Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 4708:3c648b9ad052
7121373: Clean up CollectedHeap::is_in
Summary: Fixed G1CollectedHeap::is_in, added tests, cleaned up comments and made Space::is_in pure virtual.
Reviewed-by: brutisso, tonyp, jcoomes
| author | stefank |
|---|---|
| date | Wed, 14 Dec 2011 12:15:26 +0100 |
| parents | dc467e8b2c5e |
| children | fd2b426c30db |
| 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 |
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69 // Notes on implementation of parallelism in different tasks. |
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70 // |
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71 // G1ParVerifyTask uses heap_region_par_iterate_chunked() for parallelism. |
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72 // The number of GC workers is passed to heap_region_par_iterate_chunked(). |
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73 // It does use run_task() which sets _n_workers in the task. |
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74 // G1ParTask executes g1_process_strong_roots() -> |
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75 // SharedHeap::process_strong_roots() which calls eventuall to |
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76 // CardTableModRefBS::par_non_clean_card_iterate_work() which uses |
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77 // SequentialSubTasksDone. SharedHeap::process_strong_roots() also |
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78 // directly uses SubTasksDone (_process_strong_tasks field in SharedHeap). |
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79 // |
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80 |
| 342 | 81 // Local to this file. |
| 82 | |
| 83 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
| 84 SuspendibleThreadSet* _sts; | |
| 85 G1RemSet* _g1rs; | |
| 86 ConcurrentG1Refine* _cg1r; | |
| 87 bool _concurrent; | |
| 88 public: | |
| 89 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
| 90 G1RemSet* g1rs, | |
| 91 ConcurrentG1Refine* cg1r) : | |
| 92 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
| 93 {} | |
| 94 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 1705 | 95 bool oops_into_cset = _g1rs->concurrentRefineOneCard(card_ptr, worker_i, false); |
| 96 // This path is executed by the concurrent refine or mutator threads, | |
| 97 // concurrently, and so we do not care if card_ptr contains references | |
| 98 // that point into the collection set. | |
| 99 assert(!oops_into_cset, "should be"); | |
| 100 | |
| 342 | 101 if (_concurrent && _sts->should_yield()) { |
| 102 // Caller will actually yield. | |
| 103 return false; | |
| 104 } | |
| 105 // Otherwise, we finished successfully; return true. | |
| 106 return true; | |
| 107 } | |
| 108 void set_concurrent(bool b) { _concurrent = b; } | |
| 109 }; | |
| 110 | |
| 111 | |
| 112 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 113 int _calls; | |
| 114 G1CollectedHeap* _g1h; | |
| 115 CardTableModRefBS* _ctbs; | |
| 116 int _histo[256]; | |
| 117 public: | |
| 118 ClearLoggedCardTableEntryClosure() : | |
| 119 _calls(0) | |
| 120 { | |
| 121 _g1h = G1CollectedHeap::heap(); | |
| 122 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 123 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
| 124 } | |
| 125 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 126 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 127 _calls++; | |
| 128 unsigned char* ujb = (unsigned char*)card_ptr; | |
| 129 int ind = (int)(*ujb); | |
| 130 _histo[ind]++; | |
| 131 *card_ptr = -1; | |
| 132 } | |
| 133 return true; | |
| 134 } | |
| 135 int calls() { return _calls; } | |
| 136 void print_histo() { | |
| 137 gclog_or_tty->print_cr("Card table value histogram:"); | |
| 138 for (int i = 0; i < 256; i++) { | |
| 139 if (_histo[i] != 0) { | |
| 140 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
| 141 } | |
| 142 } | |
| 143 } | |
| 144 }; | |
| 145 | |
| 146 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 147 int _calls; | |
| 148 G1CollectedHeap* _g1h; | |
| 149 CardTableModRefBS* _ctbs; | |
| 150 public: | |
| 151 RedirtyLoggedCardTableEntryClosure() : | |
| 152 _calls(0) | |
| 153 { | |
| 154 _g1h = G1CollectedHeap::heap(); | |
| 155 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 156 } | |
| 157 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 158 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 159 _calls++; | |
| 160 *card_ptr = 0; | |
| 161 } | |
| 162 return true; | |
| 163 } | |
| 164 int calls() { return _calls; } | |
| 165 }; | |
| 166 | |
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167 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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168 public: |
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169 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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170 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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171 return true; |
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172 } |
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173 }; |
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174 |
| 342 | 175 YoungList::YoungList(G1CollectedHeap* g1h) |
| 176 : _g1h(g1h), _head(NULL), | |
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177 _length(0), |
| 342 | 178 _last_sampled_rs_lengths(0), |
| 545 | 179 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) |
| 342 | 180 { |
| 181 guarantee( check_list_empty(false), "just making sure..." ); | |
| 182 } | |
| 183 | |
| 184 void YoungList::push_region(HeapRegion *hr) { | |
| 185 assert(!hr->is_young(), "should not already be young"); | |
| 186 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
| 187 | |
| 188 hr->set_next_young_region(_head); | |
| 189 _head = hr; | |
| 190 | |
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191 _g1h->g1_policy()->set_region_eden(hr, (int) _length); |
| 342 | 192 ++_length; |
| 193 } | |
| 194 | |
| 195 void YoungList::add_survivor_region(HeapRegion* hr) { | |
| 545 | 196 assert(hr->is_survivor(), "should be flagged as survivor region"); |
| 342 | 197 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
| 198 | |
| 199 hr->set_next_young_region(_survivor_head); | |
| 200 if (_survivor_head == NULL) { | |
| 545 | 201 _survivor_tail = hr; |
| 342 | 202 } |
| 203 _survivor_head = hr; | |
| 204 ++_survivor_length; | |
| 205 } | |
| 206 | |
| 207 void YoungList::empty_list(HeapRegion* list) { | |
| 208 while (list != NULL) { | |
| 209 HeapRegion* next = list->get_next_young_region(); | |
| 210 list->set_next_young_region(NULL); | |
| 211 list->uninstall_surv_rate_group(); | |
| 212 list->set_not_young(); | |
| 213 list = next; | |
| 214 } | |
| 215 } | |
| 216 | |
| 217 void YoungList::empty_list() { | |
| 218 assert(check_list_well_formed(), "young list should be well formed"); | |
| 219 | |
| 220 empty_list(_head); | |
| 221 _head = NULL; | |
| 222 _length = 0; | |
| 223 | |
| 224 empty_list(_survivor_head); | |
| 225 _survivor_head = NULL; | |
| 545 | 226 _survivor_tail = NULL; |
| 342 | 227 _survivor_length = 0; |
| 228 | |
| 229 _last_sampled_rs_lengths = 0; | |
| 230 | |
| 231 assert(check_list_empty(false), "just making sure..."); | |
| 232 } | |
| 233 | |
| 234 bool YoungList::check_list_well_formed() { | |
| 235 bool ret = true; | |
| 236 | |
| 237 size_t length = 0; | |
| 238 HeapRegion* curr = _head; | |
| 239 HeapRegion* last = NULL; | |
| 240 while (curr != NULL) { | |
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241 if (!curr->is_young()) { |
| 342 | 242 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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243 "incorrectly tagged (y: %d, surv: %d)", |
| 342 | 244 curr->bottom(), curr->end(), |
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245 curr->is_young(), curr->is_survivor()); |
| 342 | 246 ret = false; |
| 247 } | |
| 248 ++length; | |
| 249 last = curr; | |
| 250 curr = curr->get_next_young_region(); | |
| 251 } | |
| 252 ret = ret && (length == _length); | |
| 253 | |
| 254 if (!ret) { | |
| 255 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
| 256 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
| 257 length, _length); | |
| 258 } | |
| 259 | |
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260 return ret; |
| 342 | 261 } |
| 262 | |
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263 bool YoungList::check_list_empty(bool check_sample) { |
| 342 | 264 bool ret = true; |
| 265 | |
| 266 if (_length != 0) { | |
| 267 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
| 268 _length); | |
| 269 ret = false; | |
| 270 } | |
| 271 if (check_sample && _last_sampled_rs_lengths != 0) { | |
| 272 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
| 273 ret = false; | |
| 274 } | |
| 275 if (_head != NULL) { | |
| 276 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
| 277 ret = false; | |
| 278 } | |
| 279 if (!ret) { | |
| 280 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
| 281 } | |
| 282 | |
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283 return ret; |
| 342 | 284 } |
| 285 | |
| 286 void | |
| 287 YoungList::rs_length_sampling_init() { | |
| 288 _sampled_rs_lengths = 0; | |
| 289 _curr = _head; | |
| 290 } | |
| 291 | |
| 292 bool | |
| 293 YoungList::rs_length_sampling_more() { | |
| 294 return _curr != NULL; | |
| 295 } | |
| 296 | |
| 297 void | |
| 298 YoungList::rs_length_sampling_next() { | |
| 299 assert( _curr != NULL, "invariant" ); | |
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300 size_t rs_length = _curr->rem_set()->occupied(); |
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301 |
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302 _sampled_rs_lengths += rs_length; |
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303 |
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304 // The current region may not yet have been added to the |
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305 // incremental collection set (it gets added when it is |
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306 // retired as the current allocation region). |
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307 if (_curr->in_collection_set()) { |
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308 // Update the collection set policy information for this region |
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309 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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310 } |
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311 |
| 342 | 312 _curr = _curr->get_next_young_region(); |
| 313 if (_curr == NULL) { | |
| 314 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
| 315 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
| 316 } | |
| 317 } | |
| 318 | |
| 319 void | |
| 320 YoungList::reset_auxilary_lists() { | |
| 321 guarantee( is_empty(), "young list should be empty" ); | |
| 322 assert(check_list_well_formed(), "young list should be well formed"); | |
| 323 | |
| 324 // Add survivor regions to SurvRateGroup. | |
| 325 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
| 545 | 326 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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327 |
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328 int young_index_in_cset = 0; |
| 342 | 329 for (HeapRegion* curr = _survivor_head; |
| 330 curr != NULL; | |
| 331 curr = curr->get_next_young_region()) { | |
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332 _g1h->g1_policy()->set_region_survivor(curr, young_index_in_cset); |
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333 |
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334 // The region is a non-empty survivor so let's add it to |
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335 // the incremental collection set for the next evacuation |
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336 // pause. |
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337 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
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338 young_index_in_cset += 1; |
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339 } |
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340 assert((size_t) young_index_in_cset == _survivor_length, |
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341 "post-condition"); |
| 342 | 342 _g1h->g1_policy()->note_stop_adding_survivor_regions(); |
| 343 | |
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344 _head = _survivor_head; |
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345 _length = _survivor_length; |
| 342 | 346 if (_survivor_head != NULL) { |
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347 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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348 assert(_survivor_length > 0, "invariant"); |
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349 _survivor_tail->set_next_young_region(NULL); |
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350 } |
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351 |
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352 // Don't clear the survivor list handles until the start of |
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353 // the next evacuation pause - we need it in order to re-tag |
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354 // the survivor regions from this evacuation pause as 'young' |
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355 // at the start of the next. |
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356 |
| 545 | 357 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
| 342 | 358 |
| 359 assert(check_list_well_formed(), "young list should be well formed"); | |
| 360 } | |
| 361 | |
| 362 void YoungList::print() { | |
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363 HeapRegion* lists[] = {_head, _survivor_head}; |
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364 const char* names[] = {"YOUNG", "SURVIVOR"}; |
| 342 | 365 |
| 366 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
| 367 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
| 368 HeapRegion *curr = lists[list]; | |
| 369 if (curr == NULL) | |
| 370 gclog_or_tty->print_cr(" empty"); | |
| 371 while (curr != NULL) { | |
| 372 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
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373 "age: %4d, y: %d, surv: %d", |
| 342 | 374 curr->bottom(), curr->end(), |
| 375 curr->top(), | |
| 376 curr->prev_top_at_mark_start(), | |
| 377 curr->next_top_at_mark_start(), | |
| 378 curr->top_at_conc_mark_count(), | |
| 379 curr->age_in_surv_rate_group_cond(), | |
| 380 curr->is_young(), | |
| 381 curr->is_survivor()); | |
| 382 curr = curr->get_next_young_region(); | |
| 383 } | |
| 384 } | |
| 385 | |
| 386 gclog_or_tty->print_cr(""); | |
| 387 } | |
| 388 | |
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389 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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390 { |
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391 // Claim the right to put the region on the dirty cards region list |
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392 // by installing a self pointer. |
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393 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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394 if (next == NULL) { |
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395 HeapRegion* res = (HeapRegion*) |
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396 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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397 NULL); |
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398 if (res == NULL) { |
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399 HeapRegion* head; |
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400 do { |
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401 // Put the region to the dirty cards region list. |
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402 head = _dirty_cards_region_list; |
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403 next = (HeapRegion*) |
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404 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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405 if (next == head) { |
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406 assert(hr->get_next_dirty_cards_region() == hr, |
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407 "hr->get_next_dirty_cards_region() != hr"); |
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408 if (next == NULL) { |
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409 // The last region in the list points to itself. |
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410 hr->set_next_dirty_cards_region(hr); |
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411 } else { |
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412 hr->set_next_dirty_cards_region(next); |
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413 } |
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414 } |
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415 } while (next != head); |
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416 } |
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417 } |
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418 } |
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419 |
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420 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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421 { |
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422 HeapRegion* head; |
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423 HeapRegion* hr; |
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424 do { |
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425 head = _dirty_cards_region_list; |
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426 if (head == NULL) { |
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427 return NULL; |
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428 } |
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429 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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430 if (head == new_head) { |
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431 // The last region. |
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432 new_head = NULL; |
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433 } |
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434 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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435 head); |
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436 } while (hr != head); |
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437 assert(hr != NULL, "invariant"); |
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438 hr->set_next_dirty_cards_region(NULL); |
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439 return hr; |
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440 } |
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441 |
| 342 | 442 void G1CollectedHeap::stop_conc_gc_threads() { |
| 794 | 443 _cg1r->stop(); |
| 342 | 444 _cmThread->stop(); |
| 445 } | |
| 446 | |
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447 #ifdef ASSERT |
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448 // A region is added to the collection set as it is retired |
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449 // so an address p can point to a region which will be in the |
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450 // collection set but has not yet been retired. This method |
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451 // therefore is only accurate during a GC pause after all |
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452 // regions have been retired. It is used for debugging |
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453 // to check if an nmethod has references to objects that can |
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454 // be move during a partial collection. Though it can be |
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455 // inaccurate, it is sufficient for G1 because the conservative |
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456 // implementation of is_scavengable() for G1 will indicate that |
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457 // all nmethods must be scanned during a partial collection. |
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458 bool G1CollectedHeap::is_in_partial_collection(const void* p) { |
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459 HeapRegion* hr = heap_region_containing(p); |
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460 return hr != NULL && hr->in_collection_set(); |
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461 } |
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462 #endif |
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463 |
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464 // Returns true if the reference points to an object that |
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465 // can move in an incremental collecction. |
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466 bool G1CollectedHeap::is_scavengable(const void* p) { |
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467 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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468 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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469 HeapRegion* hr = heap_region_containing(p); |
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470 if (hr == NULL) { |
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471 // perm gen (or null) |
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472 return false; |
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473 } else { |
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474 return !hr->isHumongous(); |
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475 } |
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476 } |
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477 |
| 342 | 478 void G1CollectedHeap::check_ct_logs_at_safepoint() { |
| 479 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 480 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
| 481 | |
| 482 // Count the dirty cards at the start. | |
| 483 CountNonCleanMemRegionClosure count1(this); | |
| 484 ct_bs->mod_card_iterate(&count1); | |
| 485 int orig_count = count1.n(); | |
| 486 | |
| 487 // First clear the logged cards. | |
| 488 ClearLoggedCardTableEntryClosure clear; | |
| 489 dcqs.set_closure(&clear); | |
| 490 dcqs.apply_closure_to_all_completed_buffers(); | |
| 491 dcqs.iterate_closure_all_threads(false); | |
| 492 clear.print_histo(); | |
| 493 | |
| 494 // Now ensure that there's no dirty cards. | |
| 495 CountNonCleanMemRegionClosure count2(this); | |
| 496 ct_bs->mod_card_iterate(&count2); | |
| 497 if (count2.n() != 0) { | |
| 498 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
| 499 count2.n(), orig_count); | |
| 500 } | |
| 501 guarantee(count2.n() == 0, "Card table should be clean."); | |
| 502 | |
| 503 RedirtyLoggedCardTableEntryClosure redirty; | |
| 504 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
| 505 dcqs.apply_closure_to_all_completed_buffers(); | |
| 506 dcqs.iterate_closure_all_threads(false); | |
| 507 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
| 508 clear.calls(), orig_count); | |
| 509 guarantee(redirty.calls() == clear.calls(), | |
| 510 "Or else mechanism is broken."); | |
| 511 | |
| 512 CountNonCleanMemRegionClosure count3(this); | |
| 513 ct_bs->mod_card_iterate(&count3); | |
| 514 if (count3.n() != orig_count) { | |
| 515 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
| 516 orig_count, count3.n()); | |
| 517 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
| 518 } | |
| 519 | |
| 520 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 521 } | |
| 522 | |
| 523 // Private class members. | |
| 524 | |
| 525 G1CollectedHeap* G1CollectedHeap::_g1h; | |
| 526 | |
| 527 // Private methods. | |
| 528 | |
| 2152 | 529 HeapRegion* |
| 2361 | 530 G1CollectedHeap::new_region_try_secondary_free_list() { |
| 2152 | 531 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
| 532 while (!_secondary_free_list.is_empty() || free_regions_coming()) { | |
| 533 if (!_secondary_free_list.is_empty()) { | |
| 534 if (G1ConcRegionFreeingVerbose) { | |
| 535 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 536 "secondary_free_list has "SIZE_FORMAT" entries", | |
| 537 _secondary_free_list.length()); | |
| 538 } | |
| 539 // It looks as if there are free regions available on the | |
| 540 // secondary_free_list. Let's move them to the free_list and try | |
| 541 // again to allocate from it. | |
| 542 append_secondary_free_list(); | |
| 543 | |
| 544 assert(!_free_list.is_empty(), "if the secondary_free_list was not " | |
| 545 "empty we should have moved at least one entry to the free_list"); | |
| 546 HeapRegion* res = _free_list.remove_head(); | |
| 547 if (G1ConcRegionFreeingVerbose) { | |
| 548 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 549 "allocated "HR_FORMAT" from secondary_free_list", | |
| 550 HR_FORMAT_PARAMS(res)); | |
| 551 } | |
| 552 return res; | |
| 553 } | |
| 554 | |
| 555 // Wait here until we get notifed either when (a) there are no | |
| 556 // more free regions coming or (b) some regions have been moved on | |
| 557 // the secondary_free_list. | |
| 558 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 559 } | |
| 560 | |
| 561 if (G1ConcRegionFreeingVerbose) { | |
| 562 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 563 "could not allocate from secondary_free_list"); | |
| 564 } | |
| 565 return NULL; | |
| 566 } | |
| 567 | |
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568 HeapRegion* G1CollectedHeap::new_region(size_t word_size, bool do_expand) { |
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569 assert(!isHumongous(word_size) || word_size <= HeapRegion::GrainWords, |
| 2152 | 570 "the only time we use this to allocate a humongous region is " |
| 571 "when we are allocating a single humongous region"); | |
| 572 | |
| 573 HeapRegion* res; | |
| 574 if (G1StressConcRegionFreeing) { | |
| 575 if (!_secondary_free_list.is_empty()) { | |
| 576 if (G1ConcRegionFreeingVerbose) { | |
| 577 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 578 "forced to look at the secondary_free_list"); | |
| 579 } | |
| 2361 | 580 res = new_region_try_secondary_free_list(); |
| 2152 | 581 if (res != NULL) { |
| 582 return res; | |
| 583 } | |
| 584 } | |
| 585 } | |
| 586 res = _free_list.remove_head_or_null(); | |
| 587 if (res == NULL) { | |
| 588 if (G1ConcRegionFreeingVerbose) { | |
| 589 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 590 "res == NULL, trying the secondary_free_list"); | |
| 591 } | |
| 2361 | 592 res = new_region_try_secondary_free_list(); |
| 2152 | 593 } |
| 342 | 594 if (res == NULL && do_expand) { |
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595 ergo_verbose1(ErgoHeapSizing, |
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596 "attempt heap expansion", |
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597 ergo_format_reason("region allocation request failed") |
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598 ergo_format_byte("allocation request"), |
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599 word_size * HeapWordSize); |
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600 if (expand(word_size * HeapWordSize)) { |
| 3766 | 601 // Even though the heap was expanded, it might not have reached |
| 602 // the desired size. So, we cannot assume that the allocation | |
| 603 // will succeed. | |
| 604 res = _free_list.remove_head_or_null(); | |
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605 } |
| 342 | 606 } |
| 607 return res; | |
| 608 } | |
| 609 | |
| 3766 | 610 size_t G1CollectedHeap::humongous_obj_allocate_find_first(size_t num_regions, |
| 611 size_t word_size) { | |
| 2361 | 612 assert(isHumongous(word_size), "word_size should be humongous"); |
| 613 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
| 614 | |
| 3766 | 615 size_t first = G1_NULL_HRS_INDEX; |
| 2152 | 616 if (num_regions == 1) { |
| 617 // Only one region to allocate, no need to go through the slower | |
| 618 // path. The caller will attempt the expasion if this fails, so | |
| 619 // let's not try to expand here too. | |
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620 HeapRegion* hr = new_region(word_size, false /* do_expand */); |
| 2152 | 621 if (hr != NULL) { |
| 622 first = hr->hrs_index(); | |
| 623 } else { | |
| 3766 | 624 first = G1_NULL_HRS_INDEX; |
| 2152 | 625 } |
| 626 } else { | |
| 627 // We can't allocate humongous regions while cleanupComplete() is | |
| 628 // running, since some of the regions we find to be empty might not | |
| 629 // yet be added to the free list and it is not straightforward to | |
| 630 // know which list they are on so that we can remove them. Note | |
| 631 // that we only need to do this if we need to allocate more than | |
| 632 // one region to satisfy the current humongous allocation | |
| 633 // request. If we are only allocating one region we use the common | |
| 634 // region allocation code (see above). | |
| 635 wait_while_free_regions_coming(); | |
| 2361 | 636 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 637 |
| 638 if (free_regions() >= num_regions) { | |
| 3766 | 639 first = _hrs.find_contiguous(num_regions); |
| 640 if (first != G1_NULL_HRS_INDEX) { | |
| 641 for (size_t i = first; i < first + num_regions; ++i) { | |
| 642 HeapRegion* hr = region_at(i); | |
| 2152 | 643 assert(hr->is_empty(), "sanity"); |
| 2361 | 644 assert(is_on_master_free_list(hr), "sanity"); |
| 2152 | 645 hr->set_pending_removal(true); |
| 646 } | |
| 647 _free_list.remove_all_pending(num_regions); | |
| 648 } | |
| 649 } | |
| 650 } | |
| 651 return first; | |
| 652 } | |
| 653 | |
| 2361 | 654 HeapWord* |
| 3766 | 655 G1CollectedHeap::humongous_obj_allocate_initialize_regions(size_t first, |
| 2361 | 656 size_t num_regions, |
| 657 size_t word_size) { | |
| 3766 | 658 assert(first != G1_NULL_HRS_INDEX, "pre-condition"); |
| 2361 | 659 assert(isHumongous(word_size), "word_size should be humongous"); |
| 660 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
| 661 | |
| 662 // Index of last region in the series + 1. | |
| 3766 | 663 size_t last = first + num_regions; |
| 2361 | 664 |
| 665 // We need to initialize the region(s) we just discovered. This is | |
| 666 // a bit tricky given that it can happen concurrently with | |
| 667 // refinement threads refining cards on these regions and | |
| 668 // potentially wanting to refine the BOT as they are scanning | |
| 669 // those cards (this can happen shortly after a cleanup; see CR | |
| 670 // 6991377). So we have to set up the region(s) carefully and in | |
| 671 // a specific order. | |
| 672 | |
| 673 // The word size sum of all the regions we will allocate. | |
| 674 size_t word_size_sum = num_regions * HeapRegion::GrainWords; | |
| 675 assert(word_size <= word_size_sum, "sanity"); | |
| 676 | |
| 677 // This will be the "starts humongous" region. | |
| 3766 | 678 HeapRegion* first_hr = region_at(first); |
| 2361 | 679 // The header of the new object will be placed at the bottom of |
| 680 // the first region. | |
| 681 HeapWord* new_obj = first_hr->bottom(); | |
| 682 // This will be the new end of the first region in the series that | |
| 683 // should also match the end of the last region in the seriers. | |
| 684 HeapWord* new_end = new_obj + word_size_sum; | |
| 685 // This will be the new top of the first region that will reflect | |
| 686 // this allocation. | |
| 687 HeapWord* new_top = new_obj + word_size; | |
| 688 | |
| 689 // First, we need to zero the header of the space that we will be | |
| 690 // allocating. When we update top further down, some refinement | |
| 691 // threads might try to scan the region. By zeroing the header we | |
| 692 // ensure that any thread that will try to scan the region will | |
| 693 // come across the zero klass word and bail out. | |
| 694 // | |
| 695 // NOTE: It would not have been correct to have used | |
| 696 // CollectedHeap::fill_with_object() and make the space look like | |
| 697 // an int array. The thread that is doing the allocation will | |
| 698 // later update the object header to a potentially different array | |
| 699 // type and, for a very short period of time, the klass and length | |
| 700 // fields will be inconsistent. This could cause a refinement | |
| 701 // thread to calculate the object size incorrectly. | |
| 702 Copy::fill_to_words(new_obj, oopDesc::header_size(), 0); | |
| 703 | |
| 704 // We will set up the first region as "starts humongous". This | |
| 705 // will also update the BOT covering all the regions to reflect | |
| 706 // that there is a single object that starts at the bottom of the | |
| 707 // first region. | |
| 708 first_hr->set_startsHumongous(new_top, new_end); | |
| 709 | |
| 710 // Then, if there are any, we will set up the "continues | |
| 711 // humongous" regions. | |
| 712 HeapRegion* hr = NULL; | |
| 3766 | 713 for (size_t i = first + 1; i < last; ++i) { |
| 714 hr = region_at(i); | |
| 2361 | 715 hr->set_continuesHumongous(first_hr); |
| 716 } | |
| 717 // If we have "continues humongous" regions (hr != NULL), then the | |
| 718 // end of the last one should match new_end. | |
| 719 assert(hr == NULL || hr->end() == new_end, "sanity"); | |
| 720 | |
| 721 // Up to this point no concurrent thread would have been able to | |
| 722 // do any scanning on any region in this series. All the top | |
| 723 // fields still point to bottom, so the intersection between | |
| 724 // [bottom,top] and [card_start,card_end] will be empty. Before we | |
| 725 // update the top fields, we'll do a storestore to make sure that | |
| 726 // no thread sees the update to top before the zeroing of the | |
| 727 // object header and the BOT initialization. | |
| 728 OrderAccess::storestore(); | |
| 729 | |
| 730 // Now that the BOT and the object header have been initialized, | |
| 731 // we can update top of the "starts humongous" region. | |
| 732 assert(first_hr->bottom() < new_top && new_top <= first_hr->end(), | |
| 733 "new_top should be in this region"); | |
| 734 first_hr->set_top(new_top); | |
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735 if (_hr_printer.is_active()) { |
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736 HeapWord* bottom = first_hr->bottom(); |
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737 HeapWord* end = first_hr->orig_end(); |
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738 if ((first + 1) == last) { |
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739 // the series has a single humongous region |
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740 _hr_printer.alloc(G1HRPrinter::SingleHumongous, first_hr, new_top); |
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741 } else { |
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742 // the series has more than one humongous regions |
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743 _hr_printer.alloc(G1HRPrinter::StartsHumongous, first_hr, end); |
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744 } |
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745 } |
| 2361 | 746 |
| 747 // Now, we will update the top fields of the "continues humongous" | |
| 748 // regions. The reason we need to do this is that, otherwise, | |
| 749 // these regions would look empty and this will confuse parts of | |
| 750 // G1. For example, the code that looks for a consecutive number | |
| 751 // of empty regions will consider them empty and try to | |
| 752 // re-allocate them. We can extend is_empty() to also include | |
| 753 // !continuesHumongous(), but it is easier to just update the top | |
| 754 // fields here. The way we set top for all regions (i.e., top == | |
| 755 // end for all regions but the last one, top == new_top for the | |
| 756 // last one) is actually used when we will free up the humongous | |
| 757 // region in free_humongous_region(). | |
| 758 hr = NULL; | |
| 3766 | 759 for (size_t i = first + 1; i < last; ++i) { |
| 760 hr = region_at(i); | |
| 2361 | 761 if ((i + 1) == last) { |
| 762 // last continues humongous region | |
| 763 assert(hr->bottom() < new_top && new_top <= hr->end(), | |
| 764 "new_top should fall on this region"); | |
| 765 hr->set_top(new_top); | |
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766 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, new_top); |
| 2361 | 767 } else { |
| 768 // not last one | |
| 769 assert(new_top > hr->end(), "new_top should be above this region"); | |
| 770 hr->set_top(hr->end()); | |
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771 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, hr->end()); |
| 2361 | 772 } |
| 773 } | |
| 774 // If we have continues humongous regions (hr != NULL), then the | |
| 775 // end of the last one should match new_end and its top should | |
| 776 // match new_top. | |
| 777 assert(hr == NULL || | |
| 778 (hr->end() == new_end && hr->top() == new_top), "sanity"); | |
| 779 | |
| 780 assert(first_hr->used() == word_size * HeapWordSize, "invariant"); | |
| 781 _summary_bytes_used += first_hr->used(); | |
| 782 _humongous_set.add(first_hr); | |
| 783 | |
| 784 return new_obj; | |
| 785 } | |
| 786 | |
| 342 | 787 // If could fit into free regions w/o expansion, try. |
| 788 // Otherwise, if can expand, do so. | |
| 789 // Otherwise, if using ex regions might help, try with ex given back. | |
| 1973 | 790 HeapWord* G1CollectedHeap::humongous_obj_allocate(size_t word_size) { |
| 2152 | 791 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
| 792 | |
| 793 verify_region_sets_optional(); | |
| 342 | 794 |
| 795 size_t num_regions = | |
| 1973 | 796 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; |
| 342 | 797 size_t x_size = expansion_regions(); |
| 3766 | 798 size_t fs = _hrs.free_suffix(); |
| 799 size_t first = humongous_obj_allocate_find_first(num_regions, word_size); | |
| 800 if (first == G1_NULL_HRS_INDEX) { | |
| 2152 | 801 // The only thing we can do now is attempt expansion. |
| 342 | 802 if (fs + x_size >= num_regions) { |
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803 // If the number of regions we're trying to allocate for this |
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804 // object is at most the number of regions in the free suffix, |
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805 // then the call to humongous_obj_allocate_find_first() above |
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806 // should have succeeded and we wouldn't be here. |
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807 // |
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808 // We should only be trying to expand when the free suffix is |
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809 // not sufficient for the object _and_ we have some expansion |
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810 // room available. |
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811 assert(num_regions > fs, "earlier allocation should have succeeded"); |
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812 |
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813 ergo_verbose1(ErgoHeapSizing, |
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814 "attempt heap expansion", |
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815 ergo_format_reason("humongous allocation request failed") |
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816 ergo_format_byte("allocation request"), |
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817 word_size * HeapWordSize); |
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818 if (expand((num_regions - fs) * HeapRegion::GrainBytes)) { |
| 3766 | 819 // Even though the heap was expanded, it might not have |
| 820 // reached the desired size. So, we cannot assume that the | |
| 821 // allocation will succeed. | |
|
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
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2173
diff
changeset
|
822 first = humongous_obj_allocate_find_first(num_regions, word_size); |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
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2173
diff
changeset
|
823 } |
| 2152 | 824 } |
| 825 } | |
| 826 | |
| 2361 | 827 HeapWord* result = NULL; |
| 3766 | 828 if (first != G1_NULL_HRS_INDEX) { |
| 2361 | 829 result = |
| 830 humongous_obj_allocate_initialize_regions(first, num_regions, word_size); | |
| 831 assert(result != NULL, "it should always return a valid result"); | |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
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|
832 |
|
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
833 // A successful humongous object allocation changes the used space |
|
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
834 // information of the old generation so we need to recalculate the |
|
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
835 // sizes and update the jstat counters here. |
|
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
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parents:
3979
diff
changeset
|
836 g1mm()->update_sizes(); |
| 2152 | 837 } |
| 838 | |
| 839 verify_region_sets_optional(); | |
| 2361 | 840 |
| 841 return result; | |
| 342 | 842 } |
| 843 | |
| 1973 | 844 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
| 845 assert_heap_not_locked_and_not_at_safepoint(); | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
846 assert(!isHumongous(word_size), "we do not allow humongous TLABs"); |
|
abdfc822206f
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tonyp
parents:
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|
847 |
|
abdfc822206f
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parents:
2432
diff
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|
848 unsigned int dummy_gc_count_before; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
diff
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|
849 return attempt_allocation(word_size, &dummy_gc_count_before); |
| 342 | 850 } |
| 851 | |
| 852 HeapWord* | |
| 853 G1CollectedHeap::mem_allocate(size_t word_size, | |
| 1973 | 854 bool* gc_overhead_limit_was_exceeded) { |
| 855 assert_heap_not_locked_and_not_at_safepoint(); | |
| 342 | 856 |
|
2433
abdfc822206f
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2432
diff
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|
857 // Loop until the allocation is satisified, or unsatisfied after GC. |
| 1973 | 858 for (int try_count = 1; /* we'll return */; try_count += 1) { |
| 859 unsigned int gc_count_before; | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
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|
860 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
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|
861 HeapWord* result = NULL; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
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diff
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|
862 if (!isHumongous(word_size)) { |
|
abdfc822206f
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diff
changeset
|
863 result = attempt_allocation(word_size, &gc_count_before); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
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|
864 } else { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
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|
865 result = attempt_allocation_humongous(word_size, &gc_count_before); |
|
abdfc822206f
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tonyp
parents:
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|
866 } |
|
abdfc822206f
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tonyp
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diff
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|
867 if (result != NULL) { |
|
abdfc822206f
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|
868 return result; |
| 342 | 869 } |
| 870 | |
| 871 // Create the garbage collection operation... | |
| 1973 | 872 VM_G1CollectForAllocation op(gc_count_before, word_size); |
| 342 | 873 // ...and get the VM thread to execute it. |
| 874 VMThread::execute(&op); | |
| 1973 | 875 |
| 876 if (op.prologue_succeeded() && op.pause_succeeded()) { | |
| 877 // If the operation was successful we'll return the result even | |
| 878 // if it is NULL. If the allocation attempt failed immediately | |
| 879 // after a Full GC, it's unlikely we'll be able to allocate now. | |
| 880 HeapWord* result = op.result(); | |
| 881 if (result != NULL && !isHumongous(word_size)) { | |
| 882 // Allocations that take place on VM operations do not do any | |
| 883 // card dirtying and we have to do it here. We only have to do | |
| 884 // this for non-humongous allocations, though. | |
| 885 dirty_young_block(result, word_size); | |
| 886 } | |
