Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 4097:dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
Summary: Parallelize the serial code that was used to mark objects reachable from survivor objects in the collection set. Some minor improvments in the timers used to track the freeing of the collection set along with some tweaks to PrintGCDetails.
Reviewed-by: tonyp, brutisso
| author | johnc |
|---|---|
| date | Thu, 17 Nov 2011 12:40:15 -0800 |
| parents | bca17e38de00 |
| children | 3c648b9ad052 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "code/icBuffer.hpp" | |
| 27 #include "gc_implementation/g1/bufferingOopClosure.hpp" | |
| 28 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
| 29 #include "gc_implementation/g1/concurrentG1RefineThread.hpp" | |
| 30 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
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31 #include "gc_implementation/g1/g1AllocRegion.inline.hpp" |
| 1972 | 32 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
| 33 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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34 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
| 1972 | 35 #include "gc_implementation/g1/g1MarkSweep.hpp" |
| 36 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
| 37 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
| 38 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
| 39 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
| 40 #include "gc_implementation/g1/vm_operations_g1.hpp" | |
| 41 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
| 42 #include "memory/gcLocker.inline.hpp" | |
| 43 #include "memory/genOopClosures.inline.hpp" | |
| 44 #include "memory/generationSpec.hpp" | |
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45 #include "memory/referenceProcessor.hpp" |
| 1972 | 46 #include "oops/oop.inline.hpp" |
| 47 #include "oops/oop.pcgc.inline.hpp" | |
| 48 #include "runtime/aprofiler.hpp" | |
| 49 #include "runtime/vmThread.hpp" | |
| 342 | 50 |
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51 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0; |
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52 |
| 342 | 53 // turn it on so that the contents of the young list (scan-only / |
| 54 // to-be-collected) are printed at "strategic" points before / during | |
| 55 // / after the collection --- this is useful for debugging | |
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56 #define YOUNG_LIST_VERBOSE 0 |
| 342 | 57 // CURRENT STATUS |
| 58 // This file is under construction. Search for "FIXME". | |
| 59 | |
| 60 // INVARIANTS/NOTES | |
| 61 // | |
| 62 // All allocation activity covered by the G1CollectedHeap interface is | |
| 1973 | 63 // serialized by acquiring the HeapLock. This happens in mem_allocate |
| 64 // and allocate_new_tlab, which are the "entry" points to the | |
| 65 // allocation code from the rest of the JVM. (Note that this does not | |
| 66 // apply to TLAB allocation, which is not part of this interface: it | |
| 67 // is done by clients of this interface.) | |
| 342 | 68 |
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69 // Notes on implementation of parallelism in different tasks. |
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70 // |
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71 // G1ParVerifyTask uses heap_region_par_iterate_chunked() for parallelism. |
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72 // The number of GC workers is passed to heap_region_par_iterate_chunked(). |
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73 // It does use run_task() which sets _n_workers in the task. |
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74 // G1ParTask executes g1_process_strong_roots() -> |
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75 // SharedHeap::process_strong_roots() which calls eventuall to |
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76 // CardTableModRefBS::par_non_clean_card_iterate_work() which uses |
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77 // SequentialSubTasksDone. SharedHeap::process_strong_roots() also |
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78 // directly uses SubTasksDone (_process_strong_tasks field in SharedHeap). |
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79 // |
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80 |
| 342 | 81 // Local to this file. |
| 82 | |
| 83 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
| 84 SuspendibleThreadSet* _sts; | |
| 85 G1RemSet* _g1rs; | |
| 86 ConcurrentG1Refine* _cg1r; | |
| 87 bool _concurrent; | |
| 88 public: | |
| 89 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
| 90 G1RemSet* g1rs, | |
| 91 ConcurrentG1Refine* cg1r) : | |
| 92 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
| 93 {} | |
| 94 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 1705 | 95 bool oops_into_cset = _g1rs->concurrentRefineOneCard(card_ptr, worker_i, false); |
| 96 // This path is executed by the concurrent refine or mutator threads, | |
| 97 // concurrently, and so we do not care if card_ptr contains references | |
| 98 // that point into the collection set. | |
| 99 assert(!oops_into_cset, "should be"); | |
| 100 | |
| 342 | 101 if (_concurrent && _sts->should_yield()) { |
| 102 // Caller will actually yield. | |
| 103 return false; | |
| 104 } | |
| 105 // Otherwise, we finished successfully; return true. | |
| 106 return true; | |
| 107 } | |
| 108 void set_concurrent(bool b) { _concurrent = b; } | |
| 109 }; | |
| 110 | |
| 111 | |
| 112 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 113 int _calls; | |
| 114 G1CollectedHeap* _g1h; | |
| 115 CardTableModRefBS* _ctbs; | |
| 116 int _histo[256]; | |
| 117 public: | |
| 118 ClearLoggedCardTableEntryClosure() : | |
| 119 _calls(0) | |
| 120 { | |
| 121 _g1h = G1CollectedHeap::heap(); | |
| 122 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 123 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
| 124 } | |
| 125 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 126 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 127 _calls++; | |
| 128 unsigned char* ujb = (unsigned char*)card_ptr; | |
| 129 int ind = (int)(*ujb); | |
| 130 _histo[ind]++; | |
| 131 *card_ptr = -1; | |
| 132 } | |
| 133 return true; | |
| 134 } | |
| 135 int calls() { return _calls; } | |
| 136 void print_histo() { | |
| 137 gclog_or_tty->print_cr("Card table value histogram:"); | |
| 138 for (int i = 0; i < 256; i++) { | |
| 139 if (_histo[i] != 0) { | |
| 140 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
| 141 } | |
| 142 } | |
| 143 } | |
| 144 }; | |
| 145 | |
| 146 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 147 int _calls; | |
| 148 G1CollectedHeap* _g1h; | |
| 149 CardTableModRefBS* _ctbs; | |
| 150 public: | |
| 151 RedirtyLoggedCardTableEntryClosure() : | |
| 152 _calls(0) | |
| 153 { | |
| 154 _g1h = G1CollectedHeap::heap(); | |
| 155 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 156 } | |
| 157 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 158 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 159 _calls++; | |
| 160 *card_ptr = 0; | |
| 161 } | |
| 162 return true; | |
| 163 } | |
| 164 int calls() { return _calls; } | |
| 165 }; | |
| 166 | |
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167 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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168 public: |
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169 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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170 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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171 return true; |
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172 } |
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173 }; |
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174 |
| 342 | 175 YoungList::YoungList(G1CollectedHeap* g1h) |
| 176 : _g1h(g1h), _head(NULL), | |
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177 _length(0), |
| 342 | 178 _last_sampled_rs_lengths(0), |
| 545 | 179 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) |
| 342 | 180 { |
| 181 guarantee( check_list_empty(false), "just making sure..." ); | |
| 182 } | |
| 183 | |
| 184 void YoungList::push_region(HeapRegion *hr) { | |
| 185 assert(!hr->is_young(), "should not already be young"); | |
| 186 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
| 187 | |
| 188 hr->set_next_young_region(_head); | |
| 189 _head = hr; | |
| 190 | |
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191 _g1h->g1_policy()->set_region_eden(hr, (int) _length); |
| 342 | 192 ++_length; |
| 193 } | |
| 194 | |
| 195 void YoungList::add_survivor_region(HeapRegion* hr) { | |
| 545 | 196 assert(hr->is_survivor(), "should be flagged as survivor region"); |
| 342 | 197 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
| 198 | |
| 199 hr->set_next_young_region(_survivor_head); | |
| 200 if (_survivor_head == NULL) { | |
| 545 | 201 _survivor_tail = hr; |
| 342 | 202 } |
| 203 _survivor_head = hr; | |
| 204 ++_survivor_length; | |
| 205 } | |
| 206 | |
| 207 void YoungList::empty_list(HeapRegion* list) { | |
| 208 while (list != NULL) { | |
| 209 HeapRegion* next = list->get_next_young_region(); | |
| 210 list->set_next_young_region(NULL); | |
| 211 list->uninstall_surv_rate_group(); | |
| 212 list->set_not_young(); | |
| 213 list = next; | |
| 214 } | |
| 215 } | |
| 216 | |
| 217 void YoungList::empty_list() { | |
| 218 assert(check_list_well_formed(), "young list should be well formed"); | |
| 219 | |
| 220 empty_list(_head); | |
| 221 _head = NULL; | |
| 222 _length = 0; | |
| 223 | |
| 224 empty_list(_survivor_head); | |
| 225 _survivor_head = NULL; | |
| 545 | 226 _survivor_tail = NULL; |
| 342 | 227 _survivor_length = 0; |
| 228 | |
| 229 _last_sampled_rs_lengths = 0; | |
| 230 | |
| 231 assert(check_list_empty(false), "just making sure..."); | |
| 232 } | |
| 233 | |
| 234 bool YoungList::check_list_well_formed() { | |
| 235 bool ret = true; | |
| 236 | |
| 237 size_t length = 0; | |
| 238 HeapRegion* curr = _head; | |
| 239 HeapRegion* last = NULL; | |
| 240 while (curr != NULL) { | |
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241 if (!curr->is_young()) { |
| 342 | 242 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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243 "incorrectly tagged (y: %d, surv: %d)", |
| 342 | 244 curr->bottom(), curr->end(), |
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245 curr->is_young(), curr->is_survivor()); |
| 342 | 246 ret = false; |
| 247 } | |
| 248 ++length; | |
| 249 last = curr; | |
| 250 curr = curr->get_next_young_region(); | |
| 251 } | |
| 252 ret = ret && (length == _length); | |
| 253 | |
| 254 if (!ret) { | |
| 255 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
| 256 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
| 257 length, _length); | |
| 258 } | |
| 259 | |
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260 return ret; |
| 342 | 261 } |
| 262 | |
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263 bool YoungList::check_list_empty(bool check_sample) { |
| 342 | 264 bool ret = true; |
| 265 | |
| 266 if (_length != 0) { | |
| 267 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
| 268 _length); | |
| 269 ret = false; | |
| 270 } | |
| 271 if (check_sample && _last_sampled_rs_lengths != 0) { | |
| 272 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
| 273 ret = false; | |
| 274 } | |
| 275 if (_head != NULL) { | |
| 276 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
| 277 ret = false; | |
| 278 } | |
| 279 if (!ret) { | |
| 280 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
| 281 } | |
| 282 | |
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283 return ret; |
| 342 | 284 } |
| 285 | |
| 286 void | |
| 287 YoungList::rs_length_sampling_init() { | |
| 288 _sampled_rs_lengths = 0; | |
| 289 _curr = _head; | |
| 290 } | |
| 291 | |
| 292 bool | |
| 293 YoungList::rs_length_sampling_more() { | |
| 294 return _curr != NULL; | |
| 295 } | |
| 296 | |
| 297 void | |
| 298 YoungList::rs_length_sampling_next() { | |
| 299 assert( _curr != NULL, "invariant" ); | |
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300 size_t rs_length = _curr->rem_set()->occupied(); |
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301 |
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302 _sampled_rs_lengths += rs_length; |
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303 |
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304 // The current region may not yet have been added to the |
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305 // incremental collection set (it gets added when it is |
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306 // retired as the current allocation region). |
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307 if (_curr->in_collection_set()) { |
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308 // Update the collection set policy information for this region |
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309 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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310 } |
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311 |
| 342 | 312 _curr = _curr->get_next_young_region(); |
| 313 if (_curr == NULL) { | |
| 314 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
| 315 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
| 316 } | |
| 317 } | |
| 318 | |
| 319 void | |
| 320 YoungList::reset_auxilary_lists() { | |
| 321 guarantee( is_empty(), "young list should be empty" ); | |
| 322 assert(check_list_well_formed(), "young list should be well formed"); | |
| 323 | |
| 324 // Add survivor regions to SurvRateGroup. | |
| 325 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
| 545 | 326 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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327 |
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328 int young_index_in_cset = 0; |
| 342 | 329 for (HeapRegion* curr = _survivor_head; |
| 330 curr != NULL; | |
| 331 curr = curr->get_next_young_region()) { | |
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332 _g1h->g1_policy()->set_region_survivor(curr, young_index_in_cset); |
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333 |
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334 // The region is a non-empty survivor so let's add it to |
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335 // the incremental collection set for the next evacuation |
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336 // pause. |
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337 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
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338 young_index_in_cset += 1; |
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339 } |
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340 assert((size_t) young_index_in_cset == _survivor_length, |
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341 "post-condition"); |
| 342 | 342 _g1h->g1_policy()->note_stop_adding_survivor_regions(); |
| 343 | |
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344 _head = _survivor_head; |
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345 _length = _survivor_length; |
| 342 | 346 if (_survivor_head != NULL) { |
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347 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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348 assert(_survivor_length > 0, "invariant"); |
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349 _survivor_tail->set_next_young_region(NULL); |
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350 } |
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351 |
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352 // Don't clear the survivor list handles until the start of |
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353 // the next evacuation pause - we need it in order to re-tag |
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354 // the survivor regions from this evacuation pause as 'young' |
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355 // at the start of the next. |
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356 |
| 545 | 357 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
| 342 | 358 |
| 359 assert(check_list_well_formed(), "young list should be well formed"); | |
| 360 } | |
| 361 | |
| 362 void YoungList::print() { | |
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363 HeapRegion* lists[] = {_head, _survivor_head}; |
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364 const char* names[] = {"YOUNG", "SURVIVOR"}; |
| 342 | 365 |
| 366 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
| 367 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
| 368 HeapRegion *curr = lists[list]; | |
| 369 if (curr == NULL) | |
| 370 gclog_or_tty->print_cr(" empty"); | |
| 371 while (curr != NULL) { | |
| 372 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
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373 "age: %4d, y: %d, surv: %d", |
| 342 | 374 curr->bottom(), curr->end(), |
| 375 curr->top(), | |
| 376 curr->prev_top_at_mark_start(), | |
| 377 curr->next_top_at_mark_start(), | |
| 378 curr->top_at_conc_mark_count(), | |
| 379 curr->age_in_surv_rate_group_cond(), | |
| 380 curr->is_young(), | |
| 381 curr->is_survivor()); | |
| 382 curr = curr->get_next_young_region(); | |
| 383 } | |
| 384 } | |
| 385 | |
| 386 gclog_or_tty->print_cr(""); | |
| 387 } | |
| 388 | |
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389 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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390 { |
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391 // Claim the right to put the region on the dirty cards region list |
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392 // by installing a self pointer. |
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393 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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394 if (next == NULL) { |
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395 HeapRegion* res = (HeapRegion*) |
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396 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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397 NULL); |
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398 if (res == NULL) { |
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399 HeapRegion* head; |
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400 do { |
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401 // Put the region to the dirty cards region list. |
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402 head = _dirty_cards_region_list; |
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403 next = (HeapRegion*) |
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404 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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405 if (next == head) { |
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406 assert(hr->get_next_dirty_cards_region() == hr, |
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407 "hr->get_next_dirty_cards_region() != hr"); |
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408 if (next == NULL) { |
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409 // The last region in the list points to itself. |
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410 hr->set_next_dirty_cards_region(hr); |
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411 } else { |
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412 hr->set_next_dirty_cards_region(next); |
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413 } |
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414 } |
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415 } while (next != head); |
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416 } |
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417 } |
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418 } |
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419 |
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420 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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421 { |
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422 HeapRegion* head; |
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423 HeapRegion* hr; |
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424 do { |
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425 head = _dirty_cards_region_list; |
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426 if (head == NULL) { |
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427 return NULL; |
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428 } |
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429 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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430 if (head == new_head) { |
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431 // The last region. |
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432 new_head = NULL; |
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433 } |
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434 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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435 head); |
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436 } while (hr != head); |
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437 assert(hr != NULL, "invariant"); |
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438 hr->set_next_dirty_cards_region(NULL); |
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439 return hr; |
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440 } |
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441 |
| 342 | 442 void G1CollectedHeap::stop_conc_gc_threads() { |
| 794 | 443 _cg1r->stop(); |
| 342 | 444 _cmThread->stop(); |
| 445 } | |
| 446 | |
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447 #ifdef ASSERT |
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448 // A region is added to the collection set as it is retired |
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449 // so an address p can point to a region which will be in the |
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450 // collection set but has not yet been retired. This method |
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451 // therefore is only accurate during a GC pause after all |
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452 // regions have been retired. It is used for debugging |
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453 // to check if an nmethod has references to objects that can |
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454 // be move during a partial collection. Though it can be |
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455 // inaccurate, it is sufficient for G1 because the conservative |
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456 // implementation of is_scavengable() for G1 will indicate that |
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457 // all nmethods must be scanned during a partial collection. |
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458 bool G1CollectedHeap::is_in_partial_collection(const void* p) { |
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459 HeapRegion* hr = heap_region_containing(p); |
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460 return hr != NULL && hr->in_collection_set(); |
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461 } |
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462 #endif |
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463 |
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464 // Returns true if the reference points to an object that |
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465 // can move in an incremental collecction. |
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466 bool G1CollectedHeap::is_scavengable(const void* p) { |
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467 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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468 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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469 HeapRegion* hr = heap_region_containing(p); |
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470 if (hr == NULL) { |
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471 // perm gen (or null) |
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472 return false; |
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473 } else { |
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474 return !hr->isHumongous(); |
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475 } |
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476 } |
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477 |
| 342 | 478 void G1CollectedHeap::check_ct_logs_at_safepoint() { |
| 479 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 480 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
| 481 | |
| 482 // Count the dirty cards at the start. | |
| 483 CountNonCleanMemRegionClosure count1(this); | |
| 484 ct_bs->mod_card_iterate(&count1); | |
| 485 int orig_count = count1.n(); | |
| 486 | |
| 487 // First clear the logged cards. | |
| 488 ClearLoggedCardTableEntryClosure clear; | |
| 489 dcqs.set_closure(&clear); | |
| 490 dcqs.apply_closure_to_all_completed_buffers(); | |
| 491 dcqs.iterate_closure_all_threads(false); | |
| 492 clear.print_histo(); | |
| 493 | |
| 494 // Now ensure that there's no dirty cards. | |
| 495 CountNonCleanMemRegionClosure count2(this); | |
| 496 ct_bs->mod_card_iterate(&count2); | |
| 497 if (count2.n() != 0) { | |
| 498 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
| 499 count2.n(), orig_count); | |
| 500 } | |
| 501 guarantee(count2.n() == 0, "Card table should be clean."); | |
| 502 | |
| 503 RedirtyLoggedCardTableEntryClosure redirty; | |
| 504 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
| 505 dcqs.apply_closure_to_all_completed_buffers(); | |
| 506 dcqs.iterate_closure_all_threads(false); | |
| 507 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
| 508 clear.calls(), orig_count); | |
| 509 guarantee(redirty.calls() == clear.calls(), | |
| 510 "Or else mechanism is broken."); | |
| 511 | |
| 512 CountNonCleanMemRegionClosure count3(this); | |
| 513 ct_bs->mod_card_iterate(&count3); | |
| 514 if (count3.n() != orig_count) { | |
| 515 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
| 516 orig_count, count3.n()); | |
| 517 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
| 518 } | |
| 519 | |
| 520 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 521 } | |
| 522 | |
| 523 // Private class members. | |
| 524 | |
| 525 G1CollectedHeap* G1CollectedHeap::_g1h; | |
| 526 | |
| 527 // Private methods. | |
| 528 | |
| 2152 | 529 HeapRegion* |
| 2361 | 530 G1CollectedHeap::new_region_try_secondary_free_list() { |
| 2152 | 531 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
| 532 while (!_secondary_free_list.is_empty() || free_regions_coming()) { | |
| 533 if (!_secondary_free_list.is_empty()) { | |
| 534 if (G1ConcRegionFreeingVerbose) { | |
| 535 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 536 "secondary_free_list has "SIZE_FORMAT" entries", | |
| 537 _secondary_free_list.length()); | |
| 538 } | |
| 539 // It looks as if there are free regions available on the | |
| 540 // secondary_free_list. Let's move them to the free_list and try | |
| 541 // again to allocate from it. | |
| 542 append_secondary_free_list(); | |
| 543 | |
| 544 assert(!_free_list.is_empty(), "if the secondary_free_list was not " | |
| 545 "empty we should have moved at least one entry to the free_list"); | |
| 546 HeapRegion* res = _free_list.remove_head(); | |
| 547 if (G1ConcRegionFreeingVerbose) { | |
| 548 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 549 "allocated "HR_FORMAT" from secondary_free_list", | |
| 550 HR_FORMAT_PARAMS(res)); | |
| 551 } | |
| 552 return res; | |
| 553 } | |
| 554 | |
| 555 // Wait here until we get notifed either when (a) there are no | |
| 556 // more free regions coming or (b) some regions have been moved on | |
| 557 // the secondary_free_list. | |
| 558 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 559 } | |
| 560 | |
| 561 if (G1ConcRegionFreeingVerbose) { | |
| 562 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 563 "could not allocate from secondary_free_list"); | |
| 564 } | |
| 565 return NULL; | |
| 566 } | |
| 567 | |
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568 HeapRegion* G1CollectedHeap::new_region(size_t word_size, bool do_expand) { |
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569 assert(!isHumongous(word_size) || word_size <= HeapRegion::GrainWords, |
| 2152 | 570 "the only time we use this to allocate a humongous region is " |
| 571 "when we are allocating a single humongous region"); | |
| 572 | |
| 573 HeapRegion* res; | |
| 574 if (G1StressConcRegionFreeing) { | |
| 575 if (!_secondary_free_list.is_empty()) { | |
| 576 if (G1ConcRegionFreeingVerbose) { | |
| 577 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 578 "forced to look at the secondary_free_list"); | |
| 579 } | |
| 2361 | 580 res = new_region_try_secondary_free_list(); |
| 2152 | 581 if (res != NULL) { |
| 582 return res; | |
| 583 } | |
| 584 } | |
| 585 } | |
| 586 res = _free_list.remove_head_or_null(); | |
| 587 if (res == NULL) { | |
| 588 if (G1ConcRegionFreeingVerbose) { | |
| 589 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 590 "res == NULL, trying the secondary_free_list"); | |
| 591 } | |
| 2361 | 592 res = new_region_try_secondary_free_list(); |
| 2152 | 593 } |
| 342 | 594 if (res == NULL && do_expand) { |
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595 ergo_verbose1(ErgoHeapSizing, |
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596 "attempt heap expansion", |
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597 ergo_format_reason("region allocation request failed") |
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598 ergo_format_byte("allocation request"), |
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599 word_size * HeapWordSize); |
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600 if (expand(word_size * HeapWordSize)) { |
| 3766 | 601 // Even though the heap was expanded, it might not have reached |
| 602 // the desired size. So, we cannot assume that the allocation | |
| 603 // will succeed. | |
| 604 res = _free_list.remove_head_or_null(); | |
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605 } |
| 342 | 606 } |
| 607 return res; | |
| 608 } | |
| 609 | |
| 3766 | 610 size_t G1CollectedHeap::humongous_obj_allocate_find_first(size_t num_regions, |
| 611 size_t word_size) { | |
| 2361 | 612 assert(isHumongous(word_size), "word_size should be humongous"); |
| 613 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
| 614 | |
| 3766 | 615 size_t first = G1_NULL_HRS_INDEX; |
| 2152 | 616 if (num_regions == 1) { |
| 617 // Only one region to allocate, no need to go through the slower | |
| 618 // path. The caller will attempt the expasion if this fails, so | |
| 619 // let's not try to expand here too. | |
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620 HeapRegion* hr = new_region(word_size, false /* do_expand */); |
| 2152 | 621 if (hr != NULL) { |
| 622 first = hr->hrs_index(); | |
| 623 } else { | |
| 3766 | 624 first = G1_NULL_HRS_INDEX; |
| 2152 | 625 } |
| 626 } else { | |
| 627 // We can't allocate humongous regions while cleanupComplete() is | |
| 628 // running, since some of the regions we find to be empty might not | |
| 629 // yet be added to the free list and it is not straightforward to | |
| 630 // know which list they are on so that we can remove them. Note | |
| 631 // that we only need to do this if we need to allocate more than | |
| 632 // one region to satisfy the current humongous allocation | |
| 633 // request. If we are only allocating one region we use the common | |
| 634 // region allocation code (see above). | |
| 635 wait_while_free_regions_coming(); | |
| 2361 | 636 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 637 |
| 638 if (free_regions() >= num_regions) { | |
| 3766 | 639 first = _hrs.find_contiguous(num_regions); |
| 640 if (first != G1_NULL_HRS_INDEX) { | |
| 641 for (size_t i = first; i < first + num_regions; ++i) { | |
| 642 HeapRegion* hr = region_at(i); | |
| 2152 | 643 assert(hr->is_empty(), "sanity"); |
| 2361 | 644 assert(is_on_master_free_list(hr), "sanity"); |
| 2152 | 645 hr->set_pending_removal(true); |
| 646 } | |
| 647 _free_list.remove_all_pending(num_regions); | |
| 648 } | |
| 649 } | |
| 650 } | |
| 651 return first; | |
| 652 } | |
| 653 | |
| 2361 | 654 HeapWord* |
| 3766 | 655 G1CollectedHeap::humongous_obj_allocate_initialize_regions(size_t first, |
| 2361 | 656 size_t num_regions, |
| 657 size_t word_size) { | |
| 3766 | 658 assert(first != G1_NULL_HRS_INDEX, "pre-condition"); |
| 2361 | 659 assert(isHumongous(word_size), "word_size should be humongous"); |
| 660 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
| 661 | |
| 662 // Index of last region in the series + 1. | |
| 3766 | 663 size_t last = first + num_regions; |
| 2361 | 664 |
| 665 // We need to initialize the region(s) we just discovered. This is | |
| 666 // a bit tricky given that it can happen concurrently with | |
| 667 // refinement threads refining cards on these regions and | |
| 668 // potentially wanting to refine the BOT as they are scanning | |
| 669 // those cards (this can happen shortly after a cleanup; see CR | |
| 670 // 6991377). So we have to set up the region(s) carefully and in | |
| 671 // a specific order. | |
| 672 | |
| 673 // The word size sum of all the regions we will allocate. | |
| 674 size_t word_size_sum = num_regions * HeapRegion::GrainWords; | |
| 675 assert(word_size <= word_size_sum, "sanity"); | |
| 676 | |
| 677 // This will be the "starts humongous" region. | |
| 3766 | 678 HeapRegion* first_hr = region_at(first); |
| 2361 | 679 // The header of the new object will be placed at the bottom of |
| 680 // the first region. | |
| 681 HeapWord* new_obj = first_hr->bottom(); | |
| 682 // This will be the new end of the first region in the series that | |
| 683 // should also match the end of the last region in the seriers. | |
| 684 HeapWord* new_end = new_obj + word_size_sum; | |
| 685 // This will be the new top of the first region that will reflect | |
| 686 // this allocation. | |
| 687 HeapWord* new_top = new_obj + word_size; | |
| 688 | |
| 689 // First, we need to zero the header of the space that we will be | |
| 690 // allocating. When we update top further down, some refinement | |
| 691 // threads might try to scan the region. By zeroing the header we | |
| 692 // ensure that any thread that will try to scan the region will | |
| 693 // come across the zero klass word and bail out. | |
| 694 // | |
| 695 // NOTE: It would not have been correct to have used | |
| 696 // CollectedHeap::fill_with_object() and make the space look like | |
| 697 // an int array. The thread that is doing the allocation will | |
| 698 // later update the object header to a potentially different array | |
| 699 // type and, for a very short period of time, the klass and length | |
| 700 // fields will be inconsistent. This could cause a refinement | |
| 701 // thread to calculate the object size incorrectly. | |
| 702 Copy::fill_to_words(new_obj, oopDesc::header_size(), 0); | |
| 703 | |
| 704 // We will set up the first region as "starts humongous". This | |
| 705 // will also update the BOT covering all the regions to reflect | |
| 706 // that there is a single object that starts at the bottom of the | |
| 707 // first region. | |
| 708 first_hr->set_startsHumongous(new_top, new_end); | |
| 709 | |
| 710 // Then, if there are any, we will set up the "continues | |
| 711 // humongous" regions. | |
| 712 HeapRegion* hr = NULL; | |
| 3766 | 713 for (size_t i = first + 1; i < last; ++i) { |
| 714 hr = region_at(i); | |
| 2361 | 715 hr->set_continuesHumongous(first_hr); |
| 716 } | |
| 717 // If we have "continues humongous" regions (hr != NULL), then the | |
| 718 // end of the last one should match new_end. | |
| 719 assert(hr == NULL || hr->end() == new_end, "sanity"); | |
| 720 | |
| 721 // Up to this point no concurrent thread would have been able to | |
| 722 // do any scanning on any region in this series. All the top | |
| 723 // fields still point to bottom, so the intersection between | |
| 724 // [bottom,top] and [card_start,card_end] will be empty. Before we | |
| 725 // update the top fields, we'll do a storestore to make sure that | |
| 726 // no thread sees the update to top before the zeroing of the | |
| 727 // object header and the BOT initialization. | |
| 728 OrderAccess::storestore(); | |
| 729 | |
| 730 // Now that the BOT and the object header have been initialized, | |
| 731 // we can update top of the "starts humongous" region. | |
| 732 assert(first_hr->bottom() < new_top && new_top <= first_hr->end(), | |
| 733 "new_top should be in this region"); | |
| 734 first_hr->set_top(new_top); | |
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735 if (_hr_printer.is_active()) { |
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736 HeapWord* bottom = first_hr->bottom(); |
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737 HeapWord* end = first_hr->orig_end(); |
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738 if ((first + 1) == last) { |
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739 // the series has a single humongous region |
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740 _hr_printer.alloc(G1HRPrinter::SingleHumongous, first_hr, new_top); |
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741 } else { |
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742 // the series has more than one humongous regions |
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743 _hr_printer.alloc(G1HRPrinter::StartsHumongous, first_hr, end); |
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744 } |
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745 } |
| 2361 | 746 |
| 747 // Now, we will update the top fields of the "continues humongous" | |
| 748 // regions. The reason we need to do this is that, otherwise, | |
| 749 // these regions would look empty and this will confuse parts of | |
| 750 // G1. For example, the code that looks for a consecutive number | |
| 751 // of empty regions will consider them empty and try to | |
| 752 // re-allocate them. We can extend is_empty() to also include | |
| 753 // !continuesHumongous(), but it is easier to just update the top | |
| 754 // fields here. The way we set top for all regions (i.e., top == | |
| 755 // end for all regions but the last one, top == new_top for the | |
| 756 // last one) is actually used when we will free up the humongous | |
| 757 // region in free_humongous_region(). | |
| 758 hr = NULL; | |
| 3766 | 759 for (size_t i = first + 1; i < last; ++i) { |
| 760 hr = region_at(i); | |
| 2361 | 761 if ((i + 1) == last) { |
| 762 // last continues humongous region | |
| 763 assert(hr->bottom() < new_top && new_top <= hr->end(), | |
| 764 "new_top should fall on this region"); | |
| 765 hr->set_top(new_top); | |
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766 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, new_top); |
| 2361 | 767 } else { |
| 768 // not last one | |
| 769 assert(new_top > hr->end(), "new_top should be above this region"); | |
| 770 hr->set_top(hr->end()); | |
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771 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, hr->end()); |
| 2361 | 772 } |
| 773 } | |
| 774 // If we have continues humongous regions (hr != NULL), then the | |
| 775 // end of the last one should match new_end and its top should | |
| 776 // match new_top. | |
| 777 assert(hr == NULL || | |
| 778 (hr->end() == new_end && hr->top() == new_top), "sanity"); | |
| 779 | |
| 780 assert(first_hr->used() == word_size * HeapWordSize, "invariant"); | |
| 781 _summary_bytes_used += first_hr->used(); | |
| 782 _humongous_set.add(first_hr); | |
| 783 | |
| 784 return new_obj; | |
| 785 } | |
| 786 | |
| 342 | 787 // If could fit into free regions w/o expansion, try. |
| 788 // Otherwise, if can expand, do so. | |
| 789 // Otherwise, if using ex regions might help, try with ex given back. | |
| 1973 | 790 HeapWord* G1CollectedHeap::humongous_obj_allocate(size_t word_size) { |
| 2152 | 791 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
| 792 | |
| 793 verify_region_sets_optional(); | |
| 342 | 794 |
| 795 size_t num_regions = | |
| 1973 | 796 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; |
| 342 | 797 size_t x_size = expansion_regions(); |
| 3766 | 798 size_t fs = _hrs.free_suffix(); |
| 799 size_t first = humongous_obj_allocate_find_first(num_regions, word_size); | |
| 800 if (first == G1_NULL_HRS_INDEX) { | |
| 2152 | 801 // The only thing we can do now is attempt expansion. |
| 342 | 802 if (fs + x_size >= num_regions) { |
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803 // If the number of regions we're trying to allocate for this |
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804 // object is at most the number of regions in the free suffix, |
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805 // then the call to humongous_obj_allocate_find_first() above |
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806 // should have succeeded and we wouldn't be here. |
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807 // |
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808 // We should only be trying to expand when the free suffix is |
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809 // not sufficient for the object _and_ we have some expansion |
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810 // room available. |
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811 assert(num_regions > fs, "earlier allocation should have succeeded"); |
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812 |
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813 ergo_verbose1(ErgoHeapSizing, |
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814 "attempt heap expansion", |
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815 ergo_format_reason("humongous allocation request failed") |
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816 ergo_format_byte("allocation request"), |
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817 word_size * HeapWordSize); |
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818 if (expand((num_regions - fs) * HeapRegion::GrainBytes)) { |
| 3766 | 819 // Even though the heap was expanded, it might not have |
| 820 // reached the desired size. So, we cannot assume that the | |
| 821 // allocation will succeed. | |
|
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
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2173
diff
changeset
|
822 first = humongous_obj_allocate_find_first(num_regions, word_size); |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
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2173
diff
changeset
|
823 } |
| 2152 | 824 } |
| 825 } | |
| 826 | |
| 2361 | 827 HeapWord* result = NULL; |
| 3766 | 828 if (first != G1_NULL_HRS_INDEX) { |
| 2361 | 829 result = |
| 830 humongous_obj_allocate_initialize_regions(first, num_regions, word_size); | |
| 831 assert(result != NULL, "it should always return a valid result"); | |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
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|
832 |
|
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
833 // A successful humongous object allocation changes the used space |
|
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
834 // information of the old generation so we need to recalculate the |
|
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
835 // sizes and update the jstat counters here. |
|
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
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parents:
3979
diff
changeset
|
836 g1mm()->update_sizes(); |
| 2152 | 837 } |
| 838 | |
| 839 verify_region_sets_optional(); | |
| 2361 | 840 |
| 841 return result; | |
| 342 | 842 } |
| 843 | |
| 1973 | 844 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
| 845 assert_heap_not_locked_and_not_at_safepoint(); | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
846 assert(!isHumongous(word_size), "we do not allow humongous TLABs"); |
|
abdfc822206f
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tonyp
parents:
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|
847 |
|
abdfc822206f
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parents:
2432
diff
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|
848 unsigned int dummy_gc_count_before; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
diff
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|
849 return attempt_allocation(word_size, &dummy_gc_count_before); |
| 342 | 850 } |
| 851 | |
| 852 HeapWord* | |
| 853 G1CollectedHeap::mem_allocate(size_t word_size, | |
| 1973 | 854 bool* gc_overhead_limit_was_exceeded) { |
| 855 assert_heap_not_locked_and_not_at_safepoint(); | |
| 342 | 856 |
|
2433
abdfc822206f
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2432
diff
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|
857 // Loop until the allocation is satisified, or unsatisfied after GC. |
| 1973 | 858 for (int try_count = 1; /* we'll return */; try_count += 1) { |
| 859 unsigned int gc_count_before; | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
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|
860 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
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|
861 HeapWord* result = NULL; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
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diff
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|
862 if (!isHumongous(word_size)) { |
|
abdfc822206f
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diff
changeset
|
863 result = attempt_allocation(word_size, &gc_count_before); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
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|
864 } else { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
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|
865 result = attempt_allocation_humongous(word_size, &gc_count_before); |
|
abdfc822206f
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tonyp
