Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 4787:2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
Summary: This change simplifies the interaction between GC and concurrent marking. By disabling survivor spaces during the initial-mark pause we don't need to propagate marks of objects we copy during each GC (since we never need to copy an explicitly marked object).
Reviewed-by: johnc, brutisso
| author | tonyp |
|---|---|
| date | Tue, 10 Jan 2012 18:58:13 -0500 |
| parents | 97c00e21fecb |
| children | 9509c20bba28 aa3d708d67c4 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2012, 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" |
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35 #include "gc_implementation/g1/g1EvacFailure.hpp" |
| 1972 | 36 #include "gc_implementation/g1/g1MarkSweep.hpp" |
| 37 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
| 38 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
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39 #include "gc_implementation/g1/heapRegion.inline.hpp" |
| 1972 | 40 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
| 41 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
| 42 #include "gc_implementation/g1/vm_operations_g1.hpp" | |
| 43 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
| 44 #include "memory/gcLocker.inline.hpp" | |
| 45 #include "memory/genOopClosures.inline.hpp" | |
| 46 #include "memory/generationSpec.hpp" | |
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47 #include "memory/referenceProcessor.hpp" |
| 1972 | 48 #include "oops/oop.inline.hpp" |
| 49 #include "oops/oop.pcgc.inline.hpp" | |
| 50 #include "runtime/aprofiler.hpp" | |
| 51 #include "runtime/vmThread.hpp" | |
| 342 | 52 |
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53 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0; |
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54 |
| 342 | 55 // turn it on so that the contents of the young list (scan-only / |
| 56 // to-be-collected) are printed at "strategic" points before / during | |
| 57 // / after the collection --- this is useful for debugging | |
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58 #define YOUNG_LIST_VERBOSE 0 |
| 342 | 59 // CURRENT STATUS |
| 60 // This file is under construction. Search for "FIXME". | |
| 61 | |
| 62 // INVARIANTS/NOTES | |
| 63 // | |
| 64 // All allocation activity covered by the G1CollectedHeap interface is | |
| 1973 | 65 // serialized by acquiring the HeapLock. This happens in mem_allocate |
| 66 // and allocate_new_tlab, which are the "entry" points to the | |
| 67 // allocation code from the rest of the JVM. (Note that this does not | |
| 68 // apply to TLAB allocation, which is not part of this interface: it | |
| 69 // is done by clients of this interface.) | |
| 342 | 70 |
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71 // Notes on implementation of parallelism in different tasks. |
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72 // |
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73 // G1ParVerifyTask uses heap_region_par_iterate_chunked() for parallelism. |
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74 // The number of GC workers is passed to heap_region_par_iterate_chunked(). |
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75 // It does use run_task() which sets _n_workers in the task. |
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76 // G1ParTask executes g1_process_strong_roots() -> |
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77 // SharedHeap::process_strong_roots() which calls eventuall to |
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78 // CardTableModRefBS::par_non_clean_card_iterate_work() which uses |
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79 // SequentialSubTasksDone. SharedHeap::process_strong_roots() also |
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80 // directly uses SubTasksDone (_process_strong_tasks field in SharedHeap). |
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81 // |
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82 |
| 342 | 83 // Local to this file. |
| 84 | |
| 85 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
| 86 SuspendibleThreadSet* _sts; | |
| 87 G1RemSet* _g1rs; | |
| 88 ConcurrentG1Refine* _cg1r; | |
| 89 bool _concurrent; | |
| 90 public: | |
| 91 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
| 92 G1RemSet* g1rs, | |
| 93 ConcurrentG1Refine* cg1r) : | |
| 94 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
| 95 {} | |
| 96 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 1705 | 97 bool oops_into_cset = _g1rs->concurrentRefineOneCard(card_ptr, worker_i, false); |
| 98 // This path is executed by the concurrent refine or mutator threads, | |
| 99 // concurrently, and so we do not care if card_ptr contains references | |
| 100 // that point into the collection set. | |
| 101 assert(!oops_into_cset, "should be"); | |
| 102 | |
| 342 | 103 if (_concurrent && _sts->should_yield()) { |
| 104 // Caller will actually yield. | |
| 105 return false; | |
| 106 } | |
| 107 // Otherwise, we finished successfully; return true. | |
| 108 return true; | |
| 109 } | |
| 110 void set_concurrent(bool b) { _concurrent = b; } | |
| 111 }; | |
| 112 | |
| 113 | |
| 114 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 115 int _calls; | |
| 116 G1CollectedHeap* _g1h; | |
| 117 CardTableModRefBS* _ctbs; | |
| 118 int _histo[256]; | |
| 119 public: | |
| 120 ClearLoggedCardTableEntryClosure() : | |
| 121 _calls(0) | |
| 122 { | |
| 123 _g1h = G1CollectedHeap::heap(); | |
| 124 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 125 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
| 126 } | |
| 127 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 128 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 129 _calls++; | |
| 130 unsigned char* ujb = (unsigned char*)card_ptr; | |
| 131 int ind = (int)(*ujb); | |
| 132 _histo[ind]++; | |
| 133 *card_ptr = -1; | |
| 134 } | |
| 135 return true; | |
| 136 } | |
| 137 int calls() { return _calls; } | |
| 138 void print_histo() { | |
| 139 gclog_or_tty->print_cr("Card table value histogram:"); | |
| 140 for (int i = 0; i < 256; i++) { | |
| 141 if (_histo[i] != 0) { | |
| 142 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
| 143 } | |
| 144 } | |
| 145 } | |
| 146 }; | |
| 147 | |
| 148 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 149 int _calls; | |
| 150 G1CollectedHeap* _g1h; | |
| 151 CardTableModRefBS* _ctbs; | |
| 152 public: | |
| 153 RedirtyLoggedCardTableEntryClosure() : | |
| 154 _calls(0) | |
| 155 { | |
| 156 _g1h = G1CollectedHeap::heap(); | |
| 157 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 158 } | |
| 159 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 160 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 161 _calls++; | |
| 162 *card_ptr = 0; | |
| 163 } | |
| 164 return true; | |
| 165 } | |
| 166 int calls() { return _calls; } | |
| 167 }; | |
| 168 | |
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169 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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170 public: |
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171 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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172 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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173 return true; |
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174 } |
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175 }; |
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176 |
| 342 | 177 YoungList::YoungList(G1CollectedHeap* g1h) |
| 178 : _g1h(g1h), _head(NULL), | |
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179 _length(0), |
| 342 | 180 _last_sampled_rs_lengths(0), |
| 545 | 181 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) |
| 342 | 182 { |
| 183 guarantee( check_list_empty(false), "just making sure..." ); | |
| 184 } | |
| 185 | |
| 186 void YoungList::push_region(HeapRegion *hr) { | |
| 187 assert(!hr->is_young(), "should not already be young"); | |
| 188 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
| 189 | |
| 190 hr->set_next_young_region(_head); | |
| 191 _head = hr; | |
| 192 | |
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193 _g1h->g1_policy()->set_region_eden(hr, (int) _length); |
| 342 | 194 ++_length; |
| 195 } | |
| 196 | |
| 197 void YoungList::add_survivor_region(HeapRegion* hr) { | |
| 545 | 198 assert(hr->is_survivor(), "should be flagged as survivor region"); |
| 342 | 199 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
| 200 | |
| 201 hr->set_next_young_region(_survivor_head); | |
| 202 if (_survivor_head == NULL) { | |
| 545 | 203 _survivor_tail = hr; |
| 342 | 204 } |
| 205 _survivor_head = hr; | |
| 206 ++_survivor_length; | |
| 207 } | |
| 208 | |
| 209 void YoungList::empty_list(HeapRegion* list) { | |
| 210 while (list != NULL) { | |
| 211 HeapRegion* next = list->get_next_young_region(); | |
| 212 list->set_next_young_region(NULL); | |
| 213 list->uninstall_surv_rate_group(); | |
| 214 list->set_not_young(); | |
| 215 list = next; | |
| 216 } | |
| 217 } | |
| 218 | |
| 219 void YoungList::empty_list() { | |
| 220 assert(check_list_well_formed(), "young list should be well formed"); | |
| 221 | |
| 222 empty_list(_head); | |
| 223 _head = NULL; | |
| 224 _length = 0; | |
| 225 | |
| 226 empty_list(_survivor_head); | |
| 227 _survivor_head = NULL; | |
| 545 | 228 _survivor_tail = NULL; |
| 342 | 229 _survivor_length = 0; |
| 230 | |
| 231 _last_sampled_rs_lengths = 0; | |
| 232 | |
| 233 assert(check_list_empty(false), "just making sure..."); | |
| 234 } | |
| 235 | |
| 236 bool YoungList::check_list_well_formed() { | |
| 237 bool ret = true; | |
| 238 | |
| 239 size_t length = 0; | |
| 240 HeapRegion* curr = _head; | |
| 241 HeapRegion* last = NULL; | |
| 242 while (curr != NULL) { | |
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243 if (!curr->is_young()) { |
| 342 | 244 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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245 "incorrectly tagged (y: %d, surv: %d)", |
| 342 | 246 curr->bottom(), curr->end(), |
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247 curr->is_young(), curr->is_survivor()); |
| 342 | 248 ret = false; |
| 249 } | |
| 250 ++length; | |
| 251 last = curr; | |
| 252 curr = curr->get_next_young_region(); | |
| 253 } | |
| 254 ret = ret && (length == _length); | |
| 255 | |
| 256 if (!ret) { | |
| 257 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
| 258 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
| 259 length, _length); | |
| 260 } | |
| 261 | |
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262 return ret; |
| 342 | 263 } |
| 264 | |
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265 bool YoungList::check_list_empty(bool check_sample) { |
| 342 | 266 bool ret = true; |
| 267 | |
| 268 if (_length != 0) { | |
| 269 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
| 270 _length); | |
| 271 ret = false; | |
| 272 } | |
| 273 if (check_sample && _last_sampled_rs_lengths != 0) { | |
| 274 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
| 275 ret = false; | |
| 276 } | |
| 277 if (_head != NULL) { | |
| 278 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
| 279 ret = false; | |
| 280 } | |
| 281 if (!ret) { | |
| 282 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
| 283 } | |
| 284 | |
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285 return ret; |
| 342 | 286 } |
| 287 | |
| 288 void | |
| 289 YoungList::rs_length_sampling_init() { | |
| 290 _sampled_rs_lengths = 0; | |
| 291 _curr = _head; | |
| 292 } | |
| 293 | |
| 294 bool | |
| 295 YoungList::rs_length_sampling_more() { | |
| 296 return _curr != NULL; | |
| 297 } | |
| 298 | |
| 299 void | |
| 300 YoungList::rs_length_sampling_next() { | |
| 301 assert( _curr != NULL, "invariant" ); | |
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302 size_t rs_length = _curr->rem_set()->occupied(); |
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303 |
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304 _sampled_rs_lengths += rs_length; |
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305 |
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306 // The current region may not yet have been added to the |
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307 // incremental collection set (it gets added when it is |
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308 // retired as the current allocation region). |
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309 if (_curr->in_collection_set()) { |
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310 // Update the collection set policy information for this region |
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311 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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312 } |
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313 |
| 342 | 314 _curr = _curr->get_next_young_region(); |
| 315 if (_curr == NULL) { | |
| 316 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
| 317 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
| 318 } | |
| 319 } | |
| 320 | |
| 321 void | |
| 322 YoungList::reset_auxilary_lists() { | |
| 323 guarantee( is_empty(), "young list should be empty" ); | |
| 324 assert(check_list_well_formed(), "young list should be well formed"); | |
| 325 | |
| 326 // Add survivor regions to SurvRateGroup. | |
| 327 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
| 545 | 328 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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329 |
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330 int young_index_in_cset = 0; |
| 342 | 331 for (HeapRegion* curr = _survivor_head; |
| 332 curr != NULL; | |
| 333 curr = curr->get_next_young_region()) { | |
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334 _g1h->g1_policy()->set_region_survivor(curr, young_index_in_cset); |
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335 |
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336 // The region is a non-empty survivor so let's add it to |
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337 // the incremental collection set for the next evacuation |
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338 // pause. |
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339 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
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340 young_index_in_cset += 1; |
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341 } |
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342 assert((size_t) young_index_in_cset == _survivor_length, |
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343 "post-condition"); |
| 342 | 344 _g1h->g1_policy()->note_stop_adding_survivor_regions(); |
| 345 | |
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346 _head = _survivor_head; |
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347 _length = _survivor_length; |
| 342 | 348 if (_survivor_head != NULL) { |
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349 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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350 assert(_survivor_length > 0, "invariant"); |
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351 _survivor_tail->set_next_young_region(NULL); |
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352 } |
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353 |
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354 // Don't clear the survivor list handles until the start of |
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355 // the next evacuation pause - we need it in order to re-tag |
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356 // the survivor regions from this evacuation pause as 'young' |
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357 // at the start of the next. |
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358 |
| 545 | 359 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
| 342 | 360 |
| 361 assert(check_list_well_formed(), "young list should be well formed"); | |
| 362 } | |
| 363 | |
| 364 void YoungList::print() { | |
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365 HeapRegion* lists[] = {_head, _survivor_head}; |
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366 const char* names[] = {"YOUNG", "SURVIVOR"}; |
| 342 | 367 |
| 368 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
| 369 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
| 370 HeapRegion *curr = lists[list]; | |
| 371 if (curr == NULL) | |
| 372 gclog_or_tty->print_cr(" empty"); | |
| 373 while (curr != NULL) { | |
| 374 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
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375 "age: %4d, y: %d, surv: %d", |
| 342 | 376 curr->bottom(), curr->end(), |
| 377 curr->top(), | |
| 378 curr->prev_top_at_mark_start(), | |
| 379 curr->next_top_at_mark_start(), | |
| 380 curr->top_at_conc_mark_count(), | |
| 381 curr->age_in_surv_rate_group_cond(), | |
| 382 curr->is_young(), | |
| 383 curr->is_survivor()); | |
| 384 curr = curr->get_next_young_region(); | |
| 385 } | |
| 386 } | |
| 387 | |
| 388 gclog_or_tty->print_cr(""); | |
| 389 } | |
| 390 | |
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391 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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392 { |
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393 // Claim the right to put the region on the dirty cards region list |
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394 // by installing a self pointer. |
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395 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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396 if (next == NULL) { |
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397 HeapRegion* res = (HeapRegion*) |
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398 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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399 NULL); |
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400 if (res == NULL) { |
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401 HeapRegion* head; |
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402 do { |
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403 // Put the region to the dirty cards region list. |
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404 head = _dirty_cards_region_list; |
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405 next = (HeapRegion*) |
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406 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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407 if (next == head) { |
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408 assert(hr->get_next_dirty_cards_region() == hr, |
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409 "hr->get_next_dirty_cards_region() != hr"); |
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410 if (next == NULL) { |
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411 // The last region in the list points to itself. |
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412 hr->set_next_dirty_cards_region(hr); |
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413 } else { |
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414 hr->set_next_dirty_cards_region(next); |
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415 } |
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416 } |
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417 } while (next != head); |
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418 } |
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419 } |
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420 } |
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421 |
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422 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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423 { |
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424 HeapRegion* head; |
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425 HeapRegion* hr; |
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426 do { |
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427 head = _dirty_cards_region_list; |
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428 if (head == NULL) { |
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429 return NULL; |
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430 } |
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431 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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432 if (head == new_head) { |
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433 // The last region. |
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434 new_head = NULL; |
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435 } |
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436 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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437 head); |
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438 } while (hr != head); |
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439 assert(hr != NULL, "invariant"); |
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440 hr->set_next_dirty_cards_region(NULL); |
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441 return hr; |
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442 } |
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443 |
| 342 | 444 void G1CollectedHeap::stop_conc_gc_threads() { |
| 794 | 445 _cg1r->stop(); |
| 342 | 446 _cmThread->stop(); |
| 447 } | |
| 448 | |
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449 #ifdef ASSERT |
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450 // A region is added to the collection set as it is retired |
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451 // so an address p can point to a region which will be in the |
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452 // collection set but has not yet been retired. This method |
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453 // therefore is only accurate during a GC pause after all |
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454 // regions have been retired. It is used for debugging |
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455 // to check if an nmethod has references to objects that can |
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456 // be move during a partial collection. Though it can be |
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457 // inaccurate, it is sufficient for G1 because the conservative |
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458 // implementation of is_scavengable() for G1 will indicate that |
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459 // all nmethods must be scanned during a partial collection. |
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460 bool G1CollectedHeap::is_in_partial_collection(const void* p) { |
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461 HeapRegion* hr = heap_region_containing(p); |
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462 return hr != NULL && hr->in_collection_set(); |
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463 } |
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464 #endif |
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465 |
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466 // Returns true if the reference points to an object that |
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467 // can move in an incremental collecction. |
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468 bool G1CollectedHeap::is_scavengable(const void* p) { |
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469 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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470 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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471 HeapRegion* hr = heap_region_containing(p); |
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472 if (hr == NULL) { |
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473 // perm gen (or null) |
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474 return false; |
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475 } else { |
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476 return !hr->isHumongous(); |
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477 } |
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478 } |
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479 |
| 342 | 480 void G1CollectedHeap::check_ct_logs_at_safepoint() { |
| 481 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 482 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
| 483 | |
| 484 // Count the dirty cards at the start. | |
| 485 CountNonCleanMemRegionClosure count1(this); | |
| 486 ct_bs->mod_card_iterate(&count1); | |
| 487 int orig_count = count1.n(); | |
| 488 | |
| 489 // First clear the logged cards. | |
| 490 ClearLoggedCardTableEntryClosure clear; | |
| 491 dcqs.set_closure(&clear); | |
| 492 dcqs.apply_closure_to_all_completed_buffers(); | |
| 493 dcqs.iterate_closure_all_threads(false); | |
| 494 clear.print_histo(); | |
| 495 | |
| 496 // Now ensure that there's no dirty cards. | |
| 497 CountNonCleanMemRegionClosure count2(this); | |
| 498 ct_bs->mod_card_iterate(&count2); | |
| 499 if (count2.n() != 0) { | |
| 500 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
| 501 count2.n(), orig_count); | |
| 502 } | |
| 503 guarantee(count2.n() == 0, "Card table should be clean."); | |
| 504 | |
| 505 RedirtyLoggedCardTableEntryClosure redirty; | |
| 506 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
| 507 dcqs.apply_closure_to_all_completed_buffers(); | |
| 508 dcqs.iterate_closure_all_threads(false); | |
| 509 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
| 510 clear.calls(), orig_count); | |
| 511 guarantee(redirty.calls() == clear.calls(), | |
| 512 "Or else mechanism is broken."); | |
| 513 | |
| 514 CountNonCleanMemRegionClosure count3(this); | |
| 515 ct_bs->mod_card_iterate(&count3); | |
| 516 if (count3.n() != orig_count) { | |
| 517 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
| 518 orig_count, count3.n()); | |
| 519 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
| 520 } | |
| 521 | |
| 522 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 523 } | |
| 524 | |
| 525 // Private class members. | |
| 526 | |
| 527 G1CollectedHeap* G1CollectedHeap::_g1h; | |
| 528 | |
| 529 // Private methods. | |
| 530 | |
| 2152 | 531 HeapRegion* |
| 2361 | 532 G1CollectedHeap::new_region_try_secondary_free_list() { |
| 2152 | 533 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
| 534 while (!_secondary_free_list.is_empty() || free_regions_coming()) { | |
| 535 if (!_secondary_free_list.is_empty()) { | |
| 536 if (G1ConcRegionFreeingVerbose) { | |
| 537 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 538 "secondary_free_list has "SIZE_FORMAT" entries", | |
| 539 _secondary_free_list.length()); | |
| 540 } | |
| 541 // It looks as if there are free regions available on the | |
| 542 // secondary_free_list. Let's move them to the free_list and try | |
| 543 // again to allocate from it. | |
| 544 append_secondary_free_list(); | |
| 545 | |
| 546 assert(!_free_list.is_empty(), "if the secondary_free_list was not " | |
| 547 "empty we should have moved at least one entry to the free_list"); | |
| 548 HeapRegion* res = _free_list.remove_head(); | |
| 549 if (G1ConcRegionFreeingVerbose) { | |
| 550 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 551 "allocated "HR_FORMAT" from secondary_free_list", | |
| 552 HR_FORMAT_PARAMS(res)); | |
| 553 } | |
| 554 return res; | |
| 555 } | |
| 556 | |
| 557 // Wait here until we get notifed either when (a) there are no | |
| 558 // more free regions coming or (b) some regions have been moved on | |
| 559 // the secondary_free_list. | |
| 560 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 561 } | |
| 562 | |
| 563 if (G1ConcRegionFreeingVerbose) { | |
| 564 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 565 "could not allocate from secondary_free_list"); | |
| 566 } | |
| 567 return NULL; | |
| 568 } | |
| 569 | |
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570 HeapRegion* G1CollectedHeap::new_region(size_t word_size, bool do_expand) { |
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571 assert(!isHumongous(word_size) || word_size <= HeapRegion::GrainWords, |
| 2152 | 572 "the only time we use this to allocate a humongous region is " |
| 573 "when we are allocating a single humongous region"); | |
| 574 | |
| 575 HeapRegion* res; | |
| 576 if (G1StressConcRegionFreeing) { | |
| 577 if (!_secondary_free_list.is_empty()) { | |
| 578 if (G1ConcRegionFreeingVerbose) { | |
| 579 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 580 "forced to look at the secondary_free_list"); | |
| 581 } | |
| 2361 | 582 res = new_region_try_secondary_free_list(); |
| 2152 | 583 if (res != NULL) { |
| 584 return res; | |
| 585 } | |
| 586 } | |
| 587 } | |
| 588 res = _free_list.remove_head_or_null(); | |
| 589 if (res == NULL) { | |
| 590 if (G1ConcRegionFreeingVerbose) { | |
| 591 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 592 "res == NULL, trying the secondary_free_list"); | |
| 593 } | |
| 2361 | 594 res = new_region_try_secondary_free_list(); |
| 2152 | 595 } |
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596 if (res == NULL && do_expand && _expand_heap_after_alloc_failure) { |
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597 // Currently, only attempts to allocate GC alloc regions set |
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598 // do_expand to true. So, we should only reach here during a |
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599 // safepoint. If this assumption changes we might have to |
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600 // reconsider the use of _expand_heap_after_alloc_failure. |
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601 assert(SafepointSynchronize::is_at_safepoint(), "invariant"); |
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602 |
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603 ergo_verbose1(ErgoHeapSizing, |
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604 "attempt heap expansion", |
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605 ergo_format_reason("region allocation request failed") |
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606 ergo_format_byte("allocation request"), |
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607 word_size * HeapWordSize); |
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608 if (expand(word_size * HeapWordSize)) { |
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609 // Given that expand() succeeded in expanding the heap, and we |
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610 // always expand the heap by an amount aligned to the heap |
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611 // region size, the free list should in theory not be empty. So |
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612 // it would probably be OK to use remove_head(). But the extra |
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613 // check for NULL is unlikely to be a performance issue here (we |
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614 // just expanded the heap!) so let's just be conservative and |
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615 // use remove_head_or_null(). |
| 3766 | 616 res = _free_list.remove_head_or_null(); |
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617 } else { |
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618 _expand_heap_after_alloc_failure = false; |
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619 } |
| 342 | 620 } |
| 621 return res; | |
| 622 } | |
| 623 | |
| 3766 | 624 size_t G1CollectedHeap::humongous_obj_allocate_find_first(size_t num_regions, |
| 625 size_t word_size) { | |
| 2361 | 626 assert(isHumongous(word_size), "word_size should be humongous"); |
| 627 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
| 628 | |
| 3766 | 629 size_t first = G1_NULL_HRS_INDEX; |
| 2152 | 630 if (num_regions == 1) { |
| 631 // Only one region to allocate, no need to go through the slower | |
| 632 // path. The caller will attempt the expasion if this fails, so | |
| 633 // let's not try to expand here too. | |
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634 HeapRegion* hr = new_region(word_size, false /* do_expand */); |
| 2152 | 635 if (hr != NULL) { |
| 636 first = hr->hrs_index(); | |
| 637 } else { | |
| 3766 | 638 first = G1_NULL_HRS_INDEX; |
| 2152 | 639 } |
| 640 } else { | |
| 641 // We can't allocate humongous regions while cleanupComplete() is | |
| 642 // running, since some of the regions we find to be empty might not | |
| 643 // yet be added to the free list and it is not straightforward to | |
| 644 // know which list they are on so that we can remove them. Note | |
| 645 // that we only need to do this if we need to allocate more than | |
| 646 // one region to satisfy the current humongous allocation | |
| 647 // request. If we are only allocating one region we use the common | |
| 648 // region allocation code (see above). | |
| 649 wait_while_free_regions_coming(); | |
| 2361 | 650 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 651 |
| 652 if (free_regions() >= num_regions) { | |
| 3766 | 653 first = _hrs.find_contiguous(num_regions); |
| 654 if (first != G1_NULL_HRS_INDEX) { | |
| 655 for (size_t i = first; i < first + num_regions; ++i) { | |
| 656 HeapRegion* hr = region_at(i); | |
| 2152 | 657 assert(hr->is_empty(), "sanity"); |
| 2361 | 658 assert(is_on_master_free_list(hr), "sanity"); |
| 2152 | 659 hr->set_pending_removal(true); |
| 660 } | |
| 661 _free_list.remove_all_pending(num_regions); | |
| 662 } | |
| 663 } | |
| 664 } | |
| 665 return first; | |
| 666 } | |
| 667 | |
| 2361 | 668 HeapWord* |
| 3766 | 669 G1CollectedHeap::humongous_obj_allocate_initialize_regions(size_t first, |
| 2361 | 670 size_t num_regions, |
| 671 size_t word_size) { | |
| 3766 | 672 assert(first != G1_NULL_HRS_INDEX, "pre-condition"); |
| 2361 | 673 assert(isHumongous(word_size), "word_size should be humongous"); |
| 674 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
| 675 | |
| 676 // Index of last region in the series + 1. | |
| 3766 | 677 size_t last = first + num_regions; |
| 2361 | 678 |
| 679 // We need to initialize the region(s) we just discovered. This is | |
| 680 // a bit tricky given that it can happen concurrently with | |
| 681 // refinement threads refining cards on these regions and | |
| 682 // potentially wanting to refine the BOT as they are scanning | |
| 683 // those cards (this can happen shortly after a cleanup; see CR | |
| 684 // 6991377). So we have to set up the region(s) carefully and in | |
| 685 // a specific order. | |
| 686 | |
| 687 // The word size sum of all the regions we will allocate. | |
| 688 size_t word_size_sum = num_regions * HeapRegion::GrainWords; | |
| 689 assert(word_size <= word_size_sum, "sanity"); | |
| 690 | |
| 691 // This will be the "starts humongous" region. | |
| 3766 | 692 HeapRegion* first_hr = region_at(first); |
| 2361 | 693 // The header of the new object will be placed at the bottom of |
| 694 // the first region. | |
| 695 HeapWord* new_obj = first_hr->bottom(); | |
| 696 // This will be the new end of the first region in the series that | |
| 697 // should also match the end of the last region in the seriers. | |
| 698 HeapWord* new_end = new_obj + word_size_sum; | |
| 699 // This will be the new top of the first region that will reflect | |
| 700 // this allocation. | |
| 701 HeapWord* new_top = new_obj + word_size; | |
| 702 | |
| 703 // First, we need to zero the header of the space that we will be | |
| 704 // allocating. When we update top further down, some refinement | |
| 705 // threads might try to scan the region. By zeroing the header we | |
| 706 // ensure that any thread that will try to scan the region will | |
| 707 // come across the zero klass word and bail out. | |
| 708 // | |
| 709 // NOTE: It would not have been correct to have used | |
| 710 // CollectedHeap::fill_with_object() and make the space look like | |
| 711 // an int array. The thread that is doing the allocation will | |
| 712 // later update the object header to a potentially different array | |
| 713 // type and, for a very short period of time, the klass and length | |
| 714 // fields will be inconsistent. This could cause a refinement | |
| 715 // thread to calculate the object size incorrectly. | |
| 716 Copy::fill_to_words(new_obj, oopDesc::header_size(), 0); | |
| 717 | |
| 718 // We will set up the first region as "starts humongous". This | |
| 719 // will also update the BOT covering all the regions to reflect | |
| 720 // that there is a single object that starts at the bottom of the | |
| 721 // first region. | |
| 722 first_hr->set_startsHumongous(new_top, new_end); | |
| 723 | |
| 724 // Then, if there are any, we will set up the "continues | |
| 725 // humongous" regions. | |
| 726 HeapRegion* hr = NULL; | |
| 3766 | 727 for (size_t i = first + 1; i < last; ++i) { |
| 728 hr = region_at(i); | |
| 2361 | 729 hr->set_continuesHumongous(first_hr); |
| 730 } | |
| 731 // If we have "continues humongous" regions (hr != NULL), then the | |
| 732 // end of the last one should match new_end. | |
| 733 assert(hr == NULL || hr->end() == new_end, "sanity"); | |
| 734 | |
| 735 // Up to this point no concurrent thread would have been able to | |
| 736 // do any scanning on any region in this series. All the top | |
| 737 // fields still point to bottom, so the intersection between | |
| 738 // [bottom,top] and [card_start,card_end] will be empty. Before we | |
| 739 // update the top fields, we'll do a storestore to make sure that | |
| 740 // no thread sees the update to top before the zeroing of the | |
| 741 // object header and the BOT initialization. | |
| 742 OrderAccess::storestore(); | |
| 743 | |
| 744 // Now that the BOT and the object header have been initialized, | |
| 745 // we can update top of the "starts humongous" region. | |
| 746 assert(first_hr->bottom() < new_top && new_top <= first_hr->end(), | |
| 747 "new_top should be in this region"); | |
| 748 first_hr->set_top(new_top); | |
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749 if (_hr_printer.is_active()) { |
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750 HeapWord* bottom = first_hr->bottom(); |
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751 HeapWord* end = first_hr->orig_end(); |
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752 if ((first + 1) == last) { |
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753 // the series has a single humongous region |
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754 _hr_printer.alloc(G1HRPrinter::SingleHumongous, first_hr, new_top); |
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755 } else { |
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756 // the series has more than one humongous regions |
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757 _hr_printer.alloc(G1HRPrinter::StartsHumongous, first_hr, end); |
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758 } |
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759 } |
| 2361 | 760 |
| 761 // Now, we will update the top fields of the "continues humongous" | |
| 762 // regions. The reason we need to do this is that, otherwise, | |
| 763 // these regions would look empty and this will confuse parts of | |
| 764 // G1. For example, the code that looks for a consecutive number | |
| 765 // of empty regions will consider them empty and try to | |
| 766 // re-allocate them. We can extend is_empty() to also include | |
| 767 // !continuesHumongous(), but it is easier to just update the top | |
| 768 // fields here. The way we set top for all regions (i.e., top == | |
| 769 // end for all regions but the last one, top == new_top for the | |
| 770 // last one) is actually used when we will free up the humongous | |
| 771 // region in free_humongous_region(). | |
| 772 hr = NULL; | |
| 3766 | 773 for (size_t i = first + 1; i < last; ++i) { |
| 774 hr = region_at(i); | |
| 2361 | 775 if ((i + 1) == last) { |
| 776 // last continues humongous region | |
| 777 assert(hr->bottom() < new_top && new_top <= hr->end(), | |
| 778 "new_top should fall on this region"); | |
| 779 hr->set_top(new_top); | |
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780 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, new_top); |
| 2361 | 781 } else { |
| 782 // not last one | |
| 783 assert(new_top > hr->end(), "new_top should be above this region"); | |
| 784 hr->set_top(hr->end()); | |
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785 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, hr->end()); |
| 2361 | 786 } |
| 787 } | |
| 788 // If we have continues humongous regions (hr != NULL), then the | |
| 789 // end of the last one should match new_end and its top should | |
| 790 // match new_top. | |
| 791 assert(hr == NULL || | |
| 792 (hr->end() == new_end && hr->top() == new_top), "sanity"); | |
| 793 | |
| 794 assert(first_hr->used() == word_size * HeapWordSize, "invariant"); | |
| 795 _summary_bytes_used += first_hr->used(); | |
| 796 _humongous_set.add(first_hr); | |
| 797 | |
| 798 return new_obj; | |
| 799 } | |
| 800 | |
| 342 | 801 // If could fit into free regions w/o expansion, try. |
| 802 // Otherwise, if can expand, do so. | |
| 803 // Otherwise, if using ex regions might help, try with ex given back. | |
| 1973 | 804 HeapWord* G1CollectedHeap::humongous_obj_allocate(size_t word_size) { |
| 2152 | 805 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
| 806 | |
| 807 verify_region_sets_optional(); | |
| 342 | 808 |
| 809 size_t num_regions = | |
| 1973 | 810 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; |
| 342 | 811 size_t x_size = expansion_regions(); |
| 3766 | 812 size_t fs = _hrs.free_suffix(); |
| 813 size_t first = humongous_obj_allocate_find_first(num_regions, word_size); | |
| 814 if (first == G1_NULL_HRS_INDEX) { | |
| 2152 | 815 // The only thing we can do now is attempt expansion. |
| 342 | 816 if (fs + x_size >= num_regions) { |
|
2188
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817 // If the number of regions we're trying to allocate for this |
|
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|
818 // object is at most the number of regions in the free suffix, |
|
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819 // then the call to humongous_obj_allocate_find_first() above |
|
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820 // should have succeeded and we wouldn't be here. |
|
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821 // |
|
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|
822 // We should only be trying to expand when the free suffix is |
|
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|
823 // not sufficient for the object _and_ we have some expansion |
|
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|
824 // room available. |
|
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|
825 assert(num_regions > fs, "earlier allocation should have succeeded"); |
|
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|
826 |
|
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|
827 ergo_verbose1(ErgoHeapSizing, |
|
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|
828 "attempt heap expansion", |
|
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|
829 ergo_format_reason("humongous allocation request failed") |
|
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|
830 ergo_format_byte("allocation request"), |
|
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|
831 word_size * HeapWordSize); |
|
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832 if (expand((num_regions - fs) * HeapRegion::GrainBytes)) { |
| 3766 | 833 // Even though the heap was expanded, it might not have |
| 834 // reached the desired size. So, we cannot assume that the | |
| 835 // allocation will succeed. | |
|
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836 first = humongous_obj_allocate_find_first(num_regions, word_size); |
|
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|
837 } |
| 2152 | 838 } |
| 839 } | |
| 840 | |
| 2361 | 841 HeapWord* result = NULL; |
| 3766 | 842 if (first != G1_NULL_HRS_INDEX) { |
| 2361 | 843 result = |
| 844 humongous_obj_allocate_initialize_regions(first, num_regions, word_size); | |
| 845 assert(result != NULL, "it should always return a valid result"); | |
|
3980
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|
846 |
|
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|
847 // A successful humongous object allocation changes the used space |
|
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|
848 // information of the old generation so we need to recalculate the |
|
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|
849 // sizes and update the jstat counters here. |
|
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|
850 g1mm()->update_sizes(); |
| 2152 | 851 } |
| 852 | |
| 853 verify_region_sets_optional(); | |
| 2361 | 854 |
| 855 return result; | |
| 342 | 856 } |
| 857 | |
| 1973 | 858 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
| 859 assert_heap_not_locked_and_not_at_safepoint(); | |
|
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|
860 assert(!isHumongous(word_size), "we do not allow humongous TLABs"); |
|
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|
861 |
|
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|
862 unsigned int dummy_gc_count_before; |
|
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|
863 return attempt_allocation(word_size, &dummy_gc_count_before); |
| 342 | 864 } |
| 865 | |
| 866 HeapWord* | |
| 867 G1CollectedHeap::mem_allocate(size_t word_size, | |
| 1973 | 868 bool* gc_overhead_limit_was_exceeded) { |
| 869 assert_heap_not_locked_and_not_at_safepoint(); | |
| 342 | 870 |
|
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|
871 // Loop until the allocation is satisified, or unsatisfied after GC. |
| 1973 | 872 for (int try_count = 1; /* we'll return */; try_count += 1) { |
| 873 unsigned int gc_count_before; | |
|
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|
874 |
|
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|
875 HeapWord* result = NULL; |
|
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|
876 if (!isHumongous(word_size)) { |
|
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|
877 result = attempt_allocation(word_size, &gc_count_before); |
|
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|
878 } else { |
|
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|
879 result = attempt_allocation_humongous(word_size, &gc_count_before); |
|
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|
880 } |
|
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|
881 if (result != NULL) { |
|
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|
882 return result; |
| 342 | 883 } |
| 884 | |
| 885 // Create the garbage collection operation... | |
| 1973 | 886 VM_G1CollectForAllocation op(gc_count_before, word_size); |
| 342 | 887 // ...and get the VM thread to execute it. |
