Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 4023:c6a6e936dc68
7096030: G1: PrintGCDetails enhancements
7102445: G1: Unnecessary Resource allocations during RSet scanning
Summary: Add a new per-worker thread line in the PrintGCDetails output. GC Worker Other is the difference between the elapsed time for the parallel phase of the evacuation pause and the sum of the times of the sub-phases (external root scanning, mark stack scanning, RSet updating, RSet scanning, object copying, and termination) for that worker. During RSet scanning, stack allocate DirtyCardToOopClosure objects; allocating these in a resource area was causing abnormally high GC Worker Other times while the worker thread freed ResourceArea chunks.
Reviewed-by: tonyp, jwilhelm, brutisso
| author | johnc |
|---|---|
| date | Sun, 23 Oct 2011 23:06:06 -0700 |
| parents | bf2d2b8b1726 |
| children | 8aae2050e83e |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "code/icBuffer.hpp" | |
| 27 #include "gc_implementation/g1/bufferingOopClosure.hpp" | |
| 28 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
| 29 #include "gc_implementation/g1/concurrentG1RefineThread.hpp" | |
| 30 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
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31 #include "gc_implementation/g1/g1AllocRegion.inline.hpp" |
| 1972 | 32 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
| 33 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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34 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
| 1972 | 35 #include "gc_implementation/g1/g1MarkSweep.hpp" |
| 36 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
| 37 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
| 38 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
| 39 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
| 40 #include "gc_implementation/g1/vm_operations_g1.hpp" | |
| 41 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
| 42 #include "memory/gcLocker.inline.hpp" | |
| 43 #include "memory/genOopClosures.inline.hpp" | |
| 44 #include "memory/generationSpec.hpp" | |
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45 #include "memory/referenceProcessor.hpp" |
| 1972 | 46 #include "oops/oop.inline.hpp" |
| 47 #include "oops/oop.pcgc.inline.hpp" | |
| 48 #include "runtime/aprofiler.hpp" | |
| 49 #include "runtime/vmThread.hpp" | |
| 342 | 50 |
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51 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0; |
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52 |
| 342 | 53 // turn it on so that the contents of the young list (scan-only / |
| 54 // to-be-collected) are printed at "strategic" points before / during | |
| 55 // / after the collection --- this is useful for debugging | |
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56 #define YOUNG_LIST_VERBOSE 0 |
| 342 | 57 // CURRENT STATUS |
| 58 // This file is under construction. Search for "FIXME". | |
| 59 | |
| 60 // INVARIANTS/NOTES | |
| 61 // | |
| 62 // All allocation activity covered by the G1CollectedHeap interface is | |
| 1973 | 63 // serialized by acquiring the HeapLock. This happens in mem_allocate |
| 64 // and allocate_new_tlab, which are the "entry" points to the | |
| 65 // allocation code from the rest of the JVM. (Note that this does not | |
| 66 // apply to TLAB allocation, which is not part of this interface: it | |
| 67 // is done by clients of this interface.) | |
| 342 | 68 |
| 69 // Local to this file. | |
| 70 | |
| 71 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
| 72 SuspendibleThreadSet* _sts; | |
| 73 G1RemSet* _g1rs; | |
| 74 ConcurrentG1Refine* _cg1r; | |
| 75 bool _concurrent; | |
| 76 public: | |
| 77 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
| 78 G1RemSet* g1rs, | |
| 79 ConcurrentG1Refine* cg1r) : | |
| 80 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
| 81 {} | |
| 82 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 1705 | 83 bool oops_into_cset = _g1rs->concurrentRefineOneCard(card_ptr, worker_i, false); |
| 84 // This path is executed by the concurrent refine or mutator threads, | |
| 85 // concurrently, and so we do not care if card_ptr contains references | |
| 86 // that point into the collection set. | |
| 87 assert(!oops_into_cset, "should be"); | |
| 88 | |
| 342 | 89 if (_concurrent && _sts->should_yield()) { |
| 90 // Caller will actually yield. | |
| 91 return false; | |
| 92 } | |
| 93 // Otherwise, we finished successfully; return true. | |
| 94 return true; | |
| 95 } | |
| 96 void set_concurrent(bool b) { _concurrent = b; } | |
| 97 }; | |
| 98 | |
| 99 | |
| 100 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 101 int _calls; | |
| 102 G1CollectedHeap* _g1h; | |
| 103 CardTableModRefBS* _ctbs; | |
| 104 int _histo[256]; | |
| 105 public: | |
| 106 ClearLoggedCardTableEntryClosure() : | |
| 107 _calls(0) | |
| 108 { | |
| 109 _g1h = G1CollectedHeap::heap(); | |
| 110 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 111 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
| 112 } | |
| 113 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 114 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 115 _calls++; | |
| 116 unsigned char* ujb = (unsigned char*)card_ptr; | |
| 117 int ind = (int)(*ujb); | |
| 118 _histo[ind]++; | |
| 119 *card_ptr = -1; | |
| 120 } | |
| 121 return true; | |
| 122 } | |
| 123 int calls() { return _calls; } | |
| 124 void print_histo() { | |
| 125 gclog_or_tty->print_cr("Card table value histogram:"); | |
| 126 for (int i = 0; i < 256; i++) { | |
| 127 if (_histo[i] != 0) { | |
| 128 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
| 129 } | |
| 130 } | |
| 131 } | |
| 132 }; | |
| 133 | |
| 134 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 135 int _calls; | |
| 136 G1CollectedHeap* _g1h; | |
| 137 CardTableModRefBS* _ctbs; | |
| 138 public: | |
| 139 RedirtyLoggedCardTableEntryClosure() : | |
| 140 _calls(0) | |
| 141 { | |
| 142 _g1h = G1CollectedHeap::heap(); | |
| 143 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 144 } | |
| 145 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 146 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 147 _calls++; | |
| 148 *card_ptr = 0; | |
| 149 } | |
| 150 return true; | |
| 151 } | |
| 152 int calls() { return _calls; } | |
| 153 }; | |
| 154 | |
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155 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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156 public: |
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157 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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158 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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159 return true; |
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160 } |
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161 }; |
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162 |
| 342 | 163 YoungList::YoungList(G1CollectedHeap* g1h) |
| 164 : _g1h(g1h), _head(NULL), | |
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165 _length(0), |
| 342 | 166 _last_sampled_rs_lengths(0), |
| 545 | 167 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) |
| 342 | 168 { |
| 169 guarantee( check_list_empty(false), "just making sure..." ); | |
| 170 } | |
| 171 | |
| 172 void YoungList::push_region(HeapRegion *hr) { | |
| 173 assert(!hr->is_young(), "should not already be young"); | |
| 174 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
| 175 | |
| 176 hr->set_next_young_region(_head); | |
| 177 _head = hr; | |
| 178 | |
| 179 hr->set_young(); | |
| 180 double yg_surv_rate = _g1h->g1_policy()->predict_yg_surv_rate((int)_length); | |
| 181 ++_length; | |
| 182 } | |
| 183 | |
| 184 void YoungList::add_survivor_region(HeapRegion* hr) { | |
| 545 | 185 assert(hr->is_survivor(), "should be flagged as survivor region"); |
| 342 | 186 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
| 187 | |
| 188 hr->set_next_young_region(_survivor_head); | |
| 189 if (_survivor_head == NULL) { | |
| 545 | 190 _survivor_tail = hr; |
| 342 | 191 } |
| 192 _survivor_head = hr; | |
| 193 | |
| 194 ++_survivor_length; | |
| 195 } | |
| 196 | |
| 197 void YoungList::empty_list(HeapRegion* list) { | |
| 198 while (list != NULL) { | |
| 199 HeapRegion* next = list->get_next_young_region(); | |
| 200 list->set_next_young_region(NULL); | |
| 201 list->uninstall_surv_rate_group(); | |
| 202 list->set_not_young(); | |
| 203 list = next; | |
| 204 } | |
| 205 } | |
| 206 | |
| 207 void YoungList::empty_list() { | |
| 208 assert(check_list_well_formed(), "young list should be well formed"); | |
| 209 | |
| 210 empty_list(_head); | |
| 211 _head = NULL; | |
| 212 _length = 0; | |
| 213 | |
| 214 empty_list(_survivor_head); | |
| 215 _survivor_head = NULL; | |
| 545 | 216 _survivor_tail = NULL; |
| 342 | 217 _survivor_length = 0; |
| 218 | |
| 219 _last_sampled_rs_lengths = 0; | |
| 220 | |
| 221 assert(check_list_empty(false), "just making sure..."); | |
| 222 } | |
| 223 | |
| 224 bool YoungList::check_list_well_formed() { | |
| 225 bool ret = true; | |
| 226 | |
| 227 size_t length = 0; | |
| 228 HeapRegion* curr = _head; | |
| 229 HeapRegion* last = NULL; | |
| 230 while (curr != NULL) { | |
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231 if (!curr->is_young()) { |
| 342 | 232 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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233 "incorrectly tagged (y: %d, surv: %d)", |
| 342 | 234 curr->bottom(), curr->end(), |
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235 curr->is_young(), curr->is_survivor()); |
| 342 | 236 ret = false; |
| 237 } | |
| 238 ++length; | |
| 239 last = curr; | |
| 240 curr = curr->get_next_young_region(); | |
| 241 } | |
| 242 ret = ret && (length == _length); | |
| 243 | |
| 244 if (!ret) { | |
| 245 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
| 246 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
| 247 length, _length); | |
| 248 } | |
| 249 | |
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250 return ret; |
| 342 | 251 } |
| 252 | |
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253 bool YoungList::check_list_empty(bool check_sample) { |
| 342 | 254 bool ret = true; |
| 255 | |
| 256 if (_length != 0) { | |
| 257 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
| 258 _length); | |
| 259 ret = false; | |
| 260 } | |
| 261 if (check_sample && _last_sampled_rs_lengths != 0) { | |
| 262 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
| 263 ret = false; | |
| 264 } | |
| 265 if (_head != NULL) { | |
| 266 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
| 267 ret = false; | |
| 268 } | |
| 269 if (!ret) { | |
| 270 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
| 271 } | |
| 272 | |
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273 return ret; |
| 342 | 274 } |
| 275 | |
| 276 void | |
| 277 YoungList::rs_length_sampling_init() { | |
| 278 _sampled_rs_lengths = 0; | |
| 279 _curr = _head; | |
| 280 } | |
| 281 | |
| 282 bool | |
| 283 YoungList::rs_length_sampling_more() { | |
| 284 return _curr != NULL; | |
| 285 } | |
| 286 | |
| 287 void | |
| 288 YoungList::rs_length_sampling_next() { | |
| 289 assert( _curr != NULL, "invariant" ); | |
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290 size_t rs_length = _curr->rem_set()->occupied(); |
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291 |
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292 _sampled_rs_lengths += rs_length; |
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293 |
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294 // The current region may not yet have been added to the |
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295 // incremental collection set (it gets added when it is |
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296 // retired as the current allocation region). |
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297 if (_curr->in_collection_set()) { |
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298 // Update the collection set policy information for this region |
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299 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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300 } |
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301 |
| 342 | 302 _curr = _curr->get_next_young_region(); |
| 303 if (_curr == NULL) { | |
| 304 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
| 305 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
| 306 } | |
| 307 } | |
| 308 | |
| 309 void | |
| 310 YoungList::reset_auxilary_lists() { | |
| 311 guarantee( is_empty(), "young list should be empty" ); | |
| 312 assert(check_list_well_formed(), "young list should be well formed"); | |
| 313 | |
| 314 // Add survivor regions to SurvRateGroup. | |
| 315 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
| 545 | 316 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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317 |
| 342 | 318 for (HeapRegion* curr = _survivor_head; |
| 319 curr != NULL; | |
| 320 curr = curr->get_next_young_region()) { | |
| 321 _g1h->g1_policy()->set_region_survivors(curr); | |
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322 |
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323 // The region is a non-empty survivor so let's add it to |
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324 // the incremental collection set for the next evacuation |
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325 // pause. |
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326 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
| 342 | 327 } |
| 328 _g1h->g1_policy()->note_stop_adding_survivor_regions(); | |
| 329 | |
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330 _head = _survivor_head; |
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331 _length = _survivor_length; |
| 342 | 332 if (_survivor_head != NULL) { |
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333 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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334 assert(_survivor_length > 0, "invariant"); |
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335 _survivor_tail->set_next_young_region(NULL); |
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336 } |
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337 |
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338 // Don't clear the survivor list handles until the start of |
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339 // the next evacuation pause - we need it in order to re-tag |
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340 // the survivor regions from this evacuation pause as 'young' |
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341 // at the start of the next. |
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342 |
| 545 | 343 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
| 342 | 344 |
| 345 assert(check_list_well_formed(), "young list should be well formed"); | |
| 346 } | |
| 347 | |
| 348 void YoungList::print() { | |
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349 HeapRegion* lists[] = {_head, _survivor_head}; |
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350 const char* names[] = {"YOUNG", "SURVIVOR"}; |
| 342 | 351 |
| 352 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
| 353 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
| 354 HeapRegion *curr = lists[list]; | |
| 355 if (curr == NULL) | |
| 356 gclog_or_tty->print_cr(" empty"); | |
| 357 while (curr != NULL) { | |
| 358 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
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359 "age: %4d, y: %d, surv: %d", |
| 342 | 360 curr->bottom(), curr->end(), |
| 361 curr->top(), | |
| 362 curr->prev_top_at_mark_start(), | |
| 363 curr->next_top_at_mark_start(), | |
| 364 curr->top_at_conc_mark_count(), | |
| 365 curr->age_in_surv_rate_group_cond(), | |
| 366 curr->is_young(), | |
| 367 curr->is_survivor()); | |
| 368 curr = curr->get_next_young_region(); | |
| 369 } | |
| 370 } | |
| 371 | |
| 372 gclog_or_tty->print_cr(""); | |
| 373 } | |
| 374 | |
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375 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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376 { |
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377 // Claim the right to put the region on the dirty cards region list |
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378 // by installing a self pointer. |
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379 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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380 if (next == NULL) { |
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381 HeapRegion* res = (HeapRegion*) |
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382 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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383 NULL); |
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384 if (res == NULL) { |
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385 HeapRegion* head; |
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386 do { |
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387 // Put the region to the dirty cards region list. |
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388 head = _dirty_cards_region_list; |
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389 next = (HeapRegion*) |
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390 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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391 if (next == head) { |
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392 assert(hr->get_next_dirty_cards_region() == hr, |
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393 "hr->get_next_dirty_cards_region() != hr"); |
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394 if (next == NULL) { |
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395 // The last region in the list points to itself. |
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396 hr->set_next_dirty_cards_region(hr); |
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397 } else { |
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398 hr->set_next_dirty_cards_region(next); |
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399 } |
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400 } |
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401 } while (next != head); |
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402 } |
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403 } |
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404 } |
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405 |
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406 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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407 { |
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408 HeapRegion* head; |
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409 HeapRegion* hr; |
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410 do { |
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411 head = _dirty_cards_region_list; |
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412 if (head == NULL) { |
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413 return NULL; |
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414 } |
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415 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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416 if (head == new_head) { |
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417 // The last region. |
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418 new_head = NULL; |
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419 } |
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420 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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421 head); |
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422 } while (hr != head); |
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423 assert(hr != NULL, "invariant"); |
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424 hr->set_next_dirty_cards_region(NULL); |
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425 return hr; |
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426 } |
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427 |
| 342 | 428 void G1CollectedHeap::stop_conc_gc_threads() { |
| 794 | 429 _cg1r->stop(); |
| 342 | 430 _cmThread->stop(); |
| 431 } | |
| 432 | |
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433 #ifdef ASSERT |
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434 // A region is added to the collection set as it is retired |
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435 // so an address p can point to a region which will be in the |
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436 // collection set but has not yet been retired. This method |
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437 // therefore is only accurate during a GC pause after all |
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438 // regions have been retired. It is used for debugging |
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439 // to check if an nmethod has references to objects that can |
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440 // be move during a partial collection. Though it can be |
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441 // inaccurate, it is sufficient for G1 because the conservative |
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442 // implementation of is_scavengable() for G1 will indicate that |
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443 // all nmethods must be scanned during a partial collection. |
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444 bool G1CollectedHeap::is_in_partial_collection(const void* p) { |
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445 HeapRegion* hr = heap_region_containing(p); |
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446 return hr != NULL && hr->in_collection_set(); |
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447 } |
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448 #endif |
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449 |
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450 // Returns true if the reference points to an object that |
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451 // can move in an incremental collecction. |
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452 bool G1CollectedHeap::is_scavengable(const void* p) { |
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453 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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454 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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455 HeapRegion* hr = heap_region_containing(p); |
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456 if (hr == NULL) { |
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457 // perm gen (or null) |
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458 return false; |
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459 } else { |
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460 return !hr->isHumongous(); |
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461 } |
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462 } |
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463 |
| 342 | 464 void G1CollectedHeap::check_ct_logs_at_safepoint() { |
| 465 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 466 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
| 467 | |
| 468 // Count the dirty cards at the start. | |
| 469 CountNonCleanMemRegionClosure count1(this); | |
| 470 ct_bs->mod_card_iterate(&count1); | |
| 471 int orig_count = count1.n(); | |
| 472 | |
| 473 // First clear the logged cards. | |
| 474 ClearLoggedCardTableEntryClosure clear; | |
| 475 dcqs.set_closure(&clear); | |
| 476 dcqs.apply_closure_to_all_completed_buffers(); | |
| 477 dcqs.iterate_closure_all_threads(false); | |
| 478 clear.print_histo(); | |
| 479 | |
| 480 // Now ensure that there's no dirty cards. | |
| 481 CountNonCleanMemRegionClosure count2(this); | |
| 482 ct_bs->mod_card_iterate(&count2); | |
| 483 if (count2.n() != 0) { | |
| 484 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
| 485 count2.n(), orig_count); | |
| 486 } | |
| 487 guarantee(count2.n() == 0, "Card table should be clean."); | |
| 488 | |
| 489 RedirtyLoggedCardTableEntryClosure redirty; | |
| 490 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
| 491 dcqs.apply_closure_to_all_completed_buffers(); | |
| 492 dcqs.iterate_closure_all_threads(false); | |
| 493 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
| 494 clear.calls(), orig_count); | |
| 495 guarantee(redirty.calls() == clear.calls(), | |
| 496 "Or else mechanism is broken."); | |
| 497 | |
| 498 CountNonCleanMemRegionClosure count3(this); | |
| 499 ct_bs->mod_card_iterate(&count3); | |
| 500 if (count3.n() != orig_count) { | |
| 501 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
| 502 orig_count, count3.n()); | |
| 503 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
| 504 } | |
| 505 | |
| 506 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 507 } | |
| 508 | |
| 509 // Private class members. | |
| 510 | |
| 511 G1CollectedHeap* G1CollectedHeap::_g1h; | |
| 512 | |
| 513 // Private methods. | |
| 514 | |
| 2152 | 515 HeapRegion* |
| 2361 | 516 G1CollectedHeap::new_region_try_secondary_free_list() { |
| 2152 | 517 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
| 518 while (!_secondary_free_list.is_empty() || free_regions_coming()) { | |
| 519 if (!_secondary_free_list.is_empty()) { | |
| 520 if (G1ConcRegionFreeingVerbose) { | |
| 521 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 522 "secondary_free_list has "SIZE_FORMAT" entries", | |
| 523 _secondary_free_list.length()); | |
| 524 } | |
| 525 // It looks as if there are free regions available on the | |
| 526 // secondary_free_list. Let's move them to the free_list and try | |
| 527 // again to allocate from it. | |
| 528 append_secondary_free_list(); | |
| 529 | |
| 530 assert(!_free_list.is_empty(), "if the secondary_free_list was not " | |
| 531 "empty we should have moved at least one entry to the free_list"); | |
| 532 HeapRegion* res = _free_list.remove_head(); | |
| 533 if (G1ConcRegionFreeingVerbose) { | |
| 534 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 535 "allocated "HR_FORMAT" from secondary_free_list", | |
| 536 HR_FORMAT_PARAMS(res)); | |
| 537 } | |
| 538 return res; | |
| 539 } | |
| 540 | |
| 541 // Wait here until we get notifed either when (a) there are no | |
| 542 // more free regions coming or (b) some regions have been moved on | |
| 543 // the secondary_free_list. | |
| 544 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 545 } | |
| 546 | |
| 547 if (G1ConcRegionFreeingVerbose) { | |
| 548 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 549 "could not allocate from secondary_free_list"); | |
| 550 } | |
| 551 return NULL; | |
| 552 } | |
| 553 | |
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554 HeapRegion* G1CollectedHeap::new_region(size_t word_size, bool do_expand) { |
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555 assert(!isHumongous(word_size) || word_size <= HeapRegion::GrainWords, |
| 2152 | 556 "the only time we use this to allocate a humongous region is " |
| 557 "when we are allocating a single humongous region"); | |
| 558 | |
| 559 HeapRegion* res; | |
| 560 if (G1StressConcRegionFreeing) { | |
| 561 if (!_secondary_free_list.is_empty()) { | |
| 562 if (G1ConcRegionFreeingVerbose) { | |
| 563 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 564 "forced to look at the secondary_free_list"); | |
| 565 } | |
| 2361 | 566 res = new_region_try_secondary_free_list(); |
| 2152 | 567 if (res != NULL) { |
| 568 return res; | |
| 569 } | |
| 570 } | |
| 571 } | |
| 572 res = _free_list.remove_head_or_null(); | |
| 573 if (res == NULL) { | |
| 574 if (G1ConcRegionFreeingVerbose) { | |
| 575 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 576 "res == NULL, trying the secondary_free_list"); | |
| 577 } | |
| 2361 | 578 res = new_region_try_secondary_free_list(); |
| 2152 | 579 } |
| 342 | 580 if (res == NULL && do_expand) { |
|
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581 ergo_verbose1(ErgoHeapSizing, |
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582 "attempt heap expansion", |
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583 ergo_format_reason("region allocation request failed") |
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584 ergo_format_byte("allocation request"), |
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585 word_size * HeapWordSize); |
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586 if (expand(word_size * HeapWordSize)) { |
| 3766 | 587 // Even though the heap was expanded, it might not have reached |
| 588 // the desired size. So, we cannot assume that the allocation | |
| 589 // will succeed. | |
| 590 res = _free_list.remove_head_or_null(); | |
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591 } |
| 342 | 592 } |
| 593 return res; | |
| 594 } | |
| 595 | |
| 3766 | 596 size_t G1CollectedHeap::humongous_obj_allocate_find_first(size_t num_regions, |
| 597 size_t word_size) { | |
| 2361 | 598 assert(isHumongous(word_size), "word_size should be humongous"); |
| 599 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
| 600 | |
| 3766 | 601 size_t first = G1_NULL_HRS_INDEX; |
| 2152 | 602 if (num_regions == 1) { |
| 603 // Only one region to allocate, no need to go through the slower | |
| 604 // path. The caller will attempt the expasion if this fails, so | |
| 605 // let's not try to expand here too. | |
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606 HeapRegion* hr = new_region(word_size, false /* do_expand */); |
| 2152 | 607 if (hr != NULL) { |
| 608 first = hr->hrs_index(); | |
| 609 } else { | |
| 3766 | 610 first = G1_NULL_HRS_INDEX; |
| 2152 | 611 } |
| 612 } else { | |
| 613 // We can't allocate humongous regions while cleanupComplete() is | |
| 614 // running, since some of the regions we find to be empty might not | |
| 615 // yet be added to the free list and it is not straightforward to | |
| 616 // know which list they are on so that we can remove them. Note | |
| 617 // that we only need to do this if we need to allocate more than | |
| 618 // one region to satisfy the current humongous allocation | |
| 619 // request. If we are only allocating one region we use the common | |
| 620 // region allocation code (see above). | |
| 621 wait_while_free_regions_coming(); | |
| 2361 | 622 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 623 |
| 624 if (free_regions() >= num_regions) { | |
| 3766 | 625 first = _hrs.find_contiguous(num_regions); |
| 626 if (first != G1_NULL_HRS_INDEX) { | |
| 627 for (size_t i = first; i < first + num_regions; ++i) { | |
| 628 HeapRegion* hr = region_at(i); | |
| 2152 | 629 assert(hr->is_empty(), "sanity"); |
| 2361 | 630 assert(is_on_master_free_list(hr), "sanity"); |
| 2152 | 631 hr->set_pending_removal(true); |
| 632 } | |
| 633 _free_list.remove_all_pending(num_regions); | |
| 634 } | |
| 635 } | |
| 636 } | |
| 637 return first; | |
| 638 } | |
| 639 | |
| 2361 | 640 HeapWord* |
| 3766 | 641 G1CollectedHeap::humongous_obj_allocate_initialize_regions(size_t first, |
| 2361 | 642 size_t num_regions, |
| 643 size_t word_size) { | |
| 3766 | 644 assert(first != G1_NULL_HRS_INDEX, "pre-condition"); |
| 2361 | 645 assert(isHumongous(word_size), "word_size should be humongous"); |
| 646 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
| 647 | |
| 648 // Index of last region in the series + 1. | |
| 3766 | 649 size_t last = first + num_regions; |
| 2361 | 650 |
| 651 // We need to initialize the region(s) we just discovered. This is | |
| 652 // a bit tricky given that it can happen concurrently with | |
| 653 // refinement threads refining cards on these regions and | |
| 654 // potentially wanting to refine the BOT as they are scanning | |
| 655 // those cards (this can happen shortly after a cleanup; see CR | |
| 656 // 6991377). So we have to set up the region(s) carefully and in | |
| 657 // a specific order. | |
| 658 | |
| 659 // The word size sum of all the regions we will allocate. | |
| 660 size_t word_size_sum = num_regions * HeapRegion::GrainWords; | |
| 661 assert(word_size <= word_size_sum, "sanity"); | |
| 662 | |
| 663 // This will be the "starts humongous" region. | |
| 3766 | 664 HeapRegion* first_hr = region_at(first); |
| 2361 | 665 // The header of the new object will be placed at the bottom of |
| 666 // the first region. | |
| 667 HeapWord* new_obj = first_hr->bottom(); | |
| 668 // This will be the new end of the first region in the series that | |
| 669 // should also match the end of the last region in the seriers. | |
| 670 HeapWord* new_end = new_obj + word_size_sum; | |
| 671 // This will be the new top of the first region that will reflect | |
| 672 // this allocation. | |
| 673 HeapWord* new_top = new_obj + word_size; | |
| 674 | |
| 675 // First, we need to zero the header of the space that we will be | |
| 676 // allocating. When we update top further down, some refinement | |
| 677 // threads might try to scan the region. By zeroing the header we | |
| 678 // ensure that any thread that will try to scan the region will | |
| 679 // come across the zero klass word and bail out. | |
| 680 // | |
| 681 // NOTE: It would not have been correct to have used | |
| 682 // CollectedHeap::fill_with_object() and make the space look like | |
| 683 // an int array. The thread that is doing the allocation will | |
| 684 // later update the object header to a potentially different array | |
| 685 // type and, for a very short period of time, the klass and length | |
| 686 // fields will be inconsistent. This could cause a refinement | |
| 687 // thread to calculate the object size incorrectly. | |
| 688 Copy::fill_to_words(new_obj, oopDesc::header_size(), 0); | |
| 689 | |
| 690 // We will set up the first region as "starts humongous". This | |
| 691 // will also update the BOT covering all the regions to reflect | |
| 692 // that there is a single object that starts at the bottom of the | |
| 693 // first region. | |
| 694 first_hr->set_startsHumongous(new_top, new_end); | |
| 695 | |
| 696 // Then, if there are any, we will set up the "continues | |
| 697 // humongous" regions. | |
| 698 HeapRegion* hr = NULL; | |
| 3766 | 699 for (size_t i = first + 1; i < last; ++i) { |
| 700 hr = region_at(i); | |
| 2361 | 701 hr->set_continuesHumongous(first_hr); |
| 702 } | |
| 703 // If we have "continues humongous" regions (hr != NULL), then the | |
| 704 // end of the last one should match new_end. | |
| 705 assert(hr == NULL || hr->end() == new_end, "sanity"); | |
| 706 | |
| 707 // Up to this point no concurrent thread would have been able to | |
| 708 // do any scanning on any region in this series. All the top | |
| 709 // fields still point to bottom, so the intersection between | |
| 710 // [bottom,top] and [card_start,card_end] will be empty. Before we | |
| 711 // update the top fields, we'll do a storestore to make sure that | |
| 712 // no thread sees the update to top before the zeroing of the | |
| 713 // object header and the BOT initialization. | |
| 714 OrderAccess::storestore(); | |
| 715 | |
| 716 // Now that the BOT and the object header have been initialized, | |
| 717 // we can update top of the "starts humongous" region. | |
| 718 assert(first_hr->bottom() < new_top && new_top <= first_hr->end(), | |
| 719 "new_top should be in this region"); | |
| 720 first_hr->set_top(new_top); | |
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721 if (_hr_printer.is_active()) { |
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722 HeapWord* bottom = first_hr->bottom(); |
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723 HeapWord* end = first_hr->orig_end(); |
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724 if ((first + 1) == last) { |
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725 // the series has a single humongous region |
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726 _hr_printer.alloc(G1HRPrinter::SingleHumongous, first_hr, new_top); |
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727 } else { |
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728 // the series has more than one humongous regions |
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729 _hr_printer.alloc(G1HRPrinter::StartsHumongous, first_hr, end); |
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730 } |
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731 } |
| 2361 | 732 |
| 733 // Now, we will update the top fields of the "continues humongous" | |
| 734 // regions. The reason we need to do this is that, otherwise, | |
| 735 // these regions would look empty and this will confuse parts of | |
| 736 // G1. For example, the code that looks for a consecutive number | |
| 737 // of empty regions will consider them empty and try to | |
| 738 // re-allocate them. We can extend is_empty() to also include | |
| 739 // !continuesHumongous(), but it is easier to just update the top | |
| 740 // fields here. The way we set top for all regions (i.e., top == | |
| 741 // end for all regions but the last one, top == new_top for the | |
| 742 // last one) is actually used when we will free up the humongous | |
| 743 // region in free_humongous_region(). | |
| 744 hr = NULL; | |
| 3766 | 745 for (size_t i = first + 1; i < last; ++i) { |
| 746 hr = region_at(i); | |
| 2361 | 747 if ((i + 1) == last) { |
| 748 // last continues humongous region | |
| 749 assert(hr->bottom() < new_top && new_top <= hr->end(), | |
| 750 "new_top should fall on this region"); | |
| 751 hr->set_top(new_top); | |
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752 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, new_top); |
| 2361 | 753 } else { |
| 754 // not last one | |
| 755 assert(new_top > hr->end(), "new_top should be above this region"); | |
| 756 hr->set_top(hr->end()); | |
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757 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, hr->end()); |
| 2361 | 758 } |
| 759 } | |
| 760 // If we have continues humongous regions (hr != NULL), then the | |
| 761 // end of the last one should match new_end and its top should | |
| 762 // match new_top. | |
| 763 assert(hr == NULL || | |
| 764 (hr->end() == new_end && hr->top() == new_top), "sanity"); | |
| 765 | |
| 766 assert(first_hr->used() == word_size * HeapWordSize, "invariant"); | |
| 767 _summary_bytes_used += first_hr->used(); | |
| 768 _humongous_set.add(first_hr); | |
| 769 | |
| 770 return new_obj; | |
| 771 } | |
| 772 | |
| 342 | 773 // If could fit into free regions w/o expansion, try. |
| 774 // Otherwise, if can expand, do so. | |
| 775 // Otherwise, if using ex regions might help, try with ex given back. | |
| 1973 | 776 HeapWord* G1CollectedHeap::humongous_obj_allocate(size_t word_size) { |
| 2152 | 777 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
| 778 | |
| 779 verify_region_sets_optional(); | |
| 342 | 780 |
| 781 size_t num_regions = | |
| 1973 | 782 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; |
| 342 | 783 size_t x_size = expansion_regions(); |
| 3766 | 784 size_t fs = _hrs.free_suffix(); |
| 785 size_t first = humongous_obj_allocate_find_first(num_regions, word_size); | |
| 786 if (first == G1_NULL_HRS_INDEX) { | |
| 2152 | 787 // The only thing we can do now is attempt expansion. |
| 342 | 788 if (fs + x_size >= num_regions) { |
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789 // If the number of regions we're trying to allocate for this |
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790 // object is at most the number of regions in the free suffix, |
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791 // then the call to humongous_obj_allocate_find_first() above |
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792 // should have succeeded and we wouldn't be here. |
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793 // |
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794 // We should only be trying to expand when the free suffix is |
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795 // not sufficient for the object _and_ we have some expansion |
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796 // room available. |
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797 assert(num_regions > fs, "earlier allocation should have succeeded"); |
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798 |
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799 ergo_verbose1(ErgoHeapSizing, |
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800 "attempt heap expansion", |
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801 ergo_format_reason("humongous allocation request failed") |
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802 ergo_format_byte("allocation request"), |
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803 word_size * HeapWordSize); |
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804 if (expand((num_regions - fs) * HeapRegion::GrainBytes)) { |
| 3766 | 805 // Even though the heap was expanded, it might not have |
| 806 // reached the desired size. So, we cannot assume that the | |
| 807 // allocation will succeed. | |
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808 first = humongous_obj_allocate_find_first(num_regions, word_size); |
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809 } |
| 2152 | 810 } |
| 811 } | |
| 812 | |
| 2361 | 813 HeapWord* result = NULL; |
| 3766 | 814 if (first != G1_NULL_HRS_INDEX) { |
| 2361 | 815 result = |
| 816 humongous_obj_allocate_initialize_regions(first, num_regions, word_size); | |
| 817 assert(result != NULL, "it should always return a valid result"); | |
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818 |
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819 // A successful humongous object allocation changes the used space |
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820 // information of the old generation so we need to recalculate the |
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821 // sizes and update the jstat counters here. |
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822 g1mm()->update_sizes(); |
| 2152 | 823 } |
| 824 | |
| 825 verify_region_sets_optional(); | |
| 2361 | 826 |
| 827 return result; | |
| 342 | 828 } |
| 829 | |
| 1973 | 830 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
| 831 assert_heap_not_locked_and_not_at_safepoint(); | |
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832 assert(!isHumongous(word_size), "we do not allow humongous TLABs"); |
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833 |
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834 unsigned int dummy_gc_count_before; |
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835 return attempt_allocation(word_size, &dummy_gc_count_before); |
| 342 | 836 } |
| 837 | |
| 838 HeapWord* | |
| 839 G1CollectedHeap::mem_allocate(size_t word_size, | |
| 1973 | 840 bool* gc_overhead_limit_was_exceeded) { |
| 841 assert_heap_not_locked_and_not_at_safepoint(); | |
| 342 | 842 |
|
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843 // Loop until the allocation is satisified, or unsatisfied after GC. |
| 1973 | 844 for (int try_count = 1; /* we'll return */; try_count += 1) { |
| 845 unsigned int gc_count_before; | |
|
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846 |
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|
847 HeapWord* result = NULL; |
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848 if (!isHumongous(word_size)) { |
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849 result = attempt_allocation(word_size, &gc_count_before); |
|
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850 } else { |
|
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851 result = attempt_allocation_humongous(word_size, &gc_count_before); |
|
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|
852 } |
|
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|
853 if (result != NULL) { |
|
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|
854 return result; |
| 342 | 855 } |
| 856 | |
| 857 // Create the garbage collection operation... | |
| 1973 | 858 VM_G1CollectForAllocation op(gc_count_before, word_size); |
| 342 | 859 // ...and get the VM thread to execute it. |
| 860 VMThread::execute(&op); | |
| 1973 | 861 |
| 862 if (op.prologue_succeeded() && op.pause_succeeded()) { | |
| 863 // If the operation was successful we'll return the result even | |
| 864 // if it is NULL. If the allocation attempt failed immediately | |
| 865 // after a Full GC, it's unlikely we'll be able to allocate now. | |
| 866 HeapWord* result = op.result(); | |
| 867 if (result != NULL && !isHumongous(word_size)) { | |
| 868 // Allocations that take place on VM operations do not do any | |
| 869 // card dirtying and we have to do it here. We only have to do | |
| 870 // this for non-humongous allocations, though. | |
| 871 dirty_young_block(result, word_size); | |
| 872 } | |
| 342 | 873 return result; |
| 1973 | 874 } else { |
| 875 assert(op.result() == NULL, | |
| 876 "the result should be NULL if the VM op did not succeed"); | |
| 342 | 877 } |
| 878 | |
| 879 // Give a warning if we seem to be looping forever. | |
| 880 if ((QueuedAllocationWarningCount > 0) && | |
| 881 (try_count % QueuedAllocationWarningCount == 0)) { | |
| 1973 | 882 warning("G1CollectedHeap::mem_allocate retries %d times", try_count); |
| 342 | 883 } |
| 884 } | |
| 1973 | 885 |
| 886 ShouldNotReachHere(); | |
|
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887 return NULL; |
| 342 | 888 } |
| 889 | |
|
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890 HeapWord* G1CollectedHeap::attempt_allocation_slow(size_t word_size, |
|
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891 unsigned int *gc_count_before_ret) { |
|
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892 // Make sure you read the note in attempt_allocation_humongous(). |
|
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|
893 |
|
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|
894 assert_heap_not_locked_and_not_at_safepoint(); |
|
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|
895 assert(!isHumongous(word_size), "attempt_allocation_slow() should not " |
|
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|
896 "be called for humongous allocation requests"); |
|
abdfc822206f
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|
897 |
|
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|
898 // We should only get here after the first-level allocation attempt |
|
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|
899 // (attempt_allocation()) failed to allocate. |
|
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|
900 |
|
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|
901 // We will loop until a) we manage to successfully perform the |
|
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|
902 // allocation or b) we successfully schedule a collection which |
|
abdfc822206f
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|
903 // fails to perform the allocation. b) is the only case when we'll |
|
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|
904 // return NULL. |
|
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|
905 HeapWord* result = NULL; |
|
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|
906 for (int try_count = 1; /* we'll return */; try_count += 1) { |
|
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|
907 bool should_try_gc; |
|
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|
908 unsigned int gc_count_before; |
|
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|
909 |
|
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|
910 { |
|
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|
911 MutexLockerEx x(Heap_lock); |
|
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|
912 |
|
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|
913 result = _mutator_alloc_region.attempt_allocation_locked(word_size, |
|
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|
914 false /* bot_updates */); |
|
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|
915 if (result != NULL) { |
|
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|
916 return result; |
|
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|
917 } |
|
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|
918 |
|
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|
919 // If we reach here, attempt_allocation_locked() above failed to |
|
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|
920 // allocate a new region. So the mutator alloc region should be NULL. |
|
abdfc822206f
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|
921 assert(_mutator_alloc_region.get() == NULL, "only way to get here"); |
|
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|
922 |
|
abdfc822206f
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|
923 if (GC_locker::is_active_and_needs_gc()) { |
|
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|
924 if (g1_policy()->can_expand_young_list()) { |
|
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3886
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|
925 // No need for an ergo verbose message here, |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3886
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|
926 // can_expand_young_list() does this when it returns true. |
|
2433
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|
927 result = _mutator_alloc_region.attempt_allocation_force(word_size, |
|
abdfc822206f
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|
928 false /* bot_updates */); |
|
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|
929 if (result != NULL) { |
|
abdfc822206f
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|
930 return result; |
|
abdfc822206f
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parents:
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|
931 } |
|
abdfc822206f
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|
932 } |
|
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|
933 should_try_gc = false; |
|
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|
934 } else { |
|
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|
935 // Read the GC count while still holding the Heap_lock. |
|
abdfc822206f
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|
936 gc_count_before = SharedHeap::heap()->total_collections(); |
|
abdfc822206f
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|
937 should_try_gc = true; |
|
abdfc822206f
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|
938 } |
|
abdfc822206f
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|
939 } |
|
abdfc822206f
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|
940 |
|
abdfc822206f
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|
941 if (should_try_gc) { |
|
abdfc822206f
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|
942 bool succeeded; |
|
abdfc822206f
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|
943 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
|
abdfc822206f
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|
944 if (result != NULL) { |
|
abdfc822206f
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|
945 assert(succeeded, "only way to get back a non-NULL result"); |
