Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 1391:79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
Summary: Replaces the G1-specific parameter with the existing ones that are used by the other GCs (YoungPLABSize and OldPLABSize)
Reviewed-by: tonyp, johnc
| author | apetrusenko |
|---|---|
| date | Fri, 16 Apr 2010 08:48:16 -0700 |
| parents | f9ec1e4bbb44 |
| children | 1316cec51b4d |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright 2001-2010 Sun Microsystems, Inc. All Rights Reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #include "incls/_precompiled.incl" | |
| 26 #include "incls/_g1CollectedHeap.cpp.incl" | |
| 27 | |
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28 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0; |
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29 |
| 342 | 30 // turn it on so that the contents of the young list (scan-only / |
| 31 // to-be-collected) are printed at "strategic" points before / during | |
| 32 // / after the collection --- this is useful for debugging | |
| 33 #define SCAN_ONLY_VERBOSE 0 | |
| 34 // CURRENT STATUS | |
| 35 // This file is under construction. Search for "FIXME". | |
| 36 | |
| 37 // INVARIANTS/NOTES | |
| 38 // | |
| 39 // All allocation activity covered by the G1CollectedHeap interface is | |
| 40 // serialized by acquiring the HeapLock. This happens in | |
| 41 // mem_allocate_work, which all such allocation functions call. | |
| 42 // (Note that this does not apply to TLAB allocation, which is not part | |
| 43 // of this interface: it is done by clients of this interface.) | |
| 44 | |
| 45 // Local to this file. | |
| 46 | |
| 47 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
| 48 SuspendibleThreadSet* _sts; | |
| 49 G1RemSet* _g1rs; | |
| 50 ConcurrentG1Refine* _cg1r; | |
| 51 bool _concurrent; | |
| 52 public: | |
| 53 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
| 54 G1RemSet* g1rs, | |
| 55 ConcurrentG1Refine* cg1r) : | |
| 56 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
| 57 {} | |
| 58 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 59 _g1rs->concurrentRefineOneCard(card_ptr, worker_i); | |
| 60 if (_concurrent && _sts->should_yield()) { | |
| 61 // Caller will actually yield. | |
| 62 return false; | |
| 63 } | |
| 64 // Otherwise, we finished successfully; return true. | |
| 65 return true; | |
| 66 } | |
| 67 void set_concurrent(bool b) { _concurrent = b; } | |
| 68 }; | |
| 69 | |
| 70 | |
| 71 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 72 int _calls; | |
| 73 G1CollectedHeap* _g1h; | |
| 74 CardTableModRefBS* _ctbs; | |
| 75 int _histo[256]; | |
| 76 public: | |
| 77 ClearLoggedCardTableEntryClosure() : | |
| 78 _calls(0) | |
| 79 { | |
| 80 _g1h = G1CollectedHeap::heap(); | |
| 81 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 82 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
| 83 } | |
| 84 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 85 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 86 _calls++; | |
| 87 unsigned char* ujb = (unsigned char*)card_ptr; | |
| 88 int ind = (int)(*ujb); | |
| 89 _histo[ind]++; | |
| 90 *card_ptr = -1; | |
| 91 } | |
| 92 return true; | |
| 93 } | |
| 94 int calls() { return _calls; } | |
| 95 void print_histo() { | |
| 96 gclog_or_tty->print_cr("Card table value histogram:"); | |
| 97 for (int i = 0; i < 256; i++) { | |
| 98 if (_histo[i] != 0) { | |
| 99 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
| 100 } | |
| 101 } | |
| 102 } | |
| 103 }; | |
| 104 | |
| 105 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 106 int _calls; | |
| 107 G1CollectedHeap* _g1h; | |
| 108 CardTableModRefBS* _ctbs; | |
| 109 public: | |
| 110 RedirtyLoggedCardTableEntryClosure() : | |
| 111 _calls(0) | |
| 112 { | |
| 113 _g1h = G1CollectedHeap::heap(); | |
| 114 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 115 } | |
| 116 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 117 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 118 _calls++; | |
| 119 *card_ptr = 0; | |
| 120 } | |
| 121 return true; | |
| 122 } | |
| 123 int calls() { return _calls; } | |
| 124 }; | |
| 125 | |
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126 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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127 public: |
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128 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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129 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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130 return true; |
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131 } |
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132 }; |
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133 |
| 342 | 134 YoungList::YoungList(G1CollectedHeap* g1h) |
| 135 : _g1h(g1h), _head(NULL), | |
| 136 _scan_only_head(NULL), _scan_only_tail(NULL), _curr_scan_only(NULL), | |
| 137 _length(0), _scan_only_length(0), | |
| 138 _last_sampled_rs_lengths(0), | |
| 545 | 139 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) |
| 342 | 140 { |
| 141 guarantee( check_list_empty(false), "just making sure..." ); | |
| 142 } | |
| 143 | |
| 144 void YoungList::push_region(HeapRegion *hr) { | |
| 145 assert(!hr->is_young(), "should not already be young"); | |
| 146 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
| 147 | |
| 148 hr->set_next_young_region(_head); | |
| 149 _head = hr; | |
| 150 | |
| 151 hr->set_young(); | |
| 152 double yg_surv_rate = _g1h->g1_policy()->predict_yg_surv_rate((int)_length); | |
| 153 ++_length; | |
| 154 } | |
| 155 | |
| 156 void YoungList::add_survivor_region(HeapRegion* hr) { | |
| 545 | 157 assert(hr->is_survivor(), "should be flagged as survivor region"); |
| 342 | 158 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
| 159 | |
| 160 hr->set_next_young_region(_survivor_head); | |
| 161 if (_survivor_head == NULL) { | |
| 545 | 162 _survivor_tail = hr; |
| 342 | 163 } |
| 164 _survivor_head = hr; | |
| 165 | |
| 166 ++_survivor_length; | |
| 167 } | |
| 168 | |
| 169 HeapRegion* YoungList::pop_region() { | |
| 170 while (_head != NULL) { | |
| 171 assert( length() > 0, "list should not be empty" ); | |
| 172 HeapRegion* ret = _head; | |
| 173 _head = ret->get_next_young_region(); | |
| 174 ret->set_next_young_region(NULL); | |
| 175 --_length; | |
| 176 assert(ret->is_young(), "region should be very young"); | |
| 177 | |
| 178 // Replace 'Survivor' region type with 'Young'. So the region will | |
| 179 // be treated as a young region and will not be 'confused' with | |
| 180 // newly created survivor regions. | |
| 181 if (ret->is_survivor()) { | |
| 182 ret->set_young(); | |
| 183 } | |
| 184 | |
| 185 if (!ret->is_scan_only()) { | |
| 186 return ret; | |
| 187 } | |
| 188 | |
| 189 // scan-only, we'll add it to the scan-only list | |
| 190 if (_scan_only_tail == NULL) { | |
| 191 guarantee( _scan_only_head == NULL, "invariant" ); | |
| 192 | |
| 193 _scan_only_head = ret; | |
| 194 _curr_scan_only = ret; | |
| 195 } else { | |
| 196 guarantee( _scan_only_head != NULL, "invariant" ); | |
| 197 _scan_only_tail->set_next_young_region(ret); | |
| 198 } | |
| 199 guarantee( ret->get_next_young_region() == NULL, "invariant" ); | |
| 200 _scan_only_tail = ret; | |
| 201 | |
| 202 // no need to be tagged as scan-only any more | |
| 203 ret->set_young(); | |
| 204 | |
| 205 ++_scan_only_length; | |
| 206 } | |
| 207 assert( length() == 0, "list should be empty" ); | |
| 208 return NULL; | |
| 209 } | |
| 210 | |
| 211 void YoungList::empty_list(HeapRegion* list) { | |
| 212 while (list != NULL) { | |
| 213 HeapRegion* next = list->get_next_young_region(); | |
| 214 list->set_next_young_region(NULL); | |
| 215 list->uninstall_surv_rate_group(); | |
| 216 list->set_not_young(); | |
| 217 list = next; | |
| 218 } | |
| 219 } | |
| 220 | |
| 221 void YoungList::empty_list() { | |
| 222 assert(check_list_well_formed(), "young list should be well formed"); | |
| 223 | |
| 224 empty_list(_head); | |
| 225 _head = NULL; | |
| 226 _length = 0; | |
| 227 | |
| 228 empty_list(_scan_only_head); | |
| 229 _scan_only_head = NULL; | |
| 230 _scan_only_tail = NULL; | |
| 231 _scan_only_length = 0; | |
| 232 _curr_scan_only = NULL; | |
| 233 | |
| 234 empty_list(_survivor_head); | |
| 235 _survivor_head = NULL; | |
| 545 | 236 _survivor_tail = NULL; |
| 342 | 237 _survivor_length = 0; |
| 238 | |
| 239 _last_sampled_rs_lengths = 0; | |
| 240 | |
| 241 assert(check_list_empty(false), "just making sure..."); | |
| 242 } | |
| 243 | |
| 244 bool YoungList::check_list_well_formed() { | |
| 245 bool ret = true; | |
| 246 | |
| 247 size_t length = 0; | |
| 248 HeapRegion* curr = _head; | |
| 249 HeapRegion* last = NULL; | |
| 250 while (curr != NULL) { | |
| 251 if (!curr->is_young() || curr->is_scan_only()) { | |
| 252 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " | |
| 253 "incorrectly tagged (%d, %d)", | |
| 254 curr->bottom(), curr->end(), | |
| 255 curr->is_young(), curr->is_scan_only()); | |
| 256 ret = false; | |
| 257 } | |
| 258 ++length; | |
| 259 last = curr; | |
| 260 curr = curr->get_next_young_region(); | |
| 261 } | |
| 262 ret = ret && (length == _length); | |
| 263 | |
| 264 if (!ret) { | |
| 265 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
| 266 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
| 267 length, _length); | |
| 268 } | |
| 269 | |
| 270 bool scan_only_ret = true; | |
| 271 length = 0; | |
| 272 curr = _scan_only_head; | |
| 273 last = NULL; | |
| 274 while (curr != NULL) { | |
| 275 if (!curr->is_young() || curr->is_scan_only()) { | |
| 276 gclog_or_tty->print_cr("### SCAN-ONLY REGION "PTR_FORMAT"-"PTR_FORMAT" " | |
| 277 "incorrectly tagged (%d, %d)", | |
| 278 curr->bottom(), curr->end(), | |
| 279 curr->is_young(), curr->is_scan_only()); | |
| 280 scan_only_ret = false; | |
| 281 } | |
| 282 ++length; | |
| 283 last = curr; | |
| 284 curr = curr->get_next_young_region(); | |
| 285 } | |
| 286 scan_only_ret = scan_only_ret && (length == _scan_only_length); | |
| 287 | |
| 288 if ( (last != _scan_only_tail) || | |
| 289 (_scan_only_head == NULL && _scan_only_tail != NULL) || | |
| 290 (_scan_only_head != NULL && _scan_only_tail == NULL) ) { | |
| 291 gclog_or_tty->print_cr("## _scan_only_tail is set incorrectly"); | |
| 292 scan_only_ret = false; | |
| 293 } | |
| 294 | |
| 295 if (_curr_scan_only != NULL && _curr_scan_only != _scan_only_head) { | |
| 296 gclog_or_tty->print_cr("### _curr_scan_only is set incorrectly"); | |
| 297 scan_only_ret = false; | |
| 298 } | |
| 299 | |
| 300 if (!scan_only_ret) { | |
| 301 gclog_or_tty->print_cr("### SCAN-ONLY LIST seems not well formed!"); | |
| 302 gclog_or_tty->print_cr("### list has %d entries, _scan_only_length is %d", | |
| 303 length, _scan_only_length); | |
| 304 } | |
| 305 | |
| 306 return ret && scan_only_ret; | |
| 307 } | |
| 308 | |
| 309 bool YoungList::check_list_empty(bool ignore_scan_only_list, | |
| 310 bool check_sample) { | |
| 311 bool ret = true; | |
| 312 | |
| 313 if (_length != 0) { | |
| 314 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
| 315 _length); | |
| 316 ret = false; | |
| 317 } | |
| 318 if (check_sample && _last_sampled_rs_lengths != 0) { | |
| 319 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
| 320 ret = false; | |
| 321 } | |
| 322 if (_head != NULL) { | |
| 323 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
| 324 ret = false; | |
| 325 } | |
| 326 if (!ret) { | |
| 327 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
| 328 } | |
| 329 | |
| 330 if (ignore_scan_only_list) | |
| 331 return ret; | |
| 332 | |
| 333 bool scan_only_ret = true; | |
| 334 if (_scan_only_length != 0) { | |
| 335 gclog_or_tty->print_cr("### SCAN-ONLY LIST should have 0 length, not %d", | |
| 336 _scan_only_length); | |
| 337 scan_only_ret = false; | |
| 338 } | |
| 339 if (_scan_only_head != NULL) { | |
| 340 gclog_or_tty->print_cr("### SCAN-ONLY LIST does not have a NULL head"); | |
| 341 scan_only_ret = false; | |
| 342 } | |
| 343 if (_scan_only_tail != NULL) { | |
| 344 gclog_or_tty->print_cr("### SCAN-ONLY LIST does not have a NULL tail"); | |
| 345 scan_only_ret = false; | |
| 346 } | |
| 347 if (!scan_only_ret) { | |
| 348 gclog_or_tty->print_cr("### SCAN-ONLY LIST does not seem empty"); | |
| 349 } | |
| 350 | |
| 351 return ret && scan_only_ret; | |
| 352 } | |
| 353 | |
| 354 void | |
| 355 YoungList::rs_length_sampling_init() { | |
| 356 _sampled_rs_lengths = 0; | |
| 357 _curr = _head; | |
| 358 } | |
| 359 | |
| 360 bool | |
| 361 YoungList::rs_length_sampling_more() { | |
| 362 return _curr != NULL; | |
| 363 } | |
| 364 | |
| 365 void | |
| 366 YoungList::rs_length_sampling_next() { | |
| 367 assert( _curr != NULL, "invariant" ); | |
| 368 _sampled_rs_lengths += _curr->rem_set()->occupied(); | |
| 369 _curr = _curr->get_next_young_region(); | |
| 370 if (_curr == NULL) { | |
| 371 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
| 372 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
| 373 } | |
| 374 } | |
| 375 | |
| 376 void | |
| 377 YoungList::reset_auxilary_lists() { | |
| 378 // We could have just "moved" the scan-only list to the young list. | |
| 379 // However, the scan-only list is ordered according to the region | |
| 380 // age in descending order, so, by moving one entry at a time, we | |
| 381 // ensure that it is recreated in ascending order. | |
| 382 | |
| 383 guarantee( is_empty(), "young list should be empty" ); | |
| 384 assert(check_list_well_formed(), "young list should be well formed"); | |
| 385 | |
| 386 // Add survivor regions to SurvRateGroup. | |
| 387 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
| 545 | 388 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
| 342 | 389 for (HeapRegion* curr = _survivor_head; |
| 390 curr != NULL; | |
| 391 curr = curr->get_next_young_region()) { | |
| 392 _g1h->g1_policy()->set_region_survivors(curr); | |
| 393 } | |
| 394 _g1h->g1_policy()->note_stop_adding_survivor_regions(); | |
| 395 | |
| 396 if (_survivor_head != NULL) { | |
| 397 _head = _survivor_head; | |
| 398 _length = _survivor_length + _scan_only_length; | |
| 545 | 399 _survivor_tail->set_next_young_region(_scan_only_head); |
| 342 | 400 } else { |
| 401 _head = _scan_only_head; | |
| 402 _length = _scan_only_length; | |
| 403 } | |
| 404 | |
| 405 for (HeapRegion* curr = _scan_only_head; | |
| 406 curr != NULL; | |
| 407 curr = curr->get_next_young_region()) { | |
| 408 curr->recalculate_age_in_surv_rate_group(); | |
| 409 } | |
| 410 _scan_only_head = NULL; | |
| 411 _scan_only_tail = NULL; | |
| 412 _scan_only_length = 0; | |
| 413 _curr_scan_only = NULL; | |
| 414 | |
| 415 _survivor_head = NULL; | |
| 545 | 416 _survivor_tail = NULL; |
| 342 | 417 _survivor_length = 0; |
| 545 | 418 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
| 342 | 419 |
| 420 assert(check_list_well_formed(), "young list should be well formed"); | |
| 421 } | |
| 422 | |
| 423 void YoungList::print() { | |
| 424 HeapRegion* lists[] = {_head, _scan_only_head, _survivor_head}; | |
| 425 const char* names[] = {"YOUNG", "SCAN-ONLY", "SURVIVOR"}; | |
| 426 | |
| 427 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
| 428 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
| 429 HeapRegion *curr = lists[list]; | |
| 430 if (curr == NULL) | |
| 431 gclog_or_tty->print_cr(" empty"); | |
| 432 while (curr != NULL) { | |
| 433 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
| 434 "age: %4d, y: %d, s-o: %d, surv: %d", | |
| 435 curr->bottom(), curr->end(), | |
| 436 curr->top(), | |
| 437 curr->prev_top_at_mark_start(), | |
| 438 curr->next_top_at_mark_start(), | |
| 439 curr->top_at_conc_mark_count(), | |
| 440 curr->age_in_surv_rate_group_cond(), | |
| 441 curr->is_young(), | |
| 442 curr->is_scan_only(), | |
| 443 curr->is_survivor()); | |
| 444 curr = curr->get_next_young_region(); | |
| 445 } | |
| 446 } | |
| 447 | |
| 448 gclog_or_tty->print_cr(""); | |
| 449 } | |
| 450 | |
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451 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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452 { |
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453 // Claim the right to put the region on the dirty cards region list |
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454 // by installing a self pointer. |
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455 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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456 if (next == NULL) { |
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457 HeapRegion* res = (HeapRegion*) |
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458 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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459 NULL); |
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460 if (res == NULL) { |
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461 HeapRegion* head; |
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462 do { |
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463 // Put the region to the dirty cards region list. |
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464 head = _dirty_cards_region_list; |
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465 next = (HeapRegion*) |
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466 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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467 if (next == head) { |
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468 assert(hr->get_next_dirty_cards_region() == hr, |
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469 "hr->get_next_dirty_cards_region() != hr"); |
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470 if (next == NULL) { |
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471 // The last region in the list points to itself. |
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472 hr->set_next_dirty_cards_region(hr); |
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473 } else { |
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474 hr->set_next_dirty_cards_region(next); |
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475 } |
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476 } |
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477 } while (next != head); |
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478 } |
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479 } |
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480 } |
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481 |
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482 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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483 { |
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484 HeapRegion* head; |
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485 HeapRegion* hr; |
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486 do { |
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487 head = _dirty_cards_region_list; |
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488 if (head == NULL) { |
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489 return NULL; |
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490 } |
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491 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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492 if (head == new_head) { |
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493 // The last region. |
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494 new_head = NULL; |
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495 } |
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496 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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497 head); |
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498 } while (hr != head); |
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499 assert(hr != NULL, "invariant"); |
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500 hr->set_next_dirty_cards_region(NULL); |
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501 return hr; |
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502 } |
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503 |
| 342 | 504 void G1CollectedHeap::stop_conc_gc_threads() { |
| 794 | 505 _cg1r->stop(); |
| 342 | 506 _czft->stop(); |
| 507 _cmThread->stop(); | |
| 508 } | |
| 509 | |
| 510 | |
| 511 void G1CollectedHeap::check_ct_logs_at_safepoint() { | |
| 512 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 513 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
| 514 | |
| 515 // Count the dirty cards at the start. | |
| 516 CountNonCleanMemRegionClosure count1(this); | |
| 517 ct_bs->mod_card_iterate(&count1); | |
| 518 int orig_count = count1.n(); | |
| 519 | |
| 520 // First clear the logged cards. | |
| 521 ClearLoggedCardTableEntryClosure clear; | |
| 522 dcqs.set_closure(&clear); | |
| 523 dcqs.apply_closure_to_all_completed_buffers(); | |
| 524 dcqs.iterate_closure_all_threads(false); | |
| 525 clear.print_histo(); | |
| 526 | |
| 527 // Now ensure that there's no dirty cards. | |
| 528 CountNonCleanMemRegionClosure count2(this); | |
| 529 ct_bs->mod_card_iterate(&count2); | |
| 530 if (count2.n() != 0) { | |
| 531 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
| 532 count2.n(), orig_count); | |
| 533 } | |
| 534 guarantee(count2.n() == 0, "Card table should be clean."); | |
| 535 | |
| 536 RedirtyLoggedCardTableEntryClosure redirty; | |
| 537 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
| 538 dcqs.apply_closure_to_all_completed_buffers(); | |
| 539 dcqs.iterate_closure_all_threads(false); | |
| 540 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
| 541 clear.calls(), orig_count); | |
| 542 guarantee(redirty.calls() == clear.calls(), | |
| 543 "Or else mechanism is broken."); | |
| 544 | |
| 545 CountNonCleanMemRegionClosure count3(this); | |
| 546 ct_bs->mod_card_iterate(&count3); | |
| 547 if (count3.n() != orig_count) { | |
| 548 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
| 549 orig_count, count3.n()); | |
| 550 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
| 551 } | |
| 552 | |
| 553 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 554 } | |
| 555 | |
| 556 // Private class members. | |
| 557 | |
| 558 G1CollectedHeap* G1CollectedHeap::_g1h; | |
| 559 | |
| 560 // Private methods. | |
| 561 | |
| 562 // Finds a HeapRegion that can be used to allocate a given size of block. | |
| 563 | |
| 564 | |
| 565 HeapRegion* G1CollectedHeap::newAllocRegion_work(size_t word_size, | |
| 566 bool do_expand, | |
| 567 bool zero_filled) { | |
| 568 ConcurrentZFThread::note_region_alloc(); | |
| 569 HeapRegion* res = alloc_free_region_from_lists(zero_filled); | |
| 570 if (res == NULL && do_expand) { | |
| 571 expand(word_size * HeapWordSize); | |
| 572 res = alloc_free_region_from_lists(zero_filled); | |
| 573 assert(res == NULL || | |
| 574 (!res->isHumongous() && | |
| 575 (!zero_filled || | |
| 576 res->zero_fill_state() == HeapRegion::Allocated)), | |
| 577 "Alloc Regions must be zero filled (and non-H)"); | |
| 578 } | |
| 579 if (res != NULL && res->is_empty()) _free_regions--; | |
| 580 assert(res == NULL || | |
| 581 (!res->isHumongous() && | |
| 582 (!zero_filled || | |
| 583 res->zero_fill_state() == HeapRegion::Allocated)), | |
| 584 "Non-young alloc Regions must be zero filled (and non-H)"); | |
| 585 | |
| 1282 | 586 if (G1PrintHeapRegions) { |
| 342 | 587 if (res != NULL) { |
| 588 gclog_or_tty->print_cr("new alloc region %d:["PTR_FORMAT", "PTR_FORMAT"], " | |
| 589 "top "PTR_FORMAT, | |
| 590 res->hrs_index(), res->bottom(), res->end(), res->top()); | |
| 591 } | |
| 592 } | |
| 593 | |
| 594 return res; | |
| 595 } | |
| 596 | |
| 597 HeapRegion* G1CollectedHeap::newAllocRegionWithExpansion(int purpose, | |
| 598 size_t word_size, | |
| 599 bool zero_filled) { | |
| 600 HeapRegion* alloc_region = NULL; | |
| 601 if (_gc_alloc_region_counts[purpose] < g1_policy()->max_regions(purpose)) { | |
| 602 alloc_region = newAllocRegion_work(word_size, true, zero_filled); | |
| 603 if (purpose == GCAllocForSurvived && alloc_region != NULL) { | |
| 545 | 604 alloc_region->set_survivor(); |
| 342 | 605 } |
| 606 ++_gc_alloc_region_counts[purpose]; | |
| 607 } else { | |
| 608 g1_policy()->note_alloc_region_limit_reached(purpose); | |
| 609 } | |
| 610 return alloc_region; | |
| 611 } | |
| 612 | |
| 613 // If could fit into free regions w/o expansion, try. | |
| 614 // Otherwise, if can expand, do so. | |
| 615 // Otherwise, if using ex regions might help, try with ex given back. | |
| 616 HeapWord* G1CollectedHeap::humongousObjAllocate(size_t word_size) { | |
| 617 assert(regions_accounted_for(), "Region leakage!"); | |
| 618 | |
| 619 // We can't allocate H regions while cleanupComplete is running, since | |
| 620 // some of the regions we find to be empty might not yet be added to the | |
| 621 // unclean list. (If we're already at a safepoint, this call is | |
| 622 // unnecessary, not to mention wrong.) | |
| 623 if (!SafepointSynchronize::is_at_safepoint()) | |
| 624 wait_for_cleanup_complete(); | |
| 625 | |
| 626 size_t num_regions = | |
| 627 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; | |
| 628 | |
| 629 // Special case if < one region??? | |
| 630 | |
| 631 // Remember the ft size. | |
| 632 size_t x_size = expansion_regions(); | |
| 633 | |
| 634 HeapWord* res = NULL; | |
| 635 bool eliminated_allocated_from_lists = false; | |
| 636 | |
| 637 // Can the allocation potentially fit in the free regions? | |
| 638 if (free_regions() >= num_regions) { | |
| 639 res = _hrs->obj_allocate(word_size); | |
| 640 } | |
| 641 if (res == NULL) { | |
| 642 // Try expansion. | |
| 643 size_t fs = _hrs->free_suffix(); | |
| 644 if (fs + x_size >= num_regions) { | |
| 645 expand((num_regions - fs) * HeapRegion::GrainBytes); | |
| 646 res = _hrs->obj_allocate(word_size); | |
| 647 assert(res != NULL, "This should have worked."); | |
| 648 } else { | |
| 649 // Expansion won't help. Are there enough free regions if we get rid | |
| 650 // of reservations? | |
| 651 size_t avail = free_regions(); | |
| 652 if (avail >= num_regions) { | |
| 653 res = _hrs->obj_allocate(word_size); | |
| 654 if (res != NULL) { | |
| 655 remove_allocated_regions_from_lists(); | |
| 656 eliminated_allocated_from_lists = true; | |
| 657 } | |
| 658 } | |
| 659 } | |
| 660 } | |
| 661 if (res != NULL) { | |
| 662 // Increment by the number of regions allocated. | |
| 663 // FIXME: Assumes regions all of size GrainBytes. | |
| 664 #ifndef PRODUCT | |
| 665 mr_bs()->verify_clean_region(MemRegion(res, res + num_regions * | |
| 666 HeapRegion::GrainWords)); | |
| 667 #endif | |
| 668 if (!eliminated_allocated_from_lists) | |
| 669 remove_allocated_regions_from_lists(); | |
| 670 _summary_bytes_used += word_size * HeapWordSize; | |
| 671 _free_regions -= num_regions; | |
| 672 _num_humongous_regions += (int) num_regions; | |
| 673 } | |
| 674 assert(regions_accounted_for(), "Region Leakage"); | |
| 675 return res; | |
| 676 } | |
| 677 | |
| 678 HeapWord* | |
| 679 G1CollectedHeap::attempt_allocation_slow(size_t word_size, | |
| 680 bool permit_collection_pause) { | |
| 681 HeapWord* res = NULL; | |
| 682 HeapRegion* allocated_young_region = NULL; | |
| 683 | |
| 684 assert( SafepointSynchronize::is_at_safepoint() || | |
| 685 Heap_lock->owned_by_self(), "pre condition of the call" ); | |
| 686 | |
| 687 if (isHumongous(word_size)) { | |
| 688 // Allocation of a humongous object can, in a sense, complete a | |
| 689 // partial region, if the previous alloc was also humongous, and | |
| 690 // caused the test below to succeed. | |
| 691 if (permit_collection_pause) | |
| 692 do_collection_pause_if_appropriate(word_size); | |
| 693 res = humongousObjAllocate(word_size); | |
| 694 assert(_cur_alloc_region == NULL | |
| 695 || !_cur_alloc_region->isHumongous(), | |
| 696 "Prevent a regression of this bug."); | |
| 697 | |
| 698 } else { | |
|
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699 // We may have concurrent cleanup working at the time. Wait for it |
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700 // to complete. In the future we would probably want to make the |
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701 // concurrent cleanup truly concurrent by decoupling it from the |
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702 // allocation. |
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703 if (!SafepointSynchronize::is_at_safepoint()) |
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704 wait_for_cleanup_complete(); |
| 342 | 705 // If we do a collection pause, this will be reset to a non-NULL |
| 706 // value. If we don't, nulling here ensures that we allocate a new | |
| 707 // region below. | |
| 708 if (_cur_alloc_region != NULL) { | |
| 709 // We're finished with the _cur_alloc_region. | |
| 710 _summary_bytes_used += _cur_alloc_region->used(); | |
| 711 _cur_alloc_region = NULL; | |
| 712 } | |
| 713 assert(_cur_alloc_region == NULL, "Invariant."); | |
| 714 // Completion of a heap region is perhaps a good point at which to do | |
| 715 // a collection pause. | |
| 716 if (permit_collection_pause) | |
| 717 do_collection_pause_if_appropriate(word_size); | |
| 718 // Make sure we have an allocation region available. | |
| 719 if (_cur_alloc_region == NULL) { | |
| 720 if (!SafepointSynchronize::is_at_safepoint()) | |
| 721 wait_for_cleanup_complete(); | |
| 722 bool next_is_young = should_set_young_locked(); | |
| 723 // If the next region is not young, make sure it's zero-filled. | |
| 724 _cur_alloc_region = newAllocRegion(word_size, !next_is_young); | |
| 725 if (_cur_alloc_region != NULL) { | |
| 726 _summary_bytes_used -= _cur_alloc_region->used(); | |
| 727 if (next_is_young) { | |
| 728 set_region_short_lived_locked(_cur_alloc_region); | |
| 729 allocated_young_region = _cur_alloc_region; | |
| 730 } | |
| 731 } | |
| 732 } | |
| 733 assert(_cur_alloc_region == NULL || !_cur_alloc_region->isHumongous(), | |
| 734 "Prevent a regression of this bug."); | |
| 735 | |
| 736 // Now retry the allocation. | |
| 737 if (_cur_alloc_region != NULL) { | |
| 738 res = _cur_alloc_region->allocate(word_size); | |
| 739 } | |
| 740 } | |
| 741 | |
| 742 // NOTE: fails frequently in PRT | |
| 743 assert(regions_accounted_for(), "Region leakage!"); | |
| 744 | |
| 745 if (res != NULL) { | |
| 746 if (!SafepointSynchronize::is_at_safepoint()) { | |
| 747 assert( permit_collection_pause, "invariant" ); | |
| 748 assert( Heap_lock->owned_by_self(), "invariant" ); | |
| 749 Heap_lock->unlock(); | |
| 750 } | |
| 751 | |
| 752 if (allocated_young_region != NULL) { | |
| 753 HeapRegion* hr = allocated_young_region; | |
| 754 HeapWord* bottom = hr->bottom(); | |
| 755 HeapWord* end = hr->end(); | |
| 756 MemRegion mr(bottom, end); | |
| 757 ((CardTableModRefBS*)_g1h->barrier_set())->dirty(mr); | |
| 758 } | |
| 759 } | |
| 760 | |
| 761 assert( SafepointSynchronize::is_at_safepoint() || | |
| 762 (res == NULL && Heap_lock->owned_by_self()) || | |
| 763 (res != NULL && !Heap_lock->owned_by_self()), | |
| 764 "post condition of the call" ); | |
| 765 | |
| 766 return res; | |
| 767 } | |
| 768 | |
| 769 HeapWord* | |
| 770 G1CollectedHeap::mem_allocate(size_t word_size, | |
| 771 bool is_noref, | |
| 772 bool is_tlab, | |
| 773 bool* gc_overhead_limit_was_exceeded) { | |
| 774 debug_only(check_for_valid_allocation_state()); | |
| 775 assert(no_gc_in_progress(), "Allocation during gc not allowed"); | |
| 776 HeapWord* result = NULL; | |
| 777 | |
| 778 // Loop until the allocation is satisified, | |
| 779 // or unsatisfied after GC. | |
| 780 for (int try_count = 1; /* return or throw */; try_count += 1) { | |
| 781 int gc_count_before; | |
| 782 { | |
| 783 Heap_lock->lock(); | |
| 784 result = attempt_allocation(word_size); | |
| 785 if (result != NULL) { | |
