Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 619:7ea5ca260b28
6814467: G1: small fixes related to concurrent marking verboseness
Summary: A few small fixes to remove some inconsistencies in the concurrent mark-related verbose GC output.
Reviewed-by: jmasa
| author | tonyp |
|---|---|
| date | Sat, 07 Mar 2009 11:07:37 -0500 |
| parents | ae1579717a57 |
| children | bcedf688d882 |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 470 | 2 * Copyright 2001-2008 Sun Microsystems, Inc. All Rights Reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #include "incls/_precompiled.incl" | |
| 26 #include "incls/_g1CollectedHeap.cpp.incl" | |
| 27 | |
| 28 // turn it on so that the contents of the young list (scan-only / | |
| 29 // to-be-collected) are printed at "strategic" points before / during | |
| 30 // / after the collection --- this is useful for debugging | |
| 31 #define SCAN_ONLY_VERBOSE 0 | |
| 32 // CURRENT STATUS | |
| 33 // This file is under construction. Search for "FIXME". | |
| 34 | |
| 35 // INVARIANTS/NOTES | |
| 36 // | |
| 37 // All allocation activity covered by the G1CollectedHeap interface is | |
| 38 // serialized by acquiring the HeapLock. This happens in | |
| 39 // mem_allocate_work, which all such allocation functions call. | |
| 40 // (Note that this does not apply to TLAB allocation, which is not part | |
| 41 // of this interface: it is done by clients of this interface.) | |
| 42 | |
| 43 // Local to this file. | |
| 44 | |
| 45 // Finds the first HeapRegion. | |
| 46 // No longer used, but might be handy someday. | |
| 47 | |
| 48 class FindFirstRegionClosure: public HeapRegionClosure { | |
| 49 HeapRegion* _a_region; | |
| 50 public: | |
| 51 FindFirstRegionClosure() : _a_region(NULL) {} | |
| 52 bool doHeapRegion(HeapRegion* r) { | |
| 53 _a_region = r; | |
| 54 return true; | |
| 55 } | |
| 56 HeapRegion* result() { return _a_region; } | |
| 57 }; | |
| 58 | |
| 59 | |
| 60 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
| 61 SuspendibleThreadSet* _sts; | |
| 62 G1RemSet* _g1rs; | |
| 63 ConcurrentG1Refine* _cg1r; | |
| 64 bool _concurrent; | |
| 65 public: | |
| 66 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
| 67 G1RemSet* g1rs, | |
| 68 ConcurrentG1Refine* cg1r) : | |
| 69 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
| 70 {} | |
| 71 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 72 _g1rs->concurrentRefineOneCard(card_ptr, worker_i); | |
| 73 if (_concurrent && _sts->should_yield()) { | |
| 74 // Caller will actually yield. | |
| 75 return false; | |
| 76 } | |
| 77 // Otherwise, we finished successfully; return true. | |
| 78 return true; | |
| 79 } | |
| 80 void set_concurrent(bool b) { _concurrent = b; } | |
| 81 }; | |
| 82 | |
| 83 | |
| 84 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 85 int _calls; | |
| 86 G1CollectedHeap* _g1h; | |
| 87 CardTableModRefBS* _ctbs; | |
| 88 int _histo[256]; | |
| 89 public: | |
| 90 ClearLoggedCardTableEntryClosure() : | |
| 91 _calls(0) | |
| 92 { | |
| 93 _g1h = G1CollectedHeap::heap(); | |
| 94 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 95 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
| 96 } | |
| 97 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 98 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 99 _calls++; | |
| 100 unsigned char* ujb = (unsigned char*)card_ptr; | |
| 101 int ind = (int)(*ujb); | |
| 102 _histo[ind]++; | |
| 103 *card_ptr = -1; | |
| 104 } | |
| 105 return true; | |
| 106 } | |
| 107 int calls() { return _calls; } | |
| 108 void print_histo() { | |
| 109 gclog_or_tty->print_cr("Card table value histogram:"); | |
| 110 for (int i = 0; i < 256; i++) { | |
| 111 if (_histo[i] != 0) { | |
| 112 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
| 113 } | |
| 114 } | |
| 115 } | |
| 116 }; | |
| 117 | |
| 118 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 119 int _calls; | |
| 120 G1CollectedHeap* _g1h; | |
| 121 CardTableModRefBS* _ctbs; | |
| 122 public: | |
| 123 RedirtyLoggedCardTableEntryClosure() : | |
| 124 _calls(0) | |
| 125 { | |
| 126 _g1h = G1CollectedHeap::heap(); | |
| 127 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 128 } | |
| 129 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 130 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 131 _calls++; | |
| 132 *card_ptr = 0; | |
| 133 } | |
| 134 return true; | |
| 135 } | |
| 136 int calls() { return _calls; } | |
| 137 }; | |
| 138 | |
|
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139 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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140 public: |
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141 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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142 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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143 return true; |
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144 } |
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145 }; |
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146 |
| 342 | 147 YoungList::YoungList(G1CollectedHeap* g1h) |
| 148 : _g1h(g1h), _head(NULL), | |
| 149 _scan_only_head(NULL), _scan_only_tail(NULL), _curr_scan_only(NULL), | |
| 150 _length(0), _scan_only_length(0), | |
| 151 _last_sampled_rs_lengths(0), | |
| 545 | 152 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) |
| 342 | 153 { |
| 154 guarantee( check_list_empty(false), "just making sure..." ); | |
| 155 } | |
| 156 | |
| 157 void YoungList::push_region(HeapRegion *hr) { | |
| 158 assert(!hr->is_young(), "should not already be young"); | |
| 159 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
| 160 | |
| 161 hr->set_next_young_region(_head); | |
| 162 _head = hr; | |
| 163 | |
| 164 hr->set_young(); | |
| 165 double yg_surv_rate = _g1h->g1_policy()->predict_yg_surv_rate((int)_length); | |
| 166 ++_length; | |
| 167 } | |
| 168 | |
| 169 void YoungList::add_survivor_region(HeapRegion* hr) { | |
| 545 | 170 assert(hr->is_survivor(), "should be flagged as survivor region"); |
| 342 | 171 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
| 172 | |
| 173 hr->set_next_young_region(_survivor_head); | |
| 174 if (_survivor_head == NULL) { | |
| 545 | 175 _survivor_tail = hr; |
| 342 | 176 } |
| 177 _survivor_head = hr; | |
| 178 | |
| 179 ++_survivor_length; | |
| 180 } | |
| 181 | |
| 182 HeapRegion* YoungList::pop_region() { | |
| 183 while (_head != NULL) { | |
| 184 assert( length() > 0, "list should not be empty" ); | |
| 185 HeapRegion* ret = _head; | |
| 186 _head = ret->get_next_young_region(); | |
| 187 ret->set_next_young_region(NULL); | |
| 188 --_length; | |
| 189 assert(ret->is_young(), "region should be very young"); | |
| 190 | |
| 191 // Replace 'Survivor' region type with 'Young'. So the region will | |
| 192 // be treated as a young region and will not be 'confused' with | |
| 193 // newly created survivor regions. | |
| 194 if (ret->is_survivor()) { | |
| 195 ret->set_young(); | |
| 196 } | |
| 197 | |
| 198 if (!ret->is_scan_only()) { | |
| 199 return ret; | |
| 200 } | |
| 201 | |
| 202 // scan-only, we'll add it to the scan-only list | |
| 203 if (_scan_only_tail == NULL) { | |
| 204 guarantee( _scan_only_head == NULL, "invariant" ); | |
| 205 | |
| 206 _scan_only_head = ret; | |
| 207 _curr_scan_only = ret; | |
| 208 } else { | |
| 209 guarantee( _scan_only_head != NULL, "invariant" ); | |
| 210 _scan_only_tail->set_next_young_region(ret); | |
| 211 } | |
| 212 guarantee( ret->get_next_young_region() == NULL, "invariant" ); | |
| 213 _scan_only_tail = ret; | |
| 214 | |
| 215 // no need to be tagged as scan-only any more | |
| 216 ret->set_young(); | |
| 217 | |
| 218 ++_scan_only_length; | |
| 219 } | |
| 220 assert( length() == 0, "list should be empty" ); | |
| 221 return NULL; | |
| 222 } | |
| 223 | |
| 224 void YoungList::empty_list(HeapRegion* list) { | |
| 225 while (list != NULL) { | |
| 226 HeapRegion* next = list->get_next_young_region(); | |
| 227 list->set_next_young_region(NULL); | |
| 228 list->uninstall_surv_rate_group(); | |
| 229 list->set_not_young(); | |
| 230 list = next; | |
| 231 } | |
| 232 } | |
| 233 | |
| 234 void YoungList::empty_list() { | |
| 235 assert(check_list_well_formed(), "young list should be well formed"); | |
| 236 | |
| 237 empty_list(_head); | |
| 238 _head = NULL; | |
| 239 _length = 0; | |
| 240 | |
| 241 empty_list(_scan_only_head); | |
| 242 _scan_only_head = NULL; | |
| 243 _scan_only_tail = NULL; | |
| 244 _scan_only_length = 0; | |
| 245 _curr_scan_only = NULL; | |
| 246 | |
| 247 empty_list(_survivor_head); | |
| 248 _survivor_head = NULL; | |
| 545 | 249 _survivor_tail = NULL; |
| 342 | 250 _survivor_length = 0; |
| 251 | |
| 252 _last_sampled_rs_lengths = 0; | |
| 253 | |
| 254 assert(check_list_empty(false), "just making sure..."); | |
| 255 } | |
| 256 | |
| 257 bool YoungList::check_list_well_formed() { | |
| 258 bool ret = true; | |
| 259 | |
| 260 size_t length = 0; | |
| 261 HeapRegion* curr = _head; | |
| 262 HeapRegion* last = NULL; | |
| 263 while (curr != NULL) { | |
| 264 if (!curr->is_young() || curr->is_scan_only()) { | |
| 265 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " | |
| 266 "incorrectly tagged (%d, %d)", | |
| 267 curr->bottom(), curr->end(), | |
| 268 curr->is_young(), curr->is_scan_only()); | |
| 269 ret = false; | |
| 270 } | |
| 271 ++length; | |
| 272 last = curr; | |
| 273 curr = curr->get_next_young_region(); | |
| 274 } | |
| 275 ret = ret && (length == _length); | |
| 276 | |
| 277 if (!ret) { | |
| 278 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
| 279 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
| 280 length, _length); | |
| 281 } | |
| 282 | |
| 283 bool scan_only_ret = true; | |
| 284 length = 0; | |
| 285 curr = _scan_only_head; | |
| 286 last = NULL; | |
| 287 while (curr != NULL) { | |
| 288 if (!curr->is_young() || curr->is_scan_only()) { | |
| 289 gclog_or_tty->print_cr("### SCAN-ONLY REGION "PTR_FORMAT"-"PTR_FORMAT" " | |
| 290 "incorrectly tagged (%d, %d)", | |
| 291 curr->bottom(), curr->end(), | |
| 292 curr->is_young(), curr->is_scan_only()); | |
| 293 scan_only_ret = false; | |
| 294 } | |
| 295 ++length; | |
| 296 last = curr; | |
| 297 curr = curr->get_next_young_region(); | |
| 298 } | |
| 299 scan_only_ret = scan_only_ret && (length == _scan_only_length); | |
| 300 | |
| 301 if ( (last != _scan_only_tail) || | |
| 302 (_scan_only_head == NULL && _scan_only_tail != NULL) || | |
| 303 (_scan_only_head != NULL && _scan_only_tail == NULL) ) { | |
| 304 gclog_or_tty->print_cr("## _scan_only_tail is set incorrectly"); | |
| 305 scan_only_ret = false; | |
| 306 } | |
| 307 | |
| 308 if (_curr_scan_only != NULL && _curr_scan_only != _scan_only_head) { | |
| 309 gclog_or_tty->print_cr("### _curr_scan_only is set incorrectly"); | |
| 310 scan_only_ret = false; | |
| 311 } | |
| 312 | |
| 313 if (!scan_only_ret) { | |
| 314 gclog_or_tty->print_cr("### SCAN-ONLY LIST seems not well formed!"); | |
| 315 gclog_or_tty->print_cr("### list has %d entries, _scan_only_length is %d", | |
| 316 length, _scan_only_length); | |
| 317 } | |
| 318 | |
| 319 return ret && scan_only_ret; | |
| 320 } | |
| 321 | |
| 322 bool YoungList::check_list_empty(bool ignore_scan_only_list, | |
| 323 bool check_sample) { | |
| 324 bool ret = true; | |
| 325 | |
| 326 if (_length != 0) { | |
| 327 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
| 328 _length); | |
| 329 ret = false; | |
| 330 } | |
| 331 if (check_sample && _last_sampled_rs_lengths != 0) { | |
| 332 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
| 333 ret = false; | |
| 334 } | |
| 335 if (_head != NULL) { | |
| 336 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
| 337 ret = false; | |
| 338 } | |
| 339 if (!ret) { | |
| 340 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
| 341 } | |
| 342 | |
| 343 if (ignore_scan_only_list) | |
| 344 return ret; | |
| 345 | |
| 346 bool scan_only_ret = true; | |
| 347 if (_scan_only_length != 0) { | |
| 348 gclog_or_tty->print_cr("### SCAN-ONLY LIST should have 0 length, not %d", | |
| 349 _scan_only_length); | |
| 350 scan_only_ret = false; | |
| 351 } | |
| 352 if (_scan_only_head != NULL) { | |
| 353 gclog_or_tty->print_cr("### SCAN-ONLY LIST does not have a NULL head"); | |
| 354 scan_only_ret = false; | |
| 355 } | |
| 356 if (_scan_only_tail != NULL) { | |
| 357 gclog_or_tty->print_cr("### SCAN-ONLY LIST does not have a NULL tail"); | |
| 358 scan_only_ret = false; | |
| 359 } | |
| 360 if (!scan_only_ret) { | |
| 361 gclog_or_tty->print_cr("### SCAN-ONLY LIST does not seem empty"); | |
| 362 } | |
| 363 | |
| 364 return ret && scan_only_ret; | |
| 365 } | |
| 366 | |
| 367 void | |
| 368 YoungList::rs_length_sampling_init() { | |
| 369 _sampled_rs_lengths = 0; | |
| 370 _curr = _head; | |
| 371 } | |
| 372 | |
| 373 bool | |
| 374 YoungList::rs_length_sampling_more() { | |
| 375 return _curr != NULL; | |
| 376 } | |
| 377 | |
| 378 void | |
| 379 YoungList::rs_length_sampling_next() { | |
| 380 assert( _curr != NULL, "invariant" ); | |
| 381 _sampled_rs_lengths += _curr->rem_set()->occupied(); | |
| 382 _curr = _curr->get_next_young_region(); | |
| 383 if (_curr == NULL) { | |
| 384 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
| 385 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
| 386 } | |
| 387 } | |
| 388 | |
| 389 void | |
| 390 YoungList::reset_auxilary_lists() { | |
| 391 // We could have just "moved" the scan-only list to the young list. | |
| 392 // However, the scan-only list is ordered according to the region | |
| 393 // age in descending order, so, by moving one entry at a time, we | |
| 394 // ensure that it is recreated in ascending order. | |
| 395 | |
| 396 guarantee( is_empty(), "young list should be empty" ); | |
| 397 assert(check_list_well_formed(), "young list should be well formed"); | |
| 398 | |
| 399 // Add survivor regions to SurvRateGroup. | |
| 400 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
| 545 | 401 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
| 342 | 402 for (HeapRegion* curr = _survivor_head; |
| 403 curr != NULL; | |
| 404 curr = curr->get_next_young_region()) { | |
| 405 _g1h->g1_policy()->set_region_survivors(curr); | |
| 406 } | |
| 407 _g1h->g1_policy()->note_stop_adding_survivor_regions(); | |
| 408 | |
| 409 if (_survivor_head != NULL) { | |
| 410 _head = _survivor_head; | |
| 411 _length = _survivor_length + _scan_only_length; | |
| 545 | 412 _survivor_tail->set_next_young_region(_scan_only_head); |
| 342 | 413 } else { |
| 414 _head = _scan_only_head; | |
| 415 _length = _scan_only_length; | |
| 416 } | |
| 417 | |
| 418 for (HeapRegion* curr = _scan_only_head; | |
| 419 curr != NULL; | |
| 420 curr = curr->get_next_young_region()) { | |
| 421 curr->recalculate_age_in_surv_rate_group(); | |
| 422 } | |
| 423 _scan_only_head = NULL; | |
| 424 _scan_only_tail = NULL; | |
| 425 _scan_only_length = 0; | |
| 426 _curr_scan_only = NULL; | |
| 427 | |
| 428 _survivor_head = NULL; | |
| 545 | 429 _survivor_tail = NULL; |
| 342 | 430 _survivor_length = 0; |
| 545 | 431 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
| 342 | 432 |
| 433 assert(check_list_well_formed(), "young list should be well formed"); | |
| 434 } | |
| 435 | |
| 436 void YoungList::print() { | |
| 437 HeapRegion* lists[] = {_head, _scan_only_head, _survivor_head}; | |
| 438 const char* names[] = {"YOUNG", "SCAN-ONLY", "SURVIVOR"}; | |
| 439 | |
| 440 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
| 441 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
| 442 HeapRegion *curr = lists[list]; | |
| 443 if (curr == NULL) | |
| 444 gclog_or_tty->print_cr(" empty"); | |
| 445 while (curr != NULL) { | |
| 446 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
| 447 "age: %4d, y: %d, s-o: %d, surv: %d", | |
| 448 curr->bottom(), curr->end(), | |
| 449 curr->top(), | |
| 450 curr->prev_top_at_mark_start(), | |
| 451 curr->next_top_at_mark_start(), | |
| 452 curr->top_at_conc_mark_count(), | |
| 453 curr->age_in_surv_rate_group_cond(), | |
| 454 curr->is_young(), | |
| 455 curr->is_scan_only(), | |
| 456 curr->is_survivor()); | |
| 457 curr = curr->get_next_young_region(); | |
| 458 } | |
| 459 } | |
| 460 | |
| 461 gclog_or_tty->print_cr(""); | |
| 462 } | |
| 463 | |
| 464 void G1CollectedHeap::stop_conc_gc_threads() { | |
| 465 _cg1r->cg1rThread()->stop(); | |
| 466 _czft->stop(); | |
| 467 _cmThread->stop(); | |
| 468 } | |
| 469 | |
| 470 | |
| 471 void G1CollectedHeap::check_ct_logs_at_safepoint() { | |
| 472 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 473 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
| 474 | |
| 475 // Count the dirty cards at the start. | |
| 476 CountNonCleanMemRegionClosure count1(this); | |
| 477 ct_bs->mod_card_iterate(&count1); | |
| 478 int orig_count = count1.n(); | |
| 479 | |
| 480 // First clear the logged cards. | |
| 481 ClearLoggedCardTableEntryClosure clear; | |
| 482 dcqs.set_closure(&clear); | |
| 483 dcqs.apply_closure_to_all_completed_buffers(); | |
| 484 dcqs.iterate_closure_all_threads(false); | |
| 485 clear.print_histo(); | |
| 486 | |
| 487 // Now ensure that there's no dirty cards. | |
| 488 CountNonCleanMemRegionClosure count2(this); | |
| 489 ct_bs->mod_card_iterate(&count2); | |
| 490 if (count2.n() != 0) { | |
| 491 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
| 492 count2.n(), orig_count); | |
| 493 } | |
| 494 guarantee(count2.n() == 0, "Card table should be clean."); | |
| 495 | |
| 496 RedirtyLoggedCardTableEntryClosure redirty; | |
| 497 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
| 498 dcqs.apply_closure_to_all_completed_buffers(); | |
| 499 dcqs.iterate_closure_all_threads(false); | |
| 500 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
| 501 clear.calls(), orig_count); | |
| 502 guarantee(redirty.calls() == clear.calls(), | |
| 503 "Or else mechanism is broken."); | |
| 504 | |
| 505 CountNonCleanMemRegionClosure count3(this); | |
| 506 ct_bs->mod_card_iterate(&count3); | |
| 507 if (count3.n() != orig_count) { | |
| 508 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
| 509 orig_count, count3.n()); | |
| 510 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
| 511 } | |
| 512 | |
| 513 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 514 } | |
| 515 | |
| 516 // Private class members. | |
| 517 | |
| 518 G1CollectedHeap* G1CollectedHeap::_g1h; | |
| 519 | |
| 520 // Private methods. | |
| 521 | |
| 522 // Finds a HeapRegion that can be used to allocate a given size of block. | |
| 523 | |
| 524 | |
| 525 HeapRegion* G1CollectedHeap::newAllocRegion_work(size_t word_size, | |
| 526 bool do_expand, | |
| 527 bool zero_filled) { | |
| 528 ConcurrentZFThread::note_region_alloc(); | |
| 529 HeapRegion* res = alloc_free_region_from_lists(zero_filled); | |
| 530 if (res == NULL && do_expand) { | |
| 531 expand(word_size * HeapWordSize); | |
| 532 res = alloc_free_region_from_lists(zero_filled); | |
| 533 assert(res == NULL || | |
| 534 (!res->isHumongous() && | |
| 535 (!zero_filled || | |
| 536 res->zero_fill_state() == HeapRegion::Allocated)), | |
| 537 "Alloc Regions must be zero filled (and non-H)"); | |
| 538 } | |
| 539 if (res != NULL && res->is_empty()) _free_regions--; | |
| 540 assert(res == NULL || | |
| 541 (!res->isHumongous() && | |
| 542 (!zero_filled || | |
| 543 res->zero_fill_state() == HeapRegion::Allocated)), | |
| 544 "Non-young alloc Regions must be zero filled (and non-H)"); | |
| 545 | |
| 546 if (G1TraceRegions) { | |
| 547 if (res != NULL) { | |
| 548 gclog_or_tty->print_cr("new alloc region %d:["PTR_FORMAT", "PTR_FORMAT"], " | |
| 549 "top "PTR_FORMAT, | |
| 550 res->hrs_index(), res->bottom(), res->end(), res->top()); | |
| 551 } | |
| 552 } | |
| 553 | |
| 554 return res; | |
| 555 } | |
| 556 | |
| 557 HeapRegion* G1CollectedHeap::newAllocRegionWithExpansion(int purpose, | |
| 558 size_t word_size, | |
| 559 bool zero_filled) { | |
| 560 HeapRegion* alloc_region = NULL; | |
| 561 if (_gc_alloc_region_counts[purpose] < g1_policy()->max_regions(purpose)) { | |
| 562 alloc_region = newAllocRegion_work(word_size, true, zero_filled); | |
| 563 if (purpose == GCAllocForSurvived && alloc_region != NULL) { | |
| 545 | 564 alloc_region->set_survivor(); |
| 342 | 565 } |
| 566 ++_gc_alloc_region_counts[purpose]; | |
| 567 } else { | |
| 568 g1_policy()->note_alloc_region_limit_reached(purpose); | |
| 569 } | |
| 570 return alloc_region; | |
| 571 } | |
| 572 | |
| 573 // If could fit into free regions w/o expansion, try. | |
| 574 // Otherwise, if can expand, do so. | |
| 575 // Otherwise, if using ex regions might help, try with ex given back. | |
| 576 HeapWord* G1CollectedHeap::humongousObjAllocate(size_t word_size) { | |
| 577 assert(regions_accounted_for(), "Region leakage!"); | |
| 578 | |
| 579 // We can't allocate H regions while cleanupComplete is running, since | |
| 580 // some of the regions we find to be empty might not yet be added to the | |
| 581 // unclean list. (If we're already at a safepoint, this call is | |
| 582 // unnecessary, not to mention wrong.) | |
| 583 if (!SafepointSynchronize::is_at_safepoint()) | |
| 584 wait_for_cleanup_complete(); | |
| 585 | |
| 586 size_t num_regions = | |
| 587 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; | |
| 588 | |
| 589 // Special case if < one region??? | |
| 590 | |
| 591 // Remember the ft size. | |
| 592 size_t x_size = expansion_regions(); | |
| 593 | |
| 594 HeapWord* res = NULL; | |
| 595 bool eliminated_allocated_from_lists = false; | |
| 596 | |
| 597 // Can the allocation potentially fit in the free regions? | |
| 598 if (free_regions() >= num_regions) { | |
| 599 res = _hrs->obj_allocate(word_size); | |
| 600 } | |
| 601 if (res == NULL) { | |
| 602 // Try expansion. | |
| 603 size_t fs = _hrs->free_suffix(); | |
| 604 if (fs + x_size >= num_regions) { | |
| 605 expand((num_regions - fs) * HeapRegion::GrainBytes); | |
| 606 res = _hrs->obj_allocate(word_size); | |
| 607 assert(res != NULL, "This should have worked."); | |
| 608 } else { | |
| 609 // Expansion won't help. Are there enough free regions if we get rid | |
| 610 // of reservations? | |
| 611 size_t avail = free_regions(); | |
| 612 if (avail >= num_regions) { | |
| 613 res = _hrs->obj_allocate(word_size); | |
| 614 if (res != NULL) { | |
| 615 remove_allocated_regions_from_lists(); | |
| 616 eliminated_allocated_from_lists = true; | |
| 617 } | |
| 618 } | |
| 619 } | |
| 620 } | |
| 621 if (res != NULL) { | |
| 622 // Increment by the number of regions allocated. | |
| 623 // FIXME: Assumes regions all of size GrainBytes. | |
| 624 #ifndef PRODUCT | |
| 625 mr_bs()->verify_clean_region(MemRegion(res, res + num_regions * | |
| 626 HeapRegion::GrainWords)); | |
| 627 #endif | |
| 628 if (!eliminated_allocated_from_lists) | |
| 629 remove_allocated_regions_from_lists(); | |
| 630 _summary_bytes_used += word_size * HeapWordSize; | |
| 631 _free_regions -= num_regions; | |
| 632 _num_humongous_regions += (int) num_regions; | |
| 633 } | |
| 634 assert(regions_accounted_for(), "Region Leakage"); | |
| 635 return res; | |
| 636 } | |
| 637 | |
| 638 HeapWord* | |
| 639 G1CollectedHeap::attempt_allocation_slow(size_t word_size, | |
| 640 bool permit_collection_pause) { | |
| 641 HeapWord* res = NULL; | |
| 642 HeapRegion* allocated_young_region = NULL; | |
| 643 | |
| 644 assert( SafepointSynchronize::is_at_safepoint() || | |
| 645 Heap_lock->owned_by_self(), "pre condition of the call" ); | |
| 646 | |
| 647 if (isHumongous(word_size)) { | |
| 648 // Allocation of a humongous object can, in a sense, complete a | |
| 649 // partial region, if the previous alloc was also humongous, and | |
| 650 // caused the test below to succeed. | |
| 651 if (permit_collection_pause) | |
| 652 do_collection_pause_if_appropriate(word_size); | |
| 653 res = humongousObjAllocate(word_size); | |
| 654 assert(_cur_alloc_region == NULL | |
| 655 || !_cur_alloc_region->isHumongous(), | |
| 656 "Prevent a regression of this bug."); | |
| 657 | |
| 658 } else { | |
|
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659 // We may have concurrent cleanup working at the time. Wait for it |
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660 // to complete. In the future we would probably want to make the |
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661 // concurrent cleanup truly concurrent by decoupling it from the |
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662 // allocation. |
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663 if (!SafepointSynchronize::is_at_safepoint()) |
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664 wait_for_cleanup_complete(); |
| 342 | 665 // If we do a collection pause, this will be reset to a non-NULL |
| 666 // value. If we don't, nulling here ensures that we allocate a new | |
| 667 // region below. | |
| 668 if (_cur_alloc_region != NULL) { | |
| 669 // We're finished with the _cur_alloc_region. | |
| 670 _summary_bytes_used += _cur_alloc_region->used(); | |
| 671 _cur_alloc_region = NULL; | |
| 672 } | |
| 673 assert(_cur_alloc_region == NULL, "Invariant."); | |
| 674 // Completion of a heap region is perhaps a good point at which to do | |
| 675 // a collection pause. | |
| 676 if (permit_collection_pause) | |
| 677 do_collection_pause_if_appropriate(word_size); | |
| 678 // Make sure we have an allocation region available. | |
| 679 if (_cur_alloc_region == NULL) { | |
| 680 if (!SafepointSynchronize::is_at_safepoint()) | |
| 681 wait_for_cleanup_complete(); | |
| 682 bool next_is_young = should_set_young_locked(); | |
| 683 // If the next region is not young, make sure it's zero-filled. | |
| 684 _cur_alloc_region = newAllocRegion(word_size, !next_is_young); | |
| 685 if (_cur_alloc_region != NULL) { | |
| 686 _summary_bytes_used -= _cur_alloc_region->used(); | |
| 687 if (next_is_young) { | |
| 688 set_region_short_lived_locked(_cur_alloc_region); | |
| 689 allocated_young_region = _cur_alloc_region; | |
| 690 } | |
| 691 } | |
| 692 } | |
| 693 assert(_cur_alloc_region == NULL || !_cur_alloc_region->isHumongous(), | |
| 694 "Prevent a regression of this bug."); | |
| 695 | |
| 696 // Now retry the allocation. | |
| 697 if (_cur_alloc_region != NULL) { | |
| 698 res = _cur_alloc_region->allocate(word_size); | |
| 699 } | |
| 700 } | |
| 701 | |
| 702 // NOTE: fails frequently in PRT | |
| 703 assert(regions_accounted_for(), "Region leakage!"); | |
| 704 | |
| 705 if (res != NULL) { | |
| 706 if (!SafepointSynchronize::is_at_safepoint()) { | |
| 707 assert( permit_collection_pause, "invariant" ); | |
| 708 assert( Heap_lock->owned_by_self(), "invariant" ); | |
| 709 Heap_lock->unlock(); | |
| 710 } | |
| 711 | |
| 712 if (allocated_young_region != NULL) { | |
| 713 HeapRegion* hr = allocated_young_region; | |
| 714 HeapWord* bottom = hr->bottom(); | |
| 715 HeapWord* end = hr->end(); | |
| 716 MemRegion mr(bottom, end); | |
| 717 ((CardTableModRefBS*)_g1h->barrier_set())->dirty(mr); | |
| 718 } | |
| 719 } | |
| 720 | |
| 721 assert( SafepointSynchronize::is_at_safepoint() || | |
| 722 (res == NULL && Heap_lock->owned_by_self()) || | |
| 723 (res != NULL && !Heap_lock->owned_by_self()), | |
| 724 "post condition of the call" ); | |
| 725 | |
| 726 return res; | |
| 727 } | |
| 728 | |
| 729 HeapWord* | |
| 730 G1CollectedHeap::mem_allocate(size_t word_size, | |
| 731 bool is_noref, | |
| 732 bool is_tlab, | |
| 733 bool* gc_overhead_limit_was_exceeded) { | |
| 734 debug_only(check_for_valid_allocation_state()); | |
| 735 assert(no_gc_in_progress(), "Allocation during gc not allowed"); | |
| 736 HeapWord* result = NULL; | |
| 737 | |
| 738 // Loop until the allocation is satisified, | |
| 739 // or unsatisfied after GC. | |
| 740 for (int try_count = 1; /* return or throw */; try_count += 1) { | |
| 741 int gc_count_before; | |
| 742 { | |
| 743 Heap_lock->lock(); | |
| 744 result = attempt_allocation(word_size); | |
| 745 if (result != NULL) { | |
| 746 // attempt_allocation should have unlocked the heap lock | |
| 747 assert(is_in(result), "result not in heap"); | |
| 748 return result; | |
| 749 } | |
| 750 // Read the gc count while the heap lock is held. | |
| 751 gc_count_before = SharedHeap::heap()->total_collections(); | |
| 752 Heap_lock->unlock(); | |
| 753 } | |
| 754 | |
| 755 // Create the garbage collection operation... | |
| 756 VM_G1CollectForAllocation op(word_size, | |
| 757 gc_count_before); | |
| 758 | |
| 759 // ...and get the VM thread to execute it. | |
| 760 VMThread::execute(&op); | |
| 761 if (op.prologue_succeeded()) { | |
| 762 result = op.result(); | |
| 763 assert(result == NULL || is_in(result), "result not in heap"); | |
| 764 return result; | |
| 765 } | |
| 766 | |
| 767 // Give a warning if we seem to be looping forever. | |
| 768 if ((QueuedAllocationWarningCount > 0) && | |
| 769 (try_count % QueuedAllocationWarningCount == 0)) { | |
| 770 warning("G1CollectedHeap::mem_allocate_work retries %d times", | |
| 771 try_count); | |
| 772 } | |
| 773 } | |
| 774 } | |
| 775 | |
| 776 void G1CollectedHeap::abandon_cur_alloc_region() { | |
| 777 if (_cur_alloc_region != NULL) { | |
| 778 // We're finished with the _cur_alloc_region. | |