|
abdfc822206f
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|
946 return result; |
|
abdfc822206f
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tonyp
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diff
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|
947 } |
|
abdfc822206f
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diff
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|
948 |
|
abdfc822206f
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diff
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|
949 if (succeeded) { |
|
abdfc822206f
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|
950 // If we get here we successfully scheduled a collection which |
|
abdfc822206f
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|
951 // failed to allocate. No point in trying to allocate |
|
abdfc822206f
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|
952 // further. We'll just return NULL. |
|
abdfc822206f
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|
953 MutexLockerEx x(Heap_lock); |
|
abdfc822206f
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|
954 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
|
abdfc822206f
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|
955 return NULL; |
|
abdfc822206f
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parents:
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diff
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|
956 } |
|
abdfc822206f
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|
957 } else { |
|
abdfc822206f
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|
958 GC_locker::stall_until_clear(); |
|
abdfc822206f
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|
959 } |
|
abdfc822206f
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|
960 |
|
abdfc822206f
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diff
changeset
|
961 // We can reach here if we were unsuccessul in scheduling a |
|
abdfc822206f
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|
962 // collection (because another thread beat us to it) or if we were |
|
abdfc822206f
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|
963 // stalled due to the GC locker. In either can we should retry the |
|
abdfc822206f
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|
964 // allocation attempt in case another thread successfully |
|
abdfc822206f
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|
965 // performed a collection and reclaimed enough space. We do the |
|
abdfc822206f
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|
966 // first attempt (without holding the Heap_lock) here and the |
|
abdfc822206f
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|
967 // follow-on attempt will be at the start of the next loop |
|
abdfc822206f
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|
968 // iteration (after taking the Heap_lock). |
|
abdfc822206f
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|
969 result = _mutator_alloc_region.attempt_allocation(word_size, |
|
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diff
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|
970 false /* bot_updates */); |
|
abdfc822206f
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diff
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|
971 if (result != NULL ){ |
|
abdfc822206f
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parents:
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diff
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|
972 return result; |
|
abdfc822206f
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tonyp
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diff
changeset
|
973 } |
|
abdfc822206f
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|
974 |
|
abdfc822206f
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diff
changeset
|
975 // Give a warning if we seem to be looping forever. |
|
abdfc822206f
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|
976 if ((QueuedAllocationWarningCount > 0) && |
|
abdfc822206f
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|
977 (try_count % QueuedAllocationWarningCount == 0)) { |
|
abdfc822206f
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|
978 warning("G1CollectedHeap::attempt_allocation_slow() " |
|
abdfc822206f
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|
979 "retries %d times", try_count); |
|
abdfc822206f
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2432
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|
980 } |
|
abdfc822206f
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tonyp
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2432
diff
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|
981 } |
|
abdfc822206f
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tonyp
parents:
2432
diff
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|
982 |
|
abdfc822206f
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tonyp
parents:
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diff
changeset
|
983 ShouldNotReachHere(); |
|
abdfc822206f
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tonyp
parents:
2432
diff
changeset
|
984 return NULL; |
|
abdfc822206f
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tonyp
parents:
2432
diff
changeset
|
985 } |
|
abdfc822206f
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2432
diff
changeset
|
986 |
|
abdfc822206f
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2432
diff
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|
987 HeapWord* G1CollectedHeap::attempt_allocation_humongous(size_t word_size, |
|
abdfc822206f
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|
988 unsigned int * gc_count_before_ret) { |
|
abdfc822206f
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2432
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|
989 // The structure of this method has a lot of similarities to |
|
abdfc822206f
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2432
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|
990 // attempt_allocation_slow(). The reason these two were not merged |
|
abdfc822206f
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|
991 // into a single one is that such a method would require several "if |
|
abdfc822206f
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|
992 // allocation is not humongous do this, otherwise do that" |
|
abdfc822206f
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|
993 // conditional paths which would obscure its flow. In fact, an early |
|
abdfc822206f
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|
994 // version of this code did use a unified method which was harder to |
|
abdfc822206f
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changeset
|
995 // follow and, as a result, it had subtle bugs that were hard to |
|
abdfc822206f
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2432
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|
996 // track down. So keeping these two methods separate allows each to |
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997 // be more readable. It will be good to keep these two in sync as |
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998 // much as possible. |
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999 |
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1000 assert_heap_not_locked_and_not_at_safepoint(); |
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1001 assert(isHumongous(word_size), "attempt_allocation_humongous() " |
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1002 "should only be called for humongous allocations"); |
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1003 |
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1004 // We will loop until a) we manage to successfully perform the |
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1005 // allocation or b) we successfully schedule a collection which |
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1006 // fails to perform the allocation. b) is the only case when we'll |
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1007 // return NULL. |
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1008 HeapWord* result = NULL; |
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1009 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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1010 bool should_try_gc; |
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1011 unsigned int gc_count_before; |
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1012 |
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1013 { |
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1014 MutexLockerEx x(Heap_lock); |
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1015 |
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1016 // Given that humongous objects are not allocated in young |
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1017 // regions, we'll first try to do the allocation without doing a |
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1018 // collection hoping that there's enough space in the heap. |
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1019 result = humongous_obj_allocate(word_size); |
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1020 if (result != NULL) { |
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1021 return result; |
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1022 } |
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1023 |
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1024 if (GC_locker::is_active_and_needs_gc()) { |
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1025 should_try_gc = false; |
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1026 } else { |
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1027 // Read the GC count while still holding the Heap_lock. |
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1028 gc_count_before = SharedHeap::heap()->total_collections(); |
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1029 should_try_gc = true; |
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1030 } |
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1031 } |
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1032 |
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1033 if (should_try_gc) { |
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1034 // If we failed to allocate the humongous object, we should try to |
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1035 // do a collection pause (if we're allowed) in case it reclaims |
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1036 // enough space for the allocation to succeed after the pause. |
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1037 |
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1038 bool succeeded; |
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1039 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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1040 if (result != NULL) { |
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1041 assert(succeeded, "only way to get back a non-NULL result"); |
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1042 return result; |
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1043 } |
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1044 |
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1045 if (succeeded) { |
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1046 // If we get here we successfully scheduled a collection which |
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1047 // failed to allocate. No point in trying to allocate |
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1048 // further. We'll just return NULL. |
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1049 MutexLockerEx x(Heap_lock); |
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1050 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
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1051 return NULL; |
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1052 } |
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1053 } else { |
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1054 GC_locker::stall_until_clear(); |
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1055 } |
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1056 |
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1057 // We can reach here if we were unsuccessul in scheduling a |
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1058 // collection (because another thread beat us to it) or if we were |
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1059 // stalled due to the GC locker. In either can we should retry the |
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1060 // allocation attempt in case another thread successfully |
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1061 // performed a collection and reclaimed enough space. Give a |
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1062 // warning if we seem to be looping forever. |
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1063 |
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1064 if ((QueuedAllocationWarningCount > 0) && |
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1065 (try_count % QueuedAllocationWarningCount == 0)) { |
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1066 warning("G1CollectedHeap::attempt_allocation_humongous() " |
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1067 "retries %d times", try_count); |
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1068 } |
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1069 } |
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1070 |
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1071 ShouldNotReachHere(); |
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1072 return NULL; |
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1073 } |
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1074 |
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1075 HeapWord* G1CollectedHeap::attempt_allocation_at_safepoint(size_t word_size, |
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1076 bool expect_null_mutator_alloc_region) { |
| 2152 | 1077 assert_at_safepoint(true /* should_be_vm_thread */); |
|
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1078 assert(_mutator_alloc_region.get() == NULL || |
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1079 !expect_null_mutator_alloc_region, |
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1080 "the current alloc region was unexpectedly found to be non-NULL"); |
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1081 |
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1082 if (!isHumongous(word_size)) { |
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1083 return _mutator_alloc_region.attempt_allocation_locked(word_size, |
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1084 false /* bot_updates */); |
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1085 } else { |
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1086 return humongous_obj_allocate(word_size); |
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1087 } |
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1088 |
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1089 ShouldNotReachHere(); |
| 342 | 1090 } |
| 1091 | |
| 1092 class PostMCRemSetClearClosure: public HeapRegionClosure { | |
| 1093 ModRefBarrierSet* _mr_bs; | |
| 1094 public: | |
| 1095 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 1096 bool doHeapRegion(HeapRegion* r) { | |
| 1097 r->reset_gc_time_stamp(); | |
| 1098 if (r->continuesHumongous()) | |
| 1099 return false; | |
| 1100 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 1101 if (hrrs != NULL) hrrs->clear(); | |
| 1102 // You might think here that we could clear just the cards | |
| 1103 // corresponding to the used region. But no: if we leave a dirty card | |
| 1104 // in a region we might allocate into, then it would prevent that card | |
| 1105 // from being enqueued, and cause it to be missed. | |
| 1106 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
| 1107 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
| 1108 return false; | |
| 1109 } | |
| 1110 }; | |
| 1111 | |
| 1112 | |
| 1113 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
| 1114 ModRefBarrierSet* _mr_bs; | |
| 1115 public: | |
| 1116 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 1117 bool doHeapRegion(HeapRegion* r) { | |
| 1118 if (r->continuesHumongous()) return false; | |
| 1119 if (r->used_region().word_size() != 0) { | |
| 1120 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
| 1121 } | |
| 1122 return false; | |
| 1123 } | |
| 1124 }; | |
| 1125 | |
|
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1126 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
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1127 G1CollectedHeap* _g1h; |
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1128 UpdateRSOopClosure _cl; |
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1129 int _worker_i; |
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1130 public: |
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1131 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
| 1861 | 1132 _cl(g1->g1_rem_set(), worker_i), |
|
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1133 _worker_i(worker_i), |
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1134 _g1h(g1) |
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1135 { } |
|
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1136 |
|
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1137 bool doHeapRegion(HeapRegion* r) { |
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1138 if (!r->continuesHumongous()) { |
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1139 _cl.set_from(r); |
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1140 r->oop_iterate(&_cl); |
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1141 } |
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1142 return false; |
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1143 } |
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1144 }; |
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1145 |
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1146 class ParRebuildRSTask: public AbstractGangTask { |
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1147 G1CollectedHeap* _g1; |
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1148 public: |
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1149 ParRebuildRSTask(G1CollectedHeap* g1) |
|
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1150 : AbstractGangTask("ParRebuildRSTask"), |
|
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1151 _g1(g1) |
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1152 { } |
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1153 |
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1154 void work(int i) { |
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1155 RebuildRSOutOfRegionClosure rebuild_rs(_g1, i); |
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1156 _g1->heap_region_par_iterate_chunked(&rebuild_rs, i, |
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1157 HeapRegion::RebuildRSClaimValue); |
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1158 } |
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1159 }; |
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1160 |
|
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1161 class PostCompactionPrinterClosure: public HeapRegionClosure { |
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1162 private: |
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1163 G1HRPrinter* _hr_printer; |
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1164 public: |
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1165 bool doHeapRegion(HeapRegion* hr) { |
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1166 assert(!hr->is_young(), "not expecting to find young regions"); |
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1167 // We only generate output for non-empty regions. |
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1168 if (!hr->is_empty()) { |
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1169 if (!hr->isHumongous()) { |
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1170 _hr_printer->post_compaction(hr, G1HRPrinter::Old); |
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1171 } else if (hr->startsHumongous()) { |
|
3986
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1172 if (hr->capacity() == HeapRegion::GrainBytes) { |
|
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1173 // single humongous region |
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1174 _hr_printer->post_compaction(hr, G1HRPrinter::SingleHumongous); |
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1175 } else { |
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1176 _hr_printer->post_compaction(hr, G1HRPrinter::StartsHumongous); |
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1177 } |
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1178 } else { |
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1179 assert(hr->continuesHumongous(), "only way to get here"); |
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1180 _hr_printer->post_compaction(hr, G1HRPrinter::ContinuesHumongous); |
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1181 } |
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1182 } |
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1183 return false; |
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1184 } |
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1185 |
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1186 PostCompactionPrinterClosure(G1HRPrinter* hr_printer) |
|
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1187 : _hr_printer(hr_printer) { } |
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1188 }; |
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1189 |
| 1973 | 1190 bool G1CollectedHeap::do_collection(bool explicit_gc, |
|
1656
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1191 bool clear_all_soft_refs, |
| 342 | 1192 size_t word_size) { |
| 2152 | 1193 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1194 | |
|
1359
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1195 if (GC_locker::check_active_before_gc()) { |
| 1973 | 1196 return false; |
|
1359
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1197 } |
|
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1198 |
|
2125
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|
1199 SvcGCMarker sgcm(SvcGCMarker::FULL); |
| 342 | 1200 ResourceMark rm; |
| 1201 | |
|
838
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|
1202 if (PrintHeapAtGC) { |
|
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1203 Universe::print_heap_before_gc(); |
|
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1204 } |
|
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1205 |
| 2152 | 1206 verify_region_sets_optional(); |
| 342 | 1207 |
|
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1208 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
|
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|
1209 collector_policy()->should_clear_all_soft_refs(); |
|
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1210 |
|
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|
1211 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
|
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1212 |
| 342 | 1213 { |
| 1214 IsGCActiveMark x; | |
| 1215 | |
| 1216 // Timing | |
|
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|
1217 bool system_gc = (gc_cause() == GCCause::_java_lang_system_gc); |
|
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|
1218 assert(!system_gc || explicit_gc, "invariant"); |
| 342 | 1219 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
| 1220 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
|
1656
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|
1221 TraceTime t(system_gc ? "Full GC (System.gc())" : "Full GC", |
|
1387
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|
1222 PrintGC, true, gclog_or_tty); |
| 342 | 1223 |
|
3289
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diff
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|
1224 TraceCollectorStats tcs(g1mm()->full_collection_counters()); |
|
3356
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7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
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|
1225 TraceMemoryManagerStats tms(true /* fullGC */, gc_cause()); |
|
1089
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6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
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|
1226 |
| 342 | 1227 double start = os::elapsedTime(); |
| 1228 g1_policy()->record_full_collection_start(); | |
| 1229 | |
| 2152 | 1230 wait_while_free_regions_coming(); |
| 2361 | 1231 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 1232 |
| 342 | 1233 gc_prologue(true); |
|
838
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|
1234 increment_total_collections(true /* full gc */); |
| 342 | 1235 |
| 1236 size_t g1h_prev_used = used(); | |
| 1237 assert(used() == recalculate_used(), "Should be equal"); | |
| 1238 | |
| 1239 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
| 1240 HandleMark hm; // Discard invalid handles created during verification | |
|
2433
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|
1241 gclog_or_tty->print(" VerifyBeforeGC:"); |
| 342 | 1242 prepare_for_verify(); |
|
3772
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|
1243 Universe::verify(/* allow dirty */ true, |
|
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|
1244 /* silent */ false, |
|
6747fd0512e0
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|
1245 /* option */ VerifyOption_G1UsePrevMarking); |
|
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|
1246 |
| 342 | 1247 } |
|
3869
7f776886a215
6810861: G1: support -XX:+{PrintClassHistogram,HeapDump}{Before,After}FullGC
ysr
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diff
changeset
|
1248 pre_full_gc_dump(); |
| 342 | 1249 |
| 1250 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 1251 | |
|
3979
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|
1252 // Disable discovery and empty the discovered lists |
|
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|
1253 // for the CM ref processor. |
|
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|
1254 ref_processor_cm()->disable_discovery(); |
|
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|
1255 ref_processor_cm()->abandon_partial_discovery(); |
|
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|
1256 ref_processor_cm()->verify_no_references_recorded(); |
| 342 | 1257 |
| 1258 // Abandon current iterations of concurrent marking and concurrent | |
| 1259 // refinement, if any are in progress. | |
| 1260 concurrent_mark()->abort(); | |
| 1261 | |
| 1262 // Make sure we'll choose a new allocation region afterwards. | |
|
2433
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|
1263 release_mutator_alloc_region(); |
| 636 | 1264 abandon_gc_alloc_regions(); |
| 1861 | 1265 g1_rem_set()->cleanupHRRS(); |
| 342 | 1266 tear_down_region_lists(); |
|
1394
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|
1267 |
|
3778
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|
1268 // We should call this after we retire any currently active alloc |
|
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|
1269 // regions so that all the ALLOC / RETIRE events are generated |
|
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|
1270 // before the start GC event. |
|
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|
1271 _hr_printer.start_gc(true /* full */, (size_t) total_collections()); |
|
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|
1272 |
|
1394
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|
1273 // We may have added regions to the current incremental collection |
|
1316cec51b4d
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|
1274 // set between the last GC or pause and now. We need to clear the |
|
1316cec51b4d
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|
1275 // incremental collection set and then start rebuilding it afresh |
|
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|
1276 // after this full GC. |
|
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|
1277 abandon_collection_set(g1_policy()->inc_cset_head()); |
|
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|
1278 g1_policy()->clear_incremental_cset(); |
|
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|
1279 g1_policy()->stop_incremental_cset_building(); |
|
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diff
changeset
|
1280 |
|
3867
ff53346271fe
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brutisso
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3830
diff
changeset
|
1281 empty_young_list(); |
|
ff53346271fe
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diff
changeset
|
1282 g1_policy()->set_full_young_gcs(true); |
| 342 | 1283 |
|
3979
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|
1284 // See the comments in g1CollectedHeap.hpp and |
|
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diff
changeset
|
1285 // G1CollectedHeap::ref_processing_init() about |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
1286 // how reference processing currently works in G1. |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
1287 |
|
3979
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changeset
|
1288 // Temporarily make discovery by the STW ref processor single threaded (non-MT). |
|
4dfb2df418f2
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changeset
|
1289 ReferenceProcessorMTDiscoveryMutator stw_rp_disc_ser(ref_processor_stw(), false); |
|
4dfb2df418f2
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changeset
|
1290 |
|
4dfb2df418f2
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changeset
|
1291 // Temporarily clear the STW ref processor's _is_alive_non_header field. |
|
4dfb2df418f2
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changeset
|
1292 ReferenceProcessorIsAliveMutator stw_rp_is_alive_null(ref_processor_stw(), NULL); |
|
4dfb2df418f2
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diff
changeset
|
1293 |
|
4dfb2df418f2
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diff
changeset
|
1294 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
|
4dfb2df418f2
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changeset
|
1295 ref_processor_stw()->setup_policy(do_clear_all_soft_refs); |
|
4dfb2df418f2
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|
1296 |
| 342 | 1297 // Do collection work |
| 1298 { | |
| 1299 HandleMark hm; // Discard invalid handles created during gc | |
|
3979
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changeset
|
1300 G1MarkSweep::invoke_at_safepoint(ref_processor_stw(), do_clear_all_soft_refs); |
| 342 | 1301 } |
|
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1302 |
| 2152 | 1303 assert(free_regions() == 0, "we should not have added any free regions"); |
| 342 | 1304 rebuild_region_lists(); |
| 1305 | |
| 1306 _summary_bytes_used = recalculate_used(); | |
| 1307 | |
|
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1308 // Enqueue any discovered reference objects that have |
|
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1309 // not been removed from the discovered lists. |
|
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|
1310 ref_processor_stw()->enqueue_discovered_references(); |
| 342 | 1311 |
| 1312 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 1313 | |
|
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1314 MemoryService::track_memory_usage(); |
|
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1315 |
| 342 | 1316 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
| 1317 HandleMark hm; // Discard invalid handles created during verification | |
| 1318 gclog_or_tty->print(" VerifyAfterGC:"); | |
|
637
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|
1319 prepare_for_verify(); |
|
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1320 Universe::verify(/* allow dirty */ false, |
|
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1321 /* silent */ false, |
|
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1322 /* option */ VerifyOption_G1UsePrevMarking); |
|
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1323 |
| 342 | 1324 } |
|
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1325 |
|
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1326 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
|
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1327 ref_processor_stw()->verify_no_references_recorded(); |
|
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1328 |
|
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1329 // Note: since we've just done a full GC, concurrent |
|
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1330 // marking is no longer active. Therefore we need not |
|
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1331 // re-enable reference discovery for the CM ref processor. |
|
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1332 // That will be done at the start of the next marking cycle. |
|
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|
1333 assert(!ref_processor_cm()->discovery_enabled(), "Postcondition"); |
|
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|
1334 ref_processor_cm()->verify_no_references_recorded(); |
| 342 | 1335 |
| 1336 reset_gc_time_stamp(); | |
| 1337 // Since everything potentially moved, we will clear all remembered | |
|
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1338 // sets, and clear all cards. Later we will rebuild remebered |
|
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1339 // sets. We will also reset the GC time stamps of the regions. |
| 342 | 1340 PostMCRemSetClearClosure rs_clear(mr_bs()); |
| 1341 heap_region_iterate(&rs_clear); | |
| 1342 | |
| 1343 // Resize the heap if necessary. | |
|
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1344 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
| 342 | 1345 |
|
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1346 if (_hr_printer.is_active()) { |
|
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1347 // We should do this after we potentially resize the heap so |
|
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1348 // that all the COMMIT / UNCOMMIT events are generated before |
|
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1349 // the end GC event. |
|
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1350 |
|
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|
1351 PostCompactionPrinterClosure cl(hr_printer()); |
|
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1352 heap_region_iterate(&cl); |
|
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1353 |
|
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|
1354 _hr_printer.end_gc(true /* full */, (size_t) total_collections()); |
|
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1355 } |
|
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|
1356 |
| 342 | 1357 if (_cg1r->use_cache()) { |
| 1358 _cg1r->clear_and_record_card_counts(); | |
| 1359 _cg1r->clear_hot_cache(); | |
| 1360 } | |
| 1361 | |
|
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1362 // Rebuild remembered sets of all regions. |
|
1833
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1363 |
|
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|
1364 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
626
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1365 ParRebuildRSTask rebuild_rs_task(this); |
|
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1366 assert(check_heap_region_claim_values( |
|
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1367 HeapRegion::InitialClaimValue), "sanity check"); |
|
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|
1368 set_par_threads(workers()->total_workers()); |
|
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|
1369 workers()->run_task(&rebuild_rs_task); |
|
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1370 set_par_threads(0); |
|
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|
1371 assert(check_heap_region_claim_values( |
|
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1372 HeapRegion::RebuildRSClaimValue), "sanity check"); |
|
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1373 reset_heap_region_claim_values(); |
|
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1374 } else { |
|
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|
1375 RebuildRSOutOfRegionClosure rebuild_rs(this); |
|
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1376 heap_region_iterate(&rebuild_rs); |
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1377 } |
|
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|
1378 |
| 342 | 1379 if (PrintGC) { |
| 1380 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
| 1381 } | |
| 1382 | |
| 1383 if (true) { // FIXME | |
| 1384 // Ask the permanent generation to adjust size for full collections | |
| 1385 perm()->compute_new_size(); | |
| 1386 } | |
| 1387 | |
|
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1388 // Start a new incremental collection set for the next pause |
|
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|
1389 assert(g1_policy()->collection_set() == NULL, "must be"); |
|
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|
1390 g1_policy()->start_incremental_cset_building(); |
|
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1391 |
|
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|
1392 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
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1393 // regions to the incremental collection set for the next |
|
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1394 // evacuation pause. |
|
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|
1395 clear_cset_fast_test(); |
|
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|
1396 |
|
2433
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|
1397 init_mutator_alloc_region(); |
|
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|
1398 |
| 342 | 1399 double end = os::elapsedTime(); |
| 1400 g1_policy()->record_full_collection_end(); | |
| 1401 | |
|
546
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|
1402 #ifdef TRACESPINNING |
|
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|
1403 ParallelTaskTerminator::print_termination_counts(); |
|
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|
1404 #endif |
|
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|
1405 |
| 342 | 1406 gc_epilogue(true); |
| 1407 | |
| 794 | 1408 // Discard all rset updates |
| 1409 JavaThread::dirty_card_queue_set().abandon_logs(); | |
|
616
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|
1410 assert(!G1DeferredRSUpdate |
|
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1411 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
| 342 | 1412 } |
| 1413 | |
|
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|
1414 _young_list->reset_sampled_info(); |
|
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1415 // At this point there should be no regions in the |
|
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|
1416 // entire heap tagged as young. |
|
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|
1417 assert( check_young_list_empty(true /* check_heap */), |
|
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|
1418 "young list should be empty at this point"); |
|
838
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1419 |
|
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|
1420 // Update the number of full collections that have been completed. |
|
2030
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|
1421 increment_full_collections_completed(false /* concurrent */); |
|
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|
1422 |
| 3766 | 1423 _hrs.verify_optional(); |
| 2152 | 1424 verify_region_sets_optional(); |
| 1425 | |
|
838
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|
1426 if (PrintHeapAtGC) { |
|
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|
1427 Universe::print_heap_after_gc(); |
|
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|
1428 } |
|
3980
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|
1429 g1mm()->update_sizes(); |
|
3869
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|
1430 post_full_gc_dump(); |
| 1973 | 1431 |
| 1432 return true; | |
| 342 | 1433 } |
| 1434 | |
| 1435 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
| 1973 | 1436 // do_collection() will return whether it succeeded in performing |
| 1437 // the GC. Currently, there is no facility on the | |
| 1438 // do_full_collection() API to notify the caller than the collection | |
| 1439 // did not succeed (e.g., because it was locked out by the GC | |
| 1440 // locker). So, right now, we'll ignore the return value. | |
| 1441 bool dummy = do_collection(true, /* explicit_gc */ | |
| 1442 clear_all_soft_refs, | |
| 1443 0 /* word_size */); | |
| 342 | 1444 } |
| 1445 | |
| 1446 // This code is mostly copied from TenuredGeneration. | |
| 1447 void | |
| 1448 G1CollectedHeap:: | |
| 1449 resize_if_necessary_after_full_collection(size_t word_size) { | |
| 1450 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
| 1451 | |
| 1452 // Include the current allocation, if any, and bytes that will be | |
| 1453 // pre-allocated to support collections, as "used". | |
| 1454 const size_t used_after_gc = used(); | |
| 1455 const size_t capacity_after_gc = capacity(); | |
| 1456 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
| 1457 | |
|
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1458 // This is enforced in arguments.cpp. |
|
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|
1459 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
|
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|
1460 "otherwise the code below doesn't make sense"); |
|
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|
1461 |
| 342 | 1462 // We don't have floating point command-line arguments |
|
1717
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|
1463 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
| 342 | 1464 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
|
1717
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|
1465 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
| 342 | 1466 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
| 1467 | |
|
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|
1468 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
|
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|
1469 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
|
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|
1470 |
|
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|
1471 // We have to be careful here as these two calculations can overflow |
|
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|
1472 // 32-bit size_t's. |
|
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|
1473 double used_after_gc_d = (double) used_after_gc; |
|
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|
1474 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
|
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|
1475 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
|
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|
1476 |
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1477 // Let's make sure that they are both under the max heap size, which |
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1478 // by default will make them fit into a size_t. |
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1479 double desired_capacity_upper_bound = (double) max_heap_size; |
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1480 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
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1481 desired_capacity_upper_bound); |
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1482 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
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1483 desired_capacity_upper_bound); |
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1484 |
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1485 // We can now safely turn them into size_t's. |
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1486 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
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1487 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
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1488 |
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1489 // This assert only makes sense here, before we adjust them |
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1490 // with respect to the min and max heap size. |
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1491 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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1492 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
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1493 "maximum_desired_capacity = "SIZE_FORMAT, |
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1494 minimum_desired_capacity, maximum_desired_capacity)); |
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1495 |
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1496 // Should not be greater than the heap max size. No need to adjust |
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1497 // it with respect to the heap min size as it's a lower bound (i.e., |
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1498 // we'll try to make the capacity larger than it, not smaller). |
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1499 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
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1500 // Should not be less than the heap min size. No need to adjust it |
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1501 // with respect to the heap max size as it's an upper bound (i.e., |
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1502 // we'll try to make the capacity smaller than it, not greater). |
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1503 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
| 342 | 1504 |
|
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1505 if (capacity_after_gc < minimum_desired_capacity) { |
| 342 | 1506 // Don't expand unless it's significant |
| 1507 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
|
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1508 ergo_verbose4(ErgoHeapSizing, |
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1509 "attempt heap expansion", |
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1510 ergo_format_reason("capacity lower than " |
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1511 "min desired capacity after Full GC") |
|
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1512 ergo_format_byte("capacity") |
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1513 ergo_format_byte("occupancy") |
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1514 ergo_format_byte_perc("min desired capacity"), |
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1515 capacity_after_gc, used_after_gc, |
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1516 minimum_desired_capacity, (double) MinHeapFreeRatio); |
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1517 expand(expand_bytes); |
| 342 | 1518 |
| 1519 // No expansion, now see if we want to shrink | |
|
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1520 } else if (capacity_after_gc > maximum_desired_capacity) { |
| 342 | 1521 // Capacity too large, compute shrinking size |
| 1522 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
|
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1523 ergo_verbose4(ErgoHeapSizing, |
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1524 "attempt heap shrinking", |
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1525 ergo_format_reason("capacity higher than " |
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1526 "max desired capacity after Full GC") |
|
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1527 ergo_format_byte("capacity") |
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1528 ergo_format_byte("occupancy") |
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1529 ergo_format_byte_perc("max desired capacity"), |
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1530 capacity_after_gc, used_after_gc, |
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1531 maximum_desired_capacity, (double) MaxHeapFreeRatio); |
| 342 | 1532 shrink(shrink_bytes); |
| 1533 } | |
| 1534 } | |
| 1535 | |
| 1536 | |
| 1537 HeapWord* | |
| 1973 | 1538 G1CollectedHeap::satisfy_failed_allocation(size_t word_size, |
| 1539 bool* succeeded) { | |
| 2152 | 1540 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1973 | 1541 |
| 1542 *succeeded = true; | |
| 1543 // Let's attempt the allocation first. | |
|
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1544 HeapWord* result = |
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1545 attempt_allocation_at_safepoint(word_size, |
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1546 false /* expect_null_mutator_alloc_region */); |
| 1973 | 1547 if (result != NULL) { |
| 1548 assert(*succeeded, "sanity"); | |
| 1549 return result; | |
| 1550 } | |
| 342 | 1551 |
| 1552 // In a G1 heap, we're supposed to keep allocation from failing by | |
| 1553 // incremental pauses. Therefore, at least for now, we'll favor | |
| 1554 // expansion over collection. (This might change in the future if we can | |
| 1555 // do something smarter than full collection to satisfy a failed alloc.) | |
| 1556 result = expand_and_allocate(word_size); | |
| 1557 if (result != NULL) { | |
| 1973 | 1558 assert(*succeeded, "sanity"); |
| 342 | 1559 return result; |
| 1560 } | |
| 1561 | |
| 1973 | 1562 // Expansion didn't work, we'll try to do a Full GC. |
| 1563 bool gc_succeeded = do_collection(false, /* explicit_gc */ | |
| 1564 false, /* clear_all_soft_refs */ | |
| 1565 word_size); | |
| 1566 if (!gc_succeeded) { | |
| 1567 *succeeded = false; | |
| 1568 return NULL; | |
| 1569 } | |
| 1570 | |
| 1571 // Retry the allocation | |
| 1572 result = attempt_allocation_at_safepoint(word_size, | |
|
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1573 true /* expect_null_mutator_alloc_region */); |
| 342 | 1574 if (result != NULL) { |
| 1973 | 1575 assert(*succeeded, "sanity"); |
| 342 | 1576 return result; |
| 1577 } | |
| 1578 | |
| 1973 | 1579 // Then, try a Full GC that will collect all soft references. |
| 1580 gc_succeeded = do_collection(false, /* explicit_gc */ | |
| 1581 true, /* clear_all_soft_refs */ | |
| 1582 word_size); | |
| 1583 if (!gc_succeeded) { | |
| 1584 *succeeded = false; | |
| 1585 return NULL; | |
| 1586 } | |
| 1587 | |
| 1588 // Retry the allocation once more | |
| 1589 result = attempt_allocation_at_safepoint(word_size, | |
|
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1590 true /* expect_null_mutator_alloc_region */); |
| 342 | 1591 if (result != NULL) { |
| 1973 | 1592 assert(*succeeded, "sanity"); |
| 342 | 1593 return result; |
| 1594 } | |
| 1595 | |
|
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1596 assert(!collector_policy()->should_clear_all_soft_refs(), |
| 1973 | 1597 "Flag should have been handled and cleared prior to this point"); |
|
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1598 |