| 786 // attempt_allocation should have unlocked the heap lock | |
| 787 assert(is_in(result), "result not in heap"); | |
| 788 return result; | |
| 789 } | |
| 790 // Read the gc count while the heap lock is held. | |
| 791 gc_count_before = SharedHeap::heap()->total_collections(); | |
| 792 Heap_lock->unlock(); | |
| 793 } | |
| 794 | |
| 795 // Create the garbage collection operation... | |
| 796 VM_G1CollectForAllocation op(word_size, | |
| 797 gc_count_before); | |
| 798 | |
| 799 // ...and get the VM thread to execute it. | |
| 800 VMThread::execute(&op); | |
| 801 if (op.prologue_succeeded()) { | |
| 802 result = op.result(); | |
| 803 assert(result == NULL || is_in(result), "result not in heap"); | |
| 804 return result; | |
| 805 } | |
| 806 | |
| 807 // Give a warning if we seem to be looping forever. | |
| 808 if ((QueuedAllocationWarningCount > 0) && | |
| 809 (try_count % QueuedAllocationWarningCount == 0)) { | |
| 810 warning("G1CollectedHeap::mem_allocate_work retries %d times", | |
| 811 try_count); | |
| 812 } | |
| 813 } | |
| 814 } | |
| 815 | |
| 816 void G1CollectedHeap::abandon_cur_alloc_region() { | |
| 817 if (_cur_alloc_region != NULL) { | |
| 818 // We're finished with the _cur_alloc_region. | |
| 819 if (_cur_alloc_region->is_empty()) { | |
| 820 _free_regions++; | |
| 821 free_region(_cur_alloc_region); | |
| 822 } else { | |
| 823 _summary_bytes_used += _cur_alloc_region->used(); | |
| 824 } | |
| 825 _cur_alloc_region = NULL; | |
| 826 } | |
| 827 } | |
| 828 | |
| 636 | 829 void G1CollectedHeap::abandon_gc_alloc_regions() { |
| 830 // first, make sure that the GC alloc region list is empty (it should!) | |
| 831 assert(_gc_alloc_region_list == NULL, "invariant"); | |
| 832 release_gc_alloc_regions(true /* totally */); | |
| 833 } | |
| 834 | |
| 342 | 835 class PostMCRemSetClearClosure: public HeapRegionClosure { |
| 836 ModRefBarrierSet* _mr_bs; | |
| 837 public: | |
| 838 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 839 bool doHeapRegion(HeapRegion* r) { | |
| 840 r->reset_gc_time_stamp(); | |
| 841 if (r->continuesHumongous()) | |
| 842 return false; | |
| 843 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 844 if (hrrs != NULL) hrrs->clear(); | |
| 845 // You might think here that we could clear just the cards | |
| 846 // corresponding to the used region. But no: if we leave a dirty card | |
| 847 // in a region we might allocate into, then it would prevent that card | |
| 848 // from being enqueued, and cause it to be missed. | |
| 849 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
| 850 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
| 851 return false; | |
| 852 } | |
| 853 }; | |
| 854 | |
| 855 | |
| 856 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
| 857 ModRefBarrierSet* _mr_bs; | |
| 858 public: | |
| 859 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 860 bool doHeapRegion(HeapRegion* r) { | |
| 861 if (r->continuesHumongous()) return false; | |
| 862 if (r->used_region().word_size() != 0) { | |
| 863 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
| 864 } | |
| 865 return false; | |
| 866 } | |
| 867 }; | |
| 868 | |
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869 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
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870 G1CollectedHeap* _g1h; |
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871 UpdateRSOopClosure _cl; |
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872 int _worker_i; |
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873 public: |
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874 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
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875 _cl(g1->g1_rem_set()->as_HRInto_G1RemSet(), worker_i), |
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876 _worker_i(worker_i), |
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877 _g1h(g1) |
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878 { } |
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879 bool doHeapRegion(HeapRegion* r) { |
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880 if (!r->continuesHumongous()) { |
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881 _cl.set_from(r); |
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882 r->oop_iterate(&_cl); |
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883 } |
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884 return false; |
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885 } |
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886 }; |
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887 |
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888 class ParRebuildRSTask: public AbstractGangTask { |
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889 G1CollectedHeap* _g1; |
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890 public: |
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891 ParRebuildRSTask(G1CollectedHeap* g1) |
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892 : AbstractGangTask("ParRebuildRSTask"), |
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893 _g1(g1) |
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894 { } |
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895 |
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896 void work(int i) { |
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897 RebuildRSOutOfRegionClosure rebuild_rs(_g1, i); |
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898 _g1->heap_region_par_iterate_chunked(&rebuild_rs, i, |
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899 HeapRegion::RebuildRSClaimValue); |
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900 } |
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901 }; |
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902 |
| 342 | 903 void G1CollectedHeap::do_collection(bool full, bool clear_all_soft_refs, |
| 904 size_t word_size) { | |
|
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905 if (GC_locker::check_active_before_gc()) { |
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906 return; // GC is disabled (e.g. JNI GetXXXCritical operation) |
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907 } |
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908 |
| 342 | 909 ResourceMark rm; |
| 910 | |
|
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911 if (PrintHeapAtGC) { |
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912 Universe::print_heap_before_gc(); |
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913 } |
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914 |
| 342 | 915 if (full && DisableExplicitGC) { |
| 916 return; | |
| 917 } | |
| 918 | |
| 919 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
| 920 assert(Thread::current() == VMThread::vm_thread(), "should be in vm thread"); | |
| 921 | |
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922 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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923 collector_policy()->should_clear_all_soft_refs(); |
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924 |
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925 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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926 |
| 342 | 927 { |
| 928 IsGCActiveMark x; | |
| 929 | |
| 930 // Timing | |
| 931 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
| 932 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
|
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933 TraceTime t(full ? "Full GC (System.gc())" : "Full GC", |
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934 PrintGC, true, gclog_or_tty); |
| 342 | 935 |
|
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936 TraceMemoryManagerStats tms(true /* fullGC */); |
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937 |
| 342 | 938 double start = os::elapsedTime(); |
| 939 g1_policy()->record_full_collection_start(); | |
| 940 | |
| 941 gc_prologue(true); | |
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942 increment_total_collections(true /* full gc */); |
| 342 | 943 |
| 944 size_t g1h_prev_used = used(); | |
| 945 assert(used() == recalculate_used(), "Should be equal"); | |
| 946 | |
| 947 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
| 948 HandleMark hm; // Discard invalid handles created during verification | |
| 949 prepare_for_verify(); | |
| 950 gclog_or_tty->print(" VerifyBeforeGC:"); | |
| 951 Universe::verify(true); | |
| 952 } | |
| 953 assert(regions_accounted_for(), "Region leakage!"); | |
| 954 | |
| 955 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 956 | |
| 957 // We want to discover references, but not process them yet. | |
| 958 // This mode is disabled in | |
| 959 // instanceRefKlass::process_discovered_references if the | |
| 960 // generation does some collection work, or | |
| 961 // instanceRefKlass::enqueue_discovered_references if the | |
| 962 // generation returns without doing any work. | |
| 963 ref_processor()->disable_discovery(); | |
| 964 ref_processor()->abandon_partial_discovery(); | |
| 965 ref_processor()->verify_no_references_recorded(); | |
| 966 | |
| 967 // Abandon current iterations of concurrent marking and concurrent | |
| 968 // refinement, if any are in progress. | |
| 969 concurrent_mark()->abort(); | |
| 970 | |
| 971 // Make sure we'll choose a new allocation region afterwards. | |
| 972 abandon_cur_alloc_region(); | |
| 636 | 973 abandon_gc_alloc_regions(); |
| 342 | 974 assert(_cur_alloc_region == NULL, "Invariant."); |
| 975 g1_rem_set()->as_HRInto_G1RemSet()->cleanupHRRS(); | |
| 976 tear_down_region_lists(); | |
| 977 set_used_regions_to_need_zero_fill(); | |
| 978 if (g1_policy()->in_young_gc_mode()) { | |
| 979 empty_young_list(); | |
| 980 g1_policy()->set_full_young_gcs(true); | |
| 981 } | |
| 982 | |
| 983 // Temporarily make reference _discovery_ single threaded (non-MT). | |
| 984 ReferenceProcessorMTMutator rp_disc_ser(ref_processor(), false); | |
| 985 | |
| 986 // Temporarily make refs discovery atomic | |
| 987 ReferenceProcessorAtomicMutator rp_disc_atomic(ref_processor(), true); | |
| 988 | |
| 989 // Temporarily clear _is_alive_non_header | |
| 990 ReferenceProcessorIsAliveMutator rp_is_alive_null(ref_processor(), NULL); | |
| 991 | |
| 992 ref_processor()->enable_discovery(); | |
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993 ref_processor()->setup_policy(do_clear_all_soft_refs); |
| 342 | 994 |
| 995 // Do collection work | |
| 996 { | |
| 997 HandleMark hm; // Discard invalid handles created during gc | |
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998 G1MarkSweep::invoke_at_safepoint(ref_processor(), do_clear_all_soft_refs); |
| 342 | 999 } |
| 1000 // Because freeing humongous regions may have added some unclean | |
| 1001 // regions, it is necessary to tear down again before rebuilding. | |
| 1002 tear_down_region_lists(); | |
| 1003 rebuild_region_lists(); | |
| 1004 | |
| 1005 _summary_bytes_used = recalculate_used(); | |
| 1006 | |
| 1007 ref_processor()->enqueue_discovered_references(); | |
| 1008 | |
| 1009 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 1010 | |
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1011 MemoryService::track_memory_usage(); |
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1012 |
| 342 | 1013 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
| 1014 HandleMark hm; // Discard invalid handles created during verification | |
| 1015 gclog_or_tty->print(" VerifyAfterGC:"); | |
|
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1016 prepare_for_verify(); |
| 342 | 1017 Universe::verify(false); |
| 1018 } | |
| 1019 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); | |
| 1020 | |
| 1021 reset_gc_time_stamp(); | |
| 1022 // Since everything potentially moved, we will clear all remembered | |
|
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1023 // sets, and clear all cards. Later we will rebuild remebered |
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1024 // sets. We will also reset the GC time stamps of the regions. |
| 342 | 1025 PostMCRemSetClearClosure rs_clear(mr_bs()); |
| 1026 heap_region_iterate(&rs_clear); | |
| 1027 | |
| 1028 // Resize the heap if necessary. | |
| 1029 resize_if_necessary_after_full_collection(full ? 0 : word_size); | |
| 1030 | |
| 1031 if (_cg1r->use_cache()) { | |
| 1032 _cg1r->clear_and_record_card_counts(); | |
| 1033 _cg1r->clear_hot_cache(); | |
| 1034 } | |
| 1035 | |
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1036 // Rebuild remembered sets of all regions. |
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1037 if (ParallelGCThreads > 0) { |
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1038 ParRebuildRSTask rebuild_rs_task(this); |
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1039 assert(check_heap_region_claim_values( |
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1040 HeapRegion::InitialClaimValue), "sanity check"); |
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1041 set_par_threads(workers()->total_workers()); |
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1042 workers()->run_task(&rebuild_rs_task); |
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1043 set_par_threads(0); |
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1044 assert(check_heap_region_claim_values( |
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1045 HeapRegion::RebuildRSClaimValue), "sanity check"); |
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1046 reset_heap_region_claim_values(); |
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1047 } else { |
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1048 RebuildRSOutOfRegionClosure rebuild_rs(this); |
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1049 heap_region_iterate(&rebuild_rs); |
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1050 } |
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1051 |
| 342 | 1052 if (PrintGC) { |
| 1053 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
| 1054 } | |
| 1055 | |
| 1056 if (true) { // FIXME | |
| 1057 // Ask the permanent generation to adjust size for full collections | |
| 1058 perm()->compute_new_size(); | |
| 1059 } | |
| 1060 | |
| 1061 double end = os::elapsedTime(); | |
| 1062 g1_policy()->record_full_collection_end(); | |
| 1063 | |
|
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1064 #ifdef TRACESPINNING |
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1065 ParallelTaskTerminator::print_termination_counts(); |
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1066 #endif |
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1067 |
| 342 | 1068 gc_epilogue(true); |
| 1069 | |
| 794 | 1070 // Discard all rset updates |
| 1071 JavaThread::dirty_card_queue_set().abandon_logs(); | |
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1072 assert(!G1DeferredRSUpdate |
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1073 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
| 342 | 1074 assert(regions_accounted_for(), "Region leakage!"); |
| 1075 } | |
| 1076 | |
| 1077 if (g1_policy()->in_young_gc_mode()) { | |
| 1078 _young_list->reset_sampled_info(); | |
| 1079 assert( check_young_list_empty(false, false), | |
| 1080 "young list should be empty at this point"); | |
| 1081 } | |
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1082 |
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1083 if (PrintHeapAtGC) { |
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1084 Universe::print_heap_after_gc(); |
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1085 } |
| 342 | 1086 } |
| 1087 | |
| 1088 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
| 1089 do_collection(true, clear_all_soft_refs, 0); | |
| 1090 } | |
| 1091 | |
| 1092 // This code is mostly copied from TenuredGeneration. | |
| 1093 void | |
| 1094 G1CollectedHeap:: | |
| 1095 resize_if_necessary_after_full_collection(size_t word_size) { | |
| 1096 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
| 1097 | |
| 1098 // Include the current allocation, if any, and bytes that will be | |
| 1099 // pre-allocated to support collections, as "used". | |
| 1100 const size_t used_after_gc = used(); | |
| 1101 const size_t capacity_after_gc = capacity(); | |
| 1102 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
| 1103 | |
| 1104 // We don't have floating point command-line arguments | |
| 1105 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100; | |
| 1106 const double maximum_used_percentage = 1.0 - minimum_free_percentage; | |
| 1107 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100; | |
| 1108 const double minimum_used_percentage = 1.0 - maximum_free_percentage; | |
| 1109 | |
| 1110 size_t minimum_desired_capacity = (size_t) (used_after_gc / maximum_used_percentage); | |
| 1111 size_t maximum_desired_capacity = (size_t) (used_after_gc / minimum_used_percentage); | |
| 1112 | |
| 1113 // Don't shrink less than the initial size. | |
| 1114 minimum_desired_capacity = | |
| 1115 MAX2(minimum_desired_capacity, | |
| 1116 collector_policy()->initial_heap_byte_size()); | |
| 1117 maximum_desired_capacity = | |
| 1118 MAX2(maximum_desired_capacity, | |
| 1119 collector_policy()->initial_heap_byte_size()); | |
| 1120 | |
| 1121 // We are failing here because minimum_desired_capacity is | |
| 1122 assert(used_after_gc <= minimum_desired_capacity, "sanity check"); | |
| 1123 assert(minimum_desired_capacity <= maximum_desired_capacity, "sanity check"); | |
| 1124 | |
| 1125 if (PrintGC && Verbose) { | |
| 1126 const double free_percentage = ((double)free_after_gc) / capacity(); | |
| 1127 gclog_or_tty->print_cr("Computing new size after full GC "); | |
| 1128 gclog_or_tty->print_cr(" " | |
| 1129 " minimum_free_percentage: %6.2f", | |
| 1130 minimum_free_percentage); | |
| 1131 gclog_or_tty->print_cr(" " | |
| 1132 " maximum_free_percentage: %6.2f", | |
| 1133 maximum_free_percentage); | |
| 1134 gclog_or_tty->print_cr(" " | |
| 1135 " capacity: %6.1fK" | |
| 1136 " minimum_desired_capacity: %6.1fK" | |
| 1137 " maximum_desired_capacity: %6.1fK", | |
| 1138 capacity() / (double) K, | |
| 1139 minimum_desired_capacity / (double) K, | |
| 1140 maximum_desired_capacity / (double) K); | |
| 1141 gclog_or_tty->print_cr(" " | |
| 1142 " free_after_gc : %6.1fK" | |
| 1143 " used_after_gc : %6.1fK", | |
| 1144 free_after_gc / (double) K, | |
| 1145 used_after_gc / (double) K); | |
| 1146 gclog_or_tty->print_cr(" " | |
| 1147 " free_percentage: %6.2f", | |
| 1148 free_percentage); | |
| 1149 } | |
| 1150 if (capacity() < minimum_desired_capacity) { | |
| 1151 // Don't expand unless it's significant | |
| 1152 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
| 1153 expand(expand_bytes); | |
| 1154 if (PrintGC && Verbose) { | |
| 1155 gclog_or_tty->print_cr(" expanding:" | |
| 1156 " minimum_desired_capacity: %6.1fK" | |
| 1157 " expand_bytes: %6.1fK", | |
| 1158 minimum_desired_capacity / (double) K, | |
| 1159 expand_bytes / (double) K); | |
| 1160 } | |
| 1161 | |
| 1162 // No expansion, now see if we want to shrink | |
| 1163 } else if (capacity() > maximum_desired_capacity) { | |
| 1164 // Capacity too large, compute shrinking size | |
| 1165 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
| 1166 shrink(shrink_bytes); | |
| 1167 if (PrintGC && Verbose) { | |
| 1168 gclog_or_tty->print_cr(" " | |
| 1169 " shrinking:" | |
| 1170 " initSize: %.1fK" | |
| 1171 " maximum_desired_capacity: %.1fK", | |
| 1172 collector_policy()->initial_heap_byte_size() / (double) K, | |
| 1173 maximum_desired_capacity / (double) K); | |
| 1174 gclog_or_tty->print_cr(" " | |
| 1175 " shrink_bytes: %.1fK", | |
| 1176 shrink_bytes / (double) K); | |
| 1177 } | |
| 1178 } | |
| 1179 } | |
| 1180 | |
| 1181 | |
| 1182 HeapWord* | |
| 1183 G1CollectedHeap::satisfy_failed_allocation(size_t word_size) { | |
| 1184 HeapWord* result = NULL; | |
| 1185 | |
| 1186 // In a G1 heap, we're supposed to keep allocation from failing by | |
| 1187 // incremental pauses. Therefore, at least for now, we'll favor | |
| 1188 // expansion over collection. (This might change in the future if we can | |
| 1189 // do something smarter than full collection to satisfy a failed alloc.) | |
| 1190 | |
| 1191 result = expand_and_allocate(word_size); | |
| 1192 if (result != NULL) { | |
| 1193 assert(is_in(result), "result not in heap"); | |
| 1194 return result; | |
| 1195 } | |
| 1196 | |
| 1197 // OK, I guess we have to try collection. | |
| 1198 | |
| 1199 do_collection(false, false, word_size); | |
| 1200 | |
| 1201 result = attempt_allocation(word_size, /*permit_collection_pause*/false); | |
| 1202 | |
| 1203 if (result != NULL) { | |
| 1204 assert(is_in(result), "result not in heap"); | |
| 1205 return result; | |
| 1206 } | |
| 1207 | |
| 1208 // Try collecting soft references. | |
| 1209 do_collection(false, true, word_size); | |
| 1210 result = attempt_allocation(word_size, /*permit_collection_pause*/false); | |
| 1211 if (result != NULL) { | |
| 1212 assert(is_in(result), "result not in heap"); | |
| 1213 return result; | |
| 1214 } | |
| 1215 | |
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1216 assert(!collector_policy()->should_clear_all_soft_refs(), |
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1217 "Flag should have been handled and cleared prior to this point"); |
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1218 |
| 342 | 1219 // What else? We might try synchronous finalization later. If the total |
| 1220 // space available is large enough for the allocation, then a more | |
| 1221 // complete compaction phase than we've tried so far might be | |
| 1222 // appropriate. | |
| 1223 return NULL; | |
| 1224 } | |
| 1225 | |
| 1226 // Attempting to expand the heap sufficiently | |
| 1227 // to support an allocation of the given "word_size". If | |
| 1228 // successful, perform the allocation and return the address of the | |
| 1229 // allocated block, or else "NULL". | |
| 1230 | |
| 1231 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
| 1232 size_t expand_bytes = word_size * HeapWordSize; | |
| 1233 if (expand_bytes < MinHeapDeltaBytes) { | |
| 1234 expand_bytes = MinHeapDeltaBytes; | |
| 1235 } | |
| 1236 expand(expand_bytes); | |
| 1237 assert(regions_accounted_for(), "Region leakage!"); | |
| 1238 HeapWord* result = attempt_allocation(word_size, false /* permit_collection_pause */); | |
| 1239 return result; | |
| 1240 } | |
| 1241 | |
| 1242 size_t G1CollectedHeap::free_region_if_totally_empty(HeapRegion* hr) { | |
| 1243 size_t pre_used = 0; | |
| 1244 size_t cleared_h_regions = 0; | |
| 1245 size_t freed_regions = 0; | |
| 1246 UncleanRegionList local_list; | |
| 1247 free_region_if_totally_empty_work(hr, pre_used, cleared_h_regions, | |
| 1248 freed_regions, &local_list); | |
| 1249 | |
| 1250 finish_free_region_work(pre_used, cleared_h_regions, freed_regions, | |
| 1251 &local_list); | |
| 1252 return pre_used; | |
| 1253 } | |
| 1254 | |
| 1255 void | |
| 1256 G1CollectedHeap::free_region_if_totally_empty_work(HeapRegion* hr, | |
| 1257 size_t& pre_used, | |
| 1258 size_t& cleared_h, | |
| 1259 size_t& freed_regions, | |
| 1260 UncleanRegionList* list, | |
| 1261 bool par) { | |
| 1262 assert(!hr->continuesHumongous(), "should have filtered these out"); | |
| 1263 size_t res = 0; | |
| 677 | 1264 if (hr->used() > 0 && hr->garbage_bytes() == hr->used() && |
| 1265 !hr->is_young()) { | |
| 1266 if (G1PolicyVerbose > 0) | |
| 1267 gclog_or_tty->print_cr("Freeing empty region "PTR_FORMAT "(" SIZE_FORMAT " bytes)" | |
| 1268 " during cleanup", hr, hr->used()); | |
| 1269 free_region_work(hr, pre_used, cleared_h, freed_regions, list, par); | |
| 342 | 1270 } |
| 1271 } | |
| 1272 | |
| 1273 // FIXME: both this and shrink could probably be more efficient by | |
| 1274 // doing one "VirtualSpace::expand_by" call rather than several. | |
| 1275 void G1CollectedHeap::expand(size_t expand_bytes) { | |
| 1276 size_t old_mem_size = _g1_storage.committed_size(); | |
| 1277 // We expand by a minimum of 1K. | |
| 1278 expand_bytes = MAX2(expand_bytes, (size_t)K); | |
| 1279 size_t aligned_expand_bytes = | |
| 1280 ReservedSpace::page_align_size_up(expand_bytes); | |
| 1281 aligned_expand_bytes = align_size_up(aligned_expand_bytes, | |
| 1282 HeapRegion::GrainBytes); | |
| 1283 expand_bytes = aligned_expand_bytes; | |
| 1284 while (expand_bytes > 0) { | |
| 1285 HeapWord* base = (HeapWord*)_g1_storage.high(); | |
| 1286 // Commit more storage. | |
| 1287 bool successful = _g1_storage.expand_by(HeapRegion::GrainBytes); | |
| 1288 if (!successful) { | |
| 1289 expand_bytes = 0; | |
| 1290 } else { | |
| 1291 expand_bytes -= HeapRegion::GrainBytes; | |
| 1292 // Expand the committed region. | |
| 1293 HeapWord* high = (HeapWord*) _g1_storage.high(); | |
| 1294 _g1_committed.set_end(high); | |
| 1295 // Create a new HeapRegion. | |
| 1296 MemRegion mr(base, high); | |
| 1297 bool is_zeroed = !_g1_max_committed.contains(base); | |
| 1298 HeapRegion* hr = new HeapRegion(_bot_shared, mr, is_zeroed); | |
| 1299 | |
| 1300 // Now update max_committed if necessary. | |
| 1301 _g1_max_committed.set_end(MAX2(_g1_max_committed.end(), high)); | |
| 1302 | |
| 1303 // Add it to the HeapRegionSeq. | |
| 1304 _hrs->insert(hr); | |
| 1305 // Set the zero-fill state, according to whether it's already | |
| 1306 // zeroed. | |
| 1307 { | |
| 1308 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 1309 if (is_zeroed) { | |
| 1310 hr->set_zero_fill_complete(); | |
| 1311 put_free_region_on_list_locked(hr); | |
| 1312 } else { | |
| 1313 hr->set_zero_fill_needed(); | |
| 1314 put_region_on_unclean_list_locked(hr); | |
| 1315 } | |
| 1316 } | |
| 1317 _free_regions++; | |
| 1318 // And we used up an expansion region to create it. | |
| 1319 _expansion_regions--; | |
| 1320 // Tell the cardtable about it. | |
| 1321 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
| 1322 // And the offset table as well. | |
| 1323 _bot_shared->resize(_g1_committed.word_size()); | |
| 1324 } | |
| 1325 } | |
| 1326 if (Verbose && PrintGC) { | |
| 1327 size_t new_mem_size = _g1_storage.committed_size(); | |
| 1328 gclog_or_tty->print_cr("Expanding garbage-first heap from %ldK by %ldK to %ldK", | |
| 1329 old_mem_size/K, aligned_expand_bytes/K, | |
| 1330 new_mem_size/K); | |
| 1331 } | |
| 1332 } | |
| 1333 | |
| 1334 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) | |
| 1335 { | |
| 1336 size_t old_mem_size = _g1_storage.committed_size(); | |
| 1337 size_t aligned_shrink_bytes = | |
| 1338 ReservedSpace::page_align_size_down(shrink_bytes); | |
| 1339 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
| 1340 HeapRegion::GrainBytes); | |
| 1341 size_t num_regions_deleted = 0; | |
| 1342 MemRegion mr = _hrs->shrink_by(aligned_shrink_bytes, num_regions_deleted); | |
| 1343 | |
| 1344 assert(mr.end() == (HeapWord*)_g1_storage.high(), "Bad shrink!"); | |
| 1345 if (mr.byte_size() > 0) | |
| 1346 _g1_storage.shrink_by(mr.byte_size()); | |
| 1347 assert(mr.start() == (HeapWord*)_g1_storage.high(), "Bad shrink!"); | |
| 1348 | |
| 1349 _g1_committed.set_end(mr.start()); | |
| 1350 _free_regions -= num_regions_deleted; | |
| 1351 _expansion_regions += num_regions_deleted; | |
| 1352 | |
| 1353 // Tell the cardtable about it. | |
| 1354 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
| 1355 | |
| 1356 // And the offset table as well. | |
| 1357 _bot_shared->resize(_g1_committed.word_size()); | |
| 1358 | |
| 1359 HeapRegionRemSet::shrink_heap(n_regions()); | |
| 1360 | |
| 1361 if (Verbose && PrintGC) { | |
| 1362 size_t new_mem_size = _g1_storage.committed_size(); | |
| 1363 gclog_or_tty->print_cr("Shrinking garbage-first heap from %ldK by %ldK to %ldK", | |
| 1364 old_mem_size/K, aligned_shrink_bytes/K, | |
| 1365 new_mem_size/K); | |
| 1366 } | |
| 1367 } | |
| 1368 | |
| 1369 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
| 636 | 1370 release_gc_alloc_regions(true /* totally */); |
| 342 | 1371 tear_down_region_lists(); // We will rebuild them in a moment. |
| 1372 shrink_helper(shrink_bytes); | |
| 1373 rebuild_region_lists(); | |
| 1374 } | |
| 1375 | |
| 1376 // Public methods. | |
| 1377 | |
| 1378 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 1379 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 1380 #endif // _MSC_VER | |
| 1381 | |
| 1382 | |
| 1383 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
| 1384 SharedHeap(policy_), | |
| 1385 _g1_policy(policy_), | |
| 1111 | 1386 _dirty_card_queue_set(false), |
| 342 | 1387 _ref_processor(NULL), |
| 1388 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), | |
| 1389 _bot_shared(NULL), | |
| 1390 _par_alloc_during_gc_lock(Mutex::leaf, "par alloc during GC lock"), | |
| 1391 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
| 1392 _evac_failure_scan_stack(NULL) , | |
| 1393 _mark_in_progress(false), | |
| 1394 _cg1r(NULL), _czft(NULL), _summary_bytes_used(0), | |
| 1395 _cur_alloc_region(NULL), | |
| 1396 _refine_cte_cl(NULL), | |
| 1397 _free_region_list(NULL), _free_region_list_size(0), | |
| 1398 _free_regions(0), | |
| 1399 _full_collection(false), | |
| 1400 _unclean_region_list(), | |
| 1401 _unclean_regions_coming(false), | |
| 1402 _young_list(new YoungList(this)), | |
| 1403 _gc_time_stamp(0), | |
| 526 | 1404 _surviving_young_words(NULL), |
| 1405 _in_cset_fast_test(NULL), | |
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1406 _in_cset_fast_test_base(NULL), |
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1407 _dirty_cards_region_list(NULL) { |
| 342 | 1408 _g1h = this; // To catch bugs. |
| 1409 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
| 1410 vm_exit_during_initialization("Failed necessary allocation."); | |
| 1411 } | |
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1412 |
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1413 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1414 |
| 342 | 1415 int n_queues = MAX2((int)ParallelGCThreads, 1); |
| 1416 _task_queues = new RefToScanQueueSet(n_queues); | |
| 1417 | |
| 1418 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
| 1419 assert(n_rem_sets > 0, "Invariant."); | |
| 1420 | |
| 1421 HeapRegionRemSetIterator** iter_arr = | |
| 1422 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
| 1423 for (int i = 0; i < n_queues; i++) { | |
| 1424 iter_arr[i] = new HeapRegionRemSetIterator(); | |
| 1425 } | |
| 1426 _rem_set_iterator = iter_arr; | |
| 1427 | |
| 1428 for (int i = 0; i < n_queues; i++) { | |
| 1429 RefToScanQueue* q = new RefToScanQueue(); | |
| 1430 q->initialize(); | |
| 1431 _task_queues->register_queue(i, q); | |
| 1432 } | |
| 1433 | |
| 1434 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 636 | 1435 _gc_alloc_regions[ap] = NULL; |
| 1436 _gc_alloc_region_counts[ap] = 0; | |
| 1437 _retained_gc_alloc_regions[ap] = NULL; | |
| 1438 // by default, we do not retain a GC alloc region for each ap; | |
| 1439 // we'll override this, when appropriate, below | |
| 1440 _retain_gc_alloc_region[ap] = false; | |
| 1441 } | |
| 1442 | |
| 1443 // We will try to remember the last half-full tenured region we | |
| 1444 // allocated to at the end of a collection so that we can re-use it | |
| 1445 // during the next collection. | |
| 1446 _retain_gc_alloc_region[GCAllocForTenured] = true; | |
| 1447 | |
| 342 | 1448 guarantee(_task_queues != NULL, "task_queues allocation failure."); |
| 1449 } | |
| 1450 | |
| 1451 jint G1CollectedHeap::initialize() { | |
| 1166 | 1452 CollectedHeap::pre_initialize(); |
| 342 | 1453 os::enable_vtime(); |
| 1454 | |
| 1455 // Necessary to satisfy locking discipline assertions. | |
| 1456 | |
| 1457 MutexLocker x(Heap_lock); | |
| 1458 | |
| 1459 // While there are no constraints in the GC code that HeapWordSize | |
| 1460 // be any particular value, there are multiple other areas in the | |
| 1461 // system which believe this to be true (e.g. oop->object_size in some | |
| 1462 // cases incorrectly returns the size in wordSize units rather than | |