parents:
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|
866 } |
|
abdfc822206f
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tonyp
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diff
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|
867 if (result != NULL) { |
|
abdfc822206f
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|
868 return result; |
| 342 | 869 } |
| 870 | |
| 871 // Create the garbage collection operation... | |
| 1973 | 872 VM_G1CollectForAllocation op(gc_count_before, word_size); |
| 342 | 873 // ...and get the VM thread to execute it. |
| 874 VMThread::execute(&op); | |
| 1973 | 875 |
| 876 if (op.prologue_succeeded() && op.pause_succeeded()) { | |
| 877 // If the operation was successful we'll return the result even | |
| 878 // if it is NULL. If the allocation attempt failed immediately | |
| 879 // after a Full GC, it's unlikely we'll be able to allocate now. | |
| 880 HeapWord* result = op.result(); | |
| 881 if (result != NULL && !isHumongous(word_size)) { | |
| 882 // Allocations that take place on VM operations do not do any | |
| 883 // card dirtying and we have to do it here. We only have to do | |
| 884 // this for non-humongous allocations, though. | |
| 885 dirty_young_block(result, word_size); | |
| 886 } | |
| 342 | 887 return result; |
| 1973 | 888 } else { |
| 889 assert(op.result() == NULL, | |
| 890 "the result should be NULL if the VM op did not succeed"); | |
| 342 | 891 } |
| 892 | |
| 893 // Give a warning if we seem to be looping forever. | |
| 894 if ((QueuedAllocationWarningCount > 0) && | |
| 895 (try_count % QueuedAllocationWarningCount == 0)) { | |
| 1973 | 896 warning("G1CollectedHeap::mem_allocate retries %d times", try_count); |
| 342 | 897 } |
| 898 } | |
| 1973 | 899 |
| 900 ShouldNotReachHere(); | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
901 return NULL; |
| 342 | 902 } |
| 903 | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
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|
904 HeapWord* G1CollectedHeap::attempt_allocation_slow(size_t word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
905 unsigned int *gc_count_before_ret) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
906 // Make sure you read the note in attempt_allocation_humongous(). |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
907 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
908 assert_heap_not_locked_and_not_at_safepoint(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
909 assert(!isHumongous(word_size), "attempt_allocation_slow() should not " |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
910 "be called for humongous allocation requests"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
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|
911 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
912 // We should only get here after the first-level allocation attempt |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
913 // (attempt_allocation()) failed to allocate. |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
914 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
915 // We will loop until a) we manage to successfully perform the |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
916 // allocation or b) we successfully schedule a collection which |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
917 // fails to perform the allocation. b) is the only case when we'll |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
918 // return NULL. |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
919 HeapWord* result = NULL; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
920 for (int try_count = 1; /* we'll return */; try_count += 1) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
921 bool should_try_gc; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
922 unsigned int gc_count_before; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
923 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
924 { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
925 MutexLockerEx x(Heap_lock); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
926 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
927 result = _mutator_alloc_region.attempt_allocation_locked(word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
928 false /* bot_updates */); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
929 if (result != NULL) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
930 return result; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
931 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
932 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
933 // If we reach here, attempt_allocation_locked() above failed to |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
934 // allocate a new region. So the mutator alloc region should be NULL. |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
935 assert(_mutator_alloc_region.get() == NULL, "only way to get here"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
936 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
937 if (GC_locker::is_active_and_needs_gc()) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
938 if (g1_policy()->can_expand_young_list()) { |
|
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3886
diff
changeset
|
939 // No need for an ergo verbose message here, |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3886
diff
changeset
|
940 // can_expand_young_list() does this when it returns true. |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
941 result = _mutator_alloc_region.attempt_allocation_force(word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
942 false /* bot_updates */); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
943 if (result != NULL) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
944 return result; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
945 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
946 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
947 should_try_gc = false; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
948 } else { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
949 // Read the GC count while still holding the Heap_lock. |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
950 gc_count_before = SharedHeap::heap()->total_collections(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
951 should_try_gc = true; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
952 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
953 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
954 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
955 if (should_try_gc) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
956 bool succeeded; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
957 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
958 if (result != NULL) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
959 assert(succeeded, "only way to get back a non-NULL result"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
960 return result; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
961 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
962 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
963 if (succeeded) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
964 // If we get here we successfully scheduled a collection which |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
965 // failed to allocate. No point in trying to allocate |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
966 // further. We'll just return NULL. |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
967 MutexLockerEx x(Heap_lock); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
968 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
969 return NULL; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
970 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
971 } else { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
972 GC_locker::stall_until_clear(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
973 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
974 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
975 // We can reach here if we were unsuccessul in scheduling a |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
976 // collection (because another thread beat us to it) or if we were |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
977 // stalled due to the GC locker. In either can we should retry the |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
978 // allocation attempt in case another thread successfully |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
979 // performed a collection and reclaimed enough space. We do the |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
980 // first attempt (without holding the Heap_lock) here and the |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
981 // follow-on attempt will be at the start of the next loop |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
982 // iteration (after taking the Heap_lock). |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
983 result = _mutator_alloc_region.attempt_allocation(word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
984 false /* bot_updates */); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
985 if (result != NULL ){ |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
986 return result; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
987 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
988 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
989 // Give a warning if we seem to be looping forever. |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
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|
990 if ((QueuedAllocationWarningCount > 0) && |
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991 (try_count % QueuedAllocationWarningCount == 0)) { |
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992 warning("G1CollectedHeap::attempt_allocation_slow() " |
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993 "retries %d times", try_count); |
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994 } |
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995 } |
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996 |
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997 ShouldNotReachHere(); |
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998 return NULL; |
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999 } |
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1000 |
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1001 HeapWord* G1CollectedHeap::attempt_allocation_humongous(size_t word_size, |
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1002 unsigned int * gc_count_before_ret) { |
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1003 // The structure of this method has a lot of similarities to |
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1004 // attempt_allocation_slow(). The reason these two were not merged |
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1005 // into a single one is that such a method would require several "if |
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1006 // allocation is not humongous do this, otherwise do that" |
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1007 // conditional paths which would obscure its flow. In fact, an early |
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1008 // version of this code did use a unified method which was harder to |
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1009 // follow and, as a result, it had subtle bugs that were hard to |
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1010 // track down. So keeping these two methods separate allows each to |
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1011 // be more readable. It will be good to keep these two in sync as |
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1012 // much as possible. |
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1013 |
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1014 assert_heap_not_locked_and_not_at_safepoint(); |
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1015 assert(isHumongous(word_size), "attempt_allocation_humongous() " |
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1016 "should only be called for humongous allocations"); |
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1017 |
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1018 // We will loop until a) we manage to successfully perform the |
|
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1019 // allocation or b) we successfully schedule a collection which |
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1020 // fails to perform the allocation. b) is the only case when we'll |
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1021 // return NULL. |
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1022 HeapWord* result = NULL; |
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1023 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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1024 bool should_try_gc; |
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1025 unsigned int gc_count_before; |
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1026 |
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1027 { |
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1028 MutexLockerEx x(Heap_lock); |
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1029 |
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1030 // Given that humongous objects are not allocated in young |
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1031 // regions, we'll first try to do the allocation without doing a |
|
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1032 // collection hoping that there's enough space in the heap. |
|
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1033 result = humongous_obj_allocate(word_size); |
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1034 if (result != NULL) { |
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1035 return result; |
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1036 } |
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1037 |
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1038 if (GC_locker::is_active_and_needs_gc()) { |
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1039 should_try_gc = false; |
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1040 } else { |
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1041 // Read the GC count while still holding the Heap_lock. |
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1042 gc_count_before = SharedHeap::heap()->total_collections(); |
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1043 should_try_gc = true; |
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1044 } |
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1045 } |
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1046 |
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1047 if (should_try_gc) { |
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1048 // If we failed to allocate the humongous object, we should try to |
|
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1049 // do a collection pause (if we're allowed) in case it reclaims |
|
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1050 // enough space for the allocation to succeed after the pause. |
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1051 |
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1052 bool succeeded; |
|
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1053 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
|
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1054 if (result != NULL) { |
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1055 assert(succeeded, "only way to get back a non-NULL result"); |
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1056 return result; |
|
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1057 } |
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1058 |
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1059 if (succeeded) { |
|
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1060 // If we get here we successfully scheduled a collection which |
|
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1061 // failed to allocate. No point in trying to allocate |
|
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1062 // further. We'll just return NULL. |
|
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1063 MutexLockerEx x(Heap_lock); |
|
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1064 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
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1065 return NULL; |
|
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1066 } |
|
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1067 } else { |
|
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1068 GC_locker::stall_until_clear(); |
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1069 } |
|
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1070 |
|
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1071 // We can reach here if we were unsuccessul in scheduling a |
|
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1072 // collection (because another thread beat us to it) or if we were |
|
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1073 // stalled due to the GC locker. In either can we should retry the |
|
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1074 // allocation attempt in case another thread successfully |
|
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1075 // performed a collection and reclaimed enough space. Give a |
|
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1076 // warning if we seem to be looping forever. |
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1077 |
|
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1078 if ((QueuedAllocationWarningCount > 0) && |
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1079 (try_count % QueuedAllocationWarningCount == 0)) { |
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1080 warning("G1CollectedHeap::attempt_allocation_humongous() " |
|
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1081 "retries %d times", try_count); |
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1082 } |
|
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1083 } |
|
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1084 |
|
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1085 ShouldNotReachHere(); |
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1086 return NULL; |
|
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1087 } |
|
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1088 |
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1089 HeapWord* G1CollectedHeap::attempt_allocation_at_safepoint(size_t word_size, |
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1090 bool expect_null_mutator_alloc_region) { |
| 2152 | 1091 assert_at_safepoint(true /* should_be_vm_thread */); |
|
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1092 assert(_mutator_alloc_region.get() == NULL || |
|
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1093 !expect_null_mutator_alloc_region, |
|
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1094 "the current alloc region was unexpectedly found to be non-NULL"); |
|
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1095 |
|
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1096 if (!isHumongous(word_size)) { |
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1097 return _mutator_alloc_region.attempt_allocation_locked(word_size, |
|
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1098 false /* bot_updates */); |
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1099 } else { |
|
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1100 return humongous_obj_allocate(word_size); |
|
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1101 } |
|
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1102 |
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1103 ShouldNotReachHere(); |
| 342 | 1104 } |
| 1105 | |
| 1106 class PostMCRemSetClearClosure: public HeapRegionClosure { | |
| 1107 ModRefBarrierSet* _mr_bs; | |
| 1108 public: | |
| 1109 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 1110 bool doHeapRegion(HeapRegion* r) { | |
| 1111 r->reset_gc_time_stamp(); | |
| 1112 if (r->continuesHumongous()) | |
| 1113 return false; | |
| 1114 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 1115 if (hrrs != NULL) hrrs->clear(); | |
| 1116 // You might think here that we could clear just the cards | |
| 1117 // corresponding to the used region. But no: if we leave a dirty card | |
| 1118 // in a region we might allocate into, then it would prevent that card | |
| 1119 // from being enqueued, and cause it to be missed. | |
| 1120 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
| 1121 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
| 1122 return false; | |
| 1123 } | |
| 1124 }; | |
| 1125 | |
| 1126 | |
| 1127 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
| 1128 ModRefBarrierSet* _mr_bs; | |
| 1129 public: | |
| 1130 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 1131 bool doHeapRegion(HeapRegion* r) { | |
| 1132 if (r->continuesHumongous()) return false; | |
| 1133 if (r->used_region().word_size() != 0) { | |
| 1134 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
| 1135 } | |
| 1136 return false; | |
| 1137 } | |
| 1138 }; | |
| 1139 | |
|
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1140 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
|
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1141 G1CollectedHeap* _g1h; |
|
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1142 UpdateRSOopClosure _cl; |
|
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|
1143 int _worker_i; |
|
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|
1144 public: |
|
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|
1145 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
| 1861 | 1146 _cl(g1->g1_rem_set(), worker_i), |
|
626
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|
1147 _worker_i(worker_i), |
|
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|
1148 _g1h(g1) |
|
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|
1149 { } |
|
1960
878b57474103
6978187: G1: assert(ParallelGCThreads> 1 || n_yielded() == _hrrs->occupied()) strikes again
johnc
parents:
1883
diff
changeset
|
1150 |
|
626
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|
1151 bool doHeapRegion(HeapRegion* r) { |
|
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1152 if (!r->continuesHumongous()) { |
|
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|
1153 _cl.set_from(r); |
|
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|
1154 r->oop_iterate(&_cl); |
|
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|
1155 } |
|
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|
1156 return false; |
|
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|
1157 } |
|
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|
1158 }; |
|
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|
1159 |
|
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|
1160 class ParRebuildRSTask: public AbstractGangTask { |
|
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1161 G1CollectedHeap* _g1; |
|
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1162 public: |
|
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|
1163 ParRebuildRSTask(G1CollectedHeap* g1) |
|
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1164 : AbstractGangTask("ParRebuildRSTask"), |
|
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|
1165 _g1(g1) |
|
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|
1166 { } |
|
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|
1167 |
|
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|
1168 void work(int i) { |
|
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|
1169 RebuildRSOutOfRegionClosure rebuild_rs(_g1, i); |
|
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|
1170 _g1->heap_region_par_iterate_chunked(&rebuild_rs, i, |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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|
1171 _g1->workers()->active_workers(), |
|
626
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1172 HeapRegion::RebuildRSClaimValue); |
|
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1173 } |
|
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1174 }; |
|
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|
1175 |
|
3778
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|
1176 class PostCompactionPrinterClosure: public HeapRegionClosure { |
|
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1177 private: |
|
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|
1178 G1HRPrinter* _hr_printer; |
|
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|
1179 public: |
|
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|
1180 bool doHeapRegion(HeapRegion* hr) { |
|
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|
1181 assert(!hr->is_young(), "not expecting to find young regions"); |
|
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|
1182 // We only generate output for non-empty regions. |
|
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1183 if (!hr->is_empty()) { |
|
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1184 if (!hr->isHumongous()) { |
|
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|
1185 _hr_printer->post_compaction(hr, G1HRPrinter::Old); |
|
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|
1186 } else if (hr->startsHumongous()) { |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3983
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changeset
|
1187 if (hr->capacity() == HeapRegion::GrainBytes) { |
|
3778
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1188 // single humongous region |
|
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|
1189 _hr_printer->post_compaction(hr, G1HRPrinter::SingleHumongous); |
|
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|
1190 } else { |
|
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|
1191 _hr_printer->post_compaction(hr, G1HRPrinter::StartsHumongous); |
|
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1192 } |
|
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1193 } else { |
|
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|
1194 assert(hr->continuesHumongous(), "only way to get here"); |
|
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|
1195 _hr_printer->post_compaction(hr, G1HRPrinter::ContinuesHumongous); |
|
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|
1196 } |
|
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|
1197 } |
|
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|
1198 return false; |
|
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|
1199 } |
|
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|
1200 |
|
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|
1201 PostCompactionPrinterClosure(G1HRPrinter* hr_printer) |
|
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|
1202 : _hr_printer(hr_printer) { } |
|
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|
1203 }; |
|
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|
1204 |
| 1973 | 1205 bool G1CollectedHeap::do_collection(bool explicit_gc, |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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parents:
1611
diff
changeset
|
1206 bool clear_all_soft_refs, |
| 342 | 1207 size_t word_size) { |
| 2152 | 1208 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1209 | |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
1210 if (GC_locker::check_active_before_gc()) { |
| 1973 | 1211 return false; |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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|
1212 } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
1213 |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2039
diff
changeset
|
1214 SvcGCMarker sgcm(SvcGCMarker::FULL); |
| 342 | 1215 ResourceMark rm; |
| 1216 | |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
changeset
|
1217 if (PrintHeapAtGC) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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changeset
|
1218 Universe::print_heap_before_gc(); |
|
0316eac49d5a
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|
1219 } |
|
0316eac49d5a
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|
1220 |
| 4072 | 1221 HRSPhaseSetter x(HRSPhaseFullGC); |
| 2152 | 1222 verify_region_sets_optional(); |
| 342 | 1223 |
|
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
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1360
diff
changeset
|
1224 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
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1360
diff
changeset
|
1225 collector_policy()->should_clear_all_soft_refs(); |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
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1360
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|
1226 |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
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1360
diff
changeset
|
1227 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
|
0bfd3fb24150
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|
1228 |
| 342 | 1229 { |
| 1230 IsGCActiveMark x; | |
| 1231 | |
| 1232 // Timing | |
|
1656
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diff
changeset
|
1233 bool system_gc = (gc_cause() == GCCause::_java_lang_system_gc); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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changeset
|
1234 assert(!system_gc || explicit_gc, "invariant"); |
| 342 | 1235 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
| 1236 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
changeset
|
1237 TraceTime t(system_gc ? "Full GC (System.gc())" : "Full GC", |
|
1387
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diff
changeset
|
1238 PrintGC, true, gclog_or_tty); |
| 342 | 1239 |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
1240 TraceCollectorStats tcs(g1mm()->full_collection_counters()); |
|
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
1241 TraceMemoryManagerStats tms(true /* fullGC */, gc_cause()); |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
1242 |
| 342 | 1243 double start = os::elapsedTime(); |
| 1244 g1_policy()->record_full_collection_start(); | |
| 1245 | |
| 2152 | 1246 wait_while_free_regions_coming(); |
| 2361 | 1247 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 1248 |
| 342 | 1249 gc_prologue(true); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
1250 increment_total_collections(true /* full gc */); |
| 342 | 1251 |
| 1252 size_t g1h_prev_used = used(); | |
| 1253 assert(used() == recalculate_used(), "Should be equal"); | |
| 1254 | |
| 1255 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
| 1256 HandleMark hm; // Discard invalid handles created during verification | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
1257 gclog_or_tty->print(" VerifyBeforeGC:"); |
| 342 | 1258 prepare_for_verify(); |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3766
diff
changeset
|
1259 Universe::verify(/* allow dirty */ true, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
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changeset
|
1260 /* silent */ false, |
|
6747fd0512e0
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johnc
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changeset
|
1261 /* option */ VerifyOption_G1UsePrevMarking); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
changeset
|
1262 |
| 342 | 1263 } |
|
3869
7f776886a215
6810861: G1: support -XX:+{PrintClassHistogram,HeapDump}{Before,After}FullGC
ysr
parents:
3867
diff
changeset
|
1264 pre_full_gc_dump(); |
| 342 | 1265 |
| 1266 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 1267 | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1268 // Disable discovery and empty the discovered lists |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1269 // for the CM ref processor. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1270 ref_processor_cm()->disable_discovery(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
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changeset
|
1271 ref_processor_cm()->abandon_partial_discovery(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
1272 ref_processor_cm()->verify_no_references_recorded(); |
| 342 | 1273 |
| 1274 // Abandon current iterations of concurrent marking and concurrent | |
| 1275 // refinement, if any are in progress. | |
| 1276 concurrent_mark()->abort(); | |
| 1277 | |
| 1278 // Make sure we'll choose a new allocation region afterwards. | |
|
2433
abdfc822206f
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tonyp
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diff
changeset
|
1279 release_mutator_alloc_region(); |
| 636 | 1280 abandon_gc_alloc_regions(); |
| 1861 | 1281 g1_rem_set()->cleanupHRRS(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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changeset
|
1282 |
|
3778
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|
1283 // We should call this after we retire any currently active alloc |
|
5f6f2615433a
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|
1284 // regions so that all the ALLOC / RETIRE events are generated |
|
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|
1285 // before the start GC event. |
|
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|
1286 _hr_printer.start_gc(true /* full */, (size_t) total_collections()); |
|
5f6f2615433a
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|
1287 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1288 // We may have added regions to the current incremental collection |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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1391
diff
changeset
|
1289 // set between the last GC or pause and now. We need to clear the |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1290 // incremental collection set and then start rebuilding it afresh |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1291 // after this full GC. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
1292 abandon_collection_set(g1_policy()->inc_cset_head()); |
|
1316cec51b4d
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1293 g1_policy()->clear_incremental_cset(); |
|
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|
1294 g1_policy()->stop_incremental_cset_building(); |
|
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|
1295 |
| 4072 | 1296 tear_down_region_sets(false /* free_list_only */); |
|
3867
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|
1297 g1_policy()->set_full_young_gcs(true); |
| 342 | 1298 |
|
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1299 // See the comments in g1CollectedHeap.hpp and |
|
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1300 // G1CollectedHeap::ref_processing_init() about |
|
1974
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|
1301 // how reference processing currently works in G1. |
|
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|
1302 |
|
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|
1303 // Temporarily make discovery by the STW ref processor single threaded (non-MT). |
|
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|
1304 ReferenceProcessorMTDiscoveryMutator stw_rp_disc_ser(ref_processor_stw(), false); |
|
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|
1305 |
|
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|
1306 // Temporarily clear the STW ref processor's _is_alive_non_header field. |
|
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|
1307 ReferenceProcessorIsAliveMutator stw_rp_is_alive_null(ref_processor_stw(), NULL); |
|
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|
1308 |
|
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|
1309 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
|
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|
1310 ref_processor_stw()->setup_policy(do_clear_all_soft_refs); |
|
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|
1311 |
| 342 | 1312 // Do collection work |
| 1313 { | |
| 1314 HandleMark hm; // Discard invalid handles created during gc | |
|
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|
1315 G1MarkSweep::invoke_at_safepoint(ref_processor_stw(), do_clear_all_soft_refs); |
| 342 | 1316 } |
|
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|
1317 |
| 2152 | 1318 assert(free_regions() == 0, "we should not have added any free regions"); |
| 4072 | 1319 rebuild_region_sets(false /* free_list_only */); |
| 342 | 1320 |
|
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|
1321 // Enqueue any discovered reference objects that have |
|
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|
1322 // not been removed from the discovered lists. |
|
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|
1323 ref_processor_stw()->enqueue_discovered_references(); |
| 342 | 1324 |
| 1325 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 1326 | |
|
1089
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|
1327 MemoryService::track_memory_usage(); |
|
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|
1328 |
| 342 | 1329 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
| 1330 HandleMark hm; // Discard invalid handles created during verification | |
| 1331 gclog_or_tty->print(" VerifyAfterGC:"); | |
|
637
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|
1332 prepare_for_verify(); |
|
3772
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|
1333 Universe::verify(/* allow dirty */ false, |
|
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|
1334 /* silent */ false, |
|
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|
1335 /* option */ VerifyOption_G1UsePrevMarking); |
|
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|
1336 |
| 342 | 1337 } |
|
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|
1338 |
|
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|
1339 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
|
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|
1340 ref_processor_stw()->verify_no_references_recorded(); |
|
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|
1341 |
|
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|
1342 // Note: since we've just done a full GC, concurrent |
|
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|
1343 // marking is no longer active. Therefore we need not |
|
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|
1344 // re-enable reference discovery for the CM ref processor. |
|
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|
1345 // That will be done at the start of the next marking cycle. |
|
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|
1346 assert(!ref_processor_cm()->discovery_enabled(), "Postcondition"); |
|
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|
1347 ref_processor_cm()->verify_no_references_recorded(); |
| 342 | 1348 |
| 1349 reset_gc_time_stamp(); | |
| 1350 // Since everything potentially moved, we will clear all remembered | |
|
626
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1351 // sets, and clear all cards. Later we will rebuild remebered |
|
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|
1352 // sets. We will also reset the GC time stamps of the regions. |
| 342 | 1353 PostMCRemSetClearClosure rs_clear(mr_bs()); |
| 1354 heap_region_iterate(&rs_clear); | |
| 1355 | |
| 1356 // Resize the heap if necessary. | |
|
1656
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|
1357 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
| 342 | 1358 |
|
3778
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|
1359 if (_hr_printer.is_active()) { |
|
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|
1360 // We should do this after we potentially resize the heap so |
|
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|
1361 // that all the COMMIT / UNCOMMIT events are generated before |
|
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|
1362 // the end GC event. |
|
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|
1363 |
|
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|
1364 PostCompactionPrinterClosure cl(hr_printer()); |
|
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|
1365 heap_region_iterate(&cl); |
|
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|
1366 |
|
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|
1367 _hr_printer.end_gc(true /* full */, (size_t) total_collections()); |
|
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|
1368 } |
|
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|
1369 |
| 342 | 1370 if (_cg1r->use_cache()) { |
| 1371 _cg1r->clear_and_record_card_counts(); | |
| 1372 _cg1r->clear_hot_cache(); | |
| 1373 } | |
| 1374 | |
|
626
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|
1375 // Rebuild remembered sets of all regions. |
|
1833
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|
1376 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4095
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|
1377 int n_workers = |
|
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|
1378 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
|
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|
1379 workers()->active_workers(), |
|
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|
1380 Threads::number_of_non_daemon_threads()); |
|
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|
1381 assert(UseDynamicNumberOfGCThreads || |
|
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|
1382 n_workers == workers()->total_workers(), |
|
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|
1383 "If not dynamic should be using all the workers"); |
|
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|
1384 workers()->set_active_workers(n_workers); |
|
bca17e38de00
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|
1385 // Set parallel threads in the heap (_n_par_threads) only |
|
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|
1386 // before a parallel phase and always reset it to 0 after |
|
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|
1387 // the phase so that the number of parallel threads does |
|
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|
1388 // no get carried forward to a serial phase where there |
|
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|
1389 // may be code that is "possibly_parallel". |
|
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|
1390 set_par_threads(n_workers); |
|
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|
1391 |
|
626
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|
1392 ParRebuildRSTask rebuild_rs_task(this); |
|
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|
1393 assert(check_heap_region_claim_values( |
|
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|
1394 HeapRegion::InitialClaimValue), "sanity check"); |
|
4095
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|
1395 assert(UseDynamicNumberOfGCThreads || |
|
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|
1396 workers()->active_workers() == workers()->total_workers(), |
|
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|
1397 "Unless dynamic should use total workers"); |
|
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|
1398 // Use the most recent number of active workers |
|
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|
1399 assert(workers()->active_workers() > 0, |
|
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|
1400 "Active workers not properly set"); |
|
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|
1401 set_par_threads(workers()->active_workers()); |
|
626
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|
1402 workers()->run_task(&rebuild_rs_task); |
|
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|
1403 set_par_threads(0); |
|
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|
1404 assert(check_heap_region_claim_values( |
|
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|
1405 HeapRegion::RebuildRSClaimValue), "sanity check"); |
|
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|
1406 reset_heap_region_claim_values(); |
|
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|
1407 } else { |
|
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|
1408 RebuildRSOutOfRegionClosure rebuild_rs(this); |
|
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|
1409 heap_region_iterate(&rebuild_rs); |
|
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|
1410 } |
|
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|
1411 |
| 342 | 1412 if (PrintGC) { |
| 1413 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
| 1414 } | |
| 1415 | |
| 1416 if (true) { // FIXME | |
| 1417 // Ask the permanent generation to adjust size for full collections | |
| 1418 perm()->compute_new_size(); | |
| 1419 } | |
| 1420 | |
|
1394
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|
1421 // Start a new incremental collection set for the next pause |
|
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|
1422 assert(g1_policy()->collection_set() == NULL, "must be"); |
|
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|
1423 g1_policy()->start_incremental_cset_building(); |
|
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|
1424 |
|
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|
1425 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
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|
1426 // regions to the incremental collection set for the next |
|
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|
1427 // evacuation pause. |
|
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|
1428 clear_cset_fast_test(); |
|
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|
1429 |
|
2433
abdfc822206f
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diff
changeset
|
1430 init_mutator_alloc_region(); |
|
abdfc822206f
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diff
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|
1431 |
| 342 | 1432 double end = os::elapsedTime(); |
| 1433 g1_policy()->record_full_collection_end(); | |
| 1434 | |
|
546
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6690928: Use spinning in combination with yields for workstealing termination.
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|
1435 #ifdef TRACESPINNING |
|
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6690928: Use spinning in combination with yields for workstealing termination.
