3089 | |
| 3090 HeapWord* G1CollectedHeap::allocate_during_gc(GCAllocPurpose purpose, size_t word_size) { | |
| 3091 HeapRegion* alloc_region = _gc_alloc_regions[purpose]; | |
| 3092 // let the caller handle alloc failure | |
| 3093 if (alloc_region == NULL) return NULL; | |
| 3094 assert(isHumongous(word_size) || !alloc_region->isHumongous(), | |
| 3095 "Either the object is humongous or the region isn't"); | |
| 3096 HeapWord* block = alloc_region->allocate(word_size); | |
| 3097 if (block == NULL) { | |
| 3098 block = allocate_during_gc_slow(purpose, alloc_region, false, word_size); | |
| 3099 } | |
| 3100 return block; | |
| 3101 } | |
| 3102 | |
| 3103 class G1IsAliveClosure: public BoolObjectClosure { | |
| 3104 G1CollectedHeap* _g1; | |
| 3105 public: | |
| 3106 G1IsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
| 3107 void do_object(oop p) { assert(false, "Do not call."); } | |
| 3108 bool do_object_b(oop p) { | |
| 3109 // It is reachable if it is outside the collection set, or is inside | |
| 3110 // and forwarded. | |
| 3111 | |
| 3112 #ifdef G1_DEBUG | |
| 3113 gclog_or_tty->print_cr("is alive "PTR_FORMAT" in CS %d forwarded %d overall %d", | |
| 3114 (void*) p, _g1->obj_in_cs(p), p->is_forwarded(), | |
| 3115 !_g1->obj_in_cs(p) || p->is_forwarded()); | |
| 3116 #endif // G1_DEBUG | |
| 3117 | |
| 3118 return !_g1->obj_in_cs(p) || p->is_forwarded(); | |
| 3119 } | |
| 3120 }; | |
| 3121 | |
| 3122 class G1KeepAliveClosure: public OopClosure { | |
| 3123 G1CollectedHeap* _g1; | |
| 3124 public: | |
| 3125 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
| 3126 void do_oop(narrowOop* p) { | |
| 3127 guarantee(false, "NYI"); | |
| 3128 } | |
| 3129 void do_oop(oop* p) { | |
| 3130 oop obj = *p; | |
| 3131 #ifdef G1_DEBUG | |
| 3132 if (PrintGC && Verbose) { | |
| 3133 gclog_or_tty->print_cr("keep alive *"PTR_FORMAT" = "PTR_FORMAT" "PTR_FORMAT, | |
| 3134 p, (void*) obj, (void*) *p); | |
| 3135 } | |
| 3136 #endif // G1_DEBUG | |
| 3137 | |
| 3138 if (_g1->obj_in_cs(obj)) { | |
| 3139 assert( obj->is_forwarded(), "invariant" ); | |
| 3140 *p = obj->forwardee(); | |
| 3141 | |
| 3142 #ifdef G1_DEBUG | |
| 3143 gclog_or_tty->print_cr(" in CSet: moved "PTR_FORMAT" -> "PTR_FORMAT, | |
| 3144 (void*) obj, (void*) *p); | |
| 3145 #endif // G1_DEBUG | |
| 3146 } | |
| 3147 } | |
| 3148 }; | |
| 3149 | |
|
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3150 class UpdateRSetImmediate : public OopsInHeapRegionClosure { |
| 342 | 3151 private: |
| 3152 G1CollectedHeap* _g1; | |
| 3153 G1RemSet* _g1_rem_set; | |
| 3154 public: | |
|
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3155 UpdateRSetImmediate(G1CollectedHeap* g1) : |
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3156 _g1(g1), _g1_rem_set(g1->g1_rem_set()) {} |
| 342 | 3157 |
| 3158 void do_oop(narrowOop* p) { | |
| 3159 guarantee(false, "NYI"); | |
| 3160 } | |
| 3161 void do_oop(oop* p) { | |
| 3162 assert(_from->is_in_reserved(p), "paranoia"); | |
|
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3163 if (*p != NULL && !_from->is_survivor()) { |
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3164 _g1_rem_set->par_write_ref(_from, p, 0); |
| 342 | 3165 } |
| 3166 } | |
| 3167 }; | |
| 3168 | |
|
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3169 class UpdateRSetDeferred : public OopsInHeapRegionClosure { |
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3170 private: |
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3171 G1CollectedHeap* _g1; |
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3172 DirtyCardQueue *_dcq; |
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3173 CardTableModRefBS* _ct_bs; |
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3174 |
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3175 public: |
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3176 UpdateRSetDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
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3177 _g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) {} |
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3178 |
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3179 void do_oop(narrowOop* p) { |
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3180 guarantee(false, "NYI"); |
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3181 } |
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3182 void do_oop(oop* p) { |
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3183 assert(_from->is_in_reserved(p), "paranoia"); |
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3184 if (!_from->is_in_reserved(*p) && !_from->is_survivor()) { |
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3185 size_t card_index = _ct_bs->index_for(p); |
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3186 if (_ct_bs->mark_card_deferred(card_index)) { |
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3187 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
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3188 } |
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3189 } |
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3190 } |
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3191 }; |
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3192 |
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3193 |
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3194 |
| 342 | 3195 class RemoveSelfPointerClosure: public ObjectClosure { |
| 3196 private: | |
| 3197 G1CollectedHeap* _g1; | |
| 3198 ConcurrentMark* _cm; | |
| 3199 HeapRegion* _hr; | |
| 3200 size_t _prev_marked_bytes; | |
| 3201 size_t _next_marked_bytes; | |
|
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3202 OopsInHeapRegionClosure *_cl; |
| 342 | 3203 public: |
|
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3204 RemoveSelfPointerClosure(G1CollectedHeap* g1, OopsInHeapRegionClosure* cl) : |
|
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3205 _g1(g1), _cm(_g1->concurrent_mark()), _prev_marked_bytes(0), |
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3206 _next_marked_bytes(0), _cl(cl) {} |
| 342 | 3207 |
| 3208 size_t prev_marked_bytes() { return _prev_marked_bytes; } | |
| 3209 size_t next_marked_bytes() { return _next_marked_bytes; } | |
| 3210 | |
|
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3211 // The original idea here was to coalesce evacuated and dead objects. |
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3212 // However that caused complications with the block offset table (BOT). |
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3213 // In particular if there were two TLABs, one of them partially refined. |
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3214 // |----- TLAB_1--------|----TLAB_2-~~~(partially refined part)~~~| |
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3215 // The BOT entries of the unrefined part of TLAB_2 point to the start |
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3216 // of TLAB_2. If the last object of the TLAB_1 and the first object |
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3217 // of TLAB_2 are coalesced, then the cards of the unrefined part |
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3218 // would point into middle of the filler object. |
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3219 // |
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3220 // The current approach is to not coalesce and leave the BOT contents intact. |
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3221 void do_object(oop obj) { |
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3222 if (obj->is_forwarded() && obj->forwardee() == obj) { |
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3223 // The object failed to move. |
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3224 assert(!_g1->is_obj_dead(obj), "We should not be preserving dead objs."); |
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3225 _cm->markPrev(obj); |
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3226 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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3227 _prev_marked_bytes += (obj->size() * HeapWordSize); |
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3228 if (_g1->mark_in_progress() && !_g1->is_obj_ill(obj)) { |
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3229 _cm->markAndGrayObjectIfNecessary(obj); |
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3230 } |
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3231 obj->set_mark(markOopDesc::prototype()); |
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3232 // While we were processing RSet buffers during the |
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3233 // collection, we actually didn't scan any cards on the |
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3234 // collection set, since we didn't want to update remebered |
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3235 // sets with entries that point into the collection set, given |
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3236 // that live objects fromthe collection set are about to move |
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3237 // and such entries will be stale very soon. This change also |
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3238 // dealt with a reliability issue which involved scanning a |
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3239 // card in the collection set and coming across an array that |
|
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3240 // was being chunked and looking malformed. The problem is |
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3241 // that, if evacuation fails, we might have remembered set |
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3242 // entries missing given that we skipped cards on the |
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3243 // collection set. So, we'll recreate such entries now. |
|
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3244 obj->oop_iterate(_cl); |
|
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3245 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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3246 } else { |
|
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3247 // The object has been either evacuated or is dead. Fill it with a |
|
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3248 // dummy object. |
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3249 MemRegion mr((HeapWord*)obj, obj->size()); |
|
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3250 CollectedHeap::fill_with_object(mr); |
| 342 | 3251 _cm->clearRangeBothMaps(mr); |
| 3252 } | |
| 3253 } | |
| 3254 }; | |
| 3255 | |
| 3256 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
|
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3257 UpdateRSetImmediate immediate_update(_g1h); |
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3258 DirtyCardQueue dcq(&_g1h->dirty_card_queue_set()); |
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3259 UpdateRSetDeferred deferred_update(_g1h, &dcq); |
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3260 OopsInHeapRegionClosure *cl; |
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3261 if (G1DeferredRSUpdate) { |
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3262 cl = &deferred_update; |
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3263 } else { |
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3264 cl = &immediate_update; |
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3265 } |
| 342 | 3266 HeapRegion* cur = g1_policy()->collection_set(); |
| 3267 while (cur != NULL) { | |
| 3268 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
| 3269 | |
|
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3270 RemoveSelfPointerClosure rspc(_g1h, cl); |
| 342 | 3271 if (cur->evacuation_failed()) { |
| 3272 assert(cur->in_collection_set(), "bad CS"); | |
|
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3273 cl->set_region(cur); |
| 342 | 3274 cur->object_iterate(&rspc); |
| 3275 | |
| 3276 // A number of manipulations to make the TAMS be the current top, | |
| 3277 // and the marked bytes be the ones observed in the iteration. | |
| 3278 if (_g1h->concurrent_mark()->at_least_one_mark_complete()) { | |
| 3279 // The comments below are the postconditions achieved by the | |
| 3280 // calls. Note especially the last such condition, which says that | |
| 3281 // the count of marked bytes has been properly restored. | |
| 3282 cur->note_start_of_marking(false); | |
| 3283 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
| 3284 cur->add_to_marked_bytes(rspc.prev_marked_bytes()); | |
| 3285 // _next_marked_bytes == prev_marked_bytes. | |
| 3286 cur->note_end_of_marking(); | |
| 3287 // _prev_top_at_mark_start == top(), | |
| 3288 // _prev_marked_bytes == prev_marked_bytes | |
| 3289 } | |
| 3290 // If there is no mark in progress, we modified the _next variables | |
| 3291 // above needlessly, but harmlessly. | |
| 3292 if (_g1h->mark_in_progress()) { | |
| 3293 cur->note_start_of_marking(false); | |
| 3294 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
| 3295 // _next_marked_bytes == next_marked_bytes. | |
| 3296 } | |
| 3297 | |
| 3298 // Now make sure the region has the right index in the sorted array. | |
| 3299 g1_policy()->note_change_in_marked_bytes(cur); | |
| 3300 } | |
| 3301 cur = cur->next_in_collection_set(); | |
| 3302 } | |
| 3303 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