| 779 if (_cur_alloc_region->is_empty()) { | |
| 780 _free_regions++; | |
| 781 free_region(_cur_alloc_region); | |
| 782 } else { | |
| 783 _summary_bytes_used += _cur_alloc_region->used(); | |
| 784 } | |
| 785 _cur_alloc_region = NULL; | |
| 786 } | |
| 787 } | |
| 788 | |
| 789 class PostMCRemSetClearClosure: public HeapRegionClosure { | |
| 790 ModRefBarrierSet* _mr_bs; | |
| 791 public: | |
| 792 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 793 bool doHeapRegion(HeapRegion* r) { | |
| 794 r->reset_gc_time_stamp(); | |
| 795 if (r->continuesHumongous()) | |
| 796 return false; | |
| 797 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 798 if (hrrs != NULL) hrrs->clear(); | |
| 799 // You might think here that we could clear just the cards | |
| 800 // corresponding to the used region. But no: if we leave a dirty card | |
| 801 // in a region we might allocate into, then it would prevent that card | |
| 802 // from being enqueued, and cause it to be missed. | |
| 803 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
| 804 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
| 805 return false; | |
| 806 } | |
| 807 }; | |
| 808 | |
| 809 | |
| 810 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
| 811 ModRefBarrierSet* _mr_bs; | |
| 812 public: | |
| 813 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 814 bool doHeapRegion(HeapRegion* r) { | |
| 815 if (r->continuesHumongous()) return false; | |
| 816 if (r->used_region().word_size() != 0) { | |
| 817 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
| 818 } | |
| 819 return false; | |
| 820 } | |
| 821 }; | |
| 822 | |
| 823 void G1CollectedHeap::do_collection(bool full, bool clear_all_soft_refs, | |
| 824 size_t word_size) { | |
| 825 ResourceMark rm; | |
| 826 | |
| 827 if (full && DisableExplicitGC) { | |
| 828 gclog_or_tty->print("\n\n\nDisabling Explicit GC\n\n\n"); | |
| 829 return; | |
| 830 } | |
| 831 | |
| 832 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
| 833 assert(Thread::current() == VMThread::vm_thread(), "should be in vm thread"); | |
| 834 | |
| 835 if (GC_locker::is_active()) { | |
| 836 return; // GC is disabled (e.g. JNI GetXXXCritical operation) | |
| 837 } | |
| 838 | |
| 839 { | |
| 840 IsGCActiveMark x; | |
| 841 | |
| 842 // Timing | |
| 843 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
| 844 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
| 845 TraceTime t(full ? "Full GC (System.gc())" : "Full GC", PrintGC, true, gclog_or_tty); | |
| 846 | |
| 847 double start = os::elapsedTime(); | |
| 848 GCOverheadReporter::recordSTWStart(start); | |
| 849 g1_policy()->record_full_collection_start(); | |
| 850 | |
| 851 gc_prologue(true); | |
| 852 increment_total_collections(); | |
| 853 | |
| 854 size_t g1h_prev_used = used(); | |
| 855 assert(used() == recalculate_used(), "Should be equal"); | |
| 856 | |
| 857 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
| 858 HandleMark hm; // Discard invalid handles created during verification | |
| 859 prepare_for_verify(); | |
| 860 gclog_or_tty->print(" VerifyBeforeGC:"); | |
| 861 Universe::verify(true); | |
| 862 } | |
| 863 assert(regions_accounted_for(), "Region leakage!"); | |
| 864 | |
| 865 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 866 | |
| 867 // We want to discover references, but not process them yet. | |
| 868 // This mode is disabled in | |
| 869 // instanceRefKlass::process_discovered_references if the | |
| 870 // generation does some collection work, or | |
| 871 // instanceRefKlass::enqueue_discovered_references if the | |
| 872 // generation returns without doing any work. | |
| 873 ref_processor()->disable_discovery(); | |
| 874 ref_processor()->abandon_partial_discovery(); | |
| 875 ref_processor()->verify_no_references_recorded(); | |
| 876 | |
| 877 // Abandon current iterations of concurrent marking and concurrent | |
| 878 // refinement, if any are in progress. | |
| 879 concurrent_mark()->abort(); | |
| 880 | |
| 881 // Make sure we'll choose a new allocation region afterwards. | |
| 882 abandon_cur_alloc_region(); | |
| 883 assert(_cur_alloc_region == NULL, "Invariant."); | |
| 884 g1_rem_set()->as_HRInto_G1RemSet()->cleanupHRRS(); | |
| 885 tear_down_region_lists(); | |
| 886 set_used_regions_to_need_zero_fill(); | |
| 887 if (g1_policy()->in_young_gc_mode()) { | |
| 888 empty_young_list(); | |
| 889 g1_policy()->set_full_young_gcs(true); | |
| 890 } | |
| 891 | |
| 892 // Temporarily make reference _discovery_ single threaded (non-MT). | |
| 893 ReferenceProcessorMTMutator rp_disc_ser(ref_processor(), false); | |
| 894 | |
| 895 // Temporarily make refs discovery atomic | |
| 896 ReferenceProcessorAtomicMutator rp_disc_atomic(ref_processor(), true); | |
| 897 | |
| 898 // Temporarily clear _is_alive_non_header | |
| 899 ReferenceProcessorIsAliveMutator rp_is_alive_null(ref_processor(), NULL); | |
| 900 | |
| 901 ref_processor()->enable_discovery(); | |
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902 ref_processor()->setup_policy(clear_all_soft_refs); |
| 342 | 903 |
| 904 // Do collection work | |
| 905 { | |
| 906 HandleMark hm; // Discard invalid handles created during gc | |
| 907 G1MarkSweep::invoke_at_safepoint(ref_processor(), clear_all_soft_refs); | |
| 908 } | |
| 909 // Because freeing humongous regions may have added some unclean | |
| 910 // regions, it is necessary to tear down again before rebuilding. | |
| 911 tear_down_region_lists(); | |
| 912 rebuild_region_lists(); | |
| 913 | |
| 914 _summary_bytes_used = recalculate_used(); | |
| 915 | |
| 916 ref_processor()->enqueue_discovered_references(); | |
| 917 | |
| 918 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 919 | |
| 920 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { | |
| 921 HandleMark hm; // Discard invalid handles created during verification | |
| 922 gclog_or_tty->print(" VerifyAfterGC:"); | |
| 923 Universe::verify(false); | |
| 924 } | |
| 925 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); | |
| 926 | |
| 927 reset_gc_time_stamp(); | |
| 928 // Since everything potentially moved, we will clear all remembered | |
| 929 // sets, and clear all cards. Later we will also cards in the used | |
| 930 // portion of the heap after the resizing (which could be a shrinking.) | |
| 931 // We will also reset the GC time stamps of the regions. | |
| 932 PostMCRemSetClearClosure rs_clear(mr_bs()); | |
| 933 heap_region_iterate(&rs_clear); | |
| 934 | |
| 935 // Resize the heap if necessary. | |
| 936 resize_if_necessary_after_full_collection(full ? 0 : word_size); | |
| 937 | |
| 938 // Since everything potentially moved, we will clear all remembered | |
| 939 // sets, but also dirty all cards corresponding to used regions. | |
| 940 PostMCRemSetInvalidateClosure rs_invalidate(mr_bs()); | |
| 941 heap_region_iterate(&rs_invalidate); | |
| 942 if (_cg1r->use_cache()) { | |
| 943 _cg1r->clear_and_record_card_counts(); | |
| 944 _cg1r->clear_hot_cache(); | |
| 945 } | |
| 946 | |
| 947 if (PrintGC) { | |
| 948 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
| 949 } | |
| 950 | |
| 951 if (true) { // FIXME | |
| 952 // Ask the permanent generation to adjust size for full collections | |
| 953 perm()->compute_new_size(); | |
| 954 } | |
| 955 | |
| 956 double end = os::elapsedTime(); | |
| 957 GCOverheadReporter::recordSTWEnd(end); | |
| 958 g1_policy()->record_full_collection_end(); | |
| 959 | |
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960 #ifdef TRACESPINNING |
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961 ParallelTaskTerminator::print_termination_counts(); |
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962 #endif |
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963 |
| 342 | 964 gc_epilogue(true); |
| 965 | |
| 966 // Abandon concurrent refinement. This must happen last: in the | |
| 967 // dirty-card logging system, some cards may be dirty by weak-ref | |
| 968 // processing, and may be enqueued. But the whole card table is | |
| 969 // dirtied, so this should abandon those logs, and set "do_traversal" | |
| 970 // to true. | |
| 971 concurrent_g1_refine()->set_pya_restart(); | |
|
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972 assert(!G1DeferredRSUpdate |
|
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973 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
| 342 | 974 assert(regions_accounted_for(), "Region leakage!"); |
| 975 } | |
| 976 | |
| 977 if (g1_policy()->in_young_gc_mode()) { | |
| 978 _young_list->reset_sampled_info(); | |
| 979 assert( check_young_list_empty(false, false), | |
| 980 "young list should be empty at this point"); | |
| 981 } | |
| 982 } | |
| 983 | |
| 984 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
| 985 do_collection(true, clear_all_soft_refs, 0); | |
| 986 } | |
| 987 | |
| 988 // This code is mostly copied from TenuredGeneration. | |
| 989 void | |
| 990 G1CollectedHeap:: | |
| 991 resize_if_necessary_after_full_collection(size_t word_size) { | |
| 992 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
| 993 | |
| 994 // Include the current allocation, if any, and bytes that will be | |
| 995 // pre-allocated to support collections, as "used". | |
| 996 const size_t used_after_gc = used(); | |
| 997 const size_t capacity_after_gc = capacity(); | |
| 998 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
| 999 | |
| 1000 // We don't have floating point command-line arguments | |
| 1001 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100; | |
| 1002 const double maximum_used_percentage = 1.0 - minimum_free_percentage; | |
| 1003 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100; | |
| 1004 const double minimum_used_percentage = 1.0 - maximum_free_percentage; | |
| 1005 | |
| 1006 size_t minimum_desired_capacity = (size_t) (used_after_gc / maximum_used_percentage); | |
| 1007 size_t maximum_desired_capacity = (size_t) (used_after_gc / minimum_used_percentage); | |
| 1008 | |
| 1009 // Don't shrink less than the initial size. | |
| 1010 minimum_desired_capacity = | |
| 1011 MAX2(minimum_desired_capacity, | |
| 1012 collector_policy()->initial_heap_byte_size()); | |
| 1013 maximum_desired_capacity = | |
| 1014 MAX2(maximum_desired_capacity, | |
| 1015 collector_policy()->initial_heap_byte_size()); | |
| 1016 | |
| 1017 // We are failing here because minimum_desired_capacity is | |
| 1018 assert(used_after_gc <= minimum_desired_capacity, "sanity check"); | |
| 1019 assert(minimum_desired_capacity <= maximum_desired_capacity, "sanity check"); | |
| 1020 | |
| 1021 if (PrintGC && Verbose) { | |
| 1022 const double free_percentage = ((double)free_after_gc) / capacity(); | |
| 1023 gclog_or_tty->print_cr("Computing new size after full GC "); | |
| 1024 gclog_or_tty->print_cr(" " | |
| 1025 " minimum_free_percentage: %6.2f", | |
| 1026 minimum_free_percentage); | |
| 1027 gclog_or_tty->print_cr(" " | |
| 1028 " maximum_free_percentage: %6.2f", | |
| 1029 maximum_free_percentage); | |
| 1030 gclog_or_tty->print_cr(" " | |
| 1031 " capacity: %6.1fK" | |
| 1032 " minimum_desired_capacity: %6.1fK" | |
| 1033 " maximum_desired_capacity: %6.1fK", | |
| 1034 capacity() / (double) K, | |
| 1035 minimum_desired_capacity / (double) K, | |
| 1036 maximum_desired_capacity / (double) K); | |
| 1037 gclog_or_tty->print_cr(" " | |
| 1038 " free_after_gc : %6.1fK" | |
| 1039 " used_after_gc : %6.1fK", | |
| 1040 free_after_gc / (double) K, | |
| 1041 used_after_gc / (double) K); | |
| 1042 gclog_or_tty->print_cr(" " | |
| 1043 " free_percentage: %6.2f", | |
| 1044 free_percentage); | |
| 1045 } | |
| 1046 if (capacity() < minimum_desired_capacity) { | |
| 1047 // Don't expand unless it's significant | |
| 1048 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
| 1049 expand(expand_bytes); | |
| 1050 if (PrintGC && Verbose) { | |
| 1051 gclog_or_tty->print_cr(" expanding:" | |
| 1052 " minimum_desired_capacity: %6.1fK" | |
| 1053 " expand_bytes: %6.1fK", | |
| 1054 minimum_desired_capacity / (double) K, | |
| 1055 expand_bytes / (double) K); | |
| 1056 } | |
| 1057 | |
| 1058 // No expansion, now see if we want to shrink | |
| 1059 } else if (capacity() > maximum_desired_capacity) { | |
| 1060 // Capacity too large, compute shrinking size | |
| 1061 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
| 1062 shrink(shrink_bytes); | |
| 1063 if (PrintGC && Verbose) { | |
| 1064 gclog_or_tty->print_cr(" " | |
| 1065 " shrinking:" | |
| 1066 " initSize: %.1fK" | |
| 1067 " maximum_desired_capacity: %.1fK", | |
| 1068 collector_policy()->initial_heap_byte_size() / (double) K, | |
| 1069 maximum_desired_capacity / (double) K); | |
| 1070 gclog_or_tty->print_cr(" " | |
| 1071 " shrink_bytes: %.1fK", | |
| 1072 shrink_bytes / (double) K); | |
| 1073 } | |
| 1074 } | |
| 1075 } | |
| 1076 | |
| 1077 | |
| 1078 HeapWord* | |
| 1079 G1CollectedHeap::satisfy_failed_allocation(size_t word_size) { | |
| 1080 HeapWord* result = NULL; | |
| 1081 | |
| 1082 // In a G1 heap, we're supposed to keep allocation from failing by | |
| 1083 // incremental pauses. Therefore, at least for now, we'll favor | |
| 1084 // expansion over collection. (This might change in the future if we can | |
| 1085 // do something smarter than full collection to satisfy a failed alloc.) | |
| 1086 | |
| 1087 result = expand_and_allocate(word_size); | |
| 1088 if (result != NULL) { | |
| 1089 assert(is_in(result), "result not in heap"); | |
| 1090 return result; | |
| 1091 } | |
| 1092 | |
| 1093 // OK, I guess we have to try collection. | |
| 1094 | |
| 1095 do_collection(false, false, word_size); | |
| 1096 | |
| 1097 result = attempt_allocation(word_size, /*permit_collection_pause*/false); | |
| 1098 | |
| 1099 if (result != NULL) { | |
| 1100 assert(is_in(result), "result not in heap"); | |
| 1101 return result; | |
| 1102 } | |
| 1103 | |
| 1104 // Try collecting soft references. | |
| 1105 do_collection(false, true, word_size); | |
| 1106 result = attempt_allocation(word_size, /*permit_collection_pause*/false); | |
| 1107 if (result != NULL) { | |
| 1108 assert(is_in(result), "result not in heap"); | |
| 1109 return result; | |
| 1110 } | |
| 1111 | |
| 1112 // What else? We might try synchronous finalization later. If the total | |
| 1113 // space available is large enough for the allocation, then a more | |
| 1114 // complete compaction phase than we've tried so far might be | |
| 1115 // appropriate. | |
| 1116 return NULL; | |
| 1117 } | |
| 1118 | |
| 1119 // Attempting to expand the heap sufficiently | |
| 1120 // to support an allocation of the given "word_size". If | |
| 1121 // successful, perform the allocation and return the address of the | |
| 1122 // allocated block, or else "NULL". | |
| 1123 | |
| 1124 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
| 1125 size_t expand_bytes = word_size * HeapWordSize; | |
| 1126 if (expand_bytes < MinHeapDeltaBytes) { | |
| 1127 expand_bytes = MinHeapDeltaBytes; | |
| 1128 } | |
| 1129 expand(expand_bytes); | |
| 1130 assert(regions_accounted_for(), "Region leakage!"); | |
| 1131 HeapWord* result = attempt_allocation(word_size, false /* permit_collection_pause */); | |
| 1132 return result; | |
| 1133 } | |
| 1134 | |
| 1135 size_t G1CollectedHeap::free_region_if_totally_empty(HeapRegion* hr) { | |
| 1136 size_t pre_used = 0; | |
| 1137 size_t cleared_h_regions = 0; | |
| 1138 size_t freed_regions = 0; | |
| 1139 UncleanRegionList local_list; | |
| 1140 free_region_if_totally_empty_work(hr, pre_used, cleared_h_regions, | |
| 1141 freed_regions, &local_list); | |
| 1142 | |
| 1143 finish_free_region_work(pre_used, cleared_h_regions, freed_regions, | |
| 1144 &local_list); | |
| 1145 return pre_used; | |
| 1146 } | |
| 1147 | |
| 1148 void | |
| 1149 G1CollectedHeap::free_region_if_totally_empty_work(HeapRegion* hr, | |
| 1150 size_t& pre_used, | |
| 1151 size_t& cleared_h, | |
| 1152 size_t& freed_regions, | |
| 1153 UncleanRegionList* list, | |
| 1154 bool par) { | |
| 1155 assert(!hr->continuesHumongous(), "should have filtered these out"); | |
| 1156 size_t res = 0; | |
| 1157 if (!hr->popular() && hr->used() > 0 && hr->garbage_bytes() == hr->used()) { | |
| 1158 if (!hr->is_young()) { | |
| 1159 if (G1PolicyVerbose > 0) | |
| 1160 gclog_or_tty->print_cr("Freeing empty region "PTR_FORMAT "(" SIZE_FORMAT " bytes)" | |
| 1161 " during cleanup", hr, hr->used()); | |
| 1162 free_region_work(hr, pre_used, cleared_h, freed_regions, list, par); | |
| 1163 } | |
| 1164 } | |
| 1165 } | |
| 1166 | |
| 1167 // FIXME: both this and shrink could probably be more efficient by | |
| 1168 // doing one "VirtualSpace::expand_by" call rather than several. | |
| 1169 void G1CollectedHeap::expand(size_t expand_bytes) { | |
| 1170 size_t old_mem_size = _g1_storage.committed_size(); | |
| 1171 // We expand by a minimum of 1K. | |
| 1172 expand_bytes = MAX2(expand_bytes, (size_t)K); | |
| 1173 size_t aligned_expand_bytes = | |
| 1174 ReservedSpace::page_align_size_up(expand_bytes); | |
| 1175 aligned_expand_bytes = align_size_up(aligned_expand_bytes, | |
| 1176 HeapRegion::GrainBytes); | |
| 1177 expand_bytes = aligned_expand_bytes; | |
| 1178 while (expand_bytes > 0) { | |
| 1179 HeapWord* base = (HeapWord*)_g1_storage.high(); | |
| 1180 // Commit more storage. | |
| 1181 bool successful = _g1_storage.expand_by(HeapRegion::GrainBytes); | |
| 1182 if (!successful) { | |
| 1183 expand_bytes = 0; | |
| 1184 } else { | |
| 1185 expand_bytes -= HeapRegion::GrainBytes; | |
| 1186 // Expand the committed region. | |
| 1187 HeapWord* high = (HeapWord*) _g1_storage.high(); | |
| 1188 _g1_committed.set_end(high); | |
| 1189 // Create a new HeapRegion. | |
| 1190 MemRegion mr(base, high); | |
| 1191 bool is_zeroed = !_g1_max_committed.contains(base); | |
| 1192 HeapRegion* hr = new HeapRegion(_bot_shared, mr, is_zeroed); | |
| 1193 | |
| 1194 // Now update max_committed if necessary. | |
| 1195 _g1_max_committed.set_end(MAX2(_g1_max_committed.end(), high)); | |
| 1196 | |
| 1197 // Add it to the HeapRegionSeq. | |
| 1198 _hrs->insert(hr); | |
| 1199 // Set the zero-fill state, according to whether it's already | |
| 1200 // zeroed. | |
| 1201 { | |
| 1202 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 1203 if (is_zeroed) { | |
| 1204 hr->set_zero_fill_complete(); | |
| 1205 put_free_region_on_list_locked(hr); | |
| 1206 } else { | |
| 1207 hr->set_zero_fill_needed(); | |
| 1208 put_region_on_unclean_list_locked(hr); | |
| 1209 } | |
| 1210 } | |
| 1211 _free_regions++; | |
| 1212 // And we used up an expansion region to create it. | |
| 1213 _expansion_regions--; | |
| 1214 // Tell the cardtable about it. | |
| 1215 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
| 1216 // And the offset table as well. | |
| 1217 _bot_shared->resize(_g1_committed.word_size()); | |
| 1218 } | |
| 1219 } | |
| 1220 if (Verbose && PrintGC) { | |
| 1221 size_t new_mem_size = _g1_storage.committed_size(); | |
| 1222 gclog_or_tty->print_cr("Expanding garbage-first heap from %ldK by %ldK to %ldK", | |
| 1223 old_mem_size/K, aligned_expand_bytes/K, | |
| 1224 new_mem_size/K); | |
| 1225 } | |
| 1226 } | |
| 1227 | |
| 1228 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) | |
| 1229 { | |
| 1230 size_t old_mem_size = _g1_storage.committed_size(); | |
| 1231 size_t aligned_shrink_bytes = | |
| 1232 ReservedSpace::page_align_size_down(shrink_bytes); | |
| 1233 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
| 1234 HeapRegion::GrainBytes); | |
| 1235 size_t num_regions_deleted = 0; | |
| 1236 MemRegion mr = _hrs->shrink_by(aligned_shrink_bytes, num_regions_deleted); | |
| 1237 | |
| 1238 assert(mr.end() == (HeapWord*)_g1_storage.high(), "Bad shrink!"); | |
| 1239 if (mr.byte_size() > 0) | |
| 1240 _g1_storage.shrink_by(mr.byte_size()); | |
| 1241 assert(mr.start() == (HeapWord*)_g1_storage.high(), "Bad shrink!"); | |
| 1242 | |
| 1243 _g1_committed.set_end(mr.start()); | |
| 1244 _free_regions -= num_regions_deleted; | |
| 1245 _expansion_regions += num_regions_deleted; | |
| 1246 | |
| 1247 // Tell the cardtable about it. | |
| 1248 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
| 1249 | |
| 1250 // And the offset table as well. | |
| 1251 _bot_shared->resize(_g1_committed.word_size()); | |
| 1252 | |
| 1253 HeapRegionRemSet::shrink_heap(n_regions()); | |
| 1254 | |
| 1255 if (Verbose && PrintGC) { | |
| 1256 size_t new_mem_size = _g1_storage.committed_size(); | |
| 1257 gclog_or_tty->print_cr("Shrinking garbage-first heap from %ldK by %ldK to %ldK", | |
| 1258 old_mem_size/K, aligned_shrink_bytes/K, | |
| 1259 new_mem_size/K); | |
| 1260 } | |
| 1261 } | |
| 1262 | |
| 1263 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
| 1264 release_gc_alloc_regions(); | |
| 1265 tear_down_region_lists(); // We will rebuild them in a moment. | |
| 1266 shrink_helper(shrink_bytes); | |
| 1267 rebuild_region_lists(); | |
| 1268 } | |
| 1269 | |
| 1270 // Public methods. | |
| 1271 | |
| 1272 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 1273 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 1274 #endif // _MSC_VER | |
| 1275 | |
| 1276 | |
| 1277 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
| 1278 SharedHeap(policy_), | |
| 1279 _g1_policy(policy_), | |
| 1280 _ref_processor(NULL), | |
| 1281 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), | |
| 1282 _bot_shared(NULL), | |
| 1283 _par_alloc_during_gc_lock(Mutex::leaf, "par alloc during GC lock"), | |
| 1284 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
| 1285 _evac_failure_scan_stack(NULL) , | |
| 1286 _mark_in_progress(false), | |
| 1287 _cg1r(NULL), _czft(NULL), _summary_bytes_used(0), | |
| 1288 _cur_alloc_region(NULL), | |
| 1289 _refine_cte_cl(NULL), | |
| 1290 _free_region_list(NULL), _free_region_list_size(0), | |
| 1291 _free_regions(0), | |
| 1292 _popular_object_boundary(NULL), | |
| 1293 _cur_pop_hr_index(0), | |
| 1294 _popular_regions_to_be_evacuated(NULL), | |
| 1295 _pop_obj_rc_at_copy(), | |
| 1296 _full_collection(false), | |
| 1297 _unclean_region_list(), | |
| 1298 _unclean_regions_coming(false), | |
| 1299 _young_list(new YoungList(this)), | |
| 1300 _gc_time_stamp(0), | |
| 526 | 1301 _surviving_young_words(NULL), |
| 1302 _in_cset_fast_test(NULL), | |
| 1303 _in_cset_fast_test_base(NULL) | |
| 342 | 1304 { |
| 1305 _g1h = this; // To catch bugs. | |
| 1306 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
| 1307 vm_exit_during_initialization("Failed necessary allocation."); | |
| 1308 } | |
| 1309 int n_queues = MAX2((int)ParallelGCThreads, 1); | |
| 1310 _task_queues = new RefToScanQueueSet(n_queues); | |
| 1311 | |
| 1312 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
| 1313 assert(n_rem_sets > 0, "Invariant."); | |
| 1314 | |
| 1315 HeapRegionRemSetIterator** iter_arr = | |
| 1316 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
| 1317 for (int i = 0; i < n_queues; i++) { | |
| 1318 iter_arr[i] = new HeapRegionRemSetIterator(); | |
| 1319 } | |
| 1320 _rem_set_iterator = iter_arr; | |
| 1321 | |
| 1322 for (int i = 0; i < n_queues; i++) { | |
| 1323 RefToScanQueue* q = new RefToScanQueue(); | |
| 1324 q->initialize(); | |
| 1325 _task_queues->register_queue(i, q); | |
| 1326 } | |
| 1327 | |
| 1328 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 1329 _gc_alloc_regions[ap] = NULL; | |
| 1330 _gc_alloc_region_counts[ap] = 0; | |
| 1331 } | |
| 1332 guarantee(_task_queues != NULL, "task_queues allocation failure."); | |
| 1333 } | |
| 1334 | |
| 1335 jint G1CollectedHeap::initialize() { | |
| 1336 os::enable_vtime(); | |
| 1337 | |
| 1338 // Necessary to satisfy locking discipline assertions. | |
| 1339 | |
| 1340 MutexLocker x(Heap_lock); | |
| 1341 | |
| 1342 // While there are no constraints in the GC code that HeapWordSize | |
| 1343 // be any particular value, there are multiple other areas in the | |
| 1344 // system which believe this to be true (e.g. oop->object_size in some | |
| 1345 // cases incorrectly returns the size in wordSize units rather than | |
| 1346 // HeapWordSize). | |
| 1347 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
| 1348 | |
| 1349 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
| 1350 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
| 1351 | |
| 1352 // Ensure that the sizes are properly aligned. | |
| 1353 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1354 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1355 | |
| 1356 // We allocate this in any case, but only do no work if the command line | |
| 1357 // param is off. | |
| 1358 _cg1r = new ConcurrentG1Refine(); | |
| 1359 | |
| 1360 // Reserve the maximum. | |
| 1361 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
| 1362 // Includes the perm-gen. | |
| 1363 ReservedSpace heap_rs(max_byte_size + pgs->max_size(), | |
| 1364 HeapRegion::GrainBytes, | |
| 1365 false /*ism*/); | |
| 1366 | |
| 1367 if (!heap_rs.is_reserved()) { | |
| 1368 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
| 1369 return JNI_ENOMEM; | |
| 1370 } | |
| 1371 | |
| 1372 // It is important to do this in a way such that concurrent readers can't | |
| 1373 // temporarily think somethings in the heap. (I've actually seen this | |
| 1374 // happen in asserts: DLD.) | |
| 1375 _reserved.set_word_size(0); | |
| 1376 _reserved.set_start((HeapWord*)heap_rs.base()); | |
| 1377 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 1378 | |
| 1379 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
| 1380 | |
| 1381 _num_humongous_regions = 0; | |
| 1382 | |
| 1383 // Create the gen rem set (and barrier set) for the entire reserved region. | |
| 1384 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
| 1385 set_barrier_set(rem_set()->bs()); | |
| 1386 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
| 1387 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
| 1388 } else { | |
| 1389 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
| 1390 return JNI_ENOMEM; | |
| 1391 } | |
| 1392 | |
| 1393 // Also create a G1 rem set. | |
| 1394 if (G1UseHRIntoRS) { | |
| 1395 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { | |
| 1396 _g1_rem_set = new HRInto_G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
| 1397 } else { | |
| 1398 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); | |
| 1399 return JNI_ENOMEM; | |
| 1400 } | |
| 1401 } else { | |
| 1402 _g1_rem_set = new StupidG1RemSet(this); | |
| 1403 } | |
| 1404 | |
| 1405 // Carve out the G1 part of the heap. | |
| 1406 | |
| 1407 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
| 1408 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
| 1409 g1_rs.size()/HeapWordSize); | |
| 1410 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
| 1411 | |
| 1412 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
| 1413 | |
| 1414 _g1_storage.initialize(g1_rs, 0); | |
| 1415 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
| 1416 _g1_max_committed = _g1_committed; | |
| 393 | 1417 _hrs = new HeapRegionSeq(_expansion_regions); |
| 342 | 1418 guarantee(_hrs != NULL, "Couldn't allocate HeapRegionSeq"); |
| 1419 guarantee(_cur_alloc_region == NULL, "from constructor"); | |
| 1420 | |
| 1421 _bot_shared = new G1BlockOffsetSharedArray(_reserved, | |
| 1422 heap_word_size(init_byte_size)); | |
| 1423 | |
| 1424 _g1h = this; | |
| 1425 | |
| 1426 // Create the ConcurrentMark data structure and thread. | |
| 1427 // (Must do this late, so that "max_regions" is defined.) | |
| 1428 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
| 1429 _cmThread = _cm->cmThread(); | |
| 1430 | |
| 1431 // ...and the concurrent zero-fill thread, if necessary. | |
| 1432 if (G1ConcZeroFill) { | |
| 1433 _czft = new ConcurrentZFThread(); | |
| 1434 } | |
| 1435 | |
| 1436 | |
| 1437 | |
| 1438 // Allocate the popular regions; take them off free lists. | |
| 1439 size_t pop_byte_size = G1NumPopularRegions * HeapRegion::GrainBytes; | |
| 1440 expand(pop_byte_size); | |
| 1441 _popular_object_boundary = | |
| 1442 _g1_reserved.start() + (G1NumPopularRegions * HeapRegion::GrainWords); | |
| 1443 for (int i = 0; i < G1NumPopularRegions; i++) { | |
| 1444 HeapRegion* hr = newAllocRegion(HeapRegion::GrainWords); | |
| 1445 // assert(hr != NULL && hr->bottom() < _popular_object_boundary, | |
| 1446 // "Should be enough, and all should be below boundary."); | |
| 1447 hr->set_popular(true); | |
| 1448 } | |
| 1449 assert(_cur_pop_hr_index == 0, "Start allocating at the first region."); | |
| 1450 | |
| 1451 // Initialize the from_card cache structure of HeapRegionRemSet. | |
| 1452 HeapRegionRemSet::init_heap(max_regions()); | |
| 1453 | |
| 1454 // Now expand into the rest of the initial heap size. | |
| 1455 expand(init_byte_size - pop_byte_size); | |
| 1456 | |
| 1457 // Perform any initialization actions delegated to the policy. | |
| 1458 g1_policy()->init(); | |
| 1459 | |
| 1460 g1_policy()->note_start_of_mark_thread(); | |
| 1461 | |
| 1462 _refine_cte_cl = | |
| 1463 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
| 1464 g1_rem_set(), | |
| 1465 concurrent_g1_refine()); | |
| 1466 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 1467 | |
| 1468 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
| 1469 SATB_Q_FL_lock, | |
| 1470 0, | |
| 1471 Shared_SATB_Q_lock); | |
| 1472 if (G1RSBarrierUseQueue) { | |
| 1473 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
