Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 989:148e5441d916
6863023: need non-perm oops in code cache for JSR 292
Summary: Make a special root-list for those few nmethods which might contain non-perm oops.
Reviewed-by: twisti, kvn, never, jmasa, ysr
| author | jrose |
|---|---|
| date | Tue, 15 Sep 2009 21:53:47 -0700 |
| parents | 6cb8e9df7174 |
| children | 54b3b351d6f9 |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 579 | 2 * Copyright 2001-2009 Sun Microsystems, Inc. All Rights Reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #include "incls/_precompiled.incl" | |
| 26 #include "incls/_g1CollectedHeap.cpp.incl" | |
| 27 | |
| 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, | |
|
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1594 G1UpdateBufferQueueMaxLength, |
| 794 | 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) { | |
| 889 | 1640 // Clean cards in the hot card cache |
| 1641 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set()); | |
| 1642 | |
| 342 | 1643 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
| 1644 int n_completed_buffers = 0; | |
| 1645 while (dcqs.apply_closure_to_completed_buffer(worker_i, 0, true)) { | |
| 1646 n_completed_buffers++; | |
| 1647 } | |
| 1648 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
| 1649 (double) n_completed_buffers); | |
| 1650 dcqs.clear_n_completed_buffers(); | |
| 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 { | |
|
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1658 assert(Heap_lock->owner() != NULL, |
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1659 "Should be owned on this thread's behalf."); |
| 342 | 1660 size_t result = _summary_bytes_used; |
|
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1661 // Read only once in case it is set to NULL concurrently |
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1662 HeapRegion* hr = _cur_alloc_region; |
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1663 if (hr != NULL) |
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1664 result += hr->used(); |
| 342 | 1665 return result; |
| 1666 } | |
| 1667 | |
|
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1668 size_t G1CollectedHeap::used_unlocked() const { |
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1669 size_t result = _summary_bytes_used; |
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1670 return result; |
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1671 } |
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1672 |
| 342 | 1673 class SumUsedClosure: public HeapRegionClosure { |
| 1674 size_t _used; | |
| 1675 public: | |
| 1676 SumUsedClosure() : _used(0) {} | |
| 1677 bool doHeapRegion(HeapRegion* r) { | |
| 1678 if (!r->continuesHumongous()) { | |
| 1679 _used += r->used(); | |
| 1680 } | |
| 1681 return false; | |
| 1682 } | |
| 1683 size_t result() { return _used; } | |
| 1684 }; | |
| 1685 | |
| 1686 size_t G1CollectedHeap::recalculate_used() const { | |
| 1687 SumUsedClosure blk; | |
| 1688 _hrs->iterate(&blk); | |
| 1689 return blk.result(); | |
| 1690 } | |
| 1691 | |
| 1692 #ifndef PRODUCT | |
| 1693 class SumUsedRegionsClosure: public HeapRegionClosure { | |
| 1694 size_t _num; | |
| 1695 public: | |
| 677 | 1696 SumUsedRegionsClosure() : _num(0) {} |
| 342 | 1697 bool doHeapRegion(HeapRegion* r) { |
| 1698 if (r->continuesHumongous() || r->used() > 0 || r->is_gc_alloc_region()) { | |
| 1699 _num += 1; | |
| 1700 } | |
| 1701 return false; | |
| 1702 } | |
| 1703 size_t result() { return _num; } | |
| 1704 }; | |
| 1705 | |
| 1706 size_t G1CollectedHeap::recalculate_used_regions() const { | |
| 1707 SumUsedRegionsClosure blk; | |
| 1708 _hrs->iterate(&blk); | |
| 1709 return blk.result(); | |
| 1710 } | |
| 1711 #endif // PRODUCT | |
| 1712 | |
| 1713 size_t G1CollectedHeap::unsafe_max_alloc() { | |
| 1714 if (_free_regions > 0) return HeapRegion::GrainBytes; | |
| 1715 // otherwise, is there space in the current allocation region? | |
| 1716 | |
| 1717 // We need to store the current allocation region in a local variable | |
| 1718 // here. The problem is that this method doesn't take any locks and | |
| 1719 // there may be other threads which overwrite the current allocation | |
| 1720 // region field. attempt_allocation(), for example, sets it to NULL | |
| 1721 // and this can happen *after* the NULL check here but before the call | |
| 1722 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
| 1723 // to be a problem in the optimized build, since the two loads of the | |
| 1724 // current allocation region field are optimized away. | |
| 1725 HeapRegion* car = _cur_alloc_region; | |
| 1726 | |
| 1727 // FIXME: should iterate over all regions? | |
| 1728 if (car == NULL) { | |
| 1729 return 0; | |
| 1730 } | |
| 1731 return car->free(); | |
| 1732 } | |
| 1733 | |
| 1734 void G1CollectedHeap::collect(GCCause::Cause cause) { | |
| 1735 // The caller doesn't have the Heap_lock | |
| 1736 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
| 1737 MutexLocker ml(Heap_lock); | |
| 1738 collect_locked(cause); | |
| 1739 } | |
| 1740 | |
| 1741 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { | |
| 1742 assert(Thread::current()->is_VM_thread(), "Precondition#1"); | |
| 1743 assert(Heap_lock->is_locked(), "Precondition#2"); | |
| 1744 GCCauseSetter gcs(this, cause); | |
| 1745 switch (cause) { | |
| 1746 case GCCause::_heap_inspection: | |
| 1747 case GCCause::_heap_dump: { | |
| 1748 HandleMark hm; | |
| 1749 do_full_collection(false); // don't clear all soft refs | |
| 1750 break; | |
| 1751 } | |
| 1752 default: // XXX FIX ME | |
| 1753 ShouldNotReachHere(); // Unexpected use of this function | |
| 1754 } | |
| 1755 } | |
| 1756 | |
| 1757 | |
| 1758 void G1CollectedHeap::collect_locked(GCCause::Cause cause) { | |
| 1759 // Don't want to do a GC until cleanup is completed. | |
| 1760 wait_for_cleanup_complete(); | |
| 1761 | |
| 1762 // Read the GC count while holding the Heap_lock | |
| 1763 int gc_count_before = SharedHeap::heap()->total_collections(); | |
| 1764 { | |
| 1765 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
| 1766 VM_G1CollectFull op(gc_count_before, cause); | |
| 1767 VMThread::execute(&op); | |
| 1768 } | |
| 1769 } | |
| 1770 | |
| 1771 bool G1CollectedHeap::is_in(const void* p) const { | |
| 1772 if (_g1_committed.contains(p)) { | |
| 1773 HeapRegion* hr = _hrs->addr_to_region(p); | |
| 1774 return hr->is_in(p); | |
| 1775 } else { | |
| 1776 return _perm_gen->as_gen()->is_in(p); | |
| 1777 } | |
| 1778 } | |
| 1779 | |
| 1780 // Iteration functions. | |
| 1781 | |
| 1782 // Iterates an OopClosure over all ref-containing fields of objects | |
| 1783 // within a HeapRegion. | |
| 1784 | |
| 1785 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
| 1786 MemRegion _mr; | |
| 1787 OopClosure* _cl; | |
| 1788 public: | |
| 1789 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
| 1790 : _mr(mr), _cl(cl) {} | |
| 1791 bool doHeapRegion(HeapRegion* r) { | |
| 1792 if (! r->continuesHumongous()) { | |
| 1793 r->oop_iterate(_cl); | |
| 1794 } | |
| 1795 return false; | |
| 1796 } | |
| 1797 }; | |
| 1798 | |
| 678 | 1799 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
| 342 | 1800 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
| 1801 _hrs->iterate(&blk); | |
| 678 | 1802 if (do_perm) { |
| 1803 perm_gen()->oop_iterate(cl); | |
| 1804 } | |
| 342 | 1805 } |
| 1806 | |
| 678 | 1807 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
| 342 | 1808 IterateOopClosureRegionClosure blk(mr, cl); |
| 1809 _hrs->iterate(&blk); | |
| 678 | 1810 if (do_perm) { |
| 1811 perm_gen()->oop_iterate(cl); | |
| 1812 } | |
| 342 | 1813 } |
| 1814 | |
| 1815 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
| 1816 | |
| 1817 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
| 1818 ObjectClosure* _cl; | |
| 1819 public: | |
| 1820 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
| 1821 bool doHeapRegion(HeapRegion* r) { | |
| 1822 if (! r->continuesHumongous()) { | |
| 1823 r->object_iterate(_cl); | |
| 1824 } | |
| 1825 return false; | |
| 1826 } | |
| 1827 }; | |
| 1828 | |
| 678 | 1829 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
| 342 | 1830 IterateObjectClosureRegionClosure blk(cl); |
| 1831 _hrs->iterate(&blk); | |
| 678 | 1832 if (do_perm) { |
| 1833 perm_gen()->object_iterate(cl); | |
| 1834 } | |
| 342 | 1835 } |
| 1836 | |
| 1837 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
| 1838 // FIXME: is this right? | |
| 1839 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
| 1840 } | |
| 1841 | |
| 1842 // Calls a SpaceClosure on a HeapRegion. | |
| 1843 | |
| 1844 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
| 1845 SpaceClosure* _cl; | |
| 1846 public: | |
| 1847 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
| 1848 bool doHeapRegion(HeapRegion* r) { | |
| 1849 _cl->do_space(r); | |
| 1850 return false; | |
| 1851 } | |
| 1852 }; | |
| 1853 | |
| 1854 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
| 1855 SpaceClosureRegionClosure blk(cl); | |
| 1856 _hrs->iterate(&blk); | |
| 1857 } | |
| 1858 | |
| 1859 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) { | |
| 1860 _hrs->iterate(cl); | |
| 1861 } | |
| 1862 | |
| 1863 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
| 1864 HeapRegionClosure* cl) { | |
| 1865 _hrs->iterate_from(r, cl); | |
| 1866 } | |
| 1867 | |
| 1868 void | |
| 1869 G1CollectedHeap::heap_region_iterate_from(int idx, HeapRegionClosure* cl) { | |
| 1870 _hrs->iterate_from(idx, cl); | |
| 1871 } | |
| 1872 | |
| 1873 HeapRegion* G1CollectedHeap::region_at(size_t idx) { return _hrs->at(idx); } | |
| 1874 | |
| 1875 void | |
| 1876 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
| 1877 int worker, | |
| 1878 jint claim_value) { | |
| 355 | 1879 const size_t regions = n_regions(); |
| 1880 const size_t worker_num = (ParallelGCThreads > 0 ? ParallelGCThreads : 1); | |
| 1881 // try to spread out the starting points of the workers | |
| 1882 const size_t start_index = regions / worker_num * (size_t) worker; | |
| 1883 | |
| 1884 // each worker will actually look at all regions | |
| 1885 for (size_t count = 0; count < regions; ++count) { | |
| 1886 const size_t index = (start_index + count) % regions; | |
| 1887 assert(0 <= index && index < regions, "sanity"); | |
| 1888 HeapRegion* r = region_at(index); | |
| 1889 // we'll ignore "continues humongous" regions (we'll process them | |
| 1890 // when we come across their corresponding "start humongous" | |
| 1891 // region) and regions already claimed | |
| 1892 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
| 1893 continue; | |
| 1894 } | |
| 1895 // OK, try to claim it | |
| 342 | 1896 if (r->claimHeapRegion(claim_value)) { |
| 355 | 1897 // success! |
| 1898 assert(!r->continuesHumongous(), "sanity"); | |
| 1899 if (r->startsHumongous()) { | |
| 1900 // If the region is "starts humongous" we'll iterate over its | |
| 1901 // "continues humongous" first; in fact we'll do them | |
| 1902 // first. The order is important. In on case, calling the | |
| 1903 // closure on the "starts humongous" region might de-allocate | |
| 1904 // and clear all its "continues humongous" regions and, as a | |
| 1905 // result, we might end up processing them twice. So, we'll do | |
| 1906 // them first (notice: most closures will ignore them anyway) and | |
| 1907 // then we'll do the "starts humongous" region. | |
| 1908 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
| 1909 HeapRegion* chr = region_at(ch_index); | |
| 1910 | |
| 1911 // if the region has already been claimed or it's not | |
| 1912 // "continues humongous" we're done | |
| 1913 if (chr->claim_value() == claim_value || | |
| 1914 !chr->continuesHumongous()) { | |
| 1915 break; | |
| 1916 } | |
| 1917 | |
| 1918 // Noone should have claimed it directly. We can given | |
| 1919 // that we claimed its "starts humongous" region. | |
| 1920 assert(chr->claim_value() != claim_value, "sanity"); | |
| 1921 assert(chr->humongous_start_region() == r, "sanity"); | |
| 1922 | |
| 1923 if (chr->claimHeapRegion(claim_value)) { | |
| 1924 // we should always be able to claim it; noone else should | |
| 1925 // be trying to claim this region | |
| 1926 | |
| 1927 bool res2 = cl->doHeapRegion(chr); | |
| 1928 assert(!res2, "Should not abort"); | |
| 1929 | |
| 1930 // Right now, this holds (i.e., no closure that actually | |
| 1931 // does something with "continues humongous" regions | |
| 1932 // clears them). We might have to weaken it in the future, | |
| 1933 // but let's leave these two asserts here for extra safety. | |
| 1934 assert(chr->continuesHumongous(), "should still be the case"); | |
| 1935 assert(chr->humongous_start_region() == r, "sanity"); | |
| 1936 } else { | |
| 1937 guarantee(false, "we should not reach here"); | |
| 1938 } | |
| 1939 } | |
| 1940 } | |
| 1941 | |
| 1942 assert(!r->continuesHumongous(), "sanity"); | |
| 1943 bool res = cl->doHeapRegion(r); | |
| 1944 assert(!res, "Should not abort"); | |
| 1945 } | |
| 1946 } | |
| 1947 } | |
| 1948 | |
| 390 | 1949 class ResetClaimValuesClosure: public HeapRegionClosure { |
| 1950 public: | |
| 1951 bool doHeapRegion(HeapRegion* r) { | |
| 1952 r->set_claim_value(HeapRegion::InitialClaimValue); | |
| 1953 return false; | |
| 1954 } | |
| 1955 }; | |
| 1956 | |
| 1957 void | |
| 1958 G1CollectedHeap::reset_heap_region_claim_values() { | |
| 1959 ResetClaimValuesClosure blk; | |
| 1960 heap_region_iterate(&blk); | |
| 1961 } | |
| 1962 | |
| 355 | 1963 #ifdef ASSERT |
| 1964 // This checks whether all regions in the heap have the correct claim | |
| 1965 // value. I also piggy-backed on this a check to ensure that the | |
| 1966 // humongous_start_region() information on "continues humongous" | |
| 1967 // regions is correct. | |
| 1968 | |
| 1969 class CheckClaimValuesClosure : public HeapRegionClosure { | |
| 1970 private: | |
| 1971 jint _claim_value; | |
| 1972 size_t _failures; | |
| 1973 HeapRegion* _sh_region; | |
| 1974 public: | |
| 1975 CheckClaimValuesClosure(jint claim_value) : | |
| 1976 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
| 1977 bool doHeapRegion(HeapRegion* r) { | |
| 1978 if (r->claim_value() != _claim_value) { | |
| 1979 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
| 1980 "claim value = %d, should be %d", | |
| 1981 r->bottom(), r->end(), r->claim_value(), | |
| 1982 _claim_value); | |
| 1983 ++_failures; | |
| 1984 } | |
| 1985 if (!r->isHumongous()) { | |
| 1986 _sh_region = NULL; | |
| 1987 } else if (r->startsHumongous()) { | |
| 1988 _sh_region = r; | |
| 1989 } else if (r->continuesHumongous()) { | |
| 1990 if (r->humongous_start_region() != _sh_region) { | |
| 1991 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
| 1992 "HS = "PTR_FORMAT", should be "PTR_FORMAT, | |
| 1993 r->bottom(), r->end(), | |
| 1994 r->humongous_start_region(), | |
| 1995 _sh_region); | |
| 1996 ++_failures; | |
| 342 | 1997 } |
| 1998 } | |
| 355 | 1999 return false; |
| 2000 } | |
| 2001 size_t failures() { | |
| 2002 return _failures; | |
| 2003 } | |
| 2004 }; | |
| 2005 | |
| 2006 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
| 2007 CheckClaimValuesClosure cl(claim_value); | |
| 2008 heap_region_iterate(&cl); | |
| 2009 return cl.failures() == 0; | |
| 2010 } | |
| 2011 #endif // ASSERT | |
| 342 | 2012 |
| 2013 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { | |
| 2014 HeapRegion* r = g1_policy()->collection_set(); | |
| 2015 while (r != NULL) { | |
| 2016 HeapRegion* next = r->next_in_collection_set(); | |
| 2017 if (cl->doHeapRegion(r)) { | |
| 2018 cl->incomplete(); | |
| 2019 return; | |
| 2020 } | |
| 2021 r = next; | |
| 2022 } | |
| 2023 } | |
| 2024 | |
| 2025 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
| 2026 HeapRegionClosure *cl) { | |
| 2027 assert(r->in_collection_set(), | |
| 2028 "Start region must be a member of the collection set."); | |
| 2029 HeapRegion* cur = r; | |
| 2030 while (cur != NULL) { | |
| 2031 HeapRegion* next = cur->next_in_collection_set(); | |
| 2032 if (cl->doHeapRegion(cur) && false) { | |
| 2033 cl->incomplete(); | |
| 2034 return; | |
| 2035 } | |
| 2036 cur = next; | |
| 2037 } | |
| 2038 cur = g1_policy()->collection_set(); | |
| 2039 while (cur != r) { | |
| 2040 HeapRegion* next = cur->next_in_collection_set(); | |
| 2041 if (cl->doHeapRegion(cur) && false) { | |
| 2042 cl->incomplete(); | |
| 2043 return; | |
| 2044 } | |
| 2045 cur = next; | |
| 2046 } | |
| 2047 } | |
| 2048 | |
| 2049 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
| 2050 return _hrs->length() > 0 ? _hrs->at(0) : NULL; | |
| 2051 } | |
| 2052 | |
| 2053 | |
| 2054 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
| 2055 Space* res = heap_region_containing(addr); | |
| 2056 if (res == NULL) | |
| 2057 res = perm_gen()->space_containing(addr); | |
| 2058 return res; | |
| 2059 } | |
| 2060 | |
| 2061 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
| 2062 Space* sp = space_containing(addr); | |
| 2063 if (sp != NULL) { | |
| 2064 return sp->block_start(addr); | |
| 2065 } | |
| 2066 return NULL; | |
| 2067 } | |
| 2068 | |
| 2069 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
| 2070 Space* sp = space_containing(addr); | |
| 2071 assert(sp != NULL, "block_size of address outside of heap"); | |
| 2072 return sp->block_size(addr); | |
| 2073 } | |
| 2074 | |
| 2075 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
| 2076 Space* sp = space_containing(addr); | |
| 2077 return sp->block_is_obj(addr); | |
| 2078 } | |
| 2079 | |
| 2080 bool G1CollectedHeap::supports_tlab_allocation() const { | |
| 2081 return true; | |
| 2082 } | |
| 2083 | |
| 2084 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
| 2085 return HeapRegion::GrainBytes; | |
| 2086 } | |
| 2087 | |
| 2088 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
| 2089 // Return the remaining space in the cur alloc region, but not less than | |
| 2090 // the min TLAB size. | |
| 2091 // Also, no more than half the region size, since we can't allow tlabs to | |
| 2092 // grow big enough to accomodate humongous objects. | |
| 2093 | |
| 2094 // We need to story it locally, since it might change between when we | |
| 2095 // test for NULL and when we use it later. | |
| 2096 ContiguousSpace* cur_alloc_space = _cur_alloc_region; | |
| 2097 if (cur_alloc_space == NULL) { | |
| 2098 return HeapRegion::GrainBytes/2; | |
| 2099 } else { | |
| 2100 return MAX2(MIN2(cur_alloc_space->free(), | |
| 2101 (size_t)(HeapRegion::GrainBytes/2)), | |
| 2102 (size_t)MinTLABSize); | |
| 2103 } | |
| 2104 } | |
| 2105 | |
| 2106 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t size) { | |
| 2107 bool dummy; | |
| 2108 return G1CollectedHeap::mem_allocate(size, false, true, &dummy); | |
| 2109 } | |
| 2110 | |
| 2111 bool G1CollectedHeap::allocs_are_zero_filled() { | |
| 2112 return false; | |
| 2113 } | |
| 2114 | |
| 2115 size_t G1CollectedHeap::large_typearray_limit() { | |
| 2116 // FIXME | |
| 2117 return HeapRegion::GrainBytes/HeapWordSize; | |
| 2118 } | |
| 2119 | |
| 2120 size_t G1CollectedHeap::max_capacity() const { | |
| 2121 return _g1_committed.byte_size(); | |
| 2122 } | |
| 2123 | |
| 2124 jlong G1CollectedHeap::millis_since_last_gc() { | |
| 2125 // assert(false, "NYI"); | |
| 2126 return 0; | |
| 2127 } | |
| 2128 | |
| 2129 | |
| 2130 void G1CollectedHeap::prepare_for_verify() { | |
| 2131 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
| 2132 ensure_parsability(false); | |
| 2133 } | |
| 2134 g1_rem_set()->prepare_for_verify(); | |
| 2135 } | |
| 2136 | |
| 2137 class VerifyLivenessOopClosure: public OopClosure { | |
| 2138 G1CollectedHeap* g1h; | |
| 2139 public: | |
| 2140 VerifyLivenessOopClosure(G1CollectedHeap* _g1h) { | |
| 2141 g1h = _g1h; | |
| 2142 } | |
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2143 void do_oop(narrowOop *p) { do_oop_work(p); } |
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2144 void do_oop( oop *p) { do_oop_work(p); } |
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2145 |
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2146 template <class T> void do_oop_work(T *p) { |
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2147 oop obj = oopDesc::load_decode_heap_oop(p); |
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2148 guarantee(obj == NULL || !g1h->is_obj_dead(obj), |
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2149 "Dead object referenced by a not dead object"); |
| 342 | 2150 } |
| 2151 }; | |
| 2152 | |
| 2153 class VerifyObjsInRegionClosure: public ObjectClosure { | |
| 811 | 2154 private: |
| 342 | 2155 G1CollectedHeap* _g1h; |
| 2156 size_t _live_bytes; | |
| 2157 HeapRegion *_hr; | |