| 3304 | |
| 3305 // Now restore saved marks, if any. | |
| 3306 if (_objs_with_preserved_marks != NULL) { | |
| 3307 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
| 3308 assert(_objs_with_preserved_marks->length() == | |
| 3309 _preserved_marks_of_objs->length(), "Both or none."); | |
| 3310 guarantee(_objs_with_preserved_marks->length() == | |
| 3311 _preserved_marks_of_objs->length(), "Both or none."); | |
| 3312 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
| 3313 oop obj = _objs_with_preserved_marks->at(i); | |
| 3314 markOop m = _preserved_marks_of_objs->at(i); | |
| 3315 obj->set_mark(m); | |
| 3316 } | |
| 3317 // Delete the preserved marks growable arrays (allocated on the C heap). | |
| 3318 delete _objs_with_preserved_marks; | |
| 3319 delete _preserved_marks_of_objs; | |
| 3320 _objs_with_preserved_marks = NULL; | |
| 3321 _preserved_marks_of_objs = NULL; | |
| 3322 } | |
| 3323 } | |
| 3324 | |
| 3325 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
| 3326 _evac_failure_scan_stack->push(obj); | |
| 3327 } | |
| 3328 | |
| 3329 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
| 3330 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
| 3331 | |
| 3332 while (_evac_failure_scan_stack->length() > 0) { | |
| 3333 oop obj = _evac_failure_scan_stack->pop(); | |
| 3334 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
| 3335 obj->oop_iterate_backwards(_evac_failure_closure); | |
| 3336 } | |
| 3337 } | |
| 3338 | |
| 3339 void G1CollectedHeap::handle_evacuation_failure(oop old) { | |
| 3340 markOop m = old->mark(); | |
| 3341 // forward to self | |
| 3342 assert(!old->is_forwarded(), "precondition"); | |
| 3343 | |
| 3344 old->forward_to(old); | |
| 3345 handle_evacuation_failure_common(old, m); | |
| 3346 } | |
| 3347 | |
| 3348 oop | |
| 3349 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
| 3350 oop old) { | |
| 3351 markOop m = old->mark(); | |
| 3352 oop forward_ptr = old->forward_to_atomic(old); | |
| 3353 if (forward_ptr == NULL) { | |
| 3354 // Forward-to-self succeeded. | |
| 3355 if (_evac_failure_closure != cl) { | |
| 3356 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
| 3357 assert(!_drain_in_progress, | |
| 3358 "Should only be true while someone holds the lock."); | |
| 3359 // Set the global evac-failure closure to the current thread's. | |
| 3360 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
| 3361 set_evac_failure_closure(cl); | |
| 3362 // Now do the common part. | |
| 3363 handle_evacuation_failure_common(old, m); | |
| 3364 // Reset to NULL. | |
| 3365 set_evac_failure_closure(NULL); | |
| 3366 } else { | |
| 3367 // The lock is already held, and this is recursive. | |
| 3368 assert(_drain_in_progress, "This should only be the recursive case."); | |
| 3369 handle_evacuation_failure_common(old, m); | |
| 3370 } | |
| 3371 return old; | |
| 3372 } else { | |
| 3373 // Someone else had a place to copy it. | |
| 3374 return forward_ptr; | |
| 3375 } | |
| 3376 } | |
| 3377 | |
| 3378 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
| 3379 set_evacuation_failed(true); | |
| 3380 | |
| 3381 preserve_mark_if_necessary(old, m); | |
| 3382 | |
| 3383 HeapRegion* r = heap_region_containing(old); | |
| 3384 if (!r->evacuation_failed()) { | |
| 3385 r->set_evacuation_failed(true); | |
| 751 | 3386 if (G1PrintRegions) { |
| 342 | 3387 gclog_or_tty->print("evacuation failed in heap region "PTR_FORMAT" " |
| 3388 "["PTR_FORMAT","PTR_FORMAT")\n", | |
| 3389 r, r->bottom(), r->end()); | |
| 3390 } | |
| 3391 } | |
| 3392 | |
| 3393 push_on_evac_failure_scan_stack(old); | |
| 3394 | |
| 3395 if (!_drain_in_progress) { | |
| 3396 // prevent recursion in copy_to_survivor_space() | |
| 3397 _drain_in_progress = true; | |
| 3398 drain_evac_failure_scan_stack(); | |
| 3399 _drain_in_progress = false; | |
| 3400 } | |
| 3401 } | |
| 3402 | |
| 3403 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
| 3404 if (m != markOopDesc::prototype()) { | |
| 3405 if (_objs_with_preserved_marks == NULL) { | |
| 3406 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
| 3407 _objs_with_preserved_marks = | |
| 3408 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 3409 _preserved_marks_of_objs = | |
| 3410 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
| 3411 } | |
| 3412 _objs_with_preserved_marks->push(obj); | |
| 3413 _preserved_marks_of_objs->push(m); | |
| 3414 } | |
| 3415 } | |
| 3416 | |
| 3417 // *** Parallel G1 Evacuation | |
| 3418 | |
| 3419 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
| 3420 size_t word_size) { | |
| 3421 HeapRegion* alloc_region = _gc_alloc_regions[purpose]; | |
| 3422 // let the caller handle alloc failure | |
| 3423 if (alloc_region == NULL) return NULL; | |
| 3424 | |
| 3425 HeapWord* block = alloc_region->par_allocate(word_size); | |
| 3426 if (block == NULL) { | |
| 3427 MutexLockerEx x(par_alloc_during_gc_lock(), | |
| 3428 Mutex::_no_safepoint_check_flag); | |
| 3429 block = allocate_during_gc_slow(purpose, alloc_region, true, word_size); | |
| 3430 } | |
| 3431 return block; | |
| 3432 } | |
| 3433 | |
| 545 | 3434 void G1CollectedHeap::retire_alloc_region(HeapRegion* alloc_region, |
| 3435 bool par) { | |
| 3436 // Another thread might have obtained alloc_region for the given | |
| 3437 // purpose, and might be attempting to allocate in it, and might | |
| 3438 // succeed. Therefore, we can't do the "finalization" stuff on the | |
| 3439 // region below until we're sure the last allocation has happened. | |
| 3440 // We ensure this by allocating the remaining space with a garbage | |
| 3441 // object. | |
| 3442 if (par) par_allocate_remaining_space(alloc_region); | |
| 3443 // Now we can do the post-GC stuff on the region. | |
| 3444 alloc_region->note_end_of_copying(); | |
| 3445 g1_policy()->record_after_bytes(alloc_region->used()); | |
| 3446 } | |
| 3447 | |
| 342 | 3448 HeapWord* |
| 3449 G1CollectedHeap::allocate_during_gc_slow(GCAllocPurpose purpose, | |
| 3450 HeapRegion* alloc_region, | |
| 3451 bool par, | |
| 3452 size_t word_size) { | |
| 3453 HeapWord* block = NULL; | |
| 3454 // In the parallel case, a previous thread to obtain the lock may have | |
| 3455 // already assigned a new gc_alloc_region. | |
| 3456 if (alloc_region != _gc_alloc_regions[purpose]) { | |
| 3457 assert(par, "But should only happen in parallel case."); | |
| 3458 alloc_region = _gc_alloc_regions[purpose]; | |
| 3459 if (alloc_region == NULL) return NULL; | |
| 3460 block = alloc_region->par_allocate(word_size); | |
| 3461 if (block != NULL) return block; | |
| 3462 // Otherwise, continue; this new region is empty, too. | |
| 3463 } | |
| 3464 assert(alloc_region != NULL, "We better have an allocation region"); | |
| 545 | 3465 retire_alloc_region(alloc_region, par); |
| 342 | 3466 |
| 3467 if (_gc_alloc_region_counts[purpose] >= g1_policy()->max_regions(purpose)) { | |
| 3468 // Cannot allocate more regions for the given purpose. | |
| 3469 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(purpose); | |
| 3470 // Is there an alternative? | |
| 3471 if (purpose != alt_purpose) { | |
| 3472 HeapRegion* alt_region = _gc_alloc_regions[alt_purpose]; | |
| 3473 // Has not the alternative region been aliased? | |
| 545 | 3474 if (alloc_region != alt_region && alt_region != NULL) { |
| 342 | 3475 // Try to allocate in the alternative region. |
| 3476 if (par) { | |
| 3477 block = alt_region->par_allocate(word_size); | |
| 3478 } else { | |
| 3479 block = alt_region->allocate(word_size); | |
| 3480 } | |
| 3481 // Make an alias. | |
| 3482 _gc_alloc_regions[purpose] = _gc_alloc_regions[alt_purpose]; | |
| 545 | 3483 if (block != NULL) { |
| 3484 return block; | |
| 3485 } | |
| 3486 retire_alloc_region(alt_region, par); | |
| 342 | 3487 } |
| 3488 // Both the allocation region and the alternative one are full | |
| 3489 // and aliased, replace them with a new allocation region. | |
| 3490 purpose = alt_purpose; | |
| 3491 } else { | |
| 3492 set_gc_alloc_region(purpose, NULL); | |
| 3493 return NULL; | |
| 3494 } | |
| 3495 } | |
| 3496 | |
| 3497 // Now allocate a new region for allocation. | |
| 3498 alloc_region = newAllocRegionWithExpansion(purpose, word_size, false /*zero_filled*/); | |
| 3499 | |
| 3500 // let the caller handle alloc failure | |
| 3501 if (alloc_region != NULL) { | |
| 3502 | |
| 3503 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
| 3504 assert(alloc_region->saved_mark_at_top(), | |
| 3505 "Mark should have been saved already."); | |
| 3506 // We used to assert that the region was zero-filled here, but no | |
| 3507 // longer. | |
| 3508 | |
| 3509 // This must be done last: once it's installed, other regions may | |
| 3510 // allocate in it (without holding the lock.) | |
| 3511 set_gc_alloc_region(purpose, alloc_region); | |
| 3512 | |
| 3513 if (par) { | |
| 3514 block = alloc_region->par_allocate(word_size); | |
| 3515 } else { | |
| 3516 block = alloc_region->allocate(word_size); | |
| 3517 } | |
| 3518 // Caller handles alloc failure. | |
| 3519 } else { | |
| 3520 // This sets other apis using the same old alloc region to NULL, also. | |
| 3521 set_gc_alloc_region(purpose, NULL); | |
| 3522 } | |
| 3523 return block; // May be NULL. | |
| 3524 } | |
| 3525 | |
| 3526 void G1CollectedHeap::par_allocate_remaining_space(HeapRegion* r) { | |
| 3527 HeapWord* block = NULL; | |
| 3528 size_t free_words; | |
| 3529 do { | |
| 3530 free_words = r->free()/HeapWordSize; | |
| 3531 // If there's too little space, no one can allocate, so we're done. | |
| 3532 if (free_words < (size_t)oopDesc::header_size()) return; | |
| 3533 // Otherwise, try to claim it. | |
| 3534 block = r->par_allocate(free_words); | |
| 3535 } while (block == NULL); | |
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3536 fill_with_object(block, free_words); |
| 342 | 3537 } |
| 3538 | |
| 3539 #define use_local_bitmaps 1 | |
| 3540 #define verify_local_bitmaps 0 | |
| 3541 | |
| 3542 #ifndef PRODUCT | |
| 3543 | |
| 3544 class GCLabBitMap; | |
| 3545 class GCLabBitMapClosure: public BitMapClosure { | |
| 3546 private: | |
| 3547 ConcurrentMark* _cm; | |
| 3548 GCLabBitMap* _bitmap; | |
| 3549 | |
| 3550 public: | |
| 3551 GCLabBitMapClosure(ConcurrentMark* cm, | |
| 3552 GCLabBitMap* bitmap) { | |
| 3553 _cm = cm; | |
| 3554 _bitmap = bitmap; | |
| 3555 } | |
| 3556 | |
| 3557 virtual bool do_bit(size_t offset); | |
| 3558 }; | |
| 3559 | |
| 3560 #endif // PRODUCT | |
| 3561 | |
| 3562 #define oop_buffer_length 256 | |
| 3563 | |
| 3564 class GCLabBitMap: public BitMap { | |
| 3565 private: | |
| 3566 ConcurrentMark* _cm; | |
| 3567 | |
| 3568 int _shifter; | |
| 3569 size_t _bitmap_word_covers_words; | |
| 3570 | |
| 3571 // beginning of the heap | |
| 3572 HeapWord* _heap_start; | |
| 3573 | |
| 3574 // this is the actual start of the GCLab | |
| 3575 HeapWord* _real_start_word; | |
| 3576 | |
| 3577 // this is the actual end of the GCLab | |
| 3578 HeapWord* _real_end_word; | |
| 3579 | |
| 3580 // this is the first word, possibly located before the actual start | |
| 3581 // of the GCLab, that corresponds to the first bit of the bitmap | |
| 3582 HeapWord* _start_word; | |
| 3583 | |
| 3584 // size of a GCLab in words | |
| 3585 size_t _gclab_word_size; | |
| 3586 | |
| 3587 static int shifter() { | |
| 3588 return MinObjAlignment - 1; | |
| 3589 } | |
| 3590 | |
| 3591 // how many heap words does a single bitmap word corresponds to? | |
| 3592 static size_t bitmap_word_covers_words() { | |
| 3593 return BitsPerWord << shifter(); | |
| 3594 } | |
| 3595 | |
| 3596 static size_t gclab_word_size() { | |
| 751 | 3597 return G1ParallelGCAllocBufferSize / HeapWordSize; |
| 342 | 3598 } |
| 3599 | |
| 3600 static size_t bitmap_size_in_bits() { | |
| 3601 size_t bits_in_bitmap = gclab_word_size() >> shifter(); | |
| 3602 // We are going to ensure that the beginning of a word in this | |
| 3603 // bitmap also corresponds to the beginning of a word in the | |
| 3604 // global marking bitmap. To handle the case where a GCLab | |
| 3605 // starts from the middle of the bitmap, we need to add enough | |
| 3606 // space (i.e. up to a bitmap word) to ensure that we have | |
| 3607 // enough bits in the bitmap. | |
| 3608 return bits_in_bitmap + BitsPerWord - 1; | |
| 3609 } | |
| 3610 public: | |
| 3611 GCLabBitMap(HeapWord* heap_start) | |
| 3612 : BitMap(bitmap_size_in_bits()), | |
| 3613 _cm(G1CollectedHeap::heap()->concurrent_mark()), | |
| 3614 _shifter(shifter()), | |
| 3615 _bitmap_word_covers_words(bitmap_word_covers_words()), | |
| 3616 _heap_start(heap_start), | |
| 3617 _gclab_word_size(gclab_word_size()), | |
| 3618 _real_start_word(NULL), | |
| 3619 _real_end_word(NULL), | |
| 3620 _start_word(NULL) | |
| 3621 { | |
| 3622 guarantee( size_in_words() >= bitmap_size_in_words(), | |
| 3623 "just making sure"); | |
| 3624 } | |
| 3625 | |
| 3626 inline unsigned heapWordToOffset(HeapWord* addr) { | |
| 3627 unsigned offset = (unsigned) pointer_delta(addr, _start_word) >> _shifter; | |
| 3628 assert(offset < size(), "offset should be within bounds"); | |
| 3629 return offset; | |
| 3630 } | |
| 3631 | |
| 3632 inline HeapWord* offsetToHeapWord(size_t offset) { | |
| 3633 HeapWord* addr = _start_word + (offset << _shifter); | |
| 3634 assert(_real_start_word <= addr && addr < _real_end_word, "invariant"); | |
| 3635 return addr; | |
| 3636 } | |
| 3637 | |
| 3638 bool fields_well_formed() { | |
| 3639 bool ret1 = (_real_start_word == NULL) && | |
| 3640 (_real_end_word == NULL) && | |
| 3641 (_start_word == NULL); | |
| 3642 if (ret1) | |
| 3643 return true; | |
| 3644 | |