| 1474 DirtyCardQ_FL_lock, | |
| 1475 G1DirtyCardQueueMax, | |
| 1476 Shared_DirtyCardQ_lock); | |
| 1477 } | |
|
616
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1478 if (G1DeferredRSUpdate) { |
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1479 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
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1480 DirtyCardQ_FL_lock, |
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1481 0, |
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1482 Shared_DirtyCardQ_lock, |
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1483 &JavaThread::dirty_card_queue_set()); |
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1484 } |
| 342 | 1485 // In case we're keeping closure specialization stats, initialize those |
| 1486 // counts and that mechanism. | |
| 1487 SpecializationStats::clear(); | |
| 1488 | |
| 1489 _gc_alloc_region_list = NULL; | |
| 1490 | |
| 1491 // Do later initialization work for concurrent refinement. | |
| 1492 _cg1r->init(); | |
| 1493 | |
| 1494 const char* group_names[] = { "CR", "ZF", "CM", "CL" }; | |
| 1495 GCOverheadReporter::initGCOverheadReporter(4, group_names); | |
| 1496 | |
| 1497 return JNI_OK; | |
| 1498 } | |
| 1499 | |
| 1500 void G1CollectedHeap::ref_processing_init() { | |
| 1501 SharedHeap::ref_processing_init(); | |
| 1502 MemRegion mr = reserved_region(); | |
| 1503 _ref_processor = ReferenceProcessor::create_ref_processor( | |
| 1504 mr, // span | |
| 1505 false, // Reference discovery is not atomic | |
| 1506 // (though it shouldn't matter here.) | |
| 1507 true, // mt_discovery | |
| 1508 NULL, // is alive closure: need to fill this in for efficiency | |
| 1509 ParallelGCThreads, | |
| 1510 ParallelRefProcEnabled, | |
| 1511 true); // Setting next fields of discovered | |
| 1512 // lists requires a barrier. | |
| 1513 } | |
| 1514 | |
| 1515 size_t G1CollectedHeap::capacity() const { | |
| 1516 return _g1_committed.byte_size(); | |
| 1517 } | |
| 1518 | |
| 1519 void G1CollectedHeap::iterate_dirty_card_closure(bool concurrent, | |
| 1520 int worker_i) { | |
| 1521 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 1522 int n_completed_buffers = 0; | |
| 1523 while (dcqs.apply_closure_to_completed_buffer(worker_i, 0, true)) { | |
| 1524 n_completed_buffers++; | |
| 1525 } | |
| 1526 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
| 1527 (double) n_completed_buffers); | |
| 1528 dcqs.clear_n_completed_buffers(); | |
| 1529 // Finish up the queue... | |
| 1530 if (worker_i == 0) concurrent_g1_refine()->clean_up_cache(worker_i, | |
| 1531 g1_rem_set()); | |
| 1532 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
| 1533 } | |
| 1534 | |
| 1535 | |
| 1536 // Computes the sum of the storage used by the various regions. | |
| 1537 | |
| 1538 size_t G1CollectedHeap::used() const { | |
| 1539 assert(Heap_lock->owner() != NULL, | |
| 1540 "Should be owned on this thread's behalf."); | |
| 1541 size_t result = _summary_bytes_used; | |
| 1542 if (_cur_alloc_region != NULL) | |
| 1543 result += _cur_alloc_region->used(); | |
| 1544 return result; | |
| 1545 } | |
| 1546 | |
| 1547 class SumUsedClosure: public HeapRegionClosure { | |
| 1548 size_t _used; | |
| 1549 public: | |
| 1550 SumUsedClosure() : _used(0) {} | |
| 1551 bool doHeapRegion(HeapRegion* r) { | |
| 1552 if (!r->continuesHumongous()) { | |
| 1553 _used += r->used(); | |
| 1554 } | |
| 1555 return false; | |
| 1556 } | |
| 1557 size_t result() { return _used; } | |
| 1558 }; | |
| 1559 | |
| 1560 size_t G1CollectedHeap::recalculate_used() const { | |
| 1561 SumUsedClosure blk; | |
| 1562 _hrs->iterate(&blk); | |
| 1563 return blk.result(); | |
| 1564 } | |
| 1565 | |
| 1566 #ifndef PRODUCT | |
| 1567 class SumUsedRegionsClosure: public HeapRegionClosure { | |
| 1568 size_t _num; | |
| 1569 public: | |
| 1570 // _num is set to 1 to account for the popular region | |
| 1571 SumUsedRegionsClosure() : _num(G1NumPopularRegions) {} | |
| 1572 bool doHeapRegion(HeapRegion* r) { | |
| 1573 if (r->continuesHumongous() || r->used() > 0 || r->is_gc_alloc_region()) { | |
| 1574 _num += 1; | |
| 1575 } | |
| 1576 return false; | |
| 1577 } | |
| 1578 size_t result() { return _num; } | |
| 1579 }; | |
| 1580 | |
| 1581 size_t G1CollectedHeap::recalculate_used_regions() const { | |
| 1582 SumUsedRegionsClosure blk; | |
| 1583 _hrs->iterate(&blk); | |
| 1584 return blk.result(); | |
| 1585 } | |
| 1586 #endif // PRODUCT | |
| 1587 | |
| 1588 size_t G1CollectedHeap::unsafe_max_alloc() { | |
| 1589 if (_free_regions > 0) return HeapRegion::GrainBytes; | |
| 1590 // otherwise, is there space in the current allocation region? | |
| 1591 | |
| 1592 // We need to store the current allocation region in a local variable | |
| 1593 // here. The problem is that this method doesn't take any locks and | |
| 1594 // there may be other threads which overwrite the current allocation | |
| 1595 // region field. attempt_allocation(), for example, sets it to NULL | |
| 1596 // and this can happen *after* the NULL check here but before the call | |
| 1597 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
| 1598 // to be a problem in the optimized build, since the two loads of the | |
| 1599 // current allocation region field are optimized away. | |
| 1600 HeapRegion* car = _cur_alloc_region; | |
| 1601 | |
| 1602 // FIXME: should iterate over all regions? | |
| 1603 if (car == NULL) { | |
| 1604 return 0; | |
| 1605 } | |
| 1606 return car->free(); | |
| 1607 } | |
| 1608 | |
| 1609 void G1CollectedHeap::collect(GCCause::Cause cause) { | |
| 1610 // The caller doesn't have the Heap_lock | |
| 1611 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
| 1612 MutexLocker ml(Heap_lock); | |
| 1613 collect_locked(cause); | |
| 1614 } | |
| 1615 | |
| 1616 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { | |
| 1617 assert(Thread::current()->is_VM_thread(), "Precondition#1"); | |
| 1618 assert(Heap_lock->is_locked(), "Precondition#2"); | |
| 1619 GCCauseSetter gcs(this, cause); | |
| 1620 switch (cause) { | |
| 1621 case GCCause::_heap_inspection: | |
| 1622 case GCCause::_heap_dump: { | |
| 1623 HandleMark hm; | |
| 1624 do_full_collection(false); // don't clear all soft refs | |
| 1625 break; | |
| 1626 } | |
| 1627 default: // XXX FIX ME | |
| 1628 ShouldNotReachHere(); // Unexpected use of this function | |
| 1629 } | |
| 1630 } | |
| 1631 | |
| 1632 | |
| 1633 void G1CollectedHeap::collect_locked(GCCause::Cause cause) { | |
| 1634 // Don't want to do a GC until cleanup is completed. | |
| 1635 wait_for_cleanup_complete(); | |
| 1636 | |
| 1637 // Read the GC count while holding the Heap_lock | |
| 1638 int gc_count_before = SharedHeap::heap()->total_collections(); | |
| 1639 { | |
| 1640 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
| 1641 VM_G1CollectFull op(gc_count_before, cause); | |
| 1642 VMThread::execute(&op); | |
| 1643 } | |
| 1644 } | |
| 1645 | |
| 1646 bool G1CollectedHeap::is_in(const void* p) const { | |
| 1647 if (_g1_committed.contains(p)) { | |
| 1648 HeapRegion* hr = _hrs->addr_to_region(p); | |
| 1649 return hr->is_in(p); | |
| 1650 } else { | |
| 1651 return _perm_gen->as_gen()->is_in(p); | |
| 1652 } | |
| 1653 } | |
| 1654 | |
| 1655 // Iteration functions. | |
| 1656 | |
| 1657 // Iterates an OopClosure over all ref-containing fields of objects | |
| 1658 // within a HeapRegion. | |
| 1659 | |
| 1660 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
| 1661 MemRegion _mr; | |
| 1662 OopClosure* _cl; | |
| 1663 public: | |
| 1664 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
| 1665 : _mr(mr), _cl(cl) {} | |
| 1666 bool doHeapRegion(HeapRegion* r) { | |
| 1667 if (! r->continuesHumongous()) { | |
| 1668 r->oop_iterate(_cl); | |
| 1669 } | |
| 1670 return false; | |
| 1671 } | |
| 1672 }; | |
| 1673 | |
| 1674 void G1CollectedHeap::oop_iterate(OopClosure* cl) { | |
| 1675 IterateOopClosureRegionClosure blk(_g1_committed, cl); | |
| 1676 _hrs->iterate(&blk); | |
| 1677 } | |
| 1678 | |
| 1679 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl) { | |
| 1680 IterateOopClosureRegionClosure blk(mr, cl); | |
| 1681 _hrs->iterate(&blk); | |
| 1682 } | |
| 1683 | |
| 1684 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
| 1685 | |
| 1686 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
| 1687 ObjectClosure* _cl; | |
| 1688 public: | |
| 1689 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
| 1690 bool doHeapRegion(HeapRegion* r) { | |
| 1691 if (! r->continuesHumongous()) { | |
| 1692 r->object_iterate(_cl); | |
| 1693 } | |
| 1694 return false; | |
| 1695 } | |
| 1696 }; | |
| 1697 | |
| 1698 void G1CollectedHeap::object_iterate(ObjectClosure* cl) { | |
| 1699 IterateObjectClosureRegionClosure blk(cl); | |
| 1700 _hrs->iterate(&blk); | |
| 1701 } | |
| 1702 | |
| 1703 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
| 1704 // FIXME: is this right? | |
| 1705 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
| 1706 } | |
| 1707 | |
| 1708 // Calls a SpaceClosure on a HeapRegion. | |
| 1709 | |
| 1710 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
| 1711 SpaceClosure* _cl; | |
| 1712 public: | |
| 1713 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
| 1714 bool doHeapRegion(HeapRegion* r) { | |
| 1715 _cl->do_space(r); | |
| 1716 return false; | |
| 1717 } | |
| 1718 }; | |
| 1719 | |
| 1720 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
| 1721 SpaceClosureRegionClosure blk(cl); | |
| 1722 _hrs->iterate(&blk); | |
| 1723 } | |
| 1724 | |
| 1725 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) { | |
| 1726 _hrs->iterate(cl); | |
| 1727 } | |
| 1728 | |
| 1729 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
| 1730 HeapRegionClosure* cl) { | |
| 1731 _hrs->iterate_from(r, cl); | |
| 1732 } | |
| 1733 | |
| 1734 void | |
| 1735 G1CollectedHeap::heap_region_iterate_from(int idx, HeapRegionClosure* cl) { | |
| 1736 _hrs->iterate_from(idx, cl); | |
| 1737 } | |
| 1738 | |
| 1739 HeapRegion* G1CollectedHeap::region_at(size_t idx) { return _hrs->at(idx); } | |
| 1740 | |
| 1741 void | |
| 1742 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
| 1743 int worker, | |
| 1744 jint claim_value) { | |
| 355 | 1745 const size_t regions = n_regions(); |
| 1746 const size_t worker_num = (ParallelGCThreads > 0 ? ParallelGCThreads : 1); | |
| 1747 // try to spread out the starting points of the workers | |
| 1748 const size_t start_index = regions / worker_num * (size_t) worker; | |
| 1749 | |
| 1750 // each worker will actually look at all regions | |
| 1751 for (size_t count = 0; count < regions; ++count) { | |
| 1752 const size_t index = (start_index + count) % regions; | |
| 1753 assert(0 <= index && index < regions, "sanity"); | |
| 1754 HeapRegion* r = region_at(index); | |
| 1755 // we'll ignore "continues humongous" regions (we'll process them | |
| 1756 // when we come across their corresponding "start humongous" | |
| 1757 // region) and regions already claimed | |
| 1758 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
| 1759 continue; | |
| 1760 } | |
| 1761 // OK, try to claim it | |
| 342 | 1762 if (r->claimHeapRegion(claim_value)) { |
| 355 | 1763 // success! |
| 1764 assert(!r->continuesHumongous(), "sanity"); | |
| 1765 if (r->startsHumongous()) { | |
| 1766 // If the region is "starts humongous" we'll iterate over its | |
| 1767 // "continues humongous" first; in fact we'll do them | |
| 1768 // first. The order is important. In on case, calling the | |
| 1769 // closure on the "starts humongous" region might de-allocate | |
| 1770 // and clear all its "continues humongous" regions and, as a | |
| 1771 // result, we might end up processing them twice. So, we'll do | |
| 1772 // them first (notice: most closures will ignore them anyway) and | |
| 1773 // then we'll do the "starts humongous" region. | |
| 1774 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
| 1775 HeapRegion* chr = region_at(ch_index); | |
| 1776 | |
| 1777 // if the region has already been claimed or it's not | |
| 1778 // "continues humongous" we're done | |
| 1779 if (chr->claim_value() == claim_value || | |
| 1780 !chr->continuesHumongous()) { | |
| 1781 break; | |
| 1782 } | |
| 1783 | |
| 1784 // Noone should have claimed it directly. We can given | |
| 1785 // that we claimed its "starts humongous" region. | |
| 1786 assert(chr->claim_value() != claim_value, "sanity"); | |
| 1787 assert(chr->humongous_start_region() == r, "sanity"); | |
| 1788 | |
| 1789 if (chr->claimHeapRegion(claim_value)) { | |
| 1790 // we should always be able to claim it; noone else should | |
| 1791 // be trying to claim this region | |
| 1792 | |
| 1793 bool res2 = cl->doHeapRegion(chr); | |
| 1794 assert(!res2, "Should not abort"); | |
| 1795 | |
| 1796 // Right now, this holds (i.e., no closure that actually | |
| 1797 // does something with "continues humongous" regions | |
| 1798 // clears them). We might have to weaken it in the future, | |
| 1799 // but let's leave these two asserts here for extra safety. | |
| 1800 assert(chr->continuesHumongous(), "should still be the case"); | |
| 1801 assert(chr->humongous_start_region() == r, "sanity"); | |
| 1802 } else { | |
| 1803 guarantee(false, "we should not reach here"); | |
| 1804 } | |
| 1805 } | |
| 1806 } | |
| 1807 | |
| 1808 assert(!r->continuesHumongous(), "sanity"); | |
| 1809 bool res = cl->doHeapRegion(r); | |
| 1810 assert(!res, "Should not abort"); | |
| 1811 } | |
| 1812 } | |
| 1813 } | |
| 1814 | |
| 390 | 1815 class ResetClaimValuesClosure: public HeapRegionClosure { |
| 1816 public: | |
| 1817 bool doHeapRegion(HeapRegion* r) { | |
| 1818 r->set_claim_value(HeapRegion::InitialClaimValue); | |
| 1819 return false; | |
| 1820 } | |
| 1821 }; | |
| 1822 | |
| 1823 void | |
| 1824 G1CollectedHeap::reset_heap_region_claim_values() { | |
| 1825 ResetClaimValuesClosure blk; | |
| 1826 heap_region_iterate(&blk); | |
| 1827 } | |
| 1828 | |
| 355 | 1829 #ifdef ASSERT |
| 1830 // This checks whether all regions in the heap have the correct claim | |
| 1831 // value. I also piggy-backed on this a check to ensure that the | |
| 1832 // humongous_start_region() information on "continues humongous" | |
| 1833 // regions is correct. | |
| 1834 | |
| 1835 class CheckClaimValuesClosure : public HeapRegionClosure { | |
| 1836 private: | |
| 1837 jint _claim_value; | |
| 1838 size_t _failures; | |
| 1839 HeapRegion* _sh_region; | |
| 1840 public: | |
| 1841 CheckClaimValuesClosure(jint claim_value) : | |
| 1842 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
| 1843 bool doHeapRegion(HeapRegion* r) { | |
| 1844 if (r->claim_value() != _claim_value) { | |
| 1845 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
| 1846 "claim value = %d, should be %d", | |
| 1847 r->bottom(), r->end(), r->claim_value(), | |
| 1848 _claim_value); | |
| 1849 ++_failures; | |
| 1850 } | |
| 1851 if (!r->isHumongous()) { | |
| 1852 _sh_region = NULL; | |
| 1853 } else if (r->startsHumongous()) { | |
| 1854 _sh_region = r; | |
| 1855 } else if (r->continuesHumongous()) { | |
| 1856 if (r->humongous_start_region() != _sh_region) { | |
| 1857 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
| 1858 "HS = "PTR_FORMAT", should be "PTR_FORMAT, | |
| 1859 r->bottom(), r->end(), | |
| 1860 r->humongous_start_region(), | |
| 1861 _sh_region); | |
| 1862 ++_failures; | |
| 342 | 1863 } |
| 1864 } | |
| 355 | 1865 return false; |
| 1866 } | |
| 1867 size_t failures() { | |
| 1868 return _failures; | |
| 1869 } | |
| 1870 }; | |
| 1871 | |
| 1872 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
| 1873 CheckClaimValuesClosure cl(claim_value); | |
| 1874 heap_region_iterate(&cl); | |
| 1875 return cl.failures() == 0; | |
| 1876 } | |
| 1877 #endif // ASSERT | |
| 342 | 1878 |
| 1879 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { | |
| 1880 HeapRegion* r = g1_policy()->collection_set(); | |
| 1881 while (r != NULL) { | |
| 1882 HeapRegion* next = r->next_in_collection_set(); | |
| 1883 if (cl->doHeapRegion(r)) { | |
| 1884 cl->incomplete(); | |
| 1885 return; | |
| 1886 } | |
| 1887 r = next; | |
| 1888 } | |
| 1889 } | |
| 1890 | |
| 1891 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
| 1892 HeapRegionClosure *cl) { | |
| 1893 assert(r->in_collection_set(), | |
| 1894 "Start region must be a member of the collection set."); | |
| 1895 HeapRegion* cur = r; | |
| 1896 while (cur != NULL) { | |
| 1897 HeapRegion* next = cur->next_in_collection_set(); | |
| 1898 if (cl->doHeapRegion(cur) && false) { | |
| 1899 cl->incomplete(); | |
| 1900 return; | |
| 1901 } | |
| 1902 cur = next; | |
| 1903 } | |
| 1904 cur = g1_policy()->collection_set(); | |
| 1905 while (cur != r) { | |
| 1906 HeapRegion* next = cur->next_in_collection_set(); | |
| 1907 if (cl->doHeapRegion(cur) && false) { | |
| 1908 cl->incomplete(); | |
| 1909 return; | |
| 1910 } | |
| 1911 cur = next; | |
| 1912 } | |
| 1913 } | |
| 1914 | |
| 1915 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
| 1916 return _hrs->length() > 0 ? _hrs->at(0) : NULL; | |
| 1917 } | |
| 1918 | |
| 1919 | |
| 1920 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
| 1921 Space* res = heap_region_containing(addr); | |
| 1922 if (res == NULL) | |
| 1923 res = perm_gen()->space_containing(addr); | |
| 1924 return res; | |
| 1925 } | |
| 1926 | |
| 1927 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
| 1928 Space* sp = space_containing(addr); | |
| 1929 if (sp != NULL) { | |
| 1930 return sp->block_start(addr); | |
| 1931 } | |
| 1932 return NULL; | |
| 1933 } | |
| 1934 | |
| 1935 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
| 1936 Space* sp = space_containing(addr); | |
| 1937 assert(sp != NULL, "block_size of address outside of heap"); | |
| 1938 return sp->block_size(addr); | |
| 1939 } | |
| 1940 | |
| 1941 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
| 1942 Space* sp = space_containing(addr); | |
| 1943 return sp->block_is_obj(addr); | |
| 1944 } | |
| 1945 | |
| 1946 bool G1CollectedHeap::supports_tlab_allocation() const { | |
| 1947 return true; | |
| 1948 } | |
| 1949 | |
| 1950 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
| 1951 return HeapRegion::GrainBytes; | |
| 1952 } | |
| 1953 | |
| 1954 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
| 1955 // Return the remaining space in the cur alloc region, but not less than | |
| 1956 // the min TLAB size. | |
| 1957 // Also, no more than half the region size, since we can't allow tlabs to | |
| 1958 // grow big enough to accomodate humongous objects. | |
| 1959 | |
| 1960 // We need to story it locally, since it might change between when we | |
| 1961 // test for NULL and when we use it later. | |
| 1962 ContiguousSpace* cur_alloc_space = _cur_alloc_region; | |
| 1963 if (cur_alloc_space == NULL) { | |
| 1964 return HeapRegion::GrainBytes/2; | |
| 1965 } else { | |
| 1966 return MAX2(MIN2(cur_alloc_space->free(), | |
| 1967 (size_t)(HeapRegion::GrainBytes/2)), | |
| 1968 (size_t)MinTLABSize); | |
| 1969 } | |
| 1970 } | |
| 1971 | |
| 1972 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t size) { | |
| 1973 bool dummy; | |
| 1974 return G1CollectedHeap::mem_allocate(size, false, true, &dummy); | |
| 1975 } | |
| 1976 | |
| 1977 bool G1CollectedHeap::allocs_are_zero_filled() { | |
| 1978 return false; | |
| 1979 } | |
| 1980 | |
| 1981 size_t G1CollectedHeap::large_typearray_limit() { | |
| 1982 // FIXME | |
| 1983 return HeapRegion::GrainBytes/HeapWordSize; | |
| 1984 } | |
| 1985 | |
| 1986 size_t G1CollectedHeap::max_capacity() const { | |
| 1987 return _g1_committed.byte_size(); | |
| 1988 } | |
| 1989 | |
| 1990 jlong G1CollectedHeap::millis_since_last_gc() { | |
| 1991 // assert(false, "NYI"); | |
| 1992 return 0; | |
| 1993 } | |
| 1994 | |
| 1995 | |
| 1996 void G1CollectedHeap::prepare_for_verify() { | |
| 1997 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
| 1998 ensure_parsability(false); | |
| 1999 } | |
| 2000 g1_rem_set()->prepare_for_verify(); | |
| 2001 } | |
| 2002 | |
| 2003 class VerifyLivenessOopClosure: public OopClosure { | |
| 2004 G1CollectedHeap* g1h; | |
| 2005 public: | |
| 2006 VerifyLivenessOopClosure(G1CollectedHeap* _g1h) { | |
| 2007 g1h = _g1h; | |
| 2008 } | |
| 2009 void do_oop(narrowOop *p) { | |
| 2010 guarantee(false, "NYI"); | |
| 2011 } | |
| 2012 void do_oop(oop *p) { | |
| 2013 oop obj = *p; | |
| 2014 assert(obj == NULL || !g1h->is_obj_dead(obj), | |
| 2015 "Dead object referenced by a not dead object"); | |
| 2016 } | |
| 2017 }; | |
| 2018 | |
| 2019 class VerifyObjsInRegionClosure: public ObjectClosure { | |
| 2020 G1CollectedHeap* _g1h; | |
| 2021 size_t _live_bytes; | |
| 2022 HeapRegion *_hr; | |
| 2023 public: | |
| 2024 VerifyObjsInRegionClosure(HeapRegion *hr) : _live_bytes(0), _hr(hr) { | |
| 2025 _g1h = G1CollectedHeap::heap(); | |
| 2026 } | |
| 2027 void do_object(oop o) { | |
| 2028 VerifyLivenessOopClosure isLive(_g1h); | |
| 2029 assert(o != NULL, "Huh?"); | |
| 2030 if (!_g1h->is_obj_dead(o)) { | |
| 2031 o->oop_iterate(&isLive); | |
| 2032 if (!_hr->obj_allocated_since_prev_marking(o)) | |
| 2033 _live_bytes += (o->size() * HeapWordSize); | |
| 2034 } | |
| 2035 } | |
| 2036 size_t live_bytes() { return _live_bytes; } | |
| 2037 }; | |
| 2038 | |
| 2039 class PrintObjsInRegionClosure : public ObjectClosure { | |
| 2040 HeapRegion *_hr; | |
| 2041 G1CollectedHeap *_g1; | |
| 2042 public: | |
| 2043 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
| 2044 _g1 = G1CollectedHeap::heap(); | |
| 2045 }; | |
| 2046 | |
| 2047 void do_object(oop o) { | |
| 2048 if (o != NULL) { | |
| 2049 HeapWord *start = (HeapWord *) o; | |
| 2050 size_t word_sz = o->size(); | |
| 2051 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
| 2052 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
| 2053 (void*) o, word_sz, | |
| 2054 _g1->isMarkedPrev(o), | |
| 2055 _g1->isMarkedNext(o), | |
| 2056 _hr->obj_allocated_since_prev_marking(o)); | |
| 2057 HeapWord *end = start + word_sz; | |
| 2058 HeapWord *cur; | |
| 2059 int *val; | |
| 2060 for (cur = start; cur < end; cur++) { | |
| 2061 val = (int *) cur; | |
| 2062 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
| 2063 } | |
| 2064 } | |
| 2065 } | |
| 2066 }; | |
| 2067 | |
| 2068 class VerifyRegionClosure: public HeapRegionClosure { | |
| 2069 public: | |
| 2070 bool _allow_dirty; | |
| 390 | 2071 bool _par; |
| 2072 VerifyRegionClosure(bool allow_dirty, bool par = false) | |
| 2073 : _allow_dirty(allow_dirty), _par(par) {} | |
| 342 | 2074 bool doHeapRegion(HeapRegion* r) { |
| 390 | 2075 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
| 2076 "Should be unclaimed at verify points."); | |
| 342 | 2077 if (r->isHumongous()) { |
| 2078 if (r->startsHumongous()) { | |
| 2079 // Verify the single H object. | |
| 2080 oop(r->bottom())->verify(); | |
| 2081 size_t word_sz = oop(r->bottom())->size(); | |
| 2082 guarantee(r->top() == r->bottom() + word_sz, | |
| 2083 "Only one object in a humongous region"); | |
| 2084 } | |
| 2085 } else { | |
| 2086 VerifyObjsInRegionClosure not_dead_yet_cl(r); | |
| 2087 r->verify(_allow_dirty); | |
| 2088 r->object_iterate(¬_dead_yet_cl); | |
| 2089 guarantee(r->max_live_bytes() >= not_dead_yet_cl.live_bytes(), | |
| 2090 "More live objects than counted in last complete marking."); | |
| 2091 } | |
| 2092 return false; | |
| 2093 } | |
| 2094 }; | |
| 2095 | |
| 2096 class VerifyRootsClosure: public OopsInGenClosure { | |
| 2097 private: | |
| 2098 G1CollectedHeap* _g1h; | |
| 2099 bool _failures; | |
| 2100 | |
| 2101 public: | |
| 2102 VerifyRootsClosure() : | |
| 2103 _g1h(G1CollectedHeap::heap()), _failures(false) { } | |
| 2104 | |
| 2105 bool failures() { return _failures; } | |
| 2106 | |
| 2107 void do_oop(narrowOop* p) { | |
| 2108 guarantee(false, "NYI"); | |
| 2109 } | |
| 2110 | |
| 2111 void do_oop(oop* p) { | |
| 2112 oop obj = *p; | |
| 2113 if (obj != NULL) { | |
| 2114 if (_g1h->is_obj_dead(obj)) { | |
| 2115 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " | |
| 2116 "points to dead obj "PTR_FORMAT, p, (void*) obj); | |
| 2117 obj->print_on(gclog_or_tty); | |
| 2118 _failures = true; | |
| 2119 } | |
| 2120 } | |
| 2121 } | |
| 2122 }; | |
| 2123 | |
| 390 | 2124 // This is the task used for parallel heap verification. |
| 2125 | |
| 2126 class G1ParVerifyTask: public AbstractGangTask { | |
| 2127 private: | |
| 2128 G1CollectedHeap* _g1h; | |
| 2129 bool _allow_dirty; | |
| 2130 | |
| 2131 public: | |
| 2132 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty) : | |
| 2133 AbstractGangTask("Parallel verify task"), | |
| 2134 _g1h(g1h), _allow_dirty(allow_dirty) { } | |
| 2135 | |
| 2136 void work(int worker_i) { | |
| 2137 VerifyRegionClosure blk(_allow_dirty, true); | |
| 2138 _g1h->heap_region_par_iterate_chunked(&blk, worker_i, | |
| 2139 HeapRegion::ParVerifyClaimValue); | |
| 2140 } | |
| 2141 }; | |
| 2142 | |
| 342 | 2143 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
| 2144 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
| 2145 if (!silent) { gclog_or_tty->print("roots "); } | |
| 2146 VerifyRootsClosure rootsCl; | |
| 2147 process_strong_roots(false, | |
| 2148 SharedHeap::SO_AllClasses, | |
| 2149 &rootsCl, | |
| 2150 &rootsCl); | |
| 2151 rem_set()->invalidate(perm_gen()->used_region(), false); | |
| 2152 if (!silent) { gclog_or_tty->print("heapRegions "); } | |
| 390 | 2153 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
| 2154 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2155 "sanity check"); | |
| 2156 | |
| 2157 G1ParVerifyTask task(this, allow_dirty); | |
| 2158 int n_workers = workers()->total_workers(); | |
| 2159 set_par_threads(n_workers); | |
| 2160 workers()->run_task(&task); | |
| 2161 set_par_threads(0); | |
| 2162 | |
| 2163 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), | |
| 2164 "sanity check"); | |
| 2165 | |
| 2166 reset_heap_region_claim_values(); | |
| 2167 | |
| 2168 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2169 "sanity check"); | |
| 2170 } else { | |
| 2171 VerifyRegionClosure blk(allow_dirty); | |
| 2172 _hrs->iterate(&blk); | |
| 2173 } | |
| 342 | 2174 if (!silent) gclog_or_tty->print("remset "); |
| 2175 rem_set()->verify(); | |
| 2176 guarantee(!rootsCl.failures(), "should not have had failures"); | |
| 2177 } else { | |
| 2178 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
| 2179 } | |
| 2180 } | |
| 2181 | |
| 2182 class PrintRegionClosure: public HeapRegionClosure { | |
| 2183 outputStream* _st; | |
| 2184 public: | |
| 2185 PrintRegionClosure(outputStream* st) : _st(st) {} | |
| 2186 bool doHeapRegion(HeapRegion* r) { | |
| 2187 r->print_on(_st); | |
| 2188 return false; | |
| 2189 } | |
| 2190 }; | |
| 2191 | |
| 2192 void G1CollectedHeap::print() const { print_on(gclog_or_tty); } | |
| 2193 | |
| 2194 void G1CollectedHeap::print_on(outputStream* st) const { | |
| 2195 PrintRegionClosure blk(st); | |
| 2196 _hrs->iterate(&blk); | |
| 2197 } | |
| 2198 | |
| 2199 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
| 2200 if (ParallelGCThreads > 0) { | |
| 2201 workers()->print_worker_threads(); | |
| 2202 } | |
| 2203 st->print("\"G1 concurrent mark GC Thread\" "); | |
| 2204 _cmThread->print(); | |
| 2205 st->cr(); | |
| 2206 st->print("\"G1 concurrent refinement GC Thread\" "); | |
| 2207 _cg1r->cg1rThread()->print_on(st); | |
| 2208 st->cr(); | |
| 2209 st->print("\"G1 zero-fill GC Thread\" "); | |
| 2210 _czft->print_on(st); | |
| 2211 st->cr(); | |
| 2212 } | |
| 2213 | |
| 2214 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
| 2215 if (ParallelGCThreads > 0) { | |
| 2216 workers()->threads_do(tc); | |
| 2217 } | |
| 2218 tc->do_thread(_cmThread); | |
| 2219 tc->do_thread(_cg1r->cg1rThread()); | |
| 2220 tc->do_thread(_czft); | |
| 2221 } | |
| 2222 | |
| 2223 void G1CollectedHeap::print_tracing_info() const { | |
| 2224 concurrent_g1_refine()->print_final_card_counts(); | |
| 2225 | |
| 2226 // We'll overload this to mean "trace GC pause statistics." | |
| 2227 if (TraceGen0Time || TraceGen1Time) { | |
| 2228 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
| 2229 // to that. | |
| 2230 g1_policy()->print_tracing_info(); | |
| 2231 } | |
| 2232 if (SummarizeG1RSStats) { | |
| 2233 g1_rem_set()->print_summary_info(); | |
| 2234 } | |
| 2235 if (SummarizeG1ConcMark) { | |
| 2236 concurrent_mark()->print_summary_info(); | |
| 2237 } | |
| 2238 if (SummarizeG1ZFStats) { | |
| 2239 ConcurrentZFThread::print_summary_info(); | |
| 2240 } | |
| 2241 if (G1SummarizePopularity) { | |
| 2242 print_popularity_summary_info(); | |
| 2243 } | |
| 2244 g1_policy()->print_yg_surv_rate_info(); | |
| 2245 | |
| 2246 GCOverheadReporter::printGCOverhead(); | |
| 2247 | |
| 2248 SpecializationStats::print(); | |
| 2249 } | |
| 2250 | |
| 2251 | |
| 2252 int G1CollectedHeap::addr_to_arena_id(void* addr) const { | |
| 2253 HeapRegion* hr = heap_region_containing(addr); | |
| 2254 if (hr == NULL) { | |
| 2255 return 0; | |
| 2256 } else { | |
| 2257 return 1; | |
| 2258 } | |
| 2259 } | |
| 2260 | |
| 2261 G1CollectedHeap* G1CollectedHeap::heap() { | |
| 2262 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
| 2263 "not a garbage-first heap"); | |
| 2264 return _g1h; | |
| 2265 } | |
| 2266 | |
| 2267 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
| 2268 if (PrintHeapAtGC){ | |