| 1463 // HeapWordSize). | |
| 1464 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
| 1465 | |
| 1466 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
| 1467 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
| 1468 | |
| 1469 // Ensure that the sizes are properly aligned. | |
| 1470 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1471 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1472 | |
| 1473 _cg1r = new ConcurrentG1Refine(); | |
| 1474 | |
| 1475 // Reserve the maximum. | |
| 1476 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
| 1477 // Includes the perm-gen. | |
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1478 |
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1479 const size_t total_reserved = max_byte_size + pgs->max_size(); |
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1480 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1481 |
| 342 | 1482 ReservedSpace heap_rs(max_byte_size + pgs->max_size(), |
| 1483 HeapRegion::GrainBytes, | |
|
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1484 false /*ism*/, addr); |
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1485 |
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1486 if (UseCompressedOops) { |
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1487 if (addr != NULL && !heap_rs.is_reserved()) { |
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1488 // Failed to reserve at specified address - the requested memory |
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1489 // region is taken already, for example, by 'java' launcher. |
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1490 // Try again to reserver heap higher. |
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1491 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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1492 ReservedSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1493 false /*ism*/, addr); |
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1494 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1495 // Failed to reserve at specified address again - give up. |
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1496 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1497 assert(addr == NULL, ""); |
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1498 ReservedSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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1499 false /*ism*/, addr); |
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1500 heap_rs = heap_rs1; |
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1501 } else { |
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1502 heap_rs = heap_rs0; |
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1503 } |
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1504 } |
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1505 } |
| 342 | 1506 |
| 1507 if (!heap_rs.is_reserved()) { | |
| 1508 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
| 1509 return JNI_ENOMEM; | |
| 1510 } | |
| 1511 | |
| 1512 // It is important to do this in a way such that concurrent readers can't | |
| 1513 // temporarily think somethings in the heap. (I've actually seen this | |
| 1514 // happen in asserts: DLD.) | |
| 1515 _reserved.set_word_size(0); | |
| 1516 _reserved.set_start((HeapWord*)heap_rs.base()); | |
| 1517 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 1518 | |
| 1519 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
| 1520 | |
| 1521 _num_humongous_regions = 0; | |
| 1522 | |
| 1523 // Create the gen rem set (and barrier set) for the entire reserved region. | |
| 1524 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
| 1525 set_barrier_set(rem_set()->bs()); | |
| 1526 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
| 1527 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
| 1528 } else { | |
| 1529 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
| 1530 return JNI_ENOMEM; | |
| 1531 } | |
| 1532 | |
| 1533 // Also create a G1 rem set. | |
| 1534 if (G1UseHRIntoRS) { | |
| 1535 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { | |
| 1536 _g1_rem_set = new HRInto_G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
| 1537 } else { | |
| 1538 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); | |
| 1539 return JNI_ENOMEM; | |
| 1540 } | |
| 1541 } else { | |
| 1542 _g1_rem_set = new StupidG1RemSet(this); | |
| 1543 } | |
| 1544 | |
| 1545 // Carve out the G1 part of the heap. | |
| 1546 | |
| 1547 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
| 1548 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
| 1549 g1_rs.size()/HeapWordSize); | |
| 1550 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
| 1551 | |
| 1552 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
| 1553 | |
| 1554 _g1_storage.initialize(g1_rs, 0); | |
| 1555 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
| 1556 _g1_max_committed = _g1_committed; | |
| 393 | 1557 _hrs = new HeapRegionSeq(_expansion_regions); |
| 342 | 1558 guarantee(_hrs != NULL, "Couldn't allocate HeapRegionSeq"); |
| 1559 guarantee(_cur_alloc_region == NULL, "from constructor"); | |
| 1560 | |
|
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1561 // 6843694 - ensure that the maximum region index can fit |
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1562 // in the remembered set structures. |
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1563 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
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1564 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
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1565 |
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1566 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
|
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1567 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
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1568 guarantee((size_t) HeapRegion::CardsPerRegion < max_cards_per_region, |
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1569 "too many cards per region"); |
|
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1570 |
| 342 | 1571 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
| 1572 heap_word_size(init_byte_size)); | |
| 1573 | |
| 1574 _g1h = this; | |
| 1575 | |
| 1576 // Create the ConcurrentMark data structure and thread. | |
| 1577 // (Must do this late, so that "max_regions" is defined.) | |
| 1578 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
| 1579 _cmThread = _cm->cmThread(); | |
| 1580 | |
| 1581 // ...and the concurrent zero-fill thread, if necessary. | |
| 1582 if (G1ConcZeroFill) { | |
| 1583 _czft = new ConcurrentZFThread(); | |
| 1584 } | |
| 1585 | |
| 1586 // Initialize the from_card cache structure of HeapRegionRemSet. | |
| 1587 HeapRegionRemSet::init_heap(max_regions()); | |
| 1588 | |
| 677 | 1589 // Now expand into the initial heap size. |
| 1590 expand(init_byte_size); | |
| 342 | 1591 |
| 1592 // Perform any initialization actions delegated to the policy. | |
| 1593 g1_policy()->init(); | |
| 1594 | |
| 1595 g1_policy()->note_start_of_mark_thread(); | |
| 1596 | |
| 1597 _refine_cte_cl = | |
| 1598 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
| 1599 g1_rem_set(), | |
| 1600 concurrent_g1_refine()); | |
| 1601 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 1602 | |
| 1603 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
| 1604 SATB_Q_FL_lock, | |
| 1111 | 1605 G1SATBProcessCompletedThreshold, |
| 342 | 1606 Shared_SATB_Q_lock); |
| 794 | 1607 |
| 1608 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
| 1609 DirtyCardQ_FL_lock, | |
| 1111 | 1610 concurrent_g1_refine()->yellow_zone(), |
| 1611 concurrent_g1_refine()->red_zone(), | |
| 794 | 1612 Shared_DirtyCardQ_lock); |
| 1613 | |
|
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1614 if (G1DeferredRSUpdate) { |
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1615 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
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1616 DirtyCardQ_FL_lock, |
| 1111 | 1617 -1, // never trigger processing |
| 1618 -1, // no limit on length | |
|
616
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1619 Shared_DirtyCardQ_lock, |
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1620 &JavaThread::dirty_card_queue_set()); |
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1621 } |
| 342 | 1622 // In case we're keeping closure specialization stats, initialize those |
| 1623 // counts and that mechanism. | |
| 1624 SpecializationStats::clear(); | |
| 1625 | |
| 1626 _gc_alloc_region_list = NULL; | |
| 1627 | |
| 1628 // Do later initialization work for concurrent refinement. | |
| 1629 _cg1r->init(); | |
| 1630 | |
| 1631 return JNI_OK; | |
| 1632 } | |
| 1633 | |
| 1634 void G1CollectedHeap::ref_processing_init() { | |
| 1635 SharedHeap::ref_processing_init(); | |
| 1636 MemRegion mr = reserved_region(); | |
| 1637 _ref_processor = ReferenceProcessor::create_ref_processor( | |
| 1638 mr, // span | |
| 1639 false, // Reference discovery is not atomic | |
| 1640 // (though it shouldn't matter here.) | |
| 1641 true, // mt_discovery | |
| 1642 NULL, // is alive closure: need to fill this in for efficiency | |
| 1643 ParallelGCThreads, | |
| 1644 ParallelRefProcEnabled, | |
| 1645 true); // Setting next fields of discovered | |
| 1646 // lists requires a barrier. | |
| 1647 } | |
| 1648 | |
| 1649 size_t G1CollectedHeap::capacity() const { | |
| 1650 return _g1_committed.byte_size(); | |
| 1651 } | |
| 1652 | |
| 1653 void G1CollectedHeap::iterate_dirty_card_closure(bool concurrent, | |
| 1654 int worker_i) { | |
| 889 | 1655 // Clean cards in the hot card cache |
| 1656 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set()); | |
| 1657 | |
| 342 | 1658 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
| 1659 int n_completed_buffers = 0; | |
| 1660 while (dcqs.apply_closure_to_completed_buffer(worker_i, 0, true)) { | |
| 1661 n_completed_buffers++; | |
| 1662 } | |
| 1663 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
| 1664 (double) n_completed_buffers); | |
| 1665 dcqs.clear_n_completed_buffers(); | |
| 1666 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
| 1667 } | |
| 1668 | |
| 1669 | |
| 1670 // Computes the sum of the storage used by the various regions. | |
| 1671 | |
| 1672 size_t G1CollectedHeap::used() const { | |
|
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1673 assert(Heap_lock->owner() != NULL, |
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1674 "Should be owned on this thread's behalf."); |
| 342 | 1675 size_t result = _summary_bytes_used; |
|
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1676 // Read only once in case it is set to NULL concurrently |
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1677 HeapRegion* hr = _cur_alloc_region; |
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1678 if (hr != NULL) |
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1679 result += hr->used(); |
| 342 | 1680 return result; |
| 1681 } | |
| 1682 | |
|
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1683 size_t G1CollectedHeap::used_unlocked() const { |
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1684 size_t result = _summary_bytes_used; |
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1685 return result; |
|
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1686 } |
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1687 |
| 342 | 1688 class SumUsedClosure: public HeapRegionClosure { |
| 1689 size_t _used; | |
| 1690 public: | |
| 1691 SumUsedClosure() : _used(0) {} | |
| 1692 bool doHeapRegion(HeapRegion* r) { | |
| 1693 if (!r->continuesHumongous()) { | |
| 1694 _used += r->used(); | |
| 1695 } | |
| 1696 return false; | |
| 1697 } | |
| 1698 size_t result() { return _used; } | |
| 1699 }; | |
| 1700 | |
| 1701 size_t G1CollectedHeap::recalculate_used() const { | |
| 1702 SumUsedClosure blk; | |
| 1703 _hrs->iterate(&blk); | |
| 1704 return blk.result(); | |
| 1705 } | |
| 1706 | |
| 1707 #ifndef PRODUCT | |
| 1708 class SumUsedRegionsClosure: public HeapRegionClosure { | |
| 1709 size_t _num; | |
| 1710 public: | |
| 677 | 1711 SumUsedRegionsClosure() : _num(0) {} |
| 342 | 1712 bool doHeapRegion(HeapRegion* r) { |
| 1713 if (r->continuesHumongous() || r->used() > 0 || r->is_gc_alloc_region()) { | |
| 1714 _num += 1; | |
| 1715 } | |
| 1716 return false; | |
| 1717 } | |
| 1718 size_t result() { return _num; } | |
| 1719 }; | |
| 1720 | |
| 1721 size_t G1CollectedHeap::recalculate_used_regions() const { | |
| 1722 SumUsedRegionsClosure blk; | |
| 1723 _hrs->iterate(&blk); | |
| 1724 return blk.result(); | |
| 1725 } | |
| 1726 #endif // PRODUCT | |
| 1727 | |
| 1728 size_t G1CollectedHeap::unsafe_max_alloc() { | |
| 1729 if (_free_regions > 0) return HeapRegion::GrainBytes; | |
| 1730 // otherwise, is there space in the current allocation region? | |
| 1731 | |
| 1732 // We need to store the current allocation region in a local variable | |
| 1733 // here. The problem is that this method doesn't take any locks and | |
| 1734 // there may be other threads which overwrite the current allocation | |
| 1735 // region field. attempt_allocation(), for example, sets it to NULL | |
| 1736 // and this can happen *after* the NULL check here but before the call | |
| 1737 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
| 1738 // to be a problem in the optimized build, since the two loads of the | |
| 1739 // current allocation region field are optimized away. | |
| 1740 HeapRegion* car = _cur_alloc_region; | |
| 1741 | |
| 1742 // FIXME: should iterate over all regions? | |
| 1743 if (car == NULL) { | |
| 1744 return 0; | |
| 1745 } | |
| 1746 return car->free(); | |
| 1747 } | |
| 1748 | |
| 1749 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { | |
| 1750 assert(Thread::current()->is_VM_thread(), "Precondition#1"); | |
| 1751 assert(Heap_lock->is_locked(), "Precondition#2"); | |
| 1752 GCCauseSetter gcs(this, cause); | |
| 1753 switch (cause) { | |
| 1754 case GCCause::_heap_inspection: | |
| 1755 case GCCause::_heap_dump: { | |
| 1756 HandleMark hm; | |
| 1757 do_full_collection(false); // don't clear all soft refs | |
| 1758 break; | |
| 1759 } | |
| 1760 default: // XXX FIX ME | |
| 1761 ShouldNotReachHere(); // Unexpected use of this function | |
| 1762 } | |
| 1763 } | |
| 1764 | |
|
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1765 void G1CollectedHeap::collect(GCCause::Cause cause) { |
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1766 // The caller doesn't have the Heap_lock |
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1767 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
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1768 |
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1769 int gc_count_before; |
| 342 | 1770 { |
|
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1771 MutexLocker ml(Heap_lock); |
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1772 // Read the GC count while holding the Heap_lock |
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1773 gc_count_before = SharedHeap::heap()->total_collections(); |
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1774 |
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1775 // Don't want to do a GC until cleanup is completed. |
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1776 wait_for_cleanup_complete(); |
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1777 } // We give up heap lock; VMThread::execute gets it back below |
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1778 switch (cause) { |
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1779 case GCCause::_scavenge_alot: { |
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1780 // Do an incremental pause, which might sometimes be abandoned. |
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1781 VM_G1IncCollectionPause op(gc_count_before, cause); |
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1782 VMThread::execute(&op); |
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1783 break; |
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1784 } |
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1785 default: { |
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1786 // In all other cases, we currently do a full gc. |
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1787 VM_G1CollectFull op(gc_count_before, cause); |
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1788 VMThread::execute(&op); |
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1789 } |
| 342 | 1790 } |
| 1791 } | |
| 1792 | |
| 1793 bool G1CollectedHeap::is_in(const void* p) const { | |
| 1794 if (_g1_committed.contains(p)) { | |
| 1795 HeapRegion* hr = _hrs->addr_to_region(p); | |
| 1796 return hr->is_in(p); | |
| 1797 } else { | |
| 1798 return _perm_gen->as_gen()->is_in(p); | |
| 1799 } | |
| 1800 } | |
| 1801 | |
| 1802 // Iteration functions. | |
| 1803 | |
| 1804 // Iterates an OopClosure over all ref-containing fields of objects | |
| 1805 // within a HeapRegion. | |
| 1806 | |
| 1807 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
| 1808 MemRegion _mr; | |
| 1809 OopClosure* _cl; | |
| 1810 public: | |
| 1811 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
| 1812 : _mr(mr), _cl(cl) {} | |
| 1813 bool doHeapRegion(HeapRegion* r) { | |
| 1814 if (! r->continuesHumongous()) { | |
| 1815 r->oop_iterate(_cl); | |
| 1816 } | |
| 1817 return false; | |
| 1818 } | |
| 1819 }; | |
| 1820 | |
| 678 | 1821 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
| 342 | 1822 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
| 1823 _hrs->iterate(&blk); | |
| 678 | 1824 if (do_perm) { |
| 1825 perm_gen()->oop_iterate(cl); | |
| 1826 } | |
| 342 | 1827 } |
| 1828 | |
| 678 | 1829 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
| 342 | 1830 IterateOopClosureRegionClosure blk(mr, cl); |
| 1831 _hrs->iterate(&blk); | |
| 678 | 1832 if (do_perm) { |
| 1833 perm_gen()->oop_iterate(cl); | |
| 1834 } | |
| 342 | 1835 } |
| 1836 | |
| 1837 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
| 1838 | |
| 1839 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
| 1840 ObjectClosure* _cl; | |
| 1841 public: | |
| 1842 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
| 1843 bool doHeapRegion(HeapRegion* r) { | |
| 1844 if (! r->continuesHumongous()) { | |
| 1845 r->object_iterate(_cl); | |
| 1846 } | |
| 1847 return false; | |
| 1848 } | |
| 1849 }; | |
| 1850 | |
| 678 | 1851 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
| 342 | 1852 IterateObjectClosureRegionClosure blk(cl); |
| 1853 _hrs->iterate(&blk); | |
| 678 | 1854 if (do_perm) { |
| 1855 perm_gen()->object_iterate(cl); | |
| 1856 } | |
| 342 | 1857 } |
| 1858 | |
| 1859 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
| 1860 // FIXME: is this right? | |
| 1861 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
| 1862 } | |
| 1863 | |
| 1864 // Calls a SpaceClosure on a HeapRegion. | |
| 1865 | |
| 1866 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
| 1867 SpaceClosure* _cl; | |
| 1868 public: | |
| 1869 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
| 1870 bool doHeapRegion(HeapRegion* r) { | |
| 1871 _cl->do_space(r); | |
| 1872 return false; | |
| 1873 } | |
| 1874 }; | |
| 1875 | |
| 1876 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
| 1877 SpaceClosureRegionClosure blk(cl); | |
| 1878 _hrs->iterate(&blk); | |
| 1879 } | |
| 1880 | |
| 1881 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) { | |
| 1882 _hrs->iterate(cl); | |
| 1883 } | |
| 1884 | |
| 1885 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
| 1886 HeapRegionClosure* cl) { | |
| 1887 _hrs->iterate_from(r, cl); | |
| 1888 } | |
| 1889 | |
| 1890 void | |
| 1891 G1CollectedHeap::heap_region_iterate_from(int idx, HeapRegionClosure* cl) { | |
| 1892 _hrs->iterate_from(idx, cl); | |
| 1893 } | |
| 1894 | |
| 1895 HeapRegion* G1CollectedHeap::region_at(size_t idx) { return _hrs->at(idx); } | |
| 1896 | |
| 1897 void | |
| 1898 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
| 1899 int worker, | |
| 1900 jint claim_value) { | |
| 355 | 1901 const size_t regions = n_regions(); |
| 1902 const size_t worker_num = (ParallelGCThreads > 0 ? ParallelGCThreads : 1); | |
| 1903 // try to spread out the starting points of the workers | |
| 1904 const size_t start_index = regions / worker_num * (size_t) worker; | |
| 1905 | |
| 1906 // each worker will actually look at all regions | |
| 1907 for (size_t count = 0; count < regions; ++count) { | |
| 1908 const size_t index = (start_index + count) % regions; | |
| 1909 assert(0 <= index && index < regions, "sanity"); | |
| 1910 HeapRegion* r = region_at(index); | |
| 1911 // we'll ignore "continues humongous" regions (we'll process them | |
| 1912 // when we come across their corresponding "start humongous" | |
| 1913 // region) and regions already claimed | |
| 1914 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
| 1915 continue; | |
| 1916 } | |
| 1917 // OK, try to claim it | |
| 342 | 1918 if (r->claimHeapRegion(claim_value)) { |
| 355 | 1919 // success! |
| 1920 assert(!r->continuesHumongous(), "sanity"); | |
| 1921 if (r->startsHumongous()) { | |
| 1922 // If the region is "starts humongous" we'll iterate over its | |
| 1923 // "continues humongous" first; in fact we'll do them | |
| 1924 // first. The order is important. In on case, calling the | |
| 1925 // closure on the "starts humongous" region might de-allocate | |
| 1926 // and clear all its "continues humongous" regions and, as a | |
| 1927 // result, we might end up processing them twice. So, we'll do | |
| 1928 // them first (notice: most closures will ignore them anyway) and | |
| 1929 // then we'll do the "starts humongous" region. | |
| 1930 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
| 1931 HeapRegion* chr = region_at(ch_index); | |
| 1932 | |
| 1933 // if the region has already been claimed or it's not | |
| 1934 // "continues humongous" we're done | |
| 1935 if (chr->claim_value() == claim_value || | |
| 1936 !chr->continuesHumongous()) { | |
| 1937 break; | |
| 1938 } | |
| 1939 | |
| 1940 // Noone should have claimed it directly. We can given | |
| 1941 // that we claimed its "starts humongous" region. | |
| 1942 assert(chr->claim_value() != claim_value, "sanity"); | |
| 1943 assert(chr->humongous_start_region() == r, "sanity"); | |
| 1944 | |
| 1945 if (chr->claimHeapRegion(claim_value)) { | |
| 1946 // we should always be able to claim it; noone else should | |
| 1947 // be trying to claim this region | |
| 1948 | |
| 1949 bool res2 = cl->doHeapRegion(chr); | |
| 1950 assert(!res2, "Should not abort"); | |
| 1951 | |
| 1952 // Right now, this holds (i.e., no closure that actually | |
| 1953 // does something with "continues humongous" regions | |
| 1954 // clears them). We might have to weaken it in the future, | |
| 1955 // but let's leave these two asserts here for extra safety. | |
| 1956 assert(chr->continuesHumongous(), "should still be the case"); | |
| 1957 assert(chr->humongous_start_region() == r, "sanity"); | |
| 1958 } else { | |
| 1959 guarantee(false, "we should not reach here"); | |
| 1960 } | |
| 1961 } | |
| 1962 } | |
| 1963 | |
| 1964 assert(!r->continuesHumongous(), "sanity"); | |
| 1965 bool res = cl->doHeapRegion(r); | |
| 1966 assert(!res, "Should not abort"); | |
| 1967 } | |
| 1968 } | |
| 1969 } | |
| 1970 | |
| 390 | 1971 class ResetClaimValuesClosure: public HeapRegionClosure { |
| 1972 public: | |
| 1973 bool doHeapRegion(HeapRegion* r) { | |
| 1974 r->set_claim_value(HeapRegion::InitialClaimValue); | |
| 1975 return false; | |
| 1976 } | |
| 1977 }; | |
| 1978 | |
| 1979 void | |
| 1980 G1CollectedHeap::reset_heap_region_claim_values() { | |
| 1981 ResetClaimValuesClosure blk; | |
| 1982 heap_region_iterate(&blk); | |
| 1983 } | |
| 1984 | |
| 355 | 1985 #ifdef ASSERT |
| 1986 // This checks whether all regions in the heap have the correct claim | |
| 1987 // value. I also piggy-backed on this a check to ensure that the | |
| 1988 // humongous_start_region() information on "continues humongous" | |
| 1989 // regions is correct. | |
| 1990 | |
| 1991 class CheckClaimValuesClosure : public HeapRegionClosure { | |
| 1992 private: | |
| 1993 jint _claim_value; | |
| 1994 size_t _failures; | |
| 1995 HeapRegion* _sh_region; | |
| 1996 public: | |
| 1997 CheckClaimValuesClosure(jint claim_value) : | |
| 1998 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
| 1999 bool doHeapRegion(HeapRegion* r) { | |
| 2000 if (r->claim_value() != _claim_value) { | |
| 2001 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
| 2002 "claim value = %d, should be %d", | |
| 2003 r->bottom(), r->end(), r->claim_value(), | |
| 2004 _claim_value); | |
| 2005 ++_failures; | |
| 2006 } | |
| 2007 if (!r->isHumongous()) { | |
| 2008 _sh_region = NULL; | |
| 2009 } else if (r->startsHumongous()) { | |
| 2010 _sh_region = r; | |
| 2011 } else if (r->continuesHumongous()) { | |
| 2012 if (r->humongous_start_region() != _sh_region) { | |
| 2013 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
| 2014 "HS = "PTR_FORMAT", should be "PTR_FORMAT, | |
| 2015 r->bottom(), r->end(), | |
| 2016 r->humongous_start_region(), | |
| 2017 _sh_region); | |
| 2018 ++_failures; | |
| 342 | 2019 } |
| 2020 } | |
| 355 | 2021 return false; |
| 2022 } | |
| 2023 size_t failures() { | |
| 2024 return _failures; | |
| 2025 } | |
| 2026 }; | |
| 2027 | |
| 2028 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
| 2029 CheckClaimValuesClosure cl(claim_value); | |
| 2030 heap_region_iterate(&cl); | |
| 2031 return cl.failures() == 0; | |
| 2032 } | |
| 2033 #endif // ASSERT | |
| 342 | 2034 |
| 2035 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { | |
| 2036 HeapRegion* r = g1_policy()->collection_set(); | |
| 2037 while (r != NULL) { | |
| 2038 HeapRegion* next = r->next_in_collection_set(); | |
| 2039 if (cl->doHeapRegion(r)) { | |
| 2040 cl->incomplete(); | |
| 2041 return; | |
| 2042 } | |
| 2043 r = next; | |
| 2044 } | |
| 2045 } | |
| 2046 | |
| 2047 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
| 2048 HeapRegionClosure *cl) { | |
| 2049 assert(r->in_collection_set(), | |
| 2050 "Start region must be a member of the collection set."); | |
| 2051 HeapRegion* cur = r; | |
| 2052 while (cur != NULL) { | |
| 2053 HeapRegion* next = cur->next_in_collection_set(); | |
| 2054 if (cl->doHeapRegion(cur) && false) { | |
| 2055 cl->incomplete(); | |
| 2056 return; | |
| 2057 } | |
| 2058 cur = next; | |
| 2059 } | |
| 2060 cur = g1_policy()->collection_set(); | |
| 2061 while (cur != r) { | |
| 2062 HeapRegion* next = cur->next_in_collection_set(); | |
| 2063 if (cl->doHeapRegion(cur) && false) { | |
| 2064 cl->incomplete(); | |
| 2065 return; | |
| 2066 } | |
| 2067 cur = next; | |
| 2068 } | |
| 2069 } | |
| 2070 | |
| 2071 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
| 2072 return _hrs->length() > 0 ? _hrs->at(0) : NULL; | |
| 2073 } | |
| 2074 | |
| 2075 | |
| 2076 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
| 2077 Space* res = heap_region_containing(addr); | |
| 2078 if (res == NULL) | |
| 2079 res = perm_gen()->space_containing(addr); | |
| 2080 return res; | |
| 2081 } | |
| 2082 | |
| 2083 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
| 2084 Space* sp = space_containing(addr); | |
| 2085 if (sp != NULL) { | |
| 2086 return sp->block_start(addr); | |
| 2087 } | |
| 2088 return NULL; | |
| 2089 } | |
| 2090 | |
| 2091 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
| 2092 Space* sp = space_containing(addr); | |
| 2093 assert(sp != NULL, "block_size of address outside of heap"); | |
| 2094 return sp->block_size(addr); | |
| 2095 } | |
| 2096 | |
| 2097 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
| 2098 Space* sp = space_containing(addr); | |
| 2099 return sp->block_is_obj(addr); | |
| 2100 } | |
| 2101 | |
| 2102 bool G1CollectedHeap::supports_tlab_allocation() const { | |
| 2103 return true; | |
| 2104 } | |
| 2105 | |
| 2106 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
| 2107 return HeapRegion::GrainBytes; | |
| 2108 } | |
| 2109 | |
| 2110 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
| 2111 // Return the remaining space in the cur alloc region, but not less than | |
| 2112 // the min TLAB size. | |
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2113 |
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2114 // Also, this value can be at most the humongous object threshold, |
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2115 // since we can't allow tlabs to grow big enough to accomodate |
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2116 // humongous objects. |
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2117 |
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2118 // We need to store the cur alloc region locally, since it might change |
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2119 // between when we test for NULL and when we use it later. |
| 342 | 2120 ContiguousSpace* cur_alloc_space = _cur_alloc_region; |
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2121 size_t max_tlab_size = _humongous_object_threshold_in_words * wordSize; |
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2122 |
| 342 | 2123 if (cur_alloc_space == NULL) { |
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2124 return max_tlab_size; |
| 342 | 2125 } else { |
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2126 return MIN2(MAX2(cur_alloc_space->free(), (size_t)MinTLABSize), |
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2127 max_tlab_size); |
| 342 | 2128 } |
| 2129 } | |
| 2130 | |
| 2131 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t size) { | |
| 2132 bool dummy; | |
| 2133 return G1CollectedHeap::mem_allocate(size, false, true, &dummy); | |
| 2134 } | |
| 2135 | |
| 2136 bool G1CollectedHeap::allocs_are_zero_filled() { | |
| 2137 return false; | |
| 2138 } | |
| 2139 | |
| 2140 size_t G1CollectedHeap::large_typearray_limit() { | |
| 2141 // FIXME | |
| 2142 return HeapRegion::GrainBytes/HeapWordSize; | |
| 2143 } | |
| 2144 | |
| 2145 size_t G1CollectedHeap::max_capacity() const { | |
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2146 return g1_reserved_obj_bytes(); |
| 342 | 2147 } |
| 2148 | |
| 2149 jlong G1CollectedHeap::millis_since_last_gc() { | |
| 2150 // assert(false, "NYI"); | |
| 2151 return 0; | |
| 2152 } | |
| 2153 | |
| 2154 | |
| 2155 void G1CollectedHeap::prepare_for_verify() { | |
| 2156 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
| 2157 ensure_parsability(false); | |
| 2158 } | |
| 2159 g1_rem_set()->prepare_for_verify(); | |
| 2160 } | |
| 2161 | |
| 2162 class VerifyLivenessOopClosure: public OopClosure { | |
| 2163 G1CollectedHeap* g1h; | |
| 2164 public: | |
| 2165 VerifyLivenessOopClosure(G1CollectedHeap* _g1h) { | |
| 2166 g1h = _g1h; | |
| 2167 } | |
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2168 void do_oop(narrowOop *p) { do_oop_work(p); } |
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2169 void do_oop( oop *p) { do_oop_work(p); } |
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2170 |
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2171 template <class T> void do_oop_work(T *p) { |
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2172 oop obj = oopDesc::load_decode_heap_oop(p); |
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2173 guarantee(obj == NULL || !g1h->is_obj_dead(obj), |
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2174 "Dead object referenced by a not dead object"); |
| 342 | 2175 } |
| 2176 }; | |
| 2177 | |
| 2178 class VerifyObjsInRegionClosure: public ObjectClosure { | |
| 811 | 2179 private: |
| 342 | 2180 G1CollectedHeap* _g1h; |
| 2181 size_t _live_bytes; | |
| 2182 HeapRegion *_hr; | |
| 811 | 2183 bool _use_prev_marking; |
| 342 | 2184 public: |
| 811 | 2185 // use_prev_marking == true -> use "prev" marking information, |