| 3645 bool ret2 = _real_start_word >= _start_word && | |
| 3646 _start_word < _real_end_word && | |
| 3647 (_real_start_word + _gclab_word_size) == _real_end_word && | |
| 3648 (_start_word + _gclab_word_size + _bitmap_word_covers_words) | |
| 3649 > _real_end_word; | |
| 3650 return ret2; | |
| 3651 } | |
| 3652 | |
| 3653 inline bool mark(HeapWord* addr) { | |
| 3654 guarantee(use_local_bitmaps, "invariant"); | |
| 3655 assert(fields_well_formed(), "invariant"); | |
| 3656 | |
| 3657 if (addr >= _real_start_word && addr < _real_end_word) { | |
| 3658 assert(!isMarked(addr), "should not have already been marked"); | |
| 3659 | |
| 3660 // first mark it on the bitmap | |
| 3661 at_put(heapWordToOffset(addr), true); | |
| 3662 | |
| 3663 return true; | |
| 3664 } else { | |
| 3665 return false; | |
| 3666 } | |
| 3667 } | |
| 3668 | |
| 3669 inline bool isMarked(HeapWord* addr) { | |
| 3670 guarantee(use_local_bitmaps, "invariant"); | |
| 3671 assert(fields_well_formed(), "invariant"); | |
| 3672 | |
| 3673 return at(heapWordToOffset(addr)); | |
| 3674 } | |
| 3675 | |
| 3676 void set_buffer(HeapWord* start) { | |
| 3677 guarantee(use_local_bitmaps, "invariant"); | |
| 3678 clear(); | |
| 3679 | |
| 3680 assert(start != NULL, "invariant"); | |
| 3681 _real_start_word = start; | |
| 3682 _real_end_word = start + _gclab_word_size; | |
| 3683 | |
| 3684 size_t diff = | |
| 3685 pointer_delta(start, _heap_start) % _bitmap_word_covers_words; | |
| 3686 _start_word = start - diff; | |
| 3687 | |
| 3688 assert(fields_well_formed(), "invariant"); | |
| 3689 } | |
| 3690 | |
| 3691 #ifndef PRODUCT | |
| 3692 void verify() { | |
| 3693 // verify that the marks have been propagated | |
| 3694 GCLabBitMapClosure cl(_cm, this); | |
| 3695 iterate(&cl); | |
| 3696 } | |
| 3697 #endif // PRODUCT | |
| 3698 | |
| 3699 void retire() { | |
| 3700 guarantee(use_local_bitmaps, "invariant"); | |
| 3701 assert(fields_well_formed(), "invariant"); | |
| 3702 | |
| 3703 if (_start_word != NULL) { | |
| 3704 CMBitMap* mark_bitmap = _cm->nextMarkBitMap(); | |
| 3705 | |
| 3706 // this means that the bitmap was set up for the GCLab | |
| 3707 assert(_real_start_word != NULL && _real_end_word != NULL, "invariant"); | |
| 3708 | |
| 3709 mark_bitmap->mostly_disjoint_range_union(this, | |
| 3710 0, // always start from the start of the bitmap | |
| 3711 _start_word, | |
| 3712 size_in_words()); | |
| 3713 _cm->grayRegionIfNecessary(MemRegion(_real_start_word, _real_end_word)); | |
| 3714 | |
| 3715 #ifndef PRODUCT | |
| 3716 if (use_local_bitmaps && verify_local_bitmaps) | |
| 3717 verify(); | |
| 3718 #endif // PRODUCT | |
| 3719 } else { | |
| 3720 assert(_real_start_word == NULL && _real_end_word == NULL, "invariant"); | |
| 3721 } | |
| 3722 } | |
| 3723 | |
| 3724 static size_t bitmap_size_in_words() { | |
| 3725 return (bitmap_size_in_bits() + BitsPerWord - 1) / BitsPerWord; | |
| 3726 } | |
| 3727 }; | |
| 3728 | |
| 3729 #ifndef PRODUCT | |
| 3730 | |
| 3731 bool GCLabBitMapClosure::do_bit(size_t offset) { | |
| 3732 HeapWord* addr = _bitmap->offsetToHeapWord(offset); | |
| 3733 guarantee(_cm->isMarked(oop(addr)), "it should be!"); | |
| 3734 return true; | |
| 3735 } | |
| 3736 | |
| 3737 #endif // PRODUCT | |
| 3738 | |
| 3739 class G1ParGCAllocBuffer: public ParGCAllocBuffer { | |
| 3740 private: | |
| 3741 bool _retired; | |
| 3742 bool _during_marking; | |
| 3743 GCLabBitMap _bitmap; | |
| 3744 | |
| 3745 public: | |
| 3746 G1ParGCAllocBuffer() : | |
| 751 | 3747 ParGCAllocBuffer(G1ParallelGCAllocBufferSize / HeapWordSize), |
| 342 | 3748 _during_marking(G1CollectedHeap::heap()->mark_in_progress()), |
| 3749 _bitmap(G1CollectedHeap::heap()->reserved_region().start()), | |
| 3750 _retired(false) | |
| 3751 { } | |
| 3752 | |
| 3753 inline bool mark(HeapWord* addr) { | |
| 3754 guarantee(use_local_bitmaps, "invariant"); | |
| 3755 assert(_during_marking, "invariant"); | |
| 3756 return _bitmap.mark(addr); | |
| 3757 } | |
| 3758 | |
| 3759 inline void set_buf(HeapWord* buf) { | |
| 3760 if (use_local_bitmaps && _during_marking) | |
| 3761 _bitmap.set_buffer(buf); | |
| 3762 ParGCAllocBuffer::set_buf(buf); | |
| 3763 _retired = false; | |
| 3764 } | |
| 3765 | |
| 3766 inline void retire(bool end_of_gc, bool retain) { | |
| 3767 if (_retired) | |
| 3768 return; | |
| 3769 if (use_local_bitmaps && _during_marking) { | |
| 3770 _bitmap.retire(); | |
| 3771 } | |
| 3772 ParGCAllocBuffer::retire(end_of_gc, retain); | |
| 3773 _retired = true; | |
| 3774 } | |
| 3775 }; | |
| 3776 | |
| 3777 | |
| 3778 class G1ParScanThreadState : public StackObj { | |
| 3779 protected: | |
| 3780 G1CollectedHeap* _g1h; | |
| 3781 RefToScanQueue* _refs; | |
|
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3782 DirtyCardQueue _dcq; |
|
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3783 CardTableModRefBS* _ct_bs; |
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3784 G1RemSet* _g1_rem; |
| 342 | 3785 |
| 3786 typedef GrowableArray<oop*> OverflowQueue; | |
| 3787 OverflowQueue* _overflowed_refs; | |
| 3788 | |
| 3789 G1ParGCAllocBuffer _alloc_buffers[GCAllocPurposeCount]; | |
| 545 | 3790 ageTable _age_table; |
| 342 | 3791 |
| 3792 size_t _alloc_buffer_waste; | |
| 3793 size_t _undo_waste; | |
| 3794 | |
| 3795 OopsInHeapRegionClosure* _evac_failure_cl; | |
| 3796 G1ParScanHeapEvacClosure* _evac_cl; | |
| 3797 G1ParScanPartialArrayClosure* _partial_scan_cl; | |
| 3798 | |
| 3799 int _hash_seed; | |
| 3800 int _queue_num; | |
| 3801 | |
| 3802 int _term_attempts; | |
| 3803 #if G1_DETAILED_STATS | |
| 3804 int _pushes, _pops, _steals, _steal_attempts; | |
| 3805 int _overflow_pushes; | |
| 3806 #endif | |
| 3807 | |
| 3808 double _start; | |
| 3809 double _start_strong_roots; | |
| 3810 double _strong_roots_time; | |
| 3811 double _start_term; | |
| 3812 double _term_time; | |
| 3813 | |
| 3814 // Map from young-age-index (0 == not young, 1 is youngest) to | |
| 3815 // surviving words. base is what we get back from the malloc call | |
| 3816 size_t* _surviving_young_words_base; | |
| 3817 // this points into the array, as we use the first few entries for padding | |
| 3818 size_t* _surviving_young_words; | |
| 3819 | |
| 3820 #define PADDING_ELEM_NUM (64 / sizeof(size_t)) | |
| 3821 | |
| 3822 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } | |
| 3823 | |
| 3824 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } | |
| 3825 | |
|
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3826 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
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3827 CardTableModRefBS* ctbs() { return _ct_bs; } |
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3828 |
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3829 void immediate_rs_update(HeapRegion* from, oop* p, int tid) { |
|
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3830 if (!from->is_survivor()) { |
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3831 _g1_rem->par_write_ref(from, p, tid); |
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3832 } |
|
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3833 } |
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3834 |
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3835 void deferred_rs_update(HeapRegion* from, oop* p, int tid) { |
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3836 // If the new value of the field points to the same region or |
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3837 // is the to-space, we don't need to include it in the Rset updates. |
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3838 if (!from->is_in_reserved(*p) && !from->is_survivor()) { |
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3839 size_t card_index = ctbs()->index_for(p); |
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3840 // If the card hasn't been added to the buffer, do it. |
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3841 if (ctbs()->mark_card_deferred(card_index)) { |
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3842 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
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3843 } |
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3844 } |
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3845 } |
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3846 |
| 342 | 3847 public: |
| 3848 G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) | |
| 3849 : _g1h(g1h), | |
| 3850 _refs(g1h->task_queue(queue_num)), | |
|
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3851 _dcq(&g1h->dirty_card_queue_set()), |
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3852 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
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3853 _g1_rem(g1h->g1_rem_set()), |
| 342 | 3854 _hash_seed(17), _queue_num(queue_num), |
| 3855 _term_attempts(0), | |
| 545 | 3856 _age_table(false), |
| 342 | 3857 #if G1_DETAILED_STATS |
| 3858 _pushes(0), _pops(0), _steals(0), | |
| 3859 _steal_attempts(0), _overflow_pushes(0), | |
| 3860 #endif | |
| 3861 _strong_roots_time(0), _term_time(0), | |
| 3862 _alloc_buffer_waste(0), _undo_waste(0) | |
| 3863 { | |
| 3864 // we allocate G1YoungSurvRateNumRegions plus one entries, since | |
| 3865 // we "sacrifice" entry 0 to keep track of surviving bytes for | |
| 3866 // non-young regions (where the age is -1) | |
| 3867 // We also add a few elements at the beginning and at the end in | |
| 3868 // an attempt to eliminate cache contention | |
| 3869 size_t real_length = 1 + _g1h->g1_policy()->young_cset_length(); | |
| 3870 size_t array_length = PADDING_ELEM_NUM + | |
| 3871 real_length + | |
| 3872 PADDING_ELEM_NUM; | |
| 3873 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); | |
| 3874 if (_surviving_young_words_base == NULL) | |
| 3875 vm_exit_out_of_memory(array_length * sizeof(size_t), | |
| 3876 "Not enough space for young surv histo."); | |
| 3877 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; | |
| 3878 memset(_surviving_young_words, 0, real_length * sizeof(size_t)); | |
| 3879 | |
| 3880 _overflowed_refs = new OverflowQueue(10); | |
| 3881 | |
| 3882 _start = os::elapsedTime(); | |
| 3883 } | |
| 3884 | |
| 3885 ~G1ParScanThreadState() { | |
| 3886 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base); | |
| 3887 } | |
| 3888 | |
| 3889 RefToScanQueue* refs() { return _refs; } | |
| 3890 OverflowQueue* overflowed_refs() { return _overflowed_refs; } | |
| 545 | 3891 ageTable* age_table() { return &_age_table; } |
| 3892 | |
| 3893 G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) { | |
| 342 | 3894 return &_alloc_buffers[purpose]; |
| 3895 } | |
| 3896 | |
| 3897 size_t alloc_buffer_waste() { return _alloc_buffer_waste; } | |
| 3898 size_t undo_waste() { return _undo_waste; } | |
| 3899 | |
| 3900 void push_on_queue(oop* ref) { | |
| 526 | 3901 assert(ref != NULL, "invariant"); |
| 3902 assert(has_partial_array_mask(ref) || _g1h->obj_in_cs(*ref), "invariant"); | |
| 3903 | |
| 342 | 3904 if (!refs()->push(ref)) { |
| 3905 overflowed_refs()->push(ref); | |
| 3906 IF_G1_DETAILED_STATS(note_overflow_push()); | |
| 3907 } else { | |
| 3908 IF_G1_DETAILED_STATS(note_push()); | |
| 3909 } | |
| 3910 } | |
| 3911 | |
| 3912 void pop_from_queue(oop*& ref) { | |
| 3913 if (!refs()->pop_local(ref)) { | |
| 3914 ref = NULL; | |
| 3915 } else { | |
| 526 | 3916 assert(ref != NULL, "invariant"); |
| 3917 assert(has_partial_array_mask(ref) || _g1h->obj_in_cs(*ref), | |
| 3918 "invariant"); | |
| 3919 | |
| 342 | 3920 IF_G1_DETAILED_STATS(note_pop()); |
| 3921 } | |
| 3922 } | |
| 3923 | |
| 3924 void pop_from_overflow_queue(oop*& ref) { | |
| 3925 ref = overflowed_refs()->pop(); | |
| 3926 } | |
| 3927 | |
| 3928 int refs_to_scan() { return refs()->size(); } | |
| 3929 int overflowed_refs_to_scan() { return overflowed_refs()->length(); } | |
| 3930 | |
|
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3931 void update_rs(HeapRegion* from, oop* p, int tid) { |
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3932 if (G1DeferredRSUpdate) { |
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3933 deferred_rs_update(from, p, tid); |
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3934 } else { |
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3935 immediate_rs_update(from, p, tid); |
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3936 } |
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3937 } |
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3938 |
| 342 | 3939 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
| 3940 | |
| 3941 HeapWord* obj = NULL; | |
| 3942 if (word_sz * 100 < | |
| 751 | 3943 (size_t)(G1ParallelGCAllocBufferSize / HeapWordSize) * |
| 342 | 3944 ParallelGCBufferWastePct) { |
| 3945 G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose); | |
| 3946 add_to_alloc_buffer_waste(alloc_buf->words_remaining()); | |
| 3947 alloc_buf->retire(false, false); | |
| 3948 | |
| 3949 HeapWord* buf = | |
| 751 | 3950 _g1h->par_allocate_during_gc(purpose, G1ParallelGCAllocBufferSize / HeapWordSize); |
| 342 | 3951 if (buf == NULL) return NULL; // Let caller handle allocation failure. |
| 3952 // Otherwise. | |
| 3953 alloc_buf->set_buf(buf); | |
| 3954 | |
| 3955 obj = alloc_buf->allocate(word_sz); | |
| 3956 assert(obj != NULL, "buffer was definitely big enough..."); | |
| 526 | 3957 } else { |
| 342 | 3958 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
| 3959 } | |
| 3960 return obj; | |
| 3961 } | |
| 3962 | |
| 3963 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { | |
| 3964 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); | |
| 3965 if (obj != NULL) return obj; | |
| 3966 return allocate_slow(purpose, word_sz); | |
| 3967 } | |
| 3968 | |
| 3969 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { | |
| 3970 if (alloc_buffer(purpose)->contains(obj)) { | |
| 3971 guarantee(alloc_buffer(purpose)->contains(obj + word_sz - 1), | |
| 3972 "should contain whole object"); | |
| 3973 alloc_buffer(purpose)->undo_allocation(obj, word_sz); | |
|
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3974 } else { |
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3975 CollectedHeap::fill_with_object(obj, word_sz); |
| 342 | 3976 add_to_undo_waste(word_sz); |
| 3977 } | |
| 3978 } | |
| 3979 | |
| 3980 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { | |
| 3981 _evac_failure_cl = evac_failure_cl; | |
| 3982 } | |
| 3983 OopsInHeapRegionClosure* evac_failure_closure() { | |
| 3984 return _evac_failure_cl; | |
| 3985 } | |
| 3986 | |
| 3987 void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) { | |
| 3988 _evac_cl = evac_cl; | |
| 3989 } | |
| 3990 | |
| 3991 void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) { | |
| 3992 _partial_scan_cl = partial_scan_cl; | |
| 3993 } | |
| 3994 | |
| 3995 int* hash_seed() { return &_hash_seed; } | |
| 3996 int queue_num() { return _queue_num; } | |
| 3997 | |
| 3998 int term_attempts() { return _term_attempts; } | |
| 3999 void note_term_attempt() { _term_attempts++; } | |
| 4000 | |
| 4001 #if G1_DETAILED_STATS | |
| 4002 int pushes() { return _pushes; } | |
| 4003 int pops() { return _pops; } | |
| 4004 int steals() { return _steals; } | |
| 4005 int steal_attempts() { return _steal_attempts; } | |
| 4006 int overflow_pushes() { return _overflow_pushes; } | |
| 4007 | |
| 4008 void note_push() { _pushes++; } | |
| 4009 void note_pop() { _pops++; } | |
| 4010 void note_steal() { _steals++; } | |
| 4011 void note_steal_attempt() { _steal_attempts++; } | |
| 4012 void note_overflow_push() { _overflow_pushes++; } | |
| 4013 #endif | |
| 4014 | |
| 4015 void start_strong_roots() { | |
| 4016 _start_strong_roots = os::elapsedTime(); | |
| 4017 } | |
| 4018 void end_strong_roots() { | |
| 4019 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); | |
| 4020 } | |
| 4021 double strong_roots_time() { return _strong_roots_time; } | |
| 4022 | |
| 4023 void start_term_time() { | |
| 4024 note_term_attempt(); | |
| 4025 _start_term = os::elapsedTime(); | |
| 4026 } | |
| 4027 void end_term_time() { | |
| 4028 _term_time += (os::elapsedTime() - _start_term); | |
| 4029 } | |
| 4030 double term_time() { return _term_time; } | |
| 4031 | |
| 4032 double elapsed() { | |
| 4033 return os::elapsedTime() - _start; | |
| 4034 } | |
| 4035 | |
| 4036 size_t* surviving_young_words() { | |
| 4037 // We add on to hide entry 0 which accumulates surviving words for | |
| 4038 // age -1 regions (i.e. non-young ones) | |
| 4039 return _surviving_young_words; | |
| 4040 } | |
| 4041 | |
| 4042 void retire_alloc_buffers() { | |
| 4043 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 4044 size_t waste = _alloc_buffers[ap].words_remaining(); | |
| 4045 add_to_alloc_buffer_waste(waste); | |
| 4046 _alloc_buffers[ap].retire(true, false); | |
| 4047 } | |
| 4048 } | |
| 4049 | |
| 526 | 4050 private: |
| 4051 void deal_with_reference(oop* ref_to_scan) { | |
| 4052 if (has_partial_array_mask(ref_to_scan)) { | |
| 4053 _partial_scan_cl->do_oop_nv(ref_to_scan); | |
| 4054 } else { | |
| 4055 // Note: we can use "raw" versions of "region_containing" because | |
| 4056 // "obj_to_scan" is definitely in the heap, and is not in a | |
| 4057 // humongous region. | |
| 4058 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); | |
| 4059 _evac_cl->set_region(r); | |
| 4060 _evac_cl->do_oop_nv(ref_to_scan); | |
| 4061 } | |
| 4062 } | |
| 4063 | |
| 4064 public: | |
| 342 | 4065 void trim_queue() { |
| 526 | 4066 // I've replicated the loop twice, first to drain the overflow |
| 4067 // queue, second to drain the task queue. This is better than | |
| 4068 // having a single loop, which checks both conditions and, inside | |
| 4069 // it, either pops the overflow queue or the task queue, as each | |
| 4070 // loop is tighter. Also, the decision to drain the overflow queue | |
| 4071 // first is not arbitrary, as the overflow queue is not visible | |
| 4072 // to the other workers, whereas the task queue is. So, we want to | |
| 4073 // drain the "invisible" entries first, while allowing the other | |
| 4074 // workers to potentially steal the "visible" entries. | |
| 4075 | |
| 342 | 4076 while (refs_to_scan() > 0 || overflowed_refs_to_scan() > 0) { |
| 526 | 4077 while (overflowed_refs_to_scan() > 0) { |
| 4078 oop *ref_to_scan = NULL; | |
| 342 | 4079 pop_from_overflow_queue(ref_to_scan); |
| 526 | 4080 assert(ref_to_scan != NULL, "invariant"); |
| 4081 // We shouldn't have pushed it on the queue if it was not | |
| 4082 // pointing into the CSet. | |
| 4083 assert(ref_to_scan != NULL, "sanity"); | |
| 4084 assert(has_partial_array_mask(ref_to_scan) || | |
| 4085 _g1h->obj_in_cs(*ref_to_scan), "sanity"); | |
| 4086 | |
| 4087 deal_with_reference(ref_to_scan); | |
| 342 | 4088 } |
| 526 | 4089 |
| 4090 while (refs_to_scan() > 0) { | |
| 4091 oop *ref_to_scan = NULL; | |
| 4092 pop_from_queue(ref_to_scan); | |
| 4093 | |
| 4094 if (ref_to_scan != NULL) { | |
| 4095 // We shouldn't have pushed it on the queue if it was not | |
| 4096 // pointing into the CSet. | |
| 4097 assert(has_partial_array_mask(ref_to_scan) || | |
| 4098 _g1h->obj_in_cs(*ref_to_scan), "sanity"); | |
| 4099 | |
| 4100 deal_with_reference(ref_to_scan); | |
| 342 | 4101 } |
| 4102 } | |
| 4103 } | |
| 4104 } | |
| 4105 }; | |
| 4106 | |
| 4107 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : | |
| 4108 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), | |
| 4109 _par_scan_state(par_scan_state) { } | |
| 4110 | |
| 4111 // This closure is applied to the fields of the objects that have just been copied. | |
| 4112 // Should probably be made inline and moved in g1OopClosures.inline.hpp. | |
| 4113 void G1ParScanClosure::do_oop_nv(oop* p) { | |
| 4114 oop obj = *p; | |
| 526 | 4115 |
| 342 | 4116 if (obj != NULL) { |
| 526 | 4117 if (_g1->in_cset_fast_test(obj)) { |
| 4118 // We're not going to even bother checking whether the object is | |
| 4119 // already forwarded or not, as this usually causes an immediate | |
| 4120 // stall. We'll try to prefetch the object (for write, given that | |
| 4121 // we might need to install the forwarding reference) and we'll | |
| 4122 // get back to it when pop it from the queue | |
| 4123 Prefetch::write(obj->mark_addr(), 0); | |
| 4124 Prefetch::read(obj->mark_addr(), (HeapWordSize*2)); | |
| 4125 | |
| 4126 // slightly paranoid test; I'm trying to catch potential | |
| 4127 // problems before we go into push_on_queue to know where the | |
| 4128 // problem is coming from | |
| 4129 assert(obj == *p, "the value of *p should not have changed"); | |
| 4130 _par_scan_state->push_on_queue(p); | |
| 4131 } else { | |
|
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4132 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 342 | 4133 } |
| 4134 } | |
| 4135 } | |
| 4136 | |
| 4137 void G1ParCopyHelper::mark_forwardee(oop* p) { | |
| 4138 // This is called _after_ do_oop_work has been called, hence after | |
| 4139 // the object has been relocated to its new location and *p points | |
| 4140 // to its new location. | |
| 4141 | |
| 4142 oop thisOop = *p; | |
| 4143 if (thisOop != NULL) { | |
| 4144 assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(thisOop)), | |
| 4145 "shouldn't still be in the CSet if evacuation didn't fail."); | |
| 4146 HeapWord* addr = (HeapWord*)thisOop; | |
| 4147 if (_g1->is_in_g1_reserved(addr)) | |
| 4148 _cm->grayRoot(oop(addr)); | |
| 4149 } | |
| 4150 } | |
| 4151 | |
| 4152 oop G1ParCopyHelper::copy_to_survivor_space(oop old) { | |
| 4153 size_t word_sz = old->size(); | |
| 4154 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
| 4155 // +1 to make the -1 indexes valid... | |
| 4156 int young_index = from_region->young_index_in_cset()+1; | |
| 4157 assert( (from_region->is_young() && young_index > 0) || | |
| 4158 (!from_region->is_young() && young_index == 0), "invariant" ); | |
| 4159 G1CollectorPolicy* g1p = _g1->g1_policy(); | |
| 4160 markOop m = old->mark(); | |
| 545 | 4161 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
| 4162 : m->age(); | |
| 4163 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
| 342 | 4164 word_sz); |
| 4165 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
| 4166 oop obj = oop(obj_ptr); | |
| 4167 | |
| 4168 if (obj_ptr == NULL) { | |
| 4169 // This will either forward-to-self, or detect that someone else has | |
| 4170 // installed a forwarding pointer. | |
| 4171 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
| 4172 return _g1->handle_evacuation_failure_par(cl, old); | |
| 4173 } | |
| 4174 | |
| 526 | 4175 // We're going to allocate linearly, so might as well prefetch ahead. |
| 4176 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
| 4177 | |
| 342 | 4178 oop forward_ptr = old->forward_to_atomic(obj); |
| 4179 if (forward_ptr == NULL) { | |
| 4180 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
| 526 | 4181 if (g1p->track_object_age(alloc_purpose)) { |
| 4182 // We could simply do obj->incr_age(). However, this causes a | |
| 4183 // performance issue. obj->incr_age() will first check whether | |
| 4184 // the object has a displaced mark by checking its mark word; | |
| 4185 // getting the mark word from the new location of the object | |
| 4186 // stalls. So, given that we already have the mark word and we | |
| 4187 // are about to install it anyway, it's better to increase the | |
| 4188 // age on the mark word, when the object does not have a | |
| 4189 // displaced mark word. We're not expecting many objects to have | |
| 4190 // a displaced marked word, so that case is not optimized | |
| 4191 // further (it could be...) and we simply call obj->incr_age(). | |
| 4192 | |
| 4193 if (m->has_displaced_mark_helper()) { | |
| 4194 // in this case, we have to install the mark word first, | |
| 4195 // otherwise obj looks to be forwarded (the old mark word, | |
| 4196 // which contains the forward pointer, was copied) | |
| 4197 obj->set_mark(m); | |
| 4198 obj->incr_age(); | |
| 4199 } else { | |
| 4200 m = m->incr_age(); | |
| 545 | 4201 obj->set_mark(m); |
| 526 | 4202 } |
| 545 | 4203 _par_scan_state->age_table()->add(obj, word_sz); |
| 4204 } else { | |
| 4205 obj->set_mark(m); | |
| 526 | 4206 } |
| 4207 | |
| 342 | 4208 // preserve "next" mark bit |
| 4209 if (_g1->mark_in_progress() && !_g1->is_obj_ill(old)) { | |
| 4210 if (!use_local_bitmaps || | |
| 4211 !_par_scan_state->alloc_buffer(alloc_purpose)->mark(obj_ptr)) { | |
| 4212 // if we couldn't mark it on the local bitmap (this happens when | |
| 4213 // the object was not allocated in the GCLab), we have to bite | |
| 4214 // the bullet and do the standard parallel mark | |
| 4215 _cm->markAndGrayObjectIfNecessary(obj); | |
| 4216 } | |
| 4217 #if 1 | |
| 4218 if (_g1->isMarkedNext(old)) { | |
| 4219 _cm->nextMarkBitMap()->parClear((HeapWord*)old); | |
| 4220 } | |
| 4221 #endif | |
| 4222 } | |
| 4223 | |
| 4224 size_t* surv_young_words = _par_scan_state->surviving_young_words(); | |
| 4225 surv_young_words[young_index] += word_sz; | |
| 4226 | |
| 4227 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
| 4228 arrayOop(old)->set_length(0); | |
| 526 | 4229 _par_scan_state->push_on_queue(set_partial_array_mask(old)); |
| 342 | 4230 } else { |
| 526 | 4231 // No point in using the slower heap_region_containing() method, |
| 4232 // given that we know obj is in the heap. | |
| 4233 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
| 342 | 4234 obj->oop_iterate_backwards(_scanner); |
| 4235 } | |
| 4236 } else { | |
| 4237 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
| 4238 obj = forward_ptr; | |
| 4239 } | |
| 4240 return obj; | |
| 4241 } | |
| 4242 | |
| 526 | 4243 template<bool do_gen_barrier, G1Barrier barrier, |
| 4244 bool do_mark_forwardee, bool skip_cset_test> | |
| 4245 void G1ParCopyClosure<do_gen_barrier, barrier, | |
| 4246 do_mark_forwardee, skip_cset_test>::do_oop_work(oop* p) { | |
| 342 | 4247 oop obj = *p; |
| 4248 assert(barrier != G1BarrierRS || obj != NULL, | |
| 4249 "Precondition: G1BarrierRS implies obj is nonNull"); | |
| 4250 | |
| 526 | 4251 // The only time we skip the cset test is when we're scanning |
| 4252 // references popped from the queue. And we only push on the queue | |
| 4253 // references that we know point into the cset, so no point in | |
| 4254 // checking again. But we'll leave an assert here for peace of mind. | |
| 4255 assert(!skip_cset_test || _g1->obj_in_cs(obj), "invariant"); | |
| 4256 | |
| 4257 // here the null check is implicit in the cset_fast_test() test | |
| 4258 if (skip_cset_test || _g1->in_cset_fast_test(obj)) { | |
| 342 | 4259 #if G1_REM_SET_LOGGING |
| 526 | 4260 gclog_or_tty->print_cr("Loc "PTR_FORMAT" contains pointer "PTR_FORMAT" " |
| 4261 "into CS.", p, (void*) obj); | |
| 342 | 4262 #endif |
| 526 | 4263 if (obj->is_forwarded()) { |
| 4264 *p = obj->forwardee(); | |
| 4265 } else { | |
| 4266 *p = copy_to_survivor_space(obj); | |
| 342 | 4267 } |
| 526 | 4268 // When scanning the RS, we only care about objs in CS. |
| 4269 if (barrier == G1BarrierRS) { | |
|
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4270 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 342 | 4271 } |