| 811 | 2158 bool _use_prev_marking; |
| 342 | 2159 public: |
| 811 | 2160 // use_prev_marking == true -> use "prev" marking information, |
| 2161 // use_prev_marking == false -> use "next" marking information | |
| 2162 VerifyObjsInRegionClosure(HeapRegion *hr, bool use_prev_marking) | |
| 2163 : _live_bytes(0), _hr(hr), _use_prev_marking(use_prev_marking) { | |
| 342 | 2164 _g1h = G1CollectedHeap::heap(); |
| 2165 } | |
| 2166 void do_object(oop o) { | |
| 2167 VerifyLivenessOopClosure isLive(_g1h); | |
| 2168 assert(o != NULL, "Huh?"); | |
| 811 | 2169 if (!_g1h->is_obj_dead_cond(o, _use_prev_marking)) { |
| 342 | 2170 o->oop_iterate(&isLive); |
| 2171 if (!_hr->obj_allocated_since_prev_marking(o)) | |
| 2172 _live_bytes += (o->size() * HeapWordSize); | |
| 2173 } | |
| 2174 } | |
| 2175 size_t live_bytes() { return _live_bytes; } | |
| 2176 }; | |
| 2177 | |
| 2178 class PrintObjsInRegionClosure : public ObjectClosure { | |
| 2179 HeapRegion *_hr; | |
| 2180 G1CollectedHeap *_g1; | |
| 2181 public: | |
| 2182 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
| 2183 _g1 = G1CollectedHeap::heap(); | |
| 2184 }; | |
| 2185 | |
| 2186 void do_object(oop o) { | |
| 2187 if (o != NULL) { | |
| 2188 HeapWord *start = (HeapWord *) o; | |
| 2189 size_t word_sz = o->size(); | |
| 2190 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
| 2191 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
| 2192 (void*) o, word_sz, | |
| 2193 _g1->isMarkedPrev(o), | |
| 2194 _g1->isMarkedNext(o), | |
| 2195 _hr->obj_allocated_since_prev_marking(o)); | |
| 2196 HeapWord *end = start + word_sz; | |
| 2197 HeapWord *cur; | |
| 2198 int *val; | |
| 2199 for (cur = start; cur < end; cur++) { | |
| 2200 val = (int *) cur; | |
| 2201 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
| 2202 } | |
| 2203 } | |
| 2204 } | |
| 2205 }; | |
| 2206 | |
| 2207 class VerifyRegionClosure: public HeapRegionClosure { | |
| 811 | 2208 private: |
| 342 | 2209 bool _allow_dirty; |
| 390 | 2210 bool _par; |
| 811 | 2211 bool _use_prev_marking; |
| 2212 public: | |
| 2213 // use_prev_marking == true -> use "prev" marking information, | |
| 2214 // use_prev_marking == false -> use "next" marking information | |
| 2215 VerifyRegionClosure(bool allow_dirty, bool par, bool use_prev_marking) | |
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2216 : _allow_dirty(allow_dirty), |
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2217 _par(par), |
| 811 | 2218 _use_prev_marking(use_prev_marking) {} |
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2219 |
| 342 | 2220 bool doHeapRegion(HeapRegion* r) { |
| 390 | 2221 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
| 2222 "Should be unclaimed at verify points."); | |
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2223 if (!r->continuesHumongous()) { |
| 811 | 2224 VerifyObjsInRegionClosure not_dead_yet_cl(r, _use_prev_marking); |
| 2225 r->verify(_allow_dirty, _use_prev_marking); | |
| 342 | 2226 r->object_iterate(¬_dead_yet_cl); |
| 2227 guarantee(r->max_live_bytes() >= not_dead_yet_cl.live_bytes(), | |
| 2228 "More live objects than counted in last complete marking."); | |
| 2229 } | |
| 2230 return false; | |
| 2231 } | |
| 2232 }; | |
| 2233 | |
| 2234 class VerifyRootsClosure: public OopsInGenClosure { | |
| 2235 private: | |
| 2236 G1CollectedHeap* _g1h; | |
| 2237 bool _failures; | |
| 811 | 2238 bool _use_prev_marking; |
| 342 | 2239 public: |
| 811 | 2240 // use_prev_marking == true -> use "prev" marking information, |
| 2241 // use_prev_marking == false -> use "next" marking information | |
| 2242 VerifyRootsClosure(bool use_prev_marking) : | |
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2243 _g1h(G1CollectedHeap::heap()), |
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2244 _failures(false), |
| 811 | 2245 _use_prev_marking(use_prev_marking) { } |
| 342 | 2246 |
| 2247 bool failures() { return _failures; } | |
| 2248 | |
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2249 template <class T> void do_oop_nv(T* p) { |
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2250 T heap_oop = oopDesc::load_heap_oop(p); |
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2251 if (!oopDesc::is_null(heap_oop)) { |
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2252 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
| 811 | 2253 if (_g1h->is_obj_dead_cond(obj, _use_prev_marking)) { |
| 342 | 2254 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
| 2255 "points to dead obj "PTR_FORMAT, p, (void*) obj); | |
| 2256 obj->print_on(gclog_or_tty); | |
| 2257 _failures = true; | |
| 2258 } | |
| 2259 } | |
| 2260 } | |
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2261 |
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2262 void do_oop(oop* p) { do_oop_nv(p); } |
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2263 void do_oop(narrowOop* p) { do_oop_nv(p); } |
| 342 | 2264 }; |
| 2265 | |
| 390 | 2266 // This is the task used for parallel heap verification. |
| 2267 | |
| 2268 class G1ParVerifyTask: public AbstractGangTask { | |
| 2269 private: | |
| 2270 G1CollectedHeap* _g1h; | |
| 2271 bool _allow_dirty; | |
| 811 | 2272 bool _use_prev_marking; |
| 390 | 2273 |
| 2274 public: | |
| 811 | 2275 // use_prev_marking == true -> use "prev" marking information, |
| 2276 // use_prev_marking == false -> use "next" marking information | |
| 2277 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, | |
| 2278 bool use_prev_marking) : | |
| 390 | 2279 AbstractGangTask("Parallel verify task"), |
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2280 _g1h(g1h), |
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2281 _allow_dirty(allow_dirty), |
| 811 | 2282 _use_prev_marking(use_prev_marking) { } |
| 390 | 2283 |
| 2284 void work(int worker_i) { | |
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2285 HandleMark hm; |
| 811 | 2286 VerifyRegionClosure blk(_allow_dirty, true, _use_prev_marking); |
| 390 | 2287 _g1h->heap_region_par_iterate_chunked(&blk, worker_i, |
| 2288 HeapRegion::ParVerifyClaimValue); | |
| 2289 } | |
| 2290 }; | |
| 2291 | |
| 342 | 2292 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
| 811 | 2293 verify(allow_dirty, silent, /* use_prev_marking */ true); |
| 2294 } | |
| 2295 | |
| 2296 void G1CollectedHeap::verify(bool allow_dirty, | |
| 2297 bool silent, | |
| 2298 bool use_prev_marking) { | |
| 342 | 2299 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
| 2300 if (!silent) { gclog_or_tty->print("roots "); } | |
| 811 | 2301 VerifyRootsClosure rootsCl(use_prev_marking); |
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2302 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
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2303 process_strong_roots(true, // activate StrongRootsScope |
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2304 false, |
| 342 | 2305 SharedHeap::SO_AllClasses, |
| 2306 &rootsCl, | |
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2307 &blobsCl, |
| 342 | 2308 &rootsCl); |
| 2309 rem_set()->invalidate(perm_gen()->used_region(), false); | |
| 2310 if (!silent) { gclog_or_tty->print("heapRegions "); } | |
| 390 | 2311 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
| 2312 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2313 "sanity check"); | |
| 2314 | |
| 811 | 2315 G1ParVerifyTask task(this, allow_dirty, use_prev_marking); |
| 390 | 2316 int n_workers = workers()->total_workers(); |
| 2317 set_par_threads(n_workers); | |
| 2318 workers()->run_task(&task); | |
| 2319 set_par_threads(0); | |
| 2320 | |
| 2321 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), | |
| 2322 "sanity check"); | |
| 2323 | |
| 2324 reset_heap_region_claim_values(); | |
| 2325 | |
| 2326 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2327 "sanity check"); | |
| 2328 } else { | |
| 811 | 2329 VerifyRegionClosure blk(allow_dirty, false, use_prev_marking); |
| 390 | 2330 _hrs->iterate(&blk); |
| 2331 } | |
| 342 | 2332 if (!silent) gclog_or_tty->print("remset "); |
| 2333 rem_set()->verify(); | |
| 2334 guarantee(!rootsCl.failures(), "should not have had failures"); | |
| 2335 } else { | |
| 2336 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
| 2337 } | |
| 2338 } | |
| 2339 | |
| 2340 class PrintRegionClosure: public HeapRegionClosure { | |
| 2341 outputStream* _st; | |
| 2342 public: | |
| 2343 PrintRegionClosure(outputStream* st) : _st(st) {} | |
| 2344 bool doHeapRegion(HeapRegion* r) { | |
| 2345 r->print_on(_st); | |
| 2346 return false; | |
| 2347 } | |
| 2348 }; | |
| 2349 | |
|
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2350 void G1CollectedHeap::print() const { print_on(tty); } |
| 342 | 2351 |
| 2352 void G1CollectedHeap::print_on(outputStream* st) const { | |
|
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2353 print_on(st, PrintHeapAtGCExtended); |
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2354 } |
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2355 |
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2356 void G1CollectedHeap::print_on(outputStream* st, bool extended) const { |
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2357 st->print(" %-20s", "garbage-first heap"); |
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2358 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
|
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2359 capacity()/K, used_unlocked()/K); |
|
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2360 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
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2361 _g1_storage.low_boundary(), |
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2362 _g1_storage.high(), |
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2363 _g1_storage.high_boundary()); |
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2364 st->cr(); |
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2365 st->print(" region size " SIZE_FORMAT "K, ", |
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2366 HeapRegion::GrainBytes/K); |
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2367 size_t young_regions = _young_list->length(); |
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2368 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
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2369 young_regions, young_regions * HeapRegion::GrainBytes / K); |
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2370 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
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2371 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
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2372 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
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2373 st->cr(); |
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2374 perm()->as_gen()->print_on(st); |
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2375 if (extended) { |
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2376 print_on_extended(st); |
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2377 } |
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2378 } |
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2379 |
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2380 void G1CollectedHeap::print_on_extended(outputStream* st) const { |
| 342 | 2381 PrintRegionClosure blk(st); |
| 2382 _hrs->iterate(&blk); | |
| 2383 } | |
| 2384 | |
| 794 | 2385 class PrintOnThreadsClosure : public ThreadClosure { |
| 2386 outputStream* _st; | |
| 2387 public: | |
| 2388 PrintOnThreadsClosure(outputStream* st) : _st(st) { } | |
| 2389 virtual void do_thread(Thread *t) { | |
| 2390 t->print_on(_st); | |
| 2391 } | |
| 2392 }; | |
| 2393 | |
| 342 | 2394 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { |
| 2395 if (ParallelGCThreads > 0) { | |
| 2396 workers()->print_worker_threads(); | |
| 2397 } | |
| 2398 st->print("\"G1 concurrent mark GC Thread\" "); | |
| 2399 _cmThread->print(); | |
| 2400 st->cr(); | |
| 794 | 2401 st->print("\"G1 concurrent refinement GC Threads\" "); |
| 2402 PrintOnThreadsClosure p(st); | |
| 2403 _cg1r->threads_do(&p); | |
| 342 | 2404 st->cr(); |
| 2405 st->print("\"G1 zero-fill GC Thread\" "); | |
| 2406 _czft->print_on(st); | |
| 2407 st->cr(); | |
| 2408 } | |
| 2409 | |
| 2410 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
| 2411 if (ParallelGCThreads > 0) { | |
| 2412 workers()->threads_do(tc); | |
| 2413 } | |
| 2414 tc->do_thread(_cmThread); | |
| 794 | 2415 _cg1r->threads_do(tc); |
| 342 | 2416 tc->do_thread(_czft); |
| 2417 } | |
| 2418 | |
| 2419 void G1CollectedHeap::print_tracing_info() const { | |
| 2420 // We'll overload this to mean "trace GC pause statistics." | |
| 2421 if (TraceGen0Time || TraceGen1Time) { | |
| 2422 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
| 2423 // to that. | |
| 2424 g1_policy()->print_tracing_info(); | |
| 2425 } | |
| 751 | 2426 if (G1SummarizeRSetStats) { |
| 342 | 2427 g1_rem_set()->print_summary_info(); |
| 2428 } | |
| 751 | 2429 if (G1SummarizeConcurrentMark) { |
| 342 | 2430 concurrent_mark()->print_summary_info(); |
| 2431 } | |
| 751 | 2432 if (G1SummarizeZFStats) { |
| 342 | 2433 ConcurrentZFThread::print_summary_info(); |
| 2434 } | |
| 2435 g1_policy()->print_yg_surv_rate_info(); | |
| 2436 | |
| 2437 GCOverheadReporter::printGCOverhead(); | |
| 2438 | |
| 2439 SpecializationStats::print(); | |
| 2440 } | |
| 2441 | |
| 2442 | |
| 2443 int G1CollectedHeap::addr_to_arena_id(void* addr) const { | |
| 2444 HeapRegion* hr = heap_region_containing(addr); | |
| 2445 if (hr == NULL) { | |
| 2446 return 0; | |
| 2447 } else { | |
| 2448 return 1; | |
| 2449 } | |
| 2450 } | |
| 2451 | |
| 2452 G1CollectedHeap* G1CollectedHeap::heap() { | |
| 2453 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
| 2454 "not a garbage-first heap"); | |
| 2455 return _g1h; | |
| 2456 } | |
| 2457 | |
| 2458 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
| 2459 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); | |
| 2460 // Call allocation profiler | |
| 2461 AllocationProfiler::iterate_since_last_gc(); | |
| 2462 // Fill TLAB's and such | |
| 2463 ensure_parsability(true); | |
| 2464 } | |
| 2465 | |
| 2466 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
| 2467 // FIXME: what is this about? | |
| 2468 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
| 2469 // is set. | |
| 2470 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
| 2471 "derived pointer present")); | |
| 2472 } | |
| 2473 | |
| 2474 void G1CollectedHeap::do_collection_pause() { | |
| 2475 // Read the GC count while holding the Heap_lock | |
| 2476 // we need to do this _before_ wait_for_cleanup_complete(), to | |
| 2477 // ensure that we do not give up the heap lock and potentially | |
| 2478 // pick up the wrong count | |
| 2479 int gc_count_before = SharedHeap::heap()->total_collections(); | |
| 2480 | |
| 2481 // Don't want to do a GC pause while cleanup is being completed! | |
| 2482 wait_for_cleanup_complete(); | |
| 2483 | |
| 2484 g1_policy()->record_stop_world_start(); | |
| 2485 { | |
| 2486 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
| 2487 VM_G1IncCollectionPause op(gc_count_before); | |
| 2488 VMThread::execute(&op); | |
| 2489 } | |
| 2490 } | |
| 2491 | |
| 2492 void | |
| 2493 G1CollectedHeap::doConcurrentMark() { | |
|
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2494 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
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2495 if (!_cmThread->in_progress()) { |
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2496 _cmThread->set_started(); |
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2497 CGC_lock->notify(); |
| 342 | 2498 } |
| 2499 } | |
| 2500 | |
| 2501 class VerifyMarkedObjsClosure: public ObjectClosure { | |
| 2502 G1CollectedHeap* _g1h; | |
| 2503 public: | |
| 2504 VerifyMarkedObjsClosure(G1CollectedHeap* g1h) : _g1h(g1h) {} | |
| 2505 void do_object(oop obj) { | |
| 2506 assert(obj->mark()->is_marked() ? !_g1h->is_obj_dead(obj) : true, | |
| 2507 "markandsweep mark should agree with concurrent deadness"); | |
| 2508 } | |
| 2509 }; | |
| 2510 | |
| 2511 void | |
| 2512 G1CollectedHeap::checkConcurrentMark() { | |
| 2513 VerifyMarkedObjsClosure verifycl(this); | |
| 2514 // MutexLockerEx x(getMarkBitMapLock(), | |
| 2515 // Mutex::_no_safepoint_check_flag); | |
| 678 | 2516 object_iterate(&verifycl, false); |
| 342 | 2517 } |
| 2518 | |
| 2519 void G1CollectedHeap::do_sync_mark() { | |
| 2520 _cm->checkpointRootsInitial(); | |
| 2521 _cm->markFromRoots(); | |
| 2522 _cm->checkpointRootsFinal(false); | |
| 2523 } | |
| 2524 | |
| 2525 // <NEW PREDICTION> | |
| 2526 | |
| 2527 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
| 2528 bool young) { | |
| 2529 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
| 2530 } | |
| 2531 | |
| 2532 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
| 2533 predicted_time_ms) { | |
| 2534 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
| 2535 } | |
| 2536 | |
| 2537 size_t G1CollectedHeap::pending_card_num() { | |
| 2538 size_t extra_cards = 0; | |
| 2539 JavaThread *curr = Threads::first(); | |
| 2540 while (curr != NULL) { | |
| 2541 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
| 2542 extra_cards += dcq.size(); | |
| 2543 curr = curr->next(); | |
| 2544 } | |
| 2545 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 2546 size_t buffer_size = dcqs.buffer_size(); | |
| 2547 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 2548 return buffer_size * buffer_num + extra_cards; | |
| 2549 } | |
| 2550 | |
| 2551 size_t G1CollectedHeap::max_pending_card_num() { | |
| 2552 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 2553 size_t buffer_size = dcqs.buffer_size(); | |
| 2554 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 2555 int thread_num = Threads::number_of_threads(); | |
| 2556 return (buffer_num + thread_num) * buffer_size; | |
| 2557 } | |
| 2558 | |
| 2559 size_t G1CollectedHeap::cards_scanned() { | |
| 2560 HRInto_G1RemSet* g1_rset = (HRInto_G1RemSet*) g1_rem_set(); | |
| 2561 return g1_rset->cardsScanned(); | |
| 2562 } | |
| 2563 | |
| 2564 void | |
| 2565 G1CollectedHeap::setup_surviving_young_words() { | |
| 2566 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
| 2567 size_t array_length = g1_policy()->young_cset_length(); | |
| 2568 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); | |
| 2569 if (_surviving_young_words == NULL) { | |
| 2570 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
| 2571 "Not enough space for young surv words summary."); | |
| 2572 } | |
| 2573 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
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2574 #ifdef ASSERT |
| 342 | 2575 for (size_t i = 0; i < array_length; ++i) { |
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2576 assert( _surviving_young_words[i] == 0, "memset above" ); |
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2577 } |
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2578 #endif // !ASSERT |
| 342 | 2579 } |
| 2580 | |
| 2581 void | |
| 2582 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
| 2583 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 2584 size_t array_length = g1_policy()->young_cset_length(); | |
| 2585 for (size_t i = 0; i < array_length; ++i) | |
| 2586 _surviving_young_words[i] += surv_young_words[i]; | |
| 2587 } | |
| 2588 | |
| 2589 void | |
| 2590 G1CollectedHeap::cleanup_surviving_young_words() { | |
| 2591 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
| 2592 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
| 2593 _surviving_young_words = NULL; | |
| 2594 } | |
| 2595 | |
| 2596 // </NEW PREDICTION> | |
| 2597 | |
| 2598 void | |
| 677 | 2599 G1CollectedHeap::do_collection_pause_at_safepoint() { |
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2600 if (PrintHeapAtGC) { |
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2601 Universe::print_heap_before_gc(); |
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2602 } |
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2603 |
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2604 { |
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2605 char verbose_str[128]; |
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2606 sprintf(verbose_str, "GC pause "); |
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2607 if (g1_policy()->in_young_gc_mode()) { |
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2608 if (g1_policy()->full_young_gcs()) |
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2609 strcat(verbose_str, "(young)"); |
