Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 5987:748051fd24ce
7130974: G1: Remove G1ParCopyHelper
Reviewed-by: tonyp, johnc
| author | brutisso |
|---|---|
| date | Fri, 16 Mar 2012 09:52:57 +0100 |
| parents | 500023bd0818 |
| children | 5c86f8211d1e |
| 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 |
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177 YoungList::YoungList(G1CollectedHeap* g1h) : |
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178 _g1h(g1h), _head(NULL), _length(0), _last_sampled_rs_lengths(0), |
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179 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) { |
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180 guarantee(check_list_empty(false), "just making sure..."); |
| 342 | 181 } |
| 182 | |
| 183 void YoungList::push_region(HeapRegion *hr) { | |
| 184 assert(!hr->is_young(), "should not already be young"); | |
| 185 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
| 186 | |
| 187 hr->set_next_young_region(_head); | |
| 188 _head = hr; | |
| 189 | |
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190 _g1h->g1_policy()->set_region_eden(hr, (int) _length); |
| 342 | 191 ++_length; |
| 192 } | |
| 193 | |
| 194 void YoungList::add_survivor_region(HeapRegion* hr) { | |
| 545 | 195 assert(hr->is_survivor(), "should be flagged as survivor region"); |
| 342 | 196 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
| 197 | |
| 198 hr->set_next_young_region(_survivor_head); | |
| 199 if (_survivor_head == NULL) { | |
| 545 | 200 _survivor_tail = hr; |
| 342 | 201 } |
| 202 _survivor_head = hr; | |
| 203 ++_survivor_length; | |
| 204 } | |
| 205 | |
| 206 void YoungList::empty_list(HeapRegion* list) { | |
| 207 while (list != NULL) { | |
| 208 HeapRegion* next = list->get_next_young_region(); | |
| 209 list->set_next_young_region(NULL); | |
| 210 list->uninstall_surv_rate_group(); | |
| 211 list->set_not_young(); | |
| 212 list = next; | |
| 213 } | |
| 214 } | |
| 215 | |
| 216 void YoungList::empty_list() { | |
| 217 assert(check_list_well_formed(), "young list should be well formed"); | |
| 218 | |
| 219 empty_list(_head); | |
| 220 _head = NULL; | |
| 221 _length = 0; | |
| 222 | |
| 223 empty_list(_survivor_head); | |
| 224 _survivor_head = NULL; | |
| 545 | 225 _survivor_tail = NULL; |
| 342 | 226 _survivor_length = 0; |
| 227 | |
| 228 _last_sampled_rs_lengths = 0; | |
| 229 | |
| 230 assert(check_list_empty(false), "just making sure..."); | |
| 231 } | |
| 232 | |
| 233 bool YoungList::check_list_well_formed() { | |
| 234 bool ret = true; | |
| 235 | |
| 236 size_t length = 0; | |
| 237 HeapRegion* curr = _head; | |
| 238 HeapRegion* last = NULL; | |
| 239 while (curr != NULL) { | |
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240 if (!curr->is_young()) { |
| 342 | 241 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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242 "incorrectly tagged (y: %d, surv: %d)", |
| 342 | 243 curr->bottom(), curr->end(), |
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244 curr->is_young(), curr->is_survivor()); |
| 342 | 245 ret = false; |
| 246 } | |
| 247 ++length; | |
| 248 last = curr; | |
| 249 curr = curr->get_next_young_region(); | |
| 250 } | |
| 251 ret = ret && (length == _length); | |
| 252 | |
| 253 if (!ret) { | |
| 254 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
| 255 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
| 256 length, _length); | |
| 257 } | |
| 258 | |
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259 return ret; |
| 342 | 260 } |
| 261 | |
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262 bool YoungList::check_list_empty(bool check_sample) { |
| 342 | 263 bool ret = true; |
| 264 | |
| 265 if (_length != 0) { | |
| 266 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
| 267 _length); | |
| 268 ret = false; | |
| 269 } | |
| 270 if (check_sample && _last_sampled_rs_lengths != 0) { | |
| 271 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
| 272 ret = false; | |
| 273 } | |
| 274 if (_head != NULL) { | |
| 275 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
| 276 ret = false; | |
| 277 } | |
| 278 if (!ret) { | |
| 279 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
| 280 } | |
| 281 | |
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282 return ret; |
| 342 | 283 } |
| 284 | |
| 285 void | |
| 286 YoungList::rs_length_sampling_init() { | |
| 287 _sampled_rs_lengths = 0; | |
| 288 _curr = _head; | |
| 289 } | |
| 290 | |
| 291 bool | |
| 292 YoungList::rs_length_sampling_more() { | |
| 293 return _curr != NULL; | |
| 294 } | |
| 295 | |
| 296 void | |
| 297 YoungList::rs_length_sampling_next() { | |
| 298 assert( _curr != NULL, "invariant" ); | |
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299 size_t rs_length = _curr->rem_set()->occupied(); |
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300 |
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301 _sampled_rs_lengths += rs_length; |
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302 |
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303 // The current region may not yet have been added to the |
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304 // incremental collection set (it gets added when it is |
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305 // retired as the current allocation region). |
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306 if (_curr->in_collection_set()) { |
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307 // Update the collection set policy information for this region |
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308 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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309 } |
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310 |
| 342 | 311 _curr = _curr->get_next_young_region(); |
| 312 if (_curr == NULL) { | |
| 313 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
| 314 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
| 315 } | |
| 316 } | |
| 317 | |
| 318 void | |
| 319 YoungList::reset_auxilary_lists() { | |
| 320 guarantee( is_empty(), "young list should be empty" ); | |
| 321 assert(check_list_well_formed(), "young list should be well formed"); | |
| 322 | |
| 323 // Add survivor regions to SurvRateGroup. | |
| 324 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
| 545 | 325 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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326 |
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327 int young_index_in_cset = 0; |
| 342 | 328 for (HeapRegion* curr = _survivor_head; |
| 329 curr != NULL; | |
| 330 curr = curr->get_next_young_region()) { | |
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331 _g1h->g1_policy()->set_region_survivor(curr, young_index_in_cset); |
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332 |
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333 // The region is a non-empty survivor so let's add it to |
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334 // the incremental collection set for the next evacuation |
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335 // pause. |
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336 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
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337 young_index_in_cset += 1; |
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338 } |
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339 assert((size_t) young_index_in_cset == _survivor_length, |
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340 "post-condition"); |
| 342 | 341 _g1h->g1_policy()->note_stop_adding_survivor_regions(); |
| 342 | |
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343 _head = _survivor_head; |
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344 _length = _survivor_length; |
| 342 | 345 if (_survivor_head != NULL) { |
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346 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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347 assert(_survivor_length > 0, "invariant"); |
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348 _survivor_tail->set_next_young_region(NULL); |
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349 } |
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350 |
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351 // Don't clear the survivor list handles until the start of |
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352 // the next evacuation pause - we need it in order to re-tag |
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353 // the survivor regions from this evacuation pause as 'young' |
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354 // at the start of the next. |
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355 |
| 545 | 356 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
| 342 | 357 |
| 358 assert(check_list_well_formed(), "young list should be well formed"); | |
| 359 } | |
| 360 | |
| 361 void YoungList::print() { | |
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362 HeapRegion* lists[] = {_head, _survivor_head}; |
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363 const char* names[] = {"YOUNG", "SURVIVOR"}; |
| 342 | 364 |
| 365 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
| 366 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
| 367 HeapRegion *curr = lists[list]; | |
| 368 if (curr == NULL) | |
| 369 gclog_or_tty->print_cr(" empty"); | |
| 370 while (curr != NULL) { | |
| 371 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
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372 "age: %4d, y: %d, surv: %d", |
| 342 | 373 curr->bottom(), curr->end(), |
| 374 curr->top(), | |
| 375 curr->prev_top_at_mark_start(), | |
| 376 curr->next_top_at_mark_start(), | |
| 377 curr->top_at_conc_mark_count(), | |
| 378 curr->age_in_surv_rate_group_cond(), | |
| 379 curr->is_young(), | |
| 380 curr->is_survivor()); | |
| 381 curr = curr->get_next_young_region(); | |
| 382 } | |
| 383 } | |
| 384 | |
| 385 gclog_or_tty->print_cr(""); | |
| 386 } | |
| 387 | |
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388 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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389 { |
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390 // Claim the right to put the region on the dirty cards region list |
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391 // by installing a self pointer. |
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392 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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393 if (next == NULL) { |
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394 HeapRegion* res = (HeapRegion*) |
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395 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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396 NULL); |
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397 if (res == NULL) { |
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398 HeapRegion* head; |
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399 do { |
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400 // Put the region to the dirty cards region list. |
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401 head = _dirty_cards_region_list; |
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402 next = (HeapRegion*) |
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403 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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404 if (next == head) { |
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405 assert(hr->get_next_dirty_cards_region() == hr, |
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406 "hr->get_next_dirty_cards_region() != hr"); |
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407 if (next == NULL) { |
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408 // The last region in the list points to itself. |
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409 hr->set_next_dirty_cards_region(hr); |
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410 } else { |
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411 hr->set_next_dirty_cards_region(next); |
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412 } |
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413 } |
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414 } while (next != head); |
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415 } |
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416 } |
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417 } |
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418 |
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419 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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420 { |
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421 HeapRegion* head; |
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422 HeapRegion* hr; |
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423 do { |
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424 head = _dirty_cards_region_list; |
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425 if (head == NULL) { |
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426 return NULL; |
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427 } |
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428 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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429 if (head == new_head) { |
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430 // The last region. |
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431 new_head = NULL; |
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432 } |
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433 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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434 head); |
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435 } while (hr != head); |
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436 assert(hr != NULL, "invariant"); |
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437 hr->set_next_dirty_cards_region(NULL); |
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438 return hr; |
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439 } |
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440 |
| 342 | 441 void G1CollectedHeap::stop_conc_gc_threads() { |
| 794 | 442 _cg1r->stop(); |
| 342 | 443 _cmThread->stop(); |
| 444 } | |
| 445 | |
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446 #ifdef ASSERT |
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447 // A region is added to the collection set as it is retired |
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448 // so an address p can point to a region which will be in the |
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449 // collection set but has not yet been retired. This method |
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450 // therefore is only accurate during a GC pause after all |
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451 // regions have been retired. It is used for debugging |
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452 // to check if an nmethod has references to objects that can |
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453 // be move during a partial collection. Though it can be |
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454 // inaccurate, it is sufficient for G1 because the conservative |
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455 // implementation of is_scavengable() for G1 will indicate that |
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456 // all nmethods must be scanned during a partial collection. |
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457 bool G1CollectedHeap::is_in_partial_collection(const void* p) { |
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458 HeapRegion* hr = heap_region_containing(p); |
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459 return hr != NULL && hr->in_collection_set(); |
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460 } |
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461 #endif |
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462 |
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463 // Returns true if the reference points to an object that |
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464 // can move in an incremental collecction. |
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465 bool G1CollectedHeap::is_scavengable(const void* p) { |
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466 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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467 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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468 HeapRegion* hr = heap_region_containing(p); |
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469 if (hr == NULL) { |
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470 // perm gen (or null) |
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471 return false; |
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472 } else { |
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473 return !hr->isHumongous(); |
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474 } |
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475 } |
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476 |
| 342 | 477 void G1CollectedHeap::check_ct_logs_at_safepoint() { |
| 478 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 479 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
| 480 | |
| 481 // Count the dirty cards at the start. | |
| 482 CountNonCleanMemRegionClosure count1(this); | |
| 483 ct_bs->mod_card_iterate(&count1); | |
| 484 int orig_count = count1.n(); | |
| 485 | |
| 486 // First clear the logged cards. | |
| 487 ClearLoggedCardTableEntryClosure clear; | |
| 488 dcqs.set_closure(&clear); | |
| 489 dcqs.apply_closure_to_all_completed_buffers(); | |
| 490 dcqs.iterate_closure_all_threads(false); | |
| 491 clear.print_histo(); | |
| 492 | |
| 493 // Now ensure that there's no dirty cards. | |
| 494 CountNonCleanMemRegionClosure count2(this); | |
| 495 ct_bs->mod_card_iterate(&count2); | |
| 496 if (count2.n() != 0) { | |
| 497 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
| 498 count2.n(), orig_count); | |
| 499 } | |
| 500 guarantee(count2.n() == 0, "Card table should be clean."); | |
| 501 | |
| 502 RedirtyLoggedCardTableEntryClosure redirty; | |
| 503 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
| 504 dcqs.apply_closure_to_all_completed_buffers(); | |
| 505 dcqs.iterate_closure_all_threads(false); | |
| 506 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
| 507 clear.calls(), orig_count); | |
| 508 guarantee(redirty.calls() == clear.calls(), | |
| 509 "Or else mechanism is broken."); | |
| 510 | |
| 511 CountNonCleanMemRegionClosure count3(this); | |
| 512 ct_bs->mod_card_iterate(&count3); | |
| 513 if (count3.n() != orig_count) { | |
| 514 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
| 515 orig_count, count3.n()); | |
| 516 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
| 517 } | |
| 518 | |
| 519 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 520 } | |
| 521 | |
| 522 // Private class members. | |
| 523 | |
| 524 G1CollectedHeap* G1CollectedHeap::_g1h; | |
| 525 | |
| 526 // Private methods. | |
| 527 | |
| 2152 | 528 HeapRegion* |
| 2361 | 529 G1CollectedHeap::new_region_try_secondary_free_list() { |
| 2152 | 530 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
| 531 while (!_secondary_free_list.is_empty() || free_regions_coming()) { | |
| 532 if (!_secondary_free_list.is_empty()) { | |
| 533 if (G1ConcRegionFreeingVerbose) { | |
| 534 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 535 "secondary_free_list has "SIZE_FORMAT" entries", | |
| 536 _secondary_free_list.length()); | |
| 537 } | |
| 538 // It looks as if there are free regions available on the | |
| 539 // secondary_free_list. Let's move them to the free_list and try | |
| 540 // again to allocate from it. | |
| 541 append_secondary_free_list(); | |
| 542 | |
| 543 assert(!_free_list.is_empty(), "if the secondary_free_list was not " | |
| 544 "empty we should have moved at least one entry to the free_list"); | |
| 545 HeapRegion* res = _free_list.remove_head(); | |
| 546 if (G1ConcRegionFreeingVerbose) { | |
| 547 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 548 "allocated "HR_FORMAT" from secondary_free_list", | |
| 549 HR_FORMAT_PARAMS(res)); | |
| 550 } | |
| 551 return res; | |
| 552 } | |
| 553 | |
| 554 // Wait here until we get notifed either when (a) there are no | |
| 555 // more free regions coming or (b) some regions have been moved on | |
| 556 // the secondary_free_list. | |
| 557 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 558 } | |
| 559 | |
| 560 if (G1ConcRegionFreeingVerbose) { | |
| 561 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 562 "could not allocate from secondary_free_list"); | |
| 563 } | |
| 564 return NULL; | |
| 565 } | |
| 566 | |
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567 HeapRegion* G1CollectedHeap::new_region(size_t word_size, bool do_expand) { |
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568 assert(!isHumongous(word_size) || word_size <= HeapRegion::GrainWords, |
| 2152 | 569 "the only time we use this to allocate a humongous region is " |
| 570 "when we are allocating a single humongous region"); | |
| 571 | |
| 572 HeapRegion* res; | |
| 573 if (G1StressConcRegionFreeing) { | |
| 574 if (!_secondary_free_list.is_empty()) { | |
| 575 if (G1ConcRegionFreeingVerbose) { | |
| 576 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 577 "forced to look at the secondary_free_list"); | |
| 578 } | |
| 2361 | 579 res = new_region_try_secondary_free_list(); |
| 2152 | 580 if (res != NULL) { |
| 581 return res; | |
| 582 } | |
| 583 } | |
| 584 } | |
| 585 res = _free_list.remove_head_or_null(); | |
| 586 if (res == NULL) { | |
| 587 if (G1ConcRegionFreeingVerbose) { | |
| 588 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 589 "res == NULL, trying the secondary_free_list"); | |
| 590 } | |
| 2361 | 591 res = new_region_try_secondary_free_list(); |
| 2152 | 592 } |
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593 if (res == NULL && do_expand && _expand_heap_after_alloc_failure) { |
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594 // Currently, only attempts to allocate GC alloc regions set |
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595 // do_expand to true. So, we should only reach here during a |
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596 // safepoint. If this assumption changes we might have to |
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597 // reconsider the use of _expand_heap_after_alloc_failure. |
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598 assert(SafepointSynchronize::is_at_safepoint(), "invariant"); |
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599 |
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600 ergo_verbose1(ErgoHeapSizing, |
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601 "attempt heap expansion", |
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602 ergo_format_reason("region allocation request failed") |
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603 ergo_format_byte("allocation request"), |
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604 word_size * HeapWordSize); |
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605 if (expand(word_size * HeapWordSize)) { |
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606 // Given that expand() succeeded in expanding the heap, and we |
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607 // always expand the heap by an amount aligned to the heap |
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608 // region size, the free list should in theory not be empty. So |
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609 // it would probably be OK to use remove_head(). But the extra |
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610 // check for NULL is unlikely to be a performance issue here (we |
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611 // just expanded the heap!) so let's just be conservative and |
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612 // use remove_head_or_null(). |
| 3766 | 613 res = _free_list.remove_head_or_null(); |
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614 } else { |
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615 _expand_heap_after_alloc_failure = false; |
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616 } |
| 342 | 617 } |
| 618 return res; | |
| 619 } | |
| 620 | |
| 3766 | 621 size_t G1CollectedHeap::humongous_obj_allocate_find_first(size_t num_regions, |
| 622 size_t word_size) { | |
| 2361 | 623 assert(isHumongous(word_size), "word_size should be humongous"); |
| 624 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
| 625 | |
| 3766 | 626 size_t first = G1_NULL_HRS_INDEX; |
| 2152 | 627 if (num_regions == 1) { |
| 628 // Only one region to allocate, no need to go through the slower | |
| 629 // path. The caller will attempt the expasion if this fails, so | |
| 630 // let's not try to expand here too. | |
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631 HeapRegion* hr = new_region(word_size, false /* do_expand */); |
| 2152 | 632 if (hr != NULL) { |
| 633 first = hr->hrs_index(); | |
| 634 } else { | |
| 3766 | 635 first = G1_NULL_HRS_INDEX; |
| 2152 | 636 } |
| 637 } else { | |
| 638 // We can't allocate humongous regions while cleanupComplete() is | |
| 639 // running, since some of the regions we find to be empty might not | |
| 640 // yet be added to the free list and it is not straightforward to | |
| 641 // know which list they are on so that we can remove them. Note | |
| 642 // that we only need to do this if we need to allocate more than | |
| 643 // one region to satisfy the current humongous allocation | |
| 644 // request. If we are only allocating one region we use the common | |
| 645 // region allocation code (see above). | |
| 646 wait_while_free_regions_coming(); | |
| 2361 | 647 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 648 |
| 649 if (free_regions() >= num_regions) { | |
| 3766 | 650 first = _hrs.find_contiguous(num_regions); |
| 651 if (first != G1_NULL_HRS_INDEX) { | |
| 652 for (size_t i = first; i < first + num_regions; ++i) { | |
| 653 HeapRegion* hr = region_at(i); | |
| 2152 | 654 assert(hr->is_empty(), "sanity"); |
| 2361 | 655 assert(is_on_master_free_list(hr), "sanity"); |
| 2152 | 656 hr->set_pending_removal(true); |
| 657 } | |
| 658 _free_list.remove_all_pending(num_regions); | |
| 659 } | |
| 660 } | |
| 661 } | |
| 662 return first; | |
| 663 } | |
| 664 | |
| 2361 | 665 HeapWord* |
| 3766 | 666 G1CollectedHeap::humongous_obj_allocate_initialize_regions(size_t first, |
| 2361 | 667 size_t num_regions, |
| 668 size_t word_size) { | |
| 3766 | 669 assert(first != G1_NULL_HRS_INDEX, "pre-condition"); |
| 2361 | 670 assert(isHumongous(word_size), "word_size should be humongous"); |
| 671 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
| 672 | |
| 673 // Index of last region in the series + 1. | |
| 3766 | 674 size_t last = first + num_regions; |
| 2361 | 675 |
| 676 // We need to initialize the region(s) we just discovered. This is | |
| 677 // a bit tricky given that it can happen concurrently with | |
| 678 // refinement threads refining cards on these regions and | |
| 679 // potentially wanting to refine the BOT as they are scanning | |
| 680 // those cards (this can happen shortly after a cleanup; see CR | |
| 681 // 6991377). So we have to set up the region(s) carefully and in | |
| 682 // a specific order. | |
| 683 | |
| 684 // The word size sum of all the regions we will allocate. | |
| 685 size_t word_size_sum = num_regions * HeapRegion::GrainWords; | |
| 686 assert(word_size <= word_size_sum, "sanity"); | |
| 687 | |
| 688 // This will be the "starts humongous" region. | |
| 3766 | 689 HeapRegion* first_hr = region_at(first); |
| 2361 | 690 // The header of the new object will be placed at the bottom of |
| 691 // the first region. | |
| 692 HeapWord* new_obj = first_hr->bottom(); | |
| 693 // This will be the new end of the first region in the series that | |
| 694 // should also match the end of the last region in the seriers. | |
| 695 HeapWord* new_end = new_obj + word_size_sum; | |
| 696 // This will be the new top of the first region that will reflect | |
| 697 // this allocation. | |
| 698 HeapWord* new_top = new_obj + word_size; | |
| 699 | |
| 700 // First, we need to zero the header of the space that we will be | |
| 701 // allocating. When we update top further down, some refinement | |
| 702 // threads might try to scan the region. By zeroing the header we | |
| 703 // ensure that any thread that will try to scan the region will | |
| 704 // come across the zero klass word and bail out. | |
| 705 // | |
| 706 // NOTE: It would not have been correct to have used | |
| 707 // CollectedHeap::fill_with_object() and make the space look like | |
| 708 // an int array. The thread that is doing the allocation will | |
| 709 // later update the object header to a potentially different array | |
| 710 // type and, for a very short period of time, the klass and length | |
| 711 // fields will be inconsistent. This could cause a refinement | |
| 712 // thread to calculate the object size incorrectly. | |
| 713 Copy::fill_to_words(new_obj, oopDesc::header_size(), 0); | |
| 714 | |
| 715 // We will set up the first region as "starts humongous". This | |
| 716 // will also update the BOT covering all the regions to reflect | |
| 717 // that there is a single object that starts at the bottom of the | |
| 718 // first region. | |
| 719 first_hr->set_startsHumongous(new_top, new_end); | |
| 720 | |
| 721 // Then, if there are any, we will set up the "continues | |
| 722 // humongous" regions. | |
| 723 HeapRegion* hr = NULL; | |
| 3766 | 724 for (size_t i = first + 1; i < last; ++i) { |
| 725 hr = region_at(i); | |
| 2361 | 726 hr->set_continuesHumongous(first_hr); |
| 727 } | |
| 728 // If we have "continues humongous" regions (hr != NULL), then the | |
| 729 // end of the last one should match new_end. | |
| 730 assert(hr == NULL || hr->end() == new_end, "sanity"); | |
| 731 | |
| 732 // Up to this point no concurrent thread would have been able to | |
| 733 // do any scanning on any region in this series. All the top | |
| 734 // fields still point to bottom, so the intersection between | |
| 735 // [bottom,top] and [card_start,card_end] will be empty. Before we | |
| 736 // update the top fields, we'll do a storestore to make sure that | |
| 737 // no thread sees the update to top before the zeroing of the | |
| 738 // object header and the BOT initialization. | |
| 739 OrderAccess::storestore(); | |
| 740 | |
| 741 // Now that the BOT and the object header have been initialized, | |
| 742 // we can update top of the "starts humongous" region. | |
| 743 assert(first_hr->bottom() < new_top && new_top <= first_hr->end(), | |
| 744 "new_top should be in this region"); | |
| 745 first_hr->set_top(new_top); | |
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746 if (_hr_printer.is_active()) { |
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747 HeapWord* bottom = first_hr->bottom(); |
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748 HeapWord* end = first_hr->orig_end(); |
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749 if ((first + 1) == last) { |
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750 // the series has a single humongous region |
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751 _hr_printer.alloc(G1HRPrinter::SingleHumongous, first_hr, new_top); |
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752 } else { |
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753 // the series has more than one humongous regions |
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754 _hr_printer.alloc(G1HRPrinter::StartsHumongous, first_hr, end); |
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755 } |
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756 } |
| 2361 | 757 |
| 758 // Now, we will update the top fields of the "continues humongous" | |
| 759 // regions. The reason we need to do this is that, otherwise, | |
| 760 // these regions would look empty and this will confuse parts of | |
| 761 // G1. For example, the code that looks for a consecutive number | |
| 762 // of empty regions will consider them empty and try to | |
| 763 // re-allocate them. We can extend is_empty() to also include | |
| 764 // !continuesHumongous(), but it is easier to just update the top | |
| 765 // fields here. The way we set top for all regions (i.e., top == | |
| 766 // end for all regions but the last one, top == new_top for the | |
| 767 // last one) is actually used when we will free up the humongous | |
| 768 // region in free_humongous_region(). | |
| 769 hr = NULL; | |
| 3766 | 770 for (size_t i = first + 1; i < last; ++i) { |
| 771 hr = region_at(i); | |
| 2361 | 772 if ((i + 1) == last) { |
| 773 // last continues humongous region | |
| 774 assert(hr->bottom() < new_top && new_top <= hr->end(), | |
| 775 "new_top should fall on this region"); | |
| 776 hr->set_top(new_top); | |
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777 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, new_top); |
| 2361 | 778 } else { |
| 779 // not last one | |
| 780 assert(new_top > hr->end(), "new_top should be above this region"); | |
| 781 hr->set_top(hr->end()); | |
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782 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, hr->end()); |
| 2361 | 783 } |
| 784 } | |
| 785 // If we have continues humongous regions (hr != NULL), then the | |
| 786 // end of the last one should match new_end and its top should | |
| 787 // match new_top. | |
| 788 assert(hr == NULL || | |
| 789 (hr->end() == new_end && hr->top() == new_top), "sanity"); | |
| 790 | |
| 791 assert(first_hr->used() == word_size * HeapWordSize, "invariant"); | |
| 792 _summary_bytes_used += first_hr->used(); | |
| 793 _humongous_set.add(first_hr); | |
| 794 | |
| 795 return new_obj; | |
| 796 } | |
| 797 | |
| 342 | 798 // If could fit into free regions w/o expansion, try. |
| 799 // Otherwise, if can expand, do so. | |
| 800 // Otherwise, if using ex regions might help, try with ex given back. | |
| 1973 | 801 HeapWord* G1CollectedHeap::humongous_obj_allocate(size_t word_size) { |
| 2152 | 802 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
| 803 | |
| 804 verify_region_sets_optional(); | |
| 342 | 805 |
| 806 size_t num_regions = | |
| 1973 | 807 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; |
| 342 | 808 size_t x_size = expansion_regions(); |
| 3766 | 809 size_t fs = _hrs.free_suffix(); |
| 810 size_t first = humongous_obj_allocate_find_first(num_regions, word_size); | |
| 811 if (first == G1_NULL_HRS_INDEX) { | |
| 2152 | 812 // The only thing we can do now is attempt expansion. |
| 342 | 813 if (fs + x_size >= num_regions) { |
|
2188
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|
814 // If the number of regions we're trying to allocate for this |
|
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|
815 // object is at most the number of regions in the free suffix, |
|
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|
816 // then the call to humongous_obj_allocate_find_first() above |
|
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|
817 // should have succeeded and we wouldn't be here. |
|
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|
818 // |
|
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|
819 // We should only be trying to expand when the free suffix is |
|
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|
820 // not sufficient for the object _and_ we have some expansion |
|
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|
821 // room available. |
|
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|
822 assert(num_regions > fs, "earlier allocation should have succeeded"); |
|
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|
823 |
|
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|
824 ergo_verbose1(ErgoHeapSizing, |
|
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|
825 "attempt heap expansion", |
|
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|
826 ergo_format_reason("humongous allocation request failed") |
|
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|
827 ergo_format_byte("allocation request"), |
|
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|
828 word_size * HeapWordSize); |
|
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|
829 if (expand((num_regions - fs) * HeapRegion::GrainBytes)) { |
| 3766 | 830 // Even though the heap was expanded, it might not have |
| 831 // reached the desired size. So, we cannot assume that the | |
| 832 // allocation will succeed. | |
|
2188
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|
833 first = humongous_obj_allocate_find_first(num_regions, word_size); |
|
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|
834 } |
| 2152 | 835 } |
| 836 } | |
| 837 | |
| 2361 | 838 HeapWord* result = NULL; |
| 3766 | 839 if (first != G1_NULL_HRS_INDEX) { |
| 2361 | 840 result = |
| 841 humongous_obj_allocate_initialize_regions(first, num_regions, word_size); | |
| 842 assert(result != NULL, "it should always return a valid result"); | |
|
3980
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|
843 |
|
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|
844 // A successful humongous object allocation changes the used space |
|
8229bd737950
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|
845 // information of the old generation so we need to recalculate the |
|
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|
846 // sizes and update the jstat counters here. |
|
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|
847 g1mm()->update_sizes(); |
| 2152 | 848 } |
| 849 | |
| 850 verify_region_sets_optional(); | |
| 2361 | 851 |
| 852 return result; | |
| 342 | 853 } |
| 854 | |
| 1973 | 855 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
| 856 assert_heap_not_locked_and_not_at_safepoint(); | |
|
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|
857 assert(!isHumongous(word_size), "we do not allow humongous TLABs"); |
|
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|
858 |
|
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|
859 unsigned int dummy_gc_count_before; |
|
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|
860 return attempt_allocation(word_size, &dummy_gc_count_before); |
| 342 | 861 } |
| 862 | |
| 863 HeapWord* | |
| 864 G1CollectedHeap::mem_allocate(size_t word_size, | |
| 1973 | 865 bool* gc_overhead_limit_was_exceeded) { |
| 866 assert_heap_not_locked_and_not_at_safepoint(); | |
| 342 | 867 |
|
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|
868 // Loop until the allocation is satisified, or unsatisfied after GC. |
| 1973 | 869 for (int try_count = 1; /* we'll return */; try_count += 1) { |
| 870 unsigned int gc_count_before; | |
|
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|
871 |
|
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|
872 HeapWord* result = NULL; |
|
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|
873 if (!isHumongous(word_size)) { |
|
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|
874 result = attempt_allocation(word_size, &gc_count_before); |
|
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|
875 } else { |
|
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|
876 result = attempt_allocation_humongous(word_size, &gc_count_before); |
|
abdfc822206f
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|
877 } |
|
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|
878 if (result != NULL) { |
|
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|
879 return result; |
| 342 | 880 } |
| 881 | |
| 882 // Create the garbage collection operation... | |
| 1973 | 883 VM_G1CollectForAllocation op(gc_count_before, word_size); |
| 342 | 884 // ...and get the VM thread to execute it. |
| 885 VMThread::execute(&op); | |
| 1973 | 886 |
| 887 if (op.prologue_succeeded() && op.pause_succeeded()) { | |
| 888 // If the operation was successful we'll return the result even | |
| 889 // if it is NULL. If the allocation attempt failed immediately | |
| 890 // after a Full GC, it's unlikely we'll be able to allocate now. | |
| 891 HeapWord* result = op.result(); | |
| 892 if (result != NULL && !isHumongous(word_size)) { | |
| 893 // Allocations that take place on VM operations do not do any | |
| 894 // card dirtying and we have to do it here. We only have to do | |
| 895 // this for non-humongous allocations, though. | |
| 896 dirty_young_block(result, word_size); | |
| 897 } | |
| 342 | 898 return result; |
| 1973 | 899 } else { |
| 900 assert(op.result() == NULL, | |
| 901 "the result should be NULL if the VM op did not succeed"); | |
| 342 | 902 } |
| 903 | |
| 904 // Give a warning if we seem to be looping forever. | |
| 905 if ((QueuedAllocationWarningCount > 0) && | |
| 906 (try_count % QueuedAllocationWarningCount == 0)) { | |
| 1973 | 907 warning("G1CollectedHeap::mem_allocate retries %d times", try_count); |
| 342 | 908 } |
| 909 } | |
| 1973 | 910 |
| 911 ShouldNotReachHere(); | |
|
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|
912 return NULL; |
| 342 | 913 } |
| 914 | |
|
2433
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|
915 HeapWord* G1CollectedHeap::attempt_allocation_slow(size_t word_size, |
|
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|
916 unsigned int *gc_count_before_ret) { |
|
abdfc822206f
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|
917 // Make sure you read the note in attempt_allocation_humongous(). |
|
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|
918 |
|
abdfc822206f
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|
919 assert_heap_not_locked_and_not_at_safepoint(); |
|
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|
920 assert(!isHumongous(word_size), "attempt_allocation_slow() should not " |
|
abdfc822206f
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|
921 "be called for humongous allocation requests"); |
|
abdfc822206f
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diff
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|
922 |
|
abdfc822206f
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changeset
|
923 // We should only get here after the first-level allocation attempt |
|
abdfc822206f
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|
924 // (attempt_allocation()) failed to allocate. |
|
abdfc822206f
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diff
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|
925 |
|
abdfc822206f
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diff
changeset
|
926 // 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
|
927 // allocation or b) we successfully schedule a collection which |
|
abdfc822206f
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diff
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|
928 // fails to perform the allocation. b) is the only case when we'll |
|
abdfc822206f
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2432
diff
changeset
|
929 // return NULL. |
|
abdfc822206f
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diff
changeset
|
930 HeapWord* result = NULL; |
|
abdfc822206f
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diff
changeset
|
931 for (int try_count = 1; /* we'll return */; try_count += 1) { |
|
abdfc822206f
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diff
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|
932 bool should_try_gc; |
|
abdfc822206f
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changeset
|
933 unsigned int gc_count_before; |
|
abdfc822206f
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|
934 |
|
abdfc822206f
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|
935 { |
|
abdfc822206f
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diff
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|
936 MutexLockerEx x(Heap_lock); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
937 |
|
abdfc822206f
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diff
changeset
|
938 result = _mutator_alloc_region.attempt_allocation_locked(word_size, |
|
abdfc822206f
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|
939 false /* bot_updates */); |
|
abdfc822206f
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diff
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|
940 if (result != NULL) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
941 return result; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
942 } |
|
abdfc822206f
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parents:
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diff
changeset
|
943 |
|
abdfc822206f
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2432
diff
changeset
|
944 // If we reach here, attempt_allocation_locked() above failed to |
|
abdfc822206f
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diff
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|
945 // allocate a new region. So the mutator alloc region should be NULL. |
|
abdfc822206f
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diff
changeset
|
946 assert(_mutator_alloc_region.get() == NULL, "only way to get here"); |
|
abdfc822206f
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|
947 |
|
abdfc822206f
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parents:
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diff
changeset
|
948 if (GC_locker::is_active_and_needs_gc()) { |
|
abdfc822206f
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diff
changeset
|
949 if (g1_policy()->can_expand_young_list()) { |
|
3914
20213c8a3c40
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|
950 // No need for an ergo verbose message here, |
|
20213c8a3c40
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3886
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|
951 // can_expand_young_list() does this when it returns true. |
|
2433
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|
952 result = _mutator_alloc_region.attempt_allocation_force(word_size, |
|
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|
953 false /* bot_updates */); |
|