| 888 VMThread::execute(&op); | |
| 1973 | 889 |
| 890 if (op.prologue_succeeded() && op.pause_succeeded()) { | |
| 891 // If the operation was successful we'll return the result even | |
| 892 // if it is NULL. If the allocation attempt failed immediately | |
| 893 // after a Full GC, it's unlikely we'll be able to allocate now. | |
| 894 HeapWord* result = op.result(); | |
| 895 if (result != NULL && !isHumongous(word_size)) { | |
| 896 // Allocations that take place on VM operations do not do any | |
| 897 // card dirtying and we have to do it here. We only have to do | |
| 898 // this for non-humongous allocations, though. | |
| 899 dirty_young_block(result, word_size); | |
| 900 } | |
| 342 | 901 return result; |
| 1973 | 902 } else { |
| 903 assert(op.result() == NULL, | |
| 904 "the result should be NULL if the VM op did not succeed"); | |
| 342 | 905 } |
| 906 | |
| 907 // Give a warning if we seem to be looping forever. | |
| 908 if ((QueuedAllocationWarningCount > 0) && | |
| 909 (try_count % QueuedAllocationWarningCount == 0)) { | |
| 1973 | 910 warning("G1CollectedHeap::mem_allocate retries %d times", try_count); |
| 342 | 911 } |
| 912 } | |
| 1973 | 913 |
| 914 ShouldNotReachHere(); | |
|
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|
915 return NULL; |
| 342 | 916 } |
| 917 | |
|
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|
918 HeapWord* G1CollectedHeap::attempt_allocation_slow(size_t word_size, |
|
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|
919 unsigned int *gc_count_before_ret) { |
|
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|
920 // Make sure you read the note in attempt_allocation_humongous(). |
|
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|
921 |
|
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|
922 assert_heap_not_locked_and_not_at_safepoint(); |
|
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|
923 assert(!isHumongous(word_size), "attempt_allocation_slow() should not " |
|
abdfc822206f
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|
924 "be called for humongous allocation requests"); |
|
abdfc822206f
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|
925 |
|
abdfc822206f
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diff
changeset
|
926 // We should only get here after the first-level allocation attempt |
|
abdfc822206f
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diff
changeset
|
927 // (attempt_allocation()) failed to allocate. |
|
abdfc822206f
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diff
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|
928 |
|
abdfc822206f
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diff
changeset
|
929 // We will loop until a) we manage to successfully perform the |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
changeset
|
930 // allocation or b) we successfully schedule a collection which |
|
abdfc822206f
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|
931 // fails to perform the allocation. b) is the only case when we'll |
|
abdfc822206f
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diff
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|
932 // return NULL. |
|
abdfc822206f
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diff
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|
933 HeapWord* result = NULL; |
|
abdfc822206f
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diff
changeset
|
934 for (int try_count = 1; /* we'll return */; try_count += 1) { |
|
abdfc822206f
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diff
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|
935 bool should_try_gc; |
|
abdfc822206f
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diff
changeset
|
936 unsigned int gc_count_before; |
|
abdfc822206f
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diff
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|
937 |
|
abdfc822206f
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diff
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|
938 { |
|
abdfc822206f
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diff
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|
939 MutexLockerEx x(Heap_lock); |
|
abdfc822206f
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diff
changeset
|
940 |
|
abdfc822206f
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diff
changeset
|
941 result = _mutator_alloc_region.attempt_allocation_locked(word_size, |
|
abdfc822206f
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|
942 false /* bot_updates */); |
|
abdfc822206f
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diff
changeset
|
943 if (result != NULL) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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diff
changeset
|
944 return result; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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diff
changeset
|
945 } |
|
abdfc822206f
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diff
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|
946 |
|
abdfc822206f
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changeset
|
947 // If we reach here, attempt_allocation_locked() above failed to |
|
abdfc822206f
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diff
changeset
|
948 // allocate a new region. So the mutator alloc region should be NULL. |
|
abdfc822206f
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diff
changeset
|
949 assert(_mutator_alloc_region.get() == NULL, "only way to get here"); |
|
abdfc822206f
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|
950 |
|
abdfc822206f
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diff
changeset
|
951 if (GC_locker::is_active_and_needs_gc()) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
952 if (g1_policy()->can_expand_young_list()) { |
|
3914
20213c8a3c40
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|
953 // No need for an ergo verbose message here, |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3886
diff
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|
954 // can_expand_young_list() does this when it returns true. |
|
2433
abdfc822206f
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|
955 result = _mutator_alloc_region.attempt_allocation_force(word_size, |
|
abdfc822206f
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|
956 false /* bot_updates */); |
|
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diff
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|
957 if (result != NULL) { |
|
abdfc822206f
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diff
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|
958 return result; |
|
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diff
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|
959 } |
|
abdfc822206f
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|
960 } |
|
abdfc822206f
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|
961 should_try_gc = false; |
|
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|
962 } else { |
|
abdfc822206f
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diff
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|
963 // Read the GC count while still holding the Heap_lock. |
|
abdfc822206f
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|
964 gc_count_before = SharedHeap::heap()->total_collections(); |
|
abdfc822206f
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|
965 should_try_gc = true; |
|
abdfc822206f
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|
966 } |
|
abdfc822206f
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|
967 } |
|
abdfc822206f
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|
968 |
|
abdfc822206f
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diff
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|
969 if (should_try_gc) { |
|
abdfc822206f
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|
970 bool succeeded; |
|
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|
971 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
|
abdfc822206f
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|
972 if (result != NULL) { |
|
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diff
changeset
|
973 assert(succeeded, "only way to get back a non-NULL result"); |
|
abdfc822206f
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|
974 return result; |
|
abdfc822206f
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2432
diff
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|
975 } |
|
abdfc822206f
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|
976 |
|
abdfc822206f
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diff
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|
977 if (succeeded) { |
|
abdfc822206f
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diff
changeset
|
978 // If we get here we successfully scheduled a collection which |
|
abdfc822206f
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changeset
|
979 // failed to allocate. No point in trying to allocate |
|
abdfc822206f
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diff
changeset
|
980 // further. We'll just return NULL. |
|
abdfc822206f
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changeset
|
981 MutexLockerEx x(Heap_lock); |
|
abdfc822206f
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diff
changeset
|
982 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
|
abdfc822206f
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|
983 return NULL; |
|
abdfc822206f
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diff
changeset
|
984 } |
|
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|
985 } else { |
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986 GC_locker::stall_until_clear(); |
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987 } |
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988 |
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989 // We can reach here if we were unsuccessul in scheduling a |
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990 // collection (because another thread beat us to it) or if we were |
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991 // stalled due to the GC locker. In either can we should retry the |
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992 // allocation attempt in case another thread successfully |
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993 // performed a collection and reclaimed enough space. We do the |
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994 // first attempt (without holding the Heap_lock) here and the |
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995 // follow-on attempt will be at the start of the next loop |
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996 // iteration (after taking the Heap_lock). |
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997 result = _mutator_alloc_region.attempt_allocation(word_size, |
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998 false /* bot_updates */); |
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999 if (result != NULL ){ |
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1000 return result; |
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1001 } |
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1002 |
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1003 // Give a warning if we seem to be looping forever. |
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1004 if ((QueuedAllocationWarningCount > 0) && |
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1005 (try_count % QueuedAllocationWarningCount == 0)) { |
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1006 warning("G1CollectedHeap::attempt_allocation_slow() " |
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1007 "retries %d times", try_count); |
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1008 } |
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1009 } |
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1010 |
|
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1011 ShouldNotReachHere(); |
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1012 return NULL; |
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1013 } |
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1014 |
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1015 HeapWord* G1CollectedHeap::attempt_allocation_humongous(size_t word_size, |
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1016 unsigned int * gc_count_before_ret) { |
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1017 // The structure of this method has a lot of similarities to |
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1018 // attempt_allocation_slow(). The reason these two were not merged |
|
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1019 // into a single one is that such a method would require several "if |
|
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1020 // allocation is not humongous do this, otherwise do that" |
|
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1021 // conditional paths which would obscure its flow. In fact, an early |
|
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1022 // version of this code did use a unified method which was harder to |
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1023 // follow and, as a result, it had subtle bugs that were hard to |
|
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1024 // track down. So keeping these two methods separate allows each to |
|
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1025 // be more readable. It will be good to keep these two in sync as |
|
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1026 // much as possible. |
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1027 |
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1028 assert_heap_not_locked_and_not_at_safepoint(); |
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1029 assert(isHumongous(word_size), "attempt_allocation_humongous() " |
|
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1030 "should only be called for humongous allocations"); |
|
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1031 |
|
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1032 // We will loop until a) we manage to successfully perform the |
|
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1033 // allocation or b) we successfully schedule a collection which |
|
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1034 // fails to perform the allocation. b) is the only case when we'll |
|
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1035 // return NULL. |
|
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1036 HeapWord* result = NULL; |
|
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1037 for (int try_count = 1; /* we'll return */; try_count += 1) { |
|
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1038 bool should_try_gc; |
|
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1039 unsigned int gc_count_before; |
|
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1040 |
|
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1041 { |
|
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1042 MutexLockerEx x(Heap_lock); |
|
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1043 |
|
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1044 // Given that humongous objects are not allocated in young |
|
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1045 // regions, we'll first try to do the allocation without doing a |
|
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1046 // collection hoping that there's enough space in the heap. |
|
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1047 result = humongous_obj_allocate(word_size); |
|
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1048 if (result != NULL) { |
|
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|
1049 return result; |
|
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|
1050 } |
|
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1051 |
|
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1052 if (GC_locker::is_active_and_needs_gc()) { |
|
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1053 should_try_gc = false; |
|
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1054 } else { |
|
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1055 // Read the GC count while still holding the Heap_lock. |
|
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1056 gc_count_before = SharedHeap::heap()->total_collections(); |
|
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1057 should_try_gc = true; |
|
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|
1058 } |
|
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|
1059 } |
|
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1060 |
|
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1061 if (should_try_gc) { |
|
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1062 // If we failed to allocate the humongous object, we should try to |
|
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|
1063 // do a collection pause (if we're allowed) in case it reclaims |
|
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1064 // enough space for the allocation to succeed after the pause. |
|
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|
1065 |
|
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|
1066 bool succeeded; |
|
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|
1067 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
|
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|
1068 if (result != NULL) { |
|
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|
1069 assert(succeeded, "only way to get back a non-NULL result"); |
|
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|
1070 return result; |
|
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|
1071 } |
|
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|
1072 |
|
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|
1073 if (succeeded) { |
|
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|
1074 // If we get here we successfully scheduled a collection which |
|
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|
1075 // failed to allocate. No point in trying to allocate |
|
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|
1076 // further. We'll just return NULL. |
|
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|
1077 MutexLockerEx x(Heap_lock); |
|
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1078 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
|
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|
1079 return NULL; |
|
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|
1080 } |
|
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|
1081 } else { |
|
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|
1082 GC_locker::stall_until_clear(); |
|
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|
1083 } |
|
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|
1084 |
|
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|
1085 // We can reach here if we were unsuccessul in scheduling a |
|
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|
1086 // collection (because another thread beat us to it) or if we were |
|
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|
1087 // stalled due to the GC locker. In either can we should retry the |
|
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|
1088 // allocation attempt in case another thread successfully |
|
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|
1089 // performed a collection and reclaimed enough space. Give a |
|
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|
1090 // warning if we seem to be looping forever. |
|
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|
1091 |
|
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|
1092 if ((QueuedAllocationWarningCount > 0) && |
|
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|
1093 (try_count % QueuedAllocationWarningCount == 0)) { |
|
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|
1094 warning("G1CollectedHeap::attempt_allocation_humongous() " |
|
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|
1095 "retries %d times", try_count); |
|
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|
1096 } |
|
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|
1097 } |
|
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|
1098 |
|
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|
1099 ShouldNotReachHere(); |
|
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|
1100 return NULL; |
|
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|
1101 } |
|
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|
1102 |
|
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|
1103 HeapWord* G1CollectedHeap::attempt_allocation_at_safepoint(size_t word_size, |
|
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|
1104 bool expect_null_mutator_alloc_region) { |
| 2152 | 1105 assert_at_safepoint(true /* should_be_vm_thread */); |
|
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|
1106 assert(_mutator_alloc_region.get() == NULL || |
|
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|
1107 !expect_null_mutator_alloc_region, |
|
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|
1108 "the current alloc region was unexpectedly found to be non-NULL"); |
|
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|
1109 |
|
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1110 if (!isHumongous(word_size)) { |
|
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1111 return _mutator_alloc_region.attempt_allocation_locked(word_size, |
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1112 false /* bot_updates */); |
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1113 } else { |
|
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1114 return humongous_obj_allocate(word_size); |
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1115 } |
|
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1116 |
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1117 ShouldNotReachHere(); |
| 342 | 1118 } |
| 1119 | |
| 1120 class PostMCRemSetClearClosure: public HeapRegionClosure { | |
| 1121 ModRefBarrierSet* _mr_bs; | |
| 1122 public: | |
| 1123 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 1124 bool doHeapRegion(HeapRegion* r) { | |
| 1125 r->reset_gc_time_stamp(); | |
| 1126 if (r->continuesHumongous()) | |
| 1127 return false; | |
| 1128 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 1129 if (hrrs != NULL) hrrs->clear(); | |
| 1130 // You might think here that we could clear just the cards | |
| 1131 // corresponding to the used region. But no: if we leave a dirty card | |
| 1132 // in a region we might allocate into, then it would prevent that card | |
| 1133 // from being enqueued, and cause it to be missed. | |
| 1134 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
| 1135 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
| 1136 return false; | |
| 1137 } | |
| 1138 }; | |
| 1139 | |
| 1140 | |
| 1141 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
| 1142 ModRefBarrierSet* _mr_bs; | |
| 1143 public: | |
| 1144 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 1145 bool doHeapRegion(HeapRegion* r) { | |
| 1146 if (r->continuesHumongous()) return false; | |
| 1147 if (r->used_region().word_size() != 0) { | |
| 1148 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
| 1149 } | |
| 1150 return false; | |
| 1151 } | |
| 1152 }; | |
| 1153 | |
|
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1154 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
|
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1155 G1CollectedHeap* _g1h; |
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1156 UpdateRSOopClosure _cl; |
|
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1157 int _worker_i; |
|
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1158 public: |
|
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1159 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
| 1861 | 1160 _cl(g1->g1_rem_set(), worker_i), |
|
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1161 _worker_i(worker_i), |
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1162 _g1h(g1) |
|
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1163 { } |
|
1960
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1164 |
|
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1165 bool doHeapRegion(HeapRegion* r) { |
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1166 if (!r->continuesHumongous()) { |
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1167 _cl.set_from(r); |
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1168 r->oop_iterate(&_cl); |
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1169 } |
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1170 return false; |
|
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1171 } |
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1172 }; |
|
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1173 |
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1174 class ParRebuildRSTask: public AbstractGangTask { |
|
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1175 G1CollectedHeap* _g1; |
|
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1176 public: |
|
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1177 ParRebuildRSTask(G1CollectedHeap* g1) |
|
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1178 : AbstractGangTask("ParRebuildRSTask"), |
|
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1179 _g1(g1) |
|
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1180 { } |
|
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1181 |
|
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1182 void work(uint worker_id) { |
|
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1183 RebuildRSOutOfRegionClosure rebuild_rs(_g1, worker_id); |
|
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1184 _g1->heap_region_par_iterate_chunked(&rebuild_rs, worker_id, |
|
4095
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1185 _g1->workers()->active_workers(), |
|
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1186 HeapRegion::RebuildRSClaimValue); |
|
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1187 } |
|
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1188 }; |
|
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1189 |
|
3778
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1190 class PostCompactionPrinterClosure: public HeapRegionClosure { |
|
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1191 private: |
|
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1192 G1HRPrinter* _hr_printer; |
|
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1193 public: |
|
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1194 bool doHeapRegion(HeapRegion* hr) { |
|
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1195 assert(!hr->is_young(), "not expecting to find young regions"); |
|
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1196 // We only generate output for non-empty regions. |
|
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1197 if (!hr->is_empty()) { |
|
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1198 if (!hr->isHumongous()) { |
|
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1199 _hr_printer->post_compaction(hr, G1HRPrinter::Old); |
|
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1200 } else if (hr->startsHumongous()) { |
|
3986
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|
1201 if (hr->capacity() == HeapRegion::GrainBytes) { |
|
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1202 // single humongous region |
|
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1203 _hr_printer->post_compaction(hr, G1HRPrinter::SingleHumongous); |
|
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1204 } else { |
|
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|
1205 _hr_printer->post_compaction(hr, G1HRPrinter::StartsHumongous); |
|
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|
1206 } |
|
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1207 } else { |
|
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|
1208 assert(hr->continuesHumongous(), "only way to get here"); |
|
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|
1209 _hr_printer->post_compaction(hr, G1HRPrinter::ContinuesHumongous); |
|
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|
1210 } |
|
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|
1211 } |
|
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|
1212 return false; |
|
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|
1213 } |
|
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1214 |
|
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|
1215 PostCompactionPrinterClosure(G1HRPrinter* hr_printer) |
|
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1216 : _hr_printer(hr_printer) { } |
|
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1217 }; |
|
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1218 |
| 1973 | 1219 bool G1CollectedHeap::do_collection(bool explicit_gc, |
|
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|
1220 bool clear_all_soft_refs, |
| 342 | 1221 size_t word_size) { |
| 2152 | 1222 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1223 | |
|
1359
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|
1224 if (GC_locker::check_active_before_gc()) { |
| 1973 | 1225 return false; |
|
1359
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|
1226 } |
|
23b1b27ac76c
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|
1227 |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
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|
1228 SvcGCMarker sgcm(SvcGCMarker::FULL); |
| 342 | 1229 ResourceMark rm; |
| 1230 | |
|
838
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|
1231 if (PrintHeapAtGC) { |
|
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|
1232 Universe::print_heap_before_gc(); |
|
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|
1233 } |
|
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|
1234 |
| 4072 | 1235 HRSPhaseSetter x(HRSPhaseFullGC); |
| 2152 | 1236 verify_region_sets_optional(); |
| 342 | 1237 |
|
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|
1238 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
|
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|
1239 collector_policy()->should_clear_all_soft_refs(); |
|
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1240 |
|
0bfd3fb24150
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|
1241 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
|
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|
1242 |
| 342 | 1243 { |
| 1244 IsGCActiveMark x; | |
| 1245 | |
| 1246 // Timing | |
|
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|
1247 bool system_gc = (gc_cause() == GCCause::_java_lang_system_gc); |
|
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|
1248 assert(!system_gc || explicit_gc, "invariant"); |
| 342 | 1249 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
| 1250 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
|
1656
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|
1251 TraceTime t(system_gc ? "Full GC (System.gc())" : "Full GC", |
|
1387
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|
1252 PrintGC, true, gclog_or_tty); |
| 342 | 1253 |
|
3289
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6946417: G1: Java VisualVM does not support G1 properly.
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|
1254 TraceCollectorStats tcs(g1mm()->full_collection_counters()); |
|
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
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|
1255 TraceMemoryManagerStats tms(true /* fullGC */, gc_cause()); |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
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|
1256 |
| 342 | 1257 double start = os::elapsedTime(); |
| 1258 g1_policy()->record_full_collection_start(); | |
| 1259 | |
| 2152 | 1260 wait_while_free_regions_coming(); |
| 2361 | 1261 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 1262 |
| 342 | 1263 gc_prologue(true); |
|
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|
1264 increment_total_collections(true /* full gc */); |
| 342 | 1265 |
| 1266 size_t g1h_prev_used = used(); | |
| 1267 assert(used() == recalculate_used(), "Should be equal"); | |
| 1268 | |
| 1269 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
| 1270 HandleMark hm; // Discard invalid handles created during verification | |
|
2433
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|
1271 gclog_or_tty->print(" VerifyBeforeGC:"); |
| 342 | 1272 prepare_for_verify(); |
|
3772
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|
1273 Universe::verify(/* allow dirty */ true, |
|
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|
1274 /* silent */ false, |
|
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|
1275 /* option */ VerifyOption_G1UsePrevMarking); |
|
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|
1276 |
| 342 | 1277 } |
|
3869
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6810861: G1: support -XX:+{PrintClassHistogram,HeapDump}{Before,After}FullGC
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|
1278 pre_full_gc_dump(); |
| 342 | 1279 |
| 1280 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 1281 | |
|
3979
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|
1282 // Disable discovery and empty the discovered lists |
|
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1283 // for the CM ref processor. |
|
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|
1284 ref_processor_cm()->disable_discovery(); |
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1285 ref_processor_cm()->abandon_partial_discovery(); |
|
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|
1286 ref_processor_cm()->verify_no_references_recorded(); |
| 342 | 1287 |
| 1288 // Abandon current iterations of concurrent marking and concurrent | |
| 1289 // refinement, if any are in progress. | |
| 1290 concurrent_mark()->abort(); | |
| 1291 | |
| 1292 // Make sure we'll choose a new allocation region afterwards. | |
|
2433
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|
1293 release_mutator_alloc_region(); |
| 636 | 1294 abandon_gc_alloc_regions(); |
| 1861 | 1295 g1_rem_set()->cleanupHRRS(); |
|
1394
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1296 |
|
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1297 // We should call this after we retire any currently active alloc |
|
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1298 // regions so that all the ALLOC / RETIRE events are generated |
|
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1299 // before the start GC event. |
|
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1300 _hr_printer.start_gc(true /* full */, (size_t) total_collections()); |
|
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1301 |
|
1394
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1302 // We may have added regions to the current incremental collection |
|
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1303 // set between the last GC or pause and now. We need to clear the |
|
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1304 // incremental collection set and then start rebuilding it afresh |
|
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1305 // after this full GC. |
|
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1306 abandon_collection_set(g1_policy()->inc_cset_head()); |
|
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1307 g1_policy()->clear_incremental_cset(); |
|
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1308 g1_policy()->stop_incremental_cset_building(); |
|
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1309 |
| 4072 | 1310 tear_down_region_sets(false /* free_list_only */); |
| 4710 | 1311 g1_policy()->set_gcs_are_young(true); |
| 342 | 1312 |
|
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1313 // See the comments in g1CollectedHeap.hpp and |
|
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1314 // G1CollectedHeap::ref_processing_init() about |
|
1974
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1315 // how reference processing currently works in G1. |
|
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1316 |
|
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1317 // Temporarily make discovery by the STW ref processor single threaded (non-MT). |
|
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1318 ReferenceProcessorMTDiscoveryMutator stw_rp_disc_ser(ref_processor_stw(), false); |
|
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1319 |
|
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1320 // Temporarily clear the STW ref processor's _is_alive_non_header field. |
|
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1321 ReferenceProcessorIsAliveMutator stw_rp_is_alive_null(ref_processor_stw(), NULL); |
|
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1322 |
|
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1323 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
|
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1324 ref_processor_stw()->setup_policy(do_clear_all_soft_refs); |
|
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1325 |
| 342 | 1326 // Do collection work |
| 1327 { | |
| 1328 HandleMark hm; // Discard invalid handles created during gc | |
|
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|
1329 G1MarkSweep::invoke_at_safepoint(ref_processor_stw(), do_clear_all_soft_refs); |
| 342 | 1330 } |
|
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1331 |
| 2152 | 1332 assert(free_regions() == 0, "we should not have added any free regions"); |
| 4072 | 1333 rebuild_region_sets(false /* free_list_only */); |
| 342 | 1334 |
|
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1335 // Enqueue any discovered reference objects that have |
|
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|
1336 // not been removed from the discovered lists. |
|
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|
1337 ref_processor_stw()->enqueue_discovered_references(); |
| 342 | 1338 |
| 1339 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 1340 | |
|
1089
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|
1341 MemoryService::track_memory_usage(); |
|
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|
1342 |
| 342 | 1343 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
| 1344 HandleMark hm; // Discard invalid handles created during verification | |
| 1345 gclog_or_tty->print(" VerifyAfterGC:"); | |
|
637
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diff
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|
1346 prepare_for_verify(); |
|
3772
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|
1347 Universe::verify(/* allow dirty */ false, |
|
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|
1348 /* silent */ false, |
|
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|
1349 /* option */ VerifyOption_G1UsePrevMarking); |
|
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|
1350 |
| 342 | 1351 } |
|
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|
1352 |
|
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|
1353 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
|
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|
1354 ref_processor_stw()->verify_no_references_recorded(); |
|
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|
1355 |
|
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|
1356 // Note: since we've just done a full GC, concurrent |
|
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1357 // marking is no longer active. Therefore we need not |
|
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|
1358 // re-enable reference discovery for the CM ref processor. |
|
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|
1359 // That will be done at the start of the next marking cycle. |
|
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|
1360 assert(!ref_processor_cm()->discovery_enabled(), "Postcondition"); |
|
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|
1361 ref_processor_cm()->verify_no_references_recorded(); |
| 342 | 1362 |
| 1363 reset_gc_time_stamp(); | |
| 1364 // Since everything potentially moved, we will clear all remembered | |
|
626
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1365 // sets, and clear all cards. Later we will rebuild remebered |
|
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|
1366 // sets. We will also reset the GC time stamps of the regions. |
| 342 | 1367 PostMCRemSetClearClosure rs_clear(mr_bs()); |
| 1368 heap_region_iterate(&rs_clear); | |
| 1369 | |
| 1370 // Resize the heap if necessary. | |
|
1656
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|
1371 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
| 342 | 1372 |
|
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|
1373 if (_hr_printer.is_active()) { |
|
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|
1374 // We should do this after we potentially resize the heap so |
|
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|
1375 // that all the COMMIT / UNCOMMIT events are generated before |
|
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|
1376 // the end GC event. |
|
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|
1377 |
|
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|
1378 PostCompactionPrinterClosure cl(hr_printer()); |
|
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|
1379 heap_region_iterate(&cl); |
|
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|
1380 |
|
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|
1381 _hr_printer.end_gc(true /* full */, (size_t) total_collections()); |
|
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|
1382 } |
|
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|
1383 |
| 342 | 1384 if (_cg1r->use_cache()) { |
| 1385 _cg1r->clear_and_record_card_counts(); | |
| 1386 _cg1r->clear_hot_cache(); | |
| 1387 } | |
| 1388 | |
|
626
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|
1389 // Rebuild remembered sets of all regions. |
|
1833
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diff
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|
1390 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
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|
1391 uint n_workers = |
|
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|
1392 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
|
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|
1393 workers()->active_workers(), |
|
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|
1394 Threads::number_of_non_daemon_threads()); |
|
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|
1395 assert(UseDynamicNumberOfGCThreads || |
|
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|
1396 n_workers == workers()->total_workers(), |
|
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|
1397 "If not dynamic should be using all the workers"); |
|
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|
1398 workers()->set_active_workers(n_workers); |
|
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|
1399 // Set parallel threads in the heap (_n_par_threads) only |
|
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|
1400 // before a parallel phase and always reset it to 0 after |
|
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|
1401 // the phase so that the number of parallel threads does |
|
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|
1402 // no get carried forward to a serial phase where there |
|
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|
1403 // may be code that is "possibly_parallel". |
|
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|
1404 set_par_threads(n_workers); |
|
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|
1405 |
|
626
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|
1406 ParRebuildRSTask rebuild_rs_task(this); |
|
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|
1407 assert(check_heap_region_claim_values( |
|
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|
1408 HeapRegion::InitialClaimValue), "sanity check"); |
|
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|
1409 assert(UseDynamicNumberOfGCThreads || |
|
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|
1410 workers()->active_workers() == workers()->total_workers(), |
|
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|
1411 "Unless dynamic should use total workers"); |
|
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|
1412 // Use the most recent number of active workers |
|
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|
1413 assert(workers()->active_workers() > 0, |
|
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|
1414 "Active workers not properly set"); |
|
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|
1415 set_par_threads(workers()->active_workers()); |
|
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|
1416 workers()->run_task(&rebuild_rs_task); |
|
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|
1417 set_par_threads(0); |
|
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|
1418 assert(check_heap_region_claim_values( |
|
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|
1419 HeapRegion::RebuildRSClaimValue), "sanity check"); |
|
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|
1420 reset_heap_region_claim_values(); |
|
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|
1421 } else { |
|
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|
1422 RebuildRSOutOfRegionClosure rebuild_rs(this); |
|
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|
1423 heap_region_iterate(&rebuild_rs); |
|
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|
1424 } |
|
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|
1425 |
| 342 | 1426 if (PrintGC) { |
| 1427 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
| 1428 } | |
| 1429 | |
| 1430 if (true) { // FIXME | |
| 1431 // Ask the permanent generation to adjust size for full collections | |
| 1432 perm()->compute_new_size(); | |
| 1433 } | |
| 1434 | |
|
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|
1435 // Start a new incremental collection set for the next pause |
|
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|
1436 assert(g1_policy()->collection_set() == NULL, "must be"); |
|
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|
1437 g1_policy()->start_incremental_cset_building(); |
|
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|
1438 |
|
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|
1439 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
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|
1440 // regions to the incremental collection set for the next |
|
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|
1441 // evacuation pause. |
|
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|
1442 clear_cset_fast_test(); |
|
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|
1443 |
|
2433
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|
1444 init_mutator_alloc_region(); |
|
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|
1445 |
| 342 | 1446 double end = os::elapsedTime(); |
| 1447 g1_policy()->record_full_collection_end(); | |
| 1448 | |
|
546
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6690928: Use spinning in combination with yields for workstealing termination.