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2610 else |
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2611 strcat(verbose_str, "(partial)"); |
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2612 } |
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2613 if (g1_policy()->should_initiate_conc_mark()) |
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2614 strcat(verbose_str, " (initial-mark)"); |
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2615 |
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2616 GCCauseSetter x(this, GCCause::_g1_inc_collection_pause); |
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2617 |
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2618 // if PrintGCDetails is on, we'll print long statistics information |
|
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2619 // in the collector policy code, so let's not print this as the output |
|
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2620 // is messy if we do. |
|
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|
2621 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
|
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2622 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
|
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|
2623 TraceTime t(verbose_str, PrintGC && !PrintGCDetails, true, gclog_or_tty); |
|
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|
2624 |
|
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|
2625 ResourceMark rm; |
|
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|
2626 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
|
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|
2627 assert(Thread::current() == VMThread::vm_thread(), "should be in vm thread"); |
|
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2628 guarantee(!is_gc_active(), "collection is not reentrant"); |
|
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2629 assert(regions_accounted_for(), "Region leakage!"); |
|
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2630 |
|
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|
2631 increment_gc_time_stamp(); |
|
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2632 |
|
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|
2633 if (g1_policy()->in_young_gc_mode()) { |
|
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|
2634 assert(check_young_list_well_formed(), |
|
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|
2635 "young list should be well formed"); |
|
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|
2636 } |
|
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2637 |
|
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|
2638 if (GC_locker::is_active()) { |
|
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|
2639 return; // GC is disabled (e.g. JNI GetXXXCritical operation) |
|
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|
2640 } |
|
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|
2641 |
|
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|
2642 bool abandoned = false; |
|
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2643 { // Call to jvmpi::post_class_unload_events must occur outside of active GC |
|
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2644 IsGCActiveMark x; |
|
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2645 |
|
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|
2646 gc_prologue(false); |
|
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|
2647 increment_total_collections(false /* full gc */); |
| 342 | 2648 |
| 2649 #if G1_REM_SET_LOGGING | |
|
838
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|
2650 gclog_or_tty->print_cr("\nJust chose CS, heap:"); |
|
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|
2651 print(); |
| 342 | 2652 #endif |
| 2653 | |
|
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2654 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
|
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2655 HandleMark hm; // Discard invalid handles created during verification |
|
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|
2656 prepare_for_verify(); |
|
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|
2657 gclog_or_tty->print(" VerifyBeforeGC:"); |
|
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|
2658 Universe::verify(false); |
|
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|
2659 } |
|
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|
2660 |
|
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|
2661 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
|
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|
2662 |
|
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|
2663 // We want to turn off ref discovery, if necessary, and turn it back on |
|
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
2664 // on again later if we do. XXX Dubious: why is discovery disabled? |
|
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|
2665 bool was_enabled = ref_processor()->discovery_enabled(); |
|
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|
2666 if (was_enabled) ref_processor()->disable_discovery(); |
|
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|
2667 |
|
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|
2668 // Forget the current alloc region (we might even choose it to be part |
|
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|
2669 // of the collection set!). |
|
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|
2670 abandon_cur_alloc_region(); |
|
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2671 |
|
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|
2672 // The elapsed time induced by the start time below deliberately elides |
|
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|
2673 // the possible verification above. |
|
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|
2674 double start_time_sec = os::elapsedTime(); |
|
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|
2675 GCOverheadReporter::recordSTWStart(start_time_sec); |
|
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|
2676 size_t start_used_bytes = used(); |
|
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|
2677 |
|
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|
2678 g1_policy()->record_collection_pause_start(start_time_sec, |
|
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|
2679 start_used_bytes); |
|
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|
2680 |
|
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|
2681 guarantee(_in_cset_fast_test == NULL, "invariant"); |
|
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|
2682 guarantee(_in_cset_fast_test_base == NULL, "invariant"); |
|
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|
2683 _in_cset_fast_test_length = max_regions(); |
|
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|
2684 _in_cset_fast_test_base = |
| 526 | 2685 NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); |
|
838
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|
2686 memset(_in_cset_fast_test_base, false, |
| 526 | 2687 _in_cset_fast_test_length * sizeof(bool)); |
|
838
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|
2688 // We're biasing _in_cset_fast_test to avoid subtracting the |
|
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|
2689 // beginning of the heap every time we want to index; basically |
|
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|
2690 // it's the same with what we do with the card table. |
|
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|
2691 _in_cset_fast_test = _in_cset_fast_test_base - |
| 526 | 2692 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
| 2693 | |
| 342 | 2694 #if SCAN_ONLY_VERBOSE |
|
838
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|
2695 _young_list->print(); |
| 342 | 2696 #endif // SCAN_ONLY_VERBOSE |
| 2697 | |
|
838
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|
2698 if (g1_policy()->should_initiate_conc_mark()) { |
|
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|
2699 concurrent_mark()->checkpointRootsInitialPre(); |
|
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|
2700 } |
|
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|
2701 save_marks(); |
|
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|
2702 |
|
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|
2703 // We must do this before any possible evacuation that should propagate |
|
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|
2704 // marks. |
|
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|
2705 if (mark_in_progress()) { |
|
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|
2706 double start_time_sec = os::elapsedTime(); |
|
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|
2707 |
|
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|
2708 _cm->drainAllSATBBuffers(); |
|
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|
2709 double finish_mark_ms = (os::elapsedTime() - start_time_sec) * 1000.0; |
|
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|
2710 g1_policy()->record_satb_drain_time(finish_mark_ms); |
|
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|
2711 } |
|
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|
2712 // Record the number of elements currently on the mark stack, so we |
|
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|
2713 // only iterate over these. (Since evacuation may add to the mark |
|
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|
2714 // stack, doing more exposes race conditions.) If no mark is in |
|
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|
2715 // progress, this will be zero. |
|
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|
2716 _cm->set_oops_do_bound(); |
|
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|
2717 |
|
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|
2718 assert(regions_accounted_for(), "Region leakage."); |
|
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|
2719 |
|
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|
2720 if (mark_in_progress()) |
|
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|
2721 concurrent_mark()->newCSet(); |
|
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|
2722 |
|
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|
2723 // Now choose the CS. |
|
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|
2724 g1_policy()->choose_collection_set(); |
|
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|
2725 |
|
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|
2726 // We may abandon a pause if we find no region that will fit in the MMU |
|
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|
2727 // pause. |
|
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|
2728 bool abandoned = (g1_policy()->collection_set() == NULL); |
|
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|
2729 |
|
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|
2730 // Nothing to do if we were unable to choose a collection set. |
|
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|
2731 if (!abandoned) { |
| 342 | 2732 #if G1_REM_SET_LOGGING |
|
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|
2733 gclog_or_tty->print_cr("\nAfter pause, heap:"); |
|
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|
2734 print(); |
| 342 | 2735 #endif |
| 2736 | |
|
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|
2737 setup_surviving_young_words(); |
|
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|
2738 |
|
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|
2739 // Set up the gc allocation regions. |
|
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|
2740 get_gc_alloc_regions(); |
|
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|
2741 |
|
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|
2742 // Actually do the work... |
|
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|
2743 evacuate_collection_set(); |
|
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|
2744 free_collection_set(g1_policy()->collection_set()); |
|
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|
2745 g1_policy()->clear_collection_set(); |
|
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|
2746 |
|
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|
2747 FREE_C_HEAP_ARRAY(bool, _in_cset_fast_test_base); |
|
0316eac49d5a
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|
2748 // this is more for peace of mind; we're nulling them here and |
|
0316eac49d5a
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|
2749 // we're expecting them to be null at the beginning of the next GC |
|
0316eac49d5a
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|
2750 _in_cset_fast_test = NULL; |
|
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|
2751 _in_cset_fast_test_base = NULL; |
|
0316eac49d5a
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|
2752 |
|
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|
2753 release_gc_alloc_regions(false /* totally */); |
|
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|
2754 |
|
0316eac49d5a
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|
2755 cleanup_surviving_young_words(); |
|
0316eac49d5a
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|
2756 |
|
0316eac49d5a
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|
2757 if (g1_policy()->in_young_gc_mode()) { |
|
0316eac49d5a
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|
2758 _young_list->reset_sampled_info(); |
|
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|
2759 assert(check_young_list_empty(true), |
|
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|
2760 "young list should be empty"); |
| 342 | 2761 |
| 2762 #if SCAN_ONLY_VERBOSE | |
|
838
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|
2763 _young_list->print(); |
| 342 | 2764 #endif // SCAN_ONLY_VERBOSE |
| 2765 | |
|
838
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|
2766 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
|
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|
2767 _young_list->first_survivor_region(), |
|
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|
2768 _young_list->last_survivor_region()); |
|
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|
2769 _young_list->reset_auxilary_lists(); |
|
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|
2770 } |
|
0316eac49d5a
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|
2771 } else { |
|
0316eac49d5a
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|
2772 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
| 342 | 2773 } |
|
838
0316eac49d5a
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|
2774 |
|
0316eac49d5a
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|
2775 if (evacuation_failed()) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2776 _summary_bytes_used = recalculate_used(); |
|
0316eac49d5a
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|
2777 } else { |
|
0316eac49d5a
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|
2778 // The "used" of the the collection set have already been subtracted |
|
0316eac49d5a
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|
2779 // when they were freed. Add in the bytes evacuated. |
|
0316eac49d5a
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|
2780 _summary_bytes_used += g1_policy()->bytes_in_to_space(); |
|
0316eac49d5a
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|
2781 } |
|
0316eac49d5a
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|
2782 |
|
0316eac49d5a
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|
2783 if (g1_policy()->in_young_gc_mode() && |
|
0316eac49d5a
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|
2784 g1_policy()->should_initiate_conc_mark()) { |
|
0316eac49d5a
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|
2785 concurrent_mark()->checkpointRootsInitialPost(); |
|
0316eac49d5a
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|
2786 set_marking_started(); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
2787 // CAUTION: after the doConcurrentMark() call below, |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
2788 // the concurrent marking thread(s) could be running |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
2789 // concurrently with us. Make sure that anything after |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
2790 // this point does not assume that we are the only GC thread |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
2791 // running. Note: of course, the actual marking work will |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
2792 // not start until the safepoint itself is released in |
|
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
2793 // ConcurrentGCThread::safepoint_desynchronize(). |
|
838
0316eac49d5a
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|
2794 doConcurrentMark(); |
|
0316eac49d5a
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|
2795 } |
| 342 | 2796 |
| 2797 #if SCAN_ONLY_VERBOSE | |
|
838
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|
2798 _young_list->print(); |
| 342 | 2799 #endif // SCAN_ONLY_VERBOSE |
| 2800 | |
|
838
0316eac49d5a
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|
2801 double end_time_sec = os::elapsedTime(); |
|
0316eac49d5a
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|
2802 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
|
0316eac49d5a
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|
2803 g1_policy()->record_pause_time_ms(pause_time_ms); |
|
0316eac49d5a
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|
2804 GCOverheadReporter::recordSTWEnd(end_time_sec); |
|
0316eac49d5a
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|
2805 g1_policy()->record_collection_pause_end(abandoned); |
|
0316eac49d5a
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|
2806 |
|
0316eac49d5a
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|
2807 assert(regions_accounted_for(), "Region leakage."); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2808 |
|
0316eac49d5a
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|
2809 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
|
0316eac49d5a
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|
2810 HandleMark hm; // Discard invalid handles created during verification |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2811 gclog_or_tty->print(" VerifyAfterGC:"); |
|
0316eac49d5a
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|
2812 prepare_for_verify(); |
|
0316eac49d5a
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|
2813 Universe::verify(false); |
| 342 | 2814 } |
|
838
0316eac49d5a
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|
2815 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2816 if (was_enabled) ref_processor()->enable_discovery(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2817 |
|
0316eac49d5a
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|
2818 { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2819 size_t expand_bytes = g1_policy()->expansion_amount(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2820 if (expand_bytes > 0) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2821 size_t bytes_before = capacity(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2822 expand(expand_bytes); |
|
0316eac49d5a
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|
2823 } |
|
0316eac49d5a
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|
2824 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2825 |
|
0316eac49d5a
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|
2826 if (mark_in_progress()) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2827 concurrent_mark()->update_g1_committed(); |
|
0316eac49d5a
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|
2828 } |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
2829 |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
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545
diff
changeset
|
2830 #ifdef TRACESPINNING |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2831 ParallelTaskTerminator::print_termination_counts(); |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
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545
diff
changeset
|
2832 #endif |
| 342 | 2833 |
|
838
0316eac49d5a
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|
2834 gc_epilogue(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2835 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2836 |
|
0316eac49d5a
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|
2837 assert(verify_region_lists(), "Bad region lists."); |
|
0316eac49d5a
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|
2838 |
|