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diff
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|
954 if (result != NULL) { |
|
abdfc822206f
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diff
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|
955 return result; |
|
abdfc822206f
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diff
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|
956 } |
|
abdfc822206f
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|
957 } |
|
abdfc822206f
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diff
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|
958 should_try_gc = false; |
|
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|
959 } else { |
|
abdfc822206f
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|
960 // Read the GC count while still holding the Heap_lock. |
|
4910
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7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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4875
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|
961 gc_count_before = total_collections(); |
|
2433
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|
962 should_try_gc = true; |
|
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|
963 } |
|
abdfc822206f
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|
964 } |
|
abdfc822206f
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|
965 |
|
abdfc822206f
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|
966 if (should_try_gc) { |
|
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|
967 bool succeeded; |
|
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|
968 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
|
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|
969 if (result != NULL) { |
|
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|
970 assert(succeeded, "only way to get back a non-NULL result"); |
|
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|
971 return result; |
|
abdfc822206f
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diff
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|
972 } |
|
abdfc822206f
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diff
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|
973 |
|
abdfc822206f
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diff
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|
974 if (succeeded) { |
|
abdfc822206f
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diff
changeset
|
975 // If we get here we successfully scheduled a collection which |
|
abdfc822206f
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|
976 // failed to allocate. No point in trying to allocate |
|
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diff
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|
977 // further. We'll just return NULL. |
|
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|
978 MutexLockerEx x(Heap_lock); |
|
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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parents:
4875
diff
changeset
|
979 *gc_count_before_ret = total_collections(); |
|
2433
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|
980 return NULL; |
|
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changeset
|
981 } |
|
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982 } else { |
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983 GC_locker::stall_until_clear(); |
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984 } |
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985 |
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986 // We can reach here if we were unsuccessul in scheduling a |
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987 // collection (because another thread beat us to it) or if we were |
|
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988 // stalled due to the GC locker. In either can we should retry the |
|
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989 // allocation attempt in case another thread successfully |
|
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990 // performed a collection and reclaimed enough space. We do the |
|
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991 // first attempt (without holding the Heap_lock) here and the |
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992 // follow-on attempt will be at the start of the next loop |
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993 // iteration (after taking the Heap_lock). |
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994 result = _mutator_alloc_region.attempt_allocation(word_size, |
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995 false /* bot_updates */); |
|
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996 if (result != NULL) { |
|
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|
997 return result; |
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998 } |
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999 |
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1000 // Give a warning if we seem to be looping forever. |
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1001 if ((QueuedAllocationWarningCount > 0) && |
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1002 (try_count % QueuedAllocationWarningCount == 0)) { |
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1003 warning("G1CollectedHeap::attempt_allocation_slow() " |
|
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1004 "retries %d times", try_count); |
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1005 } |
|
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1006 } |
|
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1007 |
|
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1008 ShouldNotReachHere(); |
|
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1009 return NULL; |
|
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1010 } |
|
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1011 |
|
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1012 HeapWord* G1CollectedHeap::attempt_allocation_humongous(size_t word_size, |
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1013 unsigned int * gc_count_before_ret) { |
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1014 // The structure of this method has a lot of similarities to |
|
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1015 // attempt_allocation_slow(). The reason these two were not merged |
|
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1016 // into a single one is that such a method would require several "if |
|
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1017 // allocation is not humongous do this, otherwise do that" |
|
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1018 // conditional paths which would obscure its flow. In fact, an early |
|
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1019 // version of this code did use a unified method which was harder to |
|
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1020 // follow and, as a result, it had subtle bugs that were hard to |
|
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1021 // track down. So keeping these two methods separate allows each to |
|
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1022 // be more readable. It will be good to keep these two in sync as |
|
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1023 // much as possible. |
|
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1024 |
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1025 assert_heap_not_locked_and_not_at_safepoint(); |
|
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1026 assert(isHumongous(word_size), "attempt_allocation_humongous() " |
|
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1027 "should only be called for humongous allocations"); |
|
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|
1028 |
|
4834
6a78aa6ac1ff
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1029 // Humongous objects can exhaust the heap quickly, so we should check if we |
|
6a78aa6ac1ff
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|
1030 // need to start a marking cycle at each humongous object allocation. We do |
|
6a78aa6ac1ff
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|
1031 // the check before we do the actual allocation. The reason for doing it |
|
6a78aa6ac1ff
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1032 // before the allocation is that we avoid having to keep track of the newly |
|
6a78aa6ac1ff
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|
1033 // allocated memory while we do a GC. |
|
4910
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|
1034 if (g1_policy()->need_to_start_conc_mark("concurrent humongous allocation", |
|
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|
1035 word_size)) { |
|
4834
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|
1036 collect(GCCause::_g1_humongous_allocation); |
|
6a78aa6ac1ff
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|
1037 } |
|
6a78aa6ac1ff
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|
1038 |
|
2433
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|
1039 // We will loop until a) we manage to successfully perform the |
|
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|
1040 // allocation or b) we successfully schedule a collection which |
|
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|
1041 // fails to perform the allocation. b) is the only case when we'll |
|
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|
1042 // return NULL. |
|
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|
1043 HeapWord* result = NULL; |
|
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|
1044 for (int try_count = 1; /* we'll return */; try_count += 1) { |
|
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|
1045 bool should_try_gc; |
|
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|
1046 unsigned int gc_count_before; |
|
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|
1047 |
|
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|
1048 { |
|
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|
1049 MutexLockerEx x(Heap_lock); |
|
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|
1050 |
|
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|
1051 // Given that humongous objects are not allocated in young |
|
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|
1052 // regions, we'll first try to do the allocation without doing a |
|
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|
1053 // collection hoping that there's enough space in the heap. |
|
abdfc822206f
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|
1054 result = humongous_obj_allocate(word_size); |
|
abdfc822206f
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|
1055 if (result != NULL) { |
|
abdfc822206f
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|
1056 return result; |
|
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diff
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|
1057 } |
|
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|
1058 |
|
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|
1059 if (GC_locker::is_active_and_needs_gc()) { |
|
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|
1060 should_try_gc = false; |
|
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|
1061 } else { |
|
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|
1062 // Read the GC count while still holding the Heap_lock. |
|
4910
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7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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|
1063 gc_count_before = total_collections(); |
|
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|
1064 should_try_gc = true; |
|
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|
1065 } |
|
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|
1066 } |
|
abdfc822206f
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|
1067 |
|
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|
1068 if (should_try_gc) { |
|
abdfc822206f
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|
1069 // If we failed to allocate the humongous object, we should try to |
|
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|
1070 // do a collection pause (if we're allowed) in case it reclaims |
|
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|
1071 // enough space for the allocation to succeed after the pause. |
|
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|
1072 |
|
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|
1073 bool succeeded; |
|
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|
1074 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
|
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|
1075 if (result != NULL) { |
|
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|
1076 assert(succeeded, "only way to get back a non-NULL result"); |
|
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|
1077 return result; |
|
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diff
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|
1078 } |
|
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|
1079 |
|
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diff
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|
1080 if (succeeded) { |
|
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|
1081 // If we get here we successfully scheduled a collection which |
|
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|
1082 // failed to allocate. No point in trying to allocate |
|
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|
1083 // further. We'll just return NULL. |
|
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|
1084 MutexLockerEx x(Heap_lock); |
|
4910
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|
1085 *gc_count_before_ret = total_collections(); |
|
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|
1086 return NULL; |
|
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diff
changeset
|
1087 } |
|
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diff
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|
1088 } else { |
|
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diff
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|
1089 GC_locker::stall_until_clear(); |
|
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|
1090 } |
|
abdfc822206f
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diff
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|
1091 |
|
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|
1092 // We can reach here if we were unsuccessul in scheduling a |
|
abdfc822206f
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|
1093 // collection (because another thread beat us to it) or if we were |
|
abdfc822206f
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|
1094 // stalled due to the GC locker. In either can we should retry the |
|
abdfc822206f
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|
1095 // allocation attempt in case another thread successfully |
|
abdfc822206f
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|
1096 // performed a collection and reclaimed enough space. Give a |
|
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|
1097 // warning if we seem to be looping forever. |
|
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diff
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|
1098 |
|
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|
1099 if ((QueuedAllocationWarningCount > 0) && |
|
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|
1100 (try_count % QueuedAllocationWarningCount == 0)) { |
|
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|
1101 warning("G1CollectedHeap::attempt_allocation_humongous() " |
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1102 "retries %d times", try_count); |
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1103 } |
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1104 } |
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1105 |
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1106 ShouldNotReachHere(); |
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1107 return NULL; |
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1108 } |
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1109 |
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1110 HeapWord* G1CollectedHeap::attempt_allocation_at_safepoint(size_t word_size, |
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1111 bool expect_null_mutator_alloc_region) { |
| 2152 | 1112 assert_at_safepoint(true /* should_be_vm_thread */); |
|
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1113 assert(_mutator_alloc_region.get() == NULL || |
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1114 !expect_null_mutator_alloc_region, |
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1115 "the current alloc region was unexpectedly found to be non-NULL"); |
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1116 |
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1117 if (!isHumongous(word_size)) { |
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1118 return _mutator_alloc_region.attempt_allocation_locked(word_size, |
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1119 false /* bot_updates */); |
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1120 } else { |
|
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1121 HeapWord* result = humongous_obj_allocate(word_size); |
|
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1122 if (result != NULL && g1_policy()->need_to_start_conc_mark("STW humongous allocation")) { |
|
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1123 g1_policy()->set_initiate_conc_mark_if_possible(); |
|
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1124 } |
|
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1125 return result; |
|
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1126 } |
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1127 |
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1128 ShouldNotReachHere(); |
| 342 | 1129 } |
| 1130 | |
| 1131 class PostMCRemSetClearClosure: public HeapRegionClosure { | |
| 1132 ModRefBarrierSet* _mr_bs; | |
| 1133 public: | |
| 1134 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 1135 bool doHeapRegion(HeapRegion* r) { | |
| 1136 r->reset_gc_time_stamp(); | |
| 1137 if (r->continuesHumongous()) | |
| 1138 return false; | |
| 1139 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 1140 if (hrrs != NULL) hrrs->clear(); | |
| 1141 // You might think here that we could clear just the cards | |
| 1142 // corresponding to the used region. But no: if we leave a dirty card | |
| 1143 // in a region we might allocate into, then it would prevent that card | |
| 1144 // from being enqueued, and cause it to be missed. | |
| 1145 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
| 1146 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
| 1147 return false; | |
| 1148 } | |
| 1149 }; | |
| 1150 | |
| 1151 | |
| 1152 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
| 1153 ModRefBarrierSet* _mr_bs; | |
| 1154 public: | |
| 1155 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 1156 bool doHeapRegion(HeapRegion* r) { | |
| 1157 if (r->continuesHumongous()) return false; | |
| 1158 if (r->used_region().word_size() != 0) { | |
| 1159 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
| 1160 } | |
| 1161 return false; | |
| 1162 } | |
| 1163 }; | |
| 1164 | |
|
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1165 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
|
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1166 G1CollectedHeap* _g1h; |
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1167 UpdateRSOopClosure _cl; |
|
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1168 int _worker_i; |
|
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1169 public: |
|
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1170 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
| 1861 | 1171 _cl(g1->g1_rem_set(), worker_i), |
|
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1172 _worker_i(worker_i), |
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1173 _g1h(g1) |
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1174 { } |
|
1960
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1175 |
|
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1176 bool doHeapRegion(HeapRegion* r) { |
|
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1177 if (!r->continuesHumongous()) { |
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1178 _cl.set_from(r); |
|
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1179 r->oop_iterate(&_cl); |
|
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1180 } |
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1181 return false; |
|
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1182 } |
|
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1183 }; |
|
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1184 |
|
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1185 class ParRebuildRSTask: public AbstractGangTask { |
|
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1186 G1CollectedHeap* _g1; |
|
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1187 public: |
|
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1188 ParRebuildRSTask(G1CollectedHeap* g1) |
|
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1189 : AbstractGangTask("ParRebuildRSTask"), |
|
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1190 _g1(g1) |
|
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1191 { } |
|
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1192 |
|
4728
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|
1193 void work(uint worker_id) { |
|
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1194 RebuildRSOutOfRegionClosure rebuild_rs(_g1, worker_id); |
|
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1195 _g1->heap_region_par_iterate_chunked(&rebuild_rs, worker_id, |
|
4095
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|
1196 _g1->workers()->active_workers(), |
|
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1197 HeapRegion::RebuildRSClaimValue); |
|
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1198 } |
|
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1199 }; |
|
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|
1200 |
|
3778
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|
1201 class PostCompactionPrinterClosure: public HeapRegionClosure { |
|
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1202 private: |
|
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1203 G1HRPrinter* _hr_printer; |
|
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1204 public: |
|
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|
1205 bool doHeapRegion(HeapRegion* hr) { |
|
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1206 assert(!hr->is_young(), "not expecting to find young regions"); |
|
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1207 // We only generate output for non-empty regions. |
|
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1208 if (!hr->is_empty()) { |
|
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1209 if (!hr->isHumongous()) { |
|
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1210 _hr_printer->post_compaction(hr, G1HRPrinter::Old); |
|
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1211 } else if (hr->startsHumongous()) { |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
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|
1212 if (hr->capacity() == HeapRegion::GrainBytes) { |
|
3778
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1213 // single humongous region |
|
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1214 _hr_printer->post_compaction(hr, G1HRPrinter::SingleHumongous); |
|
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1215 } else { |
|
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1216 _hr_printer->post_compaction(hr, G1HRPrinter::StartsHumongous); |
|
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1217 } |
|
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1218 } else { |
|
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1219 assert(hr->continuesHumongous(), "only way to get here"); |
|
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1220 _hr_printer->post_compaction(hr, G1HRPrinter::ContinuesHumongous); |
|
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1221 } |
|
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|
1222 } |
|
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|
1223 return false; |
|
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|
1224 } |
|
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|
1225 |
|
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|
1226 PostCompactionPrinterClosure(G1HRPrinter* hr_printer) |
|
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1227 : _hr_printer(hr_printer) { } |
|
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|
1228 }; |
|
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|
1229 |
| 1973 | 1230 bool G1CollectedHeap::do_collection(bool explicit_gc, |
|
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|
1231 bool clear_all_soft_refs, |
| 342 | 1232 size_t word_size) { |
| 2152 | 1233 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1234 | |
|
1359
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
1235 if (GC_locker::check_active_before_gc()) { |
| 1973 | 1236 return false; |
|
1359
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|
1237 } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
1238 |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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diff
changeset
|
1239 SvcGCMarker sgcm(SvcGCMarker::FULL); |
| 342 | 1240 ResourceMark rm; |
| 1241 | |
|
4872
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7141200: log some interesting information in ring buffers for crashes
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|
1242 print_heap_before_gc(); |
|
838
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6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
1243 |
| 4072 | 1244 HRSPhaseSetter x(HRSPhaseFullGC); |
| 2152 | 1245 verify_region_sets_optional(); |
| 342 | 1246 |
|
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|
1247 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
|
0bfd3fb24150
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|
1248 collector_policy()->should_clear_all_soft_refs(); |
|
0bfd3fb24150
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|
1249 |
|
0bfd3fb24150
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|
1250 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
|
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1251 |
| 342 | 1252 { |
| 1253 IsGCActiveMark x; | |
| 1254 | |
| 1255 // Timing | |
|
1656
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|
1256 bool system_gc = (gc_cause() == GCCause::_java_lang_system_gc); |
|
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|
1257 assert(!system_gc || explicit_gc, "invariant"); |
| 342 | 1258 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
| 1259 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
|
1656
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|
1260 TraceTime t(system_gc ? "Full GC (System.gc())" : "Full GC", |
|
1387
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6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
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|
1261 PrintGC, true, gclog_or_tty); |
| 342 | 1262 |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
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|
1263 TraceCollectorStats tcs(g1mm()->full_collection_counters()); |
|
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
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parents:
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diff
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|
1264 TraceMemoryManagerStats tms(true /* fullGC */, gc_cause()); |
|
1089
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|
1265 |
| 342 | 1266 double start = os::elapsedTime(); |
| 1267 g1_policy()->record_full_collection_start(); | |
| 1268 | |
|
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|
1269 // Note: When we have a more flexible GC logging framework that |
|
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|
1270 // allows us to add optional attributes to a GC log record we |
|
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|
1271 // could consider timing and reporting how long we wait in the |
|
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|
1272 // following two methods. |
| 2152 | 1273 wait_while_free_regions_coming(); |
|
4837
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|
1274 // If we start the compaction before the CM threads finish |
|
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|
1275 // scanning the root regions we might trip them over as we'll |
|
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|
1276 // be moving objects / updating references. So let's wait until |
|
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|
1277 // they are done. By telling them to abort, they should complete |
|
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|
1278 // early. |
|
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|
1279 _cm->root_regions()->abort(); |
|
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|
1280 _cm->root_regions()->wait_until_scan_finished(); |
| 2361 | 1281 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 1282 |
| 342 | 1283 gc_prologue(true); |
|
838
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6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
1284 increment_total_collections(true /* full gc */); |
| 342 | 1285 |
| 1286 size_t g1h_prev_used = used(); | |
| 1287 assert(used() == recalculate_used(), "Should be equal"); | |
| 1288 | |
| 1289 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
| 1290 HandleMark hm; // Discard invalid handles created during verification | |
|
2433
abdfc822206f
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|
1291 gclog_or_tty->print(" VerifyBeforeGC:"); |
| 342 | 1292 prepare_for_verify(); |
|
3772
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changeset
|
1293 Universe::verify(/* allow dirty */ true, |
|
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|
1294 /* silent */ false, |
|
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|
1295 /* option */ VerifyOption_G1UsePrevMarking); |
|
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|
1296 |
| 342 | 1297 } |
|
3869
7f776886a215
6810861: G1: support -XX:+{PrintClassHistogram,HeapDump}{Before,After}FullGC
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parents:
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diff
changeset
|
1298 pre_full_gc_dump(); |
| 342 | 1299 |
| 1300 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 1301 | |
|
3979
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|
1302 // Disable discovery and empty the discovered lists |
|
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|
1303 // for the CM ref processor. |
|
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|
1304 ref_processor_cm()->disable_discovery(); |
|
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|
1305 ref_processor_cm()->abandon_partial_discovery(); |
|
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|
1306 ref_processor_cm()->verify_no_references_recorded(); |
| 342 | 1307 |
| 1308 // Abandon current iterations of concurrent marking and concurrent | |
|
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|
1309 // refinement, if any are in progress. We have to do this before |
|
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|
1310 // wait_until_scan_finished() below. |
| 342 | 1311 concurrent_mark()->abort(); |
| 1312 | |
| 1313 // Make sure we'll choose a new allocation region afterwards. | |
|
2433
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|
1314 release_mutator_alloc_region(); |
| 636 | 1315 abandon_gc_alloc_regions(); |
| 1861 | 1316 g1_rem_set()->cleanupHRRS(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
1317 |
|
3778
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|
1318 // We should call this after we retire any currently active alloc |
|
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changeset
|
1319 // regions so that all the ALLOC / RETIRE events are generated |
|
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|
1320 // before the start GC event. |
|
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|
1321 _hr_printer.start_gc(true /* full */, (size_t) total_collections()); |
|
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|
1322 |
|
1394
1316cec51b4d
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diff
changeset
|
1323 // We may have added regions to the current incremental collection |
|
1316cec51b4d
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parents:
1391
diff
changeset
|
1324 // set between the last GC or pause and now. We need to clear the |
|
1316cec51b4d
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diff
changeset
|
1325 // incremental collection set and then start rebuilding it afresh |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
1326 // after this full GC. |
|
1316cec51b4d
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diff
changeset
|
1327 abandon_collection_set(g1_policy()->inc_cset_head()); |
|
1316cec51b4d
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diff
changeset
|
1328 g1_policy()->clear_incremental_cset(); |
|
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diff
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|
1329 g1_policy()->stop_incremental_cset_building(); |
|
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|
1330 |
| 4072 | 1331 tear_down_region_sets(false /* free_list_only */); |
| 4710 | 1332 g1_policy()->set_gcs_are_young(true); |
| 342 | 1333 |
|
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|
1334 // See the comments in g1CollectedHeap.hpp and |
|
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changeset
|
1335 // G1CollectedHeap::ref_processing_init() about |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
1336 // how reference processing currently works in G1. |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
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diff
changeset
|
1337 |
|
3979
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|
1338 // Temporarily make discovery by the STW ref processor single threaded (non-MT). |
|
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changeset
|
1339 ReferenceProcessorMTDiscoveryMutator stw_rp_disc_ser(ref_processor_stw(), false); |
|
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|
1340 |
|
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changeset
|
1341 // Temporarily clear the STW ref processor's _is_alive_non_header field. |
|
4dfb2df418f2
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changeset
|
1342 ReferenceProcessorIsAliveMutator stw_rp_is_alive_null(ref_processor_stw(), NULL); |
|
4dfb2df418f2
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|
1343 |
|
4dfb2df418f2
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changeset
|
1344 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
|
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parents:
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|
1345 ref_processor_stw()->setup_policy(do_clear_all_soft_refs); |
|
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|
1346 |
| 342 | 1347 // Do collection work |
| 1348 { | |
| 1349 HandleMark hm; // Discard invalid handles created during gc | |
|
3979
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|
1350 G1MarkSweep::invoke_at_safepoint(ref_processor_stw(), do_clear_all_soft_refs); |
| 342 | 1351 } |
|
3979
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|
1352 |
| 2152 | 1353 assert(free_regions() == 0, "we should not have added any free regions"); |
| 4072 | 1354 rebuild_region_sets(false /* free_list_only */); |
| 342 | 1355 |
|
3979
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changeset
|
1356 // Enqueue any discovered reference objects that have |
|
4dfb2df418f2
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|
1357 // not been removed from the discovered lists. |
|
4dfb2df418f2
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diff
changeset
|
1358 ref_processor_stw()->enqueue_discovered_references(); |
| 342 | 1359 |
| 1360 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 1361 | |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
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diff
changeset
|
1362 MemoryService::track_memory_usage(); |
|
db0d5eba9d20
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diff
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|
1363 |
| 342 | 1364 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
| 1365 HandleMark hm; // Discard invalid handles created during verification | |
| 1366 gclog_or_tty->print(" VerifyAfterGC:"); | |
|
637
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
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parents:
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diff
changeset
|
1367 prepare_for_verify(); |
|
3772
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changeset
|
1368 Universe::verify(/* allow dirty */ false, |
|
6747fd0512e0
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|
1369 /* silent */ false, |
|
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|
1370 /* option */ VerifyOption_G1UsePrevMarking); |
|
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changeset
|
1371 |
| 342 | 1372 } |
|
3979
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|
1373 |
|
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diff
changeset
|
1374 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
|
4dfb2df418f2
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|
1375 ref_processor_stw()->verify_no_references_recorded(); |
|
4dfb2df418f2
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|
1376 |
|
4dfb2df418f2
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changeset
|
1377 // Note: since we've just done a full GC, concurrent |
|
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|
1378 // marking is no longer active. Therefore we need not |
|
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changeset
|
1379 // re-enable reference discovery for the CM ref processor. |
|
4dfb2df418f2
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changeset
|
1380 // That will be done at the start of the next marking cycle. |
|
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changeset
|
1381 assert(!ref_processor_cm()->discovery_enabled(), "Postcondition"); |
|
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changeset
|
1382 ref_processor_cm()->verify_no_references_recorded(); |
| 342 | 1383 |
| 1384 reset_gc_time_stamp(); | |
| 1385 // Since everything potentially moved, we will clear all remembered | |
|
626
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diff
changeset
|
1386 // sets, and clear all cards. Later we will rebuild remebered |
|
87fa6e083d82
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diff
changeset
|
1387 // sets. We will also reset the GC time stamps of the regions. |
| 342 | 1388 PostMCRemSetClearClosure rs_clear(mr_bs()); |
| 1389 heap_region_iterate(&rs_clear); | |
| 1390 | |
| 1391 // Resize the heap if necessary. | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
changeset
|
1392 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
| 342 | 1393 |
|
3778
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|
1394 if (_hr_printer.is_active()) { |
|
5f6f2615433a
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|
1395 // We should do this after we potentially resize the heap so |
|
5f6f2615433a
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|
1396 // that all the COMMIT / UNCOMMIT events are generated before |
|
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|
1397 // the end GC event. |
|
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|
1398 |
|
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changeset
|
1399 PostCompactionPrinterClosure cl(hr_printer()); |
|
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|
1400 heap_region_iterate(&cl); |
|
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|
1401 |
|
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changeset
|
1402 _hr_printer.end_gc(true /* full */, (size_t) total_collections()); |
|
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|
1403 } |
|
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changeset
|
1404 |
| 342 | 1405 if (_cg1r->use_cache()) { |
| 1406 _cg1r->clear_and_record_card_counts(); | |
| 1407 _cg1r->clear_hot_cache(); | |
| 1408 } | |
| 1409 | |
|
626
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diff
changeset
|
1410 // Rebuild remembered sets of all regions. |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
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1755
diff
changeset
|
1411 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
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parents:
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diff
changeset
|
1412 uint n_workers = |
|
4095
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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
changeset
|
1413 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
|
bca17e38de00
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changeset
|
1414 workers()->active_workers(), |
|
bca17e38de00
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changeset
|
1415 Threads::number_of_non_daemon_threads()); |
|
bca17e38de00
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changeset
|
1416 assert(UseDynamicNumberOfGCThreads || |
|
bca17e38de00
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changeset
|
1417 n_workers == workers()->total_workers(), |
|
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changeset
|
1418 "If not dynamic should be using all the workers"); |
|
bca17e38de00
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changeset
|
1419 workers()->set_active_workers(n_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
1420 // Set parallel threads in the heap (_n_par_threads) only |
|
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1421 // before a parallel phase and always reset it to 0 after |
|
bca17e38de00
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|
1422 // the phase so that the number of parallel threads does |
|
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|
1423 // no get carried forward to a serial phase where there |
|
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1424 // may be code that is "possibly_parallel". |
|
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1425 set_par_threads(n_workers); |
|
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|
1426 |
|
626
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1427 ParRebuildRSTask rebuild_rs_task(this); |
|
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1428 assert(check_heap_region_claim_values( |
|
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|
1429 HeapRegion::InitialClaimValue), "sanity check"); |
|
4095
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|
1430 assert(UseDynamicNumberOfGCThreads || |
|
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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
1431 workers()->active_workers() == workers()->total_workers(), |
|
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|
1432 "Unless dynamic should use total workers"); |
|
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|
1433 // Use the most recent number of active workers |
|
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|
1434 assert(workers()->active_workers() > 0, |
|
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|
1435 "Active workers not properly set"); |
|
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|
1436 set_par_threads(workers()->active_workers()); |
|
626
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|
1437 workers()->run_task(&rebuild_rs_task); |
|
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|
1438 set_par_threads(0); |
|
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|
1439 assert(check_heap_region_claim_values( |
|
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1440 HeapRegion::RebuildRSClaimValue), "sanity check"); |
|
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1441 reset_heap_region_claim_values(); |
|
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|
1442 } else { |
|
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|
1443 RebuildRSOutOfRegionClosure rebuild_rs(this); |
|
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|
1444 heap_region_iterate(&rebuild_rs); |
|
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|
1445 } |
|
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|
1446 |
| 342 | 1447 if (PrintGC) { |
| 1448 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
| 1449 } | |
| 1450 | |
| 1451 if (true) { // FIXME | |
| 1452 // Ask the permanent generation to adjust size for full collections | |
| 1453 perm()->compute_new_size(); | |
| 1454 } | |
| 1455 | |
|
1394
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|
1456 // Start a new incremental collection set for the next pause |
|
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|
1457 assert(g1_policy()->collection_set() == NULL, "must be"); |
|
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|
1458 g1_policy()->start_incremental_cset_building(); |
|
1316cec51b4d
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|
1459 |
|
1316cec51b4d
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|
1460 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
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|
1461 // regions to the incremental collection set for the next |
|
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|
1462 // evacuation pause. |
|
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|
1463 clear_cset_fast_test(); |
|
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|
1464 |
|
2433
abdfc822206f
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|
1465 init_mutator_alloc_region(); |
|
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|
1466 |
| 342 | 1467 double end = os::elapsedTime(); |
| 1468 g1_policy()->record_full_collection_end(); | |
| 1469 | |
|
546
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6690928: Use spinning in combination with yields for workstealing termination.