| 342 | 887 return result; |
| 1973 | 888 } else { |
| 889 assert(op.result() == NULL, | |
| 890 "the result should be NULL if the VM op did not succeed"); | |
| 342 | 891 } |
| 892 | |
| 893 // Give a warning if we seem to be looping forever. | |
| 894 if ((QueuedAllocationWarningCount > 0) && | |
| 895 (try_count % QueuedAllocationWarningCount == 0)) { | |
| 1973 | 896 warning("G1CollectedHeap::mem_allocate retries %d times", try_count); |
| 342 | 897 } |
| 898 } | |
| 1973 | 899 |
| 900 ShouldNotReachHere(); | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
901 return NULL; |
| 342 | 902 } |
| 903 | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
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|
904 HeapWord* G1CollectedHeap::attempt_allocation_slow(size_t word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
905 unsigned int *gc_count_before_ret) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
906 // Make sure you read the note in attempt_allocation_humongous(). |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
907 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
908 assert_heap_not_locked_and_not_at_safepoint(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
909 assert(!isHumongous(word_size), "attempt_allocation_slow() should not " |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
910 "be called for humongous allocation requests"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
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|
911 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
912 // We should only get here after the first-level allocation attempt |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
913 // (attempt_allocation()) failed to allocate. |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
914 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
915 // We will loop until a) we manage to successfully perform the |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
916 // allocation or b) we successfully schedule a collection which |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
917 // fails to perform the allocation. b) is the only case when we'll |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
918 // return NULL. |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
919 HeapWord* result = NULL; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
920 for (int try_count = 1; /* we'll return */; try_count += 1) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
921 bool should_try_gc; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
922 unsigned int gc_count_before; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
923 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
924 { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
925 MutexLockerEx x(Heap_lock); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
926 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
927 result = _mutator_alloc_region.attempt_allocation_locked(word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
928 false /* bot_updates */); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
929 if (result != NULL) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
930 return result; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
931 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
932 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
933 // If we reach here, attempt_allocation_locked() above failed to |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
934 // allocate a new region. So the mutator alloc region should be NULL. |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
935 assert(_mutator_alloc_region.get() == NULL, "only way to get here"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
936 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
937 if (GC_locker::is_active_and_needs_gc()) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
938 if (g1_policy()->can_expand_young_list()) { |
|
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3886
diff
changeset
|
939 // 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
|
940 // can_expand_young_list() does this when it returns true. |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
941 result = _mutator_alloc_region.attempt_allocation_force(word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
942 false /* bot_updates */); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
943 if (result != NULL) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
944 return result; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
945 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
946 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
947 should_try_gc = false; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
948 } else { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
949 // Read the GC count while still holding the Heap_lock. |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
950 gc_count_before = SharedHeap::heap()->total_collections(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
951 should_try_gc = true; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
952 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
953 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
954 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
955 if (should_try_gc) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
956 bool succeeded; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
957 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
958 if (result != NULL) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
959 assert(succeeded, "only way to get back a non-NULL result"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
960 return result; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
961 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
962 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
963 if (succeeded) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
964 // If we get here we successfully scheduled a collection which |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
965 // failed to allocate. No point in trying to allocate |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
966 // further. We'll just return NULL. |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
967 MutexLockerEx x(Heap_lock); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
968 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
969 return NULL; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
970 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
971 } else { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
972 GC_locker::stall_until_clear(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
973 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
974 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
975 // We can reach here if we were unsuccessul in scheduling a |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
976 // collection (because another thread beat us to it) or if we were |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
977 // stalled due to the GC locker. In either can we should retry the |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
978 // allocation attempt in case another thread successfully |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
979 // performed a collection and reclaimed enough space. We do the |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
980 // first attempt (without holding the Heap_lock) here and the |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
981 // follow-on attempt will be at the start of the next loop |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
982 // iteration (after taking the Heap_lock). |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
983 result = _mutator_alloc_region.attempt_allocation(word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
984 false /* bot_updates */); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
985 if (result != NULL ){ |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
986 return result; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
987 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
988 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
989 // Give a warning if we seem to be looping forever. |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
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|
990 if ((QueuedAllocationWarningCount > 0) && |
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991 (try_count % QueuedAllocationWarningCount == 0)) { |
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992 warning("G1CollectedHeap::attempt_allocation_slow() " |
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993 "retries %d times", try_count); |
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994 } |
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995 } |
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996 |
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997 ShouldNotReachHere(); |
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998 return NULL; |
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999 } |
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1000 |
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1001 HeapWord* G1CollectedHeap::attempt_allocation_humongous(size_t word_size, |
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1002 unsigned int * gc_count_before_ret) { |
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1003 // The structure of this method has a lot of similarities to |
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1004 // attempt_allocation_slow(). The reason these two were not merged |
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1005 // into a single one is that such a method would require several "if |
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1006 // allocation is not humongous do this, otherwise do that" |
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1007 // conditional paths which would obscure its flow. In fact, an early |
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1008 // version of this code did use a unified method which was harder to |
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1009 // follow and, as a result, it had subtle bugs that were hard to |
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1010 // track down. So keeping these two methods separate allows each to |
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1011 // be more readable. It will be good to keep these two in sync as |
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1012 // much as possible. |
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1013 |
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1014 assert_heap_not_locked_and_not_at_safepoint(); |
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1015 assert(isHumongous(word_size), "attempt_allocation_humongous() " |
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1016 "should only be called for humongous allocations"); |
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1017 |
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1018 // We will loop until a) we manage to successfully perform the |
|
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1019 // allocation or b) we successfully schedule a collection which |
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1020 // fails to perform the allocation. b) is the only case when we'll |
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1021 // return NULL. |
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1022 HeapWord* result = NULL; |
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1023 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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1024 bool should_try_gc; |
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1025 unsigned int gc_count_before; |
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1026 |
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1027 { |
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1028 MutexLockerEx x(Heap_lock); |
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1029 |
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1030 // Given that humongous objects are not allocated in young |
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1031 // regions, we'll first try to do the allocation without doing a |
|
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1032 // collection hoping that there's enough space in the heap. |
|
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1033 result = humongous_obj_allocate(word_size); |
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1034 if (result != NULL) { |
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1035 return result; |
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1036 } |
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1037 |
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1038 if (GC_locker::is_active_and_needs_gc()) { |
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1039 should_try_gc = false; |
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1040 } else { |
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1041 // Read the GC count while still holding the Heap_lock. |
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1042 gc_count_before = SharedHeap::heap()->total_collections(); |
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1043 should_try_gc = true; |
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1044 } |
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1045 } |
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1046 |
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1047 if (should_try_gc) { |
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1048 // If we failed to allocate the humongous object, we should try to |
|
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1049 // do a collection pause (if we're allowed) in case it reclaims |
|
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1050 // enough space for the allocation to succeed after the pause. |
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1051 |
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1052 bool succeeded; |
|
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1053 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
|
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1054 if (result != NULL) { |
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1055 assert(succeeded, "only way to get back a non-NULL result"); |
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1056 return result; |
|
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1057 } |
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1058 |
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1059 if (succeeded) { |
|
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1060 // If we get here we successfully scheduled a collection which |
|
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1061 // failed to allocate. No point in trying to allocate |
|
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1062 // further. We'll just return NULL. |
|
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1063 MutexLockerEx x(Heap_lock); |
|
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1064 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
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1065 return NULL; |
|
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1066 } |
|
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1067 } else { |
|
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1068 GC_locker::stall_until_clear(); |
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1069 } |
|
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1070 |
|
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1071 // We can reach here if we were unsuccessul in scheduling a |
|
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1072 // collection (because another thread beat us to it) or if we were |
|
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1073 // stalled due to the GC locker. In either can we should retry the |
|
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1074 // allocation attempt in case another thread successfully |
|
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1075 // performed a collection and reclaimed enough space. Give a |
|
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1076 // warning if we seem to be looping forever. |
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1077 |
|
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1078 if ((QueuedAllocationWarningCount > 0) && |
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1079 (try_count % QueuedAllocationWarningCount == 0)) { |
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1080 warning("G1CollectedHeap::attempt_allocation_humongous() " |
|
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1081 "retries %d times", try_count); |
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1082 } |
|
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1083 } |
|
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1084 |
|
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1085 ShouldNotReachHere(); |
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1086 return NULL; |
|
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1087 } |
|
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1088 |
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1089 HeapWord* G1CollectedHeap::attempt_allocation_at_safepoint(size_t word_size, |
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1090 bool expect_null_mutator_alloc_region) { |
| 2152 | 1091 assert_at_safepoint(true /* should_be_vm_thread */); |
|
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1092 assert(_mutator_alloc_region.get() == NULL || |
|
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1093 !expect_null_mutator_alloc_region, |
|
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1094 "the current alloc region was unexpectedly found to be non-NULL"); |
|
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1095 |
|
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1096 if (!isHumongous(word_size)) { |
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1097 return _mutator_alloc_region.attempt_allocation_locked(word_size, |
|
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1098 false /* bot_updates */); |
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1099 } else { |
|
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1100 return humongous_obj_allocate(word_size); |
|
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1101 } |
|
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1102 |
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1103 ShouldNotReachHere(); |
| 342 | 1104 } |
| 1105 | |
| 1106 class PostMCRemSetClearClosure: public HeapRegionClosure { | |
| 1107 ModRefBarrierSet* _mr_bs; | |
| 1108 public: | |
| 1109 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 1110 bool doHeapRegion(HeapRegion* r) { | |
| 1111 r->reset_gc_time_stamp(); | |
| 1112 if (r->continuesHumongous()) | |
| 1113 return false; | |
| 1114 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 1115 if (hrrs != NULL) hrrs->clear(); | |
| 1116 // You might think here that we could clear just the cards | |
| 1117 // corresponding to the used region. But no: if we leave a dirty card | |
| 1118 // in a region we might allocate into, then it would prevent that card | |
| 1119 // from being enqueued, and cause it to be missed. | |
| 1120 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
| 1121 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
| 1122 return false; | |
| 1123 } | |
| 1124 }; | |
| 1125 | |
| 1126 | |
| 1127 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
| 1128 ModRefBarrierSet* _mr_bs; | |
| 1129 public: | |
| 1130 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 1131 bool doHeapRegion(HeapRegion* r) { | |
| 1132 if (r->continuesHumongous()) return false; | |
| 1133 if (r->used_region().word_size() != 0) { | |
| 1134 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
| 1135 } | |
| 1136 return false; | |
| 1137 } | |
| 1138 }; | |
| 1139 | |
|
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1140 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
|
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1141 G1CollectedHeap* _g1h; |
|
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1142 UpdateRSOopClosure _cl; |
|
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|
1143 int _worker_i; |
|
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|
1144 public: |
|
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|
1145 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
| 1861 | 1146 _cl(g1->g1_rem_set(), worker_i), |
|
626
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|
1147 _worker_i(worker_i), |
|
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|
1148 _g1h(g1) |
|
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|
1149 { } |
|
1960
878b57474103
6978187: G1: assert(ParallelGCThreads> 1 || n_yielded() == _hrrs->occupied()) strikes again
johnc
parents:
1883
diff
changeset
|
1150 |
|
626
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|
1151 bool doHeapRegion(HeapRegion* r) { |
|
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1152 if (!r->continuesHumongous()) { |
|
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|
1153 _cl.set_from(r); |
|
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|
1154 r->oop_iterate(&_cl); |
|
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|
1155 } |
|
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|
1156 return false; |
|
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|
1157 } |
|
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|
1158 }; |
|
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|
1159 |
|
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|
1160 class ParRebuildRSTask: public AbstractGangTask { |
|
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1161 G1CollectedHeap* _g1; |
|
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1162 public: |
|
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|
1163 ParRebuildRSTask(G1CollectedHeap* g1) |
|
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1164 : AbstractGangTask("ParRebuildRSTask"), |
|
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|
1165 _g1(g1) |
|
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|
1166 { } |
|
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|
1167 |
|
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|
1168 void work(int i) { |
|
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|
1169 RebuildRSOutOfRegionClosure rebuild_rs(_g1, i); |
|
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|
1170 _g1->heap_region_par_iterate_chunked(&rebuild_rs, i, |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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|
1171 _g1->workers()->active_workers(), |
|
626
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1172 HeapRegion::RebuildRSClaimValue); |
|
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1173 } |
|
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1174 }; |
|
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|
1175 |
|
3778
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|
1176 class PostCompactionPrinterClosure: public HeapRegionClosure { |
|
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1177 private: |
|
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|
1178 G1HRPrinter* _hr_printer; |
|
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|
1179 public: |
|
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|
1180 bool doHeapRegion(HeapRegion* hr) { |
|
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|
1181 assert(!hr->is_young(), "not expecting to find young regions"); |
|
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|
1182 // We only generate output for non-empty regions. |
|
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1183 if (!hr->is_empty()) { |
|
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1184 if (!hr->isHumongous()) { |
|
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|
1185 _hr_printer->post_compaction(hr, G1HRPrinter::Old); |
|
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|
1186 } else if (hr->startsHumongous()) { |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3983
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changeset
|
1187 if (hr->capacity() == HeapRegion::GrainBytes) { |
|
3778
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1188 // single humongous region |
|
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|
1189 _hr_printer->post_compaction(hr, G1HRPrinter::SingleHumongous); |
|
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|
1190 } else { |
|
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|
1191 _hr_printer->post_compaction(hr, G1HRPrinter::StartsHumongous); |
|
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1192 } |
|
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1193 } else { |
|
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|
1194 assert(hr->continuesHumongous(), "only way to get here"); |
|
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|
1195 _hr_printer->post_compaction(hr, G1HRPrinter::ContinuesHumongous); |
|
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|
1196 } |
|
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|
1197 } |
|
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|
1198 return false; |
|
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|
1199 } |
|
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|
1200 |
|
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|
1201 PostCompactionPrinterClosure(G1HRPrinter* hr_printer) |
|
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|
1202 : _hr_printer(hr_printer) { } |
|
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|
1203 }; |
|
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|
1204 |
| 1973 | 1205 bool G1CollectedHeap::do_collection(bool explicit_gc, |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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parents:
1611
diff
changeset
|
1206 bool clear_all_soft_refs, |
| 342 | 1207 size_t word_size) { |
| 2152 | 1208 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1209 | |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
1210 if (GC_locker::check_active_before_gc()) { |
| 1973 | 1211 return false; |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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|
1212 } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
1213 |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2039
diff
changeset
|
1214 SvcGCMarker sgcm(SvcGCMarker::FULL); |
| 342 | 1215 ResourceMark rm; |
| 1216 | |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
changeset
|
1217 if (PrintHeapAtGC) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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changeset
|
1218 Universe::print_heap_before_gc(); |
|
0316eac49d5a
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|
1219 } |
|
0316eac49d5a
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|
1220 |
| 4072 | 1221 HRSPhaseSetter x(HRSPhaseFullGC); |
| 2152 | 1222 verify_region_sets_optional(); |
| 342 | 1223 |
|
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
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1360
diff
changeset
|
1224 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
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1360
diff
changeset
|
1225 collector_policy()->should_clear_all_soft_refs(); |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
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1360
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|
1226 |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
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1360
diff
changeset
|
1227 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
|
0bfd3fb24150
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|
1228 |
| 342 | 1229 { |
| 1230 IsGCActiveMark x; | |
| 1231 | |
| 1232 // Timing | |
|
1656
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diff
changeset
|
1233 bool system_gc = (gc_cause() == GCCause::_java_lang_system_gc); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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changeset
|
1234 assert(!system_gc || explicit_gc, "invariant"); |
| 342 | 1235 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
| 1236 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
changeset
|
1237 TraceTime t(system_gc ? "Full GC (System.gc())" : "Full GC", |
|
1387
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diff
changeset
|
1238 PrintGC, true, gclog_or_tty); |
| 342 | 1239 |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
1240 TraceCollectorStats tcs(g1mm()->full_collection_counters()); |
|
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
1241 TraceMemoryManagerStats tms(true /* fullGC */, gc_cause()); |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
1242 |
| 342 | 1243 double start = os::elapsedTime(); |
| 1244 g1_policy()->record_full_collection_start(); | |
| 1245 | |
| 2152 | 1246 wait_while_free_regions_coming(); |
| 2361 | 1247 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 1248 |
| 342 | 1249 gc_prologue(true); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
1250 increment_total_collections(true /* full gc */); |
| 342 | 1251 |
| 1252 size_t g1h_prev_used = used(); | |
| 1253 assert(used() == recalculate_used(), "Should be equal"); | |
| 1254 | |
| 1255 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
| 1256 HandleMark hm; // Discard invalid handles created during verification | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
1257 gclog_or_tty->print(" VerifyBeforeGC:"); |
| 342 | 1258 prepare_for_verify(); |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3766
diff
changeset
|
1259 Universe::verify(/* allow dirty */ true, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
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changeset
|
1260 /* silent */ false, |
|
6747fd0512e0
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johnc
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changeset
|
1261 /* option */ VerifyOption_G1UsePrevMarking); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
changeset
|
1262 |
| 342 | 1263 } |
|
3869
7f776886a215
6810861: G1: support -XX:+{PrintClassHistogram,HeapDump}{Before,After}FullGC
ysr
parents:
3867
diff
changeset
|
1264 pre_full_gc_dump(); |
| 342 | 1265 |
| 1266 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 1267 | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1268 // Disable discovery and empty the discovered lists |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1269 // for the CM ref processor. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1270 ref_processor_cm()->disable_discovery(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
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changeset
|
1271 ref_processor_cm()->abandon_partial_discovery(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
1272 ref_processor_cm()->verify_no_references_recorded(); |
| 342 | 1273 |
| 1274 // Abandon current iterations of concurrent marking and concurrent | |
| 1275 // refinement, if any are in progress. | |
| 1276 concurrent_mark()->abort(); | |
| 1277 | |
| 1278 // Make sure we'll choose a new allocation region afterwards. | |
|
2433
abdfc822206f
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tonyp
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diff
changeset
|
1279 release_mutator_alloc_region(); |
| 636 | 1280 abandon_gc_alloc_regions(); |
| 1861 | 1281 g1_rem_set()->cleanupHRRS(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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changeset
|
1282 |
|
3778
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|
1283 // We should call this after we retire any currently active alloc |
|
5f6f2615433a
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|
1284 // regions so that all the ALLOC / RETIRE events are generated |
|
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|
1285 // before the start GC event. |
|
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|
1286 _hr_printer.start_gc(true /* full */, (size_t) total_collections()); |
|
5f6f2615433a
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|
1287 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1288 // We may have added regions to the current incremental collection |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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1391
diff
changeset
|
1289 // set between the last GC or pause and now. We need to clear the |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1290 // incremental collection set and then start rebuilding it afresh |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1291 // after this full GC. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
1292 abandon_collection_set(g1_policy()->inc_cset_head()); |
|
1316cec51b4d
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1293 g1_policy()->clear_incremental_cset(); |
|
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|
1294 g1_policy()->stop_incremental_cset_building(); |
|
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|
1295 |
| 4072 | 1296 tear_down_region_sets(false /* free_list_only */); |
|
3867
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|
1297 g1_policy()->set_full_young_gcs(true); |
| 342 | 1298 |
|
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1299 // See the comments in g1CollectedHeap.hpp and |
|
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1300 // G1CollectedHeap::ref_processing_init() about |
|
1974
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|
1301 // how reference processing currently works in G1. |
|
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|
1302 |
|
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|
1303 // Temporarily make discovery by the STW ref processor single threaded (non-MT). |
|
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|
1304 ReferenceProcessorMTDiscoveryMutator stw_rp_disc_ser(ref_processor_stw(), false); |
|
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|
1305 |
|
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|
1306 // Temporarily clear the STW ref processor's _is_alive_non_header field. |
|
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|
1307 ReferenceProcessorIsAliveMutator stw_rp_is_alive_null(ref_processor_stw(), NULL); |
|
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|
1308 |
|
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|
1309 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
|
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|
1310 ref_processor_stw()->setup_policy(do_clear_all_soft_refs); |
|
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|
1311 |
| 342 | 1312 // Do collection work |
| 1313 { | |
| 1314 HandleMark hm; // Discard invalid handles created during gc | |
|
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|
1315 G1MarkSweep::invoke_at_safepoint(ref_processor_stw(), do_clear_all_soft_refs); |
| 342 | 1316 } |
|
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|
1317 |
| 2152 | 1318 assert(free_regions() == 0, "we should not have added any free regions"); |
| 4072 | 1319 rebuild_region_sets(false /* free_list_only */); |
| 342 | 1320 |
|
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|
1321 // Enqueue any discovered reference objects that have |
|
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|
1322 // not been removed from the discovered lists. |
|
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|
1323 ref_processor_stw()->enqueue_discovered_references(); |
| 342 | 1324 |
| 1325 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 1326 | |
|
1089
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|
1327 MemoryService::track_memory_usage(); |
|
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|
1328 |
| 342 | 1329 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
| 1330 HandleMark hm; // Discard invalid handles created during verification | |
| 1331 gclog_or_tty->print(" VerifyAfterGC:"); | |
|
637
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|
1332 prepare_for_verify(); |
|
3772
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|
1333 Universe::verify(/* allow dirty */ false, |
|
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|
1334 /* silent */ false, |
|
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|
1335 /* option */ VerifyOption_G1UsePrevMarking); |
|
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|
1336 |
| 342 | 1337 } |
|
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|
1338 |
|
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|
1339 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
|
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|
1340 ref_processor_stw()->verify_no_references_recorded(); |
|
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|
1341 |
|
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|
1342 // Note: since we've just done a full GC, concurrent |
|
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|
1343 // marking is no longer active. Therefore we need not |
|
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|
1344 // re-enable reference discovery for the CM ref processor. |
|
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|
1345 // That will be done at the start of the next marking cycle. |
|
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|
1346 assert(!ref_processor_cm()->discovery_enabled(), "Postcondition"); |
|
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|
1347 ref_processor_cm()->verify_no_references_recorded(); |
| 342 | 1348 |
| 1349 reset_gc_time_stamp(); | |
| 1350 // Since everything potentially moved, we will clear all remembered | |
|
626
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1351 // sets, and clear all cards. Later we will rebuild remebered |
|
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|
1352 // sets. We will also reset the GC time stamps of the regions. |
| 342 | 1353 PostMCRemSetClearClosure rs_clear(mr_bs()); |
| 1354 heap_region_iterate(&rs_clear); | |
| 1355 | |
| 1356 // Resize the heap if necessary. | |
|
1656
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|
1357 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
| 342 | 1358 |
|
3778
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|
1359 if (_hr_printer.is_active()) { |
|
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|
1360 // We should do this after we potentially resize the heap so |
|
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|
1361 // that all the COMMIT / UNCOMMIT events are generated before |
|
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|
1362 // the end GC event. |
|
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|
1363 |
|
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|
1364 PostCompactionPrinterClosure cl(hr_printer()); |
|
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|
1365 heap_region_iterate(&cl); |
|
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|
1366 |
|
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|
1367 _hr_printer.end_gc(true /* full */, (size_t) total_collections()); |
|
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|
1368 } |
|
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|
1369 |
| 342 | 1370 if (_cg1r->use_cache()) { |
| 1371 _cg1r->clear_and_record_card_counts(); | |
| 1372 _cg1r->clear_hot_cache(); | |
| 1373 } | |
| 1374 | |
|
626
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|
1375 // Rebuild remembered sets of all regions. |
|
1833
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|
1376 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4095
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|
1377 int n_workers = |
|
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|
1378 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
|
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|
1379 workers()->active_workers(), |
|
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|
1380 Threads::number_of_non_daemon_threads()); |
|
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|
1381 assert(UseDynamicNumberOfGCThreads || |
|
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|
1382 n_workers == workers()->total_workers(), |
|
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|
1383 "If not dynamic should be using all the workers"); |
|
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|
1384 workers()->set_active_workers(n_workers); |
|
bca17e38de00
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|
1385 // Set parallel threads in the heap (_n_par_threads) only |
|
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|
1386 // before a parallel phase and always reset it to 0 after |
|
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|
1387 // the phase so that the number of parallel threads does |
|
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|
1388 // no get carried forward to a serial phase where there |
|
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|
1389 // may be code that is "possibly_parallel". |
|
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|
1390 set_par_threads(n_workers); |
|
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|
1391 |
|
626
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|
1392 ParRebuildRSTask rebuild_rs_task(this); |
|
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|
1393 assert(check_heap_region_claim_values( |
|
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|
1394 HeapRegion::InitialClaimValue), "sanity check"); |
|
4095
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|
1395 assert(UseDynamicNumberOfGCThreads || |
|
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|
1396 workers()->active_workers() == workers()->total_workers(), |
|
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|
1397 "Unless dynamic should use total workers"); |
|
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|
1398 // Use the most recent number of active workers |
|
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|
1399 assert(workers()->active_workers() > 0, |
|
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|
1400 "Active workers not properly set"); |
|
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|
1401 set_par_threads(workers()->active_workers()); |
|
626
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|
1402 workers()->run_task(&rebuild_rs_task); |
|
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|
1403 set_par_threads(0); |
|
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|
1404 assert(check_heap_region_claim_values( |
|
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|
1405 HeapRegion::RebuildRSClaimValue), "sanity check"); |
|
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|
1406 reset_heap_region_claim_values(); |
|
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|
1407 } else { |
|
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|
1408 RebuildRSOutOfRegionClosure rebuild_rs(this); |
|
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|
1409 heap_region_iterate(&rebuild_rs); |
|
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|
1410 } |
|
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|
1411 |
| 342 | 1412 if (PrintGC) { |
| 1413 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
| 1414 } | |
| 1415 | |
| 1416 if (true) { // FIXME | |
| 1417 // Ask the permanent generation to adjust size for full collections | |
| 1418 perm()->compute_new_size(); | |
| 1419 } | |
| 1420 | |
|
1394
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|
1421 // Start a new incremental collection set for the next pause |
|
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|
1422 assert(g1_policy()->collection_set() == NULL, "must be"); |
|
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|
1423 g1_policy()->start_incremental_cset_building(); |
|
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|
1424 |
|
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|
1425 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
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|
1426 // regions to the incremental collection set for the next |
|
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|
1427 // evacuation pause. |
|
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|
1428 clear_cset_fast_test(); |
|
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|
1429 |
|
2433
abdfc822206f
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diff
changeset
|
1430 init_mutator_alloc_region(); |
|
abdfc822206f
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diff
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|
1431 |
| 342 | 1432 double end = os::elapsedTime(); |
| 1433 g1_policy()->record_full_collection_end(); | |
| 1434 | |
|
546
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6690928: Use spinning in combination with yields for workstealing termination.
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|
1435 #ifdef TRACESPINNING |
|
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6690928: Use spinning in combination with yields for workstealing termination.