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|
1449 #ifdef TRACESPINNING |
|
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|
1450 ParallelTaskTerminator::print_termination_counts(); |
|
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|
1451 #endif |
|
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|
1452 |
| 342 | 1453 gc_epilogue(true); |
| 1454 | |
| 794 | 1455 // Discard all rset updates |
| 1456 JavaThread::dirty_card_queue_set().abandon_logs(); | |
|
616
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|
1457 assert(!G1DeferredRSUpdate |
|
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1458 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
| 342 | 1459 } |
| 1460 | |
|
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1461 _young_list->reset_sampled_info(); |
|
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1462 // At this point there should be no regions in the |
|
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1463 // entire heap tagged as young. |
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1464 assert( check_young_list_empty(true /* check_heap */), |
|
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1465 "young list should be empty at this point"); |
|
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1466 |
|
1656
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1467 // Update the number of full collections that have been completed. |
|
2030
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1468 increment_full_collections_completed(false /* concurrent */); |
|
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1469 |
| 3766 | 1470 _hrs.verify_optional(); |
| 2152 | 1471 verify_region_sets_optional(); |
| 1472 | |
|
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1473 if (PrintHeapAtGC) { |
|
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|
1474 Universe::print_heap_after_gc(); |
|
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|
1475 } |
|
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|
1476 g1mm()->update_sizes(); |
|
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|
1477 post_full_gc_dump(); |
| 1973 | 1478 |
| 1479 return true; | |
| 342 | 1480 } |
| 1481 | |
| 1482 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
| 1973 | 1483 // do_collection() will return whether it succeeded in performing |
| 1484 // the GC. Currently, there is no facility on the | |
| 1485 // do_full_collection() API to notify the caller than the collection | |
| 1486 // did not succeed (e.g., because it was locked out by the GC | |
| 1487 // locker). So, right now, we'll ignore the return value. | |
| 1488 bool dummy = do_collection(true, /* explicit_gc */ | |
| 1489 clear_all_soft_refs, | |
| 1490 0 /* word_size */); | |
| 342 | 1491 } |
| 1492 | |
| 1493 // This code is mostly copied from TenuredGeneration. | |
| 1494 void | |
| 1495 G1CollectedHeap:: | |
| 1496 resize_if_necessary_after_full_collection(size_t word_size) { | |
| 1497 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
| 1498 | |
| 1499 // Include the current allocation, if any, and bytes that will be | |
| 1500 // pre-allocated to support collections, as "used". | |
| 1501 const size_t used_after_gc = used(); | |
| 1502 const size_t capacity_after_gc = capacity(); | |
| 1503 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
| 1504 | |
|
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1505 // This is enforced in arguments.cpp. |
|
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|
1506 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
|
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|
1507 "otherwise the code below doesn't make sense"); |
|
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|
1508 |
| 342 | 1509 // We don't have floating point command-line arguments |
|
1717
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|
1510 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
| 342 | 1511 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
|
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1512 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
| 342 | 1513 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
| 1514 | |
|
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1515 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
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1516 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
|
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1517 |
|
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1518 // We have to be careful here as these two calculations can overflow |
|
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|
1519 // 32-bit size_t's. |
|
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|
1520 double used_after_gc_d = (double) used_after_gc; |
|
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|
1521 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
|
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|
1522 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
|
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|
1523 |
|
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|
1524 // Let's make sure that they are both under the max heap size, which |
|
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|
1525 // by default will make them fit into a size_t. |
|
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|
1526 double desired_capacity_upper_bound = (double) max_heap_size; |
|
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|
1527 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
|
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|
1528 desired_capacity_upper_bound); |
|
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|
1529 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
|
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|
1530 desired_capacity_upper_bound); |
|
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|
1531 |
|
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|
1532 // We can now safely turn them into size_t's. |
|
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|
1533 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
|
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|
1534 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
|
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|
1535 |
|
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|
1536 // This assert only makes sense here, before we adjust them |
|
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|
1537 // with respect to the min and max heap size. |
|
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|
1538 assert(minimum_desired_capacity <= maximum_desired_capacity, |
|
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|
1539 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
|
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|
1540 "maximum_desired_capacity = "SIZE_FORMAT, |
|
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|
1541 minimum_desired_capacity, maximum_desired_capacity)); |
|
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|
1542 |
|
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|
1543 // Should not be greater than the heap max size. No need to adjust |
|
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|
1544 // it with respect to the heap min size as it's a lower bound (i.e., |
|
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|
1545 // we'll try to make the capacity larger than it, not smaller). |
|
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|
1546 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
|
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|
1547 // Should not be less than the heap min size. No need to adjust it |
|
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|
1548 // with respect to the heap max size as it's an upper bound (i.e., |
|
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|
1549 // we'll try to make the capacity smaller than it, not greater). |
|
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|
1550 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
| 342 | 1551 |
|
1717
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|
1552 if (capacity_after_gc < minimum_desired_capacity) { |
| 342 | 1553 // Don't expand unless it's significant |
| 1554 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
|
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|
1555 ergo_verbose4(ErgoHeapSizing, |
|
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|
1556 "attempt heap expansion", |
|
20213c8a3c40
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|
1557 ergo_format_reason("capacity lower than " |
|
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|
1558 "min desired capacity after Full GC") |
|
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|
1559 ergo_format_byte("capacity") |
|
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|
1560 ergo_format_byte("occupancy") |
|
20213c8a3c40
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|
1561 ergo_format_byte_perc("min desired capacity"), |
|
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|
1562 capacity_after_gc, used_after_gc, |
|
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|
1563 minimum_desired_capacity, (double) MinHeapFreeRatio); |
|
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|
1564 expand(expand_bytes); |
| 342 | 1565 |
| 1566 // No expansion, now see if we want to shrink | |
|
1717
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|
1567 } else if (capacity_after_gc > maximum_desired_capacity) { |
| 342 | 1568 // Capacity too large, compute shrinking size |
| 1569 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
|
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|
1570 ergo_verbose4(ErgoHeapSizing, |
|
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|
1571 "attempt heap shrinking", |
|
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|
1572 ergo_format_reason("capacity higher than " |
|
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|
1573 "max desired capacity after Full GC") |
|
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|
1574 ergo_format_byte("capacity") |
|
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|
1575 ergo_format_byte("occupancy") |
|
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|
1576 ergo_format_byte_perc("max desired capacity"), |
|
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|
1577 capacity_after_gc, used_after_gc, |
|
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|
1578 maximum_desired_capacity, (double) MaxHeapFreeRatio); |
| 342 | 1579 shrink(shrink_bytes); |
| 1580 } | |
| 1581 } | |
| 1582 | |
| 1583 | |
| 1584 HeapWord* | |
| 1973 | 1585 G1CollectedHeap::satisfy_failed_allocation(size_t word_size, |
| 1586 bool* succeeded) { | |
| 2152 | 1587 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1973 | 1588 |
| 1589 *succeeded = true; | |
| 1590 // Let's attempt the allocation first. | |
|
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1591 HeapWord* result = |
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1592 attempt_allocation_at_safepoint(word_size, |
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1593 false /* expect_null_mutator_alloc_region */); |
| 1973 | 1594 if (result != NULL) { |
| 1595 assert(*succeeded, "sanity"); | |
| 1596 return result; | |
| 1597 } | |
| 342 | 1598 |
| 1599 // In a G1 heap, we're supposed to keep allocation from failing by | |
| 1600 // incremental pauses. Therefore, at least for now, we'll favor | |
| 1601 // expansion over collection. (This might change in the future if we can | |
| 1602 // do something smarter than full collection to satisfy a failed alloc.) | |
| 1603 result = expand_and_allocate(word_size); | |
| 1604 if (result != NULL) { | |
| 1973 | 1605 assert(*succeeded, "sanity"); |
| 342 | 1606 return result; |
| 1607 } | |
| 1608 | |
| 1973 | 1609 // Expansion didn't work, we'll try to do a Full GC. |
| 1610 bool gc_succeeded = do_collection(false, /* explicit_gc */ | |
| 1611 false, /* clear_all_soft_refs */ | |
| 1612 word_size); | |
| 1613 if (!gc_succeeded) { | |
| 1614 *succeeded = false; | |
| 1615 return NULL; | |
| 1616 } | |
| 1617 | |
| 1618 // Retry the allocation | |
| 1619 result = attempt_allocation_at_safepoint(word_size, | |
|
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1620 true /* expect_null_mutator_alloc_region */); |
| 342 | 1621 if (result != NULL) { |
| 1973 | 1622 assert(*succeeded, "sanity"); |
| 342 | 1623 return result; |
| 1624 } | |
| 1625 | |
| 1973 | 1626 // Then, try a Full GC that will collect all soft references. |
| 1627 gc_succeeded = do_collection(false, /* explicit_gc */ | |
| 1628 true, /* clear_all_soft_refs */ | |
| 1629 word_size); | |
| 1630 if (!gc_succeeded) { | |
| 1631 *succeeded = false; | |
| 1632 return NULL; | |
| 1633 } | |
| 1634 | |
| 1635 // Retry the allocation once more | |
| 1636 result = attempt_allocation_at_safepoint(word_size, | |
|
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1637 true /* expect_null_mutator_alloc_region */); |
| 342 | 1638 if (result != NULL) { |
| 1973 | 1639 assert(*succeeded, "sanity"); |
| 342 | 1640 return result; |
| 1641 } | |
| 1642 | |
|
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1643 assert(!collector_policy()->should_clear_all_soft_refs(), |
| 1973 | 1644 "Flag should have been handled and cleared prior to this point"); |
|
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1645 |
| 342 | 1646 // What else? We might try synchronous finalization later. If the total |
| 1647 // space available is large enough for the allocation, then a more | |
| 1648 // complete compaction phase than we've tried so far might be | |
| 1649 // appropriate. | |
| 1973 | 1650 assert(*succeeded, "sanity"); |
| 342 | 1651 return NULL; |
| 1652 } | |
| 1653 | |
| 1654 // Attempting to expand the heap sufficiently | |
| 1655 // to support an allocation of the given "word_size". If | |
| 1656 // successful, perform the allocation and return the address of the | |
| 1657 // allocated block, or else "NULL". | |
| 1658 | |
| 1659 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
| 2152 | 1660 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1661 | |
| 1662 verify_region_sets_optional(); | |
| 1973 | 1663 |
|
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1664 size_t expand_bytes = MAX2(word_size * HeapWordSize, MinHeapDeltaBytes); |
|
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1665 ergo_verbose1(ErgoHeapSizing, |
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1666 "attempt heap expansion", |
|
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1667 ergo_format_reason("allocation request failed") |
|
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1668 ergo_format_byte("allocation request"), |
|
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1669 word_size * HeapWordSize); |
|
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1670 if (expand(expand_bytes)) { |
| 3766 | 1671 _hrs.verify_optional(); |
|
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1672 verify_region_sets_optional(); |
|
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1673 return attempt_allocation_at_safepoint(word_size, |
|
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1674 false /* expect_null_mutator_alloc_region */); |
|
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1675 } |
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1676 return NULL; |
| 342 | 1677 } |
| 1678 | |
| 3766 | 1679 void G1CollectedHeap::update_committed_space(HeapWord* old_end, |
| 1680 HeapWord* new_end) { | |
| 1681 assert(old_end != new_end, "don't call this otherwise"); | |
| 1682 assert((HeapWord*) _g1_storage.high() == new_end, "invariant"); | |
| 1683 | |
| 1684 // Update the committed mem region. | |
| 1685 _g1_committed.set_end(new_end); | |
| 1686 // Tell the card table about the update. | |
| 1687 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
| 1688 // Tell the BOT about the update. | |
| 1689 _bot_shared->resize(_g1_committed.word_size()); | |
| 1690 } | |
| 1691 | |
|
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1692 bool G1CollectedHeap::expand(size_t expand_bytes) { |
| 342 | 1693 size_t old_mem_size = _g1_storage.committed_size(); |
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1694 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
| 342 | 1695 aligned_expand_bytes = align_size_up(aligned_expand_bytes, |
| 1696 HeapRegion::GrainBytes); | |
|
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1697 ergo_verbose2(ErgoHeapSizing, |
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1698 "expand the heap", |
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1699 ergo_format_byte("requested expansion amount") |
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1700 ergo_format_byte("attempted expansion amount"), |
|
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1701 expand_bytes, aligned_expand_bytes); |
|
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1702 |
| 3766 | 1703 // First commit the memory. |
| 1704 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
|
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1705 bool successful = _g1_storage.expand_by(aligned_expand_bytes); |
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1706 if (successful) { |
| 3766 | 1707 // Then propagate this update to the necessary data structures. |
| 1708 HeapWord* new_end = (HeapWord*) _g1_storage.high(); | |
| 1709 update_committed_space(old_end, new_end); | |
| 1710 | |
| 1711 FreeRegionList expansion_list("Local Expansion List"); | |
| 1712 MemRegion mr = _hrs.expand_by(old_end, new_end, &expansion_list); | |
| 1713 assert(mr.start() == old_end, "post-condition"); | |
| 1714 // mr might be a smaller region than what was requested if | |
| 1715 // expand_by() was unable to allocate the HeapRegion instances | |
| 1716 assert(mr.end() <= new_end, "post-condition"); | |
| 1717 | |
| 1718 size_t actual_expand_bytes = mr.byte_size(); | |
| 1719 assert(actual_expand_bytes <= aligned_expand_bytes, "post-condition"); | |
| 1720 assert(actual_expand_bytes == expansion_list.total_capacity_bytes(), | |
| 1721 "post-condition"); | |
| 1722 if (actual_expand_bytes < aligned_expand_bytes) { | |
| 1723 // We could not expand _hrs to the desired size. In this case we | |
| 1724 // need to shrink the committed space accordingly. | |
| 1725 assert(mr.end() < new_end, "invariant"); | |
| 1726 | |
| 1727 size_t diff_bytes = aligned_expand_bytes - actual_expand_bytes; | |
| 1728 // First uncommit the memory. | |
| 1729 _g1_storage.shrink_by(diff_bytes); | |
| 1730 // Then propagate this update to the necessary data structures. | |
| 1731 update_committed_space(new_end, mr.end()); | |
|
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1732 } |
| 3766 | 1733 _free_list.add_as_tail(&expansion_list); |
|
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1734 |
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1735 if (_hr_printer.is_active()) { |
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1736 HeapWord* curr = mr.start(); |
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1737 while (curr < mr.end()) { |
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1738 HeapWord* curr_end = curr + HeapRegion::GrainWords; |
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1739 _hr_printer.commit(curr, curr_end); |
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1740 curr = curr_end; |
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1741 } |
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1742 assert(curr == mr.end(), "post-condition"); |
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1743 } |
|
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1744 g1_policy()->record_new_heap_size(n_regions()); |
|
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1745 } else { |
|
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1746 ergo_verbose0(ErgoHeapSizing, |
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1747 "did not expand the heap", |
|
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1748 ergo_format_reason("heap expansion operation failed")); |
|
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1749 // The expansion of the virtual storage space was unsuccessful. |
|
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1750 // Let's see if it was because we ran out of swap. |
|
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1751 if (G1ExitOnExpansionFailure && |
|
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1752 _g1_storage.uncommitted_size() >= aligned_expand_bytes) { |
|
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1753 // We had head room... |
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1754 vm_exit_out_of_memory(aligned_expand_bytes, "G1 heap expansion"); |
| 342 | 1755 } |
| 1756 } | |
|
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1757 return successful; |
| 342 | 1758 } |
| 1759 | |
| 3766 | 1760 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) { |
| 342 | 1761 size_t old_mem_size = _g1_storage.committed_size(); |
| 1762 size_t aligned_shrink_bytes = | |
| 1763 ReservedSpace::page_align_size_down(shrink_bytes); | |
| 1764 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
| 1765 HeapRegion::GrainBytes); | |
| 1766 size_t num_regions_deleted = 0; | |
| 3766 | 1767 MemRegion mr = _hrs.shrink_by(aligned_shrink_bytes, &num_regions_deleted); |
| 1768 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
| 1769 assert(mr.end() == old_end, "post-condition"); | |
|
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1770 |
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1771 ergo_verbose3(ErgoHeapSizing, |
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1772 "shrink the heap", |
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1773 ergo_format_byte("requested shrinking amount") |
|
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1774 ergo_format_byte("aligned shrinking amount") |
|
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1775 ergo_format_byte("attempted shrinking amount"), |
|
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1776 shrink_bytes, aligned_shrink_bytes, mr.byte_size()); |
| 3766 | 1777 if (mr.byte_size() > 0) { |
|
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1778 if (_hr_printer.is_active()) { |
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1779 HeapWord* curr = mr.end(); |
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1780 while (curr > mr.start()) { |
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1781 HeapWord* curr_end = curr; |
|
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1782 curr -= HeapRegion::GrainWords; |
|
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1783 _hr_printer.uncommit(curr, curr_end); |
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1784 } |
|
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1785 assert(curr == mr.start(), "post-condition"); |
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1786 } |
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1787 |
| 342 | 1788 _g1_storage.shrink_by(mr.byte_size()); |
| 3766 | 1789 HeapWord* new_end = (HeapWord*) _g1_storage.high(); |
| 1790 assert(mr.start() == new_end, "post-condition"); | |
| 1791 | |
| 1792 _expansion_regions += num_regions_deleted; | |
| 1793 update_committed_space(old_end, new_end); | |
| 1794 HeapRegionRemSet::shrink_heap(n_regions()); | |
|
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1795 g1_policy()->record_new_heap_size(n_regions()); |
|
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1796 } else { |
|
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1797 ergo_verbose0(ErgoHeapSizing, |
|
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1798 "did not shrink the heap", |
|
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1799 ergo_format_reason("heap shrinking operation failed")); |
| 342 | 1800 } |
| 1801 } | |
| 1802 | |
| 1803 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
| 2152 | 1804 verify_region_sets_optional(); |
| 1805 | |
|
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1806 // We should only reach here at the end of a Full GC which means we |
|
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1807 // should not not be holding to any GC alloc regions. The method |
|
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1808 // below will make sure of that and do any remaining clean up. |
|
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1809 abandon_gc_alloc_regions(); |
|
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1810 |
| 2152 | 1811 // Instead of tearing down / rebuilding the free lists here, we |
| 1812 // could instead use the remove_all_pending() method on free_list to | |
| 1813 // remove only the ones that we need to remove. | |
| 4072 | 1814 tear_down_region_sets(true /* free_list_only */); |
| 342 | 1815 shrink_helper(shrink_bytes); |
| 4072 | 1816 rebuild_region_sets(true /* free_list_only */); |
| 2152 | 1817 |
| 3766 | 1818 _hrs.verify_optional(); |
| 2152 | 1819 verify_region_sets_optional(); |
| 342 | 1820 } |
| 1821 | |
| 1822 // Public methods. | |
| 1823 | |
| 1824 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 1825 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 1826 #endif // _MSC_VER | |
| 1827 | |
| 1828 | |
| 1829 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
| 1830 SharedHeap(policy_), | |
| 1831 _g1_policy(policy_), | |
| 1111 | 1832 _dirty_card_queue_set(false), |
| 1705 | 1833 _into_cset_dirty_card_queue_set(false), |
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1834 _is_alive_closure_cm(this), |
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1835 _is_alive_closure_stw(this), |
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1836 _ref_processor_cm(NULL), |
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1837 _ref_processor_stw(NULL), |
| 342 | 1838 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), |
| 1839 _bot_shared(NULL), | |
| 1840 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
| 1841 _evac_failure_scan_stack(NULL) , | |
| 1842 _mark_in_progress(false), | |
| 2152 | 1843 _cg1r(NULL), _summary_bytes_used(0), |
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1844 _g1mm(NULL), |
| 342 | 1845 _refine_cte_cl(NULL), |
| 1846 _full_collection(false), | |
| 2152 | 1847 _free_list("Master Free List"), |
| 1848 _secondary_free_list("Secondary Free List"), | |
| 4072 | 1849 _old_set("Old Set"), |
| 2152 | 1850 _humongous_set("Master Humongous Set"), |
| 1851 _free_regions_coming(false), | |
| 342 | 1852 _young_list(new YoungList(this)), |
| 1853 _gc_time_stamp(0), | |
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1854 _retained_old_gc_alloc_region(NULL), |
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1855 _expand_heap_after_alloc_failure(true), |
| 526 | 1856 _surviving_young_words(NULL), |
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1857 _full_collections_completed(0), |
| 526 | 1858 _in_cset_fast_test(NULL), |
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1859 _in_cset_fast_test_base(NULL), |
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1860 _dirty_cards_region_list(NULL), |
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1861 _worker_cset_start_region(NULL), |
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1862 _worker_cset_start_region_time_stamp(NULL) { |
| 342 | 1863 _g1h = this; // To catch bugs. |
| 1864 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
| 1865 vm_exit_during_initialization("Failed necessary allocation."); | |
| 1866 } | |
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1867 |
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1868 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1869 |
| 342 | 1870 int n_queues = MAX2((int)ParallelGCThreads, 1); |
| 1871 _task_queues = new RefToScanQueueSet(n_queues); | |
| 1872 | |
| 1873 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
| 1874 assert(n_rem_sets > 0, "Invariant."); | |
| 1875 | |
| 1876 HeapRegionRemSetIterator** iter_arr = | |
| 1877 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
| 1878 for (int i = 0; i < n_queues; i++) { | |
| 1879 iter_arr[i] = new HeapRegionRemSetIterator(); | |
| 1880 } | |
| 1881 _rem_set_iterator = iter_arr; | |
| 1882 | |
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1883 _worker_cset_start_region = NEW_C_HEAP_ARRAY(HeapRegion*, n_queues); |
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1884 _worker_cset_start_region_time_stamp = NEW_C_HEAP_ARRAY(unsigned int, n_queues); |
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1885 |
| 342 | 1886 for (int i = 0; i < n_queues; i++) { |
| 1887 RefToScanQueue* q = new RefToScanQueue(); | |
| 1888 q->initialize(); | |
| 1889 _task_queues->register_queue(i, q); | |
| 1890 } | |
| 1891 | |
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1892 clear_cset_start_regions(); |
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1893 |
| 342 | 1894 guarantee(_task_queues != NULL, "task_queues allocation failure."); |
| 1895 } | |
| 1896 | |
| 1897 jint G1CollectedHeap::initialize() { | |
| 1166 | 1898 CollectedHeap::pre_initialize(); |
| 342 | 1899 os::enable_vtime(); |
| 1900 | |
| 1901 // Necessary to satisfy locking discipline assertions. | |
| 1902 | |
| 1903 MutexLocker x(Heap_lock); | |
| 1904 | |
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1905 // We have to initialize the printer before committing the heap, as |
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1906 // it will be used then. |
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1907 _hr_printer.set_active(G1PrintHeapRegions); |
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1908 |
| 342 | 1909 // While there are no constraints in the GC code that HeapWordSize |
| 1910 // be any particular value, there are multiple other areas in the | |
| 1911 // system which believe this to be true (e.g. oop->object_size in some | |
| 1912 // cases incorrectly returns the size in wordSize units rather than | |
| 1913 // HeapWordSize). | |
| 1914 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
| 1915 | |
| 1916 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
| 1917 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
| 1918 | |
| 1919 // Ensure that the sizes are properly aligned. | |
| 1920 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1921 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1922 | |
| 1923 _cg1r = new ConcurrentG1Refine(); | |
| 1924 | |
| 1925 // Reserve the maximum. | |
| 1926 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
| 1927 // Includes the perm-gen. | |
|
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1928 |
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1929 // When compressed oops are enabled, the preferred heap base |
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1930 // is calculated by subtracting the requested size from the |
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1931 // 32Gb boundary and using the result as the base address for |
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1932 // heap reservation. If the requested size is not aligned to |
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1933 // HeapRegion::GrainBytes (i.e. the alignment that is passed |
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1934 // into the ReservedHeapSpace constructor) then the actual |
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1935 // base of the reserved heap may end up differing from the |
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1936 // address that was requested (i.e. the preferred heap base). |
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1937 // If this happens then we could end up using a non-optimal |
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1938 // compressed oops mode. |
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1939 |
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1940 // Since max_byte_size is aligned to the size of a heap region (checked |
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1941 // above), we also need to align the perm gen size as it might not be. |
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1942 const size_t total_reserved = max_byte_size + |
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1943 align_size_up(pgs->max_size(), HeapRegion::GrainBytes); |
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1944 Universe::check_alignment(total_reserved, HeapRegion::GrainBytes, "g1 heap and perm"); |
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1945 |
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1946 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1947 |
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1948 ReservedHeapSpace heap_rs(total_reserved, HeapRegion::GrainBytes, |
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1949 UseLargePages, addr); |
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1950 |
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1951 if (UseCompressedOops) { |
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1952 if (addr != NULL && !heap_rs.is_reserved()) { |
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1953 // Failed to reserve at specified address - the requested memory |
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1954 // region is taken already, for example, by 'java' launcher. |
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1955 // Try again to reserver heap higher. |
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1956 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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1957 |
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1958 ReservedHeapSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1959 UseLargePages, addr); |
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1960 |
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1961 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1962 // Failed to reserve at specified address again - give up. |
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1963 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1964 assert(addr == NULL, ""); |
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1965 |
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1966 ReservedHeapSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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1967 UseLargePages, addr); |
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1968 heap_rs = heap_rs1; |
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1969 } else { |
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1970 heap_rs = heap_rs0; |
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1971 } |
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1972 } |
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1973 } |
| 342 | 1974 |
| 1975 if (!heap_rs.is_reserved()) { | |
| 1976 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
| 1977 return JNI_ENOMEM; | |
| 1978 } | |
| 1979 | |
| 1980 // It is important to do this in a way such that concurrent readers can't | |
| 1981 // temporarily think somethings in the heap. (I've actually seen this | |
| 1982 // happen in asserts: DLD.) | |
| 1983 _reserved.set_word_size(0); | |
| 1984 _reserved.set_start((HeapWord*)heap_rs.base()); | |
| 1985 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 1986 | |
| 1987 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
| 1988 | |
| 1989 // Create the gen rem set (and barrier set) for the entire reserved region. | |
| 1990 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
| 1991 set_barrier_set(rem_set()->bs()); | |
| 1992 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
| 1993 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
| 1994 } else { | |
| 1995 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
| 1996 return JNI_ENOMEM; | |
| 1997 } | |
| 1998 | |
| 1999 // Also create a G1 rem set. | |
| 1861 | 2000 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { |
| 2001 _g1_rem_set = new G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
| 342 | 2002 } else { |
| 1861 | 2003 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); |
| 2004 return JNI_ENOMEM; | |
| 342 | 2005 } |
| 2006 | |
| 2007 // Carve out the G1 part of the heap. | |
| 2008 | |
| 2009 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
| 2010 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
| 2011 g1_rs.size()/HeapWordSize); | |
| 2012 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
| 2013 | |
| 2014 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
| 2015 | |
| 2016 _g1_storage.initialize(g1_rs, 0); | |
| 2017 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
| 3766 | 2018 _hrs.initialize((HeapWord*) _g1_reserved.start(), |
| 2019 (HeapWord*) _g1_reserved.end(), | |
| 2020 _expansion_regions); | |
| 342 | 2021 |
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2022 // 6843694 - ensure that the maximum region index can fit |
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2023 // in the remembered set structures. |
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2024 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
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2025 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
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2026 |
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2027 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
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2028 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
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2029 guarantee(HeapRegion::CardsPerRegion < max_cards_per_region, |
|
942
2c79770d1f6e
6819085: G1: use larger and/or user settable region size
tonyp
parents:
941
diff
changeset
|
2030 "too many cards per region"); |
|
807
d44bdab1c03d
6843694: G1: assert(index < _vs.committed_size(),"bad index"), g1BlockOffsetTable.inline.hpp:55
johnc
parents:
796
diff
changeset
|
2031 |
| 2152 | 2032 HeapRegionSet::set_unrealistically_long_length(max_regions() + 1); |
| 2033 | |
| 342 | 2034 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
| 2035 heap_word_size(init_byte_size)); | |
| 2036 | |
| 2037 _g1h = this; | |
| 2038 | |
|
1394
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
|
2039 _in_cset_fast_test_length = max_regions(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2040 _in_cset_fast_test_base = NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2041 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2042 // We're biasing _in_cset_fast_test to avoid subtracting the |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2043 // beginning of the heap every time we want to index; basically |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2044 // it's the same with what we do with the card table. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2045 _in_cset_fast_test = _in_cset_fast_test_base - |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2046 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2047 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2048 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2049 // regions to the incremental collection set for the first |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
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|
2050 // evacuation pause. |
|
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
|
2051 clear_cset_fast_test(); |
|
1316cec51b4d
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diff
changeset
|
2052 |
| 342 | 2053 // Create the ConcurrentMark data structure and thread. |
| 2054 // (Must do this late, so that "max_regions" is defined.) | |
| 2055 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
| 2056 _cmThread = _cm->cmThread(); | |
| 2057 | |
| 2058 // Initialize the from_card cache structure of HeapRegionRemSet. | |
| 2059 HeapRegionRemSet::init_heap(max_regions()); | |
| 2060 | |
| 677 | 2061 // Now expand into the initial heap size. |
|
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
2062 if (!expand(init_byte_size)) { |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
2063 vm_exit_during_initialization("Failed to allocate initial heap."); |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
2064 return JNI_ENOMEM; |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
2065 } |
| 342 | 2066 |
| 2067 // Perform any initialization actions delegated to the policy. | |
| 2068 g1_policy()->init(); | |
| 2069 | |
| 2070 _refine_cte_cl = | |
| 2071 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
| 2072 g1_rem_set(), | |
| 2073 concurrent_g1_refine()); | |
| 2074 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 2075 | |
| 2076 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
| 2077 SATB_Q_FL_lock, | |
| 1111 | 2078 G1SATBProcessCompletedThreshold, |
| 342 | 2079 Shared_SATB_Q_lock); |
| 794 | 2080 |
| 2081 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
| 2082 DirtyCardQ_FL_lock, | |
| 1111 | 2083 concurrent_g1_refine()->yellow_zone(), |
| 2084 concurrent_g1_refine()->red_zone(), | |
| 794 | 2085 Shared_DirtyCardQ_lock); |
| 2086 | |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
2087 if (G1DeferredRSUpdate) { |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
2088 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
2089 DirtyCardQ_FL_lock, |
| 1111 | 2090 -1, // never trigger processing |
| 2091 -1, // no limit on length | |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
2092 Shared_DirtyCardQ_lock, |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
2093 &JavaThread::dirty_card_queue_set()); |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
2094 } |
| 1705 | 2095 |
| 2096 // Initialize the card queue set used to hold cards containing | |
| 2097 // references into the collection set. | |
| 2098 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
| 2099 DirtyCardQ_FL_lock, | |
| 2100 -1, // never trigger processing | |
| 2101 -1, // no limit on length | |
| 2102 Shared_DirtyCardQ_lock, | |
| 2103 &JavaThread::dirty_card_queue_set()); | |
| 2104 | |
| 342 | 2105 // In case we're keeping closure specialization stats, initialize those |
| 2106 // counts and that mechanism. | |
| 2107 SpecializationStats::clear(); | |
| 2108 | |
| 2109 // Do later initialization work for concurrent refinement. | |
| 2110 _cg1r->init(); | |
| 2111 | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2112 // Here we allocate the dummy full region that is required by the |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2113 // G1AllocRegion class. If we don't pass an address in the reserved |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2114 // space here, lots of asserts fire. |
| 3766 | 2115 |
| 2116 HeapRegion* dummy_region = new_heap_region(0 /* index of bottom region */, | |
| 2117 _g1_reserved.start()); | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2118 // We'll re-use the same region whether the alloc region will |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2119 // require BOT updates or not and, if it doesn't, then a non-young |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2120 // region will complain that it cannot support allocations without |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2121 // BOT updates. So we'll tag the dummy region as young to avoid that. |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2122 dummy_region->set_young(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2123 // Make sure it's full. |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2124 dummy_region->set_top(dummy_region->end()); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2125 G1AllocRegion::setup(this, dummy_region); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2126 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2127 init_mutator_alloc_region(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2128 |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
2129 // Do create of the monitoring and management support so that |
|
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
2130 // values in the heap have been properly initialized. |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
2131 _g1mm = new G1MonitoringSupport(this); |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
2132 |
| 342 | 2133 return JNI_OK; |
| 2134 } | |
| 2135 | |
| 2136 void G1CollectedHeap::ref_processing_init() { | |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2137 // Reference processing in G1 currently works as follows: |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2138 // |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2139 // * There are two reference processor instances. One is |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2140 // used to record and process discovered references |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2141 // during concurrent marking; the other is used to |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2142 // record and process references during STW pauses |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2143 // (both full and incremental). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2144 // * Both ref processors need to 'span' the entire heap as |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2145 // the regions in the collection set may be dotted around. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2146 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2147 // * For the concurrent marking ref processor: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2148 // * Reference discovery is enabled at initial marking. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2149 // * Reference discovery is disabled and the discovered |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2150 // references processed etc during remarking. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2151 // * Reference discovery is MT (see below). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2152 // * Reference discovery requires a barrier (see below). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2153 // * Reference processing may or may not be MT |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2154 // (depending on the value of ParallelRefProcEnabled |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2155 // and ParallelGCThreads). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2156 // * A full GC disables reference discovery by the CM |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2157 // ref processor and abandons any entries on it's |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2158 // discovered lists. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2159 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2160 // * For the STW processor: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2161 // * Non MT discovery is enabled at the start of a full GC. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2162 // * Processing and enqueueing during a full GC is non-MT. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2163 // * During a full GC, references are processed after marking. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2164 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2165 // * Discovery (may or may not be MT) is enabled at the start |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2166 // of an incremental evacuation pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2167 // * References are processed near the end of a STW evacuation pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2168 // * For both types of GC: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2169 // * Discovery is atomic - i.e. not concurrent. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2170 // * Reference discovery will not need a barrier. |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2171 |