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diff
changeset
|
1436 ParallelTaskTerminator::print_termination_counts(); |
|
05c6d52fa7a9
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diff
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|
1437 #endif |
|
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|
1438 |
| 342 | 1439 gc_epilogue(true); |
| 1440 | |
| 794 | 1441 // Discard all rset updates |
| 1442 JavaThread::dirty_card_queue_set().abandon_logs(); | |
|
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
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changeset
|
1443 assert(!G1DeferredRSUpdate |
|
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|
1444 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
| 342 | 1445 } |
| 1446 | |
|
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1447 _young_list->reset_sampled_info(); |
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1448 // At this point there should be no regions in the |
|
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1449 // entire heap tagged as young. |
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1450 assert( check_young_list_empty(true /* check_heap */), |
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1451 "young list should be empty at this point"); |
|
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1452 |
|
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1453 // Update the number of full collections that have been completed. |
|
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1454 increment_full_collections_completed(false /* concurrent */); |
|
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1455 |
| 3766 | 1456 _hrs.verify_optional(); |
| 2152 | 1457 verify_region_sets_optional(); |
| 1458 | |
|
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1459 if (PrintHeapAtGC) { |
|
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1460 Universe::print_heap_after_gc(); |
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1461 } |
|
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1462 g1mm()->update_sizes(); |
|
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1463 post_full_gc_dump(); |
| 1973 | 1464 |
| 1465 return true; | |
| 342 | 1466 } |
| 1467 | |
| 1468 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
| 1973 | 1469 // do_collection() will return whether it succeeded in performing |
| 1470 // the GC. Currently, there is no facility on the | |
| 1471 // do_full_collection() API to notify the caller than the collection | |
| 1472 // did not succeed (e.g., because it was locked out by the GC | |
| 1473 // locker). So, right now, we'll ignore the return value. | |
| 1474 bool dummy = do_collection(true, /* explicit_gc */ | |
| 1475 clear_all_soft_refs, | |
| 1476 0 /* word_size */); | |
| 342 | 1477 } |
| 1478 | |
| 1479 // This code is mostly copied from TenuredGeneration. | |
| 1480 void | |
| 1481 G1CollectedHeap:: | |
| 1482 resize_if_necessary_after_full_collection(size_t word_size) { | |
| 1483 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
| 1484 | |
| 1485 // Include the current allocation, if any, and bytes that will be | |
| 1486 // pre-allocated to support collections, as "used". | |
| 1487 const size_t used_after_gc = used(); | |
| 1488 const size_t capacity_after_gc = capacity(); | |
| 1489 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
| 1490 | |
|
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1491 // This is enforced in arguments.cpp. |
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1492 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
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1493 "otherwise the code below doesn't make sense"); |
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1494 |
| 342 | 1495 // We don't have floating point command-line arguments |
|
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1496 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
| 342 | 1497 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
|
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1498 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
| 342 | 1499 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
| 1500 | |
|
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1501 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
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1502 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
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1503 |
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1504 // We have to be careful here as these two calculations can overflow |
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1505 // 32-bit size_t's. |
|
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1506 double used_after_gc_d = (double) used_after_gc; |
|
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1507 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
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1508 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
|
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1509 |
|
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1510 // Let's make sure that they are both under the max heap size, which |
|
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1511 // by default will make them fit into a size_t. |
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1512 double desired_capacity_upper_bound = (double) max_heap_size; |
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1513 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
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1514 desired_capacity_upper_bound); |
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1515 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
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1516 desired_capacity_upper_bound); |
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1517 |
|
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1518 // We can now safely turn them into size_t's. |
|
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1519 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
|
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1520 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
|
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1521 |
|
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1522 // This assert only makes sense here, before we adjust them |
|
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1523 // with respect to the min and max heap size. |
|
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1524 assert(minimum_desired_capacity <= maximum_desired_capacity, |
|
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1525 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
|
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1526 "maximum_desired_capacity = "SIZE_FORMAT, |
|
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1527 minimum_desired_capacity, maximum_desired_capacity)); |
|
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|
1528 |
|
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1529 // Should not be greater than the heap max size. No need to adjust |
|
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1530 // it with respect to the heap min size as it's a lower bound (i.e., |
|
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1531 // we'll try to make the capacity larger than it, not smaller). |
|
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|
1532 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
|
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|
1533 // Should not be less than the heap min size. No need to adjust it |
|
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1534 // with respect to the heap max size as it's an upper bound (i.e., |
|
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|
1535 // we'll try to make the capacity smaller than it, not greater). |
|
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|
1536 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
| 342 | 1537 |
|
1717
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|
1538 if (capacity_after_gc < minimum_desired_capacity) { |
| 342 | 1539 // Don't expand unless it's significant |
| 1540 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
|
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|
1541 ergo_verbose4(ErgoHeapSizing, |
|
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1542 "attempt heap expansion", |
|
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|
1543 ergo_format_reason("capacity lower than " |
|
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1544 "min desired capacity after Full GC") |
|
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|
1545 ergo_format_byte("capacity") |
|
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|
1546 ergo_format_byte("occupancy") |
|
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|
1547 ergo_format_byte_perc("min desired capacity"), |
|
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|
1548 capacity_after_gc, used_after_gc, |
|
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|
1549 minimum_desired_capacity, (double) MinHeapFreeRatio); |
|
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|
1550 expand(expand_bytes); |
| 342 | 1551 |
| 1552 // No expansion, now see if we want to shrink | |
|
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|
1553 } else if (capacity_after_gc > maximum_desired_capacity) { |
| 342 | 1554 // Capacity too large, compute shrinking size |
| 1555 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
|
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|
1556 ergo_verbose4(ErgoHeapSizing, |
|
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1557 "attempt heap shrinking", |
|
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|
1558 ergo_format_reason("capacity higher than " |
|
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|
1559 "max desired capacity after Full GC") |
|
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|
1560 ergo_format_byte("capacity") |
|
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|
1561 ergo_format_byte("occupancy") |
|
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|
1562 ergo_format_byte_perc("max desired capacity"), |
|
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|
1563 capacity_after_gc, used_after_gc, |
|
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|
1564 maximum_desired_capacity, (double) MaxHeapFreeRatio); |
| 342 | 1565 shrink(shrink_bytes); |
| 1566 } | |
| 1567 } | |
| 1568 | |
| 1569 | |
| 1570 HeapWord* | |
| 1973 | 1571 G1CollectedHeap::satisfy_failed_allocation(size_t word_size, |
| 1572 bool* succeeded) { | |
| 2152 | 1573 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1973 | 1574 |
| 1575 *succeeded = true; | |
| 1576 // Let's attempt the allocation first. | |
|
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|
1577 HeapWord* result = |
|
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|
1578 attempt_allocation_at_safepoint(word_size, |
|
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|
1579 false /* expect_null_mutator_alloc_region */); |
| 1973 | 1580 if (result != NULL) { |
| 1581 assert(*succeeded, "sanity"); | |
| 1582 return result; | |
| 1583 } | |
| 342 | 1584 |
| 1585 // In a G1 heap, we're supposed to keep allocation from failing by | |
| 1586 // incremental pauses. Therefore, at least for now, we'll favor | |
| 1587 // expansion over collection. (This might change in the future if we can | |
| 1588 // do something smarter than full collection to satisfy a failed alloc.) | |
| 1589 result = expand_and_allocate(word_size); | |
| 1590 if (result != NULL) { | |
| 1973 | 1591 assert(*succeeded, "sanity"); |
| 342 | 1592 return result; |
| 1593 } | |
| 1594 | |
| 1973 | 1595 // Expansion didn't work, we'll try to do a Full GC. |
| 1596 bool gc_succeeded = do_collection(false, /* explicit_gc */ | |
| 1597 false, /* clear_all_soft_refs */ | |
| 1598 word_size); | |
| 1599 if (!gc_succeeded) { | |
| 1600 *succeeded = false; | |
| 1601 return NULL; | |
| 1602 } | |
| 1603 | |
| 1604 // Retry the allocation | |
| 1605 result = attempt_allocation_at_safepoint(word_size, | |
|
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|
1606 true /* expect_null_mutator_alloc_region */); |
| 342 | 1607 if (result != NULL) { |
| 1973 | 1608 assert(*succeeded, "sanity"); |
| 342 | 1609 return result; |
| 1610 } | |
| 1611 | |
| 1973 | 1612 // Then, try a Full GC that will collect all soft references. |
| 1613 gc_succeeded = do_collection(false, /* explicit_gc */ | |
| 1614 true, /* clear_all_soft_refs */ | |
| 1615 word_size); | |
| 1616 if (!gc_succeeded) { | |
| 1617 *succeeded = false; | |
| 1618 return NULL; | |
| 1619 } | |
| 1620 | |
| 1621 // Retry the allocation once more | |
| 1622 result = attempt_allocation_at_safepoint(word_size, | |
|
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|
1623 true /* expect_null_mutator_alloc_region */); |
| 342 | 1624 if (result != NULL) { |
| 1973 | 1625 assert(*succeeded, "sanity"); |
| 342 | 1626 return result; |
| 1627 } | |
| 1628 | |
|
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|
1629 assert(!collector_policy()->should_clear_all_soft_refs(), |
| 1973 | 1630 "Flag should have been handled and cleared prior to this point"); |
|
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|
1631 |
| 342 | 1632 // What else? We might try synchronous finalization later. If the total |
| 1633 // space available is large enough for the allocation, then a more | |
| 1634 // complete compaction phase than we've tried so far might be | |
| 1635 // appropriate. | |
| 1973 | 1636 assert(*succeeded, "sanity"); |
| 342 | 1637 return NULL; |
| 1638 } | |
| 1639 | |
| 1640 // Attempting to expand the heap sufficiently | |
| 1641 // to support an allocation of the given "word_size". If | |
| 1642 // successful, perform the allocation and return the address of the | |
| 1643 // allocated block, or else "NULL". | |
| 1644 | |
| 1645 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
| 2152 | 1646 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1647 | |
| 1648 verify_region_sets_optional(); | |
| 1973 | 1649 |
|
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1650 size_t expand_bytes = MAX2(word_size * HeapWordSize, MinHeapDeltaBytes); |
|
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1651 ergo_verbose1(ErgoHeapSizing, |
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1652 "attempt heap expansion", |
|
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1653 ergo_format_reason("allocation request failed") |
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1654 ergo_format_byte("allocation request"), |
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1655 word_size * HeapWordSize); |
|
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1656 if (expand(expand_bytes)) { |
| 3766 | 1657 _hrs.verify_optional(); |
|
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1658 verify_region_sets_optional(); |
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1659 return attempt_allocation_at_safepoint(word_size, |
|
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1660 false /* expect_null_mutator_alloc_region */); |
|
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1661 } |
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1662 return NULL; |
| 342 | 1663 } |
| 1664 | |
| 3766 | 1665 void G1CollectedHeap::update_committed_space(HeapWord* old_end, |
| 1666 HeapWord* new_end) { | |
| 1667 assert(old_end != new_end, "don't call this otherwise"); | |
| 1668 assert((HeapWord*) _g1_storage.high() == new_end, "invariant"); | |
| 1669 | |
| 1670 // Update the committed mem region. | |
| 1671 _g1_committed.set_end(new_end); | |
| 1672 // Tell the card table about the update. | |
| 1673 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
| 1674 // Tell the BOT about the update. | |
| 1675 _bot_shared->resize(_g1_committed.word_size()); | |
| 1676 } | |
| 1677 | |
|
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1678 bool G1CollectedHeap::expand(size_t expand_bytes) { |
| 342 | 1679 size_t old_mem_size = _g1_storage.committed_size(); |
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1680 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
| 342 | 1681 aligned_expand_bytes = align_size_up(aligned_expand_bytes, |
| 1682 HeapRegion::GrainBytes); | |
|
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1683 ergo_verbose2(ErgoHeapSizing, |
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1684 "expand the heap", |
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1685 ergo_format_byte("requested expansion amount") |
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1686 ergo_format_byte("attempted expansion amount"), |
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1687 expand_bytes, aligned_expand_bytes); |
|
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1688 |
| 3766 | 1689 // First commit the memory. |
| 1690 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
|
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1691 bool successful = _g1_storage.expand_by(aligned_expand_bytes); |
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1692 if (successful) { |
| 3766 | 1693 // Then propagate this update to the necessary data structures. |
| 1694 HeapWord* new_end = (HeapWord*) _g1_storage.high(); | |
| 1695 update_committed_space(old_end, new_end); | |
| 1696 | |
| 1697 FreeRegionList expansion_list("Local Expansion List"); | |
| 1698 MemRegion mr = _hrs.expand_by(old_end, new_end, &expansion_list); | |
| 1699 assert(mr.start() == old_end, "post-condition"); | |
| 1700 // mr might be a smaller region than what was requested if | |
| 1701 // expand_by() was unable to allocate the HeapRegion instances | |
| 1702 assert(mr.end() <= new_end, "post-condition"); | |
| 1703 | |
| 1704 size_t actual_expand_bytes = mr.byte_size(); | |
| 1705 assert(actual_expand_bytes <= aligned_expand_bytes, "post-condition"); | |
| 1706 assert(actual_expand_bytes == expansion_list.total_capacity_bytes(), | |
| 1707 "post-condition"); | |
| 1708 if (actual_expand_bytes < aligned_expand_bytes) { | |
| 1709 // We could not expand _hrs to the desired size. In this case we | |
| 1710 // need to shrink the committed space accordingly. | |
| 1711 assert(mr.end() < new_end, "invariant"); | |
| 1712 | |
| 1713 size_t diff_bytes = aligned_expand_bytes - actual_expand_bytes; | |
| 1714 // First uncommit the memory. | |
| 1715 _g1_storage.shrink_by(diff_bytes); | |
| 1716 // Then propagate this update to the necessary data structures. | |
| 1717 update_committed_space(new_end, mr.end()); | |
|
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1718 } |
| 3766 | 1719 _free_list.add_as_tail(&expansion_list); |
|
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1720 |
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1721 if (_hr_printer.is_active()) { |
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1722 HeapWord* curr = mr.start(); |
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1723 while (curr < mr.end()) { |
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1724 HeapWord* curr_end = curr + HeapRegion::GrainWords; |
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1725 _hr_printer.commit(curr, curr_end); |
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1726 curr = curr_end; |
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1727 } |
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1728 assert(curr == mr.end(), "post-condition"); |
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1729 } |
|
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1730 g1_policy()->record_new_heap_size(n_regions()); |
|
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1731 } else { |
|
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1732 ergo_verbose0(ErgoHeapSizing, |
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1733 "did not expand the heap", |
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1734 ergo_format_reason("heap expansion operation failed")); |
|
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1735 // The expansion of the virtual storage space was unsuccessful. |
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1736 // Let's see if it was because we ran out of swap. |
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1737 if (G1ExitOnExpansionFailure && |
|
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1738 _g1_storage.uncommitted_size() >= aligned_expand_bytes) { |
|
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1739 // We had head room... |
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1740 vm_exit_out_of_memory(aligned_expand_bytes, "G1 heap expansion"); |
| 342 | 1741 } |
| 1742 } | |
|
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1743 return successful; |
| 342 | 1744 } |
| 1745 | |
| 3766 | 1746 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) { |
| 342 | 1747 size_t old_mem_size = _g1_storage.committed_size(); |
| 1748 size_t aligned_shrink_bytes = | |
| 1749 ReservedSpace::page_align_size_down(shrink_bytes); | |
| 1750 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
| 1751 HeapRegion::GrainBytes); | |
| 1752 size_t num_regions_deleted = 0; | |
| 3766 | 1753 MemRegion mr = _hrs.shrink_by(aligned_shrink_bytes, &num_regions_deleted); |
| 1754 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
| 1755 assert(mr.end() == old_end, "post-condition"); | |
|
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1756 |
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1757 ergo_verbose3(ErgoHeapSizing, |
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1758 "shrink the heap", |
|
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1759 ergo_format_byte("requested shrinking amount") |
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1760 ergo_format_byte("aligned shrinking amount") |
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1761 ergo_format_byte("attempted shrinking amount"), |
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1762 shrink_bytes, aligned_shrink_bytes, mr.byte_size()); |
| 3766 | 1763 if (mr.byte_size() > 0) { |
|
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1764 if (_hr_printer.is_active()) { |
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1765 HeapWord* curr = mr.end(); |
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1766 while (curr > mr.start()) { |
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1767 HeapWord* curr_end = curr; |
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1768 curr -= HeapRegion::GrainWords; |
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1769 _hr_printer.uncommit(curr, curr_end); |
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1770 } |
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1771 assert(curr == mr.start(), "post-condition"); |
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1772 } |
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1773 |
| 342 | 1774 _g1_storage.shrink_by(mr.byte_size()); |
| 3766 | 1775 HeapWord* new_end = (HeapWord*) _g1_storage.high(); |
| 1776 assert(mr.start() == new_end, "post-condition"); | |
| 1777 | |
| 1778 _expansion_regions += num_regions_deleted; | |
| 1779 update_committed_space(old_end, new_end); | |
| 1780 HeapRegionRemSet::shrink_heap(n_regions()); | |
|
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1781 g1_policy()->record_new_heap_size(n_regions()); |
|
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1782 } else { |
|
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1783 ergo_verbose0(ErgoHeapSizing, |
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1784 "did not shrink the heap", |
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1785 ergo_format_reason("heap shrinking operation failed")); |
| 342 | 1786 } |
| 1787 } | |
| 1788 | |
| 1789 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
| 2152 | 1790 verify_region_sets_optional(); |
| 1791 | |
|
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1792 // We should only reach here at the end of a Full GC which means we |
|
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1793 // should not not be holding to any GC alloc regions. The method |
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1794 // below will make sure of that and do any remaining clean up. |
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1795 abandon_gc_alloc_regions(); |
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1796 |
| 2152 | 1797 // Instead of tearing down / rebuilding the free lists here, we |
| 1798 // could instead use the remove_all_pending() method on free_list to | |
| 1799 // remove only the ones that we need to remove. | |
| 4072 | 1800 tear_down_region_sets(true /* free_list_only */); |
| 342 | 1801 shrink_helper(shrink_bytes); |
| 4072 | 1802 rebuild_region_sets(true /* free_list_only */); |
| 2152 | 1803 |
| 3766 | 1804 _hrs.verify_optional(); |
| 2152 | 1805 verify_region_sets_optional(); |
| 342 | 1806 } |
| 1807 | |
| 1808 // Public methods. | |
| 1809 | |
| 1810 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 1811 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 1812 #endif // _MSC_VER | |
| 1813 | |
| 1814 | |
| 1815 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
| 1816 SharedHeap(policy_), | |
| 1817 _g1_policy(policy_), | |
| 1111 | 1818 _dirty_card_queue_set(false), |
| 1705 | 1819 _into_cset_dirty_card_queue_set(false), |
|
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1820 _is_alive_closure_cm(this), |
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1821 _is_alive_closure_stw(this), |
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1822 _ref_processor_cm(NULL), |
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1823 _ref_processor_stw(NULL), |
| 342 | 1824 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), |
| 1825 _bot_shared(NULL), | |
| 1826 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
| 1827 _evac_failure_scan_stack(NULL) , | |
| 1828 _mark_in_progress(false), | |
| 2152 | 1829 _cg1r(NULL), _summary_bytes_used(0), |
|
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1830 _g1mm(NULL), |
| 342 | 1831 _refine_cte_cl(NULL), |
| 1832 _full_collection(false), | |
| 2152 | 1833 _free_list("Master Free List"), |
| 1834 _secondary_free_list("Secondary Free List"), | |
| 4072 | 1835 _old_set("Old Set"), |
| 2152 | 1836 _humongous_set("Master Humongous Set"), |
| 1837 _free_regions_coming(false), | |
| 342 | 1838 _young_list(new YoungList(this)), |
| 1839 _gc_time_stamp(0), | |
|
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1840 _retained_old_gc_alloc_region(NULL), |
| 526 | 1841 _surviving_young_words(NULL), |
|
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1842 _full_collections_completed(0), |
| 526 | 1843 _in_cset_fast_test(NULL), |
|
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1844 _in_cset_fast_test_base(NULL), |
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1845 _dirty_cards_region_list(NULL) { |
| 342 | 1846 _g1h = this; // To catch bugs. |
| 1847 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
| 1848 vm_exit_during_initialization("Failed necessary allocation."); | |
| 1849 } | |
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1850 |
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1851 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1852 |
| 342 | 1853 int n_queues = MAX2((int)ParallelGCThreads, 1); |
| 1854 _task_queues = new RefToScanQueueSet(n_queues); | |
| 1855 | |
| 1856 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
| 1857 assert(n_rem_sets > 0, "Invariant."); | |
| 1858 | |
| 1859 HeapRegionRemSetIterator** iter_arr = | |
| 1860 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
| 1861 for (int i = 0; i < n_queues; i++) { | |
| 1862 iter_arr[i] = new HeapRegionRemSetIterator(); | |
| 1863 } | |
| 1864 _rem_set_iterator = iter_arr; | |
| 1865 | |
| 1866 for (int i = 0; i < n_queues; i++) { | |
| 1867 RefToScanQueue* q = new RefToScanQueue(); | |
| 1868 q->initialize(); | |
| 1869 _task_queues->register_queue(i, q); | |
| 1870 } | |
| 1871 | |
| 1872 guarantee(_task_queues != NULL, "task_queues allocation failure."); | |
| 1873 } | |
| 1874 | |
| 1875 jint G1CollectedHeap::initialize() { | |
| 1166 | 1876 CollectedHeap::pre_initialize(); |
| 342 | 1877 os::enable_vtime(); |
| 1878 | |
| 1879 // Necessary to satisfy locking discipline assertions. | |
| 1880 | |
| 1881 MutexLocker x(Heap_lock); | |
| 1882 | |
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1883 // We have to initialize the printer before committing the heap, as |
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1884 // it will be used then. |
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1885 _hr_printer.set_active(G1PrintHeapRegions); |
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1886 |
| 342 | 1887 // While there are no constraints in the GC code that HeapWordSize |
| 1888 // be any particular value, there are multiple other areas in the | |
| 1889 // system which believe this to be true (e.g. oop->object_size in some | |
| 1890 // cases incorrectly returns the size in wordSize units rather than | |
| 1891 // HeapWordSize). | |
| 1892 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
| 1893 | |
| 1894 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
| 1895 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
| 1896 | |
| 1897 // Ensure that the sizes are properly aligned. | |
| 1898 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1899 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1900 | |
| 1901 _cg1r = new ConcurrentG1Refine(); | |
| 1902 | |
| 1903 // Reserve the maximum. | |
| 1904 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
| 1905 // Includes the perm-gen. | |
|
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1906 |
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1907 // When compressed oops are enabled, the preferred heap base |
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1908 // is calculated by subtracting the requested size from the |
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1909 // 32Gb boundary and using the result as the base address for |
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1910 // heap reservation. If the requested size is not aligned to |
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1911 // HeapRegion::GrainBytes (i.e. the alignment that is passed |
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1912 // into the ReservedHeapSpace constructor) then the actual |
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1913 // base of the reserved heap may end up differing from the |
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1914 // address that was requested (i.e. the preferred heap base). |
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1915 // If this happens then we could end up using a non-optimal |
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1916 // compressed oops mode. |
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1917 |
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1918 // Since max_byte_size is aligned to the size of a heap region (checked |
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1919 // above), we also need to align the perm gen size as it might not be. |
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1920 const size_t total_reserved = max_byte_size + |
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1921 align_size_up(pgs->max_size(), HeapRegion::GrainBytes); |
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1922 Universe::check_alignment(total_reserved, HeapRegion::GrainBytes, "g1 heap and perm"); |
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1923 |
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1924 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1925 |
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1926 ReservedHeapSpace heap_rs(total_reserved, HeapRegion::GrainBytes, |
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1927 UseLargePages, addr); |
|
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1928 |
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1929 if (UseCompressedOops) { |
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1930 if (addr != NULL && !heap_rs.is_reserved()) { |
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1931 // Failed to reserve at specified address - the requested memory |
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1932 // region is taken already, for example, by 'java' launcher. |
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1933 // Try again to reserver heap higher. |
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1934 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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1935 |
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1936 ReservedHeapSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1937 UseLargePages, addr); |
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1938 |
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1939 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1940 // Failed to reserve at specified address again - give up. |
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1941 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1942 assert(addr == NULL, ""); |
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1943 |
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1944 ReservedHeapSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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1945 UseLargePages, addr); |
|
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1946 heap_rs = heap_rs1; |
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1947 } else { |
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1948 heap_rs = heap_rs0; |
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1949 } |
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1950 } |
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1951 } |
| 342 | 1952 |
| 1953 if (!heap_rs.is_reserved()) { | |
| 1954 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
| 1955 return JNI_ENOMEM; | |
| 1956 } | |
| 1957 | |
| 1958 // It is important to do this in a way such that concurrent readers can't | |
| 1959 // temporarily think somethings in the heap. (I've actually seen this | |
| 1960 // happen in asserts: DLD.) | |
| 1961 _reserved.set_word_size(0); | |
| 1962 _reserved.set_start((HeapWord*)heap_rs.base()); | |
| 1963 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 1964 | |
| 1965 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
| 1966 | |
| 1967 // Create the gen rem set (and barrier set) for the entire reserved region. | |
| 1968 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
| 1969 set_barrier_set(rem_set()->bs()); | |
| 1970 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
| 1971 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
| 1972 } else { | |
| 1973 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
| 1974 return JNI_ENOMEM; | |
| 1975 } | |
| 1976 | |
| 1977 // Also create a G1 rem set. | |
| 1861 | 1978 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { |
| 1979 _g1_rem_set = new G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
| 342 | 1980 } else { |
| 1861 | 1981 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); |
| 1982 return JNI_ENOMEM; | |
| 342 | 1983 } |
| 1984 | |
| 1985 // Carve out the G1 part of the heap. | |
| 1986 | |
| 1987 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
| 1988 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
| 1989 g1_rs.size()/HeapWordSize); | |
| 1990 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
| 1991 | |
| 1992 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
| 1993 | |
| 1994 _g1_storage.initialize(g1_rs, 0); | |
| 1995 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
| 3766 | 1996 _hrs.initialize((HeapWord*) _g1_reserved.start(), |
| 1997 (HeapWord*) _g1_reserved.end(), | |
| 1998 _expansion_regions); | |
| 342 | 1999 |
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2000 // 6843694 - ensure that the maximum region index can fit |
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2001 // in the remembered set structures. |
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2002 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
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2003 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
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2004 |
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2005 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
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2006 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
|
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2007 guarantee(HeapRegion::CardsPerRegion < max_cards_per_region, |
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2008 "too many cards per region"); |
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2009 |
| 2152 | 2010 HeapRegionSet::set_unrealistically_long_length(max_regions() + 1); |
| 2011 | |
| 342 | 2012 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
| 2013 heap_word_size(init_byte_size)); | |
| 2014 | |
| 2015 _g1h = this; | |
| 2016 | |
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2017 _in_cset_fast_test_length = max_regions(); |
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2018 _in_cset_fast_test_base = NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); |
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2019 |
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2020 // We're biasing _in_cset_fast_test to avoid subtracting the |
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2021 // beginning of the heap every time we want to index; basically |
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2022 // it's the same with what we do with the card table. |
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2023 _in_cset_fast_test = _in_cset_fast_test_base - |
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2024 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
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2025 |
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2026 // Clear the _cset_fast_test bitmap in anticipation of adding |
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2027 // regions to the incremental collection set for the first |
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2028 // evacuation pause. |
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2029 clear_cset_fast_test(); |
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2030 |
| 342 | 2031 // Create the ConcurrentMark data structure and thread. |
| 2032 // (Must do this late, so that "max_regions" is defined.) | |
| 2033 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
| 2034 _cmThread = _cm->cmThread(); | |
| 2035 | |
| 2036 // Initialize the from_card cache structure of HeapRegionRemSet. | |
| 2037 HeapRegionRemSet::init_heap(max_regions()); | |
| 2038 | |
| 677 | 2039 // Now expand into the initial heap size. |
|
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2040 if (!expand(init_byte_size)) { |
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2041 vm_exit_during_initialization("Failed to allocate initial heap."); |
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2042 return JNI_ENOMEM; |
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2043 } |
| 342 | 2044 |
| 2045 // Perform any initialization actions delegated to the policy. | |
| 2046 g1_policy()->init(); | |
| 2047 | |
| 2048 _refine_cte_cl = | |
| 2049 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
| 2050 g1_rem_set(), | |
| 2051 concurrent_g1_refine()); | |
| 2052 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 2053 | |
| 2054 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
| 2055 SATB_Q_FL_lock, | |
| 1111 | 2056 G1SATBProcessCompletedThreshold, |
| 342 | 2057 Shared_SATB_Q_lock); |
| 794 | 2058 |
| 2059 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
| 2060 DirtyCardQ_FL_lock, | |
| 1111 | 2061 concurrent_g1_refine()->yellow_zone(), |
| 2062 concurrent_g1_refine()->red_zone(), | |
| 794 | 2063 Shared_DirtyCardQ_lock); |
| 2064 | |
|
616
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2065 if (G1DeferredRSUpdate) { |
|
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|
2066 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
|
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|
2067 DirtyCardQ_FL_lock, |
| 1111 | 2068 -1, // never trigger processing |
| 2069 -1, // no limit on length | |
|
616
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|
2070 Shared_DirtyCardQ_lock, |
|
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|
2071 &JavaThread::dirty_card_queue_set()); |
|
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|
2072 } |
| 1705 | 2073 |
| 2074 // Initialize the card queue set used to hold cards containing | |
| 2075 // references into the collection set. | |
| 2076 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
| 2077 DirtyCardQ_FL_lock, | |
| 2078 -1, // never trigger processing | |
| 2079 -1, // no limit on length | |
| 2080 Shared_DirtyCardQ_lock, | |
| 2081 &JavaThread::dirty_card_queue_set()); | |
| 2082 | |
| 342 | 2083 // In case we're keeping closure specialization stats, initialize those |
| 2084 // counts and that mechanism. | |
| 2085 SpecializationStats::clear(); | |
| 2086 | |
| 2087 // Do later initialization work for concurrent refinement. | |
| 2088 _cg1r->init(); | |
| 2089 | |
|
2433
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|
2090 // Here we allocate the dummy full region that is required by the |
|
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2091 // G1AllocRegion class. If we don't pass an address in the reserved |
|
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|
2092 // space here, lots of asserts fire. |
| 3766 | 2093 |
| 2094 HeapRegion* dummy_region = new_heap_region(0 /* index of bottom region */, | |
| 2095 _g1_reserved.start()); | |
|
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2096 // We'll re-use the same region whether the alloc region will |
|
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2097 // require BOT updates or not and, if it doesn't, then a non-young |
|
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2098 // region will complain that it cannot support allocations without |
|
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2099 // BOT updates. So we'll tag the dummy region as young to avoid that. |
|
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|
2100 dummy_region->set_young(); |
|
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|
2101 // Make sure it's full. |
|
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|
2102 dummy_region->set_top(dummy_region->end()); |
|
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2103 G1AllocRegion::setup(this, dummy_region); |
|
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2104 |
|
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|
2105 init_mutator_alloc_region(); |
|
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|
2106 |
|
3289
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|
2107 // Do create of the monitoring and management support so that |
|
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|
2108 // values in the heap have been properly initialized. |
|
3980
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|
2109 _g1mm = new G1MonitoringSupport(this); |
|
3289
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|
2110 |
| 342 | 2111 return JNI_OK; |
| 2112 } | |
| 2113 | |
| 2114 void G1CollectedHeap::ref_processing_init() { | |
|
1974
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|
2115 // Reference processing in G1 currently works as follows: |
|
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2116 // |
|
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2117 // * There are two reference processor instances. One is |
|
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|
2118 // used to record and process discovered references |
|
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|
2119 // during concurrent marking; the other is used to |
|
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|
2120 // record and process references during STW pauses |
|
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|
2121 // (both full and incremental). |
|
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|
2122 // * Both ref processors need to 'span' the entire heap as |
|
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|
2123 // the regions in the collection set may be dotted around. |
|
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|
2124 // |
|
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|
2125 // * For the concurrent marking ref processor: |
|
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|
2126 // * Reference discovery is enabled at initial marking. |
|
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|
2127 // * Reference discovery is disabled and the discovered |
|
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|
2128 // references processed etc during remarking. |
|
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|
2129 // * Reference discovery is MT (see below). |
|
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|
2130 // * Reference discovery requires a barrier (see below). |
|
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|
2131 // * Reference processing may or may not be MT |
|
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|
2132 // (depending on the value of ParallelRefProcEnabled |
|
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|
2133 // and ParallelGCThreads). |
|
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|
2134 // * A full GC disables reference discovery by the CM |
|
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|
2135 // ref processor and abandons any entries on it's |
|
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|
2136 // discovered lists. |
|
4dfb2df418f2
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|
2137 // |
|
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|
2138 // * For the STW processor: |
|
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|
2139 // * Non MT discovery is enabled at the start of a full GC. |
|
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|
2140 // * Processing and enqueueing during a full GC is non-MT. |
|
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|
2141 // * During a full GC, references are processed after marking. |
|
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|
2142 // |
|
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changeset
|
2143 // * Discovery (may or may not be MT) is enabled at the start |
|
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|
2144 // of an incremental evacuation pause. |
|
4dfb2df418f2
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changeset
|
2145 // * References are processed near the end of a STW evacuation pause. |
|
4dfb2df418f2
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3973
diff
changeset
|
2146 // * For both types of GC: |
|
4dfb2df418f2
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changeset
|
2147 // * Discovery is atomic - i.e. not concurrent. |
|
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parents:
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changeset
|
2148 // * Reference discovery will not need a barrier. |
|
1974
fd1d227ef1b9
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diff
changeset
|
2149 |
| 342 | 2150 SharedHeap::ref_processing_init(); |
| 2151 MemRegion mr = reserved_region(); | |
|
3979
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|
2152 |
|
4dfb2df418f2
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changeset
|
2153 // Concurrent Mark ref processor |
|
4dfb2df418f2
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diff
changeset
|
2154 _ref_processor_cm = |
|
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
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2361
diff
changeset
|
2155 new ReferenceProcessor(mr, // span |
|
3979
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diff
changeset
|
2156 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
|
4dfb2df418f2
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parents:
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diff
changeset
|
2157 // mt processing |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
2158 (int) ParallelGCThreads, |
|
4dfb2df418f2
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johnc
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3973
diff
changeset
|
2159 // degree of mt processing |
|
4dfb2df418f2
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diff
changeset
|
2160 (ParallelGCThreads > 1) || (ConcGCThreads > 1), |
|
4dfb2df418f2
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diff
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|
2161 // mt discovery |
|
4dfb2df418f2
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diff
changeset
|
2162 (int) MAX2(ParallelGCThreads, ConcGCThreads), |
|
4dfb2df418f2
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johnc
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3973
diff
changeset
|
2163 // degree of mt discovery |
|
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2164 false, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2165 // Reference discovery is not atomic |
|
4dfb2df418f2
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johnc
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diff
changeset
|
2166 &_is_alive_closure_cm, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
2167 // is alive closure |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
2168 // (for efficiency/performance) |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
2169 true); |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
2170 // Setting next fields of discovered |
|
4dfb2df418f2
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johnc
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3973
diff
changeset
|
2171 // lists requires a barrier. |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
2172 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
2173 // STW ref processor |
|
4dfb2df418f2
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johnc
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3973
diff
changeset
|
2174 _ref_processor_stw = |
|
4dfb2df418f2
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johnc
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3973
diff
changeset
|
2175 new ReferenceProcessor(mr, // span |
|
4dfb2df418f2
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3973
diff
changeset
|
2176 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
|
4dfb2df418f2
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diff
changeset
|
2177 // mt processing |
|
4dfb2df418f2
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parents:
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diff
changeset
|
2178 MAX2((int)ParallelGCThreads, 1), |
|
4dfb2df418f2
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diff
changeset
|
2179 // degree of mt processing |
|
4dfb2df418f2
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3973
diff
changeset
|
2180 (ParallelGCThreads > 1), |
|
4dfb2df418f2
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diff
changeset
|
2181 // mt discovery |
|
4dfb2df418f2
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diff
changeset
|
2182 MAX2((int)ParallelGCThreads, 1), |
|
4dfb2df418f2
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3973
diff
changeset
|
2183 // degree of mt discovery |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2184 true, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
2185 // Reference discovery is atomic |
|
4dfb2df418f2
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3973
diff
changeset
|
2186 &_is_alive_closure_stw, |
|
4dfb2df418f2
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diff
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|
2187 // is alive closure |
|
4dfb2df418f2
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3973
diff
changeset
|
2188 // (for efficiency/performance) |
|
4dfb2df418f2
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diff
changeset
|
2189 false); |
|
4dfb2df418f2
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diff
changeset
|
2190 // Setting next fields of discovered |
|
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|
2191 // lists requires a barrier. |
| 342 | 2192 } |
| 2193 | |
| 2194 size_t G1CollectedHeap::capacity() const { | |
| 2195 return _g1_committed.byte_size(); | |
| 2196 } | |
| 2197 | |
| 1705 | 2198 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
| 2199 DirtyCardQueue* into_cset_dcq, | |