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diff
changeset
|
1436 ParallelTaskTerminator::print_termination_counts(); |
|
05c6d52fa7a9
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diff
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|
1437 #endif |
|
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|
1438 |
| 342 | 1439 gc_epilogue(true); |
| 1440 | |
| 794 | 1441 // Discard all rset updates |
| 1442 JavaThread::dirty_card_queue_set().abandon_logs(); | |
|
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
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changeset
|
1443 assert(!G1DeferredRSUpdate |
|
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|
1444 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
| 342 | 1445 } |
| 1446 | |
|
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1447 _young_list->reset_sampled_info(); |
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1448 // At this point there should be no regions in the |
|
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1449 // entire heap tagged as young. |
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1450 assert( check_young_list_empty(true /* check_heap */), |
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1451 "young list should be empty at this point"); |
|
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1452 |
|
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1453 // Update the number of full collections that have been completed. |
|
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1454 increment_full_collections_completed(false /* concurrent */); |
|
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1455 |
| 3766 | 1456 _hrs.verify_optional(); |
| 2152 | 1457 verify_region_sets_optional(); |
| 1458 | |
|
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1459 if (PrintHeapAtGC) { |
|
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1460 Universe::print_heap_after_gc(); |
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1461 } |
|
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1462 g1mm()->update_sizes(); |
|
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1463 post_full_gc_dump(); |
| 1973 | 1464 |
| 1465 return true; | |
| 342 | 1466 } |
| 1467 | |
| 1468 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
| 1973 | 1469 // do_collection() will return whether it succeeded in performing |
| 1470 // the GC. Currently, there is no facility on the | |
| 1471 // do_full_collection() API to notify the caller than the collection | |
| 1472 // did not succeed (e.g., because it was locked out by the GC | |
| 1473 // locker). So, right now, we'll ignore the return value. | |
| 1474 bool dummy = do_collection(true, /* explicit_gc */ | |
| 1475 clear_all_soft_refs, | |
| 1476 0 /* word_size */); | |
| 342 | 1477 } |
| 1478 | |
| 1479 // This code is mostly copied from TenuredGeneration. | |
| 1480 void | |
| 1481 G1CollectedHeap:: | |
| 1482 resize_if_necessary_after_full_collection(size_t word_size) { | |
| 1483 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
| 1484 | |
| 1485 // Include the current allocation, if any, and bytes that will be | |
| 1486 // pre-allocated to support collections, as "used". | |
| 1487 const size_t used_after_gc = used(); | |
| 1488 const size_t capacity_after_gc = capacity(); | |
| 1489 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
| 1490 | |
|
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1491 // This is enforced in arguments.cpp. |
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1492 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
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1493 "otherwise the code below doesn't make sense"); |
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1494 |
| 342 | 1495 // We don't have floating point command-line arguments |
|
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1496 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
| 342 | 1497 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
|
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1498 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
| 342 | 1499 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
| 1500 | |
|
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1501 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
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1502 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
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1503 |
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1504 // We have to be careful here as these two calculations can overflow |
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1505 // 32-bit size_t's. |
|
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1506 double used_after_gc_d = (double) used_after_gc; |
|
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1507 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
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1508 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
|
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1509 |
|
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1510 // Let's make sure that they are both under the max heap size, which |
|
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1511 // by default will make them fit into a size_t. |
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1512 double desired_capacity_upper_bound = (double) max_heap_size; |
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1513 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
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1514 desired_capacity_upper_bound); |
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1515 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
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1516 desired_capacity_upper_bound); |
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1517 |
|
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1518 // We can now safely turn them into size_t's. |
|
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1519 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
|
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1520 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
|
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1521 |
|
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1522 // This assert only makes sense here, before we adjust them |
|
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1523 // with respect to the min and max heap size. |
|
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1524 assert(minimum_desired_capacity <= maximum_desired_capacity, |
|
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1525 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
|
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1526 "maximum_desired_capacity = "SIZE_FORMAT, |
|
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1527 minimum_desired_capacity, maximum_desired_capacity)); |
|
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|
1528 |
|
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1529 // Should not be greater than the heap max size. No need to adjust |
|
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1530 // it with respect to the heap min size as it's a lower bound (i.e., |
|
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1531 // we'll try to make the capacity larger than it, not smaller). |
|
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|
1532 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
|
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|
1533 // Should not be less than the heap min size. No need to adjust it |
|
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1534 // with respect to the heap max size as it's an upper bound (i.e., |
|
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|
1535 // we'll try to make the capacity smaller than it, not greater). |
|
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|
1536 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
| 342 | 1537 |
|
1717
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|
1538 if (capacity_after_gc < minimum_desired_capacity) { |
| 342 | 1539 // Don't expand unless it's significant |
| 1540 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
|
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|
1541 ergo_verbose4(ErgoHeapSizing, |
|
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1542 "attempt heap expansion", |
|
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|
1543 ergo_format_reason("capacity lower than " |
|
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1544 "min desired capacity after Full GC") |
|
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|
1545 ergo_format_byte("capacity") |
|
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|
1546 ergo_format_byte("occupancy") |
|
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|
1547 ergo_format_byte_perc("min desired capacity"), |
|
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|
1548 capacity_after_gc, used_after_gc, |
|
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|
1549 minimum_desired_capacity, (double) MinHeapFreeRatio); |
|
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|
1550 expand(expand_bytes); |
| 342 | 1551 |
| 1552 // No expansion, now see if we want to shrink | |
|
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|
1553 } else if (capacity_after_gc > maximum_desired_capacity) { |
| 342 | 1554 // Capacity too large, compute shrinking size |
| 1555 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
|
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|
1556 ergo_verbose4(ErgoHeapSizing, |
|
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1557 "attempt heap shrinking", |
|
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|
1558 ergo_format_reason("capacity higher than " |
|
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|
1559 "max desired capacity after Full GC") |
|
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|
1560 ergo_format_byte("capacity") |
|
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|
1561 ergo_format_byte("occupancy") |
|
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|
1562 ergo_format_byte_perc("max desired capacity"), |
|
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|
1563 capacity_after_gc, used_after_gc, |
|
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|
1564 maximum_desired_capacity, (double) MaxHeapFreeRatio); |
| 342 | 1565 shrink(shrink_bytes); |
| 1566 } | |
| 1567 } | |
| 1568 | |
| 1569 | |
| 1570 HeapWord* | |
| 1973 | 1571 G1CollectedHeap::satisfy_failed_allocation(size_t word_size, |
| 1572 bool* succeeded) { | |
| 2152 | 1573 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1973 | 1574 |
| 1575 *succeeded = true; | |
| 1576 // Let's attempt the allocation first. | |
|
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|
1577 HeapWord* result = |
|
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|
1578 attempt_allocation_at_safepoint(word_size, |
|
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|
1579 false /* expect_null_mutator_alloc_region */); |
| 1973 | 1580 if (result != NULL) { |
| 1581 assert(*succeeded, "sanity"); | |
| 1582 return result; | |
| 1583 } | |
| 342 | 1584 |
| 1585 // In a G1 heap, we're supposed to keep allocation from failing by | |
| 1586 // incremental pauses. Therefore, at least for now, we'll favor | |
| 1587 // expansion over collection. (This might change in the future if we can | |
| 1588 // do something smarter than full collection to satisfy a failed alloc.) | |
| 1589 result = expand_and_allocate(word_size); | |
| 1590 if (result != NULL) { | |
| 1973 | 1591 assert(*succeeded, "sanity"); |
| 342 | 1592 return result; |
| 1593 } | |
| 1594 | |
| 1973 | 1595 // Expansion didn't work, we'll try to do a Full GC. |
| 1596 bool gc_succeeded = do_collection(false, /* explicit_gc */ | |
| 1597 false, /* clear_all_soft_refs */ | |
| 1598 word_size); | |
| 1599 if (!gc_succeeded) { | |
| 1600 *succeeded = false; | |
| 1601 return NULL; | |
| 1602 } | |
| 1603 | |
| 1604 // Retry the allocation | |
| 1605 result = attempt_allocation_at_safepoint(word_size, | |
|
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|
1606 true /* expect_null_mutator_alloc_region */); |
| 342 | 1607 if (result != NULL) { |
| 1973 | 1608 assert(*succeeded, "sanity"); |
| 342 | 1609 return result; |
| 1610 } | |
| 1611 | |
| 1973 | 1612 // Then, try a Full GC that will collect all soft references. |
| 1613 gc_succeeded = do_collection(false, /* explicit_gc */ | |
| 1614 true, /* clear_all_soft_refs */ | |
| 1615 word_size); | |
| 1616 if (!gc_succeeded) { | |
| 1617 *succeeded = false; | |
| 1618 return NULL; | |
| 1619 } | |
| 1620 | |
| 1621 // Retry the allocation once more | |
| 1622 result = attempt_allocation_at_safepoint(word_size, | |
|
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|
1623 true /* expect_null_mutator_alloc_region */); |
| 342 | 1624 if (result != NULL) { |
| 1973 | 1625 assert(*succeeded, "sanity"); |
| 342 | 1626 return result; |
| 1627 } | |
| 1628 | |
|
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|
1629 assert(!collector_policy()->should_clear_all_soft_refs(), |
| 1973 | 1630 "Flag should have been handled and cleared prior to this point"); |
|
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|
1631 |
| 342 | 1632 // What else? We might try synchronous finalization later. If the total |
| 1633 // space available is large enough for the allocation, then a more | |
| 1634 // complete compaction phase than we've tried so far might be | |
| 1635 // appropriate. | |
| 1973 | 1636 assert(*succeeded, "sanity"); |
| 342 | 1637 return NULL; |
| 1638 } | |
| 1639 | |
| 1640 // Attempting to expand the heap sufficiently | |
| 1641 // to support an allocation of the given "word_size". If | |
| 1642 // successful, perform the allocation and return the address of the | |
| 1643 // allocated block, or else "NULL". | |
| 1644 | |
| 1645 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
| 2152 | 1646 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1647 | |
| 1648 verify_region_sets_optional(); | |
| 1973 | 1649 |
|
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1650 size_t expand_bytes = MAX2(word_size * HeapWordSize, MinHeapDeltaBytes); |
|
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1651 ergo_verbose1(ErgoHeapSizing, |
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1652 "attempt heap expansion", |
|
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1653 ergo_format_reason("allocation request failed") |
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1654 ergo_format_byte("allocation request"), |
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1655 word_size * HeapWordSize); |
|
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1656 if (expand(expand_bytes)) { |
| 3766 | 1657 _hrs.verify_optional(); |
|
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1658 verify_region_sets_optional(); |
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1659 return attempt_allocation_at_safepoint(word_size, |
|
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1660 false /* expect_null_mutator_alloc_region */); |
|
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1661 } |
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1662 return NULL; |
| 342 | 1663 } |
| 1664 | |
| 3766 | 1665 void G1CollectedHeap::update_committed_space(HeapWord* old_end, |
| 1666 HeapWord* new_end) { | |
| 1667 assert(old_end != new_end, "don't call this otherwise"); | |
| 1668 assert((HeapWord*) _g1_storage.high() == new_end, "invariant"); | |
| 1669 | |
| 1670 // Update the committed mem region. | |
| 1671 _g1_committed.set_end(new_end); | |
| 1672 // Tell the card table about the update. | |
| 1673 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
| 1674 // Tell the BOT about the update. | |
| 1675 _bot_shared->resize(_g1_committed.word_size()); | |
| 1676 } | |
| 1677 | |
|
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1678 bool G1CollectedHeap::expand(size_t expand_bytes) { |
| 342 | 1679 size_t old_mem_size = _g1_storage.committed_size(); |
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1680 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
| 342 | 1681 aligned_expand_bytes = align_size_up(aligned_expand_bytes, |
| 1682 HeapRegion::GrainBytes); | |
|
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1683 ergo_verbose2(ErgoHeapSizing, |
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1684 "expand the heap", |
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1685 ergo_format_byte("requested expansion amount") |
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1686 ergo_format_byte("attempted expansion amount"), |
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1687 expand_bytes, aligned_expand_bytes); |
|
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1688 |
| 3766 | 1689 // First commit the memory. |
| 1690 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
|
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1691 bool successful = _g1_storage.expand_by(aligned_expand_bytes); |
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1692 if (successful) { |
| 3766 | 1693 // Then propagate this update to the necessary data structures. |
| 1694 HeapWord* new_end = (HeapWord*) _g1_storage.high(); | |
| 1695 update_committed_space(old_end, new_end); | |
| 1696 | |
| 1697 FreeRegionList expansion_list("Local Expansion List"); | |
| 1698 MemRegion mr = _hrs.expand_by(old_end, new_end, &expansion_list); | |
| 1699 assert(mr.start() == old_end, "post-condition"); | |
| 1700 // mr might be a smaller region than what was requested if | |
| 1701 // expand_by() was unable to allocate the HeapRegion instances | |
| 1702 assert(mr.end() <= new_end, "post-condition"); | |
| 1703 | |
| 1704 size_t actual_expand_bytes = mr.byte_size(); | |
| 1705 assert(actual_expand_bytes <= aligned_expand_bytes, "post-condition"); | |
| 1706 assert(actual_expand_bytes == expansion_list.total_capacity_bytes(), | |
| 1707 "post-condition"); | |
| 1708 if (actual_expand_bytes < aligned_expand_bytes) { | |
| 1709 // We could not expand _hrs to the desired size. In this case we | |
| 1710 // need to shrink the committed space accordingly. | |
| 1711 assert(mr.end() < new_end, "invariant"); | |
| 1712 | |
| 1713 size_t diff_bytes = aligned_expand_bytes - actual_expand_bytes; | |
| 1714 // First uncommit the memory. | |
| 1715 _g1_storage.shrink_by(diff_bytes); | |
| 1716 // Then propagate this update to the necessary data structures. | |
| 1717 update_committed_space(new_end, mr.end()); | |
|
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1718 } |
| 3766 | 1719 _free_list.add_as_tail(&expansion_list); |
|
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1720 |
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1721 if (_hr_printer.is_active()) { |
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1722 HeapWord* curr = mr.start(); |
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1723 while (curr < mr.end()) { |
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1724 HeapWord* curr_end = curr + HeapRegion::GrainWords; |
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1725 _hr_printer.commit(curr, curr_end); |
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1726 curr = curr_end; |
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1727 } |
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1728 assert(curr == mr.end(), "post-condition"); |
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1729 } |
|
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1730 g1_policy()->record_new_heap_size(n_regions()); |
|
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1731 } else { |
|
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1732 ergo_verbose0(ErgoHeapSizing, |
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1733 "did not expand the heap", |
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1734 ergo_format_reason("heap expansion operation failed")); |
|
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1735 // The expansion of the virtual storage space was unsuccessful. |
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1736 // Let's see if it was because we ran out of swap. |
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1737 if (G1ExitOnExpansionFailure && |
|
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1738 _g1_storage.uncommitted_size() >= aligned_expand_bytes) { |
|
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1739 // We had head room... |
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1740 vm_exit_out_of_memory(aligned_expand_bytes, "G1 heap expansion"); |
| 342 | 1741 } |
| 1742 } | |
|
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1743 return successful; |
| 342 | 1744 } |
| 1745 | |
| 3766 | 1746 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) { |
| 342 | 1747 size_t old_mem_size = _g1_storage.committed_size(); |
| 1748 size_t aligned_shrink_bytes = | |
| 1749 ReservedSpace::page_align_size_down(shrink_bytes); | |
| 1750 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
| 1751 HeapRegion::GrainBytes); | |
| 1752 size_t num_regions_deleted = 0; | |
| 3766 | 1753 MemRegion mr = _hrs.shrink_by(aligned_shrink_bytes, &num_regions_deleted); |
| 1754 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
| 1755 assert(mr.end() == old_end, "post-condition"); | |
|
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1756 |
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1757 ergo_verbose3(ErgoHeapSizing, |
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1758 "shrink the heap", |
|
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1759 ergo_format_byte("requested shrinking amount") |
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1760 ergo_format_byte("aligned shrinking amount") |
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1761 ergo_format_byte("attempted shrinking amount"), |
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1762 shrink_bytes, aligned_shrink_bytes, mr.byte_size()); |
| 3766 | 1763 if (mr.byte_size() > 0) { |
|
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1764 if (_hr_printer.is_active()) { |
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1765 HeapWord* curr = mr.end(); |
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1766 while (curr > mr.start()) { |
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1767 HeapWord* curr_end = curr; |
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1768 curr -= HeapRegion::GrainWords; |
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1769 _hr_printer.uncommit(curr, curr_end); |
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1770 } |
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1771 assert(curr == mr.start(), "post-condition"); |
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1772 } |
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1773 |
| 342 | 1774 _g1_storage.shrink_by(mr.byte_size()); |
| 3766 | 1775 HeapWord* new_end = (HeapWord*) _g1_storage.high(); |
| 1776 assert(mr.start() == new_end, "post-condition"); | |
| 1777 | |
| 1778 _expansion_regions += num_regions_deleted; | |
| 1779 update_committed_space(old_end, new_end); | |
| 1780 HeapRegionRemSet::shrink_heap(n_regions()); | |
|
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1781 g1_policy()->record_new_heap_size(n_regions()); |
|
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1782 } else { |
|
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1783 ergo_verbose0(ErgoHeapSizing, |
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1784 "did not shrink the heap", |
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1785 ergo_format_reason("heap shrinking operation failed")); |
| 342 | 1786 } |
| 1787 } | |
| 1788 | |
| 1789 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
| 2152 | 1790 verify_region_sets_optional(); |
| 1791 | |
|
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1792 // We should only reach here at the end of a Full GC which means we |
|
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1793 // should not not be holding to any GC alloc regions. The method |
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1794 // below will make sure of that and do any remaining clean up. |
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1795 abandon_gc_alloc_regions(); |
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1796 |
| 2152 | 1797 // Instead of tearing down / rebuilding the free lists here, we |
| 1798 // could instead use the remove_all_pending() method on free_list to | |
| 1799 // remove only the ones that we need to remove. | |
| 4072 | 1800 tear_down_region_sets(true /* free_list_only */); |
| 342 | 1801 shrink_helper(shrink_bytes); |
| 4072 | 1802 rebuild_region_sets(true /* free_list_only */); |
| 2152 | 1803 |
| 3766 | 1804 _hrs.verify_optional(); |
| 2152 | 1805 verify_region_sets_optional(); |
| 342 | 1806 } |
| 1807 | |
| 1808 // Public methods. | |
| 1809 | |
| 1810 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 1811 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 1812 #endif // _MSC_VER | |
| 1813 | |
| 1814 | |
| 1815 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
| 1816 SharedHeap(policy_), | |
| 1817 _g1_policy(policy_), | |
| 1111 | 1818 _dirty_card_queue_set(false), |
| 1705 | 1819 _into_cset_dirty_card_queue_set(false), |
|
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1820 _is_alive_closure_cm(this), |
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1821 _is_alive_closure_stw(this), |
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1822 _ref_processor_cm(NULL), |
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1823 _ref_processor_stw(NULL), |
| 342 | 1824 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), |
| 1825 _bot_shared(NULL), | |
| 1826 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
| 1827 _evac_failure_scan_stack(NULL) , | |
| 1828 _mark_in_progress(false), | |
| 2152 | 1829 _cg1r(NULL), _summary_bytes_used(0), |
|
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1830 _g1mm(NULL), |
| 342 | 1831 _refine_cte_cl(NULL), |
| 1832 _full_collection(false), | |
| 2152 | 1833 _free_list("Master Free List"), |
| 1834 _secondary_free_list("Secondary Free List"), | |
| 4072 | 1835 _old_set("Old Set"), |
| 2152 | 1836 _humongous_set("Master Humongous Set"), |
| 1837 _free_regions_coming(false), | |
| 342 | 1838 _young_list(new YoungList(this)), |
| 1839 _gc_time_stamp(0), | |
|
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1840 _retained_old_gc_alloc_region(NULL), |
| 526 | 1841 _surviving_young_words(NULL), |
|
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1842 _full_collections_completed(0), |
| 526 | 1843 _in_cset_fast_test(NULL), |
|
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1844 _in_cset_fast_test_base(NULL), |
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1845 _dirty_cards_region_list(NULL) { |
| 342 | 1846 _g1h = this; // To catch bugs. |
| 1847 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
| 1848 vm_exit_during_initialization("Failed necessary allocation."); | |
| 1849 } | |
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1850 |
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1851 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1852 |
| 342 | 1853 int n_queues = MAX2((int)ParallelGCThreads, 1); |
| 1854 _task_queues = new RefToScanQueueSet(n_queues); | |
| 1855 | |
| 1856 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
| 1857 assert(n_rem_sets > 0, "Invariant."); | |
| 1858 | |
| 1859 HeapRegionRemSetIterator** iter_arr = | |
| 1860 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
| 1861 for (int i = 0; i < n_queues; i++) { | |
| 1862 iter_arr[i] = new HeapRegionRemSetIterator(); | |
| 1863 } | |
| 1864 _rem_set_iterator = iter_arr; | |
| 1865 | |
| 1866 for (int i = 0; i < n_queues; i++) { | |
| 1867 RefToScanQueue* q = new RefToScanQueue(); | |
| 1868 q->initialize(); | |
| 1869 _task_queues->register_queue(i, q); | |
| 1870 } | |
| 1871 | |
| 1872 guarantee(_task_queues != NULL, "task_queues allocation failure."); | |
| 1873 } | |
| 1874 | |
| 1875 jint G1CollectedHeap::initialize() { | |
| 1166 | 1876 CollectedHeap::pre_initialize(); |
| 342 | 1877 os::enable_vtime(); |
| 1878 | |
| 1879 // Necessary to satisfy locking discipline assertions. | |
| 1880 | |
| 1881 MutexLocker x(Heap_lock); | |
| 1882 | |
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1883 // We have to initialize the printer before committing the heap, as |
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1884 // it will be used then. |
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1885 _hr_printer.set_active(G1PrintHeapRegions); |
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1886 |
| 342 | 1887 // While there are no constraints in the GC code that HeapWordSize |
| 1888 // be any particular value, there are multiple other areas in the | |
| 1889 // system which believe this to be true (e.g. oop->object_size in some | |
| 1890 // cases incorrectly returns the size in wordSize units rather than | |
| 1891 // HeapWordSize). | |
| 1892 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
| 1893 | |
| 1894 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
| 1895 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
| 1896 | |
| 1897 // Ensure that the sizes are properly aligned. | |
| 1898 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1899 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1900 | |
| 1901 _cg1r = new ConcurrentG1Refine(); | |
| 1902 | |
| 1903 // Reserve the maximum. | |
| 1904 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
| 1905 // Includes the perm-gen. | |
|
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1906 |
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1907 // When compressed oops are enabled, the preferred heap base |
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1908 // is calculated by subtracting the requested size from the |
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1909 // 32Gb boundary and using the result as the base address for |
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1910 // heap reservation. If the requested size is not aligned to |
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1911 // HeapRegion::GrainBytes (i.e. the alignment that is passed |
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1912 // into the ReservedHeapSpace constructor) then the actual |
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1913 // base of the reserved heap may end up differing from the |
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1914 // address that was requested (i.e. the preferred heap base). |
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1915 // If this happens then we could end up using a non-optimal |
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1916 // compressed oops mode. |
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1917 |
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1918 // Since max_byte_size is aligned to the size of a heap region (checked |
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1919 // above), we also need to align the perm gen size as it might not be. |
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1920 const size_t total_reserved = max_byte_size + |
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1921 align_size_up(pgs->max_size(), HeapRegion::GrainBytes); |
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1922 Universe::check_alignment(total_reserved, HeapRegion::GrainBytes, "g1 heap and perm"); |
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1923 |
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1924 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1925 |
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1926 ReservedHeapSpace heap_rs(total_reserved, HeapRegion::GrainBytes, |
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1927 UseLargePages, addr); |
|
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1928 |
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1929 if (UseCompressedOops) { |
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1930 if (addr != NULL && !heap_rs.is_reserved()) { |
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1931 // Failed to reserve at specified address - the requested memory |
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1932 // region is taken already, for example, by 'java' launcher. |
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1933 // Try again to reserver heap higher. |
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1934 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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1935 |
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1936 ReservedHeapSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1937 UseLargePages, addr); |
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1938 |
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1939 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1940 // Failed to reserve at specified address again - give up. |
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1941 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1942 assert(addr == NULL, ""); |
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1943 |
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1944 ReservedHeapSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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1945 UseLargePages, addr); |
|
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1946 heap_rs = heap_rs1; |
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1947 } else { |
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1948 heap_rs = heap_rs0; |
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1949 } |
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1950 } |
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1951 } |
| 342 | 1952 |
| 1953 if (!heap_rs.is_reserved()) { | |
| 1954 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
| 1955 return JNI_ENOMEM; | |
| 1956 } | |
| 1957 | |
| 1958 // It is important to do this in a way such that concurrent readers can't | |
| 1959 // temporarily think somethings in the heap. (I've actually seen this | |
| 1960 // happen in asserts: DLD.) | |
| 1961 _reserved.set_word_size(0); | |
| 1962 _reserved.set_start((HeapWord*)heap_rs.base()); | |
| 1963 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 1964 | |
| 1965 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
| 1966 | |
| 1967 // Create the gen rem set (and barrier set) for the entire reserved region. | |
| 1968 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
| 1969 set_barrier_set(rem_set()->bs()); | |
| 1970 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
| 1971 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
| 1972 } else { | |
| 1973 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
| 1974 return JNI_ENOMEM; | |
| 1975 } | |
| 1976 | |
| 1977 // Also create a G1 rem set. | |
| 1861 | 1978 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { |
| 1979 _g1_rem_set = new G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
| 342 | 1980 } else { |
| 1861 | 1981 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); |
| 1982 return JNI_ENOMEM; | |
| 342 | 1983 } |
| 1984 | |
| 1985 // Carve out the G1 part of the heap. | |
| 1986 | |
| 1987 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
| 1988 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
| 1989 g1_rs.size()/HeapWordSize); | |
| 1990 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
| 1991 | |
| 1992 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
| 1993 | |
| 1994 _g1_storage.initialize(g1_rs, 0); | |
| 1995 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
| 3766 | 1996 _hrs.initialize((HeapWord*) _g1_reserved.start(), |
| 1997 (HeapWord*) _g1_reserved.end(), | |
| 1998 _expansion_regions); | |
| 342 | 1999 |
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2000 // 6843694 - ensure that the maximum region index can fit |
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2001 // in the remembered set structures. |
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2002 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
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2003 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
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2004 |
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2005 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
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2006 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
|
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2007 guarantee(HeapRegion::CardsPerRegion < max_cards_per_region, |
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2008 "too many cards per region"); |
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2009 |
| 2152 | 2010 HeapRegionSet::set_unrealistically_long_length(max_regions() + 1); |
| 2011 | |
| 342 | 2012 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
| 2013 heap_word_size(init_byte_size)); | |
| 2014 | |
| 2015 _g1h = this; | |
| 2016 | |
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2017 _in_cset_fast_test_length = max_regions(); |
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2018 _in_cset_fast_test_base = NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); |
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2019 |
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2020 // We're biasing _in_cset_fast_test to avoid subtracting the |
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2021 // beginning of the heap every time we want to index; basically |
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2022 // it's the same with what we do with the card table. |
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2023 _in_cset_fast_test = _in_cset_fast_test_base - |
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2024 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
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2025 |
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2026 // Clear the _cset_fast_test bitmap in anticipation of adding |
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2027 // regions to the incremental collection set for the first |
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2028 // evacuation pause. |
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2029 clear_cset_fast_test(); |
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2030 |
| 342 | 2031 // Create the ConcurrentMark data structure and thread. |
| 2032 // (Must do this late, so that "max_regions" is defined.) | |
| 2033 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
| 2034 _cmThread = _cm->cmThread(); | |
| 2035 | |
| 2036 // Initialize the from_card cache structure of HeapRegionRemSet. | |
| 2037 HeapRegionRemSet::init_heap(max_regions()); | |
| 2038 | |
| 677 | 2039 // Now expand into the initial heap size. |
|
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2040 if (!expand(init_byte_size)) { |
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2041 vm_exit_during_initialization("Failed to allocate initial heap."); |
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2042 return JNI_ENOMEM; |
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2043 } |
| 342 | 2044 |
| 2045 // Perform any initialization actions delegated to the policy. | |
| 2046 g1_policy()->init(); | |
| 2047 | |
| 2048 _refine_cte_cl = | |
| 2049 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
| 2050 g1_rem_set(), | |
| 2051 concurrent_g1_refine()); | |
| 2052 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 2053 | |
| 2054 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
| 2055 SATB_Q_FL_lock, | |
| 1111 | 2056 G1SATBProcessCompletedThreshold, |
| 342 | 2057 Shared_SATB_Q_lock); |
| 794 | 2058 |
| 2059 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
| 2060 DirtyCardQ_FL_lock, | |
| 1111 | 2061 concurrent_g1_refine()->yellow_zone(), |
| 2062 concurrent_g1_refine()->red_zone(), | |
| 794 | 2063 Shared_DirtyCardQ_lock); |
| 2064 | |
|
616
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2065 if (G1DeferredRSUpdate) { |
|
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|
2066 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
|
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|
2067 DirtyCardQ_FL_lock, |
| 1111 | 2068 -1, // never trigger processing |
| 2069 -1, // no limit on length | |
|
616
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|
2070 Shared_DirtyCardQ_lock, |
|
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|
2071 &JavaThread::dirty_card_queue_set()); |
|
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|
2072 } |
| 1705 | 2073 |
| 2074 // Initialize the card queue set used to hold cards containing | |
| 2075 // references into the collection set. | |
| 2076 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
| 2077 DirtyCardQ_FL_lock, | |
| 2078 -1, // never trigger processing | |
| 2079 -1, // no limit on length | |
| 2080 Shared_DirtyCardQ_lock, | |
| 2081 &JavaThread::dirty_card_queue_set()); | |
| 2082 | |
| 342 | 2083 // In case we're keeping closure specialization stats, initialize those |
| 2084 // counts and that mechanism. | |
| 2085 SpecializationStats::clear(); | |
| 2086 | |
| 2087 // Do later initialization work for concurrent refinement. | |
| 2088 _cg1r->init(); | |
| 2089 | |
|
2433
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|
2090 // Here we allocate the dummy full region that is required by the |
|
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2091 // G1AllocRegion class. If we don't pass an address in the reserved |
|
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|
2092 // space here, lots of asserts fire. |
| 3766 | 2093 |
| 2094 HeapRegion* dummy_region = new_heap_region(0 /* index of bottom region */, | |
| 2095 _g1_reserved.start()); | |
|
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2096 // We'll re-use the same region whether the alloc region will |
|
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2097 // require BOT updates or not and, if it doesn't, then a non-young |
|
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2098 // region will complain that it cannot support allocations without |
|
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2099 // BOT updates. So we'll tag the dummy region as young to avoid that. |
|
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|
2100 dummy_region->set_young(); |
|
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|
2101 // Make sure it's full. |
|
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|
2102 dummy_region->set_top(dummy_region->end()); |
|
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2103 G1AllocRegion::setup(this, dummy_region); |
|
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2104 |
|
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|
2105 init_mutator_alloc_region(); |
|
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|
2106 |
|
3289
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|
2107 // Do create of the monitoring and management support so that |
|
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|
2108 // values in the heap have been properly initialized. |
|
3980
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|
2109 _g1mm = new G1MonitoringSupport(this); |
|
3289
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|
2110 |
| 342 | 2111 return JNI_OK; |
| 2112 } | |
| 2113 | |
| 2114 void G1CollectedHeap::ref_processing_init() { | |
|
1974
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|
2115 // Reference processing in G1 currently works as follows: |
|
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2116 // |
|
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2117 // * There are two reference processor instances. One is |
|
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|
2118 // used to record and process discovered references |
|
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|
2119 // during concurrent marking; the other is used to |
|
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|
2120 // record and process references during STW pauses |
|
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|
2121 // (both full and incremental). |
|
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|
2122 // * Both ref processors need to 'span' the entire heap as |
|
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|
2123 // the regions in the collection set may be dotted around. |
|
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|
2124 // |
|
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|
2125 // * For the concurrent marking ref processor: |
|
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|
2126 // * Reference discovery is enabled at initial marking. |
|
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|
2127 // * Reference discovery is disabled and the discovered |
|
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|
2128 // references processed etc during remarking. |
|
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|
2129 // * Reference discovery is MT (see below). |
|
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|
2130 // * Reference discovery requires a barrier (see below). |
|
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|
2131 // * Reference processing may or may not be MT |
|
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|
2132 // (depending on the value of ParallelRefProcEnabled |
|
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|
2133 // and ParallelGCThreads). |
|
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|
2134 // * A full GC disables reference discovery by the CM |
|
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|
2135 // ref processor and abandons any entries on it's |
|
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|
2136 // discovered lists. |
|
4dfb2df418f2
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|
2137 // |
|
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|
2138 // * For the STW processor: |
|
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|
2139 // * Non MT discovery is enabled at the start of a full GC. |
|
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|
2140 // * Processing and enqueueing during a full GC is non-MT. |
|
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|
2141 // * During a full GC, references are processed after marking. |
|
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|
2142 // |
|
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changeset
|
2143 // * Discovery (may or may not be MT) is enabled at the start |
|
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|
2144 // of an incremental evacuation pause. |
|
4dfb2df418f2
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changeset
|
2145 // * References are processed near the end of a STW evacuation pause. |
|
4dfb2df418f2
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3973
diff
changeset
|
2146 // * For both types of GC: |
|
4dfb2df418f2
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changeset
|
2147 // * Discovery is atomic - i.e. not concurrent. |
|
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parents:
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changeset
|
2148 // * Reference discovery will not need a barrier. |
|
1974
fd1d227ef1b9
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diff
changeset
|
2149 |
| 342 | 2150 SharedHeap::ref_processing_init(); |
| 2151 MemRegion mr = reserved_region(); | |
|
3979
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|
2152 |
|
4dfb2df418f2
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changeset
|
2153 // Concurrent Mark ref processor |
|
4dfb2df418f2
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diff
changeset
|
2154 _ref_processor_cm = |
|
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
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2361
diff
changeset
|
2155 new ReferenceProcessor(mr, // span |
|
3979
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diff
changeset
|
2156 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
|
4dfb2df418f2
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parents:
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diff
changeset
|
2157 // mt processing |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
2158 (int) ParallelGCThreads, |
|
4dfb2df418f2
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johnc
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3973
diff
changeset
|
2159 // degree of mt processing |
|
4dfb2df418f2
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diff
changeset
|
2160 (ParallelGCThreads > 1) || (ConcGCThreads > 1), |
|
4dfb2df418f2
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diff
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|
2161 // mt discovery |
|
4dfb2df418f2
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diff
changeset
|
2162 (int) MAX2(ParallelGCThreads, ConcGCThreads), |
|
4dfb2df418f2
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johnc
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3973
diff
changeset
|
2163 // degree of mt discovery |
|
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2164 false, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2165 // Reference discovery is not atomic |
|
4dfb2df418f2
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johnc
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diff
changeset
|
2166 &_is_alive_closure_cm, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
2167 // is alive closure |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
2168 // (for efficiency/performance) |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
2169 true); |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
2170 // Setting next fields of discovered |
|
4dfb2df418f2
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johnc
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3973
diff
changeset
|
2171 // lists requires a barrier. |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
2172 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
2173 // STW ref processor |
|
4dfb2df418f2
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johnc
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3973
diff
changeset
|
2174 _ref_processor_stw = |
|
4dfb2df418f2
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johnc
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3973
diff
changeset
|
2175 new ReferenceProcessor(mr, // span |
|
4dfb2df418f2
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3973
diff
changeset
|
2176 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
|
4dfb2df418f2
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diff
changeset
|
2177 // mt processing |
|
4dfb2df418f2
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parents:
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diff
changeset
|
2178 MAX2((int)ParallelGCThreads, 1), |
|
4dfb2df418f2
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diff
changeset
|
2179 // degree of mt processing |
|
4dfb2df418f2
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3973
diff
changeset
|
2180 (ParallelGCThreads > 1), |
|
4dfb2df418f2
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diff
changeset
|
2181 // mt discovery |
|
4dfb2df418f2
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diff
changeset
|
2182 MAX2((int)ParallelGCThreads, 1), |
|
4dfb2df418f2
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3973
diff
changeset
|
2183 // degree of mt discovery |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2184 true, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
2185 // Reference discovery is atomic |
|
4dfb2df418f2
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3973
diff
changeset
|
2186 &_is_alive_closure_stw, |
|
4dfb2df418f2
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diff
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|
2187 // is alive closure |
|
4dfb2df418f2
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3973
diff
changeset
|
2188 // (for efficiency/performance) |
|
4dfb2df418f2
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diff
changeset
|
2189 false); |
|
4dfb2df418f2
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diff
changeset
|
2190 // Setting next fields of discovered |
|
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|
2191 // lists requires a barrier. |
| 342 | 2192 } |
| 2193 | |
| 2194 size_t G1CollectedHeap::capacity() const { | |
| 2195 return _g1_committed.byte_size(); | |
| 2196 } | |
| 2197 | |
| 1705 | 2198 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
| 2199 DirtyCardQueue* into_cset_dcq, | |
| 2200 bool concurrent, | |
| 342 | 2201 int worker_i) { |
| 889 | 2202 // Clean cards in the hot card cache |
| 1705 | 2203 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set(), into_cset_dcq); |
| 889 | 2204 |
| 342 | 2205 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
| 2206 int n_completed_buffers = 0; | |
| 1705 | 2207 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
| 342 | 2208 n_completed_buffers++; |
| 2209 } | |
| 2210 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
| 2211 (double) n_completed_buffers); | |
| 2212 dcqs.clear_n_completed_buffers(); | |
| 2213 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
| 2214 } | |
| 2215 | |
| 2216 | |
| 2217 // Computes the sum of the storage used by the various regions. | |
| 2218 | |
| 2219 size_t G1CollectedHeap::used() const { | |
|
862
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861
diff
changeset
|
2220 assert(Heap_lock->owner() != NULL, |
|
36b5611220a7
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861
diff
changeset
|
2221 "Should be owned on this thread's behalf."); |
| 342 | 2222 size_t result = _summary_bytes_used; |
|
845
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838
diff
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|
2223 // Read only once in case it is set to NULL concurrently |
|
2433
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|
2224 HeapRegion* hr = _mutator_alloc_region.get(); |
|
845
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|
2225 if (hr != NULL) |
|
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|
2226 result += hr->used(); |
| 342 | 2227 return result; |
| 2228 } | |
| 2229 | |
|
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
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845
diff
changeset
|
2230 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
|
2231 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
|
2232 return result; |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
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845
diff
changeset
|
2233 } |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2234 |
| 342 | 2235 class SumUsedClosure: public HeapRegionClosure { |
| 2236 size_t _used; | |
| 2237 public: | |
| 2238 SumUsedClosure() : _used(0) {} | |
| 2239 bool doHeapRegion(HeapRegion* r) { | |
| 2240 if (!r->continuesHumongous()) { | |
| 2241 _used += r->used(); | |
| 2242 } | |
| 2243 return false; | |
| 2244 } | |
| 2245 size_t result() { return _used; } | |
| 2246 }; | |
| 2247 | |
| 2248 size_t G1CollectedHeap::recalculate_used() const { | |
| 2249 SumUsedClosure blk; | |
| 3766 | 2250 heap_region_iterate(&blk); |
| 342 | 2251 return blk.result(); |
| 2252 } | |
| 2253 | |
| 2254 size_t G1CollectedHeap::unsafe_max_alloc() { | |
| 2152 | 2255 if (free_regions() > 0) return HeapRegion::GrainBytes; |
| 342 | 2256 // otherwise, is there space in the current allocation region? |
| 2257 | |
| 2258 // We need to store the current allocation region in a local variable | |
| 2259 // here. The problem is that this method doesn't take any locks and | |
| 2260 // there may be other threads which overwrite the current allocation | |
| 2261 // region field. attempt_allocation(), for example, sets it to NULL | |
| 2262 // and this can happen *after* the NULL check here but before the call | |
| 2263 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
| 2264 // to be a problem in the optimized build, since the two loads of the | |
| 2265 // current allocation region field are optimized away. | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2266 HeapRegion* hr = _mutator_alloc_region.get(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2267 if (hr == NULL) { |