0316eac49d5a
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|
2839 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2840 gclog_or_tty->print_cr("Stopping after GC #%d", ExitAfterGCNum); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2841 print_tracing_info(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2842 vm_exit(-1); |
|
0316eac49d5a
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|
2843 } |
|
0316eac49d5a
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|
2844 } |
|
0316eac49d5a
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|
2845 |
|
0316eac49d5a
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|
2846 if (PrintHeapAtGC) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2847 Universe::print_heap_after_gc(); |
| 342 | 2848 } |
|
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
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883
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|
2849 if (G1SummarizeRSetStats && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
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diff
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|
2850 (G1SummarizeRSetStatsPeriod > 0) && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
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diff
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|
2851 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
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|
2852 g1_rem_set()->print_summary_info(); |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
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|
2853 } |
| 342 | 2854 } |
| 2855 | |
| 2856 void G1CollectedHeap::set_gc_alloc_region(int purpose, HeapRegion* r) { | |
| 2857 assert(purpose >= 0 && purpose < GCAllocPurposeCount, "invalid purpose"); | |
| 636 | 2858 // make sure we don't call set_gc_alloc_region() multiple times on |
| 2859 // the same region | |
| 2860 assert(r == NULL || !r->is_gc_alloc_region(), | |
| 2861 "shouldn't already be a GC alloc region"); | |
| 342 | 2862 HeapWord* original_top = NULL; |
| 2863 if (r != NULL) | |
| 2864 original_top = r->top(); | |
| 2865 | |
| 2866 // We will want to record the used space in r as being there before gc. | |
| 2867 // One we install it as a GC alloc region it's eligible for allocation. | |
| 2868 // So record it now and use it later. | |
| 2869 size_t r_used = 0; | |
| 2870 if (r != NULL) { | |
| 2871 r_used = r->used(); | |
| 2872 | |
| 2873 if (ParallelGCThreads > 0) { | |
| 2874 // need to take the lock to guard against two threads calling | |
| 2875 // get_gc_alloc_region concurrently (very unlikely but...) | |
| 2876 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 2877 r->save_marks(); | |
| 2878 } | |
| 2879 } | |
| 2880 HeapRegion* old_alloc_region = _gc_alloc_regions[purpose]; | |
| 2881 _gc_alloc_regions[purpose] = r; | |
| 2882 if (old_alloc_region != NULL) { | |
| 2883 // Replace aliases too. | |
| 2884 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 2885 if (_gc_alloc_regions[ap] == old_alloc_region) { | |
| 2886 _gc_alloc_regions[ap] = r; | |
| 2887 } | |
| 2888 } | |
| 2889 } | |
| 2890 if (r != NULL) { | |
| 2891 push_gc_alloc_region(r); | |
| 2892 if (mark_in_progress() && original_top != r->next_top_at_mark_start()) { | |
| 2893 // We are using a region as a GC alloc region after it has been used | |
| 2894 // as a mutator allocation region during the current marking cycle. | |
| 2895 // The mutator-allocated objects are currently implicitly marked, but | |
| 2896 // when we move hr->next_top_at_mark_start() forward at the the end | |
| 2897 // of the GC pause, they won't be. We therefore mark all objects in | |
| 2898 // the "gap". We do this object-by-object, since marking densely | |
| 2899 // does not currently work right with marking bitmap iteration. This | |
| 2900 // means we rely on TLAB filling at the start of pauses, and no | |
| 2901 // "resuscitation" of filled TLAB's. If we want to do this, we need | |
| 2902 // to fix the marking bitmap iteration. | |
| 2903 HeapWord* curhw = r->next_top_at_mark_start(); | |
| 2904 HeapWord* t = original_top; | |
| 2905 | |
| 2906 while (curhw < t) { | |
| 2907 oop cur = (oop)curhw; | |
| 2908 // We'll assume parallel for generality. This is rare code. | |
| 2909 concurrent_mark()->markAndGrayObjectIfNecessary(cur); // can't we just mark them? | |
| 2910 curhw = curhw + cur->size(); | |
| 2911 } | |
| 2912 assert(curhw == t, "Should have parsed correctly."); | |
| 2913 } | |
| 2914 if (G1PolicyVerbose > 1) { | |
| 2915 gclog_or_tty->print("New alloc region ["PTR_FORMAT", "PTR_FORMAT", " PTR_FORMAT") " | |
| 2916 "for survivors:", r->bottom(), original_top, r->end()); | |
| 2917 r->print(); | |
| 2918 } | |
| 2919 g1_policy()->record_before_bytes(r_used); | |
| 2920 } | |
| 2921 } | |
| 2922 | |
| 2923 void G1CollectedHeap::push_gc_alloc_region(HeapRegion* hr) { | |
| 2924 assert(Thread::current()->is_VM_thread() || | |
| 2925 par_alloc_during_gc_lock()->owned_by_self(), "Precondition"); | |
| 2926 assert(!hr->is_gc_alloc_region() && !hr->in_collection_set(), | |
| 2927 "Precondition."); | |
| 2928 hr->set_is_gc_alloc_region(true); | |
| 2929 hr->set_next_gc_alloc_region(_gc_alloc_region_list); | |
| 2930 _gc_alloc_region_list = hr; | |
| 2931 } | |
| 2932 | |
| 2933 #ifdef G1_DEBUG | |
| 2934 class FindGCAllocRegion: public HeapRegionClosure { | |
| 2935 public: | |
| 2936 bool doHeapRegion(HeapRegion* r) { | |
| 2937 if (r->is_gc_alloc_region()) { | |
| 2938 gclog_or_tty->print_cr("Region %d ["PTR_FORMAT"...] is still a gc_alloc_region.", | |
| 2939 r->hrs_index(), r->bottom()); | |
| 2940 } | |
| 2941 return false; | |
| 2942 } | |
| 2943 }; | |
| 2944 #endif // G1_DEBUG | |
| 2945 | |
| 2946 void G1CollectedHeap::forget_alloc_region_list() { | |
| 2947 assert(Thread::current()->is_VM_thread(), "Precondition"); | |
| 2948 while (_gc_alloc_region_list != NULL) { | |
| 2949 HeapRegion* r = _gc_alloc_region_list; | |
| 2950 assert(r->is_gc_alloc_region(), "Invariant."); | |
|
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2951 // We need HeapRegion::oops_on_card_seq_iterate_careful() to work on |
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2952 // newly allocated data in order to be able to apply deferred updates |
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2953 // before the GC is done for verification purposes (i.e to allow |
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2954 // G1HRRSFlushLogBuffersOnVerify). It's safe thing to do after the |
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2955 // collection. |
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2956 r->ContiguousSpace::set_saved_mark(); |
| 342 | 2957 _gc_alloc_region_list = r->next_gc_alloc_region(); |
| 2958 r->set_next_gc_alloc_region(NULL); | |
| 2959 r->set_is_gc_alloc_region(false); | |
| 545 | 2960 if (r->is_survivor()) { |
| 2961 if (r->is_empty()) { | |
| 2962 r->set_not_young(); | |
| 2963 } else { | |
| 2964 _young_list->add_survivor_region(r); | |
| 2965 } | |
| 2966 } | |
| 342 | 2967 if (r->is_empty()) { |
| 2968 ++_free_regions; | |
| 2969 } | |
| 2970 } | |
| 2971 #ifdef G1_DEBUG | |
| 2972 FindGCAllocRegion fa; | |
| 2973 heap_region_iterate(&fa); | |
| 2974 #endif // G1_DEBUG | |
| 2975 } | |
| 2976 | |
| 2977 | |
| 2978 bool G1CollectedHeap::check_gc_alloc_regions() { | |
| 2979 // TODO: allocation regions check | |
| 2980 return true; | |
| 2981 } | |
| 2982 | |
| 2983 void G1CollectedHeap::get_gc_alloc_regions() { | |
| 636 | 2984 // First, let's check that the GC alloc region list is empty (it should) |
| 2985 assert(_gc_alloc_region_list == NULL, "invariant"); | |
| 2986 | |
| 342 | 2987 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
| 636 | 2988 assert(_gc_alloc_regions[ap] == NULL, "invariant"); |
|
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2989 assert(_gc_alloc_region_counts[ap] == 0, "invariant"); |
| 636 | 2990 |
| 342 | 2991 // Create new GC alloc regions. |
| 636 | 2992 HeapRegion* alloc_region = _retained_gc_alloc_regions[ap]; |
| 2993 _retained_gc_alloc_regions[ap] = NULL; | |
| 2994 | |
| 2995 if (alloc_region != NULL) { | |
| 2996 assert(_retain_gc_alloc_region[ap], "only way to retain a GC region"); | |
| 2997 | |
| 2998 // let's make sure that the GC alloc region is not tagged as such | |
| 2999 // outside a GC operation | |
| 3000 assert(!alloc_region->is_gc_alloc_region(), "sanity"); | |
| 3001 | |
| 3002 if (alloc_region->in_collection_set() || | |
| 3003 alloc_region->top() == alloc_region->end() || | |
| 3004 alloc_region->top() == alloc_region->bottom()) { | |
| 3005 // we will discard the current GC alloc region if it's in the | |
| 3006 // collection set (it can happen!), if it's already full (no | |
| 3007 // point in using it), or if it's empty (this means that it | |
| 3008 // was emptied during a cleanup and it should be on the free | |
| 3009 // list now). | |
| 3010 | |
| 3011 alloc_region = NULL; | |
| 3012 } | |
| 3013 } | |
| 3014 | |
| 3015 if (alloc_region == NULL) { | |
| 3016 // we will get a new GC alloc region | |
| 342 | 3017 alloc_region = newAllocRegionWithExpansion(ap, 0); |
|
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3018 } else { |
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3019 // the region was retained from the last collection |
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3020 ++_gc_alloc_region_counts[ap]; |
| 342 | 3021 } |
| 636 | 3022 |
| 342 | 3023 if (alloc_region != NULL) { |
| 636 | 3024 assert(_gc_alloc_regions[ap] == NULL, "pre-condition"); |
| 342 | 3025 set_gc_alloc_region(ap, alloc_region); |
| 3026 } | |
| 636 | 3027 |
| 3028 assert(_gc_alloc_regions[ap] == NULL || | |
| 3029 _gc_alloc_regions[ap]->is_gc_alloc_region(), | |
| 3030 "the GC alloc region should be tagged as such"); | |
| 3031 assert(_gc_alloc_regions[ap] == NULL || | |
| 3032 _gc_alloc_regions[ap] == _gc_alloc_region_list, | |
| 3033 "the GC alloc region should be the same as the GC alloc list head"); | |
| 342 | 3034 } |
| 3035 // Set alternative regions for allocation purposes that have reached | |
| 636 | 3036 // their limit. |
| 342 | 3037 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
| 3038 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(ap); | |
| 3039 if (_gc_alloc_regions[ap] == NULL && alt_purpose != ap) { | |
| 3040 _gc_alloc_regions[ap] = _gc_alloc_regions[alt_purpose]; | |
| 3041 } | |
| 3042 } | |
| 3043 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
| 3044 } | |
| 3045 | |
| 636 | 3046 void G1CollectedHeap::release_gc_alloc_regions(bool totally) { |
| 342 | 3047 // We keep a separate list of all regions that have been alloc regions in |
| 636 | 3048 // the current collection pause. Forget that now. This method will |
| 3049 // untag the GC alloc regions and tear down the GC alloc region | |
| 3050 // list. It's desirable that no regions are tagged as GC alloc | |
| 3051 // outside GCs. | |
| 342 | 3052 forget_alloc_region_list(); |
| 3053 | |
| 3054 // The current alloc regions contain objs that have survived | |
| 3055 // collection. Make them no longer GC alloc regions. | |
| 3056 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 3057 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 636 | 3058 _retained_gc_alloc_regions[ap] = NULL; |
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3059 _gc_alloc_region_counts[ap] = 0; |
| 636 | 3060 |
| 3061 if (r != NULL) { | |
| 3062 // we retain nothing on _gc_alloc_regions between GCs | |
| 3063 set_gc_alloc_region(ap, NULL); | |
| 3064 | |
| 3065 if (r->is_empty()) { | |
| 3066 // we didn't actually allocate anything in it; let's just put | |
| 3067 // it on the free list | |
| 342 | 3068 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); |
| 3069 r->set_zero_fill_complete(); | |
| 3070 put_free_region_on_list_locked(r); | |
| 636 | 3071 } else if (_retain_gc_alloc_region[ap] && !totally) { |
| 3072 // retain it so that we can use it at the beginning of the next GC | |
| 3073 _retained_gc_alloc_regions[ap] = r; | |
| 342 | 3074 } |
| 3075 } | |
| 636 | 3076 } |
| 3077 } | |
| 3078 | |
| 3079 #ifndef PRODUCT | |
| 3080 // Useful for debugging | |
| 3081 | |
| 3082 void G1CollectedHeap::print_gc_alloc_regions() { | |
| 3083 gclog_or_tty->print_cr("GC alloc regions"); | |
| 3084 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 3085 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 3086 if (r == NULL) { | |
| 3087 gclog_or_tty->print_cr(" %2d : "PTR_FORMAT, ap, NULL); | |
| 3088 } else { | |
| 3089 gclog_or_tty->print_cr(" %2d : "PTR_FORMAT" "SIZE_FORMAT, | |
| 3090 ap, r->bottom(), r->used()); | |
| 3091 } | |
| 3092 } | |
| 3093 } | |
| 3094 #endif // PRODUCT | |
| 342 | 3095 |
| 3096 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
| 3097 _drain_in_progress = false; | |
| 3098 set_evac_failure_closure(cl); | |
| 3099 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 3100 } | |
| 3101 | |
| 3102 void G1CollectedHeap::finalize_for_evac_failure() { | |
| 3103 assert(_evac_failure_scan_stack != NULL && | |
| 3104 _evac_failure_scan_stack->length() == 0, | |
| 3105 "Postcondition"); | |
| 3106 assert(!_drain_in_progress, "Postcondition"); | |
| 3107 // Don't have to delete, since the scan stack is a resource object. | |
| 3108 _evac_failure_scan_stack = NULL; | |
| 3109 } | |
| 3110 | |
| 3111 | |
| 3112 | |
| 3113 // *** Sequential G1 Evacuation | |
| 3114 | |
| 3115 HeapWord* G1CollectedHeap::allocate_during_gc(GCAllocPurpose purpose, size_t word_size) { | |
| 3116 HeapRegion* alloc_region = _gc_alloc_regions[purpose]; | |
| 3117 // let the caller handle alloc failure | |
| 3118 if (alloc_region == NULL) return NULL; | |
| 3119 assert(isHumongous(word_size) || !alloc_region->isHumongous(), | |
| 3120 "Either the object is humongous or the region isn't"); | |
| 3121 HeapWord* block = alloc_region->allocate(word_size); | |
| 3122 if (block == NULL) { | |
| 3123 block = allocate_during_gc_slow(purpose, alloc_region, false, word_size); | |
| 3124 } | |
| 3125 return block; | |
| 3126 } | |
| 3127 | |
| 3128 class G1IsAliveClosure: public BoolObjectClosure { | |
| 3129 G1CollectedHeap* _g1; | |
| 3130 public: | |
| 3131 G1IsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
| 3132 void do_object(oop p) { assert(false, "Do not call."); } | |
| 3133 bool do_object_b(oop p) { | |
| 3134 // It is reachable if it is outside the collection set, or is inside | |
| 3135 // and forwarded. | |
| 3136 | |
| 3137 #ifdef G1_DEBUG | |
| 3138 gclog_or_tty->print_cr("is alive "PTR_FORMAT" in CS %d forwarded %d overall %d", | |
| 3139 (void*) p, _g1->obj_in_cs(p), p->is_forwarded(), | |
| 3140 !_g1->obj_in_cs(p) || p->is_forwarded()); | |
| 3141 #endif // G1_DEBUG | |
| 3142 | |
| 3143 return !_g1->obj_in_cs(p) || p->is_forwarded(); | |
| 3144 } | |
| 3145 }; | |
| 3146 | |
| 3147 class G1KeepAliveClosure: public OopClosure { | |
| 3148 G1CollectedHeap* _g1; | |
| 3149 public: | |
| 3150 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
|
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3151 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
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3152 void do_oop( oop* p) { |
| 342 | 3153 oop obj = *p; |
| 3154 #ifdef G1_DEBUG | |
| 3155 if (PrintGC && Verbose) { | |
| 3156 gclog_or_tty->print_cr("keep alive *"PTR_FORMAT" = "PTR_FORMAT" "PTR_FORMAT, | |
| 3157 p, (void*) obj, (void*) *p); | |
| 3158 } | |
| 3159 #endif // G1_DEBUG | |
| 3160 | |
| 3161 if (_g1->obj_in_cs(obj)) { | |
| 3162 assert( obj->is_forwarded(), "invariant" ); | |
| 3163 *p = obj->forwardee(); | |
| 3164 #ifdef G1_DEBUG | |
| 3165 gclog_or_tty->print_cr(" in CSet: moved "PTR_FORMAT" -> "PTR_FORMAT, | |
| 3166 (void*) obj, (void*) *p); | |
| 3167 #endif // G1_DEBUG | |
| 3168 } | |
| 3169 } | |
| 3170 }; | |
| 3171 | |
|
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3172 class UpdateRSetImmediate : public OopsInHeapRegionClosure { |
| 342 | 3173 private: |
| 3174 G1CollectedHeap* _g1; | |
| 3175 G1RemSet* _g1_rem_set; | |
| 3176 public: | |
|
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3177 UpdateRSetImmediate(G1CollectedHeap* g1) : |
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3178 _g1(g1), _g1_rem_set(g1->g1_rem_set()) {} |
| 342 | 3179 |
|
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3180 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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3181 virtual void do_oop( oop* p) { do_oop_work(p); } |
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3182 template <class T> void do_oop_work(T* p) { |
| 342 | 3183 assert(_from->is_in_reserved(p), "paranoia"); |
|
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3184 T heap_oop = oopDesc::load_heap_oop(p); |
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3185 if (!oopDesc::is_null(heap_oop) && !_from->is_survivor()) { |
|
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3186 _g1_rem_set->par_write_ref(_from, p, 0); |
| 342 | 3187 } |
| 3188 } | |
| 3189 }; | |
| 3190 | |
|
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3191 class UpdateRSetDeferred : public OopsInHeapRegionClosure { |
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3192 private: |
|
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3193 G1CollectedHeap* _g1; |
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3194 DirtyCardQueue *_dcq; |
|
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3195 CardTableModRefBS* _ct_bs; |
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3196 |
|
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3197 public: |
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3198 UpdateRSetDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
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3199 _g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) {} |
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3200 |
|
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3201 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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3202 virtual void do_oop( oop* p) { do_oop_work(p); } |
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3203 template <class T> void do_oop_work(T* p) { |
|
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3204 assert(_from->is_in_reserved(p), "paranoia"); |
|
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3205 if (!_from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && |
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3206 !_from->is_survivor()) { |
|
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3207 size_t card_index = _ct_bs->index_for(p); |
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3208 if (_ct_bs->mark_card_deferred(card_index)) { |
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3209 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
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3210 } |
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3211 } |
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3212 } |
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3213 }; |
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3214 |
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3215 |
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3216 |
| 342 | 3217 class RemoveSelfPointerClosure: public ObjectClosure { |
| 3218 private: | |
| 3219 G1CollectedHeap* _g1; | |
| 3220 ConcurrentMark* _cm; | |
| 3221 HeapRegion* _hr; | |
| 3222 size_t _prev_marked_bytes; | |
| 3223 size_t _next_marked_bytes; | |
|
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3224 OopsInHeapRegionClosure *_cl; |
| 342 | 3225 public: |
|
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3226 RemoveSelfPointerClosure(G1CollectedHeap* g1, OopsInHeapRegionClosure* cl) : |
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3227 _g1(g1), _cm(_g1->concurrent_mark()), _prev_marked_bytes(0), |
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3228 _next_marked_bytes(0), _cl(cl) {} |
| 342 | 3229 |
| 3230 size_t prev_marked_bytes() { return _prev_marked_bytes; } | |
| 3231 size_t next_marked_bytes() { return _next_marked_bytes; } | |
| 3232 | |
|
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3233 // The original idea here was to coalesce evacuated and dead objects. |
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3234 // However that caused complications with the block offset table (BOT). |
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3235 // In particular if there were two TLABs, one of them partially refined. |
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3236 // |----- TLAB_1--------|----TLAB_2-~~~(partially refined part)~~~| |