| 2200 bool concurrent, | |
| 342 | 2201 int worker_i) { |
| 889 | 2202 // Clean cards in the hot card cache |
| 1705 | 2203 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set(), into_cset_dcq); |
| 889 | 2204 |
| 342 | 2205 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
| 2206 int n_completed_buffers = 0; | |
| 1705 | 2207 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
| 342 | 2208 n_completed_buffers++; |
| 2209 } | |
| 2210 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
| 2211 (double) n_completed_buffers); | |
| 2212 dcqs.clear_n_completed_buffers(); | |
| 2213 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
| 2214 } | |
| 2215 | |
| 2216 | |
| 2217 // Computes the sum of the storage used by the various regions. | |
| 2218 | |
| 2219 size_t G1CollectedHeap::used() const { | |
|
862
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861
diff
changeset
|
2220 assert(Heap_lock->owner() != NULL, |
|
36b5611220a7
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861
diff
changeset
|
2221 "Should be owned on this thread's behalf."); |
| 342 | 2222 size_t result = _summary_bytes_used; |
|
845
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838
diff
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|
2223 // Read only once in case it is set to NULL concurrently |
|
2433
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|
2224 HeapRegion* hr = _mutator_alloc_region.get(); |
|
845
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|
2225 if (hr != NULL) |
|
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|
2226 result += hr->used(); |
| 342 | 2227 return result; |
| 2228 } | |
| 2229 | |
|
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
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845
diff
changeset
|
2230 size_t G1CollectedHeap::used_unlocked() const { |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2231 size_t result = _summary_bytes_used; |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2232 return result; |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
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845
diff
changeset
|
2233 } |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2234 |
| 342 | 2235 class SumUsedClosure: public HeapRegionClosure { |
| 2236 size_t _used; | |
| 2237 public: | |
| 2238 SumUsedClosure() : _used(0) {} | |
| 2239 bool doHeapRegion(HeapRegion* r) { | |
| 2240 if (!r->continuesHumongous()) { | |
| 2241 _used += r->used(); | |
| 2242 } | |
| 2243 return false; | |
| 2244 } | |
| 2245 size_t result() { return _used; } | |
| 2246 }; | |
| 2247 | |
| 2248 size_t G1CollectedHeap::recalculate_used() const { | |
| 2249 SumUsedClosure blk; | |
| 3766 | 2250 heap_region_iterate(&blk); |
| 342 | 2251 return blk.result(); |
| 2252 } | |
| 2253 | |
| 2254 size_t G1CollectedHeap::unsafe_max_alloc() { | |
| 2152 | 2255 if (free_regions() > 0) return HeapRegion::GrainBytes; |
| 342 | 2256 // otherwise, is there space in the current allocation region? |
| 2257 | |
| 2258 // We need to store the current allocation region in a local variable | |
| 2259 // here. The problem is that this method doesn't take any locks and | |
| 2260 // there may be other threads which overwrite the current allocation | |
| 2261 // region field. attempt_allocation(), for example, sets it to NULL | |
| 2262 // and this can happen *after* the NULL check here but before the call | |
| 2263 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
| 2264 // to be a problem in the optimized build, since the two loads of the | |
| 2265 // current allocation region field are optimized away. | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2266 HeapRegion* hr = _mutator_alloc_region.get(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2267 if (hr == NULL) { |
| 342 | 2268 return 0; |
| 2269 } | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2270 return hr->free(); |
| 342 | 2271 } |
| 2272 | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2273 bool G1CollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2274 return |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2275 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2276 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2277 } |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2278 |
|
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2279 #ifndef PRODUCT |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2280 void G1CollectedHeap::allocate_dummy_regions() { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2281 // Let's fill up most of the region |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2282 size_t word_size = HeapRegion::GrainWords - 1024; |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2283 // And as a result the region we'll allocate will be humongous. |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2284 guarantee(isHumongous(word_size), "sanity"); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2285 |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2286 for (uintx i = 0; i < G1DummyRegionsPerGC; ++i) { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2287 // Let's use the existing mechanism for the allocation |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2288 HeapWord* dummy_obj = humongous_obj_allocate(word_size); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2289 if (dummy_obj != NULL) { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2290 MemRegion mr(dummy_obj, word_size); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2291 CollectedHeap::fill_with_object(mr); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2292 } else { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2293 // If we can't allocate once, we probably cannot allocate |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2294 // again. Let's get out of the loop. |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2295 break; |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2296 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2297 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2298 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2299 #endif // !PRODUCT |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2300 |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2301 void G1CollectedHeap::increment_full_collections_completed(bool concurrent) { |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2302 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2303 |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2304 // We assume that if concurrent == true, then the caller is a |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2305 // concurrent thread that was joined the Suspendible Thread |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2306 // Set. If there's ever a cheap way to check this, we should add an |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2307 // assert here. |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2308 |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2309 // We have already incremented _total_full_collections at the start |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2310 // of the GC, so total_full_collections() represents how many full |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2311 // collections have been started. |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2312 unsigned int full_collections_started = total_full_collections(); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2313 |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2314 // Given that this method is called at the end of a Full GC or of a |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2315 // concurrent cycle, and those can be nested (i.e., a Full GC can |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2316 // interrupt a concurrent cycle), the number of full collections |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2317 // completed should be either one (in the case where there was no |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2318 // nesting) or two (when a Full GC interrupted a concurrent cycle) |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2319 // behind the number of full collections started. |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2320 |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2321 // This is the case for the inner caller, i.e. a Full GC. |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2322 assert(concurrent || |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2323 (full_collections_started == _full_collections_completed + 1) || |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2324 (full_collections_started == _full_collections_completed + 2), |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2325 err_msg("for inner caller (Full GC): full_collections_started = %u " |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2326 "is inconsistent with _full_collections_completed = %u", |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2327 full_collections_started, _full_collections_completed)); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2328 |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2329 // This is the case for the outer caller, i.e. the concurrent cycle. |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2330 assert(!concurrent || |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2331 (full_collections_started == _full_collections_completed + 1), |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2332 err_msg("for outer caller (concurrent cycle): " |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2333 "full_collections_started = %u " |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2334 "is inconsistent with _full_collections_completed = %u", |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2335 full_collections_started, _full_collections_completed)); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2336 |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2337 _full_collections_completed += 1; |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2338 |
|
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2339 // We need to clear the "in_progress" flag in the CM thread before |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2340 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2341 // is set) so that if a waiter requests another System.gc() it doesn't |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2342 // incorrectly see that a marking cyle is still in progress. |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2343 if (concurrent) { |
|
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2344 _cmThread->clear_in_progress(); |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2345 } |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2346 |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2347 // This notify_all() will ensure that a thread that called |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2348 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2349 // and it's waiting for a full GC to finish will be woken up. It is |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2350 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2351 FullGCCount_lock->notify_all(); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2352 } |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
changeset
|
2353 |
| 342 | 2354 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
| 2152 | 2355 assert_at_safepoint(true /* should_be_vm_thread */); |
| 342 | 2356 GCCauseSetter gcs(this, cause); |
| 2357 switch (cause) { | |
| 2358 case GCCause::_heap_inspection: | |
| 2359 case GCCause::_heap_dump: { | |
| 2360 HandleMark hm; | |
| 2361 do_full_collection(false); // don't clear all soft refs | |
| 2362 break; | |
| 2363 } | |
| 2364 default: // XXX FIX ME | |
| 2365 ShouldNotReachHere(); // Unexpected use of this function | |
| 2366 } | |
| 2367 } | |
| 2368 | |
|
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2369 void G1CollectedHeap::collect(GCCause::Cause cause) { |
|
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2370 // The caller doesn't have the Heap_lock |
|
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2371 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
|
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2372 |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
changeset
|
2373 unsigned int gc_count_before; |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2374 unsigned int full_gc_count_before; |
| 342 | 2375 { |
|
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2376 MutexLocker ml(Heap_lock); |
| 1973 | 2377 |
|
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2378 // Read the GC count while holding the Heap_lock |
|
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2379 gc_count_before = SharedHeap::heap()->total_collections(); |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2380 full_gc_count_before = SharedHeap::heap()->total_full_collections(); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2381 } |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2382 |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2383 if (should_do_concurrent_full_gc(cause)) { |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2384 // Schedule an initial-mark evacuation pause that will start a |
| 1973 | 2385 // concurrent cycle. We're setting word_size to 0 which means that |
| 2386 // we are not requesting a post-GC allocation. | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
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|
2387 VM_G1IncCollectionPause op(gc_count_before, |
| 1973 | 2388 0, /* word_size */ |
| 2389 true, /* should_initiate_conc_mark */ | |
|
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2390 g1_policy()->max_pause_time_ms(), |
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2391 cause); |
|
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2392 VMThread::execute(&op); |
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2393 } else { |
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2394 if (cause == GCCause::_gc_locker |
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2395 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
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2396 |
| 1973 | 2397 // Schedule a standard evacuation pause. We're setting word_size |
| 2398 // to 0 which means that we are not requesting a post-GC allocation. | |
|
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2399 VM_G1IncCollectionPause op(gc_count_before, |
| 1973 | 2400 0, /* word_size */ |
|
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2401 false, /* should_initiate_conc_mark */ |
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2402 g1_policy()->max_pause_time_ms(), |
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2403 cause); |
|
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2404 VMThread::execute(&op); |
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2405 } else { |
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2406 // Schedule a Full GC. |
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2407 VM_G1CollectFull op(gc_count_before, full_gc_count_before, cause); |
|
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2408 VMThread::execute(&op); |
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|
2409 } |
| 342 | 2410 } |
| 2411 } | |
| 2412 | |
| 2413 bool G1CollectedHeap::is_in(const void* p) const { | |
| 3766 | 2414 HeapRegion* hr = _hrs.addr_to_region((HeapWord*) p); |
| 2415 if (hr != NULL) { | |
| 342 | 2416 return hr->is_in(p); |
| 2417 } else { | |
| 2418 return _perm_gen->as_gen()->is_in(p); | |
| 2419 } | |
| 2420 } | |
| 2421 | |
| 2422 // Iteration functions. | |
| 2423 | |
| 2424 // Iterates an OopClosure over all ref-containing fields of objects | |
| 2425 // within a HeapRegion. | |
| 2426 | |
| 2427 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
| 2428 MemRegion _mr; | |
| 2429 OopClosure* _cl; | |
| 2430 public: | |
| 2431 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
| 2432 : _mr(mr), _cl(cl) {} | |
| 2433 bool doHeapRegion(HeapRegion* r) { | |
| 2434 if (! r->continuesHumongous()) { | |
| 2435 r->oop_iterate(_cl); | |
| 2436 } | |
| 2437 return false; | |
| 2438 } | |
| 2439 }; | |
| 2440 | |
| 678 | 2441 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
| 342 | 2442 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
| 3766 | 2443 heap_region_iterate(&blk); |
| 678 | 2444 if (do_perm) { |
| 2445 perm_gen()->oop_iterate(cl); | |
| 2446 } | |
| 342 | 2447 } |
| 2448 | |
| 678 | 2449 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
| 342 | 2450 IterateOopClosureRegionClosure blk(mr, cl); |
| 3766 | 2451 heap_region_iterate(&blk); |
| 678 | 2452 if (do_perm) { |
| 2453 perm_gen()->oop_iterate(cl); | |
| 2454 } | |
| 342 | 2455 } |
| 2456 | |
| 2457 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
| 2458 | |
| 2459 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
| 2460 ObjectClosure* _cl; | |
| 2461 public: | |
| 2462 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
| 2463 bool doHeapRegion(HeapRegion* r) { | |
| 2464 if (! r->continuesHumongous()) { | |
| 2465 r->object_iterate(_cl); | |
| 2466 } | |
| 2467 return false; | |
| 2468 } | |
| 2469 }; | |
| 2470 | |
| 678 | 2471 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
| 342 | 2472 IterateObjectClosureRegionClosure blk(cl); |
| 3766 | 2473 heap_region_iterate(&blk); |
| 678 | 2474 if (do_perm) { |
| 2475 perm_gen()->object_iterate(cl); | |
| 2476 } | |
| 342 | 2477 } |
| 2478 | |
| 2479 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
| 2480 // FIXME: is this right? | |
| 2481 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
| 2482 } | |
| 2483 | |
| 2484 // Calls a SpaceClosure on a HeapRegion. | |
| 2485 | |
| 2486 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
| 2487 SpaceClosure* _cl; | |
| 2488 public: | |
| 2489 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
| 2490 bool doHeapRegion(HeapRegion* r) { | |
| 2491 _cl->do_space(r); | |
| 2492 return false; | |
| 2493 } | |
| 2494 }; | |
| 2495 | |
| 2496 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
| 2497 SpaceClosureRegionClosure blk(cl); | |
| 3766 | 2498 heap_region_iterate(&blk); |
| 342 | 2499 } |
| 2500 | |
| 3766 | 2501 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const { |
| 2502 _hrs.iterate(cl); | |
| 342 | 2503 } |
| 2504 | |
| 2505 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
| 3766 | 2506 HeapRegionClosure* cl) const { |
| 2507 _hrs.iterate_from(r, cl); | |
| 342 | 2508 } |
| 2509 | |
| 2510 void | |
| 2511 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
| 2512 int worker, | |
|
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2513 int no_of_par_workers, |
| 342 | 2514 jint claim_value) { |
| 355 | 2515 const size_t regions = n_regions(); |
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2516 const size_t max_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
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2517 no_of_par_workers : |
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2518 1); |
|
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2519 assert(UseDynamicNumberOfGCThreads || |
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2520 no_of_par_workers == workers()->total_workers(), |
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2521 "Non dynamic should use fixed number of workers"); |
| 355 | 2522 // try to spread out the starting points of the workers |
|
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2523 const size_t start_index = regions / max_workers * (size_t) worker; |
| 355 | 2524 |
| 2525 // each worker will actually look at all regions | |
| 2526 for (size_t count = 0; count < regions; ++count) { | |
| 2527 const size_t index = (start_index + count) % regions; | |
| 2528 assert(0 <= index && index < regions, "sanity"); | |
| 2529 HeapRegion* r = region_at(index); | |
| 2530 // we'll ignore "continues humongous" regions (we'll process them | |
| 2531 // when we come across their corresponding "start humongous" | |
| 2532 // region) and regions already claimed | |
| 2533 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
| 2534 continue; | |
| 2535 } | |
| 2536 // OK, try to claim it | |
| 342 | 2537 if (r->claimHeapRegion(claim_value)) { |
| 355 | 2538 // success! |
| 2539 assert(!r->continuesHumongous(), "sanity"); | |
| 2540 if (r->startsHumongous()) { | |
| 2541 // If the region is "starts humongous" we'll iterate over its | |
| 2542 // "continues humongous" first; in fact we'll do them | |
| 2543 // first. The order is important. In on case, calling the | |
| 2544 // closure on the "starts humongous" region might de-allocate | |
| 2545 // and clear all its "continues humongous" regions and, as a | |
| 2546 // result, we might end up processing them twice. So, we'll do | |
| 2547 // them first (notice: most closures will ignore them anyway) and | |
| 2548 // then we'll do the "starts humongous" region. | |
| 2549 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
| 2550 HeapRegion* chr = region_at(ch_index); | |
| 2551 | |
| 2552 // if the region has already been claimed or it's not | |
| 2553 // "continues humongous" we're done | |
| 2554 if (chr->claim_value() == claim_value || | |
| 2555 !chr->continuesHumongous()) { | |
| 2556 break; | |
| 2557 } | |
| 2558 | |
| 2559 // Noone should have claimed it directly. We can given | |
| 2560 // that we claimed its "starts humongous" region. | |
| 2561 assert(chr->claim_value() != claim_value, "sanity"); | |
| 2562 assert(chr->humongous_start_region() == r, "sanity"); | |
| 2563 | |
| 2564 if (chr->claimHeapRegion(claim_value)) { | |
| 2565 // we should always be able to claim it; noone else should | |
| 2566 // be trying to claim this region | |
| 2567 | |
| 2568 bool res2 = cl->doHeapRegion(chr); | |
| 2569 assert(!res2, "Should not abort"); | |
| 2570 | |
| 2571 // Right now, this holds (i.e., no closure that actually | |
| 2572 // does something with "continues humongous" regions | |
| 2573 // clears them). We might have to weaken it in the future, | |
| 2574 // but let's leave these two asserts here for extra safety. | |
| 2575 assert(chr->continuesHumongous(), "should still be the case"); | |
| 2576 assert(chr->humongous_start_region() == r, "sanity"); | |
| 2577 } else { | |
| 2578 guarantee(false, "we should not reach here"); | |
| 2579 } | |
| 2580 } | |
| 2581 } | |
| 2582 | |
| 2583 assert(!r->continuesHumongous(), "sanity"); | |
| 2584 bool res = cl->doHeapRegion(r); | |
| 2585 assert(!res, "Should not abort"); | |
| 2586 } | |
| 2587 } | |
| 2588 } | |
| 2589 | |
| 390 | 2590 class ResetClaimValuesClosure: public HeapRegionClosure { |
| 2591 public: | |
| 2592 bool doHeapRegion(HeapRegion* r) { | |
| 2593 r->set_claim_value(HeapRegion::InitialClaimValue); | |
| 2594 return false; | |
| 2595 } | |
| 2596 }; | |
| 2597 | |
| 2598 void | |
| 2599 G1CollectedHeap::reset_heap_region_claim_values() { | |
| 2600 ResetClaimValuesClosure blk; | |
| 2601 heap_region_iterate(&blk); | |
| 2602 } | |
| 2603 | |
| 355 | 2604 #ifdef ASSERT |
| 2605 // This checks whether all regions in the heap have the correct claim | |
| 2606 // value. I also piggy-backed on this a check to ensure that the | |
| 2607 // humongous_start_region() information on "continues humongous" | |
| 2608 // regions is correct. | |
| 2609 | |
| 2610 class CheckClaimValuesClosure : public HeapRegionClosure { | |
| 2611 private: | |
| 2612 jint _claim_value; | |
| 2613 size_t _failures; | |
| 2614 HeapRegion* _sh_region; | |
| 2615 public: | |
| 2616 CheckClaimValuesClosure(jint claim_value) : | |
| 2617 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
| 2618 bool doHeapRegion(HeapRegion* r) { | |
| 2619 if (r->claim_value() != _claim_value) { | |
|
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2620 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
| 355 | 2621 "claim value = %d, should be %d", |
|
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2622 HR_FORMAT_PARAMS(r), |
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2623 r->claim_value(), _claim_value); |
| 355 | 2624 ++_failures; |
| 2625 } | |
| 2626 if (!r->isHumongous()) { | |
| 2627 _sh_region = NULL; | |
| 2628 } else if (r->startsHumongous()) { | |
| 2629 _sh_region = r; | |
| 2630 } else if (r->continuesHumongous()) { | |
| 2631 if (r->humongous_start_region() != _sh_region) { | |
|
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2632 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
| 355 | 2633 "HS = "PTR_FORMAT", should be "PTR_FORMAT, |
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2634 HR_FORMAT_PARAMS(r), |
| 355 | 2635 r->humongous_start_region(), |
| 2636 _sh_region); | |
| 2637 ++_failures; | |
| 342 | 2638 } |
| 2639 } | |
| 355 | 2640 return false; |
| 2641 } | |
| 2642 size_t failures() { | |
| 2643 return _failures; | |
| 2644 } | |
| 2645 }; | |
| 2646 | |
| 2647 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
| 2648 CheckClaimValuesClosure cl(claim_value); | |
| 2649 heap_region_iterate(&cl); | |
| 2650 return cl.failures() == 0; | |
| 2651 } | |
|
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2652 |
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2653 class CheckClaimValuesInCSetHRClosure: public HeapRegionClosure { |
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2654 jint _claim_value; |
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2655 size_t _failures; |
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2656 |
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2657 public: |
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2658 CheckClaimValuesInCSetHRClosure(jint claim_value) : |
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2659 _claim_value(claim_value), |
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2660 _failures(0) { } |
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2661 |
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2662 size_t failures() { |
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2663 return _failures; |
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2664 } |
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2665 |
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2666 bool doHeapRegion(HeapRegion* hr) { |
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2667 assert(hr->in_collection_set(), "how?"); |
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2668 assert(!hr->isHumongous(), "H-region in CSet"); |
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2669 if (hr->claim_value() != _claim_value) { |
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2670 gclog_or_tty->print_cr("CSet Region " HR_FORMAT ", " |
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2671 "claim value = %d, should be %d", |
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2672 HR_FORMAT_PARAMS(hr), |
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2673 hr->claim_value(), _claim_value); |
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2674 _failures += 1; |
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2675 } |
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2676 return false; |
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2677 } |
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2678 }; |
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2679 |
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2680 bool G1CollectedHeap::check_cset_heap_region_claim_values(jint claim_value) { |
|
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2681 CheckClaimValuesInCSetHRClosure cl(claim_value); |
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2682 collection_set_iterate(&cl); |
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2683 return cl.failures() == 0; |
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2684 } |
| 355 | 2685 #endif // ASSERT |
| 342 | 2686 |
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|
2687 // We want the parallel threads to start their collection |
|
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|
2688 // set iteration at different collection set regions to |
|
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|
2689 // avoid contention. |
|
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|
2690 // If we have: |
|
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|
2691 // n collection set regions |
|
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|
2692 // p threads |
|
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|
2693 // Then thread t will start at region t * floor (n/p) |
|
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|
2694 |
|
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|
2695 HeapRegion* G1CollectedHeap::start_cset_region_for_worker(int worker_i) { |
|
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|
2696 HeapRegion* result = g1_policy()->collection_set(); |
|
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|
2697 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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2698 size_t cs_size = g1_policy()->cset_region_length(); |
|
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2699 int n_workers = workers()->total_workers(); |
|
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2700 size_t cs_spans = cs_size / n_workers; |
|
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2701 size_t ind = cs_spans * worker_i; |
|
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2702 for (size_t i = 0; i < ind; i++) { |
|
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|
2703 result = result->next_in_collection_set(); |
|
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|
2704 } |
|
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|
2705 } |
|
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|
2706 return result; |
|
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|
2707 } |
|
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|
2708 |
| 342 | 2709 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { |
| 2710 HeapRegion* r = g1_policy()->collection_set(); | |
| 2711 while (r != NULL) { | |
| 2712 HeapRegion* next = r->next_in_collection_set(); | |
| 2713 if (cl->doHeapRegion(r)) { | |
| 2714 cl->incomplete(); | |
| 2715 return; | |
| 2716 } | |
| 2717 r = next; | |
| 2718 } | |
| 2719 } | |
| 2720 | |
| 2721 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
| 2722 HeapRegionClosure *cl) { | |
|
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|
2723 if (r == NULL) { |
|
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|
2724 // The CSet is empty so there's nothing to do. |
|
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|
2725 return; |
|
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|
2726 } |
|
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|
2727 |
| 342 | 2728 assert(r->in_collection_set(), |
| 2729 "Start region must be a member of the collection set."); | |
| 2730 HeapRegion* cur = r; | |
| 2731 while (cur != NULL) { | |
| 2732 HeapRegion* next = cur->next_in_collection_set(); | |
| 2733 if (cl->doHeapRegion(cur) && false) { | |
| 2734 cl->incomplete(); | |
| 2735 return; | |
| 2736 } | |
| 2737 cur = next; | |
| 2738 } | |
| 2739 cur = g1_policy()->collection_set(); | |
| 2740 while (cur != r) { | |
| 2741 HeapRegion* next = cur->next_in_collection_set(); | |
| 2742 if (cl->doHeapRegion(cur) && false) { | |
| 2743 cl->incomplete(); | |
| 2744 return; | |
| 2745 } | |
| 2746 cur = next; | |
| 2747 } | |
| 2748 } | |
| 2749 | |
| 2750 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
| 3766 | 2751 return n_regions() > 0 ? region_at(0) : NULL; |
| 342 | 2752 } |
| 2753 | |
| 2754 | |
| 2755 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
| 2756 Space* res = heap_region_containing(addr); | |
| 2757 if (res == NULL) | |
| 2758 res = perm_gen()->space_containing(addr); | |
| 2759 return res; | |
| 2760 } | |
| 2761 | |
| 2762 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
| 2763 Space* sp = space_containing(addr); | |
| 2764 if (sp != NULL) { | |
| 2765 return sp->block_start(addr); | |
| 2766 } | |
| 2767 return NULL; | |
| 2768 } | |
| 2769 | |
| 2770 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
| 2771 Space* sp = space_containing(addr); | |
| 2772 assert(sp != NULL, "block_size of address outside of heap"); | |
| 2773 return sp->block_size(addr); | |
| 2774 } | |
| 2775 | |
| 2776 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
| 2777 Space* sp = space_containing(addr); | |
| 2778 return sp->block_is_obj(addr); | |
| 2779 } | |
| 2780 | |
| 2781 bool G1CollectedHeap::supports_tlab_allocation() const { | |
| 2782 return true; | |
| 2783 } | |
| 2784 | |
| 2785 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
| 2786 return HeapRegion::GrainBytes; | |
| 2787 } | |
| 2788 | |
| 2789 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
| 2790 // Return the remaining space in the cur alloc region, but not less than | |
| 2791 // the min TLAB size. | |
|
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|
2792 |
|
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|
2793 // Also, this value can be at most the humongous object threshold, |
|
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|
2794 // since we can't allow tlabs to grow big enough to accomodate |
|
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|
2795 // humongous objects. |
|
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|
2796 |
|
2433
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|
2797 HeapRegion* hr = _mutator_alloc_region.get(); |
|
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|
2798 size_t max_tlab_size = _humongous_object_threshold_in_words * wordSize; |
|
2433
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|
2799 if (hr == NULL) { |
|
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|
2800 return max_tlab_size; |
| 342 | 2801 } else { |
|
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|
2802 return MIN2(MAX2(hr->free(), (size_t) MinTLABSize), max_tlab_size); |
| 342 | 2803 } |
| 2804 } | |
| 2805 | |
| 2806 size_t G1CollectedHeap::max_capacity() const { | |
|
2188
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|
2807 return _g1_reserved.byte_size(); |
| 342 | 2808 } |
| 2809 | |
| 2810 jlong G1CollectedHeap::millis_since_last_gc() { | |
| 2811 // assert(false, "NYI"); | |
| 2812 return 0; | |
| 2813 } | |
| 2814 | |
| 2815 void G1CollectedHeap::prepare_for_verify() { | |
| 2816 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
| 2817 ensure_parsability(false); | |
| 2818 } | |
| 2819 g1_rem_set()->prepare_for_verify(); | |
| 2820 } | |
| 2821 | |
| 2822 class VerifyLivenessOopClosure: public OopClosure { | |
|
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|
2823 G1CollectedHeap* _g1h; |
|
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|
2824 VerifyOption _vo; |
| 342 | 2825 public: |
|
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|
2826 VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo): |
|
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|
2827 _g1h(g1h), _vo(vo) |
|
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|
2828 { } |
|
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|
2829 void do_oop(narrowOop *p) { do_oop_work(p); } |
|
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diff
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|
2830 void do_oop( oop *p) { do_oop_work(p); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
2831 |
|
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|
2832 template <class T> void do_oop_work(T *p) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
2833 oop obj = oopDesc::load_decode_heap_oop(p); |
|
3772
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|
2834 guarantee(obj == NULL || !_g1h->is_obj_dead_cond(obj, _vo), |
|
845
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|
2835 "Dead object referenced by a not dead object"); |
| 342 | 2836 } |
| 2837 }; | |
| 2838 | |
| 2839 class VerifyObjsInRegionClosure: public ObjectClosure { | |
| 811 | 2840 private: |
| 342 | 2841 G1CollectedHeap* _g1h; |
| 2842 size_t _live_bytes; | |
| 2843 HeapRegion *_hr; | |
|
3772
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changeset
|
2844 VerifyOption _vo; |
| 342 | 2845 public: |
|
3772
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|
2846 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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diff
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|
2847 // _vo == UseNextMarking -> use "next" marking information, |
|
6747fd0512e0
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|
2848 // _vo == UseMarkWord -> use mark word from object header. |
|
6747fd0512e0
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|
2849 VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo) |
|
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|
2850 : _live_bytes(0), _hr(hr), _vo(vo) { |
| 342 | 2851 _g1h = G1CollectedHeap::heap(); |
| 2852 } | |
| 2853 void do_object(oop o) { | |
|
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changeset
|
2854 VerifyLivenessOopClosure isLive(_g1h, _vo); |
| 342 | 2855 assert(o != NULL, "Huh?"); |
|
3772
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|
2856 if (!_g1h->is_obj_dead_cond(o, _vo)) { |
|
6747fd0512e0
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changeset
|
2857 // If the object is alive according to the mark word, |
|
6747fd0512e0
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diff
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|
2858 // then verify that the marking information agrees. |
|
6747fd0512e0
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changeset
|
2859 // Note we can't verify the contra-positive of the |
|
6747fd0512e0
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diff
changeset
|
2860 // above: if the object is dead (according to the mark |
|
6747fd0512e0
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diff
changeset
|
2861 // word), it may not be marked, or may have been marked |
|
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changeset
|
2862 // but has since became dead, or may have been allocated |
|
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7004681: G1: Extend marking verification to Full GCs
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diff
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|
2863 // since the last marking. |
|
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|
2864 if (_vo == VerifyOption_G1UseMarkWord) { |
|
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changeset
|
2865 guarantee(!_g1h->is_obj_dead(o), "mark word and concurrent mark mismatch"); |
|
6747fd0512e0
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|
2866 } |
|
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|
2867 |
| 342 | 2868 o->oop_iterate(&isLive); |
|
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|
2869 if (!_hr->obj_allocated_since_prev_marking(o)) { |
|
5dbd9300cf9c
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|
2870 size_t obj_size = o->size(); // Make sure we don't overflow |
|
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|
2871 _live_bytes += (obj_size * HeapWordSize); |
|
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|
2872 } |
| 342 | 2873 } |
| 2874 } | |
| 2875 size_t live_bytes() { return _live_bytes; } | |
| 2876 }; | |
| 2877 | |
| 2878 class PrintObjsInRegionClosure : public ObjectClosure { | |
| 2879 HeapRegion *_hr; | |
| 2880 G1CollectedHeap *_g1; | |
| 2881 public: | |
| 2882 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
| 2883 _g1 = G1CollectedHeap::heap(); | |
| 2884 }; | |
| 2885 | |
| 2886 void do_object(oop o) { | |
| 2887 if (o != NULL) { | |
| 2888 HeapWord *start = (HeapWord *) o; | |
| 2889 size_t word_sz = o->size(); | |
| 2890 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
| 2891 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
| 2892 (void*) o, word_sz, | |
| 2893 _g1->isMarkedPrev(o), | |
| 2894 _g1->isMarkedNext(o), | |
| 2895 _hr->obj_allocated_since_prev_marking(o)); | |
| 2896 HeapWord *end = start + word_sz; | |
| 2897 HeapWord *cur; | |
| 2898 int *val; | |
| 2899 for (cur = start; cur < end; cur++) { | |
| 2900 val = (int *) cur; | |
| 2901 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
| 2902 } | |
| 2903 } | |
| 2904 } | |
| 2905 }; | |
| 2906 | |
| 2907 class VerifyRegionClosure: public HeapRegionClosure { | |
| 811 | 2908 private: |
|
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|
2909 bool _allow_dirty; |
|
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|
2910 bool _par; |
|
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|
2911 VerifyOption _vo; |
|
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|
2912 bool _failures; |
| 811 | 2913 public: |
|
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|
2914 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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|
2915 // _vo == UseNextMarking -> use "next" marking information, |
|
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|
2916 // _vo == UseMarkWord -> use mark word from object header. |
|
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|
2917 VerifyRegionClosure(bool allow_dirty, bool par, VerifyOption vo) |
|
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|
2918 : _allow_dirty(allow_dirty), |
|
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|
2919 _par(par), |
|
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|
2920 _vo(vo), |
|
1020
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|
2921 _failures(false) {} |
|
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2922 |
|
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|
2923 bool failures() { |
|
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|
2924 return _failures; |
|
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|
2925 } |
|
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|
2926 |
| 342 | 2927 bool doHeapRegion(HeapRegion* r) { |
| 390 | 2928 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
| 2929 "Should be unclaimed at verify points."); | |
|
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|
2930 if (!r->continuesHumongous()) { |
|
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|
2931 bool failures = false; |
|
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|
2932 r->verify(_allow_dirty, _vo, &failures); |
|
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|
2933 if (failures) { |
|
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|
2934 _failures = true; |
|
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|
2935 } else { |
|
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|
2936 VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo); |
|
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|
2937 r->object_iterate(¬_dead_yet_cl); |
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2938 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
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|
2939 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
|
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|
2940 "max_live_bytes "SIZE_FORMAT" " |
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|
2941 "< calculated "SIZE_FORMAT, |
|
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|
2942 r->bottom(), r->end(), |
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|
2943 r->max_live_bytes(), |
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|
2944 not_dead_yet_cl.live_bytes()); |
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|
2945 _failures = true; |
|
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|
2946 } |
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|
2947 } |
| 342 | 2948 } |
|
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|
2949 return false; // stop the region iteration if we hit a failure |
| 342 | 2950 } |
| 2951 }; | |
| 2952 | |
| 2953 class VerifyRootsClosure: public OopsInGenClosure { | |
| 2954 private: | |
| 2955 G1CollectedHeap* _g1h; | |
|
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|
2956 VerifyOption _vo; |
| 342 | 2957 bool _failures; |
| 2958 public: | |
|
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2959 // _vo == UsePrevMarking -> use "prev" marking information, |
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2960 // _vo == UseNextMarking -> use "next" marking information, |
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2961 // _vo == UseMarkWord -> use mark word from object header. |
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|
2962 VerifyRootsClosure(VerifyOption vo) : |
|
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2963 _g1h(G1CollectedHeap::heap()), |
|
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|
2964 _vo(vo), |
|
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|
2965 _failures(false) { } |
| 342 | 2966 |
| 2967 bool failures() { return _failures; } | |
| 2968 | |
|
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|
2969 template <class T> void do_oop_nv(T* p) { |
|
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|
2970 T heap_oop = oopDesc::load_heap_oop(p); |
|
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|
2971 if (!oopDesc::is_null(heap_oop)) { |
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|
2972 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
|
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|
2973 if (_g1h->is_obj_dead_cond(obj, _vo)) { |
| 342 | 2974 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
|
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|
2975 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
|
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|
2976 if (_vo == VerifyOption_G1UseMarkWord) { |
|
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|
2977 gclog_or_tty->print_cr(" Mark word: "PTR_FORMAT, (void*)(obj->mark())); |
|
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|
2978 } |
| 342 | 2979 obj->print_on(gclog_or_tty); |
| 2980 _failures = true; | |
| 2981 } | |
| 2982 } | |
| 2983 } | |
|
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|
2984 |
|
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|
2985 void do_oop(oop* p) { do_oop_nv(p); } |
|
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|
2986 void do_oop(narrowOop* p) { do_oop_nv(p); } |
| 342 | 2987 }; |
| 2988 | |
| 390 | 2989 // This is the task used for parallel heap verification. |
| 2990 | |
| 2991 class G1ParVerifyTask: public AbstractGangTask { | |
| 2992 private: | |
| 2993 G1CollectedHeap* _g1h; | |
|
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|
2994 bool _allow_dirty; |
|
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|
2995 VerifyOption _vo; |
|
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|
2996 bool _failures; |
| 390 | 2997 |
| 2998 public: | |
|
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|
2999 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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|
3000 // _vo == UseNextMarking -> use "next" marking information, |
|
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|
3001 // _vo == UseMarkWord -> use mark word from object header. |
|
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|
3002 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, VerifyOption vo) : |
| 390 | 3003 AbstractGangTask("Parallel verify task"), |
|
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|
3004 _g1h(g1h), |
|
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|
3005 _allow_dirty(allow_dirty), |
|
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|
3006 _vo(vo), |
|
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|
3007 _failures(false) { } |
|
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|
3008 |
|
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|
3009 bool failures() { |
|
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|
3010 return _failures; |
|
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|
3011 } |
| 390 | 3012 |
| 3013 void work(int worker_i) { | |
|
637
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|
3014 HandleMark hm; |
|
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changeset
|
3015 VerifyRegionClosure blk(_allow_dirty, true, _vo); |
| 390 | 3016 _g1h->heap_region_par_iterate_chunked(&blk, worker_i, |
|
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|
3017 _g1h->workers()->active_workers(), |
| 390 | 3018 HeapRegion::ParVerifyClaimValue); |
|
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|
3019 if (blk.failures()) { |
|
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|
3020 _failures = true; |
|
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|
3021 } |
| 390 | 3022 } |
| 3023 }; | |
| 3024 | |
| 342 | 3025 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
|
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|
3026 verify(allow_dirty, silent, VerifyOption_G1UsePrevMarking); |
| 811 | 3027 } |
| 3028 | |
| 3029 void G1CollectedHeap::verify(bool allow_dirty, | |
| 3030 bool silent, | |
|
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|
3031 VerifyOption vo) { |
| 342 | 3032 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
|
3293
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|
3033 if (!silent) { gclog_or_tty->print("Roots (excluding permgen) "); } |
|
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|
3034 VerifyRootsClosure rootsCl(vo); |
|
4095
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|
3035 |
|
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|
3036 assert(Thread::current()->is_VM_thread(), |
|
bca17e38de00
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|
3037 "Expected to be executed serially by the VM thread at this point"); |
|
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|
3038 |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
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diff
changeset
|
3039 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
|
3772
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|
3040 |
|
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|
3041 // We apply the relevant closures to all the oops in the |
|
1f4413413144
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|
3042 // system dictionary, the string table and the code cache. |
|
1f4413413144
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changeset
|
3043 const int so = SharedHeap::SO_AllClasses | SharedHeap::SO_Strings | SharedHeap::SO_CodeCache; |
|
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|
3044 |
|
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|
3045 process_strong_roots(true, // activate StrongRootsScope |
|
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|
3046 true, // we set "collecting perm gen" to true, |
|
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|
3047 // so we don't reset the dirty cards in the perm gen. |
|
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|
3048 SharedHeap::ScanningOption(so), // roots scanning options |
| 342 | 3049 &rootsCl, |
|
989
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|
3050 &blobsCl, |
| 342 | 3051 &rootsCl); |
|
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|
3052 |
|
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|
3053 // If we're verifying after the marking phase of a Full GC then we can't |
|
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|
3054 // treat the perm gen as roots into the G1 heap. Some of the objects in |
|
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|
3055 // the perm gen may be dead and hence not marked. If one of these dead |
|
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|
3056 // objects is considered to be a root then we may end up with a false |
|
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|
3057 // "Root location <x> points to dead ob <y>" failure. |
|
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|
3058 if (vo != VerifyOption_G1UseMarkWord) { |
|
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|
3059 // Since we used "collecting_perm_gen" == true above, we will not have |
|
6747fd0512e0
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|
3060 // checked the refs from perm into the G1-collected heap. We check those |
|
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|
3061 // references explicitly below. Whether the relevant cards are dirty |
|
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|
3062 // is checked further below in the rem set verification. |
|
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diff
changeset
|
3063 if (!silent) { gclog_or_tty->print("Permgen roots "); } |
|
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changeset
|
3064 perm_gen()->oop_iterate(&rootsCl); |
|
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|
3065 } |
|
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|