| 342 | 2268 return 0; |
| 2269 } | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2270 return hr->free(); |
| 342 | 2271 } |
| 2272 | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2273 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
|
2274 return |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2275 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2276 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2277 } |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2278 |
|
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2279 #ifndef PRODUCT |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2280 void G1CollectedHeap::allocate_dummy_regions() { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2281 // Let's fill up most of the region |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2282 size_t word_size = HeapRegion::GrainWords - 1024; |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2283 // 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
|
2284 guarantee(isHumongous(word_size), "sanity"); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2285 |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2286 for (uintx i = 0; i < G1DummyRegionsPerGC; ++i) { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2287 // 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
|
2288 HeapWord* dummy_obj = humongous_obj_allocate(word_size); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2289 if (dummy_obj != NULL) { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2290 MemRegion mr(dummy_obj, word_size); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2291 CollectedHeap::fill_with_object(mr); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2292 } else { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2293 // 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
|
2294 // again. Let's get out of the loop. |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2295 break; |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2296 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2297 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2298 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2299 #endif // !PRODUCT |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2300 |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2301 void G1CollectedHeap::increment_full_collections_completed(bool concurrent) { |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2302 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2303 |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2304 // We assume that if concurrent == true, then the caller is a |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2305 // concurrent thread that was joined the Suspendible Thread |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2306 // Set. If there's ever a cheap way to check this, we should add an |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2307 // assert here. |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2308 |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2309 // We have already incremented _total_full_collections at the start |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2310 // of the GC, so total_full_collections() represents how many full |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2311 // collections have been started. |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2312 unsigned int full_collections_started = total_full_collections(); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2313 |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2314 // Given that this method is called at the end of a Full GC or of a |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2315 // concurrent cycle, and those can be nested (i.e., a Full GC can |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2316 // interrupt a concurrent cycle), the number of full collections |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2317 // completed should be either one (in the case where there was no |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2318 // nesting) or two (when a Full GC interrupted a concurrent cycle) |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2319 // behind the number of full collections started. |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2320 |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2321 // This is the case for the inner caller, i.e. a Full GC. |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2322 assert(concurrent || |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2323 (full_collections_started == _full_collections_completed + 1) || |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2324 (full_collections_started == _full_collections_completed + 2), |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2325 err_msg("for inner caller (Full GC): full_collections_started = %u " |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2326 "is inconsistent with _full_collections_completed = %u", |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2327 full_collections_started, _full_collections_completed)); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2328 |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2329 // This is the case for the outer caller, i.e. the concurrent cycle. |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2330 assert(!concurrent || |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2331 (full_collections_started == _full_collections_completed + 1), |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2332 err_msg("for outer caller (concurrent cycle): " |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2333 "full_collections_started = %u " |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2334 "is inconsistent with _full_collections_completed = %u", |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2335 full_collections_started, _full_collections_completed)); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2336 |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2337 _full_collections_completed += 1; |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2338 |
|
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2339 // We need to clear the "in_progress" flag in the CM thread before |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2340 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2341 // is set) so that if a waiter requests another System.gc() it doesn't |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2342 // incorrectly see that a marking cyle is still in progress. |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2343 if (concurrent) { |
|
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2344 _cmThread->clear_in_progress(); |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2345 } |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2346 |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2347 // This notify_all() will ensure that a thread that called |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2348 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2349 // and it's waiting for a full GC to finish will be woken up. It is |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2350 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2351 FullGCCount_lock->notify_all(); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2352 } |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
changeset
|
2353 |
| 342 | 2354 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
| 2152 | 2355 assert_at_safepoint(true /* should_be_vm_thread */); |
| 342 | 2356 GCCauseSetter gcs(this, cause); |
| 2357 switch (cause) { | |
| 2358 case GCCause::_heap_inspection: | |
| 2359 case GCCause::_heap_dump: { | |
| 2360 HandleMark hm; | |
| 2361 do_full_collection(false); // don't clear all soft refs | |
| 2362 break; | |
| 2363 } | |
| 2364 default: // XXX FIX ME | |
| 2365 ShouldNotReachHere(); // Unexpected use of this function | |
| 2366 } | |
| 2367 } | |
| 2368 | |
|
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2369 void G1CollectedHeap::collect(GCCause::Cause cause) { |
|
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2370 // The caller doesn't have the Heap_lock |
|
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2371 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
|
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2372 |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
changeset
|
2373 unsigned int gc_count_before; |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2374 unsigned int full_gc_count_before; |
| 342 | 2375 { |
|
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2376 MutexLocker ml(Heap_lock); |
| 1973 | 2377 |
|
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2378 // Read the GC count while holding the Heap_lock |
|
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2379 gc_count_before = SharedHeap::heap()->total_collections(); |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2380 full_gc_count_before = SharedHeap::heap()->total_full_collections(); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2381 } |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2382 |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2383 if (should_do_concurrent_full_gc(cause)) { |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2384 // Schedule an initial-mark evacuation pause that will start a |
| 1973 | 2385 // concurrent cycle. We're setting word_size to 0 which means that |
| 2386 // we are not requesting a post-GC allocation. | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
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|
2387 VM_G1IncCollectionPause op(gc_count_before, |
| 1973 | 2388 0, /* word_size */ |
| 2389 true, /* should_initiate_conc_mark */ | |
|
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2390 g1_policy()->max_pause_time_ms(), |
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|
2391 cause); |
|
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2392 VMThread::execute(&op); |
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2393 } else { |
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2394 if (cause == GCCause::_gc_locker |
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2395 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
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2396 |
| 1973 | 2397 // Schedule a standard evacuation pause. We're setting word_size |
| 2398 // to 0 which means that we are not requesting a post-GC allocation. | |
|
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2399 VM_G1IncCollectionPause op(gc_count_before, |
| 1973 | 2400 0, /* word_size */ |
|
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2401 false, /* should_initiate_conc_mark */ |
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2402 g1_policy()->max_pause_time_ms(), |
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2403 cause); |
|
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2404 VMThread::execute(&op); |
|
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2405 } else { |
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2406 // Schedule a Full GC. |
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2407 VM_G1CollectFull op(gc_count_before, full_gc_count_before, cause); |
|
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2408 VMThread::execute(&op); |
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|
2409 } |
| 342 | 2410 } |
| 2411 } | |
| 2412 | |
| 2413 bool G1CollectedHeap::is_in(const void* p) const { | |
| 4708 | 2414 if (_g1_committed.contains(p)) { |
| 2415 // Given that we know that p is in the committed space, | |
| 2416 // heap_region_containing_raw() should successfully | |
| 2417 // return the containing region. | |
| 2418 HeapRegion* hr = heap_region_containing_raw(p); | |
| 342 | 2419 return hr->is_in(p); |
| 2420 } else { | |
| 2421 return _perm_gen->as_gen()->is_in(p); | |
| 2422 } | |
| 2423 } | |
| 2424 | |
| 2425 // Iteration functions. | |
| 2426 | |
| 2427 // Iterates an OopClosure over all ref-containing fields of objects | |
| 2428 // within a HeapRegion. | |
| 2429 | |
| 2430 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
| 2431 MemRegion _mr; | |
| 2432 OopClosure* _cl; | |
| 2433 public: | |
| 2434 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
| 2435 : _mr(mr), _cl(cl) {} | |
| 2436 bool doHeapRegion(HeapRegion* r) { | |
| 2437 if (! r->continuesHumongous()) { | |
| 2438 r->oop_iterate(_cl); | |
| 2439 } | |
| 2440 return false; | |
| 2441 } | |
| 2442 }; | |
| 2443 | |
| 678 | 2444 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
| 342 | 2445 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
| 3766 | 2446 heap_region_iterate(&blk); |
| 678 | 2447 if (do_perm) { |
| 2448 perm_gen()->oop_iterate(cl); | |
| 2449 } | |
| 342 | 2450 } |
| 2451 | |
| 678 | 2452 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
| 342 | 2453 IterateOopClosureRegionClosure blk(mr, cl); |
| 3766 | 2454 heap_region_iterate(&blk); |
| 678 | 2455 if (do_perm) { |
| 2456 perm_gen()->oop_iterate(cl); | |
| 2457 } | |
| 342 | 2458 } |
| 2459 | |
| 2460 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
| 2461 | |
| 2462 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
| 2463 ObjectClosure* _cl; | |
| 2464 public: | |
| 2465 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
| 2466 bool doHeapRegion(HeapRegion* r) { | |
| 2467 if (! r->continuesHumongous()) { | |
| 2468 r->object_iterate(_cl); | |
| 2469 } | |
| 2470 return false; | |
| 2471 } | |
| 2472 }; | |
| 2473 | |
| 678 | 2474 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
| 342 | 2475 IterateObjectClosureRegionClosure blk(cl); |
| 3766 | 2476 heap_region_iterate(&blk); |
| 678 | 2477 if (do_perm) { |
| 2478 perm_gen()->object_iterate(cl); | |
| 2479 } | |
| 342 | 2480 } |
| 2481 | |
| 2482 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
| 2483 // FIXME: is this right? | |
| 2484 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
| 2485 } | |
| 2486 | |
| 2487 // Calls a SpaceClosure on a HeapRegion. | |
| 2488 | |
| 2489 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
| 2490 SpaceClosure* _cl; | |
| 2491 public: | |
| 2492 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
| 2493 bool doHeapRegion(HeapRegion* r) { | |
| 2494 _cl->do_space(r); | |
| 2495 return false; | |
| 2496 } | |
| 2497 }; | |
| 2498 | |
| 2499 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
| 2500 SpaceClosureRegionClosure blk(cl); | |
| 3766 | 2501 heap_region_iterate(&blk); |
| 342 | 2502 } |
| 2503 | |
| 3766 | 2504 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const { |
| 2505 _hrs.iterate(cl); | |
| 342 | 2506 } |
| 2507 | |
| 2508 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
| 3766 | 2509 HeapRegionClosure* cl) const { |
| 2510 _hrs.iterate_from(r, cl); | |
| 342 | 2511 } |
| 2512 | |
| 2513 void | |
| 2514 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
| 2515 int worker, | |
|
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2516 int no_of_par_workers, |
| 342 | 2517 jint claim_value) { |
| 355 | 2518 const size_t regions = n_regions(); |
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2519 const size_t max_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
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2520 no_of_par_workers : |
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2521 1); |
|
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2522 assert(UseDynamicNumberOfGCThreads || |
|
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|
2523 no_of_par_workers == workers()->total_workers(), |
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2524 "Non dynamic should use fixed number of workers"); |
| 355 | 2525 // try to spread out the starting points of the workers |
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2526 const size_t start_index = regions / max_workers * (size_t) worker; |
| 355 | 2527 |
| 2528 // each worker will actually look at all regions | |
| 2529 for (size_t count = 0; count < regions; ++count) { | |
| 2530 const size_t index = (start_index + count) % regions; | |
| 2531 assert(0 <= index && index < regions, "sanity"); | |
| 2532 HeapRegion* r = region_at(index); | |
| 2533 // we'll ignore "continues humongous" regions (we'll process them | |
| 2534 // when we come across their corresponding "start humongous" | |
| 2535 // region) and regions already claimed | |
| 2536 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
| 2537 continue; | |
| 2538 } | |
| 2539 // OK, try to claim it | |
| 342 | 2540 if (r->claimHeapRegion(claim_value)) { |
| 355 | 2541 // success! |
| 2542 assert(!r->continuesHumongous(), "sanity"); | |
| 2543 if (r->startsHumongous()) { | |
| 2544 // If the region is "starts humongous" we'll iterate over its | |
| 2545 // "continues humongous" first; in fact we'll do them | |
| 2546 // first. The order is important. In on case, calling the | |
| 2547 // closure on the "starts humongous" region might de-allocate | |
| 2548 // and clear all its "continues humongous" regions and, as a | |
| 2549 // result, we might end up processing them twice. So, we'll do | |
| 2550 // them first (notice: most closures will ignore them anyway) and | |
| 2551 // then we'll do the "starts humongous" region. | |
| 2552 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
| 2553 HeapRegion* chr = region_at(ch_index); | |
| 2554 | |
| 2555 // if the region has already been claimed or it's not | |
| 2556 // "continues humongous" we're done | |
| 2557 if (chr->claim_value() == claim_value || | |
| 2558 !chr->continuesHumongous()) { | |
| 2559 break; | |
| 2560 } | |
| 2561 | |
| 2562 // Noone should have claimed it directly. We can given | |
| 2563 // that we claimed its "starts humongous" region. | |
| 2564 assert(chr->claim_value() != claim_value, "sanity"); | |
| 2565 assert(chr->humongous_start_region() == r, "sanity"); | |
| 2566 | |
| 2567 if (chr->claimHeapRegion(claim_value)) { | |
| 2568 // we should always be able to claim it; noone else should | |
| 2569 // be trying to claim this region | |
| 2570 | |
| 2571 bool res2 = cl->doHeapRegion(chr); | |
| 2572 assert(!res2, "Should not abort"); | |
| 2573 | |
| 2574 // Right now, this holds (i.e., no closure that actually | |
| 2575 // does something with "continues humongous" regions | |
| 2576 // clears them). We might have to weaken it in the future, | |
| 2577 // but let's leave these two asserts here for extra safety. | |
| 2578 assert(chr->continuesHumongous(), "should still be the case"); | |
| 2579 assert(chr->humongous_start_region() == r, "sanity"); | |
| 2580 } else { | |
| 2581 guarantee(false, "we should not reach here"); | |
| 2582 } | |
| 2583 } | |
| 2584 } | |
| 2585 | |
| 2586 assert(!r->continuesHumongous(), "sanity"); | |
| 2587 bool res = cl->doHeapRegion(r); | |
| 2588 assert(!res, "Should not abort"); | |
| 2589 } | |
| 2590 } | |
| 2591 } | |
| 2592 | |
| 390 | 2593 class ResetClaimValuesClosure: public HeapRegionClosure { |
| 2594 public: | |
| 2595 bool doHeapRegion(HeapRegion* r) { | |
| 2596 r->set_claim_value(HeapRegion::InitialClaimValue); | |
| 2597 return false; | |
| 2598 } | |
| 2599 }; | |
| 2600 | |
| 2601 void | |
| 2602 G1CollectedHeap::reset_heap_region_claim_values() { | |
| 2603 ResetClaimValuesClosure blk; | |
| 2604 heap_region_iterate(&blk); | |
| 2605 } | |
| 2606 | |
| 355 | 2607 #ifdef ASSERT |
| 2608 // This checks whether all regions in the heap have the correct claim | |
| 2609 // value. I also piggy-backed on this a check to ensure that the | |
| 2610 // humongous_start_region() information on "continues humongous" | |
| 2611 // regions is correct. | |
| 2612 | |
| 2613 class CheckClaimValuesClosure : public HeapRegionClosure { | |
| 2614 private: | |
| 2615 jint _claim_value; | |
| 2616 size_t _failures; | |
| 2617 HeapRegion* _sh_region; | |
| 2618 public: | |
| 2619 CheckClaimValuesClosure(jint claim_value) : | |
| 2620 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
| 2621 bool doHeapRegion(HeapRegion* r) { | |
| 2622 if (r->claim_value() != _claim_value) { | |
|
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2623 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
| 355 | 2624 "claim value = %d, should be %d", |
|
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2625 HR_FORMAT_PARAMS(r), |
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2626 r->claim_value(), _claim_value); |
| 355 | 2627 ++_failures; |
| 2628 } | |
| 2629 if (!r->isHumongous()) { | |
| 2630 _sh_region = NULL; | |
| 2631 } else if (r->startsHumongous()) { | |
| 2632 _sh_region = r; | |
| 2633 } else if (r->continuesHumongous()) { | |
| 2634 if (r->humongous_start_region() != _sh_region) { | |
|
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2635 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
| 355 | 2636 "HS = "PTR_FORMAT", should be "PTR_FORMAT, |
|
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2637 HR_FORMAT_PARAMS(r), |
| 355 | 2638 r->humongous_start_region(), |
| 2639 _sh_region); | |
| 2640 ++_failures; | |
| 342 | 2641 } |
| 2642 } | |
| 355 | 2643 return false; |
| 2644 } | |
| 2645 size_t failures() { | |
| 2646 return _failures; | |
| 2647 } | |
| 2648 }; | |
| 2649 | |
| 2650 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
| 2651 CheckClaimValuesClosure cl(claim_value); | |
| 2652 heap_region_iterate(&cl); | |
| 2653 return cl.failures() == 0; | |
| 2654 } | |
|
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2655 |
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2656 class CheckClaimValuesInCSetHRClosure: public HeapRegionClosure { |
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2657 jint _claim_value; |
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2658 size_t _failures; |
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2659 |
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2660 public: |
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2661 CheckClaimValuesInCSetHRClosure(jint claim_value) : |
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2662 _claim_value(claim_value), |
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2663 _failures(0) { } |
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2664 |
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2665 size_t failures() { |
|
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2666 return _failures; |
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2667 } |
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2668 |
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2669 bool doHeapRegion(HeapRegion* hr) { |
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2670 assert(hr->in_collection_set(), "how?"); |
|
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2671 assert(!hr->isHumongous(), "H-region in CSet"); |
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2672 if (hr->claim_value() != _claim_value) { |
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2673 gclog_or_tty->print_cr("CSet Region " HR_FORMAT ", " |
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2674 "claim value = %d, should be %d", |
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2675 HR_FORMAT_PARAMS(hr), |
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2676 hr->claim_value(), _claim_value); |
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2677 _failures += 1; |
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2678 } |
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2679 return false; |
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2680 } |
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2681 }; |
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2682 |
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2683 bool G1CollectedHeap::check_cset_heap_region_claim_values(jint claim_value) { |
|
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2684 CheckClaimValuesInCSetHRClosure cl(claim_value); |
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2685 collection_set_iterate(&cl); |
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2686 return cl.failures() == 0; |
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2687 } |
| 355 | 2688 #endif // ASSERT |
| 342 | 2689 |
|
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2690 // We want the parallel threads to start their collection |
|
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|
2691 // set iteration at different collection set regions to |
|
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|
2692 // avoid contention. |
|
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|
2693 // If we have: |
|
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|
2694 // n collection set regions |
|
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|
2695 // p threads |
|
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|
2696 // Then thread t will start at region t * floor (n/p) |
|
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|
2697 |
|
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|
2698 HeapRegion* G1CollectedHeap::start_cset_region_for_worker(int worker_i) { |
|
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|
2699 HeapRegion* result = g1_policy()->collection_set(); |
|
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|
2700 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
2701 size_t cs_size = g1_policy()->cset_region_length(); |
|
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2702 int n_workers = workers()->total_workers(); |
|
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|
2703 size_t cs_spans = cs_size / n_workers; |
|
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|
2704 size_t ind = cs_spans * worker_i; |
|
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|
2705 for (size_t i = 0; i < ind; i++) { |
|
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|
2706 result = result->next_in_collection_set(); |
|
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|
2707 } |
|
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|
2708 } |
|
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|
2709 return result; |
|
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|
2710 } |
|
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|
2711 |
| 342 | 2712 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { |
| 2713 HeapRegion* r = g1_policy()->collection_set(); | |
| 2714 while (r != NULL) { | |
| 2715 HeapRegion* next = r->next_in_collection_set(); | |
| 2716 if (cl->doHeapRegion(r)) { | |
| 2717 cl->incomplete(); | |
| 2718 return; | |
| 2719 } | |
| 2720 r = next; | |
| 2721 } | |
| 2722 } | |
| 2723 | |
| 2724 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
| 2725 HeapRegionClosure *cl) { | |
|
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|
2726 if (r == NULL) { |
|
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|
2727 // The CSet is empty so there's nothing to do. |
|
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|
2728 return; |
|
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|
2729 } |
|
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|
2730 |
| 342 | 2731 assert(r->in_collection_set(), |
| 2732 "Start region must be a member of the collection set."); | |
| 2733 HeapRegion* cur = r; | |
| 2734 while (cur != NULL) { | |
| 2735 HeapRegion* next = cur->next_in_collection_set(); | |
| 2736 if (cl->doHeapRegion(cur) && false) { | |
| 2737 cl->incomplete(); | |
| 2738 return; | |
| 2739 } | |
| 2740 cur = next; | |
| 2741 } | |
| 2742 cur = g1_policy()->collection_set(); | |
| 2743 while (cur != r) { | |
| 2744 HeapRegion* next = cur->next_in_collection_set(); | |
| 2745 if (cl->doHeapRegion(cur) && false) { | |
| 2746 cl->incomplete(); | |
| 2747 return; | |
| 2748 } | |
| 2749 cur = next; | |
| 2750 } | |
| 2751 } | |
| 2752 | |
| 2753 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
| 3766 | 2754 return n_regions() > 0 ? region_at(0) : NULL; |
| 342 | 2755 } |
| 2756 | |
| 2757 | |
| 2758 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
| 2759 Space* res = heap_region_containing(addr); | |
| 2760 if (res == NULL) | |
| 2761 res = perm_gen()->space_containing(addr); | |
| 2762 return res; | |
| 2763 } | |
| 2764 | |
| 2765 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
| 2766 Space* sp = space_containing(addr); | |
| 2767 if (sp != NULL) { | |
| 2768 return sp->block_start(addr); | |
| 2769 } | |
| 2770 return NULL; | |
| 2771 } | |
| 2772 | |
| 2773 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
| 2774 Space* sp = space_containing(addr); | |
| 2775 assert(sp != NULL, "block_size of address outside of heap"); | |
| 2776 return sp->block_size(addr); | |
| 2777 } | |
| 2778 | |
| 2779 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
| 2780 Space* sp = space_containing(addr); | |
| 2781 return sp->block_is_obj(addr); | |
| 2782 } | |
| 2783 | |
| 2784 bool G1CollectedHeap::supports_tlab_allocation() const { | |
| 2785 return true; | |
| 2786 } | |
| 2787 | |
| 2788 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
| 2789 return HeapRegion::GrainBytes; | |
| 2790 } | |
| 2791 | |
| 2792 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
| 2793 // Return the remaining space in the cur alloc region, but not less than | |
| 2794 // the min TLAB size. | |
|
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2795 |
|
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|
2796 // Also, this value can be at most the humongous object threshold, |
|
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|
2797 // since we can't allow tlabs to grow big enough to accomodate |
|
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|
2798 // humongous objects. |
|
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|
2799 |
|
2433
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|
2800 HeapRegion* hr = _mutator_alloc_region.get(); |
|
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|
2801 size_t max_tlab_size = _humongous_object_threshold_in_words * wordSize; |
|
2433
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|
2802 if (hr == NULL) { |
|
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|
2803 return max_tlab_size; |
| 342 | 2804 } else { |
|
2433
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|
2805 return MIN2(MAX2(hr->free(), (size_t) MinTLABSize), max_tlab_size); |
| 342 | 2806 } |
| 2807 } | |
| 2808 | |
| 2809 size_t G1CollectedHeap::max_capacity() const { | |
|
2188
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6923430: G1: assert(res != 0,"This should have worked.")
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changeset
|
2810 return _g1_reserved.byte_size(); |
| 342 | 2811 } |
| 2812 | |
| 2813 jlong G1CollectedHeap::millis_since_last_gc() { | |
| 2814 // assert(false, "NYI"); | |
| 2815 return 0; | |
| 2816 } | |
| 2817 | |
| 2818 void G1CollectedHeap::prepare_for_verify() { | |
| 2819 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
| 2820 ensure_parsability(false); | |
| 2821 } | |
| 2822 g1_rem_set()->prepare_for_verify(); | |
| 2823 } | |
| 2824 | |
| 2825 class VerifyLivenessOopClosure: public OopClosure { | |
|
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|
2826 G1CollectedHeap* _g1h; |
|
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|
2827 VerifyOption _vo; |
| 342 | 2828 public: |
|
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|
2829 VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo): |
|
6747fd0512e0
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|
2830 _g1h(g1h), _vo(vo) |
|
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|
2831 { } |
|
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|
2832 void do_oop(narrowOop *p) { do_oop_work(p); } |
|
df6caf649ff7
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|
2833 void do_oop( oop *p) { do_oop_work(p); } |
|
df6caf649ff7
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|
2834 |
|
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|
2835 template <class T> void do_oop_work(T *p) { |
|
df6caf649ff7
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diff
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|
2836 oop obj = oopDesc::load_decode_heap_oop(p); |
|
3772
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|
2837 guarantee(obj == NULL || !_g1h->is_obj_dead_cond(obj, _vo), |
|
845
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|
2838 "Dead object referenced by a not dead object"); |
| 342 | 2839 } |
| 2840 }; | |
| 2841 | |
| 2842 class VerifyObjsInRegionClosure: public ObjectClosure { | |
| 811 | 2843 private: |
| 342 | 2844 G1CollectedHeap* _g1h; |
| 2845 size_t _live_bytes; | |
| 2846 HeapRegion *_hr; | |
|
3772
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changeset
|
2847 VerifyOption _vo; |
| 342 | 2848 public: |
|
3772
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|
2849 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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diff
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|
2850 // _vo == UseNextMarking -> use "next" marking information, |
|
6747fd0512e0
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|
2851 // _vo == UseMarkWord -> use mark word from object header. |
|
6747fd0512e0
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|
2852 VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo) |
|
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|
2853 : _live_bytes(0), _hr(hr), _vo(vo) { |
| 342 | 2854 _g1h = G1CollectedHeap::heap(); |
| 2855 } | |
| 2856 void do_object(oop o) { | |
|
3772
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changeset
|
2857 VerifyLivenessOopClosure isLive(_g1h, _vo); |
| 342 | 2858 assert(o != NULL, "Huh?"); |
|
3772
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|
2859 if (!_g1h->is_obj_dead_cond(o, _vo)) { |
|
6747fd0512e0
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diff
changeset
|
2860 // If the object is alive according to the mark word, |
|
6747fd0512e0
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diff
changeset
|
2861 // then verify that the marking information agrees. |
|
6747fd0512e0
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diff
changeset
|
2862 // Note we can't verify the contra-positive of the |
|
6747fd0512e0
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diff
changeset
|
2863 // above: if the object is dead (according to the mark |
|
6747fd0512e0
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diff
changeset
|
2864 // word), it may not be marked, or may have been marked |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
changeset
|
2865 // but has since became dead, or may have been allocated |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
changeset
|
2866 // since the last marking. |
|
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diff
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|
2867 if (_vo == VerifyOption_G1UseMarkWord) { |
|
6747fd0512e0
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diff
changeset
|
2868 guarantee(!_g1h->is_obj_dead(o), "mark word and concurrent mark mismatch"); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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|
2869 } |
|
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|
2870 |
| 342 | 2871 o->oop_iterate(&isLive); |
|
1389
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6943926: G1: Integer overflow during heap region verification
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|
2872 if (!_hr->obj_allocated_since_prev_marking(o)) { |
|
5dbd9300cf9c
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diff
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|
2873 size_t obj_size = o->size(); // Make sure we don't overflow |
|
5dbd9300cf9c
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diff
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|
2874 _live_bytes += (obj_size * HeapWordSize); |
|
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|
2875 } |
| 342 | 2876 } |
| 2877 } | |
| 2878 size_t live_bytes() { return _live_bytes; } | |
| 2879 }; | |
| 2880 | |
| 2881 class PrintObjsInRegionClosure : public ObjectClosure { | |
| 2882 HeapRegion *_hr; | |
| 2883 G1CollectedHeap *_g1; | |
| 2884 public: | |
| 2885 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
| 2886 _g1 = G1CollectedHeap::heap(); | |
| 2887 }; | |
| 2888 | |
| 2889 void do_object(oop o) { | |
| 2890 if (o != NULL) { | |
| 2891 HeapWord *start = (HeapWord *) o; | |
| 2892 size_t word_sz = o->size(); | |
| 2893 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
| 2894 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
| 2895 (void*) o, word_sz, | |
| 2896 _g1->isMarkedPrev(o), | |
| 2897 _g1->isMarkedNext(o), | |
| 2898 _hr->obj_allocated_since_prev_marking(o)); | |
| 2899 HeapWord *end = start + word_sz; | |
| 2900 HeapWord *cur; | |
| 2901 int *val; | |
| 2902 for (cur = start; cur < end; cur++) { | |
| 2903 val = (int *) cur; | |
| 2904 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
| 2905 } | |
| 2906 } | |
| 2907 } | |
| 2908 }; | |
| 2909 | |
| 2910 class VerifyRegionClosure: public HeapRegionClosure { | |
| 811 | 2911 private: |
|
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|
2912 bool _allow_dirty; |
|
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|
2913 bool _par; |
|
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|
2914 VerifyOption _vo; |
|
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|
2915 bool _failures; |
| 811 | 2916 public: |
|
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|
2917 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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|
2918 // _vo == UseNextMarking -> use "next" marking information, |
|
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|
2919 // _vo == UseMarkWord -> use mark word from object header. |
|
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|
2920 VerifyRegionClosure(bool allow_dirty, bool par, VerifyOption vo) |
|
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|
2921 : _allow_dirty(allow_dirty), |
|
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|
2922 _par(par), |
|
3772
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|
2923 _vo(vo), |
|
1020
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|
2924 _failures(false) {} |
|
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|
2925 |
|
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|
2926 bool failures() { |
|
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|
2927 return _failures; |
|
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|
2928 } |
|
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|
2929 |
| 342 | 2930 bool doHeapRegion(HeapRegion* r) { |
| 390 | 2931 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
| 2932 "Should be unclaimed at verify points."); | |
|
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|
2933 if (!r->continuesHumongous()) { |
|
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|
2934 bool failures = false; |
|
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|
2935 r->verify(_allow_dirty, _vo, &failures); |
|
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|
2936 if (failures) { |
|
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|
2937 _failures = true; |
|
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|
2938 } else { |
|
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|
2939 VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo); |
|
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|
2940 r->object_iterate(¬_dead_yet_cl); |
|
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|
2941 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
|
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|
2942 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
|
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|
2943 "max_live_bytes "SIZE_FORMAT" " |
|
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|
2944 "< calculated "SIZE_FORMAT, |
|
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|
2945 r->bottom(), r->end(), |
|
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|
2946 r->max_live_bytes(), |
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|
2947 not_dead_yet_cl.live_bytes()); |
|
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|
2948 _failures = true; |
|
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|
2949 } |
|
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|
2950 } |
| 342 | 2951 } |
|
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|
2952 return false; // stop the region iteration if we hit a failure |
| 342 | 2953 } |
| 2954 }; | |
| 2955 | |
| 2956 class VerifyRootsClosure: public OopsInGenClosure { | |
| 2957 private: | |
| 2958 G1CollectedHeap* _g1h; | |
|
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|
2959 VerifyOption _vo; |
| 342 | 2960 bool _failures; |
| 2961 public: | |
|
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2962 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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|
2963 // _vo == UseNextMarking -> use "next" marking information, |
|
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|
2964 // _vo == UseMarkWord -> use mark word from object header. |
|
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|
2965 VerifyRootsClosure(VerifyOption vo) : |
|
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|
2966 _g1h(G1CollectedHeap::heap()), |
|
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|
2967 _vo(vo), |
|
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|
2968 _failures(false) { } |
| 342 | 2969 |
| 2970 bool failures() { return _failures; } | |
| 2971 | |
|
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|
2972 template <class T> void do_oop_nv(T* p) { |
|
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|
2973 T heap_oop = oopDesc::load_heap_oop(p); |
|
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|
2974 if (!oopDesc::is_null(heap_oop)) { |
|
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|
2975 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
|
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|
2976 if (_g1h->is_obj_dead_cond(obj, _vo)) { |
| 342 | 2977 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
|
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|
2978 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
|
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|
2979 if (_vo == VerifyOption_G1UseMarkWord) { |
|
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|
2980 gclog_or_tty->print_cr(" Mark word: "PTR_FORMAT, (void*)(obj->mark())); |
|
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|
2981 } |
| 342 | 2982 obj->print_on(gclog_or_tty); |
| 2983 _failures = true; | |
| 2984 } | |
| 2985 } | |
| 2986 } | |
|
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|
2987 |
|
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|
2988 void do_oop(oop* p) { do_oop_nv(p); } |
|
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|
2989 void do_oop(narrowOop* p) { do_oop_nv(p); } |
| 342 | 2990 }; |
| 2991 | |
| 390 | 2992 // This is the task used for parallel heap verification. |
| 2993 | |
| 2994 class G1ParVerifyTask: public AbstractGangTask { | |
| 2995 private: | |
| 2996 G1CollectedHeap* _g1h; | |
|
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|
2997 bool _allow_dirty; |
|
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|
2998 VerifyOption _vo; |
|
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|
2999 bool _failures; |
| 390 | 3000 |
| 3001 public: | |
|
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|
3002 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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|
3003 // _vo == UseNextMarking -> use "next" marking information, |
|
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|
3004 // _vo == UseMarkWord -> use mark word from object header. |
|
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|
3005 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, VerifyOption vo) : |
| 390 | 3006 AbstractGangTask("Parallel verify task"), |
|
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|
3007 _g1h(g1h), |
|
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|
3008 _allow_dirty(allow_dirty), |
|
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|
3009 _vo(vo), |
|
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|
3010 _failures(false) { } |
|
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|
3011 |
|
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|
3012 bool failures() { |
|
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|
3013 return _failures; |
|
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|
3014 } |
| 390 | 3015 |
| 3016 void work(int worker_i) { | |
|
637
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6817419: G1: Enable extensive verification for humongous regions
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|
3017 HandleMark hm; |
|
3772
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changeset
|
3018 VerifyRegionClosure blk(_allow_dirty, true, _vo); |
| 390 | 3019 _g1h->heap_region_par_iterate_chunked(&blk, worker_i, |
|
4095
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|
3020 _g1h->workers()->active_workers(), |
| 390 | 3021 HeapRegion::ParVerifyClaimValue); |
|
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|
3022 if (blk.failures()) { |
|
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|
3023 _failures = true; |
|
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|
3024 } |
| 390 | 3025 } |
| 3026 }; | |
| 3027 | |
| 342 | 3028 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
|
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changeset
|
3029 verify(allow_dirty, silent, VerifyOption_G1UsePrevMarking); |
| 811 | 3030 } |
| 3031 | |
| 3032 void G1CollectedHeap::verify(bool allow_dirty, | |
| 3033 bool silent, | |
|
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|
3034 VerifyOption vo) { |
| 342 | 3035 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
|
3293
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|
3036 if (!silent) { gclog_or_tty->print("Roots (excluding permgen) "); } |
|
3772
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|
3037 VerifyRootsClosure rootsCl(vo); |
|
4095
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|
3038 |
|
bca17e38de00
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changeset
|
3039 assert(Thread::current()->is_VM_thread(), |
|
bca17e38de00
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|
3040 "Expected to be executed serially by the VM thread at this point"); |
|
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|
3041 |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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890
diff
changeset
|
3042 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
|
3772
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|
3043 |
|
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changeset
|
3044 // We apply the relevant closures to all the oops in the |
|
1f4413413144
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changeset
|
3045 // system dictionary, the string table and the code cache. |
|
1f4413413144
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diff
changeset
|
3046 const int so = SharedHeap::SO_AllClasses | SharedHeap::SO_Strings | SharedHeap::SO_CodeCache; |
|
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|
3047 |
|
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changeset
|
3048 process_strong_roots(true, // activate StrongRootsScope |
|
1f4413413144
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|
3049 true, // we set "collecting perm gen" to true, |
|
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|
3050 // so we don't reset the dirty cards in the perm gen. |
|
1f4413413144
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changeset
|
3051 SharedHeap::ScanningOption(so), // roots scanning options |
| 342 | 3052 &rootsCl, |
|
989
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|
3053 &blobsCl, |
| 342 | 3054 &rootsCl); |
|
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|
3055 |
|
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changeset
|
3056 // If we're verifying after the marking phase of a Full GC then we can't |
|
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|
3057 // treat the perm gen as roots into the G1 heap. Some of the objects in |
|
6747fd0512e0
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|
3058 // the perm gen may be dead and hence not marked. If one of these dead |
|
6747fd0512e0
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diff
changeset
|
3059 // objects is considered to be a root then we may end up with a false |
|
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|
3060 // "Root location <x> points to dead ob <y>" failure. |
|
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diff
changeset
|
3061 if (vo != VerifyOption_G1UseMarkWord) { |
|
6747fd0512e0
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diff
changeset
|
3062 // Since we used "collecting_perm_gen" == true above, we will not have |
|
6747fd0512e0
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changeset
|
3063 // checked the refs from perm into the G1-collected heap. We check those |
|
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changeset
|
3064 // references explicitly below. Whether the relevant cards are dirty |
|
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diff
changeset
|
3065 // is checked further below in the rem set verification. |
|
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diff
changeset
|
3066 if (!silent) { gclog_or_tty->print("Permgen roots "); } |
|
6747fd0512e0
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changeset
|
3067 perm_gen()->oop_iterate(&rootsCl); |
|
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diff
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|
3068 } |
|
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|
3069 bool failures = rootsCl.failures(); |
|
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|
3070 |
|
6747fd0512e0
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changeset
|
3071 if (vo != VerifyOption_G1UseMarkWord) { |
|
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changeset
|
3072 // If we're verifying during a full GC then the region sets |
|
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changeset
|
3073 // will have been torn down at the start of the GC. Therefore |
|
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changeset
|
3074 // verifying the region sets will fail. So we only verify |
|
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diff
changeset
|
3075 // the region sets when not in a full GC. |
|
6747fd0512e0
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diff
changeset
|
3076 if (!silent) { gclog_or_tty->print("HeapRegionSets "); } |
|
6747fd0512e0
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changeset
|
3077 verify_region_sets(); |
|
6747fd0512e0
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johnc
parents:
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|
3078 } |
|
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|
3079 |
| 2152 | 3080 if (!silent) { gclog_or_tty->print("HeapRegions "); } |
| 390 | 3081 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
| 3082 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 3083 "sanity check"); | |
| 3084 | |
|
3772
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|
3085 G1ParVerifyTask task(this, allow_dirty, vo); |
|
4095
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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
3086 assert(UseDynamicNumberOfGCThreads || |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
3087 workers()->active_workers() == workers()->total_workers(), |
|
bca17e38de00
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|
3088 "If not dynamic should be using all the workers"); |
|
bca17e38de00
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|
3089 int n_workers = workers()->active_workers(); |
| 390 | 3090 set_par_threads(n_workers); |
| 3091 workers()->run_task(&task); | |
| 3092 set_par_threads(0); | |
|
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|
3093 if (task.failures()) { |
|
ff2402f6a50b
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|
3094 failures = true; |
|
ff2402f6a50b
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|
3095 } |
| 390 | 3096 |
|
4095
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|
3097 // Checks that the expected amount of parallel work was done. |
|
bca17e38de00
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|
3098 // The implication is that n_workers is > 0. |
| 390 | 3099 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), |
| 3100 "sanity check"); | |
| 3101 | |
| 3102 reset_heap_region_claim_values(); | |
| 3103 | |
| 3104 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 3105 "sanity check"); | |
| 3106 } else { | |
|
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|
3107 VerifyRegionClosure blk(allow_dirty, false, vo); |
| 3766 | 3108 heap_region_iterate(&blk); |
|
1020
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|
3109 if (blk.failures()) { |
|
ff2402f6a50b
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|
3110 failures = true; |
|
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|
3111 } |
| 390 | 3112 } |
| 2152 | 3113 if (!silent) gclog_or_tty->print("RemSet "); |
| 342 | 3114 rem_set()->verify(); |
|
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|
3115 |
|
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|
3116 if (failures) { |
|
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|
3117 gclog_or_tty->print_cr("Heap:"); |
|
4073
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|
3118 // It helps to have the per-region information in the output to |
|
53074c2c4600
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|
3119 // help us track down what went wrong. This is why we call |
|
53074c2c4600
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|
3120 // print_extended_on() instead of print_on(). |
|
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|
3121 print_extended_on(gclog_or_tty); |
|
1020
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|
3122 gclog_or_tty->print_cr(""); |
|
1547
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jcoomes
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|
3123 #ifndef PRODUCT |
| 1044 | 3124 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
| 1388 | 3125 concurrent_mark()->print_reachable("at-verification-failure", |
|
3772
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|
3126 vo, false /* all */); |
|
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|
3127 } |
|
1547
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|
3128 #endif |
|
1020
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|
3129 gclog_or_tty->flush(); |
|
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|
3130 } |
|
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|
3131 guarantee(!failures, "there should not have been any failures"); |
| 342 | 3132 } else { |
| 3133 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
| 3134 } | |
| 3135 } | |
| 3136 | |
| 3137 class PrintRegionClosure: public HeapRegionClosure { | |
| 3138 outputStream* _st; | |
| 3139 public: | |
| 3140 PrintRegionClosure(outputStream* st) : _st(st) {} | |
| 3141 bool doHeapRegion(HeapRegion* r) { | |
| 3142 r->print_on(_st); | |
| 3143 return false; | |
| 3144 } | |
| 3145 }; | |
| 3146 | |
| 3147 void G1CollectedHeap::print_on(outputStream* st) const { | |
|
838
0316eac49d5a
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|
3148 st->print(" %-20s", "garbage-first heap"); |
|
0316eac49d5a
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|
3149 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
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diff
changeset
|
3150 capacity()/K, used_unlocked()/K); |
|
838
0316eac49d5a
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|
3151 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
|
0316eac49d5a
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|
3152 _g1_storage.low_boundary(), |
|
0316eac49d5a
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|
3153 _g1_storage.high(), |
|
0316eac49d5a
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|
3154 _g1_storage.high_boundary()); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3155 st->cr(); |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3983
diff
changeset
|
3156 st->print(" region size " SIZE_FORMAT "K, ", HeapRegion::GrainBytes / K); |