| 2269 gclog_or_tty->print_cr(" {Heap before GC collections=%d:", total_collections()); | |
| 2270 Universe::print(); | |
| 2271 } | |
| 2272 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); | |
| 2273 // Call allocation profiler | |
| 2274 AllocationProfiler::iterate_since_last_gc(); | |
| 2275 // Fill TLAB's and such | |
| 2276 ensure_parsability(true); | |
| 2277 } | |
| 2278 | |
| 2279 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
| 2280 // FIXME: what is this about? | |
| 2281 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
| 2282 // is set. | |
| 2283 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
| 2284 "derived pointer present")); | |
| 2285 | |
| 2286 if (PrintHeapAtGC){ | |
| 2287 gclog_or_tty->print_cr(" Heap after GC collections=%d:", total_collections()); | |
| 2288 Universe::print(); | |
| 2289 gclog_or_tty->print("} "); | |
| 2290 } | |
| 2291 } | |
| 2292 | |
| 2293 void G1CollectedHeap::do_collection_pause() { | |
| 2294 // Read the GC count while holding the Heap_lock | |
| 2295 // we need to do this _before_ wait_for_cleanup_complete(), to | |
| 2296 // ensure that we do not give up the heap lock and potentially | |
| 2297 // pick up the wrong count | |
| 2298 int gc_count_before = SharedHeap::heap()->total_collections(); | |
| 2299 | |
| 2300 // Don't want to do a GC pause while cleanup is being completed! | |
| 2301 wait_for_cleanup_complete(); | |
| 2302 | |
| 2303 g1_policy()->record_stop_world_start(); | |
| 2304 { | |
| 2305 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
| 2306 VM_G1IncCollectionPause op(gc_count_before); | |
| 2307 VMThread::execute(&op); | |
| 2308 } | |
| 2309 } | |
| 2310 | |
| 2311 void | |
| 2312 G1CollectedHeap::doConcurrentMark() { | |
| 2313 if (G1ConcMark) { | |
| 2314 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); | |
| 2315 if (!_cmThread->in_progress()) { | |
| 2316 _cmThread->set_started(); | |
| 2317 CGC_lock->notify(); | |
| 2318 } | |
| 2319 } | |
| 2320 } | |
| 2321 | |
| 2322 class VerifyMarkedObjsClosure: public ObjectClosure { | |
| 2323 G1CollectedHeap* _g1h; | |
| 2324 public: | |
| 2325 VerifyMarkedObjsClosure(G1CollectedHeap* g1h) : _g1h(g1h) {} | |
| 2326 void do_object(oop obj) { | |
| 2327 assert(obj->mark()->is_marked() ? !_g1h->is_obj_dead(obj) : true, | |
| 2328 "markandsweep mark should agree with concurrent deadness"); | |
| 2329 } | |
| 2330 }; | |
| 2331 | |
| 2332 void | |
| 2333 G1CollectedHeap::checkConcurrentMark() { | |
| 2334 VerifyMarkedObjsClosure verifycl(this); | |
| 2335 // MutexLockerEx x(getMarkBitMapLock(), | |
| 2336 // Mutex::_no_safepoint_check_flag); | |
| 2337 object_iterate(&verifycl); | |
| 2338 } | |
| 2339 | |
| 2340 void G1CollectedHeap::do_sync_mark() { | |
| 2341 _cm->checkpointRootsInitial(); | |
| 2342 _cm->markFromRoots(); | |
| 2343 _cm->checkpointRootsFinal(false); | |
| 2344 } | |
| 2345 | |
| 2346 // <NEW PREDICTION> | |
| 2347 | |
| 2348 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
| 2349 bool young) { | |
| 2350 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
| 2351 } | |
| 2352 | |
| 2353 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
| 2354 predicted_time_ms) { | |
| 2355 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
| 2356 } | |
| 2357 | |
| 2358 size_t G1CollectedHeap::pending_card_num() { | |
| 2359 size_t extra_cards = 0; | |
| 2360 JavaThread *curr = Threads::first(); | |
| 2361 while (curr != NULL) { | |
| 2362 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
| 2363 extra_cards += dcq.size(); | |
| 2364 curr = curr->next(); | |
| 2365 } | |
| 2366 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 2367 size_t buffer_size = dcqs.buffer_size(); | |
| 2368 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 2369 return buffer_size * buffer_num + extra_cards; | |
| 2370 } | |
| 2371 | |
| 2372 size_t G1CollectedHeap::max_pending_card_num() { | |
| 2373 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 2374 size_t buffer_size = dcqs.buffer_size(); | |
| 2375 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 2376 int thread_num = Threads::number_of_threads(); | |
| 2377 return (buffer_num + thread_num) * buffer_size; | |
| 2378 } | |
| 2379 | |
| 2380 size_t G1CollectedHeap::cards_scanned() { | |
| 2381 HRInto_G1RemSet* g1_rset = (HRInto_G1RemSet*) g1_rem_set(); | |
| 2382 return g1_rset->cardsScanned(); | |
| 2383 } | |
| 2384 | |
| 2385 void | |
| 2386 G1CollectedHeap::setup_surviving_young_words() { | |
| 2387 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
| 2388 size_t array_length = g1_policy()->young_cset_length(); | |
| 2389 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); | |
| 2390 if (_surviving_young_words == NULL) { | |
| 2391 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
| 2392 "Not enough space for young surv words summary."); | |
| 2393 } | |
| 2394 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
| 2395 for (size_t i = 0; i < array_length; ++i) { | |
| 2396 guarantee( _surviving_young_words[i] == 0, "invariant" ); | |
| 2397 } | |
| 2398 } | |
| 2399 | |
| 2400 void | |
| 2401 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
| 2402 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 2403 size_t array_length = g1_policy()->young_cset_length(); | |
| 2404 for (size_t i = 0; i < array_length; ++i) | |
| 2405 _surviving_young_words[i] += surv_young_words[i]; | |
| 2406 } | |
| 2407 | |
| 2408 void | |
| 2409 G1CollectedHeap::cleanup_surviving_young_words() { | |
| 2410 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
| 2411 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
| 2412 _surviving_young_words = NULL; | |
| 2413 } | |
| 2414 | |
| 2415 // </NEW PREDICTION> | |
| 2416 | |
| 2417 void | |
| 2418 G1CollectedHeap::do_collection_pause_at_safepoint(HeapRegion* popular_region) { | |
| 2419 char verbose_str[128]; | |
| 2420 sprintf(verbose_str, "GC pause "); | |
| 2421 if (popular_region != NULL) | |
| 2422 strcat(verbose_str, "(popular)"); | |
| 2423 else if (g1_policy()->in_young_gc_mode()) { | |
| 2424 if (g1_policy()->full_young_gcs()) | |
| 2425 strcat(verbose_str, "(young)"); | |
| 2426 else | |
| 2427 strcat(verbose_str, "(partial)"); | |
| 2428 } | |
| 2429 bool reset_should_initiate_conc_mark = false; | |
| 2430 if (popular_region != NULL && g1_policy()->should_initiate_conc_mark()) { | |
| 2431 // we currently do not allow an initial mark phase to be piggy-backed | |
| 2432 // on a popular pause | |
| 2433 reset_should_initiate_conc_mark = true; | |
| 2434 g1_policy()->unset_should_initiate_conc_mark(); | |
| 2435 } | |
| 2436 if (g1_policy()->should_initiate_conc_mark()) | |
| 2437 strcat(verbose_str, " (initial-mark)"); | |
| 2438 | |
| 2439 GCCauseSetter x(this, (popular_region == NULL ? | |
| 2440 GCCause::_g1_inc_collection_pause : | |
| 2441 GCCause::_g1_pop_region_collection_pause)); | |
| 2442 | |
| 2443 // if PrintGCDetails is on, we'll print long statistics information | |
| 2444 // in the collector policy code, so let's not print this as the output | |
| 2445 // is messy if we do. | |
| 2446 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
| 2447 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
| 2448 TraceTime t(verbose_str, PrintGC && !PrintGCDetails, true, gclog_or_tty); | |
| 2449 | |
| 2450 ResourceMark rm; | |
| 2451 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
| 2452 assert(Thread::current() == VMThread::vm_thread(), "should be in vm thread"); | |
| 2453 guarantee(!is_gc_active(), "collection is not reentrant"); | |
| 2454 assert(regions_accounted_for(), "Region leakage!"); | |
|
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2455 |
|
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|
2456 increment_gc_time_stamp(); |
| 342 | 2457 |
| 2458 if (g1_policy()->in_young_gc_mode()) { | |
| 2459 assert(check_young_list_well_formed(), | |
| 2460 "young list should be well formed"); | |
| 2461 } | |
| 2462 | |
| 2463 if (GC_locker::is_active()) { | |
| 2464 return; // GC is disabled (e.g. JNI GetXXXCritical operation) | |
| 2465 } | |
| 2466 | |
| 2467 bool abandoned = false; | |
| 2468 { // Call to jvmpi::post_class_unload_events must occur outside of active GC | |
| 2469 IsGCActiveMark x; | |
| 2470 | |
| 2471 gc_prologue(false); | |
| 2472 increment_total_collections(); | |
| 2473 | |
| 2474 #if G1_REM_SET_LOGGING | |
| 2475 gclog_or_tty->print_cr("\nJust chose CS, heap:"); | |
| 2476 print(); | |
| 2477 #endif | |
| 2478 | |
| 2479 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
| 2480 HandleMark hm; // Discard invalid handles created during verification | |
| 2481 prepare_for_verify(); | |
| 2482 gclog_or_tty->print(" VerifyBeforeGC:"); | |
| 2483 Universe::verify(false); | |
| 2484 } | |
| 2485 | |
| 2486 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 2487 | |
|
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|
2488 // We want to turn off ref discovery, if necessary, and turn it back on |
| 342 | 2489 // on again later if we do. |
| 2490 bool was_enabled = ref_processor()->discovery_enabled(); | |
| 2491 if (was_enabled) ref_processor()->disable_discovery(); | |
| 2492 | |
| 2493 // Forget the current alloc region (we might even choose it to be part | |
| 2494 // of the collection set!). | |
| 2495 abandon_cur_alloc_region(); | |
| 2496 | |
| 2497 // The elapsed time induced by the start time below deliberately elides | |
| 2498 // the possible verification above. | |
| 2499 double start_time_sec = os::elapsedTime(); | |
| 2500 GCOverheadReporter::recordSTWStart(start_time_sec); | |
| 2501 size_t start_used_bytes = used(); | |
| 2502 if (!G1ConcMark) { | |
| 2503 do_sync_mark(); | |
| 2504 } | |
| 2505 | |
| 2506 g1_policy()->record_collection_pause_start(start_time_sec, | |
| 2507 start_used_bytes); | |
| 2508 | |
| 526 | 2509 guarantee(_in_cset_fast_test == NULL, "invariant"); |
| 2510 guarantee(_in_cset_fast_test_base == NULL, "invariant"); | |
|
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|
2511 _in_cset_fast_test_length = max_regions(); |
| 526 | 2512 _in_cset_fast_test_base = |
| 2513 NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); | |
| 2514 memset(_in_cset_fast_test_base, false, | |
| 2515 _in_cset_fast_test_length * sizeof(bool)); | |
| 2516 // We're biasing _in_cset_fast_test to avoid subtracting the | |
| 2517 // beginning of the heap every time we want to index; basically | |
| 2518 // it's the same with what we do with the card table. | |
| 2519 _in_cset_fast_test = _in_cset_fast_test_base - | |
| 2520 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); | |
| 2521 | |
| 342 | 2522 #if SCAN_ONLY_VERBOSE |
| 2523 _young_list->print(); | |
| 2524 #endif // SCAN_ONLY_VERBOSE | |
| 2525 | |
| 2526 if (g1_policy()->should_initiate_conc_mark()) { | |
| 2527 concurrent_mark()->checkpointRootsInitialPre(); | |
| 2528 } | |
| 2529 save_marks(); | |
| 2530 | |
| 2531 // We must do this before any possible evacuation that should propogate | |
| 2532 // marks, including evacuation of popular objects in a popular pause. | |
| 2533 if (mark_in_progress()) { | |
| 2534 double start_time_sec = os::elapsedTime(); | |
| 2535 | |
| 2536 _cm->drainAllSATBBuffers(); | |
| 2537 double finish_mark_ms = (os::elapsedTime() - start_time_sec) * 1000.0; | |
| 2538 g1_policy()->record_satb_drain_time(finish_mark_ms); | |
| 2539 | |
| 2540 } | |
| 2541 // Record the number of elements currently on the mark stack, so we | |
| 2542 // only iterate over these. (Since evacuation may add to the mark | |
| 2543 // stack, doing more exposes race conditions.) If no mark is in | |
| 2544 // progress, this will be zero. | |
| 2545 _cm->set_oops_do_bound(); | |
| 2546 | |
| 2547 assert(regions_accounted_for(), "Region leakage."); | |
| 2548 | |
| 2549 bool abandoned = false; | |
| 2550 | |
| 2551 if (mark_in_progress()) | |
| 2552 concurrent_mark()->newCSet(); | |
| 2553 | |
| 2554 // Now choose the CS. | |
| 2555 if (popular_region == NULL) { | |
| 2556 g1_policy()->choose_collection_set(); | |
| 2557 } else { | |
| 2558 // We may be evacuating a single region (for popularity). | |
| 2559 g1_policy()->record_popular_pause_preamble_start(); | |
| 2560 popularity_pause_preamble(popular_region); | |
| 2561 g1_policy()->record_popular_pause_preamble_end(); | |
| 2562 abandoned = (g1_policy()->collection_set() == NULL); | |
| 2563 // Now we allow more regions to be added (we have to collect | |
| 2564 // all popular regions). | |
| 2565 if (!abandoned) { | |
| 2566 g1_policy()->choose_collection_set(popular_region); | |
| 2567 } | |
| 2568 } | |
| 2569 // We may abandon a pause if we find no region that will fit in the MMU | |
| 2570 // pause. | |
| 2571 abandoned = (g1_policy()->collection_set() == NULL); | |
| 2572 | |
| 2573 // Nothing to do if we were unable to choose a collection set. | |
| 2574 if (!abandoned) { | |
| 2575 #if G1_REM_SET_LOGGING | |
| 2576 gclog_or_tty->print_cr("\nAfter pause, heap:"); | |
| 2577 print(); | |
| 2578 #endif | |
| 2579 | |
| 2580 setup_surviving_young_words(); | |
| 2581 | |
| 2582 // Set up the gc allocation regions. | |
| 2583 get_gc_alloc_regions(); | |
| 2584 | |
| 2585 // Actually do the work... | |
| 2586 evacuate_collection_set(); | |
| 2587 free_collection_set(g1_policy()->collection_set()); | |
| 2588 g1_policy()->clear_collection_set(); | |
| 2589 | |
| 526 | 2590 FREE_C_HEAP_ARRAY(bool, _in_cset_fast_test_base); |
| 2591 // this is more for peace of mind; we're nulling them here and | |
| 2592 // we're expecting them to be null at the beginning of the next GC | |
| 2593 _in_cset_fast_test = NULL; | |
| 2594 _in_cset_fast_test_base = NULL; | |
| 2595 | |
| 342 | 2596 if (popular_region != NULL) { |
| 2597 // We have to wait until now, because we don't want the region to | |
| 2598 // be rescheduled for pop-evac during RS update. | |
| 2599 popular_region->set_popular_pending(false); | |
| 2600 } | |
| 2601 | |
| 2602 release_gc_alloc_regions(); | |
| 2603 | |
| 2604 cleanup_surviving_young_words(); | |
| 2605 | |
| 2606 if (g1_policy()->in_young_gc_mode()) { | |
| 2607 _young_list->reset_sampled_info(); | |
| 2608 assert(check_young_list_empty(true), | |
| 2609 "young list should be empty"); | |
| 2610 | |
| 2611 #if SCAN_ONLY_VERBOSE | |
| 2612 _young_list->print(); | |
| 2613 #endif // SCAN_ONLY_VERBOSE | |
| 2614 | |
| 545 | 2615 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
| 2616 _young_list->first_survivor_region(), | |
| 2617 _young_list->last_survivor_region()); | |
| 342 | 2618 _young_list->reset_auxilary_lists(); |
| 2619 } | |
| 2620 } else { | |
| 2621 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 2622 } | |
| 2623 | |
| 2624 if (evacuation_failed()) { | |
| 2625 _summary_bytes_used = recalculate_used(); | |
| 2626 } else { | |
| 2627 // The "used" of the the collection set have already been subtracted | |
| 2628 // when they were freed. Add in the bytes evacuated. | |
| 2629 _summary_bytes_used += g1_policy()->bytes_in_to_space(); | |
| 2630 } | |
| 2631 | |
| 2632 if (g1_policy()->in_young_gc_mode() && | |
| 2633 g1_policy()->should_initiate_conc_mark()) { | |
| 2634 concurrent_mark()->checkpointRootsInitialPost(); | |
| 2635 set_marking_started(); | |
| 2636 doConcurrentMark(); | |
| 2637 } | |
| 2638 | |
| 2639 #if SCAN_ONLY_VERBOSE | |
| 2640 _young_list->print(); | |
| 2641 #endif // SCAN_ONLY_VERBOSE | |
| 2642 | |
| 2643 double end_time_sec = os::elapsedTime(); | |
|
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546
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|
2644 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
|
3698e8f47799
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|
2645 g1_policy()->record_pause_time_ms(pause_time_ms); |
| 342 | 2646 GCOverheadReporter::recordSTWEnd(end_time_sec); |
| 2647 g1_policy()->record_collection_pause_end(popular_region != NULL, | |
| 2648 abandoned); | |
| 2649 | |
| 2650 assert(regions_accounted_for(), "Region leakage."); | |
| 2651 | |
| 2652 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { | |
| 2653 HandleMark hm; // Discard invalid handles created during verification | |
| 2654 gclog_or_tty->print(" VerifyAfterGC:"); | |
| 2655 Universe::verify(false); | |
| 2656 } | |
| 2657 | |
| 2658 if (was_enabled) ref_processor()->enable_discovery(); | |
| 2659 | |
| 2660 { | |
| 2661 size_t expand_bytes = g1_policy()->expansion_amount(); | |
| 2662 if (expand_bytes > 0) { | |
| 2663 size_t bytes_before = capacity(); | |
| 2664 expand(expand_bytes); | |
| 2665 } | |
| 2666 } | |
| 2667 | |
|
546
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diff
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|
2668 if (mark_in_progress()) { |
| 342 | 2669 concurrent_mark()->update_g1_committed(); |
|
546
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diff
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|
2670 } |
|
05c6d52fa7a9
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diff
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|
2671 |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
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diff
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|
2672 #ifdef TRACESPINNING |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
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545
diff
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|
2673 ParallelTaskTerminator::print_termination_counts(); |
|
05c6d52fa7a9
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diff
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|
2674 #endif |
| 342 | 2675 |
| 2676 gc_epilogue(false); | |
| 2677 } | |
| 2678 | |
| 2679 assert(verify_region_lists(), "Bad region lists."); | |
| 2680 | |
| 2681 if (reset_should_initiate_conc_mark) | |
| 2682 g1_policy()->set_should_initiate_conc_mark(); | |
| 2683 | |
| 2684 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { | |
| 2685 gclog_or_tty->print_cr("Stopping after GC #%d", ExitAfterGCNum); | |
| 2686 print_tracing_info(); | |
| 2687 vm_exit(-1); | |
| 2688 } | |
| 2689 } | |
| 2690 | |
| 2691 void G1CollectedHeap::set_gc_alloc_region(int purpose, HeapRegion* r) { | |
| 2692 assert(purpose >= 0 && purpose < GCAllocPurposeCount, "invalid purpose"); | |
| 2693 HeapWord* original_top = NULL; | |
| 2694 if (r != NULL) | |
| 2695 original_top = r->top(); | |
| 2696 | |
| 2697 // We will want to record the used space in r as being there before gc. | |
| 2698 // One we install it as a GC alloc region it's eligible for allocation. | |
| 2699 // So record it now and use it later. | |
| 2700 size_t r_used = 0; | |
| 2701 if (r != NULL) { | |
| 2702 r_used = r->used(); | |
| 2703 | |
| 2704 if (ParallelGCThreads > 0) { | |
| 2705 // need to take the lock to guard against two threads calling | |
| 2706 // get_gc_alloc_region concurrently (very unlikely but...) | |
| 2707 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 2708 r->save_marks(); | |
| 2709 } | |
| 2710 } | |
| 2711 HeapRegion* old_alloc_region = _gc_alloc_regions[purpose]; | |
| 2712 _gc_alloc_regions[purpose] = r; | |
| 2713 if (old_alloc_region != NULL) { | |
| 2714 // Replace aliases too. | |
| 2715 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 2716 if (_gc_alloc_regions[ap] == old_alloc_region) { | |
| 2717 _gc_alloc_regions[ap] = r; | |
| 2718 } | |
| 2719 } | |
| 2720 } | |
| 2721 if (r != NULL) { | |
| 2722 push_gc_alloc_region(r); | |
| 2723 if (mark_in_progress() && original_top != r->next_top_at_mark_start()) { | |
| 2724 // We are using a region as a GC alloc region after it has been used | |
| 2725 // as a mutator allocation region during the current marking cycle. | |
| 2726 // The mutator-allocated objects are currently implicitly marked, but | |
| 2727 // when we move hr->next_top_at_mark_start() forward at the the end | |
| 2728 // of the GC pause, they won't be. We therefore mark all objects in | |
| 2729 // the "gap". We do this object-by-object, since marking densely | |
| 2730 // does not currently work right with marking bitmap iteration. This | |
| 2731 // means we rely on TLAB filling at the start of pauses, and no | |
| 2732 // "resuscitation" of filled TLAB's. If we want to do this, we need | |
| 2733 // to fix the marking bitmap iteration. | |
| 2734 HeapWord* curhw = r->next_top_at_mark_start(); | |
| 2735 HeapWord* t = original_top; | |
| 2736 | |
| 2737 while (curhw < t) { | |
| 2738 oop cur = (oop)curhw; | |
| 2739 // We'll assume parallel for generality. This is rare code. | |
| 2740 concurrent_mark()->markAndGrayObjectIfNecessary(cur); // can't we just mark them? | |
| 2741 curhw = curhw + cur->size(); | |
| 2742 } | |
| 2743 assert(curhw == t, "Should have parsed correctly."); | |
| 2744 } | |
| 2745 if (G1PolicyVerbose > 1) { | |
| 2746 gclog_or_tty->print("New alloc region ["PTR_FORMAT", "PTR_FORMAT", " PTR_FORMAT") " | |
| 2747 "for survivors:", r->bottom(), original_top, r->end()); | |
| 2748 r->print(); | |
| 2749 } | |
| 2750 g1_policy()->record_before_bytes(r_used); | |
| 2751 } | |
| 2752 } | |
| 2753 | |
| 2754 void G1CollectedHeap::push_gc_alloc_region(HeapRegion* hr) { | |
| 2755 assert(Thread::current()->is_VM_thread() || | |
| 2756 par_alloc_during_gc_lock()->owned_by_self(), "Precondition"); | |
| 2757 assert(!hr->is_gc_alloc_region() && !hr->in_collection_set(), | |
| 2758 "Precondition."); | |
| 2759 hr->set_is_gc_alloc_region(true); | |
| 2760 hr->set_next_gc_alloc_region(_gc_alloc_region_list); | |
| 2761 _gc_alloc_region_list = hr; | |
| 2762 } | |
| 2763 | |
| 2764 #ifdef G1_DEBUG | |
| 2765 class FindGCAllocRegion: public HeapRegionClosure { | |
| 2766 public: | |
| 2767 bool doHeapRegion(HeapRegion* r) { | |
| 2768 if (r->is_gc_alloc_region()) { | |
| 2769 gclog_or_tty->print_cr("Region %d ["PTR_FORMAT"...] is still a gc_alloc_region.", | |
| 2770 r->hrs_index(), r->bottom()); | |
| 2771 } | |
| 2772 return false; | |
| 2773 } | |
| 2774 }; | |
| 2775 #endif // G1_DEBUG | |
| 2776 | |
| 2777 void G1CollectedHeap::forget_alloc_region_list() { | |
| 2778 assert(Thread::current()->is_VM_thread(), "Precondition"); | |
| 2779 while (_gc_alloc_region_list != NULL) { | |
| 2780 HeapRegion* r = _gc_alloc_region_list; | |
| 2781 assert(r->is_gc_alloc_region(), "Invariant."); | |
| 2782 _gc_alloc_region_list = r->next_gc_alloc_region(); | |
| 2783 r->set_next_gc_alloc_region(NULL); | |
| 2784 r->set_is_gc_alloc_region(false); | |
| 545 | 2785 if (r->is_survivor()) { |
| 2786 if (r->is_empty()) { | |
| 2787 r->set_not_young(); | |
| 2788 } else { | |
| 2789 _young_list->add_survivor_region(r); | |
| 2790 } | |
| 2791 } | |
| 342 | 2792 if (r->is_empty()) { |
| 2793 ++_free_regions; | |
| 2794 } | |
| 2795 } | |
| 2796 #ifdef G1_DEBUG | |
| 2797 FindGCAllocRegion fa; | |
| 2798 heap_region_iterate(&fa); | |
| 2799 #endif // G1_DEBUG | |
| 2800 } | |
| 2801 | |
| 2802 | |
| 2803 bool G1CollectedHeap::check_gc_alloc_regions() { | |
| 2804 // TODO: allocation regions check | |
| 2805 return true; | |
| 2806 } | |
| 2807 | |
| 2808 void G1CollectedHeap::get_gc_alloc_regions() { | |
| 2809 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 2810 // Create new GC alloc regions. | |
| 2811 HeapRegion* alloc_region = _gc_alloc_regions[ap]; | |
| 2812 // Clear this alloc region, so that in case it turns out to be | |
| 2813 // unacceptable, we end up with no allocation region, rather than a bad | |
| 2814 // one. | |
| 2815 _gc_alloc_regions[ap] = NULL; | |
| 2816 if (alloc_region == NULL || alloc_region->in_collection_set()) { | |
| 2817 // Can't re-use old one. Allocate a new one. | |
| 2818 alloc_region = newAllocRegionWithExpansion(ap, 0); | |
| 2819 } | |
| 2820 if (alloc_region != NULL) { | |
| 2821 set_gc_alloc_region(ap, alloc_region); | |
| 2822 } | |
| 2823 } | |
| 2824 // Set alternative regions for allocation purposes that have reached | |
| 2825 // thier limit. | |
| 2826 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 2827 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(ap); | |
| 2828 if (_gc_alloc_regions[ap] == NULL && alt_purpose != ap) { | |
| 2829 _gc_alloc_regions[ap] = _gc_alloc_regions[alt_purpose]; | |
| 2830 } | |
| 2831 } | |
| 2832 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
| 2833 } | |
| 2834 | |
| 2835 void G1CollectedHeap::release_gc_alloc_regions() { | |
| 2836 // We keep a separate list of all regions that have been alloc regions in | |
| 2837 // the current collection pause. Forget that now. | |
| 2838 forget_alloc_region_list(); | |
| 2839 | |
| 2840 // The current alloc regions contain objs that have survived | |
| 2841 // collection. Make them no longer GC alloc regions. | |
| 2842 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 2843 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 2844 if (r != NULL && r->is_empty()) { | |
| 2845 { | |
| 2846 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 2847 r->set_zero_fill_complete(); | |
| 2848 put_free_region_on_list_locked(r); | |
| 2849 } | |
| 2850 } | |
| 2851 // set_gc_alloc_region will also NULLify all aliases to the region | |
| 2852 set_gc_alloc_region(ap, NULL); | |
| 2853 _gc_alloc_region_counts[ap] = 0; | |
| 2854 } | |
| 2855 } | |
| 2856 | |
| 2857 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
| 2858 _drain_in_progress = false; | |
| 2859 set_evac_failure_closure(cl); | |
| 2860 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 2861 } | |
| 2862 | |
| 2863 void G1CollectedHeap::finalize_for_evac_failure() { | |
| 2864 assert(_evac_failure_scan_stack != NULL && | |
| 2865 _evac_failure_scan_stack->length() == 0, | |
| 2866 "Postcondition"); | |
| 2867 assert(!_drain_in_progress, "Postcondition"); | |
| 2868 // Don't have to delete, since the scan stack is a resource object. | |
| 2869 _evac_failure_scan_stack = NULL; | |
| 2870 } | |
| 2871 | |
| 2872 | |
| 2873 | |
| 2874 // *** Sequential G1 Evacuation | |
| 2875 | |
| 2876 HeapWord* G1CollectedHeap::allocate_during_gc(GCAllocPurpose purpose, size_t word_size) { | |
| 2877 HeapRegion* alloc_region = _gc_alloc_regions[purpose]; | |
| 2878 // let the caller handle alloc failure | |
| 2879 if (alloc_region == NULL) return NULL; | |
| 2880 assert(isHumongous(word_size) || !alloc_region->isHumongous(), | |
| 2881 "Either the object is humongous or the region isn't"); | |
| 2882 HeapWord* block = alloc_region->allocate(word_size); | |
| 2883 if (block == NULL) { | |
| 2884 block = allocate_during_gc_slow(purpose, alloc_region, false, word_size); | |
| 2885 } | |
| 2886 return block; | |
| 2887 } | |
| 2888 | |
| 2889 class G1IsAliveClosure: public BoolObjectClosure { | |
| 2890 G1CollectedHeap* _g1; | |
| 2891 public: | |
| 2892 G1IsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
| 2893 void do_object(oop p) { assert(false, "Do not call."); } | |
| 2894 bool do_object_b(oop p) { | |
| 2895 // It is reachable if it is outside the collection set, or is inside | |
| 2896 // and forwarded. | |
| 2897 | |
| 2898 #ifdef G1_DEBUG | |
| 2899 gclog_or_tty->print_cr("is alive "PTR_FORMAT" in CS %d forwarded %d overall %d", | |
| 2900 (void*) p, _g1->obj_in_cs(p), p->is_forwarded(), | |
| 2901 !_g1->obj_in_cs(p) || p->is_forwarded()); | |
| 2902 #endif // G1_DEBUG | |
| 2903 | |
| 2904 return !_g1->obj_in_cs(p) || p->is_forwarded(); | |
| 2905 } | |
| 2906 }; | |
| 2907 | |
| 2908 class G1KeepAliveClosure: public OopClosure { | |
| 2909 G1CollectedHeap* _g1; | |
| 2910 public: | |
| 2911 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
| 2912 void do_oop(narrowOop* p) { | |
| 2913 guarantee(false, "NYI"); | |
| 2914 } | |
| 2915 void do_oop(oop* p) { | |
| 2916 oop obj = *p; | |
| 2917 #ifdef G1_DEBUG | |
| 2918 if (PrintGC && Verbose) { | |
| 2919 gclog_or_tty->print_cr("keep alive *"PTR_FORMAT" = "PTR_FORMAT" "PTR_FORMAT, | |
| 2920 p, (void*) obj, (void*) *p); | |
| 2921 } | |
| 2922 #endif // G1_DEBUG | |
| 2923 | |
| 2924 if (_g1->obj_in_cs(obj)) { | |
| 2925 assert( obj->is_forwarded(), "invariant" ); | |
| 2926 *p = obj->forwardee(); | |
| 2927 | |
| 2928 #ifdef G1_DEBUG | |
| 2929 gclog_or_tty->print_cr(" in CSet: moved "PTR_FORMAT" -> "PTR_FORMAT, | |
| 2930 (void*) obj, (void*) *p); | |
| 2931 #endif // G1_DEBUG | |
| 2932 } | |
| 2933 } | |
| 2934 }; | |
| 2935 | |
|
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2936 class UpdateRSetImmediate : public OopsInHeapRegionClosure { |
| 342 | 2937 private: |
| 2938 G1CollectedHeap* _g1; | |
| 2939 G1RemSet* _g1_rem_set; | |
| 2940 public: | |
|
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2941 UpdateRSetImmediate(G1CollectedHeap* g1) : |
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2942 _g1(g1), _g1_rem_set(g1->g1_rem_set()) {} |
| 342 | 2943 |
| 2944 void do_oop(narrowOop* p) { | |
| 2945 guarantee(false, "NYI"); | |
| 2946 } | |
| 2947 void do_oop(oop* p) { | |
| 2948 assert(_from->is_in_reserved(p), "paranoia"); | |
|
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2949 if (*p != NULL && !_from->is_survivor()) { |
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2950 _g1_rem_set->par_write_ref(_from, p, 0); |
| 342 | 2951 } |
| 2952 } | |
| 2953 }; | |
| 2954 | |
|
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2955 class UpdateRSetDeferred : public OopsInHeapRegionClosure { |
|
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2956 private: |
|