| 526 | 4272 } |
| 4273 | |
| 4274 // When scanning moved objs, must look at all oops. | |
| 4275 if (barrier == G1BarrierEvac && obj != NULL) { | |
|
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4276 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 526 | 4277 } |
| 4278 | |
| 4279 if (do_gen_barrier && obj != NULL) { | |
| 4280 par_do_barrier(p); | |
| 4281 } | |
| 4282 } | |
| 4283 | |
| 4284 template void G1ParCopyClosure<false, G1BarrierEvac, false, true>::do_oop_work(oop* p); | |
| 4285 | |
| 4286 template<class T> void G1ParScanPartialArrayClosure::process_array_chunk( | |
| 342 | 4287 oop obj, int start, int end) { |
| 4288 // process our set of indices (include header in first chunk) | |
| 4289 assert(start < end, "invariant"); | |
| 4290 T* const base = (T*)objArrayOop(obj)->base(); | |
| 526 | 4291 T* const start_addr = (start == 0) ? (T*) obj : base + start; |
| 342 | 4292 T* const end_addr = base + end; |
| 4293 MemRegion mr((HeapWord*)start_addr, (HeapWord*)end_addr); | |
| 4294 _scanner.set_region(_g1->heap_region_containing(obj)); | |
| 4295 obj->oop_iterate(&_scanner, mr); | |
| 4296 } | |
| 4297 | |
| 4298 void G1ParScanPartialArrayClosure::do_oop_nv(oop* p) { | |
| 4299 assert(!UseCompressedOops, "Needs to be fixed to work with compressed oops"); | |
| 526 | 4300 assert(has_partial_array_mask(p), "invariant"); |
| 4301 oop old = clear_partial_array_mask(p); | |
| 342 | 4302 assert(old->is_objArray(), "must be obj array"); |
| 4303 assert(old->is_forwarded(), "must be forwarded"); | |
| 4304 assert(Universe::heap()->is_in_reserved(old), "must be in heap."); | |
| 4305 | |
| 4306 objArrayOop obj = objArrayOop(old->forwardee()); | |
| 4307 assert((void*)old != (void*)old->forwardee(), "self forwarding here?"); | |
| 4308 // Process ParGCArrayScanChunk elements now | |
| 4309 // and push the remainder back onto queue | |
| 4310 int start = arrayOop(old)->length(); | |
| 4311 int end = obj->length(); | |
| 4312 int remainder = end - start; | |
| 4313 assert(start <= end, "just checking"); | |
| 4314 if (remainder > 2 * ParGCArrayScanChunk) { | |
| 4315 // Test above combines last partial chunk with a full chunk | |
| 4316 end = start + ParGCArrayScanChunk; | |
| 4317 arrayOop(old)->set_length(end); | |
| 4318 // Push remainder. | |
| 526 | 4319 _par_scan_state->push_on_queue(set_partial_array_mask(old)); |
| 342 | 4320 } else { |
| 4321 // Restore length so that the heap remains parsable in | |
| 4322 // case of evacuation failure. | |
| 4323 arrayOop(old)->set_length(end); | |
| 4324 } | |
| 4325 | |
| 4326 // process our set of indices (include header in first chunk) | |
| 4327 process_array_chunk<oop>(obj, start, end); | |
| 4328 } | |
| 4329 | |
| 4330 int G1ScanAndBalanceClosure::_nq = 0; | |
| 4331 | |
| 4332 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
| 4333 protected: | |
| 4334 G1CollectedHeap* _g1h; | |
| 4335 G1ParScanThreadState* _par_scan_state; | |
| 4336 RefToScanQueueSet* _queues; | |
| 4337 ParallelTaskTerminator* _terminator; | |
| 4338 | |
| 4339 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
| 4340 RefToScanQueueSet* queues() { return _queues; } | |
| 4341 ParallelTaskTerminator* terminator() { return _terminator; } | |
| 4342 | |
| 4343 public: | |
| 4344 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
| 4345 G1ParScanThreadState* par_scan_state, | |
| 4346 RefToScanQueueSet* queues, | |
| 4347 ParallelTaskTerminator* terminator) | |
| 4348 : _g1h(g1h), _par_scan_state(par_scan_state), | |
| 4349 _queues(queues), _terminator(terminator) {} | |
| 4350 | |
| 4351 void do_void() { | |
| 4352 G1ParScanThreadState* pss = par_scan_state(); | |
| 4353 while (true) { | |
| 4354 oop* ref_to_scan; | |
| 4355 pss->trim_queue(); | |
| 4356 IF_G1_DETAILED_STATS(pss->note_steal_attempt()); | |
| 4357 if (queues()->steal(pss->queue_num(), | |
| 4358 pss->hash_seed(), | |
| 4359 ref_to_scan)) { | |
| 4360 IF_G1_DETAILED_STATS(pss->note_steal()); | |
| 526 | 4361 |
| 4362 // slightly paranoid tests; I'm trying to catch potential | |
| 4363 // problems before we go into push_on_queue to know where the | |
| 4364 // problem is coming from | |
| 4365 assert(ref_to_scan != NULL, "invariant"); | |
| 4366 assert(has_partial_array_mask(ref_to_scan) || | |
| 4367 _g1h->obj_in_cs(*ref_to_scan), "invariant"); | |
| 342 | 4368 pss->push_on_queue(ref_to_scan); |
| 4369 continue; | |
| 4370 } | |
| 4371 pss->start_term_time(); | |
| 4372 if (terminator()->offer_termination()) break; | |
| 4373 pss->end_term_time(); | |
| 4374 } | |
| 4375 pss->end_term_time(); | |
| 4376 pss->retire_alloc_buffers(); | |
| 4377 } | |
| 4378 }; | |
| 4379 | |
| 4380 class G1ParTask : public AbstractGangTask { | |
| 4381 protected: | |
| 4382 G1CollectedHeap* _g1h; | |
| 4383 RefToScanQueueSet *_queues; | |
| 4384 ParallelTaskTerminator _terminator; | |
| 4385 | |
| 4386 Mutex _stats_lock; | |
| 4387 Mutex* stats_lock() { return &_stats_lock; } | |
| 4388 | |
| 4389 size_t getNCards() { | |
| 4390 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
| 4391 / G1BlockOffsetSharedArray::N_bytes; | |
| 4392 } | |
| 4393 | |
| 4394 public: | |
| 4395 G1ParTask(G1CollectedHeap* g1h, int workers, RefToScanQueueSet *task_queues) | |
| 4396 : AbstractGangTask("G1 collection"), | |
| 4397 _g1h(g1h), | |
| 4398 _queues(task_queues), | |
| 4399 _terminator(workers, _queues), | |
| 4400 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true) | |
| 4401 {} | |
| 4402 | |
| 4403 RefToScanQueueSet* queues() { return _queues; } | |
| 4404 | |
| 4405 RefToScanQueue *work_queue(int i) { | |
| 4406 return queues()->queue(i); | |
| 4407 } | |
| 4408 | |
| 4409 void work(int i) { | |
| 4410 ResourceMark rm; | |
| 4411 HandleMark hm; | |
| 4412 | |
| 526 | 4413 G1ParScanThreadState pss(_g1h, i); |
| 4414 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss); | |
| 4415 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss); | |
| 4416 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss); | |
| 342 | 4417 |
| 4418 pss.set_evac_closure(&scan_evac_cl); | |
| 4419 pss.set_evac_failure_closure(&evac_failure_cl); | |
| 4420 pss.set_partial_scan_closure(&partial_scan_cl); | |
| 4421 | |
| 4422 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss); | |
| 4423 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss); | |
| 4424 G1ParScanHeapRSClosure only_scan_heap_rs_cl(_g1h, &pss); | |
|
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4425 |
| 342 | 4426 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss); |
| 4427 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss); | |
| 4428 G1ParScanAndMarkHeapRSClosure scan_mark_heap_rs_cl(_g1h, &pss); | |
| 4429 | |
| 4430 OopsInHeapRegionClosure *scan_root_cl; | |
| 4431 OopsInHeapRegionClosure *scan_perm_cl; | |
| 4432 OopsInHeapRegionClosure *scan_so_cl; | |
| 4433 | |
| 4434 if (_g1h->g1_policy()->should_initiate_conc_mark()) { | |
| 4435 scan_root_cl = &scan_mark_root_cl; | |
| 4436 scan_perm_cl = &scan_mark_perm_cl; | |
| 4437 scan_so_cl = &scan_mark_heap_rs_cl; | |
| 4438 } else { | |
| 4439 scan_root_cl = &only_scan_root_cl; | |
| 4440 scan_perm_cl = &only_scan_perm_cl; | |
| 4441 scan_so_cl = &only_scan_heap_rs_cl; | |
| 4442 } | |
| 4443 | |
| 4444 pss.start_strong_roots(); | |
| 4445 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
| 4446 SharedHeap::SO_AllClasses, | |
| 4447 scan_root_cl, | |
| 4448 &only_scan_heap_rs_cl, | |
| 4449 scan_so_cl, | |
| 4450 scan_perm_cl, | |
| 4451 i); | |
| 4452 pss.end_strong_roots(); | |
| 4453 { | |
| 4454 double start = os::elapsedTime(); | |
| 4455 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
| 4456 evac.do_void(); | |
| 4457 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
| 4458 double term_ms = pss.term_time()*1000.0; | |
| 4459 _g1h->g1_policy()->record_obj_copy_time(i, elapsed_ms-term_ms); | |
| 4460 _g1h->g1_policy()->record_termination_time(i, term_ms); | |
| 4461 } | |
| 751 | 4462 if (G1UseSurvivorSpaces) { |
| 545 | 4463 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
| 4464 } | |
| 342 | 4465 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
| 4466 | |
| 4467 // Clean up any par-expanded rem sets. | |
| 4468 HeapRegionRemSet::par_cleanup(); | |
| 4469 | |
| 4470 MutexLocker x(stats_lock()); | |
| 4471 if (ParallelGCVerbose) { | |
| 4472 gclog_or_tty->print("Thread %d complete:\n", i); | |
| 4473 #if G1_DETAILED_STATS | |
| 4474 gclog_or_tty->print(" Pushes: %7d Pops: %7d Overflows: %7d Steals %7d (in %d attempts)\n", | |
| 4475 pss.pushes(), | |
| 4476 pss.pops(), | |
| 4477 pss.overflow_pushes(), | |
| 4478 pss.steals(), | |
| 4479 pss.steal_attempts()); | |
| 4480 #endif | |
| 4481 double elapsed = pss.elapsed(); | |
| 4482 double strong_roots = pss.strong_roots_time(); | |
| 4483 double term = pss.term_time(); | |
| 4484 gclog_or_tty->print(" Elapsed: %7.2f ms.\n" | |
| 4485 " Strong roots: %7.2f ms (%6.2f%%)\n" | |
| 4486 " Termination: %7.2f ms (%6.2f%%) (in %d entries)\n", | |
| 4487 elapsed * 1000.0, | |
| 4488 strong_roots * 1000.0, (strong_roots*100.0/elapsed), | |
| 4489 term * 1000.0, (term*100.0/elapsed), | |
| 4490 pss.term_attempts()); | |
| 4491 size_t total_waste = pss.alloc_buffer_waste() + pss.undo_waste(); | |
| 4492 gclog_or_tty->print(" Waste: %8dK\n" | |
| 4493 " Alloc Buffer: %8dK\n" | |
| 4494 " Undo: %8dK\n", | |
| 4495 (total_waste * HeapWordSize) / K, | |
| 4496 (pss.alloc_buffer_waste() * HeapWordSize) / K, | |
| 4497 (pss.undo_waste() * HeapWordSize) / K); | |
| 4498 } | |
| 4499 | |
| 4500 assert(pss.refs_to_scan() == 0, "Task queue should be empty"); | |
| 4501 assert(pss.overflowed_refs_to_scan() == 0, "Overflow queue should be empty"); | |
| 4502 } | |
| 4503 }; | |
| 4504 | |
| 4505 // *** Common G1 Evacuation Stuff | |
| 4506 | |
| 4507 class G1CountClosure: public OopsInHeapRegionClosure { | |
| 4508 public: | |
| 4509 int n; | |
| 4510 G1CountClosure() : n(0) {} | |
| 4511 void do_oop(narrowOop* p) { | |
| 4512 guarantee(false, "NYI"); | |
| 4513 } | |
| 4514 void do_oop(oop* p) { | |
| 4515 oop obj = *p; | |
| 4516 assert(obj != NULL && G1CollectedHeap::heap()->obj_in_cs(obj), | |
| 4517 "Rem set closure called on non-rem-set pointer."); | |
| 4518 n++; | |
| 4519 } | |
| 4520 }; | |
| 4521 | |
| 4522 static G1CountClosure count_closure; | |
| 4523 | |
| 4524 void | |
| 4525 G1CollectedHeap:: | |
| 4526 g1_process_strong_roots(bool collecting_perm_gen, | |
| 4527 SharedHeap::ScanningOption so, | |
| 4528 OopClosure* scan_non_heap_roots, | |
| 4529 OopsInHeapRegionClosure* scan_rs, | |
| 4530 OopsInHeapRegionClosure* scan_so, | |
| 4531 OopsInGenClosure* scan_perm, | |
| 4532 int worker_i) { | |
| 4533 // First scan the strong roots, including the perm gen. | |
| 4534 double ext_roots_start = os::elapsedTime(); | |
| 4535 double closure_app_time_sec = 0.0; | |
| 4536 | |
| 4537 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
| 4538 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
| 4539 buf_scan_perm.set_generation(perm_gen()); | |
| 4540 | |
| 4541 process_strong_roots(collecting_perm_gen, so, | |
| 4542 &buf_scan_non_heap_roots, | |
| 4543 &buf_scan_perm); | |
| 4544 // Finish up any enqueued closure apps. | |
| 4545 buf_scan_non_heap_roots.done(); | |
| 4546 buf_scan_perm.done(); | |
| 4547 double ext_roots_end = os::elapsedTime(); | |
| 4548 g1_policy()->reset_obj_copy_time(worker_i); | |
| 4549 double obj_copy_time_sec = | |
| 4550 buf_scan_non_heap_roots.closure_app_seconds() + | |
| 4551 buf_scan_perm.closure_app_seconds(); | |
| 4552 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); | |
| 4553 double ext_root_time_ms = | |
| 4554 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
| 4555 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); | |
| 4556 | |
| 4557 // Scan strong roots in mark stack. | |
| 4558 if (!_process_strong_tasks->is_task_claimed(G1H_PS_mark_stack_oops_do)) { | |
| 4559 concurrent_mark()->oops_do(scan_non_heap_roots); | |
| 4560 } | |
| 4561 double mark_stack_scan_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; | |
| 4562 g1_policy()->record_mark_stack_scan_time(worker_i, mark_stack_scan_ms); | |
| 4563 | |
| 4564 // XXX What should this be doing in the parallel case? | |
| 4565 g1_policy()->record_collection_pause_end_CH_strong_roots(); | |
| 4566 if (scan_so != NULL) { | |
| 4567 scan_scan_only_set(scan_so, worker_i); | |
| 4568 } | |
| 4569 // Now scan the complement of the collection set. | |
| 4570 if (scan_rs != NULL) { | |
| 4571 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
| 4572 } | |
| 4573 // Finish with the ref_processor roots. | |
| 4574 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { | |
| 4575 ref_processor()->oops_do(scan_non_heap_roots); | |
| 4576 } | |
| 4577 g1_policy()->record_collection_pause_end_G1_strong_roots(); | |
| 4578 _process_strong_tasks->all_tasks_completed(); | |
| 4579 } | |
| 4580 | |
| 4581 void | |
| 4582 G1CollectedHeap::scan_scan_only_region(HeapRegion* r, | |
| 4583 OopsInHeapRegionClosure* oc, | |
| 4584 int worker_i) { | |
| 4585 HeapWord* startAddr = r->bottom(); | |
| 4586 HeapWord* endAddr = r->used_region().end(); | |
| 4587 | |
| 4588 oc->set_region(r); | |
| 4589 | |
| 4590 HeapWord* p = r->bottom(); | |
| 4591 HeapWord* t = r->top(); | |
| 4592 guarantee( p == r->next_top_at_mark_start(), "invariant" ); | |
| 4593 while (p < t) { | |
| 4594 oop obj = oop(p); | |
| 4595 p += obj->oop_iterate(oc); | |
| 4596 } | |
| 4597 } | |
| 4598 | |
| 4599 void | |
| 4600 G1CollectedHeap::scan_scan_only_set(OopsInHeapRegionClosure* oc, | |
| 4601 int worker_i) { | |