|
838
0316eac49d5a
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|
3157 size_t young_regions = _young_list->length(); |
|
0316eac49d5a
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|
3158 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
|
0316eac49d5a
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|
3159 young_regions, young_regions * HeapRegion::GrainBytes / K); |
|
0316eac49d5a
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|
3160 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
|
0316eac49d5a
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|
3161 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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changeset
|
3162 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3163 st->cr(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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changeset
|
3164 perm()->as_gen()->print_on(st); |
|
4073
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|
3165 } |
|
53074c2c4600
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|
3166 |
|
53074c2c4600
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|
3167 void G1CollectedHeap::print_extended_on(outputStream* st) const { |
|
53074c2c4600
7099849: G1: include heap region information in hs_err files
tonyp
parents:
4072
diff
changeset
|
3168 print_on(st); |
|
53074c2c4600
7099849: G1: include heap region information in hs_err files
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parents:
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diff
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|
3169 |
|
53074c2c4600
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|
3170 // Print the per-region information. |
|
53074c2c4600
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|
3171 st->cr(); |
|
53074c2c4600
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|
3172 st->print_cr("Heap Regions: (Y=young(eden), SU=young(survivor), HS=humongous(starts), HC=humongous(continues), CS=collection set, F=free, TS=gc time stamp, PTAMS=previous top-at-mark-start, NTAMS=next top-at-mark-start)"); |
| 342 | 3173 PrintRegionClosure blk(st); |
| 3766 | 3174 heap_region_iterate(&blk); |
| 342 | 3175 } |
| 3176 | |
| 3177 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
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1755
diff
changeset
|
3178 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 1019 | 3179 workers()->print_worker_threads_on(st); |
| 3180 } | |
| 3181 _cmThread->print_on(st); | |
| 342 | 3182 st->cr(); |
| 1019 | 3183 _cm->print_worker_threads_on(st); |
| 3184 _cg1r->print_worker_threads_on(st); | |
| 342 | 3185 st->cr(); |
| 3186 } | |
| 3187 | |
| 3188 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
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1755
diff
changeset
|
3189 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3190 workers()->threads_do(tc); |
| 3191 } | |
| 3192 tc->do_thread(_cmThread); | |
| 794 | 3193 _cg1r->threads_do(tc); |
| 342 | 3194 } |
| 3195 | |
| 3196 void G1CollectedHeap::print_tracing_info() const { | |
| 3197 // We'll overload this to mean "trace GC pause statistics." | |
| 3198 if (TraceGen0Time || TraceGen1Time) { | |
| 3199 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
| 3200 // to that. | |
| 3201 g1_policy()->print_tracing_info(); | |
| 3202 } | |
| 751 | 3203 if (G1SummarizeRSetStats) { |
| 342 | 3204 g1_rem_set()->print_summary_info(); |
| 3205 } | |
| 1282 | 3206 if (G1SummarizeConcMark) { |
| 342 | 3207 concurrent_mark()->print_summary_info(); |
| 3208 } | |
| 3209 g1_policy()->print_yg_surv_rate_info(); | |
| 3210 SpecializationStats::print(); | |
| 3211 } | |
| 3212 | |
|
3777
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diff
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|
3213 #ifndef PRODUCT |
|
e8b0b0392037
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3774
diff
changeset
|
3214 // Helpful for debugging RSet issues. |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3215 |
|
e8b0b0392037
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|
3216 class PrintRSetsClosure : public HeapRegionClosure { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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changeset
|
3217 private: |
|
e8b0b0392037
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diff
changeset
|
3218 const char* _msg; |
|
e8b0b0392037
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changeset
|
3219 size_t _occupied_sum; |
|
e8b0b0392037
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changeset
|
3220 |
|
e8b0b0392037
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changeset
|
3221 public: |
|
e8b0b0392037
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|
3222 bool doHeapRegion(HeapRegion* r) { |
|
e8b0b0392037
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|
3223 HeapRegionRemSet* hrrs = r->rem_set(); |
|
e8b0b0392037
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|
3224 size_t occupied = hrrs->occupied(); |
|
e8b0b0392037
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3774
diff
changeset
|
3225 _occupied_sum += occupied; |
|
e8b0b0392037
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changeset
|
3226 |
|
e8b0b0392037
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changeset
|
3227 gclog_or_tty->print_cr("Printing RSet for region "HR_FORMAT, |
|
e8b0b0392037
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|
3228 HR_FORMAT_PARAMS(r)); |
|
e8b0b0392037
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|
3229 if (occupied == 0) { |
|
e8b0b0392037
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changeset
|
3230 gclog_or_tty->print_cr(" RSet is empty"); |
|
e8b0b0392037
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|
3231 } else { |
|
e8b0b0392037
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changeset
|
3232 hrrs->print(); |
|
e8b0b0392037
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|
3233 } |
|
e8b0b0392037
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changeset
|
3234 gclog_or_tty->print_cr("----------"); |
|
e8b0b0392037
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diff
changeset
|
3235 return false; |
|
e8b0b0392037
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changeset
|
3236 } |
|
e8b0b0392037
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|
3237 |
|
e8b0b0392037
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|
3238 PrintRSetsClosure(const char* msg) : _msg(msg), _occupied_sum(0) { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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|
3239 gclog_or_tty->cr(); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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changeset
|
3240 gclog_or_tty->print_cr("========================================"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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changeset
|
3241 gclog_or_tty->print_cr(msg); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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changeset
|
3242 gclog_or_tty->cr(); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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changeset
|
3243 } |
|
e8b0b0392037
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|
3244 |
|
e8b0b0392037
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|
3245 ~PrintRSetsClosure() { |
|
e8b0b0392037
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changeset
|
3246 gclog_or_tty->print_cr("Occupied Sum: "SIZE_FORMAT, _occupied_sum); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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changeset
|
3247 gclog_or_tty->print_cr("========================================"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3248 gclog_or_tty->cr(); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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changeset
|
3249 } |
|
e8b0b0392037
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|
3250 }; |
|
e8b0b0392037
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|
3251 |
|
e8b0b0392037
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|
3252 void G1CollectedHeap::print_cset_rsets() { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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changeset
|
3253 PrintRSetsClosure cl("Printing CSet RSets"); |
|
e8b0b0392037
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tonyp
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changeset
|
3254 collection_set_iterate(&cl); |
|
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|
3255 } |
|
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|
3256 |
|
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|
3257 void G1CollectedHeap::print_all_rsets() { |
|
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|
3258 PrintRSetsClosure cl("Printing All RSets");; |
|
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|
3259 heap_region_iterate(&cl); |
|
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|
3260 } |
|
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|
3261 #endif // PRODUCT |
|
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|
3262 |
| 342 | 3263 G1CollectedHeap* G1CollectedHeap::heap() { |
| 3264 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
| 3265 "not a garbage-first heap"); | |
| 3266 return _g1h; | |
| 3267 } | |
| 3268 | |
| 3269 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
|
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|
3270 // always_do_update_barrier = false; |
| 342 | 3271 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
| 3272 // Call allocation profiler | |
| 3273 AllocationProfiler::iterate_since_last_gc(); | |
| 3274 // Fill TLAB's and such | |
| 3275 ensure_parsability(true); | |
| 3276 } | |
| 3277 | |
| 3278 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
| 3279 // FIXME: what is this about? | |
| 3280 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
| 3281 // is set. | |
| 3282 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
| 3283 "derived pointer present")); | |
|
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|
3284 // always_do_update_barrier = true; |
|
3979
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|
3285 |
|
4dfb2df418f2
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|
3286 // We have just completed a GC. Update the soft reference |
|
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|
3287 // policy with the new heap occupancy |
|
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|
3288 Universe::update_heap_info_at_gc(); |
| 342 | 3289 } |
| 3290 | |
| 1973 | 3291 HeapWord* G1CollectedHeap::do_collection_pause(size_t word_size, |
| 3292 unsigned int gc_count_before, | |
| 3293 bool* succeeded) { | |
| 3294 assert_heap_not_locked_and_not_at_safepoint(); | |
| 342 | 3295 g1_policy()->record_stop_world_start(); |
| 1973 | 3296 VM_G1IncCollectionPause op(gc_count_before, |
| 3297 word_size, | |
| 3298 false, /* should_initiate_conc_mark */ | |
| 3299 g1_policy()->max_pause_time_ms(), | |
| 3300 GCCause::_g1_inc_collection_pause); | |
| 3301 VMThread::execute(&op); | |
| 3302 | |
| 3303 HeapWord* result = op.result(); | |
| 3304 bool ret_succeeded = op.prologue_succeeded() && op.pause_succeeded(); | |
| 3305 assert(result == NULL || ret_succeeded, | |
| 3306 "the result should be NULL if the VM did not succeed"); | |
| 3307 *succeeded = ret_succeeded; | |
| 3308 | |
| 3309 assert_heap_not_locked(); | |
| 3310 return result; | |
| 342 | 3311 } |
| 3312 | |
| 3313 void | |
| 3314 G1CollectedHeap::doConcurrentMark() { | |
|
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|
3315 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
|
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|
3316 if (!_cmThread->in_progress()) { |
|
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|
3317 _cmThread->set_started(); |
|
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|
3318 CGC_lock->notify(); |
| 342 | 3319 } |
| 3320 } | |
| 3321 | |
| 3322 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
| 3323 bool young) { | |
| 3324 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
| 3325 } | |
| 3326 | |
| 3327 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
| 3328 predicted_time_ms) { | |
| 3329 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
| 3330 } | |
| 3331 | |
| 3332 size_t G1CollectedHeap::pending_card_num() { | |
| 3333 size_t extra_cards = 0; | |
| 3334 JavaThread *curr = Threads::first(); | |
| 3335 while (curr != NULL) { | |
| 3336 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
| 3337 extra_cards += dcq.size(); | |
| 3338 curr = curr->next(); | |
| 3339 } | |
| 3340 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 3341 size_t buffer_size = dcqs.buffer_size(); | |
| 3342 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 3343 return buffer_size * buffer_num + extra_cards; | |
| 3344 } | |
| 3345 | |
| 3346 size_t G1CollectedHeap::max_pending_card_num() { | |
| 3347 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 3348 size_t buffer_size = dcqs.buffer_size(); | |
| 3349 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 3350 int thread_num = Threads::number_of_threads(); | |
| 3351 return (buffer_num + thread_num) * buffer_size; | |
| 3352 } | |
| 3353 | |
| 3354 size_t G1CollectedHeap::cards_scanned() { | |
| 1861 | 3355 return g1_rem_set()->cardsScanned(); |
| 342 | 3356 } |
| 3357 | |
| 3358 void | |
| 3359 G1CollectedHeap::setup_surviving_young_words() { | |
| 3360 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
|
4090
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|
3361 size_t array_length = g1_policy()->young_cset_region_length(); |
| 342 | 3362 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); |
| 3363 if (_surviving_young_words == NULL) { | |
| 3364 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
| 3365 "Not enough space for young surv words summary."); | |
| 3366 } | |
| 3367 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
|
845
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|
3368 #ifdef ASSERT |
| 342 | 3369 for (size_t i = 0; i < array_length; ++i) { |
|
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|
3370 assert( _surviving_young_words[i] == 0, "memset above" ); |
|
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|
3371 } |
|
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|
3372 #endif // !ASSERT |
| 342 | 3373 } |
| 3374 | |
| 3375 void | |
| 3376 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
| 3377 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
|
4090
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|
3378 size_t array_length = g1_policy()->young_cset_region_length(); |
| 342 | 3379 for (size_t i = 0; i < array_length; ++i) |
| 3380 _surviving_young_words[i] += surv_young_words[i]; | |
| 3381 } | |
| 3382 | |
| 3383 void | |
| 3384 G1CollectedHeap::cleanup_surviving_young_words() { | |
| 3385 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
| 3386 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
| 3387 _surviving_young_words = NULL; | |
| 3388 } | |
| 3389 | |
|
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|
3390 #ifdef ASSERT |
|
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|
3391 class VerifyCSetClosure: public HeapRegionClosure { |
|
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|
3392 public: |
|
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changeset
|
3393 bool doHeapRegion(HeapRegion* hr) { |
|
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diff
changeset
|
3394 // Here we check that the CSet region's RSet is ready for parallel |
|
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diff
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|
3395 // iteration. The fields that we'll verify are only manipulated |
|
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diff
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|
3396 // when the region is part of a CSet and is collected. Afterwards, |
|
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diff
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|
3397 // we reset these fields when we clear the region's RSet (when the |
|
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diff
changeset
|
3398 // region is freed) so they are ready when the region is |
|
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diff
changeset
|
3399 // re-allocated. The only exception to this is if there's an |
|
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|
3400 // evacuation failure and instead of freeing the region we leave |
|
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diff
changeset
|
3401 // it in the heap. In that case, we reset these fields during |
|
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diff
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|
3402 // evacuation failure handling. |
|
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diff
changeset
|
3403 guarantee(hr->rem_set()->verify_ready_for_par_iteration(), "verification"); |
|
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tonyp
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|
3404 |
|
e8b0b0392037
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diff
changeset
|
3405 // Here's a good place to add any other checks we'd like to |
|
e8b0b0392037
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diff
changeset
|
3406 // perform on CSet regions. |
|
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3407 return false; |
|
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
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1245
diff
changeset
|
3408 } |
|
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3409 }; |
|
3777
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7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3410 #endif // ASSERT |
|
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
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diff
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|
3411 |
| 1709 | 3412 #if TASKQUEUE_STATS |
| 3413 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
| 3414 st->print_raw_cr("GC Task Stats"); | |
| 3415 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
| 3416 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
| 3417 } | |
| 3418 | |
| 3419 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
| 3420 print_taskqueue_stats_hdr(st); | |
| 3421 | |
| 3422 TaskQueueStats totals; | |
|
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3423 const int n = workers() != NULL ? workers()->total_workers() : 1; |
| 1709 | 3424 for (int i = 0; i < n; ++i) { |
| 3425 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
| 3426 totals += task_queue(i)->stats; | |
| 3427 } | |
| 3428 st->print_raw("tot "); totals.print(st); st->cr(); | |
| 3429 | |
| 3430 DEBUG_ONLY(totals.verify()); | |
| 3431 } | |
| 3432 | |
| 3433 void G1CollectedHeap::reset_taskqueue_stats() { | |
|
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3434 const int n = workers() != NULL ? workers()->total_workers() : 1; |
| 1709 | 3435 for (int i = 0; i < n; ++i) { |
| 3436 task_queue(i)->stats.reset(); | |
| 3437 } | |
| 3438 } | |
| 3439 #endif // TASKQUEUE_STATS | |
| 3440 | |
| 1973 | 3441 bool |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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parents:
1611
diff
changeset
|
3442 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
| 2152 | 3443 assert_at_safepoint(true /* should_be_vm_thread */); |
| 3444 guarantee(!is_gc_active(), "collection is not reentrant"); | |
| 3445 | |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1313
diff
changeset
|
3446 if (GC_locker::check_active_before_gc()) { |
| 1973 | 3447 return false; |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1313
diff
changeset
|
3448 } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1313
diff
changeset
|
3449 |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2039
diff
changeset
|
3450 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
|
2039
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
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2038
diff
changeset
|
3451 ResourceMark rm; |
|
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
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2038
diff
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|
3452 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3453 if (PrintHeapAtGC) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3454 Universe::print_heap_before_gc(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3455 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3456 |
| 4072 | 3457 HRSPhaseSetter x(HRSPhaseEvacuation); |
| 2152 | 3458 verify_region_sets_optional(); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
changeset
|
3459 verify_dirty_young_regions(); |
| 2152 | 3460 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3461 { |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1313
diff
changeset
|
3462 // 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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1313
diff
changeset
|
3463 // 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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diff
changeset
|
3464 // for the duration of this pause. |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1313
diff
changeset
|
3465 g1_policy()->decide_on_conc_mark_initiation(); |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3466 |
|
3982
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
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3980
diff
changeset
|
3467 // 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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3980
diff
changeset
|
3468 // 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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3980
diff
changeset
|
3469 assert(!g1_policy()->during_initial_mark_pause() || |
|
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
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3980
diff
changeset
|
3470 g1_policy()->full_young_gcs(), "sanity"); |
|
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
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3980
diff
changeset
|
3471 |
|
273b46400613
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3980
diff
changeset
|
3472 // We also do not allow partially-young GCs during marking. |
|
273b46400613
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3980
diff
changeset
|
3473 assert(!mark_in_progress() || g1_policy()->full_young_gcs(), "sanity"); |
|
273b46400613
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3980
diff
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|
3474 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3475 char verbose_str[128]; |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3476 sprintf(verbose_str, "GC pause "); |
|
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3477 if (g1_policy()->full_young_gcs()) { |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
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3830
diff
changeset
|
3478 strcat(verbose_str, "(young)"); |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3479 } else { |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3480 strcat(verbose_str, "(partial)"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3481 } |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3482 if (g1_policy()->during_initial_mark_pause()) { |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3483 strcat(verbose_str, " (initial-mark)"); |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3484 // 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
|
3485 // full collection counter. |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3486 increment_total_full_collections(); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3487 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3488 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3489 // 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
|
3490 // 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
|
3491 // is messy if we do. |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3492 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3493 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3494 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
|
3495 |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3496 TraceCollectorStats tcs(g1mm()->incremental_collection_counters()); |
|
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
3497 TraceMemoryManagerStats tms(false /* fullGC */, gc_cause()); |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3498 |
| 2361 | 3499 // If the secondary_free_list is not empty, append it to the |
| 3500 // free_list. No need to wait for the cleanup operation to finish; | |
| 3501 // the region allocation code will check the secondary_free_list | |
| 3502 // and wait if necessary. If the G1StressConcRegionFreeing flag is | |
| 3503 // set, skip this step so that the region allocation code has to | |
| 3504 // get entries from the secondary_free_list. | |
| 2152 | 3505 if (!G1StressConcRegionFreeing) { |
| 2361 | 3506 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 3507 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3508 |
|
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3509 assert(check_young_list_well_formed(), |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3510 "young list should be well formed"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3511 |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3512 // Don't dynamically change the number of GC threads this early. A value of |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3513 // 0 is used to indicate serial work. When parallel work is done, |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3514 // it will be set. |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3515 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3516 { // 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
|
3517 IsGCActiveMark x; |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3518 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3519 gc_prologue(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3520 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
|
3521 increment_gc_time_stamp(); |
| 342 | 3522 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3523 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3524 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
|
3525 gclog_or_tty->print(" VerifyBeforeGC:"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3526 prepare_for_verify(); |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3527 Universe::verify(/* allow dirty */ false, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3528 /* silent */ false, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3529 /* option */ VerifyOption_G1UsePrevMarking); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3530 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3531 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3532 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3533 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3534 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3535 // Please see comment in g1CollectedHeap.hpp and |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3536 // G1CollectedHeap::ref_processing_init() to see how |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3537 // reference processing currently works in G1. |
|
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 // Enable discovery in the STW reference processor |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3540 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3541 true /*verify_no_refs*/); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3542 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3543 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3544 // We want to temporarily turn off discovery by the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3545 // CM ref processor, if necessary, and turn it back on |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3546 // on again later if we do. Using a scoped |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3547 // NoRefDiscovery object will do this. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3548 NoRefDiscovery no_cm_discovery(ref_processor_cm()); |
|
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 // 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
|
3551 // of the collection set!). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3552 release_mutator_alloc_region(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3553 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3554 // We should call this after we retire the mutator alloc |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3555 // region(s) so that all the ALLOC / RETIRE events are generated |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3556 // before the start GC event. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3557 _hr_printer.start_gc(false /* full */, (size_t) total_collections()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3558 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3559 // The elapsed time induced by the start time below deliberately elides |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3560 // the possible verification above. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3561 double start_time_sec = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3562 size_t start_used_bytes = used(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3563 |
|
1394
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("\nBefore recording pause start.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3566 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3567 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
|
3568 #endif // YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3569 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3570 g1_policy()->record_collection_pause_start(start_time_sec, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3571 start_used_bytes); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3572 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3573 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3574 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3575 _young_list->print(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3576 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3577 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3578 if (g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3579 concurrent_mark()->checkpointRootsInitialPre(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3580 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3581 perm_gen()->save_marks(); |
|
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 // We must do this before any possible evacuation that should propagate |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3584 // marks. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3585 if (mark_in_progress()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3586 double start_time_sec = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3587 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3588 _cm->drainAllSATBBuffers(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3589 double finish_mark_ms = (os::elapsedTime() - start_time_sec) * 1000.0; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3590 g1_policy()->record_satb_drain_time(finish_mark_ms); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3591 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3592 // 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
|
3593 // only iterate over these. (Since evacuation may add to the mark |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3594 // stack, doing more exposes race conditions.) If no mark is in |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3595 // progress, this will be zero. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3596 _cm->set_oops_do_bound(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3597 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3598 if (mark_in_progress()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3599 concurrent_mark()->newCSet(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3600 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3601 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3602 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3603 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3604 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3605 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
|
3606 #endif // YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3607 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3608 g1_policy()->choose_collection_set(target_pause_time_ms); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3609 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3610 if (_hr_printer.is_active()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3611 HeapRegion* hr = g1_policy()->collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3612 while (hr != NULL) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3613 G1HRPrinter::RegionType type; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3614 if (!hr->is_young()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3615 type = G1HRPrinter::Old; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3616 } else if (hr->is_survivor()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3617 type = G1HRPrinter::Survivor; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3618 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3619 type = G1HRPrinter::Eden; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3620 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3621 _hr_printer.cset(hr); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3622 hr = hr->next_in_collection_set(); |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3623 } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3624 } |
|
3979
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 // We have chosen the complete collection set. If marking is |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3627 // active then, we clear the region fields of any of the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3628 // concurrent marking tasks whose region fields point into |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3629 // the collection set as these values will become stale. This |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3630 // will cause the owning marking threads to claim a new region |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3631 // when marking restarts. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3632 if (mark_in_progress()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3633 concurrent_mark()->reset_active_task_region_fields_in_cset(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3634 } |
|
3378
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3635 |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3636 #ifdef ASSERT |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3637 VerifyCSetClosure cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3638 collection_set_iterate(&cl); |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3639 #endif // ASSERT |
| 1707 | 3640 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3641 setup_surviving_young_words(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3642 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3643 // Initialize the GC alloc regions. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3644 init_gc_alloc_regions(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3645 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3646 // Actually do the work... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3647 evacuate_collection_set(); |
|
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 free_collection_set(g1_policy()->collection_set()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3650 g1_policy()->clear_collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3651 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3652 cleanup_surviving_young_words(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3653 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3654 // Start a new incremental collection set for the next pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3655 g1_policy()->start_incremental_cset_building(); |
|
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 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3658 // regions to the incremental collection set for the next |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3659 // evacuation pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3660 clear_cset_fast_test(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3661 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3662 _young_list->reset_sampled_info(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3663 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3664 // Don't check the whole heap at this point as the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3665 // GC alloc regions from this pause have been tagged |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3666 // as survivors and moved on to the survivor list. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3667 // Survivor regions will fail the !is_young() check. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3668 assert(check_young_list_empty(false /* check_heap */), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3669 "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
|
3670 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3671 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3672 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3673 _young_list->print(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3674 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3675 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3676 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3677 _young_list->first_survivor_region(), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3678 _young_list->last_survivor_region()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3679 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3680 _young_list->reset_auxilary_lists(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3681 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3682 if (evacuation_failed()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3683 _summary_bytes_used = recalculate_used(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3684 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3685 // The "used" of the the collection set have already been subtracted |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3686 // when they were freed. Add in the bytes evacuated. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3687 _summary_bytes_used += g1_policy()->bytes_copied_during_gc(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3688 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3689 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3690 if (g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3691 concurrent_mark()->checkpointRootsInitialPost(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3692 set_marking_started(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3693 // CAUTION: after the doConcurrentMark() call below, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3694 // the concurrent marking thread(s) could be running |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3695 // concurrently with us. Make sure that anything after |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3696 // 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
|
3697 // running. Note: of course, the actual marking work will |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3698 // not start until the safepoint itself is released in |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3699 // ConcurrentGCThread::safepoint_desynchronize(). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3700 doConcurrentMark(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3701 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3702 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3703 allocate_dummy_regions(); |
|
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
3704 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3705 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3706 gclog_or_tty->print_cr("\nEnd of the pause.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3707 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3708 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
|
3709 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3710 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3711 init_mutator_alloc_region(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3712 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3713 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3714 size_t expand_bytes = g1_policy()->expansion_amount(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3715 if (expand_bytes > 0) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3716 size_t bytes_before = capacity(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3717 if (!expand(expand_bytes)) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3718 // We failed to expand the heap so let's verify that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3719 // committed/uncommitted amount match the backing store |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3720 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3721 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3722 } |
|
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3723 } |
|
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3724 } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3725 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3726 double end_time_sec = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3727 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3728 g1_policy()->record_pause_time_ms(pause_time_ms); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3729 int active_gc_threads = workers()->active_workers(); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3730 g1_policy()->record_collection_pause_end(active_gc_threads); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3731 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3732 MemoryService::track_memory_usage(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3733 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3734 // 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
|
3735 // update buffers to bring the RSets up-to-date if |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3736 // G1HRRSFlushLogBuffersOnVerify has been set. While scanning |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3737 // 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
|
3738 // regions we just allocated to (i.e., the GC alloc |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3739 // regions). However, during the last GC we called |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3740 // set_saved_mark() on all the GC alloc regions, so card |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3741 // scanning might skip the [saved_mark_word()...top()] area of |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3742 // those regions (i.e., the area we allocated objects into |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3743 // during the last GC). But it shouldn't. Given that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3744 // saved_mark_word() is conditional on whether the GC time stamp |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3745 // 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
|
3746 // 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
|
3747 // regions and saved_mark_word() will simply return top() for |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3748 // 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
|
3749 // than iterating over the regions and fixing them. In fact, the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3750 // GC time stamp increment here also ensures that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3751 // saved_mark_word() will return top() between pauses, i.e., |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3752 // during concurrent refinement. So we don't need the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3753 // is_gc_active() check to decided which top to use when |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3754 // scanning cards (see CR 7039627). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3755 increment_gc_time_stamp(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3756 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3757 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3758 HandleMark hm; // Discard invalid handles created during verification |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3759 gclog_or_tty->print(" VerifyAfterGC:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3760 prepare_for_verify(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3761 Universe::verify(/* allow dirty */ true, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3762 /* silent */ false, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3763 /* option */ VerifyOption_G1UsePrevMarking); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3764 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3765 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3766 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3767 ref_processor_stw()->verify_no_references_recorded(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3768 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3769 // 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
|
3770 } |
|
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3771 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3772 { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3773 size_t expand_bytes = g1_policy()->expansion_amount(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3774 if (expand_bytes > 0) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3775 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
|
3776 // 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
|
3777 // 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
|
3778 if (!expand(expand_bytes)) { |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3779 // 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
|
3780 // committed/uncommitted amount match the backing store |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3781 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3782 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
|
3783 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3784 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3785 } |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3786 |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3787 // 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
|
3788 // 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
|
3789 // 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
|
3790 // RETIRE events are generated before the end GC event. |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3791 _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
|
3792 |
|
3764
053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
tonyp
parents:
3378
diff
changeset
|
3793 // 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
|
3794 g1_policy()->print_heap_transition(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3795 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3796 if (mark_in_progress()) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3797 concurrent_mark()->update_g1_committed(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3798 } |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3799 |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3800 #ifdef TRACESPINNING |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3801 ParallelTaskTerminator::print_termination_counts(); |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3802 #endif |
| 342 | 3803 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3804 gc_epilogue(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3805 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3806 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3807 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3808 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
|
3809 print_tracing_info(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3810 vm_exit(-1); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3811 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3812 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3813 |
| 3766 | 3814 _hrs.verify_optional(); |
| 2152 | 3815 verify_region_sets_optional(); |
| 3816 | |
| 1709 | 3817 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
| 3818 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); | |
| 3819 | |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3820 if (PrintHeapAtGC) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3821 Universe::print_heap_after_gc(); |
| 342 | 3822 } |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
3823 g1mm()->update_sizes(); |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3824 |
|
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3825 if (G1SummarizeRSetStats && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3826 (G1SummarizeRSetStatsPeriod > 0) && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3827 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3828 g1_rem_set()->print_summary_info(); |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3829 } |
| 1973 | 3830 |
| 3831 return true; | |
| 342 | 3832 } |
| 3833 | |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3834 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3835 { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3836 size_t gclab_word_size; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3837 switch (purpose) { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3838 case GCAllocForSurvived: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3839 gclab_word_size = YoungPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3840 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3841 case GCAllocForTenured: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3842 gclab_word_size = OldPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3843 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3844 default: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3845 assert(false, "unknown GCAllocPurpose"); |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3846 gclab_word_size = OldPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3847 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3848 } |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3849 return gclab_word_size; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3850 } |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3851 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3852 void G1CollectedHeap::init_mutator_alloc_region() { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3853 assert(_mutator_alloc_region.get() == NULL, "pre-condition"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3854 _mutator_alloc_region.init(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3855 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3856 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3857 void G1CollectedHeap::release_mutator_alloc_region() { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3858 _mutator_alloc_region.release(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
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|
3859 assert(_mutator_alloc_region.get() == NULL, "post-condition"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3860 } |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3861 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
changeset
|
3862 void G1CollectedHeap::init_gc_alloc_regions() { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
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|
3863 assert_at_safepoint(true /* should_be_vm_thread */); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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|
3864 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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changeset
|
3865 _survivor_gc_alloc_region.init(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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changeset
|
3866 _old_gc_alloc_region.init(); |
|
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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changeset
|
3867 HeapRegion* retained_region = _retained_old_gc_alloc_region; |
|
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
3868 _retained_old_gc_alloc_region = NULL; |
|
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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changeset
|
3869 |
|
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parents:
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changeset
|
3870 // We will discard the current GC alloc region if: |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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|
3871 // a) it's in the collection set (it can happen!), |
|
f44782f04dd4
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parents:
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diff
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|
3872 // b) it's already full (no point in using it), |
|
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|
3873 // c) it's empty (this means that it was emptied during |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
3874 // a cleanup and it should be on the free list now), or |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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changeset
|
3875 // d) it's humongous (this means that it was emptied |
|
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
3876 // during a cleanup and was added to the free list, but |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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changeset
|
3877 // has been subseqently used to allocate a humongous |
|
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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changeset
|
3878 // object that may be less than the region size). |
|
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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changeset
|
3879 if (retained_region != NULL && |
|
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changeset
|
3880 !retained_region->in_collection_set() && |
|
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changeset
|
3881 !(retained_region->top() == retained_region->end()) && |
|
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changeset
|
3882 !retained_region->is_empty() && |
|
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|
3883 !retained_region->isHumongous()) { |
|
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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changeset
|
3884 retained_region->set_saved_mark(); |
| 4072 | 3885 // The retained region was added to the old region set when it was |
| 3886 // retired. We have to remove it now, since we don't allow regions | |
| 3887 // we allocate to in the region sets. We'll re-add it later, when | |
| 3888 // it's retired again. | |
| 3889 _old_set.remove(retained_region); | |
|
3830
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|
3890 _old_gc_alloc_region.set(retained_region); |
|
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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changeset
|
3891 _hr_printer.reuse(retained_region); |
| 342 | 3892 } |
| 3893 } | |
| 3894 | |
|
3830
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|
3895 void G1CollectedHeap::release_gc_alloc_regions() { |
|
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changeset
|