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|
1470 #ifdef TRACESPINNING |
|
05c6d52fa7a9
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|
1471 ParallelTaskTerminator::print_termination_counts(); |
|
05c6d52fa7a9
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|
1472 #endif |
|
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|
1473 |
| 342 | 1474 gc_epilogue(true); |
| 1475 | |
| 794 | 1476 // Discard all rset updates |
| 1477 JavaThread::dirty_card_queue_set().abandon_logs(); | |
|
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
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|
1478 assert(!G1DeferredRSUpdate |
|
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|
1479 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
| 342 | 1480 } |
| 1481 | |
|
3867
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|
1482 _young_list->reset_sampled_info(); |
|
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|
1483 // At this point there should be no regions in the |
|
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|
1484 // entire heap tagged as young. |
|
ff53346271fe
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|
1485 assert( check_young_list_empty(true /* check_heap */), |
|
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diff
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|
1486 "young list should be empty at this point"); |
|
838
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|
1487 |
|
1656
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|
1488 // Update the number of full collections that have been completed. |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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diff
changeset
|
1489 increment_full_collections_completed(false /* concurrent */); |
|
1656
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parents:
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|
1490 |
| 3766 | 1491 _hrs.verify_optional(); |
| 2152 | 1492 verify_region_sets_optional(); |
| 1493 | |
|
4872
aa3d708d67c4
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|
1494 print_heap_after_gc(); |
|
3980
8229bd737950
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diff
changeset
|
1495 g1mm()->update_sizes(); |
|
3869
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|
1496 post_full_gc_dump(); |
| 1973 | 1497 |
| 1498 return true; | |
| 342 | 1499 } |
| 1500 | |
| 1501 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
| 1973 | 1502 // do_collection() will return whether it succeeded in performing |
| 1503 // the GC. Currently, there is no facility on the | |
| 1504 // do_full_collection() API to notify the caller than the collection | |
| 1505 // did not succeed (e.g., because it was locked out by the GC | |
| 1506 // locker). So, right now, we'll ignore the return value. | |
| 1507 bool dummy = do_collection(true, /* explicit_gc */ | |
| 1508 clear_all_soft_refs, | |
| 1509 0 /* word_size */); | |
| 342 | 1510 } |
| 1511 | |
| 1512 // This code is mostly copied from TenuredGeneration. | |
| 1513 void | |
| 1514 G1CollectedHeap:: | |
| 1515 resize_if_necessary_after_full_collection(size_t word_size) { | |
| 1516 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
| 1517 | |
| 1518 // Include the current allocation, if any, and bytes that will be | |
| 1519 // pre-allocated to support collections, as "used". | |
| 1520 const size_t used_after_gc = used(); | |
| 1521 const size_t capacity_after_gc = capacity(); | |
| 1522 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
| 1523 | |
|
1717
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|
1524 // This is enforced in arguments.cpp. |
|
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|
1525 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
|
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|
1526 "otherwise the code below doesn't make sense"); |
|
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|
1527 |
| 342 | 1528 // We don't have floating point command-line arguments |
|
1717
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|
1529 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
| 342 | 1530 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
|
1717
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|
1531 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
| 342 | 1532 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
| 1533 | |
|
1717
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|
1534 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
|
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|
1535 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
|
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|
1536 |
|
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|
1537 // We have to be careful here as these two calculations can overflow |
|
688c3755d7af
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|
1538 // 32-bit size_t's. |
|
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|
1539 double used_after_gc_d = (double) used_after_gc; |
|
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|
1540 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
|
688c3755d7af
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|
1541 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
|
688c3755d7af
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|
1542 |
|
688c3755d7af
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|
1543 // Let's make sure that they are both under the max heap size, which |
|
688c3755d7af
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|
1544 // by default will make them fit into a size_t. |
|
688c3755d7af
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|
1545 double desired_capacity_upper_bound = (double) max_heap_size; |
|
688c3755d7af
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|
1546 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
|
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|
1547 desired_capacity_upper_bound); |
|
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|
1548 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
|
688c3755d7af
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|
1549 desired_capacity_upper_bound); |
|
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|
1550 |
|
688c3755d7af
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|
1551 // We can now safely turn them into size_t's. |
|
688c3755d7af
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|
1552 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
|
688c3755d7af
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|
1553 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
|
688c3755d7af
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|
1554 |
|
688c3755d7af
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|
1555 // This assert only makes sense here, before we adjust them |
|
688c3755d7af
6959014: G1: assert(minimum_desired_capacity <= maximum_desired_capacity) failed: sanity check
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changeset
|
1556 // with respect to the min and max heap size. |
|
688c3755d7af
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changeset
|
1557 assert(minimum_desired_capacity <= maximum_desired_capacity, |
|
688c3755d7af
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changeset
|
1558 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
|
688c3755d7af
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changeset
|
1559 "maximum_desired_capacity = "SIZE_FORMAT, |
|
688c3755d7af
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|
1560 minimum_desired_capacity, maximum_desired_capacity)); |
|
688c3755d7af
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|
1561 |
|
688c3755d7af
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changeset
|
1562 // Should not be greater than the heap max size. No need to adjust |
|
688c3755d7af
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|
1563 // it with respect to the heap min size as it's a lower bound (i.e., |
|
688c3755d7af
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|
1564 // we'll try to make the capacity larger than it, not smaller). |
|
688c3755d7af
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|
1565 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
|
688c3755d7af
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|
1566 // Should not be less than the heap min size. No need to adjust it |
|
688c3755d7af
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|
1567 // with respect to the heap max size as it's an upper bound (i.e., |
|
688c3755d7af
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|
1568 // we'll try to make the capacity smaller than it, not greater). |
|
688c3755d7af
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|
1569 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
| 342 | 1570 |
|
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1571 if (capacity_after_gc < minimum_desired_capacity) { |
| 342 | 1572 // Don't expand unless it's significant |
| 1573 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
|
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1574 ergo_verbose4(ErgoHeapSizing, |
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1575 "attempt heap expansion", |
|
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1576 ergo_format_reason("capacity lower than " |
|
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1577 "min desired capacity after Full GC") |
|
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1578 ergo_format_byte("capacity") |
|
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1579 ergo_format_byte("occupancy") |
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1580 ergo_format_byte_perc("min desired capacity"), |
|
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1581 capacity_after_gc, used_after_gc, |
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1582 minimum_desired_capacity, (double) MinHeapFreeRatio); |
|
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1583 expand(expand_bytes); |
| 342 | 1584 |
| 1585 // No expansion, now see if we want to shrink | |
|
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1586 } else if (capacity_after_gc > maximum_desired_capacity) { |
| 342 | 1587 // Capacity too large, compute shrinking size |
| 1588 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
|
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1589 ergo_verbose4(ErgoHeapSizing, |
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1590 "attempt heap shrinking", |
|
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1591 ergo_format_reason("capacity higher than " |
|
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1592 "max desired capacity after Full GC") |
|
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1593 ergo_format_byte("capacity") |
|
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1594 ergo_format_byte("occupancy") |
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1595 ergo_format_byte_perc("max desired capacity"), |
|
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1596 capacity_after_gc, used_after_gc, |
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1597 maximum_desired_capacity, (double) MaxHeapFreeRatio); |
| 342 | 1598 shrink(shrink_bytes); |
| 1599 } | |
| 1600 } | |
| 1601 | |
| 1602 | |
| 1603 HeapWord* | |
| 1973 | 1604 G1CollectedHeap::satisfy_failed_allocation(size_t word_size, |
| 1605 bool* succeeded) { | |
| 2152 | 1606 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1973 | 1607 |
| 1608 *succeeded = true; | |
| 1609 // Let's attempt the allocation first. | |
|
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1610 HeapWord* result = |
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1611 attempt_allocation_at_safepoint(word_size, |
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1612 false /* expect_null_mutator_alloc_region */); |
| 1973 | 1613 if (result != NULL) { |
| 1614 assert(*succeeded, "sanity"); | |
| 1615 return result; | |
| 1616 } | |
| 342 | 1617 |
| 1618 // In a G1 heap, we're supposed to keep allocation from failing by | |
| 1619 // incremental pauses. Therefore, at least for now, we'll favor | |
| 1620 // expansion over collection. (This might change in the future if we can | |
| 1621 // do something smarter than full collection to satisfy a failed alloc.) | |
| 1622 result = expand_and_allocate(word_size); | |
| 1623 if (result != NULL) { | |
| 1973 | 1624 assert(*succeeded, "sanity"); |
| 342 | 1625 return result; |
| 1626 } | |
| 1627 | |
| 1973 | 1628 // Expansion didn't work, we'll try to do a Full GC. |
| 1629 bool gc_succeeded = do_collection(false, /* explicit_gc */ | |
| 1630 false, /* clear_all_soft_refs */ | |
| 1631 word_size); | |
| 1632 if (!gc_succeeded) { | |
| 1633 *succeeded = false; | |
| 1634 return NULL; | |
| 1635 } | |
| 1636 | |
| 1637 // Retry the allocation | |
| 1638 result = attempt_allocation_at_safepoint(word_size, | |
|
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1639 true /* expect_null_mutator_alloc_region */); |
| 342 | 1640 if (result != NULL) { |
| 1973 | 1641 assert(*succeeded, "sanity"); |
| 342 | 1642 return result; |
| 1643 } | |
| 1644 | |
| 1973 | 1645 // Then, try a Full GC that will collect all soft references. |
| 1646 gc_succeeded = do_collection(false, /* explicit_gc */ | |
| 1647 true, /* clear_all_soft_refs */ | |
| 1648 word_size); | |
| 1649 if (!gc_succeeded) { | |
| 1650 *succeeded = false; | |
| 1651 return NULL; | |
| 1652 } | |
| 1653 | |
| 1654 // Retry the allocation once more | |
| 1655 result = attempt_allocation_at_safepoint(word_size, | |
|
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1656 true /* expect_null_mutator_alloc_region */); |
| 342 | 1657 if (result != NULL) { |
| 1973 | 1658 assert(*succeeded, "sanity"); |
| 342 | 1659 return result; |
| 1660 } | |
| 1661 | |
|
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1662 assert(!collector_policy()->should_clear_all_soft_refs(), |
| 1973 | 1663 "Flag should have been handled and cleared prior to this point"); |
|
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1664 |
| 342 | 1665 // What else? We might try synchronous finalization later. If the total |
| 1666 // space available is large enough for the allocation, then a more | |
| 1667 // complete compaction phase than we've tried so far might be | |
| 1668 // appropriate. | |
| 1973 | 1669 assert(*succeeded, "sanity"); |
| 342 | 1670 return NULL; |
| 1671 } | |
| 1672 | |
| 1673 // Attempting to expand the heap sufficiently | |
| 1674 // to support an allocation of the given "word_size". If | |
| 1675 // successful, perform the allocation and return the address of the | |
| 1676 // allocated block, or else "NULL". | |
| 1677 | |
| 1678 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
| 2152 | 1679 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1680 | |
| 1681 verify_region_sets_optional(); | |
| 1973 | 1682 |
|
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1683 size_t expand_bytes = MAX2(word_size * HeapWordSize, MinHeapDeltaBytes); |
|
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1684 ergo_verbose1(ErgoHeapSizing, |
|
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1685 "attempt heap expansion", |
|
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|
1686 ergo_format_reason("allocation request failed") |
|
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|
1687 ergo_format_byte("allocation request"), |
|
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|
1688 word_size * HeapWordSize); |
|
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1689 if (expand(expand_bytes)) { |
| 3766 | 1690 _hrs.verify_optional(); |
|
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1691 verify_region_sets_optional(); |
|
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1692 return attempt_allocation_at_safepoint(word_size, |
|
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1693 false /* expect_null_mutator_alloc_region */); |
|
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1694 } |
|
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|
1695 return NULL; |
| 342 | 1696 } |
| 1697 | |
| 3766 | 1698 void G1CollectedHeap::update_committed_space(HeapWord* old_end, |
| 1699 HeapWord* new_end) { | |
| 1700 assert(old_end != new_end, "don't call this otherwise"); | |
| 1701 assert((HeapWord*) _g1_storage.high() == new_end, "invariant"); | |
| 1702 | |
| 1703 // Update the committed mem region. | |
| 1704 _g1_committed.set_end(new_end); | |
| 1705 // Tell the card table about the update. | |
| 1706 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
| 1707 // Tell the BOT about the update. | |
| 1708 _bot_shared->resize(_g1_committed.word_size()); | |
| 1709 } | |
| 1710 | |
|
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1711 bool G1CollectedHeap::expand(size_t expand_bytes) { |
| 342 | 1712 size_t old_mem_size = _g1_storage.committed_size(); |
|
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1713 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
| 342 | 1714 aligned_expand_bytes = align_size_up(aligned_expand_bytes, |
| 1715 HeapRegion::GrainBytes); | |
|
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1716 ergo_verbose2(ErgoHeapSizing, |
|
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1717 "expand the heap", |
|
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|
1718 ergo_format_byte("requested expansion amount") |
|
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|
1719 ergo_format_byte("attempted expansion amount"), |
|
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|
1720 expand_bytes, aligned_expand_bytes); |
|
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|
1721 |
| 3766 | 1722 // First commit the memory. |
| 1723 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
|
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1724 bool successful = _g1_storage.expand_by(aligned_expand_bytes); |
|
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|
1725 if (successful) { |
| 3766 | 1726 // Then propagate this update to the necessary data structures. |
| 1727 HeapWord* new_end = (HeapWord*) _g1_storage.high(); | |
| 1728 update_committed_space(old_end, new_end); | |
| 1729 | |
| 1730 FreeRegionList expansion_list("Local Expansion List"); | |
| 1731 MemRegion mr = _hrs.expand_by(old_end, new_end, &expansion_list); | |
| 1732 assert(mr.start() == old_end, "post-condition"); | |
| 1733 // mr might be a smaller region than what was requested if | |
| 1734 // expand_by() was unable to allocate the HeapRegion instances | |
| 1735 assert(mr.end() <= new_end, "post-condition"); | |
| 1736 | |
| 1737 size_t actual_expand_bytes = mr.byte_size(); | |
| 1738 assert(actual_expand_bytes <= aligned_expand_bytes, "post-condition"); | |
| 1739 assert(actual_expand_bytes == expansion_list.total_capacity_bytes(), | |
| 1740 "post-condition"); | |
| 1741 if (actual_expand_bytes < aligned_expand_bytes) { | |
| 1742 // We could not expand _hrs to the desired size. In this case we | |
| 1743 // need to shrink the committed space accordingly. | |
| 1744 assert(mr.end() < new_end, "invariant"); | |
| 1745 | |
| 1746 size_t diff_bytes = aligned_expand_bytes - actual_expand_bytes; | |
| 1747 // First uncommit the memory. | |
| 1748 _g1_storage.shrink_by(diff_bytes); | |
| 1749 // Then propagate this update to the necessary data structures. | |
| 1750 update_committed_space(new_end, mr.end()); | |
|
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|
1751 } |
| 3766 | 1752 _free_list.add_as_tail(&expansion_list); |
|
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1753 |
|
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1754 if (_hr_printer.is_active()) { |
|
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1755 HeapWord* curr = mr.start(); |
|
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1756 while (curr < mr.end()) { |
|
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|
1757 HeapWord* curr_end = curr + HeapRegion::GrainWords; |
|
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1758 _hr_printer.commit(curr, curr_end); |
|
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1759 curr = curr_end; |
|
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|
1760 } |
|
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1761 assert(curr == mr.end(), "post-condition"); |
|
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|
1762 } |
|
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1763 g1_policy()->record_new_heap_size(n_regions()); |
|
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1764 } else { |
|
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1765 ergo_verbose0(ErgoHeapSizing, |
|
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1766 "did not expand the heap", |
|
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|
1767 ergo_format_reason("heap expansion operation failed")); |
|
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1768 // The expansion of the virtual storage space was unsuccessful. |
|
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1769 // Let's see if it was because we ran out of swap. |
|
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1770 if (G1ExitOnExpansionFailure && |
|
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1771 _g1_storage.uncommitted_size() >= aligned_expand_bytes) { |
|
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1772 // We had head room... |
|
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1773 vm_exit_out_of_memory(aligned_expand_bytes, "G1 heap expansion"); |
| 342 | 1774 } |
| 1775 } | |
|
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1776 return successful; |
| 342 | 1777 } |
| 1778 | |
| 3766 | 1779 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) { |
| 342 | 1780 size_t old_mem_size = _g1_storage.committed_size(); |
| 1781 size_t aligned_shrink_bytes = | |
| 1782 ReservedSpace::page_align_size_down(shrink_bytes); | |
| 1783 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
| 1784 HeapRegion::GrainBytes); | |
| 1785 size_t num_regions_deleted = 0; | |
| 3766 | 1786 MemRegion mr = _hrs.shrink_by(aligned_shrink_bytes, &num_regions_deleted); |
| 1787 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
| 1788 assert(mr.end() == old_end, "post-condition"); | |
|
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1789 |
|
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|
1790 ergo_verbose3(ErgoHeapSizing, |
|
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1791 "shrink the heap", |
|
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|
1792 ergo_format_byte("requested shrinking amount") |
|
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|
1793 ergo_format_byte("aligned shrinking amount") |
|
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1794 ergo_format_byte("attempted shrinking amount"), |
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1795 shrink_bytes, aligned_shrink_bytes, mr.byte_size()); |
| 3766 | 1796 if (mr.byte_size() > 0) { |
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1797 if (_hr_printer.is_active()) { |
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1798 HeapWord* curr = mr.end(); |
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1799 while (curr > mr.start()) { |
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1800 HeapWord* curr_end = curr; |
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1801 curr -= HeapRegion::GrainWords; |
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1802 _hr_printer.uncommit(curr, curr_end); |
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1803 } |
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1804 assert(curr == mr.start(), "post-condition"); |
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1805 } |
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1806 |
| 342 | 1807 _g1_storage.shrink_by(mr.byte_size()); |
| 3766 | 1808 HeapWord* new_end = (HeapWord*) _g1_storage.high(); |
| 1809 assert(mr.start() == new_end, "post-condition"); | |
| 1810 | |
| 1811 _expansion_regions += num_regions_deleted; | |
| 1812 update_committed_space(old_end, new_end); | |
| 1813 HeapRegionRemSet::shrink_heap(n_regions()); | |
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1814 g1_policy()->record_new_heap_size(n_regions()); |
|
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1815 } else { |
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1816 ergo_verbose0(ErgoHeapSizing, |
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1817 "did not shrink the heap", |
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1818 ergo_format_reason("heap shrinking operation failed")); |
| 342 | 1819 } |
| 1820 } | |
| 1821 | |
| 1822 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
| 2152 | 1823 verify_region_sets_optional(); |
| 1824 | |
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1825 // We should only reach here at the end of a Full GC which means we |
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1826 // should not not be holding to any GC alloc regions. The method |
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1827 // below will make sure of that and do any remaining clean up. |
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1828 abandon_gc_alloc_regions(); |
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1829 |
| 2152 | 1830 // Instead of tearing down / rebuilding the free lists here, we |
| 1831 // could instead use the remove_all_pending() method on free_list to | |
| 1832 // remove only the ones that we need to remove. | |
| 4072 | 1833 tear_down_region_sets(true /* free_list_only */); |
| 342 | 1834 shrink_helper(shrink_bytes); |
| 4072 | 1835 rebuild_region_sets(true /* free_list_only */); |
| 2152 | 1836 |
| 3766 | 1837 _hrs.verify_optional(); |
| 2152 | 1838 verify_region_sets_optional(); |
| 342 | 1839 } |
| 1840 | |
| 1841 // Public methods. | |
| 1842 | |
| 1843 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 1844 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 1845 #endif // _MSC_VER | |
| 1846 | |
| 1847 | |
| 1848 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
| 1849 SharedHeap(policy_), | |
| 1850 _g1_policy(policy_), | |
| 1111 | 1851 _dirty_card_queue_set(false), |
| 1705 | 1852 _into_cset_dirty_card_queue_set(false), |
|
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1853 _is_alive_closure_cm(this), |
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1854 _is_alive_closure_stw(this), |
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1855 _ref_processor_cm(NULL), |
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1856 _ref_processor_stw(NULL), |
| 342 | 1857 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), |
| 1858 _bot_shared(NULL), | |
| 1859 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
| 1860 _evac_failure_scan_stack(NULL) , | |
| 1861 _mark_in_progress(false), | |
| 2152 | 1862 _cg1r(NULL), _summary_bytes_used(0), |
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1863 _g1mm(NULL), |
| 342 | 1864 _refine_cte_cl(NULL), |
| 1865 _full_collection(false), | |
| 2152 | 1866 _free_list("Master Free List"), |
| 1867 _secondary_free_list("Secondary Free List"), | |
| 4072 | 1868 _old_set("Old Set"), |
| 2152 | 1869 _humongous_set("Master Humongous Set"), |
| 1870 _free_regions_coming(false), | |
| 342 | 1871 _young_list(new YoungList(this)), |
| 1872 _gc_time_stamp(0), | |
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1873 _retained_old_gc_alloc_region(NULL), |
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1874 _expand_heap_after_alloc_failure(true), |
| 526 | 1875 _surviving_young_words(NULL), |
|
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1876 _full_collections_completed(0), |
| 526 | 1877 _in_cset_fast_test(NULL), |
|
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1878 _in_cset_fast_test_base(NULL), |
|
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1879 _dirty_cards_region_list(NULL), |
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1880 _worker_cset_start_region(NULL), |
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1881 _worker_cset_start_region_time_stamp(NULL) { |
| 342 | 1882 _g1h = this; // To catch bugs. |
| 1883 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
| 1884 vm_exit_during_initialization("Failed necessary allocation."); | |
| 1885 } | |
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1886 |
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1887 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1888 |
| 342 | 1889 int n_queues = MAX2((int)ParallelGCThreads, 1); |
| 1890 _task_queues = new RefToScanQueueSet(n_queues); | |
| 1891 | |
| 1892 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
| 1893 assert(n_rem_sets > 0, "Invariant."); | |
| 1894 | |
| 1895 HeapRegionRemSetIterator** iter_arr = | |
| 1896 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
| 1897 for (int i = 0; i < n_queues; i++) { | |
| 1898 iter_arr[i] = new HeapRegionRemSetIterator(); | |
| 1899 } | |
| 1900 _rem_set_iterator = iter_arr; | |
| 1901 | |
|
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1902 _worker_cset_start_region = NEW_C_HEAP_ARRAY(HeapRegion*, n_queues); |
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1903 _worker_cset_start_region_time_stamp = NEW_C_HEAP_ARRAY(unsigned int, n_queues); |
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1904 |
| 342 | 1905 for (int i = 0; i < n_queues; i++) { |
| 1906 RefToScanQueue* q = new RefToScanQueue(); | |
| 1907 q->initialize(); | |
| 1908 _task_queues->register_queue(i, q); | |
| 1909 } | |
| 1910 | |
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1911 clear_cset_start_regions(); |
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1912 |
| 342 | 1913 guarantee(_task_queues != NULL, "task_queues allocation failure."); |
| 1914 } | |
| 1915 | |
| 1916 jint G1CollectedHeap::initialize() { | |
| 1166 | 1917 CollectedHeap::pre_initialize(); |
| 342 | 1918 os::enable_vtime(); |
| 1919 | |
| 1920 // Necessary to satisfy locking discipline assertions. | |
| 1921 | |
| 1922 MutexLocker x(Heap_lock); | |
| 1923 | |
|
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1924 // We have to initialize the printer before committing the heap, as |
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1925 // it will be used then. |
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1926 _hr_printer.set_active(G1PrintHeapRegions); |
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1927 |
| 342 | 1928 // While there are no constraints in the GC code that HeapWordSize |
| 1929 // be any particular value, there are multiple other areas in the | |
| 1930 // system which believe this to be true (e.g. oop->object_size in some | |
| 1931 // cases incorrectly returns the size in wordSize units rather than | |
| 1932 // HeapWordSize). | |
| 1933 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
| 1934 | |
| 1935 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
| 1936 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
| 1937 | |
| 1938 // Ensure that the sizes are properly aligned. | |
| 1939 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1940 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1941 | |
| 1942 _cg1r = new ConcurrentG1Refine(); | |
| 1943 | |
| 1944 // Reserve the maximum. | |
| 1945 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
| 1946 // Includes the perm-gen. | |
|
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1947 |
|
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1948 // When compressed oops are enabled, the preferred heap base |
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1949 // is calculated by subtracting the requested size from the |
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1950 // 32Gb boundary and using the result as the base address for |
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1951 // heap reservation. If the requested size is not aligned to |
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1952 // HeapRegion::GrainBytes (i.e. the alignment that is passed |
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1953 // into the ReservedHeapSpace constructor) then the actual |
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1954 // base of the reserved heap may end up differing from the |
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1955 // address that was requested (i.e. the preferred heap base). |
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1956 // If this happens then we could end up using a non-optimal |
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1957 // compressed oops mode. |
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1958 |
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1959 // Since max_byte_size is aligned to the size of a heap region (checked |
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1960 // above), we also need to align the perm gen size as it might not be. |
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1961 const size_t total_reserved = max_byte_size + |
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1962 align_size_up(pgs->max_size(), HeapRegion::GrainBytes); |
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1963 Universe::check_alignment(total_reserved, HeapRegion::GrainBytes, "g1 heap and perm"); |
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1964 |
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1965 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1966 |
|
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1967 ReservedHeapSpace heap_rs(total_reserved, HeapRegion::GrainBytes, |
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1968 UseLargePages, addr); |
|
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1969 |
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1970 if (UseCompressedOops) { |
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1971 if (addr != NULL && !heap_rs.is_reserved()) { |
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1972 // Failed to reserve at specified address - the requested memory |
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1973 // region is taken already, for example, by 'java' launcher. |
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1974 // Try again to reserver heap higher. |
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1975 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
|
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1976 |
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1977 ReservedHeapSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1978 UseLargePages, addr); |
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1979 |
|
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1980 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1981 // Failed to reserve at specified address again - give up. |
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1982 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1983 assert(addr == NULL, ""); |
|
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1984 |
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1985 ReservedHeapSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
|
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1986 UseLargePages, addr); |
|
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1987 heap_rs = heap_rs1; |
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diff
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|
1988 } else { |
|
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
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|
1989 heap_rs = heap_rs0; |
|
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
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|
1990 } |
|
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
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diff
changeset
|
1991 } |
|
660978a2a31a
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diff
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|
1992 } |
| 342 | 1993 |
| 1994 if (!heap_rs.is_reserved()) { | |
| 1995 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
| 1996 return JNI_ENOMEM; | |
| 1997 } | |
| 1998 | |
| 1999 // It is important to do this in a way such that concurrent readers can't | |
| 2000 // temporarily think somethings in the heap. (I've actually seen this | |
| 2001 // happen in asserts: DLD.) | |
| 2002 _reserved.set_word_size(0); | |
| 2003 _reserved.set_start((HeapWord*)heap_rs.base()); | |
| 2004 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 2005 | |
| 2006 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
| 2007 | |
| 2008 // Create the gen rem set (and barrier set) for the entire reserved region. | |
| 2009 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
| 2010 set_barrier_set(rem_set()->bs()); | |
| 2011 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
| 2012 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
| 2013 } else { | |
| 2014 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
| 2015 return JNI_ENOMEM; | |
| 2016 } | |
| 2017 | |
| 2018 // Also create a G1 rem set. | |
| 1861 | 2019 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { |
| 2020 _g1_rem_set = new G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
| 342 | 2021 } else { |
| 1861 | 2022 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); |
| 2023 return JNI_ENOMEM; | |
| 342 | 2024 } |
| 2025 | |
| 2026 // Carve out the G1 part of the heap. | |
| 2027 | |
| 2028 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
| 2029 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
| 2030 g1_rs.size()/HeapWordSize); | |
| 2031 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
| 2032 | |
| 2033 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
| 2034 | |
| 2035 _g1_storage.initialize(g1_rs, 0); | |
| 2036 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
| 3766 | 2037 _hrs.initialize((HeapWord*) _g1_reserved.start(), |
| 2038 (HeapWord*) _g1_reserved.end(), | |
| 2039 _expansion_regions); | |
| 342 | 2040 |
|
807
d44bdab1c03d
6843694: G1: assert(index < _vs.committed_size(),"bad index"), g1BlockOffsetTable.inline.hpp:55
johnc
parents:
796
diff
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|
2041 // 6843694 - ensure that the maximum region index can fit |
|
d44bdab1c03d
6843694: G1: assert(index < _vs.committed_size(),"bad index"), g1BlockOffsetTable.inline.hpp:55
johnc
parents:
796
diff
changeset
|
2042 // in the remembered set structures. |
|
d44bdab1c03d
6843694: G1: assert(index < _vs.committed_size(),"bad index"), g1BlockOffsetTable.inline.hpp:55
johnc
parents:
796
diff
changeset
|
2043 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
|
d44bdab1c03d
6843694: G1: assert(index < _vs.committed_size(),"bad index"), g1BlockOffsetTable.inline.hpp:55
johnc
parents:
796
diff
changeset
|
2044 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
|
d44bdab1c03d
6843694: G1: assert(index < _vs.committed_size(),"bad index"), g1BlockOffsetTable.inline.hpp:55
johnc
parents:
796
diff
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|
2045 |
|
d44bdab1c03d
6843694: G1: assert(index < _vs.committed_size(),"bad index"), g1BlockOffsetTable.inline.hpp:55
johnc
parents:
796
diff
changeset
|
2046 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
|
942
2c79770d1f6e
6819085: G1: use larger and/or user settable region size
tonyp
parents:
941
diff
changeset
|
2047 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3983
diff
changeset
|
2048 guarantee(HeapRegion::CardsPerRegion < max_cards_per_region, |
|
942
2c79770d1f6e
6819085: G1: use larger and/or user settable region size
tonyp
parents:
941
diff
changeset
|
2049 "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
|
2050 |
| 2152 | 2051 HeapRegionSet::set_unrealistically_long_length(max_regions() + 1); |
| 2052 | |
| 342 | 2053 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
| 2054 heap_word_size(init_byte_size)); | |
| 2055 | |
| 2056 _g1h = this; | |
| 2057 | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2058 _in_cset_fast_test_length = max_regions(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2059 _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
johnc
parents:
1391
diff
changeset
|
2060 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2061 // 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
|
2062 // 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
|
2063 // 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
|
2064 _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
|
2065 ((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
|
2066 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2067 // 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
|
2068 // regions to the incremental collection set for the first |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2069 // evacuation pause. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2070 clear_cset_fast_test(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2071 |
| 342 | 2072 // Create the ConcurrentMark data structure and thread. |
| 2073 // (Must do this late, so that "max_regions" is defined.) | |
| 2074 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
| 2075 _cmThread = _cm->cmThread(); | |
| 2076 | |
| 2077 // Initialize the from_card cache structure of HeapRegionRemSet. | |
| 2078 HeapRegionRemSet::init_heap(max_regions()); | |
| 2079 | |
| 677 | 2080 // Now expand into the initial heap size. |
|
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
2081 if (!expand(init_byte_size)) { |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
2082 vm_exit_during_initialization("Failed to allocate initial heap."); |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
2083 return JNI_ENOMEM; |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
2084 } |
| 342 | 2085 |
| 2086 // Perform any initialization actions delegated to the policy. | |
| 2087 g1_policy()->init(); | |
| 2088 | |
| 2089 _refine_cte_cl = | |
| 2090 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
| 2091 g1_rem_set(), | |
| 2092 concurrent_g1_refine()); | |
| 2093 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 2094 | |
| 2095 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
| 2096 SATB_Q_FL_lock, | |
| 1111 | 2097 G1SATBProcessCompletedThreshold, |
| 342 | 2098 Shared_SATB_Q_lock); |
| 794 | 2099 |
| 2100 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
| 2101 DirtyCardQ_FL_lock, | |
| 1111 | 2102 concurrent_g1_refine()->yellow_zone(), |
| 2103 concurrent_g1_refine()->red_zone(), | |
| 794 | 2104 Shared_DirtyCardQ_lock); |
| 2105 | |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
2106 if (G1DeferredRSUpdate) { |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
2107 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
2108 DirtyCardQ_FL_lock, |
| 1111 | 2109 -1, // never trigger processing |
| 2110 -1, // no limit on length | |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
2111 Shared_DirtyCardQ_lock, |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
2112 &JavaThread::dirty_card_queue_set()); |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
2113 } |
| 1705 | 2114 |
| 2115 // Initialize the card queue set used to hold cards containing | |
| 2116 // references into the collection set. | |
| 2117 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
| 2118 DirtyCardQ_FL_lock, | |
| 2119 -1, // never trigger processing | |
| 2120 -1, // no limit on length | |
| 2121 Shared_DirtyCardQ_lock, | |
| 2122 &JavaThread::dirty_card_queue_set()); | |
| 2123 | |
| 342 | 2124 // In case we're keeping closure specialization stats, initialize those |
| 2125 // counts and that mechanism. | |
| 2126 SpecializationStats::clear(); | |
| 2127 | |
| 2128 // Do later initialization work for concurrent refinement. | |
| 2129 _cg1r->init(); | |
| 2130 | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2131 // 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
|
2132 // 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
|
2133 // space here, lots of asserts fire. |
| 3766 | 2134 |
| 2135 HeapRegion* dummy_region = new_heap_region(0 /* index of bottom region */, | |
| 2136 _g1_reserved.start()); | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2137 // 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
|
2138 // 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
|
2139 // 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
|
2140 // 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
|
2141 dummy_region->set_young(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2142 // Make sure it's full. |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2143 dummy_region->set_top(dummy_region->end()); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2144 G1AllocRegion::setup(this, dummy_region); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2145 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2146 init_mutator_alloc_region(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2147 |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
2148 // 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
|
2149 // values in the heap have been properly initialized. |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
2150 _g1mm = new G1MonitoringSupport(this); |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
2151 |
| 342 | 2152 return JNI_OK; |
| 2153 } | |
| 2154 | |
| 2155 void G1CollectedHeap::ref_processing_init() { | |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2156 // Reference processing in G1 currently works as follows: |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2157 // |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2158 // * There are two reference processor instances. One is |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2159 // used to record and process discovered references |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2160 // during concurrent marking; the other is used to |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2161 // record and process references during STW pauses |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2162 // (both full and incremental). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2163 // * Both ref processors need to 'span' the entire heap as |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2164 // the regions in the collection set may be dotted around. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2165 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2166 // * For the concurrent marking ref processor: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2167 // * Reference discovery is enabled at initial marking. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2168 // * Reference discovery is disabled and the discovered |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2169 // references processed etc during remarking. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2170 // * Reference discovery is MT (see below). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2171 // * Reference discovery requires a barrier (see below). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2172 // * Reference processing may or may not be MT |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2173 // (depending on the value of ParallelRefProcEnabled |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2174 // and ParallelGCThreads). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2175 // * A full GC disables reference discovery by the CM |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2176 // ref processor and abandons any entries on it's |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2177 // discovered lists. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2178 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2179 // * For the STW processor: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2180 // * 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
|
2181 // * Processing and enqueueing during a full GC is non-MT. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2182 // * During a full GC, references are processed after marking. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2183 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2184 // * 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
|
2185 // of an incremental evacuation pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2186 // * References are processed near the end of a STW evacuation pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2187 // * For both types of GC: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2188 // * Discovery is atomic - i.e. not concurrent. |
|
4dfb2df418f2
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|
2189 // * Reference discovery will not need a barrier. |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
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1973
diff
changeset
|
2190 |
| 342 | 2191 SharedHeap::ref_processing_init(); |
| 2192 MemRegion mr = reserved_region(); | |
|
3979
4dfb2df418f2
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|
2193 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
2194 // Concurrent Mark ref processor |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
2195 _ref_processor_cm = |
|
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
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2361
diff
changeset
|
2196 new ReferenceProcessor(mr, // span |
|
3979
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|
2197 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
2198 // mt processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
2199 (int) ParallelGCThreads, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
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|
2200 // degree of mt processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
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|
2201 (ParallelGCThreads > 1) || (ConcGCThreads > 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
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|
2202 // mt discovery |
|
4dfb2df418f2
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|
2203 (int) MAX2(ParallelGCThreads, ConcGCThreads), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2204 // degree of mt discovery |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
2205 false, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
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3973
diff
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|
2206 // Reference discovery is not atomic |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
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|
2207 &_is_alive_closure_cm, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2208 // is alive closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
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|
2209 // (for efficiency/performance) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
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|
2210 true); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2211 // Setting next fields of discovered |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2212 // lists requires a barrier. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2213 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2214 // STW ref processor |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2215 _ref_processor_stw = |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2216 new ReferenceProcessor(mr, // span |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2217 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2218 // mt processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
2219 MAX2((int)ParallelGCThreads, 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2220 // degree of mt processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2221 (ParallelGCThreads > 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2222 // mt discovery |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
2223 MAX2((int)ParallelGCThreads, 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2224 // degree of mt discovery |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2225 true, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2226 // Reference discovery is atomic |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2227 &_is_alive_closure_stw, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2228 // is alive closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2229 // (for efficiency/performance) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2230 false); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2231 // Setting next fields of discovered |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
2232 // lists requires a barrier. |
| 342 | 2233 } |
| 2234 | |
| 2235 size_t G1CollectedHeap::capacity() const { | |
| 2236 return _g1_committed.byte_size(); | |
| 2237 } | |
| 2238 | |
| 1705 | 2239 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
| 2240 DirtyCardQueue* into_cset_dcq, | |
| 2241 bool concurrent, | |
| 342 | 2242 int worker_i) { |
| 889 | 2243 // Clean cards in the hot card cache |
| 1705 | 2244 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set(), into_cset_dcq); |
| 889 | 2245 |
| 342 | 2246 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
| 2247 int n_completed_buffers = 0; | |
| 1705 | 2248 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
| 342 | 2249 n_completed_buffers++; |
| 2250 } | |
| 2251 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
| 2252 (double) n_completed_buffers); | |
| 2253 dcqs.clear_n_completed_buffers(); | |
| 2254 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
| 2255 } | |
| 2256 | |
| 2257 | |
| 2258 // Computes the sum of the storage used by the various regions. | |
| 2259 | |
| 2260 size_t G1CollectedHeap::used() const { | |
|
862
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
ysr
parents:
861
diff
changeset
|
2261 assert(Heap_lock->owner() != NULL, |
|
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
ysr
parents:
861
diff
changeset
|
2262 "Should be owned on this thread's behalf."); |
| 342 | 2263 size_t result = _summary_bytes_used; |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2264 // 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
|
2265 HeapRegion* hr = _mutator_alloc_region.get(); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2266 if (hr != NULL) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2267 result += hr->used(); |
| 342 | 2268 return result; |
| 2269 } | |
| 2270 | |
|
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2271 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
|
2272 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
|
2273 return result; |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2274 } |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2275 |
| 342 | 2276 class SumUsedClosure: public HeapRegionClosure { |
| 2277 size_t _used; | |
| 2278 public: | |
| 2279 SumUsedClosure() : _used(0) {} | |
| 2280 bool doHeapRegion(HeapRegion* r) { | |
| 2281 if (!r->continuesHumongous()) { | |
| 2282 _used += r->used(); | |
| 2283 } | |
| 2284 return false; | |
| 2285 } | |
| 2286 size_t result() { return _used; } | |
| 2287 }; | |
| 2288 | |
| 2289 size_t G1CollectedHeap::recalculate_used() const { | |
| 2290 SumUsedClosure blk; | |
| 3766 | 2291 heap_region_iterate(&blk); |
| 342 | 2292 return blk.result(); |
| 2293 } | |
| 2294 | |
| 2295 size_t G1CollectedHeap::unsafe_max_alloc() { | |
| 2152 | 2296 if (free_regions() > 0) return HeapRegion::GrainBytes; |
| 342 | 2297 // otherwise, is there space in the current allocation region? |
| 2298 | |
| 2299 // We need to store the current allocation region in a local variable | |
| 2300 // here. The problem is that this method doesn't take any locks and | |
| 2301 // there may be other threads which overwrite the current allocation | |
| 2302 // region field. attempt_allocation(), for example, sets it to NULL | |
| 2303 // and this can happen *after* the NULL check here but before the call | |
| 2304 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
| 2305 // to be a problem in the optimized build, since the two loads of the | |
| 2306 // current allocation region field are optimized away. | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2307 HeapRegion* hr = _mutator_alloc_region.get(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2308 if (hr == NULL) { |
| 342 | 2309 return 0; |
| 2310 } | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2311 return hr->free(); |
| 342 | 2312 } |
| 2313 | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2314 bool G1CollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { |
|
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2315 switch (cause) { |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2316 case GCCause::_gc_locker: return GCLockerInvokesConcurrent; |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2317 case GCCause::_java_lang_system_gc: return ExplicitGCInvokesConcurrent; |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2318 case GCCause::_g1_humongous_allocation: return true; |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2319 default: return false; |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2320 } |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2321 } |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2322 |
|
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2323 #ifndef PRODUCT |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2324 void G1CollectedHeap::allocate_dummy_regions() { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2325 // Let's fill up most of the region |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2326 size_t word_size = HeapRegion::GrainWords - 1024; |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2327 // 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
|
2328 guarantee(isHumongous(word_size), "sanity"); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2329 |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2330 for (uintx i = 0; i < G1DummyRegionsPerGC; ++i) { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2331 // 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
|
2332 HeapWord* dummy_obj = humongous_obj_allocate(word_size); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2333 if (dummy_obj != NULL) { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2334 MemRegion mr(dummy_obj, word_size); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2335 CollectedHeap::fill_with_object(mr); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2336 } else { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2337 // 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
|
2338 // again. Let's get out of the loop. |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2339 break; |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2340 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2341 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2342 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2343 #endif // !PRODUCT |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2344 |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2345 void G1CollectedHeap::increment_full_collections_completed(bool concurrent) { |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2346 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2347 |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2348 // 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
|
2349 // 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
|
2350 // 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
|
2351 // assert here. |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2352 |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2353 // 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
|
2354 // 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
|
2355 // collections have been started. |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2356 unsigned int full_collections_started = total_full_collections(); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2357 |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2358 // 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
|
2359 // 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
|
2360 // interrupt a concurrent cycle), the number of full collections |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2361 // 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
|
2362 // 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
|
2363 // behind the number of full collections started. |
|
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|
2364 |
|
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|
2365 // 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)
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|
2366 assert(concurrent || |
|
1656
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|
2367 (full_collections_started == _full_collections_completed + 1) || |
|
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|
2368 (full_collections_started == _full_collections_completed + 2), |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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|
2369 err_msg("for inner caller (Full GC): full_collections_started = %u " |
|
1656
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|
2370 "is inconsistent with _full_collections_completed = %u", |
|
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|
2371 full_collections_started, _full_collections_completed)); |
|
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|
2372 |
|
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|
2373 // This is the case for the outer caller, i.e. the concurrent cycle. |
|
2030
fb712ff22571
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|
2374 assert(!concurrent || |
|
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|
2375 (full_collections_started == _full_collections_completed + 1), |
|
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|
2376 err_msg("for outer caller (concurrent cycle): " |
|
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|
2377 "full_collections_started = %u " |
|
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|
2378 "is inconsistent with _full_collections_completed = %u", |
|
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|