| 342 | 2172 SharedHeap::ref_processing_init(); |
| 2173 MemRegion mr = reserved_region(); | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2174 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2175 // Concurrent Mark ref processor |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2176 _ref_processor_cm = |
|
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2361
diff
changeset
|
2177 new ReferenceProcessor(mr, // span |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2178 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2179 // mt processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2180 (int) ParallelGCThreads, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2181 // degree of mt processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2182 (ParallelGCThreads > 1) || (ConcGCThreads > 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2183 // mt discovery |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2184 (int) MAX2(ParallelGCThreads, ConcGCThreads), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2185 // degree of mt discovery |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2186 false, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2187 // Reference discovery is not atomic |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2188 &_is_alive_closure_cm, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2189 // is alive closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2190 // (for efficiency/performance) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2191 true); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2192 // Setting next fields of discovered |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2193 // lists requires a barrier. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2194 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2195 // STW ref processor |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2196 _ref_processor_stw = |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2197 new ReferenceProcessor(mr, // span |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2198 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2199 // mt processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2200 MAX2((int)ParallelGCThreads, 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
2201 // degree of mt processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2202 (ParallelGCThreads > 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2203 // mt discovery |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2204 MAX2((int)ParallelGCThreads, 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2205 // degree of mt discovery |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2206 true, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2207 // Reference discovery is atomic |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2208 &_is_alive_closure_stw, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2209 // is alive closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2210 // (for efficiency/performance) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2211 false); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2212 // Setting next fields of discovered |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2213 // lists requires a barrier. |
| 342 | 2214 } |
| 2215 | |
| 2216 size_t G1CollectedHeap::capacity() const { | |
| 2217 return _g1_committed.byte_size(); | |
| 2218 } | |
| 2219 | |
| 1705 | 2220 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
| 2221 DirtyCardQueue* into_cset_dcq, | |
| 2222 bool concurrent, | |
| 342 | 2223 int worker_i) { |
| 889 | 2224 // Clean cards in the hot card cache |
| 1705 | 2225 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set(), into_cset_dcq); |
| 889 | 2226 |
| 342 | 2227 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
| 2228 int n_completed_buffers = 0; | |
| 1705 | 2229 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
| 342 | 2230 n_completed_buffers++; |
| 2231 } | |
| 2232 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
| 2233 (double) n_completed_buffers); | |
| 2234 dcqs.clear_n_completed_buffers(); | |
| 2235 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
| 2236 } | |
| 2237 | |
| 2238 | |
| 2239 // Computes the sum of the storage used by the various regions. | |
| 2240 | |
| 2241 size_t G1CollectedHeap::used() const { | |
|
862
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
ysr
parents:
861
diff
changeset
|
2242 assert(Heap_lock->owner() != NULL, |
|
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
ysr
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861
diff
changeset
|
2243 "Should be owned on this thread's behalf."); |
| 342 | 2244 size_t result = _summary_bytes_used; |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2245 // Read only once in case it is set to NULL concurrently |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2246 HeapRegion* hr = _mutator_alloc_region.get(); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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838
diff
changeset
|
2247 if (hr != NULL) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2248 result += hr->used(); |
| 342 | 2249 return result; |
| 2250 } | |
| 2251 | |
|
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2252 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
|
2253 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
|
2254 return result; |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2255 } |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2256 |
| 342 | 2257 class SumUsedClosure: public HeapRegionClosure { |
| 2258 size_t _used; | |
| 2259 public: | |
| 2260 SumUsedClosure() : _used(0) {} | |
| 2261 bool doHeapRegion(HeapRegion* r) { | |
| 2262 if (!r->continuesHumongous()) { | |
| 2263 _used += r->used(); | |
| 2264 } | |
| 2265 return false; | |
| 2266 } | |
| 2267 size_t result() { return _used; } | |
| 2268 }; | |
| 2269 | |
| 2270 size_t G1CollectedHeap::recalculate_used() const { | |
| 2271 SumUsedClosure blk; | |
| 3766 | 2272 heap_region_iterate(&blk); |
| 342 | 2273 return blk.result(); |
| 2274 } | |
| 2275 | |
| 2276 size_t G1CollectedHeap::unsafe_max_alloc() { | |
| 2152 | 2277 if (free_regions() > 0) return HeapRegion::GrainBytes; |
| 342 | 2278 // otherwise, is there space in the current allocation region? |
| 2279 | |
| 2280 // We need to store the current allocation region in a local variable | |
| 2281 // here. The problem is that this method doesn't take any locks and | |
| 2282 // there may be other threads which overwrite the current allocation | |
| 2283 // region field. attempt_allocation(), for example, sets it to NULL | |
| 2284 // and this can happen *after* the NULL check here but before the call | |
| 2285 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
| 2286 // to be a problem in the optimized build, since the two loads of the | |
| 2287 // current allocation region field are optimized away. | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2288 HeapRegion* hr = _mutator_alloc_region.get(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2289 if (hr == NULL) { |
| 342 | 2290 return 0; |
| 2291 } | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2292 return hr->free(); |
| 342 | 2293 } |
| 2294 | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2295 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
|
2296 return |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2297 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2298 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2299 } |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2300 |
|
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2301 #ifndef PRODUCT |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2302 void G1CollectedHeap::allocate_dummy_regions() { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2303 // Let's fill up most of the region |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2304 size_t word_size = HeapRegion::GrainWords - 1024; |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2305 // 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
|
2306 guarantee(isHumongous(word_size), "sanity"); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2307 |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2308 for (uintx i = 0; i < G1DummyRegionsPerGC; ++i) { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2309 // 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
|
2310 HeapWord* dummy_obj = humongous_obj_allocate(word_size); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2311 if (dummy_obj != NULL) { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2312 MemRegion mr(dummy_obj, word_size); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2313 CollectedHeap::fill_with_object(mr); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2314 } else { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2315 // 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
|
2316 // again. Let's get out of the loop. |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2317 break; |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2318 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2319 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2320 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2321 #endif // !PRODUCT |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2322 |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2323 void G1CollectedHeap::increment_full_collections_completed(bool concurrent) { |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2324 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2325 |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2326 // 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
|
2327 // 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
|
2328 // 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
|
2329 // assert here. |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2330 |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2331 // 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
|
2332 // 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
|
2333 // collections have been started. |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2334 unsigned int full_collections_started = total_full_collections(); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2335 |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2336 // 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
|
2337 // 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
|
2338 // interrupt a concurrent cycle), the number of full collections |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2339 // 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
|
2340 // 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
|
2341 // behind the number of full collections started. |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2342 |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2343 // 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
|
2344 assert(concurrent || |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2345 (full_collections_started == _full_collections_completed + 1) || |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2346 (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
|
2347 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
|
2348 "is inconsistent with _full_collections_completed = %u", |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2349 full_collections_started, _full_collections_completed)); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2350 |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2351 // 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
|
2352 assert(!concurrent || |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2353 (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
|
2354 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
|
2355 "full_collections_started = %u " |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2356 "is inconsistent with _full_collections_completed = %u", |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2357 full_collections_started, _full_collections_completed)); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2358 |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2359 _full_collections_completed += 1; |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2360 |
|
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2361 // 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
|
2362 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2363 // 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
|
2364 // 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
|
2365 if (concurrent) { |
|
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2366 _cmThread->clear_in_progress(); |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2367 } |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2368 |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2369 // This notify_all() will ensure that a thread that called |
|
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2370 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
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2371 // and it's waiting for a full GC to finish will be woken up. It is |
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2372 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
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2373 FullGCCount_lock->notify_all(); |
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2374 } |
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2375 |
| 342 | 2376 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
| 2152 | 2377 assert_at_safepoint(true /* should_be_vm_thread */); |
| 342 | 2378 GCCauseSetter gcs(this, cause); |
| 2379 switch (cause) { | |
| 2380 case GCCause::_heap_inspection: | |
| 2381 case GCCause::_heap_dump: { | |
| 2382 HandleMark hm; | |
| 2383 do_full_collection(false); // don't clear all soft refs | |
| 2384 break; | |
| 2385 } | |
| 2386 default: // XXX FIX ME | |
| 2387 ShouldNotReachHere(); // Unexpected use of this function | |
| 2388 } | |
| 2389 } | |
| 2390 | |
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2391 void G1CollectedHeap::collect(GCCause::Cause cause) { |
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2392 // The caller doesn't have the Heap_lock |
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2393 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
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2394 |
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2395 unsigned int gc_count_before; |
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2396 unsigned int full_gc_count_before; |
| 342 | 2397 { |
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2398 MutexLocker ml(Heap_lock); |
| 1973 | 2399 |
|
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2400 // Read the GC count while holding the Heap_lock |
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2401 gc_count_before = SharedHeap::heap()->total_collections(); |
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2402 full_gc_count_before = SharedHeap::heap()->total_full_collections(); |
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2403 } |
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2404 |
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2405 if (should_do_concurrent_full_gc(cause)) { |
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2406 // Schedule an initial-mark evacuation pause that will start a |
| 1973 | 2407 // concurrent cycle. We're setting word_size to 0 which means that |
| 2408 // we are not requesting a post-GC allocation. | |
|
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2409 VM_G1IncCollectionPause op(gc_count_before, |
| 1973 | 2410 0, /* word_size */ |
| 2411 true, /* should_initiate_conc_mark */ | |
|
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2412 g1_policy()->max_pause_time_ms(), |
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2413 cause); |
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2414 VMThread::execute(&op); |
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2415 } else { |
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2416 if (cause == GCCause::_gc_locker |
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2417 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
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2418 |
| 1973 | 2419 // Schedule a standard evacuation pause. We're setting word_size |
| 2420 // to 0 which means that we are not requesting a post-GC allocation. | |
|
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2421 VM_G1IncCollectionPause op(gc_count_before, |
| 1973 | 2422 0, /* word_size */ |
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2423 false, /* should_initiate_conc_mark */ |
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2424 g1_policy()->max_pause_time_ms(), |
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2425 cause); |
|
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2426 VMThread::execute(&op); |
|
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2427 } else { |
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2428 // Schedule a Full GC. |
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2429 VM_G1CollectFull op(gc_count_before, full_gc_count_before, cause); |
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2430 VMThread::execute(&op); |
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2431 } |
| 342 | 2432 } |
| 2433 } | |
| 2434 | |
| 2435 bool G1CollectedHeap::is_in(const void* p) const { | |
| 4708 | 2436 if (_g1_committed.contains(p)) { |
| 2437 // Given that we know that p is in the committed space, | |
| 2438 // heap_region_containing_raw() should successfully | |
| 2439 // return the containing region. | |
| 2440 HeapRegion* hr = heap_region_containing_raw(p); | |
| 342 | 2441 return hr->is_in(p); |
| 2442 } else { | |
| 2443 return _perm_gen->as_gen()->is_in(p); | |
| 2444 } | |
| 2445 } | |
| 2446 | |
| 2447 // Iteration functions. | |
| 2448 | |
| 2449 // Iterates an OopClosure over all ref-containing fields of objects | |
| 2450 // within a HeapRegion. | |
| 2451 | |
| 2452 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
| 2453 MemRegion _mr; | |
| 2454 OopClosure* _cl; | |
| 2455 public: | |
| 2456 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
| 2457 : _mr(mr), _cl(cl) {} | |
| 2458 bool doHeapRegion(HeapRegion* r) { | |
| 2459 if (! r->continuesHumongous()) { | |
| 2460 r->oop_iterate(_cl); | |
| 2461 } | |
| 2462 return false; | |
| 2463 } | |
| 2464 }; | |
| 2465 | |
| 678 | 2466 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
| 342 | 2467 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
| 3766 | 2468 heap_region_iterate(&blk); |
| 678 | 2469 if (do_perm) { |
| 2470 perm_gen()->oop_iterate(cl); | |
| 2471 } | |
| 342 | 2472 } |
| 2473 | |
| 678 | 2474 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
| 342 | 2475 IterateOopClosureRegionClosure blk(mr, cl); |
| 3766 | 2476 heap_region_iterate(&blk); |
| 678 | 2477 if (do_perm) { |
| 2478 perm_gen()->oop_iterate(cl); | |
| 2479 } | |
| 342 | 2480 } |
| 2481 | |
| 2482 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
| 2483 | |
| 2484 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
| 2485 ObjectClosure* _cl; | |
| 2486 public: | |
| 2487 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
| 2488 bool doHeapRegion(HeapRegion* r) { | |
| 2489 if (! r->continuesHumongous()) { | |
| 2490 r->object_iterate(_cl); | |
| 2491 } | |
| 2492 return false; | |
| 2493 } | |
| 2494 }; | |
| 2495 | |
| 678 | 2496 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
| 342 | 2497 IterateObjectClosureRegionClosure blk(cl); |
| 3766 | 2498 heap_region_iterate(&blk); |
| 678 | 2499 if (do_perm) { |
| 2500 perm_gen()->object_iterate(cl); | |
| 2501 } | |
| 342 | 2502 } |
| 2503 | |
| 2504 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
| 2505 // FIXME: is this right? | |
| 2506 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
| 2507 } | |
| 2508 | |
| 2509 // Calls a SpaceClosure on a HeapRegion. | |
| 2510 | |
| 2511 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
| 2512 SpaceClosure* _cl; | |
| 2513 public: | |
| 2514 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
| 2515 bool doHeapRegion(HeapRegion* r) { | |
| 2516 _cl->do_space(r); | |
| 2517 return false; | |
| 2518 } | |
| 2519 }; | |
| 2520 | |
| 2521 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
| 2522 SpaceClosureRegionClosure blk(cl); | |
| 3766 | 2523 heap_region_iterate(&blk); |
| 342 | 2524 } |
| 2525 | |
| 3766 | 2526 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const { |
| 2527 _hrs.iterate(cl); | |
| 342 | 2528 } |
| 2529 | |
| 2530 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
| 3766 | 2531 HeapRegionClosure* cl) const { |
| 2532 _hrs.iterate_from(r, cl); | |
| 342 | 2533 } |
| 2534 | |
| 2535 void | |
| 2536 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
|
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2537 uint worker, |
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2538 uint no_of_par_workers, |
| 342 | 2539 jint claim_value) { |
| 355 | 2540 const size_t regions = n_regions(); |
|
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2541 const uint max_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
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2542 no_of_par_workers : |
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2543 1); |
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2544 assert(UseDynamicNumberOfGCThreads || |
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2545 no_of_par_workers == workers()->total_workers(), |
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2546 "Non dynamic should use fixed number of workers"); |
| 355 | 2547 // try to spread out the starting points of the workers |
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2548 const size_t start_index = regions / max_workers * (size_t) worker; |
| 355 | 2549 |
| 2550 // each worker will actually look at all regions | |
| 2551 for (size_t count = 0; count < regions; ++count) { | |
| 2552 const size_t index = (start_index + count) % regions; | |
| 2553 assert(0 <= index && index < regions, "sanity"); | |
| 2554 HeapRegion* r = region_at(index); | |
| 2555 // we'll ignore "continues humongous" regions (we'll process them | |
| 2556 // when we come across their corresponding "start humongous" | |
| 2557 // region) and regions already claimed | |
| 2558 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
| 2559 continue; | |
| 2560 } | |
| 2561 // OK, try to claim it | |
| 342 | 2562 if (r->claimHeapRegion(claim_value)) { |
| 355 | 2563 // success! |
| 2564 assert(!r->continuesHumongous(), "sanity"); | |
| 2565 if (r->startsHumongous()) { | |
| 2566 // If the region is "starts humongous" we'll iterate over its | |
| 2567 // "continues humongous" first; in fact we'll do them | |
| 2568 // first. The order is important. In on case, calling the | |
| 2569 // closure on the "starts humongous" region might de-allocate | |
| 2570 // and clear all its "continues humongous" regions and, as a | |
| 2571 // result, we might end up processing them twice. So, we'll do | |
| 2572 // them first (notice: most closures will ignore them anyway) and | |
| 2573 // then we'll do the "starts humongous" region. | |
| 2574 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
| 2575 HeapRegion* chr = region_at(ch_index); | |
| 2576 | |
| 2577 // if the region has already been claimed or it's not | |
| 2578 // "continues humongous" we're done | |
| 2579 if (chr->claim_value() == claim_value || | |
| 2580 !chr->continuesHumongous()) { | |
| 2581 break; | |
| 2582 } | |
| 2583 | |
| 2584 // Noone should have claimed it directly. We can given | |
| 2585 // that we claimed its "starts humongous" region. | |
| 2586 assert(chr->claim_value() != claim_value, "sanity"); | |
| 2587 assert(chr->humongous_start_region() == r, "sanity"); | |
| 2588 | |
| 2589 if (chr->claimHeapRegion(claim_value)) { | |
| 2590 // we should always be able to claim it; noone else should | |
| 2591 // be trying to claim this region | |
| 2592 | |
| 2593 bool res2 = cl->doHeapRegion(chr); | |
| 2594 assert(!res2, "Should not abort"); | |
| 2595 | |
| 2596 // Right now, this holds (i.e., no closure that actually | |
| 2597 // does something with "continues humongous" regions | |
| 2598 // clears them). We might have to weaken it in the future, | |
| 2599 // but let's leave these two asserts here for extra safety. | |
| 2600 assert(chr->continuesHumongous(), "should still be the case"); | |
| 2601 assert(chr->humongous_start_region() == r, "sanity"); | |
| 2602 } else { | |
| 2603 guarantee(false, "we should not reach here"); | |
| 2604 } | |
| 2605 } | |
| 2606 } | |
| 2607 | |
| 2608 assert(!r->continuesHumongous(), "sanity"); | |
| 2609 bool res = cl->doHeapRegion(r); | |
| 2610 assert(!res, "Should not abort"); | |
| 2611 } | |
| 2612 } | |
| 2613 } | |
| 2614 | |
| 390 | 2615 class ResetClaimValuesClosure: public HeapRegionClosure { |
| 2616 public: | |
| 2617 bool doHeapRegion(HeapRegion* r) { | |
| 2618 r->set_claim_value(HeapRegion::InitialClaimValue); | |
| 2619 return false; | |
| 2620 } | |
| 2621 }; | |
| 2622 | |
|
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2623 void G1CollectedHeap::reset_heap_region_claim_values() { |
| 390 | 2624 ResetClaimValuesClosure blk; |
| 2625 heap_region_iterate(&blk); | |
| 2626 } | |
| 2627 | |
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2628 void G1CollectedHeap::reset_cset_heap_region_claim_values() { |
|
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2629 ResetClaimValuesClosure blk; |
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2630 collection_set_iterate(&blk); |
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2631 } |
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2632 |
| 355 | 2633 #ifdef ASSERT |
| 2634 // This checks whether all regions in the heap have the correct claim | |
| 2635 // value. I also piggy-backed on this a check to ensure that the | |
| 2636 // humongous_start_region() information on "continues humongous" | |
| 2637 // regions is correct. | |
| 2638 | |
| 2639 class CheckClaimValuesClosure : public HeapRegionClosure { | |
| 2640 private: | |
| 2641 jint _claim_value; | |
| 2642 size_t _failures; | |
| 2643 HeapRegion* _sh_region; | |
| 2644 public: | |
| 2645 CheckClaimValuesClosure(jint claim_value) : | |
| 2646 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
| 2647 bool doHeapRegion(HeapRegion* r) { | |
| 2648 if (r->claim_value() != _claim_value) { | |
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2649 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
| 355 | 2650 "claim value = %d, should be %d", |
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2651 HR_FORMAT_PARAMS(r), |
|
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2652 r->claim_value(), _claim_value); |
| 355 | 2653 ++_failures; |
| 2654 } | |
| 2655 if (!r->isHumongous()) { | |
| 2656 _sh_region = NULL; | |
| 2657 } else if (r->startsHumongous()) { | |
| 2658 _sh_region = r; | |
| 2659 } else if (r->continuesHumongous()) { | |
| 2660 if (r->humongous_start_region() != _sh_region) { | |
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2661 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
| 355 | 2662 "HS = "PTR_FORMAT", should be "PTR_FORMAT, |
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2663 HR_FORMAT_PARAMS(r), |
| 355 | 2664 r->humongous_start_region(), |
| 2665 _sh_region); | |
| 2666 ++_failures; | |
| 342 | 2667 } |
| 2668 } | |
| 355 | 2669 return false; |
| 2670 } | |
| 2671 size_t failures() { | |
| 2672 return _failures; | |
| 2673 } | |
| 2674 }; | |
| 2675 | |
| 2676 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
| 2677 CheckClaimValuesClosure cl(claim_value); | |
| 2678 heap_region_iterate(&cl); | |
| 2679 return cl.failures() == 0; | |
| 2680 } | |
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|
2681 |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2682 class CheckClaimValuesInCSetHRClosure: public HeapRegionClosure { |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2683 jint _claim_value; |
|
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|
2684 size_t _failures; |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2685 |
|
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changeset
|
2686 public: |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2687 CheckClaimValuesInCSetHRClosure(jint claim_value) : |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2688 _claim_value(claim_value), |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2689 _failures(0) { } |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2690 |
|
dc467e8b2c5e
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|
2691 size_t failures() { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2692 return _failures; |
|
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changeset
|
2693 } |
|
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|
2694 |
|
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|
2695 bool doHeapRegion(HeapRegion* hr) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2696 assert(hr->in_collection_set(), "how?"); |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2697 assert(!hr->isHumongous(), "H-region in CSet"); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2698 if (hr->claim_value() != _claim_value) { |
|
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|
2699 gclog_or_tty->print_cr("CSet Region " HR_FORMAT ", " |
|
dc467e8b2c5e
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|
2700 "claim value = %d, should be %d", |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2701 HR_FORMAT_PARAMS(hr), |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2702 hr->claim_value(), _claim_value); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2703 _failures += 1; |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2704 } |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2705 return false; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
changeset
|
2706 } |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2707 }; |
|
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|
2708 |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2709 bool G1CollectedHeap::check_cset_heap_region_claim_values(jint claim_value) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2710 CheckClaimValuesInCSetHRClosure cl(claim_value); |
|
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|
2711 collection_set_iterate(&cl); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2712 return cl.failures() == 0; |
|
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|
2713 } |
| 355 | 2714 #endif // ASSERT |
| 342 | 2715 |
|
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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changeset
|
2716 // Clear the cached CSet starting regions and (more importantly) |
|
fd2b426c30db
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changeset
|
2717 // the time stamps. Called when we reset the GC time stamp. |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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changeset
|
2718 void G1CollectedHeap::clear_cset_start_regions() { |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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changeset
|
2719 assert(_worker_cset_start_region != NULL, "sanity"); |
|
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changeset
|
2720 assert(_worker_cset_start_region_time_stamp != NULL, "sanity"); |
|
fd2b426c30db
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|
2721 |
|
fd2b426c30db
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changeset
|
2722 int n_queues = MAX2((int)ParallelGCThreads, 1); |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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changeset
|
2723 for (int i = 0; i < n_queues; i++) { |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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changeset
|
2724 _worker_cset_start_region[i] = NULL; |
|
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parents:
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changeset
|
2725 _worker_cset_start_region_time_stamp[i] = 0; |
|
fd2b426c30db
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parents:
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changeset
|
2726 } |
|
fd2b426c30db
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parents:
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diff
changeset
|
2727 } |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2728 |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2729 // Given the id of a worker, obtain or calculate a suitable |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
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changeset
|
2730 // starting region for iterating over the current collection set. |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
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changeset
|
2731 HeapRegion* G1CollectedHeap::start_cset_region_for_worker(int worker_i) { |
|
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
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changeset
|
2732 assert(get_gc_time_stamp() > 0, "should have been updated by now"); |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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|
2733 |
|
fd2b426c30db
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diff
changeset
|
2734 HeapRegion* result = NULL; |
|
fd2b426c30db
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diff
changeset
|
2735 unsigned gc_time_stamp = get_gc_time_stamp(); |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2736 |
|
fd2b426c30db
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diff
changeset
|
2737 if (_worker_cset_start_region_time_stamp[worker_i] == gc_time_stamp) { |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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changeset
|
2738 // Cached starting region for current worker was set |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
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diff
changeset
|
2739 // during the current pause - so it's valid. |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
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diff
changeset
|
2740 // Note: the cached starting heap region may be NULL |
|
fd2b426c30db
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diff
changeset
|
2741 // (when the collection set is empty). |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
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diff
changeset
|
2742 result = _worker_cset_start_region[worker_i]; |
|
fd2b426c30db
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diff
changeset
|
2743 assert(result == NULL || result->in_collection_set(), "sanity"); |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
4708
diff
changeset
|
2744 return result; |
|
fd2b426c30db
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parents:
4708
diff
changeset
|
2745 } |
|
fd2b426c30db
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parents:
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diff
changeset
|
2746 |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
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diff
changeset
|
2747 // The cached entry was not valid so let's calculate |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2748 // a suitable starting heap region for this worker. |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2749 |
|
fd2b426c30db
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parents:
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diff
changeset
|
2750 // We want the parallel threads to start their collection |
|
fd2b426c30db
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parents:
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diff
changeset
|
2751 // set iteration at different collection set regions to |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2752 // avoid contention. |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2753 // If we have: |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2754 // n collection set regions |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2755 // p threads |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
4708
diff
changeset
|
2756 // Then thread t will start at region floor ((t * n) / p) |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2757 |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2758 result = g1_policy()->collection_set(); |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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changeset
|
2759 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
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4095
diff
changeset
|
2760 size_t cs_size = g1_policy()->cset_region_length(); |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2761 uint active_workers = workers()->active_workers(); |
|
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
4708
diff
changeset
|
2762 assert(UseDynamicNumberOfGCThreads || |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
4708
diff
changeset
|
2763 active_workers == workers()->total_workers(), |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2764 "Unless dynamic should use total workers"); |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2765 |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
4708
diff
changeset
|
2766 size_t end_ind = (cs_size * worker_i) / active_workers; |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
4708
diff
changeset
|
2767 size_t start_ind = 0; |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2768 |
|
fd2b426c30db
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4708
diff
changeset
|
2769 if (worker_i > 0 && |
|
fd2b426c30db
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parents:
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diff
changeset
|
2770 _worker_cset_start_region_time_stamp[worker_i - 1] == gc_time_stamp) { |
|
fd2b426c30db
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4708
diff
changeset
|
2771 // Previous workers starting region is valid |
|
fd2b426c30db
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diff
changeset
|
2772 // so let's iterate from there |
|
fd2b426c30db
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diff
changeset
|
2773 start_ind = (cs_size * (worker_i - 1)) / active_workers; |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2774 result = _worker_cset_start_region[worker_i - 1]; |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2775 } |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2776 |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2777 for (size_t i = start_ind; i < end_ind; i++) { |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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4095
diff
changeset
|
2778 result = result->next_in_collection_set(); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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4095
diff
changeset
|
2779 } |
|
dc467e8b2c5e
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4095
diff
changeset
|
2780 } |
|
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
4708
diff
changeset
|
2781 |
|
fd2b426c30db
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johnc
parents:
4708
diff
changeset
|
2782 // Note: the calculated starting heap region may be NULL |
|
fd2b426c30db
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4708
diff
changeset
|
2783 // (when the collection set is empty). |
|
fd2b426c30db
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johnc
parents:
4708
diff
changeset
|
2784 assert(result == NULL || result->in_collection_set(), "sanity"); |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
4708
diff
changeset
|
2785 assert(_worker_cset_start_region_time_stamp[worker_i] != gc_time_stamp, |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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4708
diff
changeset
|
2786 "should be updated only once per pause"); |
|
fd2b426c30db
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parents:
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diff
changeset
|
2787 _worker_cset_start_region[worker_i] = result; |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2788 OrderAccess::storestore(); |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2789 _worker_cset_start_region_time_stamp[worker_i] = gc_time_stamp; |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
4095
diff
changeset
|
2790 return result; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2791 } |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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4095
diff
changeset
|
2792 |
| 342 | 2793 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { |
| 2794 HeapRegion* r = g1_policy()->collection_set(); | |
| 2795 while (r != NULL) { | |
| 2796 HeapRegion* next = r->next_in_collection_set(); | |
| 2797 if (cl->doHeapRegion(r)) { | |
| 2798 cl->incomplete(); | |
| 2799 return; | |
| 2800 } | |
| 2801 r = next; | |
| 2802 } | |
| 2803 } | |
| 2804 | |
| 2805 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
| 2806 HeapRegionClosure *cl) { | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2807 if (r == NULL) { |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
changeset
|
2808 // The CSet is empty so there's nothing to do. |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2809 return; |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2810 } |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2811 |
| 342 | 2812 assert(r->in_collection_set(), |
| 2813 "Start region must be a member of the collection set."); | |
| 2814 HeapRegion* cur = r; | |
| 2815 while (cur != NULL) { | |
| 2816 HeapRegion* next = cur->next_in_collection_set(); | |
| 2817 if (cl->doHeapRegion(cur) && false) { | |
| 2818 cl->incomplete(); | |
| 2819 return; | |
| 2820 } | |
| 2821 cur = next; | |
| 2822 } | |
| 2823 cur = g1_policy()->collection_set(); | |
| 2824 while (cur != r) { | |
| 2825 HeapRegion* next = cur->next_in_collection_set(); | |
| 2826 if (cl->doHeapRegion(cur) && false) { | |
| 2827 cl->incomplete(); | |
| 2828 return; | |
| 2829 } | |
| 2830 cur = next; | |
| 2831 } | |
| 2832 } | |
| 2833 | |
| 2834 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
| 3766 | 2835 return n_regions() > 0 ? region_at(0) : NULL; |
| 342 | 2836 } |
| 2837 | |
| 2838 | |
| 2839 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
| 2840 Space* res = heap_region_containing(addr); | |
| 2841 if (res == NULL) | |
| 2842 res = perm_gen()->space_containing(addr); | |
| 2843 return res; | |
| 2844 } | |
| 2845 | |
| 2846 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
| 2847 Space* sp = space_containing(addr); | |
| 2848 if (sp != NULL) { | |
| 2849 return sp->block_start(addr); | |
| 2850 } | |
| 2851 return NULL; | |
| 2852 } | |
| 2853 | |
| 2854 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
| 2855 Space* sp = space_containing(addr); | |
| 2856 assert(sp != NULL, "block_size of address outside of heap"); | |
| 2857 return sp->block_size(addr); | |
| 2858 } | |
| 2859 | |
| 2860 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
| 2861 Space* sp = space_containing(addr); | |
| 2862 return sp->block_is_obj(addr); | |
| 2863 } | |
| 2864 | |
| 2865 bool G1CollectedHeap::supports_tlab_allocation() const { | |
| 2866 return true; | |
| 2867 } | |
| 2868 | |
| 2869 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
| 2870 return HeapRegion::GrainBytes; | |
| 2871 } | |
| 2872 | |
| 2873 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
| 2874 // Return the remaining space in the cur alloc region, but not less than | |
| 2875 // the min TLAB size. | |
|
1313
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|
2876 |
|
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|
2877 // Also, this value can be at most the humongous object threshold, |
|
664ae0c5e0e5
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|
2878 // since we can't allow tlabs to grow big enough to accomodate |
|
664ae0c5e0e5
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|
2879 // humongous objects. |
|
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|
2880 |
|
2433
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|
2881 HeapRegion* hr = _mutator_alloc_region.get(); |
|
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|
2882 size_t max_tlab_size = _humongous_object_threshold_in_words * wordSize; |
|
2433
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|
2883 if (hr == NULL) { |
|
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|
2884 return max_tlab_size; |
| 342 | 2885 } else { |
|
2433
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|
2886 return MIN2(MAX2(hr->free(), (size_t) MinTLABSize), max_tlab_size); |
| 342 | 2887 } |
| 2888 } | |
| 2889 | |
| 2890 size_t G1CollectedHeap::max_capacity() const { | |
|
2188
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6923430: G1: assert(res != 0,"This should have worked.")