3896 _survivor_gc_alloc_region.release(); |
|
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changeset
|
3897 // If we have an old GC alloc region to release, we'll save it in |
|
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changeset
|
3898 // _retained_old_gc_alloc_region. If we don't |
|
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|
3899 // _retained_old_gc_alloc_region will become NULL. This is what we |
|
f44782f04dd4
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changeset
|
3900 // want either way so no reason to check explicitly for either |
|
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parents:
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changeset
|
3901 // condition. |
|
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changeset
|
3902 _retained_old_gc_alloc_region = _old_gc_alloc_region.release(); |
| 342 | 3903 } |
| 3904 | |
|
3830
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|
3905 void G1CollectedHeap::abandon_gc_alloc_regions() { |
|
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changeset
|
3906 assert(_survivor_gc_alloc_region.get() == NULL, "pre-condition"); |
|
f44782f04dd4
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changeset
|
3907 assert(_old_gc_alloc_region.get() == NULL, "pre-condition"); |
|
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changeset
|
3908 _retained_old_gc_alloc_region = NULL; |
| 342 | 3909 } |
| 3910 | |
| 3911 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
| 3912 _drain_in_progress = false; | |
| 3913 set_evac_failure_closure(cl); | |
| 3914 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 3915 } | |
| 3916 | |
| 3917 void G1CollectedHeap::finalize_for_evac_failure() { | |
| 3918 assert(_evac_failure_scan_stack != NULL && | |
| 3919 _evac_failure_scan_stack->length() == 0, | |
| 3920 "Postcondition"); | |
| 3921 assert(!_drain_in_progress, "Postcondition"); | |
| 1045 | 3922 delete _evac_failure_scan_stack; |
| 342 | 3923 _evac_failure_scan_stack = NULL; |
| 3924 } | |
| 3925 | |
|
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
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diff
changeset
|
3926 class UpdateRSetDeferred : public OopsInHeapRegionClosure { |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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parents:
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diff
changeset
|
3927 private: |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
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diff
changeset
|
3928 G1CollectedHeap* _g1; |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3929 DirtyCardQueue *_dcq; |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3930 CardTableModRefBS* _ct_bs; |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3931 |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3932 public: |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3933 UpdateRSetDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3934 _g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) {} |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3935 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3936 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3937 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3938 template <class T> void do_oop_work(T* p) { |
|
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3939 assert(_from->is_in_reserved(p), "paranoia"); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3940 if (!_from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3941 !_from->is_survivor()) { |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3942 size_t card_index = _ct_bs->index_for(p); |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3943 if (_ct_bs->mark_card_deferred(card_index)) { |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3944 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3945 } |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3946 } |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3947 } |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3948 }; |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3949 |
| 342 | 3950 class RemoveSelfPointerClosure: public ObjectClosure { |
| 3951 private: | |
| 3952 G1CollectedHeap* _g1; | |
| 3953 ConcurrentMark* _cm; | |
| 3954 HeapRegion* _hr; | |
| 3955 size_t _prev_marked_bytes; | |
| 3956 size_t _next_marked_bytes; | |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3957 OopsInHeapRegionClosure *_cl; |
| 342 | 3958 public: |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3959 RemoveSelfPointerClosure(G1CollectedHeap* g1, HeapRegion* hr, |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3960 OopsInHeapRegionClosure* cl) : |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3961 _g1(g1), _hr(hr), _cm(_g1->concurrent_mark()), _prev_marked_bytes(0), |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3962 _next_marked_bytes(0), _cl(cl) {} |
| 342 | 3963 |
| 3964 size_t prev_marked_bytes() { return _prev_marked_bytes; } | |
| 3965 size_t next_marked_bytes() { return _next_marked_bytes; } | |
| 3966 | |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3967 // <original comment> |
|
352
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3968 // The original idea here was to coalesce evacuated and dead objects. |
|
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3969 // However that caused complications with the block offset table (BOT). |
|
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3970 // In particular if there were two TLABs, one of them partially refined. |
|
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3971 // |----- TLAB_1--------|----TLAB_2-~~~(partially refined part)~~~| |
|
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3972 // The BOT entries of the unrefined part of TLAB_2 point to the start |
|
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3973 // of TLAB_2. If the last object of the TLAB_1 and the first object |
|
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3974 // of TLAB_2 are coalesced, then the cards of the unrefined part |
|
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3975 // would point into middle of the filler object. |
|
2133
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7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3976 // The current approach is to not coalesce and leave the BOT contents intact. |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3977 // </original comment> |
|
352
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
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342
diff
changeset
|
3978 // |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
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2039
diff
changeset
|
3979 // We now reset the BOT when we start the object iteration over the |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3980 // region and refine its entries for every object we come across. So |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3981 // the above comment is not really relevant and we should be able |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3982 // to coalesce dead objects if we want to. |
|
352
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3983 void do_object(oop obj) { |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3984 HeapWord* obj_addr = (HeapWord*) obj; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3985 assert(_hr->is_in(obj_addr), "sanity"); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3986 size_t obj_size = obj->size(); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3987 _hr->update_bot_for_object(obj_addr, obj_size); |
|
352
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3988 if (obj->is_forwarded() && obj->forwardee() == obj) { |
|
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3989 // The object failed to move. |
|
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3990 assert(!_g1->is_obj_dead(obj), "We should not be preserving dead objs."); |
|
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3991 _cm->markPrev(obj); |
|
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3992 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
|
2133
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7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3993 _prev_marked_bytes += (obj_size * HeapWordSize); |
|
352
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3994 if (_g1->mark_in_progress() && !_g1->is_obj_ill(obj)) { |
|
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3995 _cm->markAndGrayObjectIfNecessary(obj); |
|
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3996 } |
|
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3997 obj->set_mark(markOopDesc::prototype()); |
|
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3998 // While we were processing RSet buffers during the |
|
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3999 // collection, we actually didn't scan any cards on the |
|
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4000 // collection set, since we didn't want to update remebered |
|
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4001 // sets with entries that point into the collection set, given |
|
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4002 // that live objects fromthe collection set are about to move |
|
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4003 // and such entries will be stale very soon. This change also |
|
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4004 // dealt with a reliability issue which involved scanning a |
|
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4005 // card in the collection set and coming across an array that |
|
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|
4006 // was being chunked and looking malformed. The problem is |
|
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|
4007 // that, if evacuation fails, we might have remembered set |
|
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4008 // entries missing given that we skipped cards on the |
|
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4009 // collection set. So, we'll recreate such entries now. |
|
616
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|
4010 obj->oop_iterate(_cl); |
|
352
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4011 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
|
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|
4012 } else { |
|
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|
4013 // The object has been either evacuated or is dead. Fill it with a |
|
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|
4014 // dummy object. |
|
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|
4015 MemRegion mr((HeapWord*)obj, obj_size); |
|
481
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|
4016 CollectedHeap::fill_with_object(mr); |
| 342 | 4017 _cm->clearRangeBothMaps(mr); |
| 4018 } | |
| 4019 } | |
| 4020 }; | |
| 4021 | |
| 4022 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
| 1705 | 4023 UpdateRSetImmediate immediate_update(_g1h->g1_rem_set()); |
|
616
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|
4024 DirtyCardQueue dcq(&_g1h->dirty_card_queue_set()); |
|
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4025 UpdateRSetDeferred deferred_update(_g1h, &dcq); |
|
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|
4026 OopsInHeapRegionClosure *cl; |
|
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4027 if (G1DeferredRSUpdate) { |
|
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|
4028 cl = &deferred_update; |
|
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|
4029 } else { |
|
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|
4030 cl = &immediate_update; |
|
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|
4031 } |
| 342 | 4032 HeapRegion* cur = g1_policy()->collection_set(); |
| 4033 while (cur != NULL) { | |
| 4034 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
|
2133
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|
4035 assert(!cur->isHumongous(), "sanity"); |
|
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|
4036 |
| 342 | 4037 if (cur->evacuation_failed()) { |
| 4038 assert(cur->in_collection_set(), "bad CS"); | |
|
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|
4039 RemoveSelfPointerClosure rspc(_g1h, cur, cl); |
|
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|
4040 |
|
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|
4041 // In the common case we make sure that this is done when the |
|
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|
4042 // region is freed so that it is "ready-to-go" when it's |
|
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|
4043 // re-allocated. However, when evacuation failure happens, a |
|
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|
4044 // region will remain in the heap and might ultimately be added |
|
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|
4045 // to a CSet in the future. So we have to be careful here and |
|
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|
4046 // make sure the region's RSet is ready for parallel iteration |
|
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|
4047 // whenever this might be required in the future. |
|
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|
4048 cur->rem_set()->reset_for_par_iteration(); |
|
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|
4049 cur->reset_bot(); |
|
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|
4050 cl->set_region(cur); |
| 342 | 4051 cur->object_iterate(&rspc); |
| 4052 | |
| 4053 // A number of manipulations to make the TAMS be the current top, | |
| 4054 // and the marked bytes be the ones observed in the iteration. | |
| 4055 if (_g1h->concurrent_mark()->at_least_one_mark_complete()) { | |
| 4056 // The comments below are the postconditions achieved by the | |
| 4057 // calls. Note especially the last such condition, which says that | |
| 4058 // the count of marked bytes has been properly restored. | |
| 4059 cur->note_start_of_marking(false); | |
| 4060 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
| 4061 cur->add_to_marked_bytes(rspc.prev_marked_bytes()); | |
| 4062 // _next_marked_bytes == prev_marked_bytes. | |
| 4063 cur->note_end_of_marking(); | |
| 4064 // _prev_top_at_mark_start == top(), | |
| 4065 // _prev_marked_bytes == prev_marked_bytes | |
| 4066 } | |
| 4067 // If there is no mark in progress, we modified the _next variables | |
| 4068 // above needlessly, but harmlessly. | |
| 4069 if (_g1h->mark_in_progress()) { | |
| 4070 cur->note_start_of_marking(false); | |
| 4071 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
| 4072 // _next_marked_bytes == next_marked_bytes. | |
| 4073 } | |
| 4074 } | |
| 4075 cur = cur->next_in_collection_set(); | |
| 4076 } | |
| 4077 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
| 4078 | |
| 4079 // Now restore saved marks, if any. | |
| 4080 if (_objs_with_preserved_marks != NULL) { | |
| 4081 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
| 4082 guarantee(_objs_with_preserved_marks->length() == | |
| 4083 _preserved_marks_of_objs->length(), "Both or none."); | |
| 4084 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
| 4085 oop obj = _objs_with_preserved_marks->at(i); | |
| 4086 markOop m = _preserved_marks_of_objs->at(i); | |
| 4087 obj->set_mark(m); | |
| 4088 } | |
| 4089 // Delete the preserved marks growable arrays (allocated on the C heap). | |
| 4090 delete _objs_with_preserved_marks; | |
| 4091 delete _preserved_marks_of_objs; | |
| 4092 _objs_with_preserved_marks = NULL; | |
| 4093 _preserved_marks_of_objs = NULL; | |
| 4094 } | |
| 4095 } | |
| 4096 | |
| 4097 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
| 4098 _evac_failure_scan_stack->push(obj); | |
| 4099 } | |
| 4100 | |
| 4101 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
| 4102 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
| 4103 | |
| 4104 while (_evac_failure_scan_stack->length() > 0) { | |
| 4105 oop obj = _evac_failure_scan_stack->pop(); | |
| 4106 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
| 4107 obj->oop_iterate_backwards(_evac_failure_closure); | |
| 4108 } | |
| 4109 } | |
| 4110 | |
| 4111 oop | |
| 4112 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
|
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|
4113 oop old, |
|
663cb89032b1
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|
4114 bool should_mark_root) { |
|
3323
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|
4115 assert(obj_in_cs(old), |
|
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|
4116 err_msg("obj: "PTR_FORMAT" should still be in the CSet", |
|
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|
4117 (HeapWord*) old)); |
| 342 | 4118 markOop m = old->mark(); |
| 4119 oop forward_ptr = old->forward_to_atomic(old); | |
| 4120 if (forward_ptr == NULL) { | |
| 4121 // Forward-to-self succeeded. | |
|
3973
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|
4122 |
|
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|
4123 // should_mark_root will be true when this routine is called |
|
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|
4124 // from a root scanning closure during an initial mark pause. |
|
663cb89032b1
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|
4125 // In this case the thread that succeeds in self-forwarding the |
|
663cb89032b1
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|
4126 // object is also responsible for marking the object. |
|
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|
4127 if (should_mark_root) { |
|
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|
4128 assert(!oopDesc::is_null(old), "shouldn't be"); |
|
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|
4129 _cm->grayRoot(old); |
|
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|
4130 } |
|
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|
4131 |
| 342 | 4132 if (_evac_failure_closure != cl) { |
| 4133 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
| 4134 assert(!_drain_in_progress, | |
| 4135 "Should only be true while someone holds the lock."); | |
| 4136 // Set the global evac-failure closure to the current thread's. | |
| 4137 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
| 4138 set_evac_failure_closure(cl); | |
| 4139 // Now do the common part. | |
| 4140 handle_evacuation_failure_common(old, m); | |
| 4141 // Reset to NULL. | |
| 4142 set_evac_failure_closure(NULL); | |
| 4143 } else { | |
| 4144 // The lock is already held, and this is recursive. | |
| 4145 assert(_drain_in_progress, "This should only be the recursive case."); | |
| 4146 handle_evacuation_failure_common(old, m); | |
| 4147 } | |
| 4148 return old; | |
| 4149 } else { | |
|
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|
4150 // Forward-to-self failed. Either someone else managed to allocate |
|
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|
4151 // space for this object (old != forward_ptr) or they beat us in |
|
75af3e8de182
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|
4152 // self-forwarding it (old == forward_ptr). |
|
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|
4153 assert(old == forward_ptr || !obj_in_cs(forward_ptr), |
|
75af3e8de182
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|
4154 err_msg("obj: "PTR_FORMAT" forwarded to: "PTR_FORMAT" " |
|
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|
4155 "should not be in the CSet", |
|
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|
4156 (HeapWord*) old, (HeapWord*) forward_ptr)); |
| 342 | 4157 return forward_ptr; |
| 4158 } | |
| 4159 } | |
| 4160 | |
| 4161 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
| 4162 set_evacuation_failed(true); | |
| 4163 | |
| 4164 preserve_mark_if_necessary(old, m); | |
| 4165 | |
| 4166 HeapRegion* r = heap_region_containing(old); | |
| 4167 if (!r->evacuation_failed()) { | |
| 4168 r->set_evacuation_failed(true); | |
|
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|
4169 _hr_printer.evac_failure(r); |
| 342 | 4170 } |
| 4171 | |
| 4172 push_on_evac_failure_scan_stack(old); | |
| 4173 | |
| 4174 if (!_drain_in_progress) { | |
| 4175 // prevent recursion in copy_to_survivor_space() | |
| 4176 _drain_in_progress = true; | |
| 4177 drain_evac_failure_scan_stack(); | |
| 4178 _drain_in_progress = false; | |
| 4179 } | |
| 4180 } | |
| 4181 | |
| 4182 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
|
2038
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|
4183 assert(evacuation_failed(), "Oversaving!"); |
|
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|
4184 // We want to call the "for_promotion_failure" version only in the |
|
74ee0db180fa
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|
4185 // case of a promotion failure. |
|
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|
4186 if (m->must_be_preserved_for_promotion_failure(obj)) { |
| 342 | 4187 if (_objs_with_preserved_marks == NULL) { |
| 4188 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
| 4189 _objs_with_preserved_marks = | |
| 4190 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 4191 _preserved_marks_of_objs = | |
| 4192 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
| 4193 } | |
| 4194 _objs_with_preserved_marks->push(obj); | |
| 4195 _preserved_marks_of_objs->push(m); | |
| 4196 } | |
| 4197 } | |
| 4198 | |
| 4199 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
| 4200 size_t word_size) { | |
|
3830
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diff
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|
4201 if (purpose == GCAllocForSurvived) { |
|
f44782f04dd4
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diff
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|
4202 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
|
4203 if (result != NULL) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4204 return result; |
| 342 | 4205 } else { |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4206 // 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
|
4207 // object there. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4208 return old_attempt_allocation(word_size); |
| 342 | 4209 } |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4210 } else { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4211 assert(purpose == GCAllocForTenured, "sanity"); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4212 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
|
4213 if (result != NULL) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4214 return result; |
| 342 | 4215 } else { |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4216 // 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
|
4217 // object there. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4218 return survivor_attempt_allocation(word_size); |
| 342 | 4219 } |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4220 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4221 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4222 ShouldNotReachHere(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4223 // 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
|
4224 return NULL; |
| 342 | 4225 } |
| 4226 | |
| 4227 #ifndef PRODUCT | |
| 4228 bool GCLabBitMapClosure::do_bit(size_t offset) { | |
| 4229 HeapWord* addr = _bitmap->offsetToHeapWord(offset); | |
| 4230 guarantee(_cm->isMarked(oop(addr)), "it should be!"); | |
| 4231 return true; | |
| 4232 } | |
| 4233 #endif // PRODUCT | |
| 4234 | |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4235 G1ParGCAllocBuffer::G1ParGCAllocBuffer(size_t gclab_word_size) : |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4236 ParGCAllocBuffer(gclab_word_size), |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4237 _should_mark_objects(false), |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4238 _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
|
4239 _retired(false) |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4240 { |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4241 //_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
|
4242 // mark the forwarded location of an evacuated object. |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4243 // 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
|
4244 // 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
|
4245 // 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
|
4246 if (G1CollectedHeap::heap()->mark_in_progress() || |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4247 G1CollectedHeap::heap()->g1_policy()->during_initial_mark_pause()) { |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4248 _should_mark_objects = true; |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4249 } |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4250 } |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4251 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4252 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4253 : _g1h(g1h), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4254 _refs(g1h->task_queue(queue_num)), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4255 _dcq(&g1h->dirty_card_queue_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4256 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4257 _g1_rem(g1h->g1_rem_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4258 _hash_seed(17), _queue_num(queue_num), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4259 _term_attempts(0), |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4260 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4261 _tenured_alloc_buffer(g1h->desired_plab_sz(GCAllocForTenured)), |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4262 _age_table(false), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4263 _strong_roots_time(0), _term_time(0), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4264 _alloc_buffer_waste(0), _undo_waste(0) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4265 { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4266 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4267 // 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
|
4268 // non-young regions (where the age is -1) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4269 // 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
|
4270 // an attempt to eliminate cache contention |
|
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4073
diff
changeset
|
4271 size_t real_length = 1 + _g1h->g1_policy()->young_cset_region_length(); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4272 size_t array_length = PADDING_ELEM_NUM + |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4273 real_length + |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4274 PADDING_ELEM_NUM; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4275 _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
|
4276 if (_surviving_young_words_base == NULL) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4277 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
|
4278 "Not enough space for young surv histo."); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4279 _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
|
4280 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
|
4281 |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4282 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4283 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4284 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4285 _start = os::elapsedTime(); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4286 } |
| 342 | 4287 |
| 1709 | 4288 void |
| 4289 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
| 4290 { | |
| 4291 st->print_raw_cr("GC Termination Stats"); | |
| 4292 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
| 4293 " ------waste (KiB)------"); | |
| 4294 st->print_raw_cr("thr ms ms % ms % attempts" | |
| 4295 " total alloc undo"); | |
| 4296 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
| 4297 " ------- ------- -------"); | |
| 4298 } | |
| 4299 | |
| 4300 void | |
| 4301 G1ParScanThreadState::print_termination_stats(int i, | |
| 4302 outputStream* const st) const | |
| 4303 { | |
| 4304 const double elapsed_ms = elapsed_time() * 1000.0; | |
| 4305 const double s_roots_ms = strong_roots_time() * 1000.0; | |
| 4306 const double term_ms = term_time() * 1000.0; | |
| 4307 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
| 4308 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
| 4309 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
| 4310 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
| 4311 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
| 4312 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
| 4313 alloc_buffer_waste() * HeapWordSize / K, | |
| 4314 undo_waste() * HeapWordSize / K); | |
| 4315 } | |
| 4316 | |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4317 #ifdef ASSERT |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4318 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4319 assert(ref != NULL, "invariant"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4320 assert(UseCompressedOops, "sanity"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4321 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4322 oop p = oopDesc::load_decode_heap_oop(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4323 assert(_g1h->is_in_g1_reserved(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4324 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4325 return true; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4326 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4327 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4328 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4329 assert(ref != NULL, "invariant"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4330 if (has_partial_array_mask(ref)) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4331 // Must be in the collection set--it's already been copied. |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4332 oop p = clear_partial_array_mask(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4333 assert(_g1h->obj_in_cs(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4334 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4335 } else { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4336 oop p = oopDesc::load_decode_heap_oop(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4337 assert(_g1h->is_in_g1_reserved(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4338 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4339 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4340 return true; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4341 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4342 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4343 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4344 if (ref.is_narrow()) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4345 return verify_ref((narrowOop*) ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4346 } else { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4347 return verify_ref((oop*) ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4348 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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|
4349 } |
|
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4350 #endif // ASSERT |
|
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|
4351 |
|
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|
4352 void G1ParScanThreadState::trim_queue() { |
|
3979
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6484982: G1: process references during evacuation pauses
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|
4353 assert(_evac_cl != NULL, "not set"); |
|
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6484982: G1: process references during evacuation pauses
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|
4354 assert(_evac_failure_cl != NULL, "not set"); |
|
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6484982: G1: process references during evacuation pauses
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|
4355 assert(_partial_scan_cl != NULL, "not set"); |
|
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6484982: G1: process references during evacuation pauses
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|
4356 |
|
1862
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|
4357 StarTask ref; |
|
b14ec34b1e07
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|
4358 do { |
|
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|
4359 // Drain the overflow stack first, so other threads can steal. |
|
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4360 while (refs()->pop_overflow(ref)) { |
|
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4361 deal_with_reference(ref); |
|
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4362 } |
|
3979
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|
4363 |
|
1862
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|
4364 while (refs()->pop_local(ref)) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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|
4365 deal_with_reference(ref); |
|
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4366 } |
|
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|
4367 } while (!refs()->is_empty()); |
|
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|
4368 } |
|
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|
4369 |
| 342 | 4370 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : |
| 4371 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), | |
|
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|
4372 _par_scan_state(par_scan_state), |
|
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|
4373 _during_initial_mark(_g1->g1_policy()->during_initial_mark_pause()), |
|
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|
4374 _mark_in_progress(_g1->mark_in_progress()) { } |
|
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|
4375 |
|
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7080389: G1: refactor marking code in evacuation pause copy closures
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|
4376 template <class T> void G1ParCopyHelper::mark_object(T* p) { |
|
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|
4377 // This is called from do_oop_work for objects that are not |
|
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|
4378 // in the collection set. Objects in the collection set |
|
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|
4379 // are marked after they have been evacuated. |
| 342 | 4380 |
|
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|
4381 T heap_oop = oopDesc::load_heap_oop(p); |
|
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|
4382 if (!oopDesc::is_null(heap_oop)) { |
|
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|
4383 oop obj = oopDesc::decode_heap_oop(heap_oop); |
|
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|
4384 HeapWord* addr = (HeapWord*)obj; |
|
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
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3317
diff
changeset
|
4385 if (_g1->is_in_g1_reserved(addr)) { |
| 342 | 4386 _cm->grayRoot(oop(addr)); |
|
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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|
4387 } |
| 342 | 4388 } |
| 4389 } | |
| 4390 | |
|
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7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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|
4391 oop G1ParCopyHelper::copy_to_survivor_space(oop old, bool should_mark_root, |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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|
4392 bool should_mark_copy) { |
| 342 | 4393 size_t word_sz = old->size(); |
| 4394 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
| 4395 // +1 to make the -1 indexes valid... | |
| 4396 int young_index = from_region->young_index_in_cset()+1; | |
| 4397 assert( (from_region->is_young() && young_index > 0) || | |
| 4398 (!from_region->is_young() && young_index == 0), "invariant" ); | |
| 4399 G1CollectorPolicy* g1p = _g1->g1_policy(); | |
| 4400 markOop m = old->mark(); | |
| 545 | 4401 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
| 4402 : m->age(); | |
| 4403 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
| 342 | 4404 word_sz); |
| 4405 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
| 4406 oop obj = oop(obj_ptr); | |
| 4407 | |
| 4408 if (obj_ptr == NULL) { | |
| 4409 // This will either forward-to-self, or detect that someone else has | |
| 4410 // installed a forwarding pointer. | |
| 4411 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
|
3973
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7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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changeset
|
4412 return _g1->handle_evacuation_failure_par(cl, old, should_mark_root); |
| 342 | 4413 } |
| 4414 | |
| 526 | 4415 // We're going to allocate linearly, so might as well prefetch ahead. |
| 4416 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
| 4417 | |
| 342 | 4418 oop forward_ptr = old->forward_to_atomic(obj); |
| 4419 if (forward_ptr == NULL) { | |
| 4420 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
| 526 | 4421 if (g1p->track_object_age(alloc_purpose)) { |
| 4422 // We could simply do obj->incr_age(). However, this causes a | |
| 4423 // performance issue. obj->incr_age() will first check whether | |
| 4424 // the object has a displaced mark by checking its mark word; | |
| 4425 // getting the mark word from the new location of the object | |
| 4426 // stalls. So, given that we already have the mark word and we | |
| 4427 // are about to install it anyway, it's better to increase the | |
| 4428 // age on the mark word, when the object does not have a | |
| 4429 // displaced mark word. We're not expecting many objects to have | |
| 4430 // a displaced marked word, so that case is not optimized | |
| 4431 // further (it could be...) and we simply call obj->incr_age(). | |
| 4432 | |
| 4433 if (m->has_displaced_mark_helper()) { | |
| 4434 // in this case, we have to install the mark word first, | |
| 4435 // otherwise obj looks to be forwarded (the old mark word, | |
| 4436 // which contains the forward pointer, was copied) | |
| 4437 obj->set_mark(m); | |
| 4438 obj->incr_age(); | |
| 4439 } else { | |
| 4440 m = m->incr_age(); | |
| 545 | 4441 obj->set_mark(m); |
| 526 | 4442 } |
| 545 | 4443 _par_scan_state->age_table()->add(obj, word_sz); |
| 4444 } else { | |
| 4445 obj->set_mark(m); | |
| 526 | 4446 } |
| 4447 | |
|
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7080389: G1: refactor marking code in evacuation pause copy closures
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|
4448 // Mark the evacuated object or propagate "next" mark bit |
|
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|
4449 if (should_mark_copy) { |
| 342 | 4450 if (!use_local_bitmaps || |
| 4451 !_par_scan_state->alloc_buffer(alloc_purpose)->mark(obj_ptr)) { | |
| 4452 // if we couldn't mark it on the local bitmap (this happens when | |
| 4453 // the object was not allocated in the GCLab), we have to bite | |
| 4454 // the bullet and do the standard parallel mark | |
| 4455 _cm->markAndGrayObjectIfNecessary(obj); | |
| 4456 } | |
|
3886
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7080389: G1: refactor marking code in evacuation pause copy closures
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|
4457 |
| 342 | 4458 if (_g1->isMarkedNext(old)) { |
|
3886
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7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4459 // Unmark the object's old location so that marking |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4460 // doesn't think the old object is alive. |
| 342 | 4461 _cm->nextMarkBitMap()->parClear((HeapWord*)old); |
| 4462 } | |
| 4463 } | |
| 4464 | |
| 4465 size_t* surv_young_words = _par_scan_state->surviving_young_words(); | |
| 4466 surv_young_words[young_index] += word_sz; | |
| 4467 | |
| 4468 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
| 4469 arrayOop(old)->set_length(0); | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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changeset
|
4470 oop* old_p = set_partial_array_mask(old); |
|
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
4471 _par_scan_state->push_on_queue(old_p); |
| 342 | 4472 } else { |
| 526 | 4473 // No point in using the slower heap_region_containing() method, |
| 4474 // given that we know obj is in the heap. | |
| 4475 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
| 342 | 4476 obj->oop_iterate_backwards(_scanner); |
| 4477 } | |
| 4478 } else { | |
| 4479 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
| 4480 obj = forward_ptr; | |
| 4481 } | |
| 4482 return obj; | |
| 4483 } | |
| 4484 | |
|
3886
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7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4485 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
|
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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changeset
|
4486 template <class T> |
|
3886
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7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4487 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> |
|
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
4488 ::do_oop_work(T* p) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
4489 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 4490 assert(barrier != G1BarrierRS || obj != NULL, |
| 4491 "Precondition: G1BarrierRS implies obj is nonNull"); | |
| 4492 | |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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parents:
3869
diff
changeset
|
4493 // Marking: |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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3869
diff
changeset
|
4494 // If the object is in the collection set, then the thread |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4495 // that copies the object should mark, or propagate the |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4496 // mark to, the evacuated object. |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
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diff
changeset
|
4497 // If the object is not in the collection set then we |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4498 // should call the mark_object() method depending on the |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4499 // value of the template parameter do_mark_object (which will |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4500 // be true for root scanning closures during an initial mark |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4501 // pause). |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4502 // The mark_object() method first checks whether the object |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4503 // is marked and, if not, attempts to mark the object. |
|
eeae91c9baba
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diff
changeset
|
4504 |
| 526 | 4505 // here the null check is implicit in the cset_fast_test() test |
|
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
4506 if (_g1->in_cset_fast_test(obj)) { |
| 526 | 4507 if (obj->is_forwarded()) { |
|
845
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|
4508 oopDesc::encode_store_heap_oop(p, obj->forwardee()); |
|
3886
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|
4509 // If we are a root scanning closure during an initial |
|
eeae91c9baba
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diff
changeset
|
4510 // mark pause (i.e. do_mark_object will be true) then |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4511 // we also need to handle marking of roots in the |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4512 // event of an evacuation failure. In the event of an |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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changeset
|
4513 // evacuation failure, the object is forwarded to itself |
|
3973
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diff
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|
4514 // and not copied. For root-scanning closures, the |
|
663cb89032b1
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diff
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|
4515 // object would be marked after a successful self-forward |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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|
4516 // but an object could be pointed to by both a root and non |
|
663cb89032b1
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|
4517 // root location and be self-forwarded by a non-root-scanning |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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|
4518 // closure. Therefore we also have to attempt to mark the |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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diff
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|
4519 // self-forwarded root object here. |
|
3886
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diff
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|
4520 if (do_mark_object && obj->forwardee() == obj) { |
|
eeae91c9baba
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diff
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|
4521 mark_object(p); |
|
eeae91c9baba
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changeset
|
4522 } |
| 526 | 4523 } else { |
|
3973
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|
4524 // During an initial mark pause, objects that are pointed to |
|
663cb89032b1
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|
4525 // by the roots need to be marked - even in the event of an |
|
663cb89032b1
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|
4526 // evacuation failure. We pass the template parameter |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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diff
changeset
|
4527 // do_mark_object (which is true for root scanning closures |
|
663cb89032b1
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diff
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|
4528 // during an initial mark pause) to copy_to_survivor_space |
|
663cb89032b1
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|
4529 // which will pass it on to the evacuation failure handling |
|
663cb89032b1
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changeset
|
4530 // code. The thread that successfully self-forwards a root |
|
663cb89032b1
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|
4531 // object to itself is responsible for marking the object. |
|
663cb89032b1
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changeset
|
4532 bool should_mark_root = do_mark_object; |
|
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|
4533 |
|
3886
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changeset
|
4534 // We need to mark the copied object if we're a root scanning |
|
eeae91c9baba
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diff
changeset
|
4535 // closure during an initial mark pause (i.e. do_mark_object |
|
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|
4536 // will be true), or the object is already marked and we need |
|
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|
4537 // to propagate the mark to the evacuated copy. |
|
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|
4538 bool should_mark_copy = do_mark_object || |
|
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|
4539 _during_initial_mark || |
|
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|
4540 (_mark_in_progress && !_g1->is_obj_ill(obj)); |
|
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|
4541 |
|
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|
4542 oop copy_oop = copy_to_survivor_space(obj, should_mark_root, |
|
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|
4543 should_mark_copy); |
|
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|
4544 oopDesc::encode_store_heap_oop(p, copy_oop); |
| 342 | 4545 } |
| 526 | 4546 // When scanning the RS, we only care about objs in CS. |
| 4547 if (barrier == G1BarrierRS) { | |
|
616
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|
4548 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 342 | 4549 } |
|
3886
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|
4550 } else { |
|
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|
4551 // The object is not in collection set. If we're a root scanning |
|
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|
4552 // closure during an initial mark pause (i.e. do_mark_object will |
|
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|
4553 // be true) then attempt to mark the object. |
|
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|
4554 if (do_mark_object) { |
|
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|
4555 mark_object(p); |
|
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|
4556 } |
| 526 | 4557 } |
| 4558 | |
| 4559 if (barrier == G1BarrierEvac && obj != NULL) { | |
|
616
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|
4560 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 526 | 4561 } |
| 4562 | |
| 4563 if (do_gen_barrier && obj != NULL) { | |
| 4564 par_do_barrier(p); | |
| 4565 } | |
| 4566 } | |
| 4567 | |
|
1261
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|
4568 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
|
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|
4569 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
|
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|
4570 |
|
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|
4571 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
| 526 | 4572 assert(has_partial_array_mask(p), "invariant"); |
| 4573 oop old = clear_partial_array_mask(p); | |
| 342 | 4574 assert(old->is_objArray(), "must be obj array"); |
| 4575 assert(old->is_forwarded(), "must be forwarded"); | |
| 4576 assert(Universe::heap()->is_in_reserved(old), "must be in heap."); | |
| 4577 | |
| 4578 objArrayOop obj = objArrayOop(old->forwardee()); | |
| 4579 assert((void*)old != (void*)old->forwardee(), "self forwarding here?"); | |
| 4580 // Process ParGCArrayScanChunk elements now | |
| 4581 // and push the remainder back onto queue | |
| 4582 int start = arrayOop(old)->length(); | |
| 4583 int end = obj->length(); | |
| 4584 int remainder = end - start; | |
| 4585 assert(start <= end, "just checking"); | |
| 4586 if (remainder > 2 * ParGCArrayScanChunk) { | |
| 4587 // Test above combines last partial chunk with a full chunk | |
| 4588 end = start + ParGCArrayScanChunk; | |
| 4589 arrayOop(old)->set_length(end); | |
| 4590 // Push remainder. | |
|
845
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|
4591 oop* old_p = set_partial_array_mask(old); |
|
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|
4592 assert(arrayOop(old)->length() < obj->length(), "Empty push?"); |
|
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|
4593 _par_scan_state->push_on_queue(old_p); |
| 342 | 4594 } else { |
| 4595 // Restore length so that the heap remains parsable in | |
| 4596 // case of evacuation failure. | |
| 4597 arrayOop(old)->set_length(end); | |
| 4598 } | |
|
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|
4599 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
| 342 | 4600 // process our set of indices (include header in first chunk) |
|
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|
4601 obj->oop_iterate_range(&_scanner, start, end); |
| 342 | 4602 } |
| 4603 | |
| 4604 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
| 4605 protected: | |
| 4606 G1CollectedHeap* _g1h; | |
| 4607 G1ParScanThreadState* _par_scan_state; | |
| 4608 RefToScanQueueSet* _queues; | |
| 4609 ParallelTaskTerminator* _terminator; | |
| 4610 | |
| 4611 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
| 4612 RefToScanQueueSet* queues() { return _queues; } | |
| 4613 ParallelTaskTerminator* terminator() { return _terminator; } | |
| 4614 | |
| 4615 public: | |
| 4616 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
| 4617 G1ParScanThreadState* par_scan_state, | |
| 4618 RefToScanQueueSet* queues, | |
| 4619 ParallelTaskTerminator* terminator) | |
| 4620 : _g1h(g1h), _par_scan_state(par_scan_state), | |
| 4621 _queues(queues), _terminator(terminator) {} | |
| 4622 | |
|
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|
4623 void do_void(); |
|
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|
4624 |
|
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|
4625 private: |
|
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|
4626 inline bool offer_termination(); |
|
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|
4627 }; |
|
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|
4628 |
|
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|
4629 bool G1ParEvacuateFollowersClosure::offer_termination() { |
|
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|
4630 G1ParScanThreadState* const pss = par_scan_state(); |
|
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|
4631 pss->start_term_time(); |
|
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|
4632 const bool res = terminator()->offer_termination(); |
|
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|
4633 pss->end_term_time(); |
|
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|
4634 return res; |
|
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|
4635 } |
|
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|
4636 |
|
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|
4637 void G1ParEvacuateFollowersClosure::do_void() { |
|
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|
4638 StarTask stolen_task; |
|
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|
4639 G1ParScanThreadState* const pss = par_scan_state(); |
|
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|
4640 pss->trim_queue(); |
|
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|
4641 |
|
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|
4642 do { |
|
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changeset
|
4643 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
|
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|
4644 assert(pss->verify_task(stolen_task), "sanity"); |
|
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|
4645 if (stolen_task.is_narrow()) { |
|
1883
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|
4646 pss->deal_with_reference((narrowOop*) stolen_task); |
|
1862
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|
4647 } else { |
|
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|
4648 pss->deal_with_reference((oop*) stolen_task); |
|
1862
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|
4649 } |
|
1883
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|
4650 |
|
35e4e086d5f5
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changeset
|
4651 // We've just processed a reference and we might have made |
|
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|
4652 // available new entries on the queues. So we have to make sure |
|
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|
4653 // we drain the queues as necessary. |
| 342 | 4654 pss->trim_queue(); |
| 4655 } | |
|
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|
4656 } while (!offer_termination()); |
|
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changeset
|
4657 |
|
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changeset
|
4658 pss->retire_alloc_buffers(); |
|
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|
4659 } |
| 342 | 4660 |
| 4661 class G1ParTask : public AbstractGangTask { | |
| 4662 protected: | |
| 4663 G1CollectedHeap* _g1h; | |
| 4664 RefToScanQueueSet *_queues; | |
| 4665 ParallelTaskTerminator _terminator; | |
|
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|
4666 int _n_workers; |
| 342 | 4667 |
| 4668 Mutex _stats_lock; | |
| 4669 Mutex* stats_lock() { return &_stats_lock; } | |
| 4670 | |
| 4671 size_t getNCards() { | |
| 4672 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
| 4673 / G1BlockOffsetSharedArray::N_bytes; | |
| 4674 } | |
| 4675 | |
| 4676 public: | |
|
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|