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3237 // The BOT entries of the unrefined part of TLAB_2 point to the start |
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3238 // of TLAB_2. If the last object of the TLAB_1 and the first object |
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3239 // of TLAB_2 are coalesced, then the cards of the unrefined part |
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3240 // would point into middle of the filler object. |
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3241 // |
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3242 // The current approach is to not coalesce and leave the BOT contents intact. |
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3243 void do_object(oop obj) { |
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3244 if (obj->is_forwarded() && obj->forwardee() == obj) { |
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3245 // The object failed to move. |
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3246 assert(!_g1->is_obj_dead(obj), "We should not be preserving dead objs."); |
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3247 _cm->markPrev(obj); |
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3248 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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3249 _prev_marked_bytes += (obj->size() * HeapWordSize); |
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3250 if (_g1->mark_in_progress() && !_g1->is_obj_ill(obj)) { |
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3251 _cm->markAndGrayObjectIfNecessary(obj); |
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3252 } |
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3253 obj->set_mark(markOopDesc::prototype()); |
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3254 // While we were processing RSet buffers during the |
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3255 // collection, we actually didn't scan any cards on the |
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3256 // collection set, since we didn't want to update remebered |
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3257 // sets with entries that point into the collection set, given |
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3258 // that live objects fromthe collection set are about to move |
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3259 // and such entries will be stale very soon. This change also |
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3260 // dealt with a reliability issue which involved scanning a |
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3261 // card in the collection set and coming across an array that |
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3262 // was being chunked and looking malformed. The problem is |
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3263 // that, if evacuation fails, we might have remembered set |
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3264 // entries missing given that we skipped cards on the |
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3265 // collection set. So, we'll recreate such entries now. |
|
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3266 obj->oop_iterate(_cl); |
|
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3267 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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3268 } else { |
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3269 // The object has been either evacuated or is dead. Fill it with a |
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3270 // dummy object. |
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3271 MemRegion mr((HeapWord*)obj, obj->size()); |
|
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3272 CollectedHeap::fill_with_object(mr); |
| 342 | 3273 _cm->clearRangeBothMaps(mr); |
| 3274 } | |
| 3275 } | |
| 3276 }; | |
| 3277 | |
| 3278 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
|
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3279 UpdateRSetImmediate immediate_update(_g1h); |
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3280 DirtyCardQueue dcq(&_g1h->dirty_card_queue_set()); |
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3281 UpdateRSetDeferred deferred_update(_g1h, &dcq); |
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3282 OopsInHeapRegionClosure *cl; |
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3283 if (G1DeferredRSUpdate) { |
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3284 cl = &deferred_update; |
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3285 } else { |
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3286 cl = &immediate_update; |
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3287 } |
| 342 | 3288 HeapRegion* cur = g1_policy()->collection_set(); |
| 3289 while (cur != NULL) { | |
| 3290 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
| 3291 | |
|
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3292 RemoveSelfPointerClosure rspc(_g1h, cl); |
| 342 | 3293 if (cur->evacuation_failed()) { |
| 3294 assert(cur->in_collection_set(), "bad CS"); | |
|
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3295 cl->set_region(cur); |
| 342 | 3296 cur->object_iterate(&rspc); |
| 3297 | |
| 3298 // A number of manipulations to make the TAMS be the current top, | |
| 3299 // and the marked bytes be the ones observed in the iteration. | |
| 3300 if (_g1h->concurrent_mark()->at_least_one_mark_complete()) { | |
| 3301 // The comments below are the postconditions achieved by the | |
| 3302 // calls. Note especially the last such condition, which says that | |
| 3303 // the count of marked bytes has been properly restored. | |
| 3304 cur->note_start_of_marking(false); | |
| 3305 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
| 3306 cur->add_to_marked_bytes(rspc.prev_marked_bytes()); | |
| 3307 // _next_marked_bytes == prev_marked_bytes. | |
| 3308 cur->note_end_of_marking(); | |
| 3309 // _prev_top_at_mark_start == top(), | |
| 3310 // _prev_marked_bytes == prev_marked_bytes | |
| 3311 } | |
| 3312 // If there is no mark in progress, we modified the _next variables | |
| 3313 // above needlessly, but harmlessly. | |
| 3314 if (_g1h->mark_in_progress()) { | |
| 3315 cur->note_start_of_marking(false); | |
| 3316 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
| 3317 // _next_marked_bytes == next_marked_bytes. | |
| 3318 } | |
| 3319 | |
| 3320 // Now make sure the region has the right index in the sorted array. | |
| 3321 g1_policy()->note_change_in_marked_bytes(cur); | |
| 3322 } | |
| 3323 cur = cur->next_in_collection_set(); | |
| 3324 } | |
| 3325 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
| 3326 | |
| 3327 // Now restore saved marks, if any. | |
| 3328 if (_objs_with_preserved_marks != NULL) { | |
| 3329 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
| 3330 assert(_objs_with_preserved_marks->length() == | |
| 3331 _preserved_marks_of_objs->length(), "Both or none."); | |
| 3332 guarantee(_objs_with_preserved_marks->length() == | |
| 3333 _preserved_marks_of_objs->length(), "Both or none."); | |
| 3334 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
| 3335 oop obj = _objs_with_preserved_marks->at(i); | |
| 3336 markOop m = _preserved_marks_of_objs->at(i); | |
| 3337 obj->set_mark(m); | |
| 3338 } | |
| 3339 // Delete the preserved marks growable arrays (allocated on the C heap). | |
| 3340 delete _objs_with_preserved_marks; | |
| 3341 delete _preserved_marks_of_objs; | |
| 3342 _objs_with_preserved_marks = NULL; | |
| 3343 _preserved_marks_of_objs = NULL; | |
| 3344 } | |
| 3345 } | |
| 3346 | |
| 3347 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
| 3348 _evac_failure_scan_stack->push(obj); | |
| 3349 } | |
| 3350 | |
| 3351 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
| 3352 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
| 3353 | |
| 3354 while (_evac_failure_scan_stack->length() > 0) { | |
| 3355 oop obj = _evac_failure_scan_stack->pop(); | |
| 3356 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
| 3357 obj->oop_iterate_backwards(_evac_failure_closure); | |
| 3358 } | |
| 3359 } | |
| 3360 | |
| 3361 void G1CollectedHeap::handle_evacuation_failure(oop old) { | |
| 3362 markOop m = old->mark(); | |
| 3363 // forward to self | |
| 3364 assert(!old->is_forwarded(), "precondition"); | |
| 3365 | |
| 3366 old->forward_to(old); | |
| 3367 handle_evacuation_failure_common(old, m); | |
| 3368 } | |
| 3369 | |
| 3370 oop | |
| 3371 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
| 3372 oop old) { | |
| 3373 markOop m = old->mark(); | |
| 3374 oop forward_ptr = old->forward_to_atomic(old); | |
| 3375 if (forward_ptr == NULL) { | |
| 3376 // Forward-to-self succeeded. | |
| 3377 if (_evac_failure_closure != cl) { | |
| 3378 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
| 3379 assert(!_drain_in_progress, | |
| 3380 "Should only be true while someone holds the lock."); | |
| 3381 // Set the global evac-failure closure to the current thread's. | |
| 3382 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
| 3383 set_evac_failure_closure(cl); | |
| 3384 // Now do the common part. | |
| 3385 handle_evacuation_failure_common(old, m); | |
| 3386 // Reset to NULL. | |
| 3387 set_evac_failure_closure(NULL); | |
| 3388 } else { | |
| 3389 // The lock is already held, and this is recursive. | |
| 3390 assert(_drain_in_progress, "This should only be the recursive case."); | |
| 3391 handle_evacuation_failure_common(old, m); | |
| 3392 } | |
| 3393 return old; | |
| 3394 } else { | |
| 3395 // Someone else had a place to copy it. | |
| 3396 return forward_ptr; | |
| 3397 } | |
| 3398 } | |
| 3399 | |
| 3400 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
| 3401 set_evacuation_failed(true); | |
| 3402 | |
| 3403 preserve_mark_if_necessary(old, m); | |
| 3404 | |
| 3405 HeapRegion* r = heap_region_containing(old); | |
| 3406 if (!r->evacuation_failed()) { | |
| 3407 r->set_evacuation_failed(true); | |
| 751 | 3408 if (G1PrintRegions) { |
| 342 | 3409 gclog_or_tty->print("evacuation failed in heap region "PTR_FORMAT" " |
| 3410 "["PTR_FORMAT","PTR_FORMAT")\n", | |
| 3411 r, r->bottom(), r->end()); | |
| 3412 } | |
| 3413 } | |
| 3414 | |
| 3415 push_on_evac_failure_scan_stack(old); | |
| 3416 | |
| 3417 if (!_drain_in_progress) { | |
| 3418 // prevent recursion in copy_to_survivor_space() | |
| 3419 _drain_in_progress = true; | |
| 3420 drain_evac_failure_scan_stack(); | |
| 3421 _drain_in_progress = false; | |
| 3422 } | |
| 3423 } | |
| 3424 | |
| 3425 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
| 3426 if (m != markOopDesc::prototype()) { | |
| 3427 if (_objs_with_preserved_marks == NULL) { | |
| 3428 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
| 3429 _objs_with_preserved_marks = | |
| 3430 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 3431 _preserved_marks_of_objs = | |
| 3432 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
| 3433 } | |
| 3434 _objs_with_preserved_marks->push(obj); | |
| 3435 _preserved_marks_of_objs->push(m); | |
| 3436 } | |
| 3437 } | |
| 3438 | |
| 3439 // *** Parallel G1 Evacuation | |
| 3440 | |
| 3441 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
| 3442 size_t word_size) { | |
| 3443 HeapRegion* alloc_region = _gc_alloc_regions[purpose]; | |
| 3444 // let the caller handle alloc failure | |
| 3445 if (alloc_region == NULL) return NULL; | |
| 3446 | |
| 3447 HeapWord* block = alloc_region->par_allocate(word_size); | |
| 3448 if (block == NULL) { | |
| 3449 MutexLockerEx x(par_alloc_during_gc_lock(), | |
| 3450 Mutex::_no_safepoint_check_flag); | |
| 3451 block = allocate_during_gc_slow(purpose, alloc_region, true, word_size); | |
| 3452 } | |
| 3453 return block; | |
| 3454 } | |
| 3455 | |
| 545 | 3456 void G1CollectedHeap::retire_alloc_region(HeapRegion* alloc_region, |
| 3457 bool par) { | |
| 3458 // Another thread might have obtained alloc_region for the given | |
| 3459 // purpose, and might be attempting to allocate in it, and might | |
| 3460 // succeed. Therefore, we can't do the "finalization" stuff on the | |
| 3461 // region below until we're sure the last allocation has happened. | |
| 3462 // We ensure this by allocating the remaining space with a garbage | |
| 3463 // object. | |
| 3464 if (par) par_allocate_remaining_space(alloc_region); | |
| 3465 // Now we can do the post-GC stuff on the region. | |
| 3466 alloc_region->note_end_of_copying(); | |
| 3467 g1_policy()->record_after_bytes(alloc_region->used()); | |
| 3468 } | |
| 3469 | |
| 342 | 3470 HeapWord* |
| 3471 G1CollectedHeap::allocate_during_gc_slow(GCAllocPurpose purpose, | |
| 3472 HeapRegion* alloc_region, | |
| 3473 bool par, | |
| 3474 size_t word_size) { | |
| 3475 HeapWord* block = NULL; | |
| 3476 // In the parallel case, a previous thread to obtain the lock may have | |
| 3477 // already assigned a new gc_alloc_region. | |
| 3478 if (alloc_region != _gc_alloc_regions[purpose]) { | |
| 3479 assert(par, "But should only happen in parallel case."); | |
| 3480 alloc_region = _gc_alloc_regions[purpose]; | |
| 3481 if (alloc_region == NULL) return NULL; | |
| 3482 block = alloc_region->par_allocate(word_size); | |
| 3483 if (block != NULL) return block; | |
| 3484 // Otherwise, continue; this new region is empty, too. | |
| 3485 } | |
| 3486 assert(alloc_region != NULL, "We better have an allocation region"); | |
| 545 | 3487 retire_alloc_region(alloc_region, par); |
| 342 | 3488 |
| 3489 if (_gc_alloc_region_counts[purpose] >= g1_policy()->max_regions(purpose)) { | |
| 3490 // Cannot allocate more regions for the given purpose. | |
| 3491 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(purpose); | |
| 3492 // Is there an alternative? | |
| 3493 if (purpose != alt_purpose) { | |
| 3494 HeapRegion* alt_region = _gc_alloc_regions[alt_purpose]; | |
| 3495 // Has not the alternative region been aliased? | |
| 545 | 3496 if (alloc_region != alt_region && alt_region != NULL) { |
| 342 | 3497 // Try to allocate in the alternative region. |
| 3498 if (par) { | |
| 3499 block = alt_region->par_allocate(word_size); | |
| 3500 } else { | |
| 3501 block = alt_region->allocate(word_size); | |
| 3502 } | |
| 3503 // Make an alias. | |
| 3504 _gc_alloc_regions[purpose] = _gc_alloc_regions[alt_purpose]; | |
| 545 | 3505 if (block != NULL) { |
| 3506 return block; | |
| 3507 } | |
| 3508 retire_alloc_region(alt_region, par); | |
| 342 | 3509 } |
| 3510 // Both the allocation region and the alternative one are full | |
| 3511 // and aliased, replace them with a new allocation region. | |
| 3512 purpose = alt_purpose; | |
| 3513 } else { | |
| 3514 set_gc_alloc_region(purpose, NULL); | |
| 3515 return NULL; | |
| 3516 } | |
| 3517 } | |
| 3518 | |
| 3519 // Now allocate a new region for allocation. | |
| 3520 alloc_region = newAllocRegionWithExpansion(purpose, word_size, false /*zero_filled*/); | |
| 3521 | |
| 3522 // let the caller handle alloc failure | |
| 3523 if (alloc_region != NULL) { | |
| 3524 | |
| 3525 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
| 3526 assert(alloc_region->saved_mark_at_top(), | |
| 3527 "Mark should have been saved already."); | |
| 3528 // We used to assert that the region was zero-filled here, but no | |
| 3529 // longer. | |
| 3530 | |
| 3531 // This must be done last: once it's installed, other regions may | |
| 3532 // allocate in it (without holding the lock.) | |
| 3533 set_gc_alloc_region(purpose, alloc_region); | |
| 3534 | |
| 3535 if (par) { | |
| 3536 block = alloc_region->par_allocate(word_size); | |
| 3537 } else { | |
| 3538 block = alloc_region->allocate(word_size); | |
| 3539 } | |
| 3540 // Caller handles alloc failure. | |
| 3541 } else { | |
| 3542 // This sets other apis using the same old alloc region to NULL, also. | |
| 3543 set_gc_alloc_region(purpose, NULL); | |
| 3544 } | |
| 3545 return block; // May be NULL. | |
| 3546 } | |
| 3547 | |
| 3548 void G1CollectedHeap::par_allocate_remaining_space(HeapRegion* r) { | |
| 3549 HeapWord* block = NULL; | |
| 3550 size_t free_words; | |
| 3551 do { | |
| 3552 free_words = r->free()/HeapWordSize; | |
| 3553 // If there's too little space, no one can allocate, so we're done. | |
| 3554 if (free_words < (size_t)oopDesc::header_size()) return; | |
| 3555 // Otherwise, try to claim it. | |
| 3556 block = r->par_allocate(free_words); | |
| 3557 } while (block == NULL); | |
|
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3558 fill_with_object(block, free_words); |
| 342 | 3559 } |
| 3560 | |
| 3561 #ifndef PRODUCT | |
| 3562 bool GCLabBitMapClosure::do_bit(size_t offset) { | |
| 3563 HeapWord* addr = _bitmap->offsetToHeapWord(offset); | |
| 3564 guarantee(_cm->isMarked(oop(addr)), "it should be!"); | |
| 3565 return true; | |
| 3566 } | |
| 3567 #endif // PRODUCT | |
| 3568 | |
|
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3569 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) |
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3570 : _g1h(g1h), |
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3571 _refs(g1h->task_queue(queue_num)), |
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3572 _dcq(&g1h->dirty_card_queue_set()), |
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3573 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
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3574 _g1_rem(g1h->g1_rem_set()), |
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3575 _hash_seed(17), _queue_num(queue_num), |
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3576 _term_attempts(0), |
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3577 _age_table(false), |
| 342 | 3578 #if G1_DETAILED_STATS |
|
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3579 _pushes(0), _pops(0), _steals(0), |
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3580 _steal_attempts(0), _overflow_pushes(0), |
| 342 | 3581 #endif |
|
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3582 _strong_roots_time(0), _term_time(0), |
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3583 _alloc_buffer_waste(0), _undo_waste(0) |
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3584 { |
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3585 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
|
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3586 // we "sacrifice" entry 0 to keep track of surviving bytes for |
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3587 // non-young regions (where the age is -1) |
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3588 // We also add a few elements at the beginning and at the end in |
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3589 // an attempt to eliminate cache contention |
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3590 size_t real_length = 1 + _g1h->g1_policy()->young_cset_length(); |
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3591 size_t array_length = PADDING_ELEM_NUM + |
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3592 real_length + |
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3593 PADDING_ELEM_NUM; |
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3594 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); |
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3595 if (_surviving_young_words_base == NULL) |
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3596 vm_exit_out_of_memory(array_length * sizeof(size_t), |
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3597 "Not enough space for young surv histo."); |
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3598 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; |
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3599 memset(_surviving_young_words, 0, real_length * sizeof(size_t)); |
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3600 |
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3601 _overflowed_refs = new OverflowQueue(10); |
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3602 |
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3603 _start = os::elapsedTime(); |
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3604 } |
| 342 | 3605 |
| 3606 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : | |
| 3607 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), | |
| 3608 _par_scan_state(par_scan_state) { } | |
| 3609 | |
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3610 template <class T> void G1ParCopyHelper::mark_forwardee(T* p) { |
| 342 | 3611 // This is called _after_ do_oop_work has been called, hence after |
| 3612 // the object has been relocated to its new location and *p points | |