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|
2891 return _g1_reserved.byte_size(); |
| 342 | 2892 } |
| 2893 | |
| 2894 jlong G1CollectedHeap::millis_since_last_gc() { | |
| 2895 // assert(false, "NYI"); | |
| 2896 return 0; | |
| 2897 } | |
| 2898 | |
| 2899 void G1CollectedHeap::prepare_for_verify() { | |
| 2900 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
| 2901 ensure_parsability(false); | |
| 2902 } | |
| 2903 g1_rem_set()->prepare_for_verify(); | |
| 2904 } | |
| 2905 | |
| 2906 class VerifyLivenessOopClosure: public OopClosure { | |
|
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|
2907 G1CollectedHeap* _g1h; |
|
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|
2908 VerifyOption _vo; |
| 342 | 2909 public: |
|
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|
2910 VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo): |
|
6747fd0512e0
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|
2911 _g1h(g1h), _vo(vo) |
|
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|
2912 { } |
|
845
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|
2913 void do_oop(narrowOop *p) { do_oop_work(p); } |
|
df6caf649ff7
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|
2914 void do_oop( oop *p) { do_oop_work(p); } |
|
df6caf649ff7
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|
2915 |
|
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|
2916 template <class T> void do_oop_work(T *p) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
2917 oop obj = oopDesc::load_decode_heap_oop(p); |
|
3772
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|
2918 guarantee(obj == NULL || !_g1h->is_obj_dead_cond(obj, _vo), |
|
845
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|
2919 "Dead object referenced by a not dead object"); |
| 342 | 2920 } |
| 2921 }; | |
| 2922 | |
| 2923 class VerifyObjsInRegionClosure: public ObjectClosure { | |
| 811 | 2924 private: |
| 342 | 2925 G1CollectedHeap* _g1h; |
| 2926 size_t _live_bytes; | |
| 2927 HeapRegion *_hr; | |
|
3772
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|
2928 VerifyOption _vo; |
| 342 | 2929 public: |
|
3772
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diff
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|
2930 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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diff
changeset
|
2931 // _vo == UseNextMarking -> use "next" marking information, |
|
6747fd0512e0
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|
2932 // _vo == UseMarkWord -> use mark word from object header. |
|
6747fd0512e0
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|
2933 VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo) |
|
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|
2934 : _live_bytes(0), _hr(hr), _vo(vo) { |
| 342 | 2935 _g1h = G1CollectedHeap::heap(); |
| 2936 } | |
| 2937 void do_object(oop o) { | |
|
3772
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|
2938 VerifyLivenessOopClosure isLive(_g1h, _vo); |
| 342 | 2939 assert(o != NULL, "Huh?"); |
|
3772
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|
2940 if (!_g1h->is_obj_dead_cond(o, _vo)) { |
|
6747fd0512e0
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changeset
|
2941 // If the object is alive according to the mark word, |
|
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changeset
|
2942 // then verify that the marking information agrees. |
|
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changeset
|
2943 // Note we can't verify the contra-positive of the |
|
6747fd0512e0
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johnc
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changeset
|
2944 // above: if the object is dead (according to the mark |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
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diff
changeset
|
2945 // word), it may not be marked, or may have been marked |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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|
2946 // 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
|
2947 // since the last marking. |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
changeset
|
2948 if (_vo == VerifyOption_G1UseMarkWord) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
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diff
changeset
|
2949 guarantee(!_g1h->is_obj_dead(o), "mark word and concurrent mark mismatch"); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
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diff
changeset
|
2950 } |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
changeset
|
2951 |
| 342 | 2952 o->oop_iterate(&isLive); |
|
1389
5dbd9300cf9c
6943926: G1: Integer overflow during heap region verification
johnc
parents:
1388
diff
changeset
|
2953 if (!_hr->obj_allocated_since_prev_marking(o)) { |
|
5dbd9300cf9c
6943926: G1: Integer overflow during heap region verification
johnc
parents:
1388
diff
changeset
|
2954 size_t obj_size = o->size(); // Make sure we don't overflow |
|
5dbd9300cf9c
6943926: G1: Integer overflow during heap region verification
johnc
parents:
1388
diff
changeset
|
2955 _live_bytes += (obj_size * HeapWordSize); |
|
5dbd9300cf9c
6943926: G1: Integer overflow during heap region verification
johnc
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1388
diff
changeset
|
2956 } |
| 342 | 2957 } |
| 2958 } | |
| 2959 size_t live_bytes() { return _live_bytes; } | |
| 2960 }; | |
| 2961 | |
| 2962 class PrintObjsInRegionClosure : public ObjectClosure { | |
| 2963 HeapRegion *_hr; | |
| 2964 G1CollectedHeap *_g1; | |
| 2965 public: | |
| 2966 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
| 2967 _g1 = G1CollectedHeap::heap(); | |
| 2968 }; | |
| 2969 | |
| 2970 void do_object(oop o) { | |
| 2971 if (o != NULL) { | |
| 2972 HeapWord *start = (HeapWord *) o; | |
| 2973 size_t word_sz = o->size(); | |
| 2974 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
| 2975 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
| 2976 (void*) o, word_sz, | |
| 2977 _g1->isMarkedPrev(o), | |
| 2978 _g1->isMarkedNext(o), | |
| 2979 _hr->obj_allocated_since_prev_marking(o)); | |
| 2980 HeapWord *end = start + word_sz; | |
| 2981 HeapWord *cur; | |
| 2982 int *val; | |
| 2983 for (cur = start; cur < end; cur++) { | |
| 2984 val = (int *) cur; | |
| 2985 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
| 2986 } | |
| 2987 } | |
| 2988 } | |
| 2989 }; | |
| 2990 | |
| 2991 class VerifyRegionClosure: public HeapRegionClosure { | |
| 811 | 2992 private: |
|
3772
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7004681: G1: Extend marking verification to Full GCs
johnc
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diff
changeset
|
2993 bool _allow_dirty; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
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3766
diff
changeset
|
2994 bool _par; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
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diff
changeset
|
2995 VerifyOption _vo; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
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3766
diff
changeset
|
2996 bool _failures; |
| 811 | 2997 public: |
|
3772
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7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2998 // _vo == UsePrevMarking -> use "prev" marking information, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2999 // _vo == UseNextMarking -> use "next" marking information, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
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3766
diff
changeset
|
3000 // _vo == UseMarkWord -> use mark word from object header. |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
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3766
diff
changeset
|
3001 VerifyRegionClosure(bool allow_dirty, bool par, VerifyOption vo) |
|
845
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6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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diff
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|
3002 : _allow_dirty(allow_dirty), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
3003 _par(par), |
|
3772
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7004681: G1: Extend marking verification to Full GCs
johnc
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diff
changeset
|
3004 _vo(vo), |
|
1020
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6882730: G1: parallel heap verification messes up region dump
tonyp
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1019
diff
changeset
|
3005 _failures(false) {} |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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parents:
1019
diff
changeset
|
3006 |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
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1019
diff
changeset
|
3007 bool failures() { |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3008 return _failures; |
|
ff2402f6a50b
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tonyp
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diff
changeset
|
3009 } |
|
845
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|
3010 |
| 342 | 3011 bool doHeapRegion(HeapRegion* r) { |
| 390 | 3012 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
| 3013 "Should be unclaimed at verify points."); | |
|
637
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3014 if (!r->continuesHumongous()) { |
|
1020
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6882730: G1: parallel heap verification messes up region dump
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1019
diff
changeset
|
3015 bool failures = false; |
|
3772
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diff
changeset
|
3016 r->verify(_allow_dirty, _vo, &failures); |
|
1020
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1019
diff
changeset
|
3017 if (failures) { |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3018 _failures = true; |
|
ff2402f6a50b
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diff
changeset
|
3019 } else { |
|
3772
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changeset
|
3020 VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo); |
|
1020
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diff
changeset
|
3021 r->object_iterate(¬_dead_yet_cl); |
|
4787
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
diff
changeset
|
3022 if (_vo != VerifyOption_G1UseNextMarking) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4785
diff
changeset
|
3023 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4785
diff
changeset
|
3024 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4785
diff
changeset
|
3025 "max_live_bytes "SIZE_FORMAT" " |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4785
diff
changeset
|
3026 "< calculated "SIZE_FORMAT, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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diff
changeset
|
3027 r->bottom(), r->end(), |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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diff
changeset
|
3028 r->max_live_bytes(), |
|
1020
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diff
changeset
|
3029 not_dead_yet_cl.live_bytes()); |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3030 _failures = true; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
diff
changeset
|
3031 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
diff
changeset
|
3032 } else { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4785
diff
changeset
|
3033 // When vo == UseNextMarking we cannot currently do a sanity |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3034 // check on the live bytes as the calculation has not been |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4785
diff
changeset
|
3035 // finalized yet. |
|
1020
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1019
diff
changeset
|
3036 } |
|
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changeset
|
3037 } |
| 342 | 3038 } |
|
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|
3039 return false; // stop the region iteration if we hit a failure |
| 342 | 3040 } |
| 3041 }; | |
| 3042 | |
| 3043 class VerifyRootsClosure: public OopsInGenClosure { | |
| 3044 private: | |
| 3045 G1CollectedHeap* _g1h; | |
|
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3046 VerifyOption _vo; |
| 342 | 3047 bool _failures; |
| 3048 public: | |
|
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3049 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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3050 // _vo == UseNextMarking -> use "next" marking information, |
|
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3051 // _vo == UseMarkWord -> use mark word from object header. |
|
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3052 VerifyRootsClosure(VerifyOption vo) : |
|
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3053 _g1h(G1CollectedHeap::heap()), |
|
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|
3054 _vo(vo), |
|
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|
3055 _failures(false) { } |
| 342 | 3056 |
| 3057 bool failures() { return _failures; } | |
| 3058 | |
|
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|
3059 template <class T> void do_oop_nv(T* p) { |
|
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3060 T heap_oop = oopDesc::load_heap_oop(p); |
|
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|
3061 if (!oopDesc::is_null(heap_oop)) { |
|
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3062 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
|
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|
3063 if (_g1h->is_obj_dead_cond(obj, _vo)) { |
| 342 | 3064 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
|
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|
3065 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
|
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|
3066 if (_vo == VerifyOption_G1UseMarkWord) { |
|
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|
3067 gclog_or_tty->print_cr(" Mark word: "PTR_FORMAT, (void*)(obj->mark())); |
|
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|
3068 } |
| 342 | 3069 obj->print_on(gclog_or_tty); |
| 3070 _failures = true; | |
| 3071 } | |
| 3072 } | |
| 3073 } | |
|
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|
3074 |
|
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|
3075 void do_oop(oop* p) { do_oop_nv(p); } |
|
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|
3076 void do_oop(narrowOop* p) { do_oop_nv(p); } |
| 342 | 3077 }; |
| 3078 | |
| 390 | 3079 // This is the task used for parallel heap verification. |
| 3080 | |
| 3081 class G1ParVerifyTask: public AbstractGangTask { | |
| 3082 private: | |
| 3083 G1CollectedHeap* _g1h; | |
|
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|
3084 bool _allow_dirty; |
|
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|
3085 VerifyOption _vo; |
|
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|
3086 bool _failures; |
| 390 | 3087 |
| 3088 public: | |
|
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|
3089 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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|
3090 // _vo == UseNextMarking -> use "next" marking information, |
|
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|
3091 // _vo == UseMarkWord -> use mark word from object header. |
|
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|
3092 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, VerifyOption vo) : |
| 390 | 3093 AbstractGangTask("Parallel verify task"), |
|
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|
3094 _g1h(g1h), |
|
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|
3095 _allow_dirty(allow_dirty), |
|
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|
3096 _vo(vo), |
|
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|
3097 _failures(false) { } |
|
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|
3098 |
|
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|
3099 bool failures() { |
|
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|
3100 return _failures; |
|
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|
3101 } |
| 390 | 3102 |
|
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|
3103 void work(uint worker_id) { |
|
637
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|
3104 HandleMark hm; |
|
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|
3105 VerifyRegionClosure blk(_allow_dirty, true, _vo); |
|
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|
3106 _g1h->heap_region_par_iterate_chunked(&blk, worker_id, |
|
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|
3107 _g1h->workers()->active_workers(), |
| 390 | 3108 HeapRegion::ParVerifyClaimValue); |
|
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|
3109 if (blk.failures()) { |
|
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|
3110 _failures = true; |
|
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|
3111 } |
| 390 | 3112 } |
| 3113 }; | |
| 3114 | |
| 342 | 3115 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
|
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|
3116 verify(allow_dirty, silent, VerifyOption_G1UsePrevMarking); |
| 811 | 3117 } |
| 3118 | |
| 3119 void G1CollectedHeap::verify(bool allow_dirty, | |
| 3120 bool silent, | |
|
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|
3121 VerifyOption vo) { |
| 342 | 3122 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
|
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|
3123 if (!silent) { gclog_or_tty->print("Roots (excluding permgen) "); } |
|
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|
3124 VerifyRootsClosure rootsCl(vo); |
|
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|
3125 |
|
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|
3126 assert(Thread::current()->is_VM_thread(), |
|
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|
3127 "Expected to be executed serially by the VM thread at this point"); |
|
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|
3128 |
|
989
148e5441d916
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|
3129 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
|
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|
3130 |
|
3293
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|
3131 // We apply the relevant closures to all the oops in the |
|
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|
3132 // system dictionary, the string table and the code cache. |
|
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|
3133 const int so = SharedHeap::SO_AllClasses | SharedHeap::SO_Strings | SharedHeap::SO_CodeCache; |
|
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|
3134 |
|
3293
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|
3135 process_strong_roots(true, // activate StrongRootsScope |
|
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|
3136 true, // we set "collecting perm gen" to true, |
|
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|
3137 // so we don't reset the dirty cards in the perm gen. |
|
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changeset
|
3138 SharedHeap::ScanningOption(so), // roots scanning options |
| 342 | 3139 &rootsCl, |
|
989
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|
3140 &blobsCl, |
| 342 | 3141 &rootsCl); |
|
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|
3142 |
|
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changeset
|
3143 // If we're verifying after the marking phase of a Full GC then we can't |
|
6747fd0512e0
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changeset
|
3144 // treat the perm gen as roots into the G1 heap. Some of the objects in |
|
6747fd0512e0
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changeset
|
3145 // the perm gen may be dead and hence not marked. If one of these dead |
|
6747fd0512e0
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changeset
|
3146 // objects is considered to be a root then we may end up with a false |
|
6747fd0512e0
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|
3147 // "Root location <x> points to dead ob <y>" failure. |
|
6747fd0512e0
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|
3148 if (vo != VerifyOption_G1UseMarkWord) { |
|
6747fd0512e0
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|
3149 // Since we used "collecting_perm_gen" == true above, we will not have |
|
6747fd0512e0
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|
3150 // checked the refs from perm into the G1-collected heap. We check those |
|
6747fd0512e0
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|
3151 // references explicitly below. Whether the relevant cards are dirty |
|
6747fd0512e0
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|
3152 // is checked further below in the rem set verification. |
|
6747fd0512e0
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diff
changeset
|
3153 if (!silent) { gclog_or_tty->print("Permgen roots "); } |
|
6747fd0512e0
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|
3154 perm_gen()->oop_iterate(&rootsCl); |
|
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|
3155 } |
|
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|
3156 bool failures = rootsCl.failures(); |
|
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|
3157 |
|
6747fd0512e0
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changeset
|
3158 if (vo != VerifyOption_G1UseMarkWord) { |
|
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|
3159 // If we're verifying during a full GC then the region sets |
|
6747fd0512e0
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|
3160 // will have been torn down at the start of the GC. Therefore |
|
6747fd0512e0
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changeset
|
3161 // verifying the region sets will fail. So we only verify |
|
6747fd0512e0
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|
3162 // the region sets when not in a full GC. |
|
6747fd0512e0
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changeset
|
3163 if (!silent) { gclog_or_tty->print("HeapRegionSets "); } |
|
6747fd0512e0
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3766
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changeset
|
3164 verify_region_sets(); |
|
6747fd0512e0
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|
3165 } |
|
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|
3166 |
| 2152 | 3167 if (!silent) { gclog_or_tty->print("HeapRegions "); } |
| 390 | 3168 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
| 3169 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 3170 "sanity check"); | |
| 3171 | |
|
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|
3172 G1ParVerifyTask task(this, allow_dirty, vo); |
|
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|
3173 assert(UseDynamicNumberOfGCThreads || |
|
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|
3174 workers()->active_workers() == workers()->total_workers(), |
|
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|
3175 "If not dynamic should be using all the workers"); |
|
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|
3176 int n_workers = workers()->active_workers(); |
| 390 | 3177 set_par_threads(n_workers); |
| 3178 workers()->run_task(&task); | |
| 3179 set_par_threads(0); | |
|
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|
3180 if (task.failures()) { |
|
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|
3181 failures = true; |
|
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|
3182 } |
| 390 | 3183 |
|
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|
3184 // Checks that the expected amount of parallel work was done. |
|
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|
3185 // The implication is that n_workers is > 0. |
| 390 | 3186 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), |
| 3187 "sanity check"); | |
| 3188 | |
| 3189 reset_heap_region_claim_values(); | |
| 3190 | |
| 3191 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 3192 "sanity check"); | |
| 3193 } else { | |
|
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|
3194 VerifyRegionClosure blk(allow_dirty, false, vo); |
| 3766 | 3195 heap_region_iterate(&blk); |
|
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|
3196 if (blk.failures()) { |
|
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|
3197 failures = true; |
|
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|
3198 } |
| 390 | 3199 } |
| 2152 | 3200 if (!silent) gclog_or_tty->print("RemSet "); |
| 342 | 3201 rem_set()->verify(); |
|
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|
3202 |
|
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|
3203 if (failures) { |
|
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3204 gclog_or_tty->print_cr("Heap:"); |
|
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|
3205 // It helps to have the per-region information in the output to |
|
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|
3206 // help us track down what went wrong. This is why we call |
|
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|
3207 // print_extended_on() instead of print_on(). |
|
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|
3208 print_extended_on(gclog_or_tty); |
|
1020
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|
3209 gclog_or_tty->print_cr(""); |
|
1547
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|
3210 #ifndef PRODUCT |
| 1044 | 3211 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
| 1388 | 3212 concurrent_mark()->print_reachable("at-verification-failure", |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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|
3213 vo, false /* all */); |
|
1020
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|
3214 } |
|
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|
3215 #endif |
|
1020
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|
3216 gclog_or_tty->flush(); |
|
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|
3217 } |
|
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|
3218 guarantee(!failures, "there should not have been any failures"); |
| 342 | 3219 } else { |
| 3220 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
| 3221 } | |
| 3222 } | |
| 3223 | |
| 3224 class PrintRegionClosure: public HeapRegionClosure { | |
| 3225 outputStream* _st; | |
| 3226 public: | |
| 3227 PrintRegionClosure(outputStream* st) : _st(st) {} | |
| 3228 bool doHeapRegion(HeapRegion* r) { | |
| 3229 r->print_on(_st); | |
| 3230 return false; | |
| 3231 } | |
| 3232 }; | |
| 3233 | |
| 3234 void G1CollectedHeap::print_on(outputStream* st) const { | |
|
838
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|
3235 st->print(" %-20s", "garbage-first heap"); |
|
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|
3236 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
|
846
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6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
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|
3237 capacity()/K, used_unlocked()/K); |
|
838
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|
3238 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
|
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|
3239 _g1_storage.low_boundary(), |
|
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|
3240 _g1_storage.high(), |
|
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|
3241 _g1_storage.high_boundary()); |
|
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|
3242 st->cr(); |
|
3986
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7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
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|
3243 st->print(" region size " SIZE_FORMAT "K, ", HeapRegion::GrainBytes / K); |
|
838
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|
3244 size_t young_regions = _young_list->length(); |
|
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|
3245 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
|
0316eac49d5a
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|
3246 young_regions, young_regions * HeapRegion::GrainBytes / K); |
|
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|
3247 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
|
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|
3248 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
|
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|
3249 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
|
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|
3250 st->cr(); |
|
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|
3251 perm()->as_gen()->print_on(st); |
|
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|
3252 } |
|
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|
3253 |
|
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|
3254 void G1CollectedHeap::print_extended_on(outputStream* st) const { |
|
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|
3255 print_on(st); |
|
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|
3256 |
|
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|
3257 // Print the per-region information. |
|
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|
3258 st->cr(); |
|
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|
3259 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 | 3260 PrintRegionClosure blk(st); |
| 3766 | 3261 heap_region_iterate(&blk); |
| 342 | 3262 } |
| 3263 | |
| 3264 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
|
1833
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|
3265 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 1019 | 3266 workers()->print_worker_threads_on(st); |
| 3267 } | |
| 3268 _cmThread->print_on(st); | |
| 342 | 3269 st->cr(); |
| 1019 | 3270 _cm->print_worker_threads_on(st); |
| 3271 _cg1r->print_worker_threads_on(st); | |
| 342 | 3272 st->cr(); |
| 3273 } | |
| 3274 | |
| 3275 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
|
1833
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|
3276 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3277 workers()->threads_do(tc); |
| 3278 } | |
| 3279 tc->do_thread(_cmThread); | |
| 794 | 3280 _cg1r->threads_do(tc); |
| 342 | 3281 } |
| 3282 | |
| 3283 void G1CollectedHeap::print_tracing_info() const { | |
| 3284 // We'll overload this to mean "trace GC pause statistics." | |
| 3285 if (TraceGen0Time || TraceGen1Time) { | |
| 3286 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
| 3287 // to that. | |
| 3288 g1_policy()->print_tracing_info(); | |
| 3289 } | |
| 751 | 3290 if (G1SummarizeRSetStats) { |
| 342 | 3291 g1_rem_set()->print_summary_info(); |
| 3292 } | |
| 1282 | 3293 if (G1SummarizeConcMark) { |
| 342 | 3294 concurrent_mark()->print_summary_info(); |
| 3295 } | |
| 3296 g1_policy()->print_yg_surv_rate_info(); | |
| 3297 SpecializationStats::print(); | |
| 3298 } | |
| 3299 | |
|
3777
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|
3300 #ifndef PRODUCT |
|
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|
3301 // Helpful for debugging RSet issues. |
|
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|
3302 |
|
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|
3303 class PrintRSetsClosure : public HeapRegionClosure { |
|
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|
3304 private: |
|
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|
3305 const char* _msg; |
|
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|
3306 size_t _occupied_sum; |
|
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|
3307 |
|
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|
3308 public: |
|
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|
3309 bool doHeapRegion(HeapRegion* r) { |
|
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|
3310 HeapRegionRemSet* hrrs = r->rem_set(); |
|
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|
3311 size_t occupied = hrrs->occupied(); |
|
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|
3312 _occupied_sum += occupied; |
|
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|
3313 |
|
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|
3314 gclog_or_tty->print_cr("Printing RSet for region "HR_FORMAT, |
|
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|
3315 HR_FORMAT_PARAMS(r)); |
|
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|
3316 if (occupied == 0) { |
|
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|
3317 gclog_or_tty->print_cr(" RSet is empty"); |
|
e8b0b0392037
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|
3318 } else { |
|
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|
3319 hrrs->print(); |
|
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|
3320 } |
|
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|
3321 gclog_or_tty->print_cr("----------"); |
|
e8b0b0392037
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|
3322 return false; |
|
e8b0b0392037
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|
3323 } |
|
e8b0b0392037
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|
3324 |
|
e8b0b0392037
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|
3325 PrintRSetsClosure(const char* msg) : _msg(msg), _occupied_sum(0) { |
|
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|
3326 gclog_or_tty->cr(); |
|
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|
3327 gclog_or_tty->print_cr("========================================"); |
|
e8b0b0392037
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|
3328 gclog_or_tty->print_cr(msg); |
|
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|
3329 gclog_or_tty->cr(); |
|
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|
3330 } |
|
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|
3331 |
|
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|
3332 ~PrintRSetsClosure() { |
|
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|
3333 gclog_or_tty->print_cr("Occupied Sum: "SIZE_FORMAT, _occupied_sum); |
|
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|
3334 gclog_or_tty->print_cr("========================================"); |
|
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changeset
|
3335 gclog_or_tty->cr(); |
|
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|
3336 } |
|
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|
3337 }; |
|
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|
3338 |
|
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|
3339 void G1CollectedHeap::print_cset_rsets() { |
|
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|
3340 PrintRSetsClosure cl("Printing CSet RSets"); |
|
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|
3341 collection_set_iterate(&cl); |
|
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|
3342 } |
|
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|
3343 |
|
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|
3344 void G1CollectedHeap::print_all_rsets() { |
|
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|
3345 PrintRSetsClosure cl("Printing All RSets");; |
|
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|
3346 heap_region_iterate(&cl); |
|
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|
3347 } |
|
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|
3348 #endif // PRODUCT |
|
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|
3349 |
| 342 | 3350 G1CollectedHeap* G1CollectedHeap::heap() { |
| 3351 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
| 3352 "not a garbage-first heap"); | |
| 3353 return _g1h; | |
| 3354 } | |
| 3355 | |
| 3356 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
|
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|
3357 // always_do_update_barrier = false; |
| 342 | 3358 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
| 3359 // Call allocation profiler | |
| 3360 AllocationProfiler::iterate_since_last_gc(); | |
| 3361 // Fill TLAB's and such | |
| 3362 ensure_parsability(true); | |
| 3363 } | |
| 3364 | |
| 3365 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
| 3366 // FIXME: what is this about? | |
| 3367 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
| 3368 // is set. | |
| 3369 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
| 3370 "derived pointer present")); | |
|
1245
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|
3371 // always_do_update_barrier = true; |
|
3979
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6484982: G1: process references during evacuation pauses
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|
3372 |
|
4dfb2df418f2
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|
3373 // We have just completed a GC. Update the soft reference |
|
4dfb2df418f2
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|
3374 // policy with the new heap occupancy |
|
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|
3375 Universe::update_heap_info_at_gc(); |
| 342 | 3376 } |
| 3377 | |
| 1973 | 3378 HeapWord* G1CollectedHeap::do_collection_pause(size_t word_size, |
| 3379 unsigned int gc_count_before, | |
| 3380 bool* succeeded) { | |
| 3381 assert_heap_not_locked_and_not_at_safepoint(); | |
| 342 | 3382 g1_policy()->record_stop_world_start(); |
| 1973 | 3383 VM_G1IncCollectionPause op(gc_count_before, |
| 3384 word_size, | |
| 3385 false, /* should_initiate_conc_mark */ | |
| 3386 g1_policy()->max_pause_time_ms(), | |
| 3387 GCCause::_g1_inc_collection_pause); | |
| 3388 VMThread::execute(&op); | |
| 3389 | |
| 3390 HeapWord* result = op.result(); | |
| 3391 bool ret_succeeded = op.prologue_succeeded() && op.pause_succeeded(); | |
| 3392 assert(result == NULL || ret_succeeded, | |
| 3393 "the result should be NULL if the VM did not succeed"); | |
| 3394 *succeeded = ret_succeeded; | |
| 3395 | |
| 3396 assert_heap_not_locked(); | |
| 3397 return result; | |
| 342 | 3398 } |
| 3399 | |
| 3400 void | |
| 3401 G1CollectedHeap::doConcurrentMark() { | |
|
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3402 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
|
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|
3403 if (!_cmThread->in_progress()) { |
|
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|
3404 _cmThread->set_started(); |
|
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|
3405 CGC_lock->notify(); |
| 342 | 3406 } |
| 3407 } | |
| 3408 | |
| 3409 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
| 3410 bool young) { | |
| 3411 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
| 3412 } | |
| 3413 | |
| 3414 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
| 3415 predicted_time_ms) { | |
| 3416 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
| 3417 } | |
| 3418 | |
| 3419 size_t G1CollectedHeap::pending_card_num() { | |
| 3420 size_t extra_cards = 0; | |
| 3421 JavaThread *curr = Threads::first(); | |
| 3422 while (curr != NULL) { | |
| 3423 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
| 3424 extra_cards += dcq.size(); | |
| 3425 curr = curr->next(); | |
| 3426 } | |
| 3427 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 3428 size_t buffer_size = dcqs.buffer_size(); | |
| 3429 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 3430 return buffer_size * buffer_num + extra_cards; | |
| 3431 } | |
| 3432 | |
| 3433 size_t G1CollectedHeap::max_pending_card_num() { | |
| 3434 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 3435 size_t buffer_size = dcqs.buffer_size(); | |
| 3436 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 3437 int thread_num = Threads::number_of_threads(); | |
| 3438 return (buffer_num + thread_num) * buffer_size; | |
| 3439 } | |
| 3440 | |
| 3441 size_t G1CollectedHeap::cards_scanned() { | |
| 1861 | 3442 return g1_rem_set()->cardsScanned(); |
| 342 | 3443 } |
| 3444 | |
| 3445 void | |
| 3446 G1CollectedHeap::setup_surviving_young_words() { | |
| 3447 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
|
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|
3448 size_t array_length = g1_policy()->young_cset_region_length(); |
| 342 | 3449 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); |
| 3450 if (_surviving_young_words == NULL) { | |
| 3451 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
| 3452 "Not enough space for young surv words summary."); | |
| 3453 } | |
| 3454 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
|
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|
3455 #ifdef ASSERT |
| 342 | 3456 for (size_t i = 0; i < array_length; ++i) { |
|
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|
3457 assert( _surviving_young_words[i] == 0, "memset above" ); |
|
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|
3458 } |
|
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|
3459 #endif // !ASSERT |
| 342 | 3460 } |
| 3461 | |
| 3462 void | |
| 3463 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
| 3464 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
|
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|
3465 size_t array_length = g1_policy()->young_cset_region_length(); |
| 342 | 3466 for (size_t i = 0; i < array_length; ++i) |
| 3467 _surviving_young_words[i] += surv_young_words[i]; | |
| 3468 } | |
| 3469 | |
| 3470 void | |
| 3471 G1CollectedHeap::cleanup_surviving_young_words() { | |
| 3472 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
| 3473 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
| 3474 _surviving_young_words = NULL; | |
| 3475 } | |
| 3476 | |
|
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|
3477 #ifdef ASSERT |
|
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|
3478 class VerifyCSetClosure: public HeapRegionClosure { |
|
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|
3479 public: |
|
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changeset
|
3480 bool doHeapRegion(HeapRegion* hr) { |
|
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changeset
|
3481 // Here we check that the CSet region's RSet is ready for parallel |
|
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changeset
|
3482 // iteration. The fields that we'll verify are only manipulated |
|
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|
3483 // when the region is part of a CSet and is collected. Afterwards, |
|
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|
3484 // we reset these fields when we clear the region's RSet (when the |
|
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changeset
|
3485 // region is freed) so they are ready when the region is |
|
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|
3486 // re-allocated. The only exception to this is if there's an |
|
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changeset
|
3487 // evacuation failure and instead of freeing the region we leave |
|
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changeset
|
3488 // it in the heap. In that case, we reset these fields during |
|
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changeset
|
3489 // evacuation failure handling. |
|
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changeset
|
3490 guarantee(hr->rem_set()->verify_ready_for_par_iteration(), "verification"); |
|
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|
3491 |
|
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changeset
|
3492 // Here's a good place to add any other checks we'd like to |
|
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changeset
|
3493 // perform on CSet regions. |
|
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
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diff
changeset
|
3494 return false; |
|
0414c1049f15
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iveresov
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1245
diff
changeset
|
3495 } |
|
0414c1049f15
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diff
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|
3496 }; |
|
3777
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changeset
|
3497 #endif // ASSERT |
|
1261
0414c1049f15
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|
3498 |
| 1709 | 3499 #if TASKQUEUE_STATS |
| 3500 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
| 3501 st->print_raw_cr("GC Task Stats"); | |
| 3502 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
| 3503 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
| 3504 } | |
| 3505 | |
| 3506 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
| 3507 print_taskqueue_stats_hdr(st); | |
| 3508 | |
| 3509 TaskQueueStats totals; | |
|
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
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1719
diff
changeset
|
3510 const int n = workers() != NULL ? workers()->total_workers() : 1; |
| 1709 | 3511 for (int i = 0; i < n; ++i) { |
| 3512 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
| 3513 totals += task_queue(i)->stats; | |
| 3514 } | |
| 3515 st->print_raw("tot "); totals.print(st); st->cr(); | |
| 3516 | |
| 3517 DEBUG_ONLY(totals.verify()); | |
| 3518 } | |
| 3519 | |
| 3520 void G1CollectedHeap::reset_taskqueue_stats() { | |
|
1755
8e5955ddf8e4
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1719
diff
changeset
|
3521 const int n = workers() != NULL ? workers()->total_workers() : 1; |
| 1709 | 3522 for (int i = 0; i < n; ++i) { |
| 3523 task_queue(i)->stats.reset(); | |
| 3524 } | |
| 3525 } | |
| 3526 #endif // TASKQUEUE_STATS | |
| 3527 | |
| 1973 | 3528 bool |
|
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changeset
|
3529 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
| 2152 | 3530 assert_at_safepoint(true /* should_be_vm_thread */); |
| 3531 guarantee(!is_gc_active(), "collection is not reentrant"); | |
| 3532 | |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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changeset
|
3533 if (GC_locker::check_active_before_gc()) { |
| 1973 | 3534 return false; |
|
1359
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
3535 } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3536 |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2039
diff
changeset
|
3537 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
|
2039
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
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parents:
2038
diff
changeset
|
3538 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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|
3539 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3540 if (PrintHeapAtGC) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3541 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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|
3542 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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changeset
|
3543 |
| 4072 | 3544 HRSPhaseSetter x(HRSPhaseEvacuation); |
| 2152 | 3545 verify_region_sets_optional(); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
changeset
|
3546 verify_dirty_young_regions(); |
| 2152 | 3547 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3548 { |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3549 // This call will decide whether this pause is an initial-mark |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3550 // 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
|
3551 // for the duration of this pause. |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3552 g1_policy()->decide_on_conc_mark_initiation(); |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3553 |
| 4710 | 3554 // We do not allow initial-mark to be piggy-backed on a mixed GC. |
|
3982
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
johnc
parents:
3980
diff
changeset
|
3555 assert(!g1_policy()->during_initial_mark_pause() || |
| 4710 | 3556 g1_policy()->gcs_are_young(), "sanity"); |
| 3557 | |
| 3558 // We also do not allow mixed GCs during marking. | |
| 3559 assert(!mark_in_progress() || g1_policy()->gcs_are_young(), "sanity"); | |
|
3982
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
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parents:
3980
diff
changeset
|
3560 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3561 char verbose_str[128]; |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
changeset
|
3562 sprintf(verbose_str, "GC pause "); |
| 4710 | 3563 if (g1_policy()->gcs_are_young()) { |
|
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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3830
diff
changeset
|
3564 strcat(verbose_str, "(young)"); |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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3830
diff
changeset
|
3565 } else { |
| 4710 | 3566 strcat(verbose_str, "(mixed)"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
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|
3567 } |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
changeset
|
3568 if (g1_policy()->during_initial_mark_pause()) { |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
changeset
|
3569 strcat(verbose_str, " (initial-mark)"); |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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parents:
1611
diff
changeset
|
3570 // We are about to start a marking cycle, so we increment the |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
changeset
|
3571 // full collection counter. |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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parents:
1611
diff
changeset
|
3572 increment_total_full_collections(); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
changeset
|
3573 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3574 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3575 // if PrintGCDetails is on, we'll print long statistics information |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3576 // 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
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diff
changeset
|
3577 // is messy if we do. |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
changeset
|
3578 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
811
diff
changeset
|
3579 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
changeset
|
3580 TraceTime t(verbose_str, PrintGC && !PrintGCDetails, true, gclog_or_tty); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
changeset
|
3581 |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3582 TraceCollectorStats tcs(g1mm()->incremental_collection_counters()); |
|
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
3583 TraceMemoryManagerStats tms(false /* fullGC */, gc_cause()); |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3584 |
| 2361 | 3585 // If the secondary_free_list is not empty, append it to the |
| 3586 // free_list. No need to wait for the cleanup operation to finish; | |
| 3587 // the region allocation code will check the secondary_free_list | |
| 3588 // and wait if necessary. If the G1StressConcRegionFreeing flag is | |
| 3589 // set, skip this step so that the region allocation code has to | |
| 3590 // get entries from the secondary_free_list. | |
| 2152 | 3591 if (!G1StressConcRegionFreeing) { |
| 2361 | 3592 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 3593 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
changeset
|
3594 |
|
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3595 assert(check_young_list_well_formed(), |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3596 "young list should be well formed"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
changeset
|
3597 |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3598 // 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
|
3599 // 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
|
3600 // it will be set. |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3601 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3602 { // 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
|
3603 IsGCActiveMark x; |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3604 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3605 gc_prologue(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3606 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
|
3607 increment_gc_time_stamp(); |
| 342 | 3608 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3609 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3610 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
|
3611 gclog_or_tty->print(" VerifyBeforeGC:"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3612 prepare_for_verify(); |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3613 Universe::verify(/* allow dirty */ false, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3614 /* silent */ false, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3615 /* option */ VerifyOption_G1UsePrevMarking); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3616 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3617 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3618 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3619 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3620 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3621 // Please see comment in g1CollectedHeap.hpp and |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3622 // G1CollectedHeap::ref_processing_init() to see how |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3623 // reference processing currently works in G1. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3624 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3625 // Enable discovery in the STW reference processor |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3626 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3627 true /*verify_no_refs*/); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3628 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3629 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3630 // We want to temporarily turn off discovery by the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3631 // CM ref processor, if necessary, and turn it back on |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3632 // on again later if we do. Using a scoped |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3633 // NoRefDiscovery object will do this. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3634 NoRefDiscovery no_cm_discovery(ref_processor_cm()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3635 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3636 // 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
|
3637 // of the collection set!). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3638 release_mutator_alloc_region(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3639 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3640 // We should call this after we retire the mutator alloc |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3641 // region(s) so that all the ALLOC / RETIRE events are generated |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3642 // before the start GC event. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3643 _hr_printer.start_gc(false /* full */, (size_t) total_collections()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3644 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3645 // The elapsed time induced by the start time below deliberately elides |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3646 // the possible verification above. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3647 double start_time_sec = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3648 size_t start_used_bytes = used(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3649 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3650 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3651 gclog_or_tty->print_cr("\nBefore recording pause start.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3652 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3653 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
|
3654 #endif // YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3655 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3656 g1_policy()->record_collection_pause_start(start_time_sec, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3657 start_used_bytes); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3658 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3659 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3660 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3661 _young_list->print(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3662 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3663 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3664 if (g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3665 concurrent_mark()->checkpointRootsInitialPre(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3666 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3667 perm_gen()->save_marks(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3668 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3669 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3670 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3671 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3672 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
|
3673 #endif // YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3674 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3675 g1_policy()->choose_collection_set(target_pause_time_ms); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3676 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3677 _cm->note_start_of_gc(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3678 // We should not verify the per-thread SATB buffers given that |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3679 // we have not filtered them yet (we'll do so during the |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3680 // GC). We also call this after choose_collection_set() to |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3681 // ensure that the CSet has been finalized. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3682 _cm->verify_no_cset_oops(true /* verify_stacks */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3683 true /* verify_enqueued_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3684 false /* verify_thread_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3685 true /* verify_fingers */); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3686 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3687 if (_hr_printer.is_active()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3688 HeapRegion* hr = g1_policy()->collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3689 while (hr != NULL) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3690 G1HRPrinter::RegionType type; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3691 if (!hr->is_young()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3692 type = G1HRPrinter::Old; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3693 } else if (hr->is_survivor()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3694 type = G1HRPrinter::Survivor; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3695 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3696 type = G1HRPrinter::Eden; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3697 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3698 _hr_printer.cset(hr); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3699 hr = hr->next_in_collection_set(); |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3700 } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3701 } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3702 |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3703 #ifdef ASSERT |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3704 VerifyCSetClosure cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3705 collection_set_iterate(&cl); |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3706 #endif // ASSERT |
| 1707 | 3707 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3708 setup_surviving_young_words(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3709 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3710 // Initialize the GC alloc regions. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3711 init_gc_alloc_regions(); |
|
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 // Actually do the work... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3714 evacuate_collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3715 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3716 // We do this to mainly verify the per-thread SATB buffers |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3717 // (which have been filtered by now) since we didn't verify |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3718 // them earlier. No point in re-checking the stacks / enqueued |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3719 // buffers given that the CSet has not changed since last time |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3720 // we checked. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3721 _cm->verify_no_cset_oops(false /* verify_stacks */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3722 false /* verify_enqueued_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3723 true /* verify_thread_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3724 true /* verify_fingers */); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3725 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3726 free_collection_set(g1_policy()->collection_set()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3727 g1_policy()->clear_collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3728 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3729 cleanup_surviving_young_words(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3730 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3731 // Start a new incremental collection set for the next pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3732 g1_policy()->start_incremental_cset_building(); |
|
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 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3735 // regions to the incremental collection set for the next |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3736 // evacuation pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3737 clear_cset_fast_test(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3738 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3739 _young_list->reset_sampled_info(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3740 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3741 // Don't check the whole heap at this point as the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3742 // GC alloc regions from this pause have been tagged |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3743 // as survivors and moved on to the survivor list. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3744 // Survivor regions will fail the !is_young() check. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3745 assert(check_young_list_empty(false /* check_heap */), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3746 "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
|
3747 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3748 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3749 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3750 _young_list->print(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3751 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3752 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3753 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3754 _young_list->first_survivor_region(), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3755 _young_list->last_survivor_region()); |
|
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 _young_list->reset_auxilary_lists(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3758 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3759 if (evacuation_failed()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3760 _summary_bytes_used = recalculate_used(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3761 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3762 // The "used" of the the collection set have already been subtracted |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3763 // when they were freed. Add in the bytes evacuated. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3764 _summary_bytes_used += g1_policy()->bytes_copied_during_gc(); |