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2957 G1CollectedHeap* _g1; |
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2958 DirtyCardQueue *_dcq; |
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2959 CardTableModRefBS* _ct_bs; |
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2960 |
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2961 public: |
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2962 UpdateRSetDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
|
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2963 _g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) {} |
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2964 |
|
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2965 void do_oop(narrowOop* p) { |
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2966 guarantee(false, "NYI"); |
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2967 } |
|
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2968 void do_oop(oop* p) { |
|
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2969 assert(_from->is_in_reserved(p), "paranoia"); |
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2970 if (!_from->is_in_reserved(*p) && !_from->is_survivor()) { |
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2971 size_t card_index = _ct_bs->index_for(p); |
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2972 if (_ct_bs->mark_card_deferred(card_index)) { |
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2973 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
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2974 } |
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2975 } |
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2976 } |
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2977 }; |
|
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2978 |
|
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2979 |
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2980 |
| 342 | 2981 class RemoveSelfPointerClosure: public ObjectClosure { |
| 2982 private: | |
| 2983 G1CollectedHeap* _g1; | |
| 2984 ConcurrentMark* _cm; | |
| 2985 HeapRegion* _hr; | |
| 2986 size_t _prev_marked_bytes; | |
| 2987 size_t _next_marked_bytes; | |
|
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2988 OopsInHeapRegionClosure *_cl; |
| 342 | 2989 public: |
|
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2990 RemoveSelfPointerClosure(G1CollectedHeap* g1, OopsInHeapRegionClosure* cl) : |
|
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2991 _g1(g1), _cm(_g1->concurrent_mark()), _prev_marked_bytes(0), |
|
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2992 _next_marked_bytes(0), _cl(cl) {} |
| 342 | 2993 |
| 2994 size_t prev_marked_bytes() { return _prev_marked_bytes; } | |
| 2995 size_t next_marked_bytes() { return _next_marked_bytes; } | |
| 2996 | |
|
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2997 // The original idea here was to coalesce evacuated and dead objects. |
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2998 // However that caused complications with the block offset table (BOT). |
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2999 // In particular if there were two TLABs, one of them partially refined. |
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3000 // |----- TLAB_1--------|----TLAB_2-~~~(partially refined part)~~~| |
|
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3001 // The BOT entries of the unrefined part of TLAB_2 point to the start |
|
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3002 // of TLAB_2. If the last object of the TLAB_1 and the first object |
|
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3003 // of TLAB_2 are coalesced, then the cards of the unrefined part |
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3004 // would point into middle of the filler object. |
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3005 // |
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3006 // The current approach is to not coalesce and leave the BOT contents intact. |
|
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3007 void do_object(oop obj) { |
|
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3008 if (obj->is_forwarded() && obj->forwardee() == obj) { |
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3009 // The object failed to move. |
|
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3010 assert(!_g1->is_obj_dead(obj), "We should not be preserving dead objs."); |
|
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3011 _cm->markPrev(obj); |
|
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3012 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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3013 _prev_marked_bytes += (obj->size() * HeapWordSize); |
|
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3014 if (_g1->mark_in_progress() && !_g1->is_obj_ill(obj)) { |
|
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3015 _cm->markAndGrayObjectIfNecessary(obj); |
|
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3016 } |
|
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3017 obj->set_mark(markOopDesc::prototype()); |
|
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3018 // While we were processing RSet buffers during the |
|
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3019 // collection, we actually didn't scan any cards on the |
|
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3020 // collection set, since we didn't want to update remebered |
|
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3021 // sets with entries that point into the collection set, given |
|
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3022 // that live objects fromthe collection set are about to move |
|
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3023 // and such entries will be stale very soon. This change also |
|
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3024 // dealt with a reliability issue which involved scanning a |
|
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3025 // card in the collection set and coming across an array that |
|
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3026 // was being chunked and looking malformed. The problem is |
|
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3027 // that, if evacuation fails, we might have remembered set |
|
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3028 // entries missing given that we skipped cards on the |
|
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3029 // collection set. So, we'll recreate such entries now. |
|
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3030 obj->oop_iterate(_cl); |
|
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3031 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
|
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3032 } else { |
|
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3033 // The object has been either evacuated or is dead. Fill it with a |
|
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3034 // dummy object. |
|
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|
3035 MemRegion mr((HeapWord*)obj, obj->size()); |
|
481
7d7a7c599c17
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|
3036 CollectedHeap::fill_with_object(mr); |
| 342 | 3037 _cm->clearRangeBothMaps(mr); |
| 3038 } | |
| 3039 } | |
| 3040 }; | |
| 3041 | |
| 3042 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
|
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|
3043 UpdateRSetImmediate immediate_update(_g1h); |
|
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|
3044 DirtyCardQueue dcq(&_g1h->dirty_card_queue_set()); |
|
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|
3045 UpdateRSetDeferred deferred_update(_g1h, &dcq); |
|
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|
3046 OopsInHeapRegionClosure *cl; |
|
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|
3047 if (G1DeferredRSUpdate) { |
|
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|
3048 cl = &deferred_update; |
|
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|
3049 } else { |
|
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|
3050 cl = &immediate_update; |
|
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|
3051 } |
| 342 | 3052 HeapRegion* cur = g1_policy()->collection_set(); |
| 3053 while (cur != NULL) { | |
| 3054 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
| 3055 | |
|
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parents:
595
diff
changeset
|
3056 RemoveSelfPointerClosure rspc(_g1h, cl); |
| 342 | 3057 if (cur->evacuation_failed()) { |
| 3058 assert(cur->in_collection_set(), "bad CS"); | |
|
616
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parents:
595
diff
changeset
|
3059 cl->set_region(cur); |
| 342 | 3060 cur->object_iterate(&rspc); |
| 3061 | |
| 3062 // A number of manipulations to make the TAMS be the current top, | |
| 3063 // and the marked bytes be the ones observed in the iteration. | |
| 3064 if (_g1h->concurrent_mark()->at_least_one_mark_complete()) { | |
| 3065 // The comments below are the postconditions achieved by the | |
| 3066 // calls. Note especially the last such condition, which says that | |
| 3067 // the count of marked bytes has been properly restored. | |
| 3068 cur->note_start_of_marking(false); | |
| 3069 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
| 3070 cur->add_to_marked_bytes(rspc.prev_marked_bytes()); | |
| 3071 // _next_marked_bytes == prev_marked_bytes. | |
| 3072 cur->note_end_of_marking(); | |
| 3073 // _prev_top_at_mark_start == top(), | |
| 3074 // _prev_marked_bytes == prev_marked_bytes | |
| 3075 } | |
| 3076 // If there is no mark in progress, we modified the _next variables | |
| 3077 // above needlessly, but harmlessly. | |
| 3078 if (_g1h->mark_in_progress()) { | |
| 3079 cur->note_start_of_marking(false); | |
| 3080 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
| 3081 // _next_marked_bytes == next_marked_bytes. | |
| 3082 } | |
| 3083 | |
| 3084 // Now make sure the region has the right index in the sorted array. | |
| 3085 g1_policy()->note_change_in_marked_bytes(cur); | |
| 3086 } | |
| 3087 cur = cur->next_in_collection_set(); | |
| 3088 } | |
| 3089 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
| 3090 | |
| 3091 // Now restore saved marks, if any. | |
| 3092 if (_objs_with_preserved_marks != NULL) { | |
| 3093 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
| 3094 assert(_objs_with_preserved_marks->length() == | |
| 3095 _preserved_marks_of_objs->length(), "Both or none."); | |
| 3096 guarantee(_objs_with_preserved_marks->length() == | |
| 3097 _preserved_marks_of_objs->length(), "Both or none."); | |
| 3098 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
| 3099 oop obj = _objs_with_preserved_marks->at(i); | |
| 3100 markOop m = _preserved_marks_of_objs->at(i); | |
| 3101 obj->set_mark(m); | |
| 3102 } | |
| 3103 // Delete the preserved marks growable arrays (allocated on the C heap). | |
| 3104 delete _objs_with_preserved_marks; | |
| 3105 delete _preserved_marks_of_objs; | |
| 3106 _objs_with_preserved_marks = NULL; | |
| 3107 _preserved_marks_of_objs = NULL; | |
| 3108 } | |
| 3109 } | |
| 3110 | |
| 3111 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
| 3112 _evac_failure_scan_stack->push(obj); | |
| 3113 } | |
| 3114 | |
| 3115 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
| 3116 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
| 3117 | |
| 3118 while (_evac_failure_scan_stack->length() > 0) { | |
| 3119 oop obj = _evac_failure_scan_stack->pop(); | |
| 3120 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
| 3121 obj->oop_iterate_backwards(_evac_failure_closure); | |
| 3122 } | |
| 3123 } | |
| 3124 | |
| 3125 void G1CollectedHeap::handle_evacuation_failure(oop old) { | |
| 3126 markOop m = old->mark(); | |
| 3127 // forward to self | |
| 3128 assert(!old->is_forwarded(), "precondition"); | |
| 3129 | |
| 3130 old->forward_to(old); | |
| 3131 handle_evacuation_failure_common(old, m); | |
| 3132 } | |
| 3133 | |
| 3134 oop | |
| 3135 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
| 3136 oop old) { | |
| 3137 markOop m = old->mark(); | |
| 3138 oop forward_ptr = old->forward_to_atomic(old); | |
| 3139 if (forward_ptr == NULL) { | |
| 3140 // Forward-to-self succeeded. | |
| 3141 if (_evac_failure_closure != cl) { | |
| 3142 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
| 3143 assert(!_drain_in_progress, | |
| 3144 "Should only be true while someone holds the lock."); | |
| 3145 // Set the global evac-failure closure to the current thread's. | |
| 3146 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
| 3147 set_evac_failure_closure(cl); | |
| 3148 // Now do the common part. | |
| 3149 handle_evacuation_failure_common(old, m); | |
| 3150 // Reset to NULL. | |
| 3151 set_evac_failure_closure(NULL); | |
| 3152 } else { | |
| 3153 // The lock is already held, and this is recursive. | |
| 3154 assert(_drain_in_progress, "This should only be the recursive case."); | |
| 3155 handle_evacuation_failure_common(old, m); | |
| 3156 } | |
| 3157 return old; | |
| 3158 } else { | |
| 3159 // Someone else had a place to copy it. | |
| 3160 return forward_ptr; | |
| 3161 } | |
| 3162 } | |
| 3163 | |
| 3164 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
| 3165 set_evacuation_failed(true); | |
| 3166 | |
| 3167 preserve_mark_if_necessary(old, m); | |
| 3168 | |
| 3169 HeapRegion* r = heap_region_containing(old); | |
| 3170 if (!r->evacuation_failed()) { | |
| 3171 r->set_evacuation_failed(true); | |
| 3172 if (G1TraceRegions) { | |
| 3173 gclog_or_tty->print("evacuation failed in heap region "PTR_FORMAT" " | |
| 3174 "["PTR_FORMAT","PTR_FORMAT")\n", | |
| 3175 r, r->bottom(), r->end()); | |
| 3176 } | |
| 3177 } | |
| 3178 | |
| 3179 push_on_evac_failure_scan_stack(old); | |
| 3180 | |
| 3181 if (!_drain_in_progress) { | |
| 3182 // prevent recursion in copy_to_survivor_space() | |
| 3183 _drain_in_progress = true; | |
| 3184 drain_evac_failure_scan_stack(); | |
| 3185 _drain_in_progress = false; | |
| 3186 } | |
| 3187 } | |
| 3188 | |
| 3189 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
| 3190 if (m != markOopDesc::prototype()) { | |
| 3191 if (_objs_with_preserved_marks == NULL) { | |
| 3192 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
| 3193 _objs_with_preserved_marks = | |
| 3194 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 3195 _preserved_marks_of_objs = | |
| 3196 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
| 3197 } | |
| 3198 _objs_with_preserved_marks->push(obj); | |
| 3199 _preserved_marks_of_objs->push(m); | |
| 3200 } | |
| 3201 } | |
| 3202 | |
| 3203 // *** Parallel G1 Evacuation | |
| 3204 | |
| 3205 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
| 3206 size_t word_size) { | |
| 3207 HeapRegion* alloc_region = _gc_alloc_regions[purpose]; | |
| 3208 // let the caller handle alloc failure | |
| 3209 if (alloc_region == NULL) return NULL; | |
| 3210 | |
| 3211 HeapWord* block = alloc_region->par_allocate(word_size); | |
| 3212 if (block == NULL) { | |
| 3213 MutexLockerEx x(par_alloc_during_gc_lock(), | |
| 3214 Mutex::_no_safepoint_check_flag); | |
| 3215 block = allocate_during_gc_slow(purpose, alloc_region, true, word_size); | |
| 3216 } | |
| 3217 return block; | |
| 3218 } | |
| 3219 | |
| 545 | 3220 void G1CollectedHeap::retire_alloc_region(HeapRegion* alloc_region, |
| 3221 bool par) { | |
| 3222 // Another thread might have obtained alloc_region for the given | |
| 3223 // purpose, and might be attempting to allocate in it, and might | |
| 3224 // succeed. Therefore, we can't do the "finalization" stuff on the | |
| 3225 // region below until we're sure the last allocation has happened. | |
| 3226 // We ensure this by allocating the remaining space with a garbage | |
| 3227 // object. | |
| 3228 if (par) par_allocate_remaining_space(alloc_region); | |
| 3229 // Now we can do the post-GC stuff on the region. | |
| 3230 alloc_region->note_end_of_copying(); | |
| 3231 g1_policy()->record_after_bytes(alloc_region->used()); | |
| 3232 } | |
| 3233 | |
| 342 | 3234 HeapWord* |
| 3235 G1CollectedHeap::allocate_during_gc_slow(GCAllocPurpose purpose, | |
| 3236 HeapRegion* alloc_region, | |
| 3237 bool par, | |
| 3238 size_t word_size) { | |
| 3239 HeapWord* block = NULL; | |
| 3240 // In the parallel case, a previous thread to obtain the lock may have | |
| 3241 // already assigned a new gc_alloc_region. | |
| 3242 if (alloc_region != _gc_alloc_regions[purpose]) { | |
| 3243 assert(par, "But should only happen in parallel case."); | |
| 3244 alloc_region = _gc_alloc_regions[purpose]; | |
| 3245 if (alloc_region == NULL) return NULL; | |
| 3246 block = alloc_region->par_allocate(word_size); | |
| 3247 if (block != NULL) return block; | |
| 3248 // Otherwise, continue; this new region is empty, too. | |
| 3249 } | |
| 3250 assert(alloc_region != NULL, "We better have an allocation region"); | |
| 545 | 3251 retire_alloc_region(alloc_region, par); |
| 342 | 3252 |
| 3253 if (_gc_alloc_region_counts[purpose] >= g1_policy()->max_regions(purpose)) { | |
| 3254 // Cannot allocate more regions for the given purpose. | |
| 3255 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(purpose); | |
| 3256 // Is there an alternative? | |
| 3257 if (purpose != alt_purpose) { | |
| 3258 HeapRegion* alt_region = _gc_alloc_regions[alt_purpose]; | |
| 3259 // Has not the alternative region been aliased? | |
| 545 | 3260 if (alloc_region != alt_region && alt_region != NULL) { |
| 342 | 3261 // Try to allocate in the alternative region. |
| 3262 if (par) { | |
| 3263 block = alt_region->par_allocate(word_size); | |
| 3264 } else { | |
| 3265 block = alt_region->allocate(word_size); | |
| 3266 } | |
| 3267 // Make an alias. | |
| 3268 _gc_alloc_regions[purpose] = _gc_alloc_regions[alt_purpose]; | |
| 545 | 3269 if (block != NULL) { |
| 3270 return block; | |
| 3271 } | |
| 3272 retire_alloc_region(alt_region, par); | |
| 342 | 3273 } |
| 3274 // Both the allocation region and the alternative one are full | |
| 3275 // and aliased, replace them with a new allocation region. | |
| 3276 purpose = alt_purpose; | |
| 3277 } else { | |
| 3278 set_gc_alloc_region(purpose, NULL); | |
| 3279 return NULL; | |
| 3280 } | |
| 3281 } | |
| 3282 | |
| 3283 // Now allocate a new region for allocation. | |
| 3284 alloc_region = newAllocRegionWithExpansion(purpose, word_size, false /*zero_filled*/); | |
| 3285 | |
| 3286 // let the caller handle alloc failure | |
| 3287 if (alloc_region != NULL) { | |
| 3288 | |
| 3289 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
| 3290 assert(alloc_region->saved_mark_at_top(), | |
| 3291 "Mark should have been saved already."); | |
| 3292 // We used to assert that the region was zero-filled here, but no | |
| 3293 // longer. | |
| 3294 | |
| 3295 // This must be done last: once it's installed, other regions may | |
| 3296 // allocate in it (without holding the lock.) | |
| 3297 set_gc_alloc_region(purpose, alloc_region); | |
| 3298 | |
| 3299 if (par) { | |
| 3300 block = alloc_region->par_allocate(word_size); | |
| 3301 } else { | |
| 3302 block = alloc_region->allocate(word_size); | |
| 3303 } | |
| 3304 // Caller handles alloc failure. | |
| 3305 } else { | |
| 3306 // This sets other apis using the same old alloc region to NULL, also. | |
| 3307 set_gc_alloc_region(purpose, NULL); | |
| 3308 } | |
| 3309 return block; // May be NULL. | |
| 3310 } | |
| 3311 | |
| 3312 void G1CollectedHeap::par_allocate_remaining_space(HeapRegion* r) { | |
| 3313 HeapWord* block = NULL; | |
| 3314 size_t free_words; | |
| 3315 do { | |
| 3316 free_words = r->free()/HeapWordSize; | |
| 3317 // If there's too little space, no one can allocate, so we're done. | |
| 3318 if (free_words < (size_t)oopDesc::header_size()) return; | |
| 3319 // Otherwise, try to claim it. | |
| 3320 block = r->par_allocate(free_words); | |
| 3321 } while (block == NULL); | |
|
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parents:
457
diff
changeset
|
3322 fill_with_object(block, free_words); |
| 342 | 3323 } |
| 3324 | |
| 3325 #define use_local_bitmaps 1 | |
| 3326 #define verify_local_bitmaps 0 | |
| 3327 | |
| 3328 #ifndef PRODUCT | |
| 3329 | |
| 3330 class GCLabBitMap; | |
| 3331 class GCLabBitMapClosure: public BitMapClosure { | |
| 3332 private: | |
| 3333 ConcurrentMark* _cm; | |
| 3334 GCLabBitMap* _bitmap; | |
| 3335 | |
| 3336 public: | |
| 3337 GCLabBitMapClosure(ConcurrentMark* cm, | |
| 3338 GCLabBitMap* bitmap) { | |
| 3339 _cm = cm; | |
| 3340 _bitmap = bitmap; | |
| 3341 } | |
| 3342 | |
| 3343 virtual bool do_bit(size_t offset); | |
| 3344 }; | |
| 3345 | |
| 3346 #endif // PRODUCT | |
| 3347 | |
| 3348 #define oop_buffer_length 256 | |
| 3349 | |
| 3350 class GCLabBitMap: public BitMap { | |
| 3351 private: | |
| 3352 ConcurrentMark* _cm; | |
| 3353 | |
| 3354 int _shifter; | |
| 3355 size_t _bitmap_word_covers_words; | |
| 3356 | |
| 3357 // beginning of the heap | |
| 3358 HeapWord* _heap_start; | |
| 3359 | |
| 3360 // this is the actual start of the GCLab | |
| 3361 HeapWord* _real_start_word; | |
| 3362 | |
| 3363 // this is the actual end of the GCLab | |
| 3364 HeapWord* _real_end_word; | |
| 3365 | |
| 3366 // this is the first word, possibly located before the actual start | |
| 3367 // of the GCLab, that corresponds to the first bit of the bitmap | |
| 3368 HeapWord* _start_word; | |
| 3369 | |
| 3370 // size of a GCLab in words | |
| 3371 size_t _gclab_word_size; | |
| 3372 | |
| 3373 static int shifter() { | |
| 3374 return MinObjAlignment - 1; | |
| 3375 } | |
| 3376 | |
| 3377 // how many heap words does a single bitmap word corresponds to? | |
| 3378 static size_t bitmap_word_covers_words() { | |
| 3379 return BitsPerWord << shifter(); | |
| 3380 } | |
| 3381 | |
| 3382 static size_t gclab_word_size() { | |
| 3383 return ParallelGCG1AllocBufferSize / HeapWordSize; | |
| 3384 } | |
| 3385 | |
| 3386 static size_t bitmap_size_in_bits() { | |
| 3387 size_t bits_in_bitmap = gclab_word_size() >> shifter(); | |
| 3388 // We are going to ensure that the beginning of a word in this | |
| 3389 // bitmap also corresponds to the beginning of a word in the | |
| 3390 // global marking bitmap. To handle the case where a GCLab | |
| 3391 // starts from the middle of the bitmap, we need to add enough | |
| 3392 // space (i.e. up to a bitmap word) to ensure that we have | |
| 3393 // enough bits in the bitmap. | |
| 3394 return bits_in_bitmap + BitsPerWord - 1; | |
| 3395 } | |
| 3396 public: | |
| 3397 GCLabBitMap(HeapWord* heap_start) | |
| 3398 : BitMap(bitmap_size_in_bits()), | |
| 3399 _cm(G1CollectedHeap::heap()->concurrent_mark()), | |
| 3400 _shifter(shifter()), | |
| 3401 _bitmap_word_covers_words(bitmap_word_covers_words()), | |
| 3402 _heap_start(heap_start), | |
| 3403 _gclab_word_size(gclab_word_size()), | |
| 3404 _real_start_word(NULL), | |
| 3405 _real_end_word(NULL), | |
| 3406 _start_word(NULL) | |
| 3407 { | |
| 3408 guarantee( size_in_words() >= bitmap_size_in_words(), | |
| 3409 "just making sure"); | |
| 3410 } | |
| 3411 | |
| 3412 inline unsigned heapWordToOffset(HeapWord* addr) { | |
| 3413 unsigned offset = (unsigned) pointer_delta(addr, _start_word) >> _shifter; | |
| 3414 assert(offset < size(), "offset should be within bounds"); | |
| 3415 return offset; | |
| 3416 } | |
| 3417 | |
| 3418 inline HeapWord* offsetToHeapWord(size_t offset) { | |
| 3419 HeapWord* addr = _start_word + (offset << _shifter); | |
| 3420 assert(_real_start_word <= addr && addr < _real_end_word, "invariant"); | |
| 3421 return addr; | |
| 3422 } | |
| 3423 | |
| 3424 bool fields_well_formed() { | |
| 3425 bool ret1 = (_real_start_word == NULL) && | |
| 3426 (_real_end_word == NULL) && | |
| 3427 (_start_word == NULL); | |
| 3428 if (ret1) | |
| 3429 return true; | |
| 3430 | |
| 3431 bool ret2 = _real_start_word >= _start_word && | |
| 3432 _start_word < _real_end_word && | |
| 3433 (_real_start_word + _gclab_word_size) == _real_end_word && | |
| 3434 (_start_word + _gclab_word_size + _bitmap_word_covers_words) | |
| 3435 > _real_end_word; | |
| 3436 return ret2; | |
| 3437 } | |
| 3438 | |
| 3439 inline bool mark(HeapWord* addr) { | |
| 3440 guarantee(use_local_bitmaps, "invariant"); | |
| 3441 assert(fields_well_formed(), "invariant"); | |
| 3442 | |
| 3443 if (addr >= _real_start_word && addr < _real_end_word) { | |
| 3444 assert(!isMarked(addr), "should not have already been marked"); | |
| 3445 | |
| 3446 // first mark it on the bitmap | |
| 3447 at_put(heapWordToOffset(addr), true); | |
| 3448 | |
| 3449 return true; | |
| 3450 } else { | |
| 3451 return false; | |
| 3452 } | |
| 3453 } | |
| 3454 | |
| 3455 inline bool isMarked(HeapWord* addr) { | |
| 3456 guarantee(use_local_bitmaps, "invariant"); | |
| 3457 assert(fields_well_formed(), "invariant"); | |
| 3458 | |
| 3459 return at(heapWordToOffset(addr)); | |
| 3460 } | |
| 3461 | |
| 3462 void set_buffer(HeapWord* start) { | |
| 3463 guarantee(use_local_bitmaps, "invariant"); | |
| 3464 clear(); | |
| 3465 | |
| 3466 assert(start != NULL, "invariant"); | |
| 3467 _real_start_word = start; | |
| 3468 _real_end_word = start + _gclab_word_size; | |
| 3469 | |
| 3470 size_t diff = | |
| 3471 pointer_delta(start, _heap_start) % _bitmap_word_covers_words; | |
| 3472 _start_word = start - diff; | |
| 3473 | |
| 3474 assert(fields_well_formed(), "invariant"); | |
| 3475 } | |
| 3476 | |
| 3477 #ifndef PRODUCT | |
| 3478 void verify() { | |
| 3479 // verify that the marks have been propagated | |
| 3480 GCLabBitMapClosure cl(_cm, this); | |
| 3481 iterate(&cl); | |
| 3482 } | |
| 3483 #endif // PRODUCT | |
| 3484 | |
| 3485 void retire() { | |
| 3486 guarantee(use_local_bitmaps, "invariant"); | |
| 3487 assert(fields_well_formed(), "invariant"); | |
| 3488 | |
| 3489 if (_start_word != NULL) { | |
| 3490 CMBitMap* mark_bitmap = _cm->nextMarkBitMap(); | |
| 3491 | |
| 3492 // this means that the bitmap was set up for the GCLab | |
| 3493 assert(_real_start_word != NULL && _real_end_word != NULL, "invariant"); | |
| 3494 | |
| 3495 mark_bitmap->mostly_disjoint_range_union(this, | |
| 3496 0, // always start from the start of the bitmap | |
| 3497 _start_word, | |
| 3498 size_in_words()); | |
| 3499 _cm->grayRegionIfNecessary(MemRegion(_real_start_word, _real_end_word)); | |
| 3500 | |
| 3501 #ifndef PRODUCT | |
| 3502 if (use_local_bitmaps && verify_local_bitmaps) | |
| 3503 verify(); | |
| 3504 #endif // PRODUCT | |
| 3505 } else { | |
| 3506 assert(_real_start_word == NULL && _real_end_word == NULL, "invariant"); | |
| 3507 } | |
| 3508 } | |
| 3509 | |
| 3510 static size_t bitmap_size_in_words() { | |
| 3511 return (bitmap_size_in_bits() + BitsPerWord - 1) / BitsPerWord; | |
| 3512 } | |
| 3513 }; | |
| 3514 | |
| 3515 #ifndef PRODUCT | |
| 3516 | |
| 3517 bool GCLabBitMapClosure::do_bit(size_t offset) { | |
| 3518 HeapWord* addr = _bitmap->offsetToHeapWord(offset); | |
| 3519 guarantee(_cm->isMarked(oop(addr)), "it should be!"); | |
| 3520 return true; | |
| 3521 } | |
| 3522 | |
| 3523 #endif // PRODUCT | |
| 3524 | |
| 3525 class G1ParGCAllocBuffer: public ParGCAllocBuffer { | |
| 3526 private: | |
| 3527 bool _retired; | |
| 3528 bool _during_marking; | |
| 3529 GCLabBitMap _bitmap; | |
| 3530 | |
| 3531 public: | |
| 3532 G1ParGCAllocBuffer() : | |
| 3533 ParGCAllocBuffer(ParallelGCG1AllocBufferSize / HeapWordSize), | |
| 3534 _during_marking(G1CollectedHeap::heap()->mark_in_progress()), | |
| 3535 _bitmap(G1CollectedHeap::heap()->reserved_region().start()), | |
| 3536 _retired(false) | |
| 3537 { } | |
| 3538 | |
| 3539 inline bool mark(HeapWord* addr) { | |
| 3540 guarantee(use_local_bitmaps, "invariant"); | |
| 3541 assert(_during_marking, "invariant"); | |
| 3542 return _bitmap.mark(addr); | |
| 3543 } | |
| 3544 | |
| 3545 inline void set_buf(HeapWord* buf) { | |
| 3546 if (use_local_bitmaps && _during_marking) | |
| 3547 _bitmap.set_buffer(buf); | |
| 3548 ParGCAllocBuffer::set_buf(buf); | |
| 3549 _retired = false; | |
| 3550 } | |
| 3551 | |
| 3552 inline void retire(bool end_of_gc, bool retain) { | |
| 3553 if (_retired) | |
| 3554 return; | |
| 3555 if (use_local_bitmaps && _during_marking) { | |
| 3556 _bitmap.retire(); | |
| 3557 } | |
| 3558 ParGCAllocBuffer::retire(end_of_gc, retain); | |
| 3559 _retired = true; | |
| 3560 } | |
| 3561 }; | |
| 3562 | |
| 3563 | |
| 3564 class G1ParScanThreadState : public StackObj { | |
| 3565 protected: | |
| 3566 G1CollectedHeap* _g1h; | |
| 3567 RefToScanQueue* _refs; | |
|
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3568 DirtyCardQueue _dcq; |
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3569 CardTableModRefBS* _ct_bs; |
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3570 G1RemSet* _g1_rem; |
| 342 | 3571 |
| 3572 typedef GrowableArray<oop*> OverflowQueue; | |
| 3573 OverflowQueue* _overflowed_refs; | |
| 3574 | |
| 3575 G1ParGCAllocBuffer _alloc_buffers[GCAllocPurposeCount]; | |
| 545 | 3576 ageTable _age_table; |
| 342 | 3577 |
| 3578 size_t _alloc_buffer_waste; | |
| 3579 size_t _undo_waste; | |
| 3580 | |
| 3581 OopsInHeapRegionClosure* _evac_failure_cl; | |
| 3582 G1ParScanHeapEvacClosure* _evac_cl; | |