| 342 | 1599 // What else? We might try synchronous finalization later. If the total |
| 1600 // space available is large enough for the allocation, then a more | |
| 1601 // complete compaction phase than we've tried so far might be | |
| 1602 // appropriate. | |
| 1973 | 1603 assert(*succeeded, "sanity"); |
| 342 | 1604 return NULL; |
| 1605 } | |
| 1606 | |
| 1607 // Attempting to expand the heap sufficiently | |
| 1608 // to support an allocation of the given "word_size". If | |
| 1609 // successful, perform the allocation and return the address of the | |
| 1610 // allocated block, or else "NULL". | |
| 1611 | |
| 1612 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
| 2152 | 1613 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1614 | |
| 1615 verify_region_sets_optional(); | |
| 1973 | 1616 |
|
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1617 size_t expand_bytes = MAX2(word_size * HeapWordSize, MinHeapDeltaBytes); |
|
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1618 ergo_verbose1(ErgoHeapSizing, |
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1619 "attempt heap expansion", |
|
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1620 ergo_format_reason("allocation request failed") |
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1621 ergo_format_byte("allocation request"), |
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1622 word_size * HeapWordSize); |
|
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1623 if (expand(expand_bytes)) { |
| 3766 | 1624 _hrs.verify_optional(); |
|
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1625 verify_region_sets_optional(); |
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1626 return attempt_allocation_at_safepoint(word_size, |
|
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1627 false /* expect_null_mutator_alloc_region */); |
|
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1628 } |
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1629 return NULL; |
| 342 | 1630 } |
| 1631 | |
| 3766 | 1632 void G1CollectedHeap::update_committed_space(HeapWord* old_end, |
| 1633 HeapWord* new_end) { | |
| 1634 assert(old_end != new_end, "don't call this otherwise"); | |
| 1635 assert((HeapWord*) _g1_storage.high() == new_end, "invariant"); | |
| 1636 | |
| 1637 // Update the committed mem region. | |
| 1638 _g1_committed.set_end(new_end); | |
| 1639 // Tell the card table about the update. | |
| 1640 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
| 1641 // Tell the BOT about the update. | |
| 1642 _bot_shared->resize(_g1_committed.word_size()); | |
| 1643 } | |
| 1644 | |
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1645 bool G1CollectedHeap::expand(size_t expand_bytes) { |
| 342 | 1646 size_t old_mem_size = _g1_storage.committed_size(); |
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1647 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
| 342 | 1648 aligned_expand_bytes = align_size_up(aligned_expand_bytes, |
| 1649 HeapRegion::GrainBytes); | |
|
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1650 ergo_verbose2(ErgoHeapSizing, |
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1651 "expand the heap", |
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1652 ergo_format_byte("requested expansion amount") |
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1653 ergo_format_byte("attempted expansion amount"), |
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1654 expand_bytes, aligned_expand_bytes); |
|
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1655 |
| 3766 | 1656 // First commit the memory. |
| 1657 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
|
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1658 bool successful = _g1_storage.expand_by(aligned_expand_bytes); |
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1659 if (successful) { |
| 3766 | 1660 // Then propagate this update to the necessary data structures. |
| 1661 HeapWord* new_end = (HeapWord*) _g1_storage.high(); | |
| 1662 update_committed_space(old_end, new_end); | |
| 1663 | |
| 1664 FreeRegionList expansion_list("Local Expansion List"); | |
| 1665 MemRegion mr = _hrs.expand_by(old_end, new_end, &expansion_list); | |
| 1666 assert(mr.start() == old_end, "post-condition"); | |
| 1667 // mr might be a smaller region than what was requested if | |
| 1668 // expand_by() was unable to allocate the HeapRegion instances | |
| 1669 assert(mr.end() <= new_end, "post-condition"); | |
| 1670 | |
| 1671 size_t actual_expand_bytes = mr.byte_size(); | |
| 1672 assert(actual_expand_bytes <= aligned_expand_bytes, "post-condition"); | |
| 1673 assert(actual_expand_bytes == expansion_list.total_capacity_bytes(), | |
| 1674 "post-condition"); | |
| 1675 if (actual_expand_bytes < aligned_expand_bytes) { | |
| 1676 // We could not expand _hrs to the desired size. In this case we | |
| 1677 // need to shrink the committed space accordingly. | |
| 1678 assert(mr.end() < new_end, "invariant"); | |
| 1679 | |
| 1680 size_t diff_bytes = aligned_expand_bytes - actual_expand_bytes; | |
| 1681 // First uncommit the memory. | |
| 1682 _g1_storage.shrink_by(diff_bytes); | |
| 1683 // Then propagate this update to the necessary data structures. | |
| 1684 update_committed_space(new_end, mr.end()); | |
|
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1685 } |
| 3766 | 1686 _free_list.add_as_tail(&expansion_list); |
|
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1687 |
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1688 if (_hr_printer.is_active()) { |
|
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1689 HeapWord* curr = mr.start(); |
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1690 while (curr < mr.end()) { |
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1691 HeapWord* curr_end = curr + HeapRegion::GrainWords; |
|
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1692 _hr_printer.commit(curr, curr_end); |
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1693 curr = curr_end; |
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1694 } |
|
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1695 assert(curr == mr.end(), "post-condition"); |
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1696 } |
|
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1697 g1_policy()->record_new_heap_size(n_regions()); |
|
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1698 } else { |
|
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1699 ergo_verbose0(ErgoHeapSizing, |
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1700 "did not expand the heap", |
|
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1701 ergo_format_reason("heap expansion operation failed")); |
|
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1702 // The expansion of the virtual storage space was unsuccessful. |
|
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1703 // Let's see if it was because we ran out of swap. |
|
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1704 if (G1ExitOnExpansionFailure && |
|
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1705 _g1_storage.uncommitted_size() >= aligned_expand_bytes) { |
|
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1706 // We had head room... |
|
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1707 vm_exit_out_of_memory(aligned_expand_bytes, "G1 heap expansion"); |
| 342 | 1708 } |
| 1709 } | |
|
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1710 return successful; |
| 342 | 1711 } |
| 1712 | |
| 3766 | 1713 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) { |
| 342 | 1714 size_t old_mem_size = _g1_storage.committed_size(); |
| 1715 size_t aligned_shrink_bytes = | |
| 1716 ReservedSpace::page_align_size_down(shrink_bytes); | |
| 1717 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
| 1718 HeapRegion::GrainBytes); | |
| 1719 size_t num_regions_deleted = 0; | |
| 3766 | 1720 MemRegion mr = _hrs.shrink_by(aligned_shrink_bytes, &num_regions_deleted); |
| 1721 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
| 1722 assert(mr.end() == old_end, "post-condition"); | |
|
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1723 |
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1724 ergo_verbose3(ErgoHeapSizing, |
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1725 "shrink the heap", |
|
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1726 ergo_format_byte("requested shrinking amount") |
|
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1727 ergo_format_byte("aligned shrinking amount") |
|
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1728 ergo_format_byte("attempted shrinking amount"), |
|
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1729 shrink_bytes, aligned_shrink_bytes, mr.byte_size()); |
| 3766 | 1730 if (mr.byte_size() > 0) { |
|
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1731 if (_hr_printer.is_active()) { |
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1732 HeapWord* curr = mr.end(); |
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1733 while (curr > mr.start()) { |
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1734 HeapWord* curr_end = curr; |
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1735 curr -= HeapRegion::GrainWords; |
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1736 _hr_printer.uncommit(curr, curr_end); |
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1737 } |
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1738 assert(curr == mr.start(), "post-condition"); |
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1739 } |
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1740 |
| 342 | 1741 _g1_storage.shrink_by(mr.byte_size()); |
| 3766 | 1742 HeapWord* new_end = (HeapWord*) _g1_storage.high(); |
| 1743 assert(mr.start() == new_end, "post-condition"); | |
| 1744 | |
| 1745 _expansion_regions += num_regions_deleted; | |
| 1746 update_committed_space(old_end, new_end); | |
| 1747 HeapRegionRemSet::shrink_heap(n_regions()); | |
|
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1748 g1_policy()->record_new_heap_size(n_regions()); |
|
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1749 } else { |
|
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1750 ergo_verbose0(ErgoHeapSizing, |
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1751 "did not shrink the heap", |
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1752 ergo_format_reason("heap shrinking operation failed")); |
| 342 | 1753 } |
| 1754 } | |
| 1755 | |
| 1756 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
| 2152 | 1757 verify_region_sets_optional(); |
| 1758 | |
|
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1759 // We should only reach here at the end of a Full GC which means we |
|
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1760 // should not not be holding to any GC alloc regions. The method |
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1761 // below will make sure of that and do any remaining clean up. |
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1762 abandon_gc_alloc_regions(); |
|
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1763 |
| 2152 | 1764 // Instead of tearing down / rebuilding the free lists here, we |
| 1765 // could instead use the remove_all_pending() method on free_list to | |
| 1766 // remove only the ones that we need to remove. | |
| 342 | 1767 tear_down_region_lists(); // We will rebuild them in a moment. |
| 1768 shrink_helper(shrink_bytes); | |
| 1769 rebuild_region_lists(); | |
| 2152 | 1770 |
| 3766 | 1771 _hrs.verify_optional(); |
| 2152 | 1772 verify_region_sets_optional(); |
| 342 | 1773 } |
| 1774 | |
| 1775 // Public methods. | |
| 1776 | |
| 1777 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 1778 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 1779 #endif // _MSC_VER | |
| 1780 | |
| 1781 | |
| 1782 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
| 1783 SharedHeap(policy_), | |
| 1784 _g1_policy(policy_), | |
| 1111 | 1785 _dirty_card_queue_set(false), |
| 1705 | 1786 _into_cset_dirty_card_queue_set(false), |
|
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1787 _is_alive_closure_cm(this), |
|
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1788 _is_alive_closure_stw(this), |
|
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1789 _ref_processor_cm(NULL), |
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1790 _ref_processor_stw(NULL), |
| 342 | 1791 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), |
| 1792 _bot_shared(NULL), | |
| 1793 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
| 1794 _evac_failure_scan_stack(NULL) , | |
| 1795 _mark_in_progress(false), | |
| 2152 | 1796 _cg1r(NULL), _summary_bytes_used(0), |
|
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|
1797 _g1mm(NULL), |
| 342 | 1798 _refine_cte_cl(NULL), |
| 1799 _full_collection(false), | |
| 2152 | 1800 _free_list("Master Free List"), |
| 1801 _secondary_free_list("Secondary Free List"), | |
| 1802 _humongous_set("Master Humongous Set"), | |
| 1803 _free_regions_coming(false), | |
| 342 | 1804 _young_list(new YoungList(this)), |
| 1805 _gc_time_stamp(0), | |
|
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1806 _retained_old_gc_alloc_region(NULL), |
| 526 | 1807 _surviving_young_words(NULL), |
|
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|
1808 _full_collections_completed(0), |
| 526 | 1809 _in_cset_fast_test(NULL), |
|
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1810 _in_cset_fast_test_base(NULL), |
|
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1811 _dirty_cards_region_list(NULL) { |
| 342 | 1812 _g1h = this; // To catch bugs. |
| 1813 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
| 1814 vm_exit_during_initialization("Failed necessary allocation."); | |
| 1815 } | |
|
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1816 |
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1817 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1818 |
| 342 | 1819 int n_queues = MAX2((int)ParallelGCThreads, 1); |
| 1820 _task_queues = new RefToScanQueueSet(n_queues); | |
| 1821 | |
| 1822 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
| 1823 assert(n_rem_sets > 0, "Invariant."); | |
| 1824 | |
| 1825 HeapRegionRemSetIterator** iter_arr = | |
| 1826 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
| 1827 for (int i = 0; i < n_queues; i++) { | |
| 1828 iter_arr[i] = new HeapRegionRemSetIterator(); | |
| 1829 } | |
| 1830 _rem_set_iterator = iter_arr; | |
| 1831 | |
| 1832 for (int i = 0; i < n_queues; i++) { | |
| 1833 RefToScanQueue* q = new RefToScanQueue(); | |
| 1834 q->initialize(); | |
| 1835 _task_queues->register_queue(i, q); | |
| 1836 } | |
| 1837 | |
| 1838 guarantee(_task_queues != NULL, "task_queues allocation failure."); | |
| 1839 } | |
| 1840 | |
| 1841 jint G1CollectedHeap::initialize() { | |
| 1166 | 1842 CollectedHeap::pre_initialize(); |
| 342 | 1843 os::enable_vtime(); |
| 1844 | |
| 1845 // Necessary to satisfy locking discipline assertions. | |
| 1846 | |
| 1847 MutexLocker x(Heap_lock); | |
| 1848 | |
|
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1849 // We have to initialize the printer before committing the heap, as |
|
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1850 // it will be used then. |
|
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1851 _hr_printer.set_active(G1PrintHeapRegions); |
|
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1852 |
| 342 | 1853 // While there are no constraints in the GC code that HeapWordSize |
| 1854 // be any particular value, there are multiple other areas in the | |
| 1855 // system which believe this to be true (e.g. oop->object_size in some | |
| 1856 // cases incorrectly returns the size in wordSize units rather than | |
| 1857 // HeapWordSize). | |
| 1858 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
| 1859 | |
| 1860 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
| 1861 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
| 1862 | |
| 1863 // Ensure that the sizes are properly aligned. | |
| 1864 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1865 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1866 | |
| 1867 _cg1r = new ConcurrentG1Refine(); | |
| 1868 | |
| 1869 // Reserve the maximum. | |
| 1870 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
| 1871 // Includes the perm-gen. | |
|
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1872 |
|
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1873 // When compressed oops are enabled, the preferred heap base |
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1874 // is calculated by subtracting the requested size from the |
|
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1875 // 32Gb boundary and using the result as the base address for |
|
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1876 // heap reservation. If the requested size is not aligned to |
|
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1877 // HeapRegion::GrainBytes (i.e. the alignment that is passed |
|
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1878 // into the ReservedHeapSpace constructor) then the actual |
|
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1879 // base of the reserved heap may end up differing from the |
|
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|
1880 // address that was requested (i.e. the preferred heap base). |
|
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1881 // If this happens then we could end up using a non-optimal |
|
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|
1882 // compressed oops mode. |
|
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|
1883 |
|
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|
1884 // Since max_byte_size is aligned to the size of a heap region (checked |
|
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1885 // above), we also need to align the perm gen size as it might not be. |
|
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|
1886 const size_t total_reserved = max_byte_size + |
|
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|
1887 align_size_up(pgs->max_size(), HeapRegion::GrainBytes); |
|
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|
1888 Universe::check_alignment(total_reserved, HeapRegion::GrainBytes, "g1 heap and perm"); |
|
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1889 |
|
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1890 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1891 |
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1892 ReservedHeapSpace heap_rs(total_reserved, HeapRegion::GrainBytes, |
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1893 UseLargePages, addr); |
|
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1894 |
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1895 if (UseCompressedOops) { |
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1896 if (addr != NULL && !heap_rs.is_reserved()) { |
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1897 // Failed to reserve at specified address - the requested memory |
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1898 // region is taken already, for example, by 'java' launcher. |
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1899 // Try again to reserver heap higher. |
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1900 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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1901 |
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1902 ReservedHeapSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1903 UseLargePages, addr); |
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1904 |
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1905 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1906 // Failed to reserve at specified address again - give up. |
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1907 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1908 assert(addr == NULL, ""); |
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1909 |
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1910 ReservedHeapSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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1911 UseLargePages, addr); |
|
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1912 heap_rs = heap_rs1; |
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1913 } else { |
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1914 heap_rs = heap_rs0; |
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1915 } |
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1916 } |
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1917 } |
| 342 | 1918 |
| 1919 if (!heap_rs.is_reserved()) { | |
| 1920 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
| 1921 return JNI_ENOMEM; | |
| 1922 } | |
| 1923 | |
| 1924 // It is important to do this in a way such that concurrent readers can't | |
| 1925 // temporarily think somethings in the heap. (I've actually seen this | |
| 1926 // happen in asserts: DLD.) | |
| 1927 _reserved.set_word_size(0); | |
| 1928 _reserved.set_start((HeapWord*)heap_rs.base()); | |
| 1929 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 1930 | |
| 1931 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
| 1932 | |
| 1933 // Create the gen rem set (and barrier set) for the entire reserved region. | |
| 1934 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
| 1935 set_barrier_set(rem_set()->bs()); | |
| 1936 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
| 1937 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
| 1938 } else { | |
| 1939 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
| 1940 return JNI_ENOMEM; | |
| 1941 } | |
| 1942 | |
| 1943 // Also create a G1 rem set. | |
| 1861 | 1944 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { |
| 1945 _g1_rem_set = new G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
| 342 | 1946 } else { |
| 1861 | 1947 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); |
| 1948 return JNI_ENOMEM; | |
| 342 | 1949 } |
| 1950 | |
| 1951 // Carve out the G1 part of the heap. | |
| 1952 | |
| 1953 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
| 1954 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
| 1955 g1_rs.size()/HeapWordSize); | |
| 1956 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
| 1957 | |
| 1958 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
| 1959 | |
| 1960 _g1_storage.initialize(g1_rs, 0); | |
| 1961 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
| 3766 | 1962 _hrs.initialize((HeapWord*) _g1_reserved.start(), |
| 1963 (HeapWord*) _g1_reserved.end(), | |
| 1964 _expansion_regions); | |
| 342 | 1965 |
|
807
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1966 // 6843694 - ensure that the maximum region index can fit |
|
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1967 // in the remembered set structures. |
|
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1968 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
|
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1969 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
|
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1970 |
|
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1971 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
|
942
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1972 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
|
3986
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1973 guarantee(HeapRegion::CardsPerRegion < max_cards_per_region, |
|
942
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1974 "too many cards per region"); |
|
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1975 |
| 2152 | 1976 HeapRegionSet::set_unrealistically_long_length(max_regions() + 1); |
| 1977 | |
| 342 | 1978 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
| 1979 heap_word_size(init_byte_size)); | |
| 1980 | |
| 1981 _g1h = this; | |
| 1982 | |
|
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1983 _in_cset_fast_test_length = max_regions(); |
|
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1984 _in_cset_fast_test_base = NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); |
|
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1985 |
|
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1986 // We're biasing _in_cset_fast_test to avoid subtracting the |
|
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1987 // beginning of the heap every time we want to index; basically |
|
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1988 // it's the same with what we do with the card table. |
|
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1989 _in_cset_fast_test = _in_cset_fast_test_base - |
|
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1990 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
|
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1991 |
|
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1992 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
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1993 // regions to the incremental collection set for the first |
|
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1994 // evacuation pause. |
|
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|
1995 clear_cset_fast_test(); |
|
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1996 |
| 342 | 1997 // Create the ConcurrentMark data structure and thread. |
| 1998 // (Must do this late, so that "max_regions" is defined.) | |
| 1999 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
| 2000 _cmThread = _cm->cmThread(); | |
| 2001 | |
| 2002 // Initialize the from_card cache structure of HeapRegionRemSet. | |
| 2003 HeapRegionRemSet::init_heap(max_regions()); | |
| 2004 | |
| 677 | 2005 // Now expand into the initial heap size. |
|
2188
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|
2006 if (!expand(init_byte_size)) { |
|
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|
2007 vm_exit_during_initialization("Failed to allocate initial heap."); |
|
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|
2008 return JNI_ENOMEM; |
|
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|
2009 } |
| 342 | 2010 |
| 2011 // Perform any initialization actions delegated to the policy. | |
| 2012 g1_policy()->init(); | |
| 2013 | |
| 2014 _refine_cte_cl = | |
| 2015 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
| 2016 g1_rem_set(), | |
| 2017 concurrent_g1_refine()); | |
| 2018 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 2019 | |
| 2020 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
| 2021 SATB_Q_FL_lock, | |
| 1111 | 2022 G1SATBProcessCompletedThreshold, |
| 342 | 2023 Shared_SATB_Q_lock); |
| 794 | 2024 |
| 2025 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
| 2026 DirtyCardQ_FL_lock, | |
| 1111 | 2027 concurrent_g1_refine()->yellow_zone(), |
| 2028 concurrent_g1_refine()->red_zone(), | |
| 794 | 2029 Shared_DirtyCardQ_lock); |
| 2030 | |
|
616
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|
2031 if (G1DeferredRSUpdate) { |
|
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|
2032 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
|
4f360ec815ba
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|
2033 DirtyCardQ_FL_lock, |
| 1111 | 2034 -1, // never trigger processing |
| 2035 -1, // no limit on length | |
|
616
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|
2036 Shared_DirtyCardQ_lock, |
|
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|
2037 &JavaThread::dirty_card_queue_set()); |
|
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|
2038 } |
| 1705 | 2039 |
| 2040 // Initialize the card queue set used to hold cards containing | |
| 2041 // references into the collection set. | |
| 2042 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
| 2043 DirtyCardQ_FL_lock, | |
| 2044 -1, // never trigger processing | |
| 2045 -1, // no limit on length | |
| 2046 Shared_DirtyCardQ_lock, | |
| 2047 &JavaThread::dirty_card_queue_set()); | |
| 2048 | |
| 342 | 2049 // In case we're keeping closure specialization stats, initialize those |
| 2050 // counts and that mechanism. | |
| 2051 SpecializationStats::clear(); | |
| 2052 | |
| 2053 // Do later initialization work for concurrent refinement. | |
| 2054 _cg1r->init(); | |
| 2055 | |
|
2433
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|
2056 // Here we allocate the dummy full region that is required by the |
|
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|
2057 // G1AllocRegion class. If we don't pass an address in the reserved |
|
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|
2058 // space here, lots of asserts fire. |
| 3766 | 2059 |
| 2060 HeapRegion* dummy_region = new_heap_region(0 /* index of bottom region */, | |
| 2061 _g1_reserved.start()); | |
|
2433
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|
2062 // We'll re-use the same region whether the alloc region will |
|
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|
2063 // require BOT updates or not and, if it doesn't, then a non-young |
|
abdfc822206f
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|
2064 // region will complain that it cannot support allocations without |
|
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|
2065 // BOT updates. So we'll tag the dummy region as young to avoid that. |
|
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|
2066 dummy_region->set_young(); |
|
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|
2067 // Make sure it's full. |
|
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|
2068 dummy_region->set_top(dummy_region->end()); |
|
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|
2069 G1AllocRegion::setup(this, dummy_region); |
|
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|
2070 |
|
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|
2071 init_mutator_alloc_region(); |
|
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|
2072 |
|
3289
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6946417: G1: Java VisualVM does not support G1 properly.
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|
2073 // Do create of the monitoring and management support so that |
|
b52782ae3880
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|
2074 // values in the heap have been properly initialized. |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
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diff
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|
2075 _g1mm = new G1MonitoringSupport(this); |
|
3289
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|
2076 |
| 342 | 2077 return JNI_OK; |
| 2078 } | |
| 2079 | |
| 2080 void G1CollectedHeap::ref_processing_init() { | |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
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diff
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|
2081 // Reference processing in G1 currently works as follows: |
|
fd1d227ef1b9
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diff
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|
2082 // |
|
3979
4dfb2df418f2
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|
2083 // * There are two reference processor instances. One is |
|
4dfb2df418f2
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|
2084 // used to record and process discovered references |
|
4dfb2df418f2
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diff
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|
2085 // during concurrent marking; the other is used to |
|
4dfb2df418f2
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diff
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|
2086 // record and process references during STW pauses |
|
4dfb2df418f2
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diff
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|
2087 // (both full and incremental). |
|
4dfb2df418f2
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|
2088 // * Both ref processors need to 'span' the entire heap as |
|
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changeset
|
2089 // the regions in the collection set may be dotted around. |
|
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|
2090 // |
|
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|
2091 // * For the concurrent marking ref processor: |
|
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|
2092 // * Reference discovery is enabled at initial marking. |
|
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changeset
|
2093 // * Reference discovery is disabled and the discovered |
|
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|
2094 // references processed etc during remarking. |
|
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|
2095 // * Reference discovery is MT (see below). |
|
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|
2096 // * Reference discovery requires a barrier (see below). |
|
4dfb2df418f2
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|
2097 // * Reference processing may or may not be MT |
|
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|
2098 // (depending on the value of ParallelRefProcEnabled |
|
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|
2099 // and ParallelGCThreads). |
|
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|
2100 // * A full GC disables reference discovery by the CM |
|
4dfb2df418f2
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|
2101 // ref processor and abandons any entries on it's |
|
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|
2102 // discovered lists. |
|
4dfb2df418f2
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|
2103 // |
|
4dfb2df418f2
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changeset
|
2104 // * For the STW processor: |
|
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|
2105 // * Non MT discovery is enabled at the start of a full GC. |
|
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|
2106 // * Processing and enqueueing during a full GC is non-MT. |
|
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|
2107 // * During a full GC, references are processed after marking. |
|
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|
2108 // |
|
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|
2109 // * Discovery (may or may not be MT) is enabled at the start |
|
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|
2110 // of an incremental evacuation pause. |
|
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|
2111 // * References are processed near the end of a STW evacuation pause. |
|
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|
2112 // * For both types of GC: |
|
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|
2113 // * Discovery is atomic - i.e. not concurrent. |
|
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|
2114 // * Reference discovery will not need a barrier. |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
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diff
changeset
|
2115 |
| 342 | 2116 SharedHeap::ref_processing_init(); |
| 2117 MemRegion mr = reserved_region(); | |
|
3979
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|
2118 |
|
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|
2119 // Concurrent Mark ref processor |
|
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changeset
|
2120 _ref_processor_cm = |
|
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
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2361
diff
changeset
|
2121 new ReferenceProcessor(mr, // span |
|
3979
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|
2122 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
|
4dfb2df418f2
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diff
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|
2123 // mt processing |
|
4dfb2df418f2
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diff
changeset
|
2124 (int) ParallelGCThreads, |
|
4dfb2df418f2
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diff
changeset
|
2125 // degree of mt processing |
|
4dfb2df418f2
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diff
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|
2126 (ParallelGCThreads > 1) || (ConcGCThreads > 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
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|
2127 // mt discovery |
|
4dfb2df418f2
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3973
diff
changeset
|
2128 (int) MAX2(ParallelGCThreads, ConcGCThreads), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2129 // degree of mt discovery |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2130 false, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2131 // Reference discovery is not atomic |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
2132 &_is_alive_closure_cm, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
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|
2133 // is alive closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2134 // (for efficiency/performance) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2135 true); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2136 // Setting next fields of discovered |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2137 // lists requires a barrier. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2138 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
2139 // STW ref processor |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2140 _ref_processor_stw = |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2141 new ReferenceProcessor(mr, // span |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2142 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2143 // mt processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2144 MAX2((int)ParallelGCThreads, 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2145 // degree of mt processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2146 (ParallelGCThreads > 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2147 // mt discovery |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2148 MAX2((int)ParallelGCThreads, 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2149 // degree of mt discovery |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2150 true, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2151 // Reference discovery is atomic |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2152 &_is_alive_closure_stw, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2153 // is alive closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2154 // (for efficiency/performance) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2155 false); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2156 // Setting next fields of discovered |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
2157 // lists requires a barrier. |
| 342 | 2158 } |
| 2159 | |
| 2160 size_t G1CollectedHeap::capacity() const { | |
| 2161 return _g1_committed.byte_size(); | |
| 2162 } | |
| 2163 | |
| 1705 | 2164 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
| 2165 DirtyCardQueue* into_cset_dcq, | |
| 2166 bool concurrent, | |
| 342 | 2167 int worker_i) { |
| 889 | 2168 // Clean cards in the hot card cache |
| 1705 | 2169 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set(), into_cset_dcq); |
| 889 | 2170 |
| 342 | 2171 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
| 2172 int n_completed_buffers = 0; | |
| 1705 | 2173 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
| 342 | 2174 n_completed_buffers++; |
| 2175 } | |
| 2176 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
| 2177 (double) n_completed_buffers); | |
| 2178 dcqs.clear_n_completed_buffers(); | |
| 2179 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
| 2180 } | |
| 2181 | |
| 2182 | |
| 2183 // Computes the sum of the storage used by the various regions. | |
| 2184 | |
| 2185 size_t G1CollectedHeap::used() const { | |
|
862
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
ysr
parents:
861
diff
changeset
|
2186 assert(Heap_lock->owner() != NULL, |
|
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
ysr
parents:
861
diff
changeset
|
2187 "Should be owned on this thread's behalf."); |
| 342 | 2188 size_t result = _summary_bytes_used; |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2189 // Read only once in case it is set to NULL concurrently |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2190 HeapRegion* hr = _mutator_alloc_region.get(); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2191 if (hr != NULL) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2192 result += hr->used(); |
| 342 | 2193 return result; |
| 2194 } | |
| 2195 | |
|
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2196 size_t G1CollectedHeap::used_unlocked() const { |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2197 size_t result = _summary_bytes_used; |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2198 return result; |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2199 } |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2200 |
| 342 | 2201 class SumUsedClosure: public HeapRegionClosure { |
| 2202 size_t _used; | |
| 2203 public: | |
| 2204 SumUsedClosure() : _used(0) {} | |
| 2205 bool doHeapRegion(HeapRegion* r) { | |
| 2206 if (!r->continuesHumongous()) { | |
| 2207 _used += r->used(); | |
| 2208 } | |
| 2209 return false; | |
| 2210 } | |
| 2211 size_t result() { return _used; } | |
| 2212 }; | |
| 2213 | |
| 2214 size_t G1CollectedHeap::recalculate_used() const { | |
| 2215 SumUsedClosure blk; | |
| 3766 | 2216 heap_region_iterate(&blk); |
| 342 | 2217 return blk.result(); |
| 2218 } | |
| 2219 | |
| 2220 size_t G1CollectedHeap::unsafe_max_alloc() { | |
| 2152 | 2221 if (free_regions() > 0) return HeapRegion::GrainBytes; |
| 342 | 2222 // otherwise, is there space in the current allocation region? |
| 2223 | |
| 2224 // We need to store the current allocation region in a local variable | |
| 2225 // here. The problem is that this method doesn't take any locks and | |
| 2226 // there may be other threads which overwrite the current allocation | |
| 2227 // region field. attempt_allocation(), for example, sets it to NULL | |
| 2228 // and this can happen *after* the NULL check here but before the call | |
| 2229 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
| 2230 // to be a problem in the optimized build, since the two loads of the | |
| 2231 // current allocation region field are optimized away. | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2232 HeapRegion* hr = _mutator_alloc_region.get(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
2233 if (hr == NULL) { |
| 342 | 2234 return 0; |
| 2235 } | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
2236 return hr->free(); |
| 342 | 2237 } |
| 2238 | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2239 bool G1CollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2240 return |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2241 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2242 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2243 } |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2244 |
|
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
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2433
diff
changeset
|
2245 #ifndef PRODUCT |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2246 void G1CollectedHeap::allocate_dummy_regions() { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2247 // Let's fill up most of the region |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2248 size_t word_size = HeapRegion::GrainWords - 1024; |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2249 // And as a result the region we'll allocate will be humongous. |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2250 guarantee(isHumongous(word_size), "sanity"); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2251 |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2252 for (uintx i = 0; i < G1DummyRegionsPerGC; ++i) { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2253 // Let's use the existing mechanism for the allocation |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2254 HeapWord* dummy_obj = humongous_obj_allocate(word_size); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2255 if (dummy_obj != NULL) { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2256 MemRegion mr(dummy_obj, word_size); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2257 CollectedHeap::fill_with_object(mr); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2258 } else { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2259 // If we can't allocate once, we probably cannot allocate |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2260 // again. Let's get out of the loop. |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2261 break; |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2262 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2263 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2264 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2265 #endif // !PRODUCT |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2266 |
|
2030
fb712ff22571
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|
2267 void G1CollectedHeap::increment_full_collections_completed(bool concurrent) { |
|
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2268 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
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2269 |
|
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|
2270 // We assume that if concurrent == true, then the caller is a |
|
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2271 // concurrent thread that was joined the Suspendible Thread |
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2272 // Set. If there's ever a cheap way to check this, we should add an |
|
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2273 // assert here. |
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2274 |
|
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2275 // We have already incremented _total_full_collections at the start |
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2276 // of the GC, so total_full_collections() represents how many full |
|
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2277 // collections have been started. |
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|
2278 unsigned int full_collections_started = total_full_collections(); |
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|
2279 |
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2280 // Given that this method is called at the end of a Full GC or of a |
|
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2281 // concurrent cycle, and those can be nested (i.e., a Full GC can |
|
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2282 // interrupt a concurrent cycle), the number of full collections |
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2283 // completed should be either one (in the case where there was no |
|
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2284 // nesting) or two (when a Full GC interrupted a concurrent cycle) |
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2285 // behind the number of full collections started. |
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|
2286 |
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|
2287 // This is the case for the inner caller, i.e. a Full GC. |
|
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2288 assert(concurrent || |
|
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2289 (full_collections_started == _full_collections_completed + 1) || |
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|
2290 (full_collections_started == _full_collections_completed + 2), |
|
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|
2291 err_msg("for inner caller (Full GC): full_collections_started = %u " |
|
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|
2292 "is inconsistent with _full_collections_completed = %u", |
|
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|
2293 full_collections_started, _full_collections_completed)); |
|
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2294 |
|
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|
2295 // This is the case for the outer caller, i.e. the concurrent cycle. |
|
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|
2296 assert(!concurrent || |
|
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|
2297 (full_collections_started == _full_collections_completed + 1), |
|
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2298 err_msg("for outer caller (concurrent cycle): " |
|
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|
2299 "full_collections_started = %u " |
|
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|
2300 "is inconsistent with _full_collections_completed = %u", |
|
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|
2301 full_collections_started, _full_collections_completed)); |
|
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|
2302 |
|
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|
2303 _full_collections_completed += 1; |
|
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|
2304 |
|
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|
2305 // We need to clear the "in_progress" flag in the CM thread before |
|
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|
2306 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
|
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|
2307 // is set) so that if a waiter requests another System.gc() it doesn't |
|
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|
2308 // incorrectly see that a marking cyle is still in progress. |
|
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|
2309 if (concurrent) { |
|
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|
2310 _cmThread->clear_in_progress(); |
|
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|
2311 } |
|
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|
2312 |
|
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|
2313 // This notify_all() will ensure that a thread that called |
|
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|
2314 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
|
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|
2315 // and it's waiting for a full GC to finish will be woken up. It is |
|
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|
2316 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
|
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|
2317 FullGCCount_lock->notify_all(); |
|
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|
2318 } |
|
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|
2319 |
| 342 | 2320 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
| 2152 | 2321 assert_at_safepoint(true /* should_be_vm_thread */); |
| 342 | 2322 GCCauseSetter gcs(this, cause); |
| 2323 switch (cause) { | |
| 2324 case GCCause::_heap_inspection: | |
| 2325 case GCCause::_heap_dump: { | |
| 2326 HandleMark hm; | |
| 2327 do_full_collection(false); // don't clear all soft refs | |
| 2328 break; | |
| 2329 } | |
| 2330 default: // XXX FIX ME | |
| 2331 ShouldNotReachHere(); // Unexpected use of this function | |
| 2332 } | |
| 2333 } | |
| 2334 | |
|
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|
2335 void G1CollectedHeap::collect(GCCause::Cause cause) { |
|
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|
2336 // The caller doesn't have the Heap_lock |
|
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|
2337 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
|
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|
2338 |
|
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|
2339 unsigned int gc_count_before; |
|
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|
2340 unsigned int full_gc_count_before; |
| 342 | 2341 { |
|
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|