2379 full_collections_started, _full_collections_completed)); |
|
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|
2380 |
|
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|
2381 _full_collections_completed += 1; |
|
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|
2382 |
|
1840
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6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
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|
2383 // We need to clear the "in_progress" flag in the CM thread before |
|
4e0094bc41fa
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|
2384 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
|
4e0094bc41fa
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|
2385 // is set) so that if a waiter requests another System.gc() it doesn't |
|
4e0094bc41fa
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|
2386 // incorrectly see that a marking cyle is still in progress. |
|
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|
2387 if (concurrent) { |
|
1840
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|
2388 _cmThread->clear_in_progress(); |
|
4e0094bc41fa
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|
2389 } |
|
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6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
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|
2390 |
|
1656
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|
2391 // This notify_all() will ensure that a thread that called |
|
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|
2392 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
|
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|
2393 // and it's waiting for a full GC to finish will be woken up. It is |
|
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|
2394 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
|
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|
2395 FullGCCount_lock->notify_all(); |
|
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|
2396 } |
|
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|
2397 |
| 342 | 2398 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
| 2152 | 2399 assert_at_safepoint(true /* should_be_vm_thread */); |
| 342 | 2400 GCCauseSetter gcs(this, cause); |
| 2401 switch (cause) { | |
| 2402 case GCCause::_heap_inspection: | |
| 2403 case GCCause::_heap_dump: { | |
| 2404 HandleMark hm; | |
| 2405 do_full_collection(false); // don't clear all soft refs | |
| 2406 break; | |
| 2407 } | |
| 2408 default: // XXX FIX ME | |
| 2409 ShouldNotReachHere(); // Unexpected use of this function | |
| 2410 } | |
| 2411 } | |
| 2412 | |
|
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|
2413 void G1CollectedHeap::collect(GCCause::Cause cause) { |
|
4910
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|
2414 assert_heap_not_locked(); |
|
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|
2415 |
|
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|
2416 unsigned int gc_count_before; |
|
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|
2417 unsigned int full_gc_count_before; |
|
4910
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|
2418 bool retry_gc; |
|
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|
2419 |
|
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|
2420 do { |
|
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|
2421 retry_gc = false; |
|
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|
2422 |
|
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|
2423 { |
|
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|
2424 MutexLocker ml(Heap_lock); |
|
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|
2425 |
|
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|
2426 // Read the GC count while holding the Heap_lock |
|
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|
2427 gc_count_before = total_collections(); |
|
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|
2428 full_gc_count_before = total_full_collections(); |
|
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|
2429 } |
|
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|
2430 |
|
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|
2431 if (should_do_concurrent_full_gc(cause)) { |
|
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|
2432 // Schedule an initial-mark evacuation pause that will start a |
|
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|
2433 // concurrent cycle. We're setting word_size to 0 which means that |
|
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|
2434 // we are not requesting a post-GC allocation. |
|
1656
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|
2435 VM_G1IncCollectionPause op(gc_count_before, |
| 1973 | 2436 0, /* word_size */ |
|
4910
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|
2437 true, /* should_initiate_conc_mark */ |
|
1656
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|
2438 g1_policy()->max_pause_time_ms(), |
|
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|
2439 cause); |
|
5963
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
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diff
changeset
|
2440 |
|
1088
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6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
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|
2441 VMThread::execute(&op); |
|
4910
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|
2442 if (!op.pause_succeeded()) { |
|
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|
2443 if (full_gc_count_before == total_full_collections()) { |
|
5963
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
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|
2444 retry_gc = op.should_retry_gc(); |
|
4910
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|
2445 } else { |
|
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|
2446 // A Full GC happened while we were trying to schedule the |
|
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|
2447 // initial-mark GC. No point in starting a new cycle given |
|
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|
2448 // that the whole heap was collected anyway. |
|
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7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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|
2449 } |
|
5963
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
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changeset
|
2450 |
|
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
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changeset
|
2451 if (retry_gc) { |
|
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
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diff
changeset
|
2452 if (GC_locker::is_active_and_needs_gc()) { |
|
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
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diff
changeset
|
2453 GC_locker::stall_until_clear(); |
|
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents:
4912
diff
changeset
|
2454 } |
|
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
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4912
diff
changeset
|
2455 } |
|
4910
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7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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|
2456 } |
|
1656
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|
2457 } else { |
|
4910
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|
2458 if (cause == GCCause::_gc_locker |
|
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|
2459 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
|
caa4652b4414
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|
2460 |
|
caa4652b4414
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changeset
|
2461 // Schedule a standard evacuation pause. We're setting word_size |
|
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|
2462 // to 0 which means that we are not requesting a post-GC allocation. |
|
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|
2463 VM_G1IncCollectionPause op(gc_count_before, |
|
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|
2464 0, /* word_size */ |
|
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|
2465 false, /* should_initiate_conc_mark */ |
|
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|
2466 g1_policy()->max_pause_time_ms(), |
|
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|
2467 cause); |
|
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|
2468 VMThread::execute(&op); |
|
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|
2469 } else { |
|
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|
2470 // Schedule a Full GC. |
|
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|
2471 VM_G1CollectFull op(gc_count_before, full_gc_count_before, cause); |
|
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|
2472 VMThread::execute(&op); |
|
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|
2473 } |
|
1088
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|
2474 } |
|
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|
2475 } while (retry_gc); |
| 342 | 2476 } |
| 2477 | |
| 2478 bool G1CollectedHeap::is_in(const void* p) const { | |
| 4708 | 2479 if (_g1_committed.contains(p)) { |
| 2480 // Given that we know that p is in the committed space, | |
| 2481 // heap_region_containing_raw() should successfully | |
| 2482 // return the containing region. | |
| 2483 HeapRegion* hr = heap_region_containing_raw(p); | |
| 342 | 2484 return hr->is_in(p); |
| 2485 } else { | |
| 2486 return _perm_gen->as_gen()->is_in(p); | |
| 2487 } | |
| 2488 } | |
| 2489 | |
| 2490 // Iteration functions. | |
| 2491 | |
| 2492 // Iterates an OopClosure over all ref-containing fields of objects | |
| 2493 // within a HeapRegion. | |
| 2494 | |
| 2495 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
| 2496 MemRegion _mr; | |
| 2497 OopClosure* _cl; | |
| 2498 public: | |
| 2499 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
| 2500 : _mr(mr), _cl(cl) {} | |
| 2501 bool doHeapRegion(HeapRegion* r) { | |
| 2502 if (! r->continuesHumongous()) { | |
| 2503 r->oop_iterate(_cl); | |
| 2504 } | |
| 2505 return false; | |
| 2506 } | |
| 2507 }; | |
| 2508 | |
| 678 | 2509 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
| 342 | 2510 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
| 3766 | 2511 heap_region_iterate(&blk); |
| 678 | 2512 if (do_perm) { |
| 2513 perm_gen()->oop_iterate(cl); | |
| 2514 } | |
| 342 | 2515 } |
| 2516 | |
| 678 | 2517 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
| 342 | 2518 IterateOopClosureRegionClosure blk(mr, cl); |
| 3766 | 2519 heap_region_iterate(&blk); |
| 678 | 2520 if (do_perm) { |
| 2521 perm_gen()->oop_iterate(cl); | |
| 2522 } | |
| 342 | 2523 } |
| 2524 | |
| 2525 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
| 2526 | |
| 2527 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
| 2528 ObjectClosure* _cl; | |
| 2529 public: | |
| 2530 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
| 2531 bool doHeapRegion(HeapRegion* r) { | |
| 2532 if (! r->continuesHumongous()) { | |
| 2533 r->object_iterate(_cl); | |
| 2534 } | |
| 2535 return false; | |
| 2536 } | |
| 2537 }; | |
| 2538 | |
| 678 | 2539 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
| 342 | 2540 IterateObjectClosureRegionClosure blk(cl); |
| 3766 | 2541 heap_region_iterate(&blk); |
| 678 | 2542 if (do_perm) { |
| 2543 perm_gen()->object_iterate(cl); | |
| 2544 } | |
| 342 | 2545 } |
| 2546 | |
| 2547 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
| 2548 // FIXME: is this right? | |
| 2549 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
| 2550 } | |
| 2551 | |
| 2552 // Calls a SpaceClosure on a HeapRegion. | |
| 2553 | |
| 2554 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
| 2555 SpaceClosure* _cl; | |
| 2556 public: | |
| 2557 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
| 2558 bool doHeapRegion(HeapRegion* r) { | |
| 2559 _cl->do_space(r); | |
| 2560 return false; | |
| 2561 } | |
| 2562 }; | |
| 2563 | |
| 2564 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
| 2565 SpaceClosureRegionClosure blk(cl); | |
| 3766 | 2566 heap_region_iterate(&blk); |
| 342 | 2567 } |
| 2568 | |
| 3766 | 2569 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const { |
| 2570 _hrs.iterate(cl); | |
| 342 | 2571 } |
| 2572 | |
| 2573 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
| 3766 | 2574 HeapRegionClosure* cl) const { |
| 2575 _hrs.iterate_from(r, cl); | |
| 342 | 2576 } |
| 2577 | |
| 2578 void | |
| 2579 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
|
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2580 uint worker, |
|
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|
2581 uint no_of_par_workers, |
| 342 | 2582 jint claim_value) { |
| 355 | 2583 const size_t regions = n_regions(); |
|
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2584 const uint max_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
|
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|
2585 no_of_par_workers : |
|
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|
2586 1); |
|
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|
2587 assert(UseDynamicNumberOfGCThreads || |
|
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2588 no_of_par_workers == workers()->total_workers(), |
|
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|
2589 "Non dynamic should use fixed number of workers"); |
| 355 | 2590 // try to spread out the starting points of the workers |
|
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2591 const size_t start_index = regions / max_workers * (size_t) worker; |
| 355 | 2592 |
| 2593 // each worker will actually look at all regions | |
| 2594 for (size_t count = 0; count < regions; ++count) { | |
| 2595 const size_t index = (start_index + count) % regions; | |
| 2596 assert(0 <= index && index < regions, "sanity"); | |
| 2597 HeapRegion* r = region_at(index); | |
| 2598 // we'll ignore "continues humongous" regions (we'll process them | |
| 2599 // when we come across their corresponding "start humongous" | |
| 2600 // region) and regions already claimed | |
| 2601 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
| 2602 continue; | |
| 2603 } | |
| 2604 // OK, try to claim it | |
| 342 | 2605 if (r->claimHeapRegion(claim_value)) { |
| 355 | 2606 // success! |
| 2607 assert(!r->continuesHumongous(), "sanity"); | |
| 2608 if (r->startsHumongous()) { | |
| 2609 // If the region is "starts humongous" we'll iterate over its | |
| 2610 // "continues humongous" first; in fact we'll do them | |
| 2611 // first. The order is important. In on case, calling the | |
| 2612 // closure on the "starts humongous" region might de-allocate | |
| 2613 // and clear all its "continues humongous" regions and, as a | |
| 2614 // result, we might end up processing them twice. So, we'll do | |
| 2615 // them first (notice: most closures will ignore them anyway) and | |
| 2616 // then we'll do the "starts humongous" region. | |
| 2617 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
| 2618 HeapRegion* chr = region_at(ch_index); | |
| 2619 | |
| 2620 // if the region has already been claimed or it's not | |
| 2621 // "continues humongous" we're done | |
| 2622 if (chr->claim_value() == claim_value || | |
| 2623 !chr->continuesHumongous()) { | |
| 2624 break; | |
| 2625 } | |
| 2626 | |
| 2627 // Noone should have claimed it directly. We can given | |
| 2628 // that we claimed its "starts humongous" region. | |
| 2629 assert(chr->claim_value() != claim_value, "sanity"); | |
| 2630 assert(chr->humongous_start_region() == r, "sanity"); | |
| 2631 | |
| 2632 if (chr->claimHeapRegion(claim_value)) { | |
| 2633 // we should always be able to claim it; noone else should | |
| 2634 // be trying to claim this region | |
| 2635 | |
| 2636 bool res2 = cl->doHeapRegion(chr); | |
| 2637 assert(!res2, "Should not abort"); | |
| 2638 | |
| 2639 // Right now, this holds (i.e., no closure that actually | |
| 2640 // does something with "continues humongous" regions | |
| 2641 // clears them). We might have to weaken it in the future, | |
| 2642 // but let's leave these two asserts here for extra safety. | |
| 2643 assert(chr->continuesHumongous(), "should still be the case"); | |
| 2644 assert(chr->humongous_start_region() == r, "sanity"); | |
| 2645 } else { | |
| 2646 guarantee(false, "we should not reach here"); | |
| 2647 } | |
| 2648 } | |
| 2649 } | |
| 2650 | |
| 2651 assert(!r->continuesHumongous(), "sanity"); | |
| 2652 bool res = cl->doHeapRegion(r); | |
| 2653 assert(!res, "Should not abort"); | |
| 2654 } | |
| 2655 } | |
| 2656 } | |
| 2657 | |
| 390 | 2658 class ResetClaimValuesClosure: public HeapRegionClosure { |
| 2659 public: | |
| 2660 bool doHeapRegion(HeapRegion* r) { | |
| 2661 r->set_claim_value(HeapRegion::InitialClaimValue); | |
| 2662 return false; | |
| 2663 } | |
| 2664 }; | |
| 2665 | |
|
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2666 void G1CollectedHeap::reset_heap_region_claim_values() { |
| 390 | 2667 ResetClaimValuesClosure blk; |
| 2668 heap_region_iterate(&blk); | |
| 2669 } | |
| 2670 | |
|
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2671 void G1CollectedHeap::reset_cset_heap_region_claim_values() { |
|
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2672 ResetClaimValuesClosure blk; |
|
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2673 collection_set_iterate(&blk); |
|
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|
2674 } |
|
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|
2675 |
| 355 | 2676 #ifdef ASSERT |
| 2677 // This checks whether all regions in the heap have the correct claim | |
| 2678 // value. I also piggy-backed on this a check to ensure that the | |
| 2679 // humongous_start_region() information on "continues humongous" | |
| 2680 // regions is correct. | |
| 2681 | |
| 2682 class CheckClaimValuesClosure : public HeapRegionClosure { | |
| 2683 private: | |
| 2684 jint _claim_value; | |
| 2685 size_t _failures; | |
| 2686 HeapRegion* _sh_region; | |
| 2687 public: | |
| 2688 CheckClaimValuesClosure(jint claim_value) : | |
| 2689 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
| 2690 bool doHeapRegion(HeapRegion* r) { | |
| 2691 if (r->claim_value() != _claim_value) { | |
|
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|
2692 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
| 355 | 2693 "claim value = %d, should be %d", |
|
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|
2694 HR_FORMAT_PARAMS(r), |
|
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|
2695 r->claim_value(), _claim_value); |
| 355 | 2696 ++_failures; |
| 2697 } | |
| 2698 if (!r->isHumongous()) { | |
| 2699 _sh_region = NULL; | |
| 2700 } else if (r->startsHumongous()) { | |
| 2701 _sh_region = r; | |
| 2702 } else if (r->continuesHumongous()) { | |
| 2703 if (r->humongous_start_region() != _sh_region) { | |
|
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|
2704 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
| 355 | 2705 "HS = "PTR_FORMAT", should be "PTR_FORMAT, |
|
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|
2706 HR_FORMAT_PARAMS(r), |
| 355 | 2707 r->humongous_start_region(), |
| 2708 _sh_region); | |
| 2709 ++_failures; | |
| 342 | 2710 } |
| 2711 } | |
| 355 | 2712 return false; |
| 2713 } | |
| 2714 size_t failures() { | |
| 2715 return _failures; | |
| 2716 } | |
| 2717 }; | |
| 2718 | |
| 2719 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
| 2720 CheckClaimValuesClosure cl(claim_value); | |
| 2721 heap_region_iterate(&cl); | |
| 2722 return cl.failures() == 0; | |
| 2723 } | |
|
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|
2724 |
|
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|
2725 class CheckClaimValuesInCSetHRClosure: public HeapRegionClosure { |
|
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2726 jint _claim_value; |
|
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|
2727 size_t _failures; |
|
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|
2728 |
|
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|
2729 public: |
|
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|
2730 CheckClaimValuesInCSetHRClosure(jint claim_value) : |
|
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|
2731 _claim_value(claim_value), |
|
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|
2732 _failures(0) { } |
|
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|
2733 |
|
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|
2734 size_t failures() { |
|
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|
2735 return _failures; |
|
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|
2736 } |
|
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|
2737 |
|
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|
2738 bool doHeapRegion(HeapRegion* hr) { |
|
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|
2739 assert(hr->in_collection_set(), "how?"); |
|
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|
2740 assert(!hr->isHumongous(), "H-region in CSet"); |
|
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|
2741 if (hr->claim_value() != _claim_value) { |
|
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|
2742 gclog_or_tty->print_cr("CSet Region " HR_FORMAT ", " |
|
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|
2743 "claim value = %d, should be %d", |
|
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|
2744 HR_FORMAT_PARAMS(hr), |
|
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|
2745 hr->claim_value(), _claim_value); |
|
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|
2746 _failures += 1; |
|
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|
2747 } |
|
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|
2748 return false; |
|
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|
2749 } |
|
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|
2750 }; |
|
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|
2751 |
|
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|
2752 bool G1CollectedHeap::check_cset_heap_region_claim_values(jint claim_value) { |
|
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|
2753 CheckClaimValuesInCSetHRClosure cl(claim_value); |
|
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|
2754 collection_set_iterate(&cl); |
|
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|
2755 return cl.failures() == 0; |
|
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|
2756 } |
| 355 | 2757 #endif // ASSERT |
| 342 | 2758 |
|
4709
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|
2759 // Clear the cached CSet starting regions and (more importantly) |
|
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|
2760 // the time stamps. Called when we reset the GC time stamp. |
|
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|
2761 void G1CollectedHeap::clear_cset_start_regions() { |
|
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|
2762 assert(_worker_cset_start_region != NULL, "sanity"); |
|
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|
2763 assert(_worker_cset_start_region_time_stamp != NULL, "sanity"); |
|
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|
2764 |
|
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|
2765 int n_queues = MAX2((int)ParallelGCThreads, 1); |
|
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|
2766 for (int i = 0; i < n_queues; i++) { |
|
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|
2767 _worker_cset_start_region[i] = NULL; |
|
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|
2768 _worker_cset_start_region_time_stamp[i] = 0; |
|
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|
2769 } |
|
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|
2770 } |
|
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|
2771 |
|
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|
2772 // Given the id of a worker, obtain or calculate a suitable |
|
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|
2773 // starting region for iterating over the current collection set. |
|
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|
2774 HeapRegion* G1CollectedHeap::start_cset_region_for_worker(int worker_i) { |
|
4709
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|
2775 assert(get_gc_time_stamp() > 0, "should have been updated by now"); |
|
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|
2776 |
|
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|
2777 HeapRegion* result = NULL; |
|
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|
2778 unsigned gc_time_stamp = get_gc_time_stamp(); |
|
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|
2779 |
|
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|
2780 if (_worker_cset_start_region_time_stamp[worker_i] == gc_time_stamp) { |
|
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|
2781 // Cached starting region for current worker was set |
|
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|
2782 // during the current pause - so it's valid. |
|
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|
2783 // Note: the cached starting heap region may be NULL |
|
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|
2784 // (when the collection set is empty). |
|
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|
2785 result = _worker_cset_start_region[worker_i]; |
|
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changeset
|
2786 assert(result == NULL || result->in_collection_set(), "sanity"); |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2787 return result; |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2788 } |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2789 |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2790 // The cached entry was not valid so let's calculate |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2791 // a suitable starting heap region for this worker. |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2792 |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2793 // We want the parallel threads to start their collection |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2794 // 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
|
2795 // avoid contention. |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2796 // If we have: |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2797 // n collection set regions |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2798 // p threads |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2799 // 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
|
2800 |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2801 result = g1_policy()->collection_set(); |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2802 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2803 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
|
2804 uint active_workers = workers()->active_workers(); |
|
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2805 assert(UseDynamicNumberOfGCThreads || |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2806 active_workers == workers()->total_workers(), |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2807 "Unless dynamic should use total workers"); |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2808 |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2809 size_t end_ind = (cs_size * worker_i) / active_workers; |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2810 size_t start_ind = 0; |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2811 |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2812 if (worker_i > 0 && |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2813 _worker_cset_start_region_time_stamp[worker_i - 1] == gc_time_stamp) { |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2814 // Previous workers starting region is valid |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2815 // so let's iterate from there |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2816 start_ind = (cs_size * (worker_i - 1)) / active_workers; |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2817 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
|
2818 } |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2819 |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2820 for (size_t i = start_ind; i < end_ind; i++) { |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2821 result = result->next_in_collection_set(); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2822 } |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2823 } |
|
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2824 |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2825 // Note: the calculated starting heap region may be NULL |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2826 // (when the collection set is empty). |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2827 assert(result == NULL || result->in_collection_set(), "sanity"); |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2828 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
johnc
parents:
4708
diff
changeset
|
2829 "should be updated only once per pause"); |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2830 _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
|
2831 OrderAccess::storestore(); |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2832 _worker_cset_start_region_time_stamp[worker_i] = gc_time_stamp; |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2833 return result; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2834 } |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2835 |
| 342 | 2836 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { |
| 2837 HeapRegion* r = g1_policy()->collection_set(); | |
| 2838 while (r != NULL) { | |
| 2839 HeapRegion* next = r->next_in_collection_set(); | |
| 2840 if (cl->doHeapRegion(r)) { | |
| 2841 cl->incomplete(); | |
| 2842 return; | |
| 2843 } | |
| 2844 r = next; | |
| 2845 } | |
| 2846 } | |
| 2847 | |
| 2848 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
| 2849 HeapRegionClosure *cl) { | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2850 if (r == NULL) { |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2851 // 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
|
2852 return; |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2853 } |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2854 |
| 342 | 2855 assert(r->in_collection_set(), |
| 2856 "Start region must be a member of the collection set."); | |
| 2857 HeapRegion* cur = r; | |
| 2858 while (cur != NULL) { | |
| 2859 HeapRegion* next = cur->next_in_collection_set(); | |
| 2860 if (cl->doHeapRegion(cur) && false) { | |
| 2861 cl->incomplete(); | |
| 2862 return; | |
| 2863 } | |
| 2864 cur = next; | |
| 2865 } | |
| 2866 cur = g1_policy()->collection_set(); | |
| 2867 while (cur != r) { | |
| 2868 HeapRegion* next = cur->next_in_collection_set(); | |
| 2869 if (cl->doHeapRegion(cur) && false) { | |
| 2870 cl->incomplete(); | |
| 2871 return; | |
| 2872 } | |
| 2873 cur = next; | |
| 2874 } | |
| 2875 } | |
| 2876 | |
| 2877 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
| 3766 | 2878 return n_regions() > 0 ? region_at(0) : NULL; |
| 342 | 2879 } |
| 2880 | |
| 2881 | |
| 2882 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
| 2883 Space* res = heap_region_containing(addr); | |
| 2884 if (res == NULL) | |
| 2885 res = perm_gen()->space_containing(addr); | |
| 2886 return res; | |
| 2887 } | |
| 2888 | |
| 2889 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
| 2890 Space* sp = space_containing(addr); | |
| 2891 if (sp != NULL) { | |
| 2892 return sp->block_start(addr); | |
| 2893 } | |
| 2894 return NULL; | |
| 2895 } | |
| 2896 | |
| 2897 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
| 2898 Space* sp = space_containing(addr); | |
| 2899 assert(sp != NULL, "block_size of address outside of heap"); | |
| 2900 return sp->block_size(addr); | |
| 2901 } | |
| 2902 | |
| 2903 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
| 2904 Space* sp = space_containing(addr); | |
| 2905 return sp->block_is_obj(addr); | |
| 2906 } | |
| 2907 | |
| 2908 bool G1CollectedHeap::supports_tlab_allocation() const { | |
| 2909 return true; | |
| 2910 } | |
| 2911 | |
| 2912 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
| 2913 return HeapRegion::GrainBytes; | |
| 2914 } | |
| 2915 | |
| 2916 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
| 2917 // Return the remaining space in the cur alloc region, but not less than | |
| 2918 // the min TLAB size. | |
|
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2919 |
|
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2920 // Also, this value can be at most the humongous object threshold, |
|
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2921 // since we can't allow tlabs to grow big enough to accomodate |
|
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2922 // humongous objects. |
|
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2923 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2924 HeapRegion* hr = _mutator_alloc_region.get(); |
|
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2925 size_t max_tlab_size = _humongous_object_threshold_in_words * wordSize; |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2926 if (hr == NULL) { |
|
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2927 return max_tlab_size; |
| 342 | 2928 } else { |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2929 return MIN2(MAX2(hr->free(), (size_t) MinTLABSize), max_tlab_size); |
| 342 | 2930 } |
| 2931 } | |
| 2932 | |
| 2933 size_t G1CollectedHeap::max_capacity() const { | |
|
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
2934 return _g1_reserved.byte_size(); |
| 342 | 2935 } |
| 2936 | |
| 2937 jlong G1CollectedHeap::millis_since_last_gc() { | |
| 2938 // assert(false, "NYI"); | |
| 2939 return 0; | |
| 2940 } | |
| 2941 | |
| 2942 void G1CollectedHeap::prepare_for_verify() { | |
| 2943 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
| 2944 ensure_parsability(false); | |
| 2945 } | |
| 2946 g1_rem_set()->prepare_for_verify(); | |
| 2947 } | |
| 2948 | |
| 2949 class VerifyLivenessOopClosure: public OopClosure { | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2950 G1CollectedHeap* _g1h; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2951 VerifyOption _vo; |
| 342 | 2952 public: |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2953 VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo): |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2954 _g1h(g1h), _vo(vo) |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2955 { } |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2956 void do_oop(narrowOop *p) { do_oop_work(p); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2957 void do_oop( oop *p) { do_oop_work(p); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2958 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2959 template <class T> void do_oop_work(T *p) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2960 oop obj = oopDesc::load_decode_heap_oop(p); |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2961 guarantee(obj == NULL || !_g1h->is_obj_dead_cond(obj, _vo), |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2962 "Dead object referenced by a not dead object"); |
| 342 | 2963 } |
| 2964 }; | |
| 2965 | |
| 2966 class VerifyObjsInRegionClosure: public ObjectClosure { | |
| 811 | 2967 private: |
| 342 | 2968 G1CollectedHeap* _g1h; |
| 2969 size_t _live_bytes; | |
| 2970 HeapRegion *_hr; | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2971 VerifyOption _vo; |
| 342 | 2972 public: |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2973 // _vo == UsePrevMarking -> use "prev" marking information, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2974 // _vo == UseNextMarking -> use "next" marking information, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2975 // _vo == UseMarkWord -> use mark word from object header. |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2976 VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo) |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2977 : _live_bytes(0), _hr(hr), _vo(vo) { |
| 342 | 2978 _g1h = G1CollectedHeap::heap(); |
| 2979 } | |
| 2980 void do_object(oop o) { | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2981 VerifyLivenessOopClosure isLive(_g1h, _vo); |
| 342 | 2982 assert(o != NULL, "Huh?"); |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2983 if (!_g1h->is_obj_dead_cond(o, _vo)) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2984 // If the object is alive according to the mark word, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2985 // then verify that the marking information agrees. |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2986 // Note we can't verify the contra-positive of the |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2987 // above: if the object is dead (according to the mark |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2988 // word), it may not be marked, or may have been marked |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2989 // but has since became dead, or may have been allocated |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2990 // since the last marking. |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2991 if (_vo == VerifyOption_G1UseMarkWord) { |
|
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|
2992 guarantee(!_g1h->is_obj_dead(o), "mark word and concurrent mark mismatch"); |
|
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|
2993 } |
|
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|
2994 |
| 342 | 2995 o->oop_iterate(&isLive); |
|
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|
2996 if (!_hr->obj_allocated_since_prev_marking(o)) { |
|
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|
2997 size_t obj_size = o->size(); // Make sure we don't overflow |
|
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|
2998 _live_bytes += (obj_size * HeapWordSize); |
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|
2999 } |
| 342 | 3000 } |
| 3001 } | |
| 3002 size_t live_bytes() { return _live_bytes; } | |
| 3003 }; | |
| 3004 | |
| 3005 class PrintObjsInRegionClosure : public ObjectClosure { | |
| 3006 HeapRegion *_hr; | |
| 3007 G1CollectedHeap *_g1; | |
| 3008 public: | |
| 3009 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
| 3010 _g1 = G1CollectedHeap::heap(); | |
| 3011 }; | |
| 3012 | |
| 3013 void do_object(oop o) { | |
| 3014 if (o != NULL) { | |
| 3015 HeapWord *start = (HeapWord *) o; | |
| 3016 size_t word_sz = o->size(); | |
| 3017 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
| 3018 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
| 3019 (void*) o, word_sz, | |
| 3020 _g1->isMarkedPrev(o), | |
| 3021 _g1->isMarkedNext(o), | |
| 3022 _hr->obj_allocated_since_prev_marking(o)); | |
| 3023 HeapWord *end = start + word_sz; | |
| 3024 HeapWord *cur; | |
| 3025 int *val; | |
| 3026 for (cur = start; cur < end; cur++) { | |
| 3027 val = (int *) cur; | |
| 3028 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
| 3029 } | |
| 3030 } | |
| 3031 } | |
| 3032 }; | |
| 3033 | |
| 3034 class VerifyRegionClosure: public HeapRegionClosure { | |
| 811 | 3035 private: |
|
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|
3036 bool _allow_dirty; |
|
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|
3037 bool _par; |
|
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|
3038 VerifyOption _vo; |
|
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|
3039 bool _failures; |
| 811 | 3040 public: |
|
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|
3041 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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|
3042 // _vo == UseNextMarking -> use "next" marking information, |
|
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|
3043 // _vo == UseMarkWord -> use mark word from object header. |
|
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|
3044 VerifyRegionClosure(bool allow_dirty, bool par, VerifyOption vo) |
|
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|
3045 : _allow_dirty(allow_dirty), |
|
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|
3046 _par(par), |
|
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|
3047 _vo(vo), |
|
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|
3048 _failures(false) {} |
|
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|
3049 |
|
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|
3050 bool failures() { |
|
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|
3051 return _failures; |
|
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|
3052 } |
|
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|
3053 |
| 342 | 3054 bool doHeapRegion(HeapRegion* r) { |
| 390 | 3055 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
| 3056 "Should be unclaimed at verify points."); | |
|
637
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|
3057 if (!r->continuesHumongous()) { |
|
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|
3058 bool failures = false; |
|
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|
3059 r->verify(_allow_dirty, _vo, &failures); |
|
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|
3060 if (failures) { |
|
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|
3061 _failures = true; |
|
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|
3062 } else { |
|
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|
3063 VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo); |
|
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|
3064 r->object_iterate(¬_dead_yet_cl); |
|
4787
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|
3065 if (_vo != VerifyOption_G1UseNextMarking) { |
|
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changeset
|
3066 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
|
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|
3067 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
|
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|
3068 "max_live_bytes "SIZE_FORMAT" " |
|
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|
3069 "< calculated "SIZE_FORMAT, |
|
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|
3070 r->bottom(), r->end(), |
|
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|
3071 r->max_live_bytes(), |
|
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|
3072 not_dead_yet_cl.live_bytes()); |
|
4787
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changeset
|
3073 _failures = true; |
|
2ace1c4ee8da
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changeset
|
3074 } |
|
2ace1c4ee8da
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diff
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|
3075 } else { |
|
2ace1c4ee8da
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changeset
|
3076 // When vo == UseNextMarking we cannot currently do a sanity |
|
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changeset
|
3077 // check on the live bytes as the calculation has not been |
|
2ace1c4ee8da
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|
3078 // finalized yet. |
|
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|
3079 } |
|
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|
3080 } |
| 342 | 3081 } |
|
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changeset
|
3082 return false; // stop the region iteration if we hit a failure |
| 342 | 3083 } |
| 3084 }; | |
| 3085 | |
| 3086 class VerifyRootsClosure: public OopsInGenClosure { | |
| 3087 private: | |
| 3088 G1CollectedHeap* _g1h; | |
|
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changeset
|
3089 VerifyOption _vo; |
| 342 | 3090 bool _failures; |
| 3091 public: | |
|
3772
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changeset
|
3092 // _vo == UsePrevMarking -> use "prev" marking information, |
|
6747fd0512e0
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changeset
|
3093 // _vo == UseNextMarking -> use "next" marking information, |
|
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diff
changeset
|
3094 // _vo == UseMarkWord -> use mark word from object header. |
|
6747fd0512e0
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changeset
|
3095 VerifyRootsClosure(VerifyOption vo) : |
|
845
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diff
changeset
|
3096 _g1h(G1CollectedHeap::heap()), |
|
3772
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diff
changeset
|
3097 _vo(vo), |
|
1020
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diff
changeset
|
3098 _failures(false) { } |
| 342 | 3099 |
| 3100 bool failures() { return _failures; } | |
| 3101 | |
|
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
3102 template <class T> void do_oop_nv(T* p) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
3103 T heap_oop = oopDesc::load_heap_oop(p); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3104 if (!oopDesc::is_null(heap_oop)) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3105 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
|
3772
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diff
changeset
|
3106 if (_g1h->is_obj_dead_cond(obj, _vo)) { |
| 342 | 3107 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
|
1020
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6882730: G1: parallel heap verification messes up region dump
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1019
diff
changeset
|
3108 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
|
3772
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diff
changeset
|
3109 if (_vo == VerifyOption_G1UseMarkWord) { |
|
6747fd0512e0
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diff
changeset
|
3110 gclog_or_tty->print_cr(" Mark word: "PTR_FORMAT, (void*)(obj->mark())); |
|
6747fd0512e0
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diff
changeset
|
3111 } |
| 342 | 3112 obj->print_on(gclog_or_tty); |
| 3113 _failures = true; | |
| 3114 } | |
| 3115 } | |
| 3116 } | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
3117 |
|
df6caf649ff7
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diff
changeset
|
3118 void do_oop(oop* p) { do_oop_nv(p); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
3119 void do_oop(narrowOop* p) { do_oop_nv(p); } |
| 342 | 3120 }; |
| 3121 | |
| 390 | 3122 // This is the task used for parallel heap verification. |
| 3123 | |
| 3124 class G1ParVerifyTask: public AbstractGangTask { | |
| 3125 private: | |
| 3126 G1CollectedHeap* _g1h; | |
|
3772
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diff
changeset
|
3127 bool _allow_dirty; |
|
6747fd0512e0
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3766
diff
changeset
|
3128 VerifyOption _vo; |
|
6747fd0512e0
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changeset
|
3129 bool _failures; |
| 390 | 3130 |
| 3131 public: | |
|
3772
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changeset
|
3132 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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changeset
|
3133 // _vo == UseNextMarking -> use "next" marking information, |
|
6747fd0512e0
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changeset
|
3134 // _vo == UseMarkWord -> use mark word from object header. |
|
6747fd0512e0
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changeset
|
3135 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, VerifyOption vo) : |
| 390 | 3136 AbstractGangTask("Parallel verify task"), |
|
845
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diff
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|
3137 _g1h(g1h), |
|
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6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
3138 _allow_dirty(allow_dirty), |
|
3772
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|
3139 _vo(vo), |
|
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|
3140 _failures(false) { } |
|
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changeset
|
3141 |
|
ff2402f6a50b
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diff
changeset
|
3142 bool failures() { |
|
ff2402f6a50b
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diff
changeset
|
3143 return _failures; |
|
ff2402f6a50b
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changeset
|
3144 } |
| 390 | 3145 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
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|
3146 void work(uint worker_id) { |
|
637
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6817419: G1: Enable extensive verification for humongous regions
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diff
changeset
|
3147 HandleMark hm; |
|
3772
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changeset
|
3148 VerifyRegionClosure blk(_allow_dirty, true, _vo); |
|
4728
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|
3149 _g1h->heap_region_par_iterate_chunked(&blk, worker_id, |
|
4095
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|
3150 _g1h->workers()->active_workers(), |
| 390 | 3151 HeapRegion::ParVerifyClaimValue); |
|
1020
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|
3152 if (blk.failures()) { |
|
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|
3153 _failures = true; |
|
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changeset
|
3154 } |
| 390 | 3155 } |
| 3156 }; | |
| 3157 | |
| 342 | 3158 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
|
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changeset
|
3159 verify(allow_dirty, silent, VerifyOption_G1UsePrevMarking); |
| 811 | 3160 } |
| 3161 | |
| 3162 void G1CollectedHeap::verify(bool allow_dirty, | |
| 3163 bool silent, | |
|
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changeset
|
3164 VerifyOption vo) { |
| 342 | 3165 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
|
3293
1f4413413144
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diff
changeset
|
3166 if (!silent) { gclog_or_tty->print("Roots (excluding permgen) "); } |
|
3772
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|
3167 VerifyRootsClosure rootsCl(vo); |
|
4095
bca17e38de00
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|
3168 |
|
bca17e38de00
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4090
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changeset
|
3169 assert(Thread::current()->is_VM_thread(), |
|
bca17e38de00
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|
3170 "Expected to be executed serially by the VM thread at this point"); |
|
bca17e38de00
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|
3171 |
|
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148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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890
diff
changeset
|
3172 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
|
3772
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|
3173 |
|
3293
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7039089: G1: changeset for 7037276 broke heap verification, and related cleanups
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diff
changeset
|
3174 // We apply the relevant closures to all the oops in the |
|
1f4413413144
7039089: G1: changeset for 7037276 broke heap verification, and related cleanups
ysr
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diff
changeset
|
3175 // system dictionary, the string table and the code cache. |
|
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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|
3176 const int so = SO_AllClasses | SO_Strings | SO_CodeCache; |
|
3772
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changeset
|
3177 |
|
3293
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7039089: G1: changeset for 7037276 broke heap verification, and related cleanups
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diff
changeset
|
3178 process_strong_roots(true, // activate StrongRootsScope |
|
1f4413413144
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diff
changeset
|
3179 true, // we set "collecting perm gen" to true, |
|
1f4413413144
7039089: G1: changeset for 7037276 broke heap verification, and related cleanups
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diff
changeset
|
3180 // so we don't reset the dirty cards in the perm gen. |
|
4910
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7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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changeset
|
3181 ScanningOption(so), // roots scanning options |
| 342 | 3182 &rootsCl, |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
3183 &blobsCl, |
| 342 | 3184 &rootsCl); |
|
3772
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changeset
|
3185 |
|
6747fd0512e0
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diff
changeset
|
3186 // If we're verifying after the marking phase of a Full GC then we can't |
|
6747fd0512e0
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changeset
|
3187 // treat the perm gen as roots into the G1 heap. Some of the objects in |
|
6747fd0512e0
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changeset
|
3188 // the perm gen may be dead and hence not marked. If one of these dead |
|
6747fd0512e0
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changeset
|
3189 // objects is considered to be a root then we may end up with a false |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
changeset
|
3190 // "Root location <x> points to dead ob <y>" failure. |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
changeset
|
3191 if (vo != VerifyOption_G1UseMarkWord) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
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diff
changeset
|
3192 // Since we used "collecting_perm_gen" == true above, we will not have |
|
6747fd0512e0
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parents:
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changeset
|
3193 // checked the refs from perm into the G1-collected heap. We check those |
|
6747fd0512e0
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changeset
|
3194 // references explicitly below. Whether the relevant cards are dirty |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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|
3195 // is checked further below in the rem set verification. |
|
6747fd0512e0
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diff
changeset
|
3196 if (!silent) { gclog_or_tty->print("Permgen roots "); } |
|
6747fd0512e0
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changeset
|
3197 perm_gen()->oop_iterate(&rootsCl); |
|
6747fd0512e0
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|
3198 } |
|
1020
ff2402f6a50b
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|
3199 bool failures = rootsCl.failures(); |
|
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|
3200 |
|
6747fd0512e0
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changeset
|
3201 if (vo != VerifyOption_G1UseMarkWord) { |
|
6747fd0512e0
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johnc
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diff
changeset
|
3202 // If we're verifying during a full GC then the region sets |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
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changeset
|
3203 // will have been torn down at the start of the GC. Therefore |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
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changeset
|
3204 // verifying the region sets will fail. So we only verify |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
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changeset
|
3205 // the region sets when not in a full GC. |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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changeset
|
3206 if (!silent) { gclog_or_tty->print("HeapRegionSets "); } |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
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diff
changeset
|
3207 verify_region_sets(); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
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diff
changeset
|
3208 } |
|
6747fd0512e0
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parents:
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diff
changeset
|
3209 |
| 2152 | 3210 if (!silent) { gclog_or_tty->print("HeapRegions "); } |
| 390 | 3211 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
| 3212 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 3213 "sanity check"); | |
| 3214 | |
|
3772
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diff
changeset
|
3215 G1ParVerifyTask task(this, allow_dirty, vo); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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diff
changeset
|
3216 assert(UseDynamicNumberOfGCThreads || |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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diff
changeset
|
3217 workers()->active_workers() == workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
changeset
|
3218 "If not dynamic should be using all the workers"); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
changeset
|
3219 int n_workers = workers()->active_workers(); |
| 390 | 3220 set_par_threads(n_workers); |
| 3221 workers()->run_task(&task); | |
| 3222 set_par_threads(0); | |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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1019
diff
changeset
|
3223 if (task.failures()) { |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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parents:
1019
diff
changeset
|
3224 failures = true; |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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1019
diff
changeset
|
3225 } |
| 390 | 3226 |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
3227 // Checks that the expected amount of parallel work was done. |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
3228 // The implication is that n_workers is > 0. |
| 390 | 3229 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), |
| 3230 "sanity check"); | |
| 3231 | |
| 3232 reset_heap_region_claim_values(); | |
| 3233 | |
| 3234 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 3235 "sanity check"); | |
| 3236 } else { | |
|
3772
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johnc
parents:
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diff
changeset
|
3237 VerifyRegionClosure blk(allow_dirty, false, vo); |
| 3766 | 3238 heap_region_iterate(&blk); |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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1019
diff
changeset
|
3239 if (blk.failures()) { |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3240 failures = true; |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
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1019
diff
changeset
|
3241 } |
| 390 | 3242 } |
| 2152 | 3243 if (!silent) gclog_or_tty->print("RemSet "); |
| 342 | 3244 rem_set()->verify(); |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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1019
diff
changeset
|
3245 |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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1019
diff
changeset
|
3246 if (failures) { |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3247 gclog_or_tty->print_cr("Heap:"); |
|
4073
53074c2c4600
7099849: G1: include heap region information in hs_err files
tonyp
parents:
4072
diff
changeset
|
3248 // It helps to have the per-region information in the output to |
|
53074c2c4600
7099849: G1: include heap region information in hs_err files
tonyp
parents:
4072
diff
changeset
|
3249 // help us track down what went wrong. This is why we call |
|
53074c2c4600
7099849: G1: include heap region information in hs_err files
tonyp
parents:
4072
diff
changeset
|
3250 // print_extended_on() instead of print_on(). |
|
53074c2c4600
7099849: G1: include heap region information in hs_err files
tonyp
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4072
diff
changeset
|
3251 print_extended_on(gclog_or_tty); |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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parents:
1019
diff
changeset
|
3252 gclog_or_tty->print_cr(""); |
|
1547
fb1a39993f69
6951319: enable solaris builds using Sun Studio 12 update 1
jcoomes
parents:
1545
diff
changeset
|
3253 #ifndef PRODUCT |
| 1044 | 3254 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
| 1388 | 3255 concurrent_mark()->print_reachable("at-verification-failure", |
|
3772
6747fd0512e0
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johnc
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3766
diff
changeset
|
3256 vo, false /* all */); |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3257 } |
|
1547
fb1a39993f69
6951319: enable solaris builds using Sun Studio 12 update 1
jcoomes
parents:
1545
diff
changeset
|
3258 #endif |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3259 gclog_or_tty->flush(); |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3260 } |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3261 guarantee(!failures, "there should not have been any failures"); |
| 342 | 3262 } else { |
| 3263 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
| 3264 } | |
| 3265 } | |
| 3266 | |
| 3267 class PrintRegionClosure: public HeapRegionClosure { | |
| 3268 outputStream* _st; | |
| 3269 public: | |
| 3270 PrintRegionClosure(outputStream* st) : _st(st) {} | |
| 3271 bool doHeapRegion(HeapRegion* r) { | |
| 3272 r->print_on(_st); | |
| 3273 return false; | |
| 3274 } | |
| 3275 }; | |
| 3276 | |
| 3277 void G1CollectedHeap::print_on(outputStream* st) const { | |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3278 st->print(" %-20s", "garbage-first heap"); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3279 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
|
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