|
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 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3767 if (g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3768 concurrent_mark()->checkpointRootsInitialPost(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3769 set_marking_started(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3770 // CAUTION: after the doConcurrentMark() call below, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3771 // the concurrent marking thread(s) could be running |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3772 // concurrently with us. Make sure that anything after |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3773 // 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
|
3774 // running. Note: of course, the actual marking work will |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3775 // not start until the safepoint itself is released in |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3776 // ConcurrentGCThread::safepoint_desynchronize(). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3777 doConcurrentMark(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3778 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3779 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3780 allocate_dummy_regions(); |
|
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
3781 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3782 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3783 gclog_or_tty->print_cr("\nEnd of the pause.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3784 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3785 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
|
3786 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3787 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3788 init_mutator_alloc_region(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3789 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3790 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3791 size_t expand_bytes = g1_policy()->expansion_amount(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3792 if (expand_bytes > 0) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3793 size_t bytes_before = capacity(); |
| 4785 | 3794 // No need for an ergo verbose message here, |
| 3795 // expansion_amount() does this when it returns a value > 0. | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3796 if (!expand(expand_bytes)) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3797 // We failed to expand the heap so let's verify that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3798 // committed/uncommitted amount match the backing store |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3799 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3800 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3801 } |
|
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3802 } |
|
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3803 } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3804 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3805 // We redo the verificaiton but now wrt to the new CSet which |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3806 // has just got initialized after the previous CSet was freed. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3807 _cm->verify_no_cset_oops(true /* verify_stacks */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3808 true /* verify_enqueued_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3809 true /* verify_thread_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3810 true /* verify_fingers */); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3811 _cm->note_end_of_gc(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3812 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3813 double end_time_sec = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3814 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3815 g1_policy()->record_pause_time_ms(pause_time_ms); |
| 4711 | 3816 int active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
| 3817 workers()->active_workers() : 1); | |
| 3818 g1_policy()->record_collection_pause_end(active_workers); | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3819 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3820 MemoryService::track_memory_usage(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3821 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3822 // 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
|
3823 // update buffers to bring the RSets up-to-date if |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3824 // G1HRRSFlushLogBuffersOnVerify has been set. While scanning |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3825 // 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
|
3826 // regions we just allocated to (i.e., the GC alloc |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3827 // regions). However, during the last GC we called |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3828 // set_saved_mark() on all the GC alloc regions, so card |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3829 // scanning might skip the [saved_mark_word()...top()] area of |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3830 // those regions (i.e., the area we allocated objects into |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3831 // during the last GC). But it shouldn't. Given that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3832 // saved_mark_word() is conditional on whether the GC time stamp |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3833 // 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
|
3834 // 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
|
3835 // regions and saved_mark_word() will simply return top() for |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3836 // 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
|
3837 // than iterating over the regions and fixing them. In fact, the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3838 // GC time stamp increment here also ensures that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3839 // saved_mark_word() will return top() between pauses, i.e., |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3840 // during concurrent refinement. So we don't need the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3841 // is_gc_active() check to decided which top to use when |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3842 // scanning cards (see CR 7039627). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3843 increment_gc_time_stamp(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3844 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3845 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3846 HandleMark hm; // Discard invalid handles created during verification |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3847 gclog_or_tty->print(" VerifyAfterGC:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3848 prepare_for_verify(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3849 Universe::verify(/* allow dirty */ true, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3850 /* silent */ false, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3851 /* option */ VerifyOption_G1UsePrevMarking); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3852 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3853 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3854 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3855 ref_processor_stw()->verify_no_references_recorded(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3856 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3857 // 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
|
3858 } |
|
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3859 |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3860 // 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
|
3861 // 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
|
3862 // 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
|
3863 // RETIRE events are generated before the end GC event. |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3864 _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
|
3865 |
|
3764
053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
tonyp
parents:
3378
diff
changeset
|
3866 // 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
|
3867 g1_policy()->print_heap_transition(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3868 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3869 if (mark_in_progress()) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3870 concurrent_mark()->update_g1_committed(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3871 } |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3872 |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3873 #ifdef TRACESPINNING |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3874 ParallelTaskTerminator::print_termination_counts(); |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3875 #endif |
| 342 | 3876 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3877 gc_epilogue(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3878 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3879 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3880 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3881 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
|
3882 print_tracing_info(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3883 vm_exit(-1); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3884 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3885 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3886 |
| 3766 | 3887 _hrs.verify_optional(); |
| 2152 | 3888 verify_region_sets_optional(); |
| 3889 | |
| 1709 | 3890 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
| 3891 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); | |
| 3892 | |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3893 if (PrintHeapAtGC) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3894 Universe::print_heap_after_gc(); |
| 342 | 3895 } |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
3896 g1mm()->update_sizes(); |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3897 |
|
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3898 if (G1SummarizeRSetStats && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3899 (G1SummarizeRSetStatsPeriod > 0) && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3900 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3901 g1_rem_set()->print_summary_info(); |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3902 } |
| 1973 | 3903 |
| 3904 return true; | |
| 342 | 3905 } |
| 3906 | |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3907 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3908 { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3909 size_t gclab_word_size; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3910 switch (purpose) { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3911 case GCAllocForSurvived: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3912 gclab_word_size = YoungPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3913 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3914 case GCAllocForTenured: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3915 gclab_word_size = OldPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3916 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3917 default: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3918 assert(false, "unknown GCAllocPurpose"); |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3919 gclab_word_size = OldPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3920 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3921 } |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3922 return gclab_word_size; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3923 } |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3924 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3925 void G1CollectedHeap::init_mutator_alloc_region() { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3926 assert(_mutator_alloc_region.get() == NULL, "pre-condition"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3927 _mutator_alloc_region.init(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3928 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3929 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3930 void G1CollectedHeap::release_mutator_alloc_region() { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3931 _mutator_alloc_region.release(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3932 assert(_mutator_alloc_region.get() == NULL, "post-condition"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3933 } |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3934 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3935 void G1CollectedHeap::init_gc_alloc_regions() { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3936 assert_at_safepoint(true /* should_be_vm_thread */); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3937 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3938 _survivor_gc_alloc_region.init(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3939 _old_gc_alloc_region.init(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3940 HeapRegion* retained_region = _retained_old_gc_alloc_region; |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3941 _retained_old_gc_alloc_region = NULL; |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3942 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3943 // We will discard the current GC alloc region if: |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3944 // a) it's in the collection set (it can happen!), |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3945 // b) it's already full (no point in using it), |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3946 // 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
tonyp
parents:
3824
diff
changeset
|
3947 // 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
tonyp
parents:
3824
diff
changeset
|
3948 // d) it's humongous (this means that it was emptied |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3949 // 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
tonyp
parents:
3824
diff
changeset
|
3950 // has been subseqently used to allocate a humongous |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3951 // object that may be less than the region size). |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3952 if (retained_region != NULL && |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3953 !retained_region->in_collection_set() && |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3954 !(retained_region->top() == retained_region->end()) && |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3955 !retained_region->is_empty() && |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3956 !retained_region->isHumongous()) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3957 retained_region->set_saved_mark(); |
| 4072 | 3958 // The retained region was added to the old region set when it was |
| 3959 // retired. We have to remove it now, since we don't allow regions | |
| 3960 // we allocate to in the region sets. We'll re-add it later, when | |
| 3961 // it's retired again. | |
| 3962 _old_set.remove(retained_region); | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3963 bool during_im = g1_policy()->during_initial_mark_pause(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3964 retained_region->note_start_of_copying(during_im); |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3965 _old_gc_alloc_region.set(retained_region); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3966 _hr_printer.reuse(retained_region); |
| 342 | 3967 } |
| 3968 } | |
| 3969 | |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3970 void G1CollectedHeap::release_gc_alloc_regions() { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3971 _survivor_gc_alloc_region.release(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3972 // If we have an old GC alloc region to release, we'll save it in |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3973 // _retained_old_gc_alloc_region. If we don't |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3974 // _retained_old_gc_alloc_region will become NULL. This is what we |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3975 // want either way so no reason to check explicitly for either |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3976 // condition. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3977 _retained_old_gc_alloc_region = _old_gc_alloc_region.release(); |
| 342 | 3978 } |
| 3979 | |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3980 void G1CollectedHeap::abandon_gc_alloc_regions() { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
3981 assert(_survivor_gc_alloc_region.get() == NULL, "pre-condition"); |
|
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|
3982 assert(_old_gc_alloc_region.get() == NULL, "pre-condition"); |
|
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|
3983 _retained_old_gc_alloc_region = NULL; |
| 342 | 3984 } |
| 3985 | |
| 3986 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
| 3987 _drain_in_progress = false; | |
| 3988 set_evac_failure_closure(cl); | |
| 3989 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 3990 } | |
| 3991 | |
| 3992 void G1CollectedHeap::finalize_for_evac_failure() { | |
| 3993 assert(_evac_failure_scan_stack != NULL && | |
| 3994 _evac_failure_scan_stack->length() == 0, | |
| 3995 "Postcondition"); | |
| 3996 assert(!_drain_in_progress, "Postcondition"); | |
| 1045 | 3997 delete _evac_failure_scan_stack; |
| 342 | 3998 _evac_failure_scan_stack = NULL; |
| 3999 } | |
| 4000 | |
| 4001 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
|
4783
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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4781
diff
changeset
|
4002 assert(check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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|
4003 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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|
4004 |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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|
4005 G1ParRemoveSelfForwardPtrsTask rsfp_task(this); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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|
4006 |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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|
4007 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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|
4008 set_par_threads(); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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|
4009 workers()->run_task(&rsfp_task); |
|
023652e49ac0
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|
4010 set_par_threads(0); |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
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diff
changeset
|
4011 } else { |
|
4783
023652e49ac0
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|
4012 rsfp_task.work(0); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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|
4013 } |
|
023652e49ac0
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|
4014 |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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changeset
|
4015 assert(check_cset_heap_region_claim_values(HeapRegion::ParEvacFailureClaimValue), "sanity"); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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|
4016 |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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|
4017 // Reset the claim values in the regions in the collection set. |
|
023652e49ac0
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|
4018 reset_cset_heap_region_claim_values(); |
|
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|
4019 |
|
023652e49ac0
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|
4020 assert(check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
| 342 | 4021 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); |
| 4022 | |
| 4023 // Now restore saved marks, if any. | |
| 4024 if (_objs_with_preserved_marks != NULL) { | |
| 4025 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
| 4026 guarantee(_objs_with_preserved_marks->length() == | |
| 4027 _preserved_marks_of_objs->length(), "Both or none."); | |
| 4028 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
| 4029 oop obj = _objs_with_preserved_marks->at(i); | |
| 4030 markOop m = _preserved_marks_of_objs->at(i); | |
| 4031 obj->set_mark(m); | |
| 4032 } | |
|
4783
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|
4033 |
| 342 | 4034 // Delete the preserved marks growable arrays (allocated on the C heap). |
| 4035 delete _objs_with_preserved_marks; | |
| 4036 delete _preserved_marks_of_objs; | |
| 4037 _objs_with_preserved_marks = NULL; | |
| 4038 _preserved_marks_of_objs = NULL; | |
| 4039 } | |
| 4040 } | |
| 4041 | |
| 4042 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
| 4043 _evac_failure_scan_stack->push(obj); | |
| 4044 } | |
| 4045 | |
| 4046 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
| 4047 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
| 4048 | |
| 4049 while (_evac_failure_scan_stack->length() > 0) { | |
| 4050 oop obj = _evac_failure_scan_stack->pop(); | |
| 4051 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
| 4052 obj->oop_iterate_backwards(_evac_failure_closure); | |
| 4053 } | |
| 4054 } | |
| 4055 | |
| 4056 oop | |
| 4057 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
diff
changeset
|
4058 oop old) { |
|
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4059 assert(obj_in_cs(old), |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4060 err_msg("obj: "PTR_FORMAT" should still be in the CSet", |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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parents:
3317
diff
changeset
|
4061 (HeapWord*) old)); |
| 342 | 4062 markOop m = old->mark(); |
| 4063 oop forward_ptr = old->forward_to_atomic(old); | |
| 4064 if (forward_ptr == NULL) { | |
| 4065 // Forward-to-self succeeded. | |
|
3973
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4066 |
| 342 | 4067 if (_evac_failure_closure != cl) { |
| 4068 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
| 4069 assert(!_drain_in_progress, | |
| 4070 "Should only be true while someone holds the lock."); | |
| 4071 // Set the global evac-failure closure to the current thread's. | |
| 4072 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
| 4073 set_evac_failure_closure(cl); | |
| 4074 // Now do the common part. | |
| 4075 handle_evacuation_failure_common(old, m); | |
| 4076 // Reset to NULL. | |
| 4077 set_evac_failure_closure(NULL); | |
| 4078 } else { | |
| 4079 // The lock is already held, and this is recursive. | |
| 4080 assert(_drain_in_progress, "This should only be the recursive case."); | |
| 4081 handle_evacuation_failure_common(old, m); | |
| 4082 } | |
| 4083 return old; | |
| 4084 } else { | |
|
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4085 // Forward-to-self failed. Either someone else managed to allocate |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4086 // space for this object (old != forward_ptr) or they beat us in |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4087 // self-forwarding it (old == forward_ptr). |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4088 assert(old == forward_ptr || !obj_in_cs(forward_ptr), |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4089 err_msg("obj: "PTR_FORMAT" forwarded to: "PTR_FORMAT" " |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4090 "should not be in the CSet", |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4091 (HeapWord*) old, (HeapWord*) forward_ptr)); |
| 342 | 4092 return forward_ptr; |
| 4093 } | |
| 4094 } | |
| 4095 | |
| 4096 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
| 4097 set_evacuation_failed(true); | |
| 4098 | |
| 4099 preserve_mark_if_necessary(old, m); | |
| 4100 | |
| 4101 HeapRegion* r = heap_region_containing(old); | |
| 4102 if (!r->evacuation_failed()) { | |
| 4103 r->set_evacuation_failed(true); | |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
4104 _hr_printer.evac_failure(r); |
| 342 | 4105 } |
| 4106 | |
| 4107 push_on_evac_failure_scan_stack(old); | |
| 4108 | |
| 4109 if (!_drain_in_progress) { | |
| 4110 // prevent recursion in copy_to_survivor_space() | |
| 4111 _drain_in_progress = true; | |
| 4112 drain_evac_failure_scan_stack(); | |
| 4113 _drain_in_progress = false; | |
| 4114 } | |
| 4115 } | |
| 4116 | |
| 4117 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
|
2038
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4118 assert(evacuation_failed(), "Oversaving!"); |
|
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4119 // We want to call the "for_promotion_failure" version only in the |
|
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4120 // case of a promotion failure. |
|
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4121 if (m->must_be_preserved_for_promotion_failure(obj)) { |
| 342 | 4122 if (_objs_with_preserved_marks == NULL) { |
| 4123 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
| 4124 _objs_with_preserved_marks = | |
| 4125 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 4126 _preserved_marks_of_objs = | |
| 4127 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
| 4128 } | |
| 4129 _objs_with_preserved_marks->push(obj); | |
| 4130 _preserved_marks_of_objs->push(m); | |
| 4131 } | |
| 4132 } | |
| 4133 | |
| 4134 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
| 4135 size_t word_size) { | |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4136 if (purpose == GCAllocForSurvived) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4137 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
|
4138 if (result != NULL) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4139 return result; |
| 342 | 4140 } else { |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4141 // 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
|
4142 // object there. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4143 return old_attempt_allocation(word_size); |
| 342 | 4144 } |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4145 } else { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4146 assert(purpose == GCAllocForTenured, "sanity"); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4147 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
|
4148 if (result != NULL) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4149 return result; |
| 342 | 4150 } else { |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4151 // 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
|
4152 // object there. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
changeset
|
4153 return survivor_attempt_allocation(word_size); |
| 342 | 4154 } |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4155 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4156 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4157 ShouldNotReachHere(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4158 // Trying to keep some compilers happy. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
changeset
|
4159 return NULL; |
| 342 | 4160 } |
| 4161 | |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4162 G1ParGCAllocBuffer::G1ParGCAllocBuffer(size_t gclab_word_size) : |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4163 ParGCAllocBuffer(gclab_word_size), _retired(false) { } |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4164 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4165 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
4166 : _g1h(g1h), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
4167 _refs(g1h->task_queue(queue_num)), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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diff
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|
4168 _dcq(&g1h->dirty_card_queue_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4169 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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838
diff
changeset
|
4170 _g1_rem(g1h->g1_rem_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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838
diff
changeset
|
4171 _hash_seed(17), _queue_num(queue_num), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4172 _term_attempts(0), |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4173 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4174 _tenured_alloc_buffer(g1h->desired_plab_sz(GCAllocForTenured)), |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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838
diff
changeset
|
4175 _age_table(false), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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838
diff
changeset
|
4176 _strong_roots_time(0), _term_time(0), |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4785
diff
changeset
|
4177 _alloc_buffer_waste(0), _undo_waste(0) { |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4178 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4179 // 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
|
4180 // non-young regions (where the age is -1) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4181 // 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
|
4182 // 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
|
4183 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
|
4184 size_t array_length = PADDING_ELEM_NUM + |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4185 real_length + |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4186 PADDING_ELEM_NUM; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4187 _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
|
4188 if (_surviving_young_words_base == NULL) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4189 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
|
4190 "Not enough space for young surv histo."); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4191 _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
|
4192 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
|
4193 |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4194 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4195 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4196 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4197 _start = os::elapsedTime(); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
4198 } |
| 342 | 4199 |
| 1709 | 4200 void |
| 4201 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
| 4202 { | |
| 4203 st->print_raw_cr("GC Termination Stats"); | |
| 4204 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
| 4205 " ------waste (KiB)------"); | |
| 4206 st->print_raw_cr("thr ms ms % ms % attempts" | |
| 4207 " total alloc undo"); | |
| 4208 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
| 4209 " ------- ------- -------"); | |
| 4210 } | |
| 4211 | |
| 4212 void | |
| 4213 G1ParScanThreadState::print_termination_stats(int i, | |
| 4214 outputStream* const st) const | |
| 4215 { | |
| 4216 const double elapsed_ms = elapsed_time() * 1000.0; | |
| 4217 const double s_roots_ms = strong_roots_time() * 1000.0; | |
| 4218 const double term_ms = term_time() * 1000.0; | |
| 4219 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
| 4220 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
| 4221 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
| 4222 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
| 4223 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
| 4224 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
| 4225 alloc_buffer_waste() * HeapWordSize / K, | |
| 4226 undo_waste() * HeapWordSize / K); | |
| 4227 } | |
| 4228 | |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4229 #ifdef ASSERT |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
changeset
|
4230 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4231 assert(ref != NULL, "invariant"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4232 assert(UseCompressedOops, "sanity"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4233 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4234 oop p = oopDesc::load_decode_heap_oop(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4235 assert(_g1h->is_in_g1_reserved(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4236 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4237 return true; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4238 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4239 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4240 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4241 assert(ref != NULL, "invariant"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4242 if (has_partial_array_mask(ref)) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4243 // Must be in the collection set--it's already been copied. |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4244 oop p = clear_partial_array_mask(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4245 assert(_g1h->obj_in_cs(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4246 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4247 } else { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4248 oop p = oopDesc::load_decode_heap_oop(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4249 assert(_g1h->is_in_g1_reserved(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4250 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4251 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4252 return true; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4253 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4254 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4255 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4256 if (ref.is_narrow()) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4257 return verify_ref((narrowOop*) ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4258 } else { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4259 return verify_ref((oop*) ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4260 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4261 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4262 #endif // ASSERT |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4263 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4264 void G1ParScanThreadState::trim_queue() { |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4265 assert(_evac_cl != NULL, "not set"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4266 assert(_evac_failure_cl != NULL, "not set"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4267 assert(_partial_scan_cl != NULL, "not set"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4268 |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4269 StarTask ref; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4270 do { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4271 // Drain the overflow stack first, so other threads can steal. |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4272 while (refs()->pop_overflow(ref)) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4273 deal_with_reference(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4274 } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4275 |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4276 while (refs()->pop_local(ref)) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4277 deal_with_reference(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4278 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4279 } while (!refs()->is_empty()); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4280 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4281 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4282 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4283 G1ParScanThreadState* par_scan_state) : |
| 342 | 4284 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4285 _par_scan_state(par_scan_state), |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4286 _during_initial_mark(_g1->g1_policy()->during_initial_mark_pause()), |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4287 _mark_in_progress(_g1->mark_in_progress()) { } |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4288 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4289 void G1ParCopyHelper::mark_object(oop obj) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4290 #ifdef ASSERT |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4291 HeapRegion* hr = _g1->heap_region_containing(obj); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4292 assert(hr != NULL, "sanity"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4293 assert(!hr->in_collection_set(), "should not mark objects in the CSet"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4294 #endif // ASSERT |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4295 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4296 // We know that the object is not moving so it's safe to read its size. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4297 _cm->grayRoot(obj, (size_t) obj->size()); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4298 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4299 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4300 void G1ParCopyHelper::mark_forwarded_object(oop from_obj, oop to_obj) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4301 #ifdef ASSERT |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4302 assert(from_obj->is_forwarded(), "from obj should be forwarded"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4303 assert(from_obj->forwardee() == to_obj, "to obj should be the forwardee"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4304 assert(from_obj != to_obj, "should not be self-forwarded"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4305 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4306 HeapRegion* from_hr = _g1->heap_region_containing(from_obj); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4307 assert(from_hr != NULL, "sanity"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4308 assert(from_hr->in_collection_set(), "from obj should be in the CSet"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4309 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4310 HeapRegion* to_hr = _g1->heap_region_containing(to_obj); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4311 assert(to_hr != NULL, "sanity"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4312 assert(!to_hr->in_collection_set(), "should not mark objects in the CSet"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4313 #endif // ASSERT |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4314 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4315 // The object might be in the process of being copied by another |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4316 // worker so we cannot trust that its to-space image is |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4317 // well-formed. So we have to read its size from its from-space |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4318 // image which we know should not be changing. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4319 _cm->grayRoot(to_obj, (size_t) from_obj->size()); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
4320 } |
|
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4321 |
|
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|
4322 oop G1ParCopyHelper::copy_to_survivor_space(oop old) { |
| 342 | 4323 size_t word_sz = old->size(); |
| 4324 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
| 4325 // +1 to make the -1 indexes valid... | |
| 4326 int young_index = from_region->young_index_in_cset()+1; | |
|
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4327 assert( (from_region->is_young() && young_index > 0) || |
|
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4328 (!from_region->is_young() && young_index == 0), "invariant" ); |
| 342 | 4329 G1CollectorPolicy* g1p = _g1->g1_policy(); |
| 4330 markOop m = old->mark(); | |
| 545 | 4331 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
| 4332 : m->age(); | |
| 4333 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
| 342 | 4334 word_sz); |
| 4335 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
| 4336 oop obj = oop(obj_ptr); | |
| 4337 | |
| 4338 if (obj_ptr == NULL) { | |
| 4339 // This will either forward-to-self, or detect that someone else has | |
| 4340 // installed a forwarding pointer. | |
| 4341 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
|
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4342 return _g1->handle_evacuation_failure_par(cl, old); |
| 342 | 4343 } |
| 4344 | |
| 526 | 4345 // We're going to allocate linearly, so might as well prefetch ahead. |
| 4346 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
| 4347 | |
| 342 | 4348 oop forward_ptr = old->forward_to_atomic(obj); |
| 4349 if (forward_ptr == NULL) { | |
| 4350 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
| 526 | 4351 if (g1p->track_object_age(alloc_purpose)) { |
| 4352 // We could simply do obj->incr_age(). However, this causes a | |
| 4353 // performance issue. obj->incr_age() will first check whether | |
| 4354 // the object has a displaced mark by checking its mark word; | |
| 4355 // getting the mark word from the new location of the object | |
| 4356 // stalls. So, given that we already have the mark word and we | |
| 4357 // are about to install it anyway, it's better to increase the | |
| 4358 // age on the mark word, when the object does not have a | |
| 4359 // displaced mark word. We're not expecting many objects to have | |
| 4360 // a displaced marked word, so that case is not optimized | |
| 4361 // further (it could be...) and we simply call obj->incr_age(). | |
| 4362 | |
| 4363 if (m->has_displaced_mark_helper()) { | |
| 4364 // in this case, we have to install the mark word first, | |
| 4365 // otherwise obj looks to be forwarded (the old mark word, | |
| 4366 // which contains the forward pointer, was copied) | |
| 4367 obj->set_mark(m); | |
| 4368 obj->incr_age(); | |
| 4369 } else { | |
| 4370 m = m->incr_age(); | |
| 545 | 4371 obj->set_mark(m); |
| 526 | 4372 } |
| 545 | 4373 _par_scan_state->age_table()->add(obj, word_sz); |
| 4374 } else { | |
| 4375 obj->set_mark(m); | |
| 526 | 4376 } |
| 4377 | |
| 342 | 4378 size_t* surv_young_words = _par_scan_state->surviving_young_words(); |
| 4379 surv_young_words[young_index] += word_sz; | |
| 4380 | |
| 4381 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
|
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4382 // We keep track of the next start index in the length field of |
|
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4383 // the to-space object. The actual length can be found in the |
|
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4384 // length field of the from-space object. |
|
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4385 arrayOop(obj)->set_length(0); |
|
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4386 oop* old_p = set_partial_array_mask(old); |
|
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4387 _par_scan_state->push_on_queue(old_p); |
| 342 | 4388 } else { |
| 526 | 4389 // No point in using the slower heap_region_containing() method, |
| 4390 // given that we know obj is in the heap. | |
| 4391 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
| 342 | 4392 obj->oop_iterate_backwards(_scanner); |
| 4393 } | |
| 4394 } else { | |
| 4395 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
| 4396 obj = forward_ptr; | |
| 4397 } | |
| 4398 return obj; | |
| 4399 } | |
| 4400 | |
|
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4401 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
|
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4402 template <class T> |
|
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4403 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> |
|
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4404 ::do_oop_work(T* p) { |
|
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4405 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 4406 assert(barrier != G1BarrierRS || obj != NULL, |
|
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4407 "Precondition: G1BarrierRS implies obj is non-NULL"); |
|
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4408 |
| 526 | 4409 // here the null check is implicit in the cset_fast_test() test |
|
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4410 if (_g1->in_cset_fast_test(obj)) { |
|
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4411 oop forwardee; |
| 526 | 4412 if (obj->is_forwarded()) { |
|
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4413 forwardee = obj->forwardee(); |
| 526 | 4414 } else { |
|
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4415 forwardee = copy_to_survivor_space(obj); |
| 342 | 4416 } |
|
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|
4417 assert(forwardee != NULL, "forwardee should not be NULL"); |
|
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|
4418 oopDesc::encode_store_heap_oop(p, forwardee); |
|
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4419 if (do_mark_object && forwardee != obj) { |
|
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4420 // If the object is self-forwarded we don't need to explicitly |
|
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|
4421 // mark it, the evacuation failure protocol will do so. |
|
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|
4422 mark_forwarded_object(obj, forwardee); |
|
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|
4423 } |
|
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|
4424 |
| 526 | 4425 // When scanning the RS, we only care about objs in CS. |
| 4426 if (barrier == G1BarrierRS) { | |
|
616
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|
4427 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 342 | 4428 } |
|
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|
4429 } else { |
|
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|
4430 // The object is not in collection set. If we're a root scanning |
|
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|
4431 // closure during an initial mark pause (i.e. do_mark_object will |
|
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|
4432 // be true) then attempt to mark the object. |
|
4787
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|
4433 if (do_mark_object && _g1->is_in_g1_reserved(obj)) { |
|
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|
4434 mark_object(obj); |
|
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|
4435 } |
| 526 | 4436 } |
| 4437 | |
| 4438 if (barrier == G1BarrierEvac && obj != NULL) { | |
|
616
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|
4439 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 526 | 4440 } |
| 4441 | |
| 4442 if (do_gen_barrier && obj != NULL) { | |
| 4443 par_do_barrier(p); | |
| 4444 } | |
| 4445 } | |
| 4446 | |
|
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|
4447 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
|
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|
4448 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
|
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|
4449 |
|
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|
4450 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
| 526 | 4451 assert(has_partial_array_mask(p), "invariant"); |
|
4784
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|
4452 oop from_obj = clear_partial_array_mask(p); |
|
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|
4453 |
|
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|
4454 assert(Universe::heap()->is_in_reserved(from_obj), "must be in heap."); |
|
02838862dec8
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|
4455 assert(from_obj->is_objArray(), "must be obj array"); |
|
02838862dec8
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|
4456 objArrayOop from_obj_array = objArrayOop(from_obj); |
|
02838862dec8
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|
4457 // The from-space object contains the real length. |
|
02838862dec8
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|
4458 int length = from_obj_array->length(); |
|
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|
4459 |
|
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|
4460 assert(from_obj->is_forwarded(), "must be forwarded"); |
|
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|
4461 oop to_obj = from_obj->forwardee(); |
|
02838862dec8
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|
4462 assert(from_obj != to_obj, "should not be chunking self-forwarded objects"); |
|
02838862dec8
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|
4463 objArrayOop to_obj_array = objArrayOop(to_obj); |
|
02838862dec8
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|
4464 // We keep track of the next start index in the length field of the |
|
02838862dec8
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|
4465 // to-space object. |
|
02838862dec8
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|
4466 int next_index = to_obj_array->length(); |
|
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|
4467 assert(0 <= next_index && next_index < length, |
|
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|
4468 err_msg("invariant, next index: %d, length: %d", next_index, length)); |
|
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|
4469 |
|
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|
4470 int start = next_index; |
|
02838862dec8
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|
4471 int end = length; |
|
02838862dec8
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|
4472 int remainder = end - start; |
|
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|
4473 // We'll try not to push a range that's smaller than ParGCArrayScanChunk. |
| 342 | 4474 if (remainder > 2 * ParGCArrayScanChunk) { |
| 4475 end = start + ParGCArrayScanChunk; | |
|
4784
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|
4476 to_obj_array->set_length(end); |
|
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|
4477 // Push the remainder before we process the range in case another |
|
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|
4478 // worker has run out of things to do and can steal it. |
|
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|
4479 oop* from_obj_p = set_partial_array_mask(from_obj); |
|
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|
4480 _par_scan_state->push_on_queue(from_obj_p); |
| 342 | 4481 } else { |
|
4784
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|
4482 assert(length == end, "sanity"); |
|
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|
4483 // We'll process the final range for this object. Restore the length |
|
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|
4484 // so that the heap remains parsable in case of evacuation failure. |
|
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|
4485 to_obj_array->set_length(end); |
|
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|
4486 } |
|
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|
4487 _scanner.set_region(_g1->heap_region_containing_raw(to_obj)); |
|
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|
4488 // Process indexes [start,end). It will also process the header |
|
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|
4489 // along with the first chunk (i.e., the chunk with start == 0). |
|
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|
4490 // Note that at this point the length field of to_obj_array is not |
|
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|
4491 // correct given that we are using it to keep track of the next |
|
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|
4492 // start index. oop_iterate_range() (thankfully!) ignores the length |
|
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|
4493 // field and only relies on the start / end parameters. It does |
|
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|
4494 // however return the size of the object which will be incorrect. So |
|
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|
4495 // we have to ignore it even if we wanted to use it. |
|
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|
4496 to_obj_array->oop_iterate_range(&_scanner, start, end); |
| 342 | 4497 } |
| 4498 | |
| 4499 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
| 4500 protected: | |
| 4501 G1CollectedHeap* _g1h; | |
| 4502 G1ParScanThreadState* _par_scan_state; | |
| 4503 RefToScanQueueSet* _queues; | |
| 4504 ParallelTaskTerminator* _terminator; | |
| 4505 | |
| 4506 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
| 4507 RefToScanQueueSet* queues() { return _queues; } | |
| 4508 ParallelTaskTerminator* terminator() { return _terminator; } | |
| 4509 | |
| 4510 public: | |
| 4511 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
| 4512 G1ParScanThreadState* par_scan_state, | |
| 4513 RefToScanQueueSet* queues, | |
| 4514 ParallelTaskTerminator* terminator) | |
| 4515 : _g1h(g1h), _par_scan_state(par_scan_state), | |
| 4516 _queues(queues), _terminator(terminator) {} | |
| 4517 | |
|
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4518 void do_void(); |
|
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4519 |
|
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|
4520 private: |
|
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|
4521 inline bool offer_termination(); |
|
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|
4522 }; |
|
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|
4523 |
|
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|
4524 bool G1ParEvacuateFollowersClosure::offer_termination() { |
|
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4525 G1ParScanThreadState* const pss = par_scan_state(); |
|
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4526 pss->start_term_time(); |
|
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4527 const bool res = terminator()->offer_termination(); |
|
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4528 pss->end_term_time(); |
|
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|
4529 return res; |
|
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|
4530 } |
|
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|
4531 |
|
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|
4532 void G1ParEvacuateFollowersClosure::do_void() { |
|
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4533 StarTask stolen_task; |
|
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4534 G1ParScanThreadState* const pss = par_scan_state(); |
|
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4535 pss->trim_queue(); |
|
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4536 |
|
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|
4537 do { |
|
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|
4538 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
|
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4539 assert(pss->verify_task(stolen_task), "sanity"); |
|
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4540 if (stolen_task.is_narrow()) { |
|
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|
4541 pss->deal_with_reference((narrowOop*) stolen_task); |
|
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4542 } else { |
|
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4543 pss->deal_with_reference((oop*) stolen_task); |
|
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4544 } |
|
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4545 |
|
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4546 // We've just processed a reference and we might have made |
|
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4547 // available new entries on the queues. So we have to make sure |
|
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|
4548 // we drain the queues as necessary. |
| 342 | 4549 pss->trim_queue(); |
| 4550 } | |
|
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|
4551 } while (!offer_termination()); |
|
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4552 |
|
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|
4553 pss->retire_alloc_buffers(); |
|
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|
4554 } |
| 342 | 4555 |
| 4556 class G1ParTask : public AbstractGangTask { | |
| 4557 protected: | |
| 4558 G1CollectedHeap* _g1h; | |
| 4559 RefToScanQueueSet *_queues; | |
| 4560 ParallelTaskTerminator _terminator; | |
|
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|
4561 uint _n_workers; |
| 342 | 4562 |
| 4563 Mutex _stats_lock; | |
| 4564 Mutex* stats_lock() { return &_stats_lock; } | |
| 4565 | |
| 4566 size_t getNCards() { | |
| 4567 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
| 4568 / G1BlockOffsetSharedArray::N_bytes; | |
| 4569 } | |
| 4570 | |
| 4571 public: | |
|
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|
4572 G1ParTask(G1CollectedHeap* g1h, |
|
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|
4573 RefToScanQueueSet *task_queues) |
| 342 | 4574 : AbstractGangTask("G1 collection"), |
| 4575 _g1h(g1h), | |
| 4576 _queues(task_queues), | |
|
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|
4577 _terminator(0, _queues), |
|
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|
4578 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true) |
| 342 | 4579 {} |
| 4580 | |
| 4581 RefToScanQueueSet* queues() { return _queues; } | |
| 4582 | |
| 4583 RefToScanQueue *work_queue(int i) { | |
| 4584 return queues()->queue(i); | |
| 4585 } | |
| 4586 | |
|
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|
4587 ParallelTaskTerminator* terminator() { return &_terminator; } |
|
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4588 |
|
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|
4589 virtual void set_for_termination(int active_workers) { |
|
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|
4590 // This task calls set_n_termination() in par_non_clean_card_iterate_work() |
|
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4591 // in the young space (_par_seq_tasks) in the G1 heap |
|
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|
4592 // for SequentialSubTasksDone. |
|
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4593 // This task also uses SubTasksDone in SharedHeap and G1CollectedHeap |
|
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|
4594 // both of which need setting by set_n_termination(). |
|
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|
4595 _g1h->SharedHeap::set_n_termination(active_workers); |
|
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|
4596 _g1h->set_n_termination(active_workers); |
|
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|
4597 terminator()->reset_for_reuse(active_workers); |
|
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|
4598 _n_workers = active_workers; |
|
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|
4599 } |
|
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|
4600 |
|
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|
4601 void work(uint worker_id) { |
|
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|
4602 if (worker_id >= _n_workers) return; // no work needed this round |
| 1611 | 4603 |
| 4604 double start_time_ms = os::elapsedTime() * 1000.0; | |
|
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|
4605 _g1h->g1_policy()->record_gc_worker_start_time(worker_id, start_time_ms); |
| 1611 | 4606 |
| 342 | 4607 ResourceMark rm; |
| 4608 HandleMark hm; | |
| 4609 | |
|
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|
4610 ReferenceProcessor* rp = _g1h->ref_processor_stw(); |
|
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|
4611 |
|
4728
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|
4612 G1ParScanThreadState pss(_g1h, worker_id); |
|
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|
4613 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, rp); |
|
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|
4614 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, rp); |
|
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|
4615 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, rp); |
| 342 | 4616 |
| 4617 pss.set_evac_closure(&scan_evac_cl); | |
| 4618 pss.set_evac_failure_closure(&evac_failure_cl); | |
| 4619 pss.set_partial_scan_closure(&partial_scan_cl); | |
| 4620 | |
|
3979
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|
4621 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss, rp); |
|
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|
4622 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss, rp); |
|
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|
4623 |
|
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|
4624 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss, rp); |
|
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|
4625 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss, rp); |
|
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|
4626 |
|
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|
4627 OopClosure* scan_root_cl = &only_scan_root_cl; |
|
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|
4628 OopsInHeapRegionClosure* scan_perm_cl = &only_scan_perm_cl; |
| 342 | 4629 |
|
1359
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
4630 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
3979
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|
4631 // We also need to mark copied objects. |
| 342 | 4632 scan_root_cl = &scan_mark_root_cl; |
| 4633 scan_perm_cl = &scan_mark_perm_cl; | |
| 4634 } | |
| 4635 | |
|
3983
811ec3d0833b
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diff
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|
4636 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
|
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|
4637 |
| 342 | 4638 pss.start_strong_roots(); |
| 4639 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
| 4640 SharedHeap::SO_AllClasses, | |
| 4641 scan_root_cl, | |
|
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diff
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|
4642 &push_heap_rs_cl, |
| 342 | 4643 scan_perm_cl, |
|
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|
4644 worker_id); |
| 342 | 4645 pss.end_strong_roots(); |
|
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|
4646 |
| 342 | 4647 { |
| 4648 double start = os::elapsedTime(); | |
| 4649 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
| 4650 evac.do_void(); | |
| 4651 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
| 4652 double term_ms = pss.term_time()*1000.0; | |
|
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|
4653 _g1h->g1_policy()->record_obj_copy_time(worker_id, elapsed_ms-term_ms); |
|
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|
4654 _g1h->g1_policy()->record_termination(worker_id, term_ms, pss.term_attempts()); |
| 342 | 4655 } |
| 1282 | 4656 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
| 342 | 4657 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
| 4658 | |
| 4659 // Clean up any par-expanded rem sets. | |
| 4660 HeapRegionRemSet::par_cleanup(); | |
| 4661 | |
| 4662 if (ParallelGCVerbose) { | |
| 1709 | 4663 MutexLocker x(stats_lock()); |
|
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|
4664 pss.print_termination_stats(worker_id); |
| 342 | 4665 } |
| 4666 | |
|
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|
4667 assert(pss.refs()->is_empty(), "should be empty"); |
| 1611 | 4668 double end_time_ms = os::elapsedTime() * 1000.0; |
|
4728
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|
4669 _g1h->g1_policy()->record_gc_worker_end_time(worker_id, end_time_ms); |
| 342 | 4670 } |
| 4671 }; | |
| 4672 | |
| 4673 // *** Common G1 Evacuation Stuff | |
| 4674 | |
|
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6984287: Regularize how GC parallel workers are specified.