2342 MutexLocker ml(Heap_lock); |
| 1973 | 2343 |
|
1088
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|
2344 // Read the GC count while holding the Heap_lock |
|
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|
2345 gc_count_before = SharedHeap::heap()->total_collections(); |
|
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|
2346 full_gc_count_before = SharedHeap::heap()->total_full_collections(); |
|
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|
2347 } |
|
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|
2348 |
|
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|
2349 if (should_do_concurrent_full_gc(cause)) { |
|
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|
2350 // Schedule an initial-mark evacuation pause that will start a |
| 1973 | 2351 // concurrent cycle. We're setting word_size to 0 which means that |
| 2352 // we are not requesting a post-GC allocation. | |
|
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|
2353 VM_G1IncCollectionPause op(gc_count_before, |
| 1973 | 2354 0, /* word_size */ |
| 2355 true, /* should_initiate_conc_mark */ | |
|
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|
2356 g1_policy()->max_pause_time_ms(), |
|
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|
2357 cause); |
|
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|
2358 VMThread::execute(&op); |
|
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|
2359 } else { |
|
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|
2360 if (cause == GCCause::_gc_locker |
|
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|
2361 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
|
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|
2362 |
| 1973 | 2363 // Schedule a standard evacuation pause. We're setting word_size |
| 2364 // to 0 which means that we are not requesting a post-GC allocation. | |
|
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|
2365 VM_G1IncCollectionPause op(gc_count_before, |
| 1973 | 2366 0, /* word_size */ |
|
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|
2367 false, /* should_initiate_conc_mark */ |
|
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|
2368 g1_policy()->max_pause_time_ms(), |
|
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|
2369 cause); |
|
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|
2370 VMThread::execute(&op); |
|
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|
2371 } else { |
|
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|
2372 // Schedule a Full GC. |
|
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|
2373 VM_G1CollectFull op(gc_count_before, full_gc_count_before, cause); |
|
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|
2374 VMThread::execute(&op); |
|
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|
2375 } |
| 342 | 2376 } |
| 2377 } | |
| 2378 | |
| 2379 bool G1CollectedHeap::is_in(const void* p) const { | |
| 3766 | 2380 HeapRegion* hr = _hrs.addr_to_region((HeapWord*) p); |
| 2381 if (hr != NULL) { | |
| 342 | 2382 return hr->is_in(p); |
| 2383 } else { | |
| 2384 return _perm_gen->as_gen()->is_in(p); | |
| 2385 } | |
| 2386 } | |
| 2387 | |
| 2388 // Iteration functions. | |
| 2389 | |
| 2390 // Iterates an OopClosure over all ref-containing fields of objects | |
| 2391 // within a HeapRegion. | |
| 2392 | |
| 2393 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
| 2394 MemRegion _mr; | |
| 2395 OopClosure* _cl; | |
| 2396 public: | |
| 2397 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
| 2398 : _mr(mr), _cl(cl) {} | |
| 2399 bool doHeapRegion(HeapRegion* r) { | |
| 2400 if (! r->continuesHumongous()) { | |
| 2401 r->oop_iterate(_cl); | |
| 2402 } | |
| 2403 return false; | |
| 2404 } | |
| 2405 }; | |
| 2406 | |
| 678 | 2407 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
| 342 | 2408 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
| 3766 | 2409 heap_region_iterate(&blk); |
| 678 | 2410 if (do_perm) { |
| 2411 perm_gen()->oop_iterate(cl); | |
| 2412 } | |
| 342 | 2413 } |
| 2414 | |
| 678 | 2415 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
| 342 | 2416 IterateOopClosureRegionClosure blk(mr, cl); |
| 3766 | 2417 heap_region_iterate(&blk); |
| 678 | 2418 if (do_perm) { |
| 2419 perm_gen()->oop_iterate(cl); | |
| 2420 } | |
| 342 | 2421 } |
| 2422 | |
| 2423 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
| 2424 | |
| 2425 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
| 2426 ObjectClosure* _cl; | |
| 2427 public: | |
| 2428 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
| 2429 bool doHeapRegion(HeapRegion* r) { | |
| 2430 if (! r->continuesHumongous()) { | |
| 2431 r->object_iterate(_cl); | |
| 2432 } | |
| 2433 return false; | |
| 2434 } | |
| 2435 }; | |
| 2436 | |
| 678 | 2437 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
| 342 | 2438 IterateObjectClosureRegionClosure blk(cl); |
| 3766 | 2439 heap_region_iterate(&blk); |
| 678 | 2440 if (do_perm) { |
| 2441 perm_gen()->object_iterate(cl); | |
| 2442 } | |
| 342 | 2443 } |
| 2444 | |
| 2445 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
| 2446 // FIXME: is this right? | |
| 2447 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
| 2448 } | |
| 2449 | |
| 2450 // Calls a SpaceClosure on a HeapRegion. | |
| 2451 | |
| 2452 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
| 2453 SpaceClosure* _cl; | |
| 2454 public: | |
| 2455 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
| 2456 bool doHeapRegion(HeapRegion* r) { | |
| 2457 _cl->do_space(r); | |
| 2458 return false; | |
| 2459 } | |
| 2460 }; | |
| 2461 | |
| 2462 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
| 2463 SpaceClosureRegionClosure blk(cl); | |
| 3766 | 2464 heap_region_iterate(&blk); |
| 342 | 2465 } |
| 2466 | |
| 3766 | 2467 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const { |
| 2468 _hrs.iterate(cl); | |
| 342 | 2469 } |
| 2470 | |
| 2471 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
| 3766 | 2472 HeapRegionClosure* cl) const { |
| 2473 _hrs.iterate_from(r, cl); | |
| 342 | 2474 } |
| 2475 | |
| 2476 void | |
| 2477 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
| 2478 int worker, | |
| 2479 jint claim_value) { | |
| 355 | 2480 const size_t regions = n_regions(); |
|
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|
2481 const size_t worker_num = (G1CollectedHeap::use_parallel_gc_threads() ? ParallelGCThreads : 1); |
| 355 | 2482 // try to spread out the starting points of the workers |
| 2483 const size_t start_index = regions / worker_num * (size_t) worker; | |
| 2484 | |
| 2485 // each worker will actually look at all regions | |
| 2486 for (size_t count = 0; count < regions; ++count) { | |
| 2487 const size_t index = (start_index + count) % regions; | |
| 2488 assert(0 <= index && index < regions, "sanity"); | |
| 2489 HeapRegion* r = region_at(index); | |
| 2490 // we'll ignore "continues humongous" regions (we'll process them | |
| 2491 // when we come across their corresponding "start humongous" | |
| 2492 // region) and regions already claimed | |
| 2493 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
| 2494 continue; | |
| 2495 } | |
| 2496 // OK, try to claim it | |
| 342 | 2497 if (r->claimHeapRegion(claim_value)) { |
| 355 | 2498 // success! |
| 2499 assert(!r->continuesHumongous(), "sanity"); | |
| 2500 if (r->startsHumongous()) { | |
| 2501 // If the region is "starts humongous" we'll iterate over its | |
| 2502 // "continues humongous" first; in fact we'll do them | |
| 2503 // first. The order is important. In on case, calling the | |
| 2504 // closure on the "starts humongous" region might de-allocate | |
| 2505 // and clear all its "continues humongous" regions and, as a | |
| 2506 // result, we might end up processing them twice. So, we'll do | |
| 2507 // them first (notice: most closures will ignore them anyway) and | |
| 2508 // then we'll do the "starts humongous" region. | |
| 2509 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
| 2510 HeapRegion* chr = region_at(ch_index); | |
| 2511 | |
| 2512 // if the region has already been claimed or it's not | |
| 2513 // "continues humongous" we're done | |
| 2514 if (chr->claim_value() == claim_value || | |
| 2515 !chr->continuesHumongous()) { | |
| 2516 break; | |
| 2517 } | |
| 2518 | |
| 2519 // Noone should have claimed it directly. We can given | |
| 2520 // that we claimed its "starts humongous" region. | |
| 2521 assert(chr->claim_value() != claim_value, "sanity"); | |
| 2522 assert(chr->humongous_start_region() == r, "sanity"); | |
| 2523 | |
| 2524 if (chr->claimHeapRegion(claim_value)) { | |
| 2525 // we should always be able to claim it; noone else should | |
| 2526 // be trying to claim this region | |
| 2527 | |
| 2528 bool res2 = cl->doHeapRegion(chr); | |
| 2529 assert(!res2, "Should not abort"); | |
| 2530 | |
| 2531 // Right now, this holds (i.e., no closure that actually | |
| 2532 // does something with "continues humongous" regions | |
| 2533 // clears them). We might have to weaken it in the future, | |
| 2534 // but let's leave these two asserts here for extra safety. | |
| 2535 assert(chr->continuesHumongous(), "should still be the case"); | |
| 2536 assert(chr->humongous_start_region() == r, "sanity"); | |
| 2537 } else { | |
| 2538 guarantee(false, "we should not reach here"); | |
| 2539 } | |
| 2540 } | |
| 2541 } | |
| 2542 | |
| 2543 assert(!r->continuesHumongous(), "sanity"); | |
| 2544 bool res = cl->doHeapRegion(r); | |
| 2545 assert(!res, "Should not abort"); | |
| 2546 } | |
| 2547 } | |
| 2548 } | |
| 2549 | |
| 390 | 2550 class ResetClaimValuesClosure: public HeapRegionClosure { |
| 2551 public: | |
| 2552 bool doHeapRegion(HeapRegion* r) { | |
| 2553 r->set_claim_value(HeapRegion::InitialClaimValue); | |
| 2554 return false; | |
| 2555 } | |
| 2556 }; | |
| 2557 | |
| 2558 void | |
| 2559 G1CollectedHeap::reset_heap_region_claim_values() { | |
| 2560 ResetClaimValuesClosure blk; | |
| 2561 heap_region_iterate(&blk); | |
| 2562 } | |
| 2563 | |
| 355 | 2564 #ifdef ASSERT |
| 2565 // This checks whether all regions in the heap have the correct claim | |
| 2566 // value. I also piggy-backed on this a check to ensure that the | |
| 2567 // humongous_start_region() information on "continues humongous" | |
| 2568 // regions is correct. | |
| 2569 | |
| 2570 class CheckClaimValuesClosure : public HeapRegionClosure { | |
| 2571 private: | |
| 2572 jint _claim_value; | |
| 2573 size_t _failures; | |
| 2574 HeapRegion* _sh_region; | |
| 2575 public: | |
| 2576 CheckClaimValuesClosure(jint claim_value) : | |
| 2577 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
| 2578 bool doHeapRegion(HeapRegion* r) { | |
| 2579 if (r->claim_value() != _claim_value) { | |
| 2580 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
| 2581 "claim value = %d, should be %d", | |
| 2582 r->bottom(), r->end(), r->claim_value(), | |
| 2583 _claim_value); | |
| 2584 ++_failures; | |
| 2585 } | |
| 2586 if (!r->isHumongous()) { | |
| 2587 _sh_region = NULL; | |
| 2588 } else if (r->startsHumongous()) { | |
| 2589 _sh_region = r; | |
| 2590 } else if (r->continuesHumongous()) { | |
| 2591 if (r->humongous_start_region() != _sh_region) { | |
| 2592 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
| 2593 "HS = "PTR_FORMAT", should be "PTR_FORMAT, | |
| 2594 r->bottom(), r->end(), | |
| 2595 r->humongous_start_region(), | |
| 2596 _sh_region); | |
| 2597 ++_failures; | |
| 342 | 2598 } |
| 2599 } | |
| 355 | 2600 return false; |
| 2601 } | |
| 2602 size_t failures() { | |
| 2603 return _failures; | |
| 2604 } | |
| 2605 }; | |
| 2606 | |
| 2607 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
| 2608 CheckClaimValuesClosure cl(claim_value); | |
| 2609 heap_region_iterate(&cl); | |
| 2610 return cl.failures() == 0; | |
| 2611 } | |
| 2612 #endif // ASSERT | |
| 342 | 2613 |
| 2614 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { | |
| 2615 HeapRegion* r = g1_policy()->collection_set(); | |
| 2616 while (r != NULL) { | |
| 2617 HeapRegion* next = r->next_in_collection_set(); | |
| 2618 if (cl->doHeapRegion(r)) { | |
| 2619 cl->incomplete(); | |
| 2620 return; | |
| 2621 } | |
| 2622 r = next; | |
| 2623 } | |
| 2624 } | |
| 2625 | |
| 2626 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
| 2627 HeapRegionClosure *cl) { | |
|
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2628 if (r == NULL) { |
|
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2629 // The CSet is empty so there's nothing to do. |
|
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|
2630 return; |
|
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|
2631 } |
|
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2632 |
| 342 | 2633 assert(r->in_collection_set(), |
| 2634 "Start region must be a member of the collection set."); | |
| 2635 HeapRegion* cur = r; | |
| 2636 while (cur != NULL) { | |
| 2637 HeapRegion* next = cur->next_in_collection_set(); | |
| 2638 if (cl->doHeapRegion(cur) && false) { | |
| 2639 cl->incomplete(); | |
| 2640 return; | |
| 2641 } | |
| 2642 cur = next; | |
| 2643 } | |
| 2644 cur = g1_policy()->collection_set(); | |
| 2645 while (cur != r) { | |
| 2646 HeapRegion* next = cur->next_in_collection_set(); | |
| 2647 if (cl->doHeapRegion(cur) && false) { | |
| 2648 cl->incomplete(); | |
| 2649 return; | |
| 2650 } | |
| 2651 cur = next; | |
| 2652 } | |
| 2653 } | |
| 2654 | |
| 2655 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
| 3766 | 2656 return n_regions() > 0 ? region_at(0) : NULL; |
| 342 | 2657 } |
| 2658 | |
| 2659 | |
| 2660 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
| 2661 Space* res = heap_region_containing(addr); | |
| 2662 if (res == NULL) | |
| 2663 res = perm_gen()->space_containing(addr); | |
| 2664 return res; | |
| 2665 } | |
| 2666 | |
| 2667 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
| 2668 Space* sp = space_containing(addr); | |
| 2669 if (sp != NULL) { | |
| 2670 return sp->block_start(addr); | |
| 2671 } | |
| 2672 return NULL; | |
| 2673 } | |
| 2674 | |
| 2675 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
| 2676 Space* sp = space_containing(addr); | |
| 2677 assert(sp != NULL, "block_size of address outside of heap"); | |
| 2678 return sp->block_size(addr); | |
| 2679 } | |
| 2680 | |
| 2681 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
| 2682 Space* sp = space_containing(addr); | |
| 2683 return sp->block_is_obj(addr); | |
| 2684 } | |
| 2685 | |
| 2686 bool G1CollectedHeap::supports_tlab_allocation() const { | |
| 2687 return true; | |
| 2688 } | |
| 2689 | |
| 2690 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
| 2691 return HeapRegion::GrainBytes; | |
| 2692 } | |
| 2693 | |
| 2694 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
| 2695 // Return the remaining space in the cur alloc region, but not less than | |
| 2696 // the min TLAB size. | |
|
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2697 |
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2698 // Also, this value can be at most the humongous object threshold, |
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2699 // since we can't allow tlabs to grow big enough to accomodate |
|
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2700 // humongous objects. |
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2701 |
|
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|
2702 HeapRegion* hr = _mutator_alloc_region.get(); |
|
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2703 size_t max_tlab_size = _humongous_object_threshold_in_words * wordSize; |
|
2433
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2704 if (hr == NULL) { |
|
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2705 return max_tlab_size; |
| 342 | 2706 } else { |
|
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2707 return MIN2(MAX2(hr->free(), (size_t) MinTLABSize), max_tlab_size); |
| 342 | 2708 } |
| 2709 } | |
| 2710 | |
| 2711 size_t G1CollectedHeap::max_capacity() const { | |
|
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2712 return _g1_reserved.byte_size(); |
| 342 | 2713 } |
| 2714 | |
| 2715 jlong G1CollectedHeap::millis_since_last_gc() { | |
| 2716 // assert(false, "NYI"); | |
| 2717 return 0; | |
| 2718 } | |
| 2719 | |
| 2720 void G1CollectedHeap::prepare_for_verify() { | |
| 2721 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
| 2722 ensure_parsability(false); | |
| 2723 } | |
| 2724 g1_rem_set()->prepare_for_verify(); | |
| 2725 } | |
| 2726 | |
| 2727 class VerifyLivenessOopClosure: public OopClosure { | |
|
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2728 G1CollectedHeap* _g1h; |
|
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2729 VerifyOption _vo; |
| 342 | 2730 public: |
|
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2731 VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo): |
|
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2732 _g1h(g1h), _vo(vo) |
|
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2733 { } |
|
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2734 void do_oop(narrowOop *p) { do_oop_work(p); } |
|
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2735 void do_oop( oop *p) { do_oop_work(p); } |
|
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2736 |
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2737 template <class T> void do_oop_work(T *p) { |
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2738 oop obj = oopDesc::load_decode_heap_oop(p); |
|
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2739 guarantee(obj == NULL || !_g1h->is_obj_dead_cond(obj, _vo), |
|
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2740 "Dead object referenced by a not dead object"); |
| 342 | 2741 } |
| 2742 }; | |
| 2743 | |
| 2744 class VerifyObjsInRegionClosure: public ObjectClosure { | |
| 811 | 2745 private: |
| 342 | 2746 G1CollectedHeap* _g1h; |
| 2747 size_t _live_bytes; | |
| 2748 HeapRegion *_hr; | |
|
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|
2749 VerifyOption _vo; |
| 342 | 2750 public: |
|
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2751 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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2752 // _vo == UseNextMarking -> use "next" marking information, |
|
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2753 // _vo == UseMarkWord -> use mark word from object header. |
|
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2754 VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo) |
|
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2755 : _live_bytes(0), _hr(hr), _vo(vo) { |
| 342 | 2756 _g1h = G1CollectedHeap::heap(); |
| 2757 } | |
| 2758 void do_object(oop o) { | |
|
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2759 VerifyLivenessOopClosure isLive(_g1h, _vo); |
| 342 | 2760 assert(o != NULL, "Huh?"); |
|
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2761 if (!_g1h->is_obj_dead_cond(o, _vo)) { |
|
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|
2762 // If the object is alive according to the mark word, |
|
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|
2763 // then verify that the marking information agrees. |
|
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|
2764 // Note we can't verify the contra-positive of the |
|
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|
2765 // above: if the object is dead (according to the mark |
|
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|
2766 // word), it may not be marked, or may have been marked |
|
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|
2767 // but has since became dead, or may have been allocated |
|
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2768 // since the last marking. |
|
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|
2769 if (_vo == VerifyOption_G1UseMarkWord) { |
|
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|
2770 guarantee(!_g1h->is_obj_dead(o), "mark word and concurrent mark mismatch"); |
|
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|
2771 } |
|
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|
2772 |
| 342 | 2773 o->oop_iterate(&isLive); |
|
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|
2774 if (!_hr->obj_allocated_since_prev_marking(o)) { |
|
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|
2775 size_t obj_size = o->size(); // Make sure we don't overflow |
|
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|
2776 _live_bytes += (obj_size * HeapWordSize); |
|
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|
2777 } |
| 342 | 2778 } |
| 2779 } | |
| 2780 size_t live_bytes() { return _live_bytes; } | |
| 2781 }; | |
| 2782 | |
| 2783 class PrintObjsInRegionClosure : public ObjectClosure { | |
| 2784 HeapRegion *_hr; | |
| 2785 G1CollectedHeap *_g1; | |
| 2786 public: | |
| 2787 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
| 2788 _g1 = G1CollectedHeap::heap(); | |
| 2789 }; | |
| 2790 | |
| 2791 void do_object(oop o) { | |
| 2792 if (o != NULL) { | |
| 2793 HeapWord *start = (HeapWord *) o; | |
| 2794 size_t word_sz = o->size(); | |
| 2795 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
| 2796 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
| 2797 (void*) o, word_sz, | |
| 2798 _g1->isMarkedPrev(o), | |
| 2799 _g1->isMarkedNext(o), | |
| 2800 _hr->obj_allocated_since_prev_marking(o)); | |
| 2801 HeapWord *end = start + word_sz; | |
| 2802 HeapWord *cur; | |
| 2803 int *val; | |
| 2804 for (cur = start; cur < end; cur++) { | |
| 2805 val = (int *) cur; | |
| 2806 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
| 2807 } | |
| 2808 } | |
| 2809 } | |
| 2810 }; | |
| 2811 | |
| 2812 class VerifyRegionClosure: public HeapRegionClosure { | |
| 811 | 2813 private: |
|
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|
2814 bool _allow_dirty; |
|
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|
2815 bool _par; |
|
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|
2816 VerifyOption _vo; |
|
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2817 bool _failures; |
| 811 | 2818 public: |
|
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2819 // _vo == UsePrevMarking -> use "prev" marking information, |
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2820 // _vo == UseNextMarking -> use "next" marking information, |
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2821 // _vo == UseMarkWord -> use mark word from object header. |
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2822 VerifyRegionClosure(bool allow_dirty, bool par, VerifyOption vo) |
|
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2823 : _allow_dirty(allow_dirty), |
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2824 _par(par), |
|
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2825 _vo(vo), |
|
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|
2826 _failures(false) {} |
|
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|
2827 |
|
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|
2828 bool failures() { |
|
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2829 return _failures; |
|
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|
2830 } |
|
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2831 |
| 342 | 2832 bool doHeapRegion(HeapRegion* r) { |
| 390 | 2833 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
| 2834 "Should be unclaimed at verify points."); | |
|
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2835 if (!r->continuesHumongous()) { |
|
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|
2836 bool failures = false; |
|
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2837 r->verify(_allow_dirty, _vo, &failures); |
|
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|
2838 if (failures) { |
|
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|
2839 _failures = true; |
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|
2840 } else { |
|
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|
2841 VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo); |
|
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|
2842 r->object_iterate(¬_dead_yet_cl); |
|
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2843 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
|
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|
2844 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
|
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|
2845 "max_live_bytes "SIZE_FORMAT" " |
|
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|
2846 "< calculated "SIZE_FORMAT, |
|
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|
2847 r->bottom(), r->end(), |
|
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|
2848 r->max_live_bytes(), |
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|
2849 not_dead_yet_cl.live_bytes()); |
|
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|
2850 _failures = true; |
|
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|
2851 } |
|
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|
2852 } |
| 342 | 2853 } |
|
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|
2854 return false; // stop the region iteration if we hit a failure |
| 342 | 2855 } |
| 2856 }; | |
| 2857 | |
| 2858 class VerifyRootsClosure: public OopsInGenClosure { | |
| 2859 private: | |
| 2860 G1CollectedHeap* _g1h; | |
|
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|
2861 VerifyOption _vo; |
| 342 | 2862 bool _failures; |
| 2863 public: | |
|
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|
2864 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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|
2865 // _vo == UseNextMarking -> use "next" marking information, |
|
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|
2866 // _vo == UseMarkWord -> use mark word from object header. |
|
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|
2867 VerifyRootsClosure(VerifyOption vo) : |
|
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|
2868 _g1h(G1CollectedHeap::heap()), |
|
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|
2869 _vo(vo), |
|
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|
2870 _failures(false) { } |
| 342 | 2871 |
| 2872 bool failures() { return _failures; } | |
| 2873 | |
|
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|
2874 template <class T> void do_oop_nv(T* p) { |
|
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|
2875 T heap_oop = oopDesc::load_heap_oop(p); |
|
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|
2876 if (!oopDesc::is_null(heap_oop)) { |
|
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|
2877 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
|
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|
2878 if (_g1h->is_obj_dead_cond(obj, _vo)) { |
| 342 | 2879 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
|
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|
2880 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
|
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|
2881 if (_vo == VerifyOption_G1UseMarkWord) { |
|
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|
2882 gclog_or_tty->print_cr(" Mark word: "PTR_FORMAT, (void*)(obj->mark())); |
|
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|
2883 } |
| 342 | 2884 obj->print_on(gclog_or_tty); |
| 2885 _failures = true; | |
| 2886 } | |
| 2887 } | |
| 2888 } | |
|
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|
2889 |
|
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|
2890 void do_oop(oop* p) { do_oop_nv(p); } |
|
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|
2891 void do_oop(narrowOop* p) { do_oop_nv(p); } |
| 342 | 2892 }; |
| 2893 | |
| 390 | 2894 // This is the task used for parallel heap verification. |
| 2895 | |
| 2896 class G1ParVerifyTask: public AbstractGangTask { | |
| 2897 private: | |
| 2898 G1CollectedHeap* _g1h; | |
|
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|
2899 bool _allow_dirty; |
|
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|
2900 VerifyOption _vo; |
|
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changeset
|
2901 bool _failures; |
| 390 | 2902 |
| 2903 public: | |
|
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|
2904 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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|
2905 // _vo == UseNextMarking -> use "next" marking information, |
|
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|
2906 // _vo == UseMarkWord -> use mark word from object header. |
|
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|
2907 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, VerifyOption vo) : |
| 390 | 2908 AbstractGangTask("Parallel verify task"), |
|
845
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|
2909 _g1h(g1h), |
|
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|
2910 _allow_dirty(allow_dirty), |
|
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|
2911 _vo(vo), |
|
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|
2912 _failures(false) { } |
|
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|
2913 |
|
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|
2914 bool failures() { |
|
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|
2915 return _failures; |
|
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|
2916 } |
| 390 | 2917 |
| 2918 void work(int worker_i) { | |
|
637
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|
2919 HandleMark hm; |
|
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|
2920 VerifyRegionClosure blk(_allow_dirty, true, _vo); |
| 390 | 2921 _g1h->heap_region_par_iterate_chunked(&blk, worker_i, |
| 2922 HeapRegion::ParVerifyClaimValue); | |
|
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|
2923 if (blk.failures()) { |
|
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|
2924 _failures = true; |
|
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|
2925 } |
| 390 | 2926 } |
| 2927 }; | |
| 2928 | |
| 342 | 2929 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
|
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|
2930 verify(allow_dirty, silent, VerifyOption_G1UsePrevMarking); |
| 811 | 2931 } |
| 2932 | |
| 2933 void G1CollectedHeap::verify(bool allow_dirty, | |
| 2934 bool silent, | |
|
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|
2935 VerifyOption vo) { |
| 342 | 2936 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
|
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|
2937 if (!silent) { gclog_or_tty->print("Roots (excluding permgen) "); } |
|
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|
2938 VerifyRootsClosure rootsCl(vo); |
|
989
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|
2939 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
|
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|
2940 |
|
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|
2941 // We apply the relevant closures to all the oops in the |
|
1f4413413144
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|
2942 // system dictionary, the string table and the code cache. |
|
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|
2943 const int so = SharedHeap::SO_AllClasses | SharedHeap::SO_Strings | SharedHeap::SO_CodeCache; |
|
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|
2944 |
|
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|
2945 process_strong_roots(true, // activate StrongRootsScope |
|
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|
2946 true, // we set "collecting perm gen" to true, |
|
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|
2947 // so we don't reset the dirty cards in the perm gen. |
|
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|
2948 SharedHeap::ScanningOption(so), // roots scanning options |
| 342 | 2949 &rootsCl, |
|
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|
2950 &blobsCl, |
| 342 | 2951 &rootsCl); |
|
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|
2952 |
|
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|
2953 // If we're verifying after the marking phase of a Full GC then we can't |
|
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|
2954 // treat the perm gen as roots into the G1 heap. Some of the objects in |
|
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|
2955 // the perm gen may be dead and hence not marked. If one of these dead |
|
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|
2956 // objects is considered to be a root then we may end up with a false |
|
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|
2957 // "Root location <x> points to dead ob <y>" failure. |
|
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|
2958 if (vo != VerifyOption_G1UseMarkWord) { |
|
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|
2959 // Since we used "collecting_perm_gen" == true above, we will not have |
|
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|
2960 // checked the refs from perm into the G1-collected heap. We check those |
|
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|
2961 // references explicitly below. Whether the relevant cards are dirty |
|
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|
2962 // is checked further below in the rem set verification. |
|
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changeset
|
2963 if (!silent) { gclog_or_tty->print("Permgen roots "); } |
|
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|
2964 perm_gen()->oop_iterate(&rootsCl); |
|
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|
2965 } |
|
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|
2966 bool failures = rootsCl.failures(); |
|
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|
2967 |
|
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|
2968 if (vo != VerifyOption_G1UseMarkWord) { |
|
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changeset
|
2969 // If we're verifying during a full GC then the region sets |
|
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changeset
|
2970 // will have been torn down at the start of the GC. Therefore |
|
6747fd0512e0
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|
2971 // verifying the region sets will fail. So we only verify |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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|
2972 // the region sets when not in a full GC. |
|
6747fd0512e0
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changeset
|
2973 if (!silent) { gclog_or_tty->print("HeapRegionSets "); } |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
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|
2974 verify_region_sets(); |
|
6747fd0512e0
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parents:
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|
2975 } |
|
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|
2976 |
| 2152 | 2977 if (!silent) { gclog_or_tty->print("HeapRegions "); } |
| 390 | 2978 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
| 2979 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2980 "sanity check"); | |
| 2981 | |
|
3772
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|
2982 G1ParVerifyTask task(this, allow_dirty, vo); |
| 390 | 2983 int n_workers = workers()->total_workers(); |
| 2984 set_par_threads(n_workers); | |
| 2985 workers()->run_task(&task); | |
| 2986 set_par_threads(0); | |
|
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|
2987 if (task.failures()) { |
|
ff2402f6a50b
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|
2988 failures = true; |
|
ff2402f6a50b
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|
2989 } |
| 390 | 2990 |
| 2991 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), | |
| 2992 "sanity check"); | |
| 2993 | |
| 2994 reset_heap_region_claim_values(); | |
| 2995 | |
| 2996 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2997 "sanity check"); | |
| 2998 } else { | |
|
3772
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|
2999 VerifyRegionClosure blk(allow_dirty, false, vo); |
| 3766 | 3000 heap_region_iterate(&blk); |
|
1020
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|
3001 if (blk.failures()) { |
|
ff2402f6a50b
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|
3002 failures = true; |
|
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|
3003 } |
| 390 | 3004 } |
| 2152 | 3005 if (!silent) gclog_or_tty->print("RemSet "); |
| 342 | 3006 rem_set()->verify(); |
|
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|
3007 |
|
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|
3008 if (failures) { |
|
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|
3009 gclog_or_tty->print_cr("Heap:"); |
|
ff2402f6a50b
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|
3010 print_on(gclog_or_tty, true /* extended */); |
|
ff2402f6a50b
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|
3011 gclog_or_tty->print_cr(""); |
|
1547
fb1a39993f69
6951319: enable solaris builds using Sun Studio 12 update 1
jcoomes
parents:
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diff
changeset
|
3012 #ifndef PRODUCT |
| 1044 | 3013 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
| 1388 | 3014 concurrent_mark()->print_reachable("at-verification-failure", |
|
3772
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|
3015 vo, false /* all */); |
|
1020
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|
3016 } |
|
1547
fb1a39993f69
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jcoomes
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|
3017 #endif |
|
1020
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|
3018 gclog_or_tty->flush(); |
|
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|
3019 } |
|
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|
3020 guarantee(!failures, "there should not have been any failures"); |
| 342 | 3021 } else { |
| 3022 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
| 3023 } | |
| 3024 } | |
| 3025 | |
| 3026 class PrintRegionClosure: public HeapRegionClosure { | |
| 3027 outputStream* _st; | |
| 3028 public: | |
| 3029 PrintRegionClosure(outputStream* st) : _st(st) {} | |
| 3030 bool doHeapRegion(HeapRegion* r) { | |
| 3031 r->print_on(_st); | |
| 3032 return false; | |
| 3033 } | |
| 3034 }; | |
| 3035 | |
|
838
0316eac49d5a
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|
3036 void G1CollectedHeap::print() const { print_on(tty); } |
| 342 | 3037 |
| 3038 void G1CollectedHeap::print_on(outputStream* st) const { | |
|
838
0316eac49d5a
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|
3039 print_on(st, PrintHeapAtGCExtended); |
|
0316eac49d5a
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|
3040 } |
|
0316eac49d5a
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|
3041 |
|
0316eac49d5a
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|
3042 void G1CollectedHeap::print_on(outputStream* st, bool extended) const { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
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|
3043 st->print(" %-20s", "garbage-first heap"); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
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|
3044 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
|
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
3045 capacity()/K, used_unlocked()/K); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
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|
3046 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
|
0316eac49d5a
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|
3047 _g1_storage.low_boundary(), |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3048 _g1_storage.high(), |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3049 _g1_storage.high_boundary()); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
3050 st->cr(); |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3983
diff
changeset
|
3051 st->print(" region size " SIZE_FORMAT "K, ", HeapRegion::GrainBytes / K); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3052 size_t young_regions = _young_list->length(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
3053 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
3054 young_regions, young_regions * HeapRegion::GrainBytes / K); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3055 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
3056 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
3057 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
3058 st->cr(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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changeset
|
3059 perm()->as_gen()->print_on(st); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3060 if (extended) { |
|
1020
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6882730: G1: parallel heap verification messes up region dump
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parents:
1019
diff
changeset
|
3061 st->cr(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
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|
3062 print_on_extended(st); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
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|
3063 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3064 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
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changeset
|
3065 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3066 void G1CollectedHeap::print_on_extended(outputStream* st) const { |
| 342 | 3067 PrintRegionClosure blk(st); |
| 3766 | 3068 heap_region_iterate(&blk); |
| 342 | 3069 } |
| 3070 | |
| 3071 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
3072 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 1019 | 3073 workers()->print_worker_threads_on(st); |
| 3074 } | |
| 3075 _cmThread->print_on(st); | |
| 342 | 3076 st->cr(); |
| 1019 | 3077 _cm->print_worker_threads_on(st); |
| 3078 _cg1r->print_worker_threads_on(st); | |
| 342 | 3079 st->cr(); |
| 3080 } | |
| 3081 | |
| 3082 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
3083 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3084 workers()->threads_do(tc); |
| 3085 } | |
| 3086 tc->do_thread(_cmThread); | |
| 794 | 3087 _cg1r->threads_do(tc); |
| 342 | 3088 } |
| 3089 | |
| 3090 void G1CollectedHeap::print_tracing_info() const { | |
| 3091 // We'll overload this to mean "trace GC pause statistics." | |
| 3092 if (TraceGen0Time || TraceGen1Time) { | |
| 3093 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
| 3094 // to that. | |
| 3095 g1_policy()->print_tracing_info(); | |
| 3096 } | |
| 751 | 3097 if (G1SummarizeRSetStats) { |
| 342 | 3098 g1_rem_set()->print_summary_info(); |
| 3099 } | |
| 1282 | 3100 if (G1SummarizeConcMark) { |
| 342 | 3101 concurrent_mark()->print_summary_info(); |
| 3102 } | |
| 3103 g1_policy()->print_yg_surv_rate_info(); | |
| 3104 SpecializationStats::print(); | |
| 3105 } | |
| 3106 | |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3107 #ifndef PRODUCT |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3108 // Helpful for debugging RSet issues. |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3109 |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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3774
diff
changeset
|
3110 class PrintRSetsClosure : public HeapRegionClosure { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3111 private: |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3112 const char* _msg; |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3113 size_t _occupied_sum; |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3114 |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3115 public: |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3116 bool doHeapRegion(HeapRegion* r) { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3117 HeapRegionRemSet* hrrs = r->rem_set(); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3118 size_t occupied = hrrs->occupied(); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3119 _occupied_sum += occupied; |
|
e8b0b0392037
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tonyp
parents:
3774
diff
changeset
|
3120 |
|
e8b0b0392037
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tonyp
parents:
3774
diff
changeset
|
3121 gclog_or_tty->print_cr("Printing RSet for region "HR_FORMAT, |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3122 HR_FORMAT_PARAMS(r)); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3123 if (occupied == 0) { |
|
e8b0b0392037
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tonyp
parents:
3774
diff
changeset
|
3124 gclog_or_tty->print_cr(" RSet is empty"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3125 } else { |
|
e8b0b0392037
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tonyp
parents:
3774
diff
changeset
|
3126 hrrs->print(); |
|
e8b0b0392037
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tonyp
parents:
3774
diff
changeset
|
3127 } |
|
e8b0b0392037
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parents:
3774
diff
changeset
|
3128 gclog_or_tty->print_cr("----------"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3129 return false; |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3130 } |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
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diff
changeset
|
3131 |
|
e8b0b0392037
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3774
diff
changeset
|
3132 PrintRSetsClosure(const char* msg) : _msg(msg), _occupied_sum(0) { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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3774
diff
changeset
|
3133 gclog_or_tty->cr(); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
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3774
diff
changeset
|
3134 gclog_or_tty->print_cr("========================================"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
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3774
diff
changeset
|
3135 gclog_or_tty->print_cr(msg); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3136 gclog_or_tty->cr(); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3137 } |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3138 |
|
e8b0b0392037
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3774
diff
changeset
|
3139 ~PrintRSetsClosure() { |
|
e8b0b0392037
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tonyp
parents:
3774
diff
changeset
|
3140 gclog_or_tty->print_cr("Occupied Sum: "SIZE_FORMAT, _occupied_sum); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3141 gclog_or_tty->print_cr("========================================"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
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3774
diff
changeset
|
3142 gclog_or_tty->cr(); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3143 } |
|
e8b0b0392037
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tonyp
parents:
3774
diff
changeset
|
3144 }; |
|
e8b0b0392037
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parents:
3774
diff
changeset
|
3145 |
|
e8b0b0392037
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diff
changeset
|
3146 void G1CollectedHeap::print_cset_rsets() { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3147 PrintRSetsClosure cl("Printing CSet RSets"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3148 collection_set_iterate(&cl); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3149 } |
|
e8b0b0392037
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changeset
|
3150 |
|
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3151 void G1CollectedHeap::print_all_rsets() { |
|
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|
3152 PrintRSetsClosure cl("Printing All RSets");; |
|
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|
3153 heap_region_iterate(&cl); |
|
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|
3154 } |
|
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|
3155 #endif // PRODUCT |
|
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|
3156 |
| 342 | 3157 G1CollectedHeap* G1CollectedHeap::heap() { |
| 3158 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
| 3159 "not a garbage-first heap"); | |
| 3160 return _g1h; | |
| 3161 } | |
| 3162 | |
| 3163 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
|
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|
3164 // always_do_update_barrier = false; |
| 342 | 3165 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
| 3166 // Call allocation profiler | |
| 3167 AllocationProfiler::iterate_since_last_gc(); | |
| 3168 // Fill TLAB's and such | |
| 3169 ensure_parsability(true); | |
| 3170 } | |
| 3171 | |
| 3172 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
| 3173 // FIXME: what is this about? | |
| 3174 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
| 3175 // is set. | |
| 3176 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
| 3177 "derived pointer present")); | |
|
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|
3178 // always_do_update_barrier = true; |
|
3979
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|
3179 |
|
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|
3180 // We have just completed a GC. Update the soft reference |
|
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|
3181 // policy with the new heap occupancy |
|
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|
3182 Universe::update_heap_info_at_gc(); |
| 342 | 3183 } |
| 3184 | |
| 1973 | 3185 HeapWord* G1CollectedHeap::do_collection_pause(size_t word_size, |
| 3186 unsigned int gc_count_before, | |
| 3187 bool* succeeded) { | |
| 3188 assert_heap_not_locked_and_not_at_safepoint(); | |
| 342 | 3189 g1_policy()->record_stop_world_start(); |
| 1973 | 3190 VM_G1IncCollectionPause op(gc_count_before, |
| 3191 word_size, | |
| 3192 false, /* should_initiate_conc_mark */ | |
| 3193 g1_policy()->max_pause_time_ms(), | |
| 3194 GCCause::_g1_inc_collection_pause); | |
| 3195 VMThread::execute(&op); | |
| 3196 | |
| 3197 HeapWord* result = op.result(); | |
| 3198 bool ret_succeeded = op.prologue_succeeded() && op.pause_succeeded(); | |
| 3199 assert(result == NULL || ret_succeeded, | |
| 3200 "the result should be NULL if the VM did not succeed"); | |
| 3201 *succeeded = ret_succeeded; | |
| 3202 | |
| 3203 assert_heap_not_locked(); | |
| 3204 return result; | |
| 342 | 3205 } |
| 3206 | |
| 3207 void | |
| 3208 G1CollectedHeap::doConcurrentMark() { | |
|
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3209 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
|
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|
3210 if (!_cmThread->in_progress()) { |
|
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|
3211 _cmThread->set_started(); |
|
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|
3212 CGC_lock->notify(); |
| 342 | 3213 } |
| 3214 } | |
| 3215 | |
| 3216 // <NEW PREDICTION> | |
| 3217 | |
| 3218 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
| 3219 bool young) { | |
| 3220 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
| 3221 } | |
| 3222 | |
| 3223 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
| 3224 predicted_time_ms) { | |
| 3225 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
| 3226 } | |
| 3227 | |
| 3228 size_t G1CollectedHeap::pending_card_num() { | |
| 3229 size_t extra_cards = 0; | |
| 3230 JavaThread *curr = Threads::first(); | |
| 3231 while (curr != NULL) { | |
| 3232 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
| 3233 extra_cards += dcq.size(); | |
| 3234 curr = curr->next(); | |
| 3235 } | |
| 3236 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 3237 size_t buffer_size = dcqs.buffer_size(); | |
| 3238 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 3239 return buffer_size * buffer_num + extra_cards; | |
| 3240 } | |
| 3241 | |
| 3242 size_t G1CollectedHeap::max_pending_card_num() { | |
| 3243 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 3244 size_t buffer_size = dcqs.buffer_size(); | |