3280 capacity()/K, used_unlocked()/K); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3281 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3282 _g1_storage.low_boundary(), |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3283 _g1_storage.high(), |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3284 _g1_storage.high_boundary()); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3285 st->cr(); |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3983
diff
changeset
|
3286 st->print(" region size " SIZE_FORMAT "K, ", HeapRegion::GrainBytes / K); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3287 size_t young_regions = _young_list->length(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3288 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3289 young_regions, young_regions * HeapRegion::GrainBytes / K); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3290 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3291 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3292 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3293 st->cr(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3294 perm()->as_gen()->print_on(st); |
|
4073
53074c2c4600
7099849: G1: include heap region information in hs_err files
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4072
diff
changeset
|
3295 } |
|
53074c2c4600
7099849: G1: include heap region information in hs_err files
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4072
diff
changeset
|
3296 |
|
53074c2c4600
7099849: G1: include heap region information in hs_err files
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4072
diff
changeset
|
3297 void G1CollectedHeap::print_extended_on(outputStream* st) const { |
|
53074c2c4600
7099849: G1: include heap region information in hs_err files
tonyp
parents:
4072
diff
changeset
|
3298 print_on(st); |
|
53074c2c4600
7099849: G1: include heap region information in hs_err files
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4072
diff
changeset
|
3299 |
|
53074c2c4600
7099849: G1: include heap region information in hs_err files
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diff
changeset
|
3300 // Print the per-region information. |
|
53074c2c4600
7099849: G1: include heap region information in hs_err files
tonyp
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4072
diff
changeset
|
3301 st->cr(); |
|
53074c2c4600
7099849: G1: include heap region information in hs_err files
tonyp
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4072
diff
changeset
|
3302 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 | 3303 PrintRegionClosure blk(st); |
| 3766 | 3304 heap_region_iterate(&blk); |
| 342 | 3305 } |
| 3306 | |
| 3307 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
3308 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 1019 | 3309 workers()->print_worker_threads_on(st); |
| 3310 } | |
| 3311 _cmThread->print_on(st); | |
| 342 | 3312 st->cr(); |
| 1019 | 3313 _cm->print_worker_threads_on(st); |
| 3314 _cg1r->print_worker_threads_on(st); | |
| 342 | 3315 st->cr(); |
| 3316 } | |
| 3317 | |
| 3318 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
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1755
diff
changeset
|
3319 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3320 workers()->threads_do(tc); |
| 3321 } | |
| 3322 tc->do_thread(_cmThread); | |
| 794 | 3323 _cg1r->threads_do(tc); |
| 342 | 3324 } |
| 3325 | |
| 3326 void G1CollectedHeap::print_tracing_info() const { | |
| 3327 // We'll overload this to mean "trace GC pause statistics." | |
| 3328 if (TraceGen0Time || TraceGen1Time) { | |
| 3329 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
| 3330 // to that. | |
| 3331 g1_policy()->print_tracing_info(); | |
| 3332 } | |
| 751 | 3333 if (G1SummarizeRSetStats) { |
| 342 | 3334 g1_rem_set()->print_summary_info(); |
| 3335 } | |
| 1282 | 3336 if (G1SummarizeConcMark) { |
| 342 | 3337 concurrent_mark()->print_summary_info(); |
| 3338 } | |
| 3339 g1_policy()->print_yg_surv_rate_info(); | |
| 3340 SpecializationStats::print(); | |
| 3341 } | |
| 3342 | |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
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3774
diff
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|
3343 #ifndef PRODUCT |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
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3774
diff
changeset
|
3344 // Helpful for debugging RSet issues. |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3345 |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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3774
diff
changeset
|
3346 class PrintRSetsClosure : public HeapRegionClosure { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3347 private: |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
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3774
diff
changeset
|
3348 const char* _msg; |
|
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|
3349 size_t _occupied_sum; |
|
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|
3350 |
|
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|
3351 public: |
|
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|
3352 bool doHeapRegion(HeapRegion* r) { |
|
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3353 HeapRegionRemSet* hrrs = r->rem_set(); |
|
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3354 size_t occupied = hrrs->occupied(); |
|
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|
3355 _occupied_sum += occupied; |
|
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|
3356 |
|
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|
3357 gclog_or_tty->print_cr("Printing RSet for region "HR_FORMAT, |
|
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|
3358 HR_FORMAT_PARAMS(r)); |
|
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|
3359 if (occupied == 0) { |
|
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|
3360 gclog_or_tty->print_cr(" RSet is empty"); |
|
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|
3361 } else { |
|
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|
3362 hrrs->print(); |
|
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|
3363 } |
|
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|
3364 gclog_or_tty->print_cr("----------"); |
|
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|
3365 return false; |
|
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|
3366 } |
|
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|
3367 |
|
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|
3368 PrintRSetsClosure(const char* msg) : _msg(msg), _occupied_sum(0) { |
|
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|
3369 gclog_or_tty->cr(); |
|
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|
3370 gclog_or_tty->print_cr("========================================"); |
|
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|
3371 gclog_or_tty->print_cr(msg); |
|
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|
3372 gclog_or_tty->cr(); |
|
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|
3373 } |
|
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|
3374 |
|
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|
3375 ~PrintRSetsClosure() { |
|
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|
3376 gclog_or_tty->print_cr("Occupied Sum: "SIZE_FORMAT, _occupied_sum); |
|
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|
3377 gclog_or_tty->print_cr("========================================"); |
|
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|
3378 gclog_or_tty->cr(); |
|
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|
3379 } |
|
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|
3380 }; |
|
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|
3381 |
|
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|
3382 void G1CollectedHeap::print_cset_rsets() { |
|
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|
3383 PrintRSetsClosure cl("Printing CSet RSets"); |
|
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|
3384 collection_set_iterate(&cl); |
|
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|
3385 } |
|
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|
3386 |
|
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|
3387 void G1CollectedHeap::print_all_rsets() { |
|
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|
3388 PrintRSetsClosure cl("Printing All RSets");; |
|
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|
3389 heap_region_iterate(&cl); |
|
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|
3390 } |
|
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|
3391 #endif // PRODUCT |
|
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|
3392 |
| 342 | 3393 G1CollectedHeap* G1CollectedHeap::heap() { |
| 3394 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
| 3395 "not a garbage-first heap"); | |
| 3396 return _g1h; | |
| 3397 } | |
| 3398 | |
| 3399 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
|
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3400 // always_do_update_barrier = false; |
| 342 | 3401 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
| 3402 // Call allocation profiler | |
| 3403 AllocationProfiler::iterate_since_last_gc(); | |
| 3404 // Fill TLAB's and such | |
| 3405 ensure_parsability(true); | |
| 3406 } | |
| 3407 | |
| 3408 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
| 3409 // FIXME: what is this about? | |
| 3410 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
| 3411 // is set. | |
| 3412 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
| 3413 "derived pointer present")); | |
|
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|
3414 // always_do_update_barrier = true; |
|
3979
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6484982: G1: process references during evacuation pauses
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|
3415 |
|
4dfb2df418f2
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|
3416 // We have just completed a GC. Update the soft reference |
|
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|
3417 // policy with the new heap occupancy |
|
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|
3418 Universe::update_heap_info_at_gc(); |
| 342 | 3419 } |
| 3420 | |
| 1973 | 3421 HeapWord* G1CollectedHeap::do_collection_pause(size_t word_size, |
| 3422 unsigned int gc_count_before, | |
| 3423 bool* succeeded) { | |
| 3424 assert_heap_not_locked_and_not_at_safepoint(); | |
| 342 | 3425 g1_policy()->record_stop_world_start(); |
| 1973 | 3426 VM_G1IncCollectionPause op(gc_count_before, |
| 3427 word_size, | |
| 3428 false, /* should_initiate_conc_mark */ | |
| 3429 g1_policy()->max_pause_time_ms(), | |
| 3430 GCCause::_g1_inc_collection_pause); | |
| 3431 VMThread::execute(&op); | |
| 3432 | |
| 3433 HeapWord* result = op.result(); | |
| 3434 bool ret_succeeded = op.prologue_succeeded() && op.pause_succeeded(); | |
| 3435 assert(result == NULL || ret_succeeded, | |
| 3436 "the result should be NULL if the VM did not succeed"); | |
| 3437 *succeeded = ret_succeeded; | |
| 3438 | |
| 3439 assert_heap_not_locked(); | |
| 3440 return result; | |
| 342 | 3441 } |
| 3442 | |
| 3443 void | |
| 3444 G1CollectedHeap::doConcurrentMark() { | |
|
845
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3445 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
|
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|
3446 if (!_cmThread->in_progress()) { |
|
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|
3447 _cmThread->set_started(); |
|
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|
3448 CGC_lock->notify(); |
| 342 | 3449 } |
| 3450 } | |
| 3451 | |
| 3452 size_t G1CollectedHeap::pending_card_num() { | |
| 3453 size_t extra_cards = 0; | |
| 3454 JavaThread *curr = Threads::first(); | |
| 3455 while (curr != NULL) { | |
| 3456 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
| 3457 extra_cards += dcq.size(); | |
| 3458 curr = curr->next(); | |
| 3459 } | |
| 3460 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 3461 size_t buffer_size = dcqs.buffer_size(); | |
| 3462 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 3463 return buffer_size * buffer_num + extra_cards; | |
| 3464 } | |
| 3465 | |
| 3466 size_t G1CollectedHeap::max_pending_card_num() { | |
| 3467 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 3468 size_t buffer_size = dcqs.buffer_size(); | |
| 3469 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 3470 int thread_num = Threads::number_of_threads(); | |
| 3471 return (buffer_num + thread_num) * buffer_size; | |
| 3472 } | |
| 3473 | |
| 3474 size_t G1CollectedHeap::cards_scanned() { | |
| 1861 | 3475 return g1_rem_set()->cardsScanned(); |
| 342 | 3476 } |
| 3477 | |
| 3478 void | |
| 3479 G1CollectedHeap::setup_surviving_young_words() { | |
| 3480 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
|
4090
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|
3481 size_t array_length = g1_policy()->young_cset_region_length(); |
| 342 | 3482 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); |
| 3483 if (_surviving_young_words == NULL) { | |
| 3484 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
| 3485 "Not enough space for young surv words summary."); | |
| 3486 } | |
| 3487 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
|
845
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|
3488 #ifdef ASSERT |
| 342 | 3489 for (size_t i = 0; i < array_length; ++i) { |
|
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|
3490 assert( _surviving_young_words[i] == 0, "memset above" ); |
|
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|
3491 } |
|
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|
3492 #endif // !ASSERT |
| 342 | 3493 } |
| 3494 | |
| 3495 void | |
| 3496 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
| 3497 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
|
4090
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|
3498 size_t array_length = g1_policy()->young_cset_region_length(); |
| 342 | 3499 for (size_t i = 0; i < array_length; ++i) |
| 3500 _surviving_young_words[i] += surv_young_words[i]; | |
| 3501 } | |
| 3502 | |
| 3503 void | |
| 3504 G1CollectedHeap::cleanup_surviving_young_words() { | |
| 3505 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
| 3506 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
| 3507 _surviving_young_words = NULL; | |
| 3508 } | |
| 3509 | |
|
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|
3510 #ifdef ASSERT |
|
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|
3511 class VerifyCSetClosure: public HeapRegionClosure { |
|
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|
3512 public: |
|
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|
3513 bool doHeapRegion(HeapRegion* hr) { |
|
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|
3514 // Here we check that the CSet region's RSet is ready for parallel |
|
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|
3515 // iteration. The fields that we'll verify are only manipulated |
|
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|
3516 // when the region is part of a CSet and is collected. Afterwards, |
|
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|
3517 // we reset these fields when we clear the region's RSet (when the |
|
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|
3518 // region is freed) so they are ready when the region is |
|
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|
3519 // re-allocated. The only exception to this is if there's an |
|
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|
3520 // evacuation failure and instead of freeing the region we leave |
|
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|
3521 // it in the heap. In that case, we reset these fields during |
|
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|
3522 // evacuation failure handling. |
|
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|
3523 guarantee(hr->rem_set()->verify_ready_for_par_iteration(), "verification"); |
|
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|
3524 |
|
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|
3525 // Here's a good place to add any other checks we'd like to |
|
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|
3526 // perform on CSet regions. |
|
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0414c1049f15
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diff
changeset
|
3527 return false; |
|
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diff
changeset
|
3528 } |
|
0414c1049f15
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diff
changeset
|
3529 }; |
|
3777
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|
3530 #endif // ASSERT |
|
1261
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|
3531 |
| 1709 | 3532 #if TASKQUEUE_STATS |
| 3533 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
| 3534 st->print_raw_cr("GC Task Stats"); | |
| 3535 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
| 3536 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
| 3537 } | |
| 3538 | |
| 3539 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
| 3540 print_taskqueue_stats_hdr(st); | |
| 3541 | |
| 3542 TaskQueueStats totals; | |
|
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3543 const int n = workers() != NULL ? workers()->total_workers() : 1; |
| 1709 | 3544 for (int i = 0; i < n; ++i) { |
| 3545 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
| 3546 totals += task_queue(i)->stats; | |
| 3547 } | |
| 3548 st->print_raw("tot "); totals.print(st); st->cr(); | |
| 3549 | |
| 3550 DEBUG_ONLY(totals.verify()); | |
| 3551 } | |
| 3552 | |
| 3553 void G1CollectedHeap::reset_taskqueue_stats() { | |
|
1755
8e5955ddf8e4
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parents:
1719
diff
changeset
|
3554 const int n = workers() != NULL ? workers()->total_workers() : 1; |
| 1709 | 3555 for (int i = 0; i < n; ++i) { |
| 3556 task_queue(i)->stats.reset(); | |
| 3557 } | |
| 3558 } | |
| 3559 #endif // TASKQUEUE_STATS | |
| 3560 | |
| 1973 | 3561 bool |
|
1656
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6944166: G1: explicit GCs are not always handled correctly
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1611
diff
changeset
|
3562 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
| 2152 | 3563 assert_at_safepoint(true /* should_be_vm_thread */); |
| 3564 guarantee(!is_gc_active(), "collection is not reentrant"); | |
| 3565 | |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1313
diff
changeset
|
3566 if (GC_locker::check_active_before_gc()) { |
| 1973 | 3567 return false; |
|
1359
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1313
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changeset
|
3568 } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3569 |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2039
diff
changeset
|
3570 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
|
2039
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
parents:
2038
diff
changeset
|
3571 ResourceMark rm; |
|
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
parents:
2038
diff
changeset
|
3572 |
|
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4787
diff
changeset
|
3573 print_heap_before_gc(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3574 |
| 4072 | 3575 HRSPhaseSetter x(HRSPhaseEvacuation); |
| 2152 | 3576 verify_region_sets_optional(); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3577 verify_dirty_young_regions(); |
| 2152 | 3578 |
|
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3579 // This call will decide whether this pause is an initial-mark |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3580 // pause. If it is, during_initial_mark_pause() will return true |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3581 // for the duration of this pause. |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3582 g1_policy()->decide_on_conc_mark_initiation(); |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3583 |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3584 // We do not allow initial-mark to be piggy-backed on a mixed GC. |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3585 assert(!g1_policy()->during_initial_mark_pause() || |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3586 g1_policy()->gcs_are_young(), "sanity"); |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3587 |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3588 // We also do not allow mixed GCs during marking. |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3589 assert(!mark_in_progress() || g1_policy()->gcs_are_young(), "sanity"); |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3590 |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3591 // Record whether this pause is an initial mark. When the current |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3592 // thread has completed its logging output and it's safe to signal |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3593 // the CM thread, the flag's value in the policy has been reset. |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3594 bool should_start_conc_mark = g1_policy()->during_initial_mark_pause(); |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3595 |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3596 // Inner scope for scope based logging, timers, and stats collection |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3597 { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3598 char verbose_str[128]; |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3599 sprintf(verbose_str, "GC pause "); |
| 4710 | 3600 if (g1_policy()->gcs_are_young()) { |
|
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3601 strcat(verbose_str, "(young)"); |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3602 } else { |
| 4710 | 3603 strcat(verbose_str, "(mixed)"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3604 } |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3605 if (g1_policy()->during_initial_mark_pause()) { |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3606 strcat(verbose_str, " (initial-mark)"); |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3607 // We are about to start a marking cycle, so we increment the |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3608 // full collection counter. |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3609 increment_total_full_collections(); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3610 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3611 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3612 // if PrintGCDetails is on, we'll print long statistics information |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3613 // in the collector policy code, so let's not print this as the output |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3614 // is messy if we do. |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3615 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3616 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3617 TraceTime t(verbose_str, PrintGC && !PrintGCDetails, true, gclog_or_tty); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3618 |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3619 TraceCollectorStats tcs(g1mm()->incremental_collection_counters()); |
|
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
3620 TraceMemoryManagerStats tms(false /* fullGC */, gc_cause()); |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3621 |
| 2361 | 3622 // If the secondary_free_list is not empty, append it to the |
| 3623 // free_list. No need to wait for the cleanup operation to finish; | |
| 3624 // the region allocation code will check the secondary_free_list | |
| 3625 // and wait if necessary. If the G1StressConcRegionFreeing flag is | |
| 3626 // set, skip this step so that the region allocation code has to | |
| 3627 // get entries from the secondary_free_list. | |
| 2152 | 3628 if (!G1StressConcRegionFreeing) { |
| 2361 | 3629 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 3630 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3631 |
|
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3632 assert(check_young_list_well_formed(), |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3633 "young list should be well formed"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3634 |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3635 // 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
|
3636 // 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
|
3637 // it will be set. |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3638 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3639 { // 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
|
3640 IsGCActiveMark x; |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3641 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3642 gc_prologue(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3643 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
|
3644 increment_gc_time_stamp(); |
| 342 | 3645 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3646 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3647 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
|
3648 gclog_or_tty->print(" VerifyBeforeGC:"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3649 prepare_for_verify(); |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3650 Universe::verify(/* allow dirty */ false, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3651 /* silent */ false, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3652 /* option */ VerifyOption_G1UsePrevMarking); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3653 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3654 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3655 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3656 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3657 // Please see comment in g1CollectedHeap.hpp and |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3658 // G1CollectedHeap::ref_processing_init() to see how |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3659 // reference processing currently works in G1. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3660 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3661 // Enable discovery in the STW reference processor |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3662 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3663 true /*verify_no_refs*/); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3664 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3665 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3666 // We want to temporarily turn off discovery by the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3667 // CM ref processor, if necessary, and turn it back on |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3668 // on again later if we do. Using a scoped |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3669 // NoRefDiscovery object will do this. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3670 NoRefDiscovery no_cm_discovery(ref_processor_cm()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3671 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3672 // 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
|
3673 // of the collection set!). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3674 release_mutator_alloc_region(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3675 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3676 // We should call this after we retire the mutator alloc |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3677 // region(s) so that all the ALLOC / RETIRE events are generated |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3678 // before the start GC event. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3679 _hr_printer.start_gc(false /* full */, (size_t) total_collections()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3680 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3681 // The elapsed time induced by the start time below deliberately elides |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3682 // the possible verification above. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3683 double start_time_sec = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3684 size_t start_used_bytes = used(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3685 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3686 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3687 gclog_or_tty->print_cr("\nBefore recording pause start.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3688 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3689 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
|
3690 #endif // YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3691 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3692 g1_policy()->record_collection_pause_start(start_time_sec, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3693 start_used_bytes); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3694 |
|
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3695 double scan_wait_start = os::elapsedTime(); |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3696 // We have to wait until the CM threads finish scanning the |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3697 // root regions as it's the only way to ensure that all the |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3698 // objects on them have been correctly scanned before we start |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3699 // moving them during the GC. |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3700 bool waited = _cm->root_regions()->wait_until_scan_finished(); |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3701 if (waited) { |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3702 double scan_wait_end = os::elapsedTime(); |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3703 double wait_time_ms = (scan_wait_end - scan_wait_start) * 1000.0; |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3704 g1_policy()->record_root_region_scan_wait_time(wait_time_ms); |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3705 } |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3706 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3707 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3708 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3709 _young_list->print(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3710 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3711 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3712 if (g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3713 concurrent_mark()->checkpointRootsInitialPre(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3714 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3715 perm_gen()->save_marks(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3716 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3717 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3718 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3719 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3720 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
|
3721 #endif // YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3722 |
|
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4910
diff
changeset
|
3723 g1_policy()->finalize_cset(target_pause_time_ms); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3724 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3725 _cm->note_start_of_gc(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3726 // 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
|
3727 // we have not filtered them yet (we'll do so during the |
|
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4910
diff
changeset
|
3728 // GC). We also call this after finalize_cset() to |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3729 // ensure that the CSet has been finalized. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3730 _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
|
3731 true /* verify_enqueued_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3732 false /* verify_thread_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3733 true /* verify_fingers */); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3734 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3735 if (_hr_printer.is_active()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3736 HeapRegion* hr = g1_policy()->collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3737 while (hr != NULL) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3738 G1HRPrinter::RegionType type; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3739 if (!hr->is_young()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3740 type = G1HRPrinter::Old; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3741 } else if (hr->is_survivor()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3742 type = G1HRPrinter::Survivor; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3743 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3744 type = G1HRPrinter::Eden; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3745 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3746 _hr_printer.cset(hr); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3747 hr = hr->next_in_collection_set(); |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3748 } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3749 } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3750 |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3751 #ifdef ASSERT |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3752 VerifyCSetClosure cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3753 collection_set_iterate(&cl); |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3754 #endif // ASSERT |
| 1707 | 3755 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3756 setup_surviving_young_words(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3757 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3758 // Initialize the GC alloc regions. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3759 init_gc_alloc_regions(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3760 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3761 // Actually do the work... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3762 evacuate_collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3763 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3764 // 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
|
3765 // (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
|
3766 // 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
|
3767 // 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
|
3768 // we checked. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3769 _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
|
3770 false /* verify_enqueued_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3771 true /* verify_thread_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3772 true /* verify_fingers */); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3773 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3774 free_collection_set(g1_policy()->collection_set()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3775 g1_policy()->clear_collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3776 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3777 cleanup_surviving_young_words(); |
|
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 // Start a new incremental collection set for the next pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3780 g1_policy()->start_incremental_cset_building(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3781 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3782 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3783 // regions to the incremental collection set for the next |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3784 // evacuation pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3785 clear_cset_fast_test(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3786 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3787 _young_list->reset_sampled_info(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3788 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3789 // Don't check the whole heap at this point as the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3790 // GC alloc regions from this pause have been tagged |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3791 // as survivors and moved on to the survivor list. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3792 // Survivor regions will fail the !is_young() check. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3793 assert(check_young_list_empty(false /* check_heap */), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3794 "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
|
3795 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3796 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3797 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3798 _young_list->print(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3799 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3800 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3801 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3802 _young_list->first_survivor_region(), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3803 _young_list->last_survivor_region()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3804 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3805 _young_list->reset_auxilary_lists(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3806 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3807 if (evacuation_failed()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3808 _summary_bytes_used = recalculate_used(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3809 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3810 // The "used" of the the collection set have already been subtracted |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3811 // when they were freed. Add in the bytes evacuated. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3812 _summary_bytes_used += g1_policy()->bytes_copied_during_gc(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3813 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3814 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3815 if (g1_policy()->during_initial_mark_pause()) { |
|
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3816 // We have to do this before we notify the CM threads that |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3817 // they can start working to make sure that all the |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3818 // appropriate initialization is done on the CM object. |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3819 concurrent_mark()->checkpointRootsInitialPost(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3820 set_marking_started(); |
|
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3821 // Note that we don't actually trigger the CM thread at |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3822 // this point. We do that later when we're sure that |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3823 // the current thread has completed its logging output. |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3824 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3825 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3826 allocate_dummy_regions(); |
|
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
3827 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3828 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3829 gclog_or_tty->print_cr("\nEnd of the pause.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3830 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3831 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
|
3832 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3833 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3834 init_mutator_alloc_region(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3835 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3836 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3837 size_t expand_bytes = g1_policy()->expansion_amount(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3838 if (expand_bytes > 0) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3839 size_t bytes_before = capacity(); |
| 4785 | 3840 // No need for an ergo verbose message here, |
| 3841 // expansion_amount() does this when it returns a value > 0. | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3842 if (!expand(expand_bytes)) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3843 // We failed to expand the heap so let's verify that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3844 // committed/uncommitted amount match the backing store |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3845 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3846 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3847 } |
|
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3848 } |
|
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3849 } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3850 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3851 // 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
|
3852 // 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
|
3853 _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
|
3854 true /* verify_enqueued_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3855 true /* verify_thread_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3856 true /* verify_fingers */); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3857 _cm->note_end_of_gc(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3858 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3859 double end_time_sec = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3860 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3861 g1_policy()->record_pause_time_ms(pause_time_ms); |
| 4711 | 3862 int active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
| 3863 workers()->active_workers() : 1); | |
| 3864 g1_policy()->record_collection_pause_end(active_workers); | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3865 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3866 MemoryService::track_memory_usage(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3867 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3868 // 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
|
3869 // update buffers to bring the RSets up-to-date if |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3870 // G1HRRSFlushLogBuffersOnVerify has been set. While scanning |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3871 // 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
|
3872 // regions we just allocated to (i.e., the GC alloc |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3873 // regions). However, during the last GC we called |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3874 // set_saved_mark() on all the GC alloc regions, so card |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3875 // scanning might skip the [saved_mark_word()...top()] area of |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3876 // those regions (i.e., the area we allocated objects into |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3877 // during the last GC). But it shouldn't. Given that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3878 // saved_mark_word() is conditional on whether the GC time stamp |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3879 // 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
|
3880 // 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
|
3881 // regions and saved_mark_word() will simply return top() for |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3882 // 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
|
3883 // than iterating over the regions and fixing them. In fact, the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3884 // GC time stamp increment here also ensures that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3885 // saved_mark_word() will return top() between pauses, i.e., |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3886 // during concurrent refinement. So we don't need the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3887 // is_gc_active() check to decided which top to use when |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3888 // scanning cards (see CR 7039627). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3889 increment_gc_time_stamp(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3890 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3891 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3892 HandleMark hm; // Discard invalid handles created during verification |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3893 gclog_or_tty->print(" VerifyAfterGC:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3894 prepare_for_verify(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3895 Universe::verify(/* allow dirty */ true, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3896 /* silent */ false, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3897 /* option */ VerifyOption_G1UsePrevMarking); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3898 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3899 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3900 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3901 ref_processor_stw()->verify_no_references_recorded(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3902 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3903 // 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
|
3904 } |
|
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3905 |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3906 // 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
|
3907 // 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
|
3908 // 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
|
3909 // RETIRE events are generated before the end GC event. |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3910 _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
|
3911 |
|
3764
053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
tonyp
parents:
3378
diff
changeset
|
3912 // 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
|
3913 g1_policy()->print_heap_transition(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3914 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3915 if (mark_in_progress()) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3916 concurrent_mark()->update_g1_committed(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3917 } |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3918 |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3919 #ifdef TRACESPINNING |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3920 ParallelTaskTerminator::print_termination_counts(); |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3921 #endif |
| 342 | 3922 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3923 gc_epilogue(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3924 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3925 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3926 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3927 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
|
3928 print_tracing_info(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3929 vm_exit(-1); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3930 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3931 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3932 |
|
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3933 // The closing of the inner scope, immediately above, will complete |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3934 // the PrintGC logging output. The record_collection_pause_end() call |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3935 // above will complete the logging output of PrintGCDetails. |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3936 // |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3937 // It is not yet to safe, however, to tell the concurrent mark to |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3938 // start as we have some optional output below. We don't want the |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3939 // output from the concurrent mark thread interfering with this |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3940 // logging output either. |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3941 |
| 3766 | 3942 _hrs.verify_optional(); |
| 2152 | 3943 verify_region_sets_optional(); |
| 3944 | |
| 1709 | 3945 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
| 3946 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); | |
| 3947 | |
|
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4787
diff
changeset
|
3948 print_heap_after_gc(); |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
3949 g1mm()->update_sizes(); |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3950 |
|
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3951 if (G1SummarizeRSetStats && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3952 (G1SummarizeRSetStatsPeriod > 0) && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3953 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3954 g1_rem_set()->print_summary_info(); |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3955 } |
| 1973 | 3956 |
|
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3957 // It should now be safe to tell the concurrent mark thread to start |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3958 // without its logging output interfering with the logging output |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3959 // that came from the pause. |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3960 |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3961 if (should_start_conc_mark) { |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3962 // CAUTION: after the doConcurrentMark() call below, |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3963 // the concurrent marking thread(s) could be running |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3964 // concurrently with us. Make sure that anything after |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3965 // this point does not assume that we are the only GC thread |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3966 // running. Note: of course, the actual marking work will |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3967 // not start until the safepoint itself is released in |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3968 // ConcurrentGCThread::safepoint_desynchronize(). |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3969 doConcurrentMark(); |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3970 } |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3971 |
| 1973 | 3972 return true; |
| 342 | 3973 } |
| 3974 | |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3975 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3976 { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3977 size_t gclab_word_size; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3978 switch (purpose) { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3979 case GCAllocForSurvived: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3980 gclab_word_size = YoungPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3981 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3982 case GCAllocForTenured: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3983 gclab_word_size = OldPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3984 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3985 default: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3986 assert(false, "unknown GCAllocPurpose"); |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3987 gclab_word_size = OldPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3988 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3989 } |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3990 return gclab_word_size; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3991 } |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3992 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3993 void G1CollectedHeap::init_mutator_alloc_region() { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3994 assert(_mutator_alloc_region.get() == NULL, "pre-condition"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3995 _mutator_alloc_region.init(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3996 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3997 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3998 void G1CollectedHeap::release_mutator_alloc_region() { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3999 _mutator_alloc_region.release(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
4000 assert(_mutator_alloc_region.get() == NULL, "post-condition"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
4001 } |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4002 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4003 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
|
4004 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
|
4005 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4006 _survivor_gc_alloc_region.init(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4007 _old_gc_alloc_region.init(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4008 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
|
4009 _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
|
4010 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4011 // 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
|
4012 // 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
|
4013 // 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
|
4014 // 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
|
4015 // 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
|
4016 // 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
|
4017 // 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
|
4018 // 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
|
4019 // 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
|
4020 if (retained_region != NULL && |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4021 !retained_region->in_collection_set() && |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4022 !(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
|
4023 !retained_region->is_empty() && |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4024 !retained_region->isHumongous()) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4025 retained_region->set_saved_mark(); |
| 4072 | 4026 // The retained region was added to the old region set when it was |
| 4027 // retired. We have to remove it now, since we don't allow regions | |
| 4028 // we allocate to in the region sets. We'll re-add it later, when | |
| 4029 // it's retired again. | |
| 4030 _old_set.remove(retained_region); | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4031 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
|
4032 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
|
4033 _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
|
4034 _hr_printer.reuse(retained_region); |
| 342 | 4035 } |
| 4036 } | |
| 4037 | |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4038 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
|
4039 _survivor_gc_alloc_region.release(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4040 // 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
|
4041 // _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
|
4042 // _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
|
4043 // 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
|
4044 // condition. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4045 _retained_old_gc_alloc_region = _old_gc_alloc_region.release(); |
| 342 | 4046 } |
| 4047 | |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4048 void G1CollectedHeap::abandon_gc_alloc_regions() { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4049 assert(_survivor_gc_alloc_region.get() == NULL, "pre-condition"); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4050 assert(_old_gc_alloc_region.get() == NULL, "pre-condition"); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4051 _retained_old_gc_alloc_region = NULL; |
| 342 | 4052 } |
| 4053 | |
| 4054 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
| 4055 _drain_in_progress = false; | |
| 4056 set_evac_failure_closure(cl); | |
| 4057 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 4058 } | |
| 4059 | |
| 4060 void G1CollectedHeap::finalize_for_evac_failure() { | |
| 4061 assert(_evac_failure_scan_stack != NULL && | |
| 4062 _evac_failure_scan_stack->length() == 0, | |
| 4063 "Postcondition"); | |
| 4064 assert(!_drain_in_progress, "Postcondition"); | |
| 1045 | 4065 delete _evac_failure_scan_stack; |
| 342 | 4066 _evac_failure_scan_stack = NULL; |
| 4067 } | |
| 4068 | |
| 4069 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
|
4783
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4070 assert(check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4071 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4072 |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4073 G1ParRemoveSelfForwardPtrsTask rsfp_task(this); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4074 |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4075 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4076 set_par_threads(); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4077 workers()->run_task(&rsfp_task); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4078 set_par_threads(0); |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
4079 } else { |
|
4783
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4080 rsfp_task.work(0); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4081 } |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4082 |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
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4781
diff
changeset
|
4083 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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|
4084 |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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diff
changeset
|
4085 // Reset the claim values in the regions in the collection set. |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4086 reset_cset_heap_region_claim_values(); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
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diff
changeset
|
4087 |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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diff
changeset
|
4088 assert(check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
| 342 | 4089 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); |
| 4090 | |
| 4091 // Now restore saved marks, if any. | |
| 4092 if (_objs_with_preserved_marks != NULL) { | |
| 4093 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
| 4094 guarantee(_objs_with_preserved_marks->length() == | |
| 4095 _preserved_marks_of_objs->length(), "Both or none."); | |
| 4096 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
| 4097 oop obj = _objs_with_preserved_marks->at(i); | |
| 4098 markOop m = _preserved_marks_of_objs->at(i); | |
| 4099 obj->set_mark(m); | |
| 4100 } | |
|
4783
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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diff
changeset
|
4101 |
| 342 | 4102 // Delete the preserved marks growable arrays (allocated on the C heap). |
| 4103 delete _objs_with_preserved_marks; | |
| 4104 delete _preserved_marks_of_objs; | |
| 4105 _objs_with_preserved_marks = NULL; | |
| 4106 _preserved_marks_of_objs = NULL; | |
| 4107 } | |
| 4108 } | |
| 4109 | |
| 4110 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
| 4111 _evac_failure_scan_stack->push(obj); | |
| 4112 } | |
| 4113 | |
| 4114 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
| 4115 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
| 4116 | |
| 4117 while (_evac_failure_scan_stack->length() > 0) { | |
| 4118 oop obj = _evac_failure_scan_stack->pop(); | |
| 4119 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
| 4120 obj->oop_iterate_backwards(_evac_failure_closure); | |
| 4121 } | |
| 4122 } | |
| 4123 | |
| 4124 oop | |
| 4125 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
changeset
|
4126 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
|
4127 assert(obj_in_cs(old), |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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diff
changeset
|
4128 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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3317
diff
changeset
|
4129 (HeapWord*) old)); |
| 342 | 4130 markOop m = old->mark(); |
| 4131 oop forward_ptr = old->forward_to_atomic(old); | |
| 4132 if (forward_ptr == NULL) { | |
| 4133 // Forward-to-self succeeded. | |
|
3973
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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3920
diff
changeset
|
4134 |
| 342 | 4135 if (_evac_failure_closure != cl) { |
| 4136 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
| 4137 assert(!_drain_in_progress, | |
| 4138 "Should only be true while someone holds the lock."); | |
| 4139 // Set the global evac-failure closure to the current thread's. | |
| 4140 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
| 4141 set_evac_failure_closure(cl); | |
| 4142 // Now do the common part. | |
| 4143 handle_evacuation_failure_common(old, m); | |
| 4144 // Reset to NULL. | |
| 4145 set_evac_failure_closure(NULL); | |
| 4146 } else { | |
| 4147 // The lock is already held, and this is recursive. | |
| 4148 assert(_drain_in_progress, "This should only be the recursive case."); | |
| 4149 handle_evacuation_failure_common(old, m); | |
| 4150 } | |
| 4151 return old; | |
| 4152 } else { | |
|
3323
75af3e8de182
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3317
diff
changeset
|
4153 // 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 ...