3066 bool failures = rootsCl.failures(); |
|
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|
3067 |
|
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|
3068 if (vo != VerifyOption_G1UseMarkWord) { |
|
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changeset
|
3069 // If we're verifying during a full GC then the region sets |
|
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changeset
|
3070 // will have been torn down at the start of the GC. Therefore |
|
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|
3071 // verifying the region sets will fail. So we only verify |
|
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changeset
|
3072 // the region sets when not in a full GC. |
|
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diff
changeset
|
3073 if (!silent) { gclog_or_tty->print("HeapRegionSets "); } |
|
6747fd0512e0
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changeset
|
3074 verify_region_sets(); |
|
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changeset
|
3075 } |
|
6747fd0512e0
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|
3076 |
| 2152 | 3077 if (!silent) { gclog_or_tty->print("HeapRegions "); } |
| 390 | 3078 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
| 3079 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 3080 "sanity check"); | |
| 3081 | |
|
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|
3082 G1ParVerifyTask task(this, allow_dirty, vo); |
|
4095
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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
3083 assert(UseDynamicNumberOfGCThreads || |
|
bca17e38de00
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|
3084 workers()->active_workers() == workers()->total_workers(), |
|
bca17e38de00
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|
3085 "If not dynamic should be using all the workers"); |
|
bca17e38de00
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|
3086 int n_workers = workers()->active_workers(); |
| 390 | 3087 set_par_threads(n_workers); |
| 3088 workers()->run_task(&task); | |
| 3089 set_par_threads(0); | |
|
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|
3090 if (task.failures()) { |
|
ff2402f6a50b
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changeset
|
3091 failures = true; |
|
ff2402f6a50b
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|
3092 } |
| 390 | 3093 |
|
4095
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|
3094 // Checks that the expected amount of parallel work was done. |
|
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|
3095 // The implication is that n_workers is > 0. |
| 390 | 3096 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), |
| 3097 "sanity check"); | |
| 3098 | |
| 3099 reset_heap_region_claim_values(); | |
| 3100 | |
| 3101 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 3102 "sanity check"); | |
| 3103 } else { | |
|
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|
3104 VerifyRegionClosure blk(allow_dirty, false, vo); |
| 3766 | 3105 heap_region_iterate(&blk); |
|
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|
3106 if (blk.failures()) { |
|
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|
3107 failures = true; |
|
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|
3108 } |
| 390 | 3109 } |
| 2152 | 3110 if (!silent) gclog_or_tty->print("RemSet "); |
| 342 | 3111 rem_set()->verify(); |
|
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|
3112 |
|
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|
3113 if (failures) { |
|
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|
3114 gclog_or_tty->print_cr("Heap:"); |
|
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|
3115 // It helps to have the per-region information in the output to |
|
53074c2c4600
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|
3116 // help us track down what went wrong. This is why we call |
|
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|
3117 // print_extended_on() instead of print_on(). |
|
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|
3118 print_extended_on(gclog_or_tty); |
|
1020
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|
3119 gclog_or_tty->print_cr(""); |
|
1547
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|
3120 #ifndef PRODUCT |
| 1044 | 3121 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
| 1388 | 3122 concurrent_mark()->print_reachable("at-verification-failure", |
|
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|
3123 vo, false /* all */); |
|
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|
3124 } |
|
1547
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|
3125 #endif |
|
1020
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|
3126 gclog_or_tty->flush(); |
|
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|
3127 } |
|
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|
3128 guarantee(!failures, "there should not have been any failures"); |
| 342 | 3129 } else { |
| 3130 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
| 3131 } | |
| 3132 } | |
| 3133 | |
| 3134 class PrintRegionClosure: public HeapRegionClosure { | |
| 3135 outputStream* _st; | |
| 3136 public: | |
| 3137 PrintRegionClosure(outputStream* st) : _st(st) {} | |
| 3138 bool doHeapRegion(HeapRegion* r) { | |
| 3139 r->print_on(_st); | |
| 3140 return false; | |
| 3141 } | |
| 3142 }; | |
| 3143 | |
| 3144 void G1CollectedHeap::print_on(outputStream* st) const { | |
|
838
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|
3145 st->print(" %-20s", "garbage-first heap"); |
|
0316eac49d5a
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|
3146 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")
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|
3147 capacity()/K, used_unlocked()/K); |
|
838
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|
3148 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
|
0316eac49d5a
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|
3149 _g1_storage.low_boundary(), |
|
0316eac49d5a
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|
3150 _g1_storage.high(), |
|
0316eac49d5a
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|
3151 _g1_storage.high_boundary()); |
|
0316eac49d5a
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|
3152 st->cr(); |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
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diff
changeset
|
3153 st->print(" region size " SIZE_FORMAT "K, ", HeapRegion::GrainBytes / K); |
|
838
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|
3154 size_t young_regions = _young_list->length(); |
|
0316eac49d5a
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|
3155 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
|
0316eac49d5a
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|
3156 young_regions, young_regions * HeapRegion::GrainBytes / K); |
|
0316eac49d5a
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|
3157 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
|
0316eac49d5a
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|
3158 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
|
0316eac49d5a
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|
3159 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
|
0316eac49d5a
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|
3160 st->cr(); |
|
0316eac49d5a
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|
3161 perm()->as_gen()->print_on(st); |
|
4073
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|
3162 } |
|
53074c2c4600
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|
3163 |
|
53074c2c4600
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|
3164 void G1CollectedHeap::print_extended_on(outputStream* st) const { |
|
53074c2c4600
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|
3165 print_on(st); |
|
53074c2c4600
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|
3166 |
|
53074c2c4600
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|
3167 // Print the per-region information. |
|
53074c2c4600
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|
3168 st->cr(); |
|
53074c2c4600
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|
3169 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 | 3170 PrintRegionClosure blk(st); |
| 3766 | 3171 heap_region_iterate(&blk); |
| 342 | 3172 } |
| 3173 | |
| 3174 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
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1755
diff
changeset
|
3175 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 1019 | 3176 workers()->print_worker_threads_on(st); |
| 3177 } | |
| 3178 _cmThread->print_on(st); | |
| 342 | 3179 st->cr(); |
| 1019 | 3180 _cm->print_worker_threads_on(st); |
| 3181 _cg1r->print_worker_threads_on(st); | |
| 342 | 3182 st->cr(); |
| 3183 } | |
| 3184 | |
| 3185 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
|
1833
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jmasa
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diff
changeset
|
3186 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3187 workers()->threads_do(tc); |
| 3188 } | |
| 3189 tc->do_thread(_cmThread); | |
| 794 | 3190 _cg1r->threads_do(tc); |
| 342 | 3191 } |
| 3192 | |
| 3193 void G1CollectedHeap::print_tracing_info() const { | |
| 3194 // We'll overload this to mean "trace GC pause statistics." | |
| 3195 if (TraceGen0Time || TraceGen1Time) { | |
| 3196 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
| 3197 // to that. | |
| 3198 g1_policy()->print_tracing_info(); | |
| 3199 } | |
| 751 | 3200 if (G1SummarizeRSetStats) { |
| 342 | 3201 g1_rem_set()->print_summary_info(); |
| 3202 } | |
| 1282 | 3203 if (G1SummarizeConcMark) { |
| 342 | 3204 concurrent_mark()->print_summary_info(); |
| 3205 } | |
| 3206 g1_policy()->print_yg_surv_rate_info(); | |
| 3207 SpecializationStats::print(); | |
| 3208 } | |
| 3209 | |
|
3777
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|
3210 #ifndef PRODUCT |
|
e8b0b0392037
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|
3211 // Helpful for debugging RSet issues. |
|
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changeset
|
3212 |
|
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|
3213 class PrintRSetsClosure : public HeapRegionClosure { |
|
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|
3214 private: |
|
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changeset
|
3215 const char* _msg; |
|
e8b0b0392037
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|
3216 size_t _occupied_sum; |
|
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|
3217 |
|
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|
3218 public: |
|
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|
3219 bool doHeapRegion(HeapRegion* r) { |
|
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|
3220 HeapRegionRemSet* hrrs = r->rem_set(); |
|
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|
3221 size_t occupied = hrrs->occupied(); |
|
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|
3222 _occupied_sum += occupied; |
|
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|
3223 |
|
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|
3224 gclog_or_tty->print_cr("Printing RSet for region "HR_FORMAT, |
|
e8b0b0392037
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|
3225 HR_FORMAT_PARAMS(r)); |
|
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|
3226 if (occupied == 0) { |
|
e8b0b0392037
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changeset
|
3227 gclog_or_tty->print_cr(" RSet is empty"); |
|
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|
3228 } else { |
|
e8b0b0392037
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changeset
|
3229 hrrs->print(); |
|
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|
3230 } |
|
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|
3231 gclog_or_tty->print_cr("----------"); |
|
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|
3232 return false; |
|
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|
3233 } |
|
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|
3234 |
|
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|
3235 PrintRSetsClosure(const char* msg) : _msg(msg), _occupied_sum(0) { |
|
e8b0b0392037
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|
3236 gclog_or_tty->cr(); |
|
e8b0b0392037
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changeset
|
3237 gclog_or_tty->print_cr("========================================"); |
|
e8b0b0392037
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changeset
|
3238 gclog_or_tty->print_cr(msg); |
|
e8b0b0392037
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changeset
|
3239 gclog_or_tty->cr(); |
|
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|
3240 } |
|
e8b0b0392037
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|
3241 |
|
e8b0b0392037
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|
3242 ~PrintRSetsClosure() { |
|
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changeset
|
3243 gclog_or_tty->print_cr("Occupied Sum: "SIZE_FORMAT, _occupied_sum); |
|
e8b0b0392037
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changeset
|
3244 gclog_or_tty->print_cr("========================================"); |
|
e8b0b0392037
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changeset
|
3245 gclog_or_tty->cr(); |
|
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changeset
|
3246 } |
|
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|
3247 }; |
|
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|
3248 |
|
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|
3249 void G1CollectedHeap::print_cset_rsets() { |
|
e8b0b0392037
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changeset
|
3250 PrintRSetsClosure cl("Printing CSet RSets"); |
|
e8b0b0392037
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diff
changeset
|
3251 collection_set_iterate(&cl); |
|
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changeset
|
3252 } |
|
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|
3253 |
|
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|
3254 void G1CollectedHeap::print_all_rsets() { |
|
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|
3255 PrintRSetsClosure cl("Printing All RSets");; |
|
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|
3256 heap_region_iterate(&cl); |
|
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|
3257 } |
|
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|
3258 #endif // PRODUCT |
|
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|
3259 |
| 342 | 3260 G1CollectedHeap* G1CollectedHeap::heap() { |
| 3261 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
| 3262 "not a garbage-first heap"); | |
| 3263 return _g1h; | |
| 3264 } | |
| 3265 | |
| 3266 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
|
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|
3267 // always_do_update_barrier = false; |
| 342 | 3268 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
| 3269 // Call allocation profiler | |
| 3270 AllocationProfiler::iterate_since_last_gc(); | |
| 3271 // Fill TLAB's and such | |
| 3272 ensure_parsability(true); | |
| 3273 } | |
| 3274 | |
| 3275 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
| 3276 // FIXME: what is this about? | |
| 3277 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
| 3278 // is set. | |
| 3279 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
| 3280 "derived pointer present")); | |
|
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|
3281 // always_do_update_barrier = true; |
|
3979
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|
3282 |
|
4dfb2df418f2
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|
3283 // We have just completed a GC. Update the soft reference |
|
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|
3284 // policy with the new heap occupancy |
|
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|
3285 Universe::update_heap_info_at_gc(); |
| 342 | 3286 } |
| 3287 | |
| 1973 | 3288 HeapWord* G1CollectedHeap::do_collection_pause(size_t word_size, |
| 3289 unsigned int gc_count_before, | |
| 3290 bool* succeeded) { | |
| 3291 assert_heap_not_locked_and_not_at_safepoint(); | |
| 342 | 3292 g1_policy()->record_stop_world_start(); |
| 1973 | 3293 VM_G1IncCollectionPause op(gc_count_before, |
| 3294 word_size, | |
| 3295 false, /* should_initiate_conc_mark */ | |
| 3296 g1_policy()->max_pause_time_ms(), | |
| 3297 GCCause::_g1_inc_collection_pause); | |
| 3298 VMThread::execute(&op); | |
| 3299 | |
| 3300 HeapWord* result = op.result(); | |
| 3301 bool ret_succeeded = op.prologue_succeeded() && op.pause_succeeded(); | |
| 3302 assert(result == NULL || ret_succeeded, | |
| 3303 "the result should be NULL if the VM did not succeed"); | |
| 3304 *succeeded = ret_succeeded; | |
| 3305 | |
| 3306 assert_heap_not_locked(); | |
| 3307 return result; | |
| 342 | 3308 } |
| 3309 | |
| 3310 void | |
| 3311 G1CollectedHeap::doConcurrentMark() { | |
|
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|
3312 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
|
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|
3313 if (!_cmThread->in_progress()) { |
|
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|
3314 _cmThread->set_started(); |
|
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|
3315 CGC_lock->notify(); |
| 342 | 3316 } |
| 3317 } | |
| 3318 | |
| 3319 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
| 3320 bool young) { | |
| 3321 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
| 3322 } | |
| 3323 | |
| 3324 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
| 3325 predicted_time_ms) { | |
| 3326 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
| 3327 } | |
| 3328 | |
| 3329 size_t G1CollectedHeap::pending_card_num() { | |
| 3330 size_t extra_cards = 0; | |
| 3331 JavaThread *curr = Threads::first(); | |
| 3332 while (curr != NULL) { | |
| 3333 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
| 3334 extra_cards += dcq.size(); | |
| 3335 curr = curr->next(); | |
| 3336 } | |
| 3337 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 3338 size_t buffer_size = dcqs.buffer_size(); | |
| 3339 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 3340 return buffer_size * buffer_num + extra_cards; | |
| 3341 } | |
| 3342 | |
| 3343 size_t G1CollectedHeap::max_pending_card_num() { | |
| 3344 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 3345 size_t buffer_size = dcqs.buffer_size(); | |
| 3346 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 3347 int thread_num = Threads::number_of_threads(); | |
| 3348 return (buffer_num + thread_num) * buffer_size; | |
| 3349 } | |
| 3350 | |
| 3351 size_t G1CollectedHeap::cards_scanned() { | |
| 1861 | 3352 return g1_rem_set()->cardsScanned(); |
| 342 | 3353 } |
| 3354 | |
| 3355 void | |
| 3356 G1CollectedHeap::setup_surviving_young_words() { | |
| 3357 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
|
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|
3358 size_t array_length = g1_policy()->young_cset_region_length(); |
| 342 | 3359 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); |
| 3360 if (_surviving_young_words == NULL) { | |
| 3361 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
| 3362 "Not enough space for young surv words summary."); | |
| 3363 } | |
| 3364 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
|
845
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|
3365 #ifdef ASSERT |
| 342 | 3366 for (size_t i = 0; i < array_length; ++i) { |
|
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|
3367 assert( _surviving_young_words[i] == 0, "memset above" ); |
|
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|
3368 } |
|
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|
3369 #endif // !ASSERT |
| 342 | 3370 } |
| 3371 | |
| 3372 void | |
| 3373 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
| 3374 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
|
4090
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|
3375 size_t array_length = g1_policy()->young_cset_region_length(); |
| 342 | 3376 for (size_t i = 0; i < array_length; ++i) |
| 3377 _surviving_young_words[i] += surv_young_words[i]; | |
| 3378 } | |
| 3379 | |
| 3380 void | |
| 3381 G1CollectedHeap::cleanup_surviving_young_words() { | |
| 3382 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
| 3383 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
| 3384 _surviving_young_words = NULL; | |
| 3385 } | |
| 3386 | |
|
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|
3387 #ifdef ASSERT |
|
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|
3388 class VerifyCSetClosure: public HeapRegionClosure { |
|
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|
3389 public: |
|
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diff
changeset
|
3390 bool doHeapRegion(HeapRegion* hr) { |
|
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7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3391 // Here we check that the CSet region's RSet is ready for parallel |
|
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diff
changeset
|
3392 // iteration. The fields that we'll verify are only manipulated |
|
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diff
changeset
|
3393 // when the region is part of a CSet and is collected. Afterwards, |
|
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diff
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|
3394 // we reset these fields when we clear the region's RSet (when the |
|
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diff
changeset
|
3395 // region is freed) so they are ready when the region is |
|
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diff
changeset
|
3396 // re-allocated. The only exception to this is if there's an |
|
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diff
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|
3397 // evacuation failure and instead of freeing the region we leave |
|
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diff
changeset
|
3398 // it in the heap. In that case, we reset these fields during |
|
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diff
changeset
|
3399 // evacuation failure handling. |
|
e8b0b0392037
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changeset
|
3400 guarantee(hr->rem_set()->verify_ready_for_par_iteration(), "verification"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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changeset
|
3401 |
|
e8b0b0392037
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diff
changeset
|
3402 // Here's a good place to add any other checks we'd like to |
|
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diff
changeset
|
3403 // perform on CSet regions. |
|
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3404 return false; |
|
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3405 } |
|
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3406 }; |
|
3777
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diff
changeset
|
3407 #endif // ASSERT |
|
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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diff
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|
3408 |
| 1709 | 3409 #if TASKQUEUE_STATS |
| 3410 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
| 3411 st->print_raw_cr("GC Task Stats"); | |
| 3412 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
| 3413 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
| 3414 } | |
| 3415 | |
| 3416 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
| 3417 print_taskqueue_stats_hdr(st); | |
| 3418 | |
| 3419 TaskQueueStats totals; | |
|
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3420 const int n = workers() != NULL ? workers()->total_workers() : 1; |
| 1709 | 3421 for (int i = 0; i < n; ++i) { |
| 3422 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
| 3423 totals += task_queue(i)->stats; | |
| 3424 } | |
| 3425 st->print_raw("tot "); totals.print(st); st->cr(); | |
| 3426 | |
| 3427 DEBUG_ONLY(totals.verify()); | |
| 3428 } | |
| 3429 | |
| 3430 void G1CollectedHeap::reset_taskqueue_stats() { | |
|
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3431 const int n = workers() != NULL ? workers()->total_workers() : 1; |
| 1709 | 3432 for (int i = 0; i < n; ++i) { |
| 3433 task_queue(i)->stats.reset(); | |
| 3434 } | |
| 3435 } | |
| 3436 #endif // TASKQUEUE_STATS | |
| 3437 | |
| 1973 | 3438 bool |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
changeset
|
3439 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
| 2152 | 3440 assert_at_safepoint(true /* should_be_vm_thread */); |
| 3441 guarantee(!is_gc_active(), "collection is not reentrant"); | |
| 3442 | |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3443 if (GC_locker::check_active_before_gc()) { |
| 1973 | 3444 return false; |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1313
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|
3445 } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1313
diff
changeset
|
3446 |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2039
diff
changeset
|
3447 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
|
2039
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
parents:
2038
diff
changeset
|
3448 ResourceMark rm; |
|
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
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2038
diff
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|
3449 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3450 if (PrintHeapAtGC) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3451 Universe::print_heap_before_gc(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3452 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3453 |
| 4072 | 3454 HRSPhaseSetter x(HRSPhaseEvacuation); |
| 2152 | 3455 verify_region_sets_optional(); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
changeset
|
3456 verify_dirty_young_regions(); |
| 2152 | 3457 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3458 { |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3459 // This call will decide whether this pause is an initial-mark |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1313
diff
changeset
|
3460 // pause. If it is, during_initial_mark_pause() will return true |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3461 // for the duration of this pause. |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3462 g1_policy()->decide_on_conc_mark_initiation(); |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
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|
3463 |
|
3982
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
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3980
diff
changeset
|
3464 // We do not allow initial-mark to be piggy-backed on a |
|
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
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3980
diff
changeset
|
3465 // partially-young GC. |
|
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
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3980
diff
changeset
|
3466 assert(!g1_policy()->during_initial_mark_pause() || |
|
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
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3980
diff
changeset
|
3467 g1_policy()->full_young_gcs(), "sanity"); |
|
273b46400613
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3980
diff
changeset
|
3468 |
|
273b46400613
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3980
diff
changeset
|
3469 // We also do not allow partially-young GCs during marking. |
|
273b46400613
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3980
diff
changeset
|
3470 assert(!mark_in_progress() || g1_policy()->full_young_gcs(), "sanity"); |
|
273b46400613
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3980
diff
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|
3471 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3472 char verbose_str[128]; |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
changeset
|
3473 sprintf(verbose_str, "GC pause "); |
|
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3474 if (g1_policy()->full_young_gcs()) { |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
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3830
diff
changeset
|
3475 strcat(verbose_str, "(young)"); |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
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3830
diff
changeset
|
3476 } else { |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3477 strcat(verbose_str, "(partial)"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3478 } |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3479 if (g1_policy()->during_initial_mark_pause()) { |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3480 strcat(verbose_str, " (initial-mark)"); |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3481 // 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
|
3482 // full collection counter. |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3483 increment_total_full_collections(); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3484 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3485 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3486 // 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
|
3487 // 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
|
3488 // is messy if we do. |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3489 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3490 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3491 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
|
3492 |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3493 TraceCollectorStats tcs(g1mm()->incremental_collection_counters()); |
|
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
3494 TraceMemoryManagerStats tms(false /* fullGC */, gc_cause()); |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3495 |
| 2361 | 3496 // If the secondary_free_list is not empty, append it to the |
| 3497 // free_list. No need to wait for the cleanup operation to finish; | |
| 3498 // the region allocation code will check the secondary_free_list | |
| 3499 // and wait if necessary. If the G1StressConcRegionFreeing flag is | |
| 3500 // set, skip this step so that the region allocation code has to | |
| 3501 // get entries from the secondary_free_list. | |
| 2152 | 3502 if (!G1StressConcRegionFreeing) { |
| 2361 | 3503 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 3504 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3505 |
|
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3506 assert(check_young_list_well_formed(), |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3507 "young list should be well formed"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3508 |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3509 // 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
|
3510 // 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
|
3511 // it will be set. |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3512 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3513 { // 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
|
3514 IsGCActiveMark x; |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3515 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3516 gc_prologue(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3517 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
|
3518 increment_gc_time_stamp(); |
| 342 | 3519 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3520 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3521 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
|
3522 gclog_or_tty->print(" VerifyBeforeGC:"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3523 prepare_for_verify(); |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3524 Universe::verify(/* allow dirty */ false, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3525 /* silent */ false, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3526 /* option */ VerifyOption_G1UsePrevMarking); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3527 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3528 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3529 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3530 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3531 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3532 // Please see comment in g1CollectedHeap.hpp and |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3533 // G1CollectedHeap::ref_processing_init() to see how |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3534 // reference processing currently works in G1. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3535 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3536 // Enable discovery in the STW reference processor |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3537 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3538 true /*verify_no_refs*/); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3539 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3540 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3541 // We want to temporarily turn off discovery by the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3542 // CM ref processor, if necessary, and turn it back on |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3543 // on again later if we do. Using a scoped |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3544 // NoRefDiscovery object will do this. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3545 NoRefDiscovery no_cm_discovery(ref_processor_cm()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3546 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3547 // 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
|
3548 // of the collection set!). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3549 release_mutator_alloc_region(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3550 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3551 // We should call this after we retire the mutator alloc |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3552 // region(s) so that all the ALLOC / RETIRE events are generated |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3553 // before the start GC event. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3554 _hr_printer.start_gc(false /* full */, (size_t) total_collections()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3555 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3556 // The elapsed time induced by the start time below deliberately elides |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3557 // the possible verification above. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3558 double start_time_sec = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3559 size_t start_used_bytes = used(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3560 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3561 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3562 gclog_or_tty->print_cr("\nBefore recording pause start.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3563 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3564 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
|
3565 #endif // YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3566 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3567 g1_policy()->record_collection_pause_start(start_time_sec, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3568 start_used_bytes); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3569 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3570 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3571 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3572 _young_list->print(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3573 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3574 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3575 if (g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3576 concurrent_mark()->checkpointRootsInitialPre(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3577 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3578 perm_gen()->save_marks(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3579 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3580 // We must do this before any possible evacuation that should propagate |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3581 // marks. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3582 if (mark_in_progress()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3583 double start_time_sec = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3584 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3585 _cm->drainAllSATBBuffers(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3586 double finish_mark_ms = (os::elapsedTime() - start_time_sec) * 1000.0; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3587 g1_policy()->record_satb_drain_time(finish_mark_ms); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3588 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3589 // Record the number of elements currently on the mark stack, so we |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3590 // only iterate over these. (Since evacuation may add to the mark |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3591 // stack, doing more exposes race conditions.) If no mark is in |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3592 // progress, this will be zero. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3593 _cm->set_oops_do_bound(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3594 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3595 if (mark_in_progress()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3596 concurrent_mark()->newCSet(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3597 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3598 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3599 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3600 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3601 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3602 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
|
3603 #endif // YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3604 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3605 g1_policy()->choose_collection_set(target_pause_time_ms); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3606 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3607 if (_hr_printer.is_active()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3608 HeapRegion* hr = g1_policy()->collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3609 while (hr != NULL) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3610 G1HRPrinter::RegionType type; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3611 if (!hr->is_young()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3612 type = G1HRPrinter::Old; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3613 } else if (hr->is_survivor()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3614 type = G1HRPrinter::Survivor; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3615 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3616 type = G1HRPrinter::Eden; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3617 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3618 _hr_printer.cset(hr); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3619 hr = hr->next_in_collection_set(); |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3620 } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3621 } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3622 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3623 // We have chosen the complete collection set. If marking is |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3624 // active then, we clear the region fields of any of the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3625 // concurrent marking tasks whose region fields point into |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3626 // the collection set as these values will become stale. This |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3627 // will cause the owning marking threads to claim a new region |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3628 // when marking restarts. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3629 if (mark_in_progress()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3630 concurrent_mark()->reset_active_task_region_fields_in_cset(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3631 } |
|
3378
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3632 |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3633 #ifdef ASSERT |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3634 VerifyCSetClosure cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3635 collection_set_iterate(&cl); |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3636 #endif // ASSERT |
| 1707 | 3637 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3638 setup_surviving_young_words(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3639 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3640 // Initialize the GC alloc regions. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3641 init_gc_alloc_regions(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3642 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3643 // Actually do the work... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3644 evacuate_collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3645 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3646 free_collection_set(g1_policy()->collection_set()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3647 g1_policy()->clear_collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3648 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3649 cleanup_surviving_young_words(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3650 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3651 // Start a new incremental collection set for the next pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3652 g1_policy()->start_incremental_cset_building(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3653 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3654 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3655 // regions to the incremental collection set for the next |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3656 // evacuation pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3657 clear_cset_fast_test(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3658 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3659 _young_list->reset_sampled_info(); |
|
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 // Don't check the whole heap at this point as the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3662 // GC alloc regions from this pause have been tagged |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3663 // as survivors and moved on to the survivor list. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3664 // Survivor regions will fail the !is_young() check. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3665 assert(check_young_list_empty(false /* check_heap */), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3666 "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
|
3667 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3668 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3669 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3670 _young_list->print(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3671 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3672 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3673 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3674 _young_list->first_survivor_region(), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3675 _young_list->last_survivor_region()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3676 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3677 _young_list->reset_auxilary_lists(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3678 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3679 if (evacuation_failed()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3680 _summary_bytes_used = recalculate_used(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3681 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3682 // The "used" of the the collection set have already been subtracted |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3683 // when they were freed. Add in the bytes evacuated. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3684 _summary_bytes_used += g1_policy()->bytes_copied_during_gc(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3685 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3686 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3687 if (g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3688 concurrent_mark()->checkpointRootsInitialPost(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3689 set_marking_started(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3690 // CAUTION: after the doConcurrentMark() call below, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3691 // the concurrent marking thread(s) could be running |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3692 // concurrently with us. Make sure that anything after |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3693 // this point does not assume that we are the only GC thread |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3694 // running. Note: of course, the actual marking work will |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3695 // not start until the safepoint itself is released in |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3696 // ConcurrentGCThread::safepoint_desynchronize(). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3697 doConcurrentMark(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3698 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3699 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3700 allocate_dummy_regions(); |
|
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
3701 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3702 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3703 gclog_or_tty->print_cr("\nEnd of the pause.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3704 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3705 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
|
3706 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3707 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3708 init_mutator_alloc_region(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3709 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3710 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3711 size_t expand_bytes = g1_policy()->expansion_amount(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3712 if (expand_bytes > 0) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3713 size_t bytes_before = capacity(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3714 if (!expand(expand_bytes)) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3715 // We failed to expand the heap so let's verify that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3716 // committed/uncommitted amount match the backing store |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3717 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3718 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3719 } |
|
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3720 } |
|
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3721 } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3722 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3723 double end_time_sec = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3724 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3725 g1_policy()->record_pause_time_ms(pause_time_ms); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3726 int active_gc_threads = workers()->active_workers(); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3727 g1_policy()->record_collection_pause_end(active_gc_threads); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3728 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3729 MemoryService::track_memory_usage(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3730 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3731 // 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
|
3732 // update buffers to bring the RSets up-to-date if |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3733 // G1HRRSFlushLogBuffersOnVerify has been set. While scanning |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3734 // 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
|
3735 // regions we just allocated to (i.e., the GC alloc |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3736 // regions). However, during the last GC we called |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3737 // set_saved_mark() on all the GC alloc regions, so card |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3738 // scanning might skip the [saved_mark_word()...top()] area of |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3739 // those regions (i.e., the area we allocated objects into |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3740 // during the last GC). But it shouldn't. Given that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3741 // saved_mark_word() is conditional on whether the GC time stamp |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3742 // 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
|
3743 // 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
|
3744 // regions and saved_mark_word() will simply return top() for |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3745 // 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
|
3746 // than iterating over the regions and fixing them. In fact, the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3747 // GC time stamp increment here also ensures that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3748 // saved_mark_word() will return top() between pauses, i.e., |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3749 // during concurrent refinement. So we don't need the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3750 // is_gc_active() check to decided which top to use when |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3751 // scanning cards (see CR 7039627). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3752 increment_gc_time_stamp(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3753 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3754 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3755 HandleMark hm; // Discard invalid handles created during verification |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3756 gclog_or_tty->print(" VerifyAfterGC:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3757 prepare_for_verify(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3758 Universe::verify(/* allow dirty */ true, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3759 /* silent */ false, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3760 /* option */ VerifyOption_G1UsePrevMarking); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3761 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3762 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3763 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3764 ref_processor_stw()->verify_no_references_recorded(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3765 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3766 // 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
|
3767 } |
|
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3768 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3769 { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3770 size_t expand_bytes = g1_policy()->expansion_amount(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3771 if (expand_bytes > 0) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3772 size_t bytes_before = capacity(); |
|
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3886
diff
changeset
|
3773 // No need for an ergo verbose message here, |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3886
diff
changeset
|
3774 // expansion_amount() does this when it returns a value > 0. |
|
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3775 if (!expand(expand_bytes)) { |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3776 // We failed to expand the heap so let's verify that |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3777 // committed/uncommitted amount match the backing store |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3778 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3779 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3780 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3781 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3782 } |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3783 |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3784 // 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