| 3245 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 3246 int thread_num = Threads::number_of_threads(); | |
| 3247 return (buffer_num + thread_num) * buffer_size; | |
| 3248 } | |
| 3249 | |
| 3250 size_t G1CollectedHeap::cards_scanned() { | |
| 1861 | 3251 return g1_rem_set()->cardsScanned(); |
| 342 | 3252 } |
| 3253 | |
| 3254 void | |
| 3255 G1CollectedHeap::setup_surviving_young_words() { | |
| 3256 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
| 3257 size_t array_length = g1_policy()->young_cset_length(); | |
| 3258 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); | |
| 3259 if (_surviving_young_words == NULL) { | |
| 3260 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
| 3261 "Not enough space for young surv words summary."); | |
| 3262 } | |
| 3263 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
|
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|
3264 #ifdef ASSERT |
| 342 | 3265 for (size_t i = 0; i < array_length; ++i) { |
|
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|
3266 assert( _surviving_young_words[i] == 0, "memset above" ); |
|
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|
3267 } |
|
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|
3268 #endif // !ASSERT |
| 342 | 3269 } |
| 3270 | |
| 3271 void | |
| 3272 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
| 3273 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 3274 size_t array_length = g1_policy()->young_cset_length(); | |
| 3275 for (size_t i = 0; i < array_length; ++i) | |
| 3276 _surviving_young_words[i] += surv_young_words[i]; | |
| 3277 } | |
| 3278 | |
| 3279 void | |
| 3280 G1CollectedHeap::cleanup_surviving_young_words() { | |
| 3281 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
| 3282 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
| 3283 _surviving_young_words = NULL; | |
| 3284 } | |
| 3285 | |
| 3286 // </NEW PREDICTION> | |
| 3287 | |
|
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|
3288 #ifdef ASSERT |
|
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|
3289 class VerifyCSetClosure: public HeapRegionClosure { |
|
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|
3290 public: |
|
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|
3291 bool doHeapRegion(HeapRegion* hr) { |
|
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|
3292 // Here we check that the CSet region's RSet is ready for parallel |
|
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|
3293 // iteration. The fields that we'll verify are only manipulated |
|
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|
3294 // when the region is part of a CSet and is collected. Afterwards, |
|
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|
3295 // we reset these fields when we clear the region's RSet (when the |
|
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changeset
|
3296 // region is freed) so they are ready when the region is |
|
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|
3297 // re-allocated. The only exception to this is if there's an |
|
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|
3298 // evacuation failure and instead of freeing the region we leave |
|
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|
3299 // it in the heap. In that case, we reset these fields during |
|
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|
3300 // evacuation failure handling. |
|
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|
3301 guarantee(hr->rem_set()->verify_ready_for_par_iteration(), "verification"); |
|
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|
3302 |
|
e8b0b0392037
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changeset
|
3303 // Here's a good place to add any other checks we'd like to |
|
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changeset
|
3304 // perform on CSet regions. |
|
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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diff
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|
3305 return false; |
|
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
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diff
changeset
|
3306 } |
|
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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diff
changeset
|
3307 }; |
|
3777
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|
3308 #endif // ASSERT |
|
1261
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|
3309 |
| 1709 | 3310 #if TASKQUEUE_STATS |
| 3311 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
| 3312 st->print_raw_cr("GC Task Stats"); | |
| 3313 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
| 3314 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
| 3315 } | |
| 3316 | |
| 3317 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
| 3318 print_taskqueue_stats_hdr(st); | |
| 3319 | |
| 3320 TaskQueueStats totals; | |
|
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3321 const int n = workers() != NULL ? workers()->total_workers() : 1; |
| 1709 | 3322 for (int i = 0; i < n; ++i) { |
| 3323 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
| 3324 totals += task_queue(i)->stats; | |
| 3325 } | |
| 3326 st->print_raw("tot "); totals.print(st); st->cr(); | |
| 3327 | |
| 3328 DEBUG_ONLY(totals.verify()); | |
| 3329 } | |
| 3330 | |
| 3331 void G1CollectedHeap::reset_taskqueue_stats() { | |
|
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
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1719
diff
changeset
|
3332 const int n = workers() != NULL ? workers()->total_workers() : 1; |
| 1709 | 3333 for (int i = 0; i < n; ++i) { |
| 3334 task_queue(i)->stats.reset(); | |
| 3335 } | |
| 3336 } | |
| 3337 #endif // TASKQUEUE_STATS | |
| 3338 | |
| 1973 | 3339 bool |
|
1656
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6944166: G1: explicit GCs are not always handled correctly
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changeset
|
3340 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
| 2152 | 3341 assert_at_safepoint(true /* should_be_vm_thread */); |
| 3342 guarantee(!is_gc_active(), "collection is not reentrant"); | |
| 3343 | |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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diff
changeset
|
3344 if (GC_locker::check_active_before_gc()) { |
| 1973 | 3345 return false; |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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changeset
|
3346 } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3347 |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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2039
diff
changeset
|
3348 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
|
2039
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
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diff
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|
3349 ResourceMark rm; |
|
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
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|
3350 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3351 if (PrintHeapAtGC) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3352 Universe::print_heap_before_gc(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3353 } |
|
0316eac49d5a
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|
3354 |
| 2152 | 3355 verify_region_sets_optional(); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
changeset
|
3356 verify_dirty_young_regions(); |
| 2152 | 3357 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3358 { |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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changeset
|
3359 // This call will decide whether this pause is an initial-mark |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3360 // pause. If it is, during_initial_mark_pause() will return true |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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changeset
|
3361 // for the duration of this pause. |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3362 g1_policy()->decide_on_conc_mark_initiation(); |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
3363 |
|
3982
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
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diff
changeset
|
3364 // We do not allow initial-mark to be piggy-backed on a |
|
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
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changeset
|
3365 // partially-young GC. |
|
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
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changeset
|
3366 assert(!g1_policy()->during_initial_mark_pause() || |
|
273b46400613
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|
3367 g1_policy()->full_young_gcs(), "sanity"); |
|
273b46400613
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|
3368 |
|
273b46400613
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diff
changeset
|
3369 // We also do not allow partially-young GCs during marking. |
|
273b46400613
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diff
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|
3370 assert(!mark_in_progress() || g1_policy()->full_young_gcs(), "sanity"); |
|
273b46400613
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|
3371 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3372 char verbose_str[128]; |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3373 sprintf(verbose_str, "GC pause "); |
|
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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3830
diff
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|
3374 if (g1_policy()->full_young_gcs()) { |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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3830
diff
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|
3375 strcat(verbose_str, "(young)"); |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
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diff
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|
3376 } else { |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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3830
diff
changeset
|
3377 strcat(verbose_str, "(partial)"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3378 } |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3379 if (g1_policy()->during_initial_mark_pause()) { |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3380 strcat(verbose_str, " (initial-mark)"); |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3381 // We are about to start a marking cycle, so we increment the |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3382 // full collection counter. |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3383 increment_total_full_collections(); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3384 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3385 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3386 // if PrintGCDetails is on, we'll print long statistics information |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3387 // in the collector policy code, so let's not print this as the output |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3388 // is messy if we do. |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3389 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3390 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3391 TraceTime t(verbose_str, PrintGC && !PrintGCDetails, true, gclog_or_tty); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3392 |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3393 TraceCollectorStats tcs(g1mm()->incremental_collection_counters()); |
|
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
3394 TraceMemoryManagerStats tms(false /* fullGC */, gc_cause()); |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3395 |
| 2361 | 3396 // If the secondary_free_list is not empty, append it to the |
| 3397 // free_list. No need to wait for the cleanup operation to finish; | |
| 3398 // the region allocation code will check the secondary_free_list | |
| 3399 // and wait if necessary. If the G1StressConcRegionFreeing flag is | |
| 3400 // set, skip this step so that the region allocation code has to | |
| 3401 // get entries from the secondary_free_list. | |
| 2152 | 3402 if (!G1StressConcRegionFreeing) { |
| 2361 | 3403 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 3404 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3405 |
|
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3406 assert(check_young_list_well_formed(), |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3407 "young list should be well formed"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3408 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3409 { // Call to jvmpi::post_class_unload_events must occur outside of active GC |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3410 IsGCActiveMark x; |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3411 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3412 gc_prologue(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3413 increment_total_collections(false /* full gc */); |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3414 increment_gc_time_stamp(); |
| 342 | 3415 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3416 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3417 HandleMark hm; // Discard invalid handles created during verification |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3418 gclog_or_tty->print(" VerifyBeforeGC:"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3419 prepare_for_verify(); |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3420 Universe::verify(/* allow dirty */ false, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3421 /* silent */ false, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3422 /* option */ VerifyOption_G1UsePrevMarking); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3423 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3424 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3425 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3426 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3427 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3428 // Please see comment in g1CollectedHeap.hpp and |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3429 // G1CollectedHeap::ref_processing_init() to see how |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3430 // reference processing currently works in G1. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3431 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3432 // Enable discovery in the STW reference processor |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3433 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3434 true /*verify_no_refs*/); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3435 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3436 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3437 // We want to temporarily turn off discovery by the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3438 // CM ref processor, if necessary, and turn it back on |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3439 // on again later if we do. Using a scoped |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3440 // NoRefDiscovery object will do this. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3441 NoRefDiscovery no_cm_discovery(ref_processor_cm()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3442 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3443 // Forget the current alloc region (we might even choose it to be part |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3444 // of the collection set!). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3445 release_mutator_alloc_region(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3446 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3447 // We should call this after we retire the mutator alloc |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3448 // region(s) so that all the ALLOC / RETIRE events are generated |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3449 // before the start GC event. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3450 _hr_printer.start_gc(false /* full */, (size_t) total_collections()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3451 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3452 // The elapsed time induced by the start time below deliberately elides |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3453 // the possible verification above. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3454 double start_time_sec = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3455 size_t start_used_bytes = used(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3456 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3457 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3458 gclog_or_tty->print_cr("\nBefore recording pause start.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3459 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3460 g1_policy()->print_collection_set(g1_policy()->inc_cset_head(), gclog_or_tty); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3461 #endif // YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3462 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3463 g1_policy()->record_collection_pause_start(start_time_sec, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3464 start_used_bytes); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3465 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3466 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3467 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3468 _young_list->print(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3469 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3470 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3471 if (g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3472 concurrent_mark()->checkpointRootsInitialPre(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3473 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3474 perm_gen()->save_marks(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3475 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3476 // We must do this before any possible evacuation that should propagate |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3477 // marks. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3478 if (mark_in_progress()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3479 double start_time_sec = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3480 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3481 _cm->drainAllSATBBuffers(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3482 double finish_mark_ms = (os::elapsedTime() - start_time_sec) * 1000.0; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3483 g1_policy()->record_satb_drain_time(finish_mark_ms); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3484 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3485 // Record the number of elements currently on the mark stack, so we |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3486 // only iterate over these. (Since evacuation may add to the mark |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3487 // stack, doing more exposes race conditions.) If no mark is in |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3488 // progress, this will be zero. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3489 _cm->set_oops_do_bound(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3490 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3491 if (mark_in_progress()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3492 concurrent_mark()->newCSet(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3493 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3494 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3495 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3496 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3497 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3498 g1_policy()->print_collection_set(g1_policy()->inc_cset_head(), gclog_or_tty); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3499 #endif // YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3500 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3501 g1_policy()->choose_collection_set(target_pause_time_ms); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3502 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3503 if (_hr_printer.is_active()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3504 HeapRegion* hr = g1_policy()->collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3505 while (hr != NULL) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3506 G1HRPrinter::RegionType type; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3507 if (!hr->is_young()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3508 type = G1HRPrinter::Old; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3509 } else if (hr->is_survivor()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3510 type = G1HRPrinter::Survivor; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3511 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3512 type = G1HRPrinter::Eden; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3513 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3514 _hr_printer.cset(hr); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3515 hr = hr->next_in_collection_set(); |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3516 } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3517 } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3518 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3519 // We have chosen the complete collection set. If marking is |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3520 // active then, we clear the region fields of any of the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3521 // concurrent marking tasks whose region fields point into |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3522 // the collection set as these values will become stale. This |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3523 // will cause the owning marking threads to claim a new region |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3524 // when marking restarts. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3525 if (mark_in_progress()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3526 concurrent_mark()->reset_active_task_region_fields_in_cset(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3527 } |
|
3378
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3528 |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3529 #ifdef ASSERT |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3530 VerifyCSetClosure cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3531 collection_set_iterate(&cl); |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3532 #endif // ASSERT |
| 1707 | 3533 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3534 setup_surviving_young_words(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3535 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3536 // Initialize the GC alloc regions. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3537 init_gc_alloc_regions(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3538 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3539 // Actually do the work... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3540 evacuate_collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3541 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3542 free_collection_set(g1_policy()->collection_set()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3543 g1_policy()->clear_collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3544 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3545 cleanup_surviving_young_words(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3546 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3547 // Start a new incremental collection set for the next pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3548 g1_policy()->start_incremental_cset_building(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3549 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3550 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3551 // regions to the incremental collection set for the next |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3552 // evacuation pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3553 clear_cset_fast_test(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3554 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3555 _young_list->reset_sampled_info(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3556 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3557 // Don't check the whole heap at this point as the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3558 // GC alloc regions from this pause have been tagged |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3559 // as survivors and moved on to the survivor list. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3560 // Survivor regions will fail the !is_young() check. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3561 assert(check_young_list_empty(false /* check_heap */), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3562 "young list should be empty"); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3563 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3564 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3565 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3566 _young_list->print(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3567 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3568 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3569 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3570 _young_list->first_survivor_region(), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3571 _young_list->last_survivor_region()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3572 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3573 _young_list->reset_auxilary_lists(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3574 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3575 if (evacuation_failed()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3576 _summary_bytes_used = recalculate_used(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3577 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3578 // The "used" of the the collection set have already been subtracted |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3579 // when they were freed. Add in the bytes evacuated. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3580 _summary_bytes_used += g1_policy()->bytes_copied_during_gc(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3581 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3582 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3583 if (g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3584 concurrent_mark()->checkpointRootsInitialPost(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3585 set_marking_started(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3586 // CAUTION: after the doConcurrentMark() call below, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3587 // the concurrent marking thread(s) could be running |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3588 // concurrently with us. Make sure that anything after |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3589 // this point does not assume that we are the only GC thread |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3590 // running. Note: of course, the actual marking work will |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3591 // not start until the safepoint itself is released in |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3592 // ConcurrentGCThread::safepoint_desynchronize(). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3593 doConcurrentMark(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3594 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3595 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3596 allocate_dummy_regions(); |
|
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
3597 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3598 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3599 gclog_or_tty->print_cr("\nEnd of the pause.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3600 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3601 g1_policy()->print_collection_set(g1_policy()->inc_cset_head(), gclog_or_tty); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3602 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3603 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3604 init_mutator_alloc_region(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3605 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3606 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3607 size_t expand_bytes = g1_policy()->expansion_amount(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3608 if (expand_bytes > 0) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3609 size_t bytes_before = capacity(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3610 if (!expand(expand_bytes)) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3611 // We failed to expand the heap so let's verify that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3612 // committed/uncommitted amount match the backing store |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3613 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3614 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3615 } |
|
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3616 } |
|
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3617 } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3618 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3619 double end_time_sec = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3620 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3621 g1_policy()->record_pause_time_ms(pause_time_ms); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3622 g1_policy()->record_collection_pause_end(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3623 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3624 MemoryService::track_memory_usage(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3625 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3626 // In prepare_for_verify() below we'll need to scan the deferred |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3627 // update buffers to bring the RSets up-to-date if |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3628 // G1HRRSFlushLogBuffersOnVerify has been set. While scanning |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3629 // the update buffers we'll probably need to scan cards on the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3630 // regions we just allocated to (i.e., the GC alloc |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3631 // regions). However, during the last GC we called |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3632 // set_saved_mark() on all the GC alloc regions, so card |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3633 // scanning might skip the [saved_mark_word()...top()] area of |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3634 // those regions (i.e., the area we allocated objects into |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3635 // during the last GC). But it shouldn't. Given that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3636 // saved_mark_word() is conditional on whether the GC time stamp |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3637 // on the region is current or not, by incrementing the GC time |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3638 // stamp here we invalidate all the GC time stamps on all the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3639 // regions and saved_mark_word() will simply return top() for |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3640 // all the regions. This is a nicer way of ensuring this rather |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3641 // than iterating over the regions and fixing them. In fact, the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3642 // GC time stamp increment here also ensures that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3643 // saved_mark_word() will return top() between pauses, i.e., |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3644 // during concurrent refinement. So we don't need the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3645 // is_gc_active() check to decided which top to use when |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3646 // scanning cards (see CR 7039627). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3647 increment_gc_time_stamp(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3648 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3649 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3650 HandleMark hm; // Discard invalid handles created during verification |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3651 gclog_or_tty->print(" VerifyAfterGC:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3652 prepare_for_verify(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3653 Universe::verify(/* allow dirty */ true, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3654 /* silent */ false, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3655 /* option */ VerifyOption_G1UsePrevMarking); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3656 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3657 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3658 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3659 ref_processor_stw()->verify_no_references_recorded(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3660 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3661 // CM reference discovery will be re-enabled if necessary. |
|
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3662 } |
|
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3663 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3664 { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3665 size_t expand_bytes = g1_policy()->expansion_amount(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3666 if (expand_bytes > 0) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3667 size_t bytes_before = capacity(); |
|
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3886
diff
changeset
|
3668 // No need for an ergo verbose message here, |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3886
diff
changeset
|
3669 // expansion_amount() does this when it returns a value > 0. |
|
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3670 if (!expand(expand_bytes)) { |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3671 // We failed to expand the heap so let's verify that |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3672 // committed/uncommitted amount match the backing store |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3673 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3674 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3675 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3676 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3677 } |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3678 |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3679 // We should do this after we potentially expand the heap so |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3680 // that all the COMMIT events are generated before the end GC |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3681 // event, and after we retire the GC alloc regions so that all |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3682 // RETIRE events are generated before the end GC event. |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3683 _hr_printer.end_gc(false /* full */, (size_t) total_collections()); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3684 |
|
3764
053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
tonyp
parents:
3378
diff
changeset
|
3685 // We have to do this after we decide whether to expand the heap or not. |
|
053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
tonyp
parents:
3378
diff
changeset
|
3686 g1_policy()->print_heap_transition(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3687 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3688 if (mark_in_progress()) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3689 concurrent_mark()->update_g1_committed(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3690 } |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3691 |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3692 #ifdef TRACESPINNING |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3693 ParallelTaskTerminator::print_termination_counts(); |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3694 #endif |
| 342 | 3695 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3696 gc_epilogue(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3697 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3698 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3699 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3700 gclog_or_tty->print_cr("Stopping after GC #%d", ExitAfterGCNum); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3701 print_tracing_info(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3702 vm_exit(-1); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3703 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3704 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3705 |
| 3766 | 3706 _hrs.verify_optional(); |
| 2152 | 3707 verify_region_sets_optional(); |
| 3708 | |
| 1709 | 3709 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
| 3710 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); | |
| 3711 | |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3712 if (PrintHeapAtGC) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3713 Universe::print_heap_after_gc(); |
| 342 | 3714 } |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
3715 g1mm()->update_sizes(); |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3716 |
|
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3717 if (G1SummarizeRSetStats && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3718 (G1SummarizeRSetStatsPeriod > 0) && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3719 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3720 g1_rem_set()->print_summary_info(); |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3721 } |
| 1973 | 3722 |
| 3723 return true; | |
| 342 | 3724 } |
| 3725 | |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3726 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3727 { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3728 size_t gclab_word_size; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3729 switch (purpose) { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3730 case GCAllocForSurvived: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3731 gclab_word_size = YoungPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3732 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3733 case GCAllocForTenured: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3734 gclab_word_size = OldPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3735 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3736 default: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3737 assert(false, "unknown GCAllocPurpose"); |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3738 gclab_word_size = OldPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3739 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3740 } |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3741 return gclab_word_size; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3742 } |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3743 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3744 void G1CollectedHeap::init_mutator_alloc_region() { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3745 assert(_mutator_alloc_region.get() == NULL, "pre-condition"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3746 _mutator_alloc_region.init(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3747 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3748 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3749 void G1CollectedHeap::release_mutator_alloc_region() { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3750 _mutator_alloc_region.release(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3751 assert(_mutator_alloc_region.get() == NULL, "post-condition"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3752 } |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3753 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3754 void G1CollectedHeap::init_gc_alloc_regions() { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3755 assert_at_safepoint(true /* should_be_vm_thread */); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3756 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3757 _survivor_gc_alloc_region.init(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3758 _old_gc_alloc_region.init(); |
|
f44782f04dd4
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|
3759 HeapRegion* retained_region = _retained_old_gc_alloc_region; |
|
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|
3760 _retained_old_gc_alloc_region = NULL; |
|
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|
3761 |
|
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|
3762 // We will discard the current GC alloc region if: |
|
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|
3763 // a) it's in the collection set (it can happen!), |
|
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|
3764 // b) it's already full (no point in using it), |
|
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|
3765 // c) it's empty (this means that it was emptied during |
|
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|
3766 // a cleanup and it should be on the free list now), or |
|
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|
3767 // d) it's humongous (this means that it was emptied |
|
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|
3768 // during a cleanup and was added to the free list, but |
|
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|
3769 // has been subseqently used to allocate a humongous |
|
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|
3770 // object that may be less than the region size). |
|
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|
3771 if (retained_region != NULL && |
|
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|
3772 !retained_region->in_collection_set() && |
|
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|
3773 !(retained_region->top() == retained_region->end()) && |
|
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|
3774 !retained_region->is_empty() && |
|
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|
3775 !retained_region->isHumongous()) { |
|
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|
3776 retained_region->set_saved_mark(); |
|
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|
3777 _old_gc_alloc_region.set(retained_region); |
|
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|
3778 _hr_printer.reuse(retained_region); |
| 342 | 3779 } |
| 3780 } | |
| 3781 | |
|
3830
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|
3782 void G1CollectedHeap::release_gc_alloc_regions() { |
|
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|
3783 _survivor_gc_alloc_region.release(); |
|
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|
3784 // If we have an old GC alloc region to release, we'll save it in |
|
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|
3785 // _retained_old_gc_alloc_region. If we don't |
|
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|
3786 // _retained_old_gc_alloc_region will become NULL. This is what we |
|
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|
3787 // want either way so no reason to check explicitly for either |
|
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|
3788 // condition. |
|
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|
3789 _retained_old_gc_alloc_region = _old_gc_alloc_region.release(); |
| 342 | 3790 } |
| 3791 | |
|
3830
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|
3792 void G1CollectedHeap::abandon_gc_alloc_regions() { |
|
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|
3793 assert(_survivor_gc_alloc_region.get() == NULL, "pre-condition"); |
|
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|
3794 assert(_old_gc_alloc_region.get() == NULL, "pre-condition"); |
|
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|
3795 _retained_old_gc_alloc_region = NULL; |
| 342 | 3796 } |
| 3797 | |
| 3798 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
| 3799 _drain_in_progress = false; | |
| 3800 set_evac_failure_closure(cl); | |
| 3801 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 3802 } | |
| 3803 | |
| 3804 void G1CollectedHeap::finalize_for_evac_failure() { | |
| 3805 assert(_evac_failure_scan_stack != NULL && | |
| 3806 _evac_failure_scan_stack->length() == 0, | |
| 3807 "Postcondition"); | |
| 3808 assert(!_drain_in_progress, "Postcondition"); | |
| 1045 | 3809 delete _evac_failure_scan_stack; |
| 342 | 3810 _evac_failure_scan_stack = NULL; |
| 3811 } | |
| 3812 | |
|
616
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|
3813 class UpdateRSetDeferred : public OopsInHeapRegionClosure { |
|
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|
3814 private: |
|
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|
3815 G1CollectedHeap* _g1; |
|
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|
3816 DirtyCardQueue *_dcq; |
|
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|
3817 CardTableModRefBS* _ct_bs; |
|
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|
3818 |
|
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|
3819 public: |
|
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|
3820 UpdateRSetDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
|
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|
3821 _g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) {} |
|
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|
3822 |
|
845
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diff
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|
3823 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
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diff
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|
3824 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
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|
3825 template <class T> void do_oop_work(T* p) { |
|
616
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|
3826 assert(_from->is_in_reserved(p), "paranoia"); |
|
845
df6caf649ff7
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parents:
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diff
changeset
|
3827 if (!_from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && |
|
df6caf649ff7
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diff
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|
3828 !_from->is_survivor()) { |
|
616
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|
3829 size_t card_index = _ct_bs->index_for(p); |
|
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|
3830 if (_ct_bs->mark_card_deferred(card_index)) { |
|
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|
3831 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
|
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|
3832 } |
|
4f360ec815ba
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|
3833 } |
|
4f360ec815ba
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|
3834 } |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
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|
3835 }; |
|
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|
3836 |
| 342 | 3837 class RemoveSelfPointerClosure: public ObjectClosure { |
| 3838 private: | |
| 3839 G1CollectedHeap* _g1; | |
| 3840 ConcurrentMark* _cm; | |
| 3841 HeapRegion* _hr; | |
| 3842 size_t _prev_marked_bytes; | |
| 3843 size_t _next_marked_bytes; | |
|
616
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|
3844 OopsInHeapRegionClosure *_cl; |
| 342 | 3845 public: |
|
2133
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|
3846 RemoveSelfPointerClosure(G1CollectedHeap* g1, HeapRegion* hr, |
|
2250ee17e258
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|
3847 OopsInHeapRegionClosure* cl) : |
|
2250ee17e258
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2039
diff
changeset
|
3848 _g1(g1), _hr(hr), _cm(_g1->concurrent_mark()), _prev_marked_bytes(0), |
|
616
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|
3849 _next_marked_bytes(0), _cl(cl) {} |
| 342 | 3850 |
| 3851 size_t prev_marked_bytes() { return _prev_marked_bytes; } | |
| 3852 size_t next_marked_bytes() { return _next_marked_bytes; } | |
| 3853 | |
|
2133
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|
3854 // <original comment> |
|
352
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iveresov
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diff
changeset
|
3855 // The original idea here was to coalesce evacuated and dead objects. |
|
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|
3856 // However that caused complications with the block offset table (BOT). |
|
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diff
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|
3857 // In particular if there were two TLABs, one of them partially refined. |
|
e0c09f7ec5c4
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|
3858 // |----- TLAB_1--------|----TLAB_2-~~~(partially refined part)~~~| |
|
e0c09f7ec5c4
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|
3859 // The BOT entries of the unrefined part of TLAB_2 point to the start |
|
e0c09f7ec5c4
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|
3860 // of TLAB_2. If the last object of the TLAB_1 and the first object |
|
e0c09f7ec5c4
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|
3861 // of TLAB_2 are coalesced, then the cards of the unrefined part |
|
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diff
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|
3862 // would point into middle of the filler object. |
|
2133
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|
3863 // The current approach is to not coalesce and leave the BOT contents intact. |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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2039
diff
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|
3864 // </original comment> |
|
352
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|
3865 // |
|
2133
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changeset
|
3866 // We now reset the BOT when we start the object iteration over the |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
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2039
diff
changeset
|
3867 // region and refine its entries for every object we come across. So |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
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diff
changeset
|
3868 // the above comment is not really relevant and we should be able |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
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2039
diff
changeset
|
3869 // to coalesce dead objects if we want to. |
|
352
e0c09f7ec5c4
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diff
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|
3870 void do_object(oop obj) { |