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diff
changeset
|
4154 // 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 ...
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3317
diff
changeset
|
4155 // self-forwarding it (old == forward_ptr). |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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3317
diff
changeset
|
4156 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
|
4157 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 ...
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3317
diff
changeset
|
4158 "should not be in the CSet", |
|
75af3e8de182
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diff
changeset
|
4159 (HeapWord*) old, (HeapWord*) forward_ptr)); |
| 342 | 4160 return forward_ptr; |
| 4161 } | |
| 4162 } | |
| 4163 | |
| 4164 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
| 4165 set_evacuation_failed(true); | |
| 4166 | |
| 4167 preserve_mark_if_necessary(old, m); | |
| 4168 | |
| 4169 HeapRegion* r = heap_region_containing(old); | |
| 4170 if (!r->evacuation_failed()) { | |
| 4171 r->set_evacuation_failed(true); | |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
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3777
diff
changeset
|
4172 _hr_printer.evac_failure(r); |
| 342 | 4173 } |
| 4174 | |
| 4175 push_on_evac_failure_scan_stack(old); | |
| 4176 | |
| 4177 if (!_drain_in_progress) { | |
| 4178 // prevent recursion in copy_to_survivor_space() | |
| 4179 _drain_in_progress = true; | |
| 4180 drain_evac_failure_scan_stack(); | |
| 4181 _drain_in_progress = false; | |
| 4182 } | |
| 4183 } | |
| 4184 | |
| 4185 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
|
2038
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
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2037
diff
changeset
|
4186 assert(evacuation_failed(), "Oversaving!"); |
|
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
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2037
diff
changeset
|
4187 // 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
|
4188 // case of a promotion failure. |
|
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
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parents:
2037
diff
changeset
|
4189 if (m->must_be_preserved_for_promotion_failure(obj)) { |
| 342 | 4190 if (_objs_with_preserved_marks == NULL) { |
| 4191 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
| 4192 _objs_with_preserved_marks = | |
| 4193 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 4194 _preserved_marks_of_objs = | |
| 4195 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
| 4196 } | |
| 4197 _objs_with_preserved_marks->push(obj); | |
| 4198 _preserved_marks_of_objs->push(m); | |
| 4199 } | |
| 4200 } | |
| 4201 | |
| 4202 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
| 4203 size_t word_size) { | |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4204 if (purpose == GCAllocForSurvived) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4205 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
|
4206 if (result != NULL) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4207 return result; |
| 342 | 4208 } else { |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4209 // 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
|
4210 // object there. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4211 return old_attempt_allocation(word_size); |
| 342 | 4212 } |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4213 } else { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4214 assert(purpose == GCAllocForTenured, "sanity"); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4215 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
|
4216 if (result != NULL) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4217 return result; |
| 342 | 4218 } else { |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4219 // 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
|
4220 // object there. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4221 return survivor_attempt_allocation(word_size); |
| 342 | 4222 } |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4223 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4224 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4225 ShouldNotReachHere(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4226 // Trying to keep some compilers happy. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4227 return NULL; |
| 342 | 4228 } |
| 4229 | |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4230 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
|
4231 ParGCAllocBuffer(gclab_word_size), _retired(false) { } |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4232 |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4233 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, uint queue_num) |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4234 : _g1h(g1h), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4235 _refs(g1h->task_queue(queue_num)), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4236 _dcq(&g1h->dirty_card_queue_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4237 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4238 _g1_rem(g1h->g1_rem_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4239 _hash_seed(17), _queue_num(queue_num), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4240 _term_attempts(0), |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4241 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4242 _tenured_alloc_buffer(g1h->desired_plab_sz(GCAllocForTenured)), |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4243 _age_table(false), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4244 _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
|
4245 _alloc_buffer_waste(0), _undo_waste(0) { |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4246 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4247 // 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
|
4248 // non-young regions (where the age is -1) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4249 // 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
|
4250 // 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
|
4251 size_t real_length = 1 + _g1h->g1_policy()->young_cset_region_length(); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
4252 size_t array_length = PADDING_ELEM_NUM + |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4253 real_length + |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
4254 PADDING_ELEM_NUM; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4255 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
4256 if (_surviving_young_words_base == NULL) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
4257 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
|
4258 "Not enough space for young surv histo."); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4259 _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
|
4260 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
|
4261 |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4262 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4263 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4264 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4265 _start = os::elapsedTime(); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
4266 } |
| 342 | 4267 |
| 1709 | 4268 void |
| 4269 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
| 4270 { | |
| 4271 st->print_raw_cr("GC Termination Stats"); | |
| 4272 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
| 4273 " ------waste (KiB)------"); | |
| 4274 st->print_raw_cr("thr ms ms % ms % attempts" | |
| 4275 " total alloc undo"); | |
| 4276 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
| 4277 " ------- ------- -------"); | |
| 4278 } | |
| 4279 | |
| 4280 void | |
| 4281 G1ParScanThreadState::print_termination_stats(int i, | |
| 4282 outputStream* const st) const | |
| 4283 { | |
| 4284 const double elapsed_ms = elapsed_time() * 1000.0; | |
| 4285 const double s_roots_ms = strong_roots_time() * 1000.0; | |
| 4286 const double term_ms = term_time() * 1000.0; | |
| 4287 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
| 4288 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
| 4289 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
| 4290 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
| 4291 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
| 4292 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
| 4293 alloc_buffer_waste() * HeapWordSize / K, | |
| 4294 undo_waste() * HeapWordSize / K); | |
| 4295 } | |
| 4296 | |
|
1862
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|
4297 #ifdef ASSERT |
|
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|
4298 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { |
|
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|
4299 assert(ref != NULL, "invariant"); |
|
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4300 assert(UseCompressedOops, "sanity"); |
|
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|
4301 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
|
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|
4302 oop p = oopDesc::load_decode_heap_oop(ref); |
|
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|
4303 assert(_g1h->is_in_g1_reserved(p), |
|
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|
4304 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
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|
4305 return true; |
|
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|
4306 } |
|
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|
4307 |
|
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|
4308 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
|
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|
4309 assert(ref != NULL, "invariant"); |
|
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4310 if (has_partial_array_mask(ref)) { |
|
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|
4311 // Must be in the collection set--it's already been copied. |
|
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6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
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|
4312 oop p = clear_partial_array_mask(ref); |
|
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|
4313 assert(_g1h->obj_in_cs(p), |
|
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4314 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
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|
4315 } else { |
|
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|
4316 oop p = oopDesc::load_decode_heap_oop(ref); |
|
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4317 assert(_g1h->is_in_g1_reserved(p), |
|
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|
4318 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
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|
4319 } |
|
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4320 return true; |
|
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diff
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|
4321 } |
|
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|
4322 |
|
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|
4323 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
|
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4324 if (ref.is_narrow()) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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|
4325 return verify_ref((narrowOop*) ref); |
|
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|
4326 } else { |
|
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|
4327 return verify_ref((oop*) ref); |
|
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|
4328 } |
|
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|
4329 } |
|
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|
4330 #endif // ASSERT |
|
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|
4331 |
|
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|
4332 void G1ParScanThreadState::trim_queue() { |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4333 assert(_evac_cl != NULL, "not set"); |
|
4dfb2df418f2
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|
4334 assert(_evac_failure_cl != NULL, "not set"); |
|
4dfb2df418f2
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|
4335 assert(_partial_scan_cl != NULL, "not set"); |
|
4dfb2df418f2
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|
4336 |
|
1862
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|
4337 StarTask ref; |
|
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|
4338 do { |
|
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|
4339 // Drain the overflow stack first, so other threads can steal. |
|
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|
4340 while (refs()->pop_overflow(ref)) { |
|
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|
4341 deal_with_reference(ref); |
|
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|
4342 } |
|
3979
4dfb2df418f2
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|
4343 |
|
1862
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|
4344 while (refs()->pop_local(ref)) { |
|
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|
4345 deal_with_reference(ref); |
|
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|
4346 } |
|
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|
4347 } while (!refs()->is_empty()); |
|
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|
4348 } |
|
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|
4349 |
|
4787
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parents:
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|
4350 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, |
|
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|
4351 G1ParScanThreadState* par_scan_state) : |
| 342 | 4352 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), |
|
3886
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7080389: G1: refactor marking code in evacuation pause copy closures
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changeset
|
4353 _par_scan_state(par_scan_state), |
|
4836
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|
4354 _worker_id(par_scan_state->queue_num()), |
|
3886
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|
4355 _during_initial_mark(_g1->g1_policy()->during_initial_mark_pause()), |
|
eeae91c9baba
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|
4356 _mark_in_progress(_g1->mark_in_progress()) { } |
|
eeae91c9baba
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|
4357 |
| 5987 | 4358 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
| 4359 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object>::mark_object(oop obj) { | |
|
4787
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|
4360 #ifdef ASSERT |
|
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|
4361 HeapRegion* hr = _g1->heap_region_containing(obj); |
|
2ace1c4ee8da
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|
4362 assert(hr != NULL, "sanity"); |
|
2ace1c4ee8da
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diff
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|
4363 assert(!hr->in_collection_set(), "should not mark objects in the CSet"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4785
diff
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|
4364 #endif // ASSERT |
|
2ace1c4ee8da
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tonyp
parents:
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|
4365 |
|
2ace1c4ee8da
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diff
changeset
|
4366 // We know that the object is not moving so it's safe to read its size. |
|
4836
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diff
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|
4367 _cm->grayRoot(obj, (size_t) obj->size(), _worker_id); |
|
4787
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|
4368 } |
|
2ace1c4ee8da
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|
4369 |
| 5987 | 4370 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
| 4371 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> | |
| 4372 ::mark_forwarded_object(oop from_obj, oop to_obj) { | |
|
4787
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|
4373 #ifdef ASSERT |
|
2ace1c4ee8da
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|
4374 assert(from_obj->is_forwarded(), "from obj should be forwarded"); |
|
2ace1c4ee8da
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|
4375 assert(from_obj->forwardee() == to_obj, "to obj should be the forwardee"); |
|
2ace1c4ee8da
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|
4376 assert(from_obj != to_obj, "should not be self-forwarded"); |
|
2ace1c4ee8da
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|
4377 |
|
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|
4378 HeapRegion* from_hr = _g1->heap_region_containing(from_obj); |
|
2ace1c4ee8da
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|
4379 assert(from_hr != NULL, "sanity"); |
|
2ace1c4ee8da
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changeset
|
4380 assert(from_hr->in_collection_set(), "from obj should be in the CSet"); |
|
2ace1c4ee8da
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|
4381 |
|
2ace1c4ee8da
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diff
changeset
|
4382 HeapRegion* to_hr = _g1->heap_region_containing(to_obj); |
|
2ace1c4ee8da
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|
4383 assert(to_hr != NULL, "sanity"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
changeset
|
4384 assert(!to_hr->in_collection_set(), "should not mark objects in the CSet"); |
|
2ace1c4ee8da
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tonyp
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|
4385 #endif // ASSERT |
|
2ace1c4ee8da
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changeset
|
4386 |
|
2ace1c4ee8da
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|
4387 // The object might be in the process of being copied by another |
|
2ace1c4ee8da
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diff
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|
4388 // worker so we cannot trust that its to-space image is |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
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|
4389 // well-formed. So we have to read its size from its from-space |
|
2ace1c4ee8da
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diff
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|
4390 // image which we know should not be changing. |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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4834
diff
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|
4391 _cm->grayRoot(to_obj, (size_t) from_obj->size(), _worker_id); |
|
4787
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|
4392 } |
|
2ace1c4ee8da
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|
4393 |
| 5987 | 4394 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
| 4395 oop G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> | |
| 4396 ::copy_to_survivor_space(oop old) { | |
| 342 | 4397 size_t word_sz = old->size(); |
| 4398 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
| 4399 // +1 to make the -1 indexes valid... | |
| 4400 int young_index = from_region->young_index_in_cset()+1; | |
|
4787
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|
4401 assert( (from_region->is_young() && young_index > 0) || |
|
2ace1c4ee8da
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|
4402 (!from_region->is_young() && young_index == 0), "invariant" ); |
| 342 | 4403 G1CollectorPolicy* g1p = _g1->g1_policy(); |
| 4404 markOop m = old->mark(); | |
| 545 | 4405 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
| 4406 : m->age(); | |
| 4407 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
| 342 | 4408 word_sz); |
| 4409 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
| 4410 oop obj = oop(obj_ptr); | |
| 4411 | |
| 4412 if (obj_ptr == NULL) { | |
| 4413 // This will either forward-to-self, or detect that someone else has | |
| 4414 // installed a forwarding pointer. | |
| 4415 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
|
4787
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|
4416 return _g1->handle_evacuation_failure_par(cl, old); |
| 342 | 4417 } |
| 4418 | |
| 526 | 4419 // We're going to allocate linearly, so might as well prefetch ahead. |
| 4420 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
| 4421 | |
| 342 | 4422 oop forward_ptr = old->forward_to_atomic(obj); |
| 4423 if (forward_ptr == NULL) { | |
| 4424 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
| 526 | 4425 if (g1p->track_object_age(alloc_purpose)) { |
| 4426 // We could simply do obj->incr_age(). However, this causes a | |
| 4427 // performance issue. obj->incr_age() will first check whether | |
| 4428 // the object has a displaced mark by checking its mark word; | |
| 4429 // getting the mark word from the new location of the object | |
| 4430 // stalls. So, given that we already have the mark word and we | |
| 4431 // are about to install it anyway, it's better to increase the | |
| 4432 // age on the mark word, when the object does not have a | |
| 4433 // displaced mark word. We're not expecting many objects to have | |
| 4434 // a displaced marked word, so that case is not optimized | |
| 4435 // further (it could be...) and we simply call obj->incr_age(). | |
| 4436 | |
| 4437 if (m->has_displaced_mark_helper()) { | |
| 4438 // in this case, we have to install the mark word first, | |
| 4439 // otherwise obj looks to be forwarded (the old mark word, | |
| 4440 // which contains the forward pointer, was copied) | |
| 4441 obj->set_mark(m); | |
| 4442 obj->incr_age(); | |
| 4443 } else { | |
| 4444 m = m->incr_age(); | |
| 545 | 4445 obj->set_mark(m); |
| 526 | 4446 } |
| 545 | 4447 _par_scan_state->age_table()->add(obj, word_sz); |
| 4448 } else { | |
| 4449 obj->set_mark(m); | |
| 526 | 4450 } |
| 4451 | |
| 342 | 4452 size_t* surv_young_words = _par_scan_state->surviving_young_words(); |
| 4453 surv_young_words[young_index] += word_sz; | |
| 4454 | |
| 4455 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
|
4784
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diff
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|
4456 // We keep track of the next start index in the length field of |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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4783
diff
changeset
|
4457 // the to-space object. The actual length can be found in the |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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4783
diff
changeset
|
4458 // length field of the from-space object. |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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changeset
|
4459 arrayOop(obj)->set_length(0); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
4460 oop* old_p = set_partial_array_mask(old); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
4461 _par_scan_state->push_on_queue(old_p); |
| 342 | 4462 } else { |
| 526 | 4463 // No point in using the slower heap_region_containing() method, |
| 4464 // given that we know obj is in the heap. | |
| 5987 | 4465 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
| 4466 obj->oop_iterate_backwards(&_scanner); | |
| 342 | 4467 } |
| 4468 } else { | |
| 4469 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
| 4470 obj = forward_ptr; | |
| 4471 } | |
| 4472 return obj; | |
| 4473 } | |
| 4474 | |
|
3886
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|
4475 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
|
845
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|
4476 template <class T> |
|
3886
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7080389: G1: refactor marking code in evacuation pause copy closures
johnc
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|
4477 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> |
|
845
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|
4478 ::do_oop_work(T* p) { |
|
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|
4479 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 4480 assert(barrier != G1BarrierRS || obj != NULL, |
|
4787
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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changeset
|
4481 "Precondition: G1BarrierRS implies obj is non-NULL"); |
|
3886
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|
4482 |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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diff
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|
4483 assert(_worker_id == _par_scan_state->queue_num(), "sanity"); |
|
d30fa85f9994
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|
4484 |
| 526 | 4485 // here the null check is implicit in the cset_fast_test() test |
|
1261
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|
4486 if (_g1->in_cset_fast_test(obj)) { |
|
4787
2ace1c4ee8da
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|
4487 oop forwardee; |
| 526 | 4488 if (obj->is_forwarded()) { |
|
4787
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|
4489 forwardee = obj->forwardee(); |
| 526 | 4490 } else { |
|
4787
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|
4491 forwardee = copy_to_survivor_space(obj); |
| 342 | 4492 } |
|
4787
2ace1c4ee8da
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changeset
|
4493 assert(forwardee != NULL, "forwardee should not be NULL"); |
|
2ace1c4ee8da
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changeset
|
4494 oopDesc::encode_store_heap_oop(p, forwardee); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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changeset
|
4495 if (do_mark_object && forwardee != obj) { |
|
2ace1c4ee8da
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changeset
|
4496 // If the object is self-forwarded we don't need to explicitly |
|
2ace1c4ee8da
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|
4497 // mark it, the evacuation failure protocol will do so. |
|
2ace1c4ee8da
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changeset
|
4498 mark_forwarded_object(obj, forwardee); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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|
4499 } |
|
2ace1c4ee8da
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|
4500 |
| 526 | 4501 // When scanning the RS, we only care about objs in CS. |
| 4502 if (barrier == G1BarrierRS) { | |
|
4836
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|
4503 _par_scan_state->update_rs(_from, p, _worker_id); |
| 342 | 4504 } |
|
3886
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|
4505 } else { |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4506 // The object is not in collection set. If we're a root scanning |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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3869
diff
changeset
|
4507 // closure during an initial mark pause (i.e. do_mark_object will |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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parents:
3869
diff
changeset
|
4508 // be true) then attempt to mark the object. |
|
4787
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4785
diff
changeset
|
4509 if (do_mark_object && _g1->is_in_g1_reserved(obj)) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
4510 mark_object(obj); |
|
3886
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7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4511 } |
| 526 | 4512 } |
| 4513 | |
| 4514 if (barrier == G1BarrierEvac && obj != NULL) { | |
|
4836
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6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
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diff
changeset
|
4515 _par_scan_state->update_rs(_from, p, _worker_id); |
| 526 | 4516 } |
| 4517 | |
| 4518 if (do_gen_barrier && obj != NULL) { | |
| 4519 par_do_barrier(p); | |
| 4520 } | |
| 4521 } | |
| 4522 | |
|
1261
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diff
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|
4523 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
|
0414c1049f15
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iveresov
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|
4524 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
|
845
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|
4525 |
|
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changeset
|
4526 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
| 526 | 4527 assert(has_partial_array_mask(p), "invariant"); |
|
4784
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changeset
|
4528 oop from_obj = clear_partial_array_mask(p); |
|
02838862dec8
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|
4529 |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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changeset
|
4530 assert(Universe::heap()->is_in_reserved(from_obj), "must be in heap."); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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changeset
|
4531 assert(from_obj->is_objArray(), "must be obj array"); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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changeset
|
4532 objArrayOop from_obj_array = objArrayOop(from_obj); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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changeset
|
4533 // The from-space object contains the real length. |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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parents:
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changeset
|
4534 int length = from_obj_array->length(); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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4783
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changeset
|
4535 |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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parents:
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diff
changeset
|
4536 assert(from_obj->is_forwarded(), "must be forwarded"); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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parents:
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diff
changeset
|
4537 oop to_obj = from_obj->forwardee(); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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parents:
4783
diff
changeset
|
4538 assert(from_obj != to_obj, "should not be chunking self-forwarded objects"); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
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diff
changeset
|
4539 objArrayOop to_obj_array = objArrayOop(to_obj); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4540 // We keep track of the next start index in the length field of the |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4541 // to-space object. |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4542 int next_index = to_obj_array->length(); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4543 assert(0 <= next_index && next_index < length, |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4544 err_msg("invariant, next index: %d, length: %d", next_index, length)); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4545 |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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parents:
4783
diff
changeset
|
4546 int start = next_index; |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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parents:
4783
diff
changeset
|
4547 int end = length; |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4548 int remainder = end - start; |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4549 // We'll try not to push a range that's smaller than ParGCArrayScanChunk. |
| 342 | 4550 if (remainder > 2 * ParGCArrayScanChunk) { |
| 4551 end = start + ParGCArrayScanChunk; | |
|
4784
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4552 to_obj_array->set_length(end); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4553 // Push the remainder before we process the range in case another |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4554 // worker has run out of things to do and can steal it. |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4555 oop* from_obj_p = set_partial_array_mask(from_obj); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4556 _par_scan_state->push_on_queue(from_obj_p); |
| 342 | 4557 } else { |
|
4784
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4558 assert(length == end, "sanity"); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4559 // We'll process the final range for this object. Restore the length |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4560 // so that the heap remains parsable in case of evacuation failure. |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4561 to_obj_array->set_length(end); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4562 } |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4563 _scanner.set_region(_g1->heap_region_containing_raw(to_obj)); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4564 // Process indexes [start,end). It will also process the header |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4565 // along with the first chunk (i.e., the chunk with start == 0). |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4566 // Note that at this point the length field of to_obj_array is not |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4567 // correct given that we are using it to keep track of the next |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4568 // start index. oop_iterate_range() (thankfully!) ignores the length |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4569 // field and only relies on the start / end parameters. It does |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4570 // however return the size of the object which will be incorrect. So |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4571 // we have to ignore it even if we wanted to use it. |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4572 to_obj_array->oop_iterate_range(&_scanner, start, end); |
| 342 | 4573 } |
| 4574 | |
| 4575 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
| 4576 protected: | |
| 4577 G1CollectedHeap* _g1h; | |
| 4578 G1ParScanThreadState* _par_scan_state; | |
| 4579 RefToScanQueueSet* _queues; | |
| 4580 ParallelTaskTerminator* _terminator; | |
| 4581 | |
| 4582 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
| 4583 RefToScanQueueSet* queues() { return _queues; } | |
| 4584 ParallelTaskTerminator* terminator() { return _terminator; } | |
| 4585 | |
| 4586 public: | |
| 4587 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
| 4588 G1ParScanThreadState* par_scan_state, | |
| 4589 RefToScanQueueSet* queues, | |
| 4590 ParallelTaskTerminator* terminator) | |
| 4591 : _g1h(g1h), _par_scan_state(par_scan_state), | |
| 4592 _queues(queues), _terminator(terminator) {} | |
| 4593 | |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
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1861
diff
changeset
|
4594 void do_void(); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4595 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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1861
diff
changeset
|
4596 private: |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4597 inline bool offer_termination(); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4598 }; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4599 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4600 bool G1ParEvacuateFollowersClosure::offer_termination() { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4601 G1ParScanThreadState* const pss = par_scan_state(); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4602 pss->start_term_time(); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4603 const bool res = terminator()->offer_termination(); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4604 pss->end_term_time(); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4605 return res; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4606 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4607 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4608 void G1ParEvacuateFollowersClosure::do_void() { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4609 StarTask stolen_task; |
|
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4610 G1ParScanThreadState* const pss = par_scan_state(); |
|
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|
4611 pss->trim_queue(); |
|
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|
4612 |
|
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|
4613 do { |
|
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|
4614 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
|
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|
4615 assert(pss->verify_task(stolen_task), "sanity"); |
|
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|
4616 if (stolen_task.is_narrow()) { |
|
1883
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
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|
4617 pss->deal_with_reference((narrowOop*) stolen_task); |
|
1862
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|
4618 } else { |
|
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|
4619 pss->deal_with_reference((oop*) stolen_task); |
|
1862
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|
4620 } |
|
1883
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|
4621 |
|
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|
4622 // We've just processed a reference and we might have made |
|
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|
4623 // available new entries on the queues. So we have to make sure |
|
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|
4624 // we drain the queues as necessary. |
| 342 | 4625 pss->trim_queue(); |
| 4626 } | |
|
1862
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|
4627 } while (!offer_termination()); |
|
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|
4628 |
|
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|
4629 pss->retire_alloc_buffers(); |
|
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|
4630 } |
| 342 | 4631 |
| 4632 class G1ParTask : public AbstractGangTask { | |
| 4633 protected: | |
| 4634 G1CollectedHeap* _g1h; | |
| 4635 RefToScanQueueSet *_queues; | |
| 4636 ParallelTaskTerminator _terminator; | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
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|
4637 uint _n_workers; |
| 342 | 4638 |
| 4639 Mutex _stats_lock; | |
| 4640 Mutex* stats_lock() { return &_stats_lock; } | |
| 4641 | |
| 4642 size_t getNCards() { | |
| 4643 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
| 4644 / G1BlockOffsetSharedArray::N_bytes; | |
| 4645 } | |
| 4646 | |
| 4647 public: | |
|
4095
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|
4648 G1ParTask(G1CollectedHeap* g1h, |
|
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|
4649 RefToScanQueueSet *task_queues) |
| 342 | 4650 : AbstractGangTask("G1 collection"), |
| 4651 _g1h(g1h), | |
| 4652 _queues(task_queues), | |
|
4095
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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
4653 _terminator(0, _queues), |
|
bca17e38de00
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|
4654 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true) |
| 342 | 4655 {} |
| 4656 | |
| 4657 RefToScanQueueSet* queues() { return _queues; } | |
| 4658 | |
| 4659 RefToScanQueue *work_queue(int i) { | |
| 4660 return queues()->queue(i); | |
| 4661 } | |
| 4662 | |
|
4095
bca17e38de00
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|
4663 ParallelTaskTerminator* terminator() { return &_terminator; } |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
4664 |
|
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|
4665 virtual void set_for_termination(int active_workers) { |
|
bca17e38de00
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|
4666 // This task calls set_n_termination() in par_non_clean_card_iterate_work() |
|
bca17e38de00
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|
4667 // in the young space (_par_seq_tasks) in the G1 heap |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
4668 // for SequentialSubTasksDone. |
|
bca17e38de00
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changeset
|
4669 // This task also uses SubTasksDone in SharedHeap and G1CollectedHeap |
|
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changeset
|
4670 // both of which need setting by set_n_termination(). |
|
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|
4671 _g1h->SharedHeap::set_n_termination(active_workers); |
|
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|
4672 _g1h->set_n_termination(active_workers); |
|
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|
4673 terminator()->reset_for_reuse(active_workers); |
|
bca17e38de00
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|
4674 _n_workers = active_workers; |
|
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diff
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|
4675 } |
|
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diff
changeset
|
4676 |
|
4728
441e946dc1af
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4711
diff
changeset
|
4677 void work(uint worker_id) { |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
4678 if (worker_id >= _n_workers) return; // no work needed this round |
| 1611 | 4679 |
| 4680 double start_time_ms = os::elapsedTime() * 1000.0; | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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4711
diff
changeset
|
4681 _g1h->g1_policy()->record_gc_worker_start_time(worker_id, start_time_ms); |
| 1611 | 4682 |
|
5986
500023bd0818
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5963
diff
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|
4683 { |
|
500023bd0818
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5963
diff
changeset
|
4684 ResourceMark rm; |
|
500023bd0818
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5963
diff
changeset
|
4685 HandleMark hm; |
|
500023bd0818
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5963
diff
changeset
|
4686 |
|
500023bd0818
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5963
diff
changeset
|
4687 ReferenceProcessor* rp = _g1h->ref_processor_stw(); |
|
500023bd0818
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diff
changeset
|
4688 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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diff
changeset
|
4689 G1ParScanThreadState pss(_g1h, worker_id); |
|
500023bd0818
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5963
diff
changeset
|
4690 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, rp); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4691 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, rp); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4692 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, rp); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4693 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4694 pss.set_evac_closure(&scan_evac_cl); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4695 pss.set_evac_failure_closure(&evac_failure_cl); |
|
500023bd0818
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5963
diff
changeset
|
4696 pss.set_partial_scan_closure(&partial_scan_cl); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4697 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4698 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss, rp); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4699 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss, rp); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4700 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4701 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss, rp); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4702 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss, rp); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4703 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4704 OopClosure* scan_root_cl = &only_scan_root_cl; |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4705 OopsInHeapRegionClosure* scan_perm_cl = &only_scan_perm_cl; |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4706 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4707 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4708 // We also need to mark copied objects. |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4709 scan_root_cl = &scan_mark_root_cl; |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4710 scan_perm_cl = &scan_mark_perm_cl; |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4711 } |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4712 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4713 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4714 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4715 pss.start_strong_roots(); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4716 _g1h->g1_process_strong_roots(/* not collecting perm */ false, |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4717 SharedHeap::SO_AllClasses, |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4718 scan_root_cl, |
|
500023bd0818
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5963
diff
changeset
|
4719 &push_heap_rs_cl, |
|
500023bd0818
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5963
diff
changeset
|
4720 scan_perm_cl, |
|
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7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4721 worker_id); |
|
500023bd0818
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5963
diff
changeset
|
4722 pss.end_strong_roots(); |
|
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5963
diff
changeset
|
4723 |
|
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5963
diff
changeset
|
4724 { |
|
500023bd0818
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5963
diff
changeset
|
4725 double start = os::elapsedTime(); |
|
500023bd0818
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5963
diff
changeset
|
4726 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); |
|
500023bd0818
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5963
diff
changeset
|
4727 evac.do_void(); |
|
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5963
diff
changeset
|
4728 double elapsed_ms = (os::elapsedTime()-start)*1000.0; |
|
500023bd0818
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5963
diff
changeset
|
4729 double term_ms = pss.term_time()*1000.0; |
|
500023bd0818
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5963
diff
changeset
|
4730 _g1h->g1_policy()->record_obj_copy_time(worker_id, elapsed_ms-term_ms); |
|
500023bd0818
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5963
diff
changeset
|
4731 _g1h->g1_policy()->record_termination(worker_id, term_ms, pss.term_attempts()); |
|
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diff
changeset
|
4732 } |
|
500023bd0818
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5963
diff
changeset
|
4733 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
|
500023bd0818
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5963
diff
changeset
|
4734 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
|
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diff
changeset
|
4735 |
|
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diff
changeset
|
4736 // Clean up any par-expanded rem sets. |
|
500023bd0818
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diff
changeset
|
4737 HeapRegionRemSet::par_cleanup(); |
|
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5963
diff
changeset
|
4738 |
|
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5963
diff
changeset
|
4739 if (ParallelGCVerbose) { |
|
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5963
diff
changeset
|
4740 MutexLocker x(stats_lock()); |
|
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diff
changeset
|
4741 pss.print_termination_stats(worker_id); |
|
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diff
changeset
|
4742 } |
|
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diff
changeset
|
4743 |
|
500023bd0818
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diff
changeset
|
4744 assert(pss.refs()->is_empty(), "should be empty"); |
|
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diff
changeset
|
4745 |
|
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diff
changeset
|
4746 // Close the inner scope so that the ResourceMark and HandleMark |
|
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5963
diff
changeset
|
4747 // destructors are executed here and are included as part of the |
|
500023bd0818
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5963
diff
changeset
|
4748 // "GC Worker Time". |
| 342 | 4749 } |
| 4750 | |
| 1611 | 4751 double end_time_ms = os::elapsedTime() * 1000.0; |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
4752 _g1h->g1_policy()->record_gc_worker_end_time(worker_id, end_time_ms); |
| 342 | 4753 } |
| 4754 }; | |
| 4755 | |
| 4756 // *** Common G1 Evacuation Stuff | |
| 4757 | |
|
5986
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|
4758 // Closures that support the filtering of CodeBlobs scanned during |
|
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5963
diff
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|
4759 // external root scanning. |
|
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7143511: G1: Another instance of high GC Worker Other time (50ms)
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changeset
|
4760 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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diff
changeset
|
4761 // Closure applied to reference fields in code blobs (specifically nmethods) |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4762 // to determine whether an nmethod contains references that point into |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
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changeset
|
4763 // the collection set. Used as a predicate when walking code roots so |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4764 // that only nmethods that point into the collection set are added to the |
|
500023bd0818
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5963
diff
changeset
|
4765 // 'marked' list. |
|
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7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4766 |
|
500023bd0818
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parents:
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diff
changeset
|
4767 class G1FilteredCodeBlobToOopClosure : public CodeBlobToOopClosure { |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
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changeset
|
4768 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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diff
changeset
|
4769 class G1PointsIntoCSOopClosure : public OopClosure { |
|
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|
4770 G1CollectedHeap* _g1; |
|
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|
4771 bool _points_into_cs; |
|
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|
4772 public: |
|
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5963
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changeset
|
4773 G1PointsIntoCSOopClosure(G1CollectedHeap* g1) : |
|
500023bd0818
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changeset
|
4774 _g1(g1), _points_into_cs(false) { } |
|
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5963
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|
4775 |
|
500023bd0818
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diff
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|
4776 bool points_into_cs() const { return _points_into_cs; } |
|
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|
4777 |
|
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diff
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|
4778 template <class T> |
|
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diff
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|
4779 void do_oop_nv(T* p) { |
|
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diff
changeset
|
4780 if (!_points_into_cs) { |
|
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diff
changeset
|
4781 T heap_oop = oopDesc::load_heap_oop(p); |
|
500023bd0818
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diff
changeset
|
4782 if (!oopDesc::is_null(heap_oop) && |
|
500023bd0818
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5963
diff
changeset
|
4783 _g1->in_cset_fast_test(oopDesc::decode_heap_oop_not_null(heap_oop))) { |
|
500023bd0818
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5963
diff
changeset
|
4784 _points_into_cs = true; |
|
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parents:
5963
diff
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|
4785 } |
|
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diff
changeset
|
4786 } |
|
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5963
diff
changeset
|
4787 } |
|
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parents:
5963
diff
changeset
|
4788 |
|
500023bd0818
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parents:
5963
diff
changeset
|
4789 virtual void do_oop(oop* p) { do_oop_nv(p); } |
|
500023bd0818
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parents:
5963
diff
changeset
|
4790 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } |
|
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5963
diff
changeset
|
4791 }; |
|
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5963
diff
changeset
|
4792 |
|
500023bd0818
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parents:
5963
diff
changeset
|
4793 G1CollectedHeap* _g1; |
|
500023bd0818
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parents:
5963
diff
changeset
|
4794 |
|
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parents:
5963
diff
changeset
|
4795 public: |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4796 G1FilteredCodeBlobToOopClosure(G1CollectedHeap* g1, OopClosure* cl) : |
|
500023bd0818
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parents:
5963
diff
changeset
|
4797 CodeBlobToOopClosure(cl, true), _g1(g1) { } |
|
500023bd0818
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5963
diff
changeset
|
4798 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4799 virtual void do_code_blob(CodeBlob* cb) { |
|
500023bd0818
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parents:
5963
diff
changeset
|
4800 nmethod* nm = cb->as_nmethod_or_null(); |
|
500023bd0818
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parents:
5963
diff
changeset
|
4801 if (nm != NULL && !(nm->test_oops_do_mark())) { |
|
500023bd0818
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parents:
5963
diff
changeset
|
4802 G1PointsIntoCSOopClosure predicate_cl(_g1); |
|
500023bd0818
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parents:
5963
diff
changeset
|
4803 nm->oops_do(&predicate_cl); |
|
500023bd0818
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parents:
5963
diff
changeset
|
4804 |
|
500023bd0818
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parents:
5963
diff
changeset
|
4805 if (predicate_cl.points_into_cs()) { |
|
500023bd0818
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parents:
5963
diff
changeset
|
4806 // At least one of the reference fields or the oop relocations |
|
500023bd0818
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parents:
5963
diff
changeset
|
4807 // in the nmethod points into the collection set. We have to |
|
500023bd0818
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parents:
5963
diff
changeset
|
4808 // 'mark' this nmethod. |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4809 // Note: Revisit the following if CodeBlobToOopClosure::do_code_blob() |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4810 // or MarkingCodeBlobClosure::do_code_blob() change. |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4811 if (!nm->test_set_oops_do_mark()) { |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4812 do_newly_marked_nmethod(nm); |
|
500023bd0818
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johnc
parents:
5963
diff
changeset
|
4813 } |
|
500023bd0818
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johnc
parents:
5963
diff
changeset
|
4814 } |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4815 } |
|
500023bd0818
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johnc
parents:
5963
diff
changeset
|
4816 } |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4817 }; |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4818 |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
4819 // This method is run in a GC worker. |
|
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
4820 |
| 342 | 4821 void |
| 4822 G1CollectedHeap:: | |
| 4823 g1_process_strong_roots(bool collecting_perm_gen, | |
|
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
4824 ScanningOption so, |
| 342 | 4825 OopClosure* scan_non_heap_roots, |
| 4826 OopsInHeapRegionClosure* scan_rs, | |
| 4827 OopsInGenClosure* scan_perm, | |
| 4828 int worker_i) { | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4829 |
| 342 | 4830 // First scan the strong roots, including the perm gen. |
| 4831 double ext_roots_start = os::elapsedTime(); | |
| 4832 double closure_app_time_sec = 0.0; | |
| 4833 | |
| 4834 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
| 4835 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
| 4836 buf_scan_perm.set_generation(perm_gen()); | |
| 4837 | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4838 // Walk the code cache w/o buffering, because StarTask cannot handle |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4839 // unaligned oop locations. |
|
5986
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4840 G1FilteredCodeBlobToOopClosure eager_scan_code_roots(this, scan_non_heap_roots); |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4841 |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4842 process_strong_roots(false, // no scoping; this is parallel code |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4843 collecting_perm_gen, so, |
| 342 | 4844 &buf_scan_non_heap_roots, |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4845 &eager_scan_code_roots, |
| 342 | 4846 &buf_scan_perm); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4847 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4848 // Now the CM ref_processor roots. |
|
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4849 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4850 // We need to treat the discovered reference lists of the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4851 // concurrent mark ref processor as roots and keep entries |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4852 // (which are added by the marking threads) on them live |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4853 // until they can be processed at the end of marking. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4854 ref_processor_cm()->weak_oops_do(&buf_scan_non_heap_roots); |
|
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4855 } |
|
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4856 |
|
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4857 // Finish up any enqueued closure apps (attributed as object copy time). |
| 342 | 4858 buf_scan_non_heap_roots.done(); |
| 4859 buf_scan_perm.done(); | |
|
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4860 |
| 342 | 4861 double ext_roots_end = os::elapsedTime(); |
|
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
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3778
diff
changeset
|
4862 |
| 342 | 4863 g1_policy()->reset_obj_copy_time(worker_i); |
|
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4864 double obj_copy_time_sec = buf_scan_perm.closure_app_seconds() + |
|
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4865 buf_scan_non_heap_roots.closure_app_seconds(); |
| 342 | 4866 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); |
|
3823
14a2fd14c0db
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johnc
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3778
diff
changeset
|
4867 |
| 342 | 4868 double ext_root_time_ms = |
| 4869 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
|
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
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3778
diff
changeset
|
4870 |
| 342 | 4871 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); |
| 4872 | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4873 // 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
|
4874 // 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
|
4875 // as implicitly live). |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4876 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
|
4877 if (mark_in_progress()) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4878 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
|
4879 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4880 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4881 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
|
4882 g1_policy()->record_satb_filtering_time(worker_i, satb_filtering_ms); |
| 342 | 4883 |
| 4884 // Now scan the complement of the collection set. | |
| 4885 if (scan_rs != NULL) { | |
| 4886 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
| 4887 } | |
|
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
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3778
diff
changeset
|
4888 |
| 342 | 4889 _process_strong_tasks->all_tasks_completed(); |
| 4890 } | |
| 4891 | |
| 4892 void | |
| 4893 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
| 4894 OopClosure* non_root_closure) { | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4895 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4896 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
| 342 | 4897 } |
| 4898 | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4899 // Weak Reference Processing support |
|
4dfb2df418f2
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changeset
|
4900 |
|
4dfb2df418f2
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diff
changeset
|
4901 // An always "is_alive" closure that is used to preserve referents. |
|
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|
4902 // If the object is non-null then it's alive. Used in the preservation |
|
4dfb2df418f2
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diff
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|
4903 // of referent objects that are pointed to by reference objects |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4904 // discovered by the CM ref processor. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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changeset
|
4905 class G1AlwaysAliveClosure: public BoolObjectClosure { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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changeset
|
4906 G1CollectedHeap* _g1; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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changeset
|
4907 public: |
|
4dfb2df418f2
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parents:
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changeset
|
4908 G1AlwaysAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
|
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|
4909 void do_object(oop p) { assert(false, "Do not call."); } |
|
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|
4910 bool do_object_b(oop p) { |
|
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diff
changeset
|
4911 if (p != NULL) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4912 return true; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4913 } |
|
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parents:
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|
4914 return false; |
|
4dfb2df418f2
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parents:
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diff
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|
4915 } |
|
4dfb2df418f2
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parents:
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diff
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|
4916 }; |
|
4dfb2df418f2
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changeset
|
4917 |
|
4dfb2df418f2
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changeset
|
4918 bool G1STWIsAliveClosure::do_object_b(oop p) { |
|
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|
4919 // An object is reachable if it is outside the collection set, |
|
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|
4920 // or is inside and copied. |
|
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|
4921 return !_g1->obj_in_cs(p) || p->is_forwarded(); |
|
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parents:
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|
4922 } |
|
4dfb2df418f2
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changeset
|
4923 |
|
4dfb2df418f2
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diff
changeset
|
4924 // Non Copying Keep Alive closure |
|
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|
4925 class G1KeepAliveClosure: public OopClosure { |
|
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|
4926 G1CollectedHeap* _g1; |
|
4dfb2df418f2
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|
4927 public: |
|
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parents:
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changeset
|
4928 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
|
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|
4929 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
|
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|
4930 void do_oop( oop* p) { |
|
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|
4931 oop obj = *p; |
|
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6484982: G1: process references during evacuation pauses
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parents:
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changeset
|
4932 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4933 if (_g1->obj_in_cs(obj)) { |
|
4dfb2df418f2
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|
4934 assert( obj->is_forwarded(), "invariant" ); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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changeset
|
4935 *p = obj->forwardee(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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changeset
|
4936 } |
|
4dfb2df418f2
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parents:
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changeset
|
4937 } |
|
4dfb2df418f2
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parents:
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changeset
|
4938 }; |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4939 |
|
4dfb2df418f2
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parents:
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changeset
|
4940 // Copying Keep Alive closure - can be called from both |
|
4dfb2df418f2
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|
4941 // serial and parallel code as long as different worker |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4942 // threads utilize different G1ParScanThreadState instances |
|
4dfb2df418f2
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parents:
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changeset
|
4943 // and different queues. |
|
4dfb2df418f2
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parents:
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changeset
|
4944 |
|
4dfb2df418f2
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parents:
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changeset
|
4945 class G1CopyingKeepAliveClosure: public OopClosure { |
|
4dfb2df418f2
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|
4946 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
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parents:
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|
4947 OopClosure* _copy_non_heap_obj_cl; |
|
4dfb2df418f2
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parents:
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|
4948 OopsInHeapRegionClosure* _copy_perm_obj_cl; |
|
4dfb2df418f2
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changeset
|
4949 G1ParScanThreadState* _par_scan_state; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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changeset
|
4950 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4951 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4952 G1CopyingKeepAliveClosure(G1CollectedHeap* g1h, |
|
4dfb2df418f2
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|
4953 OopClosure* non_heap_obj_cl, |
|
4dfb2df418f2
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|
4954 OopsInHeapRegionClosure* perm_obj_cl, |
|
4dfb2df418f2
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changeset
|
4955 G1ParScanThreadState* pss): |
|
4dfb2df418f2
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changeset
|
4956 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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changeset
|
4957 _copy_non_heap_obj_cl(non_heap_obj_cl), |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4958 _copy_perm_obj_cl(perm_obj_cl), |
|
4dfb2df418f2
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|
4959 _par_scan_state(pss) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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changeset
|
4960 {} |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4961 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4962 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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changeset
|
4963 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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changeset
|
4964 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4965 template <class T> void do_oop_work(T* p) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4966 oop obj = oopDesc::load_decode_heap_oop(p); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4967 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4968 if (_g1h->obj_in_cs(obj)) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4969 // If the referent object has been forwarded (either copied |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4970 // to a new location or to itself in the event of an |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4971 // evacuation failure) then we need to update the reference |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4972 // field and, if both reference and referent are in the G1 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4973 // heap, update the RSet for the referent. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4974 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4975 // If the referent has not been forwarded then we have to keep |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4976 // it alive by policy. Therefore we have copy the referent. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4977 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4978 // If the reference field is in the G1 heap then we can push |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4979 // on the PSS queue. When the queue is drained (after each |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4980 // phase of reference processing) the object and it's followers |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4981 // 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
|
4982 // new location, and the RSet updated. Otherwise we need to |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4983 // use the the non-heap or perm closures directly to copy |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4984 // the refernt object and update the pointer, while avoiding |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4985 // updating the RSet. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4986 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4987 if (_g1h->is_in_g1_reserved(p)) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4988 _par_scan_state->push_on_queue(p); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4989 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4990 // 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
|
4991 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
|
4992 _copy_perm_obj_cl->do_oop(p); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4993 } else { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4994 _copy_non_heap_obj_cl->do_oop(p); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4995 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4996 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4997 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4998 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4999 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5000 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5001 // Serial drain queue closure. Called as the 'complete_gc' |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5002 // closure for each discovered list in some of the |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5003 // reference processing phases. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5004 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5005 class G1STWDrainQueueClosure: public VoidClosure { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5006 protected: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5007 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5008 G1ParScanThreadState* _par_scan_state; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5009 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5010 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5011 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
5012 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5013 G1STWDrainQueueClosure(G1CollectedHeap* g1h, G1ParScanThreadState* pss) : |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5014 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5015 _par_scan_state(pss) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5016 { } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5017 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5018 void do_void() { |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5019 G1ParScanThreadState* const pss = par_scan_state(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5020 pss->trim_queue(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5021 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5022 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5023 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5024 // Parallel Reference Processing closures |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5025 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5026 // Implementation of AbstractRefProcTaskExecutor for parallel reference |
|
4dfb2df418f2
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parents:
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changeset
|
5027 // processing during G1 evacuation pauses. |
|
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parents:
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diff
changeset
|
5028 |
|
4dfb2df418f2
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changeset
|
5029 class G1STWRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
|
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|
5030 private: |
|
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|
5031 G1CollectedHeap* _g1h; |
|
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|
5032 RefToScanQueueSet* _queues; |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
5033 FlexibleWorkGang* _workers; |
|
3979
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|
5034 int _active_workers; |
|
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parents:
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diff
changeset
|
5035 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5036 public: |
|
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|
5037 G1STWRefProcTaskExecutor(G1CollectedHeap* g1h, |
|
4095
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|
5038 FlexibleWorkGang* workers, |
|
3979
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|
5039 RefToScanQueueSet *task_queues, |
|
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|
5040 int n_workers) : |
|
4dfb2df418f2
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diff
changeset
|
5041 _g1h(g1h), |
|
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parents:
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diff
changeset
|
5042 _queues(task_queues), |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5043 _workers(workers), |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5044 _active_workers(n_workers) |
|
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parents:
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changeset
|
5045 { |
|
4dfb2df418f2
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diff
changeset
|
5046 assert(n_workers > 0, "shouldn't call this otherwise"); |
|
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|
5047 } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5048 |
|
4dfb2df418f2
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|
5049 // Executes the given task using concurrent marking worker threads. |
|
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|
5050 virtual void execute(ProcessTask& task); |
|
4dfb2df418f2
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parents:
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|
5051 virtual void execute(EnqueueTask& task); |
|
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parents:
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|
5052 }; |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5053 |
|
4dfb2df418f2
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changeset
|
5054 // Gang task for possibly parallel reference processing |
|
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parents:
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diff
changeset
|
5055 |
|
4dfb2df418f2
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|
5056 class G1STWRefProcTaskProxy: public AbstractGangTask { |
|
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|
5057 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
|
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|
5058 ProcessTask& _proc_task; |
|
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|
5059 G1CollectedHeap* _g1h; |
|
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|
5060 RefToScanQueueSet *_task_queues; |
|
4dfb2df418f2
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|
5061 ParallelTaskTerminator* _terminator; |
|
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changeset
|
5062 |
|
4dfb2df418f2
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parents:
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changeset
|
5063 public: |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5064 G1STWRefProcTaskProxy(ProcessTask& proc_task, |
|
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|
5065 G1CollectedHeap* g1h, |
|
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|
5066 RefToScanQueueSet *task_queues, |
|
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|
5067 ParallelTaskTerminator* terminator) : |
|
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|
5068 AbstractGangTask("Process reference objects in parallel"), |
|
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parents:
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diff
changeset
|
5069 _proc_task(proc_task), |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5070 _g1h(g1h), |
|
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parents:
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diff
changeset
|
5071 _task_queues(task_queues), |
|
4dfb2df418f2
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parents:
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changeset
|
5072 _terminator(terminator) |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5073 {} |
|
4dfb2df418f2
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parents:
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changeset
|
5074 |
|
4728
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|
5075 virtual void work(uint worker_id) { |
|
3979
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|
5076 // The reference processing task executed by a single worker. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5077 ResourceMark rm; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5078 HandleMark hm; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5079 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5080 G1STWIsAliveClosure is_alive(_g1h); |
|
4dfb2df418f2
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|
5081 |
|
4728
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|
5082 G1ParScanThreadState pss(_g1h, worker_id); |
|
3979
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parents:
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changeset
|
5083 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5084 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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|
5085 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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parents:
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diff
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|
5086 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5087 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5088 pss.set_evac_closure(&scan_evac_cl); |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5089 pss.set_evac_failure_closure(&evac_failure_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5090 pss.set_partial_scan_closure(&partial_scan_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5091 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5092 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
5093 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5094 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5095 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5096 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5097 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5098 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5099 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5100 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5101 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5102 // We also need to mark copied objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5103 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5104 copy_perm_cl = ©_mark_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5105 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5106 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5107 // Keep alive closure. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5108 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5109 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5110 // Complete GC closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5111 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _task_queues, _terminator); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5112 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5113 // Call the reference processing task's work routine. |
|
4728
441e946dc1af
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jmasa
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4711
diff
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|
5114 _proc_task.work(worker_id, is_alive, keep_alive, drain_queue); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5115 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5116 // Note we cannot assert that the refs array is empty here as not all |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5117 // of the processing tasks (specifically phase2 - pp2_work) execute |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5118 // the complete_gc closure (which ordinarily would drain the queue) so |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5119 // the queue may not be empty. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5120 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5121 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5122 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5123 // Driver routine for parallel reference processing. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5124 // Creates an instance of the ref processing gang |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5125 // task and has the worker threads execute it. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5126 void G1STWRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
|
4dfb2df418f2
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diff
changeset
|
5127 assert(_workers != NULL, "Need parallel worker threads."); |
|
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 ParallelTaskTerminator terminator(_active_workers, _queues); |
|
4dfb2df418f2
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diff
changeset
|
5130 G1STWRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _queues, &terminator); |
|
4dfb2df418f2
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changeset
|
5131 |
|
4dfb2df418f2
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diff
changeset
|
5132 _g1h->set_par_threads(_active_workers); |
|
4dfb2df418f2
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diff
changeset
|
5133 _workers->run_task(&proc_task_proxy); |
|
4dfb2df418f2
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diff
changeset
|
5134 _g1h->set_par_threads(0); |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5135 } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5136 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5137 // Gang task for parallel reference enqueueing. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5138 |
|
4dfb2df418f2
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diff
changeset
|
5139 class G1STWRefEnqueueTaskProxy: public AbstractGangTask { |
|
4dfb2df418f2
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diff
changeset
|
5140 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
|
4dfb2df418f2
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diff
changeset
|
5141 EnqueueTask& _enq_task; |
|
4dfb2df418f2
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diff
changeset
|
5142 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5143 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5144 G1STWRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
|
4dfb2df418f2
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diff
changeset
|
5145 AbstractGangTask("Enqueue reference objects in parallel"), |
|
4dfb2df418f2
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diff
changeset
|
5146 _enq_task(enq_task) |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5147 { } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5148 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
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diff
changeset
|
5149 virtual void work(uint worker_id) { |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
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diff
changeset
|
5150 _enq_task.work(worker_id); |
|
3979
4dfb2df418f2
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changeset
|
5151 } |
|
4dfb2df418f2
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|
5152 }; |
|
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|
5153 |
|
4dfb2df418f2
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|
5154 // Driver routine for parallel reference enqueing. |
|
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|
5155 // Creates an instance of the ref enqueueing gang |
|
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|
5156 // task and has the worker threads execute it. |
|
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|
5157 |
|
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|
5158 void G1STWRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
|
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|
5159 assert(_workers != NULL, "Need parallel worker threads."); |
|
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|
5160 |
|
4dfb2df418f2
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diff
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|
5161 G1STWRefEnqueueTaskProxy enq_task_proxy(enq_task); |
|
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|
5162 |
|
4dfb2df418f2
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|
5163 _g1h->set_par_threads(_active_workers); |
|
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|
5164 _workers->run_task(&enq_task_proxy); |
|
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|
5165 _g1h->set_par_threads(0); |
|
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|
5166 } |
|
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|
5167 |
|
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|
5168 // End of weak reference support closures |
|
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|
5169 |
|
4dfb2df418f2
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|
5170 // Abstract task used to preserve (i.e. copy) any referent objects |
|
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|
5171 // that are in the collection set and are pointed to by reference |
|
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|
5172 // objects discovered by the CM ref processor. |
|
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|
5173 |
|
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|
5174 class G1ParPreserveCMReferentsTask: public AbstractGangTask { |
|
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|
5175 protected: |
|
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|
5176 G1CollectedHeap* _g1h; |
|
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|
5177 RefToScanQueueSet *_queues; |
|
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|
5178 ParallelTaskTerminator _terminator; |
|
4728
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|
5179 uint _n_workers; |
|
3979
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|
5180 |
|
4dfb2df418f2
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|
5181 public: |
|
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|
5182 G1ParPreserveCMReferentsTask(G1CollectedHeap* g1h,int workers, RefToScanQueueSet *task_queues) : |
|
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|
5183 AbstractGangTask("ParPreserveCMReferents"), |
|
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|
5184 _g1h(g1h), |
|
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|
5185 _queues(task_queues), |
|
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|
5186 _terminator(workers, _queues), |
|
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|
5187 _n_workers(workers) |
|
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|
5188 { } |
|
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|
5189 |
|
4728
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|
5190 void work(uint worker_id) { |
|
3979
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|
5191 ResourceMark rm; |
|
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|
5192 HandleMark hm; |
|
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|
5193 |
|
4728
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|
5194 G1ParScanThreadState pss(_g1h, worker_id); |
|
3979
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|
5195 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
|
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|
5196 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
|
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|
5197 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
|
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|
5198 |
|
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|
5199 pss.set_evac_closure(&scan_evac_cl); |
|
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|
5200 pss.set_evac_failure_closure(&evac_failure_cl); |
|
4dfb2df418f2
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|
5201 pss.set_partial_scan_closure(&partial_scan_cl); |
|
4dfb2df418f2
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|
5202 |
|
4dfb2df418f2
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changeset
|
5203 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
|
4dfb2df418f2
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changeset
|
5204 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5205 |
|
4dfb2df418f2
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diff
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|
5206 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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|
5207 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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changeset
|
5208 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5209 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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|
5210 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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changeset
|
5211 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5212 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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changeset
|
5213 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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|
5214 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5215 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
5216 // We also need to mark copied objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5217 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
4dfb2df418f2
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diff
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|
5218 copy_perm_cl = ©_mark_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5219 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5220 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5221 // Is alive closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5222 G1AlwaysAliveClosure always_alive(_g1h); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5223 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5224 // Copying keep alive closure. Applied to referent objects that need |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5225 // to be copied. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5226 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5227 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5228 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5229 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5230 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
parents:
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diff
changeset
|
5231 uint stride = MIN2(MAX2(_n_workers, 1U), limit); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5232 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5233 // limit is set using max_num_q() - which was set using ParallelGCThreads. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5234 // So this must be true - but assert just in case someone decides to |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5235 // change the worker ids. |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5236 assert(0 <= worker_id && worker_id < limit, "sanity"); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5237 assert(!rp->discovery_is_atomic(), "check this code"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5238 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5239 // Select discovered lists [i, i+stride, i+2*stride,...,limit) |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5240 for (uint idx = worker_id; idx < limit; idx += stride) { |
|
4014
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
4013
diff
changeset
|
5241 DiscoveredList& ref_list = rp->discovered_refs()[idx]; |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5242 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5243 DiscoveredListIterator iter(ref_list, &keep_alive, &always_alive); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5244 while (iter.has_next()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5245 // Since discovery is not atomic for the CM ref processor, we |
|
4dfb2df418f2
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diff
changeset
|
5246 // can see some null referent objects. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5247 iter.load_ptrs(DEBUG_ONLY(true)); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5248 oop ref = iter.obj(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5249 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5250 // This will filter nulls. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5251 if (iter.is_referent_alive()) { |
|
4dfb2df418f2
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diff
changeset
|
5252 iter.make_referent_alive(); |
|
4dfb2df418f2
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diff
changeset
|
5253 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5254 iter.move_to_next(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5255 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5256 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5257 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5258 // Drain the queue - which may cause stealing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5259 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _queues, &_terminator); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5260 drain_queue.do_void(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5261 // Allocation buffers were retired at the end of G1ParEvacuateFollowersClosure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5262 assert(pss.refs()->is_empty(), "should be"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5263 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5264 }; |
|
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5265 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5266 // Weak Reference processing during an evacuation pause (part 1). |
|
4dfb2df418f2
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diff
changeset
|
5267 void G1CollectedHeap::process_discovered_references() { |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5268 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
|
5269 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5270 ReferenceProcessor* rp = _ref_processor_stw; |
|
4dfb2df418f2
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diff
changeset
|
5271 assert(rp->discovery_enabled(), "should have been enabled"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5272 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5273 // 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
|
5274 // by the CM ref processor should have already been copied (either by |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5275 // applying the external root copy closure to the discovered lists, or |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5276 // by following an RSet entry). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5277 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5278 // But some of the referents, that are in the collection set, that these |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5279 // reference objects point to may not have been copied: the STW ref |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5280 // processor would have seen that the reference object had already |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5281 // been 'discovered' and would have skipped discovering the reference, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5282 // 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
|
5283 // 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
|
5284 // referent object. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5285 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5286 // We need to explicitly copy these referent objects - the references |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5287 // will be processed at the end of remarking. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5288 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5289 // 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
|
5290 // 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
|
5291 // referents points to another object which is also referenced by an |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5292 // object discovered by the STW ref processor. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5293 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5294 uint active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5295 workers()->active_workers() : 1); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5296 |
| 4711 | 5297 assert(!G1CollectedHeap::use_parallel_gc_threads() || |
| 5298 active_workers == workers()->active_workers(), | |
| 5299 "Need to reset active_workers"); | |
| 5300 | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5301 set_par_threads(active_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5302 G1ParPreserveCMReferentsTask keep_cm_referents(this, active_workers, _task_queues); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5303 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5304 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5305 workers()->run_task(&keep_cm_referents); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5306 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5307 keep_cm_referents.work(0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5308 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5309 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5310 set_par_threads(0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5311 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5312 // Closure to test whether a referent is alive. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5313 G1STWIsAliveClosure is_alive(this); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5314 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5315 // Even when parallel reference processing is enabled, the processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5316 // 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
|
5317 // 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
|
5318 // JNI refs. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5319 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5320 // Use only a single queue for this PSS. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5321 G1ParScanThreadState pss(this, 0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5322 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5323 // We do not embed a reference processor in the copying/scanning |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5324 // closures while we're actually processing the discovered |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5325 // reference objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5326 G1ParScanHeapEvacClosure scan_evac_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5327 G1ParScanHeapEvacFailureClosure evac_failure_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5328 G1ParScanPartialArrayClosure partial_scan_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5329 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5330 pss.set_evac_closure(&scan_evac_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5331 pss.set_evac_failure_closure(&evac_failure_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5332 pss.set_partial_scan_closure(&partial_scan_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5333 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5334 assert(pss.refs()->is_empty(), "pre-condition"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5335 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5336 G1ParScanExtRootClosure only_copy_non_heap_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5337 G1ParScanPermClosure only_copy_perm_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5338 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5339 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5340 G1ParScanAndMarkPermClosure copy_mark_perm_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5341 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5342 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5343 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5344 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5345 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5346 // We also need to mark copied objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5347 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5348 copy_perm_cl = ©_mark_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5349 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5350 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5351 // Keep alive closure. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5352 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
|
5353 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5354 // Serial Complete GC closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5355 G1STWDrainQueueClosure drain_queue(this, &pss); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5356 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5357 // Setup the soft refs policy... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5358 rp->setup_policy(false); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5359 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5360 if (!rp->processing_is_mt()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5361 // Serial reference processing... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5362 rp->process_discovered_references(&is_alive, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5363 &keep_alive, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5364 &drain_queue, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5365 NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5366 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5367 // Parallel reference processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5368 assert(rp->num_q() == active_workers, "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5369 assert(active_workers <= rp->max_num_q(), "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5370 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5371 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5372 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
|
5373 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5374 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5375 // We have completed copying any necessary live referent objects |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5376 // (that were not copied during the actual pause) so we can |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5377 // retire any active alloc buffers |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5378 pss.retire_alloc_buffers(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5379 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
|
5380 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5381 double ref_proc_time = os::elapsedTime() - ref_proc_start; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5382 g1_policy()->record_ref_proc_time(ref_proc_time * 1000.0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5383 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5384 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5385 // Weak Reference processing during an evacuation pause (part 2). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5386 void G1CollectedHeap::enqueue_discovered_references() { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5387 double ref_enq_start = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5388 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5389 ReferenceProcessor* rp = _ref_processor_stw; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5390 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
|