| 3613 // to its new location. | |
| 3614 | |
|
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3615 T heap_oop = oopDesc::load_heap_oop(p); |
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3616 if (!oopDesc::is_null(heap_oop)) { |
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3617 oop obj = oopDesc::decode_heap_oop(heap_oop); |
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3618 assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj)), |
| 342 | 3619 "shouldn't still be in the CSet if evacuation didn't fail."); |
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3620 HeapWord* addr = (HeapWord*)obj; |
| 342 | 3621 if (_g1->is_in_g1_reserved(addr)) |
| 3622 _cm->grayRoot(oop(addr)); | |
| 3623 } | |
| 3624 } | |
| 3625 | |
| 3626 oop G1ParCopyHelper::copy_to_survivor_space(oop old) { | |
| 3627 size_t word_sz = old->size(); | |
| 3628 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
| 3629 // +1 to make the -1 indexes valid... | |
| 3630 int young_index = from_region->young_index_in_cset()+1; | |
| 3631 assert( (from_region->is_young() && young_index > 0) || | |
| 3632 (!from_region->is_young() && young_index == 0), "invariant" ); | |
| 3633 G1CollectorPolicy* g1p = _g1->g1_policy(); | |
| 3634 markOop m = old->mark(); | |
| 545 | 3635 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
| 3636 : m->age(); | |
| 3637 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
| 342 | 3638 word_sz); |
| 3639 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
| 3640 oop obj = oop(obj_ptr); | |
| 3641 | |
| 3642 if (obj_ptr == NULL) { | |
| 3643 // This will either forward-to-self, or detect that someone else has | |
| 3644 // installed a forwarding pointer. | |
| 3645 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
| 3646 return _g1->handle_evacuation_failure_par(cl, old); | |
| 3647 } | |
| 3648 | |
| 526 | 3649 // We're going to allocate linearly, so might as well prefetch ahead. |
| 3650 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
| 3651 | |
| 342 | 3652 oop forward_ptr = old->forward_to_atomic(obj); |
| 3653 if (forward_ptr == NULL) { | |
| 3654 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
| 526 | 3655 if (g1p->track_object_age(alloc_purpose)) { |
| 3656 // We could simply do obj->incr_age(). However, this causes a | |
| 3657 // performance issue. obj->incr_age() will first check whether | |
| 3658 // the object has a displaced mark by checking its mark word; | |
| 3659 // getting the mark word from the new location of the object | |
| 3660 // stalls. So, given that we already have the mark word and we | |
| 3661 // are about to install it anyway, it's better to increase the | |
| 3662 // age on the mark word, when the object does not have a | |
| 3663 // displaced mark word. We're not expecting many objects to have | |
| 3664 // a displaced marked word, so that case is not optimized | |
| 3665 // further (it could be...) and we simply call obj->incr_age(). | |
| 3666 | |
| 3667 if (m->has_displaced_mark_helper()) { | |
| 3668 // in this case, we have to install the mark word first, | |
| 3669 // otherwise obj looks to be forwarded (the old mark word, | |
| 3670 // which contains the forward pointer, was copied) | |
| 3671 obj->set_mark(m); | |
| 3672 obj->incr_age(); | |
| 3673 } else { | |
| 3674 m = m->incr_age(); | |
| 545 | 3675 obj->set_mark(m); |
| 526 | 3676 } |
| 545 | 3677 _par_scan_state->age_table()->add(obj, word_sz); |
| 3678 } else { | |
| 3679 obj->set_mark(m); | |
| 526 | 3680 } |
| 3681 | |
| 342 | 3682 // preserve "next" mark bit |
| 3683 if (_g1->mark_in_progress() && !_g1->is_obj_ill(old)) { | |
| 3684 if (!use_local_bitmaps || | |
| 3685 !_par_scan_state->alloc_buffer(alloc_purpose)->mark(obj_ptr)) { | |
| 3686 // if we couldn't mark it on the local bitmap (this happens when | |
| 3687 // the object was not allocated in the GCLab), we have to bite | |
| 3688 // the bullet and do the standard parallel mark | |
| 3689 _cm->markAndGrayObjectIfNecessary(obj); | |
| 3690 } | |
| 3691 #if 1 | |
| 3692 if (_g1->isMarkedNext(old)) { | |
| 3693 _cm->nextMarkBitMap()->parClear((HeapWord*)old); | |
| 3694 } | |
| 3695 #endif | |
| 3696 } | |
| 3697 | |
| 3698 size_t* surv_young_words = _par_scan_state->surviving_young_words(); | |
| 3699 surv_young_words[young_index] += word_sz; | |
| 3700 | |
| 3701 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
| 3702 arrayOop(old)->set_length(0); | |
|
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3703 oop* old_p = set_partial_array_mask(old); |
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3704 _par_scan_state->push_on_queue(old_p); |
| 342 | 3705 } else { |
| 526 | 3706 // No point in using the slower heap_region_containing() method, |
| 3707 // given that we know obj is in the heap. | |
| 3708 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
| 342 | 3709 obj->oop_iterate_backwards(_scanner); |
| 3710 } | |
| 3711 } else { | |
| 3712 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
| 3713 obj = forward_ptr; | |
| 3714 } | |
| 3715 return obj; | |
| 3716 } | |
| 3717 | |
|
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3718 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_forwardee, bool skip_cset_test> |
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3719 template <class T> |
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3720 void G1ParCopyClosure <do_gen_barrier, barrier, do_mark_forwardee, skip_cset_test> |
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3721 ::do_oop_work(T* p) { |
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3722 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 3723 assert(barrier != G1BarrierRS || obj != NULL, |
| 3724 "Precondition: G1BarrierRS implies obj is nonNull"); | |
| 3725 | |
| 526 | 3726 // The only time we skip the cset test is when we're scanning |
| 3727 // references popped from the queue. And we only push on the queue | |
| 3728 // references that we know point into the cset, so no point in | |
| 3729 // checking again. But we'll leave an assert here for peace of mind. | |
| 3730 assert(!skip_cset_test || _g1->obj_in_cs(obj), "invariant"); | |
| 3731 | |
| 3732 // here the null check is implicit in the cset_fast_test() test | |
| 3733 if (skip_cset_test || _g1->in_cset_fast_test(obj)) { | |
| 342 | 3734 #if G1_REM_SET_LOGGING |
| 526 | 3735 gclog_or_tty->print_cr("Loc "PTR_FORMAT" contains pointer "PTR_FORMAT" " |
| 3736 "into CS.", p, (void*) obj); | |
| 342 | 3737 #endif |
| 526 | 3738 if (obj->is_forwarded()) { |
|
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3739 oopDesc::encode_store_heap_oop(p, obj->forwardee()); |
| 526 | 3740 } else { |
|
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3741 oop copy_oop = copy_to_survivor_space(obj); |
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3742 oopDesc::encode_store_heap_oop(p, copy_oop); |
| 342 | 3743 } |
| 526 | 3744 // When scanning the RS, we only care about objs in CS. |
| 3745 if (barrier == G1BarrierRS) { | |
|
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3746 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 342 | 3747 } |
| 526 | 3748 } |
| 3749 | |
| 3750 // When scanning moved objs, must look at all oops. | |
| 3751 if (barrier == G1BarrierEvac && obj != NULL) { | |
|
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3752 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 526 | 3753 } |
| 3754 | |
| 3755 if (do_gen_barrier && obj != NULL) { | |
| 3756 par_do_barrier(p); | |
| 3757 } | |
| 3758 } | |
| 3759 | |
| 3760 template void G1ParCopyClosure<false, G1BarrierEvac, false, true>::do_oop_work(oop* p); | |
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3761 template void G1ParCopyClosure<false, G1BarrierEvac, false, true>::do_oop_work(narrowOop* p); |
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3762 |
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3763 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
| 526 | 3764 assert(has_partial_array_mask(p), "invariant"); |
| 3765 oop old = clear_partial_array_mask(p); | |
| 342 | 3766 assert(old->is_objArray(), "must be obj array"); |
| 3767 assert(old->is_forwarded(), "must be forwarded"); | |
| 3768 assert(Universe::heap()->is_in_reserved(old), "must be in heap."); | |
| 3769 | |
| 3770 objArrayOop obj = objArrayOop(old->forwardee()); | |
| 3771 assert((void*)old != (void*)old->forwardee(), "self forwarding here?"); | |
| 3772 // Process ParGCArrayScanChunk elements now | |
| 3773 // and push the remainder back onto queue | |
| 3774 int start = arrayOop(old)->length(); | |
| 3775 int end = obj->length(); | |
| 3776 int remainder = end - start; | |
| 3777 assert(start <= end, "just checking"); | |
| 3778 if (remainder > 2 * ParGCArrayScanChunk) { | |
| 3779 // Test above combines last partial chunk with a full chunk | |
| 3780 end = start + ParGCArrayScanChunk; | |
| 3781 arrayOop(old)->set_length(end); | |
| 3782 // Push remainder. | |
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3783 oop* old_p = set_partial_array_mask(old); |
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3784 assert(arrayOop(old)->length() < obj->length(), "Empty push?"); |
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3785 _par_scan_state->push_on_queue(old_p); |
| 342 | 3786 } else { |
| 3787 // Restore length so that the heap remains parsable in | |
| 3788 // case of evacuation failure. | |
| 3789 arrayOop(old)->set_length(end); | |
| 3790 } | |
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3791 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
| 342 | 3792 // process our set of indices (include header in first chunk) |
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3793 obj->oop_iterate_range(&_scanner, start, end); |
| 342 | 3794 } |
| 3795 | |
| 3796 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
| 3797 protected: | |
| 3798 G1CollectedHeap* _g1h; | |
| 3799 G1ParScanThreadState* _par_scan_state; | |
| 3800 RefToScanQueueSet* _queues; | |
| 3801 ParallelTaskTerminator* _terminator; | |
| 3802 | |
| 3803 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
| 3804 RefToScanQueueSet* queues() { return _queues; } | |
| 3805 ParallelTaskTerminator* terminator() { return _terminator; } | |
| 3806 | |
| 3807 public: | |
| 3808 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
| 3809 G1ParScanThreadState* par_scan_state, | |
| 3810 RefToScanQueueSet* queues, | |
| 3811 ParallelTaskTerminator* terminator) | |
| 3812 : _g1h(g1h), _par_scan_state(par_scan_state), | |
| 3813 _queues(queues), _terminator(terminator) {} | |
| 3814 | |
| 3815 void do_void() { | |
| 3816 G1ParScanThreadState* pss = par_scan_state(); | |
| 3817 while (true) { | |
| 3818 pss->trim_queue(); | |
| 3819 IF_G1_DETAILED_STATS(pss->note_steal_attempt()); | |
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3820 |
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3821 StarTask stolen_task; |
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3822 if (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
| 342 | 3823 IF_G1_DETAILED_STATS(pss->note_steal()); |
| 526 | 3824 |
| 3825 // slightly paranoid tests; I'm trying to catch potential | |
| 3826 // problems before we go into push_on_queue to know where the | |
| 3827 // problem is coming from | |
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3828 assert((oop*)stolen_task != NULL, "Error"); |
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3829 if (stolen_task.is_narrow()) { |
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3830 assert(UseCompressedOops, "Error"); |
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3831 narrowOop* p = (narrowOop*) stolen_task; |
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3832 assert(has_partial_array_mask(p) || |
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3833 _g1h->obj_in_cs(oopDesc::load_decode_heap_oop(p)), "Error"); |
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3834 pss->push_on_queue(p); |
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3835 } else { |
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3836 oop* p = (oop*) stolen_task; |
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3837 assert(has_partial_array_mask(p) || _g1h->obj_in_cs(*p), "Error"); |
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3838 pss->push_on_queue(p); |
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3839 } |
| 342 | 3840 continue; |
| 3841 } | |
| 3842 pss->start_term_time(); | |
| 3843 if (terminator()->offer_termination()) break; | |
| 3844 pss->end_term_time(); | |
| 3845 } | |
| 3846 pss->end_term_time(); | |
| 3847 pss->retire_alloc_buffers(); | |
| 3848 } | |
| 3849 }; | |
| 3850 | |
| 3851 class G1ParTask : public AbstractGangTask { | |
| 3852 protected: | |
| 3853 G1CollectedHeap* _g1h; | |
| 3854 RefToScanQueueSet *_queues; | |
| 3855 ParallelTaskTerminator _terminator; | |
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3856 int _n_workers; |
| 342 | 3857 |
| 3858 Mutex _stats_lock; | |
| 3859 Mutex* stats_lock() { return &_stats_lock; } | |
| 3860 | |
| 3861 size_t getNCards() { | |
| 3862 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
| 3863 / G1BlockOffsetSharedArray::N_bytes; | |
| 3864 } | |
| 3865 | |
| 3866 public: | |
| 3867 G1ParTask(G1CollectedHeap* g1h, int workers, RefToScanQueueSet *task_queues) | |
| 3868 : AbstractGangTask("G1 collection"), | |
| 3869 _g1h(g1h), | |
| 3870 _queues(task_queues), | |
| 3871 _terminator(workers, _queues), | |
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3872 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true), |
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3873 _n_workers(workers) |
| 342 | 3874 {} |
| 3875 | |
| 3876 RefToScanQueueSet* queues() { return _queues; } | |
| 3877 | |
| 3878 RefToScanQueue *work_queue(int i) { | |
| 3879 return queues()->queue(i); | |
| 3880 } | |
| 3881 | |
| 3882 void work(int i) { | |
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3883 if (i >= _n_workers) return; // no work needed this round |
| 342 | 3884 ResourceMark rm; |
| 3885 HandleMark hm; | |
| 3886 | |
| 526 | 3887 G1ParScanThreadState pss(_g1h, i); |
| 3888 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss); | |
| 3889 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss); | |
| 3890 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss); | |
| 342 | 3891 |
| 3892 pss.set_evac_closure(&scan_evac_cl); | |
| 3893 pss.set_evac_failure_closure(&evac_failure_cl); | |
| 3894 pss.set_partial_scan_closure(&partial_scan_cl); | |
| 3895 | |
| 3896 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss); | |
| 3897 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss); | |
| 3898 G1ParScanHeapRSClosure only_scan_heap_rs_cl(_g1h, &pss); | |
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3899 |
| 342 | 3900 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss); |
| 3901 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss); | |
| 3902 G1ParScanAndMarkHeapRSClosure scan_mark_heap_rs_cl(_g1h, &pss); | |
| 3903 | |
| 3904 OopsInHeapRegionClosure *scan_root_cl; | |
| 3905 OopsInHeapRegionClosure *scan_perm_cl; | |
| 3906 OopsInHeapRegionClosure *scan_so_cl; | |
| 3907 | |
| 3908 if (_g1h->g1_policy()->should_initiate_conc_mark()) { | |
| 3909 scan_root_cl = &scan_mark_root_cl; | |
| 3910 scan_perm_cl = &scan_mark_perm_cl; | |
| 3911 scan_so_cl = &scan_mark_heap_rs_cl; | |
| 3912 } else { | |
| 3913 scan_root_cl = &only_scan_root_cl; | |
| 3914 scan_perm_cl = &only_scan_perm_cl; | |
| 3915 scan_so_cl = &only_scan_heap_rs_cl; | |
| 3916 } | |
| 3917 | |
| 3918 pss.start_strong_roots(); | |
| 3919 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
| 3920 SharedHeap::SO_AllClasses, | |
| 3921 scan_root_cl, | |
| 3922 &only_scan_heap_rs_cl, | |
| 3923 scan_so_cl, | |
| 3924 scan_perm_cl, | |
| 3925 i); | |
| 3926 pss.end_strong_roots(); | |
| 3927 { | |
| 3928 double start = os::elapsedTime(); | |
| 3929 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
| 3930 evac.do_void(); | |
| 3931 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
| 3932 double term_ms = pss.term_time()*1000.0; | |
| 3933 _g1h->g1_policy()->record_obj_copy_time(i, elapsed_ms-term_ms); | |
| 3934 _g1h->g1_policy()->record_termination_time(i, term_ms); | |
| 3935 } | |
| 751 | 3936 if (G1UseSurvivorSpaces) { |
| 545 | 3937 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
| 3938 } | |
| 342 | 3939 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
| 3940 | |
| 3941 // Clean up any par-expanded rem sets. | |
| 3942 HeapRegionRemSet::par_cleanup(); | |
| 3943 | |
| 3944 MutexLocker x(stats_lock()); | |
| 3945 if (ParallelGCVerbose) { | |
| 3946 gclog_or_tty->print("Thread %d complete:\n", i); | |
| 3947 #if G1_DETAILED_STATS | |
| 3948 gclog_or_tty->print(" Pushes: %7d Pops: %7d Overflows: %7d Steals %7d (in %d attempts)\n", | |
| 3949 pss.pushes(), | |
| 3950 pss.pops(), | |
| 3951 pss.overflow_pushes(), | |
| 3952 pss.steals(), | |
| 3953 pss.steal_attempts()); | |
| 3954 #endif | |
| 3955 double elapsed = pss.elapsed(); | |
| 3956 double strong_roots = pss.strong_roots_time(); | |
| 3957 double term = pss.term_time(); | |
| 3958 gclog_or_tty->print(" Elapsed: %7.2f ms.\n" | |
| 3959 " Strong roots: %7.2f ms (%6.2f%%)\n" | |
| 3960 " Termination: %7.2f ms (%6.2f%%) (in %d entries)\n", | |
| 3961 elapsed * 1000.0, | |
| 3962 strong_roots * 1000.0, (strong_roots*100.0/elapsed), | |
| 3963 term * 1000.0, (term*100.0/elapsed), | |
| 3964 pss.term_attempts()); | |
| 3965 size_t total_waste = pss.alloc_buffer_waste() + pss.undo_waste(); | |
| 3966 gclog_or_tty->print(" Waste: %8dK\n" | |
| 3967 " Alloc Buffer: %8dK\n" | |
| 3968 " Undo: %8dK\n", | |
| 3969 (total_waste * HeapWordSize) / K, | |
| 3970 (pss.alloc_buffer_waste() * HeapWordSize) / K, | |
| 3971 (pss.undo_waste() * HeapWordSize) / K); | |
| 3972 } | |
| 3973 | |
| 3974 assert(pss.refs_to_scan() == 0, "Task queue should be empty"); | |
| 3975 assert(pss.overflowed_refs_to_scan() == 0, "Overflow queue should be empty"); | |
| 3976 } | |
| 3977 }; | |
| 3978 | |
| 3979 // *** Common G1 Evacuation Stuff | |
| 3980 | |
| 3981 void | |
| 3982 G1CollectedHeap:: | |
| 3983 g1_process_strong_roots(bool collecting_perm_gen, | |
| 3984 SharedHeap::ScanningOption so, | |
| 3985 OopClosure* scan_non_heap_roots, | |
| 3986 OopsInHeapRegionClosure* scan_rs, | |
| 3987 OopsInHeapRegionClosure* scan_so, | |
| 3988 OopsInGenClosure* scan_perm, | |
| 3989 int worker_i) { | |
| 3990 // First scan the strong roots, including the perm gen. | |
| 3991 double ext_roots_start = os::elapsedTime(); | |
| 3992 double closure_app_time_sec = 0.0; | |
| 3993 | |
| 3994 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
| 3995 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
| 3996 buf_scan_perm.set_generation(perm_gen()); | |
| 3997 | |
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3998 // Walk the code cache w/o buffering, because StarTask cannot handle |
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3999 // unaligned oop locations. |
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4000 CodeBlobToOopClosure eager_scan_code_roots(scan_non_heap_roots, /*do_marking=*/ true); |
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4001 |
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4002 process_strong_roots(false, // no scoping; this is parallel code |
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4003 collecting_perm_gen, so, |
| 342 | 4004 &buf_scan_non_heap_roots, |
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4005 &eager_scan_code_roots, |
| 342 | 4006 &buf_scan_perm); |
| 4007 // Finish up any enqueued closure apps. | |
| 4008 buf_scan_non_heap_roots.done(); | |
| 4009 buf_scan_perm.done(); | |
| 4010 double ext_roots_end = os::elapsedTime(); | |
| 4011 g1_policy()->reset_obj_copy_time(worker_i); | |
| 4012 double obj_copy_time_sec = | |
| 4013 buf_scan_non_heap_roots.closure_app_seconds() + | |
| 4014 buf_scan_perm.closure_app_seconds(); | |
| 4015 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); | |
| 4016 double ext_root_time_ms = | |
| 4017 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
| 4018 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); | |
| 4019 | |
| 4020 // Scan strong roots in mark stack. | |
| 4021 if (!_process_strong_tasks->is_task_claimed(G1H_PS_mark_stack_oops_do)) { | |
| 4022 concurrent_mark()->oops_do(scan_non_heap_roots); | |
| 4023 } | |
| 4024 double mark_stack_scan_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; | |
| 4025 g1_policy()->record_mark_stack_scan_time(worker_i, mark_stack_scan_ms); | |
| 4026 | |
| 4027 // XXX What should this be doing in the parallel case? | |