|
2133
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diff
changeset
|
3871 HeapWord* obj_addr = (HeapWord*) obj; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3872 assert(_hr->is_in(obj_addr), "sanity"); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3873 size_t obj_size = obj->size(); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3874 _hr->update_bot_for_object(obj_addr, obj_size); |
|
352
e0c09f7ec5c4
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diff
changeset
|
3875 if (obj->is_forwarded() && obj->forwardee() == obj) { |
|
e0c09f7ec5c4
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diff
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|
3876 // The object failed to move. |
|
e0c09f7ec5c4
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diff
changeset
|
3877 assert(!_g1->is_obj_dead(obj), "We should not be preserving dead objs."); |
|
e0c09f7ec5c4
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|
3878 _cm->markPrev(obj); |
|
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
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diff
changeset
|
3879 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
|
2133
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tonyp
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|
3880 _prev_marked_bytes += (obj_size * HeapWordSize); |
|
352
e0c09f7ec5c4
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diff
changeset
|
3881 if (_g1->mark_in_progress() && !_g1->is_obj_ill(obj)) { |
|
e0c09f7ec5c4
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|
3882 _cm->markAndGrayObjectIfNecessary(obj); |
|
e0c09f7ec5c4
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|
3883 } |
|
e0c09f7ec5c4
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changeset
|
3884 obj->set_mark(markOopDesc::prototype()); |
|
e0c09f7ec5c4
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diff
changeset
|
3885 // While we were processing RSet buffers during the |
|
e0c09f7ec5c4
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changeset
|
3886 // collection, we actually didn't scan any cards on the |
|
e0c09f7ec5c4
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diff
changeset
|
3887 // collection set, since we didn't want to update remebered |
|
e0c09f7ec5c4
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diff
changeset
|
3888 // sets with entries that point into the collection set, given |
|
e0c09f7ec5c4
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diff
changeset
|
3889 // that live objects fromthe collection set are about to move |
|
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
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diff
changeset
|
3890 // and such entries will be stale very soon. This change also |
|
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6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
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diff
changeset
|
3891 // dealt with a reliability issue which involved scanning a |
|
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6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
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diff
changeset
|
3892 // card in the collection set and coming across an array that |
|
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6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
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diff
changeset
|
3893 // was being chunked and looking malformed. The problem is |
|
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6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
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diff
changeset
|
3894 // that, if evacuation fails, we might have remembered set |
|
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iveresov
parents:
342
diff
changeset
|
3895 // entries missing given that we skipped cards on the |
|
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iveresov
parents:
342
diff
changeset
|
3896 // collection set. So, we'll recreate such entries now. |
|
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
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parents:
595
diff
changeset
|
3897 obj->oop_iterate(_cl); |
|
352
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iveresov
parents:
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diff
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|
3898 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
|
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6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
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diff
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|
3899 } else { |
|
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iveresov
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diff
changeset
|
3900 // The object has been either evacuated or is dead. Fill it with a |
|
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diff
changeset
|
3901 // dummy object. |
|
2133
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7007068: G1: refine the BOT during evac failure handling
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2039
diff
changeset
|
3902 MemRegion mr((HeapWord*)obj, obj_size); |
|
481
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
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diff
changeset
|
3903 CollectedHeap::fill_with_object(mr); |
| 342 | 3904 _cm->clearRangeBothMaps(mr); |
| 3905 } | |
| 3906 } | |
| 3907 }; | |
| 3908 | |
| 3909 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
| 1705 | 3910 UpdateRSetImmediate immediate_update(_g1h->g1_rem_set()); |
|
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
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|
3911 DirtyCardQueue dcq(&_g1h->dirty_card_queue_set()); |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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diff
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|
3912 UpdateRSetDeferred deferred_update(_g1h, &dcq); |
|
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6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
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|
3913 OopsInHeapRegionClosure *cl; |
|
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6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
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|
3914 if (G1DeferredRSUpdate) { |
|
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6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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diff
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|
3915 cl = &deferred_update; |
|
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6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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diff
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|
3916 } else { |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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diff
changeset
|
3917 cl = &immediate_update; |
|
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6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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diff
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|
3918 } |
| 342 | 3919 HeapRegion* cur = g1_policy()->collection_set(); |
| 3920 while (cur != NULL) { | |
| 3921 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
|
2133
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7007068: G1: refine the BOT during evac failure handling
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|
3922 assert(!cur->isHumongous(), "sanity"); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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diff
changeset
|
3923 |
| 342 | 3924 if (cur->evacuation_failed()) { |
| 3925 assert(cur->in_collection_set(), "bad CS"); | |
|
2133
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7007068: G1: refine the BOT during evac failure handling
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|
3926 RemoveSelfPointerClosure rspc(_g1h, cur, cl); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
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2039
diff
changeset
|
3927 |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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3774
diff
changeset
|
3928 // In the common case we make sure that this is done when the |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3929 // region is freed so that it is "ready-to-go" when it's |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3930 // re-allocated. However, when evacuation failure happens, a |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3931 // region will remain in the heap and might ultimately be added |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3932 // to a CSet in the future. So we have to be careful here and |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3933 // make sure the region's RSet is ready for parallel iteration |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3934 // whenever this might be required in the future. |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3935 cur->rem_set()->reset_for_par_iteration(); |
|
2133
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7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3936 cur->reset_bot(); |
|
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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diff
changeset
|
3937 cl->set_region(cur); |
| 342 | 3938 cur->object_iterate(&rspc); |
| 3939 | |
| 3940 // A number of manipulations to make the TAMS be the current top, | |
| 3941 // and the marked bytes be the ones observed in the iteration. | |
| 3942 if (_g1h->concurrent_mark()->at_least_one_mark_complete()) { | |
| 3943 // The comments below are the postconditions achieved by the | |
| 3944 // calls. Note especially the last such condition, which says that | |
| 3945 // the count of marked bytes has been properly restored. | |
| 3946 cur->note_start_of_marking(false); | |
| 3947 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
| 3948 cur->add_to_marked_bytes(rspc.prev_marked_bytes()); | |
| 3949 // _next_marked_bytes == prev_marked_bytes. | |
| 3950 cur->note_end_of_marking(); | |
| 3951 // _prev_top_at_mark_start == top(), | |
| 3952 // _prev_marked_bytes == prev_marked_bytes | |
| 3953 } | |
| 3954 // If there is no mark in progress, we modified the _next variables | |
| 3955 // above needlessly, but harmlessly. | |
| 3956 if (_g1h->mark_in_progress()) { | |
| 3957 cur->note_start_of_marking(false); | |
| 3958 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
| 3959 // _next_marked_bytes == next_marked_bytes. | |
| 3960 } | |
| 3961 } | |
| 3962 cur = cur->next_in_collection_set(); | |
| 3963 } | |
| 3964 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
| 3965 | |
| 3966 // Now restore saved marks, if any. | |
| 3967 if (_objs_with_preserved_marks != NULL) { | |
| 3968 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
| 3969 guarantee(_objs_with_preserved_marks->length() == | |
| 3970 _preserved_marks_of_objs->length(), "Both or none."); | |
| 3971 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
| 3972 oop obj = _objs_with_preserved_marks->at(i); | |
| 3973 markOop m = _preserved_marks_of_objs->at(i); | |
| 3974 obj->set_mark(m); | |
| 3975 } | |
| 3976 // Delete the preserved marks growable arrays (allocated on the C heap). | |
| 3977 delete _objs_with_preserved_marks; | |
| 3978 delete _preserved_marks_of_objs; | |
| 3979 _objs_with_preserved_marks = NULL; | |
| 3980 _preserved_marks_of_objs = NULL; | |
| 3981 } | |
| 3982 } | |
| 3983 | |
| 3984 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
| 3985 _evac_failure_scan_stack->push(obj); | |
| 3986 } | |
| 3987 | |
| 3988 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
| 3989 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
| 3990 | |
| 3991 while (_evac_failure_scan_stack->length() > 0) { | |
| 3992 oop obj = _evac_failure_scan_stack->pop(); | |
| 3993 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
| 3994 obj->oop_iterate_backwards(_evac_failure_closure); | |
| 3995 } | |
| 3996 } | |
| 3997 | |
| 3998 oop | |
| 3999 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
|
3973
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4000 oop old, |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4001 bool should_mark_root) { |
|
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4002 assert(obj_in_cs(old), |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4003 err_msg("obj: "PTR_FORMAT" should still be in the CSet", |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4004 (HeapWord*) old)); |
| 342 | 4005 markOop m = old->mark(); |
| 4006 oop forward_ptr = old->forward_to_atomic(old); | |
| 4007 if (forward_ptr == NULL) { | |
| 4008 // Forward-to-self succeeded. | |
|
3973
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4009 |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4010 // should_mark_root will be true when this routine is called |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4011 // from a root scanning closure during an initial mark pause. |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4012 // In this case the thread that succeeds in self-forwarding the |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4013 // object is also responsible for marking the object. |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4014 if (should_mark_root) { |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4015 assert(!oopDesc::is_null(old), "shouldn't be"); |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4016 _cm->grayRoot(old); |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4017 } |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4018 |
| 342 | 4019 if (_evac_failure_closure != cl) { |
| 4020 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
| 4021 assert(!_drain_in_progress, | |
| 4022 "Should only be true while someone holds the lock."); | |
| 4023 // Set the global evac-failure closure to the current thread's. | |
| 4024 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
| 4025 set_evac_failure_closure(cl); | |
| 4026 // Now do the common part. | |
| 4027 handle_evacuation_failure_common(old, m); | |
| 4028 // Reset to NULL. | |
| 4029 set_evac_failure_closure(NULL); | |
| 4030 } else { | |
| 4031 // The lock is already held, and this is recursive. | |
| 4032 assert(_drain_in_progress, "This should only be the recursive case."); | |
| 4033 handle_evacuation_failure_common(old, m); | |
| 4034 } | |
| 4035 return old; | |
| 4036 } else { | |
|
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4037 // Forward-to-self failed. Either someone else managed to allocate |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4038 // space for this object (old != forward_ptr) or they beat us in |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4039 // self-forwarding it (old == forward_ptr). |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4040 assert(old == forward_ptr || !obj_in_cs(forward_ptr), |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4041 err_msg("obj: "PTR_FORMAT" forwarded to: "PTR_FORMAT" " |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4042 "should not be in the CSet", |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4043 (HeapWord*) old, (HeapWord*) forward_ptr)); |
| 342 | 4044 return forward_ptr; |
| 4045 } | |
| 4046 } | |
| 4047 | |
| 4048 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
| 4049 set_evacuation_failed(true); | |
| 4050 | |
| 4051 preserve_mark_if_necessary(old, m); | |
| 4052 | |
| 4053 HeapRegion* r = heap_region_containing(old); | |
| 4054 if (!r->evacuation_failed()) { | |
| 4055 r->set_evacuation_failed(true); | |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
4056 _hr_printer.evac_failure(r); |
| 342 | 4057 } |
| 4058 | |
| 4059 push_on_evac_failure_scan_stack(old); | |
| 4060 | |
| 4061 if (!_drain_in_progress) { | |
| 4062 // prevent recursion in copy_to_survivor_space() | |
| 4063 _drain_in_progress = true; | |
| 4064 drain_evac_failure_scan_stack(); | |
| 4065 _drain_in_progress = false; | |
| 4066 } | |
| 4067 } | |
| 4068 | |
| 4069 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
|
2038
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4070 assert(evacuation_failed(), "Oversaving!"); |
|
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4071 // We want to call the "for_promotion_failure" version only in the |
|
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4072 // case of a promotion failure. |
|
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4073 if (m->must_be_preserved_for_promotion_failure(obj)) { |
| 342 | 4074 if (_objs_with_preserved_marks == NULL) { |
| 4075 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
| 4076 _objs_with_preserved_marks = | |
| 4077 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 4078 _preserved_marks_of_objs = | |
| 4079 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
| 4080 } | |
| 4081 _objs_with_preserved_marks->push(obj); | |
| 4082 _preserved_marks_of_objs->push(m); | |
| 4083 } | |
| 4084 } | |
| 4085 | |
| 4086 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
| 4087 size_t word_size) { | |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4088 if (purpose == GCAllocForSurvived) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4089 HeapWord* result = survivor_attempt_allocation(word_size); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4090 if (result != NULL) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4091 return result; |
| 342 | 4092 } else { |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4093 // Let's try to allocate in the old gen in case we can fit the |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4094 // object there. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4095 return old_attempt_allocation(word_size); |
| 342 | 4096 } |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4097 } else { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4098 assert(purpose == GCAllocForTenured, "sanity"); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4099 HeapWord* result = old_attempt_allocation(word_size); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4100 if (result != NULL) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4101 return result; |
| 342 | 4102 } else { |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4103 // Let's try to allocate in the survivors in case we can fit the |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4104 // object there. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4105 return survivor_attempt_allocation(word_size); |
| 342 | 4106 } |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4107 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4108 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4109 ShouldNotReachHere(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4110 // Trying to keep some compilers happy. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4111 return NULL; |
| 342 | 4112 } |
| 4113 | |
| 4114 #ifndef PRODUCT | |
| 4115 bool GCLabBitMapClosure::do_bit(size_t offset) { | |
| 4116 HeapWord* addr = _bitmap->offsetToHeapWord(offset); | |
| 4117 guarantee(_cm->isMarked(oop(addr)), "it should be!"); | |
| 4118 return true; | |
| 4119 } | |
| 4120 #endif // PRODUCT | |
| 4121 | |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4122 G1ParGCAllocBuffer::G1ParGCAllocBuffer(size_t gclab_word_size) : |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4123 ParGCAllocBuffer(gclab_word_size), |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4124 _should_mark_objects(false), |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4125 _bitmap(G1CollectedHeap::heap()->reserved_region().start(), gclab_word_size), |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4126 _retired(false) |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4127 { |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4128 //_should_mark_objects is set to true when G1ParCopyHelper needs to |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4129 // mark the forwarded location of an evacuated object. |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4130 // We set _should_mark_objects to true if marking is active, i.e. when we |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4131 // need to propagate a mark, or during an initial mark pause, i.e. when we |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4132 // need to mark objects immediately reachable by the roots. |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4133 if (G1CollectedHeap::heap()->mark_in_progress() || |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4134 G1CollectedHeap::heap()->g1_policy()->during_initial_mark_pause()) { |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4135 _should_mark_objects = true; |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4136 } |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4137 } |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4138 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4139 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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changeset
|
4140 : _g1h(g1h), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4141 _refs(g1h->task_queue(queue_num)), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4142 _dcq(&g1h->dirty_card_queue_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4143 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4144 _g1_rem(g1h->g1_rem_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4145 _hash_seed(17), _queue_num(queue_num), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4146 _term_attempts(0), |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4147 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4148 _tenured_alloc_buffer(g1h->desired_plab_sz(GCAllocForTenured)), |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4149 _age_table(false), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4150 _strong_roots_time(0), _term_time(0), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4151 _alloc_buffer_waste(0), _undo_waste(0) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4152 { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4153 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4154 // we "sacrifice" entry 0 to keep track of surviving bytes for |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4155 // non-young regions (where the age is -1) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4156 // We also add a few elements at the beginning and at the end in |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4157 // an attempt to eliminate cache contention |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4158 size_t real_length = 1 + _g1h->g1_policy()->young_cset_length(); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4159 size_t array_length = PADDING_ELEM_NUM + |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4160 real_length + |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4161 PADDING_ELEM_NUM; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4162 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4163 if (_surviving_young_words_base == NULL) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4164 vm_exit_out_of_memory(array_length * sizeof(size_t), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4165 "Not enough space for young surv histo."); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4166 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4167 memset(_surviving_young_words, 0, real_length * sizeof(size_t)); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4168 |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4169 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4170 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4171 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4172 _start = os::elapsedTime(); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4173 } |
| 342 | 4174 |
| 1709 | 4175 void |
| 4176 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
| 4177 { | |
| 4178 st->print_raw_cr("GC Termination Stats"); | |
| 4179 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
| 4180 " ------waste (KiB)------"); | |
| 4181 st->print_raw_cr("thr ms ms % ms % attempts" | |
| 4182 " total alloc undo"); | |
| 4183 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
| 4184 " ------- ------- -------"); | |
| 4185 } | |
| 4186 | |
| 4187 void | |
| 4188 G1ParScanThreadState::print_termination_stats(int i, | |
| 4189 outputStream* const st) const | |
| 4190 { | |
| 4191 const double elapsed_ms = elapsed_time() * 1000.0; | |
| 4192 const double s_roots_ms = strong_roots_time() * 1000.0; | |
| 4193 const double term_ms = term_time() * 1000.0; | |
| 4194 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
| 4195 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
| 4196 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
| 4197 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
| 4198 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
| 4199 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
| 4200 alloc_buffer_waste() * HeapWordSize / K, | |
| 4201 undo_waste() * HeapWordSize / K); | |
| 4202 } | |
| 4203 | |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4204 #ifdef ASSERT |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4205 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4206 assert(ref != NULL, "invariant"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4207 assert(UseCompressedOops, "sanity"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4208 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4209 oop p = oopDesc::load_decode_heap_oop(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4210 assert(_g1h->is_in_g1_reserved(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4211 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4212 return true; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4213 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4214 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4215 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4216 assert(ref != NULL, "invariant"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4217 if (has_partial_array_mask(ref)) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4218 // Must be in the collection set--it's already been copied. |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4219 oop p = clear_partial_array_mask(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4220 assert(_g1h->obj_in_cs(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4221 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4222 } else { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4223 oop p = oopDesc::load_decode_heap_oop(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4224 assert(_g1h->is_in_g1_reserved(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4225 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4226 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4227 return true; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4228 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4229 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4230 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4231 if (ref.is_narrow()) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4232 return verify_ref((narrowOop*) ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4233 } else { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4234 return verify_ref((oop*) ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4235 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4236 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4237 #endif // ASSERT |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4238 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4239 void G1ParScanThreadState::trim_queue() { |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4240 assert(_evac_cl != NULL, "not set"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4241 assert(_evac_failure_cl != NULL, "not set"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4242 assert(_partial_scan_cl != NULL, "not set"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4243 |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4244 StarTask ref; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4245 do { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4246 // Drain the overflow stack first, so other threads can steal. |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4247 while (refs()->pop_overflow(ref)) { |
|
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|
4248 deal_with_reference(ref); |
|
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|
4249 } |
|
3979
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6484982: G1: process references during evacuation pauses
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|
4250 |
|
1862
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|
4251 while (refs()->pop_local(ref)) { |
|
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|
4252 deal_with_reference(ref); |
|
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|
4253 } |
|
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|
4254 } while (!refs()->is_empty()); |
|
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|
4255 } |
|
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|
4256 |
| 342 | 4257 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : |
| 4258 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), | |
|
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|
4259 _par_scan_state(par_scan_state), |
|
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|
4260 _during_initial_mark(_g1->g1_policy()->during_initial_mark_pause()), |
|
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|
4261 _mark_in_progress(_g1->mark_in_progress()) { } |
|
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|
4262 |
|
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|
4263 template <class T> void G1ParCopyHelper::mark_object(T* p) { |
|
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|
4264 // This is called from do_oop_work for objects that are not |
|
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|
4265 // in the collection set. Objects in the collection set |
|
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4266 // are marked after they have been evacuated. |
| 342 | 4267 |
|
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|
4268 T heap_oop = oopDesc::load_heap_oop(p); |
|
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|
4269 if (!oopDesc::is_null(heap_oop)) { |
|
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|
4270 oop obj = oopDesc::decode_heap_oop(heap_oop); |
|
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|
4271 HeapWord* addr = (HeapWord*)obj; |
|
3323
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|
4272 if (_g1->is_in_g1_reserved(addr)) { |
| 342 | 4273 _cm->grayRoot(oop(addr)); |
|
3323
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|
4274 } |
| 342 | 4275 } |
| 4276 } | |
| 4277 | |
|
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|
4278 oop G1ParCopyHelper::copy_to_survivor_space(oop old, bool should_mark_root, |
|
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|
4279 bool should_mark_copy) { |
| 342 | 4280 size_t word_sz = old->size(); |
| 4281 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
| 4282 // +1 to make the -1 indexes valid... | |
| 4283 int young_index = from_region->young_index_in_cset()+1; | |
| 4284 assert( (from_region->is_young() && young_index > 0) || | |
| 4285 (!from_region->is_young() && young_index == 0), "invariant" ); | |
| 4286 G1CollectorPolicy* g1p = _g1->g1_policy(); | |
| 4287 markOop m = old->mark(); | |
| 545 | 4288 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
| 4289 : m->age(); | |
| 4290 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
| 342 | 4291 word_sz); |
| 4292 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
| 4293 oop obj = oop(obj_ptr); | |
| 4294 | |
| 4295 if (obj_ptr == NULL) { | |
| 4296 // This will either forward-to-self, or detect that someone else has | |
| 4297 // installed a forwarding pointer. | |
| 4298 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
|
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|
4299 return _g1->handle_evacuation_failure_par(cl, old, should_mark_root); |
| 342 | 4300 } |
| 4301 | |
| 526 | 4302 // We're going to allocate linearly, so might as well prefetch ahead. |
| 4303 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
| 4304 | |
| 342 | 4305 oop forward_ptr = old->forward_to_atomic(obj); |
| 4306 if (forward_ptr == NULL) { | |
| 4307 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
| 526 | 4308 if (g1p->track_object_age(alloc_purpose)) { |
| 4309 // We could simply do obj->incr_age(). However, this causes a | |
| 4310 // performance issue. obj->incr_age() will first check whether | |
| 4311 // the object has a displaced mark by checking its mark word; | |
| 4312 // getting the mark word from the new location of the object | |
| 4313 // stalls. So, given that we already have the mark word and we | |
| 4314 // are about to install it anyway, it's better to increase the | |
| 4315 // age on the mark word, when the object does not have a | |
| 4316 // displaced mark word. We're not expecting many objects to have | |
| 4317 // a displaced marked word, so that case is not optimized | |
| 4318 // further (it could be...) and we simply call obj->incr_age(). | |
| 4319 | |
| 4320 if (m->has_displaced_mark_helper()) { | |
| 4321 // in this case, we have to install the mark word first, | |
| 4322 // otherwise obj looks to be forwarded (the old mark word, | |
| 4323 // which contains the forward pointer, was copied) | |
| 4324 obj->set_mark(m); | |
| 4325 obj->incr_age(); | |
| 4326 } else { | |
| 4327 m = m->incr_age(); | |
| 545 | 4328 obj->set_mark(m); |
| 526 | 4329 } |
| 545 | 4330 _par_scan_state->age_table()->add(obj, word_sz); |
| 4331 } else { | |
| 4332 obj->set_mark(m); | |
| 526 | 4333 } |
| 4334 | |
|
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|
4335 // Mark the evacuated object or propagate "next" mark bit |
|
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|
4336 if (should_mark_copy) { |
| 342 | 4337 if (!use_local_bitmaps || |
| 4338 !_par_scan_state->alloc_buffer(alloc_purpose)->mark(obj_ptr)) { | |
| 4339 // if we couldn't mark it on the local bitmap (this happens when | |
| 4340 // the object was not allocated in the GCLab), we have to bite | |
| 4341 // the bullet and do the standard parallel mark | |
| 4342 _cm->markAndGrayObjectIfNecessary(obj); | |
| 4343 } | |
|
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|
4344 |
| 342 | 4345 if (_g1->isMarkedNext(old)) { |
|
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|
4346 // Unmark the object's old location so that marking |
|
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|
4347 // doesn't think the old object is alive. |
| 342 | 4348 _cm->nextMarkBitMap()->parClear((HeapWord*)old); |
| 4349 } | |
| 4350 } | |
| 4351 | |
| 4352 size_t* surv_young_words = _par_scan_state->surviving_young_words(); | |
| 4353 surv_young_words[young_index] += word_sz; | |
| 4354 | |
| 4355 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
| 4356 arrayOop(old)->set_length(0); | |
|
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|
4357 oop* old_p = set_partial_array_mask(old); |
|
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|
4358 _par_scan_state->push_on_queue(old_p); |
| 342 | 4359 } else { |
| 526 | 4360 // No point in using the slower heap_region_containing() method, |
| 4361 // given that we know obj is in the heap. | |
| 4362 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
| 342 | 4363 obj->oop_iterate_backwards(_scanner); |
| 4364 } | |
| 4365 } else { | |
| 4366 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
| 4367 obj = forward_ptr; | |
| 4368 } | |
| 4369 return obj; | |
| 4370 } | |
| 4371 | |
|
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|
4372 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
|
845
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|
4373 template <class T> |
|
3886
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|
4374 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> |
|
845
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|
4375 ::do_oop_work(T* p) { |
|
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|
4376 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 4377 assert(barrier != G1BarrierRS || obj != NULL, |
| 4378 "Precondition: G1BarrierRS implies obj is nonNull"); | |
| 4379 | |
|
3886
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|
4380 // Marking: |
|
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|
4381 // If the object is in the collection set, then the thread |
|
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|
4382 // that copies the object should mark, or propagate the |
|
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|
4383 // mark to, the evacuated object. |
|
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|
4384 // If the object is not in the collection set then we |
|
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|
4385 // should call the mark_object() method depending on the |
|
eeae91c9baba
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|
4386 // value of the template parameter do_mark_object (which will |
|
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|
4387 // be true for root scanning closures during an initial mark |
|
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|
4388 // pause). |
|
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changeset
|
4389 // The mark_object() method first checks whether the object |
|
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|
4390 // is marked and, if not, attempts to mark the object. |
|
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|
4391 |
| 526 | 4392 // here the null check is implicit in the cset_fast_test() test |
|
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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diff
changeset
|
4393 if (_g1->in_cset_fast_test(obj)) { |
| 526 | 4394 if (obj->is_forwarded()) { |
|
845
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|
4395 oopDesc::encode_store_heap_oop(p, obj->forwardee()); |
|
3886
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|
4396 // If we are a root scanning closure during an initial |
|
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|
4397 // mark pause (i.e. do_mark_object will be true) then |
|
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|
4398 // we also need to handle marking of roots in the |
|
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|
4399 // event of an evacuation failure. In the event of an |
|
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|
4400 // evacuation failure, the object is forwarded to itself |
|
3973
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|
4401 // and not copied. For root-scanning closures, the |
|
663cb89032b1
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|
4402 // object would be marked after a successful self-forward |
|
663cb89032b1
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|
4403 // but an object could be pointed to by both a root and non |
|
663cb89032b1
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|
4404 // root location and be self-forwarded by a non-root-scanning |
|
663cb89032b1
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|
4405 // closure. Therefore we also have to attempt to mark the |
|
663cb89032b1
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|
4406 // self-forwarded root object here. |
|
3886
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|
4407 if (do_mark_object && obj->forwardee() == obj) { |
|
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|
4408 mark_object(p); |
|
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|
4409 } |
| 526 | 4410 } else { |
|
3973
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|
4411 // During an initial mark pause, objects that are pointed to |
|
663cb89032b1
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|
4412 // by the roots need to be marked - even in the event of an |
|
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|
4413 // evacuation failure. We pass the template parameter |
|
663cb89032b1
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|
4414 // do_mark_object (which is true for root scanning closures |
|
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|
4415 // during an initial mark pause) to copy_to_survivor_space |
|
663cb89032b1
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|
4416 // which will pass it on to the evacuation failure handling |
|
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|
4417 // code. The thread that successfully self-forwards a root |
|
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|
4418 // object to itself is responsible for marking the object. |
|
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|
4419 bool should_mark_root = do_mark_object; |
|
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|
4420 |
|
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|
4421 // We need to mark the copied object if we're a root scanning |
|
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|
4422 // closure during an initial mark pause (i.e. do_mark_object |
|
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|
4423 // will be true), or the object is already marked and we need |
|
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|
4424 // to propagate the mark to the evacuated copy. |
|
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|
4425 bool should_mark_copy = do_mark_object || |
|
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|
4426 _during_initial_mark || |
|
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|
4427 (_mark_in_progress && !_g1->is_obj_ill(obj)); |
|
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|
4428 |
|
3973
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|
4429 oop copy_oop = copy_to_survivor_space(obj, should_mark_root, |
|
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|
4430 should_mark_copy); |
|
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|
4431 oopDesc::encode_store_heap_oop(p, copy_oop); |
| 342 | 4432 } |
| 526 | 4433 // When scanning the RS, we only care about objs in CS. |
| 4434 if (barrier == G1BarrierRS) { | |
|
616
4f360ec815ba
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|
4435 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 342 | 4436 } |
|
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|
4437 } else { |
|
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|
4438 // The object is not in collection set. If we're a root scanning |
|
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|
4439 // closure during an initial mark pause (i.e. do_mark_object will |
|
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|
4440 // be true) then attempt to mark the object. |
|
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|
4441 if (do_mark_object) { |
|
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|
4442 mark_object(p); |
|
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|
4443 } |
| 526 | 4444 } |
| 4445 | |
| 4446 if (barrier == G1BarrierEvac && obj != NULL) { | |
|
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|
4447 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 526 | 4448 } |
| 4449 | |
| 4450 if (do_gen_barrier && obj != NULL) { | |
| 4451 par_do_barrier(p); | |
| 4452 } | |
| 4453 } | |
| 4454 | |
|
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|
4455 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
|
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|
4456 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
|
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|
4457 |
|
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|
4458 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
| 526 | 4459 assert(has_partial_array_mask(p), "invariant"); |
| 4460 oop old = clear_partial_array_mask(p); | |
| 342 | 4461 assert(old->is_objArray(), "must be obj array"); |
| 4462 assert(old->is_forwarded(), "must be forwarded"); | |
| 4463 assert(Universe::heap()->is_in_reserved(old), "must be in heap."); | |
| 4464 | |
| 4465 objArrayOop obj = objArrayOop(old->forwardee()); | |
| 4466 assert((void*)old != (void*)old->forwardee(), "self forwarding here?"); | |
| 4467 // Process ParGCArrayScanChunk elements now | |
| 4468 // and push the remainder back onto queue | |
| 4469 int start = arrayOop(old)->length(); | |
| 4470 int end = obj->length(); | |
| 4471 int remainder = end - start; | |
| 4472 assert(start <= end, "just checking"); | |
| 4473 if (remainder > 2 * ParGCArrayScanChunk) { | |
| 4474 // Test above combines last partial chunk with a full chunk | |
| 4475 end = start + ParGCArrayScanChunk; | |
| 4476 arrayOop(old)->set_length(end); | |
| 4477 // Push remainder. | |
|
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|
4478 oop* old_p = set_partial_array_mask(old); |
|
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|
4479 assert(arrayOop(old)->length() < obj->length(), "Empty push?"); |
|
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|
4480 _par_scan_state->push_on_queue(old_p); |
| 342 | 4481 } else { |
| 4482 // Restore length so that the heap remains parsable in | |
| 4483 // case of evacuation failure. | |
| 4484 arrayOop(old)->set_length(end); | |
| 4485 } | |
|
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|
4486 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
| 342 | 4487 // process our set of indices (include header in first chunk) |
|
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|
4488 obj->oop_iterate_range(&_scanner, start, end); |
| 342 | 4489 } |
| 4490 | |
| 4491 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
| 4492 protected: | |
| 4493 G1CollectedHeap* _g1h; | |
| 4494 G1ParScanThreadState* _par_scan_state; | |
| 4495 RefToScanQueueSet* _queues; | |
| 4496 ParallelTaskTerminator* _terminator; | |
| 4497 | |
| 4498 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
| 4499 RefToScanQueueSet* queues() { return _queues; } | |
| 4500 ParallelTaskTerminator* terminator() { return _terminator; } | |
| 4501 | |
| 4502 public: | |
| 4503 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
| 4504 G1ParScanThreadState* par_scan_state, | |
| 4505 RefToScanQueueSet* queues, | |
| 4506 ParallelTaskTerminator* terminator) | |
| 4507 : _g1h(g1h), _par_scan_state(par_scan_state), | |
| 4508 _queues(queues), _terminator(terminator) {} | |
| 4509 | |
|
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|
4510 void do_void(); |
|
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4511 |
|
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|
4512 private: |
|
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|
4513 inline bool offer_termination(); |
|
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|
4514 }; |
|
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|
4515 |
|
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|
4516 bool G1ParEvacuateFollowersClosure::offer_termination() { |
|
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|
4517 G1ParScanThreadState* const pss = par_scan_state(); |
|
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|
4518 pss->start_term_time(); |
|
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|
4519 const bool res = terminator()->offer_termination(); |
|
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|
4520 pss->end_term_time(); |
|
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|
4521 return res; |
|
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|
4522 } |
|
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|
4523 |
|
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|
4524 void G1ParEvacuateFollowersClosure::do_void() { |
|
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|
4525 StarTask stolen_task; |
|
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|
4526 G1ParScanThreadState* const pss = par_scan_state(); |
|
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|
4527 pss->trim_queue(); |
|
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|
4528 |
|
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|
4529 do { |
|
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|
4530 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
|
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|
4531 assert(pss->verify_task(stolen_task), "sanity"); |
|
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|
4532 if (stolen_task.is_narrow()) { |
|
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|
4533 pss->deal_with_reference((narrowOop*) stolen_task); |
|
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|
4534 } else { |
|
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|
4535 pss->deal_with_reference((oop*) stolen_task); |
|
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|
4536 } |
|
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|
4537 |
|
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|
4538 // We've just processed a reference and we might have made |
|
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|
4539 // available new entries on the queues. So we have to make sure |
|
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|
4540 // we drain the queues as necessary. |
| 342 | 4541 pss->trim_queue(); |
| 4542 } | |
|
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|
4543 } while (!offer_termination()); |
|
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|
4544 |
|
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|
4545 pss->retire_alloc_buffers(); |
|
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|
4546 } |
| 342 | 4547 |
| 4548 class G1ParTask : public AbstractGangTask { | |
| 4549 protected: | |
| 4550 G1CollectedHeap* _g1h; | |
| 4551 RefToScanQueueSet *_queues; | |
| 4552 ParallelTaskTerminator _terminator; | |
|
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|
4553 int _n_workers; |
| 342 | 4554 |
| 4555 Mutex _stats_lock; | |
| 4556 Mutex* stats_lock() { return &_stats_lock; } | |
| 4557 | |
| 4558 size_t getNCards() { | |
| 4559 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
| 4560 / G1BlockOffsetSharedArray::N_bytes; | |
| 4561 } | |
| 4562 | |
| 4563 public: | |
| 4564 G1ParTask(G1CollectedHeap* g1h, int workers, RefToScanQueueSet *task_queues) | |
| 4565 : AbstractGangTask("G1 collection"), | |
| 4566 _g1h(g1h), | |
| 4567 _queues(task_queues), | |
| 4568 _terminator(workers, _queues), | |
|
845
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|
4569 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true), |
|
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|
4570 _n_workers(workers) |
| 342 | 4571 {} |
| 4572 | |
| 4573 RefToScanQueueSet* queues() { return _queues; } | |
| 4574 | |
| 4575 RefToScanQueue *work_queue(int i) { | |
| 4576 return queues()->queue(i); | |
| 4577 } | |
| 4578 | |
| 4579 void work(int i) { | |
|
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|
4580 if (i >= _n_workers) return; // no work needed this round |
| 1611 | 4581 |
| 4582 double start_time_ms = os::elapsedTime() * 1000.0; | |
| 4583 _g1h->g1_policy()->record_gc_worker_start_time(i, start_time_ms); | |
| 4584 | |
| 342 | 4585 ResourceMark rm; |
| 4586 HandleMark hm; | |
| 4587 | |
|
3979
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|
4588 ReferenceProcessor* rp = _g1h->ref_processor_stw(); |
|
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|
4589 |
| 526 | 4590 G1ParScanThreadState pss(_g1h, i); |
|
3979
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|
4591 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, rp); |