| 2186 // use_prev_marking == false -> use "next" marking information | |
| 2187 VerifyObjsInRegionClosure(HeapRegion *hr, bool use_prev_marking) | |
| 2188 : _live_bytes(0), _hr(hr), _use_prev_marking(use_prev_marking) { | |
| 342 | 2189 _g1h = G1CollectedHeap::heap(); |
| 2190 } | |
| 2191 void do_object(oop o) { | |
| 2192 VerifyLivenessOopClosure isLive(_g1h); | |
| 2193 assert(o != NULL, "Huh?"); | |
| 811 | 2194 if (!_g1h->is_obj_dead_cond(o, _use_prev_marking)) { |
| 342 | 2195 o->oop_iterate(&isLive); |
|
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2196 if (!_hr->obj_allocated_since_prev_marking(o)) { |
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2197 size_t obj_size = o->size(); // Make sure we don't overflow |
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2198 _live_bytes += (obj_size * HeapWordSize); |
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2199 } |
| 342 | 2200 } |
| 2201 } | |
| 2202 size_t live_bytes() { return _live_bytes; } | |
| 2203 }; | |
| 2204 | |
| 2205 class PrintObjsInRegionClosure : public ObjectClosure { | |
| 2206 HeapRegion *_hr; | |
| 2207 G1CollectedHeap *_g1; | |
| 2208 public: | |
| 2209 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
| 2210 _g1 = G1CollectedHeap::heap(); | |
| 2211 }; | |
| 2212 | |
| 2213 void do_object(oop o) { | |
| 2214 if (o != NULL) { | |
| 2215 HeapWord *start = (HeapWord *) o; | |
| 2216 size_t word_sz = o->size(); | |
| 2217 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
| 2218 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
| 2219 (void*) o, word_sz, | |
| 2220 _g1->isMarkedPrev(o), | |
| 2221 _g1->isMarkedNext(o), | |
| 2222 _hr->obj_allocated_since_prev_marking(o)); | |
| 2223 HeapWord *end = start + word_sz; | |
| 2224 HeapWord *cur; | |
| 2225 int *val; | |
| 2226 for (cur = start; cur < end; cur++) { | |
| 2227 val = (int *) cur; | |
| 2228 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
| 2229 } | |
| 2230 } | |
| 2231 } | |
| 2232 }; | |
| 2233 | |
| 2234 class VerifyRegionClosure: public HeapRegionClosure { | |
| 811 | 2235 private: |
| 342 | 2236 bool _allow_dirty; |
| 390 | 2237 bool _par; |
| 811 | 2238 bool _use_prev_marking; |
|
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2239 bool _failures; |
| 811 | 2240 public: |
| 2241 // use_prev_marking == true -> use "prev" marking information, | |
| 2242 // use_prev_marking == false -> use "next" marking information | |
| 2243 VerifyRegionClosure(bool allow_dirty, bool par, bool use_prev_marking) | |
|
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2244 : _allow_dirty(allow_dirty), |
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2245 _par(par), |
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2246 _use_prev_marking(use_prev_marking), |
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2247 _failures(false) {} |
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2248 |
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2249 bool failures() { |
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2250 return _failures; |
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2251 } |
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2252 |
| 342 | 2253 bool doHeapRegion(HeapRegion* r) { |
| 390 | 2254 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
| 2255 "Should be unclaimed at verify points."); | |
|
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2256 if (!r->continuesHumongous()) { |
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2257 bool failures = false; |
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2258 r->verify(_allow_dirty, _use_prev_marking, &failures); |
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2259 if (failures) { |
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2260 _failures = true; |
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2261 } else { |
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2262 VerifyObjsInRegionClosure not_dead_yet_cl(r, _use_prev_marking); |
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2263 r->object_iterate(¬_dead_yet_cl); |
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2264 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
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2265 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
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2266 "max_live_bytes "SIZE_FORMAT" " |
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2267 "< calculated "SIZE_FORMAT, |
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2268 r->bottom(), r->end(), |
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2269 r->max_live_bytes(), |
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2270 not_dead_yet_cl.live_bytes()); |
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2271 _failures = true; |
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2272 } |
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2273 } |
| 342 | 2274 } |
|
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2275 return false; // stop the region iteration if we hit a failure |
| 342 | 2276 } |
| 2277 }; | |
| 2278 | |
| 2279 class VerifyRootsClosure: public OopsInGenClosure { | |
| 2280 private: | |
| 2281 G1CollectedHeap* _g1h; | |
|
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2282 bool _use_prev_marking; |
| 342 | 2283 bool _failures; |
| 2284 public: | |
| 811 | 2285 // use_prev_marking == true -> use "prev" marking information, |
| 2286 // use_prev_marking == false -> use "next" marking information | |
| 2287 VerifyRootsClosure(bool use_prev_marking) : | |
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2288 _g1h(G1CollectedHeap::heap()), |
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2289 _use_prev_marking(use_prev_marking), |
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2290 _failures(false) { } |
| 342 | 2291 |
| 2292 bool failures() { return _failures; } | |
| 2293 | |
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2294 template <class T> void do_oop_nv(T* p) { |
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2295 T heap_oop = oopDesc::load_heap_oop(p); |
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2296 if (!oopDesc::is_null(heap_oop)) { |
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2297 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
| 811 | 2298 if (_g1h->is_obj_dead_cond(obj, _use_prev_marking)) { |
| 342 | 2299 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
|
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2300 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
| 342 | 2301 obj->print_on(gclog_or_tty); |
| 2302 _failures = true; | |
| 2303 } | |
| 2304 } | |
| 2305 } | |
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2306 |
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2307 void do_oop(oop* p) { do_oop_nv(p); } |
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2308 void do_oop(narrowOop* p) { do_oop_nv(p); } |
| 342 | 2309 }; |
| 2310 | |
| 390 | 2311 // This is the task used for parallel heap verification. |
| 2312 | |
| 2313 class G1ParVerifyTask: public AbstractGangTask { | |
| 2314 private: | |
| 2315 G1CollectedHeap* _g1h; | |
| 2316 bool _allow_dirty; | |
| 811 | 2317 bool _use_prev_marking; |
|
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2318 bool _failures; |
| 390 | 2319 |
| 2320 public: | |
| 811 | 2321 // use_prev_marking == true -> use "prev" marking information, |
| 2322 // use_prev_marking == false -> use "next" marking information | |
| 2323 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, | |
| 2324 bool use_prev_marking) : | |
| 390 | 2325 AbstractGangTask("Parallel verify task"), |
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2326 _g1h(g1h), |
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2327 _allow_dirty(allow_dirty), |
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2328 _use_prev_marking(use_prev_marking), |
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2329 _failures(false) { } |
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2330 |
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2331 bool failures() { |
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2332 return _failures; |
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2333 } |
| 390 | 2334 |
| 2335 void work(int worker_i) { | |
|
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2336 HandleMark hm; |
| 811 | 2337 VerifyRegionClosure blk(_allow_dirty, true, _use_prev_marking); |
| 390 | 2338 _g1h->heap_region_par_iterate_chunked(&blk, worker_i, |
| 2339 HeapRegion::ParVerifyClaimValue); | |
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2340 if (blk.failures()) { |
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2341 _failures = true; |
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2342 } |
| 390 | 2343 } |
| 2344 }; | |
| 2345 | |
| 342 | 2346 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
| 811 | 2347 verify(allow_dirty, silent, /* use_prev_marking */ true); |
| 2348 } | |
| 2349 | |
| 2350 void G1CollectedHeap::verify(bool allow_dirty, | |
| 2351 bool silent, | |
| 2352 bool use_prev_marking) { | |
| 342 | 2353 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
| 2354 if (!silent) { gclog_or_tty->print("roots "); } | |
| 811 | 2355 VerifyRootsClosure rootsCl(use_prev_marking); |
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2356 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
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2357 process_strong_roots(true, // activate StrongRootsScope |
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2358 false, |
| 342 | 2359 SharedHeap::SO_AllClasses, |
| 2360 &rootsCl, | |
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2361 &blobsCl, |
| 342 | 2362 &rootsCl); |
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2363 bool failures = rootsCl.failures(); |
| 342 | 2364 rem_set()->invalidate(perm_gen()->used_region(), false); |
| 2365 if (!silent) { gclog_or_tty->print("heapRegions "); } | |
| 390 | 2366 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
| 2367 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2368 "sanity check"); | |
| 2369 | |
| 811 | 2370 G1ParVerifyTask task(this, allow_dirty, use_prev_marking); |
| 390 | 2371 int n_workers = workers()->total_workers(); |
| 2372 set_par_threads(n_workers); | |
| 2373 workers()->run_task(&task); | |
| 2374 set_par_threads(0); | |
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2375 if (task.failures()) { |
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2376 failures = true; |
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2377 } |
| 390 | 2378 |
| 2379 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), | |
| 2380 "sanity check"); | |
| 2381 | |
| 2382 reset_heap_region_claim_values(); | |
| 2383 | |
| 2384 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2385 "sanity check"); | |
| 2386 } else { | |
| 811 | 2387 VerifyRegionClosure blk(allow_dirty, false, use_prev_marking); |
| 390 | 2388 _hrs->iterate(&blk); |
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2389 if (blk.failures()) { |
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2390 failures = true; |
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2391 } |
| 390 | 2392 } |
| 342 | 2393 if (!silent) gclog_or_tty->print("remset "); |
| 2394 rem_set()->verify(); | |
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2395 |
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2396 if (failures) { |
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2397 gclog_or_tty->print_cr("Heap:"); |
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2398 print_on(gclog_or_tty, true /* extended */); |
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2399 gclog_or_tty->print_cr(""); |
| 1044 | 2400 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
| 1388 | 2401 concurrent_mark()->print_reachable("at-verification-failure", |
| 2402 use_prev_marking, false /* all */); | |
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2403 } |
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2404 gclog_or_tty->flush(); |
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2405 } |
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2406 guarantee(!failures, "there should not have been any failures"); |
| 342 | 2407 } else { |
| 2408 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
| 2409 } | |
| 2410 } | |
| 2411 | |
| 2412 class PrintRegionClosure: public HeapRegionClosure { | |
| 2413 outputStream* _st; | |
| 2414 public: | |
| 2415 PrintRegionClosure(outputStream* st) : _st(st) {} | |
| 2416 bool doHeapRegion(HeapRegion* r) { | |
| 2417 r->print_on(_st); | |
| 2418 return false; | |
| 2419 } | |
| 2420 }; | |
| 2421 | |
|
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2422 void G1CollectedHeap::print() const { print_on(tty); } |
| 342 | 2423 |
| 2424 void G1CollectedHeap::print_on(outputStream* st) const { | |
|
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2425 print_on(st, PrintHeapAtGCExtended); |
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2426 } |
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2427 |
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2428 void G1CollectedHeap::print_on(outputStream* st, bool extended) const { |
|
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2429 st->print(" %-20s", "garbage-first heap"); |
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2430 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
|
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2431 capacity()/K, used_unlocked()/K); |
|
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2432 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
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2433 _g1_storage.low_boundary(), |
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2434 _g1_storage.high(), |
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2435 _g1_storage.high_boundary()); |
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2436 st->cr(); |
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2437 st->print(" region size " SIZE_FORMAT "K, ", |
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2438 HeapRegion::GrainBytes/K); |
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2439 size_t young_regions = _young_list->length(); |
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2440 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
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2441 young_regions, young_regions * HeapRegion::GrainBytes / K); |
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2442 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
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2443 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
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2444 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
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2445 st->cr(); |
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2446 perm()->as_gen()->print_on(st); |
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2447 if (extended) { |
|
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2448 st->cr(); |
|
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2449 print_on_extended(st); |
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2450 } |
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2451 } |
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2452 |
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2453 void G1CollectedHeap::print_on_extended(outputStream* st) const { |
| 342 | 2454 PrintRegionClosure blk(st); |
| 2455 _hrs->iterate(&blk); | |
| 2456 } | |
| 2457 | |
| 2458 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
| 2459 if (ParallelGCThreads > 0) { | |
| 1019 | 2460 workers()->print_worker_threads_on(st); |
| 2461 } | |
| 2462 | |
| 2463 _cmThread->print_on(st); | |
| 342 | 2464 st->cr(); |
| 1019 | 2465 |
| 2466 _cm->print_worker_threads_on(st); | |
| 2467 | |
| 2468 _cg1r->print_worker_threads_on(st); | |
| 2469 | |
| 342 | 2470 _czft->print_on(st); |
| 2471 st->cr(); | |
| 2472 } | |
| 2473 | |
| 2474 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
| 2475 if (ParallelGCThreads > 0) { | |
| 2476 workers()->threads_do(tc); | |
| 2477 } | |
| 2478 tc->do_thread(_cmThread); | |
| 794 | 2479 _cg1r->threads_do(tc); |
| 342 | 2480 tc->do_thread(_czft); |
| 2481 } | |
| 2482 | |
| 2483 void G1CollectedHeap::print_tracing_info() const { | |
| 2484 // We'll overload this to mean "trace GC pause statistics." | |
| 2485 if (TraceGen0Time || TraceGen1Time) { | |
| 2486 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
| 2487 // to that. | |
| 2488 g1_policy()->print_tracing_info(); | |
| 2489 } | |
| 751 | 2490 if (G1SummarizeRSetStats) { |
| 342 | 2491 g1_rem_set()->print_summary_info(); |
| 2492 } | |
| 1282 | 2493 if (G1SummarizeConcMark) { |
| 342 | 2494 concurrent_mark()->print_summary_info(); |
| 2495 } | |
| 751 | 2496 if (G1SummarizeZFStats) { |
| 342 | 2497 ConcurrentZFThread::print_summary_info(); |
| 2498 } | |
| 2499 g1_policy()->print_yg_surv_rate_info(); | |
| 2500 | |
| 2501 SpecializationStats::print(); | |
| 2502 } | |
| 2503 | |
| 2504 | |
| 2505 int G1CollectedHeap::addr_to_arena_id(void* addr) const { | |
| 2506 HeapRegion* hr = heap_region_containing(addr); | |
| 2507 if (hr == NULL) { | |
| 2508 return 0; | |
| 2509 } else { | |
| 2510 return 1; | |
| 2511 } | |
| 2512 } | |
| 2513 | |
| 2514 G1CollectedHeap* G1CollectedHeap::heap() { | |
| 2515 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
| 2516 "not a garbage-first heap"); | |
| 2517 return _g1h; | |
| 2518 } | |
| 2519 | |
| 2520 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
|
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2521 // always_do_update_barrier = false; |
| 342 | 2522 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
| 2523 // Call allocation profiler | |
| 2524 AllocationProfiler::iterate_since_last_gc(); | |
| 2525 // Fill TLAB's and such | |
| 2526 ensure_parsability(true); | |
| 2527 } | |
| 2528 | |
| 2529 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
| 2530 // FIXME: what is this about? | |
| 2531 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
| 2532 // is set. | |
| 2533 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
| 2534 "derived pointer present")); | |
|
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2535 // always_do_update_barrier = true; |
| 342 | 2536 } |
| 2537 | |
| 2538 void G1CollectedHeap::do_collection_pause() { | |
| 2539 // Read the GC count while holding the Heap_lock | |
| 2540 // we need to do this _before_ wait_for_cleanup_complete(), to | |
| 2541 // ensure that we do not give up the heap lock and potentially | |
| 2542 // pick up the wrong count | |
| 2543 int gc_count_before = SharedHeap::heap()->total_collections(); | |
| 2544 | |
| 2545 // Don't want to do a GC pause while cleanup is being completed! | |
| 2546 wait_for_cleanup_complete(); | |
| 2547 | |
| 2548 g1_policy()->record_stop_world_start(); | |
| 2549 { | |
| 2550 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
| 2551 VM_G1IncCollectionPause op(gc_count_before); | |
| 2552 VMThread::execute(&op); | |
| 2553 } | |
| 2554 } | |
| 2555 | |
| 2556 void | |
| 2557 G1CollectedHeap::doConcurrentMark() { | |
|
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2558 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
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2559 if (!_cmThread->in_progress()) { |
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2560 _cmThread->set_started(); |
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2561 CGC_lock->notify(); |
| 342 | 2562 } |
| 2563 } | |
| 2564 | |
| 2565 class VerifyMarkedObjsClosure: public ObjectClosure { | |
| 2566 G1CollectedHeap* _g1h; | |
| 2567 public: | |
| 2568 VerifyMarkedObjsClosure(G1CollectedHeap* g1h) : _g1h(g1h) {} | |
| 2569 void do_object(oop obj) { | |
| 2570 assert(obj->mark()->is_marked() ? !_g1h->is_obj_dead(obj) : true, | |
| 2571 "markandsweep mark should agree with concurrent deadness"); | |
| 2572 } | |
| 2573 }; | |
| 2574 | |
| 2575 void | |
| 2576 G1CollectedHeap::checkConcurrentMark() { | |
| 2577 VerifyMarkedObjsClosure verifycl(this); | |
| 2578 // MutexLockerEx x(getMarkBitMapLock(), | |
| 2579 // Mutex::_no_safepoint_check_flag); | |
| 678 | 2580 object_iterate(&verifycl, false); |
| 342 | 2581 } |
| 2582 | |
| 2583 void G1CollectedHeap::do_sync_mark() { | |
| 2584 _cm->checkpointRootsInitial(); | |
| 2585 _cm->markFromRoots(); | |
| 2586 _cm->checkpointRootsFinal(false); | |
| 2587 } | |
| 2588 | |
| 2589 // <NEW PREDICTION> | |
| 2590 | |
| 2591 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
| 2592 bool young) { | |
| 2593 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
| 2594 } | |
| 2595 | |
| 2596 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
| 2597 predicted_time_ms) { | |
| 2598 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
| 2599 } | |
| 2600 | |
| 2601 size_t G1CollectedHeap::pending_card_num() { | |
| 2602 size_t extra_cards = 0; | |
| 2603 JavaThread *curr = Threads::first(); | |
| 2604 while (curr != NULL) { | |
| 2605 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
| 2606 extra_cards += dcq.size(); | |
| 2607 curr = curr->next(); | |
| 2608 } | |
| 2609 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 2610 size_t buffer_size = dcqs.buffer_size(); | |
| 2611 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 2612 return buffer_size * buffer_num + extra_cards; | |
| 2613 } | |
| 2614 | |
| 2615 size_t G1CollectedHeap::max_pending_card_num() { | |
| 2616 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 2617 size_t buffer_size = dcqs.buffer_size(); | |
| 2618 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 2619 int thread_num = Threads::number_of_threads(); | |
| 2620 return (buffer_num + thread_num) * buffer_size; | |
| 2621 } | |
| 2622 | |
| 2623 size_t G1CollectedHeap::cards_scanned() { | |
| 2624 HRInto_G1RemSet* g1_rset = (HRInto_G1RemSet*) g1_rem_set(); | |
| 2625 return g1_rset->cardsScanned(); | |
| 2626 } | |
| 2627 | |
| 2628 void | |
| 2629 G1CollectedHeap::setup_surviving_young_words() { | |
| 2630 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
| 2631 size_t array_length = g1_policy()->young_cset_length(); | |
| 2632 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); | |
| 2633 if (_surviving_young_words == NULL) { | |
| 2634 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
| 2635 "Not enough space for young surv words summary."); | |
| 2636 } | |
| 2637 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
|
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2638 #ifdef ASSERT |
| 342 | 2639 for (size_t i = 0; i < array_length; ++i) { |
|
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2640 assert( _surviving_young_words[i] == 0, "memset above" ); |
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2641 } |
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2642 #endif // !ASSERT |
| 342 | 2643 } |
| 2644 | |
| 2645 void | |
| 2646 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
| 2647 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 2648 size_t array_length = g1_policy()->young_cset_length(); | |
| 2649 for (size_t i = 0; i < array_length; ++i) | |
| 2650 _surviving_young_words[i] += surv_young_words[i]; | |
| 2651 } | |
| 2652 | |
| 2653 void | |
| 2654 G1CollectedHeap::cleanup_surviving_young_words() { | |
| 2655 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
| 2656 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
| 2657 _surviving_young_words = NULL; | |
| 2658 } | |
| 2659 | |
| 2660 // </NEW PREDICTION> | |
| 2661 | |
|
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2662 struct PrepareForRSScanningClosure : public HeapRegionClosure { |
|
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2663 bool doHeapRegion(HeapRegion *r) { |
|
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2664 r->rem_set()->set_iter_claimed(0); |
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2665 return false; |
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2666 } |
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2667 }; |
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2668 |
| 342 | 2669 void |
| 677 | 2670 G1CollectedHeap::do_collection_pause_at_safepoint() { |
|
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2671 if (GC_locker::check_active_before_gc()) { |
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2672 return; // GC is disabled (e.g. JNI GetXXXCritical operation) |
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2673 } |
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2674 |
|
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2675 if (PrintHeapAtGC) { |
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2676 Universe::print_heap_before_gc(); |
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2677 } |
|
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2678 |
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2679 { |
|
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2680 ResourceMark rm; |
|
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2681 |
|
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2682 // This call will decide whether this pause is an initial-mark |
|
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2683 // pause. If it is, during_initial_mark_pause() will return true |
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2684 // for the duration of this pause. |
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2685 g1_policy()->decide_on_conc_mark_initiation(); |
|
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2686 |
|
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2687 char verbose_str[128]; |
|
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2688 sprintf(verbose_str, "GC pause "); |
|
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2689 if (g1_policy()->in_young_gc_mode()) { |
|
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2690 if (g1_policy()->full_young_gcs()) |
|
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2691 strcat(verbose_str, "(young)"); |
|
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|
2692 else |
|
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|
2693 strcat(verbose_str, "(partial)"); |
|
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2694 } |
|
1359
23b1b27ac76c
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|
2695 if (g1_policy()->during_initial_mark_pause()) |
|
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|
2696 strcat(verbose_str, " (initial-mark)"); |
|
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2697 |
|
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|
2698 // if PrintGCDetails is on, we'll print long statistics information |
|
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2699 // in the collector policy code, so let's not print this as the output |
|
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2700 // is messy if we do. |
|
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|
2701 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
|
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|
2702 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
|
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|
2703 TraceTime t(verbose_str, PrintGC && !PrintGCDetails, true, gclog_or_tty); |
|
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2704 |
|
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|
2705 TraceMemoryManagerStats tms(false /* fullGC */); |
|
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2706 |
|
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|
2707 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
|
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2708 assert(Thread::current() == VMThread::vm_thread(), "should be in vm thread"); |
|
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2709 guarantee(!is_gc_active(), "collection is not reentrant"); |
|
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|
2710 assert(regions_accounted_for(), "Region leakage!"); |
|
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2711 |
|
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|
2712 increment_gc_time_stamp(); |
|
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2713 |
|
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|
2714 if (g1_policy()->in_young_gc_mode()) { |
|
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|
2715 assert(check_young_list_well_formed(), |
|
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|
2716 "young list should be well formed"); |
|
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|
2717 } |
|
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2718 |
|
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|
2719 bool abandoned = false; |
|
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2720 { // Call to jvmpi::post_class_unload_events must occur outside of active GC |
|
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|
2721 IsGCActiveMark x; |
|
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|
2722 |
|
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|
2723 gc_prologue(false); |
|
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|
2724 increment_total_collections(false /* full gc */); |
| 342 | 2725 |
| 2726 #if G1_REM_SET_LOGGING | |
|
838
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|
2727 gclog_or_tty->print_cr("\nJust chose CS, heap:"); |
|
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|
2728 print(); |
| 342 | 2729 #endif |
| 2730 | |
|
838
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|
2731 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
|
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|
2732 HandleMark hm; // Discard invalid handles created during verification |
|
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|
2733 prepare_for_verify(); |
|
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|
2734 gclog_or_tty->print(" VerifyBeforeGC:"); |
|
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|
2735 Universe::verify(false); |
|
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|
2736 } |
|
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|
2737 |
|
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|
2738 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
|
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|
2739 |
|
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|
2740 // We want to turn off ref discovery, if necessary, and turn it back on |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
2741 // on again later if we do. XXX Dubious: why is discovery disabled? |
|
838
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|
2742 bool was_enabled = ref_processor()->discovery_enabled(); |
|
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|
2743 if (was_enabled) ref_processor()->disable_discovery(); |
|
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|
2744 |
|
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|
2745 // Forget the current alloc region (we might even choose it to be part |
|
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|
2746 // of the collection set!). |
|
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|
2747 abandon_cur_alloc_region(); |
|
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|
2748 |
|
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|
2749 // The elapsed time induced by the start time below deliberately elides |
|
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|
2750 // the possible verification above. |
|
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|
2751 double start_time_sec = os::elapsedTime(); |
|
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|
2752 size_t start_used_bytes = used(); |
|
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|
2753 |
|
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|
2754 g1_policy()->record_collection_pause_start(start_time_sec, |