|
3785 // 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
|
3786 // 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
|
3787 // RETIRE events are generated before the end GC event. |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3788 _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
|
3789 |
|
3764
053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
tonyp
parents:
3378
diff
changeset
|
3790 // 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
|
3791 g1_policy()->print_heap_transition(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3792 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3793 if (mark_in_progress()) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3794 concurrent_mark()->update_g1_committed(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3795 } |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3796 |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3797 #ifdef TRACESPINNING |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3798 ParallelTaskTerminator::print_termination_counts(); |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3799 #endif |
| 342 | 3800 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3801 gc_epilogue(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3802 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3803 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3804 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3805 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
|
3806 print_tracing_info(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3807 vm_exit(-1); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3808 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3809 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3810 |
| 3766 | 3811 _hrs.verify_optional(); |
| 2152 | 3812 verify_region_sets_optional(); |
| 3813 | |
| 1709 | 3814 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
| 3815 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); | |
| 3816 | |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3817 if (PrintHeapAtGC) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3818 Universe::print_heap_after_gc(); |
| 342 | 3819 } |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
3820 g1mm()->update_sizes(); |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3821 |
|
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3822 if (G1SummarizeRSetStats && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3823 (G1SummarizeRSetStatsPeriod > 0) && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3824 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3825 g1_rem_set()->print_summary_info(); |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3826 } |
| 1973 | 3827 |
| 3828 return true; | |
| 342 | 3829 } |
| 3830 | |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3831 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3832 { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3833 size_t gclab_word_size; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3834 switch (purpose) { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3835 case GCAllocForSurvived: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3836 gclab_word_size = YoungPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3837 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3838 case GCAllocForTenured: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3839 gclab_word_size = OldPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3840 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3841 default: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3842 assert(false, "unknown GCAllocPurpose"); |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3843 gclab_word_size = OldPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3844 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3845 } |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3846 return gclab_word_size; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3847 } |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3848 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3849 void G1CollectedHeap::init_mutator_alloc_region() { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3850 assert(_mutator_alloc_region.get() == NULL, "pre-condition"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3851 _mutator_alloc_region.init(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3852 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3853 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3854 void G1CollectedHeap::release_mutator_alloc_region() { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3855 _mutator_alloc_region.release(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3856 assert(_mutator_alloc_region.get() == NULL, "post-condition"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
3857 } |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3858 |
|
3830
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
changeset
|
3859 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
|
3860 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
|
3861 |
|
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
|
3862 _survivor_gc_alloc_region.init(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
changeset
|
3863 _old_gc_alloc_region.init(); |
|
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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changeset
|
3864 HeapRegion* retained_region = _retained_old_gc_alloc_region; |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
3865 _retained_old_gc_alloc_region = NULL; |
|
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
changeset
|
3866 |
|
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parents:
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diff
changeset
|
3867 // We will discard the current GC alloc region if: |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
changeset
|
3868 // a) it's in the collection set (it can happen!), |
|
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
|
3869 // b) it's already full (no point in using it), |
|
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
|
3870 // 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:
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diff
changeset
|
3871 // 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:
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diff
changeset
|
3872 // d) it's humongous (this means that it was emptied |
|
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
|
3873 // during a cleanup and was added to the free list, but |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
changeset
|
3874 // has been subseqently used to allocate a humongous |
|
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
|
3875 // object that may be less than the region size). |
|
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
changeset
|
3876 if (retained_region != NULL && |
|
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diff
changeset
|
3877 !retained_region->in_collection_set() && |
|
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parents:
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changeset
|
3878 !(retained_region->top() == retained_region->end()) && |
|
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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changeset
|
3879 !retained_region->is_empty() && |
|
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diff
changeset
|
3880 !retained_region->isHumongous()) { |
|
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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changeset
|
3881 retained_region->set_saved_mark(); |
| 4072 | 3882 // The retained region was added to the old region set when it was |
| 3883 // retired. We have to remove it now, since we don't allow regions | |
| 3884 // we allocate to in the region sets. We'll re-add it later, when | |
| 3885 // it's retired again. | |
| 3886 _old_set.remove(retained_region); | |
|
3830
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|
3887 _old_gc_alloc_region.set(retained_region); |
|
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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changeset
|
3888 _hr_printer.reuse(retained_region); |
| 342 | 3889 } |
| 3890 } | |
| 3891 | |
|
3830
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|
3892 void G1CollectedHeap::release_gc_alloc_regions() { |
|
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changeset
|
3893 _survivor_gc_alloc_region.release(); |
|
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parents:
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changeset
|
3894 // If we have an old GC alloc region to release, we'll save it in |
|
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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changeset
|
3895 // _retained_old_gc_alloc_region. If we don't |
|
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parents:
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changeset
|
3896 // _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
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parents:
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diff
changeset
|
3897 // want either way so no reason to check explicitly for either |
|
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parents:
3824
diff
changeset
|
3898 // condition. |
|
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changeset
|
3899 _retained_old_gc_alloc_region = _old_gc_alloc_region.release(); |
| 342 | 3900 } |
| 3901 | |
|
3830
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|
3902 void G1CollectedHeap::abandon_gc_alloc_regions() { |
|
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parents:
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diff
changeset
|
3903 assert(_survivor_gc_alloc_region.get() == NULL, "pre-condition"); |
|
f44782f04dd4
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diff
changeset
|
3904 assert(_old_gc_alloc_region.get() == NULL, "pre-condition"); |
|
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changeset
|
3905 _retained_old_gc_alloc_region = NULL; |
| 342 | 3906 } |
| 3907 | |
| 3908 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
| 3909 _drain_in_progress = false; | |
| 3910 set_evac_failure_closure(cl); | |
| 3911 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 3912 } | |
| 3913 | |
| 3914 void G1CollectedHeap::finalize_for_evac_failure() { | |
| 3915 assert(_evac_failure_scan_stack != NULL && | |
| 3916 _evac_failure_scan_stack->length() == 0, | |
| 3917 "Postcondition"); | |
| 3918 assert(!_drain_in_progress, "Postcondition"); | |
| 1045 | 3919 delete _evac_failure_scan_stack; |
| 342 | 3920 _evac_failure_scan_stack = NULL; |
| 3921 } | |
| 3922 | |
|
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
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diff
changeset
|
3923 class UpdateRSetDeferred : public OopsInHeapRegionClosure { |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3924 private: |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
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diff
changeset
|
3925 G1CollectedHeap* _g1; |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3926 DirtyCardQueue *_dcq; |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3927 CardTableModRefBS* _ct_bs; |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3928 |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3929 public: |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3930 UpdateRSetDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3931 _g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) {} |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3932 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3933 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3934 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3935 template <class T> void do_oop_work(T* p) { |
|
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3936 assert(_from->is_in_reserved(p), "paranoia"); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3937 if (!_from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3938 !_from->is_survivor()) { |
|
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3939 size_t card_index = _ct_bs->index_for(p); |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3940 if (_ct_bs->mark_card_deferred(card_index)) { |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3941 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3942 } |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3943 } |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3944 } |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3945 }; |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3946 |
| 342 | 3947 class RemoveSelfPointerClosure: public ObjectClosure { |
| 3948 private: | |
| 3949 G1CollectedHeap* _g1; | |
| 3950 ConcurrentMark* _cm; | |
| 3951 HeapRegion* _hr; | |
| 3952 size_t _prev_marked_bytes; | |
| 3953 size_t _next_marked_bytes; | |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3954 OopsInHeapRegionClosure *_cl; |
| 342 | 3955 public: |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3956 RemoveSelfPointerClosure(G1CollectedHeap* g1, HeapRegion* hr, |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3957 OopsInHeapRegionClosure* cl) : |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3958 _g1(g1), _hr(hr), _cm(_g1->concurrent_mark()), _prev_marked_bytes(0), |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3959 _next_marked_bytes(0), _cl(cl) {} |
| 342 | 3960 |
| 3961 size_t prev_marked_bytes() { return _prev_marked_bytes; } | |
| 3962 size_t next_marked_bytes() { return _next_marked_bytes; } | |
| 3963 | |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3964 // <original comment> |
|
352
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3965 // The original idea here was to coalesce evacuated and dead objects. |
|
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3966 // However that caused complications with the block offset table (BOT). |
|
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3967 // In particular if there were two TLABs, one of them partially refined. |
|
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3968 // |----- TLAB_1--------|----TLAB_2-~~~(partially refined part)~~~| |
|
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3969 // The BOT entries of the unrefined part of TLAB_2 point to the start |
|
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3970 // of TLAB_2. If the last object of the TLAB_1 and the first object |
|
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3971 // of TLAB_2 are coalesced, then the cards of the unrefined part |
|
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3972 // would point into middle of the filler object. |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3973 // The current approach is to not coalesce and leave the BOT contents intact. |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3974 // </original comment> |
|
352
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3975 // |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3976 // We now reset the BOT when we start the object iteration over the |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3977 // region and refine its entries for every object we come across. So |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3978 // the above comment is not really relevant and we should be able |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3979 // to coalesce dead objects if we want to. |
|
352
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3980 void do_object(oop obj) { |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3981 HeapWord* obj_addr = (HeapWord*) obj; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3982 assert(_hr->is_in(obj_addr), "sanity"); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3983 size_t obj_size = obj->size(); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3984 _hr->update_bot_for_object(obj_addr, obj_size); |
|
352
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3985 if (obj->is_forwarded() && obj->forwardee() == obj) { |
|
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3986 // The object failed to move. |
|
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3987 assert(!_g1->is_obj_dead(obj), "We should not be preserving dead objs."); |
|
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3988 _cm->markPrev(obj); |
|
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3989 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3990 _prev_marked_bytes += (obj_size * HeapWordSize); |
|
352
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3991 if (_g1->mark_in_progress() && !_g1->is_obj_ill(obj)) { |
|
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3992 _cm->markAndGrayObjectIfNecessary(obj); |
|
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3993 } |
|
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3994 obj->set_mark(markOopDesc::prototype()); |
|
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3995 // While we were processing RSet buffers during the |
|
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3996 // collection, we actually didn't scan any cards on the |
|
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3997 // collection set, since we didn't want to update remebered |
|
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3998 // sets with entries that point into the collection set, given |
|
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3999 // that live objects fromthe collection set are about to move |
|
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4000 // and such entries will be stale very soon. This change also |
|
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4001 // dealt with a reliability issue which involved scanning a |
|
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4002 // card in the collection set and coming across an array that |
|
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4003 // was being chunked and looking malformed. The problem is |
|
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4004 // that, if evacuation fails, we might have remembered set |
|
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4005 // entries missing given that we skipped cards on the |
|
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4006 // collection set. So, we'll recreate such entries now. |
|
616
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4007 obj->oop_iterate(_cl); |
|
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4008 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
|
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4009 } else { |
|
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4010 // The object has been either evacuated or is dead. Fill it with a |
|
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4011 // dummy object. |
|
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4012 MemRegion mr((HeapWord*)obj, obj_size); |
|
481
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4013 CollectedHeap::fill_with_object(mr); |
| 342 | 4014 _cm->clearRangeBothMaps(mr); |
| 4015 } | |
| 4016 } | |
| 4017 }; | |
| 4018 | |
| 4019 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
| 1705 | 4020 UpdateRSetImmediate immediate_update(_g1h->g1_rem_set()); |
|
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4021 DirtyCardQueue dcq(&_g1h->dirty_card_queue_set()); |
|
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4022 UpdateRSetDeferred deferred_update(_g1h, &dcq); |
|
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4023 OopsInHeapRegionClosure *cl; |
|
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4024 if (G1DeferredRSUpdate) { |
|
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|
4025 cl = &deferred_update; |
|
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|
4026 } else { |
|
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|
4027 cl = &immediate_update; |
|
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|
4028 } |
| 342 | 4029 HeapRegion* cur = g1_policy()->collection_set(); |
| 4030 while (cur != NULL) { | |
| 4031 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
|
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4032 assert(!cur->isHumongous(), "sanity"); |
|
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4033 |
| 342 | 4034 if (cur->evacuation_failed()) { |
| 4035 assert(cur->in_collection_set(), "bad CS"); | |
|
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4036 RemoveSelfPointerClosure rspc(_g1h, cur, cl); |
|
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4037 |
|
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4038 // In the common case we make sure that this is done when the |
|
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4039 // region is freed so that it is "ready-to-go" when it's |
|
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|
4040 // re-allocated. However, when evacuation failure happens, a |
|
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4041 // region will remain in the heap and might ultimately be added |
|
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|
4042 // to a CSet in the future. So we have to be careful here and |
|
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|
4043 // make sure the region's RSet is ready for parallel iteration |
|
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|
4044 // whenever this might be required in the future. |
|
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|
4045 cur->rem_set()->reset_for_par_iteration(); |
|
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|
4046 cur->reset_bot(); |
|
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|
4047 cl->set_region(cur); |
| 342 | 4048 cur->object_iterate(&rspc); |
| 4049 | |
| 4050 // A number of manipulations to make the TAMS be the current top, | |
| 4051 // and the marked bytes be the ones observed in the iteration. | |
| 4052 if (_g1h->concurrent_mark()->at_least_one_mark_complete()) { | |
| 4053 // The comments below are the postconditions achieved by the | |
| 4054 // calls. Note especially the last such condition, which says that | |
| 4055 // the count of marked bytes has been properly restored. | |
| 4056 cur->note_start_of_marking(false); | |
| 4057 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
| 4058 cur->add_to_marked_bytes(rspc.prev_marked_bytes()); | |
| 4059 // _next_marked_bytes == prev_marked_bytes. | |
| 4060 cur->note_end_of_marking(); | |
| 4061 // _prev_top_at_mark_start == top(), | |
| 4062 // _prev_marked_bytes == prev_marked_bytes | |
| 4063 } | |
| 4064 // If there is no mark in progress, we modified the _next variables | |
| 4065 // above needlessly, but harmlessly. | |
| 4066 if (_g1h->mark_in_progress()) { | |
| 4067 cur->note_start_of_marking(false); | |
| 4068 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
| 4069 // _next_marked_bytes == next_marked_bytes. | |
| 4070 } | |
| 4071 } | |
| 4072 cur = cur->next_in_collection_set(); | |
| 4073 } | |
| 4074 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
| 4075 | |
| 4076 // Now restore saved marks, if any. | |
| 4077 if (_objs_with_preserved_marks != NULL) { | |
| 4078 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
| 4079 guarantee(_objs_with_preserved_marks->length() == | |
| 4080 _preserved_marks_of_objs->length(), "Both or none."); | |
| 4081 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
| 4082 oop obj = _objs_with_preserved_marks->at(i); | |
| 4083 markOop m = _preserved_marks_of_objs->at(i); | |
| 4084 obj->set_mark(m); | |
| 4085 } | |
| 4086 // Delete the preserved marks growable arrays (allocated on the C heap). | |
| 4087 delete _objs_with_preserved_marks; | |
| 4088 delete _preserved_marks_of_objs; | |
| 4089 _objs_with_preserved_marks = NULL; | |
| 4090 _preserved_marks_of_objs = NULL; | |
| 4091 } | |
| 4092 } | |
| 4093 | |
| 4094 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
| 4095 _evac_failure_scan_stack->push(obj); | |
| 4096 } | |
| 4097 | |
| 4098 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
| 4099 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
| 4100 | |
| 4101 while (_evac_failure_scan_stack->length() > 0) { | |
| 4102 oop obj = _evac_failure_scan_stack->pop(); | |
| 4103 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
| 4104 obj->oop_iterate_backwards(_evac_failure_closure); | |
| 4105 } | |
| 4106 } | |
| 4107 | |
| 4108 oop | |
| 4109 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
|
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|
4110 oop old, |
|
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|
4111 bool should_mark_root) { |
|
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|
4112 assert(obj_in_cs(old), |
|
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|
4113 err_msg("obj: "PTR_FORMAT" should still be in the CSet", |
|
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|
4114 (HeapWord*) old)); |
| 342 | 4115 markOop m = old->mark(); |
| 4116 oop forward_ptr = old->forward_to_atomic(old); | |
| 4117 if (forward_ptr == NULL) { | |
| 4118 // Forward-to-self succeeded. | |
|
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|
4119 |
|
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|
4120 // should_mark_root will be true when this routine is called |
|
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|
4121 // from a root scanning closure during an initial mark pause. |
|
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|
4122 // In this case the thread that succeeds in self-forwarding the |
|
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|
4123 // object is also responsible for marking the object. |
|
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|
4124 if (should_mark_root) { |
|
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|
4125 assert(!oopDesc::is_null(old), "shouldn't be"); |
|
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|
4126 _cm->grayRoot(old); |
|
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|
4127 } |
|
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|
4128 |
| 342 | 4129 if (_evac_failure_closure != cl) { |
| 4130 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
| 4131 assert(!_drain_in_progress, | |
| 4132 "Should only be true while someone holds the lock."); | |
| 4133 // Set the global evac-failure closure to the current thread's. | |
| 4134 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
| 4135 set_evac_failure_closure(cl); | |
| 4136 // Now do the common part. | |
| 4137 handle_evacuation_failure_common(old, m); | |
| 4138 // Reset to NULL. | |
| 4139 set_evac_failure_closure(NULL); | |
| 4140 } else { | |
| 4141 // The lock is already held, and this is recursive. | |
| 4142 assert(_drain_in_progress, "This should only be the recursive case."); | |
| 4143 handle_evacuation_failure_common(old, m); | |
| 4144 } | |
| 4145 return old; | |
| 4146 } else { | |
|
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|
4147 // Forward-to-self failed. Either someone else managed to allocate |
|
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|
4148 // space for this object (old != forward_ptr) or they beat us in |
|
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|
4149 // self-forwarding it (old == forward_ptr). |
|
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|
4150 assert(old == forward_ptr || !obj_in_cs(forward_ptr), |
|
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|
4151 err_msg("obj: "PTR_FORMAT" forwarded to: "PTR_FORMAT" " |
|
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|
4152 "should not be in the CSet", |
|
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|
4153 (HeapWord*) old, (HeapWord*) forward_ptr)); |
| 342 | 4154 return forward_ptr; |
| 4155 } | |
| 4156 } | |
| 4157 | |
| 4158 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
| 4159 set_evacuation_failed(true); | |
| 4160 | |
| 4161 preserve_mark_if_necessary(old, m); | |
| 4162 | |
| 4163 HeapRegion* r = heap_region_containing(old); | |
| 4164 if (!r->evacuation_failed()) { | |
| 4165 r->set_evacuation_failed(true); | |
|
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|
4166 _hr_printer.evac_failure(r); |
| 342 | 4167 } |
| 4168 | |
| 4169 push_on_evac_failure_scan_stack(old); | |
| 4170 | |
| 4171 if (!_drain_in_progress) { | |
| 4172 // prevent recursion in copy_to_survivor_space() | |
| 4173 _drain_in_progress = true; | |
| 4174 drain_evac_failure_scan_stack(); | |
| 4175 _drain_in_progress = false; | |
| 4176 } | |
| 4177 } | |
| 4178 | |
| 4179 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
|
2038
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|
4180 assert(evacuation_failed(), "Oversaving!"); |
|
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|
4181 // We want to call the "for_promotion_failure" version only in the |
|
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|
4182 // case of a promotion failure. |
|
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|
4183 if (m->must_be_preserved_for_promotion_failure(obj)) { |
| 342 | 4184 if (_objs_with_preserved_marks == NULL) { |
| 4185 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
| 4186 _objs_with_preserved_marks = | |
| 4187 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 4188 _preserved_marks_of_objs = | |
| 4189 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
| 4190 } | |
| 4191 _objs_with_preserved_marks->push(obj); | |
| 4192 _preserved_marks_of_objs->push(m); | |
| 4193 } | |
| 4194 } | |
| 4195 | |
| 4196 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
| 4197 size_t word_size) { | |
|
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|
4198 if (purpose == GCAllocForSurvived) { |
|
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|
4199 HeapWord* result = survivor_attempt_allocation(word_size); |
|
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|
4200 if (result != NULL) { |
|
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changeset
|
4201 return result; |
| 342 | 4202 } else { |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4203 // 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
|
4204 // object there. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4205 return old_attempt_allocation(word_size); |
| 342 | 4206 } |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4207 } else { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4208 assert(purpose == GCAllocForTenured, "sanity"); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4209 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
|
4210 if (result != NULL) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4211 return result; |
| 342 | 4212 } else { |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4213 // 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
|
4214 // object there. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4215 return survivor_attempt_allocation(word_size); |
| 342 | 4216 } |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4217 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4218 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4219 ShouldNotReachHere(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4220 // 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
|
4221 return NULL; |
| 342 | 4222 } |
| 4223 | |
| 4224 #ifndef PRODUCT | |
| 4225 bool GCLabBitMapClosure::do_bit(size_t offset) { | |
| 4226 HeapWord* addr = _bitmap->offsetToHeapWord(offset); | |
| 4227 guarantee(_cm->isMarked(oop(addr)), "it should be!"); | |
| 4228 return true; | |
| 4229 } | |
| 4230 #endif // PRODUCT | |
| 4231 | |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4232 G1ParGCAllocBuffer::G1ParGCAllocBuffer(size_t gclab_word_size) : |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4233 ParGCAllocBuffer(gclab_word_size), |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4234 _should_mark_objects(false), |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4235 _bitmap(G1CollectedHeap::heap()->reserved_region().start(), gclab_word_size), |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4236 _retired(false) |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4237 { |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4238 //_should_mark_objects is set to true when G1ParCopyHelper needs to |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4239 // mark the forwarded location of an evacuated object. |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4240 // We set _should_mark_objects to true if marking is active, i.e. when we |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4241 // need to propagate a mark, or during an initial mark pause, i.e. when we |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4242 // need to mark objects immediately reachable by the roots. |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4243 if (G1CollectedHeap::heap()->mark_in_progress() || |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4244 G1CollectedHeap::heap()->g1_policy()->during_initial_mark_pause()) { |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4245 _should_mark_objects = true; |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4246 } |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4247 } |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4248 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4249 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4250 : _g1h(g1h), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4251 _refs(g1h->task_queue(queue_num)), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4252 _dcq(&g1h->dirty_card_queue_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4253 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4254 _g1_rem(g1h->g1_rem_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4255 _hash_seed(17), _queue_num(queue_num), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4256 _term_attempts(0), |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4257 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4258 _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
|
4259 _age_table(false), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4260 _strong_roots_time(0), _term_time(0), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4261 _alloc_buffer_waste(0), _undo_waste(0) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4262 { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4263 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4264 // 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
|
4265 // non-young regions (where the age is -1) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4266 // 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
|
4267 // 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
|
4268 size_t real_length = 1 + _g1h->g1_policy()->young_cset_region_length(); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4269 size_t array_length = PADDING_ELEM_NUM + |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4270 real_length + |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4271 PADDING_ELEM_NUM; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4272 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4273 if (_surviving_young_words_base == NULL) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4274 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
|
4275 "Not enough space for young surv histo."); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4276 _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
|
4277 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
|
4278 |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4279 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4280 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4281 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4282 _start = os::elapsedTime(); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4283 } |
| 342 | 4284 |
| 1709 | 4285 void |
| 4286 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
| 4287 { | |
| 4288 st->print_raw_cr("GC Termination Stats"); | |
| 4289 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
| 4290 " ------waste (KiB)------"); | |
| 4291 st->print_raw_cr("thr ms ms % ms % attempts" | |
| 4292 " total alloc undo"); | |
| 4293 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
| 4294 " ------- ------- -------"); | |
| 4295 } | |
| 4296 | |
| 4297 void | |
| 4298 G1ParScanThreadState::print_termination_stats(int i, | |
| 4299 outputStream* const st) const | |
| 4300 { | |
| 4301 const double elapsed_ms = elapsed_time() * 1000.0; | |
| 4302 const double s_roots_ms = strong_roots_time() * 1000.0; | |
| 4303 const double term_ms = term_time() * 1000.0; | |
| 4304 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
| 4305 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
| 4306 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
| 4307 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
| 4308 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
| 4309 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
| 4310 alloc_buffer_waste() * HeapWordSize / K, | |
| 4311 undo_waste() * HeapWordSize / K); | |
| 4312 } | |
| 4313 | |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4314 #ifdef ASSERT |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4315 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4316 assert(ref != NULL, "invariant"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4317 assert(UseCompressedOops, "sanity"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4318 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4319 oop p = oopDesc::load_decode_heap_oop(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4320 assert(_g1h->is_in_g1_reserved(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4321 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4322 return true; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4323 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4324 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4325 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4326 assert(ref != NULL, "invariant"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4327 if (has_partial_array_mask(ref)) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4328 // Must be in the collection set--it's already been copied. |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4329 oop p = clear_partial_array_mask(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4330 assert(_g1h->obj_in_cs(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4331 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4332 } else { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4333 oop p = oopDesc::load_decode_heap_oop(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4334 assert(_g1h->is_in_g1_reserved(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4335 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4336 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4337 return true; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4338 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4339 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4340 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4341 if (ref.is_narrow()) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4342 return verify_ref((narrowOop*) ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4343 } else { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4344 return verify_ref((oop*) ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4345 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4346 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4347 #endif // ASSERT |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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|
4348 |
|
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4349 void G1ParScanThreadState::trim_queue() { |
|
3979
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6484982: G1: process references during evacuation pauses
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changeset
|
4350 assert(_evac_cl != NULL, "not set"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4351 assert(_evac_failure_cl != NULL, "not set"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4352 assert(_partial_scan_cl != NULL, "not set"); |
|
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6484982: G1: process references during evacuation pauses
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|
4353 |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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diff
changeset
|
4354 StarTask ref; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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diff
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|
4355 do { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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diff
changeset
|
4356 // Drain the overflow stack first, so other threads can steal. |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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diff
changeset
|
4357 while (refs()->pop_overflow(ref)) { |
|
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6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
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diff
changeset
|
4358 deal_with_reference(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
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diff
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|
4359 } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4360 |
|
1862
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6989448: G1: refactor and simplify G1ParScanThreadState
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diff
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|
4361 while (refs()->pop_local(ref)) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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diff
changeset
|
4362 deal_with_reference(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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|
4363 } |
|
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changeset
|
4364 } while (!refs()->is_empty()); |
|
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4365 } |
|
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|
4366 |
| 342 | 4367 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : |
| 4368 _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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|
4369 _par_scan_state(par_scan_state), |
|
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7080389: G1: refactor marking code in evacuation pause copy closures
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|
4370 _during_initial_mark(_g1->g1_policy()->during_initial_mark_pause()), |
|
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7080389: G1: refactor marking code in evacuation pause copy closures
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|
4371 _mark_in_progress(_g1->mark_in_progress()) { } |
|
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7080389: G1: refactor marking code in evacuation pause copy closures
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|
4372 |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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|
4373 template <class T> void G1ParCopyHelper::mark_object(T* p) { |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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|
4374 // This is called from do_oop_work for objects that are not |
|
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7080389: G1: refactor marking code in evacuation pause copy closures
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|
4375 // in the collection set. Objects in the collection set |
|
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7080389: G1: refactor marking code in evacuation pause copy closures
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|
4376 // are marked after they have been evacuated. |
| 342 | 4377 |
|
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
4378 T heap_oop = oopDesc::load_heap_oop(p); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
4379 if (!oopDesc::is_null(heap_oop)) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
4380 oop obj = oopDesc::decode_heap_oop(heap_oop); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
4381 HeapWord* addr = (HeapWord*)obj; |
|
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4382 if (_g1->is_in_g1_reserved(addr)) { |
| 342 | 4383 _cm->grayRoot(oop(addr)); |
|
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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changeset
|
4384 } |
| 342 | 4385 } |
| 4386 } | |
| 4387 | |
|
3973
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7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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|
4388 oop G1ParCopyHelper::copy_to_survivor_space(oop old, bool should_mark_root, |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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|
4389 bool should_mark_copy) { |
| 342 | 4390 size_t word_sz = old->size(); |
| 4391 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
| 4392 // +1 to make the -1 indexes valid... | |
| 4393 int young_index = from_region->young_index_in_cset()+1; | |
| 4394 assert( (from_region->is_young() && young_index > 0) || | |
| 4395 (!from_region->is_young() && young_index == 0), "invariant" ); | |
| 4396 G1CollectorPolicy* g1p = _g1->g1_policy(); | |
| 4397 markOop m = old->mark(); | |
| 545 | 4398 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
| 4399 : m->age(); | |
| 4400 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
| 342 | 4401 word_sz); |
| 4402 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
| 4403 oop obj = oop(obj_ptr); | |
| 4404 | |
| 4405 if (obj_ptr == NULL) { | |
| 4406 // This will either forward-to-self, or detect that someone else has | |
| 4407 // installed a forwarding pointer. | |
| 4408 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
|
3973
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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parents:
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diff
changeset
|
4409 return _g1->handle_evacuation_failure_par(cl, old, should_mark_root); |
| 342 | 4410 } |
| 4411 | |
| 526 | 4412 // We're going to allocate linearly, so might as well prefetch ahead. |
| 4413 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
| 4414 | |
| 342 | 4415 oop forward_ptr = old->forward_to_atomic(obj); |
| 4416 if (forward_ptr == NULL) { | |
| 4417 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
| 526 | 4418 if (g1p->track_object_age(alloc_purpose)) { |
| 4419 // We could simply do obj->incr_age(). However, this causes a | |
| 4420 // performance issue. obj->incr_age() will first check whether | |
| 4421 // the object has a displaced mark by checking its mark word; | |
| 4422 // getting the mark word from the new location of the object | |
| 4423 // stalls. So, given that we already have the mark word and we | |
| 4424 // are about to install it anyway, it's better to increase the | |
| 4425 // age on the mark word, when the object does not have a | |
| 4426 // displaced mark word. We're not expecting many objects to have | |
| 4427 // a displaced marked word, so that case is not optimized | |
| 4428 // further (it could be...) and we simply call obj->incr_age(). | |
| 4429 | |
| 4430 if (m->has_displaced_mark_helper()) { | |
| 4431 // in this case, we have to install the mark word first, | |
| 4432 // otherwise obj looks to be forwarded (the old mark word, | |
| 4433 // which contains the forward pointer, was copied) | |
| 4434 obj->set_mark(m); | |
| 4435 obj->incr_age(); | |
| 4436 } else { | |
| 4437 m = m->incr_age(); | |
| 545 | 4438 obj->set_mark(m); |
| 526 | 4439 } |
| 545 | 4440 _par_scan_state->age_table()->add(obj, word_sz); |
| 4441 } else { | |
| 4442 obj->set_mark(m); | |
| 526 | 4443 } |
| 4444 | |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4445 // Mark the evacuated object or propagate "next" mark bit |
|
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changeset
|
4446 if (should_mark_copy) { |
| 342 | 4447 if (!use_local_bitmaps || |
| 4448 !_par_scan_state->alloc_buffer(alloc_purpose)->mark(obj_ptr)) { | |
| 4449 // if we couldn't mark it on the local bitmap (this happens when | |
| 4450 // the object was not allocated in the GCLab), we have to bite | |
| 4451 // the bullet and do the standard parallel mark | |
| 4452 _cm->markAndGrayObjectIfNecessary(obj); | |
| 4453 } | |
|
3886
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7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4454 |
| 342 | 4455 if (_g1->isMarkedNext(old)) { |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4456 // Unmark the object's old location so that marking |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4457 // doesn't think the old object is alive. |
| 342 | 4458 _cm->nextMarkBitMap()->parClear((HeapWord*)old); |
| 4459 } | |
| 4460 } | |
| 4461 | |
| 4462 size_t* surv_young_words = _par_scan_state->surviving_young_words(); | |
| 4463 surv_young_words[young_index] += word_sz; | |
| 4464 | |
| 4465 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
| 4466 arrayOop(old)->set_length(0); | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
4467 oop* old_p = set_partial_array_mask(old); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
4468 _par_scan_state->push_on_queue(old_p); |
| 342 | 4469 } else { |
| 526 | 4470 // No point in using the slower heap_region_containing() method, |
| 4471 // given that we know obj is in the heap. | |
| 4472 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
| 342 | 4473 obj->oop_iterate_backwards(_scanner); |
| 4474 } | |
| 4475 } else { | |
| 4476 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
| 4477 obj = forward_ptr; | |
| 4478 } | |
| 4479 return obj; | |
| 4480 } | |
| 4481 | |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4482 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
|
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
4483 template <class T> |
|
3886
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7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4484 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> |
|
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
4485 ::do_oop_work(T* p) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
4486 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 4487 assert(barrier != G1BarrierRS || obj != NULL, |
| 4488 "Precondition: G1BarrierRS implies obj is nonNull"); | |
| 4489 | |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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parents:
3869
diff
changeset
|
4490 // Marking: |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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parents:
3869
diff
changeset
|
4491 // If the object is in the collection set, then the thread |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4492 // that copies the object should mark, or propagate the |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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3869
diff
changeset
|
4493 // mark to, the evacuated object. |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
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diff
changeset
|
4494 // If the object is not in the collection set then we |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
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diff
changeset
|
4495 // should call the mark_object() method depending on the |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4496 // value of the template parameter do_mark_object (which will |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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3869
diff
changeset
|
4497 // be true for root scanning closures during an initial mark |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4498 // pause). |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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3869
diff
changeset
|
4499 // The mark_object() method first checks whether the object |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4500 // is marked and, if not, attempts to mark the object. |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4501 |
| 526 | 4502 // here the null check is implicit in the cset_fast_test() test |
|
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
4503 if (_g1->in_cset_fast_test(obj)) { |