5391 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5392 // Now enqueue any remaining on the discovered lists on to |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5393 // the pending list. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5394 if (!rp->processing_is_mt()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5395 // Serial reference processing... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5396 rp->enqueue_discovered_references(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5397 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5398 // Parallel reference enqueuing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5399 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5400 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
|
5401 assert(active_workers == workers()->active_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5402 "Need to reset active_workers"); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5403 assert(rp->num_q() == active_workers, "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5404 assert(active_workers <= rp->max_num_q(), "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5405 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5406 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5407 rp->enqueue_discovered_references(&par_task_executor); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5408 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5409 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5410 rp->verify_no_references_recorded(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5411 assert(!rp->discovery_enabled(), "should have been disabled"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5412 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5413 // FIXME |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5414 // 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
|
5415 // 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
|
5416 // and could signicantly increase the pause time. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5417 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5418 double ref_enq_time = os::elapsedTime() - ref_enq_start; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5419 g1_policy()->record_ref_enq_time(ref_enq_time * 1000.0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5420 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5421 |
| 342 | 5422 void G1CollectedHeap::evacuate_collection_set() { |
|
4781
bacb651cf5bf
7113006: G1: excessive ergo output when an evac failure happens
tonyp
parents:
4728
diff
changeset
|
5423 _expand_heap_after_alloc_failure = true; |
| 342 | 5424 set_evacuation_failed(false); |
| 5425 | |
| 5426 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
| 5427 concurrent_g1_refine()->set_use_cache(false); | |
| 889 | 5428 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
| 5429 | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5430 uint n_workers; |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5431 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5432 n_workers = |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5433 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5434 workers()->active_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5435 Threads::number_of_non_daemon_threads()); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5436 assert(UseDynamicNumberOfGCThreads || |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5437 n_workers == workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5438 "If not dynamic should be using all the workers"); |
| 4711 | 5439 workers()->set_active_workers(n_workers); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
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|
5440 set_par_threads(n_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5441 } else { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5442 assert(n_par_threads() == 0, |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5443 "Should be the original non-parallel value"); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5444 n_workers = 1; |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
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|
5445 } |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5446 |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
5447 G1ParTask g1_par_task(this, _task_queues); |
| 342 | 5448 |
| 5449 init_for_evac_failure(NULL); | |
| 5450 | |
| 5451 rem_set()->prepare_for_younger_refs_iterate(true); | |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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parents:
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diff
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|
5452 |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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parents:
595
diff
changeset
|
5453 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
|
5986
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5454 double start_par_time_sec = os::elapsedTime(); |
|
500023bd0818
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johnc
parents:
5963
diff
changeset
|
5455 double end_par_time_sec; |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5456 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5457 { |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5458 StrongRootsScope srs(this); |
|
5986
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5459 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5460 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5461 // The individual threads will set their evac-failure closures. |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5462 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5463 // These tasks use ShareHeap::_process_strong_tasks |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5464 assert(UseDynamicNumberOfGCThreads || |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5465 workers()->active_workers() == workers()->total_workers(), |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5466 "If not dynamic should be using all the workers"); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5467 workers()->run_task(&g1_par_task); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5468 } else { |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5469 g1_par_task.set_for_termination(n_workers); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5470 g1_par_task.work(0); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5471 } |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5472 end_par_time_sec = os::elapsedTime(); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5473 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5474 // Closing the inner scope will execute the destructor |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5475 // for the StrongRootsScope object. We record the current |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5476 // elapsed time before closing the scope so that time |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5477 // taken for the SRS destructor is NOT included in the |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5478 // reported parallel time. |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5479 } |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5480 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5481 double par_time_ms = (end_par_time_sec - start_par_time_sec) * 1000.0; |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5482 g1_policy()->record_par_time(par_time_ms); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5483 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5484 double code_root_fixup_time_ms = |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5485 (os::elapsedTime() - end_par_time_sec) * 1000.0; |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5486 g1_policy()->record_code_root_fixup_time(code_root_fixup_time_ms); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5487 |
| 342 | 5488 set_par_threads(0); |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5489 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5490 // Process any discovered reference objects - we have |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5491 // to do this _before_ we retire the GC alloc regions |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5492 // as we may have to copy some 'reachable' referent |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5493 // objects (and their reachable sub-graphs) that were |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5494 // not copied during the pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5495 process_discovered_references(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5496 |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5497 // Weak root processing. |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5498 // 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
|
5499 // 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
|
5500 // here too. |
| 342 | 5501 { |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5502 G1STWIsAliveClosure is_alive(this); |
| 342 | 5503 G1KeepAliveClosure keep_alive(this); |
| 5504 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
| 5505 } | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5506 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5507 release_gc_alloc_regions(); |
| 342 | 5508 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
|
5509 |
| 889 | 5510 concurrent_g1_refine()->clear_hot_cache(); |
| 342 | 5511 concurrent_g1_refine()->set_use_cache(true); |
| 5512 | |
| 5513 finalize_for_evac_failure(); | |
| 5514 | |
| 5515 if (evacuation_failed()) { | |
| 5516 remove_self_forwarding_pointers(); | |
| 5517 if (PrintGCDetails) { | |
|
1719
b63010841f78
6975964: G1: print out a more descriptive message for evacuation failure when +PrintGCDetails is set
tonyp
parents:
1718
diff
changeset
|
5518 gclog_or_tty->print(" (to-space overflow)"); |
| 342 | 5519 } else if (PrintGC) { |
| 5520 gclog_or_tty->print("--"); | |
| 5521 } | |
| 5522 } | |
| 5523 | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5524 // Enqueue any remaining references remaining on the STW |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5525 // reference processor's discovered lists. We need to do |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5526 // this after the card table is cleaned (and verified) as |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5527 // the act of enqueuing entries on to the pending list |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5528 // will log these updates (and dirty their associated |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5529 // cards). We need these updates logged to update any |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5530 // RSets. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5531 enqueue_discovered_references(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5532 |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5533 if (G1DeferredRSUpdate) { |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5534 RedirtyLoggedCardTableEntryFastClosure redirty; |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5535 dirty_card_queue_set().set_closure(&redirty); |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5536 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
| 1111 | 5537 |
| 5538 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
| 5539 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5540 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5541 } |
| 342 | 5542 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
| 5543 } | |
| 5544 | |
| 2173 | 5545 void G1CollectedHeap::free_region_if_empty(HeapRegion* hr, |
| 2152 | 5546 size_t* pre_used, |
| 5547 FreeRegionList* free_list, | |
| 4072 | 5548 OldRegionSet* old_proxy_set, |
| 2152 | 5549 HumongousRegionSet* humongous_proxy_set, |
| 2173 | 5550 HRRSCleanupTask* hrrs_cleanup_task, |
| 2152 | 5551 bool par) { |
| 5552 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { | |
| 5553 if (hr->isHumongous()) { | |
| 5554 assert(hr->startsHumongous(), "we should only see starts humongous"); | |
| 5555 free_humongous_region(hr, pre_used, free_list, humongous_proxy_set, par); | |
| 5556 } else { | |
| 4072 | 5557 _old_set.remove_with_proxy(hr, old_proxy_set); |
| 2152 | 5558 free_region(hr, pre_used, free_list, par); |
| 342 | 5559 } |
| 2173 | 5560 } else { |
| 5561 hr->rem_set()->do_cleanup_work(hrrs_cleanup_task); | |
| 342 | 5562 } |
| 5563 } | |
| 5564 | |
| 2152 | 5565 void G1CollectedHeap::free_region(HeapRegion* hr, |
| 5566 size_t* pre_used, | |
| 5567 FreeRegionList* free_list, | |
| 5568 bool par) { | |
| 5569 assert(!hr->isHumongous(), "this is only for non-humongous regions"); | |
| 5570 assert(!hr->is_empty(), "the region should not be empty"); | |
| 5571 assert(free_list != NULL, "pre-condition"); | |
| 5572 | |
| 5573 *pre_used += hr->used(); | |
| 5574 hr->hr_clear(par, true /* clear_space */); | |
|
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|
5575 free_list->add_as_head(hr); |
| 2152 | 5576 } |
| 5577 | |
| 5578 void G1CollectedHeap::free_humongous_region(HeapRegion* hr, | |
| 5579 size_t* pre_used, | |
| 5580 FreeRegionList* free_list, | |
| 5581 HumongousRegionSet* humongous_proxy_set, | |
| 5582 bool par) { | |
| 5583 assert(hr->startsHumongous(), "this is only for starts humongous regions"); | |
| 5584 assert(free_list != NULL, "pre-condition"); | |
| 5585 assert(humongous_proxy_set != NULL, "pre-condition"); | |
| 5586 | |
| 5587 size_t hr_used = hr->used(); | |
| 5588 size_t hr_capacity = hr->capacity(); | |
| 5589 size_t hr_pre_used = 0; | |
| 5590 _humongous_set.remove_with_proxy(hr, humongous_proxy_set); | |
| 5591 hr->set_notHumongous(); | |
| 5592 free_region(hr, &hr_pre_used, free_list, par); | |
| 5593 | |
| 3766 | 5594 size_t i = hr->hrs_index() + 1; |
| 2152 | 5595 size_t num = 1; |
| 3766 | 5596 while (i < n_regions()) { |
| 5597 HeapRegion* curr_hr = region_at(i); | |
| 2152 | 5598 if (!curr_hr->continuesHumongous()) { |
| 5599 break; | |
| 5600 } | |
| 5601 curr_hr->set_notHumongous(); | |
| 5602 free_region(curr_hr, &hr_pre_used, free_list, par); | |
| 5603 num += 1; | |
| 5604 i += 1; | |
| 5605 } | |
| 5606 assert(hr_pre_used == hr_used, | |
| 5607 err_msg("hr_pre_used: "SIZE_FORMAT" and hr_used: "SIZE_FORMAT" " | |
| 5608 "should be the same", hr_pre_used, hr_used)); | |
| 5609 *pre_used += hr_pre_used; | |
| 5610 } | |
| 5611 | |
| 5612 void G1CollectedHeap::update_sets_after_freeing_regions(size_t pre_used, | |
| 5613 FreeRegionList* free_list, | |
| 4072 | 5614 OldRegionSet* old_proxy_set, |
| 2152 | 5615 HumongousRegionSet* humongous_proxy_set, |
| 5616 bool par) { | |
| 5617 if (pre_used > 0) { | |
| 5618 Mutex* lock = (par) ? ParGCRareEvent_lock : NULL; | |
| 342 | 5619 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); |
| 2152 | 5620 assert(_summary_bytes_used >= pre_used, |
| 5621 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" " | |
| 5622 "should be >= pre_used: "SIZE_FORMAT, | |
| 5623 _summary_bytes_used, pre_used)); | |
| 342 | 5624 _summary_bytes_used -= pre_used; |
| 2152 | 5625 } |
| 5626 if (free_list != NULL && !free_list->is_empty()) { | |
| 5627 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); | |
|
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|
5628 _free_list.add_as_head(free_list); |
| 2152 | 5629 } |
| 4072 | 5630 if (old_proxy_set != NULL && !old_proxy_set->is_empty()) { |
| 5631 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
| 5632 _old_set.update_from_proxy(old_proxy_set); | |
| 5633 } | |
| 2152 | 5634 if (humongous_proxy_set != NULL && !humongous_proxy_set->is_empty()) { |
| 5635 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
| 5636 _humongous_set.update_from_proxy(humongous_proxy_set); | |
| 342 | 5637 } |
| 5638 } | |
| 5639 | |
|
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|
5640 class G1ParCleanupCTTask : public AbstractGangTask { |
|
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|
5641 CardTableModRefBS* _ct_bs; |
|
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5642 G1CollectedHeap* _g1h; |
|
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5643 HeapRegion* volatile _su_head; |
|
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|
5644 public: |
|
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|
5645 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
|
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|
5646 G1CollectedHeap* g1h) : |
|
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|
5647 AbstractGangTask("G1 Par Cleanup CT Task"), |
|
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|
5648 _ct_bs(ct_bs), _g1h(g1h) { } |
|
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|
5649 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
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diff
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|
5650 void work(uint worker_id) { |
|
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|
5651 HeapRegion* r; |
|
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|
5652 while (r = _g1h->pop_dirty_cards_region()) { |
|
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|
5653 clear_cards(r); |
|
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|
5654 } |
|
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|
5655 } |
|
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|
5656 |
|
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|
5657 void clear_cards(HeapRegion* r) { |
|
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|
5658 // Cards of the survivors should have already been dirtied. |
|
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|
5659 if (!r->is_survivor()) { |
|
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|
5660 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
|
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|
5661 } |
|
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|
5662 } |
|
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|
5663 }; |
|
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|
5664 |
|
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|
5665 #ifndef PRODUCT |
|
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|
5666 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
|
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|
5667 G1CollectedHeap* _g1h; |
|
940
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|
5668 CardTableModRefBS* _ct_bs; |
|
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|
5669 public: |
|
3317
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|
5670 G1VerifyCardTableCleanup(G1CollectedHeap* g1h, CardTableModRefBS* ct_bs) |
|
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|
5671 : _g1h(g1h), _ct_bs(ct_bs) { } |
|
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|
5672 virtual bool doHeapRegion(HeapRegion* r) { |
|
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|
5673 if (r->is_survivor()) { |
|
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|
5674 _g1h->verify_dirty_region(r); |
|
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|
5675 } else { |
|
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|
5676 _g1h->verify_not_dirty_region(r); |
|
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|
5677 } |
|
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|
5678 return false; |
|
8624da129f0b
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|
5679 } |
|
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|
5680 }; |
|
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|
5681 |
|
3317
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|
5682 void G1CollectedHeap::verify_not_dirty_region(HeapRegion* hr) { |
|
063382f9b575
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|
5683 // All of the region should be clean. |
|
063382f9b575
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|
5684 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); |
|
063382f9b575
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|
5685 MemRegion mr(hr->bottom(), hr->end()); |
|
063382f9b575
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changeset
|
5686 ct_bs->verify_not_dirty_region(mr); |
|
063382f9b575
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|
5687 } |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5688 |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5689 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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|
5690 // 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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changeset
|
5691 // 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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|
5692 // retires each region and replaces it with a new one will do a |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5693 // maximal allocation to fill in [pre_dummy_top(),end()] but will |
|
063382f9b575
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|
5694 // not dirty that area (one less thing to have to do while holding |
|
063382f9b575
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|
5695 // a lock). So we can only verify that [bottom(),pre_dummy_top()] |
|
063382f9b575
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|
5696 // is dirty. |
|
063382f9b575
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changeset
|
5697 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
|
063382f9b575
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|
5698 MemRegion mr(hr->bottom(), hr->pre_dummy_top()); |
|
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|
5699 ct_bs->verify_dirty_region(mr); |
|
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|
5700 } |
|
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|
5701 |
|
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|
5702 void G1CollectedHeap::verify_dirty_young_list(HeapRegion* head) { |
|
3317
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|
5703 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
|
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|
5704 for (HeapRegion* hr = head; hr != NULL; hr = hr->get_next_young_region()) { |
|
3317
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|
5705 verify_dirty_region(hr); |
|
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|
5706 } |
|
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|
5707 } |
|
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|
5708 |
|
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|
5709 void G1CollectedHeap::verify_dirty_young_regions() { |
|
abdfc822206f
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|
5710 verify_dirty_young_list(_young_list->first_region()); |
|
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|
5711 verify_dirty_young_list(_young_list->first_survivor_region()); |
|
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|
5712 } |
|
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|
5713 #endif |
|
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|
5714 |
| 342 | 5715 void G1CollectedHeap::cleanUpCardTable() { |
| 5716 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
| 5717 double start = os::elapsedTime(); | |
| 5718 | |
| 4023 | 5719 { |
| 5720 // Iterate over the dirty cards region list. | |
| 5721 G1ParCleanupCTTask cleanup_task(ct_bs, this); | |
| 5722 | |
| 4711 | 5723 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 5724 set_par_threads(); | |
| 4023 | 5725 workers()->run_task(&cleanup_task); |
| 5726 set_par_threads(0); | |
| 5727 } else { | |
| 5728 while (_dirty_cards_region_list) { | |
| 5729 HeapRegion* r = _dirty_cards_region_list; | |
| 5730 cleanup_task.clear_cards(r); | |
| 5731 _dirty_cards_region_list = r->get_next_dirty_cards_region(); | |
| 5732 if (_dirty_cards_region_list == r) { | |
| 5733 // The last region. | |
| 5734 _dirty_cards_region_list = NULL; | |
| 5735 } | |
| 5736 r->set_next_dirty_cards_region(NULL); | |
|
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|
5737 } |
|
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|
5738 } |
| 4023 | 5739 #ifndef PRODUCT |
| 5740 if (G1VerifyCTCleanup || VerifyAfterGC) { | |
| 5741 G1VerifyCardTableCleanup cleanup_verifier(this, ct_bs); | |
| 5742 heap_region_iterate(&cleanup_verifier); | |
| 5743 } | |
| 5744 #endif | |
|
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|
5745 } |
|
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|
5746 |
| 342 | 5747 double elapsed = os::elapsedTime() - start; |
|
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diff
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|
5748 g1_policy()->record_clear_ct_time(elapsed * 1000.0); |
| 342 | 5749 } |
| 5750 | |
| 5751 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
| 2152 | 5752 size_t pre_used = 0; |
| 5753 FreeRegionList local_free_list("Local List for CSet Freeing"); | |
| 5754 | |
| 342 | 5755 double young_time_ms = 0.0; |
| 5756 double non_young_time_ms = 0.0; | |
| 5757 | |
|
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5758 // Since the collection set is a superset of the the young list, |
|
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|
5759 // all we need to do to clear the young list is clear its |
|
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|
5760 // head and length, and unlink any young regions in the code below |
|
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|
5761 _young_list->clear(); |
|
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|
5762 |
| 342 | 5763 G1CollectorPolicy* policy = g1_policy(); |
| 5764 | |
| 5765 double start_sec = os::elapsedTime(); | |
| 5766 bool non_young = true; | |
| 5767 | |
| 5768 HeapRegion* cur = cs_head; | |
| 5769 int age_bound = -1; | |
| 5770 size_t rs_lengths = 0; | |
| 5771 | |
| 5772 while (cur != NULL) { | |
| 2361 | 5773 assert(!is_on_master_free_list(cur), "sanity"); |
| 342 | 5774 if (non_young) { |
| 5775 if (cur->is_young()) { | |
| 5776 double end_sec = os::elapsedTime(); | |
| 5777 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 5778 non_young_time_ms += elapsed_ms; | |
| 5779 | |
| 5780 start_sec = os::elapsedTime(); | |
| 5781 non_young = false; | |
| 5782 } | |
| 5783 } else { | |
|
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|
5784 if (!cur->is_young()) { |
|
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|
5785 double end_sec = os::elapsedTime(); |
|
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|
5786 double elapsed_ms = (end_sec - start_sec) * 1000.0; |
|
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|
5787 young_time_ms += elapsed_ms; |
|
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|
5788 |
|
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|
5789 start_sec = os::elapsedTime(); |
|
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|
5790 non_young = true; |
|
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|
5791 } |
| 342 | 5792 } |
| 5793 | |
| 5794 rs_lengths += cur->rem_set()->occupied(); | |
| 5795 | |
| 5796 HeapRegion* next = cur->next_in_collection_set(); | |
| 5797 assert(cur->in_collection_set(), "bad CS"); | |
| 5798 cur->set_next_in_collection_set(NULL); | |
| 5799 cur->set_in_collection_set(false); | |
| 5800 | |
| 5801 if (cur->is_young()) { | |
| 5802 int index = cur->young_index_in_cset(); | |
|
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|
5803 assert(index != -1, "invariant"); |
|
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|
5804 assert((size_t) index < policy->young_cset_region_length(), "invariant"); |
| 342 | 5805 size_t words_survived = _surviving_young_words[index]; |
| 5806 cur->record_surv_words_in_group(words_survived); | |
|
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|
5807 |
|
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|
5808 // At this point the we have 'popped' cur from the collection set |
|
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|
5809 // (linked via next_in_collection_set()) but it is still in the |
|
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|
5810 // young list (linked via next_young_region()). Clear the |
|
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|
5811 // _next_young_region field. |
|
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|
5812 cur->set_next_young_region(NULL); |
| 342 | 5813 } else { |
| 5814 int index = cur->young_index_in_cset(); | |
|
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|
5815 assert(index == -1, "invariant"); |
| 342 | 5816 } |
| 5817 | |
| 5818 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
| 5819 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
| 5820 "invariant" ); | |
| 5821 | |
| 5822 if (!cur->evacuation_failed()) { | |
|
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|
5823 MemRegion used_mr = cur->used_region(); |
|
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5824 |
| 342 | 5825 // And the region is empty. |
|
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|
5826 assert(!used_mr.is_empty(), "Should not have empty regions in a CS."); |
| 2152 | 5827 free_region(cur, &pre_used, &local_free_list, false /* par */); |
| 342 | 5828 } else { |
| 5829 cur->uninstall_surv_rate_group(); | |
|
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|
5830 if (cur->is_young()) { |
| 342 | 5831 cur->set_young_index_in_cset(-1); |
|
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|
5832 } |
| 342 | 5833 cur->set_not_young(); |
| 5834 cur->set_evacuation_failed(false); | |
| 4072 | 5835 // The region is now considered to be old. |
| 5836 _old_set.add(cur); | |
| 342 | 5837 } |
| 5838 cur = next; | |
| 5839 } | |
| 5840 | |
| 5841 policy->record_max_rs_lengths(rs_lengths); | |
| 5842 policy->cset_regions_freed(); | |
| 5843 | |
| 5844 double end_sec = os::elapsedTime(); | |
| 5845 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
|
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|
5846 |
|
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|
5847 if (non_young) { |
| 342 | 5848 non_young_time_ms += elapsed_ms; |
|
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|
5849 } else { |
| 342 | 5850 young_time_ms += elapsed_ms; |
|
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|
5851 } |
| 342 | 5852 |
| 2152 | 5853 update_sets_after_freeing_regions(pre_used, &local_free_list, |
| 4072 | 5854 NULL /* old_proxy_set */, |
| 2152 | 5855 NULL /* humongous_proxy_set */, |
| 5856 false /* par */); | |
| 342 | 5857 policy->record_young_free_cset_time_ms(young_time_ms); |
| 5858 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
| 5859 } | |
| 5860 | |
|
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|
5861 // This routine is similar to the above but does not record |
|
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|
5862 // any policy statistics or update free lists; we are abandoning |
|
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|
5863 // the current incremental collection set in preparation of a |
|
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|
5864 // full collection. After the full GC we will start to build up |
|
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|
5865 // the incremental collection set again. |
|
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|
5866 // This is only called when we're doing a full collection |
|
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|
5867 // and is immediately followed by the tearing down of the young list. |
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|
5868 |
|
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|
5869 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
|
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|
5870 HeapRegion* cur = cs_head; |
|
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|
5871 |
|
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|
5872 while (cur != NULL) { |
|
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|
5873 HeapRegion* next = cur->next_in_collection_set(); |
|
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|
5874 assert(cur->in_collection_set(), "bad CS"); |
|
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|
5875 cur->set_next_in_collection_set(NULL); |
|
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|
5876 cur->set_in_collection_set(false); |
|
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|
5877 cur->set_young_index_in_cset(-1); |
|
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|
5878 cur = next; |
|
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|
5879 } |
|
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|
5880 } |
|
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|
5881 |
| 2152 | 5882 void G1CollectedHeap::set_free_regions_coming() { |
| 5883 if (G1ConcRegionFreeingVerbose) { | |
| 5884 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
| 5885 "setting free regions coming"); | |
| 5886 } | |
| 5887 | |
| 5888 assert(!free_regions_coming(), "pre-condition"); | |
| 5889 _free_regions_coming = true; | |
| 342 | 5890 } |
| 5891 | |
| 2152 | 5892 void G1CollectedHeap::reset_free_regions_coming() { |
|
4837
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|
5893 assert(free_regions_coming(), "pre-condition"); |
|
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|
5894 |
| 2152 | 5895 { |
| 5896 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 5897 _free_regions_coming = false; | |
| 5898 SecondaryFreeList_lock->notify_all(); | |
| 5899 } | |
| 5900 | |
| 5901 if (G1ConcRegionFreeingVerbose) { | |
| 5902 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
| 5903 "reset free regions coming"); | |
| 342 | 5904 } |
| 5905 } | |
| 5906 | |
| 2152 | 5907 void G1CollectedHeap::wait_while_free_regions_coming() { |
| 5908 // Most of the time we won't have to wait, so let's do a quick test | |
| 5909 // first before we take the lock. | |
| 5910 if (!free_regions_coming()) { | |
| 5911 return; | |
| 5912 } | |
| 5913 | |
| 5914 if (G1ConcRegionFreeingVerbose) { | |
| 5915 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
| 5916 "waiting for free regions"); | |
| 342 | 5917 } |
| 5918 | |
| 5919 { | |
| 2152 | 5920 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
| 5921 while (free_regions_coming()) { | |
| 5922 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 342 | 5923 } |
| 2152 | 5924 } |
| 5925 | |
| 5926 if (G1ConcRegionFreeingVerbose) { | |
| 5927 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
| 5928 "done waiting for free regions"); | |
| 5929 } | |
| 342 | 5930 } |
| 5931 | |
| 5932 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
| 5933 assert(heap_lock_held_for_gc(), | |
| 5934 "the heap lock should already be held by or for this thread"); | |
| 5935 _young_list->push_region(hr); | |
| 5936 } | |
| 5937 | |
| 5938 class NoYoungRegionsClosure: public HeapRegionClosure { | |
| 5939 private: | |
| 5940 bool _success; | |
| 5941 public: | |
| 5942 NoYoungRegionsClosure() : _success(true) { } | |
| 5943 bool doHeapRegion(HeapRegion* r) { | |
| 5944 if (r->is_young()) { | |
| 5945 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
| 5946 r->bottom(), r->end()); | |
| 5947 _success = false; | |
| 5948 } | |
| 5949 return false; | |
| 5950 } | |
| 5951 bool success() { return _success; } | |
| 5952 }; | |
| 5953 | |
|
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|
5954 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
|
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|
5955 bool ret = _young_list->check_list_empty(check_sample); |
|
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|
5956 |
|
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|
5957 if (check_heap) { |
| 342 | 5958 NoYoungRegionsClosure closure; |
| 5959 heap_region_iterate(&closure); | |
| 5960 ret = ret && closure.success(); | |
| 5961 } | |
| 5962 | |
| 5963 return ret; | |
| 5964 } | |
| 5965 | |
| 4072 | 5966 class TearDownRegionSetsClosure : public HeapRegionClosure { |
| 5967 private: | |
| 5968 OldRegionSet *_old_set; | |
| 2152 | 5969 |
| 342 | 5970 public: |
| 4072 | 5971 TearDownRegionSetsClosure(OldRegionSet* old_set) : _old_set(old_set) { } |
| 2152 | 5972 |
| 342 | 5973 bool doHeapRegion(HeapRegion* r) { |
| 4072 | 5974 if (r->is_empty()) { |
| 5975 // We ignore empty regions, we'll empty the free list afterwards | |
| 5976 } else if (r->is_young()) { | |
| 5977 // We ignore young regions, we'll empty the young list afterwards | |
| 5978 } else if (r->isHumongous()) { | |
| 5979 // We ignore humongous regions, we're not tearing down the | |
| 5980 // humongous region set | |
| 342 | 5981 } else { |
| 4072 | 5982 // The rest should be old |
| 5983 _old_set->remove(r); | |
| 342 | 5984 } |
| 5985 return false; | |
| 5986 } | |
| 5987 | |
| 4072 | 5988 ~TearDownRegionSetsClosure() { |
| 5989 assert(_old_set->is_empty(), "post-condition"); | |
| 2152 | 5990 } |
| 342 | 5991 }; |
| 5992 | |
| 4072 | 5993 void G1CollectedHeap::tear_down_region_sets(bool free_list_only) { |
| 5994 assert_at_safepoint(true /* should_be_vm_thread */); | |
| 5995 | |
| 5996 if (!free_list_only) { | |
| 5997 TearDownRegionSetsClosure cl(&_old_set); | |
| 5998 heap_region_iterate(&cl); | |
| 5999 | |
| 6000 // Need to do this after the heap iteration to be able to | |
| 6001 // recognize the young regions and ignore them during the iteration. | |
| 6002 _young_list->empty_list(); | |
| 6003 } | |
| 6004 _free_list.remove_all(); | |
| 6005 } | |
| 6006 | |
| 6007 class RebuildRegionSetsClosure : public HeapRegionClosure { | |
| 6008 private: | |
| 6009 bool _free_list_only; | |
| 6010 OldRegionSet* _old_set; | |
| 6011 FreeRegionList* _free_list; | |
| 6012 size_t _total_used; | |
| 6013 | |
| 6014 public: | |
| 6015 RebuildRegionSetsClosure(bool free_list_only, | |
| 6016 OldRegionSet* old_set, FreeRegionList* free_list) : | |
| 6017 _free_list_only(free_list_only), | |
| 6018 _old_set(old_set), _free_list(free_list), _total_used(0) { | |
| 6019 assert(_free_list->is_empty(), "pre-condition"); | |
| 6020 if (!free_list_only) { | |
| 6021 assert(_old_set->is_empty(), "pre-condition"); | |
| 6022 } | |
| 6023 } | |
| 6024 | |
| 6025 bool doHeapRegion(HeapRegion* r) { | |
| 6026 if (r->continuesHumongous()) { | |
| 6027 return false; | |
| 6028 } | |
| 6029 | |
| 6030 if (r->is_empty()) { | |
| 6031 // Add free regions to the free list | |
| 6032 _free_list->add_as_tail(r); | |
| 6033 } else if (!_free_list_only) { | |
| 6034 assert(!r->is_young(), "we should not come across young regions"); | |
| 6035 | |
| 6036 if (r->isHumongous()) { | |
| 6037 // We ignore humongous regions, we left the humongous set unchanged | |
| 6038 } else { | |
| 6039 // The rest should be old, add them to the old set | |
| 6040 _old_set->add(r); | |
| 6041 } | |
| 6042 _total_used += r->used(); | |
| 6043 } | |
| 6044 | |
| 6045 return false; | |
| 6046 } | |
| 6047 | |
| 6048 size_t total_used() { | |
| 6049 return _total_used; | |
| 6050 } | |
| 6051 }; | |
| 6052 | |
| 6053 void G1CollectedHeap::rebuild_region_sets(bool free_list_only) { | |
| 6054 assert_at_safepoint(true /* should_be_vm_thread */); | |
| 6055 | |
| 6056 RebuildRegionSetsClosure cl(free_list_only, &_old_set, &_free_list); | |
| 6057 heap_region_iterate(&cl); | |
| 6058 | |
| 6059 if (!free_list_only) { | |
| 6060 _summary_bytes_used = cl.total_used(); | |
| 6061 } | |
| 6062 assert(_summary_bytes_used == recalculate_used(), | |
| 6063 err_msg("inconsistent _summary_bytes_used, " | |
| 6064 "value: "SIZE_FORMAT" recalculated: "SIZE_FORMAT, | |
| 6065 _summary_bytes_used, recalculate_used())); | |
| 342 | 6066 } |
| 6067 | |
| 6068 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
| 6069 _refine_cte_cl->set_concurrent(concurrent); | |
| 6070 } | |
| 6071 | |
| 6072 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
| 6073 HeapRegion* hr = heap_region_containing(p); | |
| 6074 if (hr == NULL) { | |
| 6075 return is_in_permanent(p); | |
| 6076 } else { | |
| 6077 return hr->is_in(p); | |
| 6078 } | |
| 6079 } | |
| 2152 | 6080 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6081 // Methods for the mutator alloc region |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
diff
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|
6082 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
6083 HeapRegion* G1CollectedHeap::new_mutator_alloc_region(size_t word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
changeset
|
6084 bool force) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6085 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
|
6086 assert(!force || g1_policy()->can_expand_young_list(), |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6087 "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
|
6088 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
|
6089 if (force || !young_list_full) { |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6090 HeapRegion* new_alloc_region = new_region(word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6091 false /* do_expand */); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6092 if (new_alloc_region != NULL) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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diff
changeset
|
6093 set_region_short_lived_locked(new_alloc_region); |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
6094 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Eden, young_list_full); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
diff
changeset
|
6095 return new_alloc_region; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6096 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6097 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6098 return NULL; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6099 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6100 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
changeset
|
6101 void G1CollectedHeap::retire_mutator_alloc_region(HeapRegion* alloc_region, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
6102 size_t allocated_bytes) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
6103 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
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diff
changeset
|
6104 assert(alloc_region->is_young(), "all mutator alloc regions should be young"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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|
6105 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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diff
changeset
|
6106 g1_policy()->add_region_to_incremental_cset_lhs(alloc_region); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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|
6107 _summary_bytes_used += allocated_bytes; |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
6108 _hr_printer.retire(alloc_region); |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
6109 // 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
|
6110 // 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
|
6111 // used space has been recored in _summary_bytes_used. |
|
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
6112 g1mm()->update_eden_size(); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
diff
changeset
|
6113 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6114 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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diff
changeset
|
6115 HeapRegion* MutatorAllocRegion::allocate_new_region(size_t word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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diff
changeset
|
6116 bool force) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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diff
changeset
|
6117 return _g1h->new_mutator_alloc_region(word_size, force); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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diff
changeset
|
6118 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6119 |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6120 void G1CollectedHeap::set_par_threads() { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6121 // 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
|
6122 // in the workgroup. |
| 4711 | 6123 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
|
6124 uint n_workers = workers()->active_workers(); |
| 4711 | 6125 assert(UseDynamicNumberOfGCThreads || |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6126 n_workers == workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6127 "Otherwise should be using the total number of workers"); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6128 if (n_workers == 0) { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6129 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
|
6130 n_workers = ParallelGCThreads; |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6131 workers()->set_active_workers(n_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6132 } |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6133 set_par_threads(n_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6134 } |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6135 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6136 void MutatorAllocRegion::retire_region(HeapRegion* alloc_region, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6137 size_t allocated_bytes) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6138 _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
|
6139 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6140 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6141 // 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
|
6142 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6143 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
|
6144 size_t count, |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6145 GCAllocPurpose ap) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6146 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
|
6147 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6148 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
|
6149 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
|
6150 true /* do_expand */); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6151 if (new_alloc_region != NULL) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6152 // 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
|
6153 // 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
|
6154 // for survivors too. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6155 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
|
6156 if (ap == GCAllocForSurvived) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6157 new_alloc_region->set_survivor(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6158 _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
|
6159 } else { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6160 _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
|
6161 } |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
6162 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
|
6163 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
|
6164 return new_alloc_region; |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6165 } else { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6166 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
|
6167 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6168 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6169 return NULL; |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6170 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6171 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6172 void G1CollectedHeap::retire_gc_alloc_region(HeapRegion* alloc_region, |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
changeset
|
6173 size_t allocated_bytes, |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6174 GCAllocPurpose ap) { |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
6175 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
|
6176 alloc_region->note_end_of_copying(during_im); |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6177 g1_policy()->record_bytes_copied_during_gc(allocated_bytes); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6178 if (ap == GCAllocForSurvived) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6179 young_list()->add_survivor_region(alloc_region); |
| 4072 | 6180 } else { |
| 6181 _old_set.add(alloc_region); | |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6182 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6183 _hr_printer.retire(alloc_region); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6184 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6185 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6186 HeapRegion* SurvivorGCAllocRegion::allocate_new_region(size_t word_size, |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6187 bool force) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6188 assert(!force, "not supported for GC alloc regions"); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6189 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForSurvived); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6190 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6191 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6192 void SurvivorGCAllocRegion::retire_region(HeapRegion* alloc_region, |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6193 size_t allocated_bytes) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6194 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6195 GCAllocForSurvived); |
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6196 } |
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6197 |
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6198 HeapRegion* OldGCAllocRegion::allocate_new_region(size_t word_size, |
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6199 bool force) { |
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6200 assert(!force, "not supported for GC alloc regions"); |
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6201 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForTenured); |
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6202 } |
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6203 |
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6204 void OldGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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6205 size_t allocated_bytes) { |
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6206 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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6207 GCAllocForTenured); |
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6208 } |
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2433
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6209 // Heap region set verification |
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6210 |
| 2152 | 6211 class VerifyRegionListsClosure : public HeapRegionClosure { |
| 6212 private: | |
| 4072 | 6213 FreeRegionList* _free_list; |
| 6214 OldRegionSet* _old_set; | |
| 2152 | 6215 HumongousRegionSet* _humongous_set; |
| 6216 size_t _region_count; | |
| 6217 | |
| 6218 public: | |
| 4072 | 6219 VerifyRegionListsClosure(OldRegionSet* old_set, |
| 6220 HumongousRegionSet* humongous_set, | |
| 2152 | 6221 FreeRegionList* free_list) : |
| 4072 | 6222 _old_set(old_set), _humongous_set(humongous_set), |
| 6223 _free_list(free_list), _region_count(0) { } | |
| 2152 | 6224 |
| 6225 size_t region_count() { return _region_count; } | |
| 6226 | |
| 6227 bool doHeapRegion(HeapRegion* hr) { | |
| 6228 _region_count += 1; | |
| 6229 | |
| 6230 if (hr->continuesHumongous()) { | |
| 6231 return false; | |
| 6232 } | |
| 6233 | |
| 6234 if (hr->is_young()) { | |
| 6235 // TODO | |
| 6236 } else if (hr->startsHumongous()) { | |
| 6237 _humongous_set->verify_next_region(hr); | |
| 6238 } else if (hr->is_empty()) { | |
| 6239 _free_list->verify_next_region(hr); | |
| 4072 | 6240 } else { |
| 6241 _old_set->verify_next_region(hr); | |
| 2152 | 6242 } |
| 6243 return false; | |
| 6244 } | |
| 6245 }; | |
| 6246 | |
| 3766 | 6247 HeapRegion* G1CollectedHeap::new_heap_region(size_t hrs_index, |
| 6248 HeapWord* bottom) { | |
| 6249 HeapWord* end = bottom + HeapRegion::GrainWords; | |
| 6250 MemRegion mr(bottom, end); | |
| 6251 assert(_g1_reserved.contains(mr), "invariant"); | |
| 6252 // This might return NULL if the allocation fails | |
| 6253 return new HeapRegion(hrs_index, _bot_shared, mr, true /* is_zeroed */); | |
| 6254 } | |
| 6255 | |
| 2152 | 6256 void G1CollectedHeap::verify_region_sets() { |
| 6257 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); | |
| 6258 | |
| 6259 // First, check the explicit lists. | |
| 6260 _free_list.verify(); | |
| 6261 { | |
| 6262 // Given that a concurrent operation might be adding regions to | |
| 6263 // the secondary free list we have to take the lock before | |
| 6264 // verifying it. | |
| 6265 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 6266 _secondary_free_list.verify(); | |
| 6267 } | |
| 4072 | 6268 _old_set.verify(); |
| 2152 | 6269 _humongous_set.verify(); |
| 6270 | |
| 6271 // If a concurrent region freeing operation is in progress it will | |
| 6272 // be difficult to correctly attributed any free regions we come | |
| 6273 // across to the correct free list given that they might belong to | |
| 6274 // one of several (free_list, secondary_free_list, any local lists, | |
| 6275 // etc.). So, if that's the case we will skip the rest of the | |
| 6276 // verification operation. Alternatively, waiting for the concurrent | |
| 6277 // operation to complete will have a non-trivial effect on the GC's | |
| 6278 // operation (no concurrent operation will last longer than the | |
| 6279 // interval between two calls to verification) and it might hide | |
| 6280 // any issues that we would like to catch during testing. | |
| 6281 if (free_regions_coming()) { | |
| 6282 return; | |
| 6283 } | |
| 6284 | |
| 2361 | 6285 // Make sure we append the secondary_free_list on the free_list so |
| 6286 // that all free regions we will come across can be safely | |
| 6287 // attributed to the free_list. | |
| 6288 append_secondary_free_list_if_not_empty_with_lock(); | |
| 2152 | 6289 |
| 6290 // Finally, make sure that the region accounting in the lists is | |
| 6291 // consistent with what we see in the heap. | |
| 4072 | 6292 _old_set.verify_start(); |
| 2152 | 6293 _humongous_set.verify_start(); |
| 6294 _free_list.verify_start(); | |
| 6295 | |
| 4072 | 6296 VerifyRegionListsClosure cl(&_old_set, &_humongous_set, &_free_list); |
| 2152 | 6297 heap_region_iterate(&cl); |
| 6298 | |
| 4072 | 6299 _old_set.verify_end(); |
| 2152 | 6300 _humongous_set.verify_end(); |
| 6301 _free_list.verify_end(); | |
| 342 | 6302 } |