|
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|
2755 start_used_bytes); |
|
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|
2756 |
|
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|
2757 guarantee(_in_cset_fast_test == NULL, "invariant"); |
|
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|
2758 guarantee(_in_cset_fast_test_base == NULL, "invariant"); |
|
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|
2759 _in_cset_fast_test_length = max_regions(); |
|
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|
2760 _in_cset_fast_test_base = |
| 526 | 2761 NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); |
|
838
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|
2762 memset(_in_cset_fast_test_base, false, |
| 526 | 2763 _in_cset_fast_test_length * sizeof(bool)); |
|
838
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|
2764 // We're biasing _in_cset_fast_test to avoid subtracting the |
|
0316eac49d5a
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|
2765 // beginning of the heap every time we want to index; basically |
|
0316eac49d5a
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|
2766 // it's the same with what we do with the card table. |
|
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|
2767 _in_cset_fast_test = _in_cset_fast_test_base - |
| 526 | 2768 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
| 2769 | |
| 342 | 2770 #if SCAN_ONLY_VERBOSE |
|
838
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|
2771 _young_list->print(); |
| 342 | 2772 #endif // SCAN_ONLY_VERBOSE |
| 2773 | |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2774 if (g1_policy()->during_initial_mark_pause()) { |
|
838
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|
2775 concurrent_mark()->checkpointRootsInitialPre(); |
|
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|
2776 } |
|
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|
2777 save_marks(); |
|
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|
2778 |
|
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|
2779 // We must do this before any possible evacuation that should propagate |
|
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|
2780 // marks. |
|
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|
2781 if (mark_in_progress()) { |
|
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|
2782 double start_time_sec = os::elapsedTime(); |
|
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|
2783 |
|
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|
2784 _cm->drainAllSATBBuffers(); |
|
0316eac49d5a
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|
2785 double finish_mark_ms = (os::elapsedTime() - start_time_sec) * 1000.0; |
|
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|
2786 g1_policy()->record_satb_drain_time(finish_mark_ms); |
|
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|
2787 } |
|
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|
2788 // Record the number of elements currently on the mark stack, so we |
|
0316eac49d5a
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|
2789 // only iterate over these. (Since evacuation may add to the mark |
|
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|
2790 // stack, doing more exposes race conditions.) If no mark is in |
|
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|
2791 // progress, this will be zero. |
|
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|
2792 _cm->set_oops_do_bound(); |
|
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|
2793 |
|
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|
2794 assert(regions_accounted_for(), "Region leakage."); |
|
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|
2795 |
|
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|
2796 if (mark_in_progress()) |
|
0316eac49d5a
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|
2797 concurrent_mark()->newCSet(); |
|
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|
2798 |
|
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|
2799 // Now choose the CS. |
|
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|
2800 g1_policy()->choose_collection_set(); |
|
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|
2801 |
|
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|
2802 // We may abandon a pause if we find no region that will fit in the MMU |
|
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|
2803 // pause. |
|
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|
2804 bool abandoned = (g1_policy()->collection_set() == NULL); |
|
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|
2805 |
|
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|
2806 // Nothing to do if we were unable to choose a collection set. |
|
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|
2807 if (!abandoned) { |
| 342 | 2808 #if G1_REM_SET_LOGGING |
|
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|
2809 gclog_or_tty->print_cr("\nAfter pause, heap:"); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2810 print(); |
| 342 | 2811 #endif |
|
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
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|
2812 PrepareForRSScanningClosure prepare_for_rs_scan; |
|
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
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1245
diff
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|
2813 collection_set_iterate(&prepare_for_rs_scan); |
| 342 | 2814 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2815 setup_surviving_young_words(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
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diff
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|
2816 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
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diff
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|
2817 // Set up the gc allocation regions. |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
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|
2818 get_gc_alloc_regions(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
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diff
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|
2819 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
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diff
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|
2820 // Actually do the work... |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
2821 evacuate_collection_set(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
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|
2822 free_collection_set(g1_policy()->collection_set()); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
changeset
|
2823 g1_policy()->clear_collection_set(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
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diff
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|
2824 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2825 FREE_C_HEAP_ARRAY(bool, _in_cset_fast_test_base); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
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|
2826 // this is more for peace of mind; we're nulling them here and |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2827 // we're expecting them to be null at the beginning of the next GC |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2828 _in_cset_fast_test = NULL; |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
2829 _in_cset_fast_test_base = NULL; |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
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diff
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|
2830 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
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diff
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|
2831 cleanup_surviving_young_words(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
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diff
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|
2832 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
2833 if (g1_policy()->in_young_gc_mode()) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
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|
2834 _young_list->reset_sampled_info(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2835 assert(check_young_list_empty(true), |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
2836 "young list should be empty"); |
| 342 | 2837 |
| 2838 #if SCAN_ONLY_VERBOSE | |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
2839 _young_list->print(); |
| 342 | 2840 #endif // SCAN_ONLY_VERBOSE |
| 2841 | |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
2842 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
changeset
|
2843 _young_list->first_survivor_region(), |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
changeset
|
2844 _young_list->last_survivor_region()); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
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|
2845 _young_list->reset_auxilary_lists(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
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diff
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|
2846 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2847 } else { |
|
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2848 if (_in_cset_fast_test != NULL) { |
|
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2849 assert(_in_cset_fast_test_base != NULL, "Since _in_cset_fast_test isn't"); |
|
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2850 FREE_C_HEAP_ARRAY(bool, _in_cset_fast_test_base); |
|
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2851 // this is more for peace of mind; we're nulling them here and |
|
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2852 // we're expecting them to be null at the beginning of the next GC |
|
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2853 _in_cset_fast_test = NULL; |
|
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2854 _in_cset_fast_test_base = NULL; |
|
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2855 } |
|
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2856 // This looks confusing, because the DPT should really be empty |
|
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2857 // at this point -- since we have not done any collection work, |
|
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2858 // there should not be any derived pointers in the table to update; |
|
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2859 // however, there is some additional state in the DPT which is |
|
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2860 // reset at the end of the (null) "gc" here via the following call. |
|
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2861 // A better approach might be to split off that state resetting work |
|
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2862 // into a separate method that asserts that the DPT is empty and call |
|
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2863 // that here. That is deferred for now. |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2864 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
| 342 | 2865 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2866 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2867 if (evacuation_failed()) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2868 _summary_bytes_used = recalculate_used(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2869 } else { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2870 // The "used" of the the collection set have already been subtracted |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2871 // when they were freed. Add in the bytes evacuated. |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2872 _summary_bytes_used += g1_policy()->bytes_in_to_space(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2873 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2874 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2875 if (g1_policy()->in_young_gc_mode() && |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
2876 g1_policy()->during_initial_mark_pause()) { |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2877 concurrent_mark()->checkpointRootsInitialPost(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2878 set_marking_started(); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2879 // CAUTION: after the doConcurrentMark() call below, |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2880 // the concurrent marking thread(s) could be running |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2881 // concurrently with us. Make sure that anything after |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2882 // this point does not assume that we are the only GC thread |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2883 // running. Note: of course, the actual marking work will |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2884 // not start until the safepoint itself is released in |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2885 // ConcurrentGCThread::safepoint_desynchronize(). |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2886 doConcurrentMark(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2887 } |
| 342 | 2888 |
| 2889 #if SCAN_ONLY_VERBOSE | |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2890 _young_list->print(); |
| 342 | 2891 #endif // SCAN_ONLY_VERBOSE |
| 2892 | |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2893 double end_time_sec = os::elapsedTime(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2894 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2895 g1_policy()->record_pause_time_ms(pause_time_ms); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2896 g1_policy()->record_collection_pause_end(abandoned); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2897 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2898 assert(regions_accounted_for(), "Region leakage."); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2899 |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
2900 MemoryService::track_memory_usage(); |
|
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
2901 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2902 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
2903 HandleMark hm; // Discard invalid handles created during verification |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2904 gclog_or_tty->print(" VerifyAfterGC:"); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
2905 prepare_for_verify(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2906 Universe::verify(false); |
| 342 | 2907 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2908 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2909 if (was_enabled) ref_processor()->enable_discovery(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2910 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2911 { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2912 size_t expand_bytes = g1_policy()->expansion_amount(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2913 if (expand_bytes > 0) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2914 size_t bytes_before = capacity(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2915 expand(expand_bytes); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2916 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2917 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2918 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2919 if (mark_in_progress()) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
2920 concurrent_mark()->update_g1_committed(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
2921 } |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
2922 |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
2923 #ifdef TRACESPINNING |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2924 ParallelTaskTerminator::print_termination_counts(); |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
2925 #endif |
| 342 | 2926 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
2927 gc_epilogue(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2928 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2929 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2930 assert(verify_region_lists(), "Bad region lists."); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2931 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2932 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2933 gclog_or_tty->print_cr("Stopping after GC #%d", ExitAfterGCNum); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2934 print_tracing_info(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2935 vm_exit(-1); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2936 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2937 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2938 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2939 if (PrintHeapAtGC) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2940 Universe::print_heap_after_gc(); |
| 342 | 2941 } |
|
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
2942 if (G1SummarizeRSetStats && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
2943 (G1SummarizeRSetStatsPeriod > 0) && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
2944 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
2945 g1_rem_set()->print_summary_info(); |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
2946 } |
| 342 | 2947 } |
| 2948 | |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
2949 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
2950 { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
2951 size_t gclab_word_size; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
2952 switch (purpose) { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
2953 case GCAllocForSurvived: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
2954 gclab_word_size = YoungPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
2955 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
2956 case GCAllocForTenured: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
2957 gclab_word_size = OldPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
2958 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
2959 default: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
2960 assert(false, "unknown GCAllocPurpose"); |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
2961 gclab_word_size = OldPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
2962 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
2963 } |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
2964 return gclab_word_size; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
2965 } |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
2966 |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
2967 |
| 342 | 2968 void G1CollectedHeap::set_gc_alloc_region(int purpose, HeapRegion* r) { |
| 2969 assert(purpose >= 0 && purpose < GCAllocPurposeCount, "invalid purpose"); | |
| 636 | 2970 // make sure we don't call set_gc_alloc_region() multiple times on |
| 2971 // the same region | |
| 2972 assert(r == NULL || !r->is_gc_alloc_region(), | |
| 2973 "shouldn't already be a GC alloc region"); | |
|
1360
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
2974 assert(r == NULL || !r->isHumongous(), |
|
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
2975 "humongous regions shouldn't be used as GC alloc regions"); |
|
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
2976 |
| 342 | 2977 HeapWord* original_top = NULL; |
| 2978 if (r != NULL) | |
| 2979 original_top = r->top(); | |
| 2980 | |
| 2981 // We will want to record the used space in r as being there before gc. | |
| 2982 // One we install it as a GC alloc region it's eligible for allocation. | |
| 2983 // So record it now and use it later. | |
| 2984 size_t r_used = 0; | |
| 2985 if (r != NULL) { | |
| 2986 r_used = r->used(); | |
| 2987 | |
| 2988 if (ParallelGCThreads > 0) { | |
| 2989 // need to take the lock to guard against two threads calling | |
| 2990 // get_gc_alloc_region concurrently (very unlikely but...) | |
| 2991 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 2992 r->save_marks(); | |
| 2993 } | |
| 2994 } | |
| 2995 HeapRegion* old_alloc_region = _gc_alloc_regions[purpose]; | |
| 2996 _gc_alloc_regions[purpose] = r; | |
| 2997 if (old_alloc_region != NULL) { | |
| 2998 // Replace aliases too. | |
| 2999 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 3000 if (_gc_alloc_regions[ap] == old_alloc_region) { | |
| 3001 _gc_alloc_regions[ap] = r; | |
| 3002 } | |
| 3003 } | |
| 3004 } | |
| 3005 if (r != NULL) { | |
| 3006 push_gc_alloc_region(r); | |
| 3007 if (mark_in_progress() && original_top != r->next_top_at_mark_start()) { | |
| 3008 // We are using a region as a GC alloc region after it has been used | |
| 3009 // as a mutator allocation region during the current marking cycle. | |
| 3010 // The mutator-allocated objects are currently implicitly marked, but | |
| 3011 // when we move hr->next_top_at_mark_start() forward at the the end | |
| 3012 // of the GC pause, they won't be. We therefore mark all objects in | |
| 3013 // the "gap". We do this object-by-object, since marking densely | |
| 3014 // does not currently work right with marking bitmap iteration. This | |
| 3015 // means we rely on TLAB filling at the start of pauses, and no | |
| 3016 // "resuscitation" of filled TLAB's. If we want to do this, we need | |
| 3017 // to fix the marking bitmap iteration. | |
| 3018 HeapWord* curhw = r->next_top_at_mark_start(); | |
| 3019 HeapWord* t = original_top; | |
| 3020 | |
| 3021 while (curhw < t) { | |
| 3022 oop cur = (oop)curhw; | |
| 3023 // We'll assume parallel for generality. This is rare code. | |
| 3024 concurrent_mark()->markAndGrayObjectIfNecessary(cur); // can't we just mark them? | |
| 3025 curhw = curhw + cur->size(); | |
| 3026 } | |
| 3027 assert(curhw == t, "Should have parsed correctly."); | |
| 3028 } | |
| 3029 if (G1PolicyVerbose > 1) { | |
| 3030 gclog_or_tty->print("New alloc region ["PTR_FORMAT", "PTR_FORMAT", " PTR_FORMAT") " | |
| 3031 "for survivors:", r->bottom(), original_top, r->end()); | |
| 3032 r->print(); | |
| 3033 } | |
| 3034 g1_policy()->record_before_bytes(r_used); | |
| 3035 } | |
| 3036 } | |
| 3037 | |
| 3038 void G1CollectedHeap::push_gc_alloc_region(HeapRegion* hr) { | |
| 3039 assert(Thread::current()->is_VM_thread() || | |
| 3040 par_alloc_during_gc_lock()->owned_by_self(), "Precondition"); | |
| 3041 assert(!hr->is_gc_alloc_region() && !hr->in_collection_set(), | |
| 3042 "Precondition."); | |
| 3043 hr->set_is_gc_alloc_region(true); | |
| 3044 hr->set_next_gc_alloc_region(_gc_alloc_region_list); | |
| 3045 _gc_alloc_region_list = hr; | |
| 3046 } | |
| 3047 | |
| 3048 #ifdef G1_DEBUG | |
| 3049 class FindGCAllocRegion: public HeapRegionClosure { | |
| 3050 public: | |
| 3051 bool doHeapRegion(HeapRegion* r) { | |
| 3052 if (r->is_gc_alloc_region()) { | |
| 3053 gclog_or_tty->print_cr("Region %d ["PTR_FORMAT"...] is still a gc_alloc_region.", | |
| 3054 r->hrs_index(), r->bottom()); | |
| 3055 } | |
| 3056 return false; | |
| 3057 } | |
| 3058 }; | |
| 3059 #endif // G1_DEBUG | |
| 3060 | |
| 3061 void G1CollectedHeap::forget_alloc_region_list() { | |
| 3062 assert(Thread::current()->is_VM_thread(), "Precondition"); | |
| 3063 while (_gc_alloc_region_list != NULL) { | |
| 3064 HeapRegion* r = _gc_alloc_region_list; | |
| 3065 assert(r->is_gc_alloc_region(), "Invariant."); | |
|
637
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3066 // We need HeapRegion::oops_on_card_seq_iterate_careful() to work on |
|
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3067 // newly allocated data in order to be able to apply deferred updates |
|
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3068 // before the GC is done for verification purposes (i.e to allow |
|
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3069 // G1HRRSFlushLogBuffersOnVerify). It's safe thing to do after the |
|
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3070 // collection. |
|
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3071 r->ContiguousSpace::set_saved_mark(); |
| 342 | 3072 _gc_alloc_region_list = r->next_gc_alloc_region(); |
| 3073 r->set_next_gc_alloc_region(NULL); | |
| 3074 r->set_is_gc_alloc_region(false); | |
| 545 | 3075 if (r->is_survivor()) { |
| 3076 if (r->is_empty()) { | |
| 3077 r->set_not_young(); | |
| 3078 } else { | |
| 3079 _young_list->add_survivor_region(r); | |
| 3080 } | |
| 3081 } | |
| 342 | 3082 if (r->is_empty()) { |
| 3083 ++_free_regions; | |
| 3084 } | |
| 3085 } | |
| 3086 #ifdef G1_DEBUG | |
| 3087 FindGCAllocRegion fa; | |
| 3088 heap_region_iterate(&fa); | |
| 3089 #endif // G1_DEBUG | |
| 3090 } | |
| 3091 | |
| 3092 | |
| 3093 bool G1CollectedHeap::check_gc_alloc_regions() { | |
| 3094 // TODO: allocation regions check | |
| 3095 return true; | |
| 3096 } | |
| 3097 | |
| 3098 void G1CollectedHeap::get_gc_alloc_regions() { | |
| 636 | 3099 // First, let's check that the GC alloc region list is empty (it should) |
| 3100 assert(_gc_alloc_region_list == NULL, "invariant"); | |
| 3101 | |
| 342 | 3102 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
| 636 | 3103 assert(_gc_alloc_regions[ap] == NULL, "invariant"); |
|
861
45d97a99715b
6862661: G1: _gc_alloc_region_counts is not updated properly after 6604422
apetrusenko
parents:
846
diff
changeset
|
3104 assert(_gc_alloc_region_counts[ap] == 0, "invariant"); |
| 636 | 3105 |
| 342 | 3106 // Create new GC alloc regions. |
| 636 | 3107 HeapRegion* alloc_region = _retained_gc_alloc_regions[ap]; |
| 3108 _retained_gc_alloc_regions[ap] = NULL; | |
| 3109 | |
| 3110 if (alloc_region != NULL) { | |
| 3111 assert(_retain_gc_alloc_region[ap], "only way to retain a GC region"); | |
| 3112 | |
| 3113 // let's make sure that the GC alloc region is not tagged as such | |
| 3114 // outside a GC operation | |
| 3115 assert(!alloc_region->is_gc_alloc_region(), "sanity"); | |
| 3116 | |
| 3117 if (alloc_region->in_collection_set() || | |
| 3118 alloc_region->top() == alloc_region->end() || | |
|
1360
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3119 alloc_region->top() == alloc_region->bottom() || |
|
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3120 alloc_region->isHumongous()) { |
|
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3121 // we will discard the current GC alloc region if |
|
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3122 // * it's in the collection set (it can happen!), |
|
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3123 // * it's already full (no point in using it), |
|
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3124 // * it's empty (this means that it was emptied during |
|
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3125 // a cleanup and it should be on the free list now), or |
|
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3126 // * it's humongous (this means that it was emptied |
|
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3127 // during a cleanup and was added to the free list, but |
|
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3128 // has been subseqently used to allocate a humongous |
|
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3129 // object that may be less than the region size). |
| 636 | 3130 |
| 3131 alloc_region = NULL; | |
| 3132 } | |
| 3133 } | |
| 3134 | |
| 3135 if (alloc_region == NULL) { | |
| 3136 // we will get a new GC alloc region | |
| 342 | 3137 alloc_region = newAllocRegionWithExpansion(ap, 0); |
|
861
45d97a99715b
6862661: G1: _gc_alloc_region_counts is not updated properly after 6604422
apetrusenko
parents:
846
diff
changeset
|
3138 } else { |
|
45d97a99715b
6862661: G1: _gc_alloc_region_counts is not updated properly after 6604422
apetrusenko
parents:
846
diff
changeset
|
3139 // the region was retained from the last collection |
|
45d97a99715b
6862661: G1: _gc_alloc_region_counts is not updated properly after 6604422
apetrusenko
parents:
846
diff
changeset
|
3140 ++_gc_alloc_region_counts[ap]; |
| 1388 | 3141 if (G1PrintHeapRegions) { |
| 3142 gclog_or_tty->print_cr("new alloc region %d:["PTR_FORMAT", "PTR_FORMAT"], " | |
| 3143 "top "PTR_FORMAT, | |
| 3144 alloc_region->hrs_index(), alloc_region->bottom(), alloc_region->end(), alloc_region->top()); | |
| 3145 } | |
| 342 | 3146 } |
| 636 | 3147 |
| 342 | 3148 if (alloc_region != NULL) { |
| 636 | 3149 assert(_gc_alloc_regions[ap] == NULL, "pre-condition"); |
| 342 | 3150 set_gc_alloc_region(ap, alloc_region); |
| 3151 } | |
| 636 | 3152 |
| 3153 assert(_gc_alloc_regions[ap] == NULL || | |
| 3154 _gc_alloc_regions[ap]->is_gc_alloc_region(), | |
| 3155 "the GC alloc region should be tagged as such"); | |
| 3156 assert(_gc_alloc_regions[ap] == NULL || | |
| 3157 _gc_alloc_regions[ap] == _gc_alloc_region_list, | |
| 3158 "the GC alloc region should be the same as the GC alloc list head"); | |
| 342 | 3159 } |
| 3160 // Set alternative regions for allocation purposes that have reached | |
| 636 | 3161 // their limit. |
| 342 | 3162 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
| 3163 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(ap); | |
| 3164 if (_gc_alloc_regions[ap] == NULL && alt_purpose != ap) { | |
| 3165 _gc_alloc_regions[ap] = _gc_alloc_regions[alt_purpose]; | |
| 3166 } | |
| 3167 } | |
| 3168 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
| 3169 } | |
| 3170 | |
| 636 | 3171 void G1CollectedHeap::release_gc_alloc_regions(bool totally) { |
| 342 | 3172 // We keep a separate list of all regions that have been alloc regions in |
| 636 | 3173 // the current collection pause. Forget that now. This method will |
| 3174 // untag the GC alloc regions and tear down the GC alloc region | |
| 3175 // list. It's desirable that no regions are tagged as GC alloc | |
| 3176 // outside GCs. | |
| 342 | 3177 forget_alloc_region_list(); |
| 3178 | |
| 3179 // The current alloc regions contain objs that have survived | |
| 3180 // collection. Make them no longer GC alloc regions. | |
| 3181 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 3182 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 636 | 3183 _retained_gc_alloc_regions[ap] = NULL; |
|
861
45d97a99715b
6862661: G1: _gc_alloc_region_counts is not updated properly after 6604422
apetrusenko
parents:
846
diff
changeset
|
3184 _gc_alloc_region_counts[ap] = 0; |
| 636 | 3185 |
| 3186 if (r != NULL) { | |
| 3187 // we retain nothing on _gc_alloc_regions between GCs | |
| 3188 set_gc_alloc_region(ap, NULL); | |
| 3189 | |
| 3190 if (r->is_empty()) { | |
| 3191 // we didn't actually allocate anything in it; let's just put | |
| 3192 // it on the free list | |
| 342 | 3193 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); |
| 3194 r->set_zero_fill_complete(); | |
| 3195 put_free_region_on_list_locked(r); | |
| 636 | 3196 } else if (_retain_gc_alloc_region[ap] && !totally) { |
| 3197 // retain it so that we can use it at the beginning of the next GC | |
| 3198 _retained_gc_alloc_regions[ap] = r; | |
| 342 | 3199 } |
| 3200 } | |
| 636 | 3201 } |
| 3202 } | |
| 3203 | |
| 3204 #ifndef PRODUCT | |
| 3205 // Useful for debugging | |
| 3206 | |
| 3207 void G1CollectedHeap::print_gc_alloc_regions() { | |
| 3208 gclog_or_tty->print_cr("GC alloc regions"); | |
| 3209 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 3210 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 3211 if (r == NULL) { | |
| 3212 gclog_or_tty->print_cr(" %2d : "PTR_FORMAT, ap, NULL); | |
| 3213 } else { | |
| 3214 gclog_or_tty->print_cr(" %2d : "PTR_FORMAT" "SIZE_FORMAT, | |
| 3215 ap, r->bottom(), r->used()); | |
| 3216 } | |
| 3217 } | |
| 3218 } | |
| 3219 #endif // PRODUCT | |
| 342 | 3220 |
| 3221 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
| 3222 _drain_in_progress = false; | |