| 3583 G1ParScanPartialArrayClosure* _partial_scan_cl; | |
| 3584 | |
| 3585 int _hash_seed; | |
| 3586 int _queue_num; | |
| 3587 | |
| 3588 int _term_attempts; | |
| 3589 #if G1_DETAILED_STATS | |
| 3590 int _pushes, _pops, _steals, _steal_attempts; | |
| 3591 int _overflow_pushes; | |
| 3592 #endif | |
| 3593 | |
| 3594 double _start; | |
| 3595 double _start_strong_roots; | |
| 3596 double _strong_roots_time; | |
| 3597 double _start_term; | |
| 3598 double _term_time; | |
| 3599 | |
| 3600 // Map from young-age-index (0 == not young, 1 is youngest) to | |
| 3601 // surviving words. base is what we get back from the malloc call | |
| 3602 size_t* _surviving_young_words_base; | |
| 3603 // this points into the array, as we use the first few entries for padding | |
| 3604 size_t* _surviving_young_words; | |
| 3605 | |
| 3606 #define PADDING_ELEM_NUM (64 / sizeof(size_t)) | |
| 3607 | |
| 3608 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } | |
| 3609 | |
| 3610 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } | |
| 3611 | |
|
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3612 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
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3613 CardTableModRefBS* ctbs() { return _ct_bs; } |
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3614 |
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3615 void immediate_rs_update(HeapRegion* from, oop* p, int tid) { |
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3616 _g1_rem->par_write_ref(from, p, tid); |
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3617 } |
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3618 |
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3619 void deferred_rs_update(HeapRegion* from, oop* p, int tid) { |
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3620 // If the new value of the field points to the same region or |
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3621 // is the to-space, we don't need to include it in the Rset updates. |
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3622 if (!from->is_in_reserved(*p) && !from->is_survivor()) { |
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3623 size_t card_index = ctbs()->index_for(p); |
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3624 // If the card hasn't been added to the buffer, do it. |
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3625 if (ctbs()->mark_card_deferred(card_index)) { |
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3626 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
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3627 } |
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3628 } |
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3629 } |
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3630 |
| 342 | 3631 public: |
| 3632 G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) | |
| 3633 : _g1h(g1h), | |
| 3634 _refs(g1h->task_queue(queue_num)), | |
|
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3635 _dcq(&g1h->dirty_card_queue_set()), |
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3636 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
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3637 _g1_rem(g1h->g1_rem_set()), |
| 342 | 3638 _hash_seed(17), _queue_num(queue_num), |
| 3639 _term_attempts(0), | |
| 545 | 3640 _age_table(false), |
| 342 | 3641 #if G1_DETAILED_STATS |
| 3642 _pushes(0), _pops(0), _steals(0), | |
| 3643 _steal_attempts(0), _overflow_pushes(0), | |
| 3644 #endif | |
| 3645 _strong_roots_time(0), _term_time(0), | |
| 3646 _alloc_buffer_waste(0), _undo_waste(0) | |
| 3647 { | |
| 3648 // we allocate G1YoungSurvRateNumRegions plus one entries, since | |
| 3649 // we "sacrifice" entry 0 to keep track of surviving bytes for | |
| 3650 // non-young regions (where the age is -1) | |
| 3651 // We also add a few elements at the beginning and at the end in | |
| 3652 // an attempt to eliminate cache contention | |
| 3653 size_t real_length = 1 + _g1h->g1_policy()->young_cset_length(); | |
| 3654 size_t array_length = PADDING_ELEM_NUM + | |
| 3655 real_length + | |
| 3656 PADDING_ELEM_NUM; | |
| 3657 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); | |
| 3658 if (_surviving_young_words_base == NULL) | |
| 3659 vm_exit_out_of_memory(array_length * sizeof(size_t), | |
| 3660 "Not enough space for young surv histo."); | |
| 3661 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; | |
| 3662 memset(_surviving_young_words, 0, real_length * sizeof(size_t)); | |
| 3663 | |
| 3664 _overflowed_refs = new OverflowQueue(10); | |
| 3665 | |
| 3666 _start = os::elapsedTime(); | |
| 3667 } | |
| 3668 | |
| 3669 ~G1ParScanThreadState() { | |
| 3670 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base); | |
| 3671 } | |
| 3672 | |
| 3673 RefToScanQueue* refs() { return _refs; } | |
| 3674 OverflowQueue* overflowed_refs() { return _overflowed_refs; } | |
| 545 | 3675 ageTable* age_table() { return &_age_table; } |
| 3676 | |
| 3677 G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) { | |
| 342 | 3678 return &_alloc_buffers[purpose]; |
| 3679 } | |
| 3680 | |
| 3681 size_t alloc_buffer_waste() { return _alloc_buffer_waste; } | |
| 3682 size_t undo_waste() { return _undo_waste; } | |
| 3683 | |
| 3684 void push_on_queue(oop* ref) { | |
| 526 | 3685 assert(ref != NULL, "invariant"); |
| 3686 assert(has_partial_array_mask(ref) || _g1h->obj_in_cs(*ref), "invariant"); | |
| 3687 | |
| 342 | 3688 if (!refs()->push(ref)) { |
| 3689 overflowed_refs()->push(ref); | |
| 3690 IF_G1_DETAILED_STATS(note_overflow_push()); | |
| 3691 } else { | |
| 3692 IF_G1_DETAILED_STATS(note_push()); | |
| 3693 } | |
| 3694 } | |
| 3695 | |
| 3696 void pop_from_queue(oop*& ref) { | |
| 3697 if (!refs()->pop_local(ref)) { | |
| 3698 ref = NULL; | |
| 3699 } else { | |
| 526 | 3700 assert(ref != NULL, "invariant"); |
| 3701 assert(has_partial_array_mask(ref) || _g1h->obj_in_cs(*ref), | |
| 3702 "invariant"); | |
| 3703 | |
| 342 | 3704 IF_G1_DETAILED_STATS(note_pop()); |
| 3705 } | |
| 3706 } | |
| 3707 | |
| 3708 void pop_from_overflow_queue(oop*& ref) { | |
| 3709 ref = overflowed_refs()->pop(); | |
| 3710 } | |
| 3711 | |
| 3712 int refs_to_scan() { return refs()->size(); } | |
| 3713 int overflowed_refs_to_scan() { return overflowed_refs()->length(); } | |
| 3714 | |
|
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3715 void update_rs(HeapRegion* from, oop* p, int tid) { |
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3716 if (G1DeferredRSUpdate) { |
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3717 deferred_rs_update(from, p, tid); |
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3718 } else { |
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3719 immediate_rs_update(from, p, tid); |
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3720 } |
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3721 } |
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3722 |
| 342 | 3723 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
| 3724 | |
| 3725 HeapWord* obj = NULL; | |
| 3726 if (word_sz * 100 < | |
| 3727 (size_t)(ParallelGCG1AllocBufferSize / HeapWordSize) * | |
| 3728 ParallelGCBufferWastePct) { | |
| 3729 G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose); | |
| 3730 add_to_alloc_buffer_waste(alloc_buf->words_remaining()); | |
| 3731 alloc_buf->retire(false, false); | |
| 3732 | |
| 3733 HeapWord* buf = | |
| 3734 _g1h->par_allocate_during_gc(purpose, ParallelGCG1AllocBufferSize / HeapWordSize); | |
| 3735 if (buf == NULL) return NULL; // Let caller handle allocation failure. | |
| 3736 // Otherwise. | |
| 3737 alloc_buf->set_buf(buf); | |
| 3738 | |
| 3739 obj = alloc_buf->allocate(word_sz); | |
| 3740 assert(obj != NULL, "buffer was definitely big enough..."); | |
| 526 | 3741 } else { |
| 342 | 3742 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
| 3743 } | |
| 3744 return obj; | |
| 3745 } | |
| 3746 | |
| 3747 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { | |
| 3748 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); | |
| 3749 if (obj != NULL) return obj; | |
| 3750 return allocate_slow(purpose, word_sz); | |
| 3751 } | |
| 3752 | |
| 3753 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { | |
| 3754 if (alloc_buffer(purpose)->contains(obj)) { | |
| 3755 guarantee(alloc_buffer(purpose)->contains(obj + word_sz - 1), | |
| 3756 "should contain whole object"); | |
| 3757 alloc_buffer(purpose)->undo_allocation(obj, word_sz); | |
|
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3758 } else { |
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3759 CollectedHeap::fill_with_object(obj, word_sz); |
| 342 | 3760 add_to_undo_waste(word_sz); |
| 3761 } | |
| 3762 } | |
| 3763 | |
| 3764 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { | |
| 3765 _evac_failure_cl = evac_failure_cl; | |
| 3766 } | |
| 3767 OopsInHeapRegionClosure* evac_failure_closure() { | |
| 3768 return _evac_failure_cl; | |
| 3769 } | |
| 3770 | |
| 3771 void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) { | |
| 3772 _evac_cl = evac_cl; | |
| 3773 } | |
| 3774 | |
| 3775 void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) { | |
| 3776 _partial_scan_cl = partial_scan_cl; | |
| 3777 } | |
| 3778 | |
| 3779 int* hash_seed() { return &_hash_seed; } | |
| 3780 int queue_num() { return _queue_num; } | |
| 3781 | |
| 3782 int term_attempts() { return _term_attempts; } | |
| 3783 void note_term_attempt() { _term_attempts++; } | |
| 3784 | |
| 3785 #if G1_DETAILED_STATS | |
| 3786 int pushes() { return _pushes; } | |
| 3787 int pops() { return _pops; } | |
| 3788 int steals() { return _steals; } | |
| 3789 int steal_attempts() { return _steal_attempts; } | |
| 3790 int overflow_pushes() { return _overflow_pushes; } | |
| 3791 | |
| 3792 void note_push() { _pushes++; } | |
| 3793 void note_pop() { _pops++; } | |
| 3794 void note_steal() { _steals++; } | |
| 3795 void note_steal_attempt() { _steal_attempts++; } | |
| 3796 void note_overflow_push() { _overflow_pushes++; } | |
| 3797 #endif | |
| 3798 | |
| 3799 void start_strong_roots() { | |
| 3800 _start_strong_roots = os::elapsedTime(); | |
| 3801 } | |
| 3802 void end_strong_roots() { | |
| 3803 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); | |
| 3804 } | |
| 3805 double strong_roots_time() { return _strong_roots_time; } | |
| 3806 | |
| 3807 void start_term_time() { | |
| 3808 note_term_attempt(); | |
| 3809 _start_term = os::elapsedTime(); | |
| 3810 } | |
| 3811 void end_term_time() { | |
| 3812 _term_time += (os::elapsedTime() - _start_term); | |
| 3813 } | |
| 3814 double term_time() { return _term_time; } | |
| 3815 | |
| 3816 double elapsed() { | |
| 3817 return os::elapsedTime() - _start; | |
| 3818 } | |
| 3819 | |
| 3820 size_t* surviving_young_words() { | |
| 3821 // We add on to hide entry 0 which accumulates surviving words for | |
| 3822 // age -1 regions (i.e. non-young ones) | |
| 3823 return _surviving_young_words; | |
| 3824 } | |
| 3825 | |
| 3826 void retire_alloc_buffers() { | |
| 3827 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 3828 size_t waste = _alloc_buffers[ap].words_remaining(); | |
| 3829 add_to_alloc_buffer_waste(waste); | |
| 3830 _alloc_buffers[ap].retire(true, false); | |
| 3831 } | |
| 3832 } | |
| 3833 | |
| 526 | 3834 private: |
| 3835 void deal_with_reference(oop* ref_to_scan) { | |
| 3836 if (has_partial_array_mask(ref_to_scan)) { | |
| 3837 _partial_scan_cl->do_oop_nv(ref_to_scan); | |
| 3838 } else { | |
| 3839 // Note: we can use "raw" versions of "region_containing" because | |
| 3840 // "obj_to_scan" is definitely in the heap, and is not in a | |
| 3841 // humongous region. | |
| 3842 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); | |
| 3843 _evac_cl->set_region(r); | |
| 3844 _evac_cl->do_oop_nv(ref_to_scan); | |
| 3845 } | |
| 3846 } | |
| 3847 | |
| 3848 public: | |
| 342 | 3849 void trim_queue() { |
| 526 | 3850 // I've replicated the loop twice, first to drain the overflow |
| 3851 // queue, second to drain the task queue. This is better than | |
| 3852 // having a single loop, which checks both conditions and, inside | |
| 3853 // it, either pops the overflow queue or the task queue, as each | |
| 3854 // loop is tighter. Also, the decision to drain the overflow queue | |
| 3855 // first is not arbitrary, as the overflow queue is not visible | |
| 3856 // to the other workers, whereas the task queue is. So, we want to | |
| 3857 // drain the "invisible" entries first, while allowing the other | |
| 3858 // workers to potentially steal the "visible" entries. | |
| 3859 | |
| 342 | 3860 while (refs_to_scan() > 0 || overflowed_refs_to_scan() > 0) { |
| 526 | 3861 while (overflowed_refs_to_scan() > 0) { |
| 3862 oop *ref_to_scan = NULL; | |
| 342 | 3863 pop_from_overflow_queue(ref_to_scan); |
| 526 | 3864 assert(ref_to_scan != NULL, "invariant"); |
| 3865 // We shouldn't have pushed it on the queue if it was not | |
| 3866 // pointing into the CSet. | |
| 3867 assert(ref_to_scan != NULL, "sanity"); | |
| 3868 assert(has_partial_array_mask(ref_to_scan) || | |
| 3869 _g1h->obj_in_cs(*ref_to_scan), "sanity"); | |
| 3870 | |
| 3871 deal_with_reference(ref_to_scan); | |
| 342 | 3872 } |
| 526 | 3873 |
| 3874 while (refs_to_scan() > 0) { | |
| 3875 oop *ref_to_scan = NULL; | |
| 3876 pop_from_queue(ref_to_scan); | |
| 3877 | |
| 3878 if (ref_to_scan != NULL) { | |
| 3879 // We shouldn't have pushed it on the queue if it was not | |
| 3880 // pointing into the CSet. | |
| 3881 assert(has_partial_array_mask(ref_to_scan) || | |
| 3882 _g1h->obj_in_cs(*ref_to_scan), "sanity"); | |
| 3883 | |
| 3884 deal_with_reference(ref_to_scan); | |
| 342 | 3885 } |
| 3886 } | |
| 3887 } | |
| 3888 } | |
| 3889 }; | |
| 3890 | |
| 3891 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : | |
| 3892 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), | |
| 3893 _par_scan_state(par_scan_state) { } | |
| 3894 | |
| 3895 // This closure is applied to the fields of the objects that have just been copied. | |
| 3896 // Should probably be made inline and moved in g1OopClosures.inline.hpp. | |
| 3897 void G1ParScanClosure::do_oop_nv(oop* p) { | |
| 3898 oop obj = *p; | |
| 526 | 3899 |
| 342 | 3900 if (obj != NULL) { |
| 526 | 3901 if (_g1->in_cset_fast_test(obj)) { |
| 3902 // We're not going to even bother checking whether the object is | |
| 3903 // already forwarded or not, as this usually causes an immediate | |
| 3904 // stall. We'll try to prefetch the object (for write, given that | |
| 3905 // we might need to install the forwarding reference) and we'll | |
| 3906 // get back to it when pop it from the queue | |
| 3907 Prefetch::write(obj->mark_addr(), 0); | |
| 3908 Prefetch::read(obj->mark_addr(), (HeapWordSize*2)); | |
| 3909 | |
| 3910 // slightly paranoid test; I'm trying to catch potential | |
| 3911 // problems before we go into push_on_queue to know where the | |
| 3912 // problem is coming from | |
| 3913 assert(obj == *p, "the value of *p should not have changed"); | |
| 3914 _par_scan_state->push_on_queue(p); | |
| 3915 } else { | |
|
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3916 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 342 | 3917 } |
| 3918 } | |
| 3919 } | |
| 3920 | |
| 3921 void G1ParCopyHelper::mark_forwardee(oop* p) { | |
| 3922 // This is called _after_ do_oop_work has been called, hence after | |
| 3923 // the object has been relocated to its new location and *p points | |
| 3924 // to its new location. | |
| 3925 | |
| 3926 oop thisOop = *p; | |
| 3927 if (thisOop != NULL) { | |
| 3928 assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(thisOop)), | |
| 3929 "shouldn't still be in the CSet if evacuation didn't fail."); | |
| 3930 HeapWord* addr = (HeapWord*)thisOop; | |
| 3931 if (_g1->is_in_g1_reserved(addr)) | |
| 3932 _cm->grayRoot(oop(addr)); | |
| 3933 } | |
| 3934 } | |
| 3935 | |
| 3936 oop G1ParCopyHelper::copy_to_survivor_space(oop old) { | |
| 3937 size_t word_sz = old->size(); | |
| 3938 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
| 3939 // +1 to make the -1 indexes valid... | |
| 3940 int young_index = from_region->young_index_in_cset()+1; | |
| 3941 assert( (from_region->is_young() && young_index > 0) || | |
| 3942 (!from_region->is_young() && young_index == 0), "invariant" ); | |
| 3943 G1CollectorPolicy* g1p = _g1->g1_policy(); | |
| 3944 markOop m = old->mark(); | |
| 545 | 3945 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
| 3946 : m->age(); | |
| 3947 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
| 342 | 3948 word_sz); |
| 3949 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
| 3950 oop obj = oop(obj_ptr); | |
| 3951 | |
| 3952 if (obj_ptr == NULL) { | |
| 3953 // This will either forward-to-self, or detect that someone else has | |
| 3954 // installed a forwarding pointer. | |
| 3955 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
| 3956 return _g1->handle_evacuation_failure_par(cl, old); | |
| 3957 } | |
| 3958 | |
| 526 | 3959 // We're going to allocate linearly, so might as well prefetch ahead. |
| 3960 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
| 3961 | |
| 342 | 3962 oop forward_ptr = old->forward_to_atomic(obj); |
| 3963 if (forward_ptr == NULL) { | |
| 3964 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
| 526 | 3965 if (g1p->track_object_age(alloc_purpose)) { |
| 3966 // We could simply do obj->incr_age(). However, this causes a | |
| 3967 // performance issue. obj->incr_age() will first check whether | |
| 3968 // the object has a displaced mark by checking its mark word; | |
| 3969 // getting the mark word from the new location of the object | |
| 3970 // stalls. So, given that we already have the mark word and we | |
| 3971 // are about to install it anyway, it's better to increase the | |
| 3972 // age on the mark word, when the object does not have a | |
| 3973 // displaced mark word. We're not expecting many objects to have | |
| 3974 // a displaced marked word, so that case is not optimized | |
| 3975 // further (it could be...) and we simply call obj->incr_age(). | |
| 3976 | |
| 3977 if (m->has_displaced_mark_helper()) { | |
| 3978 // in this case, we have to install the mark word first, | |
| 3979 // otherwise obj looks to be forwarded (the old mark word, | |
| 3980 // which contains the forward pointer, was copied) | |
| 3981 obj->set_mark(m); | |
| 3982 obj->incr_age(); | |
| 3983 } else { | |
| 3984 m = m->incr_age(); | |
| 545 | 3985 obj->set_mark(m); |
| 526 | 3986 } |
| 545 | 3987 _par_scan_state->age_table()->add(obj, word_sz); |
| 3988 } else { | |
| 3989 obj->set_mark(m); | |
| 526 | 3990 } |
| 3991 | |
| 342 | 3992 // preserve "next" mark bit |
| 3993 if (_g1->mark_in_progress() && !_g1->is_obj_ill(old)) { | |
| 3994 if (!use_local_bitmaps || | |
| 3995 !_par_scan_state->alloc_buffer(alloc_purpose)->mark(obj_ptr)) { | |
| 3996 // if we couldn't mark it on the local bitmap (this happens when | |
| 3997 // the object was not allocated in the GCLab), we have to bite | |
| 3998 // the bullet and do the standard parallel mark | |
| 3999 _cm->markAndGrayObjectIfNecessary(obj); | |
| 4000 } | |
| 4001 #if 1 | |
| 4002 if (_g1->isMarkedNext(old)) { | |
| 4003 _cm->nextMarkBitMap()->parClear((HeapWord*)old); | |
| 4004 } | |
| 4005 #endif | |
| 4006 } | |
| 4007 | |
| 4008 size_t* surv_young_words = _par_scan_state->surviving_young_words(); | |
| 4009 surv_young_words[young_index] += word_sz; | |
| 4010 | |
| 4011 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
| 4012 arrayOop(old)->set_length(0); | |
| 526 | 4013 _par_scan_state->push_on_queue(set_partial_array_mask(old)); |
| 342 | 4014 } else { |
| 526 | 4015 // No point in using the slower heap_region_containing() method, |
| 4016 // given that we know obj is in the heap. | |
| 4017 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
| 342 | 4018 obj->oop_iterate_backwards(_scanner); |
| 4019 } | |
| 4020 } else { | |
| 4021 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
| 4022 obj = forward_ptr; | |
| 4023 } | |
| 4024 return obj; | |
| 4025 } | |
| 4026 | |
| 526 | 4027 template<bool do_gen_barrier, G1Barrier barrier, |
| 4028 bool do_mark_forwardee, bool skip_cset_test> | |
| 4029 void G1ParCopyClosure<do_gen_barrier, barrier, | |
| 4030 do_mark_forwardee, skip_cset_test>::do_oop_work(oop* p) { | |
| 342 | 4031 oop obj = *p; |
| 4032 assert(barrier != G1BarrierRS || obj != NULL, | |
| 4033 "Precondition: G1BarrierRS implies obj is nonNull"); | |
| 4034 | |
| 526 | 4035 // The only time we skip the cset test is when we're scanning |
| 4036 // references popped from the queue. And we only push on the queue | |
| 4037 // references that we know point into the cset, so no point in | |
| 4038 // checking again. But we'll leave an assert here for peace of mind. | |
| 4039 assert(!skip_cset_test || _g1->obj_in_cs(obj), "invariant"); | |
| 4040 | |
| 4041 // here the null check is implicit in the cset_fast_test() test | |
| 4042 if (skip_cset_test || _g1->in_cset_fast_test(obj)) { | |
| 342 | 4043 #if G1_REM_SET_LOGGING |
| 526 | 4044 gclog_or_tty->print_cr("Loc "PTR_FORMAT" contains pointer "PTR_FORMAT" " |
| 4045 "into CS.", p, (void*) obj); | |
| 342 | 4046 #endif |
| 526 | 4047 if (obj->is_forwarded()) { |
| 4048 *p = obj->forwardee(); | |
| 4049 } else { | |
| 4050 *p = copy_to_survivor_space(obj); | |
| 342 | 4051 } |
| 526 | 4052 // When scanning the RS, we only care about objs in CS. |
| 4053 if (barrier == G1BarrierRS) { | |
|
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4054 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 342 | 4055 } |
| 526 | 4056 } |
| 4057 | |
| 4058 // When scanning moved objs, must look at all oops. | |
| 4059 if (barrier == G1BarrierEvac && obj != NULL) { | |
|
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4060 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 526 | 4061 } |
| 4062 | |
| 4063 if (do_gen_barrier && obj != NULL) { | |
| 4064 par_do_barrier(p); | |
| 4065 } | |
| 4066 } | |
| 4067 | |
| 4068 template void G1ParCopyClosure<false, G1BarrierEvac, false, true>::do_oop_work(oop* p); | |
| 4069 | |
| 4070 template<class T> void G1ParScanPartialArrayClosure::process_array_chunk( | |
| 342 | 4071 oop obj, int start, int end) { |
| 4072 // process our set of indices (include header in first chunk) | |
| 4073 assert(start < end, "invariant"); | |
| 4074 T* const base = (T*)objArrayOop(obj)->base(); | |
| 526 | 4075 T* const start_addr = (start == 0) ? (T*) obj : base + start; |
| 342 | 4076 T* const end_addr = base + end; |
| 4077 MemRegion mr((HeapWord*)start_addr, (HeapWord*)end_addr); | |
| 4078 _scanner.set_region(_g1->heap_region_containing(obj)); | |
| 4079 obj->oop_iterate(&_scanner, mr); | |
| 4080 } | |
| 4081 | |
| 4082 void G1ParScanPartialArrayClosure::do_oop_nv(oop* p) { | |
| 4083 assert(!UseCompressedOops, "Needs to be fixed to work with compressed oops"); | |
| 526 | 4084 assert(has_partial_array_mask(p), "invariant"); |
| 4085 oop old = clear_partial_array_mask(p); | |
| 342 | 4086 assert(old->is_objArray(), "must be obj array"); |
| 4087 assert(old->is_forwarded(), "must be forwarded"); | |
| 4088 assert(Universe::heap()->is_in_reserved(old), "must be in heap."); | |
| 4089 | |
| 4090 objArrayOop obj = objArrayOop(old->forwardee()); | |
| 4091 assert((void*)old != (void*)old->forwardee(), "self forwarding here?"); | |
| 4092 // Process ParGCArrayScanChunk elements now | |
| 4093 // and push the remainder back onto queue | |
| 4094 int start = arrayOop(old)->length(); | |
| 4095 int end = obj->length(); | |
| 4096 int remainder = end - start; | |
| 4097 assert(start <= end, "just checking"); | |
| 4098 if (remainder > 2 * ParGCArrayScanChunk) { | |
| 4099 // Test above combines last partial chunk with a full chunk | |
| 4100 end = start + ParGCArrayScanChunk; | |
| 4101 arrayOop(old)->set_length(end); | |
| 4102 // Push remainder. | |
| 526 | 4103 _par_scan_state->push_on_queue(set_partial_array_mask(old)); |
| 342 | 4104 } else { |
| 4105 // Restore length so that the heap remains parsable in | |
| 4106 // case of evacuation failure. | |
| 4107 arrayOop(old)->set_length(end); | |
| 4108 } | |
| 4109 | |
| 4110 // process our set of indices (include header in first chunk) | |
| 4111 process_array_chunk<oop>(obj, start, end); | |
| 4112 } | |
| 4113 | |
| 4114 int G1ScanAndBalanceClosure::_nq = 0; | |
| 4115 | |
| 4116 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
| 4117 protected: | |
| 4118 G1CollectedHeap* _g1h; | |
| 4119 G1ParScanThreadState* _par_scan_state; | |
| 4120 RefToScanQueueSet* _queues; | |
| 4121 ParallelTaskTerminator* _terminator; | |
| 4122 | |
| 4123 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
| 4124 RefToScanQueueSet* queues() { return _queues; } | |
| 4125 ParallelTaskTerminator* terminator() { return _terminator; } | |
| 4126 | |
| 4127 public: | |
| 4128 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
| 4129 G1ParScanThreadState* par_scan_state, | |
| 4130 RefToScanQueueSet* queues, | |
| 4131 ParallelTaskTerminator* terminator) | |
| 4132 : _g1h(g1h), _par_scan_state(par_scan_state), | |
| 4133 _queues(queues), _terminator(terminator) {} | |
| 4134 | |
| 4135 void do_void() { | |
| 4136 G1ParScanThreadState* pss = par_scan_state(); | |
| 4137 while (true) { | |
| 4138 oop* ref_to_scan; | |
| 4139 pss->trim_queue(); | |
| 4140 IF_G1_DETAILED_STATS(pss->note_steal_attempt()); | |
| 4141 if (queues()->steal(pss->queue_num(), | |
| 4142 pss->hash_seed(), | |
| 4143 ref_to_scan)) { | |
| 4144 IF_G1_DETAILED_STATS(pss->note_steal()); | |
| 526 | 4145 |
| 4146 // slightly paranoid tests; I'm trying to catch potential | |
| 4147 // problems before we go into push_on_queue to know where the | |
| 4148 // problem is coming from | |
| 4149 assert(ref_to_scan != NULL, "invariant"); | |
| 4150 assert(has_partial_array_mask(ref_to_scan) || | |
| 4151 _g1h->obj_in_cs(*ref_to_scan), "invariant"); | |
| 342 | 4152 pss->push_on_queue(ref_to_scan); |
| 4153 continue; | |
| 4154 } | |
| 4155 pss->start_term_time(); | |
| 4156 if (terminator()->offer_termination()) break; | |
| 4157 pss->end_term_time(); | |
| 4158 } | |
| 4159 pss->end_term_time(); | |
| 4160 pss->retire_alloc_buffers(); | |
| 4161 } | |
| 4162 }; | |
| 4163 | |
| 4164 class G1ParTask : public AbstractGangTask { | |
| 4165 protected: | |
| 4166 G1CollectedHeap* _g1h; | |
| 4167 RefToScanQueueSet *_queues; | |
| 4168 ParallelTaskTerminator _terminator; | |
| 4169 | |
| 4170 Mutex _stats_lock; | |
| 4171 Mutex* stats_lock() { return &_stats_lock; } | |
| 4172 | |
| 4173 size_t getNCards() { | |
| 4174 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
| 4175 / G1BlockOffsetSharedArray::N_bytes; | |
| 4176 } | |
| 4177 | |
| 4178 public: | |
| 4179 G1ParTask(G1CollectedHeap* g1h, int workers, RefToScanQueueSet *task_queues) | |
| 4180 : AbstractGangTask("G1 collection"), | |
| 4181 _g1h(g1h), | |
| 4182 _queues(task_queues), | |
| 4183 _terminator(workers, _queues), | |
| 4184 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true) | |
| 4185 {} | |
| 4186 | |
| 4187 RefToScanQueueSet* queues() { return _queues; } | |
| 4188 | |
| 4189 RefToScanQueue *work_queue(int i) { | |
| 4190 return queues()->queue(i); | |
| 4191 } | |
| 4192 | |
| 4193 void work(int i) { | |
| 4194 ResourceMark rm; | |
| 4195 HandleMark hm; | |
| 4196 | |
| 526 | 4197 G1ParScanThreadState pss(_g1h, i); |
| 4198 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss); | |
| 4199 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss); | |
| 4200 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss); | |
| 342 | 4201 |
| 4202 pss.set_evac_closure(&scan_evac_cl); | |
| 4203 pss.set_evac_failure_closure(&evac_failure_cl); | |
| 4204 pss.set_partial_scan_closure(&partial_scan_cl); | |
| 4205 | |
| 4206 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss); | |
| 4207 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss); | |
| 4208 G1ParScanHeapRSClosure only_scan_heap_rs_cl(_g1h, &pss); | |
|
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|
4209 |
| 342 | 4210 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss); |
| 4211 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss); | |
| 4212 G1ParScanAndMarkHeapRSClosure scan_mark_heap_rs_cl(_g1h, &pss); | |
| 4213 | |
| 4214 OopsInHeapRegionClosure *scan_root_cl; | |
| 4215 OopsInHeapRegionClosure *scan_perm_cl; | |
| 4216 OopsInHeapRegionClosure *scan_so_cl; | |
| 4217 | |
| 4218 if (_g1h->g1_policy()->should_initiate_conc_mark()) { | |
| 4219 scan_root_cl = &scan_mark_root_cl; | |
| 4220 scan_perm_cl = &scan_mark_perm_cl; | |
| 4221 scan_so_cl = &scan_mark_heap_rs_cl; | |
| 4222 } else { | |
| 4223 scan_root_cl = &only_scan_root_cl; | |
| 4224 scan_perm_cl = &only_scan_perm_cl; | |
| 4225 scan_so_cl = &only_scan_heap_rs_cl; | |
| 4226 } | |
| 4227 | |
| 4228 pss.start_strong_roots(); | |
| 4229 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
| 4230 SharedHeap::SO_AllClasses, | |
| 4231 scan_root_cl, | |
| 4232 &only_scan_heap_rs_cl, | |
| 4233 scan_so_cl, | |
| 4234 scan_perm_cl, | |
| 4235 i); | |
| 4236 pss.end_strong_roots(); | |
| 4237 { | |
| 4238 double start = os::elapsedTime(); | |
| 4239 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