| 4602 double start = os::elapsedTime(); | |
| 4603 | |
| 4604 BufferingOopsInHeapRegionClosure boc(oc); | |
| 4605 | |
| 4606 FilterInHeapRegionAndIntoCSClosure scan_only(this, &boc); | |
| 4607 FilterAndMarkInHeapRegionAndIntoCSClosure scan_and_mark(this, &boc, concurrent_mark()); | |
| 4608 | |
| 4609 OopsInHeapRegionClosure *foc; | |
| 4610 if (g1_policy()->should_initiate_conc_mark()) | |
| 4611 foc = &scan_and_mark; | |
| 4612 else | |
| 4613 foc = &scan_only; | |
| 4614 | |
| 4615 HeapRegion* hr; | |
| 4616 int n = 0; | |
| 4617 while ((hr = _young_list->par_get_next_scan_only_region()) != NULL) { | |
| 4618 scan_scan_only_region(hr, foc, worker_i); | |
| 4619 ++n; | |
| 4620 } | |
| 4621 boc.done(); | |
| 4622 | |
| 4623 double closure_app_s = boc.closure_app_seconds(); | |
| 4624 g1_policy()->record_obj_copy_time(worker_i, closure_app_s * 1000.0); | |
| 4625 double ms = (os::elapsedTime() - start - closure_app_s)*1000.0; | |
| 4626 g1_policy()->record_scan_only_time(worker_i, ms, n); | |
| 4627 } | |
| 4628 | |
| 4629 void | |
| 4630 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
| 4631 OopClosure* non_root_closure) { | |
| 4632 SharedHeap::process_weak_roots(root_closure, non_root_closure); | |
| 4633 } | |
| 4634 | |
| 4635 | |
| 4636 class SaveMarksClosure: public HeapRegionClosure { | |
| 4637 public: | |
| 4638 bool doHeapRegion(HeapRegion* r) { | |
| 4639 r->save_marks(); | |
| 4640 return false; | |
| 4641 } | |
| 4642 }; | |
| 4643 | |
| 4644 void G1CollectedHeap::save_marks() { | |
| 4645 if (ParallelGCThreads == 0) { | |
| 4646 SaveMarksClosure sm; | |
| 4647 heap_region_iterate(&sm); | |
| 4648 } | |
| 4649 // We do this even in the parallel case | |
| 4650 perm_gen()->save_marks(); | |
| 4651 } | |
| 4652 | |
| 4653 void G1CollectedHeap::evacuate_collection_set() { | |
| 4654 set_evacuation_failed(false); | |
| 4655 | |
| 4656 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
| 4657 concurrent_g1_refine()->set_use_cache(false); | |
| 4658 int n_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); | |
| 4659 set_par_threads(n_workers); | |
| 4660 G1ParTask g1_par_task(this, n_workers, _task_queues); | |
| 4661 | |
| 4662 init_for_evac_failure(NULL); | |
| 4663 | |
| 4664 change_strong_roots_parity(); // In preparation for parallel strong roots. | |
| 4665 rem_set()->prepare_for_younger_refs_iterate(true); | |
|
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4666 |
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4667 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
| 342 | 4668 double start_par = os::elapsedTime(); |
| 4669 if (ParallelGCThreads > 0) { | |
| 4670 // The individual threads will set their evac-failure closures. | |
| 4671 workers()->run_task(&g1_par_task); | |
| 4672 } else { | |
| 4673 g1_par_task.work(0); | |
| 4674 } | |
| 4675 | |
| 4676 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
| 4677 g1_policy()->record_par_time(par_time); | |
| 4678 set_par_threads(0); | |
| 4679 // Is this the right thing to do here? We don't save marks | |
| 4680 // on individual heap regions when we allocate from | |
| 4681 // them in parallel, so this seems like the correct place for this. | |
| 545 | 4682 retire_all_alloc_regions(); |
| 342 | 4683 { |
| 4684 G1IsAliveClosure is_alive(this); | |
| 4685 G1KeepAliveClosure keep_alive(this); | |
| 4686 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
| 4687 } | |
| 4688 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); | |
|
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4689 |
| 342 | 4690 concurrent_g1_refine()->set_use_cache(true); |
| 4691 | |
| 4692 finalize_for_evac_failure(); | |
| 4693 | |
| 4694 // Must do this before removing self-forwarding pointers, which clears | |
| 4695 // the per-region evac-failure flags. | |
| 4696 concurrent_mark()->complete_marking_in_collection_set(); | |
| 4697 | |
| 4698 if (evacuation_failed()) { | |
| 4699 remove_self_forwarding_pointers(); | |
| 4700 if (PrintGCDetails) { | |
| 4701 gclog_or_tty->print(" (evacuation failed)"); | |
| 4702 } else if (PrintGC) { | |
| 4703 gclog_or_tty->print("--"); | |
| 4704 } | |
| 4705 } | |
| 4706 | |
|
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4707 if (G1DeferredRSUpdate) { |
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4708 RedirtyLoggedCardTableEntryFastClosure redirty; |
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4709 dirty_card_queue_set().set_closure(&redirty); |
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4710 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
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4711 JavaThread::dirty_card_queue_set().merge_bufferlists(&dirty_card_queue_set()); |
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4712 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
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4713 } |
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4714 |
| 342 | 4715 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
| 4716 } | |
| 4717 | |
| 4718 void G1CollectedHeap::free_region(HeapRegion* hr) { | |
| 4719 size_t pre_used = 0; | |
| 4720 size_t cleared_h_regions = 0; | |
| 4721 size_t freed_regions = 0; | |
| 4722 UncleanRegionList local_list; | |
| 4723 | |
| 4724 HeapWord* start = hr->bottom(); | |
| 4725 HeapWord* end = hr->prev_top_at_mark_start(); | |
| 4726 size_t used_bytes = hr->used(); | |
| 4727 size_t live_bytes = hr->max_live_bytes(); | |
| 4728 if (used_bytes > 0) { | |
| 4729 guarantee( live_bytes <= used_bytes, "invariant" ); | |
| 4730 } else { | |
| 4731 guarantee( live_bytes == 0, "invariant" ); | |
| 4732 } | |
| 4733 | |
| 4734 size_t garbage_bytes = used_bytes - live_bytes; | |
| 4735 if (garbage_bytes > 0) | |
| 4736 g1_policy()->decrease_known_garbage_bytes(garbage_bytes); | |
| 4737 | |
| 4738 free_region_work(hr, pre_used, cleared_h_regions, freed_regions, | |
| 4739 &local_list); | |
| 4740 finish_free_region_work(pre_used, cleared_h_regions, freed_regions, | |
| 4741 &local_list); | |
| 4742 } | |
| 4743 | |
| 4744 void | |
| 4745 G1CollectedHeap::free_region_work(HeapRegion* hr, | |
| 4746 size_t& pre_used, | |
| 4747 size_t& cleared_h_regions, | |
| 4748 size_t& freed_regions, | |
| 4749 UncleanRegionList* list, | |
| 4750 bool par) { | |
| 4751 pre_used += hr->used(); | |
| 4752 if (hr->isHumongous()) { | |
| 4753 assert(hr->startsHumongous(), | |
| 4754 "Only the start of a humongous region should be freed."); | |
| 4755 int ind = _hrs->find(hr); | |
| 4756 assert(ind != -1, "Should have an index."); | |
| 4757 // Clear the start region. | |
| 4758 hr->hr_clear(par, true /*clear_space*/); | |
| 4759 list->insert_before_head(hr); | |
| 4760 cleared_h_regions++; | |
| 4761 freed_regions++; | |
| 4762 // Clear any continued regions. | |
| 4763 ind++; | |
| 4764 while ((size_t)ind < n_regions()) { | |
| 4765 HeapRegion* hrc = _hrs->at(ind); | |
| 4766 if (!hrc->continuesHumongous()) break; | |
| 4767 // Otherwise, does continue the H region. | |
| 4768 assert(hrc->humongous_start_region() == hr, "Huh?"); | |
| 4769 hrc->hr_clear(par, true /*clear_space*/); | |
| 4770 cleared_h_regions++; | |
| 4771 freed_regions++; | |
| 4772 list->insert_before_head(hrc); | |
| 4773 ind++; | |
| 4774 } | |
| 4775 } else { | |
| 4776 hr->hr_clear(par, true /*clear_space*/); | |
| 4777 list->insert_before_head(hr); | |
| 4778 freed_regions++; | |
| 4779 // If we're using clear2, this should not be enabled. | |
| 4780 // assert(!hr->in_cohort(), "Can't be both free and in a cohort."); | |
| 4781 } | |
| 4782 } | |
| 4783 | |
| 4784 void G1CollectedHeap::finish_free_region_work(size_t pre_used, | |
| 4785 size_t cleared_h_regions, | |
| 4786 size_t freed_regions, | |
| 4787 UncleanRegionList* list) { | |
| 4788 if (list != NULL && list->sz() > 0) { | |
| 4789 prepend_region_list_on_unclean_list(list); | |
| 4790 } | |
| 4791 // Acquire a lock, if we're parallel, to update possibly-shared | |
| 4792 // variables. | |
| 4793 Mutex* lock = (n_par_threads() > 0) ? ParGCRareEvent_lock : NULL; | |
| 4794 { | |
| 4795 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); | |
| 4796 _summary_bytes_used -= pre_used; | |
| 4797 _num_humongous_regions -= (int) cleared_h_regions; | |
| 4798 _free_regions += freed_regions; | |
| 4799 } | |
| 4800 } | |
| 4801 | |
| 4802 | |
| 4803 void G1CollectedHeap::dirtyCardsForYoungRegions(CardTableModRefBS* ct_bs, HeapRegion* list) { | |
| 4804 while (list != NULL) { | |
| 4805 guarantee( list->is_young(), "invariant" ); | |
| 4806 | |
| 4807 HeapWord* bottom = list->bottom(); | |
| 4808 HeapWord* end = list->end(); | |
| 4809 MemRegion mr(bottom, end); | |
| 4810 ct_bs->dirty(mr); | |
| 4811 | |
| 4812 list = list->get_next_young_region(); | |
| 4813 } | |
| 4814 } | |
| 4815 | |
|
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4816 |
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4817 class G1ParCleanupCTTask : public AbstractGangTask { |
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4818 CardTableModRefBS* _ct_bs; |
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4819 G1CollectedHeap* _g1h; |
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4820 public: |
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4821 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
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4822 G1CollectedHeap* g1h) : |
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4823 AbstractGangTask("G1 Par Cleanup CT Task"), |
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4824 _ct_bs(ct_bs), |
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4825 _g1h(g1h) |
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4826 { } |
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4827 |
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4828 void work(int i) { |
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4829 HeapRegion* r; |
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4830 while (r = _g1h->pop_dirty_cards_region()) { |
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4831 clear_cards(r); |
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4832 } |
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4833 } |
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4834 void clear_cards(HeapRegion* r) { |
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4835 // Cards for Survivor and Scan-Only regions will be dirtied later. |
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4836 if (!r->is_scan_only() && !r->is_survivor()) { |
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4837 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
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4838 } |
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4839 } |
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4840 }; |
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4841 |
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4842 |
| 342 | 4843 void G1CollectedHeap::cleanUpCardTable() { |
| 4844 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
| 4845 double start = os::elapsedTime(); | |
| 4846 | |
|
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4847 // Iterate over the dirty cards region list. |
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4848 G1ParCleanupCTTask cleanup_task(ct_bs, this); |
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4849 if (ParallelGCThreads > 0) { |
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4850 set_par_threads(workers()->total_workers()); |
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4851 workers()->run_task(&cleanup_task); |
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4852 set_par_threads(0); |
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4853 } else { |
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4854 while (_dirty_cards_region_list) { |
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4855 HeapRegion* r = _dirty_cards_region_list; |
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4856 cleanup_task.clear_cards(r); |
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4857 _dirty_cards_region_list = r->get_next_dirty_cards_region(); |
|
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6819065: G1: eliminate high serial card table clearing time
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diff
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|
4858 if (_dirty_cards_region_list == r) { |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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parents:
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changeset
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4859 // The last region. |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
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diff
changeset
|
4860 _dirty_cards_region_list = NULL; |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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parents:
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|
4861 } |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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4862 r->set_next_dirty_cards_region(NULL); |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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parents:
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4863 } |
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6819065: G1: eliminate high serial card table clearing time
apetrusenko
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diff
changeset
|
4864 } |