| 3223 set_evac_failure_closure(cl); | |
| 3224 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 3225 } | |
| 3226 | |
| 3227 void G1CollectedHeap::finalize_for_evac_failure() { | |
| 3228 assert(_evac_failure_scan_stack != NULL && | |
| 3229 _evac_failure_scan_stack->length() == 0, | |
| 3230 "Postcondition"); | |
| 3231 assert(!_drain_in_progress, "Postcondition"); | |
| 1045 | 3232 delete _evac_failure_scan_stack; |
| 342 | 3233 _evac_failure_scan_stack = NULL; |
| 3234 } | |
| 3235 | |
| 3236 | |
| 3237 | |
| 3238 // *** Sequential G1 Evacuation | |
| 3239 | |
| 3240 HeapWord* G1CollectedHeap::allocate_during_gc(GCAllocPurpose purpose, size_t word_size) { | |
| 3241 HeapRegion* alloc_region = _gc_alloc_regions[purpose]; | |
| 3242 // let the caller handle alloc failure | |
| 3243 if (alloc_region == NULL) return NULL; | |
| 3244 assert(isHumongous(word_size) || !alloc_region->isHumongous(), | |
| 3245 "Either the object is humongous or the region isn't"); | |
| 3246 HeapWord* block = alloc_region->allocate(word_size); | |
| 3247 if (block == NULL) { | |
| 3248 block = allocate_during_gc_slow(purpose, alloc_region, false, word_size); | |
| 3249 } | |
| 3250 return block; | |
| 3251 } | |
| 3252 | |
| 3253 class G1IsAliveClosure: public BoolObjectClosure { | |
| 3254 G1CollectedHeap* _g1; | |
| 3255 public: | |
| 3256 G1IsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
| 3257 void do_object(oop p) { assert(false, "Do not call."); } | |
| 3258 bool do_object_b(oop p) { | |
| 3259 // It is reachable if it is outside the collection set, or is inside | |
| 3260 // and forwarded. | |
| 3261 | |
| 3262 #ifdef G1_DEBUG | |
| 3263 gclog_or_tty->print_cr("is alive "PTR_FORMAT" in CS %d forwarded %d overall %d", | |
| 3264 (void*) p, _g1->obj_in_cs(p), p->is_forwarded(), | |
| 3265 !_g1->obj_in_cs(p) || p->is_forwarded()); | |
| 3266 #endif // G1_DEBUG | |
| 3267 | |
| 3268 return !_g1->obj_in_cs(p) || p->is_forwarded(); | |
| 3269 } | |
| 3270 }; | |
| 3271 | |
| 3272 class G1KeepAliveClosure: public OopClosure { | |
| 3273 G1CollectedHeap* _g1; | |
| 3274 public: | |
| 3275 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
|
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3276 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
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3277 void do_oop( oop* p) { |
| 342 | 3278 oop obj = *p; |
| 3279 #ifdef G1_DEBUG | |
| 3280 if (PrintGC && Verbose) { | |
| 3281 gclog_or_tty->print_cr("keep alive *"PTR_FORMAT" = "PTR_FORMAT" "PTR_FORMAT, | |
| 3282 p, (void*) obj, (void*) *p); | |
| 3283 } | |
| 3284 #endif // G1_DEBUG | |
| 3285 | |
| 3286 if (_g1->obj_in_cs(obj)) { | |
| 3287 assert( obj->is_forwarded(), "invariant" ); | |
| 3288 *p = obj->forwardee(); | |
| 3289 #ifdef G1_DEBUG | |
| 3290 gclog_or_tty->print_cr(" in CSet: moved "PTR_FORMAT" -> "PTR_FORMAT, | |
| 3291 (void*) obj, (void*) *p); | |
| 3292 #endif // G1_DEBUG | |
| 3293 } | |
| 3294 } | |
| 3295 }; | |
| 3296 | |
|
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3297 class UpdateRSetImmediate : public OopsInHeapRegionClosure { |
| 342 | 3298 private: |
| 3299 G1CollectedHeap* _g1; | |
| 3300 G1RemSet* _g1_rem_set; | |
| 3301 public: | |
|
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3302 UpdateRSetImmediate(G1CollectedHeap* g1) : |
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3303 _g1(g1), _g1_rem_set(g1->g1_rem_set()) {} |
| 342 | 3304 |
|
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3305 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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3306 virtual void do_oop( oop* p) { do_oop_work(p); } |
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3307 template <class T> void do_oop_work(T* p) { |
| 342 | 3308 assert(_from->is_in_reserved(p), "paranoia"); |
|
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3309 T heap_oop = oopDesc::load_heap_oop(p); |
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3310 if (!oopDesc::is_null(heap_oop) && !_from->is_survivor()) { |
|
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3311 _g1_rem_set->par_write_ref(_from, p, 0); |
| 342 | 3312 } |
| 3313 } | |
| 3314 }; | |
| 3315 | |
|
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3316 class UpdateRSetDeferred : public OopsInHeapRegionClosure { |
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3317 private: |
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3318 G1CollectedHeap* _g1; |
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3319 DirtyCardQueue *_dcq; |
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3320 CardTableModRefBS* _ct_bs; |
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3321 |
|
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3322 public: |
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3323 UpdateRSetDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
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3324 _g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) {} |
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3325 |
|
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3326 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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3327 virtual void do_oop( oop* p) { do_oop_work(p); } |
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3328 template <class T> void do_oop_work(T* p) { |
|
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3329 assert(_from->is_in_reserved(p), "paranoia"); |
|
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3330 if (!_from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && |
|
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3331 !_from->is_survivor()) { |
|
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3332 size_t card_index = _ct_bs->index_for(p); |
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3333 if (_ct_bs->mark_card_deferred(card_index)) { |
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3334 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
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3335 } |
|
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|
3336 } |
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|
3337 } |
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|
3338 }; |
|
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|
3339 |
|
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3340 |
|
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|
3341 |
| 342 | 3342 class RemoveSelfPointerClosure: public ObjectClosure { |
| 3343 private: | |
| 3344 G1CollectedHeap* _g1; | |
| 3345 ConcurrentMark* _cm; | |
| 3346 HeapRegion* _hr; | |
| 3347 size_t _prev_marked_bytes; | |
| 3348 size_t _next_marked_bytes; | |
|
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|
3349 OopsInHeapRegionClosure *_cl; |
| 342 | 3350 public: |
|
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|
3351 RemoveSelfPointerClosure(G1CollectedHeap* g1, OopsInHeapRegionClosure* cl) : |
|
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3352 _g1(g1), _cm(_g1->concurrent_mark()), _prev_marked_bytes(0), |
|
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3353 _next_marked_bytes(0), _cl(cl) {} |
| 342 | 3354 |
| 3355 size_t prev_marked_bytes() { return _prev_marked_bytes; } | |
| 3356 size_t next_marked_bytes() { return _next_marked_bytes; } | |
| 3357 | |
|
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3358 // The original idea here was to coalesce evacuated and dead objects. |
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3359 // However that caused complications with the block offset table (BOT). |
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3360 // In particular if there were two TLABs, one of them partially refined. |
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3361 // |----- TLAB_1--------|----TLAB_2-~~~(partially refined part)~~~| |
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3362 // The BOT entries of the unrefined part of TLAB_2 point to the start |
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3363 // of TLAB_2. If the last object of the TLAB_1 and the first object |
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3364 // of TLAB_2 are coalesced, then the cards of the unrefined part |
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3365 // would point into middle of the filler object. |
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3366 // |
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3367 // The current approach is to not coalesce and leave the BOT contents intact. |
|
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3368 void do_object(oop obj) { |
|
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3369 if (obj->is_forwarded() && obj->forwardee() == obj) { |
|
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3370 // The object failed to move. |
|
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3371 assert(!_g1->is_obj_dead(obj), "We should not be preserving dead objs."); |
|
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3372 _cm->markPrev(obj); |
|
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3373 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
|
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3374 _prev_marked_bytes += (obj->size() * HeapWordSize); |
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3375 if (_g1->mark_in_progress() && !_g1->is_obj_ill(obj)) { |
|
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3376 _cm->markAndGrayObjectIfNecessary(obj); |
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3377 } |
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3378 obj->set_mark(markOopDesc::prototype()); |
|
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3379 // While we were processing RSet buffers during the |
|
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3380 // collection, we actually didn't scan any cards on the |
|
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3381 // collection set, since we didn't want to update remebered |
|
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3382 // sets with entries that point into the collection set, given |
|
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3383 // that live objects fromthe collection set are about to move |
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3384 // and such entries will be stale very soon. This change also |
|
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3385 // dealt with a reliability issue which involved scanning a |
|
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3386 // card in the collection set and coming across an array that |
|
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3387 // was being chunked and looking malformed. The problem is |
|
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3388 // that, if evacuation fails, we might have remembered set |
|
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3389 // entries missing given that we skipped cards on the |
|
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3390 // collection set. So, we'll recreate such entries now. |
|
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|
3391 obj->oop_iterate(_cl); |
|
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|
3392 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
|
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|
3393 } else { |
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3394 // The object has been either evacuated or is dead. Fill it with a |
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3395 // dummy object. |
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3396 MemRegion mr((HeapWord*)obj, obj->size()); |
|
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3397 CollectedHeap::fill_with_object(mr); |
| 342 | 3398 _cm->clearRangeBothMaps(mr); |
| 3399 } | |
| 3400 } | |
| 3401 }; | |
| 3402 | |
| 3403 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
|
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3404 UpdateRSetImmediate immediate_update(_g1h); |
|
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3405 DirtyCardQueue dcq(&_g1h->dirty_card_queue_set()); |
|
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|
3406 UpdateRSetDeferred deferred_update(_g1h, &dcq); |
|
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3407 OopsInHeapRegionClosure *cl; |
|
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3408 if (G1DeferredRSUpdate) { |
|
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3409 cl = &deferred_update; |
|
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|
3410 } else { |
|
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|
3411 cl = &immediate_update; |
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|
3412 } |
| 342 | 3413 HeapRegion* cur = g1_policy()->collection_set(); |
| 3414 while (cur != NULL) { | |
| 3415 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
| 3416 | |
|
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3417 RemoveSelfPointerClosure rspc(_g1h, cl); |
| 342 | 3418 if (cur->evacuation_failed()) { |
| 3419 assert(cur->in_collection_set(), "bad CS"); | |
|
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|
3420 cl->set_region(cur); |
| 342 | 3421 cur->object_iterate(&rspc); |
| 3422 | |
| 3423 // A number of manipulations to make the TAMS be the current top, | |
| 3424 // and the marked bytes be the ones observed in the iteration. | |
| 3425 if (_g1h->concurrent_mark()->at_least_one_mark_complete()) { | |
| 3426 // The comments below are the postconditions achieved by the | |
| 3427 // calls. Note especially the last such condition, which says that | |
| 3428 // the count of marked bytes has been properly restored. | |
| 3429 cur->note_start_of_marking(false); | |
| 3430 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
| 3431 cur->add_to_marked_bytes(rspc.prev_marked_bytes()); | |
| 3432 // _next_marked_bytes == prev_marked_bytes. | |
| 3433 cur->note_end_of_marking(); | |
| 3434 // _prev_top_at_mark_start == top(), | |
| 3435 // _prev_marked_bytes == prev_marked_bytes | |
| 3436 } | |
| 3437 // If there is no mark in progress, we modified the _next variables | |
| 3438 // above needlessly, but harmlessly. | |
| 3439 if (_g1h->mark_in_progress()) { | |
| 3440 cur->note_start_of_marking(false); | |
| 3441 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
| 3442 // _next_marked_bytes == next_marked_bytes. | |
| 3443 } | |
| 3444 | |
| 3445 // Now make sure the region has the right index in the sorted array. | |
| 3446 g1_policy()->note_change_in_marked_bytes(cur); | |
| 3447 } | |
| 3448 cur = cur->next_in_collection_set(); | |
| 3449 } | |
| 3450 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
| 3451 | |
| 3452 // Now restore saved marks, if any. | |
| 3453 if (_objs_with_preserved_marks != NULL) { | |
| 3454 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
| 3455 assert(_objs_with_preserved_marks->length() == | |
| 3456 _preserved_marks_of_objs->length(), "Both or none."); | |
| 3457 guarantee(_objs_with_preserved_marks->length() == | |
| 3458 _preserved_marks_of_objs->length(), "Both or none."); | |
| 3459 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
| 3460 oop obj = _objs_with_preserved_marks->at(i); | |
| 3461 markOop m = _preserved_marks_of_objs->at(i); | |
| 3462 obj->set_mark(m); | |
| 3463 } | |
| 3464 // Delete the preserved marks growable arrays (allocated on the C heap). | |
| 3465 delete _objs_with_preserved_marks; | |
| 3466 delete _preserved_marks_of_objs; | |
| 3467 _objs_with_preserved_marks = NULL; | |
| 3468 _preserved_marks_of_objs = NULL; | |
| 3469 } | |
| 3470 } | |
| 3471 | |
| 3472 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
| 3473 _evac_failure_scan_stack->push(obj); | |
| 3474 } | |
| 3475 | |
| 3476 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
| 3477 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
| 3478 | |
| 3479 while (_evac_failure_scan_stack->length() > 0) { | |
| 3480 oop obj = _evac_failure_scan_stack->pop(); | |
| 3481 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
| 3482 obj->oop_iterate_backwards(_evac_failure_closure); | |
| 3483 } | |
| 3484 } | |
| 3485 | |
| 3486 void G1CollectedHeap::handle_evacuation_failure(oop old) { | |
| 3487 markOop m = old->mark(); | |
| 3488 // forward to self | |
| 3489 assert(!old->is_forwarded(), "precondition"); | |
| 3490 | |
| 3491 old->forward_to(old); | |
| 3492 handle_evacuation_failure_common(old, m); | |
| 3493 } | |
| 3494 | |
| 3495 oop | |
| 3496 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
| 3497 oop old) { | |
| 3498 markOop m = old->mark(); | |
| 3499 oop forward_ptr = old->forward_to_atomic(old); | |
| 3500 if (forward_ptr == NULL) { | |
| 3501 // Forward-to-self succeeded. | |
| 3502 if (_evac_failure_closure != cl) { | |
| 3503 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
| 3504 assert(!_drain_in_progress, | |
| 3505 "Should only be true while someone holds the lock."); | |
| 3506 // Set the global evac-failure closure to the current thread's. | |
| 3507 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
| 3508 set_evac_failure_closure(cl); | |
| 3509 // Now do the common part. | |
| 3510 handle_evacuation_failure_common(old, m); | |
| 3511 // Reset to NULL. | |
| 3512 set_evac_failure_closure(NULL); | |
| 3513 } else { | |
| 3514 // The lock is already held, and this is recursive. | |
| 3515 assert(_drain_in_progress, "This should only be the recursive case."); | |
| 3516 handle_evacuation_failure_common(old, m); | |
| 3517 } | |
| 3518 return old; | |
| 3519 } else { | |
| 3520 // Someone else had a place to copy it. | |
| 3521 return forward_ptr; | |
| 3522 } | |
| 3523 } | |
| 3524 | |
| 3525 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
| 3526 set_evacuation_failed(true); | |
| 3527 | |
| 3528 preserve_mark_if_necessary(old, m); | |
| 3529 | |
| 3530 HeapRegion* r = heap_region_containing(old); | |
| 3531 if (!r->evacuation_failed()) { | |
| 3532 r->set_evacuation_failed(true); | |
| 1282 | 3533 if (G1PrintHeapRegions) { |
| 342 | 3534 gclog_or_tty->print("evacuation failed in heap region "PTR_FORMAT" " |
| 3535 "["PTR_FORMAT","PTR_FORMAT")\n", | |
| 3536 r, r->bottom(), r->end()); | |
| 3537 } | |
| 3538 } | |
| 3539 | |
| 3540 push_on_evac_failure_scan_stack(old); | |
| 3541 | |
| 3542 if (!_drain_in_progress) { | |
| 3543 // prevent recursion in copy_to_survivor_space() | |
| 3544 _drain_in_progress = true; | |
| 3545 drain_evac_failure_scan_stack(); | |
| 3546 _drain_in_progress = false; | |
| 3547 } | |
| 3548 } | |
| 3549 | |
| 3550 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
| 3551 if (m != markOopDesc::prototype()) { | |
| 3552 if (_objs_with_preserved_marks == NULL) { | |
| 3553 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
| 3554 _objs_with_preserved_marks = | |
| 3555 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 3556 _preserved_marks_of_objs = | |
| 3557 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
| 3558 } | |
| 3559 _objs_with_preserved_marks->push(obj); | |
| 3560 _preserved_marks_of_objs->push(m); | |
| 3561 } | |
| 3562 } | |
| 3563 | |
| 3564 // *** Parallel G1 Evacuation | |
| 3565 | |
| 3566 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
| 3567 size_t word_size) { | |
| 3568 HeapRegion* alloc_region = _gc_alloc_regions[purpose]; | |
| 3569 // let the caller handle alloc failure | |
| 3570 if (alloc_region == NULL) return NULL; | |
| 3571 | |
| 3572 HeapWord* block = alloc_region->par_allocate(word_size); | |
| 3573 if (block == NULL) { | |
| 3574 MutexLockerEx x(par_alloc_during_gc_lock(), | |
| 3575 Mutex::_no_safepoint_check_flag); | |
| 3576 block = allocate_during_gc_slow(purpose, alloc_region, true, word_size); | |
| 3577 } | |
| 3578 return block; | |
| 3579 } | |
| 3580 | |
| 545 | 3581 void G1CollectedHeap::retire_alloc_region(HeapRegion* alloc_region, |
| 3582 bool par) { | |
| 3583 // Another thread might have obtained alloc_region for the given | |
| 3584 // purpose, and might be attempting to allocate in it, and might | |
| 3585 // succeed. Therefore, we can't do the "finalization" stuff on the | |
| 3586 // region below until we're sure the last allocation has happened. | |
| 3587 // We ensure this by allocating the remaining space with a garbage | |
| 3588 // object. | |
| 3589 if (par) par_allocate_remaining_space(alloc_region); | |
| 3590 // Now we can do the post-GC stuff on the region. | |
| 3591 alloc_region->note_end_of_copying(); | |
| 3592 g1_policy()->record_after_bytes(alloc_region->used()); | |
| 3593 } | |
| 3594 | |
| 342 | 3595 HeapWord* |
| 3596 G1CollectedHeap::allocate_during_gc_slow(GCAllocPurpose purpose, | |
| 3597 HeapRegion* alloc_region, | |
| 3598 bool par, | |
| 3599 size_t word_size) { | |
| 3600 HeapWord* block = NULL; | |
| 3601 // In the parallel case, a previous thread to obtain the lock may have | |
| 3602 // already assigned a new gc_alloc_region. | |
| 3603 if (alloc_region != _gc_alloc_regions[purpose]) { | |
| 3604 assert(par, "But should only happen in parallel case."); | |
| 3605 alloc_region = _gc_alloc_regions[purpose]; | |
| 3606 if (alloc_region == NULL) return NULL; | |
| 3607 block = alloc_region->par_allocate(word_size); | |
| 3608 if (block != NULL) return block; | |
| 3609 // Otherwise, continue; this new region is empty, too. | |
| 3610 } | |
| 3611 assert(alloc_region != NULL, "We better have an allocation region"); | |
| 545 | 3612 retire_alloc_region(alloc_region, par); |
| 342 | 3613 |
| 3614 if (_gc_alloc_region_counts[purpose] >= g1_policy()->max_regions(purpose)) { | |
| 3615 // Cannot allocate more regions for the given purpose. | |
| 3616 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(purpose); | |
| 3617 // Is there an alternative? | |
| 3618 if (purpose != alt_purpose) { | |
| 3619 HeapRegion* alt_region = _gc_alloc_regions[alt_purpose]; | |
| 3620 // Has not the alternative region been aliased? | |
| 545 | 3621 if (alloc_region != alt_region && alt_region != NULL) { |
| 342 | 3622 // Try to allocate in the alternative region. |
| 3623 if (par) { | |
| 3624 block = alt_region->par_allocate(word_size); | |
| 3625 } else { | |
| 3626 block = alt_region->allocate(word_size); | |
| 3627 } | |
| 3628 // Make an alias. | |
| 3629 _gc_alloc_regions[purpose] = _gc_alloc_regions[alt_purpose]; | |
| 545 | 3630 if (block != NULL) { |
| 3631 return block; | |
| 3632 } | |
| 3633 retire_alloc_region(alt_region, par); | |
| 342 | 3634 } |
| 3635 // Both the allocation region and the alternative one are full | |
| 3636 // and aliased, replace them with a new allocation region. | |
| 3637 purpose = alt_purpose; | |
| 3638 } else { | |
| 3639 set_gc_alloc_region(purpose, NULL); | |
| 3640 return NULL; | |
| 3641 } | |
| 3642 } | |
| 3643 | |
| 3644 // Now allocate a new region for allocation. | |
| 3645 alloc_region = newAllocRegionWithExpansion(purpose, word_size, false /*zero_filled*/); | |
| 3646 | |
| 3647 // let the caller handle alloc failure | |
| 3648 if (alloc_region != NULL) { | |
| 3649 | |
| 3650 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
| 3651 assert(alloc_region->saved_mark_at_top(), | |
| 3652 "Mark should have been saved already."); | |
| 3653 // We used to assert that the region was zero-filled here, but no | |
| 3654 // longer. | |
| 3655 | |
| 3656 // This must be done last: once it's installed, other regions may | |
| 3657 // allocate in it (without holding the lock.) | |
| 3658 set_gc_alloc_region(purpose, alloc_region); | |
| 3659 | |
| 3660 if (par) { | |
| 3661 block = alloc_region->par_allocate(word_size); | |
| 3662 } else { | |
| 3663 block = alloc_region->allocate(word_size); | |
| 3664 } | |
| 3665 // Caller handles alloc failure. | |
| 3666 } else { | |
| 3667 // This sets other apis using the same old alloc region to NULL, also. | |
| 3668 set_gc_alloc_region(purpose, NULL); | |
| 3669 } | |
| 3670 return block; // May be NULL. | |
| 3671 } | |
| 3672 | |
| 3673 void G1CollectedHeap::par_allocate_remaining_space(HeapRegion* r) { | |
| 3674 HeapWord* block = NULL; | |
| 3675 size_t free_words; | |
| 3676 do { | |
| 3677 free_words = r->free()/HeapWordSize; | |
| 3678 // If there's too little space, no one can allocate, so we're done. | |
| 3679 if (free_words < (size_t)oopDesc::header_size()) return; | |
| 3680 // Otherwise, try to claim it. | |
| 3681 block = r->par_allocate(free_words); | |
| 3682 } while (block == NULL); | |
|
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|
3683 fill_with_object(block, free_words); |
| 342 | 3684 } |
| 3685 | |
| 3686 #ifndef PRODUCT | |
| 3687 bool GCLabBitMapClosure::do_bit(size_t offset) { | |
| 3688 HeapWord* addr = _bitmap->offsetToHeapWord(offset); | |
| 3689 guarantee(_cm->isMarked(oop(addr)), "it should be!"); | |
| 3690 return true; | |
| 3691 } | |
| 3692 #endif // PRODUCT | |
| 3693 | |
|
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3694 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) |
|
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3695 : _g1h(g1h), |
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|
3696 _refs(g1h->task_queue(queue_num)), |
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|
3697 _dcq(&g1h->dirty_card_queue_set()), |
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|
3698 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
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|
3699 _g1_rem(g1h->g1_rem_set()), |
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|
3700 _hash_seed(17), _queue_num(queue_num), |
|
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|
3701 _term_attempts(0), |
|
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|
3702 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
|
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|
3703 _tenured_alloc_buffer(g1h->desired_plab_sz(GCAllocForTenured)), |
|
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3704 _age_table(false), |
| 342 | 3705 #if G1_DETAILED_STATS |
|
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3706 _pushes(0), _pops(0), _steals(0), |
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|
3707 _steal_attempts(0), _overflow_pushes(0), |
| 342 | 3708 #endif |
|
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3709 _strong_roots_time(0), _term_time(0), |
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3710 _alloc_buffer_waste(0), _undo_waste(0) |
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3711 { |
|
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3712 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
|
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3713 // we "sacrifice" entry 0 to keep track of surviving bytes for |
|
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3714 // non-young regions (where the age is -1) |
|
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3715 // We also add a few elements at the beginning and at the end in |
|
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|
3716 // an attempt to eliminate cache contention |
|
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|
3717 size_t real_length = 1 + _g1h->g1_policy()->young_cset_length(); |
|
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3718 size_t array_length = PADDING_ELEM_NUM + |
|
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|
3719 real_length + |
|
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|
3720 PADDING_ELEM_NUM; |
|
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|
3721 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); |
|
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|
3722 if (_surviving_young_words_base == NULL) |
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|
3723 vm_exit_out_of_memory(array_length * sizeof(size_t), |
|
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|
3724 "Not enough space for young surv histo."); |
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3725 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; |
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3726 memset(_surviving_young_words, 0, real_length * sizeof(size_t)); |
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3727 |
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3728 _overflowed_refs = new OverflowQueue(10); |
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3729 |
|
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3730 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
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3731 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
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3732 |
|
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3733 _start = os::elapsedTime(); |
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3734 } |
| 342 | 3735 |
| 3736 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : | |
| 3737 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), | |
| 3738 _par_scan_state(par_scan_state) { } | |
| 3739 | |
|
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3740 template <class T> void G1ParCopyHelper::mark_forwardee(T* p) { |
| 342 | 3741 // This is called _after_ do_oop_work has been called, hence after |
| 3742 // the object has been relocated to its new location and *p points | |
| 3743 // to its new location. | |
| 3744 | |
|
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3745 T heap_oop = oopDesc::load_heap_oop(p); |
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3746 if (!oopDesc::is_null(heap_oop)) { |
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3747 oop obj = oopDesc::decode_heap_oop(heap_oop); |
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3748 assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj)), |
| 342 | 3749 "shouldn't still be in the CSet if evacuation didn't fail."); |
|
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3750 HeapWord* addr = (HeapWord*)obj; |
| 342 | 3751 if (_g1->is_in_g1_reserved(addr)) |
| 3752 _cm->grayRoot(oop(addr)); | |
| 3753 } | |
| 3754 } | |
| 3755 | |
| 3756 oop G1ParCopyHelper::copy_to_survivor_space(oop old) { | |
| 3757 size_t word_sz = old->size(); | |
| 3758 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
| 3759 // +1 to make the -1 indexes valid... | |
| 3760 int young_index = from_region->young_index_in_cset()+1; | |
| 3761 assert( (from_region->is_young() && young_index > 0) || | |
| 3762 (!from_region->is_young() && young_index == 0), "invariant" ); | |
| 3763 G1CollectorPolicy* g1p = _g1->g1_policy(); | |
| 3764 markOop m = old->mark(); | |
| 545 | 3765 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
| 3766 : m->age(); | |
| 3767 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
| 342 | 3768 word_sz); |
| 3769 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
| 3770 oop obj = oop(obj_ptr); | |
| 3771 | |
| 3772 if (obj_ptr == NULL) { | |
| 3773 // This will either forward-to-self, or detect that someone else has | |
| 3774 // installed a forwarding pointer. | |
| 3775 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
| 3776 return _g1->handle_evacuation_failure_par(cl, old); | |
| 3777 } | |
| 3778 | |
| 526 | 3779 // We're going to allocate linearly, so might as well prefetch ahead. |
| 3780 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
| 3781 | |
| 342 | 3782 oop forward_ptr = old->forward_to_atomic(obj); |
| 3783 if (forward_ptr == NULL) { | |
| 3784 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
| 526 | 3785 if (g1p->track_object_age(alloc_purpose)) { |
| 3786 // We could simply do obj->incr_age(). However, this causes a | |
| 3787 // performance issue. obj->incr_age() will first check whether | |
| 3788 // the object has a displaced mark by checking its mark word; | |
| 3789 // getting the mark word from the new location of the object | |
| 3790 // stalls. So, given that we already have the mark word and we | |
| 3791 // are about to install it anyway, it's better to increase the | |
| 3792 // age on the mark word, when the object does not have a | |
| 3793 // displaced mark word. We're not expecting many objects to have | |