4677 G1ParTask(G1CollectedHeap* g1h, |
|
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changeset
|
4678 RefToScanQueueSet *task_queues) |
| 342 | 4679 : AbstractGangTask("G1 collection"), |
| 4680 _g1h(g1h), | |
| 4681 _queues(task_queues), | |
|
4095
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|
4682 _terminator(0, _queues), |
|
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|
4683 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true) |
| 342 | 4684 {} |
| 4685 | |
| 4686 RefToScanQueueSet* queues() { return _queues; } | |
| 4687 | |
| 4688 RefToScanQueue *work_queue(int i) { | |
| 4689 return queues()->queue(i); | |
| 4690 } | |
| 4691 | |
|
4095
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|
4692 ParallelTaskTerminator* terminator() { return &_terminator; } |
|
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|
4693 |
|
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|
4694 virtual void set_for_termination(int active_workers) { |
|
bca17e38de00
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|
4695 // This task calls set_n_termination() in par_non_clean_card_iterate_work() |
|
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|
4696 // in the young space (_par_seq_tasks) in the G1 heap |
|
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|
4697 // for SequentialSubTasksDone. |
|
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|
4698 // This task also uses SubTasksDone in SharedHeap and G1CollectedHeap |
|
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|
4699 // both of which need setting by set_n_termination(). |
|
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|
4700 _g1h->SharedHeap::set_n_termination(active_workers); |
|
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|
4701 _g1h->set_n_termination(active_workers); |
|
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|
4702 terminator()->reset_for_reuse(active_workers); |
|
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|
4703 _n_workers = active_workers; |
|
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|
4704 } |
|
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|
4705 |
| 342 | 4706 void work(int i) { |
|
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|
4707 if (i >= _n_workers) return; // no work needed this round |
| 1611 | 4708 |
| 4709 double start_time_ms = os::elapsedTime() * 1000.0; | |
| 4710 _g1h->g1_policy()->record_gc_worker_start_time(i, start_time_ms); | |
| 4711 | |
| 342 | 4712 ResourceMark rm; |
| 4713 HandleMark hm; | |
| 4714 | |
|
3979
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|
4715 ReferenceProcessor* rp = _g1h->ref_processor_stw(); |
|
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|
4716 |
| 526 | 4717 G1ParScanThreadState pss(_g1h, i); |
|
3979
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|
4718 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, rp); |
|
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|
4719 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, rp); |
|
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|
4720 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, rp); |
| 342 | 4721 |
| 4722 pss.set_evac_closure(&scan_evac_cl); | |
| 4723 pss.set_evac_failure_closure(&evac_failure_cl); | |
| 4724 pss.set_partial_scan_closure(&partial_scan_cl); | |
| 4725 | |
|
3979
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|
4726 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss, rp); |
|
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|
4727 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss, rp); |
|
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|
4728 |
|
4dfb2df418f2
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|
4729 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss, rp); |
|
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|
4730 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss, rp); |
|
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|
4731 |
|
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|
4732 OopClosure* scan_root_cl = &only_scan_root_cl; |
|
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|
4733 OopsInHeapRegionClosure* scan_perm_cl = &only_scan_perm_cl; |
| 342 | 4734 |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
4735 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
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|
4736 // We also need to mark copied objects. |
| 342 | 4737 scan_root_cl = &scan_mark_root_cl; |
| 4738 scan_perm_cl = &scan_mark_perm_cl; | |
| 4739 } | |
| 4740 | |
|
3983
811ec3d0833b
7097053: G1: assert(da ? referent->is_oop() : referent->is_oop_or_null()) failed: referenceProcessor.cpp:1054
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|
4741 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
|
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|
4742 |
| 342 | 4743 pss.start_strong_roots(); |
| 4744 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
| 4745 SharedHeap::SO_AllClasses, | |
| 4746 scan_root_cl, | |
|
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|
4747 &push_heap_rs_cl, |
| 342 | 4748 scan_perm_cl, |
| 4749 i); | |
| 4750 pss.end_strong_roots(); | |
|
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|
4751 |
| 342 | 4752 { |
| 4753 double start = os::elapsedTime(); | |
| 4754 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
| 4755 evac.do_void(); | |
| 4756 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
| 4757 double term_ms = pss.term_time()*1000.0; | |
| 4758 _g1h->g1_policy()->record_obj_copy_time(i, elapsed_ms-term_ms); | |
| 1611 | 4759 _g1h->g1_policy()->record_termination(i, term_ms, pss.term_attempts()); |
| 342 | 4760 } |
| 1282 | 4761 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
| 342 | 4762 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
| 4763 | |
| 4764 // Clean up any par-expanded rem sets. | |
| 4765 HeapRegionRemSet::par_cleanup(); | |
| 4766 | |
| 4767 if (ParallelGCVerbose) { | |
| 1709 | 4768 MutexLocker x(stats_lock()); |
| 4769 pss.print_termination_stats(i); | |
| 342 | 4770 } |
| 4771 | |
|
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|
4772 assert(pss.refs()->is_empty(), "should be empty"); |
| 1611 | 4773 double end_time_ms = os::elapsedTime() * 1000.0; |
| 4774 _g1h->g1_policy()->record_gc_worker_end_time(i, end_time_ms); | |
| 342 | 4775 } |
| 4776 }; | |
| 4777 | |
| 4778 // *** Common G1 Evacuation Stuff | |
| 4779 | |
|
1833
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|
4780 // This method is run in a GC worker. |
|
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|
4781 |
| 342 | 4782 void |
| 4783 G1CollectedHeap:: | |
| 4784 g1_process_strong_roots(bool collecting_perm_gen, | |
| 4785 SharedHeap::ScanningOption so, | |
| 4786 OopClosure* scan_non_heap_roots, | |
| 4787 OopsInHeapRegionClosure* scan_rs, | |
| 4788 OopsInGenClosure* scan_perm, | |
| 4789 int worker_i) { | |
|
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|
4790 |
| 342 | 4791 // First scan the strong roots, including the perm gen. |
| 4792 double ext_roots_start = os::elapsedTime(); | |
| 4793 double closure_app_time_sec = 0.0; | |
| 4794 | |
| 4795 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
| 4796 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
| 4797 buf_scan_perm.set_generation(perm_gen()); | |
| 4798 | |
|
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|
4799 // Walk the code cache w/o buffering, because StarTask cannot handle |
|
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|
4800 // unaligned oop locations. |
|
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changeset
|
4801 CodeBlobToOopClosure eager_scan_code_roots(scan_non_heap_roots, /*do_marking=*/ true); |
|
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|
4802 |
|
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|
4803 process_strong_roots(false, // no scoping; this is parallel code |
|
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|
4804 collecting_perm_gen, so, |
| 342 | 4805 &buf_scan_non_heap_roots, |
|
989
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|
4806 &eager_scan_code_roots, |
| 342 | 4807 &buf_scan_perm); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
4808 |
|
3979
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|
4809 // Now the CM ref_processor roots. |
|
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|
4810 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { |
|
3979
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|
4811 // We need to treat the discovered reference lists of the |
|
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|
4812 // concurrent mark ref processor as roots and keep entries |
|
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|
4813 // (which are added by the marking threads) on them live |
|
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|
4814 // until they can be processed at the end of marking. |
|
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|
4815 ref_processor_cm()->weak_oops_do(&buf_scan_non_heap_roots); |
|
3823
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|
4816 } |
|
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|
4817 |
|
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|
4818 // Finish up any enqueued closure apps (attributed as object copy time). |
| 342 | 4819 buf_scan_non_heap_roots.done(); |
| 4820 buf_scan_perm.done(); | |
|
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|
4821 |
| 342 | 4822 double ext_roots_end = os::elapsedTime(); |
|
3823
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|
4823 |
| 342 | 4824 g1_policy()->reset_obj_copy_time(worker_i); |
|
3823
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|
4825 double obj_copy_time_sec = buf_scan_perm.closure_app_seconds() + |
|
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changeset
|
4826 buf_scan_non_heap_roots.closure_app_seconds(); |
| 342 | 4827 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); |
|
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|
4828 |
| 342 | 4829 double ext_root_time_ms = |
| 4830 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
|
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|
4831 |
| 342 | 4832 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); |
| 4833 | |
| 4834 // Scan strong roots in mark stack. | |
| 4835 if (!_process_strong_tasks->is_task_claimed(G1H_PS_mark_stack_oops_do)) { | |
| 4836 concurrent_mark()->oops_do(scan_non_heap_roots); | |
| 4837 } | |
| 4838 double mark_stack_scan_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; | |
| 4839 g1_policy()->record_mark_stack_scan_time(worker_i, mark_stack_scan_ms); | |
| 4840 | |
| 4841 // Now scan the complement of the collection set. | |
| 4842 if (scan_rs != NULL) { | |
| 4843 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
| 4844 } | |
|
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|
4845 |
| 342 | 4846 _process_strong_tasks->all_tasks_completed(); |
| 4847 } | |
| 4848 | |
| 4849 void | |
| 4850 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
| 4851 OopClosure* non_root_closure) { | |
|
989
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890
diff
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|
4852 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
|
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|
4853 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
| 342 | 4854 } |
| 4855 | |
|
3979
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|
4856 // Weak Reference Processing support |
|
4dfb2df418f2
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|
4857 |
|
4dfb2df418f2
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|
4858 // An always "is_alive" closure that is used to preserve referents. |
|
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|
4859 // If the object is non-null then it's alive. Used in the preservation |
|
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|
4860 // of referent objects that are pointed to by reference objects |
|
4dfb2df418f2
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diff
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|
4861 // discovered by the CM ref processor. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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changeset
|
4862 class G1AlwaysAliveClosure: public BoolObjectClosure { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4863 G1CollectedHeap* _g1; |
|
4dfb2df418f2
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|
4864 public: |
|
4dfb2df418f2
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changeset
|
4865 G1AlwaysAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
|
4dfb2df418f2
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changeset
|
4866 void do_object(oop p) { assert(false, "Do not call."); } |
|
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|
4867 bool do_object_b(oop p) { |
|
4dfb2df418f2
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changeset
|
4868 if (p != NULL) { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4869 return true; |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4870 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
4871 return false; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4872 } |
|
4dfb2df418f2
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diff
changeset
|
4873 }; |
|
4dfb2df418f2
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|
4874 |
|
4dfb2df418f2
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changeset
|
4875 bool G1STWIsAliveClosure::do_object_b(oop p) { |
|
4dfb2df418f2
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|
4876 // An object is reachable if it is outside the collection set, |
|
4dfb2df418f2
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|
4877 // or is inside and copied. |
|
4dfb2df418f2
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changeset
|
4878 return !_g1->obj_in_cs(p) || p->is_forwarded(); |
|
4dfb2df418f2
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|
4879 } |
|
4dfb2df418f2
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changeset
|
4880 |
|
4dfb2df418f2
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changeset
|
4881 // Non Copying Keep Alive closure |
|
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|
4882 class G1KeepAliveClosure: public OopClosure { |
|
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|
4883 G1CollectedHeap* _g1; |
|
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|
4884 public: |
|
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changeset
|
4885 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
|
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|
4886 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
|
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|
4887 void do_oop( oop* p) { |
|
4dfb2df418f2
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|
4888 oop obj = *p; |
|
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|
4889 |
|
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|
4890 if (_g1->obj_in_cs(obj)) { |
|
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|
4891 assert( obj->is_forwarded(), "invariant" ); |
|
4dfb2df418f2
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diff
changeset
|
4892 *p = obj->forwardee(); |
|
4dfb2df418f2
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|
4893 } |
|
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|
4894 } |
|
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|
4895 }; |
|
4dfb2df418f2
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|
4896 |
|
4dfb2df418f2
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|
4897 // Copying Keep Alive closure - can be called from both |
|
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|
4898 // serial and parallel code as long as different worker |
|
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|
4899 // threads utilize different G1ParScanThreadState instances |
|
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|
4900 // and different queues. |
|
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|
4901 |
|
4dfb2df418f2
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|
4902 class G1CopyingKeepAliveClosure: public OopClosure { |
|
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|
4903 G1CollectedHeap* _g1h; |
|
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|
4904 OopClosure* _copy_non_heap_obj_cl; |
|
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|
4905 OopsInHeapRegionClosure* _copy_perm_obj_cl; |
|
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|
4906 G1ParScanThreadState* _par_scan_state; |
|
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|
4907 |
|
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|
4908 public: |
|
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changeset
|
4909 G1CopyingKeepAliveClosure(G1CollectedHeap* g1h, |
|
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changeset
|
4910 OopClosure* non_heap_obj_cl, |
|
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|
4911 OopsInHeapRegionClosure* perm_obj_cl, |
|
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|
4912 G1ParScanThreadState* pss): |
|
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changeset
|
4913 _g1h(g1h), |
|
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6484982: G1: process references during evacuation pauses
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changeset
|
4914 _copy_non_heap_obj_cl(non_heap_obj_cl), |
|
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changeset
|
4915 _copy_perm_obj_cl(perm_obj_cl), |
|
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changeset
|
4916 _par_scan_state(pss) |
|
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changeset
|
4917 {} |
|
4dfb2df418f2
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changeset
|
4918 |
|
4dfb2df418f2
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changeset
|
4919 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
4dfb2df418f2
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changeset
|
4920 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
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changeset
|
4921 |
|
4dfb2df418f2
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changeset
|
4922 template <class T> void do_oop_work(T* p) { |
|
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changeset
|
4923 oop obj = oopDesc::load_decode_heap_oop(p); |
|
4dfb2df418f2
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changeset
|
4924 |
|
4dfb2df418f2
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changeset
|
4925 if (_g1h->obj_in_cs(obj)) { |
|
4dfb2df418f2
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|
4926 // If the referent object has been forwarded (either copied |
|
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changeset
|
4927 // to a new location or to itself in the event of an |
|
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|
4928 // evacuation failure) then we need to update the reference |
|
4dfb2df418f2
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|
4929 // field and, if both reference and referent are in the G1 |
|
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changeset
|
4930 // heap, update the RSet for the referent. |
|
4dfb2df418f2
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changeset
|
4931 // |
|
4dfb2df418f2
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changeset
|
4932 // If the referent has not been forwarded then we have to keep |
|
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|
4933 // it alive by policy. Therefore we have copy the referent. |
|
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|
4934 // |
|
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changeset
|
4935 // If the reference field is in the G1 heap then we can push |
|
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|
4936 // on the PSS queue. When the queue is drained (after each |
|
4dfb2df418f2
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changeset
|
4937 // phase of reference processing) the object and it's followers |
|
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|
4938 // will be copied, the reference field set to point to the |
|
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changeset
|
4939 // new location, and the RSet updated. Otherwise we need to |
|
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|
4940 // use the the non-heap or perm closures directly to copy |
|
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changeset
|
4941 // the refernt object and update the pointer, while avoiding |
|
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changeset
|
4942 // updating the RSet. |
|
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changeset
|
4943 |
|
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changeset
|
4944 if (_g1h->is_in_g1_reserved(p)) { |
|
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changeset
|
4945 _par_scan_state->push_on_queue(p); |
|
4dfb2df418f2
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changeset
|
4946 } else { |
|
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changeset
|
4947 // The reference field is not in the G1 heap. |
|
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changeset
|
4948 if (_g1h->perm_gen()->is_in(p)) { |
|
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changeset
|
4949 _copy_perm_obj_cl->do_oop(p); |
|
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|
4950 } else { |
|
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changeset
|
4951 _copy_non_heap_obj_cl->do_oop(p); |
|
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|
4952 } |
|
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changeset
|
4953 } |
|
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changeset
|
4954 } |
|
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changeset
|
4955 } |
|
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changeset
|
4956 }; |
|
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changeset
|
4957 |
|
4dfb2df418f2
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changeset
|
4958 // Serial drain queue closure. Called as the 'complete_gc' |
|
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|
4959 // closure for each discovered list in some of the |
|
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changeset
|
4960 // reference processing phases. |
|
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changeset
|
4961 |
|
4dfb2df418f2
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changeset
|
4962 class G1STWDrainQueueClosure: public VoidClosure { |
|
4dfb2df418f2
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parents:
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|
4963 protected: |
|
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diff
changeset
|
4964 G1CollectedHeap* _g1h; |
|
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|
4965 G1ParScanThreadState* _par_scan_state; |
|
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changeset
|
4966 |
|
4dfb2df418f2
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diff
changeset
|
4967 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } |
|
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changeset
|
4968 |
|
4dfb2df418f2
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diff
changeset
|
4969 public: |
|
4dfb2df418f2
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diff
changeset
|
4970 G1STWDrainQueueClosure(G1CollectedHeap* g1h, G1ParScanThreadState* pss) : |
|
4dfb2df418f2
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changeset
|
4971 _g1h(g1h), |
|
4dfb2df418f2
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diff
changeset
|
4972 _par_scan_state(pss) |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4973 { } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4974 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4975 void do_void() { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4976 G1ParScanThreadState* const pss = par_scan_state(); |
|
4dfb2df418f2
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diff
changeset
|
4977 pss->trim_queue(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4978 } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4979 }; |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4980 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4981 // Parallel Reference Processing closures |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4982 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4983 // Implementation of AbstractRefProcTaskExecutor for parallel reference |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4984 // processing during G1 evacuation pauses. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4985 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4986 class G1STWRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4987 private: |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4988 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
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diff
changeset
|
4989 RefToScanQueueSet* _queues; |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
4990 FlexibleWorkGang* _workers; |
|
3979
4dfb2df418f2
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parents:
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diff
changeset
|
4991 int _active_workers; |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
4992 |
|
4dfb2df418f2
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diff
changeset
|
4993 public: |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4994 G1STWRefProcTaskExecutor(G1CollectedHeap* g1h, |
|
4095
bca17e38de00
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jmasa
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4090
diff
changeset
|
4995 FlexibleWorkGang* workers, |
|
3979
4dfb2df418f2
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diff
changeset
|
4996 RefToScanQueueSet *task_queues, |
|
4dfb2df418f2
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diff
changeset
|
4997 int n_workers) : |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4998 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4999 _queues(task_queues), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5000 _workers(workers), |
|
4dfb2df418f2
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diff
changeset
|
5001 _active_workers(n_workers) |
|
4dfb2df418f2
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diff
changeset
|
5002 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5003 assert(n_workers > 0, "shouldn't call this otherwise"); |
|
4dfb2df418f2
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diff
changeset
|
5004 } |
|
4dfb2df418f2
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diff
changeset
|
5005 |
|
4dfb2df418f2
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diff
changeset
|
5006 // Executes the given task using concurrent marking worker threads. |
|
4dfb2df418f2
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diff
changeset
|
5007 virtual void execute(ProcessTask& task); |
|
4dfb2df418f2
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diff
changeset
|
5008 virtual void execute(EnqueueTask& task); |
|
4dfb2df418f2
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diff
changeset
|
5009 }; |
|
4dfb2df418f2
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diff
changeset
|
5010 |
|
4dfb2df418f2
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diff
changeset
|
5011 // Gang task for possibly parallel reference processing |
|
4dfb2df418f2
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diff
changeset
|
5012 |
|
4dfb2df418f2
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diff
changeset
|
5013 class G1STWRefProcTaskProxy: public AbstractGangTask { |
|
4dfb2df418f2
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diff
changeset
|
5014 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
|
4dfb2df418f2
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diff
changeset
|
5015 ProcessTask& _proc_task; |
|
4dfb2df418f2
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diff
changeset
|
5016 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
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diff
changeset
|
5017 RefToScanQueueSet *_task_queues; |
|
4dfb2df418f2
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diff
changeset
|
5018 ParallelTaskTerminator* _terminator; |
|
4dfb2df418f2
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diff
changeset
|
5019 |
|
4dfb2df418f2
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diff
changeset
|
5020 public: |
|
4dfb2df418f2
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diff
changeset
|
5021 G1STWRefProcTaskProxy(ProcessTask& proc_task, |
|
4dfb2df418f2
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diff
changeset
|
5022 G1CollectedHeap* g1h, |
|
4dfb2df418f2
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diff
changeset
|
5023 RefToScanQueueSet *task_queues, |
|
4dfb2df418f2
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diff
changeset
|
5024 ParallelTaskTerminator* terminator) : |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5025 AbstractGangTask("Process reference objects in parallel"), |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5026 _proc_task(proc_task), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5027 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5028 _task_queues(task_queues), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5029 _terminator(terminator) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5030 {} |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5031 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5032 virtual void work(int i) { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5033 // The reference processing task executed by a single worker. |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5034 ResourceMark rm; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5035 HandleMark hm; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5036 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5037 G1STWIsAliveClosure is_alive(_g1h); |
|
4dfb2df418f2
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diff
changeset
|
5038 |
|
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|
5039 G1ParScanThreadState pss(_g1h, i); |
|
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|
5040 |
|
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|
5041 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
|
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|
5042 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
|
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|
5043 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
|
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|
5044 |
|
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|
5045 pss.set_evac_closure(&scan_evac_cl); |
|
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|
5046 pss.set_evac_failure_closure(&evac_failure_cl); |
|
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|
5047 pss.set_partial_scan_closure(&partial_scan_cl); |
|
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|
5048 |
|
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|
5049 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
|
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|
5050 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
|
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|
5051 |
|
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|
5052 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
|
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|
5053 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
|
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|
5054 |
|
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|
5055 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
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|
5056 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
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|
5057 |
|
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|
5058 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
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|
5059 // We also need to mark copied objects. |
|
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|
5060 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
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|
5061 copy_perm_cl = ©_mark_perm_cl; |
|
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|
5062 } |
|
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|
5063 |
|
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|
5064 // Keep alive closure. |
|
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|
5065 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
|
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|
5066 |
|
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|
5067 // Complete GC closure |
|
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|
5068 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _task_queues, _terminator); |
|
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|
5069 |
|
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|
5070 // Call the reference processing task's work routine. |
|
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|
5071 _proc_task.work(i, is_alive, keep_alive, drain_queue); |
|
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|
5072 |
|
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|
5073 // Note we cannot assert that the refs array is empty here as not all |
|
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|
5074 // of the processing tasks (specifically phase2 - pp2_work) execute |
|
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|
5075 // the complete_gc closure (which ordinarily would drain the queue) so |
|
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|
5076 // the queue may not be empty. |
|
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|
5077 } |
|
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|
5078 }; |
|
4dfb2df418f2
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changeset
|
5079 |
|
4dfb2df418f2
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|
5080 // Driver routine for parallel reference processing. |
|
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|
5081 // Creates an instance of the ref processing gang |
|
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|
5082 // task and has the worker threads execute it. |
|
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|
5083 void G1STWRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
|
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|
5084 assert(_workers != NULL, "Need parallel worker threads."); |
|
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|
5085 |
|
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|
5086 ParallelTaskTerminator terminator(_active_workers, _queues); |
|
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|
5087 G1STWRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _queues, &terminator); |
|
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|
5088 |
|
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|
5089 _g1h->set_par_threads(_active_workers); |
|
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|
5090 _workers->run_task(&proc_task_proxy); |
|
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|
5091 _g1h->set_par_threads(0); |
|
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|
5092 } |
|
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changeset
|
5093 |
|
4dfb2df418f2
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|
5094 // Gang task for parallel reference enqueueing. |
|
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changeset
|
5095 |
|
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|
5096 class G1STWRefEnqueueTaskProxy: public AbstractGangTask { |
|
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|
5097 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
|
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|
5098 EnqueueTask& _enq_task; |
|
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changeset
|
5099 |
|
4dfb2df418f2
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|
5100 public: |
|
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|
5101 G1STWRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
|
4dfb2df418f2
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|
5102 AbstractGangTask("Enqueue reference objects in parallel"), |
|
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|
5103 _enq_task(enq_task) |
|
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|
5104 { } |
|
4dfb2df418f2
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diff
changeset
|
5105 |
|
4dfb2df418f2
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diff
changeset
|
5106 virtual void work(int i) { |
|
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changeset
|
5107 _enq_task.work(i); |
|
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|
5108 } |
|
4dfb2df418f2
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changeset
|
5109 }; |
|
4dfb2df418f2
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diff
changeset
|
5110 |
|
4dfb2df418f2
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|
5111 // Driver routine for parallel reference enqueing. |
|
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|
5112 // Creates an instance of the ref enqueueing gang |
|
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|
5113 // task and has the worker threads execute it. |
|
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changeset
|
5114 |
|
4dfb2df418f2
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changeset
|
5115 void G1STWRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
|
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|
5116 assert(_workers != NULL, "Need parallel worker threads."); |
|
4dfb2df418f2
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changeset
|
5117 |
|
4dfb2df418f2
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changeset
|
5118 G1STWRefEnqueueTaskProxy enq_task_proxy(enq_task); |
|
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|
5119 |
|
4dfb2df418f2
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|
5120 _g1h->set_par_threads(_active_workers); |
|
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|
5121 _workers->run_task(&enq_task_proxy); |
|
4dfb2df418f2
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|
5122 _g1h->set_par_threads(0); |
|
4dfb2df418f2
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|
5123 } |
|
4dfb2df418f2
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diff
changeset
|
5124 |
|
4dfb2df418f2
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diff
changeset
|
5125 // End of weak reference support closures |
|
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diff
changeset
|
5126 |
|
4dfb2df418f2
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diff
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|
5127 // Abstract task used to preserve (i.e. copy) any referent objects |
|
4dfb2df418f2
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|
5128 // that are in the collection set and are pointed to by reference |
|
4dfb2df418f2
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changeset
|
5129 // objects discovered by the CM ref processor. |
|
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diff
changeset
|
5130 |
|
4dfb2df418f2
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changeset
|
5131 class G1ParPreserveCMReferentsTask: public AbstractGangTask { |
|
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|
5132 protected: |
|
4dfb2df418f2
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diff
changeset
|
5133 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
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|
5134 RefToScanQueueSet *_queues; |
|
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diff
changeset
|
5135 ParallelTaskTerminator _terminator; |
|
4dfb2df418f2
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diff
changeset
|
5136 int _n_workers; |
|
4dfb2df418f2
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diff
changeset
|
5137 |
|
4dfb2df418f2
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diff
changeset
|
5138 public: |
|
4dfb2df418f2
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diff
changeset
|
5139 G1ParPreserveCMReferentsTask(G1CollectedHeap* g1h,int workers, RefToScanQueueSet *task_queues) : |
|
4dfb2df418f2
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changeset
|
5140 AbstractGangTask("ParPreserveCMReferents"), |
|
4dfb2df418f2
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diff
changeset
|
5141 _g1h(g1h), |
|
4dfb2df418f2
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diff
changeset
|
5142 _queues(task_queues), |
|
4dfb2df418f2
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diff
changeset
|
5143 _terminator(workers, _queues), |
|
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changeset
|
5144 _n_workers(workers) |
|
4dfb2df418f2
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diff
changeset
|
5145 { } |
|
4dfb2df418f2
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diff
changeset
|
5146 |
|
4dfb2df418f2
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changeset
|
5147 void work(int i) { |
|
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diff
changeset
|
5148 ResourceMark rm; |
|
4dfb2df418f2
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diff
changeset
|
5149 HandleMark hm; |
|
4dfb2df418f2
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changeset
|
5150 |
|
4dfb2df418f2
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diff
changeset
|
5151 G1ParScanThreadState pss(_g1h, i); |
|
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|
5152 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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|
5153 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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|
5154 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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changeset
|
5155 |
|
4dfb2df418f2
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changeset
|
5156 pss.set_evac_closure(&scan_evac_cl); |
|
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|
5157 pss.set_evac_failure_closure(&evac_failure_cl); |
|
4dfb2df418f2
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|
5158 pss.set_partial_scan_closure(&partial_scan_cl); |
|
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changeset
|
5159 |
|
4dfb2df418f2
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changeset
|
5160 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
|
4dfb2df418f2
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changeset
|
5161 |
|
4dfb2df418f2
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changeset
|
5162 |
|
4dfb2df418f2
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changeset
|
5163 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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changeset
|
5164 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
|
5165 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5166 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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changeset
|
5167 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5168 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5169 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
4dfb2df418f2
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diff
changeset
|
5170 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5171 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5172 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5173 // We also need to mark copied objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5174 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
4dfb2df418f2
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changeset
|
5175 copy_perm_cl = ©_mark_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5176 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5177 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5178 // Is alive closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5179 G1AlwaysAliveClosure always_alive(_g1h); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5180 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5181 // Copying keep alive closure. Applied to referent objects that need |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5182 // to be copied. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5183 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
|
4dfb2df418f2
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diff
changeset
|
5184 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5185 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5186 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5187 int limit = ReferenceProcessor::number_of_subclasses_of_ref() * rp->max_num_q(); |
|
4dfb2df418f2
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changeset
|
5188 int stride = MIN2(MAX2(_n_workers, 1), limit); |
|
4dfb2df418f2
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diff
changeset
|
5189 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5190 // limit is set using max_num_q() - which was set using ParallelGCThreads. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5191 // 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:
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diff
changeset
|
5192 // change the worker ids. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5193 assert(0 <= i && i < limit, "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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changeset
|
5194 assert(!rp->discovery_is_atomic(), "check this code"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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changeset
|
5195 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5196 // Select discovered lists [i, i+stride, i+2*stride,...,limit) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5197 for (int idx = i; idx < limit; idx += stride) { |
|
4014
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
4013
diff
changeset
|
5198 DiscoveredList& ref_list = rp->discovered_refs()[idx]; |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5199 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5200 DiscoveredListIterator iter(ref_list, &keep_alive, &always_alive); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5201 while (iter.has_next()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5202 // Since discovery is not atomic for the CM ref processor, we |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5203 // 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
|
5204 iter.load_ptrs(DEBUG_ONLY(true)); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5205 oop ref = iter.obj(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5206 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5207 // This will filter nulls. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5208 if (iter.is_referent_alive()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5209 iter.make_referent_alive(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5210 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5211 iter.move_to_next(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5212 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5213 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5214 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5215 // Drain the queue - which may cause stealing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5216 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _queues, &_terminator); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5217 drain_queue.do_void(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5218 // Allocation buffers were retired at the end of G1ParEvacuateFollowersClosure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5219 assert(pss.refs()->is_empty(), "should be"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5220 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5221 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5222 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5223 // Weak Reference processing during an evacuation pause (part 1). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5224 void G1CollectedHeap::process_discovered_references() { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5225 double ref_proc_start = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5226 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5227 ReferenceProcessor* rp = _ref_processor_stw; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5228 assert(rp->discovery_enabled(), "should have been enabled"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5229 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5230 // Any reference objects, in the collection set, that were 'discovered' |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5231 // by the CM ref processor should have already been copied (either by |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5232 // applying the external root copy closure to the discovered lists, or |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5233 // by following an RSet entry). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5234 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5235 // But some of the referents, that are in the collection set, that these |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5236 // 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
|
5237 // processor would have seen that the reference object had already |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5238 // been 'discovered' and would have skipped discovering the reference, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5239 // 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
|
5240 // 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
|
5241 // referent object. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5242 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5243 // We need to explicitly copy these referent objects - the references |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5244 // will be processed at the end of remarking. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5245 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5246 // 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
|
5247 // 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
|
5248 // referents points to another object which is also referenced by an |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5249 // object discovered by the STW ref processor. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5250 |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5251 int active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5252 workers()->active_workers() : 1); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5253 |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5254 assert(active_workers == workers()->active_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5255 "Need to reset active_workers"); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5256 set_par_threads(active_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5257 G1ParPreserveCMReferentsTask keep_cm_referents(this, active_workers, _task_queues); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5258 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5259 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5260 workers()->run_task(&keep_cm_referents); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5261 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5262 keep_cm_referents.work(0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5263 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5264 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5265 set_par_threads(0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5266 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5267 // Closure to test whether a referent is alive. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5268 G1STWIsAliveClosure is_alive(this); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5269 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5270 // Even when parallel reference processing is enabled, the processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5271 // 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
|
5272 // 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
|
5273 // JNI refs. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5274 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5275 // Use only a single queue for this PSS. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5276 G1ParScanThreadState pss(this, 0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5277 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5278 // We do not embed a reference processor in the copying/scanning |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5279 // closures while we're actually processing the discovered |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5280 // reference objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5281 G1ParScanHeapEvacClosure scan_evac_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5282 G1ParScanHeapEvacFailureClosure evac_failure_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5283 G1ParScanPartialArrayClosure partial_scan_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5284 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5285 pss.set_evac_closure(&scan_evac_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5286 pss.set_evac_failure_closure(&evac_failure_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5287 pss.set_partial_scan_closure(&partial_scan_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5288 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5289 assert(pss.refs()->is_empty(), "pre-condition"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5290 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5291 G1ParScanExtRootClosure only_copy_non_heap_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5292 G1ParScanPermClosure only_copy_perm_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5293 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5294 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5295 G1ParScanAndMarkPermClosure copy_mark_perm_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5296 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5297 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5298 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5299 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5300 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5301 // We also need to mark copied objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5302 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5303 copy_perm_cl = ©_mark_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5304 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5305 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5306 // Keep alive closure. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5307 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
|