|
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|
4592 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, rp); |
|
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|
4593 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, rp); |
| 342 | 4594 |
| 4595 pss.set_evac_closure(&scan_evac_cl); | |
| 4596 pss.set_evac_failure_closure(&evac_failure_cl); | |
| 4597 pss.set_partial_scan_closure(&partial_scan_cl); | |
| 4598 | |
|
3979
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|
4599 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss, rp); |
|
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|
4600 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss, rp); |
|
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|
4601 |
|
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|
4602 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss, rp); |
|
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|
4603 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss, rp); |
|
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|
4604 |
|
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|
4605 OopClosure* scan_root_cl = &only_scan_root_cl; |
|
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|
4606 OopsInHeapRegionClosure* scan_perm_cl = &only_scan_perm_cl; |
| 342 | 4607 |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
4608 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
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|
4609 // We also need to mark copied objects. |
| 342 | 4610 scan_root_cl = &scan_mark_root_cl; |
| 4611 scan_perm_cl = &scan_mark_perm_cl; | |
| 4612 } | |
| 4613 | |
|
3983
811ec3d0833b
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changeset
|
4614 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
|
3979
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|
4615 |
| 342 | 4616 pss.start_strong_roots(); |
| 4617 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
| 4618 SharedHeap::SO_AllClasses, | |
| 4619 scan_root_cl, | |
|
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|
4620 &push_heap_rs_cl, |
| 342 | 4621 scan_perm_cl, |
| 4622 i); | |
| 4623 pss.end_strong_roots(); | |
|
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|
4624 |
| 342 | 4625 { |
| 4626 double start = os::elapsedTime(); | |
| 4627 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
| 4628 evac.do_void(); | |
| 4629 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
| 4630 double term_ms = pss.term_time()*1000.0; | |
| 4631 _g1h->g1_policy()->record_obj_copy_time(i, elapsed_ms-term_ms); | |
| 1611 | 4632 _g1h->g1_policy()->record_termination(i, term_ms, pss.term_attempts()); |
| 342 | 4633 } |
| 1282 | 4634 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
| 342 | 4635 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
| 4636 | |
| 4637 // Clean up any par-expanded rem sets. | |
| 4638 HeapRegionRemSet::par_cleanup(); | |
| 4639 | |
| 4640 if (ParallelGCVerbose) { | |
| 1709 | 4641 MutexLocker x(stats_lock()); |
| 4642 pss.print_termination_stats(i); | |
| 342 | 4643 } |
| 4644 | |
|
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|
4645 assert(pss.refs()->is_empty(), "should be empty"); |
| 1611 | 4646 double end_time_ms = os::elapsedTime() * 1000.0; |
| 4647 _g1h->g1_policy()->record_gc_worker_end_time(i, end_time_ms); | |
| 342 | 4648 } |
| 4649 }; | |
| 4650 | |
| 4651 // *** Common G1 Evacuation Stuff | |
| 4652 | |
|
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|
4653 // This method is run in a GC worker. |
|
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|
4654 |
| 342 | 4655 void |
| 4656 G1CollectedHeap:: | |
| 4657 g1_process_strong_roots(bool collecting_perm_gen, | |
| 4658 SharedHeap::ScanningOption so, | |
| 4659 OopClosure* scan_non_heap_roots, | |
| 4660 OopsInHeapRegionClosure* scan_rs, | |
| 4661 OopsInGenClosure* scan_perm, | |
| 4662 int worker_i) { | |
|
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|
4663 |
| 342 | 4664 // First scan the strong roots, including the perm gen. |
| 4665 double ext_roots_start = os::elapsedTime(); | |
| 4666 double closure_app_time_sec = 0.0; | |
| 4667 | |
| 4668 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
| 4669 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
| 4670 buf_scan_perm.set_generation(perm_gen()); | |
| 4671 | |
|
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|
4672 // Walk the code cache w/o buffering, because StarTask cannot handle |
|
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|
4673 // unaligned oop locations. |
|
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|
4674 CodeBlobToOopClosure eager_scan_code_roots(scan_non_heap_roots, /*do_marking=*/ true); |
|
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|
4675 |
|
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|
4676 process_strong_roots(false, // no scoping; this is parallel code |
|
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|
4677 collecting_perm_gen, so, |
| 342 | 4678 &buf_scan_non_heap_roots, |
|
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|
4679 &eager_scan_code_roots, |
| 342 | 4680 &buf_scan_perm); |
|
1394
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|
4681 |
|
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|
4682 // Now the CM ref_processor roots. |
|
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|
4683 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { |
|
3979
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|
4684 // We need to treat the discovered reference lists of the |
|
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|
4685 // concurrent mark ref processor as roots and keep entries |
|
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|
4686 // (which are added by the marking threads) on them live |
|
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|
4687 // until they can be processed at the end of marking. |
|
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|
4688 ref_processor_cm()->weak_oops_do(&buf_scan_non_heap_roots); |
|
3823
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|
4689 } |
|
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|
4690 |
|
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|
4691 // Finish up any enqueued closure apps (attributed as object copy time). |
| 342 | 4692 buf_scan_non_heap_roots.done(); |
| 4693 buf_scan_perm.done(); | |
|
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|
4694 |
| 342 | 4695 double ext_roots_end = os::elapsedTime(); |
|
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|
4696 |
| 342 | 4697 g1_policy()->reset_obj_copy_time(worker_i); |
|
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|
4698 double obj_copy_time_sec = buf_scan_perm.closure_app_seconds() + |
|
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|
4699 buf_scan_non_heap_roots.closure_app_seconds(); |
| 342 | 4700 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); |
|
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|
4701 |
| 342 | 4702 double ext_root_time_ms = |
| 4703 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
|
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|
4704 |
| 342 | 4705 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); |
| 4706 | |
| 4707 // Scan strong roots in mark stack. | |
| 4708 if (!_process_strong_tasks->is_task_claimed(G1H_PS_mark_stack_oops_do)) { | |
| 4709 concurrent_mark()->oops_do(scan_non_heap_roots); | |
| 4710 } | |
| 4711 double mark_stack_scan_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; | |
| 4712 g1_policy()->record_mark_stack_scan_time(worker_i, mark_stack_scan_ms); | |
| 4713 | |
| 4714 // Now scan the complement of the collection set. | |
| 4715 if (scan_rs != NULL) { | |
| 4716 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
| 4717 } | |
|
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|
4718 |
| 342 | 4719 _process_strong_tasks->all_tasks_completed(); |
| 4720 } | |
| 4721 | |
| 4722 void | |
| 4723 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
| 4724 OopClosure* non_root_closure) { | |
|
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|
4725 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
|
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|
4726 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
| 342 | 4727 } |
| 4728 | |
|
3979
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|
4729 // Weak Reference Processing support |
|
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|
4730 |
|
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|
4731 // An always "is_alive" closure that is used to preserve referents. |
|
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|
4732 // If the object is non-null then it's alive. Used in the preservation |
|
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|
4733 // of referent objects that are pointed to by reference objects |
|
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|
4734 // discovered by the CM ref processor. |
|
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|
4735 class G1AlwaysAliveClosure: public BoolObjectClosure { |
|
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|
4736 G1CollectedHeap* _g1; |
|
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|
4737 public: |
|
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|
4738 G1AlwaysAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
|
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|
4739 void do_object(oop p) { assert(false, "Do not call."); } |
|
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|
4740 bool do_object_b(oop p) { |
|
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changeset
|
4741 if (p != NULL) { |
|
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|
4742 return true; |
|
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|
4743 } |
|
4dfb2df418f2
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|
4744 return false; |
|
4dfb2df418f2
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|
4745 } |
|
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|
4746 }; |
|
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|
4747 |
|
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changeset
|
4748 bool G1STWIsAliveClosure::do_object_b(oop p) { |
|
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|
4749 // An object is reachable if it is outside the collection set, |
|
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changeset
|
4750 // or is inside and copied. |
|
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|
4751 return !_g1->obj_in_cs(p) || p->is_forwarded(); |
|
4dfb2df418f2
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|
4752 } |
|
4dfb2df418f2
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changeset
|
4753 |
|
4dfb2df418f2
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changeset
|
4754 // Non Copying Keep Alive closure |
|
4dfb2df418f2
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changeset
|
4755 class G1KeepAliveClosure: public OopClosure { |
|
4dfb2df418f2
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changeset
|
4756 G1CollectedHeap* _g1; |
|
4dfb2df418f2
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changeset
|
4757 public: |
|
4dfb2df418f2
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changeset
|
4758 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
|
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|
4759 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
|
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changeset
|
4760 void do_oop( oop* p) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4761 oop obj = *p; |
|
4dfb2df418f2
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changeset
|
4762 |
|
4dfb2df418f2
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diff
changeset
|
4763 if (_g1->obj_in_cs(obj)) { |
|
4dfb2df418f2
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changeset
|
4764 assert( obj->is_forwarded(), "invariant" ); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
4765 *p = obj->forwardee(); |
|
4dfb2df418f2
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changeset
|
4766 } |
|
4dfb2df418f2
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changeset
|
4767 } |
|
4dfb2df418f2
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|
4768 }; |
|
4dfb2df418f2
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changeset
|
4769 |
|
4dfb2df418f2
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changeset
|
4770 // Copying Keep Alive closure - can be called from both |
|
4dfb2df418f2
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changeset
|
4771 // serial and parallel code as long as different worker |
|
4dfb2df418f2
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changeset
|
4772 // threads utilize different G1ParScanThreadState instances |
|
4dfb2df418f2
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changeset
|
4773 // and different queues. |
|
4dfb2df418f2
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changeset
|
4774 |
|
4dfb2df418f2
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changeset
|
4775 class G1CopyingKeepAliveClosure: public OopClosure { |
|
4dfb2df418f2
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changeset
|
4776 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
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changeset
|
4777 OopClosure* _copy_non_heap_obj_cl; |
|
4dfb2df418f2
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changeset
|
4778 OopsInHeapRegionClosure* _copy_perm_obj_cl; |
|
4dfb2df418f2
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changeset
|
4779 G1ParScanThreadState* _par_scan_state; |
|
4dfb2df418f2
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changeset
|
4780 |
|
4dfb2df418f2
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|
4781 public: |
|
4dfb2df418f2
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diff
changeset
|
4782 G1CopyingKeepAliveClosure(G1CollectedHeap* g1h, |
|
4dfb2df418f2
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changeset
|
4783 OopClosure* non_heap_obj_cl, |
|
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changeset
|
4784 OopsInHeapRegionClosure* perm_obj_cl, |
|
4dfb2df418f2
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changeset
|
4785 G1ParScanThreadState* pss): |
|
4dfb2df418f2
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changeset
|
4786 _g1h(g1h), |
|
4dfb2df418f2
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changeset
|
4787 _copy_non_heap_obj_cl(non_heap_obj_cl), |
|
4dfb2df418f2
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changeset
|
4788 _copy_perm_obj_cl(perm_obj_cl), |
|
4dfb2df418f2
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changeset
|
4789 _par_scan_state(pss) |
|
4dfb2df418f2
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changeset
|
4790 {} |
|
4dfb2df418f2
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changeset
|
4791 |
|
4dfb2df418f2
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|
4792 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
4dfb2df418f2
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|
4793 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
4dfb2df418f2
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|
4794 |
|
4dfb2df418f2
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changeset
|
4795 template <class T> void do_oop_work(T* p) { |
|
4dfb2df418f2
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|
4796 oop obj = oopDesc::load_decode_heap_oop(p); |
|
4dfb2df418f2
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|
4797 |
|
4dfb2df418f2
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changeset
|
4798 if (_g1h->obj_in_cs(obj)) { |
|
4dfb2df418f2
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|
4799 // If the referent object has been forwarded (either copied |
|
4dfb2df418f2
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|
4800 // to a new location or to itself in the event of an |
|
4dfb2df418f2
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|
4801 // evacuation failure) then we need to update the reference |
|
4dfb2df418f2
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|
4802 // field and, if both reference and referent are in the G1 |
|
4dfb2df418f2
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|
4803 // heap, update the RSet for the referent. |
|
4dfb2df418f2
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|
4804 // |
|
4dfb2df418f2
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changeset
|
4805 // If the referent has not been forwarded then we have to keep |
|
4dfb2df418f2
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|
4806 // it alive by policy. Therefore we have copy the referent. |
|
4dfb2df418f2
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|
4807 // |
|
4dfb2df418f2
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changeset
|
4808 // If the reference field is in the G1 heap then we can push |
|
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|
4809 // on the PSS queue. When the queue is drained (after each |
|
4dfb2df418f2
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changeset
|
4810 // phase of reference processing) the object and it's followers |
|
4dfb2df418f2
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changeset
|
4811 // will be copied, the reference field set to point to the |
|
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|
4812 // new location, and the RSet updated. Otherwise we need to |
|
4dfb2df418f2
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diff
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|
4813 // use the the non-heap or perm closures directly to copy |
|
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parents:
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diff
changeset
|
4814 // the refernt object and update the pointer, while avoiding |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4815 // updating the RSet. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4816 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4817 if (_g1h->is_in_g1_reserved(p)) { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4818 _par_scan_state->push_on_queue(p); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4819 } else { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4820 // The reference field is not in the G1 heap. |
|
4dfb2df418f2
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diff
changeset
|
4821 if (_g1h->perm_gen()->is_in(p)) { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4822 _copy_perm_obj_cl->do_oop(p); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4823 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4824 _copy_non_heap_obj_cl->do_oop(p); |
|
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6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4825 } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4826 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4827 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4828 } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4829 }; |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4830 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4831 // Serial drain queue closure. Called as the 'complete_gc' |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4832 // closure for each discovered list in some of the |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4833 // reference processing phases. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4834 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4835 class G1STWDrainQueueClosure: public VoidClosure { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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|
4836 protected: |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4837 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4838 G1ParScanThreadState* _par_scan_state; |
|
4dfb2df418f2
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parents:
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|
4839 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
4840 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } |
|
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parents:
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changeset
|
4841 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4842 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4843 G1STWDrainQueueClosure(G1CollectedHeap* g1h, G1ParScanThreadState* pss) : |
|
4dfb2df418f2
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parents:
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|
4844 _g1h(g1h), |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4845 _par_scan_state(pss) |
|
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6484982: G1: process references during evacuation pauses
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parents:
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|
4846 { } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4847 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4848 void do_void() { |
|
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parents:
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diff
changeset
|
4849 G1ParScanThreadState* const pss = par_scan_state(); |
|
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parents:
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diff
changeset
|
4850 pss->trim_queue(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4851 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4852 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4853 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4854 // Parallel Reference Processing closures |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4855 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4856 // Implementation of AbstractRefProcTaskExecutor for parallel reference |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4857 // processing during G1 evacuation pauses. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4858 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4859 class G1STWRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
4860 private: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4861 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
4862 RefToScanQueueSet* _queues; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4863 WorkGang* _workers; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4864 int _active_workers; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4865 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4866 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4867 G1STWRefProcTaskExecutor(G1CollectedHeap* g1h, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4868 WorkGang* workers, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4869 RefToScanQueueSet *task_queues, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4870 int n_workers) : |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4871 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4872 _queues(task_queues), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4873 _workers(workers), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4874 _active_workers(n_workers) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4875 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4876 assert(n_workers > 0, "shouldn't call this otherwise"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4877 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4878 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4879 // Executes the given task using concurrent marking worker threads. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4880 virtual void execute(ProcessTask& task); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4881 virtual void execute(EnqueueTask& task); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4882 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4883 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4884 // Gang task for possibly parallel reference processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4885 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4886 class G1STWRefProcTaskProxy: public AbstractGangTask { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4887 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4888 ProcessTask& _proc_task; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4889 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4890 RefToScanQueueSet *_task_queues; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4891 ParallelTaskTerminator* _terminator; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4892 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4893 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4894 G1STWRefProcTaskProxy(ProcessTask& proc_task, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4895 G1CollectedHeap* g1h, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4896 RefToScanQueueSet *task_queues, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4897 ParallelTaskTerminator* terminator) : |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4898 AbstractGangTask("Process reference objects in parallel"), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4899 _proc_task(proc_task), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4900 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4901 _task_queues(task_queues), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4902 _terminator(terminator) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4903 {} |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4904 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4905 virtual void work(int i) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4906 // The reference processing task executed by a single worker. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4907 ResourceMark rm; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4908 HandleMark hm; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4909 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4910 G1STWIsAliveClosure is_alive(_g1h); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4911 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4912 G1ParScanThreadState pss(_g1h, i); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4913 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4914 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4915 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4916 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4917 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4918 pss.set_evac_closure(&scan_evac_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4919 pss.set_evac_failure_closure(&evac_failure_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4920 pss.set_partial_scan_closure(&partial_scan_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4921 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4922 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4923 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4924 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4925 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4926 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4927 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4928 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4929 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4930 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4931 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4932 // We also need to mark copied objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4933 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4934 copy_perm_cl = ©_mark_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4935 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4936 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4937 // Keep alive closure. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4938 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4939 |
|
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|
4940 // Complete GC closure |
|
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|
4941 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _task_queues, _terminator); |
|
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|
4942 |
|
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diff
changeset
|
4943 // Call the reference processing task's work routine. |
|
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changeset
|
4944 _proc_task.work(i, is_alive, keep_alive, drain_queue); |
|
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|
4945 |
|
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|
4946 // Note we cannot assert that the refs array is empty here as not all |
|
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|
4947 // of the processing tasks (specifically phase2 - pp2_work) execute |
|
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|
4948 // the complete_gc closure (which ordinarily would drain the queue) so |
|
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changeset
|
4949 // the queue may not be empty. |
|
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|
4950 } |
|
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|
4951 }; |
|
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|
4952 |
|
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|
4953 // Driver routine for parallel reference processing. |
|
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|
4954 // Creates an instance of the ref processing gang |
|
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|
4955 // task and has the worker threads execute it. |
|
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|
4956 void G1STWRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
|
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|
4957 assert(_workers != NULL, "Need parallel worker threads."); |
|
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|
4958 |
|
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|
4959 ParallelTaskTerminator terminator(_active_workers, _queues); |
|
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|
4960 G1STWRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _queues, &terminator); |
|
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|
4961 |
|
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|
4962 _g1h->set_par_threads(_active_workers); |
|
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|
4963 _workers->run_task(&proc_task_proxy); |
|
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|
4964 _g1h->set_par_threads(0); |
|
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|
4965 } |
|
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|
4966 |
|
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|
4967 // Gang task for parallel reference enqueueing. |
|
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|
4968 |
|
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|
4969 class G1STWRefEnqueueTaskProxy: public AbstractGangTask { |
|
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|
4970 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
|
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|
4971 EnqueueTask& _enq_task; |
|
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|
4972 |
|
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|
4973 public: |
|
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|
4974 G1STWRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
|
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|
4975 AbstractGangTask("Enqueue reference objects in parallel"), |
|
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|
4976 _enq_task(enq_task) |
|
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|
4977 { } |
|
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|
4978 |
|
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|
4979 virtual void work(int i) { |
|
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|
4980 _enq_task.work(i); |
|
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|
4981 } |
|
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|
4982 }; |
|
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|
4983 |
|
4dfb2df418f2
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|
4984 // Driver routine for parallel reference enqueing. |
|
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|
4985 // Creates an instance of the ref enqueueing gang |
|
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|
4986 // task and has the worker threads execute it. |
|
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|
4987 |
|
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|
4988 void G1STWRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
|
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|
4989 assert(_workers != NULL, "Need parallel worker threads."); |
|
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|
4990 |
|
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|
4991 G1STWRefEnqueueTaskProxy enq_task_proxy(enq_task); |
|
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|
4992 |
|
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|
4993 _g1h->set_par_threads(_active_workers); |
|
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|
4994 _workers->run_task(&enq_task_proxy); |
|
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|
4995 _g1h->set_par_threads(0); |
|
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|
4996 } |
|
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changeset
|
4997 |
|
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|
4998 // End of weak reference support closures |
|
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|
4999 |
|
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|
5000 // Abstract task used to preserve (i.e. copy) any referent objects |
|
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|
5001 // that are in the collection set and are pointed to by reference |
|
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|
5002 // objects discovered by the CM ref processor. |
|
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changeset
|
5003 |
|
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|
5004 class G1ParPreserveCMReferentsTask: public AbstractGangTask { |
|
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|
5005 protected: |
|
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diff
changeset
|
5006 G1CollectedHeap* _g1h; |
|
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|
5007 RefToScanQueueSet *_queues; |
|
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diff
changeset
|
5008 ParallelTaskTerminator _terminator; |
|
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diff
changeset
|
5009 int _n_workers; |
|
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diff
changeset
|
5010 |
|
4dfb2df418f2
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diff
changeset
|
5011 public: |
|
4dfb2df418f2
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diff
changeset
|
5012 G1ParPreserveCMReferentsTask(G1CollectedHeap* g1h,int workers, RefToScanQueueSet *task_queues) : |
|
4dfb2df418f2
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changeset
|
5013 AbstractGangTask("ParPreserveCMReferents"), |
|
4dfb2df418f2
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diff
changeset
|
5014 _g1h(g1h), |
|
4dfb2df418f2
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diff
changeset
|
5015 _queues(task_queues), |
|
4dfb2df418f2
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diff
changeset
|
5016 _terminator(workers, _queues), |
|
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changeset
|
5017 _n_workers(workers) |
|
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diff
changeset
|
5018 { } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5019 |
|
4dfb2df418f2
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diff
changeset
|
5020 void work(int i) { |
|
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diff
changeset
|
5021 ResourceMark rm; |
|
4dfb2df418f2
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diff
changeset
|
5022 HandleMark hm; |
|
4dfb2df418f2
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diff
changeset
|
5023 |
|
4dfb2df418f2
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diff
changeset
|
5024 G1ParScanThreadState pss(_g1h, i); |
|
4dfb2df418f2
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changeset
|
5025 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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|
5026 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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|
5027 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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changeset
|
5028 |
|
4dfb2df418f2
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diff
changeset
|
5029 pss.set_evac_closure(&scan_evac_cl); |
|
4dfb2df418f2
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changeset
|
5030 pss.set_evac_failure_closure(&evac_failure_cl); |
|
4dfb2df418f2
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changeset
|
5031 pss.set_partial_scan_closure(&partial_scan_cl); |
|
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changeset
|
5032 |
|
4dfb2df418f2
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diff
changeset
|
5033 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
|
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diff
changeset
|
5034 |
|
4dfb2df418f2
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diff
changeset
|
5035 |
|
4dfb2df418f2
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diff
changeset
|
5036 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
|
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|
5037 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
|
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changeset
|
5038 |
|
4dfb2df418f2
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diff
changeset
|
5039 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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changeset
|
5040 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
|
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changeset
|
5041 |
|
4dfb2df418f2
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diff
changeset
|
5042 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
4dfb2df418f2
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|
5043 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
4dfb2df418f2
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|
5044 |
|
4dfb2df418f2
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diff
changeset
|
5045 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
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diff
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|
5046 // We also need to mark copied objects. |
|
4dfb2df418f2
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diff
changeset
|
5047 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
4dfb2df418f2
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|
5048 copy_perm_cl = ©_mark_perm_cl; |
|
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changeset
|
5049 } |
|
4dfb2df418f2
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diff
changeset
|
5050 |
|
4dfb2df418f2
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diff
changeset
|
5051 // Is alive closure |
|
4dfb2df418f2
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diff
changeset
|
5052 G1AlwaysAliveClosure always_alive(_g1h); |
|
4dfb2df418f2
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diff
changeset
|
5053 |
|
4dfb2df418f2
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diff
changeset
|
5054 // Copying keep alive closure. Applied to referent objects that need |
|
4dfb2df418f2
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diff
changeset
|
5055 // to be copied. |
|
4dfb2df418f2
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diff
changeset
|
5056 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
|
4dfb2df418f2
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diff
changeset
|
5057 |
|
4dfb2df418f2
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diff
changeset
|
5058 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
|
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diff
changeset
|
5059 |
|
4dfb2df418f2
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diff
changeset
|
5060 int limit = ReferenceProcessor::number_of_subclasses_of_ref() * rp->max_num_q(); |
|
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|
5061 int stride = MIN2(MAX2(_n_workers, 1), limit); |
|
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diff
changeset
|
5062 |
|
4dfb2df418f2
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diff
changeset
|
5063 // limit is set using max_num_q() - which was set using ParallelGCThreads. |
|
4dfb2df418f2
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changeset
|
5064 // So this must be true - but assert just in case someone decides to |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5065 // change the worker ids. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5066 assert(0 <= i && i < limit, "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5067 assert(!rp->discovery_is_atomic(), "check this code"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5068 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5069 // Select discovered lists [i, i+stride, i+2*stride,...,limit) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5070 for (int idx = i; idx < limit; idx += stride) { |
|
4014
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
4013
diff
changeset
|
5071 DiscoveredList& ref_list = rp->discovered_refs()[idx]; |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5072 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5073 DiscoveredListIterator iter(ref_list, &keep_alive, &always_alive); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5074 while (iter.has_next()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5075 // Since discovery is not atomic for the CM ref processor, we |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5076 // can see some null referent objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5077 iter.load_ptrs(DEBUG_ONLY(true)); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5078 oop ref = iter.obj(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5079 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5080 // This will filter nulls. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5081 if (iter.is_referent_alive()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5082 iter.make_referent_alive(); |
|
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6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5083 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5084 iter.move_to_next(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5085 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5086 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5087 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5088 // Drain the queue - which may cause stealing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5089 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _queues, &_terminator); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5090 drain_queue.do_void(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5091 // Allocation buffers were retired at the end of G1ParEvacuateFollowersClosure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5092 assert(pss.refs()->is_empty(), "should be"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5093 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5094 }; |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5095 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5096 // Weak Reference processing during an evacuation pause (part 1). |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5097 void G1CollectedHeap::process_discovered_references() { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5098 double ref_proc_start = os::elapsedTime(); |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5099 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5100 ReferenceProcessor* rp = _ref_processor_stw; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5101 assert(rp->discovery_enabled(), "should have been enabled"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5102 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5103 // Any reference objects, in the collection set, that were 'discovered' |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5104 // by the CM ref processor should have already been copied (either by |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5105 // applying the external root copy closure to the discovered lists, or |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5106 // by following an RSet entry). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5107 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5108 // But some of the referents, that are in the collection set, that these |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5109 // reference objects point to may not have been copied: the STW ref |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5110 // processor would have seen that the reference object had already |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5111 // been 'discovered' and would have skipped discovering the reference, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5112 // but would not have treated the reference object as a regular oop. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5113 // As a reult the copy closure would not have been applied to the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5114 // referent object. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5115 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5116 // We need to explicitly copy these referent objects - the references |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5117 // will be processed at the end of remarking. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5118 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5119 // We also need to do this copying before we process the reference |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5120 // objects discovered by the STW ref processor in case one of these |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5121 // referents points to another object which is also referenced by an |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5122 // object discovered by the STW ref processor. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5123 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5124 int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5125 workers()->total_workers() : 1); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5126 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5127 set_par_threads(n_workers); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5128 G1ParPreserveCMReferentsTask keep_cm_referents(this, n_workers, _task_queues); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5129 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5130 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5131 workers()->run_task(&keep_cm_referents); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5132 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5133 keep_cm_referents.work(0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5134 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5135 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5136 set_par_threads(0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5137 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5138 // Closure to test whether a referent is alive. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5139 G1STWIsAliveClosure is_alive(this); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5140 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5141 // Even when parallel reference processing is enabled, the processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5142 // of JNI refs is serial and performed serially by the current thread |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5143 // rather than by a worker. The following PSS will be used for processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5144 // JNI refs. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5145 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5146 // Use only a single queue for this PSS. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5147 G1ParScanThreadState pss(this, 0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5148 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5149 // We do not embed a reference processor in the copying/scanning |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5150 // closures while we're actually processing the discovered |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5151 // reference objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5152 G1ParScanHeapEvacClosure scan_evac_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5153 G1ParScanHeapEvacFailureClosure evac_failure_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5154 G1ParScanPartialArrayClosure partial_scan_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5155 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5156 pss.set_evac_closure(&scan_evac_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5157 pss.set_evac_failure_closure(&evac_failure_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5158 pss.set_partial_scan_closure(&partial_scan_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5159 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5160 assert(pss.refs()->is_empty(), "pre-condition"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5161 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5162 G1ParScanExtRootClosure only_copy_non_heap_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5163 G1ParScanPermClosure only_copy_perm_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5164 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5165 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5166 G1ParScanAndMarkPermClosure copy_mark_perm_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5167 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5168 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5169 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5170 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5171 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5172 // We also need to mark copied objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5173 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5174 copy_perm_cl = ©_mark_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5175 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5176 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5177 // Keep alive closure. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5178 G1CopyingKeepAliveClosure keep_alive(this, copy_non_heap_cl, copy_perm_cl, &pss); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5179 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5180 // Serial Complete GC closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5181 G1STWDrainQueueClosure drain_queue(this, &pss); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5182 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5183 // Setup the soft refs policy... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5184 rp->setup_policy(false); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5185 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5186 if (!rp->processing_is_mt()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5187 // Serial reference processing... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5188 rp->process_discovered_references(&is_alive, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5189 &keep_alive, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