| 3794 // a displaced marked word, so that case is not optimized | |
| 3795 // further (it could be...) and we simply call obj->incr_age(). | |
| 3796 | |
| 3797 if (m->has_displaced_mark_helper()) { | |
| 3798 // in this case, we have to install the mark word first, | |
| 3799 // otherwise obj looks to be forwarded (the old mark word, | |
| 3800 // which contains the forward pointer, was copied) | |
| 3801 obj->set_mark(m); | |
| 3802 obj->incr_age(); | |
| 3803 } else { | |
| 3804 m = m->incr_age(); | |
| 545 | 3805 obj->set_mark(m); |
| 526 | 3806 } |
| 545 | 3807 _par_scan_state->age_table()->add(obj, word_sz); |
| 3808 } else { | |
| 3809 obj->set_mark(m); | |
| 526 | 3810 } |
| 3811 | |
| 342 | 3812 // preserve "next" mark bit |
| 3813 if (_g1->mark_in_progress() && !_g1->is_obj_ill(old)) { | |
| 3814 if (!use_local_bitmaps || | |
| 3815 !_par_scan_state->alloc_buffer(alloc_purpose)->mark(obj_ptr)) { | |
| 3816 // if we couldn't mark it on the local bitmap (this happens when | |
| 3817 // the object was not allocated in the GCLab), we have to bite | |
| 3818 // the bullet and do the standard parallel mark | |
| 3819 _cm->markAndGrayObjectIfNecessary(obj); | |
| 3820 } | |
| 3821 #if 1 | |
| 3822 if (_g1->isMarkedNext(old)) { | |
| 3823 _cm->nextMarkBitMap()->parClear((HeapWord*)old); | |
| 3824 } | |
| 3825 #endif | |
| 3826 } | |
| 3827 | |
| 3828 size_t* surv_young_words = _par_scan_state->surviving_young_words(); | |
| 3829 surv_young_words[young_index] += word_sz; | |
| 3830 | |
| 3831 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
| 3832 arrayOop(old)->set_length(0); | |
|
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3833 oop* old_p = set_partial_array_mask(old); |
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3834 _par_scan_state->push_on_queue(old_p); |
| 342 | 3835 } else { |
| 526 | 3836 // No point in using the slower heap_region_containing() method, |
| 3837 // given that we know obj is in the heap. | |
| 3838 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
| 342 | 3839 obj->oop_iterate_backwards(_scanner); |
| 3840 } | |
| 3841 } else { | |
| 3842 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
| 3843 obj = forward_ptr; | |
| 3844 } | |
| 3845 return obj; | |
| 3846 } | |
| 3847 | |
|
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|
3848 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_forwardee> |
|
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3849 template <class T> |
|
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3850 void G1ParCopyClosure <do_gen_barrier, barrier, do_mark_forwardee> |
|
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3851 ::do_oop_work(T* p) { |
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3852 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 3853 assert(barrier != G1BarrierRS || obj != NULL, |
| 3854 "Precondition: G1BarrierRS implies obj is nonNull"); | |
| 3855 | |
| 526 | 3856 // here the null check is implicit in the cset_fast_test() test |
|
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3857 if (_g1->in_cset_fast_test(obj)) { |
| 342 | 3858 #if G1_REM_SET_LOGGING |
| 526 | 3859 gclog_or_tty->print_cr("Loc "PTR_FORMAT" contains pointer "PTR_FORMAT" " |
| 3860 "into CS.", p, (void*) obj); | |
| 342 | 3861 #endif |
| 526 | 3862 if (obj->is_forwarded()) { |
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|
3863 oopDesc::encode_store_heap_oop(p, obj->forwardee()); |
| 526 | 3864 } else { |
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3865 oop copy_oop = copy_to_survivor_space(obj); |
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|
3866 oopDesc::encode_store_heap_oop(p, copy_oop); |
| 342 | 3867 } |
| 526 | 3868 // When scanning the RS, we only care about objs in CS. |
| 3869 if (barrier == G1BarrierRS) { | |
|
616
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3870 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 342 | 3871 } |
| 526 | 3872 } |
| 3873 | |
| 3874 if (barrier == G1BarrierEvac && obj != NULL) { | |
|
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3875 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 526 | 3876 } |
| 3877 | |
| 3878 if (do_gen_barrier && obj != NULL) { | |
| 3879 par_do_barrier(p); | |
| 3880 } | |
| 3881 } | |
| 3882 | |
|
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3883 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
|
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3884 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
|
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3885 |
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3886 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
| 526 | 3887 assert(has_partial_array_mask(p), "invariant"); |
| 3888 oop old = clear_partial_array_mask(p); | |
| 342 | 3889 assert(old->is_objArray(), "must be obj array"); |
| 3890 assert(old->is_forwarded(), "must be forwarded"); | |
| 3891 assert(Universe::heap()->is_in_reserved(old), "must be in heap."); | |
| 3892 | |
| 3893 objArrayOop obj = objArrayOop(old->forwardee()); | |
| 3894 assert((void*)old != (void*)old->forwardee(), "self forwarding here?"); | |
| 3895 // Process ParGCArrayScanChunk elements now | |
| 3896 // and push the remainder back onto queue | |
| 3897 int start = arrayOop(old)->length(); | |
| 3898 int end = obj->length(); | |
| 3899 int remainder = end - start; | |
| 3900 assert(start <= end, "just checking"); | |
| 3901 if (remainder > 2 * ParGCArrayScanChunk) { | |
| 3902 // Test above combines last partial chunk with a full chunk | |
| 3903 end = start + ParGCArrayScanChunk; | |
| 3904 arrayOop(old)->set_length(end); | |
| 3905 // Push remainder. | |
|
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|
3906 oop* old_p = set_partial_array_mask(old); |
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|
3907 assert(arrayOop(old)->length() < obj->length(), "Empty push?"); |
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|
3908 _par_scan_state->push_on_queue(old_p); |
| 342 | 3909 } else { |
| 3910 // Restore length so that the heap remains parsable in | |
| 3911 // case of evacuation failure. | |
| 3912 arrayOop(old)->set_length(end); | |
| 3913 } | |
|
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|
3914 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
| 342 | 3915 // process our set of indices (include header in first chunk) |
|
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|
3916 obj->oop_iterate_range(&_scanner, start, end); |
| 342 | 3917 } |
| 3918 | |
| 3919 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
| 3920 protected: | |
| 3921 G1CollectedHeap* _g1h; | |
| 3922 G1ParScanThreadState* _par_scan_state; | |
| 3923 RefToScanQueueSet* _queues; | |
| 3924 ParallelTaskTerminator* _terminator; | |
| 3925 | |
| 3926 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
| 3927 RefToScanQueueSet* queues() { return _queues; } | |
| 3928 ParallelTaskTerminator* terminator() { return _terminator; } | |
| 3929 | |
| 3930 public: | |
| 3931 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
| 3932 G1ParScanThreadState* par_scan_state, | |
| 3933 RefToScanQueueSet* queues, | |
| 3934 ParallelTaskTerminator* terminator) | |
| 3935 : _g1h(g1h), _par_scan_state(par_scan_state), | |
| 3936 _queues(queues), _terminator(terminator) {} | |
| 3937 | |
| 3938 void do_void() { | |
| 3939 G1ParScanThreadState* pss = par_scan_state(); | |
| 3940 while (true) { | |
| 3941 pss->trim_queue(); | |
| 3942 IF_G1_DETAILED_STATS(pss->note_steal_attempt()); | |
|
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3943 |
|
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|
3944 StarTask stolen_task; |
|
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|
3945 if (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
| 342 | 3946 IF_G1_DETAILED_STATS(pss->note_steal()); |
| 526 | 3947 |
| 3948 // slightly paranoid tests; I'm trying to catch potential | |
| 3949 // problems before we go into push_on_queue to know where the | |
| 3950 // problem is coming from | |
|
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|
3951 assert((oop*)stolen_task != NULL, "Error"); |
|
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|
3952 if (stolen_task.is_narrow()) { |
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|
3953 assert(UseCompressedOops, "Error"); |
|
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|
3954 narrowOop* p = (narrowOop*) stolen_task; |
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|
3955 assert(has_partial_array_mask(p) || |
|
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|
3956 _g1h->is_in_g1_reserved(oopDesc::load_decode_heap_oop(p)), "Error"); |
|
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|
3957 pss->push_on_queue(p); |
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|
3958 } else { |
|
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|
3959 oop* p = (oop*) stolen_task; |
|
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|
3960 assert(has_partial_array_mask(p) || _g1h->is_in_g1_reserved(*p), "Error"); |
|
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3961 pss->push_on_queue(p); |
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|
3962 } |
| 342 | 3963 continue; |
| 3964 } | |
| 3965 pss->start_term_time(); | |
| 3966 if (terminator()->offer_termination()) break; | |
| 3967 pss->end_term_time(); | |
| 3968 } | |
| 3969 pss->end_term_time(); | |
| 3970 pss->retire_alloc_buffers(); | |
| 3971 } | |
| 3972 }; | |
| 3973 | |
| 3974 class G1ParTask : public AbstractGangTask { | |
| 3975 protected: | |
| 3976 G1CollectedHeap* _g1h; | |
| 3977 RefToScanQueueSet *_queues; | |
| 3978 ParallelTaskTerminator _terminator; | |
|
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3979 int _n_workers; |
| 342 | 3980 |
| 3981 Mutex _stats_lock; | |
| 3982 Mutex* stats_lock() { return &_stats_lock; } | |
| 3983 | |
| 3984 size_t getNCards() { | |
| 3985 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
| 3986 / G1BlockOffsetSharedArray::N_bytes; | |
| 3987 } | |
| 3988 | |
| 3989 public: | |
| 3990 G1ParTask(G1CollectedHeap* g1h, int workers, RefToScanQueueSet *task_queues) | |
| 3991 : AbstractGangTask("G1 collection"), | |
| 3992 _g1h(g1h), | |
| 3993 _queues(task_queues), | |
| 3994 _terminator(workers, _queues), | |
|
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3995 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true), |
|
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3996 _n_workers(workers) |
| 342 | 3997 {} |
| 3998 | |
| 3999 RefToScanQueueSet* queues() { return _queues; } | |
| 4000 | |
| 4001 RefToScanQueue *work_queue(int i) { | |
| 4002 return queues()->queue(i); | |
| 4003 } | |
| 4004 | |
| 4005 void work(int i) { | |
|
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4006 if (i >= _n_workers) return; // no work needed this round |
| 342 | 4007 ResourceMark rm; |
| 4008 HandleMark hm; | |
| 4009 | |
| 526 | 4010 G1ParScanThreadState pss(_g1h, i); |
| 4011 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss); | |
| 4012 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss); | |
| 4013 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss); | |
| 342 | 4014 |
| 4015 pss.set_evac_closure(&scan_evac_cl); | |
| 4016 pss.set_evac_failure_closure(&evac_failure_cl); | |
| 4017 pss.set_partial_scan_closure(&partial_scan_cl); | |
| 4018 | |
| 4019 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss); | |
| 4020 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss); | |
| 4021 G1ParScanHeapRSClosure only_scan_heap_rs_cl(_g1h, &pss); | |
|
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4022 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
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4023 |
| 342 | 4024 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss); |
| 4025 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss); | |
| 4026 G1ParScanAndMarkHeapRSClosure scan_mark_heap_rs_cl(_g1h, &pss); | |
| 4027 | |
| 4028 OopsInHeapRegionClosure *scan_root_cl; | |
| 4029 OopsInHeapRegionClosure *scan_perm_cl; | |
| 4030 OopsInHeapRegionClosure *scan_so_cl; | |
| 4031 | |
|
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4032 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
| 342 | 4033 scan_root_cl = &scan_mark_root_cl; |
| 4034 scan_perm_cl = &scan_mark_perm_cl; | |
| 4035 scan_so_cl = &scan_mark_heap_rs_cl; | |
| 4036 } else { | |
| 4037 scan_root_cl = &only_scan_root_cl; | |
| 4038 scan_perm_cl = &only_scan_perm_cl; | |
| 4039 scan_so_cl = &only_scan_heap_rs_cl; | |
| 4040 } | |
| 4041 | |
| 4042 pss.start_strong_roots(); | |
| 4043 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
| 4044 SharedHeap::SO_AllClasses, | |
| 4045 scan_root_cl, | |
|
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4046 &push_heap_rs_cl, |
| 342 | 4047 scan_so_cl, |
| 4048 scan_perm_cl, | |
| 4049 i); | |
| 4050 pss.end_strong_roots(); | |
| 4051 { | |
| 4052 double start = os::elapsedTime(); | |
| 4053 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
| 4054 evac.do_void(); | |
| 4055 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
| 4056 double term_ms = pss.term_time()*1000.0; | |
| 4057 _g1h->g1_policy()->record_obj_copy_time(i, elapsed_ms-term_ms); | |
| 4058 _g1h->g1_policy()->record_termination_time(i, term_ms); | |
| 4059 } | |
| 1282 | 4060 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
| 342 | 4061 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
| 4062 | |
| 4063 // Clean up any par-expanded rem sets. | |
| 4064 HeapRegionRemSet::par_cleanup(); | |
| 4065 | |
| 4066 MutexLocker x(stats_lock()); | |
| 4067 if (ParallelGCVerbose) { | |
| 4068 gclog_or_tty->print("Thread %d complete:\n", i); | |
| 4069 #if G1_DETAILED_STATS | |
| 4070 gclog_or_tty->print(" Pushes: %7d Pops: %7d Overflows: %7d Steals %7d (in %d attempts)\n", | |
| 4071 pss.pushes(), | |
| 4072 pss.pops(), | |
| 4073 pss.overflow_pushes(), | |
| 4074 pss.steals(), | |
| 4075 pss.steal_attempts()); | |
| 4076 #endif | |
| 4077 double elapsed = pss.elapsed(); | |
| 4078 double strong_roots = pss.strong_roots_time(); | |
| 4079 double term = pss.term_time(); | |
| 4080 gclog_or_tty->print(" Elapsed: %7.2f ms.\n" | |
| 4081 " Strong roots: %7.2f ms (%6.2f%%)\n" | |
| 4082 " Termination: %7.2f ms (%6.2f%%) (in %d entries)\n", | |
| 4083 elapsed * 1000.0, | |
| 4084 strong_roots * 1000.0, (strong_roots*100.0/elapsed), | |
| 4085 term * 1000.0, (term*100.0/elapsed), | |
| 4086 pss.term_attempts()); | |
| 4087 size_t total_waste = pss.alloc_buffer_waste() + pss.undo_waste(); | |
| 4088 gclog_or_tty->print(" Waste: %8dK\n" | |
| 4089 " Alloc Buffer: %8dK\n" | |
| 4090 " Undo: %8dK\n", | |
| 4091 (total_waste * HeapWordSize) / K, | |
| 4092 (pss.alloc_buffer_waste() * HeapWordSize) / K, | |
| 4093 (pss.undo_waste() * HeapWordSize) / K); | |
| 4094 } | |
| 4095 | |
| 4096 assert(pss.refs_to_scan() == 0, "Task queue should be empty"); | |
| 4097 assert(pss.overflowed_refs_to_scan() == 0, "Overflow queue should be empty"); | |
| 4098 } | |
| 4099 }; | |
| 4100 | |
| 4101 // *** Common G1 Evacuation Stuff | |
| 4102 | |
| 4103 void | |
| 4104 G1CollectedHeap:: | |
| 4105 g1_process_strong_roots(bool collecting_perm_gen, | |
| 4106 SharedHeap::ScanningOption so, | |
| 4107 OopClosure* scan_non_heap_roots, | |
| 4108 OopsInHeapRegionClosure* scan_rs, | |
| 4109 OopsInHeapRegionClosure* scan_so, | |
| 4110 OopsInGenClosure* scan_perm, | |
| 4111 int worker_i) { | |
| 4112 // First scan the strong roots, including the perm gen. | |
| 4113 double ext_roots_start = os::elapsedTime(); | |
| 4114 double closure_app_time_sec = 0.0; | |
| 4115 | |
| 4116 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
| 4117 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
| 4118 buf_scan_perm.set_generation(perm_gen()); | |
| 4119 | |
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4120 // Walk the code cache w/o buffering, because StarTask cannot handle |
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4121 // unaligned oop locations. |
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4122 CodeBlobToOopClosure eager_scan_code_roots(scan_non_heap_roots, /*do_marking=*/ true); |
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4123 |
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4124 process_strong_roots(false, // no scoping; this is parallel code |
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4125 collecting_perm_gen, so, |
| 342 | 4126 &buf_scan_non_heap_roots, |
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4127 &eager_scan_code_roots, |
| 342 | 4128 &buf_scan_perm); |
| 4129 // Finish up any enqueued closure apps. | |
| 4130 buf_scan_non_heap_roots.done(); | |
| 4131 buf_scan_perm.done(); | |
| 4132 double ext_roots_end = os::elapsedTime(); | |
| 4133 g1_policy()->reset_obj_copy_time(worker_i); | |
| 4134 double obj_copy_time_sec = | |
| 4135 buf_scan_non_heap_roots.closure_app_seconds() + | |
| 4136 buf_scan_perm.closure_app_seconds(); | |
| 4137 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); | |
| 4138 double ext_root_time_ms = | |
| 4139 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
| 4140 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); | |
| 4141 | |
| 4142 // Scan strong roots in mark stack. | |
| 4143 if (!_process_strong_tasks->is_task_claimed(G1H_PS_mark_stack_oops_do)) { | |
| 4144 concurrent_mark()->oops_do(scan_non_heap_roots); | |
| 4145 } | |
| 4146 double mark_stack_scan_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; | |
| 4147 g1_policy()->record_mark_stack_scan_time(worker_i, mark_stack_scan_ms); | |
| 4148 | |
| 4149 // XXX What should this be doing in the parallel case? | |
| 4150 g1_policy()->record_collection_pause_end_CH_strong_roots(); | |
| 4151 if (scan_so != NULL) { | |
| 4152 scan_scan_only_set(scan_so, worker_i); | |
| 4153 } | |
| 4154 // Now scan the complement of the collection set. | |
| 4155 if (scan_rs != NULL) { | |
| 4156 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
| 4157 } | |
| 4158 // Finish with the ref_processor roots. | |
| 4159 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { | |
| 4160 ref_processor()->oops_do(scan_non_heap_roots); | |
| 4161 } | |
| 4162 g1_policy()->record_collection_pause_end_G1_strong_roots(); | |
| 4163 _process_strong_tasks->all_tasks_completed(); | |
| 4164 } | |
| 4165 | |
| 4166 void | |
| 4167 G1CollectedHeap::scan_scan_only_region(HeapRegion* r, | |
| 4168 OopsInHeapRegionClosure* oc, | |
| 4169 int worker_i) { | |
| 4170 HeapWord* startAddr = r->bottom(); | |
| 4171 HeapWord* endAddr = r->used_region().end(); | |
| 4172 | |
| 4173 oc->set_region(r); | |
| 4174 | |
| 4175 HeapWord* p = r->bottom(); | |
| 4176 HeapWord* t = r->top(); | |
| 4177 guarantee( p == r->next_top_at_mark_start(), "invariant" ); | |
| 4178 while (p < t) { | |
| 4179 oop obj = oop(p); | |
| 4180 p += obj->oop_iterate(oc); | |
| 4181 } | |
| 4182 } | |
| 4183 | |
| 4184 void | |
| 4185 G1CollectedHeap::scan_scan_only_set(OopsInHeapRegionClosure* oc, | |
| 4186 int worker_i) { | |
| 4187 double start = os::elapsedTime(); | |
| 4188 | |
| 4189 BufferingOopsInHeapRegionClosure boc(oc); | |
| 4190 | |
| 4191 FilterInHeapRegionAndIntoCSClosure scan_only(this, &boc); | |
| 4192 FilterAndMarkInHeapRegionAndIntoCSClosure scan_and_mark(this, &boc, concurrent_mark()); | |
| 4193 | |
| 4194 OopsInHeapRegionClosure *foc; | |
|
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4195 if (g1_policy()->during_initial_mark_pause()) |
| 342 | 4196 foc = &scan_and_mark; |
| 4197 else | |
| 4198 foc = &scan_only; | |
| 4199 | |
| 4200 HeapRegion* hr; | |
| 4201 int n = 0; | |
| 4202 while ((hr = _young_list->par_get_next_scan_only_region()) != NULL) { | |
| 4203 scan_scan_only_region(hr, foc, worker_i); | |
| 4204 ++n; | |
| 4205 } | |
| 4206 boc.done(); | |
| 4207 | |
| 4208 double closure_app_s = boc.closure_app_seconds(); | |
| 4209 g1_policy()->record_obj_copy_time(worker_i, closure_app_s * 1000.0); | |
| 4210 double ms = (os::elapsedTime() - start - closure_app_s)*1000.0; | |
| 4211 g1_policy()->record_scan_only_time(worker_i, ms, n); | |
| 4212 } | |
| 4213 | |
| 4214 void | |
| 4215 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
| 4216 OopClosure* non_root_closure) { | |
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4217 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
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4218 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
| 342 | 4219 } |
| 4220 | |
| 4221 | |
| 4222 class SaveMarksClosure: public HeapRegionClosure { | |
| 4223 public: | |
| 4224 bool doHeapRegion(HeapRegion* r) { | |
| 4225 r->save_marks(); | |
| 4226 return false; | |
| 4227 } | |
| 4228 }; | |
| 4229 | |
| 4230 void G1CollectedHeap::save_marks() { | |
| 4231 if (ParallelGCThreads == 0) { | |
| 4232 SaveMarksClosure sm; | |
| 4233 heap_region_iterate(&sm); | |
| 4234 } | |
| 4235 // We do this even in the parallel case | |
| 4236 perm_gen()->save_marks(); | |
| 4237 } | |
| 4238 | |
| 4239 void G1CollectedHeap::evacuate_collection_set() { | |
| 4240 set_evacuation_failed(false); | |
| 4241 | |
| 4242 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
| 4243 concurrent_g1_refine()->set_use_cache(false); | |
| 889 | 4244 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
| 4245 | |
| 342 | 4246 int n_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); |
| 4247 set_par_threads(n_workers); | |
| 4248 G1ParTask g1_par_task(this, n_workers, _task_queues); | |
| 4249 | |
| 4250 init_for_evac_failure(NULL); | |
| 4251 | |
| 4252 rem_set()->prepare_for_younger_refs_iterate(true); | |
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4253 |
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4254 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
| 342 | 4255 double start_par = os::elapsedTime(); |
| 4256 if (ParallelGCThreads > 0) { | |
| 4257 // The individual threads will set their evac-failure closures. | |
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4258 StrongRootsScope srs(this); |
| 342 | 4259 workers()->run_task(&g1_par_task); |
| 4260 } else { | |
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4261 StrongRootsScope srs(this); |
| 342 | 4262 g1_par_task.work(0); |
| 4263 } | |
| 4264 | |
| 4265 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
| 4266 g1_policy()->record_par_time(par_time); | |
| 4267 set_par_threads(0); | |
| 4268 // Is this the right thing to do here? We don't save marks | |
| 4269 // on individual heap regions when we allocate from | |
| 4270 // them in parallel, so this seems like the correct place for this. | |
| 545 | 4271 retire_all_alloc_regions(); |
| 342 | 4272 { |
| 4273 G1IsAliveClosure is_alive(this); | |
| 4274 G1KeepAliveClosure keep_alive(this); | |
| 4275 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
| 4276 } | |
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4277 release_gc_alloc_regions(false /* totally */); |
| 342 | 4278 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); |
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4279 |
| 889 | 4280 concurrent_g1_refine()->clear_hot_cache(); |
| 342 | 4281 concurrent_g1_refine()->set_use_cache(true); |
| 4282 | |
| 4283 finalize_for_evac_failure(); | |
| 4284 | |
| 4285 // Must do this before removing self-forwarding pointers, which clears | |
| 4286 // the per-region evac-failure flags. | |
| 4287 concurrent_mark()->complete_marking_in_collection_set(); | |
| 4288 | |
| 4289 if (evacuation_failed()) { | |
| 4290 remove_self_forwarding_pointers(); | |
| 4291 if (PrintGCDetails) { | |
| 4292 gclog_or_tty->print(" (evacuation failed)"); | |
| 4293 } else if (PrintGC) { | |
| 4294 gclog_or_tty->print("--"); | |
| 4295 } | |
| 4296 } | |
| 4297 | |
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4298 if (G1DeferredRSUpdate) { |
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4299 RedirtyLoggedCardTableEntryFastClosure redirty; |
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4300 dirty_card_queue_set().set_closure(&redirty); |
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4301 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
| 1111 | 4302 |
| 4303 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
| 4304 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
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4305 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
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4306 } |
| 342 | 4307 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
| 4308 } | |
| 4309 | |
| 4310 void G1CollectedHeap::free_region(HeapRegion* hr) { | |
| 4311 size_t pre_used = 0; | |
| 4312 size_t cleared_h_regions = 0; | |
| 4313 size_t freed_regions = 0; | |
| 4314 UncleanRegionList local_list; | |
| 4315 | |
| 4316 HeapWord* start = hr->bottom(); | |
| 4317 HeapWord* end = hr->prev_top_at_mark_start(); | |
| 4318 size_t used_bytes = hr->used(); | |
| 4319 size_t live_bytes = hr->max_live_bytes(); | |
| 4320 if (used_bytes > 0) { | |
| 4321 guarantee( live_bytes <= used_bytes, "invariant" ); | |
| 4322 } else { | |
| 4323 guarantee( live_bytes == 0, "invariant" ); | |
| 4324 } | |
| 4325 | |
| 4326 size_t garbage_bytes = used_bytes - live_bytes; | |
| 4327 if (garbage_bytes > 0) | |
| 4328 g1_policy()->decrease_known_garbage_bytes(garbage_bytes); | |
| 4329 | |
| 4330 free_region_work(hr, pre_used, cleared_h_regions, freed_regions, | |
| 4331 &local_list); | |
| 4332 finish_free_region_work(pre_used, cleared_h_regions, freed_regions, | |
| 4333 &local_list); | |
| 4334 } | |
| 4335 | |
| 4336 void | |
| 4337 G1CollectedHeap::free_region_work(HeapRegion* hr, | |
| 4338 size_t& pre_used, | |
| 4339 size_t& cleared_h_regions, | |
| 4340 size_t& freed_regions, | |
| 4341 UncleanRegionList* list, | |
| 4342 bool par) { | |
| 4343 pre_used += hr->used(); | |
| 4344 if (hr->isHumongous()) { | |
| 4345 assert(hr->startsHumongous(), | |
| 4346 "Only the start of a humongous region should be freed."); | |
| 4347 int ind = _hrs->find(hr); | |
| 4348 assert(ind != -1, "Should have an index."); | |
| 4349 // Clear the start region. | |
| 4350 hr->hr_clear(par, true /*clear_space*/); | |
| 4351 list->insert_before_head(hr); | |
| 4352 cleared_h_regions++; | |
| 4353 freed_regions++; | |
| 4354 // Clear any continued regions. | |
| 4355 ind++; | |
| 4356 while ((size_t)ind < n_regions()) { | |
| 4357 HeapRegion* hrc = _hrs->at(ind); | |
| 4358 if (!hrc->continuesHumongous()) break; | |
| 4359 // Otherwise, does continue the H region. | |
| 4360 assert(hrc->humongous_start_region() == hr, "Huh?"); | |
| 4361 hrc->hr_clear(par, true /*clear_space*/); | |
| 4362 cleared_h_regions++; | |
| 4363 freed_regions++; | |
| 4364 list->insert_before_head(hrc); | |
| 4365 ind++; | |
| 4366 } | |
| 4367 } else { | |
| 4368 hr->hr_clear(par, true /*clear_space*/); | |
| 4369 list->insert_before_head(hr); | |
| 4370 freed_regions++; | |
| 4371 // If we're using clear2, this should not be enabled. | |
| 4372 // assert(!hr->in_cohort(), "Can't be both free and in a cohort."); | |
| 4373 } | |
| 4374 } | |
| 4375 | |
| 4376 void G1CollectedHeap::finish_free_region_work(size_t pre_used, | |
| 4377 size_t cleared_h_regions, | |
| 4378 size_t freed_regions, | |
| 4379 UncleanRegionList* list) { | |
| 4380 if (list != NULL && list->sz() > 0) { | |
| 4381 prepend_region_list_on_unclean_list(list); | |
| 4382 } | |
| 4383 // Acquire a lock, if we're parallel, to update possibly-shared | |
| 4384 // variables. | |
| 4385 Mutex* lock = (n_par_threads() > 0) ? ParGCRareEvent_lock : NULL; | |
| 4386 { | |
| 4387 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); | |
| 4388 _summary_bytes_used -= pre_used; | |
| 4389 _num_humongous_regions -= (int) cleared_h_regions; | |
| 4390 _free_regions += freed_regions; | |
| 4391 } | |
| 4392 } | |
| 4393 | |
| 4394 | |
| 4395 void G1CollectedHeap::dirtyCardsForYoungRegions(CardTableModRefBS* ct_bs, HeapRegion* list) { | |
| 4396 while (list != NULL) { | |
| 4397 guarantee( list->is_young(), "invariant" ); | |
| 4398 | |
| 4399 HeapWord* bottom = list->bottom(); | |
| 4400 HeapWord* end = list->end(); | |
| 4401 MemRegion mr(bottom, end); | |
| 4402 ct_bs->dirty(mr); | |
| 4403 | |
| 4404 list = list->get_next_young_region(); | |
| 4405 } | |
| 4406 } | |
| 4407 | |
|
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|
4408 |
|
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|
4409 class G1ParCleanupCTTask : public AbstractGangTask { |
|
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4410 CardTableModRefBS* _ct_bs; |
|
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4411 G1CollectedHeap* _g1h; |
|
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4412 HeapRegion* volatile _so_head; |
|
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4413 HeapRegion* volatile _su_head; |
|
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4414 public: |
|
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|
4415 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
|
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4416 G1CollectedHeap* g1h, |
|
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4417 HeapRegion* scan_only_list, |
|
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4418 HeapRegion* survivor_list) : |
|
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4419 AbstractGangTask("G1 Par Cleanup CT Task"), |
|
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4420 _ct_bs(ct_bs), |
|
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4421 _g1h(g1h), |
|
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4422 _so_head(scan_only_list), |
|
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4423 _su_head(survivor_list) |
|
796
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4424 { } |
|
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4425 |
|
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|
4426 void work(int i) { |
|
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4427 HeapRegion* r; |
|
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4428 while (r = _g1h->pop_dirty_cards_region()) { |
|
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|
4429 clear_cards(r); |
|
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|
4430 } |
|
940
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4431 // Redirty the cards of the scan-only and survivor regions. |
|
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|
4432 dirty_list(&this->_so_head); |
|
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4433 dirty_list(&this->_su_head); |
|
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4434 } |
|
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4435 |
|
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4436 void clear_cards(HeapRegion* r) { |
|
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4437 // Cards for Survivor and Scan-Only regions will be dirtied later. |
|
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4438 if (!r->is_scan_only() && !r->is_survivor()) { |
|
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4439 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
|
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4440 } |
|
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4441 } |
|
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4442 |
|
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4443 void dirty_list(HeapRegion* volatile * head_ptr) { |
|
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|
4444 HeapRegion* head; |
|
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|
4445 do { |
|
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|
4446 // Pop region off the list. |
|
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|
4447 head = *head_ptr; |
|
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|
4448 if (head != NULL) { |
|
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|
4449 HeapRegion* r = (HeapRegion*) |
|
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4450 Atomic::cmpxchg_ptr(head->get_next_young_region(), head_ptr, head); |
|