| 526 | 4504 if (obj->is_forwarded()) { |
|
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
4505 oopDesc::encode_store_heap_oop(p, obj->forwardee()); |
|
3886
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diff
changeset
|
4506 // If we are a root scanning closure during an initial |
|
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diff
changeset
|
4507 // mark pause (i.e. do_mark_object will be true) then |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4508 // we also need to handle marking of roots in the |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4509 // event of an evacuation failure. In the event of an |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4510 // evacuation failure, the object is forwarded to itself |
|
3973
663cb89032b1
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3920
diff
changeset
|
4511 // and not copied. For root-scanning closures, the |
|
663cb89032b1
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diff
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|
4512 // object would be marked after a successful self-forward |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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diff
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|
4513 // but an object could be pointed to by both a root and non |
|
663cb89032b1
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diff
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|
4514 // root location and be self-forwarded by a non-root-scanning |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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|
4515 // closure. Therefore we also have to attempt to mark the |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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diff
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|
4516 // self-forwarded root object here. |
|
3886
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diff
changeset
|
4517 if (do_mark_object && obj->forwardee() == obj) { |
|
eeae91c9baba
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diff
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|
4518 mark_object(p); |
|
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changeset
|
4519 } |
| 526 | 4520 } else { |
|
3973
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changeset
|
4521 // During an initial mark pause, objects that are pointed to |
|
663cb89032b1
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diff
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|
4522 // by the roots need to be marked - even in the event of an |
|
663cb89032b1
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|
4523 // evacuation failure. We pass the template parameter |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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diff
changeset
|
4524 // do_mark_object (which is true for root scanning closures |
|
663cb89032b1
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diff
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|
4525 // during an initial mark pause) to copy_to_survivor_space |
|
663cb89032b1
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|
4526 // which will pass it on to the evacuation failure handling |
|
663cb89032b1
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|
4527 // code. The thread that successfully self-forwards a root |
|
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|
4528 // object to itself is responsible for marking the object. |
|
663cb89032b1
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diff
changeset
|
4529 bool should_mark_root = do_mark_object; |
|
663cb89032b1
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|
4530 |
|
3886
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changeset
|
4531 // We need to mark the copied object if we're a root scanning |
|
eeae91c9baba
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diff
changeset
|
4532 // closure during an initial mark pause (i.e. do_mark_object |
|
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diff
changeset
|
4533 // will be true), or the object is already marked and we need |
|
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changeset
|
4534 // to propagate the mark to the evacuated copy. |
|
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|
4535 bool should_mark_copy = do_mark_object || |
|
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|
4536 _during_initial_mark || |
|
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|
4537 (_mark_in_progress && !_g1->is_obj_ill(obj)); |
|
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4538 |
|
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|
4539 oop copy_oop = copy_to_survivor_space(obj, should_mark_root, |
|
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|
4540 should_mark_copy); |
|
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|
4541 oopDesc::encode_store_heap_oop(p, copy_oop); |
| 342 | 4542 } |
| 526 | 4543 // When scanning the RS, we only care about objs in CS. |
| 4544 if (barrier == G1BarrierRS) { | |
|
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4545 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 342 | 4546 } |
|
3886
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|
4547 } else { |
|
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|
4548 // The object is not in collection set. If we're a root scanning |
|
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|
4549 // closure during an initial mark pause (i.e. do_mark_object will |
|
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|
4550 // be true) then attempt to mark the object. |
|
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|
4551 if (do_mark_object) { |
|
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|
4552 mark_object(p); |
|
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|
4553 } |
| 526 | 4554 } |
| 4555 | |
| 4556 if (barrier == G1BarrierEvac && obj != NULL) { | |
|
616
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|
4557 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 526 | 4558 } |
| 4559 | |
| 4560 if (do_gen_barrier && obj != NULL) { | |
| 4561 par_do_barrier(p); | |
| 4562 } | |
| 4563 } | |
| 4564 | |
|
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|
4565 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
|
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|
4566 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
|
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|
4567 |
|
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|
4568 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
| 526 | 4569 assert(has_partial_array_mask(p), "invariant"); |
| 4570 oop old = clear_partial_array_mask(p); | |
| 342 | 4571 assert(old->is_objArray(), "must be obj array"); |
| 4572 assert(old->is_forwarded(), "must be forwarded"); | |
| 4573 assert(Universe::heap()->is_in_reserved(old), "must be in heap."); | |
| 4574 | |
| 4575 objArrayOop obj = objArrayOop(old->forwardee()); | |
| 4576 assert((void*)old != (void*)old->forwardee(), "self forwarding here?"); | |
| 4577 // Process ParGCArrayScanChunk elements now | |
| 4578 // and push the remainder back onto queue | |
| 4579 int start = arrayOop(old)->length(); | |
| 4580 int end = obj->length(); | |
| 4581 int remainder = end - start; | |
| 4582 assert(start <= end, "just checking"); | |
| 4583 if (remainder > 2 * ParGCArrayScanChunk) { | |
| 4584 // Test above combines last partial chunk with a full chunk | |
| 4585 end = start + ParGCArrayScanChunk; | |
| 4586 arrayOop(old)->set_length(end); | |
| 4587 // Push remainder. | |
|
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|
4588 oop* old_p = set_partial_array_mask(old); |
|
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|
4589 assert(arrayOop(old)->length() < obj->length(), "Empty push?"); |
|
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|
4590 _par_scan_state->push_on_queue(old_p); |
| 342 | 4591 } else { |
| 4592 // Restore length so that the heap remains parsable in | |
| 4593 // case of evacuation failure. | |
| 4594 arrayOop(old)->set_length(end); | |
| 4595 } | |
|
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|
4596 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
| 342 | 4597 // process our set of indices (include header in first chunk) |
|
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|
4598 obj->oop_iterate_range(&_scanner, start, end); |
| 342 | 4599 } |
| 4600 | |
| 4601 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
| 4602 protected: | |
| 4603 G1CollectedHeap* _g1h; | |
| 4604 G1ParScanThreadState* _par_scan_state; | |
| 4605 RefToScanQueueSet* _queues; | |
| 4606 ParallelTaskTerminator* _terminator; | |
| 4607 | |
| 4608 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
| 4609 RefToScanQueueSet* queues() { return _queues; } | |
| 4610 ParallelTaskTerminator* terminator() { return _terminator; } | |
| 4611 | |
| 4612 public: | |
| 4613 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
| 4614 G1ParScanThreadState* par_scan_state, | |
| 4615 RefToScanQueueSet* queues, | |
| 4616 ParallelTaskTerminator* terminator) | |
| 4617 : _g1h(g1h), _par_scan_state(par_scan_state), | |
| 4618 _queues(queues), _terminator(terminator) {} | |
| 4619 | |
|
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|
4620 void do_void(); |
|
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|
4621 |
|
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|
4622 private: |
|
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|
4623 inline bool offer_termination(); |
|
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|
4624 }; |
|
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|
4625 |
|
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|
4626 bool G1ParEvacuateFollowersClosure::offer_termination() { |
|
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|
4627 G1ParScanThreadState* const pss = par_scan_state(); |
|
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|
4628 pss->start_term_time(); |
|
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|
4629 const bool res = terminator()->offer_termination(); |
|
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|
4630 pss->end_term_time(); |
|
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|
4631 return res; |
|
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|
4632 } |
|
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|
4633 |
|
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|
4634 void G1ParEvacuateFollowersClosure::do_void() { |
|
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|
4635 StarTask stolen_task; |
|
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|
4636 G1ParScanThreadState* const pss = par_scan_state(); |
|
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|
4637 pss->trim_queue(); |
|
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|
4638 |
|
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|
4639 do { |
|
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|
4640 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
|
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|
4641 assert(pss->verify_task(stolen_task), "sanity"); |
|
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|
4642 if (stolen_task.is_narrow()) { |
|
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|
4643 pss->deal_with_reference((narrowOop*) stolen_task); |
|
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|
4644 } else { |
|
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|
4645 pss->deal_with_reference((oop*) stolen_task); |
|
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|
4646 } |
|
1883
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|
4647 |
|
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changeset
|
4648 // We've just processed a reference and we might have made |
|
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|
4649 // available new entries on the queues. So we have to make sure |
|
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|
4650 // we drain the queues as necessary. |
| 342 | 4651 pss->trim_queue(); |
| 4652 } | |
|
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|
4653 } while (!offer_termination()); |
|
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|
4654 |
|
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changeset
|
4655 pss->retire_alloc_buffers(); |
|
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|
4656 } |
| 342 | 4657 |
| 4658 class G1ParTask : public AbstractGangTask { | |
| 4659 protected: | |
| 4660 G1CollectedHeap* _g1h; | |
| 4661 RefToScanQueueSet *_queues; | |
| 4662 ParallelTaskTerminator _terminator; | |
|
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|
4663 int _n_workers; |
| 342 | 4664 |
| 4665 Mutex _stats_lock; | |
| 4666 Mutex* stats_lock() { return &_stats_lock; } | |
| 4667 | |
| 4668 size_t getNCards() { | |
| 4669 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
| 4670 / G1BlockOffsetSharedArray::N_bytes; | |
| 4671 } | |
| 4672 | |
| 4673 public: | |
|
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|
4674 G1ParTask(G1CollectedHeap* g1h, |
|
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changeset
|
4675 RefToScanQueueSet *task_queues) |
| 342 | 4676 : AbstractGangTask("G1 collection"), |
| 4677 _g1h(g1h), | |
| 4678 _queues(task_queues), | |
|
4095
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|
4679 _terminator(0, _queues), |
|
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changeset
|
4680 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true) |
| 342 | 4681 {} |
| 4682 | |
| 4683 RefToScanQueueSet* queues() { return _queues; } | |
| 4684 | |
| 4685 RefToScanQueue *work_queue(int i) { | |
| 4686 return queues()->queue(i); | |
| 4687 } | |
| 4688 | |
|
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|
4689 ParallelTaskTerminator* terminator() { return &_terminator; } |
|
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|
4690 |
|
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|
4691 virtual void set_for_termination(int active_workers) { |
|
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|
4692 // This task calls set_n_termination() in par_non_clean_card_iterate_work() |
|
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|
4693 // in the young space (_par_seq_tasks) in the G1 heap |
|
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|
4694 // for SequentialSubTasksDone. |
|
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|
4695 // This task also uses SubTasksDone in SharedHeap and G1CollectedHeap |
|
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|
4696 // both of which need setting by set_n_termination(). |
|
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|
4697 _g1h->SharedHeap::set_n_termination(active_workers); |
|
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|
4698 _g1h->set_n_termination(active_workers); |
|
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|
4699 terminator()->reset_for_reuse(active_workers); |
|
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|
4700 _n_workers = active_workers; |
|
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|
4701 } |
|
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|
4702 |
| 342 | 4703 void work(int i) { |
|
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|
4704 if (i >= _n_workers) return; // no work needed this round |
| 1611 | 4705 |
| 4706 double start_time_ms = os::elapsedTime() * 1000.0; | |
| 4707 _g1h->g1_policy()->record_gc_worker_start_time(i, start_time_ms); | |
| 4708 | |
| 342 | 4709 ResourceMark rm; |
| 4710 HandleMark hm; | |
| 4711 | |
|
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|
4712 ReferenceProcessor* rp = _g1h->ref_processor_stw(); |
|
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|
4713 |
| 526 | 4714 G1ParScanThreadState pss(_g1h, i); |
|
3979
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|
4715 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, rp); |
|
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|
4716 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, rp); |
|
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|
4717 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, rp); |
| 342 | 4718 |
| 4719 pss.set_evac_closure(&scan_evac_cl); | |
| 4720 pss.set_evac_failure_closure(&evac_failure_cl); | |
| 4721 pss.set_partial_scan_closure(&partial_scan_cl); | |
| 4722 | |
|
3979
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|
4723 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss, rp); |
|
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|
4724 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss, rp); |
|
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|
4725 |
|
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|
4726 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss, rp); |
|
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|
4727 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss, rp); |
|
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|
4728 |
|
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|
4729 OopClosure* scan_root_cl = &only_scan_root_cl; |
|
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|
4730 OopsInHeapRegionClosure* scan_perm_cl = &only_scan_perm_cl; |
| 342 | 4731 |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
4732 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
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|
4733 // We also need to mark copied objects. |
| 342 | 4734 scan_root_cl = &scan_mark_root_cl; |
| 4735 scan_perm_cl = &scan_mark_perm_cl; | |
| 4736 } | |
| 4737 | |
|
3983
811ec3d0833b
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|
4738 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
|
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|
4739 |
| 342 | 4740 pss.start_strong_roots(); |
| 4741 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
| 4742 SharedHeap::SO_AllClasses, | |
| 4743 scan_root_cl, | |
|
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|
4744 &push_heap_rs_cl, |
| 342 | 4745 scan_perm_cl, |
| 4746 i); | |
| 4747 pss.end_strong_roots(); | |
|
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|
4748 |
| 342 | 4749 { |
| 4750 double start = os::elapsedTime(); | |
| 4751 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
| 4752 evac.do_void(); | |
| 4753 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
| 4754 double term_ms = pss.term_time()*1000.0; | |
| 4755 _g1h->g1_policy()->record_obj_copy_time(i, elapsed_ms-term_ms); | |
| 1611 | 4756 _g1h->g1_policy()->record_termination(i, term_ms, pss.term_attempts()); |
| 342 | 4757 } |
| 1282 | 4758 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
| 342 | 4759 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
| 4760 | |
| 4761 // Clean up any par-expanded rem sets. | |
| 4762 HeapRegionRemSet::par_cleanup(); | |
| 4763 | |
| 4764 if (ParallelGCVerbose) { | |
| 1709 | 4765 MutexLocker x(stats_lock()); |
| 4766 pss.print_termination_stats(i); | |
| 342 | 4767 } |
| 4768 | |
|
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|
4769 assert(pss.refs()->is_empty(), "should be empty"); |
| 1611 | 4770 double end_time_ms = os::elapsedTime() * 1000.0; |
| 4771 _g1h->g1_policy()->record_gc_worker_end_time(i, end_time_ms); | |
| 342 | 4772 } |
| 4773 }; | |
| 4774 | |
| 4775 // *** Common G1 Evacuation Stuff | |
| 4776 | |
|
1833
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|
4777 // This method is run in a GC worker. |
|
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|
4778 |
| 342 | 4779 void |
| 4780 G1CollectedHeap:: | |
| 4781 g1_process_strong_roots(bool collecting_perm_gen, | |
| 4782 SharedHeap::ScanningOption so, | |
| 4783 OopClosure* scan_non_heap_roots, | |
| 4784 OopsInHeapRegionClosure* scan_rs, | |
| 4785 OopsInGenClosure* scan_perm, | |
| 4786 int worker_i) { | |
|
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|
4787 |
| 342 | 4788 // First scan the strong roots, including the perm gen. |
| 4789 double ext_roots_start = os::elapsedTime(); | |
| 4790 double closure_app_time_sec = 0.0; | |
| 4791 | |
| 4792 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
| 4793 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
| 4794 buf_scan_perm.set_generation(perm_gen()); | |
| 4795 | |
|
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|
4796 // Walk the code cache w/o buffering, because StarTask cannot handle |
|
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|
4797 // unaligned oop locations. |
|
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changeset
|
4798 CodeBlobToOopClosure eager_scan_code_roots(scan_non_heap_roots, /*do_marking=*/ true); |
|
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|
4799 |
|
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|
4800 process_strong_roots(false, // no scoping; this is parallel code |
|
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|
4801 collecting_perm_gen, so, |
| 342 | 4802 &buf_scan_non_heap_roots, |
|
989
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|
4803 &eager_scan_code_roots, |
| 342 | 4804 &buf_scan_perm); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
4805 |
|
3979
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|
4806 // Now the CM ref_processor roots. |
|
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|
4807 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { |
|
3979
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|
4808 // We need to treat the discovered reference lists of the |
|
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|
4809 // concurrent mark ref processor as roots and keep entries |
|
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|
4810 // (which are added by the marking threads) on them live |
|
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|
4811 // until they can be processed at the end of marking. |
|
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|
4812 ref_processor_cm()->weak_oops_do(&buf_scan_non_heap_roots); |
|
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|
4813 } |
|
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|
4814 |
|
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|
4815 // Finish up any enqueued closure apps (attributed as object copy time). |
| 342 | 4816 buf_scan_non_heap_roots.done(); |
| 4817 buf_scan_perm.done(); | |
|
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|
4818 |
| 342 | 4819 double ext_roots_end = os::elapsedTime(); |
|
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|
4820 |
| 342 | 4821 g1_policy()->reset_obj_copy_time(worker_i); |
|
3823
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|
4822 double obj_copy_time_sec = buf_scan_perm.closure_app_seconds() + |
|
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changeset
|
4823 buf_scan_non_heap_roots.closure_app_seconds(); |
| 342 | 4824 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); |
|
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|
4825 |
| 342 | 4826 double ext_root_time_ms = |
| 4827 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
|
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|
4828 |
| 342 | 4829 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); |
| 4830 | |
| 4831 // Scan strong roots in mark stack. | |
| 4832 if (!_process_strong_tasks->is_task_claimed(G1H_PS_mark_stack_oops_do)) { | |
| 4833 concurrent_mark()->oops_do(scan_non_heap_roots); | |
| 4834 } | |
| 4835 double mark_stack_scan_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; | |
| 4836 g1_policy()->record_mark_stack_scan_time(worker_i, mark_stack_scan_ms); | |
| 4837 | |
| 4838 // Now scan the complement of the collection set. | |
| 4839 if (scan_rs != NULL) { | |
| 4840 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
| 4841 } | |
|
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|
4842 |
| 342 | 4843 _process_strong_tasks->all_tasks_completed(); |
| 4844 } | |
| 4845 | |
| 4846 void | |
| 4847 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
| 4848 OopClosure* non_root_closure) { | |
|
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diff
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|
4849 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
|
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|
4850 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
| 342 | 4851 } |
| 4852 | |
|
3979
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|
4853 // Weak Reference Processing support |
|
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|
4854 |
|
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|
4855 // An always "is_alive" closure that is used to preserve referents. |
|
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|
4856 // If the object is non-null then it's alive. Used in the preservation |
|
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diff
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|
4857 // of referent objects that are pointed to by reference objects |
|
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|
4858 // discovered by the CM ref processor. |
|
4dfb2df418f2
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changeset
|
4859 class G1AlwaysAliveClosure: public BoolObjectClosure { |
|
4dfb2df418f2
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|
4860 G1CollectedHeap* _g1; |
|
4dfb2df418f2
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|
4861 public: |
|
4dfb2df418f2
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changeset
|
4862 G1AlwaysAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
|
4dfb2df418f2
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changeset
|
4863 void do_object(oop p) { assert(false, "Do not call."); } |
|
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|
4864 bool do_object_b(oop p) { |
|
4dfb2df418f2
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diff
changeset
|
4865 if (p != NULL) { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4866 return true; |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4867 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
4868 return false; |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4869 } |
|
4dfb2df418f2
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|
4870 }; |
|
4dfb2df418f2
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changeset
|
4871 |
|
4dfb2df418f2
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changeset
|
4872 bool G1STWIsAliveClosure::do_object_b(oop p) { |
|
4dfb2df418f2
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|
4873 // An object is reachable if it is outside the collection set, |
|
4dfb2df418f2
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|
4874 // or is inside and copied. |
|
4dfb2df418f2
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changeset
|
4875 return !_g1->obj_in_cs(p) || p->is_forwarded(); |
|
4dfb2df418f2
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|
4876 } |
|
4dfb2df418f2
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changeset
|
4877 |
|
4dfb2df418f2
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changeset
|
4878 // Non Copying Keep Alive closure |
|
4dfb2df418f2
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changeset
|
4879 class G1KeepAliveClosure: public OopClosure { |
|
4dfb2df418f2
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|
4880 G1CollectedHeap* _g1; |
|
4dfb2df418f2
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|
4881 public: |
|
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|
4882 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
|
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|
4883 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
|
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|
4884 void do_oop( oop* p) { |
|
4dfb2df418f2
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changeset
|
4885 oop obj = *p; |
|
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|
4886 |
|
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|
4887 if (_g1->obj_in_cs(obj)) { |
|
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|
4888 assert( obj->is_forwarded(), "invariant" ); |
|
4dfb2df418f2
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diff
changeset
|
4889 *p = obj->forwardee(); |
|
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|
4890 } |
|
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|
4891 } |
|
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|
4892 }; |
|
4dfb2df418f2
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|
4893 |
|
4dfb2df418f2
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|
4894 // Copying Keep Alive closure - can be called from both |
|
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|
4895 // serial and parallel code as long as different worker |
|
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|
4896 // threads utilize different G1ParScanThreadState instances |
|
4dfb2df418f2
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|
4897 // and different queues. |
|
4dfb2df418f2
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|
4898 |
|
4dfb2df418f2
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|
4899 class G1CopyingKeepAliveClosure: public OopClosure { |
|
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|
4900 G1CollectedHeap* _g1h; |
|
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|
4901 OopClosure* _copy_non_heap_obj_cl; |
|
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|
4902 OopsInHeapRegionClosure* _copy_perm_obj_cl; |
|
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|
4903 G1ParScanThreadState* _par_scan_state; |
|
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|
4904 |
|
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|
4905 public: |
|
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changeset
|
4906 G1CopyingKeepAliveClosure(G1CollectedHeap* g1h, |
|
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|
4907 OopClosure* non_heap_obj_cl, |
|
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|
4908 OopsInHeapRegionClosure* perm_obj_cl, |
|
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|
4909 G1ParScanThreadState* pss): |
|
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changeset
|
4910 _g1h(g1h), |
|
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|
4911 _copy_non_heap_obj_cl(non_heap_obj_cl), |
|
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|
4912 _copy_perm_obj_cl(perm_obj_cl), |
|
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|
4913 _par_scan_state(pss) |
|
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|
4914 {} |
|
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|
4915 |
|
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|
4916 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
4dfb2df418f2
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|
4917 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
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|
4918 |
|
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changeset
|
4919 template <class T> void do_oop_work(T* p) { |
|
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|
4920 oop obj = oopDesc::load_decode_heap_oop(p); |
|
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|
4921 |
|
4dfb2df418f2
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changeset
|
4922 if (_g1h->obj_in_cs(obj)) { |
|
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|
4923 // If the referent object has been forwarded (either copied |
|
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|
4924 // to a new location or to itself in the event of an |
|
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|
4925 // evacuation failure) then we need to update the reference |
|
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|
4926 // field and, if both reference and referent are in the G1 |
|
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|
4927 // heap, update the RSet for the referent. |
|
4dfb2df418f2
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|
4928 // |
|
4dfb2df418f2
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|
4929 // If the referent has not been forwarded then we have to keep |
|
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|
4930 // it alive by policy. Therefore we have copy the referent. |
|
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|
4931 // |
|
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|
4932 // If the reference field is in the G1 heap then we can push |
|
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|
4933 // on the PSS queue. When the queue is drained (after each |
|
4dfb2df418f2
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|
4934 // phase of reference processing) the object and it's followers |
|
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|
4935 // will be copied, the reference field set to point to the |
|
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4936 // new location, and the RSet updated. Otherwise we need to |
|
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|
4937 // use the the non-heap or perm closures directly to copy |
|
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|
4938 // the refernt object and update the pointer, while avoiding |
|
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|
4939 // updating the RSet. |
|
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|
4940 |
|
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|
4941 if (_g1h->is_in_g1_reserved(p)) { |
|
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|
4942 _par_scan_state->push_on_queue(p); |
|
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|
4943 } else { |
|
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|
4944 // The reference field is not in the G1 heap. |
|
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changeset
|
4945 if (_g1h->perm_gen()->is_in(p)) { |
|
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|
4946 _copy_perm_obj_cl->do_oop(p); |
|
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|
4947 } else { |
|
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changeset
|
4948 _copy_non_heap_obj_cl->do_oop(p); |
|
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|
4949 } |
|
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|
4950 } |
|
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|
4951 } |
|
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|
4952 } |
|
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|
4953 }; |
|
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|
4954 |
|
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changeset
|
4955 // Serial drain queue closure. Called as the 'complete_gc' |
|
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|
4956 // closure for each discovered list in some of the |
|
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|
4957 // reference processing phases. |
|
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|
4958 |
|
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|
4959 class G1STWDrainQueueClosure: public VoidClosure { |
|
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|
4960 protected: |
|
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changeset
|
4961 G1CollectedHeap* _g1h; |
|
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|
4962 G1ParScanThreadState* _par_scan_state; |
|
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|
4963 |
|
4dfb2df418f2
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|
4964 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } |
|
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|
4965 |
|
4dfb2df418f2
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diff
changeset
|
4966 public: |
|
4dfb2df418f2
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diff
changeset
|
4967 G1STWDrainQueueClosure(G1CollectedHeap* g1h, G1ParScanThreadState* pss) : |
|
4dfb2df418f2
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|
4968 _g1h(g1h), |
|
4dfb2df418f2
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diff
changeset
|
4969 _par_scan_state(pss) |
|
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changeset
|
4970 { } |
|
4dfb2df418f2
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diff
changeset
|
4971 |
|
4dfb2df418f2
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diff
changeset
|
4972 void do_void() { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4973 G1ParScanThreadState* const pss = par_scan_state(); |
|
4dfb2df418f2
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changeset
|
4974 pss->trim_queue(); |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4975 } |
|
4dfb2df418f2
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diff
changeset
|
4976 }; |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4977 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4978 // Parallel Reference Processing closures |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4979 |
|
4dfb2df418f2
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parents:
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diff
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|
4980 // Implementation of AbstractRefProcTaskExecutor for parallel reference |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4981 // processing during G1 evacuation pauses. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4982 |
|
4dfb2df418f2
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diff
changeset
|
4983 class G1STWRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
|
4dfb2df418f2
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diff
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|
4984 private: |
|
4dfb2df418f2
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diff
changeset
|
4985 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
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diff
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|
4986 RefToScanQueueSet* _queues; |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
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|
4987 FlexibleWorkGang* _workers; |
|
3979
4dfb2df418f2
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parents:
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diff
changeset
|
4988 int _active_workers; |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4989 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4990 public: |
|
4dfb2df418f2
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diff
changeset
|
4991 G1STWRefProcTaskExecutor(G1CollectedHeap* g1h, |
|
4095
bca17e38de00
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jmasa
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diff
changeset
|
4992 FlexibleWorkGang* workers, |
|
3979
4dfb2df418f2
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changeset
|
4993 RefToScanQueueSet *task_queues, |
|
4dfb2df418f2
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diff
changeset
|
4994 int n_workers) : |
|
4dfb2df418f2
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diff
changeset
|
4995 _g1h(g1h), |
|
4dfb2df418f2
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diff
changeset
|
4996 _queues(task_queues), |
|
4dfb2df418f2
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diff
changeset
|
4997 _workers(workers), |
|
4dfb2df418f2
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diff
changeset
|
4998 _active_workers(n_workers) |
|
4dfb2df418f2
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diff
changeset
|
4999 { |
|
4dfb2df418f2
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diff
changeset
|
5000 assert(n_workers > 0, "shouldn't call this otherwise"); |
|
4dfb2df418f2
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|
5001 } |
|
4dfb2df418f2
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diff
changeset
|
5002 |
|
4dfb2df418f2
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diff
changeset
|
5003 // Executes the given task using concurrent marking worker threads. |
|
4dfb2df418f2
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diff
changeset
|
5004 virtual void execute(ProcessTask& task); |
|
4dfb2df418f2
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diff
changeset
|
5005 virtual void execute(EnqueueTask& task); |
|
4dfb2df418f2
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changeset
|
5006 }; |
|
4dfb2df418f2
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diff
changeset
|
5007 |
|
4dfb2df418f2
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diff
changeset
|
5008 // Gang task for possibly parallel reference processing |
|
4dfb2df418f2
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diff
changeset
|
5009 |
|
4dfb2df418f2
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diff
changeset
|
5010 class G1STWRefProcTaskProxy: public AbstractGangTask { |
|
4dfb2df418f2
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diff
changeset
|
5011 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
|
4dfb2df418f2
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diff
changeset
|
5012 ProcessTask& _proc_task; |
|
4dfb2df418f2
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diff
changeset
|
5013 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
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diff
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|
5014 RefToScanQueueSet *_task_queues; |
|
4dfb2df418f2
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diff
changeset
|
5015 ParallelTaskTerminator* _terminator; |
|
4dfb2df418f2
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diff
changeset
|
5016 |
|
4dfb2df418f2
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diff
changeset
|
5017 public: |
|
4dfb2df418f2
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diff
changeset
|
5018 G1STWRefProcTaskProxy(ProcessTask& proc_task, |
|
4dfb2df418f2
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diff
changeset
|
5019 G1CollectedHeap* g1h, |
|
4dfb2df418f2
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diff
changeset
|
5020 RefToScanQueueSet *task_queues, |
|
4dfb2df418f2
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diff
changeset
|
5021 ParallelTaskTerminator* terminator) : |
|
4dfb2df418f2
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diff
changeset
|
5022 AbstractGangTask("Process reference objects in parallel"), |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5023 _proc_task(proc_task), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5024 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5025 _task_queues(task_queues), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5026 _terminator(terminator) |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5027 {} |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5028 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5029 virtual void work(int i) { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5030 // The reference processing task executed by a single worker. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5031 ResourceMark rm; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5032 HandleMark hm; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5033 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5034 G1STWIsAliveClosure is_alive(_g1h); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5035 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5036 G1ParScanThreadState pss(_g1h, i); |
|
4dfb2df418f2
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diff
changeset
|
5037 |
|
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|
5038 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
|
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|
5039 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
|
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|
5040 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
|
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|
5041 |
|
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|
5042 pss.set_evac_closure(&scan_evac_cl); |
|
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|
5043 pss.set_evac_failure_closure(&evac_failure_cl); |
|
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|
5044 pss.set_partial_scan_closure(&partial_scan_cl); |
|
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changeset
|
5045 |
|
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changeset
|
5046 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
|
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|
5047 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
|
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|
5048 |
|
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|
5049 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
|
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|
5050 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
|
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changeset
|
5051 |
|
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|
5052 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
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|
5053 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
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changeset
|
5054 |
|
4dfb2df418f2
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changeset
|
5055 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
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|
5056 // We also need to mark copied objects. |
|
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changeset
|
5057 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
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|
5058 copy_perm_cl = ©_mark_perm_cl; |
|
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|
5059 } |
|
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changeset
|
5060 |
|
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|
5061 // Keep alive closure. |
|
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|
5062 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
|
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|
5063 |
|
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|
5064 // Complete GC closure |
|
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|
5065 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _task_queues, _terminator); |
|
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|
5066 |
|
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|
5067 // Call the reference processing task's work routine. |
|
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|
5068 _proc_task.work(i, is_alive, keep_alive, drain_queue); |
|
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changeset
|
5069 |
|
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|
5070 // Note we cannot assert that the refs array is empty here as not all |
|
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|
5071 // of the processing tasks (specifically phase2 - pp2_work) execute |
|
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|
5072 // the complete_gc closure (which ordinarily would drain the queue) so |
|
4dfb2df418f2
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changeset
|
5073 // the queue may not be empty. |
|
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changeset
|
5074 } |
|
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|
5075 }; |
|
4dfb2df418f2
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diff
changeset
|
5076 |
|
4dfb2df418f2
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changeset
|
5077 // Driver routine for parallel reference processing. |
|
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changeset
|
5078 // Creates an instance of the ref processing gang |
|
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changeset
|
5079 // task and has the worker threads execute it. |
|
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|
5080 void G1STWRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
|
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changeset
|
5081 assert(_workers != NULL, "Need parallel worker threads."); |
|
4dfb2df418f2
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changeset
|
5082 |
|
4dfb2df418f2
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changeset
|
5083 ParallelTaskTerminator terminator(_active_workers, _queues); |
|
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|
5084 G1STWRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _queues, &terminator); |
|
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changeset
|
5085 |
|
4dfb2df418f2
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diff
changeset
|
5086 _g1h->set_par_threads(_active_workers); |
|
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|
5087 _workers->run_task(&proc_task_proxy); |
|
4dfb2df418f2
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changeset
|
5088 _g1h->set_par_threads(0); |
|
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|
5089 } |
|
4dfb2df418f2
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diff
changeset
|
5090 |
|
4dfb2df418f2
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diff
changeset
|
5091 // Gang task for parallel reference enqueueing. |
|
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changeset
|
5092 |
|
4dfb2df418f2
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diff
changeset
|
5093 class G1STWRefEnqueueTaskProxy: public AbstractGangTask { |
|
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|
5094 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
|
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|
5095 EnqueueTask& _enq_task; |
|
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changeset
|
5096 |
|
4dfb2df418f2
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diff
changeset
|
5097 public: |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5098 G1STWRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
|
4dfb2df418f2
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changeset
|
5099 AbstractGangTask("Enqueue reference objects in parallel"), |
|
4dfb2df418f2
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diff
changeset
|
5100 _enq_task(enq_task) |
|
4dfb2df418f2
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diff
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|
5101 { } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5102 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5103 virtual void work(int i) { |
|
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parents:
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diff
changeset
|
5104 _enq_task.work(i); |
|
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parents:
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diff
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|
5105 } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5106 }; |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5107 |
|
4dfb2df418f2
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diff
changeset
|
5108 // Driver routine for parallel reference enqueing. |
|
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changeset
|
5109 // Creates an instance of the ref enqueueing gang |
|
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changeset
|
5110 // task and has the worker threads execute it. |
|
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changeset
|
5111 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5112 void G1STWRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
|
4dfb2df418f2
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diff
changeset
|
5113 assert(_workers != NULL, "Need parallel worker threads."); |
|
4dfb2df418f2
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diff
changeset
|
5114 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5115 G1STWRefEnqueueTaskProxy enq_task_proxy(enq_task); |
|
4dfb2df418f2
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diff
changeset
|
5116 |
|
4dfb2df418f2
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diff
changeset
|
5117 _g1h->set_par_threads(_active_workers); |
|
4dfb2df418f2
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diff
changeset
|
5118 _workers->run_task(&enq_task_proxy); |
|
4dfb2df418f2
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diff
changeset
|
5119 _g1h->set_par_threads(0); |
|
4dfb2df418f2
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diff
changeset
|
5120 } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5121 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5122 // End of weak reference support closures |
|
4dfb2df418f2
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diff
changeset
|
5123 |
|
4dfb2df418f2
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diff
changeset
|
5124 // Abstract task used to preserve (i.e. copy) any referent objects |
|
4dfb2df418f2
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diff
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|
5125 // that are in the collection set and are pointed to by reference |
|
4dfb2df418f2
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diff
changeset
|