| 4028 g1_policy()->record_collection_pause_end_CH_strong_roots(); | |
| 4029 if (scan_so != NULL) { | |
| 4030 scan_scan_only_set(scan_so, worker_i); | |
| 4031 } | |
| 4032 // Now scan the complement of the collection set. | |
| 4033 if (scan_rs != NULL) { | |
| 4034 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
| 4035 } | |
| 4036 // Finish with the ref_processor roots. | |
| 4037 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { | |
| 4038 ref_processor()->oops_do(scan_non_heap_roots); | |
| 4039 } | |
| 4040 g1_policy()->record_collection_pause_end_G1_strong_roots(); | |
| 4041 _process_strong_tasks->all_tasks_completed(); | |
| 4042 } | |
| 4043 | |
| 4044 void | |
| 4045 G1CollectedHeap::scan_scan_only_region(HeapRegion* r, | |
| 4046 OopsInHeapRegionClosure* oc, | |
| 4047 int worker_i) { | |
| 4048 HeapWord* startAddr = r->bottom(); | |
| 4049 HeapWord* endAddr = r->used_region().end(); | |
| 4050 | |
| 4051 oc->set_region(r); | |
| 4052 | |
| 4053 HeapWord* p = r->bottom(); | |
| 4054 HeapWord* t = r->top(); | |
| 4055 guarantee( p == r->next_top_at_mark_start(), "invariant" ); | |
| 4056 while (p < t) { | |
| 4057 oop obj = oop(p); | |
| 4058 p += obj->oop_iterate(oc); | |
| 4059 } | |
| 4060 } | |
| 4061 | |
| 4062 void | |
| 4063 G1CollectedHeap::scan_scan_only_set(OopsInHeapRegionClosure* oc, | |
| 4064 int worker_i) { | |
| 4065 double start = os::elapsedTime(); | |
| 4066 | |
| 4067 BufferingOopsInHeapRegionClosure boc(oc); | |
| 4068 | |
| 4069 FilterInHeapRegionAndIntoCSClosure scan_only(this, &boc); | |
| 4070 FilterAndMarkInHeapRegionAndIntoCSClosure scan_and_mark(this, &boc, concurrent_mark()); | |
| 4071 | |
| 4072 OopsInHeapRegionClosure *foc; | |
| 4073 if (g1_policy()->should_initiate_conc_mark()) | |
| 4074 foc = &scan_and_mark; | |
| 4075 else | |
| 4076 foc = &scan_only; | |
| 4077 | |
| 4078 HeapRegion* hr; | |
| 4079 int n = 0; | |
| 4080 while ((hr = _young_list->par_get_next_scan_only_region()) != NULL) { | |
| 4081 scan_scan_only_region(hr, foc, worker_i); | |
| 4082 ++n; | |
| 4083 } | |
| 4084 boc.done(); | |
| 4085 | |
| 4086 double closure_app_s = boc.closure_app_seconds(); | |
| 4087 g1_policy()->record_obj_copy_time(worker_i, closure_app_s * 1000.0); | |
| 4088 double ms = (os::elapsedTime() - start - closure_app_s)*1000.0; | |
| 4089 g1_policy()->record_scan_only_time(worker_i, ms, n); | |
| 4090 } | |
| 4091 | |
| 4092 void | |
| 4093 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
| 4094 OopClosure* non_root_closure) { | |
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4095 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
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4096 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
| 342 | 4097 } |
| 4098 | |
| 4099 | |
| 4100 class SaveMarksClosure: public HeapRegionClosure { | |
| 4101 public: | |
| 4102 bool doHeapRegion(HeapRegion* r) { | |
| 4103 r->save_marks(); | |
| 4104 return false; | |
| 4105 } | |
| 4106 }; | |
| 4107 | |
| 4108 void G1CollectedHeap::save_marks() { | |
| 4109 if (ParallelGCThreads == 0) { | |
| 4110 SaveMarksClosure sm; | |
| 4111 heap_region_iterate(&sm); | |
| 4112 } | |
| 4113 // We do this even in the parallel case | |
| 4114 perm_gen()->save_marks(); | |
| 4115 } | |
| 4116 | |
| 4117 void G1CollectedHeap::evacuate_collection_set() { | |
| 4118 set_evacuation_failed(false); | |
| 4119 | |
| 4120 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
| 4121 concurrent_g1_refine()->set_use_cache(false); | |
| 889 | 4122 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
| 4123 | |
| 342 | 4124 int n_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); |
| 4125 set_par_threads(n_workers); | |
| 4126 G1ParTask g1_par_task(this, n_workers, _task_queues); | |
| 4127 | |
| 4128 init_for_evac_failure(NULL); | |
| 4129 | |
| 4130 rem_set()->prepare_for_younger_refs_iterate(true); | |
|
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4131 |
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4132 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
| 342 | 4133 double start_par = os::elapsedTime(); |
| 4134 if (ParallelGCThreads > 0) { | |
| 4135 // The individual threads will set their evac-failure closures. | |
|
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4136 StrongRootsScope srs(this); |
| 342 | 4137 workers()->run_task(&g1_par_task); |
| 4138 } else { | |
|
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4139 StrongRootsScope srs(this); |
| 342 | 4140 g1_par_task.work(0); |
| 4141 } | |
| 4142 | |
| 4143 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
| 4144 g1_policy()->record_par_time(par_time); | |
| 4145 set_par_threads(0); | |
| 4146 // Is this the right thing to do here? We don't save marks | |
| 4147 // on individual heap regions when we allocate from | |
| 4148 // them in parallel, so this seems like the correct place for this. | |
| 545 | 4149 retire_all_alloc_regions(); |
| 342 | 4150 { |
| 4151 G1IsAliveClosure is_alive(this); | |
| 4152 G1KeepAliveClosure keep_alive(this); | |
| 4153 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
| 4154 } | |
| 4155 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); | |
|
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4156 |
| 889 | 4157 concurrent_g1_refine()->clear_hot_cache(); |
| 342 | 4158 concurrent_g1_refine()->set_use_cache(true); |
| 4159 | |
| 4160 finalize_for_evac_failure(); | |
| 4161 | |
| 4162 // Must do this before removing self-forwarding pointers, which clears | |
| 4163 // the per-region evac-failure flags. | |
| 4164 concurrent_mark()->complete_marking_in_collection_set(); | |
| 4165 | |
| 4166 if (evacuation_failed()) { | |
| 4167 remove_self_forwarding_pointers(); | |
| 4168 if (PrintGCDetails) { | |
| 4169 gclog_or_tty->print(" (evacuation failed)"); | |
| 4170 } else if (PrintGC) { | |
| 4171 gclog_or_tty->print("--"); | |
| 4172 } | |
| 4173 } | |
| 4174 | |
|
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4175 if (G1DeferredRSUpdate) { |
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4176 RedirtyLoggedCardTableEntryFastClosure redirty; |
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4177 dirty_card_queue_set().set_closure(&redirty); |
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4178 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
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4179 JavaThread::dirty_card_queue_set().merge_bufferlists(&dirty_card_queue_set()); |
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4180 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
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4181 } |
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4182 |
| 342 | 4183 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
| 4184 } | |
| 4185 | |
| 4186 void G1CollectedHeap::free_region(HeapRegion* hr) { | |
| 4187 size_t pre_used = 0; | |
| 4188 size_t cleared_h_regions = 0; | |
| 4189 size_t freed_regions = 0; | |
| 4190 UncleanRegionList local_list; | |
| 4191 | |
| 4192 HeapWord* start = hr->bottom(); | |
| 4193 HeapWord* end = hr->prev_top_at_mark_start(); | |
| 4194 size_t used_bytes = hr->used(); | |
| 4195 size_t live_bytes = hr->max_live_bytes(); | |
| 4196 if (used_bytes > 0) { | |
| 4197 guarantee( live_bytes <= used_bytes, "invariant" ); | |
| 4198 } else { | |
| 4199 guarantee( live_bytes == 0, "invariant" ); | |
| 4200 } | |
| 4201 | |
| 4202 size_t garbage_bytes = used_bytes - live_bytes; | |
| 4203 if (garbage_bytes > 0) | |
| 4204 g1_policy()->decrease_known_garbage_bytes(garbage_bytes); | |
| 4205 | |
| 4206 free_region_work(hr, pre_used, cleared_h_regions, freed_regions, | |
| 4207 &local_list); | |
| 4208 finish_free_region_work(pre_used, cleared_h_regions, freed_regions, | |
| 4209 &local_list); | |
| 4210 } | |
| 4211 | |
| 4212 void | |
| 4213 G1CollectedHeap::free_region_work(HeapRegion* hr, | |
| 4214 size_t& pre_used, | |
| 4215 size_t& cleared_h_regions, | |
| 4216 size_t& freed_regions, | |
| 4217 UncleanRegionList* list, | |
| 4218 bool par) { | |
| 4219 pre_used += hr->used(); | |
| 4220 if (hr->isHumongous()) { | |
| 4221 assert(hr->startsHumongous(), | |
| 4222 "Only the start of a humongous region should be freed."); | |
| 4223 int ind = _hrs->find(hr); | |
| 4224 assert(ind != -1, "Should have an index."); | |
| 4225 // Clear the start region. | |
| 4226 hr->hr_clear(par, true /*clear_space*/); | |
| 4227 list->insert_before_head(hr); | |
| 4228 cleared_h_regions++; | |
| 4229 freed_regions++; | |
| 4230 // Clear any continued regions. | |
| 4231 ind++; | |
| 4232 while ((size_t)ind < n_regions()) { | |
| 4233 HeapRegion* hrc = _hrs->at(ind); | |
| 4234 if (!hrc->continuesHumongous()) break; | |
| 4235 // Otherwise, does continue the H region. | |
| 4236 assert(hrc->humongous_start_region() == hr, "Huh?"); | |
| 4237 hrc->hr_clear(par, true /*clear_space*/); | |
| 4238 cleared_h_regions++; | |
| 4239 freed_regions++; | |
| 4240 list->insert_before_head(hrc); | |
| 4241 ind++; | |
| 4242 } | |
| 4243 } else { | |
| 4244 hr->hr_clear(par, true /*clear_space*/); | |
| 4245 list->insert_before_head(hr); | |
| 4246 freed_regions++; | |
| 4247 // If we're using clear2, this should not be enabled. | |
| 4248 // assert(!hr->in_cohort(), "Can't be both free and in a cohort."); | |
| 4249 } | |
| 4250 } | |
| 4251 | |
| 4252 void G1CollectedHeap::finish_free_region_work(size_t pre_used, | |
| 4253 size_t cleared_h_regions, | |
| 4254 size_t freed_regions, | |
| 4255 UncleanRegionList* list) { | |
| 4256 if (list != NULL && list->sz() > 0) { | |
| 4257 prepend_region_list_on_unclean_list(list); | |
| 4258 } | |
| 4259 // Acquire a lock, if we're parallel, to update possibly-shared | |
| 4260 // variables. | |
| 4261 Mutex* lock = (n_par_threads() > 0) ? ParGCRareEvent_lock : NULL; | |
| 4262 { | |
| 4263 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); | |
| 4264 _summary_bytes_used -= pre_used; | |
| 4265 _num_humongous_regions -= (int) cleared_h_regions; | |
| 4266 _free_regions += freed_regions; | |
| 4267 } | |
| 4268 } | |
| 4269 | |
| 4270 | |
| 4271 void G1CollectedHeap::dirtyCardsForYoungRegions(CardTableModRefBS* ct_bs, HeapRegion* list) { | |
| 4272 while (list != NULL) { | |
| 4273 guarantee( list->is_young(), "invariant" ); | |
| 4274 | |
| 4275 HeapWord* bottom = list->bottom(); | |
| 4276 HeapWord* end = list->end(); | |
| 4277 MemRegion mr(bottom, end); | |
| 4278 ct_bs->dirty(mr); | |
| 4279 | |
| 4280 list = list->get_next_young_region(); | |
| 4281 } | |
| 4282 } | |
| 4283 | |
|
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4284 |
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4285 class G1ParCleanupCTTask : public AbstractGangTask { |
|
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4286 CardTableModRefBS* _ct_bs; |
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4287 G1CollectedHeap* _g1h; |
|
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4288 public: |
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4289 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
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4290 G1CollectedHeap* g1h) : |
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4291 AbstractGangTask("G1 Par Cleanup CT Task"), |
|
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4292 _ct_bs(ct_bs), |
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4293 _g1h(g1h) |
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4294 { } |
|
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4295 |
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4296 void work(int i) { |
|
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|
4297 HeapRegion* r; |
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4298 while (r = _g1h->pop_dirty_cards_region()) { |
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|
4299 clear_cards(r); |
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4300 } |
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4301 } |
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4302 void clear_cards(HeapRegion* r) { |
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4303 // Cards for Survivor and Scan-Only regions will be dirtied later. |
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4304 if (!r->is_scan_only() && !r->is_survivor()) { |
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4305 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
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4306 } |
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4307 } |
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|
4308 }; |
|
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4309 |
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|
4310 |
| 342 | 4311 void G1CollectedHeap::cleanUpCardTable() { |
| 4312 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
| 4313 double start = os::elapsedTime(); | |
| 4314 | |
|
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4315 // Iterate over the dirty cards region list. |
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4316 G1ParCleanupCTTask cleanup_task(ct_bs, this); |
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4317 if (ParallelGCThreads > 0) { |
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4318 set_par_threads(workers()->total_workers()); |
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4319 workers()->run_task(&cleanup_task); |
|
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4320 set_par_threads(0); |
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4321 } else { |
|
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4322 while (_dirty_cards_region_list) { |
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4323 HeapRegion* r = _dirty_cards_region_list; |
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4324 cleanup_task.clear_cards(r); |
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4325 _dirty_cards_region_list = r->get_next_dirty_cards_region(); |
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4326 if (_dirty_cards_region_list == r) { |
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4327 // The last region. |
|
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4328 _dirty_cards_region_list = NULL; |
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4329 } |
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4330 r->set_next_dirty_cards_region(NULL); |
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4331 } |
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4332 } |
| 342 | 4333 // now, redirty the cards of the scan-only and survivor regions |
| 4334 // (it seemed faster to do it this way, instead of iterating over | |
|
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4335 // all regions and then clearing / dirtying as appropriate) |
| 342 | 4336 dirtyCardsForYoungRegions(ct_bs, _young_list->first_scan_only_region()); |
| 4337 dirtyCardsForYoungRegions(ct_bs, _young_list->first_survivor_region()); | |
| 4338 | |
| 4339 double elapsed = os::elapsedTime() - start; | |
| 4340 g1_policy()->record_clear_ct_time( elapsed * 1000.0); | |
| 4341 } | |
| 4342 | |
| 4343 | |
| 4344 void G1CollectedHeap::do_collection_pause_if_appropriate(size_t word_size) { | |
| 4345 if (g1_policy()->should_do_collection_pause(word_size)) { | |
| 4346 do_collection_pause(); | |
| 4347 } | |
| 4348 } | |
| 4349 | |
| 4350 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
| 4351 double young_time_ms = 0.0; | |
| 4352 double non_young_time_ms = 0.0; | |
| 4353 | |
| 4354 G1CollectorPolicy* policy = g1_policy(); | |
| 4355 | |
| 4356 double start_sec = os::elapsedTime(); | |
| 4357 bool non_young = true; | |
| 4358 | |
| 4359 HeapRegion* cur = cs_head; | |
| 4360 int age_bound = -1; | |
| 4361 size_t rs_lengths = 0; | |
| 4362 | |
| 4363 while (cur != NULL) { | |
| 4364 if (non_young) { | |
| 4365 if (cur->is_young()) { | |
| 4366 double end_sec = os::elapsedTime(); | |
| 4367 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 4368 non_young_time_ms += elapsed_ms; | |
| 4369 | |
| 4370 start_sec = os::elapsedTime(); | |
| 4371 non_young = false; | |
| 4372 } | |
| 4373 } else { | |
| 4374 if (!cur->is_on_free_list()) { | |
| 4375 double end_sec = os::elapsedTime(); | |
| 4376 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 4377 young_time_ms += elapsed_ms; | |
| 4378 | |
| 4379 start_sec = os::elapsedTime(); | |
| 4380 non_young = true; | |
| 4381 } | |
| 4382 } | |
| 4383 | |
| 4384 rs_lengths += cur->rem_set()->occupied(); | |
| 4385 | |
| 4386 HeapRegion* next = cur->next_in_collection_set(); | |
| 4387 assert(cur->in_collection_set(), "bad CS"); | |
| 4388 cur->set_next_in_collection_set(NULL); | |
| 4389 cur->set_in_collection_set(false); | |
| 4390 | |
| 4391 if (cur->is_young()) { | |
| 4392 int index = cur->young_index_in_cset(); | |
| 4393 guarantee( index != -1, "invariant" ); | |
| 4394 guarantee( (size_t)index < policy->young_cset_length(), "invariant" ); | |
| 4395 size_t words_survived = _surviving_young_words[index]; | |
| 4396 cur->record_surv_words_in_group(words_survived); | |
| 4397 } else { | |
| 4398 int index = cur->young_index_in_cset(); | |
| 4399 guarantee( index == -1, "invariant" ); | |
| 4400 } | |
| 4401 | |
| 4402 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
| 4403 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
| 4404 "invariant" ); | |
| 4405 | |
| 4406 if (!cur->evacuation_failed()) { | |
| 4407 // And the region is empty. | |
| 4408 assert(!cur->is_empty(), | |
| 4409 "Should not have empty regions in a CS."); | |
| 4410 free_region(cur); | |
| 4411 } else { | |
| 4412 guarantee( !cur->is_scan_only(), "should not be scan only" ); | |
| 4413 cur->uninstall_surv_rate_group(); | |
| 4414 if (cur->is_young()) | |
| 4415 cur->set_young_index_in_cset(-1); | |
| 4416 cur->set_not_young(); | |
| 4417 cur->set_evacuation_failed(false); | |
| 4418 } | |
| 4419 cur = next; | |
| 4420 } | |
| 4421 | |
| 4422 policy->record_max_rs_lengths(rs_lengths); | |
| 4423 policy->cset_regions_freed(); | |
| 4424 | |
| 4425 double end_sec = os::elapsedTime(); | |
| 4426 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 4427 if (non_young) | |
| 4428 non_young_time_ms += elapsed_ms; | |
| 4429 else | |
| 4430 young_time_ms += elapsed_ms; | |
| 4431 | |
| 4432 policy->record_young_free_cset_time_ms(young_time_ms); | |
| 4433 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
| 4434 } | |
| 4435 | |
| 4436 HeapRegion* | |
| 4437 G1CollectedHeap::alloc_region_from_unclean_list_locked(bool zero_filled) { | |
| 4438 assert(ZF_mon->owned_by_self(), "Precondition"); | |
| 4439 HeapRegion* res = pop_unclean_region_list_locked(); | |
| 4440 if (res != NULL) { | |
| 4441 assert(!res->continuesHumongous() && | |
| 4442 res->zero_fill_state() != HeapRegion::Allocated, | |
| 4443 "Only free regions on unclean list."); | |
| 4444 if (zero_filled) { | |
| 4445 res->ensure_zero_filled_locked(); | |
| 4446 res->set_zero_fill_allocated(); | |
| 4447 } | |
| 4448 } | |
| 4449 return res; | |
| 4450 } | |
| 4451 | |
| 4452 HeapRegion* G1CollectedHeap::alloc_region_from_unclean_list(bool zero_filled) { | |
| 4453 MutexLockerEx zx(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4454 return alloc_region_from_unclean_list_locked(zero_filled); | |
| 4455 } | |
| 4456 | |
| 4457 void G1CollectedHeap::put_region_on_unclean_list(HeapRegion* r) { | |
| 4458 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4459 put_region_on_unclean_list_locked(r); | |
| 4460 if (should_zf()) ZF_mon->notify_all(); // Wake up ZF thread. | |
| 4461 } | |
| 4462 | |
| 4463 void G1CollectedHeap::set_unclean_regions_coming(bool b) { | |
| 4464 MutexLockerEx x(Cleanup_mon); | |
| 4465 set_unclean_regions_coming_locked(b); | |
| 4466 } | |
| 4467 | |
| 4468 void G1CollectedHeap::set_unclean_regions_coming_locked(bool b) { | |
| 4469 assert(Cleanup_mon->owned_by_self(), "Precondition"); | |
| 4470 _unclean_regions_coming = b; | |
| 4471 // Wake up mutator threads that might be waiting for completeCleanup to | |
| 4472 // finish. | |
| 4473 if (!b) Cleanup_mon->notify_all(); | |
| 4474 } | |
| 4475 | |
| 4476 void G1CollectedHeap::wait_for_cleanup_complete() { | |
| 4477 MutexLockerEx x(Cleanup_mon); | |
| 4478 wait_for_cleanup_complete_locked(); | |
| 4479 } | |
| 4480 | |
| 4481 void G1CollectedHeap::wait_for_cleanup_complete_locked() { | |
| 4482 assert(Cleanup_mon->owned_by_self(), "precondition"); | |
| 4483 while (_unclean_regions_coming) { | |
| 4484 Cleanup_mon->wait(); | |
| 4485 } | |
| 4486 } | |
| 4487 | |
| 4488 void | |
| 4489 G1CollectedHeap::put_region_on_unclean_list_locked(HeapRegion* r) { | |
| 4490 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4491 _unclean_region_list.insert_before_head(r); | |