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|
4675 // This method is run in a GC worker. |
|
8b10f48633dc
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|
4676 |
| 342 | 4677 void |
| 4678 G1CollectedHeap:: | |
| 4679 g1_process_strong_roots(bool collecting_perm_gen, | |
| 4680 SharedHeap::ScanningOption so, | |
| 4681 OopClosure* scan_non_heap_roots, | |
| 4682 OopsInHeapRegionClosure* scan_rs, | |
| 4683 OopsInGenClosure* scan_perm, | |
| 4684 int worker_i) { | |
|
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|
4685 |
| 342 | 4686 // First scan the strong roots, including the perm gen. |
| 4687 double ext_roots_start = os::elapsedTime(); | |
| 4688 double closure_app_time_sec = 0.0; | |
| 4689 | |
| 4690 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
| 4691 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
| 4692 buf_scan_perm.set_generation(perm_gen()); | |
| 4693 | |
|
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|
4694 // Walk the code cache w/o buffering, because StarTask cannot handle |
|
148e5441d916
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|
4695 // unaligned oop locations. |
|
148e5441d916
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changeset
|
4696 CodeBlobToOopClosure eager_scan_code_roots(scan_non_heap_roots, /*do_marking=*/ true); |
|
148e5441d916
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|
4697 |
|
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changeset
|
4698 process_strong_roots(false, // no scoping; this is parallel code |
|
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|
4699 collecting_perm_gen, so, |
| 342 | 4700 &buf_scan_non_heap_roots, |
|
989
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diff
changeset
|
4701 &eager_scan_code_roots, |
| 342 | 4702 &buf_scan_perm); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
4703 |
|
3979
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|
4704 // Now the CM ref_processor roots. |
|
3823
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7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
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diff
changeset
|
4705 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { |
|
3979
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|
4706 // We need to treat the discovered reference lists of the |
|
4dfb2df418f2
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changeset
|
4707 // concurrent mark ref processor as roots and keep entries |
|
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|
4708 // (which are added by the marking threads) on them live |
|
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|
4709 // until they can be processed at the end of marking. |
|
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changeset
|
4710 ref_processor_cm()->weak_oops_do(&buf_scan_non_heap_roots); |
|
3823
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|
4711 } |
|
14a2fd14c0db
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changeset
|
4712 |
|
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changeset
|
4713 // Finish up any enqueued closure apps (attributed as object copy time). |
| 342 | 4714 buf_scan_non_heap_roots.done(); |
| 4715 buf_scan_perm.done(); | |
|
3823
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|
4716 |
| 342 | 4717 double ext_roots_end = os::elapsedTime(); |
|
3823
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|
4718 |
| 342 | 4719 g1_policy()->reset_obj_copy_time(worker_i); |
|
3823
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changeset
|
4720 double obj_copy_time_sec = buf_scan_perm.closure_app_seconds() + |
|
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changeset
|
4721 buf_scan_non_heap_roots.closure_app_seconds(); |
| 342 | 4722 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); |
|
3823
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|
4723 |
| 342 | 4724 double ext_root_time_ms = |
| 4725 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
|
3823
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|
4726 |
| 342 | 4727 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); |
| 4728 | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4785
diff
changeset
|
4729 // During conc marking we have to filter the per-thread SATB buffers |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4730 // to make sure we remove any oops into the CSet (which will show up |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4731 // as implicitly live). |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4732 if (!_process_strong_tasks->is_task_claimed(G1H_PS_filter_satb_buffers)) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4733 if (mark_in_progress()) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4734 JavaThread::satb_mark_queue_set().filter_thread_buffers(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4735 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4736 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4737 double satb_filtering_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4738 g1_policy()->record_satb_filtering_time(worker_i, satb_filtering_ms); |
| 342 | 4739 |
| 4740 // Now scan the complement of the collection set. | |
| 4741 if (scan_rs != NULL) { | |
| 4742 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
| 4743 } | |
|
3823
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|
4744 |
| 342 | 4745 _process_strong_tasks->all_tasks_completed(); |
| 4746 } | |
| 4747 | |
| 4748 void | |
| 4749 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
| 4750 OopClosure* non_root_closure) { | |
|
989
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parents:
890
diff
changeset
|
4751 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
|
148e5441d916
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diff
changeset
|
4752 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
| 342 | 4753 } |
| 4754 | |
|
3979
4dfb2df418f2
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diff
changeset
|
4755 // Weak Reference Processing support |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4756 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
4757 // An always "is_alive" closure that is used to preserve referents. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4758 // If the object is non-null then it's alive. Used in the preservation |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4759 // of referent objects that are pointed to by reference objects |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4760 // discovered by the CM ref processor. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4761 class G1AlwaysAliveClosure: public BoolObjectClosure { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4762 G1CollectedHeap* _g1; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4763 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4764 G1AlwaysAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4765 void do_object(oop p) { assert(false, "Do not call."); } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4766 bool do_object_b(oop p) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4767 if (p != NULL) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4768 return true; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4769 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4770 return false; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4771 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4772 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4773 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4774 bool G1STWIsAliveClosure::do_object_b(oop p) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4775 // An object is reachable if it is outside the collection set, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4776 // or is inside and copied. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4777 return !_g1->obj_in_cs(p) || p->is_forwarded(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4778 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4779 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4780 // Non Copying Keep Alive closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4781 class G1KeepAliveClosure: public OopClosure { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4782 G1CollectedHeap* _g1; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4783 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4784 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4785 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4786 void do_oop( oop* p) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4787 oop obj = *p; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4788 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4789 if (_g1->obj_in_cs(obj)) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4790 assert( obj->is_forwarded(), "invariant" ); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4791 *p = obj->forwardee(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4792 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4793 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4794 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4795 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4796 // Copying Keep Alive closure - can be called from both |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4797 // serial and parallel code as long as different worker |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4798 // threads utilize different G1ParScanThreadState instances |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4799 // and different queues. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4800 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4801 class G1CopyingKeepAliveClosure: public OopClosure { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4802 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4803 OopClosure* _copy_non_heap_obj_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4804 OopsInHeapRegionClosure* _copy_perm_obj_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4805 G1ParScanThreadState* _par_scan_state; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4806 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4807 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4808 G1CopyingKeepAliveClosure(G1CollectedHeap* g1h, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4809 OopClosure* non_heap_obj_cl, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4810 OopsInHeapRegionClosure* perm_obj_cl, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4811 G1ParScanThreadState* pss): |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4812 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4813 _copy_non_heap_obj_cl(non_heap_obj_cl), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4814 _copy_perm_obj_cl(perm_obj_cl), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4815 _par_scan_state(pss) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4816 {} |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4817 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4818 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4819 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4820 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4821 template <class T> void do_oop_work(T* p) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4822 oop obj = oopDesc::load_decode_heap_oop(p); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4823 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4824 if (_g1h->obj_in_cs(obj)) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4825 // If the referent object has been forwarded (either copied |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4826 // to a new location or to itself in the event of an |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4827 // evacuation failure) then we need to update the reference |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4828 // field and, if both reference and referent are in the G1 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4829 // heap, update the RSet for the referent. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4830 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4831 // If the referent has not been forwarded then we have to keep |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4832 // it alive by policy. Therefore we have copy the referent. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4833 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4834 // If the reference field is in the G1 heap then we can push |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4835 // on the PSS queue. When the queue is drained (after each |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4836 // phase of reference processing) the object and it's followers |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
4837 // will be copied, the reference field set to point to the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4838 // new location, and the RSet updated. Otherwise we need to |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4839 // use the the non-heap or perm closures directly to copy |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4840 // the refernt object and update the pointer, while avoiding |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4841 // updating the RSet. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4842 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4843 if (_g1h->is_in_g1_reserved(p)) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4844 _par_scan_state->push_on_queue(p); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4845 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4846 // The reference field is not in the G1 heap. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4847 if (_g1h->perm_gen()->is_in(p)) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4848 _copy_perm_obj_cl->do_oop(p); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4849 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4850 _copy_non_heap_obj_cl->do_oop(p); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
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|
4851 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4852 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4853 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4854 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4855 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4856 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4857 // Serial drain queue closure. Called as the 'complete_gc' |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4858 // closure for each discovered list in some of the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4859 // reference processing phases. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4860 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4861 class G1STWDrainQueueClosure: public VoidClosure { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4862 protected: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4863 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
4864 G1ParScanThreadState* _par_scan_state; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4865 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4866 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4867 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4868 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4869 G1STWDrainQueueClosure(G1CollectedHeap* g1h, G1ParScanThreadState* pss) : |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4870 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4871 _par_scan_state(pss) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4872 { } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4873 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4874 void do_void() { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4875 G1ParScanThreadState* const pss = par_scan_state(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4876 pss->trim_queue(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4877 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4878 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4879 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4880 // Parallel Reference Processing closures |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4881 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4882 // Implementation of AbstractRefProcTaskExecutor for parallel reference |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4883 // processing during G1 evacuation pauses. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4884 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4885 class G1STWRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4886 private: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4887 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4888 RefToScanQueueSet* _queues; |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
4889 FlexibleWorkGang* _workers; |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4890 int _active_workers; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4891 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4892 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4893 G1STWRefProcTaskExecutor(G1CollectedHeap* g1h, |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
4894 FlexibleWorkGang* workers, |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4895 RefToScanQueueSet *task_queues, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4896 int n_workers) : |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4897 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4898 _queues(task_queues), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4899 _workers(workers), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4900 _active_workers(n_workers) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4901 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4902 assert(n_workers > 0, "shouldn't call this otherwise"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4903 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4904 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4905 // Executes the given task using concurrent marking worker threads. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4906 virtual void execute(ProcessTask& task); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4907 virtual void execute(EnqueueTask& task); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4908 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4909 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4910 // Gang task for possibly parallel reference processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4911 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4912 class G1STWRefProcTaskProxy: public AbstractGangTask { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4913 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4914 ProcessTask& _proc_task; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4915 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4916 RefToScanQueueSet *_task_queues; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4917 ParallelTaskTerminator* _terminator; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4918 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4919 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4920 G1STWRefProcTaskProxy(ProcessTask& proc_task, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4921 G1CollectedHeap* g1h, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4922 RefToScanQueueSet *task_queues, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4923 ParallelTaskTerminator* terminator) : |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4924 AbstractGangTask("Process reference objects in parallel"), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4925 _proc_task(proc_task), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4926 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4927 _task_queues(task_queues), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4928 _terminator(terminator) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4929 {} |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4930 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
4931 virtual void work(uint worker_id) { |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4932 // The reference processing task executed by a single worker. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4933 ResourceMark rm; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4934 HandleMark hm; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4935 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4936 G1STWIsAliveClosure is_alive(_g1h); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4937 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
4938 G1ParScanThreadState pss(_g1h, worker_id); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4939 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4940 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4941 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4942 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4943 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4944 pss.set_evac_closure(&scan_evac_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4945 pss.set_evac_failure_closure(&evac_failure_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4946 pss.set_partial_scan_closure(&partial_scan_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4947 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4948 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4949 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4950 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4951 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4952 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4953 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4954 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4955 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4956 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4957 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4958 // We also need to mark copied objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4959 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4960 copy_perm_cl = ©_mark_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4961 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4962 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4963 // Keep alive closure. |
|
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|
4964 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
|
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|
4965 |
|
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|
4966 // Complete GC closure |
|
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|
4967 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _task_queues, _terminator); |
|
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|
4968 |
|
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|
4969 // Call the reference processing task's work routine. |
|
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|
4970 _proc_task.work(worker_id, is_alive, keep_alive, drain_queue); |
|
3979
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|
4971 |
|
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|
4972 // Note we cannot assert that the refs array is empty here as not all |
|
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|
4973 // of the processing tasks (specifically phase2 - pp2_work) execute |
|
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|
4974 // the complete_gc closure (which ordinarily would drain the queue) so |
|
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|
4975 // the queue may not be empty. |
|
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|
4976 } |
|
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|
4977 }; |
|
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|
4978 |
|
4dfb2df418f2
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|
4979 // Driver routine for parallel reference processing. |
|
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|
4980 // Creates an instance of the ref processing gang |
|
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|
4981 // task and has the worker threads execute it. |
|
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|
4982 void G1STWRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
|
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|
4983 assert(_workers != NULL, "Need parallel worker threads."); |
|
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|
4984 |
|
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|
4985 ParallelTaskTerminator terminator(_active_workers, _queues); |
|
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|
4986 G1STWRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _queues, &terminator); |
|
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|
4987 |
|
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|
4988 _g1h->set_par_threads(_active_workers); |
|
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|
4989 _workers->run_task(&proc_task_proxy); |
|
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|
4990 _g1h->set_par_threads(0); |
|
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|
4991 } |
|
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|
4992 |
|
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|
4993 // Gang task for parallel reference enqueueing. |
|
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|
4994 |
|
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|
4995 class G1STWRefEnqueueTaskProxy: public AbstractGangTask { |
|
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|
4996 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
|
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|
4997 EnqueueTask& _enq_task; |
|
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|
4998 |
|
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|
4999 public: |
|
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|
5000 G1STWRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
|
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|
5001 AbstractGangTask("Enqueue reference objects in parallel"), |
|
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|
5002 _enq_task(enq_task) |
|
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|
5003 { } |
|
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|
5004 |
|
4728
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|
5005 virtual void work(uint worker_id) { |
|
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|
5006 _enq_task.work(worker_id); |
|
3979
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|
5007 } |
|
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|
5008 }; |
|
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changeset
|
5009 |
|
4dfb2df418f2
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|
5010 // Driver routine for parallel reference enqueing. |
|
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|
5011 // Creates an instance of the ref enqueueing gang |
|
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|
5012 // task and has the worker threads execute it. |
|
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changeset
|
5013 |
|
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changeset
|
5014 void G1STWRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
|
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|
5015 assert(_workers != NULL, "Need parallel worker threads."); |
|
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|
5016 |
|
4dfb2df418f2
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diff
changeset
|
5017 G1STWRefEnqueueTaskProxy enq_task_proxy(enq_task); |
|
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changeset
|
5018 |
|
4dfb2df418f2
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diff
changeset
|
5019 _g1h->set_par_threads(_active_workers); |
|
4dfb2df418f2
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changeset
|
5020 _workers->run_task(&enq_task_proxy); |
|
4dfb2df418f2
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changeset
|
5021 _g1h->set_par_threads(0); |
|
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parents:
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|
5022 } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5023 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5024 // End of weak reference support closures |
|
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parents:
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diff
changeset
|
5025 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5026 // Abstract task used to preserve (i.e. copy) any referent objects |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5027 // that are in the collection set and are pointed to by reference |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5028 // objects discovered by the CM ref processor. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5029 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5030 class G1ParPreserveCMReferentsTask: public AbstractGangTask { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5031 protected: |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5032 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5033 RefToScanQueueSet *_queues; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5034 ParallelTaskTerminator _terminator; |
|
4728
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changeset
|
5035 uint _n_workers; |
|
3979
4dfb2df418f2
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parents:
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changeset
|
5036 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5037 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5038 G1ParPreserveCMReferentsTask(G1CollectedHeap* g1h,int workers, RefToScanQueueSet *task_queues) : |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5039 AbstractGangTask("ParPreserveCMReferents"), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5040 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5041 _queues(task_queues), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5042 _terminator(workers, _queues), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5043 _n_workers(workers) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5044 { } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5045 |
|
4728
441e946dc1af
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parents:
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diff
changeset
|
5046 void work(uint worker_id) { |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5047 ResourceMark rm; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5048 HandleMark hm; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5049 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
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diff
changeset
|
5050 G1ParScanThreadState pss(_g1h, worker_id); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5051 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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diff
changeset
|
5052 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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diff
changeset
|
5053 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5054 |
|
4dfb2df418f2
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diff
changeset
|
5055 pss.set_evac_closure(&scan_evac_cl); |
|
4dfb2df418f2
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diff
changeset
|
5056 pss.set_evac_failure_closure(&evac_failure_cl); |
|
4dfb2df418f2
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diff
changeset
|
5057 pss.set_partial_scan_closure(&partial_scan_cl); |
|
4dfb2df418f2
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diff
changeset
|
5058 |
|
4dfb2df418f2
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diff
changeset
|
5059 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5060 |
|
4dfb2df418f2
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diff
changeset
|
5061 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5062 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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diff
changeset
|
5063 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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diff
changeset
|
5064 |
|
4dfb2df418f2
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diff
changeset
|
5065 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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diff
changeset
|
5066 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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diff
changeset
|
5067 |
|
4dfb2df418f2
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diff
changeset
|
5068 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
4dfb2df418f2
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diff
changeset
|
5069 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
4dfb2df418f2
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diff
changeset
|
5070 |
|
4dfb2df418f2
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diff
changeset
|
5071 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5072 // We also need to mark copied objects. |
|
4dfb2df418f2
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diff
changeset
|
5073 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
4dfb2df418f2
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diff
changeset
|
5074 copy_perm_cl = ©_mark_perm_cl; |
|
4dfb2df418f2
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diff
changeset
|
5075 } |
|
4dfb2df418f2
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3973
diff
changeset
|
5076 |
|
4dfb2df418f2
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diff
changeset
|
5077 // Is alive closure |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5078 G1AlwaysAliveClosure always_alive(_g1h); |
|
4dfb2df418f2
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diff
changeset
|
5079 |
|
4dfb2df418f2
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diff
changeset
|
5080 // Copying keep alive closure. Applied to referent objects that need |
|
4dfb2df418f2
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3973
diff
changeset
|
5081 // to be copied. |
|
4dfb2df418f2
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3973
diff
changeset
|
5082 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
|
4dfb2df418f2
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diff
changeset
|
5083 |
|
4dfb2df418f2
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diff
changeset
|
5084 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
|
4dfb2df418f2
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diff
changeset
|
5085 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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4711
diff
changeset
|
5086 uint limit = ReferenceProcessor::number_of_subclasses_of_ref() * rp->max_num_q(); |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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changeset
|
5087 uint stride = MIN2(MAX2(_n_workers, 1U), limit); |
|
3979
4dfb2df418f2
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changeset
|
5088 |
|
4dfb2df418f2
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diff
changeset
|
5089 // limit is set using max_num_q() - which was set using ParallelGCThreads. |
|
4dfb2df418f2
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diff
changeset
|
5090 // So this must be true - but assert just in case someone decides to |
|
4dfb2df418f2
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changeset
|
5091 // change the worker ids. |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5092 assert(0 <= worker_id && worker_id < limit, "sanity"); |
|
3979
4dfb2df418f2
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|
5093 assert(!rp->discovery_is_atomic(), "check this code"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5094 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5095 // Select discovered lists [i, i+stride, i+2*stride,...,limit) |
|
4728
441e946dc1af
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jmasa
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|
5096 for (uint idx = worker_id; idx < limit; idx += stride) { |
|
4014
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
4013
diff
changeset
|
5097 DiscoveredList& ref_list = rp->discovered_refs()[idx]; |
|
3979
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changeset
|
5098 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5099 DiscoveredListIterator iter(ref_list, &keep_alive, &always_alive); |
|
4dfb2df418f2
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changeset
|
5100 while (iter.has_next()) { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5101 // Since discovery is not atomic for the CM ref processor, we |
|
4dfb2df418f2
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diff
changeset
|
5102 // can see some null referent objects. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5103 iter.load_ptrs(DEBUG_ONLY(true)); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5104 oop ref = iter.obj(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5105 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5106 // This will filter nulls. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5107 if (iter.is_referent_alive()) { |
|
4dfb2df418f2
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changeset
|
5108 iter.make_referent_alive(); |
|
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diff
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|
5109 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5110 iter.move_to_next(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5111 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5112 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5113 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5114 // Drain the queue - which may cause stealing |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5115 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _queues, &_terminator); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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changeset
|
5116 drain_queue.do_void(); |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5117 // Allocation buffers were retired at the end of G1ParEvacuateFollowersClosure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5118 assert(pss.refs()->is_empty(), "should be"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5119 } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5120 }; |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5121 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5122 // Weak Reference processing during an evacuation pause (part 1). |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5123 void G1CollectedHeap::process_discovered_references() { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5124 double ref_proc_start = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5125 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5126 ReferenceProcessor* rp = _ref_processor_stw; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5127 assert(rp->discovery_enabled(), "should have been enabled"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5128 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5129 // Any reference objects, in the collection set, that were 'discovered' |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5130 // by the CM ref processor should have already been copied (either by |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5131 // applying the external root copy closure to the discovered lists, or |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5132 // by following an RSet entry). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5133 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5134 // But some of the referents, that are in the collection set, that these |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5135 // reference objects point to may not have been copied: the STW ref |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5136 // processor would have seen that the reference object had already |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5137 // been 'discovered' and would have skipped discovering the reference, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5138 // 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
|
5139 // 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
|
5140 // referent object. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5141 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5142 // We need to explicitly copy these referent objects - the references |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5143 // will be processed at the end of remarking. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5144 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5145 // 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
|
5146 // 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
|
5147 // referents points to another object which is also referenced by an |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5148 // object discovered by the STW ref processor. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5149 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5150 uint active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5151 workers()->active_workers() : 1); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5152 |
| 4711 | 5153 assert(!G1CollectedHeap::use_parallel_gc_threads() || |
| 5154 active_workers == workers()->active_workers(), | |
| 5155 "Need to reset active_workers"); | |
| 5156 | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5157 set_par_threads(active_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5158 G1ParPreserveCMReferentsTask keep_cm_referents(this, active_workers, _task_queues); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5159 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5160 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5161 workers()->run_task(&keep_cm_referents); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5162 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5163 keep_cm_referents.work(0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5164 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5165 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5166 set_par_threads(0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5167 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5168 // Closure to test whether a referent is alive. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5169 G1STWIsAliveClosure is_alive(this); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5170 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5171 // Even when parallel reference processing is enabled, the processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5172 // 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
|
5173 // 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
|
5174 // JNI refs. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5175 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5176 // Use only a single queue for this PSS. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5177 G1ParScanThreadState pss(this, 0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5178 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5179 // We do not embed a reference processor in the copying/scanning |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5180 // closures while we're actually processing the discovered |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5181 // reference objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5182 G1ParScanHeapEvacClosure scan_evac_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5183 G1ParScanHeapEvacFailureClosure evac_failure_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5184 G1ParScanPartialArrayClosure partial_scan_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5185 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5186 pss.set_evac_closure(&scan_evac_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5187 pss.set_evac_failure_closure(&evac_failure_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5188 pss.set_partial_scan_closure(&partial_scan_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5189 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5190 assert(pss.refs()->is_empty(), "pre-condition"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5191 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5192 G1ParScanExtRootClosure only_copy_non_heap_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5193 G1ParScanPermClosure only_copy_perm_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5194 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5195 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5196 G1ParScanAndMarkPermClosure copy_mark_perm_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5197 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5198 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5199 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5200 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5201 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5202 // We also need to mark copied objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5203 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5204 copy_perm_cl = ©_mark_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5205 } |
|
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 // Keep alive closure. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5208 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
|
5209 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5210 // Serial Complete GC closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5211 G1STWDrainQueueClosure drain_queue(this, &pss); |
|
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 // Setup the soft refs policy... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5214 rp->setup_policy(false); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5215 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5216 if (!rp->processing_is_mt()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5217 // Serial reference processing... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5218 rp->process_discovered_references(&is_alive, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5219 &keep_alive, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5220 &drain_queue, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5221 NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5222 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5223 // Parallel reference processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5224 assert(rp->num_q() == active_workers, "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5225 assert(active_workers <= rp->max_num_q(), "sanity"); |
|
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 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5228 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
|
5229 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5230 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5231 // We have completed copying any necessary live referent objects |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5232 // (that were not copied during the actual pause) so we can |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5233 // retire any active alloc buffers |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5234 pss.retire_alloc_buffers(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5235 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
|
5236 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5237 double ref_proc_time = os::elapsedTime() - ref_proc_start; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5238 g1_policy()->record_ref_proc_time(ref_proc_time * 1000.0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5239 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5240 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5241 // Weak Reference processing during an evacuation pause (part 2). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5242 void G1CollectedHeap::enqueue_discovered_references() { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5243 double ref_enq_start = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5244 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5245 ReferenceProcessor* rp = _ref_processor_stw; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5246 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
|
5247 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5248 // Now enqueue any remaining on the discovered lists on to |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5249 // the pending list. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5250 if (!rp->processing_is_mt()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5251 // Serial reference processing... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5252 rp->enqueue_discovered_references(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5253 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5254 // Parallel reference enqueuing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5255 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5256 uint active_workers = (ParallelGCThreads > 0 ? workers()->active_workers() : 1); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5257 assert(active_workers == workers()->active_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5258 "Need to reset active_workers"); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5259 assert(rp->num_q() == active_workers, "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5260 assert(active_workers <= rp->max_num_q(), "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5261 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5262 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5263 rp->enqueue_discovered_references(&par_task_executor); |
|
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 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5266 rp->verify_no_references_recorded(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5267 assert(!rp->discovery_enabled(), "should have been disabled"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5268 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5269 // FIXME |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5270 // 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
|
5271 // 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
|
5272 // and could signicantly increase the pause time. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5273 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5274 double ref_enq_time = os::elapsedTime() - ref_enq_start; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5275 g1_policy()->record_ref_enq_time(ref_enq_time * 1000.0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5276 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5277 |
| 342 | 5278 void G1CollectedHeap::evacuate_collection_set() { |
|
4781
bacb651cf5bf
7113006: G1: excessive ergo output when an evac failure happens
tonyp
parents:
4728
diff
changeset
|
5279 _expand_heap_after_alloc_failure = true; |
| 342 | 5280 set_evacuation_failed(false); |
| 5281 | |
| 5282 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
| 5283 concurrent_g1_refine()->set_use_cache(false); | |
| 889 | 5284 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