| 4240 evac.do_void(); | |
| 4241 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
| 4242 double term_ms = pss.term_time()*1000.0; | |
| 4243 _g1h->g1_policy()->record_obj_copy_time(i, elapsed_ms-term_ms); | |
| 4244 _g1h->g1_policy()->record_termination_time(i, term_ms); | |
| 4245 } | |
| 545 | 4246 if (G1UseSurvivorSpace) { |
| 4247 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); | |
| 4248 } | |
| 342 | 4249 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
| 4250 | |
| 4251 // Clean up any par-expanded rem sets. | |
| 4252 HeapRegionRemSet::par_cleanup(); | |
| 4253 | |
| 4254 MutexLocker x(stats_lock()); | |
| 4255 if (ParallelGCVerbose) { | |
| 4256 gclog_or_tty->print("Thread %d complete:\n", i); | |
| 4257 #if G1_DETAILED_STATS | |
| 4258 gclog_or_tty->print(" Pushes: %7d Pops: %7d Overflows: %7d Steals %7d (in %d attempts)\n", | |
| 4259 pss.pushes(), | |
| 4260 pss.pops(), | |
| 4261 pss.overflow_pushes(), | |
| 4262 pss.steals(), | |
| 4263 pss.steal_attempts()); | |
| 4264 #endif | |
| 4265 double elapsed = pss.elapsed(); | |
| 4266 double strong_roots = pss.strong_roots_time(); | |
| 4267 double term = pss.term_time(); | |
| 4268 gclog_or_tty->print(" Elapsed: %7.2f ms.\n" | |
| 4269 " Strong roots: %7.2f ms (%6.2f%%)\n" | |
| 4270 " Termination: %7.2f ms (%6.2f%%) (in %d entries)\n", | |
| 4271 elapsed * 1000.0, | |
| 4272 strong_roots * 1000.0, (strong_roots*100.0/elapsed), | |
| 4273 term * 1000.0, (term*100.0/elapsed), | |
| 4274 pss.term_attempts()); | |
| 4275 size_t total_waste = pss.alloc_buffer_waste() + pss.undo_waste(); | |
| 4276 gclog_or_tty->print(" Waste: %8dK\n" | |
| 4277 " Alloc Buffer: %8dK\n" | |
| 4278 " Undo: %8dK\n", | |
| 4279 (total_waste * HeapWordSize) / K, | |
| 4280 (pss.alloc_buffer_waste() * HeapWordSize) / K, | |
| 4281 (pss.undo_waste() * HeapWordSize) / K); | |
| 4282 } | |
| 4283 | |
| 4284 assert(pss.refs_to_scan() == 0, "Task queue should be empty"); | |
| 4285 assert(pss.overflowed_refs_to_scan() == 0, "Overflow queue should be empty"); | |
| 4286 } | |
| 4287 }; | |
| 4288 | |
| 4289 // *** Common G1 Evacuation Stuff | |
| 4290 | |
| 4291 class G1CountClosure: public OopsInHeapRegionClosure { | |
| 4292 public: | |
| 4293 int n; | |
| 4294 G1CountClosure() : n(0) {} | |
| 4295 void do_oop(narrowOop* p) { | |
| 4296 guarantee(false, "NYI"); | |
| 4297 } | |
| 4298 void do_oop(oop* p) { | |
| 4299 oop obj = *p; | |
| 4300 assert(obj != NULL && G1CollectedHeap::heap()->obj_in_cs(obj), | |
| 4301 "Rem set closure called on non-rem-set pointer."); | |
| 4302 n++; | |
| 4303 } | |
| 4304 }; | |
| 4305 | |
| 4306 static G1CountClosure count_closure; | |
| 4307 | |
| 4308 void | |
| 4309 G1CollectedHeap:: | |
| 4310 g1_process_strong_roots(bool collecting_perm_gen, | |
| 4311 SharedHeap::ScanningOption so, | |
| 4312 OopClosure* scan_non_heap_roots, | |
| 4313 OopsInHeapRegionClosure* scan_rs, | |
| 4314 OopsInHeapRegionClosure* scan_so, | |
| 4315 OopsInGenClosure* scan_perm, | |
| 4316 int worker_i) { | |
| 4317 // First scan the strong roots, including the perm gen. | |
| 4318 double ext_roots_start = os::elapsedTime(); | |
| 4319 double closure_app_time_sec = 0.0; | |
| 4320 | |
| 4321 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
| 4322 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
| 4323 buf_scan_perm.set_generation(perm_gen()); | |
| 4324 | |
| 4325 process_strong_roots(collecting_perm_gen, so, | |
| 4326 &buf_scan_non_heap_roots, | |
| 4327 &buf_scan_perm); | |
| 4328 // Finish up any enqueued closure apps. | |
| 4329 buf_scan_non_heap_roots.done(); | |
| 4330 buf_scan_perm.done(); | |
| 4331 double ext_roots_end = os::elapsedTime(); | |
| 4332 g1_policy()->reset_obj_copy_time(worker_i); | |
| 4333 double obj_copy_time_sec = | |
| 4334 buf_scan_non_heap_roots.closure_app_seconds() + | |
| 4335 buf_scan_perm.closure_app_seconds(); | |
| 4336 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); | |
| 4337 double ext_root_time_ms = | |
| 4338 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
| 4339 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); | |
| 4340 | |
| 4341 // Scan strong roots in mark stack. | |
| 4342 if (!_process_strong_tasks->is_task_claimed(G1H_PS_mark_stack_oops_do)) { | |
| 4343 concurrent_mark()->oops_do(scan_non_heap_roots); | |
| 4344 } | |
| 4345 double mark_stack_scan_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; | |
| 4346 g1_policy()->record_mark_stack_scan_time(worker_i, mark_stack_scan_ms); | |
| 4347 | |
| 4348 // XXX What should this be doing in the parallel case? | |
| 4349 g1_policy()->record_collection_pause_end_CH_strong_roots(); | |
| 4350 if (G1VerifyRemSet) { | |
| 4351 // :::: FIXME :::: | |
| 4352 // The stupid remembered set doesn't know how to filter out dead | |
| 4353 // objects, which the smart one does, and so when it is created | |
| 4354 // and then compared the number of entries in each differs and | |
| 4355 // the verification code fails. | |
| 4356 guarantee(false, "verification code is broken, see note"); | |
| 4357 | |
| 4358 // Let's make sure that the current rem set agrees with the stupidest | |
| 4359 // one possible! | |
| 4360 bool refs_enabled = ref_processor()->discovery_enabled(); | |
| 4361 if (refs_enabled) ref_processor()->disable_discovery(); | |
| 4362 StupidG1RemSet stupid(this); | |
| 4363 count_closure.n = 0; | |
| 4364 stupid.oops_into_collection_set_do(&count_closure, worker_i); | |
| 4365 int stupid_n = count_closure.n; | |
| 4366 count_closure.n = 0; | |
| 4367 g1_rem_set()->oops_into_collection_set_do(&count_closure, worker_i); | |
| 4368 guarantee(count_closure.n == stupid_n, "Old and new rem sets differ."); | |
| 4369 gclog_or_tty->print_cr("\nFound %d pointers in heap RS.", count_closure.n); | |
| 4370 if (refs_enabled) ref_processor()->enable_discovery(); | |
| 4371 } | |
| 4372 if (scan_so != NULL) { | |
| 4373 scan_scan_only_set(scan_so, worker_i); | |
| 4374 } | |
| 4375 // Now scan the complement of the collection set. | |
| 4376 if (scan_rs != NULL) { | |
| 4377 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
| 4378 } | |
| 4379 // Finish with the ref_processor roots. | |
| 4380 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { | |
| 4381 ref_processor()->oops_do(scan_non_heap_roots); | |
| 4382 } | |
| 4383 g1_policy()->record_collection_pause_end_G1_strong_roots(); | |
| 4384 _process_strong_tasks->all_tasks_completed(); | |
| 4385 } | |
| 4386 | |
| 4387 void | |
| 4388 G1CollectedHeap::scan_scan_only_region(HeapRegion* r, | |
| 4389 OopsInHeapRegionClosure* oc, | |
| 4390 int worker_i) { | |
| 4391 HeapWord* startAddr = r->bottom(); | |
| 4392 HeapWord* endAddr = r->used_region().end(); | |
| 4393 | |
| 4394 oc->set_region(r); | |
| 4395 | |
| 4396 HeapWord* p = r->bottom(); | |
| 4397 HeapWord* t = r->top(); | |
| 4398 guarantee( p == r->next_top_at_mark_start(), "invariant" ); | |
| 4399 while (p < t) { | |
| 4400 oop obj = oop(p); | |
| 4401 p += obj->oop_iterate(oc); | |
| 4402 } | |
| 4403 } | |
| 4404 | |
| 4405 void | |
| 4406 G1CollectedHeap::scan_scan_only_set(OopsInHeapRegionClosure* oc, | |
| 4407 int worker_i) { | |
| 4408 double start = os::elapsedTime(); | |
| 4409 | |
| 4410 BufferingOopsInHeapRegionClosure boc(oc); | |
| 4411 | |
| 4412 FilterInHeapRegionAndIntoCSClosure scan_only(this, &boc); | |
| 4413 FilterAndMarkInHeapRegionAndIntoCSClosure scan_and_mark(this, &boc, concurrent_mark()); | |
| 4414 | |
| 4415 OopsInHeapRegionClosure *foc; | |
| 4416 if (g1_policy()->should_initiate_conc_mark()) | |
| 4417 foc = &scan_and_mark; | |
| 4418 else | |
| 4419 foc = &scan_only; | |
| 4420 | |
| 4421 HeapRegion* hr; | |
| 4422 int n = 0; | |
| 4423 while ((hr = _young_list->par_get_next_scan_only_region()) != NULL) { | |
| 4424 scan_scan_only_region(hr, foc, worker_i); | |
| 4425 ++n; | |
| 4426 } | |
| 4427 boc.done(); | |
| 4428 | |
| 4429 double closure_app_s = boc.closure_app_seconds(); | |
| 4430 g1_policy()->record_obj_copy_time(worker_i, closure_app_s * 1000.0); | |
| 4431 double ms = (os::elapsedTime() - start - closure_app_s)*1000.0; | |
| 4432 g1_policy()->record_scan_only_time(worker_i, ms, n); | |
| 4433 } | |
| 4434 | |
| 4435 void | |
| 4436 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
| 4437 OopClosure* non_root_closure) { | |
| 4438 SharedHeap::process_weak_roots(root_closure, non_root_closure); | |
| 4439 } | |
| 4440 | |
| 4441 | |
| 4442 class SaveMarksClosure: public HeapRegionClosure { | |
| 4443 public: | |
| 4444 bool doHeapRegion(HeapRegion* r) { | |
| 4445 r->save_marks(); | |
| 4446 return false; | |
| 4447 } | |
| 4448 }; | |
| 4449 | |
| 4450 void G1CollectedHeap::save_marks() { | |
| 4451 if (ParallelGCThreads == 0) { | |
| 4452 SaveMarksClosure sm; | |
| 4453 heap_region_iterate(&sm); | |
| 4454 } | |
| 4455 // We do this even in the parallel case | |
| 4456 perm_gen()->save_marks(); | |
| 4457 } | |
| 4458 | |
| 4459 void G1CollectedHeap::evacuate_collection_set() { | |
| 4460 set_evacuation_failed(false); | |
| 4461 | |
| 4462 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
| 4463 concurrent_g1_refine()->set_use_cache(false); | |
| 4464 int n_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); | |
| 4465 set_par_threads(n_workers); | |
| 4466 G1ParTask g1_par_task(this, n_workers, _task_queues); | |
| 4467 | |
| 4468 init_for_evac_failure(NULL); | |
| 4469 | |
| 4470 change_strong_roots_parity(); // In preparation for parallel strong roots. | |
| 4471 rem_set()->prepare_for_younger_refs_iterate(true); | |
|
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4472 |
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4473 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
| 342 | 4474 double start_par = os::elapsedTime(); |
| 4475 if (ParallelGCThreads > 0) { | |
| 4476 // The individual threads will set their evac-failure closures. | |
| 4477 workers()->run_task(&g1_par_task); | |
| 4478 } else { | |
| 4479 g1_par_task.work(0); | |
| 4480 } | |
| 4481 | |
| 4482 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
| 4483 g1_policy()->record_par_time(par_time); | |
| 4484 set_par_threads(0); | |
| 4485 // Is this the right thing to do here? We don't save marks | |
| 4486 // on individual heap regions when we allocate from | |
| 4487 // them in parallel, so this seems like the correct place for this. | |
| 545 | 4488 retire_all_alloc_regions(); |
| 342 | 4489 { |
| 4490 G1IsAliveClosure is_alive(this); | |
| 4491 G1KeepAliveClosure keep_alive(this); | |
| 4492 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
| 4493 } | |
| 4494 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); | |
|
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4495 |
| 342 | 4496 concurrent_g1_refine()->set_use_cache(true); |
| 4497 | |
| 4498 finalize_for_evac_failure(); | |
| 4499 | |
| 4500 // Must do this before removing self-forwarding pointers, which clears | |
| 4501 // the per-region evac-failure flags. | |
| 4502 concurrent_mark()->complete_marking_in_collection_set(); | |
| 4503 | |
| 4504 if (evacuation_failed()) { | |
| 4505 remove_self_forwarding_pointers(); | |
| 4506 if (PrintGCDetails) { | |
| 4507 gclog_or_tty->print(" (evacuation failed)"); | |
| 4508 } else if (PrintGC) { | |
| 4509 gclog_or_tty->print("--"); | |
| 4510 } | |
| 4511 } | |
| 4512 | |
|
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4513 if (G1DeferredRSUpdate) { |
|
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4514 RedirtyLoggedCardTableEntryFastClosure redirty; |
|
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|
4515 dirty_card_queue_set().set_closure(&redirty); |
|
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4516 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
|
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4517 JavaThread::dirty_card_queue_set().merge_bufferlists(&dirty_card_queue_set()); |
|
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4518 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
|
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4519 } |
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|
4520 |
| 342 | 4521 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
| 4522 } | |
| 4523 | |
| 4524 void G1CollectedHeap::free_region(HeapRegion* hr) { | |
| 4525 size_t pre_used = 0; | |
| 4526 size_t cleared_h_regions = 0; | |
| 4527 size_t freed_regions = 0; | |
| 4528 UncleanRegionList local_list; | |
| 4529 | |
| 4530 HeapWord* start = hr->bottom(); | |
| 4531 HeapWord* end = hr->prev_top_at_mark_start(); | |
| 4532 size_t used_bytes = hr->used(); | |
| 4533 size_t live_bytes = hr->max_live_bytes(); | |
| 4534 if (used_bytes > 0) { | |
| 4535 guarantee( live_bytes <= used_bytes, "invariant" ); | |
| 4536 } else { | |
| 4537 guarantee( live_bytes == 0, "invariant" ); | |
| 4538 } | |
| 4539 | |
| 4540 size_t garbage_bytes = used_bytes - live_bytes; | |
| 4541 if (garbage_bytes > 0) | |
| 4542 g1_policy()->decrease_known_garbage_bytes(garbage_bytes); | |
| 4543 | |
| 4544 free_region_work(hr, pre_used, cleared_h_regions, freed_regions, | |
| 4545 &local_list); | |
| 4546 finish_free_region_work(pre_used, cleared_h_regions, freed_regions, | |
| 4547 &local_list); | |
| 4548 } | |
| 4549 | |
| 4550 void | |
| 4551 G1CollectedHeap::free_region_work(HeapRegion* hr, | |
| 4552 size_t& pre_used, | |
| 4553 size_t& cleared_h_regions, | |
| 4554 size_t& freed_regions, | |
| 4555 UncleanRegionList* list, | |
| 4556 bool par) { | |
| 4557 assert(!hr->popular(), "should not free popular regions"); | |
| 4558 pre_used += hr->used(); | |
| 4559 if (hr->isHumongous()) { | |
| 4560 assert(hr->startsHumongous(), | |
| 4561 "Only the start of a humongous region should be freed."); | |
| 4562 int ind = _hrs->find(hr); | |
| 4563 assert(ind != -1, "Should have an index."); | |
| 4564 // Clear the start region. | |
| 4565 hr->hr_clear(par, true /*clear_space*/); | |
| 4566 list->insert_before_head(hr); | |
| 4567 cleared_h_regions++; | |
| 4568 freed_regions++; | |
| 4569 // Clear any continued regions. | |
| 4570 ind++; | |
| 4571 while ((size_t)ind < n_regions()) { | |
| 4572 HeapRegion* hrc = _hrs->at(ind); | |
| 4573 if (!hrc->continuesHumongous()) break; | |
| 4574 // Otherwise, does continue the H region. | |
| 4575 assert(hrc->humongous_start_region() == hr, "Huh?"); | |
| 4576 hrc->hr_clear(par, true /*clear_space*/); | |
| 4577 cleared_h_regions++; | |
| 4578 freed_regions++; | |
| 4579 list->insert_before_head(hrc); | |
| 4580 ind++; | |
| 4581 } | |
| 4582 } else { | |
| 4583 hr->hr_clear(par, true /*clear_space*/); | |
| 4584 list->insert_before_head(hr); | |
| 4585 freed_regions++; | |
| 4586 // If we're using clear2, this should not be enabled. | |
| 4587 // assert(!hr->in_cohort(), "Can't be both free and in a cohort."); | |
| 4588 } | |
| 4589 } | |
| 4590 | |
| 4591 void G1CollectedHeap::finish_free_region_work(size_t pre_used, | |
| 4592 size_t cleared_h_regions, | |
| 4593 size_t freed_regions, | |
| 4594 UncleanRegionList* list) { | |
| 4595 if (list != NULL && list->sz() > 0) { | |
| 4596 prepend_region_list_on_unclean_list(list); | |
| 4597 } | |
| 4598 // Acquire a lock, if we're parallel, to update possibly-shared | |
| 4599 // variables. | |
| 4600 Mutex* lock = (n_par_threads() > 0) ? ParGCRareEvent_lock : NULL; | |
| 4601 { | |
| 4602 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); | |
| 4603 _summary_bytes_used -= pre_used; | |
| 4604 _num_humongous_regions -= (int) cleared_h_regions; | |
| 4605 _free_regions += freed_regions; | |
| 4606 } | |
| 4607 } | |
| 4608 | |
| 4609 | |
| 4610 void G1CollectedHeap::dirtyCardsForYoungRegions(CardTableModRefBS* ct_bs, HeapRegion* list) { | |
| 4611 while (list != NULL) { | |
| 4612 guarantee( list->is_young(), "invariant" ); | |
| 4613 | |
| 4614 HeapWord* bottom = list->bottom(); | |
| 4615 HeapWord* end = list->end(); | |
| 4616 MemRegion mr(bottom, end); | |
| 4617 ct_bs->dirty(mr); | |
| 4618 | |
| 4619 list = list->get_next_young_region(); | |
| 4620 } | |
| 4621 } | |
| 4622 | |
| 4623 void G1CollectedHeap::cleanUpCardTable() { | |
| 4624 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
| 4625 double start = os::elapsedTime(); | |
| 4626 | |
| 4627 ct_bs->clear(_g1_committed); | |
| 4628 | |
| 4629 // now, redirty the cards of the scan-only and survivor regions | |
| 4630 // (it seemed faster to do it this way, instead of iterating over | |
| 4631 // all regions and then clearing / dirtying as approprite) | |
| 4632 dirtyCardsForYoungRegions(ct_bs, _young_list->first_scan_only_region()); | |
| 4633 dirtyCardsForYoungRegions(ct_bs, _young_list->first_survivor_region()); | |
| 4634 | |
| 4635 double elapsed = os::elapsedTime() - start; | |
| 4636 g1_policy()->record_clear_ct_time( elapsed * 1000.0); | |
| 4637 } | |
| 4638 | |
| 4639 | |
| 4640 void G1CollectedHeap::do_collection_pause_if_appropriate(size_t word_size) { | |
| 4641 // First do any popular regions. | |
| 4642 HeapRegion* hr; | |
| 4643 while ((hr = popular_region_to_evac()) != NULL) { | |
| 4644 evac_popular_region(hr); | |
| 4645 } | |
| 4646 // Now do heuristic pauses. | |
| 4647 if (g1_policy()->should_do_collection_pause(word_size)) { | |
| 4648 do_collection_pause(); | |
| 4649 } | |
| 4650 } | |
| 4651 | |
| 4652 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
| 4653 double young_time_ms = 0.0; | |
| 4654 double non_young_time_ms = 0.0; | |
| 4655 | |
| 4656 G1CollectorPolicy* policy = g1_policy(); | |
| 4657 | |
| 4658 double start_sec = os::elapsedTime(); | |
| 4659 bool non_young = true; | |
| 4660 | |
| 4661 HeapRegion* cur = cs_head; | |
| 4662 int age_bound = -1; | |
| 4663 size_t rs_lengths = 0; | |
| 4664 | |
| 4665 while (cur != NULL) { | |
| 4666 if (non_young) { | |
| 4667 if (cur->is_young()) { | |
| 4668 double end_sec = os::elapsedTime(); | |
| 4669 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 4670 non_young_time_ms += elapsed_ms; | |
| 4671 | |
| 4672 start_sec = os::elapsedTime(); | |
| 4673 non_young = false; | |
| 4674 } | |
| 4675 } else { | |
| 4676 if (!cur->is_on_free_list()) { | |
| 4677 double end_sec = os::elapsedTime(); | |
| 4678 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 4679 young_time_ms += elapsed_ms; | |
| 4680 | |
| 4681 start_sec = os::elapsedTime(); | |
| 4682 non_young = true; | |
| 4683 } | |
| 4684 } | |
| 4685 | |
| 4686 rs_lengths += cur->rem_set()->occupied(); | |
| 4687 | |
| 4688 HeapRegion* next = cur->next_in_collection_set(); | |
| 4689 assert(cur->in_collection_set(), "bad CS"); | |
| 4690 cur->set_next_in_collection_set(NULL); | |
| 4691 cur->set_in_collection_set(false); | |
| 4692 | |
| 4693 if (cur->is_young()) { | |
| 4694 int index = cur->young_index_in_cset(); | |
| 4695 guarantee( index != -1, "invariant" ); | |
| 4696 guarantee( (size_t)index < policy->young_cset_length(), "invariant" ); | |
| 4697 size_t words_survived = _surviving_young_words[index]; | |
| 4698 cur->record_surv_words_in_group(words_survived); | |
| 4699 } else { | |
| 4700 int index = cur->young_index_in_cset(); | |
| 4701 guarantee( index == -1, "invariant" ); | |
| 4702 } | |
| 4703 | |
| 4704 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
| 4705 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
| 4706 "invariant" ); | |
| 4707 | |
| 4708 if (!cur->evacuation_failed()) { | |
| 4709 // And the region is empty. | |
| 4710 assert(!cur->is_empty(), | |
| 4711 "Should not have empty regions in a CS."); | |
| 4712 free_region(cur); | |
| 4713 } else { | |
| 4714 guarantee( !cur->is_scan_only(), "should not be scan only" ); | |
| 4715 cur->uninstall_surv_rate_group(); | |
| 4716 if (cur->is_young()) | |
| 4717 cur->set_young_index_in_cset(-1); | |
| 4718 cur->set_not_young(); | |
| 4719 cur->set_evacuation_failed(false); | |
| 4720 } | |
| 4721 cur = next; | |
| 4722 } | |
| 4723 | |
| 4724 policy->record_max_rs_lengths(rs_lengths); | |
| 4725 policy->cset_regions_freed(); | |
| 4726 | |
| 4727 double end_sec = os::elapsedTime(); | |
| 4728 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 4729 if (non_young) | |
| 4730 non_young_time_ms += elapsed_ms; | |
| 4731 else | |
| 4732 young_time_ms += elapsed_ms; | |
| 4733 | |
| 4734 policy->record_young_free_cset_time_ms(young_time_ms); | |
| 4735 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
| 4736 } | |
| 4737 | |
| 4738 HeapRegion* | |
| 4739 G1CollectedHeap::alloc_region_from_unclean_list_locked(bool zero_filled) { | |
| 4740 assert(ZF_mon->owned_by_self(), "Precondition"); | |
| 4741 HeapRegion* res = pop_unclean_region_list_locked(); | |
| 4742 if (res != NULL) { | |
| 4743 assert(!res->continuesHumongous() && | |
| 4744 res->zero_fill_state() != HeapRegion::Allocated, | |
| 4745 "Only free regions on unclean list."); | |
| 4746 if (zero_filled) { | |
| 4747 res->ensure_zero_filled_locked(); | |
| 4748 res->set_zero_fill_allocated(); | |
| 4749 } | |
| 4750 } | |
| 4751 return res; | |
| 4752 } | |
| 4753 | |
| 4754 HeapRegion* G1CollectedHeap::alloc_region_from_unclean_list(bool zero_filled) { | |
| 4755 MutexLockerEx zx(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4756 return alloc_region_from_unclean_list_locked(zero_filled); | |
| 4757 } | |
| 4758 | |
| 4759 void G1CollectedHeap::put_region_on_unclean_list(HeapRegion* r) { | |
| 4760 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4761 put_region_on_unclean_list_locked(r); | |
| 4762 if (should_zf()) ZF_mon->notify_all(); // Wake up ZF thread. | |
| 4763 } | |
| 4764 | |
| 4765 void G1CollectedHeap::set_unclean_regions_coming(bool b) { | |
| 4766 MutexLockerEx x(Cleanup_mon); | |
| 4767 set_unclean_regions_coming_locked(b); | |
| 4768 } | |
| 4769 | |
| 4770 void G1CollectedHeap::set_unclean_regions_coming_locked(bool b) { | |
| 4771 assert(Cleanup_mon->owned_by_self(), "Precondition"); | |
| 4772 _unclean_regions_coming = b; | |
| 4773 // Wake up mutator threads that might be waiting for completeCleanup to | |
| 4774 // finish. | |
| 4775 if (!b) Cleanup_mon->notify_all(); | |
| 4776 } | |
| 4777 | |
| 4778 void G1CollectedHeap::wait_for_cleanup_complete() { | |
| 4779 MutexLockerEx x(Cleanup_mon); | |
| 4780 wait_for_cleanup_complete_locked(); | |
| 4781 } | |
| 4782 | |
| 4783 void G1CollectedHeap::wait_for_cleanup_complete_locked() { | |
| 4784 assert(Cleanup_mon->owned_by_self(), "precondition"); | |
| 4785 while (_unclean_regions_coming) { | |
| 4786 Cleanup_mon->wait(); | |
| 4787 } | |
| 4788 } | |
| 4789 | |
| 4790 void | |
| 4791 G1CollectedHeap::put_region_on_unclean_list_locked(HeapRegion* r) { | |
| 4792 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4793 _unclean_region_list.insert_before_head(r); | |
| 4794 } | |
| 4795 | |
| 4796 void | |
| 4797 G1CollectedHeap::prepend_region_list_on_unclean_list(UncleanRegionList* list) { | |
| 4798 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4799 prepend_region_list_on_unclean_list_locked(list); | |
| 4800 if (should_zf()) ZF_mon->notify_all(); // Wake up ZF thread. | |
| 4801 } | |
| 4802 | |
| 4803 void | |
| 4804 G1CollectedHeap:: | |
| 4805 prepend_region_list_on_unclean_list_locked(UncleanRegionList* list) { | |
| 4806 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4807 _unclean_region_list.prepend_list(list); | |
| 4808 } | |
| 4809 | |
| 4810 HeapRegion* G1CollectedHeap::pop_unclean_region_list_locked() { | |
| 4811 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4812 HeapRegion* res = _unclean_region_list.pop(); | |
| 4813 if (res != NULL) { | |
| 4814 // Inform ZF thread that there's a new unclean head. | |
| 4815 if (_unclean_region_list.hd() != NULL && should_zf()) | |
| 4816 ZF_mon->notify_all(); | |
| 4817 } | |
| 4818 return res; | |
| 4819 } | |
| 4820 | |
| 4821 HeapRegion* G1CollectedHeap::peek_unclean_region_list_locked() { | |
| 4822 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4823 return _unclean_region_list.hd(); | |
| 4824 } | |
| 4825 | |
| 4826 | |
| 4827 bool G1CollectedHeap::move_cleaned_region_to_free_list_locked() { | |
| 4828 assert(ZF_mon->owned_by_self(), "Precondition"); | |
| 4829 HeapRegion* r = peek_unclean_region_list_locked(); | |
| 4830 if (r != NULL && r->zero_fill_state() == HeapRegion::ZeroFilled) { | |
| 4831 // Result of below must be equal to "r", since we hold the lock. | |
| 4832 (void)pop_unclean_region_list_locked(); | |
| 4833 put_free_region_on_list_locked(r); | |
| 4834 return true; | |
| 4835 } else { | |
| 4836 return false; | |
| 4837 } | |
| 4838 } | |
| 4839 | |
| 4840 bool G1CollectedHeap::move_cleaned_region_to_free_list() { | |
| 4841 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4842 return move_cleaned_region_to_free_list_locked(); | |
| 4843 } | |
| 4844 | |
| 4845 | |
| 4846 void G1CollectedHeap::put_free_region_on_list_locked(HeapRegion* r) { | |
| 4847 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4848 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4849 assert(r->zero_fill_state() == HeapRegion::ZeroFilled, | |
| 4850 "Regions on free list must be zero filled"); | |
| 4851 assert(!r->isHumongous(), "Must not be humongous."); | |
| 4852 assert(r->is_empty(), "Better be empty"); | |
| 4853 assert(!r->is_on_free_list(), | |
| 4854 "Better not already be on free list"); | |
| 4855 assert(!r->is_on_unclean_list(), | |
| 4856 "Better not already be on unclean list"); | |
| 4857 r->set_on_free_list(true); | |
| 4858 r->set_next_on_free_list(_free_region_list); | |
| 4859 _free_region_list = r; | |
| 4860 _free_region_list_size++; | |
| 4861 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4862 } | |
| 4863 | |
| 4864 void G1CollectedHeap::put_free_region_on_list(HeapRegion* r) { | |
| 4865 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4866 put_free_region_on_list_locked(r); | |
| 4867 } | |
| 4868 | |
| 4869 HeapRegion* G1CollectedHeap::pop_free_region_list_locked() { | |
| 4870 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4871 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4872 HeapRegion* res = _free_region_list; | |
| 4873 if (res != NULL) { | |
| 4874 _free_region_list = res->next_from_free_list(); | |
| 4875 _free_region_list_size--; | |
| 4876 res->set_on_free_list(false); | |
| 4877 res->set_next_on_free_list(NULL); | |
| 4878 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4879 } | |
| 4880 return res; | |
| 4881 } | |
| 4882 | |
| 4883 | |
| 4884 HeapRegion* G1CollectedHeap::alloc_free_region_from_lists(bool zero_filled) { | |
| 4885 // By self, or on behalf of self. | |
| 4886 assert(Heap_lock->is_locked(), "Precondition"); | |
| 4887 HeapRegion* res = NULL; | |
| 4888 bool first = true; | |
| 4889 while (res == NULL) { | |
| 4890 if (zero_filled || !first) { | |
| 4891 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4892 res = pop_free_region_list_locked(); | |
| 4893 if (res != NULL) { | |
| 4894 assert(!res->zero_fill_is_allocated(), | |
| 4895 "No allocated regions on free list."); | |
| 4896 res->set_zero_fill_allocated(); | |
| 4897 } else if (!first) { | |
| 4898 break; // We tried both, time to return NULL. | |
| 4899 } | |
| 4900 } | |
| 4901 | |
| 4902 if (res == NULL) { | |
| 4903 res = alloc_region_from_unclean_list(zero_filled); | |
| 4904 } | |
| 4905 assert(res == NULL || | |
| 4906 !zero_filled || | |
| 4907 res->zero_fill_is_allocated(), | |
| 4908 "We must have allocated the region we're returning"); | |
| 4909 first = false; | |
| 4910 } | |
| 4911 return res; | |
| 4912 } | |
| 4913 | |
| 4914 void G1CollectedHeap::remove_allocated_regions_from_lists() { | |
| 4915 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4916 { | |
| 4917 HeapRegion* prev = NULL; | |
| 4918 HeapRegion* cur = _unclean_region_list.hd(); | |
| 4919 while (cur != NULL) { | |
| 4920 HeapRegion* next = cur->next_from_unclean_list(); | |
| 4921 if (cur->zero_fill_is_allocated()) { | |
| 4922 // Remove from the list. | |
| 4923 if (prev == NULL) { | |
| 4924 (void)_unclean_region_list.pop(); | |
| 4925 } else { | |
| 4926 _unclean_region_list.delete_after(prev); | |
| 4927 } | |
| 4928 cur->set_on_unclean_list(false); | |
| 4929 cur->set_next_on_unclean_list(NULL); | |
| 4930 } else { | |
| 4931 prev = cur; | |
| 4932 } | |
| 4933 cur = next; | |
| 4934 } | |
| 4935 assert(_unclean_region_list.sz() == unclean_region_list_length(), | |
| 4936 "Inv"); | |
| 4937 } | |
| 4938 | |
| 4939 { | |
| 4940 HeapRegion* prev = NULL; | |
| 4941 HeapRegion* cur = _free_region_list; | |
| 4942 while (cur != NULL) { | |
| 4943 HeapRegion* next = cur->next_from_free_list(); | |
| 4944 if (cur->zero_fill_is_allocated()) { | |
| 4945 // Remove from the list. | |
| 4946 if (prev == NULL) { | |
| 4947 _free_region_list = cur->next_from_free_list(); | |
| 4948 } else { | |
| 4949 prev->set_next_on_free_list(cur->next_from_free_list()); | |
| 4950 } | |
| 4951 cur->set_on_free_list(false); | |
| 4952 cur->set_next_on_free_list(NULL); | |
| 4953 _free_region_list_size--; | |
| 4954 } else { | |
| 4955 prev = cur; | |
| 4956 } | |
| 4957 cur = next; | |
| 4958 } | |
| 4959 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4960 } | |
| 4961 } | |
| 4962 | |
| 4963 bool G1CollectedHeap::verify_region_lists() { | |
| 4964 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4965 return verify_region_lists_locked(); | |
| 4966 } | |
| 4967 | |
| 4968 bool G1CollectedHeap::verify_region_lists_locked() { | |