| 342 | 4865 // now, redirty the cards of the scan-only and survivor regions |
| 4866 // (it seemed faster to do it this way, instead of iterating over | |
|
796
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6819065: G1: eliminate high serial card table clearing time
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diff
changeset
|
4867 // all regions and then clearing / dirtying as appropriate) |
| 342 | 4868 dirtyCardsForYoungRegions(ct_bs, _young_list->first_scan_only_region()); |
| 4869 dirtyCardsForYoungRegions(ct_bs, _young_list->first_survivor_region()); | |
| 4870 | |
| 4871 double elapsed = os::elapsedTime() - start; | |
| 4872 g1_policy()->record_clear_ct_time( elapsed * 1000.0); | |
| 4873 } | |
| 4874 | |
| 4875 | |
| 4876 void G1CollectedHeap::do_collection_pause_if_appropriate(size_t word_size) { | |
| 4877 if (g1_policy()->should_do_collection_pause(word_size)) { | |
| 4878 do_collection_pause(); | |
| 4879 } | |
| 4880 } | |
| 4881 | |
| 4882 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
| 4883 double young_time_ms = 0.0; | |
| 4884 double non_young_time_ms = 0.0; | |
| 4885 | |
| 4886 G1CollectorPolicy* policy = g1_policy(); | |
| 4887 | |
| 4888 double start_sec = os::elapsedTime(); | |
| 4889 bool non_young = true; | |
| 4890 | |
| 4891 HeapRegion* cur = cs_head; | |
| 4892 int age_bound = -1; | |
| 4893 size_t rs_lengths = 0; | |
| 4894 | |
| 4895 while (cur != NULL) { | |
| 4896 if (non_young) { | |
| 4897 if (cur->is_young()) { | |
| 4898 double end_sec = os::elapsedTime(); | |
| 4899 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 4900 non_young_time_ms += elapsed_ms; | |
| 4901 | |
| 4902 start_sec = os::elapsedTime(); | |
| 4903 non_young = false; | |
| 4904 } | |
| 4905 } else { | |
| 4906 if (!cur->is_on_free_list()) { | |
| 4907 double end_sec = os::elapsedTime(); | |
| 4908 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 4909 young_time_ms += elapsed_ms; | |
| 4910 | |
| 4911 start_sec = os::elapsedTime(); | |
| 4912 non_young = true; | |
| 4913 } | |
| 4914 } | |
| 4915 | |
| 4916 rs_lengths += cur->rem_set()->occupied(); | |
| 4917 | |
| 4918 HeapRegion* next = cur->next_in_collection_set(); | |
| 4919 assert(cur->in_collection_set(), "bad CS"); | |
| 4920 cur->set_next_in_collection_set(NULL); | |
| 4921 cur->set_in_collection_set(false); | |
| 4922 | |
| 4923 if (cur->is_young()) { | |
| 4924 int index = cur->young_index_in_cset(); | |
| 4925 guarantee( index != -1, "invariant" ); | |
| 4926 guarantee( (size_t)index < policy->young_cset_length(), "invariant" ); | |
| 4927 size_t words_survived = _surviving_young_words[index]; | |
| 4928 cur->record_surv_words_in_group(words_survived); | |
| 4929 } else { | |
| 4930 int index = cur->young_index_in_cset(); | |
| 4931 guarantee( index == -1, "invariant" ); | |
| 4932 } | |
| 4933 | |
| 4934 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
| 4935 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
| 4936 "invariant" ); | |
| 4937 | |
| 4938 if (!cur->evacuation_failed()) { | |
| 4939 // And the region is empty. | |
| 4940 assert(!cur->is_empty(), | |
| 4941 "Should not have empty regions in a CS."); | |
| 4942 free_region(cur); | |
| 4943 } else { | |
| 4944 guarantee( !cur->is_scan_only(), "should not be scan only" ); | |
| 4945 cur->uninstall_surv_rate_group(); | |
| 4946 if (cur->is_young()) | |
| 4947 cur->set_young_index_in_cset(-1); | |
| 4948 cur->set_not_young(); | |
| 4949 cur->set_evacuation_failed(false); | |
| 4950 } | |
| 4951 cur = next; | |
| 4952 } | |
| 4953 | |
| 4954 policy->record_max_rs_lengths(rs_lengths); | |
| 4955 policy->cset_regions_freed(); | |
| 4956 | |
| 4957 double end_sec = os::elapsedTime(); | |
| 4958 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 4959 if (non_young) | |
| 4960 non_young_time_ms += elapsed_ms; | |
| 4961 else | |
| 4962 young_time_ms += elapsed_ms; | |
| 4963 | |
| 4964 policy->record_young_free_cset_time_ms(young_time_ms); | |
| 4965 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
| 4966 } | |
| 4967 | |
| 4968 HeapRegion* | |
| 4969 G1CollectedHeap::alloc_region_from_unclean_list_locked(bool zero_filled) { | |
| 4970 assert(ZF_mon->owned_by_self(), "Precondition"); | |
| 4971 HeapRegion* res = pop_unclean_region_list_locked(); | |
| 4972 if (res != NULL) { | |
| 4973 assert(!res->continuesHumongous() && | |
| 4974 res->zero_fill_state() != HeapRegion::Allocated, | |
| 4975 "Only free regions on unclean list."); | |
| 4976 if (zero_filled) { | |
| 4977 res->ensure_zero_filled_locked(); | |
| 4978 res->set_zero_fill_allocated(); | |
| 4979 } | |
| 4980 } | |
| 4981 return res; | |
| 4982 } | |
| 4983 | |
| 4984 HeapRegion* G1CollectedHeap::alloc_region_from_unclean_list(bool zero_filled) { | |
| 4985 MutexLockerEx zx(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4986 return alloc_region_from_unclean_list_locked(zero_filled); | |
| 4987 } | |
| 4988 | |
| 4989 void G1CollectedHeap::put_region_on_unclean_list(HeapRegion* r) { | |
| 4990 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4991 put_region_on_unclean_list_locked(r); | |
| 4992 if (should_zf()) ZF_mon->notify_all(); // Wake up ZF thread. | |
| 4993 } | |
| 4994 | |
| 4995 void G1CollectedHeap::set_unclean_regions_coming(bool b) { | |
| 4996 MutexLockerEx x(Cleanup_mon); | |
| 4997 set_unclean_regions_coming_locked(b); | |
| 4998 } | |
| 4999 | |
| 5000 void G1CollectedHeap::set_unclean_regions_coming_locked(bool b) { | |
| 5001 assert(Cleanup_mon->owned_by_self(), "Precondition"); | |
| 5002 _unclean_regions_coming = b; | |
| 5003 // Wake up mutator threads that might be waiting for completeCleanup to | |
| 5004 // finish. | |
| 5005 if (!b) Cleanup_mon->notify_all(); | |
| 5006 } | |
| 5007 | |
| 5008 void G1CollectedHeap::wait_for_cleanup_complete() { | |
| 5009 MutexLockerEx x(Cleanup_mon); | |
| 5010 wait_for_cleanup_complete_locked(); | |
| 5011 } | |
| 5012 | |
| 5013 void G1CollectedHeap::wait_for_cleanup_complete_locked() { | |
| 5014 assert(Cleanup_mon->owned_by_self(), "precondition"); | |
| 5015 while (_unclean_regions_coming) { | |
| 5016 Cleanup_mon->wait(); | |
| 5017 } | |
| 5018 } | |
| 5019 | |
| 5020 void | |
| 5021 G1CollectedHeap::put_region_on_unclean_list_locked(HeapRegion* r) { | |
| 5022 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 5023 _unclean_region_list.insert_before_head(r); | |
| 5024 } | |
| 5025 | |
| 5026 void | |
| 5027 G1CollectedHeap::prepend_region_list_on_unclean_list(UncleanRegionList* list) { | |
| 5028 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5029 prepend_region_list_on_unclean_list_locked(list); | |
| 5030 if (should_zf()) ZF_mon->notify_all(); // Wake up ZF thread. | |
| 5031 } | |
| 5032 | |
| 5033 void | |
| 5034 G1CollectedHeap:: | |
| 5035 prepend_region_list_on_unclean_list_locked(UncleanRegionList* list) { | |
| 5036 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 5037 _unclean_region_list.prepend_list(list); | |
| 5038 } | |
| 5039 | |
| 5040 HeapRegion* G1CollectedHeap::pop_unclean_region_list_locked() { | |
| 5041 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 5042 HeapRegion* res = _unclean_region_list.pop(); | |
| 5043 if (res != NULL) { | |
| 5044 // Inform ZF thread that there's a new unclean head. | |
| 5045 if (_unclean_region_list.hd() != NULL && should_zf()) | |
| 5046 ZF_mon->notify_all(); | |
| 5047 } | |
| 5048 return res; | |
| 5049 } | |
| 5050 | |
| 5051 HeapRegion* G1CollectedHeap::peek_unclean_region_list_locked() { | |
| 5052 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 5053 return _unclean_region_list.hd(); | |
| 5054 } | |
| 5055 | |
| 5056 | |
| 5057 bool G1CollectedHeap::move_cleaned_region_to_free_list_locked() { | |
| 5058 assert(ZF_mon->owned_by_self(), "Precondition"); | |
| 5059 HeapRegion* r = peek_unclean_region_list_locked(); | |
| 5060 if (r != NULL && r->zero_fill_state() == HeapRegion::ZeroFilled) { | |
| 5061 // Result of below must be equal to "r", since we hold the lock. | |
| 5062 (void)pop_unclean_region_list_locked(); | |
| 5063 put_free_region_on_list_locked(r); | |
| 5064 return true; | |
| 5065 } else { | |
| 5066 return false; | |
| 5067 } | |
| 5068 } | |
| 5069 | |
| 5070 bool G1CollectedHeap::move_cleaned_region_to_free_list() { | |
| 5071 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5072 return move_cleaned_region_to_free_list_locked(); | |
| 5073 } | |
| 5074 | |
| 5075 | |
| 5076 void G1CollectedHeap::put_free_region_on_list_locked(HeapRegion* r) { | |
| 5077 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 5078 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 5079 assert(r->zero_fill_state() == HeapRegion::ZeroFilled, | |
| 5080 "Regions on free list must be zero filled"); | |
| 5081 assert(!r->isHumongous(), "Must not be humongous."); | |
| 5082 assert(r->is_empty(), "Better be empty"); | |
| 5083 assert(!r->is_on_free_list(), | |
| 5084 "Better not already be on free list"); | |
| 5085 assert(!r->is_on_unclean_list(), | |
| 5086 "Better not already be on unclean list"); | |
| 5087 r->set_on_free_list(true); | |
| 5088 r->set_next_on_free_list(_free_region_list); | |
| 5089 _free_region_list = r; | |
| 5090 _free_region_list_size++; | |
| 5091 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 5092 } | |
| 5093 | |
| 5094 void G1CollectedHeap::put_free_region_on_list(HeapRegion* r) { | |
| 5095 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5096 put_free_region_on_list_locked(r); | |
| 5097 } | |
| 5098 | |
| 5099 HeapRegion* G1CollectedHeap::pop_free_region_list_locked() { | |
| 5100 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 5101 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 5102 HeapRegion* res = _free_region_list; | |
| 5103 if (res != NULL) { | |
| 5104 _free_region_list = res->next_from_free_list(); | |
| 5105 _free_region_list_size--; | |
| 5106 res->set_on_free_list(false); | |
| 5107 res->set_next_on_free_list(NULL); | |
| 5108 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 5109 } | |
| 5110 return res; | |
| 5111 } | |
| 5112 | |
| 5113 | |
| 5114 HeapRegion* G1CollectedHeap::alloc_free_region_from_lists(bool zero_filled) { | |
| 5115 // By self, or on behalf of self. | |
| 5116 assert(Heap_lock->is_locked(), "Precondition"); | |
| 5117 HeapRegion* res = NULL; | |
| 5118 bool first = true; | |
| 5119 while (res == NULL) { | |
| 5120 if (zero_filled || !first) { | |
| 5121 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5122 res = pop_free_region_list_locked(); | |
| 5123 if (res != NULL) { | |
| 5124 assert(!res->zero_fill_is_allocated(), | |
| 5125 "No allocated regions on free list."); | |
| 5126 res->set_zero_fill_allocated(); | |
| 5127 } else if (!first) { | |
| 5128 break; // We tried both, time to return NULL. | |
| 5129 } | |
| 5130 } | |
| 5131 | |
| 5132 if (res == NULL) { | |
| 5133 res = alloc_region_from_unclean_list(zero_filled); | |
| 5134 } | |
| 5135 assert(res == NULL || | |
| 5136 !zero_filled || | |
| 5137 res->zero_fill_is_allocated(), | |
| 5138 "We must have allocated the region we're returning"); | |
| 5139 first = false; | |
| 5140 } | |
| 5141 return res; | |
| 5142 } | |
| 5143 | |
| 5144 void G1CollectedHeap::remove_allocated_regions_from_lists() { | |
| 5145 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5146 { | |
| 5147 HeapRegion* prev = NULL; | |
| 5148 HeapRegion* cur = _unclean_region_list.hd(); | |
| 5149 while (cur != NULL) { | |
| 5150 HeapRegion* next = cur->next_from_unclean_list(); | |
| 5151 if (cur->zero_fill_is_allocated()) { | |
| 5152 // Remove from the list. | |
| 5153 if (prev == NULL) { | |
| 5154 (void)_unclean_region_list.pop(); | |
| 5155 } else { | |
| 5156 _unclean_region_list.delete_after(prev); | |
| 5157 } | |
| 5158 cur->set_on_unclean_list(false); | |
| 5159 cur->set_next_on_unclean_list(NULL); | |
| 5160 } else { | |
| 5161 prev = cur; | |
| 5162 } | |
| 5163 cur = next; | |
| 5164 } | |
| 5165 assert(_unclean_region_list.sz() == unclean_region_list_length(), | |
| 5166 "Inv"); | |
| 5167 } | |
| 5168 | |
| 5169 { | |
| 5170 HeapRegion* prev = NULL; | |
| 5171 HeapRegion* cur = _free_region_list; | |
| 5172 while (cur != NULL) { | |
| 5173 HeapRegion* next = cur->next_from_free_list(); | |
| 5174 if (cur->zero_fill_is_allocated()) { | |
| 5175 // Remove from the list. | |
| 5176 if (prev == NULL) { | |
| 5177 _free_region_list = cur->next_from_free_list(); | |
| 5178 } else { | |
| 5179 prev->set_next_on_free_list(cur->next_from_free_list()); | |
| 5180 } | |
| 5181 cur->set_on_free_list(false); | |
| 5182 cur->set_next_on_free_list(NULL); | |
| 5183 _free_region_list_size--; | |
| 5184 } else { | |
| 5185 prev = cur; | |
| 5186 } | |
| 5187 cur = next; | |
| 5188 } | |
| 5189 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 5190 } | |
| 5191 } | |
| 5192 | |
| 5193 bool G1CollectedHeap::verify_region_lists() { | |
| 5194 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5195 return verify_region_lists_locked(); | |
| 5196 } | |
| 5197 | |
| 5198 bool G1CollectedHeap::verify_region_lists_locked() { | |
| 5199 HeapRegion* unclean = _unclean_region_list.hd(); | |
| 5200 while (unclean != NULL) { | |
| 5201 guarantee(unclean->is_on_unclean_list(), "Well, it is!"); | |
| 5202 guarantee(!unclean->is_on_free_list(), "Well, it shouldn't be!"); | |
| 5203 guarantee(unclean->zero_fill_state() != HeapRegion::Allocated, | |
| 5204 "Everything else is possible."); | |
| 5205 unclean = unclean->next_from_unclean_list(); | |
| 5206 } | |
| 5207 guarantee(_unclean_region_list.sz() == unclean_region_list_length(), "Inv"); | |
| 5208 | |
| 5209 HeapRegion* free_r = _free_region_list; | |