5190 &drain_queue, |
|
4dfb2df418f2
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diff
changeset
|
5191 NULL); |
|
4dfb2df418f2
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diff
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|
5192 } else { |
|
4dfb2df418f2
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diff
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|
5193 // Parallel reference processing |
|
4dfb2df418f2
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diff
changeset
|
5194 int active_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); |
|
4dfb2df418f2
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|
5195 assert(rp->num_q() == active_workers, "sanity"); |
|
4dfb2df418f2
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|
5196 assert(active_workers <= rp->max_num_q(), "sanity"); |
|
4dfb2df418f2
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|
5197 |
|
4dfb2df418f2
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diff
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|
5198 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
|
4dfb2df418f2
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|
5199 rp->process_discovered_references(&is_alive, &keep_alive, &drain_queue, &par_task_executor); |
|
4dfb2df418f2
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|
5200 } |
|
4dfb2df418f2
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diff
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|
5201 |
|
4dfb2df418f2
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|
5202 // We have completed copying any necessary live referent objects |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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changeset
|
5203 // (that were not copied during the actual pause) so we can |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5204 // retire any active alloc buffers |
|
4dfb2df418f2
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diff
changeset
|
5205 pss.retire_alloc_buffers(); |
|
4dfb2df418f2
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diff
changeset
|
5206 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5207 |
|
4dfb2df418f2
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diff
changeset
|
5208 double ref_proc_time = os::elapsedTime() - ref_proc_start; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
5209 g1_policy()->record_ref_proc_time(ref_proc_time * 1000.0); |
|
4dfb2df418f2
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diff
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|
5210 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5211 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5212 // Weak Reference processing during an evacuation pause (part 2). |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5213 void G1CollectedHeap::enqueue_discovered_references() { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5214 double ref_enq_start = os::elapsedTime(); |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5215 |
|
4dfb2df418f2
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diff
changeset
|
5216 ReferenceProcessor* rp = _ref_processor_stw; |
|
4dfb2df418f2
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parents:
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|
5217 assert(!rp->discovery_enabled(), "should have been disabled as part of processing"); |
|
4dfb2df418f2
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parents:
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diff
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|
5218 |
|
4dfb2df418f2
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diff
changeset
|
5219 // Now enqueue any remaining on the discovered lists on to |
|
4dfb2df418f2
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diff
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|
5220 // the pending list. |
|
4dfb2df418f2
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diff
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|
5221 if (!rp->processing_is_mt()) { |
|
4dfb2df418f2
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parents:
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diff
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|
5222 // Serial reference processing... |
|
4dfb2df418f2
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diff
changeset
|
5223 rp->enqueue_discovered_references(); |
|
4dfb2df418f2
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parents:
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diff
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|
5224 } else { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5225 // Parallel reference enqueuing |
|
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5226 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5227 int active_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); |
|
4dfb2df418f2
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|
5228 assert(rp->num_q() == active_workers, "sanity"); |
|
4dfb2df418f2
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|
5229 assert(active_workers <= rp->max_num_q(), "sanity"); |
|
4dfb2df418f2
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diff
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|
5230 |
|
4dfb2df418f2
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3973
diff
changeset
|
5231 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
|
4dfb2df418f2
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changeset
|
5232 rp->enqueue_discovered_references(&par_task_executor); |
|
4dfb2df418f2
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johnc
parents:
3973
diff
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|
5233 } |
|
4dfb2df418f2
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diff
changeset
|
5234 |
|
4dfb2df418f2
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diff
changeset
|
5235 rp->verify_no_references_recorded(); |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5236 assert(!rp->discovery_enabled(), "should have been disabled"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5237 |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5238 // FIXME |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5239 // CM's reference processing also cleans up the string and symbol tables. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5240 // Should we do that here also? We could, but it is a serial operation |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5241 // and could signicantly increase the pause time. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5242 |
|
4dfb2df418f2
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diff
changeset
|
5243 double ref_enq_time = os::elapsedTime() - ref_enq_start; |
|
4dfb2df418f2
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diff
changeset
|
5244 g1_policy()->record_ref_enq_time(ref_enq_time * 1000.0); |
|
4dfb2df418f2
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johnc
parents:
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diff
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|
5245 } |
|
4dfb2df418f2
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diff
changeset
|
5246 |
| 342 | 5247 void G1CollectedHeap::evacuate_collection_set() { |
| 5248 set_evacuation_failed(false); | |
| 5249 | |
| 5250 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
| 5251 concurrent_g1_refine()->set_use_cache(false); | |
| 889 | 5252 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
| 5253 | |
| 342 | 5254 int n_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); |
| 5255 set_par_threads(n_workers); | |
| 5256 G1ParTask g1_par_task(this, n_workers, _task_queues); | |
| 5257 | |
| 5258 init_for_evac_failure(NULL); | |
| 5259 | |
| 5260 rem_set()->prepare_for_younger_refs_iterate(true); | |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5261 |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5262 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
| 342 | 5263 double start_par = os::elapsedTime(); |
|
3979
4dfb2df418f2
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parents:
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diff
changeset
|
5264 |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
5265 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 5266 // The individual threads will set their evac-failure closures. |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5267 StrongRootsScope srs(this); |
| 1709 | 5268 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
| 342 | 5269 workers()->run_task(&g1_par_task); |
| 5270 } else { | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5271 StrongRootsScope srs(this); |
| 342 | 5272 g1_par_task.work(0); |
| 5273 } | |
| 5274 | |
| 5275 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
| 5276 g1_policy()->record_par_time(par_time); | |
| 5277 set_par_threads(0); | |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5278 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5279 // Process any discovered reference objects - we have |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5280 // to do this _before_ we retire the GC alloc regions |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5281 // as we may have to copy some 'reachable' referent |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5282 // objects (and their reachable sub-graphs) that were |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5283 // not copied during the pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5284 process_discovered_references(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5285 |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5286 // Weak root processing. |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5287 // Note: when JSR 292 is enabled and code blobs can contain |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5288 // non-perm oops then we will need to process the code blobs |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5289 // here too. |
| 342 | 5290 { |
|
3979
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5291 G1STWIsAliveClosure is_alive(this); |
| 342 | 5292 G1KeepAliveClosure keep_alive(this); |
| 5293 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
| 5294 } | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5295 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5296 release_gc_alloc_regions(); |
| 342 | 5297 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); |
|
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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595
diff
changeset
|
5298 |
| 889 | 5299 concurrent_g1_refine()->clear_hot_cache(); |
| 342 | 5300 concurrent_g1_refine()->set_use_cache(true); |
| 5301 | |
| 5302 finalize_for_evac_failure(); | |
| 5303 | |
| 5304 // Must do this before removing self-forwarding pointers, which clears | |
| 5305 // the per-region evac-failure flags. | |
| 5306 concurrent_mark()->complete_marking_in_collection_set(); | |
| 5307 | |
| 5308 if (evacuation_failed()) { | |
| 5309 remove_self_forwarding_pointers(); | |
| 5310 if (PrintGCDetails) { | |
|
1719
b63010841f78
6975964: G1: print out a more descriptive message for evacuation failure when +PrintGCDetails is set
tonyp
parents:
1718
diff
changeset
|
5311 gclog_or_tty->print(" (to-space overflow)"); |
| 342 | 5312 } else if (PrintGC) { |
| 5313 gclog_or_tty->print("--"); | |
| 5314 } | |
| 5315 } | |
| 5316 | |
|
3979
4dfb2df418f2
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diff
changeset
|
5317 // Enqueue any remaining references remaining on the STW |
|
4dfb2df418f2
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johnc
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3973
diff
changeset
|
5318 // reference processor's discovered lists. We need to do |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5319 // this after the card table is cleaned (and verified) as |
|
4dfb2df418f2
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3973
diff
changeset
|
5320 // the act of enqueuing entries on to the pending list |
|
4dfb2df418f2
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johnc
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3973
diff
changeset
|
5321 // will log these updates (and dirty their associated |
|
4dfb2df418f2
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johnc
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3973
diff
changeset
|
5322 // cards). We need these updates logged to update any |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5323 // RSets. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5324 enqueue_discovered_references(); |
|
4dfb2df418f2
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3973
diff
changeset
|
5325 |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5326 if (G1DeferredRSUpdate) { |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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595
diff
changeset
|
5327 RedirtyLoggedCardTableEntryFastClosure redirty; |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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595
diff
changeset
|
5328 dirty_card_queue_set().set_closure(&redirty); |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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595
diff
changeset
|
5329 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
| 1111 | 5330 |
| 5331 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
| 5332 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5333 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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595
diff
changeset
|
5334 } |
| 342 | 5335 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
| 5336 } | |
| 5337 | |
| 2173 | 5338 void G1CollectedHeap::free_region_if_empty(HeapRegion* hr, |
| 2152 | 5339 size_t* pre_used, |
| 5340 FreeRegionList* free_list, | |
| 5341 HumongousRegionSet* humongous_proxy_set, | |
| 2173 | 5342 HRRSCleanupTask* hrrs_cleanup_task, |
| 2152 | 5343 bool par) { |
| 5344 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { | |
| 5345 if (hr->isHumongous()) { | |
| 5346 assert(hr->startsHumongous(), "we should only see starts humongous"); | |
| 5347 free_humongous_region(hr, pre_used, free_list, humongous_proxy_set, par); | |
| 5348 } else { | |
| 5349 free_region(hr, pre_used, free_list, par); | |
| 342 | 5350 } |
| 2173 | 5351 } else { |
| 5352 hr->rem_set()->do_cleanup_work(hrrs_cleanup_task); | |
| 342 | 5353 } |
| 5354 } | |
| 5355 | |
| 2152 | 5356 void G1CollectedHeap::free_region(HeapRegion* hr, |
| 5357 size_t* pre_used, | |
| 5358 FreeRegionList* free_list, | |
| 5359 bool par) { | |
| 5360 assert(!hr->isHumongous(), "this is only for non-humongous regions"); | |
| 5361 assert(!hr->is_empty(), "the region should not be empty"); | |
| 5362 assert(free_list != NULL, "pre-condition"); | |
| 5363 | |
| 5364 *pre_used += hr->used(); | |
| 5365 hr->hr_clear(par, true /* clear_space */); | |
|
2432
455328d90876
7029458: G1: Add newly-reclaimed regions to the beginning of the region free list, not the end
tonyp
parents:
2369
diff
changeset
|
5366 free_list->add_as_head(hr); |
| 2152 | 5367 } |
| 5368 | |
| 5369 void G1CollectedHeap::free_humongous_region(HeapRegion* hr, | |
| 5370 size_t* pre_used, | |
| 5371 FreeRegionList* free_list, | |
| 5372 HumongousRegionSet* humongous_proxy_set, | |
| 5373 bool par) { | |
| 5374 assert(hr->startsHumongous(), "this is only for starts humongous regions"); | |
| 5375 assert(free_list != NULL, "pre-condition"); | |
| 5376 assert(humongous_proxy_set != NULL, "pre-condition"); | |
| 5377 | |
| 5378 size_t hr_used = hr->used(); | |
| 5379 size_t hr_capacity = hr->capacity(); | |
| 5380 size_t hr_pre_used = 0; | |
| 5381 _humongous_set.remove_with_proxy(hr, humongous_proxy_set); | |
| 5382 hr->set_notHumongous(); | |
| 5383 free_region(hr, &hr_pre_used, free_list, par); | |
| 5384 | |
| 3766 | 5385 size_t i = hr->hrs_index() + 1; |
| 2152 | 5386 size_t num = 1; |
| 3766 | 5387 while (i < n_regions()) { |
| 5388 HeapRegion* curr_hr = region_at(i); | |
| 2152 | 5389 if (!curr_hr->continuesHumongous()) { |
| 5390 break; | |
| 5391 } | |
| 5392 curr_hr->set_notHumongous(); | |
| 5393 free_region(curr_hr, &hr_pre_used, free_list, par); | |
| 5394 num += 1; | |
| 5395 i += 1; | |
| 5396 } | |
| 5397 assert(hr_pre_used == hr_used, | |
| 5398 err_msg("hr_pre_used: "SIZE_FORMAT" and hr_used: "SIZE_FORMAT" " | |
| 5399 "should be the same", hr_pre_used, hr_used)); | |
| 5400 *pre_used += hr_pre_used; | |
| 5401 } | |
| 5402 | |
| 5403 void G1CollectedHeap::update_sets_after_freeing_regions(size_t pre_used, | |
| 5404 FreeRegionList* free_list, | |
| 5405 HumongousRegionSet* humongous_proxy_set, | |
| 5406 bool par) { | |
| 5407 if (pre_used > 0) { | |
| 5408 Mutex* lock = (par) ? ParGCRareEvent_lock : NULL; | |
| 342 | 5409 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); |
| 2152 | 5410 assert(_summary_bytes_used >= pre_used, |
| 5411 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" " | |
| 5412 "should be >= pre_used: "SIZE_FORMAT, | |
| 5413 _summary_bytes_used, pre_used)); | |
| 342 | 5414 _summary_bytes_used -= pre_used; |
| 2152 | 5415 } |
| 5416 if (free_list != NULL && !free_list->is_empty()) { | |
| 5417 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); | |
|
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|
5418 _free_list.add_as_head(free_list); |
| 2152 | 5419 } |
| 5420 if (humongous_proxy_set != NULL && !humongous_proxy_set->is_empty()) { | |
| 5421 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
| 5422 _humongous_set.update_from_proxy(humongous_proxy_set); | |
| 342 | 5423 } |
| 5424 } | |
| 5425 | |
|
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|
5426 class G1ParCleanupCTTask : public AbstractGangTask { |
|
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|
5427 CardTableModRefBS* _ct_bs; |
|
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|
5428 G1CollectedHeap* _g1h; |
|
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|
5429 HeapRegion* volatile _su_head; |
|
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|
5430 public: |
|
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|
5431 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
|
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|
5432 G1CollectedHeap* g1h) : |
|
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|
5433 AbstractGangTask("G1 Par Cleanup CT Task"), |
|
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|
5434 _ct_bs(ct_bs), _g1h(g1h) { } |
|
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|
5435 |
|
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|
5436 void work(int i) { |
|
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|
5437 HeapRegion* r; |
|
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|
5438 while (r = _g1h->pop_dirty_cards_region()) { |
|
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|
5439 clear_cards(r); |
|
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|
5440 } |
|
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|
5441 } |
|
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|
5442 |
|
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|
5443 void clear_cards(HeapRegion* r) { |
|
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|
5444 // Cards of the survivors should have already been dirtied. |
|
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|
5445 if (!r->is_survivor()) { |
|
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|
5446 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
|
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|
5447 } |
|
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|
5448 } |
|
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|
5449 }; |
|
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|
5450 |
|
940
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|
5451 #ifndef PRODUCT |
|
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|
5452 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
|
3317
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|
5453 G1CollectedHeap* _g1h; |
|
940
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|
5454 CardTableModRefBS* _ct_bs; |
|
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|
5455 public: |
|
3317
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|
5456 G1VerifyCardTableCleanup(G1CollectedHeap* g1h, CardTableModRefBS* ct_bs) |
|
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|
5457 : _g1h(g1h), _ct_bs(ct_bs) { } |
|
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|
5458 virtual bool doHeapRegion(HeapRegion* r) { |
|
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|
5459 if (r->is_survivor()) { |
|
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|
5460 _g1h->verify_dirty_region(r); |
|
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|
5461 } else { |
|
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|
5462 _g1h->verify_not_dirty_region(r); |
|
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|
5463 } |
|
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|
5464 return false; |
|
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|
5465 } |
|
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|
5466 }; |
|
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|
5467 |
|
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|
5468 void G1CollectedHeap::verify_not_dirty_region(HeapRegion* hr) { |
|
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|
5469 // All of the region should be clean. |
|
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|
5470 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); |
|
063382f9b575
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|
5471 MemRegion mr(hr->bottom(), hr->end()); |
|
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|
5472 ct_bs->verify_not_dirty_region(mr); |
|
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|
5473 } |
|
063382f9b575
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|
5474 |
|
063382f9b575
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|
5475 void G1CollectedHeap::verify_dirty_region(HeapRegion* hr) { |
|
063382f9b575
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|
5476 // We cannot guarantee that [bottom(),end()] is dirty. Threads |
|
063382f9b575
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changeset
|
5477 // dirty allocated blocks as they allocate them. The thread that |
|
063382f9b575
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changeset
|
5478 // retires each region and replaces it with a new one will do a |
|
063382f9b575
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|
5479 // maximal allocation to fill in [pre_dummy_top(),end()] but will |
|
063382f9b575
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|
5480 // not dirty that area (one less thing to have to do while holding |
|
063382f9b575
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changeset
|
5481 // a lock). So we can only verify that [bottom(),pre_dummy_top()] |
|
063382f9b575
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|
5482 // is dirty. |
|
063382f9b575
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diff
changeset
|
5483 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
|
063382f9b575
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|
5484 MemRegion mr(hr->bottom(), hr->pre_dummy_top()); |
|
063382f9b575
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|
5485 ct_bs->verify_dirty_region(mr); |
|
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|
5486 } |
|
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|
5487 |
|
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|
5488 void G1CollectedHeap::verify_dirty_young_list(HeapRegion* head) { |
|
3317
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|
5489 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
|
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|
5490 for (HeapRegion* hr = head; hr != NULL; hr = hr->get_next_young_region()) { |
|
3317
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|
5491 verify_dirty_region(hr); |
|
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|
5492 } |
|
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|
5493 } |
|
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|
5494 |
|
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|
5495 void G1CollectedHeap::verify_dirty_young_regions() { |
|
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|
5496 verify_dirty_young_list(_young_list->first_region()); |
|
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|
5497 verify_dirty_young_list(_young_list->first_survivor_region()); |
|
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|
5498 } |
|
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|
5499 #endif |
|
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|
5500 |
| 342 | 5501 void G1CollectedHeap::cleanUpCardTable() { |
| 5502 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
| 5503 double start = os::elapsedTime(); | |
| 5504 | |
| 4023 | 5505 { |
| 5506 // Iterate over the dirty cards region list. | |
| 5507 G1ParCleanupCTTask cleanup_task(ct_bs, this); | |
| 5508 | |
| 5509 if (ParallelGCThreads > 0) { | |
| 5510 set_par_threads(workers()->total_workers()); | |
| 5511 workers()->run_task(&cleanup_task); | |
| 5512 set_par_threads(0); | |
| 5513 } else { | |
| 5514 while (_dirty_cards_region_list) { | |
| 5515 HeapRegion* r = _dirty_cards_region_list; | |
| 5516 cleanup_task.clear_cards(r); | |
| 5517 _dirty_cards_region_list = r->get_next_dirty_cards_region(); | |
| 5518 if (_dirty_cards_region_list == r) { | |
| 5519 // The last region. | |
| 5520 _dirty_cards_region_list = NULL; | |
| 5521 } | |
| 5522 r->set_next_dirty_cards_region(NULL); | |
|
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|
5523 } |
|
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|
5524 } |
| 4023 | 5525 #ifndef PRODUCT |
| 5526 if (G1VerifyCTCleanup || VerifyAfterGC) { | |
| 5527 G1VerifyCardTableCleanup cleanup_verifier(this, ct_bs); | |
| 5528 heap_region_iterate(&cleanup_verifier); | |
| 5529 } | |
| 5530 #endif | |
|
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|
5531 } |
|
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|
5532 |
| 342 | 5533 double elapsed = os::elapsedTime() - start; |
|
3979
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|
5534 g1_policy()->record_clear_ct_time(elapsed * 1000.0); |
| 342 | 5535 } |
| 5536 | |
| 5537 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
| 2152 | 5538 size_t pre_used = 0; |
| 5539 FreeRegionList local_free_list("Local List for CSet Freeing"); | |
| 5540 | |
| 342 | 5541 double young_time_ms = 0.0; |
| 5542 double non_young_time_ms = 0.0; | |
| 5543 | |
|
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|
5544 // Since the collection set is a superset of the the young list, |
|
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|
5545 // all we need to do to clear the young list is clear its |
|
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|
5546 // head and length, and unlink any young regions in the code below |
|
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|
5547 _young_list->clear(); |
|
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|
5548 |
| 342 | 5549 G1CollectorPolicy* policy = g1_policy(); |
| 5550 | |
| 5551 double start_sec = os::elapsedTime(); | |
| 5552 bool non_young = true; | |
| 5553 | |
| 5554 HeapRegion* cur = cs_head; | |
| 5555 int age_bound = -1; | |
| 5556 size_t rs_lengths = 0; | |
| 5557 | |
| 5558 while (cur != NULL) { | |
| 2361 | 5559 assert(!is_on_master_free_list(cur), "sanity"); |
| 2152 | 5560 |
| 342 | 5561 if (non_young) { |
| 5562 if (cur->is_young()) { | |
| 5563 double end_sec = os::elapsedTime(); | |
| 5564 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 5565 non_young_time_ms += elapsed_ms; | |
| 5566 | |
| 5567 start_sec = os::elapsedTime(); | |
| 5568 non_young = false; | |
| 5569 } | |
| 5570 } else { | |
| 2152 | 5571 double end_sec = os::elapsedTime(); |
| 5572 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 5573 young_time_ms += elapsed_ms; | |
| 5574 | |
| 5575 start_sec = os::elapsedTime(); | |
| 5576 non_young = true; | |
| 342 | 5577 } |
| 5578 | |
| 5579 rs_lengths += cur->rem_set()->occupied(); | |
| 5580 | |
| 5581 HeapRegion* next = cur->next_in_collection_set(); | |
| 5582 assert(cur->in_collection_set(), "bad CS"); | |
| 5583 cur->set_next_in_collection_set(NULL); | |
| 5584 cur->set_in_collection_set(false); | |
| 5585 | |
| 5586 if (cur->is_young()) { | |
| 5587 int index = cur->young_index_in_cset(); | |
| 5588 guarantee( index != -1, "invariant" ); | |
| 5589 guarantee( (size_t)index < policy->young_cset_length(), "invariant" ); | |
| 5590 size_t words_survived = _surviving_young_words[index]; | |
| 5591 cur->record_surv_words_in_group(words_survived); | |
|
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|
5592 |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5593 // At this point the we have 'popped' cur from the collection set |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5594 // (linked via next_in_collection_set()) but it is still in the |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5595 // young list (linked via next_young_region()). Clear the |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5596 // _next_young_region field. |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5597 cur->set_next_young_region(NULL); |
| 342 | 5598 } else { |
| 5599 int index = cur->young_index_in_cset(); | |
| 5600 guarantee( index == -1, "invariant" ); | |
| 5601 } | |
| 5602 | |
| 5603 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
| 5604 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
| 5605 "invariant" ); | |
| 5606 | |
| 5607 if (!cur->evacuation_failed()) { | |
| 5608 // And the region is empty. | |
| 2152 | 5609 assert(!cur->is_empty(), "Should not have empty regions in a CS."); |
| 5610 free_region(cur, &pre_used, &local_free_list, false /* par */); | |
| 342 | 5611 } else { |
| 5612 cur->uninstall_surv_rate_group(); | |
| 5613 if (cur->is_young()) | |
| 5614 cur->set_young_index_in_cset(-1); | |
| 5615 cur->set_not_young(); | |
| 5616 cur->set_evacuation_failed(false); | |
| 5617 } | |
| 5618 cur = next; | |
| 5619 } | |
| 5620 | |
| 5621 policy->record_max_rs_lengths(rs_lengths); | |
| 5622 policy->cset_regions_freed(); | |
| 5623 | |
| 5624 double end_sec = os::elapsedTime(); | |
| 5625 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 5626 if (non_young) | |
| 5627 non_young_time_ms += elapsed_ms; | |
| 5628 else | |
| 5629 young_time_ms += elapsed_ms; | |
| 5630 | |
| 2152 | 5631 update_sets_after_freeing_regions(pre_used, &local_free_list, |
| 5632 NULL /* humongous_proxy_set */, | |
| 5633 false /* par */); | |
| 342 | 5634 policy->record_young_free_cset_time_ms(young_time_ms); |
| 5635 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
| 5636 } | |
| 5637 | |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5638 // This routine is similar to the above but does not record |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5639 // any policy statistics or update free lists; we are abandoning |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5640 // the current incremental collection set in preparation of a |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5641 // full collection. After the full GC we will start to build up |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5642 // the incremental collection set again. |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5643 // This is only called when we're doing a full collection |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5644 // and is immediately followed by the tearing down of the young list. |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5645 |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5646 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5647 HeapRegion* cur = cs_head; |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5648 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
5649 while (cur != NULL) { |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
5650 HeapRegion* next = cur->next_in_collection_set(); |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5651 assert(cur->in_collection_set(), "bad CS"); |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5652 cur->set_next_in_collection_set(NULL); |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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changeset
|
5653 cur->set_in_collection_set(false); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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changeset
|
5654 cur->set_young_index_in_cset(-1); |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
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|
5655 cur = next; |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
5656 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5657 } |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
5658 |
| 2152 | 5659 void G1CollectedHeap::set_free_regions_coming() { |
| 5660 if (G1ConcRegionFreeingVerbose) { | |
| 5661 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
| 5662 "setting free regions coming"); | |
| 5663 } | |
| 5664 | |
| 5665 assert(!free_regions_coming(), "pre-condition"); | |
| 5666 _free_regions_coming = true; | |
| 342 | 5667 } |
| 5668 | |
| 2152 | 5669 void G1CollectedHeap::reset_free_regions_coming() { |
| 5670 { | |
| 5671 assert(free_regions_coming(), "pre-condition"); | |
| 5672 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 5673 _free_regions_coming = false; | |
| 5674 SecondaryFreeList_lock->notify_all(); | |
| 5675 } | |
| 5676 | |
| 5677 if (G1ConcRegionFreeingVerbose) { | |
| 5678 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
| 5679 "reset free regions coming"); | |
| 342 | 5680 } |
| 5681 } | |
| 5682 | |
| 2152 | 5683 void G1CollectedHeap::wait_while_free_regions_coming() { |
| 5684 // Most of the time we won't have to wait, so let's do a quick test | |
| 5685 // first before we take the lock. | |
| 5686 if (!free_regions_coming()) { | |
| 5687 return; | |
| 5688 } | |
| 5689 | |
| 5690 if (G1ConcRegionFreeingVerbose) { | |
| 5691 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
| 5692 "waiting for free regions"); | |
| 342 | 5693 } |
| 5694 | |
| 5695 { | |
| 2152 | 5696 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
| 5697 while (free_regions_coming()) { | |
| 5698 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 342 | 5699 } |
| 2152 | 5700 } |
| 5701 | |
| 5702 if (G1ConcRegionFreeingVerbose) { | |
| 5703 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
| 5704 "done waiting for free regions"); | |
| 5705 } | |
| 342 | 5706 } |
| 5707 | |
| 5708 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
| 5709 assert(heap_lock_held_for_gc(), | |
| 5710 "the heap lock should already be held by or for this thread"); | |
| 5711 _young_list->push_region(hr); | |
| 5712 g1_policy()->set_region_short_lived(hr); | |
| 5713 } | |
| 5714 | |
| 5715 class NoYoungRegionsClosure: public HeapRegionClosure { | |
| 5716 private: | |
| 5717 bool _success; | |
| 5718 public: | |
| 5719 NoYoungRegionsClosure() : _success(true) { } | |
| 5720 bool doHeapRegion(HeapRegion* r) { | |
| 5721 if (r->is_young()) { | |
| 5722 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
| 5723 r->bottom(), r->end()); | |
| 5724 _success = false; | |
| 5725 } | |
| 5726 return false; | |
| 5727 } | |
| 5728 bool success() { return _success; } | |
| 5729 }; | |
| 5730 | |
|
1394
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
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|
5731 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
5732 bool ret = _young_list->check_list_empty(check_sample); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5733 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5734 if (check_heap) { |
| 342 | 5735 NoYoungRegionsClosure closure; |
| 5736 heap_region_iterate(&closure); | |
| 5737 ret = ret && closure.success(); | |
| 5738 } | |
| 5739 | |
| 5740 return ret; | |
| 5741 } | |
| 5742 | |
| 5743 void G1CollectedHeap::empty_young_list() { | |
| 5744 assert(heap_lock_held_for_gc(), | |
| 5745 "the heap lock should already be held by or for this thread"); | |
| 5746 | |
| 5747 _young_list->empty_list(); | |
| 5748 } | |
| 5749 | |
| 5750 // Done at the start of full GC. | |
| 5751 void G1CollectedHeap::tear_down_region_lists() { | |
| 2152 | 5752 _free_list.remove_all(); |
| 342 | 5753 } |
| 5754 | |
| 5755 class RegionResetter: public HeapRegionClosure { | |
| 2152 | 5756 G1CollectedHeap* _g1h; |
| 5757 FreeRegionList _local_free_list; | |
| 5758 | |
| 342 | 5759 public: |
| 2152 | 5760 RegionResetter() : _g1h(G1CollectedHeap::heap()), |
| 5761 _local_free_list("Local Free List for RegionResetter") { } | |
| 5762 | |
| 342 | 5763 bool doHeapRegion(HeapRegion* r) { |
| 5764 if (r->continuesHumongous()) return false; | |
| 5765 if (r->top() > r->bottom()) { | |
| 5766 if (r->top() < r->end()) { | |
| 5767 Copy::fill_to_words(r->top(), | |
| 5768 pointer_delta(r->end(), r->top())); | |
| 5769 } | |
| 5770 } else { | |
| 5771 assert(r->is_empty(), "tautology"); | |
| 2152 | 5772 _local_free_list.add_as_tail(r); |
| 342 | 5773 } |
| 5774 return false; | |
| 5775 } | |
| 5776 | |
| 2152 | 5777 void update_free_lists() { |
| 5778 _g1h->update_sets_after_freeing_regions(0, &_local_free_list, NULL, | |
| 5779 false /* par */); | |
| 5780 } | |
| 342 | 5781 }; |
| 5782 | |
| 5783 // Done at the end of full GC. | |
| 5784 void G1CollectedHeap::rebuild_region_lists() { | |
| 5785 // This needs to go at the end of the full GC. | |
| 5786 RegionResetter rs; | |
| 5787 heap_region_iterate(&rs); | |
| 2152 | 5788 rs.update_free_lists(); |
| 342 | 5789 } |
| 5790 | |
| 5791 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
| 5792 _refine_cte_cl->set_concurrent(concurrent); | |
| 5793 } | |
| 5794 | |
| 5795 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
| 5796 HeapRegion* hr = heap_region_containing(p); | |
| 5797 if (hr == NULL) { | |
| 5798 return is_in_permanent(p); | |
| 5799 } else { | |
| 5800 return hr->is_in(p); | |
| 5801 } | |
| 5802 } | |
| 2152 | 5803 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5804 // Methods for the mutator alloc region |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5805 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5806 HeapRegion* G1CollectedHeap::new_mutator_alloc_region(size_t word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5807 bool force) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5808 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5809 assert(!force || g1_policy()->can_expand_young_list(), |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5810 "if force is true we should be able to expand the young list"); |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
5811 bool young_list_full = g1_policy()->is_young_list_full(); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
5812 if (force || !young_list_full) { |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5813 HeapRegion* new_alloc_region = new_region(word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5814 false /* do_expand */); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5815 if (new_alloc_region != NULL) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5816 g1_policy()->update_region_num(true /* next_is_young */); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5817 set_region_short_lived_locked(new_alloc_region); |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
5818 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Eden, young_list_full); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5819 return new_alloc_region; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5820 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5821 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5822 return NULL; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5823 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5824 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5825 void G1CollectedHeap::retire_mutator_alloc_region(HeapRegion* alloc_region, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5826 size_t allocated_bytes) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5827 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5828 assert(alloc_region->is_young(), "all mutator alloc regions should be young"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5829 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5830 g1_policy()->add_region_to_incremental_cset_lhs(alloc_region); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5831 _summary_bytes_used += allocated_bytes; |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
5832 _hr_printer.retire(alloc_region); |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
5833 // We update the eden sizes here, when the region is retired, |
|
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
5834 // instead of when it's allocated, since this is the point that its |
|
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
5835 // used space has been recored in _summary_bytes_used. |
|
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
5836 g1mm()->update_eden_size(); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5837 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5838 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5839 HeapRegion* MutatorAllocRegion::allocate_new_region(size_t word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5840 bool force) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5841 return _g1h->new_mutator_alloc_region(word_size, force); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5842 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5843 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5844 void MutatorAllocRegion::retire_region(HeapRegion* alloc_region, |
|
abdfc822206f
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5845 size_t allocated_bytes) { |
|
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5846 _g1h->retire_mutator_alloc_region(alloc_region, allocated_bytes); |
|
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5847 } |
|
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5848 |
|
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5849 // Methods for the GC alloc regions |
|
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5850 |
|
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5851 HeapRegion* G1CollectedHeap::new_gc_alloc_region(size_t word_size, |
|
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5852 size_t count, |
|
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5853 GCAllocPurpose ap) { |
|
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5854 assert(FreeList_lock->owned_by_self(), "pre-condition"); |
|
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5855 |
|
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5856 if (count < g1_policy()->max_regions(ap)) { |
|
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5857 HeapRegion* new_alloc_region = new_region(word_size, |
|
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5858 true /* do_expand */); |
|
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5859 if (new_alloc_region != NULL) { |
|
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5860 // We really only need to do this for old regions given that we |
|
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5861 // should never scan survivors. But it doesn't hurt to do it |
|
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5862 // for survivors too. |
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5863 new_alloc_region->set_saved_mark(); |
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5864 if (ap == GCAllocForSurvived) { |
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5865 new_alloc_region->set_survivor(); |
|
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5866 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Survivor); |
|
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5867 } else { |
|
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5868 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Old); |
|
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5869 } |
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5870 return new_alloc_region; |
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5871 } else { |
|
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5872 g1_policy()->note_alloc_region_limit_reached(ap); |
|
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5873 } |
|
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5874 } |
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5875 return NULL; |
|
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5876 } |
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5877 |
|
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5878 void G1CollectedHeap::retire_gc_alloc_region(HeapRegion* alloc_region, |
|
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5879 size_t allocated_bytes, |
|
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5880 GCAllocPurpose ap) { |
|
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5881 alloc_region->note_end_of_copying(); |
|
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5882 g1_policy()->record_bytes_copied_during_gc(allocated_bytes); |
|
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5883 if (ap == GCAllocForSurvived) { |
|
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|
5884 young_list()->add_survivor_region(alloc_region); |
|
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|
5885 } |
|
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|
5886 _hr_printer.retire(alloc_region); |
|
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|
5887 } |
|
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|
5888 |
|
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|
5889 HeapRegion* SurvivorGCAllocRegion::allocate_new_region(size_t word_size, |
|
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|
5890 bool force) { |
|
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|
5891 assert(!force, "not supported for GC alloc regions"); |
|
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5892 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForSurvived); |
|
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|
5893 } |
|
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|
5894 |
|
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|
5895 void SurvivorGCAllocRegion::retire_region(HeapRegion* alloc_region, |
|
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|
5896 size_t allocated_bytes) { |
|
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|
5897 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
|
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|
5898 GCAllocForSurvived); |
|
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|
5899 } |
|
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|
5900 |
|
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|
5901 HeapRegion* OldGCAllocRegion::allocate_new_region(size_t word_size, |
|
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|
5902 bool force) { |
|
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|
5903 assert(!force, "not supported for GC alloc regions"); |
|
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|
5904 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForTenured); |
|
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|
5905 } |
|
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|
5906 |
|
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|
5907 void OldGCAllocRegion::retire_region(HeapRegion* alloc_region, |
|
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|
5908 size_t allocated_bytes) { |
|
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|
5909 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
|
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|
5910 GCAllocForTenured); |
|
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|
5911 } |
|
2433
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|
5912 // Heap region set verification |
|
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|
5913 |
| 2152 | 5914 class VerifyRegionListsClosure : public HeapRegionClosure { |
| 5915 private: | |
| 5916 HumongousRegionSet* _humongous_set; | |
| 5917 FreeRegionList* _free_list; | |
| 5918 size_t _region_count; | |
| 5919 | |
| 5920 public: | |
| 5921 VerifyRegionListsClosure(HumongousRegionSet* humongous_set, | |
| 5922 FreeRegionList* free_list) : | |
| 5923 _humongous_set(humongous_set), _free_list(free_list), | |
| 5924 _region_count(0) { } | |
| 5925 | |
| 5926 size_t region_count() { return _region_count; } | |
| 5927 | |
| 5928 bool doHeapRegion(HeapRegion* hr) { | |
| 5929 _region_count += 1; | |
| 5930 | |
| 5931 if (hr->continuesHumongous()) { | |
| 5932 return false; | |
| 5933 } | |
| 5934 | |
| 5935 if (hr->is_young()) { | |
| 5936 // TODO | |
| 5937 } else if (hr->startsHumongous()) { | |
| 5938 _humongous_set->verify_next_region(hr); | |
| 5939 } else if (hr->is_empty()) { | |
| 5940 _free_list->verify_next_region(hr); | |
| 5941 } | |
| 5942 return false; | |
| 5943 } | |
| 5944 }; | |
| 5945 | |
| 3766 | 5946 HeapRegion* G1CollectedHeap::new_heap_region(size_t hrs_index, |
| 5947 HeapWord* bottom) { | |
| 5948 HeapWord* end = bottom + HeapRegion::GrainWords; | |
| 5949 MemRegion mr(bottom, end); | |
| 5950 assert(_g1_reserved.contains(mr), "invariant"); | |
| 5951 // This might return NULL if the allocation fails | |
| 5952 return new HeapRegion(hrs_index, _bot_shared, mr, true /* is_zeroed */); | |
| 5953 } | |
| 5954 | |
| 2152 | 5955 void G1CollectedHeap::verify_region_sets() { |
| 5956 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); | |
| 5957 | |
| 5958 // First, check the explicit lists. | |
| 5959 _free_list.verify(); | |
| 5960 { | |
| 5961 // Given that a concurrent operation might be adding regions to | |
| 5962 // the secondary free list we have to take the lock before | |
| 5963 // verifying it. | |
| 5964 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 5965 _secondary_free_list.verify(); | |
| 5966 } | |
| 5967 _humongous_set.verify(); | |
| 5968 | |
| 5969 // If a concurrent region freeing operation is in progress it will | |
| 5970 // be difficult to correctly attributed any free regions we come | |
| 5971 // across to the correct free list given that they might belong to | |
| 5972 // one of several (free_list, secondary_free_list, any local lists, | |
| 5973 // etc.). So, if that's the case we will skip the rest of the | |
| 5974 // verification operation. Alternatively, waiting for the concurrent | |
| 5975 // operation to complete will have a non-trivial effect on the GC's | |
| 5976 // operation (no concurrent operation will last longer than the | |
| 5977 // interval between two calls to verification) and it might hide | |
| 5978 // any issues that we would like to catch during testing. | |
| 5979 if (free_regions_coming()) { | |
| 5980 return; | |
| 5981 } | |
| 5982 | |
| 2361 | 5983 // Make sure we append the secondary_free_list on the free_list so |
| 5984 // that all free regions we will come across can be safely | |
| 5985 // attributed to the free_list. | |
| 5986 append_secondary_free_list_if_not_empty_with_lock(); | |
| 2152 | 5987 |
| 5988 // Finally, make sure that the region accounting in the lists is | |
| 5989 // consistent with what we see in the heap. | |
| 5990 _humongous_set.verify_start(); | |
| 5991 _free_list.verify_start(); | |
| 5992 | |
| 5993 VerifyRegionListsClosure cl(&_humongous_set, &_free_list); | |
| 5994 heap_region_iterate(&cl); | |
| 5995 | |
| 5996 _humongous_set.verify_end(); | |
| 5997 _free_list.verify_end(); | |
| 342 | 5998 } |