| 4969 HeapRegion* unclean = _unclean_region_list.hd(); | |
| 4970 while (unclean != NULL) { | |
| 4971 guarantee(unclean->is_on_unclean_list(), "Well, it is!"); | |
| 4972 guarantee(!unclean->is_on_free_list(), "Well, it shouldn't be!"); | |
| 4973 guarantee(unclean->zero_fill_state() != HeapRegion::Allocated, | |
| 4974 "Everything else is possible."); | |
| 4975 unclean = unclean->next_from_unclean_list(); | |
| 4976 } | |
| 4977 guarantee(_unclean_region_list.sz() == unclean_region_list_length(), "Inv"); | |
| 4978 | |
| 4979 HeapRegion* free_r = _free_region_list; | |
| 4980 while (free_r != NULL) { | |
| 4981 assert(free_r->is_on_free_list(), "Well, it is!"); | |
| 4982 assert(!free_r->is_on_unclean_list(), "Well, it shouldn't be!"); | |
| 4983 switch (free_r->zero_fill_state()) { | |
| 4984 case HeapRegion::NotZeroFilled: | |
| 4985 case HeapRegion::ZeroFilling: | |
| 4986 guarantee(false, "Should not be on free list."); | |
| 4987 break; | |
| 4988 default: | |
| 4989 // Everything else is possible. | |
| 4990 break; | |
| 4991 } | |
| 4992 free_r = free_r->next_from_free_list(); | |
| 4993 } | |
| 4994 guarantee(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4995 // If we didn't do an assertion... | |
| 4996 return true; | |
| 4997 } | |
| 4998 | |
| 4999 size_t G1CollectedHeap::free_region_list_length() { | |
| 5000 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 5001 size_t len = 0; | |
| 5002 HeapRegion* cur = _free_region_list; | |
| 5003 while (cur != NULL) { | |
| 5004 len++; | |
| 5005 cur = cur->next_from_free_list(); | |
| 5006 } | |
| 5007 return len; | |
| 5008 } | |
| 5009 | |
| 5010 size_t G1CollectedHeap::unclean_region_list_length() { | |
| 5011 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 5012 return _unclean_region_list.length(); | |
| 5013 } | |
| 5014 | |
| 5015 size_t G1CollectedHeap::n_regions() { | |
| 5016 return _hrs->length(); | |
| 5017 } | |
| 5018 | |
| 5019 size_t G1CollectedHeap::max_regions() { | |
| 5020 return | |
| 5021 (size_t)align_size_up(g1_reserved_obj_bytes(), HeapRegion::GrainBytes) / | |
| 5022 HeapRegion::GrainBytes; | |
| 5023 } | |
| 5024 | |
| 5025 size_t G1CollectedHeap::free_regions() { | |
| 5026 /* Possibly-expensive assert. | |
| 5027 assert(_free_regions == count_free_regions(), | |
| 5028 "_free_regions is off."); | |
| 5029 */ | |
| 5030 return _free_regions; | |
| 5031 } | |
| 5032 | |
| 5033 bool G1CollectedHeap::should_zf() { | |
| 5034 return _free_region_list_size < (size_t) G1ConcZFMaxRegions; | |
| 5035 } | |
| 5036 | |
| 5037 class RegionCounter: public HeapRegionClosure { | |
| 5038 size_t _n; | |
| 5039 public: | |
| 5040 RegionCounter() : _n(0) {} | |
| 5041 bool doHeapRegion(HeapRegion* r) { | |
| 5042 if (r->is_empty() && !r->popular()) { | |
| 5043 assert(!r->isHumongous(), "H regions should not be empty."); | |
| 5044 _n++; | |
| 5045 } | |
| 5046 return false; | |
| 5047 } | |
| 5048 int res() { return (int) _n; } | |
| 5049 }; | |
| 5050 | |
| 5051 size_t G1CollectedHeap::count_free_regions() { | |
| 5052 RegionCounter rc; | |
| 5053 heap_region_iterate(&rc); | |
| 5054 size_t n = rc.res(); | |
| 5055 if (_cur_alloc_region != NULL && _cur_alloc_region->is_empty()) | |
| 5056 n--; | |
| 5057 return n; | |
| 5058 } | |
| 5059 | |
| 5060 size_t G1CollectedHeap::count_free_regions_list() { | |
| 5061 size_t n = 0; | |
| 5062 size_t o = 0; | |
| 5063 ZF_mon->lock_without_safepoint_check(); | |
| 5064 HeapRegion* cur = _free_region_list; | |
| 5065 while (cur != NULL) { | |
| 5066 cur = cur->next_from_free_list(); | |
| 5067 n++; | |
| 5068 } | |
| 5069 size_t m = unclean_region_list_length(); | |
| 5070 ZF_mon->unlock(); | |
| 5071 return n + m; | |
| 5072 } | |
| 5073 | |
| 5074 bool G1CollectedHeap::should_set_young_locked() { | |
| 5075 assert(heap_lock_held_for_gc(), | |
| 5076 "the heap lock should already be held by or for this thread"); | |
| 5077 return (g1_policy()->in_young_gc_mode() && | |
| 5078 g1_policy()->should_add_next_region_to_young_list()); | |
| 5079 } | |
| 5080 | |
| 5081 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
| 5082 assert(heap_lock_held_for_gc(), | |
| 5083 "the heap lock should already be held by or for this thread"); | |
| 5084 _young_list->push_region(hr); | |
| 5085 g1_policy()->set_region_short_lived(hr); | |
| 5086 } | |
| 5087 | |
| 5088 class NoYoungRegionsClosure: public HeapRegionClosure { | |
| 5089 private: | |
| 5090 bool _success; | |
| 5091 public: | |
| 5092 NoYoungRegionsClosure() : _success(true) { } | |
| 5093 bool doHeapRegion(HeapRegion* r) { | |
| 5094 if (r->is_young()) { | |
| 5095 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
| 5096 r->bottom(), r->end()); | |
| 5097 _success = false; | |
| 5098 } | |
| 5099 return false; | |
| 5100 } | |
| 5101 bool success() { return _success; } | |
| 5102 }; | |
| 5103 | |
| 5104 bool G1CollectedHeap::check_young_list_empty(bool ignore_scan_only_list, | |
| 5105 bool check_sample) { | |
| 5106 bool ret = true; | |
| 5107 | |
| 5108 ret = _young_list->check_list_empty(ignore_scan_only_list, check_sample); | |
| 5109 if (!ignore_scan_only_list) { | |
| 5110 NoYoungRegionsClosure closure; | |
| 5111 heap_region_iterate(&closure); | |
| 5112 ret = ret && closure.success(); | |
| 5113 } | |
| 5114 | |
| 5115 return ret; | |
| 5116 } | |
| 5117 | |
| 5118 void G1CollectedHeap::empty_young_list() { | |
| 5119 assert(heap_lock_held_for_gc(), | |
| 5120 "the heap lock should already be held by or for this thread"); | |
| 5121 assert(g1_policy()->in_young_gc_mode(), "should be in young GC mode"); | |
| 5122 | |
| 5123 _young_list->empty_list(); | |
| 5124 } | |
| 5125 | |
| 5126 bool G1CollectedHeap::all_alloc_regions_no_allocs_since_save_marks() { | |
| 5127 bool no_allocs = true; | |
| 5128 for (int ap = 0; ap < GCAllocPurposeCount && no_allocs; ++ap) { | |
| 5129 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 5130 no_allocs = r == NULL || r->saved_mark_at_top(); | |
| 5131 } | |
| 5132 return no_allocs; | |
| 5133 } | |
| 5134 | |
| 545 | 5135 void G1CollectedHeap::retire_all_alloc_regions() { |
| 342 | 5136 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
| 5137 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 5138 if (r != NULL) { | |
| 5139 // Check for aliases. | |
| 5140 bool has_processed_alias = false; | |
| 5141 for (int i = 0; i < ap; ++i) { | |
| 5142 if (_gc_alloc_regions[i] == r) { | |
| 5143 has_processed_alias = true; | |
| 5144 break; | |
| 5145 } | |
| 5146 } | |
| 5147 if (!has_processed_alias) { | |
| 545 | 5148 retire_alloc_region(r, false /* par */); |
| 342 | 5149 } |
| 5150 } | |
| 5151 } | |
| 5152 } | |
| 5153 | |
| 5154 | |
| 5155 // Done at the start of full GC. | |
| 5156 void G1CollectedHeap::tear_down_region_lists() { | |
| 5157 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5158 while (pop_unclean_region_list_locked() != NULL) ; | |
| 5159 assert(_unclean_region_list.hd() == NULL && _unclean_region_list.sz() == 0, | |
| 5160 "Postconditions of loop.") | |
| 5161 while (pop_free_region_list_locked() != NULL) ; | |
| 5162 assert(_free_region_list == NULL, "Postcondition of loop."); | |
| 5163 if (_free_region_list_size != 0) { | |
| 5164 gclog_or_tty->print_cr("Size is %d.", _free_region_list_size); | |
| 5165 print(); | |
| 5166 } | |
| 5167 assert(_free_region_list_size == 0, "Postconditions of loop."); | |
| 5168 } | |
| 5169 | |
| 5170 | |
| 5171 class RegionResetter: public HeapRegionClosure { | |
| 5172 G1CollectedHeap* _g1; | |
| 5173 int _n; | |
| 5174 public: | |
| 5175 RegionResetter() : _g1(G1CollectedHeap::heap()), _n(0) {} | |
| 5176 bool doHeapRegion(HeapRegion* r) { | |
| 5177 if (r->continuesHumongous()) return false; | |
| 5178 if (r->top() > r->bottom()) { | |
| 5179 if (r->top() < r->end()) { | |
| 5180 Copy::fill_to_words(r->top(), | |
| 5181 pointer_delta(r->end(), r->top())); | |
| 5182 } | |
| 5183 r->set_zero_fill_allocated(); | |
| 5184 } else { | |
| 5185 assert(r->is_empty(), "tautology"); | |
| 5186 if (r->popular()) { | |
| 5187 if (r->zero_fill_state() != HeapRegion::Allocated) { | |
| 5188 r->ensure_zero_filled_locked(); | |
| 5189 r->set_zero_fill_allocated(); | |
| 5190 } | |
| 5191 } else { | |
| 5192 _n++; | |
| 5193 switch (r->zero_fill_state()) { | |
| 5194 case HeapRegion::NotZeroFilled: | |
| 5195 case HeapRegion::ZeroFilling: | |
| 5196 _g1->put_region_on_unclean_list_locked(r); | |
| 5197 break; | |
| 5198 case HeapRegion::Allocated: | |
| 5199 r->set_zero_fill_complete(); | |
| 5200 // no break; go on to put on free list. | |
| 5201 case HeapRegion::ZeroFilled: | |
| 5202 _g1->put_free_region_on_list_locked(r); | |
| 5203 break; | |
| 5204 } | |
| 5205 } | |
| 5206 } | |
| 5207 return false; | |
| 5208 } | |
| 5209 | |
| 5210 int getFreeRegionCount() {return _n;} | |
| 5211 }; | |
| 5212 | |
| 5213 // Done at the end of full GC. | |
| 5214 void G1CollectedHeap::rebuild_region_lists() { | |
| 5215 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5216 // This needs to go at the end of the full GC. | |
| 5217 RegionResetter rs; | |
| 5218 heap_region_iterate(&rs); | |
| 5219 _free_regions = rs.getFreeRegionCount(); | |
| 5220 // Tell the ZF thread it may have work to do. | |
| 5221 if (should_zf()) ZF_mon->notify_all(); | |
| 5222 } | |
| 5223 | |
| 5224 class UsedRegionsNeedZeroFillSetter: public HeapRegionClosure { | |
| 5225 G1CollectedHeap* _g1; | |
| 5226 int _n; | |
| 5227 public: | |
| 5228 UsedRegionsNeedZeroFillSetter() : _g1(G1CollectedHeap::heap()), _n(0) {} | |
| 5229 bool doHeapRegion(HeapRegion* r) { | |
| 5230 if (r->continuesHumongous()) return false; | |
| 5231 if (r->top() > r->bottom()) { | |
| 5232 // There are assertions in "set_zero_fill_needed()" below that | |
| 5233 // require top() == bottom(), so this is technically illegal. | |
| 5234 // We'll skirt the law here, by making that true temporarily. | |
| 5235 DEBUG_ONLY(HeapWord* save_top = r->top(); | |
| 5236 r->set_top(r->bottom())); | |
| 5237 r->set_zero_fill_needed(); | |
| 5238 DEBUG_ONLY(r->set_top(save_top)); | |
| 5239 } | |
| 5240 return false; | |
| 5241 } | |
| 5242 }; | |
| 5243 | |
| 5244 // Done at the start of full GC. | |
| 5245 void G1CollectedHeap::set_used_regions_to_need_zero_fill() { | |
| 5246 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5247 // This needs to go at the end of the full GC. | |
| 5248 UsedRegionsNeedZeroFillSetter rs; | |
| 5249 heap_region_iterate(&rs); | |
| 5250 } | |
| 5251 | |
| 5252 class CountObjClosure: public ObjectClosure { | |
| 5253 size_t _n; | |
| 5254 public: | |
| 5255 CountObjClosure() : _n(0) {} | |
| 5256 void do_object(oop obj) { _n++; } | |
| 5257 size_t n() { return _n; } | |
| 5258 }; | |
| 5259 | |
| 5260 size_t G1CollectedHeap::pop_object_used_objs() { | |
| 5261 size_t sum_objs = 0; | |
| 5262 for (int i = 0; i < G1NumPopularRegions; i++) { | |
| 5263 CountObjClosure cl; | |
| 5264 _hrs->at(i)->object_iterate(&cl); | |
| 5265 sum_objs += cl.n(); | |
| 5266 } | |
| 5267 return sum_objs; | |
| 5268 } | |
| 5269 | |
| 5270 size_t G1CollectedHeap::pop_object_used_bytes() { | |
| 5271 size_t sum_bytes = 0; | |
| 5272 for (int i = 0; i < G1NumPopularRegions; i++) { | |
| 5273 sum_bytes += _hrs->at(i)->used(); | |
| 5274 } | |
| 5275 return sum_bytes; | |
| 5276 } | |
| 5277 | |
| 5278 | |
| 5279 static int nq = 0; | |
| 5280 | |
| 5281 HeapWord* G1CollectedHeap::allocate_popular_object(size_t word_size) { | |
| 5282 while (_cur_pop_hr_index < G1NumPopularRegions) { | |
| 5283 HeapRegion* cur_pop_region = _hrs->at(_cur_pop_hr_index); | |
| 5284 HeapWord* res = cur_pop_region->allocate(word_size); | |
| 5285 if (res != NULL) { | |
| 5286 // We account for popular objs directly in the used summary: | |
| 5287 _summary_bytes_used += (word_size * HeapWordSize); | |
| 5288 return res; | |
| 5289 } | |
| 5290 // Otherwise, try the next region (first making sure that we remember | |
| 5291 // the last "top" value as the "next_top_at_mark_start", so that | |
| 5292 // objects made popular during markings aren't automatically considered | |
| 5293 // live). | |
| 5294 cur_pop_region->note_end_of_copying(); | |
| 5295 // Otherwise, try the next region. | |
| 5296 _cur_pop_hr_index++; | |
| 5297 } | |
| 5298 // XXX: For now !!! | |
| 5299 vm_exit_out_of_memory(word_size, | |
| 5300 "Not enough pop obj space (To Be Fixed)"); | |
| 5301 return NULL; | |
| 5302 } | |
| 5303 | |
| 5304 class HeapRegionList: public CHeapObj { | |
| 5305 public: | |
| 5306 HeapRegion* hr; | |
| 5307 HeapRegionList* next; | |
| 5308 }; | |
| 5309 | |
| 5310 void G1CollectedHeap::schedule_popular_region_evac(HeapRegion* r) { | |
| 5311 // This might happen during parallel GC, so protect by this lock. | |
| 5312 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 5313 // We don't schedule regions whose evacuations are already pending, or | |
| 5314 // are already being evacuated. | |
| 5315 if (!r->popular_pending() && !r->in_collection_set()) { | |
| 5316 r->set_popular_pending(true); | |
| 5317 if (G1TracePopularity) { | |
| 5318 gclog_or_tty->print_cr("Scheduling region "PTR_FORMAT" " | |
| 5319 "["PTR_FORMAT", "PTR_FORMAT") for pop-object evacuation.", | |
| 5320 r, r->bottom(), r->end()); | |
| 5321 } | |
| 5322 HeapRegionList* hrl = new HeapRegionList; | |
| 5323 hrl->hr = r; | |
| 5324 hrl->next = _popular_regions_to_be_evacuated; | |
| 5325 _popular_regions_to_be_evacuated = hrl; | |
| 5326 } | |
| 5327 } | |
| 5328 | |
| 5329 HeapRegion* G1CollectedHeap::popular_region_to_evac() { | |
| 5330 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 5331 HeapRegion* res = NULL; | |
| 5332 while (_popular_regions_to_be_evacuated != NULL && res == NULL) { | |
| 5333 HeapRegionList* hrl = _popular_regions_to_be_evacuated; | |
| 5334 _popular_regions_to_be_evacuated = hrl->next; | |
| 5335 res = hrl->hr; | |
| 5336 // The G1RSPopLimit may have increased, so recheck here... | |
| 5337 if (res->rem_set()->occupied() < (size_t) G1RSPopLimit) { | |
| 5338 // Hah: don't need to schedule. | |
| 5339 if (G1TracePopularity) { | |
| 5340 gclog_or_tty->print_cr("Unscheduling region "PTR_FORMAT" " | |
| 5341 "["PTR_FORMAT", "PTR_FORMAT") " | |
| 5342 "for pop-object evacuation (size %d < limit %d)", | |
| 5343 res, res->bottom(), res->end(), | |
| 5344 res->rem_set()->occupied(), G1RSPopLimit); | |
| 5345 } | |
| 5346 res->set_popular_pending(false); | |
| 5347 res = NULL; | |
| 5348 } | |
| 5349 // We do not reset res->popular() here; if we did so, it would allow | |
| 5350 // the region to be "rescheduled" for popularity evacuation. Instead, | |
| 5351 // this is done in the collection pause, with the world stopped. | |
| 5352 // So the invariant is that the regions in the list have the popularity | |
| 5353 // boolean set, but having the boolean set does not imply membership | |
| 5354 // on the list (though there can at most one such pop-pending region | |
| 5355 // not on the list at any time). | |
| 5356 delete hrl; | |
| 5357 } | |
| 5358 return res; | |
| 5359 } | |
| 5360 | |
| 5361 void G1CollectedHeap::evac_popular_region(HeapRegion* hr) { | |
| 5362 while (true) { | |
| 5363 // Don't want to do a GC pause while cleanup is being completed! | |
| 5364 wait_for_cleanup_complete(); | |
| 5365 | |
| 5366 // Read the GC count while holding the Heap_lock | |
| 5367 int gc_count_before = SharedHeap::heap()->total_collections(); | |
| 5368 g1_policy()->record_stop_world_start(); | |
| 5369 | |
| 5370 { | |
| 5371 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
| 5372 VM_G1PopRegionCollectionPause op(gc_count_before, hr); | |
| 5373 VMThread::execute(&op); | |
| 5374 | |
| 5375 // If the prolog succeeded, we didn't do a GC for this. | |
| 5376 if (op.prologue_succeeded()) break; | |
| 5377 } | |
| 5378 // Otherwise we didn't. We should recheck the size, though, since | |
| 5379 // the limit may have increased... | |
| 5380 if (hr->rem_set()->occupied() < (size_t) G1RSPopLimit) { | |
| 5381 hr->set_popular_pending(false); | |
| 5382 break; | |
| 5383 } | |
| 5384 } | |
| 5385 } | |
| 5386 | |
| 5387 void G1CollectedHeap::atomic_inc_obj_rc(oop obj) { | |
| 5388 Atomic::inc(obj_rc_addr(obj)); | |
| 5389 } | |
| 5390 | |
| 5391 class CountRCClosure: public OopsInHeapRegionClosure { | |
| 5392 G1CollectedHeap* _g1h; | |
| 5393 bool _parallel; | |
| 5394 public: | |
| 5395 CountRCClosure(G1CollectedHeap* g1h) : | |
| 5396 _g1h(g1h), _parallel(ParallelGCThreads > 0) | |
| 5397 {} | |
| 5398 void do_oop(narrowOop* p) { | |
| 5399 guarantee(false, "NYI"); | |
| 5400 } | |
| 5401 void do_oop(oop* p) { | |
| 5402 oop obj = *p; | |
| 5403 assert(obj != NULL, "Precondition."); | |
| 5404 if (_parallel) { | |
| 5405 // We go sticky at the limit to avoid excess contention. | |
| 5406 // If we want to track the actual RC's further, we'll need to keep a | |
| 5407 // per-thread hash table or something for the popular objects. | |
| 5408 if (_g1h->obj_rc(obj) < G1ObjPopLimit) { | |
| 5409 _g1h->atomic_inc_obj_rc(obj); | |
| 5410 } | |
| 5411 } else { | |
| 5412 _g1h->inc_obj_rc(obj); | |
| 5413 } | |
| 5414 } | |
| 5415 }; | |
| 5416 | |
| 5417 class EvacPopObjClosure: public ObjectClosure { | |
| 5418 G1CollectedHeap* _g1h; | |
| 5419 size_t _pop_objs; | |
| 5420 size_t _max_rc; | |
| 5421 public: | |
| 5422 EvacPopObjClosure(G1CollectedHeap* g1h) : | |
| 5423 _g1h(g1h), _pop_objs(0), _max_rc(0) {} | |
| 5424 | |
| 5425 void do_object(oop obj) { | |
| 5426 size_t rc = _g1h->obj_rc(obj); | |
| 5427 _max_rc = MAX2(rc, _max_rc); | |
| 5428 if (rc >= (size_t) G1ObjPopLimit) { | |
| 5429 _g1h->_pop_obj_rc_at_copy.add((double)rc); | |
| 5430 size_t word_sz = obj->size(); | |
| 5431 HeapWord* new_pop_loc = _g1h->allocate_popular_object(word_sz); | |
| 5432 oop new_pop_obj = (oop)new_pop_loc; | |
| 5433 Copy::aligned_disjoint_words((HeapWord*)obj, new_pop_loc, word_sz); | |
| 5434 obj->forward_to(new_pop_obj); | |
| 5435 G1ScanAndBalanceClosure scan_and_balance(_g1h); | |
| 5436 new_pop_obj->oop_iterate_backwards(&scan_and_balance); | |
| 5437 // preserve "next" mark bit if marking is in progress. | |
| 5438 if (_g1h->mark_in_progress() && !_g1h->is_obj_ill(obj)) { | |
| 5439 _g1h->concurrent_mark()->markAndGrayObjectIfNecessary(new_pop_obj); | |
| 5440 } | |
| 5441 | |
| 5442 if (G1TracePopularity) { | |
| 5443 gclog_or_tty->print_cr("Found obj " PTR_FORMAT " of word size " SIZE_FORMAT | |
| 5444 " pop (%d), move to " PTR_FORMAT, | |
| 5445 (void*) obj, word_sz, | |
| 5446 _g1h->obj_rc(obj), (void*) new_pop_obj); | |
| 5447 } | |
| 5448 _pop_objs++; | |
| 5449 } | |
| 5450 } | |
| 5451 size_t pop_objs() { return _pop_objs; } | |
| 5452 size_t max_rc() { return _max_rc; } | |
| 5453 }; | |
| 5454 | |
| 5455 class G1ParCountRCTask : public AbstractGangTask { | |
| 5456 G1CollectedHeap* _g1h; | |
| 5457 BitMap _bm; | |
| 5458 | |
| 5459 size_t getNCards() { | |
| 5460 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
| 5461 / G1BlockOffsetSharedArray::N_bytes; | |
| 5462 } | |
| 5463 CountRCClosure _count_rc_closure; | |
| 5464 public: | |
| 5465 G1ParCountRCTask(G1CollectedHeap* g1h) : | |
| 5466 AbstractGangTask("G1 Par RC Count task"), | |
| 5467 _g1h(g1h), _bm(getNCards()), _count_rc_closure(g1h) | |
| 5468 {} | |
| 5469 | |
| 5470 void work(int i) { | |
| 5471 ResourceMark rm; | |
| 5472 HandleMark hm; | |
| 5473 _g1h->g1_rem_set()->oops_into_collection_set_do(&_count_rc_closure, i); | |
| 5474 } | |
| 5475 }; | |
| 5476 | |
| 5477 void G1CollectedHeap::popularity_pause_preamble(HeapRegion* popular_region) { | |
| 5478 // We're evacuating a single region (for popularity). | |
| 5479 if (G1TracePopularity) { | |
| 5480 gclog_or_tty->print_cr("Doing pop region pause for ["PTR_FORMAT", "PTR_FORMAT")", | |
| 5481 popular_region->bottom(), popular_region->end()); | |
| 5482 } | |
| 5483 g1_policy()->set_single_region_collection_set(popular_region); | |
| 5484 size_t max_rc; | |
| 5485 if (!compute_reference_counts_and_evac_popular(popular_region, | |
| 5486 &max_rc)) { | |
| 5487 // We didn't evacuate any popular objects. | |
| 5488 // We increase the RS popularity limit, to prevent this from | |
| 5489 // happening in the future. | |
| 5490 if (G1RSPopLimit < (1 << 30)) { | |
| 5491 G1RSPopLimit *= 2; | |
| 5492 } | |
| 5493 // For now, interesting enough for a message: | |
| 5494 #if 1 | |
| 5495 gclog_or_tty->print_cr("In pop region pause for ["PTR_FORMAT", "PTR_FORMAT"), " | |
| 5496 "failed to find a pop object (max = %d).", | |
| 5497 popular_region->bottom(), popular_region->end(), | |
| 5498 max_rc); | |
| 5499 gclog_or_tty->print_cr("Increased G1RSPopLimit to %d.", G1RSPopLimit); | |
| 5500 #endif // 0 | |
| 5501 // Also, we reset the collection set to NULL, to make the rest of | |
| 5502 // the collection do nothing. | |
| 5503 assert(popular_region->next_in_collection_set() == NULL, | |
| 5504 "should be single-region."); | |
| 5505 popular_region->set_in_collection_set(false); | |
| 5506 popular_region->set_popular_pending(false); | |
| 5507 g1_policy()->clear_collection_set(); | |
| 5508 } | |
| 5509 } | |
| 5510 | |
| 5511 bool G1CollectedHeap:: | |
| 5512 compute_reference_counts_and_evac_popular(HeapRegion* popular_region, | |
| 5513 size_t* max_rc) { | |
| 5514 HeapWord* rc_region_bot; | |
| 5515 HeapWord* rc_region_end; | |
| 5516 | |
| 5517 // Set up the reference count region. | |
| 5518 HeapRegion* rc_region = newAllocRegion(HeapRegion::GrainWords); | |
| 5519 if (rc_region != NULL) { | |
| 5520 rc_region_bot = rc_region->bottom(); | |
| 5521 rc_region_end = rc_region->end(); | |
| 5522 } else { | |
| 5523 rc_region_bot = NEW_C_HEAP_ARRAY(HeapWord, HeapRegion::GrainWords); | |
| 5524 if (rc_region_bot == NULL) { | |
| 5525 vm_exit_out_of_memory(HeapRegion::GrainWords, | |
| 5526 "No space for RC region."); | |
| 5527 } | |
| 5528 rc_region_end = rc_region_bot + HeapRegion::GrainWords; | |
| 5529 } | |
| 5530 | |
| 5531 if (G1TracePopularity) | |
| 5532 gclog_or_tty->print_cr("RC region is ["PTR_FORMAT", "PTR_FORMAT")", | |
| 5533 rc_region_bot, rc_region_end); | |
| 5534 if (rc_region_bot > popular_region->bottom()) { | |
| 5535 _rc_region_above = true; | |
| 5536 _rc_region_diff = | |
| 5537 pointer_delta(rc_region_bot, popular_region->bottom(), 1); | |
| 5538 } else { | |
| 5539 assert(rc_region_bot < popular_region->bottom(), "Can't be equal."); | |
| 5540 _rc_region_above = false; | |
| 5541 _rc_region_diff = | |
| 5542 pointer_delta(popular_region->bottom(), rc_region_bot, 1); | |
| 5543 } | |
| 5544 g1_policy()->record_pop_compute_rc_start(); | |
| 5545 // Count external references. | |
| 5546 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
| 5547 if (ParallelGCThreads > 0) { | |
| 5548 | |
| 5549 set_par_threads(workers()->total_workers()); | |
| 5550 G1ParCountRCTask par_count_rc_task(this); | |
| 5551 workers()->run_task(&par_count_rc_task); | |
| 5552 set_par_threads(0); | |
| 5553 | |
| 5554 } else { | |
| 5555 CountRCClosure count_rc_closure(this); | |
| 5556 g1_rem_set()->oops_into_collection_set_do(&count_rc_closure, 0); | |
| 5557 } | |
| 5558 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); | |
| 5559 g1_policy()->record_pop_compute_rc_end(); | |
| 5560 | |
| 5561 // Now evacuate popular objects. | |
| 5562 g1_policy()->record_pop_evac_start(); | |
| 5563 EvacPopObjClosure evac_pop_obj_cl(this); | |
| 5564 popular_region->object_iterate(&evac_pop_obj_cl); | |
| 5565 *max_rc = evac_pop_obj_cl.max_rc(); | |
| 5566 | |
| 5567 // Make sure the last "top" value of the current popular region is copied | |
| 5568 // as the "next_top_at_mark_start", so that objects made popular during | |
| 5569 // markings aren't automatically considered live. | |
| 5570 HeapRegion* cur_pop_region = _hrs->at(_cur_pop_hr_index); | |
| 5571 cur_pop_region->note_end_of_copying(); | |
| 5572 | |
| 5573 if (rc_region != NULL) { | |
| 5574 free_region(rc_region); | |
| 5575 } else { | |
| 5576 FREE_C_HEAP_ARRAY(HeapWord, rc_region_bot); | |
| 5577 } | |
| 5578 g1_policy()->record_pop_evac_end(); | |
| 5579 | |
| 5580 return evac_pop_obj_cl.pop_objs() > 0; | |
| 5581 } | |
| 5582 | |
| 5583 class CountPopObjInfoClosure: public HeapRegionClosure { | |
| 5584 size_t _objs; | |
| 5585 size_t _bytes; | |
| 5586 | |
| 5587 class CountObjClosure: public ObjectClosure { | |
| 5588 int _n; | |
| 5589 public: | |
| 5590 CountObjClosure() : _n(0) {} | |
| 5591 void do_object(oop obj) { _n++; } | |
| 5592 size_t n() { return _n; } | |
| 5593 }; | |
| 5594 | |
| 5595 public: | |
| 5596 CountPopObjInfoClosure() : _objs(0), _bytes(0) {} | |
| 5597 bool doHeapRegion(HeapRegion* r) { | |
| 5598 _bytes += r->used(); | |
| 5599 CountObjClosure blk; | |
| 5600 r->object_iterate(&blk); | |
| 5601 _objs += blk.n(); | |
| 5602 return false; | |
| 5603 } | |
| 5604 size_t objs() { return _objs; } | |
| 5605 size_t bytes() { return _bytes; } | |
| 5606 }; | |
| 5607 | |
| 5608 | |
| 5609 void G1CollectedHeap::print_popularity_summary_info() const { | |
| 5610 CountPopObjInfoClosure blk; | |
| 5611 for (int i = 0; i <= _cur_pop_hr_index; i++) { | |
| 5612 blk.doHeapRegion(_hrs->at(i)); | |
| 5613 } | |
| 5614 gclog_or_tty->print_cr("\nPopular objects: %d objs, %d bytes.", | |
| 5615 blk.objs(), blk.bytes()); | |
| 5616 gclog_or_tty->print_cr(" RC at copy = [avg = %5.2f, max = %5.2f, sd = %5.2f].", | |
| 5617 _pop_obj_rc_at_copy.avg(), | |
| 5618 _pop_obj_rc_at_copy.maximum(), | |
| 5619 _pop_obj_rc_at_copy.sd()); | |
| 5620 } | |
| 5621 | |
| 5622 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
| 5623 _refine_cte_cl->set_concurrent(concurrent); | |
| 5624 } | |
| 5625 | |
| 5626 #ifndef PRODUCT | |
| 5627 | |
| 5628 class PrintHeapRegionClosure: public HeapRegionClosure { | |
| 5629 public: | |
| 5630 bool doHeapRegion(HeapRegion *r) { | |
| 5631 gclog_or_tty->print("Region: "PTR_FORMAT":", r); | |
| 5632 if (r != NULL) { | |
| 5633 if (r->is_on_free_list()) | |
| 5634 gclog_or_tty->print("Free "); | |
| 5635 if (r->is_young()) | |
| 5636 gclog_or_tty->print("Young "); | |
| 5637 if (r->isHumongous()) | |
| 5638 gclog_or_tty->print("Is Humongous "); | |
| 5639 r->print(); | |
| 5640 } | |
| 5641 return false; | |
| 5642 } | |
| 5643 }; | |
| 5644 | |
| 5645 class SortHeapRegionClosure : public HeapRegionClosure { | |
| 5646 size_t young_regions,free_regions, unclean_regions; | |
| 5647 size_t hum_regions, count; | |
| 5648 size_t unaccounted, cur_unclean, cur_alloc; | |
| 5649 size_t total_free; | |
| 5650 HeapRegion* cur; | |
| 5651 public: | |
| 5652 SortHeapRegionClosure(HeapRegion *_cur) : cur(_cur), young_regions(0), | |
| 5653 free_regions(0), unclean_regions(0), | |
| 5654 hum_regions(0), | |
| 5655 count(0), unaccounted(0), | |
| 5656 cur_alloc(0), total_free(0) | |
| 5657 {} | |
| 5658 bool doHeapRegion(HeapRegion *r) { | |
| 5659 count++; | |
| 5660 if (r->is_on_free_list()) free_regions++; | |
| 5661 else if (r->is_on_unclean_list()) unclean_regions++; | |
| 5662 else if (r->isHumongous()) hum_regions++; | |
| 5663 else if (r->is_young()) young_regions++; | |
| 5664 else if (r == cur) cur_alloc++; | |
| 5665 else unaccounted++; | |
| 5666 return false; | |
| 5667 } | |
| 5668 void print() { | |
| 5669 total_free = free_regions + unclean_regions; | |
| 5670 gclog_or_tty->print("%d regions\n", count); | |
| 5671 gclog_or_tty->print("%d free: free_list = %d unclean = %d\n", | |
| 5672 total_free, free_regions, unclean_regions); | |
| 5673 gclog_or_tty->print("%d humongous %d young\n", | |
| 5674 hum_regions, young_regions); | |
| 5675 gclog_or_tty->print("%d cur_alloc\n", cur_alloc); | |
| 5676 gclog_or_tty->print("UHOH unaccounted = %d\n", unaccounted); | |
| 5677 } | |
| 5678 }; | |
| 5679 | |
| 5680 void G1CollectedHeap::print_region_counts() { | |
| 5681 SortHeapRegionClosure sc(_cur_alloc_region); | |
| 5682 PrintHeapRegionClosure cl; | |
| 5683 heap_region_iterate(&cl); | |
| 5684 heap_region_iterate(&sc); | |
| 5685 sc.print(); | |
| 5686 print_region_accounting_info(); | |
| 5687 }; | |
| 5688 | |
| 5689 bool G1CollectedHeap::regions_accounted_for() { | |
| 5690 // TODO: regions accounting for young/survivor/tenured | |
| 5691 return true; | |
| 5692 } | |
| 5693 | |
| 5694 bool G1CollectedHeap::print_region_accounting_info() { | |
| 5695 gclog_or_tty->print_cr("P regions: %d.", G1NumPopularRegions); | |
| 5696 gclog_or_tty->print_cr("Free regions: %d (count: %d count list %d) (clean: %d unclean: %d).", | |
| 5697 free_regions(), | |
| 5698 count_free_regions(), count_free_regions_list(), | |
| 5699 _free_region_list_size, _unclean_region_list.sz()); | |
| 5700 gclog_or_tty->print_cr("cur_alloc: %d.", | |
| 5701 (_cur_alloc_region == NULL ? 0 : 1)); | |
| 5702 gclog_or_tty->print_cr("H regions: %d.", _num_humongous_regions); | |
| 5703 | |
| 5704 // TODO: check regions accounting for young/survivor/tenured | |
| 5705 return true; | |
| 5706 } | |
| 5707 | |
| 5708 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
| 5709 HeapRegion* hr = heap_region_containing(p); | |
| 5710 if (hr == NULL) { | |
| 5711 return is_in_permanent(p); | |
| 5712 } else { | |
| 5713 return hr->is_in(p); | |
| 5714 } | |
| 5715 } | |
| 5716 #endif // PRODUCT | |
| 5717 | |
| 5718 void G1CollectedHeap::g1_unimplemented() { | |
| 5719 // Unimplemented(); | |
| 5720 } | |
| 5721 | |
| 5722 | |
| 5723 // Local Variables: *** | |
| 5724 // c-indentation-style: gnu *** | |
| 5725 // End: *** |