| 5210 while (free_r != NULL) { | |
| 5211 assert(free_r->is_on_free_list(), "Well, it is!"); | |
| 5212 assert(!free_r->is_on_unclean_list(), "Well, it shouldn't be!"); | |
| 5213 switch (free_r->zero_fill_state()) { | |
| 5214 case HeapRegion::NotZeroFilled: | |
| 5215 case HeapRegion::ZeroFilling: | |
| 5216 guarantee(false, "Should not be on free list."); | |
| 5217 break; | |
| 5218 default: | |
| 5219 // Everything else is possible. | |
| 5220 break; | |
| 5221 } | |
| 5222 free_r = free_r->next_from_free_list(); | |
| 5223 } | |
| 5224 guarantee(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 5225 // If we didn't do an assertion... | |
| 5226 return true; | |
| 5227 } | |
| 5228 | |
| 5229 size_t G1CollectedHeap::free_region_list_length() { | |
| 5230 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 5231 size_t len = 0; | |
| 5232 HeapRegion* cur = _free_region_list; | |
| 5233 while (cur != NULL) { | |
| 5234 len++; | |
| 5235 cur = cur->next_from_free_list(); | |
| 5236 } | |
| 5237 return len; | |
| 5238 } | |
| 5239 | |
| 5240 size_t G1CollectedHeap::unclean_region_list_length() { | |
| 5241 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 5242 return _unclean_region_list.length(); | |
| 5243 } | |
| 5244 | |
| 5245 size_t G1CollectedHeap::n_regions() { | |
| 5246 return _hrs->length(); | |
| 5247 } | |
| 5248 | |
| 5249 size_t G1CollectedHeap::max_regions() { | |
| 5250 return | |
| 5251 (size_t)align_size_up(g1_reserved_obj_bytes(), HeapRegion::GrainBytes) / | |
| 5252 HeapRegion::GrainBytes; | |
| 5253 } | |
| 5254 | |
| 5255 size_t G1CollectedHeap::free_regions() { | |
| 5256 /* Possibly-expensive assert. | |
| 5257 assert(_free_regions == count_free_regions(), | |
| 5258 "_free_regions is off."); | |
| 5259 */ | |
| 5260 return _free_regions; | |
| 5261 } | |
| 5262 | |
| 5263 bool G1CollectedHeap::should_zf() { | |
| 5264 return _free_region_list_size < (size_t) G1ConcZFMaxRegions; | |
| 5265 } | |
| 5266 | |
| 5267 class RegionCounter: public HeapRegionClosure { | |
| 5268 size_t _n; | |
| 5269 public: | |
| 5270 RegionCounter() : _n(0) {} | |
| 5271 bool doHeapRegion(HeapRegion* r) { | |
| 677 | 5272 if (r->is_empty()) { |
| 342 | 5273 assert(!r->isHumongous(), "H regions should not be empty."); |
| 5274 _n++; | |
| 5275 } | |
| 5276 return false; | |
| 5277 } | |
| 5278 int res() { return (int) _n; } | |
| 5279 }; | |
| 5280 | |
| 5281 size_t G1CollectedHeap::count_free_regions() { | |
| 5282 RegionCounter rc; | |
| 5283 heap_region_iterate(&rc); | |
| 5284 size_t n = rc.res(); | |
| 5285 if (_cur_alloc_region != NULL && _cur_alloc_region->is_empty()) | |
| 5286 n--; | |
| 5287 return n; | |
| 5288 } | |
| 5289 | |
| 5290 size_t G1CollectedHeap::count_free_regions_list() { | |
| 5291 size_t n = 0; | |
| 5292 size_t o = 0; | |
| 5293 ZF_mon->lock_without_safepoint_check(); | |
| 5294 HeapRegion* cur = _free_region_list; | |
| 5295 while (cur != NULL) { | |
| 5296 cur = cur->next_from_free_list(); | |
| 5297 n++; | |
| 5298 } | |
| 5299 size_t m = unclean_region_list_length(); | |
| 5300 ZF_mon->unlock(); | |
| 5301 return n + m; | |
| 5302 } | |
| 5303 | |
| 5304 bool G1CollectedHeap::should_set_young_locked() { | |
| 5305 assert(heap_lock_held_for_gc(), | |
| 5306 "the heap lock should already be held by or for this thread"); | |
| 5307 return (g1_policy()->in_young_gc_mode() && | |
| 5308 g1_policy()->should_add_next_region_to_young_list()); | |
| 5309 } | |
| 5310 | |
| 5311 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
| 5312 assert(heap_lock_held_for_gc(), | |
| 5313 "the heap lock should already be held by or for this thread"); | |
| 5314 _young_list->push_region(hr); | |
| 5315 g1_policy()->set_region_short_lived(hr); | |
| 5316 } | |
| 5317 | |
| 5318 class NoYoungRegionsClosure: public HeapRegionClosure { | |
| 5319 private: | |
| 5320 bool _success; | |
| 5321 public: | |
| 5322 NoYoungRegionsClosure() : _success(true) { } | |
| 5323 bool doHeapRegion(HeapRegion* r) { | |
| 5324 if (r->is_young()) { | |
| 5325 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
| 5326 r->bottom(), r->end()); | |
| 5327 _success = false; | |
| 5328 } | |
| 5329 return false; | |
| 5330 } | |
| 5331 bool success() { return _success; } | |
| 5332 }; | |
| 5333 | |
| 5334 bool G1CollectedHeap::check_young_list_empty(bool ignore_scan_only_list, | |
| 5335 bool check_sample) { | |
| 5336 bool ret = true; | |
| 5337 | |
| 5338 ret = _young_list->check_list_empty(ignore_scan_only_list, check_sample); | |
| 5339 if (!ignore_scan_only_list) { | |
| 5340 NoYoungRegionsClosure closure; | |
| 5341 heap_region_iterate(&closure); | |
| 5342 ret = ret && closure.success(); | |
| 5343 } | |
| 5344 | |
| 5345 return ret; | |
| 5346 } | |
| 5347 | |
| 5348 void G1CollectedHeap::empty_young_list() { | |
| 5349 assert(heap_lock_held_for_gc(), | |
| 5350 "the heap lock should already be held by or for this thread"); | |
| 5351 assert(g1_policy()->in_young_gc_mode(), "should be in young GC mode"); | |
| 5352 | |
| 5353 _young_list->empty_list(); | |
| 5354 } | |
| 5355 | |
| 5356 bool G1CollectedHeap::all_alloc_regions_no_allocs_since_save_marks() { | |
| 5357 bool no_allocs = true; | |
| 5358 for (int ap = 0; ap < GCAllocPurposeCount && no_allocs; ++ap) { | |
| 5359 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 5360 no_allocs = r == NULL || r->saved_mark_at_top(); | |
| 5361 } | |
| 5362 return no_allocs; | |
| 5363 } | |
| 5364 | |
| 545 | 5365 void G1CollectedHeap::retire_all_alloc_regions() { |
| 342 | 5366 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
| 5367 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 5368 if (r != NULL) { | |
| 5369 // Check for aliases. | |
| 5370 bool has_processed_alias = false; | |
| 5371 for (int i = 0; i < ap; ++i) { | |
| 5372 if (_gc_alloc_regions[i] == r) { | |
| 5373 has_processed_alias = true; | |
| 5374 break; | |
| 5375 } | |
| 5376 } | |
| 5377 if (!has_processed_alias) { | |
| 545 | 5378 retire_alloc_region(r, false /* par */); |
| 342 | 5379 } |
| 5380 } | |
| 5381 } | |
| 5382 } | |
| 5383 | |
| 5384 | |
| 5385 // Done at the start of full GC. | |
| 5386 void G1CollectedHeap::tear_down_region_lists() { | |
| 5387 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5388 while (pop_unclean_region_list_locked() != NULL) ; | |
| 5389 assert(_unclean_region_list.hd() == NULL && _unclean_region_list.sz() == 0, | |
| 5390 "Postconditions of loop.") | |
| 5391 while (pop_free_region_list_locked() != NULL) ; | |
| 5392 assert(_free_region_list == NULL, "Postcondition of loop."); | |
| 5393 if (_free_region_list_size != 0) { | |
| 5394 gclog_or_tty->print_cr("Size is %d.", _free_region_list_size); | |
|
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|
5395 print_on(gclog_or_tty, true /* extended */); |
| 342 | 5396 } |
| 5397 assert(_free_region_list_size == 0, "Postconditions of loop."); | |
| 5398 } | |
| 5399 | |
| 5400 | |
| 5401 class RegionResetter: public HeapRegionClosure { | |
| 5402 G1CollectedHeap* _g1; | |
| 5403 int _n; | |
| 5404 public: | |
| 5405 RegionResetter() : _g1(G1CollectedHeap::heap()), _n(0) {} | |
| 5406 bool doHeapRegion(HeapRegion* r) { | |
| 5407 if (r->continuesHumongous()) return false; | |
| 5408 if (r->top() > r->bottom()) { | |
| 5409 if (r->top() < r->end()) { | |
| 5410 Copy::fill_to_words(r->top(), | |
| 5411 pointer_delta(r->end(), r->top())); | |
| 5412 } | |
| 5413 r->set_zero_fill_allocated(); | |
| 5414 } else { | |
| 5415 assert(r->is_empty(), "tautology"); | |
| 677 | 5416 _n++; |
| 5417 switch (r->zero_fill_state()) { | |
| 342 | 5418 case HeapRegion::NotZeroFilled: |
| 5419 case HeapRegion::ZeroFilling: | |
| 5420 _g1->put_region_on_unclean_list_locked(r); | |
| 5421 break; | |
| 5422 case HeapRegion::Allocated: | |
| 5423 r->set_zero_fill_complete(); | |
| 5424 // no break; go on to put on free list. | |
| 5425 case HeapRegion::ZeroFilled: | |
| 5426 _g1->put_free_region_on_list_locked(r); | |
| 5427 break; | |
| 5428 } | |
| 5429 } | |
| 5430 return false; | |
| 5431 } | |
| 5432 | |
| 5433 int getFreeRegionCount() {return _n;} | |
| 5434 }; | |
| 5435 | |
| 5436 // Done at the end of full GC. | |
| 5437 void G1CollectedHeap::rebuild_region_lists() { | |
| 5438 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5439 // This needs to go at the end of the full GC. | |
| 5440 RegionResetter rs; | |
| 5441 heap_region_iterate(&rs); | |
| 5442 _free_regions = rs.getFreeRegionCount(); | |
| 5443 // Tell the ZF thread it may have work to do. | |
| 5444 if (should_zf()) ZF_mon->notify_all(); | |
| 5445 } | |
| 5446 | |
| 5447 class UsedRegionsNeedZeroFillSetter: public HeapRegionClosure { | |
| 5448 G1CollectedHeap* _g1; | |
| 5449 int _n; | |
| 5450 public: | |
| 5451 UsedRegionsNeedZeroFillSetter() : _g1(G1CollectedHeap::heap()), _n(0) {} | |
| 5452 bool doHeapRegion(HeapRegion* r) { | |
| 5453 if (r->continuesHumongous()) return false; | |
| 5454 if (r->top() > r->bottom()) { | |
| 5455 // There are assertions in "set_zero_fill_needed()" below that | |
| 5456 // require top() == bottom(), so this is technically illegal. | |
| 5457 // We'll skirt the law here, by making that true temporarily. | |
| 5458 DEBUG_ONLY(HeapWord* save_top = r->top(); | |
| 5459 r->set_top(r->bottom())); | |
| 5460 r->set_zero_fill_needed(); | |
| 5461 DEBUG_ONLY(r->set_top(save_top)); | |
| 5462 } | |
| 5463 return false; | |
| 5464 } | |
| 5465 }; | |
| 5466 | |
| 5467 // Done at the start of full GC. | |
| 5468 void G1CollectedHeap::set_used_regions_to_need_zero_fill() { | |
| 5469 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5470 // This needs to go at the end of the full GC. | |
| 5471 UsedRegionsNeedZeroFillSetter rs; | |
| 5472 heap_region_iterate(&rs); | |
| 5473 } | |
| 5474 | |
| 5475 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
| 5476 _refine_cte_cl->set_concurrent(concurrent); | |
| 5477 } | |
| 5478 | |
| 5479 #ifndef PRODUCT | |
| 5480 | |
| 5481 class PrintHeapRegionClosure: public HeapRegionClosure { | |
| 5482 public: | |
| 5483 bool doHeapRegion(HeapRegion *r) { | |
| 5484 gclog_or_tty->print("Region: "PTR_FORMAT":", r); | |
| 5485 if (r != NULL) { | |
| 5486 if (r->is_on_free_list()) | |
| 5487 gclog_or_tty->print("Free "); | |
| 5488 if (r->is_young()) | |
| 5489 gclog_or_tty->print("Young "); | |
| 5490 if (r->isHumongous()) | |
| 5491 gclog_or_tty->print("Is Humongous "); | |
| 5492 r->print(); | |
| 5493 } | |
| 5494 return false; | |
| 5495 } | |
| 5496 }; | |
| 5497 | |
| 5498 class SortHeapRegionClosure : public HeapRegionClosure { | |
| 5499 size_t young_regions,free_regions, unclean_regions; | |
| 5500 size_t hum_regions, count; | |
| 5501 size_t unaccounted, cur_unclean, cur_alloc; | |
| 5502 size_t total_free; | |
| 5503 HeapRegion* cur; | |
| 5504 public: | |
| 5505 SortHeapRegionClosure(HeapRegion *_cur) : cur(_cur), young_regions(0), | |
| 5506 free_regions(0), unclean_regions(0), | |
| 5507 hum_regions(0), | |
| 5508 count(0), unaccounted(0), | |
| 5509 cur_alloc(0), total_free(0) | |
| 5510 {} | |
| 5511 bool doHeapRegion(HeapRegion *r) { | |
| 5512 count++; | |
| 5513 if (r->is_on_free_list()) free_regions++; | |
| 5514 else if (r->is_on_unclean_list()) unclean_regions++; | |
| 5515 else if (r->isHumongous()) hum_regions++; | |
| 5516 else if (r->is_young()) young_regions++; | |
| 5517 else if (r == cur) cur_alloc++; | |
| 5518 else unaccounted++; | |
| 5519 return false; | |
| 5520 } | |
| 5521 void print() { | |
| 5522 total_free = free_regions + unclean_regions; | |
| 5523 gclog_or_tty->print("%d regions\n", count); | |
| 5524 gclog_or_tty->print("%d free: free_list = %d unclean = %d\n", | |
| 5525 total_free, free_regions, unclean_regions); | |
| 5526 gclog_or_tty->print("%d humongous %d young\n", | |
| 5527 hum_regions, young_regions); | |
| 5528 gclog_or_tty->print("%d cur_alloc\n", cur_alloc); | |
| 5529 gclog_or_tty->print("UHOH unaccounted = %d\n", unaccounted); | |
| 5530 } | |
| 5531 }; | |
| 5532 | |
| 5533 void G1CollectedHeap::print_region_counts() { | |
| 5534 SortHeapRegionClosure sc(_cur_alloc_region); | |
| 5535 PrintHeapRegionClosure cl; | |
| 5536 heap_region_iterate(&cl); | |
| 5537 heap_region_iterate(&sc); | |
| 5538 sc.print(); | |
| 5539 print_region_accounting_info(); | |
| 5540 }; | |
| 5541 | |
| 5542 bool G1CollectedHeap::regions_accounted_for() { | |
| 5543 // TODO: regions accounting for young/survivor/tenured | |
| 5544 return true; | |
| 5545 } | |
| 5546 | |
| 5547 bool G1CollectedHeap::print_region_accounting_info() { | |
| 5548 gclog_or_tty->print_cr("Free regions: %d (count: %d count list %d) (clean: %d unclean: %d).", | |
| 5549 free_regions(), | |
| 5550 count_free_regions(), count_free_regions_list(), | |
| 5551 _free_region_list_size, _unclean_region_list.sz()); | |
| 5552 gclog_or_tty->print_cr("cur_alloc: %d.", | |
| 5553 (_cur_alloc_region == NULL ? 0 : 1)); | |
| 5554 gclog_or_tty->print_cr("H regions: %d.", _num_humongous_regions); | |
| 5555 | |
| 5556 // TODO: check regions accounting for young/survivor/tenured | |
| 5557 return true; | |
| 5558 } | |
| 5559 | |
| 5560 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
| 5561 HeapRegion* hr = heap_region_containing(p); | |
| 5562 if (hr == NULL) { | |
| 5563 return is_in_permanent(p); | |
| 5564 } else { | |
| 5565 return hr->is_in(p); | |
| 5566 } | |
| 5567 } | |
| 5568 #endif // PRODUCT | |
| 5569 | |
| 5570 void G1CollectedHeap::g1_unimplemented() { | |
| 5571 // Unimplemented(); | |
| 5572 } | |
| 5573 | |
| 5574 | |
| 5575 // Local Variables: *** | |
| 5576 // c-indentation-style: gnu *** | |
| 5577 // End: *** |