| 5285 | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5286 uint n_workers; |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5287 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5288 n_workers = |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5289 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5290 workers()->active_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5291 Threads::number_of_non_daemon_threads()); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5292 assert(UseDynamicNumberOfGCThreads || |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5293 n_workers == workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5294 "If not dynamic should be using all the workers"); |
| 4711 | 5295 workers()->set_active_workers(n_workers); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5296 set_par_threads(n_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5297 } else { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5298 assert(n_par_threads() == 0, |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5299 "Should be the original non-parallel value"); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5300 n_workers = 1; |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5301 } |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5302 |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5303 G1ParTask g1_par_task(this, _task_queues); |
| 342 | 5304 |
| 5305 init_for_evac_failure(NULL); | |
| 5306 | |
| 5307 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
|
5308 |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5309 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
| 342 | 5310 double start_par = os::elapsedTime(); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5311 |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
5312 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 5313 // 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
|
5314 StrongRootsScope srs(this); |
| 1709 | 5315 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5316 // These tasks use ShareHeap::_process_strong_tasks |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5317 assert(UseDynamicNumberOfGCThreads || |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5318 workers()->active_workers() == workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5319 "If not dynamic should be using all the workers"); |
| 342 | 5320 workers()->run_task(&g1_par_task); |
| 5321 } else { | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5322 StrongRootsScope srs(this); |
| 4711 | 5323 g1_par_task.set_for_termination(n_workers); |
| 342 | 5324 g1_par_task.work(0); |
| 5325 } | |
| 5326 | |
| 5327 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
| 5328 g1_policy()->record_par_time(par_time); | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5329 |
| 342 | 5330 set_par_threads(0); |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5331 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5332 // Process any discovered reference objects - we have |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5333 // to do this _before_ we retire the GC alloc regions |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5334 // as we may have to copy some 'reachable' referent |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5335 // objects (and their reachable sub-graphs) that were |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5336 // not copied during the pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5337 process_discovered_references(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5338 |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5339 // Weak root processing. |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5340 // 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
|
5341 // 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
|
5342 // here too. |
| 342 | 5343 { |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5344 G1STWIsAliveClosure is_alive(this); |
| 342 | 5345 G1KeepAliveClosure keep_alive(this); |
| 5346 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
| 5347 } | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5348 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5349 release_gc_alloc_regions(); |
| 342 | 5350 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
|
5351 |
| 889 | 5352 concurrent_g1_refine()->clear_hot_cache(); |
| 342 | 5353 concurrent_g1_refine()->set_use_cache(true); |
| 5354 | |
| 5355 finalize_for_evac_failure(); | |
| 5356 | |
| 5357 if (evacuation_failed()) { | |
| 5358 remove_self_forwarding_pointers(); | |
| 5359 if (PrintGCDetails) { | |
|
1719
b63010841f78
6975964: G1: print out a more descriptive message for evacuation failure when +PrintGCDetails is set
tonyp
parents:
1718
diff
changeset
|
5360 gclog_or_tty->print(" (to-space overflow)"); |
| 342 | 5361 } else if (PrintGC) { |
| 5362 gclog_or_tty->print("--"); | |
| 5363 } | |
| 5364 } | |
| 5365 | |
|
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|
5366 // Enqueue any remaining references remaining on the STW |
|
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|
5367 // reference processor's discovered lists. We need to do |
|
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|
5368 // this after the card table is cleaned (and verified) as |
|
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|
5369 // the act of enqueuing entries on to the pending list |
|
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|
5370 // will log these updates (and dirty their associated |
|
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|
5371 // cards). We need these updates logged to update any |
|
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|
5372 // RSets. |
|
4dfb2df418f2
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|
5373 enqueue_discovered_references(); |
|
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|
5374 |
|
616
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diff
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|
5375 if (G1DeferredRSUpdate) { |
|
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diff
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|
5376 RedirtyLoggedCardTableEntryFastClosure redirty; |
|
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6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
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|
5377 dirty_card_queue_set().set_closure(&redirty); |
|
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6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
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|
5378 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
| 1111 | 5379 |
| 5380 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
| 5381 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
|
616
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|
5382 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
|
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|
5383 } |
| 342 | 5384 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
| 5385 } | |
| 5386 | |
| 2173 | 5387 void G1CollectedHeap::free_region_if_empty(HeapRegion* hr, |
| 2152 | 5388 size_t* pre_used, |
| 5389 FreeRegionList* free_list, | |
| 4072 | 5390 OldRegionSet* old_proxy_set, |
| 2152 | 5391 HumongousRegionSet* humongous_proxy_set, |
| 2173 | 5392 HRRSCleanupTask* hrrs_cleanup_task, |
| 2152 | 5393 bool par) { |
| 5394 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { | |
| 5395 if (hr->isHumongous()) { | |
| 5396 assert(hr->startsHumongous(), "we should only see starts humongous"); | |
| 5397 free_humongous_region(hr, pre_used, free_list, humongous_proxy_set, par); | |
| 5398 } else { | |
| 4072 | 5399 _old_set.remove_with_proxy(hr, old_proxy_set); |
| 2152 | 5400 free_region(hr, pre_used, free_list, par); |
| 342 | 5401 } |
| 2173 | 5402 } else { |
| 5403 hr->rem_set()->do_cleanup_work(hrrs_cleanup_task); | |
| 342 | 5404 } |
| 5405 } | |
| 5406 | |
| 2152 | 5407 void G1CollectedHeap::free_region(HeapRegion* hr, |
| 5408 size_t* pre_used, | |
| 5409 FreeRegionList* free_list, | |
| 5410 bool par) { | |
| 5411 assert(!hr->isHumongous(), "this is only for non-humongous regions"); | |
| 5412 assert(!hr->is_empty(), "the region should not be empty"); | |
| 5413 assert(free_list != NULL, "pre-condition"); | |
| 5414 | |
| 5415 *pre_used += hr->used(); | |
| 5416 hr->hr_clear(par, true /* clear_space */); | |
|
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|
5417 free_list->add_as_head(hr); |
| 2152 | 5418 } |
| 5419 | |
| 5420 void G1CollectedHeap::free_humongous_region(HeapRegion* hr, | |
| 5421 size_t* pre_used, | |
| 5422 FreeRegionList* free_list, | |
| 5423 HumongousRegionSet* humongous_proxy_set, | |
| 5424 bool par) { | |
| 5425 assert(hr->startsHumongous(), "this is only for starts humongous regions"); | |
| 5426 assert(free_list != NULL, "pre-condition"); | |
| 5427 assert(humongous_proxy_set != NULL, "pre-condition"); | |
| 5428 | |
| 5429 size_t hr_used = hr->used(); | |
| 5430 size_t hr_capacity = hr->capacity(); | |
| 5431 size_t hr_pre_used = 0; | |
| 5432 _humongous_set.remove_with_proxy(hr, humongous_proxy_set); | |
| 5433 hr->set_notHumongous(); | |
| 5434 free_region(hr, &hr_pre_used, free_list, par); | |
| 5435 | |
| 3766 | 5436 size_t i = hr->hrs_index() + 1; |
| 2152 | 5437 size_t num = 1; |
| 3766 | 5438 while (i < n_regions()) { |
| 5439 HeapRegion* curr_hr = region_at(i); | |
| 2152 | 5440 if (!curr_hr->continuesHumongous()) { |
| 5441 break; | |
| 5442 } | |
| 5443 curr_hr->set_notHumongous(); | |
| 5444 free_region(curr_hr, &hr_pre_used, free_list, par); | |
| 5445 num += 1; | |
| 5446 i += 1; | |
| 5447 } | |
| 5448 assert(hr_pre_used == hr_used, | |
| 5449 err_msg("hr_pre_used: "SIZE_FORMAT" and hr_used: "SIZE_FORMAT" " | |
| 5450 "should be the same", hr_pre_used, hr_used)); | |
| 5451 *pre_used += hr_pre_used; | |
| 5452 } | |
| 5453 | |
| 5454 void G1CollectedHeap::update_sets_after_freeing_regions(size_t pre_used, | |
| 5455 FreeRegionList* free_list, | |
| 4072 | 5456 OldRegionSet* old_proxy_set, |
| 2152 | 5457 HumongousRegionSet* humongous_proxy_set, |
| 5458 bool par) { | |
| 5459 if (pre_used > 0) { | |
| 5460 Mutex* lock = (par) ? ParGCRareEvent_lock : NULL; | |
| 342 | 5461 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); |
| 2152 | 5462 assert(_summary_bytes_used >= pre_used, |
| 5463 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" " | |
| 5464 "should be >= pre_used: "SIZE_FORMAT, | |
| 5465 _summary_bytes_used, pre_used)); | |
| 342 | 5466 _summary_bytes_used -= pre_used; |
| 2152 | 5467 } |
| 5468 if (free_list != NULL && !free_list->is_empty()) { | |
| 5469 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); | |
|
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|
5470 _free_list.add_as_head(free_list); |
| 2152 | 5471 } |
| 4072 | 5472 if (old_proxy_set != NULL && !old_proxy_set->is_empty()) { |
| 5473 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
| 5474 _old_set.update_from_proxy(old_proxy_set); | |
| 5475 } | |
| 2152 | 5476 if (humongous_proxy_set != NULL && !humongous_proxy_set->is_empty()) { |
| 5477 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
| 5478 _humongous_set.update_from_proxy(humongous_proxy_set); | |
| 342 | 5479 } |
| 5480 } | |
| 5481 | |
|
796
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6819065: G1: eliminate high serial card table clearing time
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|
5482 class G1ParCleanupCTTask : public AbstractGangTask { |
|
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|
5483 CardTableModRefBS* _ct_bs; |
|
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diff
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|
5484 G1CollectedHeap* _g1h; |
|
940
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936
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|
5485 HeapRegion* volatile _su_head; |
|
796
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diff
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|
5486 public: |
|
29e7d79232b9
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diff
changeset
|
5487 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
|
3830
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
diff
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|
5488 G1CollectedHeap* g1h) : |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
changeset
|
5489 AbstractGangTask("G1 Par Cleanup CT Task"), |
|
3830
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
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|
5490 _ct_bs(ct_bs), _g1h(g1h) { } |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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diff
changeset
|
5491 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5492 void work(uint worker_id) { |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
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|
5493 HeapRegion* r; |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
changeset
|
5494 while (r = _g1h->pop_dirty_cards_region()) { |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5495 clear_cards(r); |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5496 } |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
5497 } |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
5498 |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5499 void clear_cards(HeapRegion* r) { |
|
3830
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
changeset
|
5500 // 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
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1391
diff
changeset
|
5501 if (!r->is_survivor()) { |
|
796
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6819065: G1: eliminate high serial card table clearing time
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794
diff
changeset
|
5502 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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parents:
794
diff
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|
5503 } |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
changeset
|
5504 } |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
changeset
|
5505 }; |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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794
diff
changeset
|
5506 |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
5507 #ifndef PRODUCT |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5508 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
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3293
diff
changeset
|
5509 G1CollectedHeap* _g1h; |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
5510 CardTableModRefBS* _ct_bs; |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
5511 public: |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
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3293
diff
changeset
|
5512 G1VerifyCardTableCleanup(G1CollectedHeap* g1h, CardTableModRefBS* ct_bs) |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
changeset
|
5513 : _g1h(g1h), _ct_bs(ct_bs) { } |
|
2433
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7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
5514 virtual bool doHeapRegion(HeapRegion* r) { |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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1391
diff
changeset
|
5515 if (r->is_survivor()) { |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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3293
diff
changeset
|
5516 _g1h->verify_dirty_region(r); |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
5517 } else { |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
changeset
|
5518 _g1h->verify_not_dirty_region(r); |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
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|
5519 } |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
5520 return false; |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
5521 } |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
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|
5522 }; |
|
2433
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diff
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|
5523 |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
changeset
|
5524 void G1CollectedHeap::verify_not_dirty_region(HeapRegion* hr) { |
|
063382f9b575
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diff
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|
5525 // All of the region should be clean. |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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changeset
|
5526 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5527 MemRegion mr(hr->bottom(), hr->end()); |
|
063382f9b575
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changeset
|
5528 ct_bs->verify_not_dirty_region(mr); |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5529 } |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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changeset
|
5530 |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
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|
5531 void G1CollectedHeap::verify_dirty_region(HeapRegion* hr) { |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5532 // We cannot guarantee that [bottom(),end()] is dirty. Threads |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
changeset
|
5533 // dirty allocated blocks as they allocate them. The thread that |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
changeset
|
5534 // retires each region and replaces it with a new one will do a |
|
063382f9b575
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diff
changeset
|
5535 // maximal allocation to fill in [pre_dummy_top(),end()] but will |
|
063382f9b575
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|
5536 // not dirty that area (one less thing to have to do while holding |
|
063382f9b575
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changeset
|
5537 // a lock). So we can only verify that [bottom(),pre_dummy_top()] |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5538 // is dirty. |
|
063382f9b575
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changeset
|
5539 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
|
063382f9b575
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changeset
|
5540 MemRegion mr(hr->bottom(), hr->pre_dummy_top()); |
|
063382f9b575
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changeset
|
5541 ct_bs->verify_dirty_region(mr); |
|
063382f9b575
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|
5542 } |
|
063382f9b575
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|
5543 |
|
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|
5544 void G1CollectedHeap::verify_dirty_young_list(HeapRegion* head) { |
|
3317
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changeset
|
5545 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
|
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changeset
|
5546 for (HeapRegion* hr = head; hr != NULL; hr = hr->get_next_young_region()) { |
|
3317
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changeset
|
5547 verify_dirty_region(hr); |
|
2433
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2432
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|
5548 } |
|
abdfc822206f
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2432
diff
changeset
|
5549 } |
|
abdfc822206f
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|
5550 |
|
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5551 void G1CollectedHeap::verify_dirty_young_regions() { |
|
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5552 verify_dirty_young_list(_young_list->first_region()); |
|
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5553 verify_dirty_young_list(_young_list->first_survivor_region()); |
|
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5554 } |
|
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|
5555 #endif |
|
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|
5556 |
| 342 | 5557 void G1CollectedHeap::cleanUpCardTable() { |
| 5558 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
| 5559 double start = os::elapsedTime(); | |
| 5560 | |
| 4023 | 5561 { |
| 5562 // Iterate over the dirty cards region list. | |
| 5563 G1ParCleanupCTTask cleanup_task(ct_bs, this); | |
| 5564 | |
| 4711 | 5565 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 5566 set_par_threads(); | |
| 4023 | 5567 workers()->run_task(&cleanup_task); |
| 5568 set_par_threads(0); | |
| 5569 } else { | |
| 5570 while (_dirty_cards_region_list) { | |
| 5571 HeapRegion* r = _dirty_cards_region_list; | |
| 5572 cleanup_task.clear_cards(r); | |
| 5573 _dirty_cards_region_list = r->get_next_dirty_cards_region(); | |
| 5574 if (_dirty_cards_region_list == r) { | |
| 5575 // The last region. | |
| 5576 _dirty_cards_region_list = NULL; | |
| 5577 } | |
| 5578 r->set_next_dirty_cards_region(NULL); | |
|
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|
5579 } |
|
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|
5580 } |
| 4023 | 5581 #ifndef PRODUCT |
| 5582 if (G1VerifyCTCleanup || VerifyAfterGC) { | |
| 5583 G1VerifyCardTableCleanup cleanup_verifier(this, ct_bs); | |
| 5584 heap_region_iterate(&cleanup_verifier); | |
| 5585 } | |
| 5586 #endif | |
|
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5587 } |
|
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5588 |
| 342 | 5589 double elapsed = os::elapsedTime() - start; |
|
3979
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|
5590 g1_policy()->record_clear_ct_time(elapsed * 1000.0); |
| 342 | 5591 } |
| 5592 | |
| 5593 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
| 2152 | 5594 size_t pre_used = 0; |
| 5595 FreeRegionList local_free_list("Local List for CSet Freeing"); | |
| 5596 | |
| 342 | 5597 double young_time_ms = 0.0; |
| 5598 double non_young_time_ms = 0.0; | |
| 5599 | |
|
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|
5600 // Since the collection set is a superset of the the young list, |
|
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|
5601 // all we need to do to clear the young list is clear its |
|
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|
5602 // head and length, and unlink any young regions in the code below |
|
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|
5603 _young_list->clear(); |
|
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|
5604 |
| 342 | 5605 G1CollectorPolicy* policy = g1_policy(); |
| 5606 | |
| 5607 double start_sec = os::elapsedTime(); | |
| 5608 bool non_young = true; | |
| 5609 | |
| 5610 HeapRegion* cur = cs_head; | |
| 5611 int age_bound = -1; | |
| 5612 size_t rs_lengths = 0; | |
| 5613 | |
| 5614 while (cur != NULL) { | |
| 2361 | 5615 assert(!is_on_master_free_list(cur), "sanity"); |
| 342 | 5616 if (non_young) { |
| 5617 if (cur->is_young()) { | |
| 5618 double end_sec = os::elapsedTime(); | |
| 5619 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 5620 non_young_time_ms += elapsed_ms; | |
| 5621 | |
| 5622 start_sec = os::elapsedTime(); | |
| 5623 non_young = false; | |
| 5624 } | |
| 5625 } else { | |
|
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|
5626 if (!cur->is_young()) { |
|
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|
5627 double end_sec = os::elapsedTime(); |
|
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|
5628 double elapsed_ms = (end_sec - start_sec) * 1000.0; |
|
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|
5629 young_time_ms += elapsed_ms; |
|
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|
5630 |
|
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|
5631 start_sec = os::elapsedTime(); |
|
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|
5632 non_young = true; |
|
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|
5633 } |
| 342 | 5634 } |
| 5635 | |
| 5636 rs_lengths += cur->rem_set()->occupied(); | |
| 5637 | |
| 5638 HeapRegion* next = cur->next_in_collection_set(); | |
| 5639 assert(cur->in_collection_set(), "bad CS"); | |
| 5640 cur->set_next_in_collection_set(NULL); | |
| 5641 cur->set_in_collection_set(false); | |
| 5642 | |
| 5643 if (cur->is_young()) { | |
| 5644 int index = cur->young_index_in_cset(); | |
|
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|
5645 assert(index != -1, "invariant"); |
|
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|
5646 assert((size_t) index < policy->young_cset_region_length(), "invariant"); |
| 342 | 5647 size_t words_survived = _surviving_young_words[index]; |
| 5648 cur->record_surv_words_in_group(words_survived); | |
|
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|
5649 |
|
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|
5650 // At this point the we have 'popped' cur from the collection set |
|
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|
5651 // (linked via next_in_collection_set()) but it is still in the |
|
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|
5652 // young list (linked via next_young_region()). Clear the |
|
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|
5653 // _next_young_region field. |
|
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|
5654 cur->set_next_young_region(NULL); |
| 342 | 5655 } else { |
| 5656 int index = cur->young_index_in_cset(); | |
|
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|
5657 assert(index == -1, "invariant"); |
| 342 | 5658 } |
| 5659 | |
| 5660 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
| 5661 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
| 5662 "invariant" ); | |
| 5663 | |
| 5664 if (!cur->evacuation_failed()) { | |
|
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|
5665 MemRegion used_mr = cur->used_region(); |
|
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|
5666 |
| 342 | 5667 // And the region is empty. |
|
4097
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|
5668 assert(!used_mr.is_empty(), "Should not have empty regions in a CS."); |
|
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|
5669 |
|
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|
5670 // If marking is in progress then clear any objects marked in |
|
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|
5671 // the current region. Note mark_in_progress() returns false, |
|
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|
5672 // even during an initial mark pause, until the set_marking_started() |
|
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|
5673 // call which takes place later in the pause. |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5674 if (mark_in_progress()) { |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5675 assert(!g1_policy()->during_initial_mark_pause(), "sanity"); |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5676 _cm->nextMarkBitMap()->clearRange(used_mr); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5677 } |
|
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|
5678 |
| 2152 | 5679 free_region(cur, &pre_used, &local_free_list, false /* par */); |
| 342 | 5680 } else { |
| 5681 cur->uninstall_surv_rate_group(); | |
|
4090
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|
5682 if (cur->is_young()) { |
| 342 | 5683 cur->set_young_index_in_cset(-1); |
|
4090
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|
5684 } |
| 342 | 5685 cur->set_not_young(); |
| 5686 cur->set_evacuation_failed(false); | |
| 4072 | 5687 // The region is now considered to be old. |
| 5688 _old_set.add(cur); | |
| 342 | 5689 } |
| 5690 cur = next; | |
| 5691 } | |
| 5692 | |
| 5693 policy->record_max_rs_lengths(rs_lengths); | |
| 5694 policy->cset_regions_freed(); | |
| 5695 | |
| 5696 double end_sec = os::elapsedTime(); | |
| 5697 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
|
4097
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|
5698 |
|
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|
5699 if (non_young) { |
| 342 | 5700 non_young_time_ms += elapsed_ms; |
|
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|
5701 } else { |
| 342 | 5702 young_time_ms += elapsed_ms; |
|
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|
5703 } |
| 342 | 5704 |
| 2152 | 5705 update_sets_after_freeing_regions(pre_used, &local_free_list, |
| 4072 | 5706 NULL /* old_proxy_set */, |
| 2152 | 5707 NULL /* humongous_proxy_set */, |
| 5708 false /* par */); | |
| 342 | 5709 policy->record_young_free_cset_time_ms(young_time_ms); |
| 5710 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
| 5711 } | |
| 5712 | |
|
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|
5713 // This routine is similar to the above but does not record |
|
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|
5714 // any policy statistics or update free lists; we are abandoning |
|
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|
5715 // the current incremental collection set in preparation of a |
|
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|
5716 // full collection. After the full GC we will start to build up |
|
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|
5717 // the incremental collection set again. |
|
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|
5718 // This is only called when we're doing a full collection |
|
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|
5719 // and is immediately followed by the tearing down of the young list. |
|
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|
5720 |
|
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|
5721 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
|
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|
5722 HeapRegion* cur = cs_head; |
|
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|
5723 |
|
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|
5724 while (cur != NULL) { |
|
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diff
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|
5725 HeapRegion* next = cur->next_in_collection_set(); |
|
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|
5726 assert(cur->in_collection_set(), "bad CS"); |
|
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|
5727 cur->set_next_in_collection_set(NULL); |
|
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|
5728 cur->set_in_collection_set(false); |
|
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|
5729 cur->set_young_index_in_cset(-1); |
|
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|
5730 cur = next; |
|
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|
5731 } |
|
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|
5732 } |
|
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|
5733 |
| 2152 | 5734 void G1CollectedHeap::set_free_regions_coming() { |
| 5735 if (G1ConcRegionFreeingVerbose) { | |
| 5736 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
| 5737 "setting free regions coming"); | |
| 5738 } | |
| 5739 | |
| 5740 assert(!free_regions_coming(), "pre-condition"); | |
| 5741 _free_regions_coming = true; | |
| 342 | 5742 } |
| 5743 | |
| 2152 | 5744 void G1CollectedHeap::reset_free_regions_coming() { |
| 5745 { | |
| 5746 assert(free_regions_coming(), "pre-condition"); | |
| 5747 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 5748 _free_regions_coming = false; | |
| 5749 SecondaryFreeList_lock->notify_all(); | |
| 5750 } | |
| 5751 | |
| 5752 if (G1ConcRegionFreeingVerbose) { | |
| 5753 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
| 5754 "reset free regions coming"); | |
| 342 | 5755 } |
| 5756 } | |
| 5757 | |
| 2152 | 5758 void G1CollectedHeap::wait_while_free_regions_coming() { |
| 5759 // Most of the time we won't have to wait, so let's do a quick test | |
| 5760 // first before we take the lock. | |
| 5761 if (!free_regions_coming()) { | |
| 5762 return; | |
| 5763 } | |
| 5764 | |
| 5765 if (G1ConcRegionFreeingVerbose) { | |
| 5766 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
| 5767 "waiting for free regions"); | |
| 342 | 5768 } |
| 5769 | |
| 5770 { | |
| 2152 | 5771 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
| 5772 while (free_regions_coming()) { | |
| 5773 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 342 | 5774 } |
| 2152 | 5775 } |
| 5776 | |
| 5777 if (G1ConcRegionFreeingVerbose) { | |
| 5778 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
| 5779 "done waiting for free regions"); | |
| 5780 } | |
| 342 | 5781 } |
| 5782 | |
| 5783 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
| 5784 assert(heap_lock_held_for_gc(), | |
| 5785 "the heap lock should already be held by or for this thread"); | |
| 5786 _young_list->push_region(hr); | |
| 5787 } | |
| 5788 | |
| 5789 class NoYoungRegionsClosure: public HeapRegionClosure { | |
| 5790 private: | |
| 5791 bool _success; | |
| 5792 public: | |
| 5793 NoYoungRegionsClosure() : _success(true) { } | |
| 5794 bool doHeapRegion(HeapRegion* r) { | |
| 5795 if (r->is_young()) { | |
| 5796 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
| 5797 r->bottom(), r->end()); | |
| 5798 _success = false; | |
| 5799 } | |
| 5800 return false; | |
| 5801 } | |
| 5802 bool success() { return _success; } | |
| 5803 }; | |
| 5804 | |
|
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changeset
|
5805 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5806 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
|
5807 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
5808 if (check_heap) { |
| 342 | 5809 NoYoungRegionsClosure closure; |
| 5810 heap_region_iterate(&closure); | |
| 5811 ret = ret && closure.success(); | |
| 5812 } | |
| 5813 | |
| 5814 return ret; | |
| 5815 } | |
| 5816 | |
| 4072 | 5817 class TearDownRegionSetsClosure : public HeapRegionClosure { |
| 5818 private: | |
| 5819 OldRegionSet *_old_set; | |
| 2152 | 5820 |
| 342 | 5821 public: |
| 4072 | 5822 TearDownRegionSetsClosure(OldRegionSet* old_set) : _old_set(old_set) { } |
| 2152 | 5823 |
| 342 | 5824 bool doHeapRegion(HeapRegion* r) { |
| 4072 | 5825 if (r->is_empty()) { |
| 5826 // We ignore empty regions, we'll empty the free list afterwards | |
| 5827 } else if (r->is_young()) { | |
| 5828 // We ignore young regions, we'll empty the young list afterwards | |
| 5829 } else if (r->isHumongous()) { | |
| 5830 // We ignore humongous regions, we're not tearing down the | |
| 5831 // humongous region set | |
| 342 | 5832 } else { |
| 4072 | 5833 // The rest should be old |
| 5834 _old_set->remove(r); | |
| 342 | 5835 } |
| 5836 return false; | |
| 5837 } | |
| 5838 | |
| 4072 | 5839 ~TearDownRegionSetsClosure() { |
| 5840 assert(_old_set->is_empty(), "post-condition"); | |
| 2152 | 5841 } |
| 342 | 5842 }; |
| 5843 | |
| 4072 | 5844 void G1CollectedHeap::tear_down_region_sets(bool free_list_only) { |
| 5845 assert_at_safepoint(true /* should_be_vm_thread */); | |
| 5846 | |
| 5847 if (!free_list_only) { | |
| 5848 TearDownRegionSetsClosure cl(&_old_set); | |
| 5849 heap_region_iterate(&cl); | |
| 5850 | |
| 5851 // Need to do this after the heap iteration to be able to | |
| 5852 // recognize the young regions and ignore them during the iteration. | |
| 5853 _young_list->empty_list(); | |
| 5854 } | |
| 5855 _free_list.remove_all(); | |
| 5856 } | |
| 5857 | |
| 5858 class RebuildRegionSetsClosure : public HeapRegionClosure { | |
| 5859 private: | |
| 5860 bool _free_list_only; | |
| 5861 OldRegionSet* _old_set; | |
| 5862 FreeRegionList* _free_list; | |
| 5863 size_t _total_used; | |
| 5864 | |
| 5865 public: | |
| 5866 RebuildRegionSetsClosure(bool free_list_only, | |
| 5867 OldRegionSet* old_set, FreeRegionList* free_list) : | |
| 5868 _free_list_only(free_list_only), | |
| 5869 _old_set(old_set), _free_list(free_list), _total_used(0) { | |
| 5870 assert(_free_list->is_empty(), "pre-condition"); | |
| 5871 if (!free_list_only) { | |
| 5872 assert(_old_set->is_empty(), "pre-condition"); | |
| 5873 } | |
| 5874 } | |
| 5875 | |
| 5876 bool doHeapRegion(HeapRegion* r) { | |
| 5877 if (r->continuesHumongous()) { | |
| 5878 return false; | |
| 5879 } | |
| 5880 | |
| 5881 if (r->is_empty()) { | |
| 5882 // Add free regions to the free list | |
| 5883 _free_list->add_as_tail(r); | |
| 5884 } else if (!_free_list_only) { | |
| 5885 assert(!r->is_young(), "we should not come across young regions"); | |
| 5886 | |
| 5887 if (r->isHumongous()) { | |
| 5888 // We ignore humongous regions, we left the humongous set unchanged | |
| 5889 } else { | |
| 5890 // The rest should be old, add them to the old set | |
| 5891 _old_set->add(r); | |
| 5892 } | |
| 5893 _total_used += r->used(); | |
| 5894 } | |
| 5895 | |
| 5896 return false; | |
| 5897 } | |
| 5898 | |
| 5899 size_t total_used() { | |
| 5900 return _total_used; | |
| 5901 } | |
| 5902 }; | |
| 5903 | |
| 5904 void G1CollectedHeap::rebuild_region_sets(bool free_list_only) { | |
| 5905 assert_at_safepoint(true /* should_be_vm_thread */); | |
| 5906 | |
| 5907 RebuildRegionSetsClosure cl(free_list_only, &_old_set, &_free_list); | |
| 5908 heap_region_iterate(&cl); | |
| 5909 | |
| 5910 if (!free_list_only) { | |
| 5911 _summary_bytes_used = cl.total_used(); | |
| 5912 } | |
| 5913 assert(_summary_bytes_used == recalculate_used(), | |
| 5914 err_msg("inconsistent _summary_bytes_used, " | |
| 5915 "value: "SIZE_FORMAT" recalculated: "SIZE_FORMAT, | |
| 5916 _summary_bytes_used, recalculate_used())); | |
| 342 | 5917 } |
| 5918 | |
| 5919 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
| 5920 _refine_cte_cl->set_concurrent(concurrent); | |
| 5921 } | |
| 5922 | |
| 5923 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
| 5924 HeapRegion* hr = heap_region_containing(p); | |
| 5925 if (hr == NULL) { | |
| 5926 return is_in_permanent(p); | |
| 5927 } else { | |
| 5928 return hr->is_in(p); | |
| 5929 } | |
| 5930 } | |
| 2152 | 5931 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5932 // 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
|
5933 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5934 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
|
5935 bool force) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5936 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
|
5937 assert(!force || g1_policy()->can_expand_young_list(), |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5938 "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
|
5939 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
|
5940 if (force || !young_list_full) { |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5941 HeapRegion* new_alloc_region = new_region(word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5942 false /* do_expand */); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5943 if (new_alloc_region != NULL) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5944 set_region_short_lived_locked(new_alloc_region); |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
5945 _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
|
5946 return new_alloc_region; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5947 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5948 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5949 return NULL; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5950 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5951 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5952 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
|
5953 size_t allocated_bytes) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5954 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
|
5955 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
|
5956 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5957 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
|
5958 _summary_bytes_used += allocated_bytes; |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
5959 _hr_printer.retire(alloc_region); |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
5960 // 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
|
5961 // 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
|
5962 // used space has been recored in _summary_bytes_used. |
|
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
5963 g1mm()->update_eden_size(); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5964 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5965 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5966 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
|
5967 bool force) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5968 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
|
5969 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5970 |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5971 void G1CollectedHeap::set_par_threads() { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5972 // 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
|
5973 // in the workgroup. |
| 4711 | 5974 assert(G1CollectedHeap::use_parallel_gc_threads(), "shouldn't be here otherwise"); |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5975 uint n_workers = workers()->active_workers(); |
| 4711 | 5976 assert(UseDynamicNumberOfGCThreads || |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5977 n_workers == workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5978 "Otherwise should be using the total number of workers"); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5979 if (n_workers == 0) { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5980 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
|
5981 n_workers = ParallelGCThreads; |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5982 workers()->set_active_workers(n_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5983 } |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5984 set_par_threads(n_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5985 } |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5986 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5987 void MutatorAllocRegion::retire_region(HeapRegion* alloc_region, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5988 size_t allocated_bytes) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5989 _g1h->retire_mutator_alloc_region(alloc_region, allocated_bytes); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5990 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5991 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5992 // Methods for the GC alloc regions |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5993 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5994 HeapRegion* G1CollectedHeap::new_gc_alloc_region(size_t word_size, |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5995 size_t count, |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5996 GCAllocPurpose ap) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5997 assert(FreeList_lock->owned_by_self(), "pre-condition"); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5998 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5999 if (count < g1_policy()->max_regions(ap)) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6000 HeapRegion* new_alloc_region = new_region(word_size, |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6001 true /* do_expand */); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6002 if (new_alloc_region != NULL) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6003 // We really only need to do this for old regions given that we |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6004 // should never scan survivors. But it doesn't hurt to do it |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6005 // for survivors too. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6006 new_alloc_region->set_saved_mark(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6007 if (ap == GCAllocForSurvived) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6008 new_alloc_region->set_survivor(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6009 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Survivor); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6010 } else { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6011 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Old); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6012 } |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
6013 bool during_im = g1_policy()->during_initial_mark_pause(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
6014 new_alloc_region->note_start_of_copying(during_im); |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6015 return new_alloc_region; |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6016 } else { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6017 g1_policy()->note_alloc_region_limit_reached(ap); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6018 } |
|
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6019 } |
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6020 return NULL; |
|
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6021 } |
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6022 |
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6023 void G1CollectedHeap::retire_gc_alloc_region(HeapRegion* alloc_region, |
|
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6024 size_t allocated_bytes, |
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6025 GCAllocPurpose ap) { |
|
4787
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6026 bool during_im = g1_policy()->during_initial_mark_pause(); |
|
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6027 alloc_region->note_end_of_copying(during_im); |
|
3830
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6028 g1_policy()->record_bytes_copied_during_gc(allocated_bytes); |
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6029 if (ap == GCAllocForSurvived) { |
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6030 young_list()->add_survivor_region(alloc_region); |
| 4072 | 6031 } else { |
| 6032 _old_set.add(alloc_region); | |
|
3830
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6033 } |
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6034 _hr_printer.retire(alloc_region); |
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6035 } |
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6036 |
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6037 HeapRegion* SurvivorGCAllocRegion::allocate_new_region(size_t word_size, |
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6038 bool force) { |
|
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6039 assert(!force, "not supported for GC alloc regions"); |
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6040 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForSurvived); |
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6041 } |
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6042 |
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6043 void SurvivorGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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6044 size_t allocated_bytes) { |
|
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6045 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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6046 GCAllocForSurvived); |
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6047 } |
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6048 |
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6049 HeapRegion* OldGCAllocRegion::allocate_new_region(size_t word_size, |
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6050 bool force) { |
|
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6051 assert(!force, "not supported for GC alloc regions"); |
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6052 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForTenured); |
|
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|
6053 } |
|
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6054 |
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6055 void OldGCAllocRegion::retire_region(HeapRegion* alloc_region, |
|
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6056 size_t allocated_bytes) { |
|
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6057 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
|
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|
6058 GCAllocForTenured); |
|
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|
6059 } |
|
2433
abdfc822206f
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|
6060 // Heap region set verification |
|
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|
6061 |
| 2152 | 6062 class VerifyRegionListsClosure : public HeapRegionClosure { |
| 6063 private: | |
| 4072 | 6064 FreeRegionList* _free_list; |
| 6065 OldRegionSet* _old_set; | |
| 2152 | 6066 HumongousRegionSet* _humongous_set; |
| 6067 size_t _region_count; | |
| 6068 | |
| 6069 public: | |
| 4072 | 6070 VerifyRegionListsClosure(OldRegionSet* old_set, |
| 6071 HumongousRegionSet* humongous_set, | |
| 2152 | 6072 FreeRegionList* free_list) : |
| 4072 | 6073 _old_set(old_set), _humongous_set(humongous_set), |
| 6074 _free_list(free_list), _region_count(0) { } | |
| 2152 | 6075 |
| 6076 size_t region_count() { return _region_count; } | |
| 6077 | |
| 6078 bool doHeapRegion(HeapRegion* hr) { | |
| 6079 _region_count += 1; | |
| 6080 | |
| 6081 if (hr->continuesHumongous()) { | |
| 6082 return false; | |
| 6083 } | |
| 6084 | |
| 6085 if (hr->is_young()) { | |
| 6086 // TODO | |
| 6087 } else if (hr->startsHumongous()) { | |
| 6088 _humongous_set->verify_next_region(hr); | |
| 6089 } else if (hr->is_empty()) { | |
| 6090 _free_list->verify_next_region(hr); | |
| 4072 | 6091 } else { |
| 6092 _old_set->verify_next_region(hr); | |
| 2152 | 6093 } |
| 6094 return false; | |
| 6095 } | |
| 6096 }; | |
| 6097 | |
| 3766 | 6098 HeapRegion* G1CollectedHeap::new_heap_region(size_t hrs_index, |
| 6099 HeapWord* bottom) { | |
| 6100 HeapWord* end = bottom + HeapRegion::GrainWords; | |
| 6101 MemRegion mr(bottom, end); | |
| 6102 assert(_g1_reserved.contains(mr), "invariant"); | |
| 6103 // This might return NULL if the allocation fails | |
| 6104 return new HeapRegion(hrs_index, _bot_shared, mr, true /* is_zeroed */); | |
| 6105 } | |
| 6106 | |
| 2152 | 6107 void G1CollectedHeap::verify_region_sets() { |
| 6108 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); | |
| 6109 | |
| 6110 // First, check the explicit lists. | |
| 6111 _free_list.verify(); | |
| 6112 { | |
| 6113 // Given that a concurrent operation might be adding regions to | |
| 6114 // the secondary free list we have to take the lock before | |
| 6115 // verifying it. | |
| 6116 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 6117 _secondary_free_list.verify(); | |
| 6118 } | |
| 4072 | 6119 _old_set.verify(); |
| 2152 | 6120 _humongous_set.verify(); |
| 6121 | |
| 6122 // If a concurrent region freeing operation is in progress it will | |
| 6123 // be difficult to correctly attributed any free regions we come | |
| 6124 // across to the correct free list given that they might belong to | |
| 6125 // one of several (free_list, secondary_free_list, any local lists, | |
| 6126 // etc.). So, if that's the case we will skip the rest of the | |
| 6127 // verification operation. Alternatively, waiting for the concurrent | |
| 6128 // operation to complete will have a non-trivial effect on the GC's | |
| 6129 // operation (no concurrent operation will last longer than the | |
| 6130 // interval between two calls to verification) and it might hide | |
| 6131 // any issues that we would like to catch during testing. | |
| 6132 if (free_regions_coming()) { | |
| 6133 return; | |
| 6134 } | |
| 6135 | |
| 2361 | 6136 // Make sure we append the secondary_free_list on the free_list so |
| 6137 // that all free regions we will come across can be safely | |
| 6138 // attributed to the free_list. | |
| 6139 append_secondary_free_list_if_not_empty_with_lock(); | |
| 2152 | 6140 |
| 6141 // Finally, make sure that the region accounting in the lists is | |
| 6142 // consistent with what we see in the heap. | |
| 4072 | 6143 _old_set.verify_start(); |
| 2152 | 6144 _humongous_set.verify_start(); |
| 6145 _free_list.verify_start(); | |
| 6146 | |
| 4072 | 6147 VerifyRegionListsClosure cl(&_old_set, &_humongous_set, &_free_list); |
| 2152 | 6148 heap_region_iterate(&cl); |
| 6149 | |
| 4072 | 6150 _old_set.verify_end(); |
| 2152 | 6151 _humongous_set.verify_end(); |
| 6152 _free_list.verify_end(); | |
| 342 | 6153 } |