5308 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5309 // Serial Complete GC closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5310 G1STWDrainQueueClosure drain_queue(this, &pss); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5311 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5312 // Setup the soft refs policy... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5313 rp->setup_policy(false); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5314 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5315 if (!rp->processing_is_mt()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5316 // Serial reference processing... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5317 rp->process_discovered_references(&is_alive, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5318 &keep_alive, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5319 &drain_queue, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5320 NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5321 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5322 // Parallel reference processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5323 assert(rp->num_q() == active_workers, "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5324 assert(active_workers <= rp->max_num_q(), "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5325 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5326 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5327 rp->process_discovered_references(&is_alive, &keep_alive, &drain_queue, &par_task_executor); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5328 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5329 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5330 // We have completed copying any necessary live referent objects |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5331 // (that were not copied during the actual pause) so we can |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5332 // retire any active alloc buffers |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5333 pss.retire_alloc_buffers(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5334 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5335 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5336 double ref_proc_time = os::elapsedTime() - ref_proc_start; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5337 g1_policy()->record_ref_proc_time(ref_proc_time * 1000.0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5338 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5339 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5340 // Weak Reference processing during an evacuation pause (part 2). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5341 void G1CollectedHeap::enqueue_discovered_references() { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5342 double ref_enq_start = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5343 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5344 ReferenceProcessor* rp = _ref_processor_stw; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5345 assert(!rp->discovery_enabled(), "should have been disabled as part of processing"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5346 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5347 // Now enqueue any remaining on the discovered lists on to |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5348 // the pending list. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5349 if (!rp->processing_is_mt()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5350 // Serial reference processing... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5351 rp->enqueue_discovered_references(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5352 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5353 // Parallel reference enqueuing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5354 |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5355 int active_workers = (ParallelGCThreads > 0 ? workers()->active_workers() : 1); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5356 assert(active_workers == workers()->active_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5357 "Need to reset active_workers"); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5358 assert(rp->num_q() == active_workers, "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5359 assert(active_workers <= rp->max_num_q(), "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5360 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5361 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5362 rp->enqueue_discovered_references(&par_task_executor); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5363 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5364 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5365 rp->verify_no_references_recorded(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5366 assert(!rp->discovery_enabled(), "should have been disabled"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5367 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5368 // FIXME |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5369 // CM's reference processing also cleans up the string and symbol tables. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5370 // Should we do that here also? We could, but it is a serial operation |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5371 // and could signicantly increase the pause time. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5372 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5373 double ref_enq_time = os::elapsedTime() - ref_enq_start; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5374 g1_policy()->record_ref_enq_time(ref_enq_time * 1000.0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5375 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5376 |
| 342 | 5377 void G1CollectedHeap::evacuate_collection_set() { |
| 5378 set_evacuation_failed(false); | |
| 5379 | |
| 5380 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
| 5381 concurrent_g1_refine()->set_use_cache(false); | |
| 889 | 5382 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
| 5383 | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5384 int n_workers; |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5385 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5386 n_workers = |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5387 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5388 workers()->active_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5389 Threads::number_of_non_daemon_threads()); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5390 assert(UseDynamicNumberOfGCThreads || |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5391 n_workers == workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5392 "If not dynamic should be using all the workers"); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5393 set_par_threads(n_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5394 } else { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5395 assert(n_par_threads() == 0, |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5396 "Should be the original non-parallel value"); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5397 n_workers = 1; |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5398 } |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5399 workers()->set_active_workers(n_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5400 |
|
bca17e38de00
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jmasa
parents:
4090
diff
changeset
|
5401 G1ParTask g1_par_task(this, _task_queues); |
| 342 | 5402 |
| 5403 init_for_evac_failure(NULL); | |
| 5404 | |
| 5405 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
|
5406 |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5407 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
| 342 | 5408 double start_par = os::elapsedTime(); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5409 |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
5410 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 5411 // 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
|
5412 StrongRootsScope srs(this); |
| 1709 | 5413 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5414 // These tasks use ShareHeap::_process_strong_tasks |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5415 assert(UseDynamicNumberOfGCThreads || |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5416 workers()->active_workers() == workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5417 "If not dynamic should be using all the workers"); |
| 342 | 5418 workers()->run_task(&g1_par_task); |
| 5419 } else { | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5420 StrongRootsScope srs(this); |
| 342 | 5421 g1_par_task.work(0); |
| 5422 } | |
| 5423 | |
| 5424 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
| 5425 g1_policy()->record_par_time(par_time); | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5426 |
| 342 | 5427 set_par_threads(0); |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5428 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5429 // Process any discovered reference objects - we have |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5430 // to do this _before_ we retire the GC alloc regions |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5431 // as we may have to copy some 'reachable' referent |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5432 // objects (and their reachable sub-graphs) that were |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5433 // not copied during the pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5434 process_discovered_references(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5435 |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5436 // Weak root processing. |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5437 // 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
|
5438 // 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
|
5439 // here too. |
| 342 | 5440 { |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5441 G1STWIsAliveClosure is_alive(this); |
| 342 | 5442 G1KeepAliveClosure keep_alive(this); |
| 5443 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
| 5444 } | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5445 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5446 release_gc_alloc_regions(); |
| 342 | 5447 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5448 |
| 889 | 5449 concurrent_g1_refine()->clear_hot_cache(); |
| 342 | 5450 concurrent_g1_refine()->set_use_cache(true); |
| 5451 | |
| 5452 finalize_for_evac_failure(); | |
| 5453 | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5454 // Must do this before clearing the per-region evac-failure flags |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5455 // (which is currently done when we free the collection set). |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5456 // We also only do this if marking is actually in progress and so |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5457 // have to do this before we set the mark_in_progress flag at the |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5458 // end of an initial mark pause. |
| 342 | 5459 concurrent_mark()->complete_marking_in_collection_set(); |
| 5460 | |
| 5461 if (evacuation_failed()) { | |
| 5462 remove_self_forwarding_pointers(); | |
| 5463 if (PrintGCDetails) { | |
|
1719
b63010841f78
6975964: G1: print out a more descriptive message for evacuation failure when +PrintGCDetails is set
tonyp
parents:
1718
diff
changeset
|
5464 gclog_or_tty->print(" (to-space overflow)"); |
| 342 | 5465 } else if (PrintGC) { |
| 5466 gclog_or_tty->print("--"); | |
| 5467 } | |
| 5468 } | |
| 5469 | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5470 // Enqueue any remaining references remaining on the STW |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5471 // reference processor's discovered lists. We need to do |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5472 // this after the card table is cleaned (and verified) as |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5473 // the act of enqueuing entries on to the pending list |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5474 // will log these updates (and dirty their associated |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5475 // cards). We need these updates logged to update any |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5476 // RSets. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5477 enqueue_discovered_references(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5478 |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5479 if (G1DeferredRSUpdate) { |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5480 RedirtyLoggedCardTableEntryFastClosure redirty; |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5481 dirty_card_queue_set().set_closure(&redirty); |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5482 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
| 1111 | 5483 |
| 5484 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
| 5485 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5486 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
parents:
595
diff
changeset
|
5487 } |
| 342 | 5488 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
| 5489 } | |
| 5490 | |
| 2173 | 5491 void G1CollectedHeap::free_region_if_empty(HeapRegion* hr, |
| 2152 | 5492 size_t* pre_used, |
| 5493 FreeRegionList* free_list, | |
| 4072 | 5494 OldRegionSet* old_proxy_set, |
| 2152 | 5495 HumongousRegionSet* humongous_proxy_set, |
| 2173 | 5496 HRRSCleanupTask* hrrs_cleanup_task, |
| 2152 | 5497 bool par) { |
| 5498 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { | |
| 5499 if (hr->isHumongous()) { | |
| 5500 assert(hr->startsHumongous(), "we should only see starts humongous"); | |
| 5501 free_humongous_region(hr, pre_used, free_list, humongous_proxy_set, par); | |
| 5502 } else { | |
| 4072 | 5503 _old_set.remove_with_proxy(hr, old_proxy_set); |
| 2152 | 5504 free_region(hr, pre_used, free_list, par); |
| 342 | 5505 } |
| 2173 | 5506 } else { |
| 5507 hr->rem_set()->do_cleanup_work(hrrs_cleanup_task); | |
| 342 | 5508 } |
| 5509 } | |
| 5510 | |
| 2152 | 5511 void G1CollectedHeap::free_region(HeapRegion* hr, |
| 5512 size_t* pre_used, | |
| 5513 FreeRegionList* free_list, | |
| 5514 bool par) { | |
| 5515 assert(!hr->isHumongous(), "this is only for non-humongous regions"); | |
| 5516 assert(!hr->is_empty(), "the region should not be empty"); | |
| 5517 assert(free_list != NULL, "pre-condition"); | |
| 5518 | |
| 5519 *pre_used += hr->used(); | |
| 5520 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
|
5521 free_list->add_as_head(hr); |
| 2152 | 5522 } |
| 5523 | |
| 5524 void G1CollectedHeap::free_humongous_region(HeapRegion* hr, | |
| 5525 size_t* pre_used, | |
| 5526 FreeRegionList* free_list, | |
| 5527 HumongousRegionSet* humongous_proxy_set, | |
| 5528 bool par) { | |
| 5529 assert(hr->startsHumongous(), "this is only for starts humongous regions"); | |
| 5530 assert(free_list != NULL, "pre-condition"); | |
| 5531 assert(humongous_proxy_set != NULL, "pre-condition"); | |
| 5532 | |
| 5533 size_t hr_used = hr->used(); | |
| 5534 size_t hr_capacity = hr->capacity(); | |
| 5535 size_t hr_pre_used = 0; | |
| 5536 _humongous_set.remove_with_proxy(hr, humongous_proxy_set); | |
| 5537 hr->set_notHumongous(); | |
| 5538 free_region(hr, &hr_pre_used, free_list, par); | |
| 5539 | |
| 3766 | 5540 size_t i = hr->hrs_index() + 1; |
| 2152 | 5541 size_t num = 1; |
| 3766 | 5542 while (i < n_regions()) { |
| 5543 HeapRegion* curr_hr = region_at(i); | |
| 2152 | 5544 if (!curr_hr->continuesHumongous()) { |
| 5545 break; | |
| 5546 } | |
| 5547 curr_hr->set_notHumongous(); | |
| 5548 free_region(curr_hr, &hr_pre_used, free_list, par); | |
| 5549 num += 1; | |
| 5550 i += 1; | |
| 5551 } | |
| 5552 assert(hr_pre_used == hr_used, | |
| 5553 err_msg("hr_pre_used: "SIZE_FORMAT" and hr_used: "SIZE_FORMAT" " | |
| 5554 "should be the same", hr_pre_used, hr_used)); | |
| 5555 *pre_used += hr_pre_used; | |
| 5556 } | |
| 5557 | |
| 5558 void G1CollectedHeap::update_sets_after_freeing_regions(size_t pre_used, | |
| 5559 FreeRegionList* free_list, | |
| 4072 | 5560 OldRegionSet* old_proxy_set, |
| 2152 | 5561 HumongousRegionSet* humongous_proxy_set, |
| 5562 bool par) { | |
| 5563 if (pre_used > 0) { | |
| 5564 Mutex* lock = (par) ? ParGCRareEvent_lock : NULL; | |
| 342 | 5565 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); |
| 2152 | 5566 assert(_summary_bytes_used >= pre_used, |
| 5567 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" " | |
| 5568 "should be >= pre_used: "SIZE_FORMAT, | |
| 5569 _summary_bytes_used, pre_used)); | |
| 342 | 5570 _summary_bytes_used -= pre_used; |
| 2152 | 5571 } |
| 5572 if (free_list != NULL && !free_list->is_empty()) { | |
| 5573 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); | |
|
2432
455328d90876
7029458: G1: Add newly-reclaimed regions to the beginning of the region free list, not the end
tonyp
parents:
2369
diff
changeset
|
5574 _free_list.add_as_head(free_list); |
| 2152 | 5575 } |
| 4072 | 5576 if (old_proxy_set != NULL && !old_proxy_set->is_empty()) { |
| 5577 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
| 5578 _old_set.update_from_proxy(old_proxy_set); | |
| 5579 } | |
| 2152 | 5580 if (humongous_proxy_set != NULL && !humongous_proxy_set->is_empty()) { |
| 5581 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
| 5582 _humongous_set.update_from_proxy(humongous_proxy_set); | |
| 342 | 5583 } |
| 5584 } | |
| 5585 | |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5586 class G1ParCleanupCTTask : public AbstractGangTask { |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5587 CardTableModRefBS* _ct_bs; |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5588 G1CollectedHeap* _g1h; |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5589 HeapRegion* volatile _su_head; |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5590 public: |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5591 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5592 G1CollectedHeap* g1h) : |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5593 AbstractGangTask("G1 Par Cleanup CT Task"), |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5594 _ct_bs(ct_bs), _g1h(g1h) { } |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5595 |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5596 void work(int i) { |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5597 HeapRegion* r; |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5598 while (r = _g1h->pop_dirty_cards_region()) { |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5599 clear_cards(r); |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5600 } |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5601 } |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5602 |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5603 void clear_cards(HeapRegion* r) { |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5604 // Cards of the survivors should have already been dirtied. |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5605 if (!r->is_survivor()) { |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5606 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5607 } |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5608 } |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5609 }; |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5610 |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5611 #ifndef PRODUCT |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5612 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
5613 G1CollectedHeap* _g1h; |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5614 CardTableModRefBS* _ct_bs; |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5615 public: |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
5616 G1VerifyCardTableCleanup(G1CollectedHeap* g1h, CardTableModRefBS* ct_bs) |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
5617 : _g1h(g1h), _ct_bs(ct_bs) { } |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5618 virtual bool doHeapRegion(HeapRegion* r) { |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5619 if (r->is_survivor()) { |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
5620 _g1h->verify_dirty_region(r); |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5621 } else { |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
5622 _g1h->verify_not_dirty_region(r); |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5623 } |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5624 return false; |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5625 } |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5626 }; |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5627 |
|
3317
063382f9b575
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|
5628 void G1CollectedHeap::verify_not_dirty_region(HeapRegion* hr) { |
|
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7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5629 // All of the region should be clean. |
|
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|
5630 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); |
|
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|
5631 MemRegion mr(hr->bottom(), hr->end()); |
|
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|
5632 ct_bs->verify_not_dirty_region(mr); |
|
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|
5633 } |
|
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|
5634 |
|
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|
5635 void G1CollectedHeap::verify_dirty_region(HeapRegion* hr) { |
|
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|
5636 // We cannot guarantee that [bottom(),end()] is dirty. Threads |
|
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|
5637 // dirty allocated blocks as they allocate them. The thread that |
|
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|
5638 // retires each region and replaces it with a new one will do a |
|
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|
5639 // maximal allocation to fill in [pre_dummy_top(),end()] but will |
|
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|
5640 // not dirty that area (one less thing to have to do while holding |
|
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|
5641 // a lock). So we can only verify that [bottom(),pre_dummy_top()] |
|
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|
5642 // is dirty. |
|
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|
5643 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
|
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|
5644 MemRegion mr(hr->bottom(), hr->pre_dummy_top()); |
|
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|
5645 ct_bs->verify_dirty_region(mr); |
|
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|
5646 } |
|
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|
5647 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
5648 void G1CollectedHeap::verify_dirty_young_list(HeapRegion* head) { |
|
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|
5649 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
|
2433
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|
5650 for (HeapRegion* hr = head; hr != NULL; hr = hr->get_next_young_region()) { |
|
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|
5651 verify_dirty_region(hr); |
|
2433
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|
5652 } |
|
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|
5653 } |
|
abdfc822206f
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|
5654 |
|
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|
5655 void G1CollectedHeap::verify_dirty_young_regions() { |
|
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|
5656 verify_dirty_young_list(_young_list->first_region()); |
|
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|
5657 verify_dirty_young_list(_young_list->first_survivor_region()); |
|
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|
5658 } |
|
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8624da129f0b
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|
5659 #endif |
|
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|
5660 |
| 342 | 5661 void G1CollectedHeap::cleanUpCardTable() { |
| 5662 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
| 5663 double start = os::elapsedTime(); | |
| 5664 | |
| 4023 | 5665 { |
| 5666 // Iterate over the dirty cards region list. | |
| 5667 G1ParCleanupCTTask cleanup_task(ct_bs, this); | |
| 5668 | |
| 5669 if (ParallelGCThreads > 0) { | |
| 5670 set_par_threads(workers()->total_workers()); | |
| 5671 workers()->run_task(&cleanup_task); | |
| 5672 set_par_threads(0); | |
| 5673 } else { | |
| 5674 while (_dirty_cards_region_list) { | |
| 5675 HeapRegion* r = _dirty_cards_region_list; | |
| 5676 cleanup_task.clear_cards(r); | |
| 5677 _dirty_cards_region_list = r->get_next_dirty_cards_region(); | |
| 5678 if (_dirty_cards_region_list == r) { | |
| 5679 // The last region. | |
| 5680 _dirty_cards_region_list = NULL; | |
| 5681 } | |
| 5682 r->set_next_dirty_cards_region(NULL); | |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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|
5683 } |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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diff
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|
5684 } |
| 4023 | 5685 #ifndef PRODUCT |
| 5686 if (G1VerifyCTCleanup || VerifyAfterGC) { | |
| 5687 G1VerifyCardTableCleanup cleanup_verifier(this, ct_bs); | |
| 5688 heap_region_iterate(&cleanup_verifier); | |
| 5689 } | |
| 5690 #endif | |
|
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|
5691 } |
|
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|
5692 |
| 342 | 5693 double elapsed = os::elapsedTime() - start; |
|
3979
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6484982: G1: process references during evacuation pauses
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changeset
|
5694 g1_policy()->record_clear_ct_time(elapsed * 1000.0); |
| 342 | 5695 } |
| 5696 | |
| 5697 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
| 2152 | 5698 size_t pre_used = 0; |
| 5699 FreeRegionList local_free_list("Local List for CSet Freeing"); | |
| 5700 | |
| 342 | 5701 double young_time_ms = 0.0; |
| 5702 double non_young_time_ms = 0.0; | |
| 5703 | |
|
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|
5704 // Since the collection set is a superset of the the young list, |
|
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|
5705 // all we need to do to clear the young list is clear its |
|
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|
5706 // head and length, and unlink any young regions in the code below |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5707 _young_list->clear(); |
|
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|
5708 |
| 342 | 5709 G1CollectorPolicy* policy = g1_policy(); |
| 5710 | |
| 5711 double start_sec = os::elapsedTime(); | |
| 5712 bool non_young = true; | |
| 5713 | |
| 5714 HeapRegion* cur = cs_head; | |
| 5715 int age_bound = -1; | |
| 5716 size_t rs_lengths = 0; | |
| 5717 | |
| 5718 while (cur != NULL) { | |
| 2361 | 5719 assert(!is_on_master_free_list(cur), "sanity"); |
| 342 | 5720 if (non_young) { |
| 5721 if (cur->is_young()) { | |
| 5722 double end_sec = os::elapsedTime(); | |
| 5723 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 5724 non_young_time_ms += elapsed_ms; | |
| 5725 | |
| 5726 start_sec = os::elapsedTime(); | |
| 5727 non_young = false; | |
| 5728 } | |
| 5729 } else { | |
|
4097
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5730 if (!cur->is_young()) { |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5731 double end_sec = os::elapsedTime(); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5732 double elapsed_ms = (end_sec - start_sec) * 1000.0; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5733 young_time_ms += elapsed_ms; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5734 |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5735 start_sec = os::elapsedTime(); |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5736 non_young = true; |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5737 } |
| 342 | 5738 } |
| 5739 | |
| 5740 rs_lengths += cur->rem_set()->occupied(); | |
| 5741 | |
| 5742 HeapRegion* next = cur->next_in_collection_set(); | |
| 5743 assert(cur->in_collection_set(), "bad CS"); | |
| 5744 cur->set_next_in_collection_set(NULL); | |
| 5745 cur->set_in_collection_set(false); | |
| 5746 | |
| 5747 if (cur->is_young()) { | |
| 5748 int index = cur->young_index_in_cset(); | |
|
4090
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7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
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|
5749 assert(index != -1, "invariant"); |
|
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
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|
5750 assert((size_t) index < policy->young_cset_region_length(), "invariant"); |
| 342 | 5751 size_t words_survived = _surviving_young_words[index]; |
| 5752 cur->record_surv_words_in_group(words_survived); | |
|
1394
1316cec51b4d
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|
5753 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
5754 // At this point the we have 'popped' cur from the collection set |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5755 // (linked via next_in_collection_set()) but it is still in the |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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1391
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|
5756 // young list (linked via next_young_region()). Clear the |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5757 // _next_young_region field. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5758 cur->set_next_young_region(NULL); |
| 342 | 5759 } else { |
| 5760 int index = cur->young_index_in_cset(); | |
|
4090
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tonyp
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changeset
|
5761 assert(index == -1, "invariant"); |
| 342 | 5762 } |
| 5763 | |
| 5764 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
| 5765 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
| 5766 "invariant" ); | |
| 5767 | |
| 5768 if (!cur->evacuation_failed()) { | |
|
4097
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5769 MemRegion used_mr = cur->used_region(); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
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|
5770 |
| 342 | 5771 // And the region is empty. |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
4095
diff
changeset
|
5772 assert(!used_mr.is_empty(), "Should not have empty regions in a CS."); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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4095
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|
5773 |
|
dc467e8b2c5e
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diff
changeset
|
5774 // If marking is in progress then clear any objects marked in |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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4095
diff
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|
5775 // the current region. Note mark_in_progress() returns false, |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
changeset
|
5776 // even during an initial mark pause, until the set_marking_started() |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
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|
5777 // call which takes place later in the pause. |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
changeset
|
5778 if (mark_in_progress()) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
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|
5779 assert(!g1_policy()->during_initial_mark_pause(), "sanity"); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
4095
diff
changeset
|
5780 _cm->nextMarkBitMap()->clearRange(used_mr); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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4095
diff
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|
5781 } |
|
dc467e8b2c5e
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4095
diff
changeset
|
5782 |
| 2152 | 5783 free_region(cur, &pre_used, &local_free_list, false /* par */); |
| 342 | 5784 } else { |
| 5785 cur->uninstall_surv_rate_group(); | |
|
4090
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changeset
|
5786 if (cur->is_young()) { |
| 342 | 5787 cur->set_young_index_in_cset(-1); |
|
4090
a88de71c4e3a
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diff
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|
5788 } |
| 342 | 5789 cur->set_not_young(); |
| 5790 cur->set_evacuation_failed(false); | |
| 4072 | 5791 // The region is now considered to be old. |
| 5792 _old_set.add(cur); | |
| 342 | 5793 } |
| 5794 cur = next; | |
| 5795 } | |
| 5796 | |
| 5797 policy->record_max_rs_lengths(rs_lengths); | |
| 5798 policy->cset_regions_freed(); | |
| 5799 | |
| 5800 double end_sec = os::elapsedTime(); | |
| 5801 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5802 |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
changeset
|
5803 if (non_young) { |
| 342 | 5804 non_young_time_ms += elapsed_ms; |
|
4097
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|
5805 } else { |
| 342 | 5806 young_time_ms += elapsed_ms; |
|
4097
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|
5807 } |
| 342 | 5808 |
| 2152 | 5809 update_sets_after_freeing_regions(pre_used, &local_free_list, |
| 4072 | 5810 NULL /* old_proxy_set */, |
| 2152 | 5811 NULL /* humongous_proxy_set */, |
| 5812 false /* par */); | |
| 342 | 5813 policy->record_young_free_cset_time_ms(young_time_ms); |
| 5814 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
| 5815 } | |
| 5816 | |
|
1394
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|
5817 // This routine is similar to the above but does not record |
|
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1391
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|
5818 // any policy statistics or update free lists; we are abandoning |
|
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diff
changeset
|
5819 // the current incremental collection set in preparation of a |
|
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|
5820 // full collection. After the full GC we will start to build up |
|
1316cec51b4d
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diff
changeset
|
5821 // the incremental collection set again. |
|
1316cec51b4d
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diff
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|
5822 // This is only called when we're doing a full collection |
|
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diff
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|
5823 // and is immediately followed by the tearing down of the young list. |
|
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changeset
|
5824 |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5825 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5826 HeapRegion* cur = cs_head; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5827 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5828 while (cur != NULL) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5829 HeapRegion* next = cur->next_in_collection_set(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5830 assert(cur->in_collection_set(), "bad CS"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5831 cur->set_next_in_collection_set(NULL); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5832 cur->set_in_collection_set(false); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5833 cur->set_young_index_in_cset(-1); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5834 cur = next; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5835 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5836 } |
|
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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
|
5837 |
| 2152 | 5838 void G1CollectedHeap::set_free_regions_coming() { |
| 5839 if (G1ConcRegionFreeingVerbose) { | |
| 5840 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
| 5841 "setting free regions coming"); | |
| 5842 } | |
| 5843 | |
| 5844 assert(!free_regions_coming(), "pre-condition"); | |
| 5845 _free_regions_coming = true; | |
| 342 | 5846 } |
| 5847 | |
| 2152 | 5848 void G1CollectedHeap::reset_free_regions_coming() { |
| 5849 { | |
| 5850 assert(free_regions_coming(), "pre-condition"); | |
| 5851 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 5852 _free_regions_coming = false; | |
| 5853 SecondaryFreeList_lock->notify_all(); | |
| 5854 } | |
| 5855 | |
| 5856 if (G1ConcRegionFreeingVerbose) { | |
| 5857 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
| 5858 "reset free regions coming"); | |
| 342 | 5859 } |
| 5860 } | |
| 5861 | |
| 2152 | 5862 void G1CollectedHeap::wait_while_free_regions_coming() { |
| 5863 // Most of the time we won't have to wait, so let's do a quick test | |
| 5864 // first before we take the lock. | |
| 5865 if (!free_regions_coming()) { | |
| 5866 return; | |
| 5867 } | |
| 5868 | |
| 5869 if (G1ConcRegionFreeingVerbose) { | |
| 5870 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
| 5871 "waiting for free regions"); | |
| 342 | 5872 } |
| 5873 | |
| 5874 { | |
| 2152 | 5875 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
| 5876 while (free_regions_coming()) { | |
| 5877 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 342 | 5878 } |
| 2152 | 5879 } |
| 5880 | |
| 5881 if (G1ConcRegionFreeingVerbose) { | |
| 5882 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
| 5883 "done waiting for free regions"); | |
| 5884 } | |
| 342 | 5885 } |
| 5886 | |
| 5887 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
| 5888 assert(heap_lock_held_for_gc(), | |
| 5889 "the heap lock should already be held by or for this thread"); | |
| 5890 _young_list->push_region(hr); | |
| 5891 } | |
| 5892 | |
| 5893 class NoYoungRegionsClosure: public HeapRegionClosure { | |
| 5894 private: | |
| 5895 bool _success; | |
| 5896 public: | |
| 5897 NoYoungRegionsClosure() : _success(true) { } | |
| 5898 bool doHeapRegion(HeapRegion* r) { | |
| 5899 if (r->is_young()) { | |
| 5900 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
| 5901 r->bottom(), r->end()); | |
| 5902 _success = false; | |
| 5903 } | |
| 5904 return false; | |
| 5905 } | |
| 5906 bool success() { return _success; } | |
| 5907 }; | |
| 5908 | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
5909 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
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parents:
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diff
changeset
|
5910 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
|
5911 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5912 if (check_heap) { |
| 342 | 5913 NoYoungRegionsClosure closure; |
| 5914 heap_region_iterate(&closure); | |
| 5915 ret = ret && closure.success(); | |
| 5916 } | |
| 5917 | |
| 5918 return ret; | |
| 5919 } | |
| 5920 | |
| 4072 | 5921 class TearDownRegionSetsClosure : public HeapRegionClosure { |
| 5922 private: | |
| 5923 OldRegionSet *_old_set; | |
| 2152 | 5924 |
| 342 | 5925 public: |
| 4072 | 5926 TearDownRegionSetsClosure(OldRegionSet* old_set) : _old_set(old_set) { } |
| 2152 | 5927 |
| 342 | 5928 bool doHeapRegion(HeapRegion* r) { |
| 4072 | 5929 if (r->is_empty()) { |
| 5930 // We ignore empty regions, we'll empty the free list afterwards | |
| 5931 } else if (r->is_young()) { | |
| 5932 // We ignore young regions, we'll empty the young list afterwards | |
| 5933 } else if (r->isHumongous()) { | |
| 5934 // We ignore humongous regions, we're not tearing down the | |
| 5935 // humongous region set | |
| 342 | 5936 } else { |
| 4072 | 5937 // The rest should be old |
| 5938 _old_set->remove(r); | |
| 342 | 5939 } |
| 5940 return false; | |
| 5941 } | |
| 5942 | |
| 4072 | 5943 ~TearDownRegionSetsClosure() { |
| 5944 assert(_old_set->is_empty(), "post-condition"); | |
| 2152 | 5945 } |
| 342 | 5946 }; |
| 5947 | |
| 4072 | 5948 void G1CollectedHeap::tear_down_region_sets(bool free_list_only) { |
| 5949 assert_at_safepoint(true /* should_be_vm_thread */); | |
| 5950 | |
| 5951 if (!free_list_only) { | |
| 5952 TearDownRegionSetsClosure cl(&_old_set); | |
| 5953 heap_region_iterate(&cl); | |
| 5954 | |
| 5955 // Need to do this after the heap iteration to be able to | |
| 5956 // recognize the young regions and ignore them during the iteration. | |
| 5957 _young_list->empty_list(); | |
| 5958 } | |
| 5959 _free_list.remove_all(); | |
| 5960 } | |
| 5961 | |
| 5962 class RebuildRegionSetsClosure : public HeapRegionClosure { | |
| 5963 private: | |
| 5964 bool _free_list_only; | |
| 5965 OldRegionSet* _old_set; | |
| 5966 FreeRegionList* _free_list; | |
| 5967 size_t _total_used; | |
| 5968 | |
| 5969 public: | |
| 5970 RebuildRegionSetsClosure(bool free_list_only, | |
| 5971 OldRegionSet* old_set, FreeRegionList* free_list) : | |
| 5972 _free_list_only(free_list_only), | |
| 5973 _old_set(old_set), _free_list(free_list), _total_used(0) { | |
| 5974 assert(_free_list->is_empty(), "pre-condition"); | |
| 5975 if (!free_list_only) { | |
| 5976 assert(_old_set->is_empty(), "pre-condition"); | |
| 5977 } | |
| 5978 } | |
| 5979 | |
| 5980 bool doHeapRegion(HeapRegion* r) { | |
| 5981 if (r->continuesHumongous()) { | |
| 5982 return false; | |
| 5983 } | |
| 5984 | |
| 5985 if (r->is_empty()) { | |
| 5986 // Add free regions to the free list | |
| 5987 _free_list->add_as_tail(r); | |
| 5988 } else if (!_free_list_only) { | |
| 5989 assert(!r->is_young(), "we should not come across young regions"); | |
| 5990 | |
| 5991 if (r->isHumongous()) { | |
| 5992 // We ignore humongous regions, we left the humongous set unchanged | |
| 5993 } else { | |
| 5994 // The rest should be old, add them to the old set | |
| 5995 _old_set->add(r); | |
| 5996 } | |
| 5997 _total_used += r->used(); | |
| 5998 } | |
| 5999 | |
| 6000 return false; | |
| 6001 } | |
| 6002 | |
| 6003 size_t total_used() { | |
| 6004 return _total_used; | |
| 6005 } | |
| 6006 }; | |
| 6007 | |
| 6008 void G1CollectedHeap::rebuild_region_sets(bool free_list_only) { | |
| 6009 assert_at_safepoint(true /* should_be_vm_thread */); | |
| 6010 | |
| 6011 RebuildRegionSetsClosure cl(free_list_only, &_old_set, &_free_list); | |
| 6012 heap_region_iterate(&cl); | |
| 6013 | |
| 6014 if (!free_list_only) { | |
| 6015 _summary_bytes_used = cl.total_used(); | |
| 6016 } | |
| 6017 assert(_summary_bytes_used == recalculate_used(), | |
| 6018 err_msg("inconsistent _summary_bytes_used, " | |
| 6019 "value: "SIZE_FORMAT" recalculated: "SIZE_FORMAT, | |
| 6020 _summary_bytes_used, recalculate_used())); | |
| 342 | 6021 } |
| 6022 | |
| 6023 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
| 6024 _refine_cte_cl->set_concurrent(concurrent); | |
| 6025 } | |
| 6026 | |
| 6027 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
| 6028 HeapRegion* hr = heap_region_containing(p); | |
| 6029 if (hr == NULL) { | |
| 6030 return is_in_permanent(p); | |
| 6031 } else { | |
| 6032 return hr->is_in(p); | |
| 6033 } | |
| 6034 } | |
| 2152 | 6035 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6036 // 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
|
6037 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6038 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
|
6039 bool force) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6040 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
|
6041 assert(!force || g1_policy()->can_expand_young_list(), |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6042 "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
|
6043 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
|
6044 if (force || !young_list_full) { |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6045 HeapRegion* new_alloc_region = new_region(word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6046 false /* do_expand */); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6047 if (new_alloc_region != NULL) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6048 set_region_short_lived_locked(new_alloc_region); |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
6049 _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
|
6050 return new_alloc_region; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6051 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6052 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6053 return NULL; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6054 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6055 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6056 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
|
6057 size_t allocated_bytes) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6058 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
|
6059 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
|
6060 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6061 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
|
6062 _summary_bytes_used += allocated_bytes; |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
6063 _hr_printer.retire(alloc_region); |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
6064 // 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
|
6065 // 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
|
6066 // used space has been recored in _summary_bytes_used. |
|
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
6067 g1mm()->update_eden_size(); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6068 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6069 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6070 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
|
6071 bool force) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6072 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
|
6073 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6074 |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6075 void G1CollectedHeap::set_par_threads() { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6076 // Don't change the number of workers. Use the value previously set |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6077 // in the workgroup. |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6078 int n_workers = workers()->active_workers(); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6079 assert(UseDynamicNumberOfGCThreads || |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6080 n_workers == workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6081 "Otherwise should be using the total number of workers"); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6082 if (n_workers == 0) { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6083 assert(false, "Should have been set in prior evacuation pause."); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6084 n_workers = ParallelGCThreads; |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6085 workers()->set_active_workers(n_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6086 } |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6087 set_par_threads(n_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6088 } |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6089 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6090 void MutatorAllocRegion::retire_region(HeapRegion* alloc_region, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6091 size_t allocated_bytes) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6092 _g1h->retire_mutator_alloc_region(alloc_region, allocated_bytes); |
|
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6093 } |
|
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6094 |
|
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6095 // Methods for the GC alloc regions |
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6096 |
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6097 HeapRegion* G1CollectedHeap::new_gc_alloc_region(size_t word_size, |
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6098 size_t count, |
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6099 GCAllocPurpose ap) { |
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6100 assert(FreeList_lock->owned_by_self(), "pre-condition"); |
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6101 |
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6102 if (count < g1_policy()->max_regions(ap)) { |
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6103 HeapRegion* new_alloc_region = new_region(word_size, |
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6104 true /* do_expand */); |
|
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6105 if (new_alloc_region != NULL) { |
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6106 // We really only need to do this for old regions given that we |
|
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6107 // should never scan survivors. But it doesn't hurt to do it |
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6108 // for survivors too. |
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6109 new_alloc_region->set_saved_mark(); |
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6110 if (ap == GCAllocForSurvived) { |
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6111 new_alloc_region->set_survivor(); |
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6112 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Survivor); |
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6113 } else { |
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6114 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Old); |
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6115 } |
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6116 return new_alloc_region; |
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6117 } else { |
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6118 g1_policy()->note_alloc_region_limit_reached(ap); |
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6119 } |
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6120 } |
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6121 return NULL; |
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6122 } |
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6123 |
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6124 void G1CollectedHeap::retire_gc_alloc_region(HeapRegion* alloc_region, |
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6125 size_t allocated_bytes, |
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6126 GCAllocPurpose ap) { |
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6127 alloc_region->note_end_of_copying(); |
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6128 g1_policy()->record_bytes_copied_during_gc(allocated_bytes); |
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6129 if (ap == GCAllocForSurvived) { |
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6130 young_list()->add_survivor_region(alloc_region); |
| 4072 | 6131 } else { |
| 6132 _old_set.add(alloc_region); | |
|
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6133 } |
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6134 _hr_printer.retire(alloc_region); |
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6135 } |
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6136 |
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6137 HeapRegion* SurvivorGCAllocRegion::allocate_new_region(size_t word_size, |
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6138 bool force) { |
|
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6139 assert(!force, "not supported for GC alloc regions"); |
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6140 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForSurvived); |
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6141 } |
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6142 |
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6143 void SurvivorGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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6144 size_t allocated_bytes) { |
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6145 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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6146 GCAllocForSurvived); |
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6147 } |
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6148 |
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6149 HeapRegion* OldGCAllocRegion::allocate_new_region(size_t word_size, |
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6150 bool force) { |
|
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6151 assert(!force, "not supported for GC alloc regions"); |
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6152 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForTenured); |
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|
6153 } |
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6154 |
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6155 void OldGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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6156 size_t allocated_bytes) { |
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6157 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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6158 GCAllocForTenured); |
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6159 } |
|
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6160 // Heap region set verification |
|
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6161 |
| 2152 | 6162 class VerifyRegionListsClosure : public HeapRegionClosure { |
| 6163 private: | |
| 4072 | 6164 FreeRegionList* _free_list; |
| 6165 OldRegionSet* _old_set; | |
| 2152 | 6166 HumongousRegionSet* _humongous_set; |
| 6167 size_t _region_count; | |
| 6168 | |
| 6169 public: | |
| 4072 | 6170 VerifyRegionListsClosure(OldRegionSet* old_set, |
| 6171 HumongousRegionSet* humongous_set, | |
| 2152 | 6172 FreeRegionList* free_list) : |
| 4072 | 6173 _old_set(old_set), _humongous_set(humongous_set), |
| 6174 _free_list(free_list), _region_count(0) { } | |
| 2152 | 6175 |
| 6176 size_t region_count() { return _region_count; } | |
| 6177 | |
| 6178 bool doHeapRegion(HeapRegion* hr) { | |
| 6179 _region_count += 1; | |
| 6180 | |
| 6181 if (hr->continuesHumongous()) { | |
| 6182 return false; | |
| 6183 } | |
| 6184 | |
| 6185 if (hr->is_young()) { | |
| 6186 // TODO | |
| 6187 } else if (hr->startsHumongous()) { | |
| 6188 _humongous_set->verify_next_region(hr); | |
| 6189 } else if (hr->is_empty()) { | |
| 6190 _free_list->verify_next_region(hr); | |
| 4072 | 6191 } else { |
| 6192 _old_set->verify_next_region(hr); | |
| 2152 | 6193 } |
| 6194 return false; | |
| 6195 } | |
| 6196 }; | |
| 6197 | |
| 3766 | 6198 HeapRegion* G1CollectedHeap::new_heap_region(size_t hrs_index, |
| 6199 HeapWord* bottom) { | |
| 6200 HeapWord* end = bottom + HeapRegion::GrainWords; | |
| 6201 MemRegion mr(bottom, end); | |
| 6202 assert(_g1_reserved.contains(mr), "invariant"); | |
| 6203 // This might return NULL if the allocation fails | |
| 6204 return new HeapRegion(hrs_index, _bot_shared, mr, true /* is_zeroed */); | |
| 6205 } | |
| 6206 | |
| 2152 | 6207 void G1CollectedHeap::verify_region_sets() { |
| 6208 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); | |
| 6209 | |
| 6210 // First, check the explicit lists. | |
| 6211 _free_list.verify(); | |
| 6212 { | |
| 6213 // Given that a concurrent operation might be adding regions to | |
| 6214 // the secondary free list we have to take the lock before | |
| 6215 // verifying it. | |
| 6216 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 6217 _secondary_free_list.verify(); | |
| 6218 } | |
| 4072 | 6219 _old_set.verify(); |
| 2152 | 6220 _humongous_set.verify(); |
| 6221 | |
| 6222 // If a concurrent region freeing operation is in progress it will | |
| 6223 // be difficult to correctly attributed any free regions we come | |
| 6224 // across to the correct free list given that they might belong to | |
| 6225 // one of several (free_list, secondary_free_list, any local lists, | |
| 6226 // etc.). So, if that's the case we will skip the rest of the | |
| 6227 // verification operation. Alternatively, waiting for the concurrent | |
| 6228 // operation to complete will have a non-trivial effect on the GC's | |
| 6229 // operation (no concurrent operation will last longer than the | |
| 6230 // interval between two calls to verification) and it might hide | |
| 6231 // any issues that we would like to catch during testing. | |
| 6232 if (free_regions_coming()) { | |
| 6233 return; | |
| 6234 } | |
| 6235 | |
| 2361 | 6236 // Make sure we append the secondary_free_list on the free_list so |
| 6237 // that all free regions we will come across can be safely | |
| 6238 // attributed to the free_list. | |
| 6239 append_secondary_free_list_if_not_empty_with_lock(); | |
| 2152 | 6240 |
| 6241 // Finally, make sure that the region accounting in the lists is | |
| 6242 // consistent with what we see in the heap. | |
| 4072 | 6243 _old_set.verify_start(); |
| 2152 | 6244 _humongous_set.verify_start(); |
| 6245 _free_list.verify_start(); | |
| 6246 | |
| 4072 | 6247 VerifyRegionListsClosure cl(&_old_set, &_humongous_set, &_free_list); |
| 2152 | 6248 heap_region_iterate(&cl); |
| 6249 | |
| 4072 | 6250 _old_set.verify_end(); |
| 2152 | 6251 _humongous_set.verify_end(); |
| 6252 _free_list.verify_end(); | |
| 342 | 6253 } |