| 4492 } | |
| 4493 | |
| 4494 void | |
| 4495 G1CollectedHeap::prepend_region_list_on_unclean_list(UncleanRegionList* list) { | |
| 4496 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4497 prepend_region_list_on_unclean_list_locked(list); | |
| 4498 if (should_zf()) ZF_mon->notify_all(); // Wake up ZF thread. | |
| 4499 } | |
| 4500 | |
| 4501 void | |
| 4502 G1CollectedHeap:: | |
| 4503 prepend_region_list_on_unclean_list_locked(UncleanRegionList* list) { | |
| 4504 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4505 _unclean_region_list.prepend_list(list); | |
| 4506 } | |
| 4507 | |
| 4508 HeapRegion* G1CollectedHeap::pop_unclean_region_list_locked() { | |
| 4509 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4510 HeapRegion* res = _unclean_region_list.pop(); | |
| 4511 if (res != NULL) { | |
| 4512 // Inform ZF thread that there's a new unclean head. | |
| 4513 if (_unclean_region_list.hd() != NULL && should_zf()) | |
| 4514 ZF_mon->notify_all(); | |
| 4515 } | |
| 4516 return res; | |
| 4517 } | |
| 4518 | |
| 4519 HeapRegion* G1CollectedHeap::peek_unclean_region_list_locked() { | |
| 4520 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4521 return _unclean_region_list.hd(); | |
| 4522 } | |
| 4523 | |
| 4524 | |
| 4525 bool G1CollectedHeap::move_cleaned_region_to_free_list_locked() { | |
| 4526 assert(ZF_mon->owned_by_self(), "Precondition"); | |
| 4527 HeapRegion* r = peek_unclean_region_list_locked(); | |
| 4528 if (r != NULL && r->zero_fill_state() == HeapRegion::ZeroFilled) { | |
| 4529 // Result of below must be equal to "r", since we hold the lock. | |
| 4530 (void)pop_unclean_region_list_locked(); | |
| 4531 put_free_region_on_list_locked(r); | |
| 4532 return true; | |
| 4533 } else { | |
| 4534 return false; | |
| 4535 } | |
| 4536 } | |
| 4537 | |
| 4538 bool G1CollectedHeap::move_cleaned_region_to_free_list() { | |
| 4539 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4540 return move_cleaned_region_to_free_list_locked(); | |
| 4541 } | |
| 4542 | |
| 4543 | |
| 4544 void G1CollectedHeap::put_free_region_on_list_locked(HeapRegion* r) { | |
| 4545 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4546 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4547 assert(r->zero_fill_state() == HeapRegion::ZeroFilled, | |
| 4548 "Regions on free list must be zero filled"); | |
| 4549 assert(!r->isHumongous(), "Must not be humongous."); | |
| 4550 assert(r->is_empty(), "Better be empty"); | |
| 4551 assert(!r->is_on_free_list(), | |
| 4552 "Better not already be on free list"); | |
| 4553 assert(!r->is_on_unclean_list(), | |
| 4554 "Better not already be on unclean list"); | |
| 4555 r->set_on_free_list(true); | |
| 4556 r->set_next_on_free_list(_free_region_list); | |
| 4557 _free_region_list = r; | |
| 4558 _free_region_list_size++; | |
| 4559 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4560 } | |
| 4561 | |
| 4562 void G1CollectedHeap::put_free_region_on_list(HeapRegion* r) { | |
| 4563 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4564 put_free_region_on_list_locked(r); | |
| 4565 } | |
| 4566 | |
| 4567 HeapRegion* G1CollectedHeap::pop_free_region_list_locked() { | |
| 4568 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4569 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4570 HeapRegion* res = _free_region_list; | |
| 4571 if (res != NULL) { | |
| 4572 _free_region_list = res->next_from_free_list(); | |
| 4573 _free_region_list_size--; | |
| 4574 res->set_on_free_list(false); | |
| 4575 res->set_next_on_free_list(NULL); | |
| 4576 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4577 } | |
| 4578 return res; | |
| 4579 } | |
| 4580 | |
| 4581 | |
| 4582 HeapRegion* G1CollectedHeap::alloc_free_region_from_lists(bool zero_filled) { | |
| 4583 // By self, or on behalf of self. | |
| 4584 assert(Heap_lock->is_locked(), "Precondition"); | |
| 4585 HeapRegion* res = NULL; | |
| 4586 bool first = true; | |
| 4587 while (res == NULL) { | |
| 4588 if (zero_filled || !first) { | |
| 4589 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4590 res = pop_free_region_list_locked(); | |
| 4591 if (res != NULL) { | |
| 4592 assert(!res->zero_fill_is_allocated(), | |
| 4593 "No allocated regions on free list."); | |
| 4594 res->set_zero_fill_allocated(); | |
| 4595 } else if (!first) { | |
| 4596 break; // We tried both, time to return NULL. | |
| 4597 } | |
| 4598 } | |
| 4599 | |
| 4600 if (res == NULL) { | |
| 4601 res = alloc_region_from_unclean_list(zero_filled); | |
| 4602 } | |
| 4603 assert(res == NULL || | |
| 4604 !zero_filled || | |
| 4605 res->zero_fill_is_allocated(), | |
| 4606 "We must have allocated the region we're returning"); | |
| 4607 first = false; | |
| 4608 } | |
| 4609 return res; | |
| 4610 } | |
| 4611 | |
| 4612 void G1CollectedHeap::remove_allocated_regions_from_lists() { | |
| 4613 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4614 { | |
| 4615 HeapRegion* prev = NULL; | |
| 4616 HeapRegion* cur = _unclean_region_list.hd(); | |
| 4617 while (cur != NULL) { | |
| 4618 HeapRegion* next = cur->next_from_unclean_list(); | |
| 4619 if (cur->zero_fill_is_allocated()) { | |
| 4620 // Remove from the list. | |
| 4621 if (prev == NULL) { | |
| 4622 (void)_unclean_region_list.pop(); | |
| 4623 } else { | |
| 4624 _unclean_region_list.delete_after(prev); | |
| 4625 } | |
| 4626 cur->set_on_unclean_list(false); | |
| 4627 cur->set_next_on_unclean_list(NULL); | |
| 4628 } else { | |
| 4629 prev = cur; | |
| 4630 } | |
| 4631 cur = next; | |
| 4632 } | |
| 4633 assert(_unclean_region_list.sz() == unclean_region_list_length(), | |
| 4634 "Inv"); | |
| 4635 } | |
| 4636 | |
| 4637 { | |
| 4638 HeapRegion* prev = NULL; | |
| 4639 HeapRegion* cur = _free_region_list; | |
| 4640 while (cur != NULL) { | |
| 4641 HeapRegion* next = cur->next_from_free_list(); | |
| 4642 if (cur->zero_fill_is_allocated()) { | |
| 4643 // Remove from the list. | |
| 4644 if (prev == NULL) { | |
| 4645 _free_region_list = cur->next_from_free_list(); | |
| 4646 } else { | |
| 4647 prev->set_next_on_free_list(cur->next_from_free_list()); | |
| 4648 } | |
| 4649 cur->set_on_free_list(false); | |
| 4650 cur->set_next_on_free_list(NULL); | |
| 4651 _free_region_list_size--; | |
| 4652 } else { | |
| 4653 prev = cur; | |
| 4654 } | |
| 4655 cur = next; | |
| 4656 } | |
| 4657 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4658 } | |
| 4659 } | |
| 4660 | |
| 4661 bool G1CollectedHeap::verify_region_lists() { | |
| 4662 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4663 return verify_region_lists_locked(); | |
| 4664 } | |
| 4665 | |
| 4666 bool G1CollectedHeap::verify_region_lists_locked() { | |
| 4667 HeapRegion* unclean = _unclean_region_list.hd(); | |
| 4668 while (unclean != NULL) { | |
| 4669 guarantee(unclean->is_on_unclean_list(), "Well, it is!"); | |
| 4670 guarantee(!unclean->is_on_free_list(), "Well, it shouldn't be!"); | |
| 4671 guarantee(unclean->zero_fill_state() != HeapRegion::Allocated, | |
| 4672 "Everything else is possible."); | |
| 4673 unclean = unclean->next_from_unclean_list(); | |
| 4674 } | |
| 4675 guarantee(_unclean_region_list.sz() == unclean_region_list_length(), "Inv"); | |
| 4676 | |
| 4677 HeapRegion* free_r = _free_region_list; | |
| 4678 while (free_r != NULL) { | |
| 4679 assert(free_r->is_on_free_list(), "Well, it is!"); | |
| 4680 assert(!free_r->is_on_unclean_list(), "Well, it shouldn't be!"); | |
| 4681 switch (free_r->zero_fill_state()) { | |
| 4682 case HeapRegion::NotZeroFilled: | |
| 4683 case HeapRegion::ZeroFilling: | |
| 4684 guarantee(false, "Should not be on free list."); | |
| 4685 break; | |
| 4686 default: | |
| 4687 // Everything else is possible. | |
| 4688 break; | |
| 4689 } | |
| 4690 free_r = free_r->next_from_free_list(); | |
| 4691 } | |
| 4692 guarantee(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4693 // If we didn't do an assertion... | |
| 4694 return true; | |
| 4695 } | |
| 4696 | |
| 4697 size_t G1CollectedHeap::free_region_list_length() { | |
| 4698 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4699 size_t len = 0; | |
| 4700 HeapRegion* cur = _free_region_list; | |
| 4701 while (cur != NULL) { | |
| 4702 len++; | |
| 4703 cur = cur->next_from_free_list(); | |
| 4704 } | |
| 4705 return len; | |
| 4706 } | |
| 4707 | |
| 4708 size_t G1CollectedHeap::unclean_region_list_length() { | |
| 4709 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4710 return _unclean_region_list.length(); | |
| 4711 } | |
| 4712 | |
| 4713 size_t G1CollectedHeap::n_regions() { | |
| 4714 return _hrs->length(); | |
| 4715 } | |
| 4716 | |
| 4717 size_t G1CollectedHeap::max_regions() { | |
| 4718 return | |
| 4719 (size_t)align_size_up(g1_reserved_obj_bytes(), HeapRegion::GrainBytes) / | |
| 4720 HeapRegion::GrainBytes; | |
| 4721 } | |
| 4722 | |
| 4723 size_t G1CollectedHeap::free_regions() { | |
| 4724 /* Possibly-expensive assert. | |
| 4725 assert(_free_regions == count_free_regions(), | |
| 4726 "_free_regions is off."); | |
| 4727 */ | |
| 4728 return _free_regions; | |
| 4729 } | |
| 4730 | |
| 4731 bool G1CollectedHeap::should_zf() { | |
| 4732 return _free_region_list_size < (size_t) G1ConcZFMaxRegions; | |
| 4733 } | |
| 4734 | |
| 4735 class RegionCounter: public HeapRegionClosure { | |
| 4736 size_t _n; | |
| 4737 public: | |
| 4738 RegionCounter() : _n(0) {} | |
| 4739 bool doHeapRegion(HeapRegion* r) { | |
| 677 | 4740 if (r->is_empty()) { |
| 342 | 4741 assert(!r->isHumongous(), "H regions should not be empty."); |
| 4742 _n++; | |
| 4743 } | |
| 4744 return false; | |
| 4745 } | |
| 4746 int res() { return (int) _n; } | |
| 4747 }; | |
| 4748 | |
| 4749 size_t G1CollectedHeap::count_free_regions() { | |
| 4750 RegionCounter rc; | |
| 4751 heap_region_iterate(&rc); | |
| 4752 size_t n = rc.res(); | |
| 4753 if (_cur_alloc_region != NULL && _cur_alloc_region->is_empty()) | |
| 4754 n--; | |
| 4755 return n; | |
| 4756 } | |
| 4757 | |
| 4758 size_t G1CollectedHeap::count_free_regions_list() { | |
| 4759 size_t n = 0; | |
| 4760 size_t o = 0; | |
| 4761 ZF_mon->lock_without_safepoint_check(); | |
| 4762 HeapRegion* cur = _free_region_list; | |
| 4763 while (cur != NULL) { | |
| 4764 cur = cur->next_from_free_list(); | |
| 4765 n++; | |
| 4766 } | |
| 4767 size_t m = unclean_region_list_length(); | |
| 4768 ZF_mon->unlock(); | |
| 4769 return n + m; | |
| 4770 } | |
| 4771 | |
| 4772 bool G1CollectedHeap::should_set_young_locked() { | |
| 4773 assert(heap_lock_held_for_gc(), | |
| 4774 "the heap lock should already be held by or for this thread"); | |
| 4775 return (g1_policy()->in_young_gc_mode() && | |
| 4776 g1_policy()->should_add_next_region_to_young_list()); | |
| 4777 } | |
| 4778 | |
| 4779 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
| 4780 assert(heap_lock_held_for_gc(), | |
| 4781 "the heap lock should already be held by or for this thread"); | |
| 4782 _young_list->push_region(hr); | |
| 4783 g1_policy()->set_region_short_lived(hr); | |
| 4784 } | |
| 4785 | |
| 4786 class NoYoungRegionsClosure: public HeapRegionClosure { | |
| 4787 private: | |
| 4788 bool _success; | |
| 4789 public: | |
| 4790 NoYoungRegionsClosure() : _success(true) { } | |
| 4791 bool doHeapRegion(HeapRegion* r) { | |
| 4792 if (r->is_young()) { | |
| 4793 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
| 4794 r->bottom(), r->end()); | |
| 4795 _success = false; | |
| 4796 } | |
| 4797 return false; | |
| 4798 } | |
| 4799 bool success() { return _success; } | |
| 4800 }; | |
| 4801 | |
| 4802 bool G1CollectedHeap::check_young_list_empty(bool ignore_scan_only_list, | |
| 4803 bool check_sample) { | |
| 4804 bool ret = true; | |
| 4805 | |
| 4806 ret = _young_list->check_list_empty(ignore_scan_only_list, check_sample); | |
| 4807 if (!ignore_scan_only_list) { | |
| 4808 NoYoungRegionsClosure closure; | |
| 4809 heap_region_iterate(&closure); | |
| 4810 ret = ret && closure.success(); | |
| 4811 } | |
| 4812 | |
| 4813 return ret; | |
| 4814 } | |
| 4815 | |
| 4816 void G1CollectedHeap::empty_young_list() { | |
| 4817 assert(heap_lock_held_for_gc(), | |
| 4818 "the heap lock should already be held by or for this thread"); | |
| 4819 assert(g1_policy()->in_young_gc_mode(), "should be in young GC mode"); | |
| 4820 | |
| 4821 _young_list->empty_list(); | |
| 4822 } | |
| 4823 | |
| 4824 bool G1CollectedHeap::all_alloc_regions_no_allocs_since_save_marks() { | |
| 4825 bool no_allocs = true; | |
| 4826 for (int ap = 0; ap < GCAllocPurposeCount && no_allocs; ++ap) { | |
| 4827 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 4828 no_allocs = r == NULL || r->saved_mark_at_top(); | |
| 4829 } | |
| 4830 return no_allocs; | |
| 4831 } | |
| 4832 | |
| 545 | 4833 void G1CollectedHeap::retire_all_alloc_regions() { |
| 342 | 4834 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
| 4835 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 4836 if (r != NULL) { | |
| 4837 // Check for aliases. | |
| 4838 bool has_processed_alias = false; | |
| 4839 for (int i = 0; i < ap; ++i) { | |
| 4840 if (_gc_alloc_regions[i] == r) { | |
| 4841 has_processed_alias = true; | |
| 4842 break; | |
| 4843 } | |
| 4844 } | |
| 4845 if (!has_processed_alias) { | |
| 545 | 4846 retire_alloc_region(r, false /* par */); |
| 342 | 4847 } |
| 4848 } | |
| 4849 } | |
| 4850 } | |
| 4851 | |
| 4852 | |
| 4853 // Done at the start of full GC. | |
| 4854 void G1CollectedHeap::tear_down_region_lists() { | |
| 4855 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4856 while (pop_unclean_region_list_locked() != NULL) ; | |
| 4857 assert(_unclean_region_list.hd() == NULL && _unclean_region_list.sz() == 0, | |
| 4858 "Postconditions of loop.") | |
| 4859 while (pop_free_region_list_locked() != NULL) ; | |
| 4860 assert(_free_region_list == NULL, "Postcondition of loop."); | |
| 4861 if (_free_region_list_size != 0) { | |
| 4862 gclog_or_tty->print_cr("Size is %d.", _free_region_list_size); | |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
4863 print_on(gclog_or_tty, true /* extended */); |
| 342 | 4864 } |
| 4865 assert(_free_region_list_size == 0, "Postconditions of loop."); | |
| 4866 } | |
| 4867 | |
| 4868 | |
| 4869 class RegionResetter: public HeapRegionClosure { | |
| 4870 G1CollectedHeap* _g1; | |
| 4871 int _n; | |
| 4872 public: | |
| 4873 RegionResetter() : _g1(G1CollectedHeap::heap()), _n(0) {} | |
| 4874 bool doHeapRegion(HeapRegion* r) { | |
| 4875 if (r->continuesHumongous()) return false; | |
| 4876 if (r->top() > r->bottom()) { | |
| 4877 if (r->top() < r->end()) { | |
| 4878 Copy::fill_to_words(r->top(), | |
| 4879 pointer_delta(r->end(), r->top())); | |
| 4880 } | |
| 4881 r->set_zero_fill_allocated(); | |
| 4882 } else { | |
| 4883 assert(r->is_empty(), "tautology"); | |
| 677 | 4884 _n++; |
| 4885 switch (r->zero_fill_state()) { | |
| 342 | 4886 case HeapRegion::NotZeroFilled: |
| 4887 case HeapRegion::ZeroFilling: | |
| 4888 _g1->put_region_on_unclean_list_locked(r); | |
| 4889 break; | |
| 4890 case HeapRegion::Allocated: | |
| 4891 r->set_zero_fill_complete(); | |
| 4892 // no break; go on to put on free list. | |
| 4893 case HeapRegion::ZeroFilled: | |
| 4894 _g1->put_free_region_on_list_locked(r); | |
| 4895 break; | |
| 4896 } | |
| 4897 } | |
| 4898 return false; | |
| 4899 } | |
| 4900 | |
| 4901 int getFreeRegionCount() {return _n;} | |
| 4902 }; | |
| 4903 | |
| 4904 // Done at the end of full GC. | |
| 4905 void G1CollectedHeap::rebuild_region_lists() { | |
| 4906 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4907 // This needs to go at the end of the full GC. | |
| 4908 RegionResetter rs; | |
| 4909 heap_region_iterate(&rs); | |
| 4910 _free_regions = rs.getFreeRegionCount(); | |
| 4911 // Tell the ZF thread it may have work to do. | |
| 4912 if (should_zf()) ZF_mon->notify_all(); | |
| 4913 } | |
| 4914 | |
| 4915 class UsedRegionsNeedZeroFillSetter: public HeapRegionClosure { | |
| 4916 G1CollectedHeap* _g1; | |
| 4917 int _n; | |
| 4918 public: | |
| 4919 UsedRegionsNeedZeroFillSetter() : _g1(G1CollectedHeap::heap()), _n(0) {} | |
| 4920 bool doHeapRegion(HeapRegion* r) { | |
| 4921 if (r->continuesHumongous()) return false; | |
| 4922 if (r->top() > r->bottom()) { | |
| 4923 // There are assertions in "set_zero_fill_needed()" below that | |
| 4924 // require top() == bottom(), so this is technically illegal. | |
| 4925 // We'll skirt the law here, by making that true temporarily. | |
| 4926 DEBUG_ONLY(HeapWord* save_top = r->top(); | |
| 4927 r->set_top(r->bottom())); | |
| 4928 r->set_zero_fill_needed(); | |
| 4929 DEBUG_ONLY(r->set_top(save_top)); | |
| 4930 } | |
| 4931 return false; | |
| 4932 } | |
| 4933 }; | |
| 4934 | |
| 4935 // Done at the start of full GC. | |
| 4936 void G1CollectedHeap::set_used_regions_to_need_zero_fill() { | |
| 4937 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4938 // This needs to go at the end of the full GC. | |
| 4939 UsedRegionsNeedZeroFillSetter rs; | |
| 4940 heap_region_iterate(&rs); | |
| 4941 } | |
| 4942 | |
| 4943 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
| 4944 _refine_cte_cl->set_concurrent(concurrent); | |
| 4945 } | |
| 4946 | |
| 4947 #ifndef PRODUCT | |
| 4948 | |
| 4949 class PrintHeapRegionClosure: public HeapRegionClosure { | |
| 4950 public: | |
| 4951 bool doHeapRegion(HeapRegion *r) { | |
| 4952 gclog_or_tty->print("Region: "PTR_FORMAT":", r); | |
| 4953 if (r != NULL) { | |
| 4954 if (r->is_on_free_list()) | |
| 4955 gclog_or_tty->print("Free "); | |
| 4956 if (r->is_young()) | |
| 4957 gclog_or_tty->print("Young "); | |
| 4958 if (r->isHumongous()) | |
| 4959 gclog_or_tty->print("Is Humongous "); | |
| 4960 r->print(); | |
| 4961 } | |
| 4962 return false; | |
| 4963 } | |
| 4964 }; | |
| 4965 | |
| 4966 class SortHeapRegionClosure : public HeapRegionClosure { | |
| 4967 size_t young_regions,free_regions, unclean_regions; | |
| 4968 size_t hum_regions, count; | |
| 4969 size_t unaccounted, cur_unclean, cur_alloc; | |
| 4970 size_t total_free; | |
| 4971 HeapRegion* cur; | |
| 4972 public: | |
| 4973 SortHeapRegionClosure(HeapRegion *_cur) : cur(_cur), young_regions(0), | |
| 4974 free_regions(0), unclean_regions(0), | |
| 4975 hum_regions(0), | |
| 4976 count(0), unaccounted(0), | |
| 4977 cur_alloc(0), total_free(0) | |
| 4978 {} | |
| 4979 bool doHeapRegion(HeapRegion *r) { | |
| 4980 count++; | |
| 4981 if (r->is_on_free_list()) free_regions++; | |
| 4982 else if (r->is_on_unclean_list()) unclean_regions++; | |
| 4983 else if (r->isHumongous()) hum_regions++; | |
| 4984 else if (r->is_young()) young_regions++; | |
| 4985 else if (r == cur) cur_alloc++; | |
| 4986 else unaccounted++; | |
| 4987 return false; | |
| 4988 } | |
| 4989 void print() { | |
| 4990 total_free = free_regions + unclean_regions; | |
| 4991 gclog_or_tty->print("%d regions\n", count); | |
| 4992 gclog_or_tty->print("%d free: free_list = %d unclean = %d\n", | |
| 4993 total_free, free_regions, unclean_regions); | |
| 4994 gclog_or_tty->print("%d humongous %d young\n", | |
| 4995 hum_regions, young_regions); | |
| 4996 gclog_or_tty->print("%d cur_alloc\n", cur_alloc); | |
| 4997 gclog_or_tty->print("UHOH unaccounted = %d\n", unaccounted); | |
| 4998 } | |
| 4999 }; | |
| 5000 | |
| 5001 void G1CollectedHeap::print_region_counts() { | |
| 5002 SortHeapRegionClosure sc(_cur_alloc_region); | |
| 5003 PrintHeapRegionClosure cl; | |
| 5004 heap_region_iterate(&cl); | |
| 5005 heap_region_iterate(&sc); | |
| 5006 sc.print(); | |
| 5007 print_region_accounting_info(); | |
| 5008 }; | |
| 5009 | |
| 5010 bool G1CollectedHeap::regions_accounted_for() { | |
| 5011 // TODO: regions accounting for young/survivor/tenured | |
| 5012 return true; | |
| 5013 } | |
| 5014 | |
| 5015 bool G1CollectedHeap::print_region_accounting_info() { | |
| 5016 gclog_or_tty->print_cr("Free regions: %d (count: %d count list %d) (clean: %d unclean: %d).", | |
| 5017 free_regions(), | |
| 5018 count_free_regions(), count_free_regions_list(), | |
| 5019 _free_region_list_size, _unclean_region_list.sz()); | |
| 5020 gclog_or_tty->print_cr("cur_alloc: %d.", | |
| 5021 (_cur_alloc_region == NULL ? 0 : 1)); | |
| 5022 gclog_or_tty->print_cr("H regions: %d.", _num_humongous_regions); | |
| 5023 | |
| 5024 // TODO: check regions accounting for young/survivor/tenured | |
| 5025 return true; | |
| 5026 } | |
| 5027 | |
| 5028 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
| 5029 HeapRegion* hr = heap_region_containing(p); | |
| 5030 if (hr == NULL) { | |
| 5031 return is_in_permanent(p); | |
| 5032 } else { | |
| 5033 return hr->is_in(p); | |
| 5034 } | |
| 5035 } | |
| 5036 #endif // PRODUCT | |
| 5037 | |
| 5038 void G1CollectedHeap::g1_unimplemented() { | |
| 5039 // Unimplemented(); | |
| 5040 } |