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4451 if (r == head) { |
|
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4452 assert(!r->isHumongous(), "Humongous regions shouldn't be on survivor list"); |
|
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4453 _ct_bs->dirty(MemRegion(r->bottom(), r->end())); |
|
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4454 } |
|
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4455 } |
|
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4456 } while (*head_ptr != NULL); |
|
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4457 } |
|
796
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|
4458 }; |
|
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4459 |
|
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4460 |
|
940
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|
4461 #ifndef PRODUCT |
|
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4462 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
|
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4463 CardTableModRefBS* _ct_bs; |
|
8624da129f0b
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4464 public: |
|
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|
4465 G1VerifyCardTableCleanup(CardTableModRefBS* ct_bs) |
|
8624da129f0b
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4466 : _ct_bs(ct_bs) |
|
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4467 { } |
|
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|
4468 virtual bool doHeapRegion(HeapRegion* r) |
|
8624da129f0b
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4469 { |
|
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4470 MemRegion mr(r->bottom(), r->end()); |
|
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4471 if (r->is_scan_only() || r->is_survivor()) { |
|
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4472 _ct_bs->verify_dirty_region(mr); |
|
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4473 } else { |
|
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|
4474 _ct_bs->verify_clean_region(mr); |
|
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|
4475 } |
|
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|
4476 return false; |
|
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|
4477 } |
|
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|
4478 }; |
|
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|
4479 #endif |
|
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|
4480 |
| 342 | 4481 void G1CollectedHeap::cleanUpCardTable() { |
| 4482 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
| 4483 double start = os::elapsedTime(); | |
| 4484 | |
|
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|
4485 // Iterate over the dirty cards region list. |
|
940
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4486 G1ParCleanupCTTask cleanup_task(ct_bs, this, |
|
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4487 _young_list->first_scan_only_region(), |
|
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4488 _young_list->first_survivor_region()); |
|
796
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4489 if (ParallelGCThreads > 0) { |
|
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4490 set_par_threads(workers()->total_workers()); |
|
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4491 workers()->run_task(&cleanup_task); |
|
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|
4492 set_par_threads(0); |
|
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4493 } else { |
|
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|
4494 while (_dirty_cards_region_list) { |
|
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|
4495 HeapRegion* r = _dirty_cards_region_list; |
|
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|
4496 cleanup_task.clear_cards(r); |
|
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4497 _dirty_cards_region_list = r->get_next_dirty_cards_region(); |
|
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4498 if (_dirty_cards_region_list == r) { |
|
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4499 // The last region. |
|
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4500 _dirty_cards_region_list = NULL; |
|
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4501 } |
|
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4502 r->set_next_dirty_cards_region(NULL); |
|
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4503 } |
|
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4504 // now, redirty the cards of the scan-only and survivor regions |
|
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4505 // (it seemed faster to do it this way, instead of iterating over |
|
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4506 // all regions and then clearing / dirtying as appropriate) |
|
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4507 dirtyCardsForYoungRegions(ct_bs, _young_list->first_scan_only_region()); |
|
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4508 dirtyCardsForYoungRegions(ct_bs, _young_list->first_survivor_region()); |
|
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4509 } |
| 342 | 4510 double elapsed = os::elapsedTime() - start; |
| 4511 g1_policy()->record_clear_ct_time( elapsed * 1000.0); | |
|
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|
4512 #ifndef PRODUCT |
|
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|
4513 if (G1VerifyCTCleanup || VerifyAfterGC) { |
|
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|
4514 G1VerifyCardTableCleanup cleanup_verifier(ct_bs); |
|
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|
4515 heap_region_iterate(&cleanup_verifier); |
|
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|
4516 } |
|
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|
4517 #endif |
| 342 | 4518 } |
| 4519 | |
| 4520 void G1CollectedHeap::do_collection_pause_if_appropriate(size_t word_size) { | |
| 4521 if (g1_policy()->should_do_collection_pause(word_size)) { | |
| 4522 do_collection_pause(); | |
| 4523 } | |
| 4524 } | |
| 4525 | |
| 4526 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
| 4527 double young_time_ms = 0.0; | |
| 4528 double non_young_time_ms = 0.0; | |
| 4529 | |
| 4530 G1CollectorPolicy* policy = g1_policy(); | |
| 4531 | |
| 4532 double start_sec = os::elapsedTime(); | |
| 4533 bool non_young = true; | |
| 4534 | |
| 4535 HeapRegion* cur = cs_head; | |
| 4536 int age_bound = -1; | |
| 4537 size_t rs_lengths = 0; | |
| 4538 | |
| 4539 while (cur != NULL) { | |
| 4540 if (non_young) { | |
| 4541 if (cur->is_young()) { | |
| 4542 double end_sec = os::elapsedTime(); | |
| 4543 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 4544 non_young_time_ms += elapsed_ms; | |
| 4545 | |
| 4546 start_sec = os::elapsedTime(); | |
| 4547 non_young = false; | |
| 4548 } | |
| 4549 } else { | |
| 4550 if (!cur->is_on_free_list()) { | |
| 4551 double end_sec = os::elapsedTime(); | |
| 4552 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 4553 young_time_ms += elapsed_ms; | |
| 4554 | |
| 4555 start_sec = os::elapsedTime(); | |
| 4556 non_young = true; | |
| 4557 } | |
| 4558 } | |
| 4559 | |
| 4560 rs_lengths += cur->rem_set()->occupied(); | |
| 4561 | |
| 4562 HeapRegion* next = cur->next_in_collection_set(); | |
| 4563 assert(cur->in_collection_set(), "bad CS"); | |
| 4564 cur->set_next_in_collection_set(NULL); | |
| 4565 cur->set_in_collection_set(false); | |
| 4566 | |
| 4567 if (cur->is_young()) { | |
| 4568 int index = cur->young_index_in_cset(); | |
| 4569 guarantee( index != -1, "invariant" ); | |
| 4570 guarantee( (size_t)index < policy->young_cset_length(), "invariant" ); | |
| 4571 size_t words_survived = _surviving_young_words[index]; | |
| 4572 cur->record_surv_words_in_group(words_survived); | |
| 4573 } else { | |
| 4574 int index = cur->young_index_in_cset(); | |
| 4575 guarantee( index == -1, "invariant" ); | |
| 4576 } | |
| 4577 | |
| 4578 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
| 4579 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
| 4580 "invariant" ); | |
| 4581 | |
| 4582 if (!cur->evacuation_failed()) { | |
| 4583 // And the region is empty. | |
| 4584 assert(!cur->is_empty(), | |
| 4585 "Should not have empty regions in a CS."); | |
| 4586 free_region(cur); | |
| 4587 } else { | |
| 4588 guarantee( !cur->is_scan_only(), "should not be scan only" ); | |
| 4589 cur->uninstall_surv_rate_group(); | |
| 4590 if (cur->is_young()) | |
| 4591 cur->set_young_index_in_cset(-1); | |
| 4592 cur->set_not_young(); | |
| 4593 cur->set_evacuation_failed(false); | |
| 4594 } | |
| 4595 cur = next; | |
| 4596 } | |
| 4597 | |
| 4598 policy->record_max_rs_lengths(rs_lengths); | |
| 4599 policy->cset_regions_freed(); | |
| 4600 | |
| 4601 double end_sec = os::elapsedTime(); | |
| 4602 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 4603 if (non_young) | |
| 4604 non_young_time_ms += elapsed_ms; | |
| 4605 else | |
| 4606 young_time_ms += elapsed_ms; | |
| 4607 | |
| 4608 policy->record_young_free_cset_time_ms(young_time_ms); | |
| 4609 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
| 4610 } | |
| 4611 | |
| 4612 HeapRegion* | |
| 4613 G1CollectedHeap::alloc_region_from_unclean_list_locked(bool zero_filled) { | |
| 4614 assert(ZF_mon->owned_by_self(), "Precondition"); | |
| 4615 HeapRegion* res = pop_unclean_region_list_locked(); | |
| 4616 if (res != NULL) { | |
| 4617 assert(!res->continuesHumongous() && | |
| 4618 res->zero_fill_state() != HeapRegion::Allocated, | |
| 4619 "Only free regions on unclean list."); | |
| 4620 if (zero_filled) { | |
| 4621 res->ensure_zero_filled_locked(); | |
| 4622 res->set_zero_fill_allocated(); | |
| 4623 } | |
| 4624 } | |
| 4625 return res; | |
| 4626 } | |
| 4627 | |
| 4628 HeapRegion* G1CollectedHeap::alloc_region_from_unclean_list(bool zero_filled) { | |
| 4629 MutexLockerEx zx(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4630 return alloc_region_from_unclean_list_locked(zero_filled); | |
| 4631 } | |
| 4632 | |
| 4633 void G1CollectedHeap::put_region_on_unclean_list(HeapRegion* r) { | |
| 4634 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4635 put_region_on_unclean_list_locked(r); | |
| 4636 if (should_zf()) ZF_mon->notify_all(); // Wake up ZF thread. | |
| 4637 } | |
| 4638 | |
| 4639 void G1CollectedHeap::set_unclean_regions_coming(bool b) { | |
| 4640 MutexLockerEx x(Cleanup_mon); | |
| 4641 set_unclean_regions_coming_locked(b); | |
| 4642 } | |
| 4643 | |
| 4644 void G1CollectedHeap::set_unclean_regions_coming_locked(bool b) { | |
| 4645 assert(Cleanup_mon->owned_by_self(), "Precondition"); | |
| 4646 _unclean_regions_coming = b; | |
| 4647 // Wake up mutator threads that might be waiting for completeCleanup to | |
| 4648 // finish. | |
| 4649 if (!b) Cleanup_mon->notify_all(); | |
| 4650 } | |
| 4651 | |
| 4652 void G1CollectedHeap::wait_for_cleanup_complete() { | |
| 4653 MutexLockerEx x(Cleanup_mon); | |
| 4654 wait_for_cleanup_complete_locked(); | |
| 4655 } | |
| 4656 | |
| 4657 void G1CollectedHeap::wait_for_cleanup_complete_locked() { | |
| 4658 assert(Cleanup_mon->owned_by_self(), "precondition"); | |
| 4659 while (_unclean_regions_coming) { | |
| 4660 Cleanup_mon->wait(); | |
| 4661 } | |
| 4662 } | |
| 4663 | |
| 4664 void | |
| 4665 G1CollectedHeap::put_region_on_unclean_list_locked(HeapRegion* r) { | |
| 4666 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4667 _unclean_region_list.insert_before_head(r); | |
| 4668 } | |
| 4669 | |
| 4670 void | |
| 4671 G1CollectedHeap::prepend_region_list_on_unclean_list(UncleanRegionList* list) { | |
| 4672 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4673 prepend_region_list_on_unclean_list_locked(list); | |
| 4674 if (should_zf()) ZF_mon->notify_all(); // Wake up ZF thread. | |
| 4675 } | |
| 4676 | |
| 4677 void | |
| 4678 G1CollectedHeap:: | |
| 4679 prepend_region_list_on_unclean_list_locked(UncleanRegionList* list) { | |
| 4680 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4681 _unclean_region_list.prepend_list(list); | |
| 4682 } | |
| 4683 | |
| 4684 HeapRegion* G1CollectedHeap::pop_unclean_region_list_locked() { | |
| 4685 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4686 HeapRegion* res = _unclean_region_list.pop(); | |
| 4687 if (res != NULL) { | |
| 4688 // Inform ZF thread that there's a new unclean head. | |
| 4689 if (_unclean_region_list.hd() != NULL && should_zf()) | |
| 4690 ZF_mon->notify_all(); | |
| 4691 } | |
| 4692 return res; | |
| 4693 } | |
| 4694 | |
| 4695 HeapRegion* G1CollectedHeap::peek_unclean_region_list_locked() { | |
| 4696 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4697 return _unclean_region_list.hd(); | |
| 4698 } | |
| 4699 | |
| 4700 | |
| 4701 bool G1CollectedHeap::move_cleaned_region_to_free_list_locked() { | |
| 4702 assert(ZF_mon->owned_by_self(), "Precondition"); | |
| 4703 HeapRegion* r = peek_unclean_region_list_locked(); | |
| 4704 if (r != NULL && r->zero_fill_state() == HeapRegion::ZeroFilled) { | |
| 4705 // Result of below must be equal to "r", since we hold the lock. | |
| 4706 (void)pop_unclean_region_list_locked(); | |
| 4707 put_free_region_on_list_locked(r); | |
| 4708 return true; | |
| 4709 } else { | |
| 4710 return false; | |
| 4711 } | |
| 4712 } | |
| 4713 | |
| 4714 bool G1CollectedHeap::move_cleaned_region_to_free_list() { | |
| 4715 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4716 return move_cleaned_region_to_free_list_locked(); | |
| 4717 } | |
| 4718 | |
| 4719 | |
| 4720 void G1CollectedHeap::put_free_region_on_list_locked(HeapRegion* r) { | |
| 4721 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4722 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4723 assert(r->zero_fill_state() == HeapRegion::ZeroFilled, | |
| 4724 "Regions on free list must be zero filled"); | |
| 4725 assert(!r->isHumongous(), "Must not be humongous."); | |
| 4726 assert(r->is_empty(), "Better be empty"); | |
| 4727 assert(!r->is_on_free_list(), | |
| 4728 "Better not already be on free list"); | |
| 4729 assert(!r->is_on_unclean_list(), | |
| 4730 "Better not already be on unclean list"); | |
| 4731 r->set_on_free_list(true); | |
| 4732 r->set_next_on_free_list(_free_region_list); | |
| 4733 _free_region_list = r; | |
| 4734 _free_region_list_size++; | |
| 4735 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4736 } | |
| 4737 | |
| 4738 void G1CollectedHeap::put_free_region_on_list(HeapRegion* r) { | |
| 4739 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4740 put_free_region_on_list_locked(r); | |
| 4741 } | |
| 4742 | |
| 4743 HeapRegion* G1CollectedHeap::pop_free_region_list_locked() { | |
| 4744 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4745 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4746 HeapRegion* res = _free_region_list; | |
| 4747 if (res != NULL) { | |
| 4748 _free_region_list = res->next_from_free_list(); | |
| 4749 _free_region_list_size--; | |
| 4750 res->set_on_free_list(false); | |
| 4751 res->set_next_on_free_list(NULL); | |
| 4752 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4753 } | |
| 4754 return res; | |
| 4755 } | |
| 4756 | |
| 4757 | |
| 4758 HeapRegion* G1CollectedHeap::alloc_free_region_from_lists(bool zero_filled) { | |
| 4759 // By self, or on behalf of self. | |
| 4760 assert(Heap_lock->is_locked(), "Precondition"); | |
| 4761 HeapRegion* res = NULL; | |
| 4762 bool first = true; | |
| 4763 while (res == NULL) { | |
| 4764 if (zero_filled || !first) { | |
| 4765 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4766 res = pop_free_region_list_locked(); | |
| 4767 if (res != NULL) { | |
| 4768 assert(!res->zero_fill_is_allocated(), | |
| 4769 "No allocated regions on free list."); | |
| 4770 res->set_zero_fill_allocated(); | |
| 4771 } else if (!first) { | |
| 4772 break; // We tried both, time to return NULL. | |
| 4773 } | |
| 4774 } | |
| 4775 | |
| 4776 if (res == NULL) { | |
| 4777 res = alloc_region_from_unclean_list(zero_filled); | |
| 4778 } | |
| 4779 assert(res == NULL || | |
| 4780 !zero_filled || | |
| 4781 res->zero_fill_is_allocated(), | |
| 4782 "We must have allocated the region we're returning"); | |
| 4783 first = false; | |
| 4784 } | |
| 4785 return res; | |
| 4786 } | |
| 4787 | |
| 4788 void G1CollectedHeap::remove_allocated_regions_from_lists() { | |
| 4789 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4790 { | |
| 4791 HeapRegion* prev = NULL; | |
| 4792 HeapRegion* cur = _unclean_region_list.hd(); | |
| 4793 while (cur != NULL) { | |
| 4794 HeapRegion* next = cur->next_from_unclean_list(); | |
| 4795 if (cur->zero_fill_is_allocated()) { | |
| 4796 // Remove from the list. | |
| 4797 if (prev == NULL) { | |
| 4798 (void)_unclean_region_list.pop(); | |
| 4799 } else { | |
| 4800 _unclean_region_list.delete_after(prev); | |
| 4801 } | |
| 4802 cur->set_on_unclean_list(false); | |
| 4803 cur->set_next_on_unclean_list(NULL); | |
| 4804 } else { | |
| 4805 prev = cur; | |
| 4806 } | |
| 4807 cur = next; | |
| 4808 } | |
| 4809 assert(_unclean_region_list.sz() == unclean_region_list_length(), | |
| 4810 "Inv"); | |
| 4811 } | |
| 4812 | |
| 4813 { | |
| 4814 HeapRegion* prev = NULL; | |
| 4815 HeapRegion* cur = _free_region_list; | |
| 4816 while (cur != NULL) { | |
| 4817 HeapRegion* next = cur->next_from_free_list(); | |
| 4818 if (cur->zero_fill_is_allocated()) { | |
| 4819 // Remove from the list. | |
| 4820 if (prev == NULL) { | |
| 4821 _free_region_list = cur->next_from_free_list(); | |
| 4822 } else { | |
| 4823 prev->set_next_on_free_list(cur->next_from_free_list()); | |
| 4824 } | |
| 4825 cur->set_on_free_list(false); | |
| 4826 cur->set_next_on_free_list(NULL); | |
| 4827 _free_region_list_size--; | |
| 4828 } else { | |
| 4829 prev = cur; | |
| 4830 } | |
| 4831 cur = next; | |
| 4832 } | |
| 4833 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4834 } | |
| 4835 } | |
| 4836 | |
| 4837 bool G1CollectedHeap::verify_region_lists() { | |
| 4838 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4839 return verify_region_lists_locked(); | |
| 4840 } | |
| 4841 | |
| 4842 bool G1CollectedHeap::verify_region_lists_locked() { | |
| 4843 HeapRegion* unclean = _unclean_region_list.hd(); | |
| 4844 while (unclean != NULL) { | |
| 4845 guarantee(unclean->is_on_unclean_list(), "Well, it is!"); | |
| 4846 guarantee(!unclean->is_on_free_list(), "Well, it shouldn't be!"); | |
| 4847 guarantee(unclean->zero_fill_state() != HeapRegion::Allocated, | |
| 4848 "Everything else is possible."); | |
| 4849 unclean = unclean->next_from_unclean_list(); | |
| 4850 } | |
| 4851 guarantee(_unclean_region_list.sz() == unclean_region_list_length(), "Inv"); | |
| 4852 | |
| 4853 HeapRegion* free_r = _free_region_list; | |
| 4854 while (free_r != NULL) { | |
| 4855 assert(free_r->is_on_free_list(), "Well, it is!"); | |
| 4856 assert(!free_r->is_on_unclean_list(), "Well, it shouldn't be!"); | |
| 4857 switch (free_r->zero_fill_state()) { | |
| 4858 case HeapRegion::NotZeroFilled: | |
| 4859 case HeapRegion::ZeroFilling: | |
| 4860 guarantee(false, "Should not be on free list."); | |
| 4861 break; | |
| 4862 default: | |
| 4863 // Everything else is possible. | |
| 4864 break; | |
| 4865 } | |
| 4866 free_r = free_r->next_from_free_list(); | |
| 4867 } | |
| 4868 guarantee(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4869 // If we didn't do an assertion... | |
| 4870 return true; | |
| 4871 } | |
| 4872 | |
| 4873 size_t G1CollectedHeap::free_region_list_length() { | |
| 4874 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4875 size_t len = 0; | |
| 4876 HeapRegion* cur = _free_region_list; | |
| 4877 while (cur != NULL) { | |
| 4878 len++; | |
| 4879 cur = cur->next_from_free_list(); | |
| 4880 } | |
| 4881 return len; | |
| 4882 } | |
| 4883 | |
| 4884 size_t G1CollectedHeap::unclean_region_list_length() { | |
| 4885 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4886 return _unclean_region_list.length(); | |
| 4887 } | |
| 4888 | |
| 4889 size_t G1CollectedHeap::n_regions() { | |
| 4890 return _hrs->length(); | |
| 4891 } | |
| 4892 | |
| 4893 size_t G1CollectedHeap::max_regions() { | |
| 4894 return | |
| 4895 (size_t)align_size_up(g1_reserved_obj_bytes(), HeapRegion::GrainBytes) / | |
| 4896 HeapRegion::GrainBytes; | |
| 4897 } | |
| 4898 | |
| 4899 size_t G1CollectedHeap::free_regions() { | |
| 4900 /* Possibly-expensive assert. | |
| 4901 assert(_free_regions == count_free_regions(), | |
| 4902 "_free_regions is off."); | |
| 4903 */ | |
| 4904 return _free_regions; | |
| 4905 } | |
| 4906 | |
| 4907 bool G1CollectedHeap::should_zf() { | |
| 4908 return _free_region_list_size < (size_t) G1ConcZFMaxRegions; | |
| 4909 } | |
| 4910 | |
| 4911 class RegionCounter: public HeapRegionClosure { | |
| 4912 size_t _n; | |
| 4913 public: | |
| 4914 RegionCounter() : _n(0) {} | |
| 4915 bool doHeapRegion(HeapRegion* r) { | |
| 677 | 4916 if (r->is_empty()) { |
| 342 | 4917 assert(!r->isHumongous(), "H regions should not be empty."); |
| 4918 _n++; | |
| 4919 } | |
| 4920 return false; | |
| 4921 } | |
| 4922 int res() { return (int) _n; } | |
| 4923 }; | |
| 4924 | |
| 4925 size_t G1CollectedHeap::count_free_regions() { | |
| 4926 RegionCounter rc; | |
| 4927 heap_region_iterate(&rc); | |
| 4928 size_t n = rc.res(); | |
| 4929 if (_cur_alloc_region != NULL && _cur_alloc_region->is_empty()) | |
| 4930 n--; | |
| 4931 return n; | |
| 4932 } | |
| 4933 | |
| 4934 size_t G1CollectedHeap::count_free_regions_list() { | |
| 4935 size_t n = 0; | |
| 4936 size_t o = 0; | |
| 4937 ZF_mon->lock_without_safepoint_check(); | |
| 4938 HeapRegion* cur = _free_region_list; | |
| 4939 while (cur != NULL) { | |
| 4940 cur = cur->next_from_free_list(); | |
| 4941 n++; | |
| 4942 } | |
| 4943 size_t m = unclean_region_list_length(); | |
| 4944 ZF_mon->unlock(); | |
| 4945 return n + m; | |
| 4946 } | |
| 4947 | |
| 4948 bool G1CollectedHeap::should_set_young_locked() { | |
| 4949 assert(heap_lock_held_for_gc(), | |
| 4950 "the heap lock should already be held by or for this thread"); | |
| 4951 return (g1_policy()->in_young_gc_mode() && | |
| 4952 g1_policy()->should_add_next_region_to_young_list()); | |
| 4953 } | |
| 4954 | |
| 4955 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
| 4956 assert(heap_lock_held_for_gc(), | |
| 4957 "the heap lock should already be held by or for this thread"); | |
| 4958 _young_list->push_region(hr); | |
| 4959 g1_policy()->set_region_short_lived(hr); | |
| 4960 } | |
| 4961 | |
| 4962 class NoYoungRegionsClosure: public HeapRegionClosure { | |
| 4963 private: | |
| 4964 bool _success; | |
| 4965 public: | |
| 4966 NoYoungRegionsClosure() : _success(true) { } | |
| 4967 bool doHeapRegion(HeapRegion* r) { | |
| 4968 if (r->is_young()) { | |
| 4969 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
| 4970 r->bottom(), r->end()); | |
| 4971 _success = false; | |
| 4972 } | |
| 4973 return false; | |
| 4974 } | |
| 4975 bool success() { return _success; } | |
| 4976 }; | |
| 4977 | |
| 4978 bool G1CollectedHeap::check_young_list_empty(bool ignore_scan_only_list, | |
| 4979 bool check_sample) { | |
| 4980 bool ret = true; | |
| 4981 | |
| 4982 ret = _young_list->check_list_empty(ignore_scan_only_list, check_sample); | |
| 4983 if (!ignore_scan_only_list) { | |
| 4984 NoYoungRegionsClosure closure; | |
| 4985 heap_region_iterate(&closure); | |
| 4986 ret = ret && closure.success(); | |
| 4987 } | |
| 4988 | |
| 4989 return ret; | |
| 4990 } | |
| 4991 | |
| 4992 void G1CollectedHeap::empty_young_list() { | |
| 4993 assert(heap_lock_held_for_gc(), | |
| 4994 "the heap lock should already be held by or for this thread"); | |
| 4995 assert(g1_policy()->in_young_gc_mode(), "should be in young GC mode"); | |
| 4996 | |
| 4997 _young_list->empty_list(); | |
| 4998 } | |
| 4999 | |
| 5000 bool G1CollectedHeap::all_alloc_regions_no_allocs_since_save_marks() { | |
| 5001 bool no_allocs = true; | |
| 5002 for (int ap = 0; ap < GCAllocPurposeCount && no_allocs; ++ap) { | |
| 5003 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 5004 no_allocs = r == NULL || r->saved_mark_at_top(); | |
| 5005 } | |
| 5006 return no_allocs; | |
| 5007 } | |
| 5008 | |
| 545 | 5009 void G1CollectedHeap::retire_all_alloc_regions() { |
| 342 | 5010 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
| 5011 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 5012 if (r != NULL) { | |
| 5013 // Check for aliases. | |
| 5014 bool has_processed_alias = false; | |
| 5015 for (int i = 0; i < ap; ++i) { | |
| 5016 if (_gc_alloc_regions[i] == r) { | |
| 5017 has_processed_alias = true; | |
| 5018 break; | |
| 5019 } | |
| 5020 } | |
| 5021 if (!has_processed_alias) { | |
| 545 | 5022 retire_alloc_region(r, false /* par */); |
| 342 | 5023 } |
| 5024 } | |
| 5025 } | |
| 5026 } | |
| 5027 | |
| 5028 | |
| 5029 // Done at the start of full GC. | |
| 5030 void G1CollectedHeap::tear_down_region_lists() { | |
| 5031 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5032 while (pop_unclean_region_list_locked() != NULL) ; | |
| 5033 assert(_unclean_region_list.hd() == NULL && _unclean_region_list.sz() == 0, | |
| 5034 "Postconditions of loop.") | |
| 5035 while (pop_free_region_list_locked() != NULL) ; | |
| 5036 assert(_free_region_list == NULL, "Postcondition of loop."); | |
| 5037 if (_free_region_list_size != 0) { | |
| 5038 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
|
5039 print_on(gclog_or_tty, true /* extended */); |
| 342 | 5040 } |
| 5041 assert(_free_region_list_size == 0, "Postconditions of loop."); | |
| 5042 } | |
| 5043 | |
| 5044 | |
| 5045 class RegionResetter: public HeapRegionClosure { | |
| 5046 G1CollectedHeap* _g1; | |
| 5047 int _n; | |
| 5048 public: | |
| 5049 RegionResetter() : _g1(G1CollectedHeap::heap()), _n(0) {} | |
| 5050 bool doHeapRegion(HeapRegion* r) { | |
| 5051 if (r->continuesHumongous()) return false; | |
| 5052 if (r->top() > r->bottom()) { | |
| 5053 if (r->top() < r->end()) { | |
| 5054 Copy::fill_to_words(r->top(), | |
| 5055 pointer_delta(r->end(), r->top())); | |
| 5056 } | |
| 5057 r->set_zero_fill_allocated(); | |
| 5058 } else { | |
| 5059 assert(r->is_empty(), "tautology"); | |
| 677 | 5060 _n++; |
| 5061 switch (r->zero_fill_state()) { | |
| 342 | 5062 case HeapRegion::NotZeroFilled: |
| 5063 case HeapRegion::ZeroFilling: | |
| 5064 _g1->put_region_on_unclean_list_locked(r); | |
| 5065 break; | |
| 5066 case HeapRegion::Allocated: | |
| 5067 r->set_zero_fill_complete(); | |
| 5068 // no break; go on to put on free list. | |
| 5069 case HeapRegion::ZeroFilled: | |
| 5070 _g1->put_free_region_on_list_locked(r); | |
| 5071 break; | |
| 5072 } | |
| 5073 } | |
| 5074 return false; | |
| 5075 } | |
| 5076 | |
| 5077 int getFreeRegionCount() {return _n;} | |
| 5078 }; | |
| 5079 | |
| 5080 // Done at the end of full GC. | |
| 5081 void G1CollectedHeap::rebuild_region_lists() { | |
| 5082 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5083 // This needs to go at the end of the full GC. | |
| 5084 RegionResetter rs; | |
| 5085 heap_region_iterate(&rs); | |
| 5086 _free_regions = rs.getFreeRegionCount(); | |
| 5087 // Tell the ZF thread it may have work to do. | |
| 5088 if (should_zf()) ZF_mon->notify_all(); | |
| 5089 } | |
| 5090 | |
| 5091 class UsedRegionsNeedZeroFillSetter: public HeapRegionClosure { | |
| 5092 G1CollectedHeap* _g1; | |
| 5093 int _n; | |
| 5094 public: | |
| 5095 UsedRegionsNeedZeroFillSetter() : _g1(G1CollectedHeap::heap()), _n(0) {} | |
| 5096 bool doHeapRegion(HeapRegion* r) { | |
| 5097 if (r->continuesHumongous()) return false; | |
| 5098 if (r->top() > r->bottom()) { | |
| 5099 // There are assertions in "set_zero_fill_needed()" below that | |
| 5100 // require top() == bottom(), so this is technically illegal. | |
| 5101 // We'll skirt the law here, by making that true temporarily. | |
| 5102 DEBUG_ONLY(HeapWord* save_top = r->top(); | |
| 5103 r->set_top(r->bottom())); | |
| 5104 r->set_zero_fill_needed(); | |
| 5105 DEBUG_ONLY(r->set_top(save_top)); | |
| 5106 } | |
| 5107 return false; | |
| 5108 } | |
| 5109 }; | |
| 5110 | |
| 5111 // Done at the start of full GC. | |
| 5112 void G1CollectedHeap::set_used_regions_to_need_zero_fill() { | |
| 5113 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5114 // This needs to go at the end of the full GC. | |
| 5115 UsedRegionsNeedZeroFillSetter rs; | |
| 5116 heap_region_iterate(&rs); | |
| 5117 } | |
| 5118 | |
| 5119 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
| 5120 _refine_cte_cl->set_concurrent(concurrent); | |
| 5121 } | |
| 5122 | |
| 5123 #ifndef PRODUCT | |
| 5124 | |
| 5125 class PrintHeapRegionClosure: public HeapRegionClosure { | |
| 5126 public: | |
| 5127 bool doHeapRegion(HeapRegion *r) { | |
| 5128 gclog_or_tty->print("Region: "PTR_FORMAT":", r); | |
| 5129 if (r != NULL) { | |
| 5130 if (r->is_on_free_list()) | |
| 5131 gclog_or_tty->print("Free "); | |
| 5132 if (r->is_young()) | |
| 5133 gclog_or_tty->print("Young "); | |
| 5134 if (r->isHumongous()) | |
| 5135 gclog_or_tty->print("Is Humongous "); | |
| 5136 r->print(); | |
| 5137 } | |
| 5138 return false; | |
| 5139 } | |
| 5140 }; | |
| 5141 | |
| 5142 class SortHeapRegionClosure : public HeapRegionClosure { | |
| 5143 size_t young_regions,free_regions, unclean_regions; | |
| 5144 size_t hum_regions, count; | |
| 5145 size_t unaccounted, cur_unclean, cur_alloc; | |
| 5146 size_t total_free; | |
| 5147 HeapRegion* cur; | |
| 5148 public: | |
| 5149 SortHeapRegionClosure(HeapRegion *_cur) : cur(_cur), young_regions(0), | |
| 5150 free_regions(0), unclean_regions(0), | |
| 5151 hum_regions(0), | |
| 5152 count(0), unaccounted(0), | |
| 5153 cur_alloc(0), total_free(0) | |
| 5154 {} | |
| 5155 bool doHeapRegion(HeapRegion *r) { | |
| 5156 count++; | |
| 5157 if (r->is_on_free_list()) free_regions++; | |
| 5158 else if (r->is_on_unclean_list()) unclean_regions++; | |
| 5159 else if (r->isHumongous()) hum_regions++; | |
| 5160 else if (r->is_young()) young_regions++; | |
| 5161 else if (r == cur) cur_alloc++; | |
| 5162 else unaccounted++; | |
| 5163 return false; | |
| 5164 } | |
| 5165 void print() { | |
| 5166 total_free = free_regions + unclean_regions; | |
| 5167 gclog_or_tty->print("%d regions\n", count); | |
| 5168 gclog_or_tty->print("%d free: free_list = %d unclean = %d\n", | |
| 5169 total_free, free_regions, unclean_regions); | |
| 5170 gclog_or_tty->print("%d humongous %d young\n", | |
| 5171 hum_regions, young_regions); | |
| 5172 gclog_or_tty->print("%d cur_alloc\n", cur_alloc); | |
| 5173 gclog_or_tty->print("UHOH unaccounted = %d\n", unaccounted); | |
| 5174 } | |
| 5175 }; | |
| 5176 | |
| 5177 void G1CollectedHeap::print_region_counts() { | |
| 5178 SortHeapRegionClosure sc(_cur_alloc_region); | |
| 5179 PrintHeapRegionClosure cl; | |
| 5180 heap_region_iterate(&cl); | |
| 5181 heap_region_iterate(&sc); | |
| 5182 sc.print(); | |
| 5183 print_region_accounting_info(); | |
| 5184 }; | |
| 5185 | |
| 5186 bool G1CollectedHeap::regions_accounted_for() { | |
| 5187 // TODO: regions accounting for young/survivor/tenured | |
| 5188 return true; | |
| 5189 } | |
| 5190 | |
| 5191 bool G1CollectedHeap::print_region_accounting_info() { | |
| 5192 gclog_or_tty->print_cr("Free regions: %d (count: %d count list %d) (clean: %d unclean: %d).", | |
| 5193 free_regions(), | |
| 5194 count_free_regions(), count_free_regions_list(), | |
| 5195 _free_region_list_size, _unclean_region_list.sz()); | |
| 5196 gclog_or_tty->print_cr("cur_alloc: %d.", | |
| 5197 (_cur_alloc_region == NULL ? 0 : 1)); | |
| 5198 gclog_or_tty->print_cr("H regions: %d.", _num_humongous_regions); | |
| 5199 | |
| 5200 // TODO: check regions accounting for young/survivor/tenured | |
| 5201 return true; | |
| 5202 } | |
| 5203 | |
| 5204 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
| 5205 HeapRegion* hr = heap_region_containing(p); | |
| 5206 if (hr == NULL) { | |
| 5207 return is_in_permanent(p); | |
| 5208 } else { | |
| 5209 return hr->is_in(p); | |
| 5210 } | |
| 5211 } | |
| 941 | 5212 #endif // !PRODUCT |
| 342 | 5213 |
| 5214 void G1CollectedHeap::g1_unimplemented() { | |
| 5215 // Unimplemented(); | |
| 5216 } |