5126 // objects discovered by the CM ref processor. |
|
4dfb2df418f2
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diff
changeset
|
5127 |
|
4dfb2df418f2
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diff
changeset
|
5128 class G1ParPreserveCMReferentsTask: public AbstractGangTask { |
|
4dfb2df418f2
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diff
changeset
|
5129 protected: |
|
4dfb2df418f2
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diff
changeset
|
5130 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
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diff
changeset
|
5131 RefToScanQueueSet *_queues; |
|
4dfb2df418f2
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diff
changeset
|
5132 ParallelTaskTerminator _terminator; |
|
4dfb2df418f2
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diff
changeset
|
5133 int _n_workers; |
|
4dfb2df418f2
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diff
changeset
|
5134 |
|
4dfb2df418f2
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diff
changeset
|
5135 public: |
|
4dfb2df418f2
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diff
changeset
|
5136 G1ParPreserveCMReferentsTask(G1CollectedHeap* g1h,int workers, RefToScanQueueSet *task_queues) : |
|
4dfb2df418f2
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diff
changeset
|
5137 AbstractGangTask("ParPreserveCMReferents"), |
|
4dfb2df418f2
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diff
changeset
|
5138 _g1h(g1h), |
|
4dfb2df418f2
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diff
changeset
|
5139 _queues(task_queues), |
|
4dfb2df418f2
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diff
changeset
|
5140 _terminator(workers, _queues), |
|
4dfb2df418f2
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diff
changeset
|
5141 _n_workers(workers) |
|
4dfb2df418f2
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diff
changeset
|
5142 { } |
|
4dfb2df418f2
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diff
changeset
|
5143 |
|
4dfb2df418f2
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diff
changeset
|
5144 void work(int i) { |
|
4dfb2df418f2
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diff
changeset
|
5145 ResourceMark rm; |
|
4dfb2df418f2
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diff
changeset
|
5146 HandleMark hm; |
|
4dfb2df418f2
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diff
changeset
|
5147 |
|
4dfb2df418f2
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diff
changeset
|
5148 G1ParScanThreadState pss(_g1h, i); |
|
4dfb2df418f2
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changeset
|
5149 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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changeset
|
5150 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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|
5151 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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diff
changeset
|
5152 |
|
4dfb2df418f2
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diff
changeset
|
5153 pss.set_evac_closure(&scan_evac_cl); |
|
4dfb2df418f2
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changeset
|
5154 pss.set_evac_failure_closure(&evac_failure_cl); |
|
4dfb2df418f2
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diff
changeset
|
5155 pss.set_partial_scan_closure(&partial_scan_cl); |
|
4dfb2df418f2
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diff
changeset
|
5156 |
|
4dfb2df418f2
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diff
changeset
|
5157 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
|
4dfb2df418f2
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diff
changeset
|
5158 |
|
4dfb2df418f2
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diff
changeset
|
5159 |
|
4dfb2df418f2
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diff
changeset
|
5160 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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changeset
|
5161 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
|
5162 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5163 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
|
5164 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5165 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5166 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5167 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5168 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5169 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5170 // 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
|
5171 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5172 copy_perm_cl = ©_mark_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5173 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5174 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5175 // Is alive closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5176 G1AlwaysAliveClosure always_alive(_g1h); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5177 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5178 // Copying keep alive closure. Applied to referent objects that need |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5179 // to be copied. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5180 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
|
5181 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5182 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
|
5183 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5184 int limit = ReferenceProcessor::number_of_subclasses_of_ref() * rp->max_num_q(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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changeset
|
5185 int stride = MIN2(MAX2(_n_workers, 1), limit); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5186 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5187 // limit is set using max_num_q() - which was set using ParallelGCThreads. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5188 // So this must be true - but assert just in case someone decides to |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5189 // change the worker ids. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5190 assert(0 <= i && i < limit, "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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changeset
|
5191 assert(!rp->discovery_is_atomic(), "check this code"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5192 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5193 // Select discovered lists [i, i+stride, i+2*stride,...,limit) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5194 for (int idx = i; idx < limit; idx += stride) { |
|
4014
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
4013
diff
changeset
|
5195 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
|
5196 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5197 DiscoveredListIterator iter(ref_list, &keep_alive, &always_alive); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5198 while (iter.has_next()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5199 // Since discovery is not atomic for the CM ref processor, we |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5200 // can see some null referent objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5201 iter.load_ptrs(DEBUG_ONLY(true)); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5202 oop ref = iter.obj(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5203 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5204 // This will filter nulls. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5205 if (iter.is_referent_alive()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5206 iter.make_referent_alive(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5207 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5208 iter.move_to_next(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5209 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5210 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5211 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5212 // Drain the queue - which may cause stealing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5213 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _queues, &_terminator); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5214 drain_queue.do_void(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5215 // Allocation buffers were retired at the end of G1ParEvacuateFollowersClosure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5216 assert(pss.refs()->is_empty(), "should be"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5217 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5218 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5219 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5220 // Weak Reference processing during an evacuation pause (part 1). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5221 void G1CollectedHeap::process_discovered_references() { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5222 double ref_proc_start = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5223 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5224 ReferenceProcessor* rp = _ref_processor_stw; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5225 assert(rp->discovery_enabled(), "should have been enabled"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5226 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5227 // Any reference objects, in the collection set, that were 'discovered' |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5228 // by the CM ref processor should have already been copied (either by |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5229 // applying the external root copy closure to the discovered lists, or |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5230 // by following an RSet entry). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5231 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5232 // 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
|
5233 // 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
|
5234 // processor would have seen that the reference object had already |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5235 // been 'discovered' and would have skipped discovering the reference, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5236 // 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
|
5237 // 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
|
5238 // referent object. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5239 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5240 // We need to explicitly copy these referent objects - the references |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5241 // will be processed at the end of remarking. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5242 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5243 // We also need to do this copying before we process the reference |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5244 // 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
|
5245 // referents points to another object which is also referenced by an |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5246 // object discovered by the STW ref processor. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5247 |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5248 int active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5249 workers()->active_workers() : 1); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5250 |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5251 assert(active_workers == workers()->active_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5252 "Need to reset active_workers"); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5253 set_par_threads(active_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5254 G1ParPreserveCMReferentsTask keep_cm_referents(this, active_workers, _task_queues); |
|
3979
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 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5257 workers()->run_task(&keep_cm_referents); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5258 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5259 keep_cm_referents.work(0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5260 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5261 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5262 set_par_threads(0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5263 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5264 // Closure to test whether a referent is alive. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5265 G1STWIsAliveClosure is_alive(this); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5266 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5267 // Even when parallel reference processing is enabled, the processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5268 // 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
|
5269 // 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
|
5270 // JNI refs. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5271 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5272 // Use only a single queue for this PSS. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5273 G1ParScanThreadState pss(this, 0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5274 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5275 // We do not embed a reference processor in the copying/scanning |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5276 // closures while we're actually processing the discovered |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5277 // reference objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5278 G1ParScanHeapEvacClosure scan_evac_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5279 G1ParScanHeapEvacFailureClosure evac_failure_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5280 G1ParScanPartialArrayClosure partial_scan_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5281 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5282 pss.set_evac_closure(&scan_evac_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5283 pss.set_evac_failure_closure(&evac_failure_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5284 pss.set_partial_scan_closure(&partial_scan_cl); |
|
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 assert(pss.refs()->is_empty(), "pre-condition"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5287 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5288 G1ParScanExtRootClosure only_copy_non_heap_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5289 G1ParScanPermClosure only_copy_perm_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5290 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5291 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5292 G1ParScanAndMarkPermClosure copy_mark_perm_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5293 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5294 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5295 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5296 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5297 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5298 // We also need to mark copied objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5299 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5300 copy_perm_cl = ©_mark_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5301 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5302 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5303 // Keep alive closure. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5304 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
|
5305 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5306 // Serial Complete GC closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5307 G1STWDrainQueueClosure drain_queue(this, &pss); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5308 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5309 // Setup the soft refs policy... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5310 rp->setup_policy(false); |
|
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 if (!rp->processing_is_mt()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5313 // Serial reference processing... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5314 rp->process_discovered_references(&is_alive, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5315 &keep_alive, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5316 &drain_queue, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5317 NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5318 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5319 // Parallel reference processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5320 assert(rp->num_q() == active_workers, "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5321 assert(active_workers <= rp->max_num_q(), "sanity"); |
|
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 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5324 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
|
5325 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5326 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5327 // We have completed copying any necessary live referent objects |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5328 // (that were not copied during the actual pause) so we can |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5329 // retire any active alloc buffers |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5330 pss.retire_alloc_buffers(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5331 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
|
5332 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5333 double ref_proc_time = os::elapsedTime() - ref_proc_start; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5334 g1_policy()->record_ref_proc_time(ref_proc_time * 1000.0); |
|
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 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5337 // Weak Reference processing during an evacuation pause (part 2). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5338 void G1CollectedHeap::enqueue_discovered_references() { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5339 double ref_enq_start = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5340 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5341 ReferenceProcessor* rp = _ref_processor_stw; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5342 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
|
5343 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5344 // Now enqueue any remaining on the discovered lists on to |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5345 // the pending list. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5346 if (!rp->processing_is_mt()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5347 // Serial reference processing... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5348 rp->enqueue_discovered_references(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5349 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5350 // Parallel reference enqueuing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5351 |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5352 int active_workers = (ParallelGCThreads > 0 ? workers()->active_workers() : 1); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5353 assert(active_workers == workers()->active_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5354 "Need to reset active_workers"); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5355 assert(rp->num_q() == active_workers, "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5356 assert(active_workers <= rp->max_num_q(), "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5357 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5358 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5359 rp->enqueue_discovered_references(&par_task_executor); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5360 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5361 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5362 rp->verify_no_references_recorded(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5363 assert(!rp->discovery_enabled(), "should have been disabled"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5364 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5365 // FIXME |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5366 // 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
|
5367 // 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
|
5368 // and could signicantly increase the pause time. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5369 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5370 double ref_enq_time = os::elapsedTime() - ref_enq_start; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5371 g1_policy()->record_ref_enq_time(ref_enq_time * 1000.0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5372 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5373 |
| 342 | 5374 void G1CollectedHeap::evacuate_collection_set() { |
| 5375 set_evacuation_failed(false); | |
| 5376 | |
| 5377 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
| 5378 concurrent_g1_refine()->set_use_cache(false); | |
| 889 | 5379 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
| 5380 | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5381 int n_workers; |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5382 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5383 n_workers = |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5384 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5385 workers()->active_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5386 Threads::number_of_non_daemon_threads()); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5387 assert(UseDynamicNumberOfGCThreads || |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5388 n_workers == workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5389 "If not dynamic should be using all the workers"); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5390 set_par_threads(n_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5391 } else { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5392 assert(n_par_threads() == 0, |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5393 "Should be the original non-parallel value"); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5394 n_workers = 1; |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5395 } |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5396 workers()->set_active_workers(n_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5397 |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5398 G1ParTask g1_par_task(this, _task_queues); |
| 342 | 5399 |
| 5400 init_for_evac_failure(NULL); | |
| 5401 | |
| 5402 rem_set()->prepare_for_younger_refs_iterate(true); | |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5403 |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5404 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
| 342 | 5405 double start_par = os::elapsedTime(); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5406 |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
5407 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 5408 // The individual threads will set their evac-failure closures. |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5409 StrongRootsScope srs(this); |
| 1709 | 5410 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5411 // These tasks use ShareHeap::_process_strong_tasks |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5412 assert(UseDynamicNumberOfGCThreads || |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5413 workers()->active_workers() == workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5414 "If not dynamic should be using all the workers"); |
| 342 | 5415 workers()->run_task(&g1_par_task); |
| 5416 } else { | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5417 StrongRootsScope srs(this); |
| 342 | 5418 g1_par_task.work(0); |
| 5419 } | |
| 5420 | |
| 5421 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
| 5422 g1_policy()->record_par_time(par_time); | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5423 |
| 342 | 5424 set_par_threads(0); |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5425 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5426 // Process any discovered reference objects - we have |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5427 // to do this _before_ we retire the GC alloc regions |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5428 // as we may have to copy some 'reachable' referent |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5429 // objects (and their reachable sub-graphs) that were |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5430 // not copied during the pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5431 process_discovered_references(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5432 |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5433 // Weak root processing. |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5434 // 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
|
5435 // 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
|
5436 // here too. |
| 342 | 5437 { |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5438 G1STWIsAliveClosure is_alive(this); |
| 342 | 5439 G1KeepAliveClosure keep_alive(this); |
| 5440 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
| 5441 } | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5442 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
changeset
|
5443 release_gc_alloc_regions(); |
| 342 | 5444 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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parents:
595
diff
changeset
|
5445 |
| 889 | 5446 concurrent_g1_refine()->clear_hot_cache(); |
| 342 | 5447 concurrent_g1_refine()->set_use_cache(true); |
| 5448 | |
| 5449 finalize_for_evac_failure(); | |
| 5450 | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5451 // Must do this before clearing the per-region evac-failure flags |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5452 // (which is currently done when we free the collection set). |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5453 // We also only do this if marking is actually in progress and so |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5454 // have to do this before we set the mark_in_progress flag at the |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5455 // end of an initial mark pause. |
| 342 | 5456 concurrent_mark()->complete_marking_in_collection_set(); |
| 5457 | |
| 5458 if (evacuation_failed()) { | |
| 5459 remove_self_forwarding_pointers(); | |
| 5460 if (PrintGCDetails) { | |
|
1719
b63010841f78
6975964: G1: print out a more descriptive message for evacuation failure when +PrintGCDetails is set
tonyp
parents:
1718
diff
changeset
|
5461 gclog_or_tty->print(" (to-space overflow)"); |
| 342 | 5462 } else if (PrintGC) { |
| 5463 gclog_or_tty->print("--"); | |
| 5464 } | |
| 5465 } | |
| 5466 | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5467 // Enqueue any remaining references remaining on the STW |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5468 // reference processor's discovered lists. We need to do |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5469 // this after the card table is cleaned (and verified) as |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5470 // the act of enqueuing entries on to the pending list |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5471 // will log these updates (and dirty their associated |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5472 // cards). We need these updates logged to update any |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5473 // RSets. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5474 enqueue_discovered_references(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5475 |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5476 if (G1DeferredRSUpdate) { |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5477 RedirtyLoggedCardTableEntryFastClosure redirty; |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5478 dirty_card_queue_set().set_closure(&redirty); |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5479 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
| 1111 | 5480 |
| 5481 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
| 5482 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5483 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
|
5484 } |
| 342 | 5485 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
| 5486 } | |
| 5487 | |
| 2173 | 5488 void G1CollectedHeap::free_region_if_empty(HeapRegion* hr, |
| 2152 | 5489 size_t* pre_used, |
| 5490 FreeRegionList* free_list, | |
| 4072 | 5491 OldRegionSet* old_proxy_set, |
| 2152 | 5492 HumongousRegionSet* humongous_proxy_set, |
| 2173 | 5493 HRRSCleanupTask* hrrs_cleanup_task, |
| 2152 | 5494 bool par) { |
| 5495 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { | |
| 5496 if (hr->isHumongous()) { | |
| 5497 assert(hr->startsHumongous(), "we should only see starts humongous"); | |
| 5498 free_humongous_region(hr, pre_used, free_list, humongous_proxy_set, par); | |
| 5499 } else { | |
| 4072 | 5500 _old_set.remove_with_proxy(hr, old_proxy_set); |
| 2152 | 5501 free_region(hr, pre_used, free_list, par); |
| 342 | 5502 } |
| 2173 | 5503 } else { |
| 5504 hr->rem_set()->do_cleanup_work(hrrs_cleanup_task); | |
| 342 | 5505 } |
| 5506 } | |
| 5507 | |
| 2152 | 5508 void G1CollectedHeap::free_region(HeapRegion* hr, |
| 5509 size_t* pre_used, | |
| 5510 FreeRegionList* free_list, | |
| 5511 bool par) { | |
| 5512 assert(!hr->isHumongous(), "this is only for non-humongous regions"); | |
| 5513 assert(!hr->is_empty(), "the region should not be empty"); | |
| 5514 assert(free_list != NULL, "pre-condition"); | |
| 5515 | |
| 5516 *pre_used += hr->used(); | |
| 5517 hr->hr_clear(par, true /* clear_space */); | |
|
2432
455328d90876
7029458: G1: Add newly-reclaimed regions to the beginning of the region free list, not the end
tonyp
parents:
2369
diff
changeset
|
5518 free_list->add_as_head(hr); |
| 2152 | 5519 } |
| 5520 | |
| 5521 void G1CollectedHeap::free_humongous_region(HeapRegion* hr, | |
| 5522 size_t* pre_used, | |
| 5523 FreeRegionList* free_list, | |
| 5524 HumongousRegionSet* humongous_proxy_set, | |
| 5525 bool par) { | |
| 5526 assert(hr->startsHumongous(), "this is only for starts humongous regions"); | |
| 5527 assert(free_list != NULL, "pre-condition"); | |
| 5528 assert(humongous_proxy_set != NULL, "pre-condition"); | |
| 5529 | |
| 5530 size_t hr_used = hr->used(); | |
| 5531 size_t hr_capacity = hr->capacity(); | |
| 5532 size_t hr_pre_used = 0; | |
| 5533 _humongous_set.remove_with_proxy(hr, humongous_proxy_set); | |
| 5534 hr->set_notHumongous(); | |
| 5535 free_region(hr, &hr_pre_used, free_list, par); | |
| 5536 | |
| 3766 | 5537 size_t i = hr->hrs_index() + 1; |
| 2152 | 5538 size_t num = 1; |
| 3766 | 5539 while (i < n_regions()) { |
| 5540 HeapRegion* curr_hr = region_at(i); | |
| 2152 | 5541 if (!curr_hr->continuesHumongous()) { |
| 5542 break; | |
| 5543 } | |
| 5544 curr_hr->set_notHumongous(); | |
| 5545 free_region(curr_hr, &hr_pre_used, free_list, par); | |
| 5546 num += 1; | |
| 5547 i += 1; | |
| 5548 } | |
| 5549 assert(hr_pre_used == hr_used, | |
| 5550 err_msg("hr_pre_used: "SIZE_FORMAT" and hr_used: "SIZE_FORMAT" " | |
| 5551 "should be the same", hr_pre_used, hr_used)); | |
| 5552 *pre_used += hr_pre_used; | |
| 5553 } | |
| 5554 | |
| 5555 void G1CollectedHeap::update_sets_after_freeing_regions(size_t pre_used, | |
| 5556 FreeRegionList* free_list, | |
| 4072 | 5557 OldRegionSet* old_proxy_set, |
| 2152 | 5558 HumongousRegionSet* humongous_proxy_set, |
| 5559 bool par) { | |
| 5560 if (pre_used > 0) { | |
| 5561 Mutex* lock = (par) ? ParGCRareEvent_lock : NULL; | |
| 342 | 5562 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); |
| 2152 | 5563 assert(_summary_bytes_used >= pre_used, |
| 5564 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" " | |
| 5565 "should be >= pre_used: "SIZE_FORMAT, | |
| 5566 _summary_bytes_used, pre_used)); | |
| 342 | 5567 _summary_bytes_used -= pre_used; |
| 2152 | 5568 } |
| 5569 if (free_list != NULL && !free_list->is_empty()) { | |
| 5570 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); | |
|
2432
455328d90876
7029458: G1: Add newly-reclaimed regions to the beginning of the region free list, not the end
tonyp
parents:
2369
diff
changeset
|
5571 _free_list.add_as_head(free_list); |
| 2152 | 5572 } |
| 4072 | 5573 if (old_proxy_set != NULL && !old_proxy_set->is_empty()) { |
| 5574 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
| 5575 _old_set.update_from_proxy(old_proxy_set); | |
| 5576 } | |
| 2152 | 5577 if (humongous_proxy_set != NULL && !humongous_proxy_set->is_empty()) { |
| 5578 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
| 5579 _humongous_set.update_from_proxy(humongous_proxy_set); | |
| 342 | 5580 } |
| 5581 } | |
| 5582 | |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5583 class G1ParCleanupCTTask : public AbstractGangTask { |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5584 CardTableModRefBS* _ct_bs; |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5585 G1CollectedHeap* _g1h; |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5586 HeapRegion* volatile _su_head; |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5587 public: |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5588 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5589 G1CollectedHeap* g1h) : |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5590 AbstractGangTask("G1 Par Cleanup CT Task"), |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5591 _ct_bs(ct_bs), _g1h(g1h) { } |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5592 |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5593 void work(int i) { |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5594 HeapRegion* r; |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5595 while (r = _g1h->pop_dirty_cards_region()) { |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5596 clear_cards(r); |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5597 } |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5598 } |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5599 |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5600 void clear_cards(HeapRegion* r) { |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5601 // Cards of the survivors should have already been dirtied. |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5602 if (!r->is_survivor()) { |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5603 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5604 } |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5605 } |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5606 }; |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5607 |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5608 #ifndef PRODUCT |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5609 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
5610 G1CollectedHeap* _g1h; |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5611 CardTableModRefBS* _ct_bs; |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5612 public: |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
5613 G1VerifyCardTableCleanup(G1CollectedHeap* g1h, CardTableModRefBS* ct_bs) |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
5614 : _g1h(g1h), _ct_bs(ct_bs) { } |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5615 virtual bool doHeapRegion(HeapRegion* r) { |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5616 if (r->is_survivor()) { |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
5617 _g1h->verify_dirty_region(r); |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5618 } else { |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
5619 _g1h->verify_not_dirty_region(r); |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5620 } |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5621 return false; |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5622 } |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5623 }; |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5624 |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
5625 void G1CollectedHeap::verify_not_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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|
5626 // All of the region should be clean. |
|
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|
5627 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); |
|
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|
5628 MemRegion mr(hr->bottom(), hr->end()); |
|
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|
5629 ct_bs->verify_not_dirty_region(mr); |
|
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|
5630 } |
|
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|
5631 |
|
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|
5632 void G1CollectedHeap::verify_dirty_region(HeapRegion* hr) { |
|
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|
5633 // We cannot guarantee that [bottom(),end()] is dirty. Threads |
|
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|
5634 // dirty allocated blocks as they allocate them. The thread that |
|
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|
5635 // retires each region and replaces it with a new one will do a |
|
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|
5636 // maximal allocation to fill in [pre_dummy_top(),end()] but will |
|
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|
5637 // not dirty that area (one less thing to have to do while holding |
|
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|
5638 // a lock). So we can only verify that [bottom(),pre_dummy_top()] |
|
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7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5639 // is dirty. |
|
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|
5640 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
|
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|
5641 MemRegion mr(hr->bottom(), hr->pre_dummy_top()); |
|
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|
5642 ct_bs->verify_dirty_region(mr); |
|
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|
5643 } |
|
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|
5644 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
5645 void G1CollectedHeap::verify_dirty_young_list(HeapRegion* head) { |
|
3317
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|
5646 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
|
2433
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|
5647 for (HeapRegion* hr = head; hr != NULL; hr = hr->get_next_young_region()) { |
|
3317
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|
5648 verify_dirty_region(hr); |
|
2433
abdfc822206f
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|
5649 } |
|
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|
5650 } |
|
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|
5651 |
|
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|
5652 void G1CollectedHeap::verify_dirty_young_regions() { |
|
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|
5653 verify_dirty_young_list(_young_list->first_region()); |
|
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|
5654 verify_dirty_young_list(_young_list->first_survivor_region()); |
|
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|
5655 } |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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|
5656 #endif |
|
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|
5657 |
| 342 | 5658 void G1CollectedHeap::cleanUpCardTable() { |
| 5659 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
| 5660 double start = os::elapsedTime(); | |
| 5661 | |
| 4023 | 5662 { |
| 5663 // Iterate over the dirty cards region list. | |
| 5664 G1ParCleanupCTTask cleanup_task(ct_bs, this); | |
| 5665 | |
| 5666 if (ParallelGCThreads > 0) { | |
| 5667 set_par_threads(workers()->total_workers()); | |
| 5668 workers()->run_task(&cleanup_task); | |
| 5669 set_par_threads(0); | |
| 5670 } else { | |
| 5671 while (_dirty_cards_region_list) { | |
| 5672 HeapRegion* r = _dirty_cards_region_list; | |
| 5673 cleanup_task.clear_cards(r); | |
| 5674 _dirty_cards_region_list = r->get_next_dirty_cards_region(); | |
| 5675 if (_dirty_cards_region_list == r) { | |
| 5676 // The last region. | |
| 5677 _dirty_cards_region_list = NULL; | |
| 5678 } | |
| 5679 r->set_next_dirty_cards_region(NULL); | |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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diff
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|
5680 } |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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diff
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|
5681 } |
| 4023 | 5682 #ifndef PRODUCT |
| 5683 if (G1VerifyCTCleanup || VerifyAfterGC) { | |
| 5684 G1VerifyCardTableCleanup cleanup_verifier(this, ct_bs); | |
| 5685 heap_region_iterate(&cleanup_verifier); | |
| 5686 } | |
| 5687 #endif | |
|
940
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|
5688 } |
|
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|
5689 |
| 342 | 5690 double elapsed = os::elapsedTime() - start; |
|
3979
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6484982: G1: process references during evacuation pauses
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|
5691 g1_policy()->record_clear_ct_time(elapsed * 1000.0); |
| 342 | 5692 } |
| 5693 | |
| 5694 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
| 2152 | 5695 size_t pre_used = 0; |
| 5696 FreeRegionList local_free_list("Local List for CSet Freeing"); | |
| 5697 | |
| 342 | 5698 double young_time_ms = 0.0; |
| 5699 double non_young_time_ms = 0.0; | |
| 5700 | |
|
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|
5701 // Since the collection set is a superset of the the young list, |
|
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|
5702 // all we need to do to clear the young list is clear its |
|
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|
5703 // head and length, and unlink any young regions in the code below |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5704 _young_list->clear(); |
|
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|
5705 |
| 342 | 5706 G1CollectorPolicy* policy = g1_policy(); |
| 5707 | |
| 5708 double start_sec = os::elapsedTime(); | |
| 5709 bool non_young = true; | |
| 5710 | |
| 5711 HeapRegion* cur = cs_head; | |
| 5712 int age_bound = -1; | |
| 5713 size_t rs_lengths = 0; | |
| 5714 | |
| 5715 while (cur != NULL) { | |
| 2361 | 5716 assert(!is_on_master_free_list(cur), "sanity"); |
| 342 | 5717 if (non_young) { |
| 5718 if (cur->is_young()) { | |
| 5719 double end_sec = os::elapsedTime(); | |
| 5720 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 5721 non_young_time_ms += elapsed_ms; | |
| 5722 | |
| 5723 start_sec = os::elapsedTime(); | |
| 5724 non_young = false; | |
| 5725 } | |
| 5726 } else { | |
|
4097
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5727 if (!cur->is_young()) { |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5728 double end_sec = os::elapsedTime(); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5729 double elapsed_ms = (end_sec - start_sec) * 1000.0; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5730 young_time_ms += elapsed_ms; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5731 |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5732 start_sec = os::elapsedTime(); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5733 non_young = true; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
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diff
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|
5734 } |
| 342 | 5735 } |
| 5736 | |
| 5737 rs_lengths += cur->rem_set()->occupied(); | |
| 5738 | |
| 5739 HeapRegion* next = cur->next_in_collection_set(); | |
| 5740 assert(cur->in_collection_set(), "bad CS"); | |
| 5741 cur->set_next_in_collection_set(NULL); | |
| 5742 cur->set_in_collection_set(false); | |
| 5743 | |
| 5744 if (cur->is_young()) { | |
| 5745 int index = cur->young_index_in_cset(); | |
|
4090
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7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
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|
5746 assert(index != -1, "invariant"); |
|
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
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|
5747 assert((size_t) index < policy->young_cset_region_length(), "invariant"); |
| 342 | 5748 size_t words_survived = _surviving_young_words[index]; |
| 5749 cur->record_surv_words_in_group(words_survived); | |
|
1394
1316cec51b4d
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|
5750 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
5751 // At this point the we have 'popped' cur from the collection set |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5752 // (linked via next_in_collection_set()) but it is still in the |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
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|
5753 // young list (linked via next_young_region()). Clear the |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5754 // _next_young_region field. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5755 cur->set_next_young_region(NULL); |
| 342 | 5756 } else { |
| 5757 int index = cur->young_index_in_cset(); | |
|
4090
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tonyp
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changeset
|
5758 assert(index == -1, "invariant"); |
| 342 | 5759 } |
| 5760 | |
| 5761 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
| 5762 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
| 5763 "invariant" ); | |
| 5764 | |
| 5765 if (!cur->evacuation_failed()) { | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
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|
5766 MemRegion used_mr = cur->used_region(); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
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|
5767 |
| 342 | 5768 // And the region is empty. |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
4095
diff
changeset
|
5769 assert(!used_mr.is_empty(), "Should not have empty regions in a CS."); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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4095
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|
5770 |
|
dc467e8b2c5e
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4095
diff
changeset
|
5771 // If marking is in progress then clear any objects marked in |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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4095
diff
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|
5772 // the current region. Note mark_in_progress() returns false, |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
changeset
|
5773 // even during an initial mark pause, until the set_marking_started() |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5774 // call which takes place later in the pause. |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
changeset
|
5775 if (mark_in_progress()) { |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
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|
5776 assert(!g1_policy()->during_initial_mark_pause(), "sanity"); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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4095
diff
changeset
|
5777 _cm->nextMarkBitMap()->clearRange(used_mr); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
4095
diff
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|
5778 } |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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4095
diff
changeset
|
5779 |
| 2152 | 5780 free_region(cur, &pre_used, &local_free_list, false /* par */); |
| 342 | 5781 } else { |
| 5782 cur->uninstall_surv_rate_group(); | |
|
4090
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changeset
|
5783 if (cur->is_young()) { |
| 342 | 5784 cur->set_young_index_in_cset(-1); |
|
4090
a88de71c4e3a
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diff
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|
5785 } |
| 342 | 5786 cur->set_not_young(); |
| 5787 cur->set_evacuation_failed(false); | |
| 4072 | 5788 // The region is now considered to be old. |
| 5789 _old_set.add(cur); | |
| 342 | 5790 } |
| 5791 cur = next; | |
| 5792 } | |
| 5793 | |
| 5794 policy->record_max_rs_lengths(rs_lengths); | |
| 5795 policy->cset_regions_freed(); | |
| 5796 | |
| 5797 double end_sec = os::elapsedTime(); | |
| 5798 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
|
4097
dc467e8b2c5e
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|
5799 |
|
dc467e8b2c5e
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diff
changeset
|
5800 if (non_young) { |
| 342 | 5801 non_young_time_ms += elapsed_ms; |
|
4097
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|
5802 } else { |
| 342 | 5803 young_time_ms += elapsed_ms; |
|
4097
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|
5804 } |
| 342 | 5805 |
| 2152 | 5806 update_sets_after_freeing_regions(pre_used, &local_free_list, |
| 4072 | 5807 NULL /* old_proxy_set */, |
| 2152 | 5808 NULL /* humongous_proxy_set */, |
| 5809 false /* par */); | |
| 342 | 5810 policy->record_young_free_cset_time_ms(young_time_ms); |
| 5811 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
| 5812 } | |
| 5813 | |
|
1394
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|
5814 // This routine is similar to the above but does not record |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
5815 // any policy statistics or update free lists; we are abandoning |
|
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1391
diff
changeset
|
5816 // the current incremental collection set in preparation of a |
|
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|
5817 // full collection. After the full GC we will start to build up |
|
1316cec51b4d
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|
5818 // the incremental collection set again. |
|
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diff
changeset
|
5819 // This is only called when we're doing a full collection |
|
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|
5820 // and is immediately followed by the tearing down of the young list. |
|
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1391
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|
5821 |
|
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changeset
|
5822 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5823 HeapRegion* cur = cs_head; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5824 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5825 while (cur != NULL) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5826 HeapRegion* next = cur->next_in_collection_set(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5827 assert(cur->in_collection_set(), "bad CS"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5828 cur->set_next_in_collection_set(NULL); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5829 cur->set_in_collection_set(false); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5830 cur->set_young_index_in_cset(-1); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5831 cur = next; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5832 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5833 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5834 |
| 2152 | 5835 void G1CollectedHeap::set_free_regions_coming() { |
| 5836 if (G1ConcRegionFreeingVerbose) { | |
| 5837 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
| 5838 "setting free regions coming"); | |
| 5839 } | |
| 5840 | |
| 5841 assert(!free_regions_coming(), "pre-condition"); | |
| 5842 _free_regions_coming = true; | |
| 342 | 5843 } |
| 5844 | |
| 2152 | 5845 void G1CollectedHeap::reset_free_regions_coming() { |
| 5846 { | |
| 5847 assert(free_regions_coming(), "pre-condition"); | |
| 5848 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 5849 _free_regions_coming = false; | |
| 5850 SecondaryFreeList_lock->notify_all(); | |
| 5851 } | |
| 5852 | |
| 5853 if (G1ConcRegionFreeingVerbose) { | |
| 5854 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
| 5855 "reset free regions coming"); | |
| 342 | 5856 } |
| 5857 } | |
| 5858 | |
| 2152 | 5859 void G1CollectedHeap::wait_while_free_regions_coming() { |
| 5860 // Most of the time we won't have to wait, so let's do a quick test | |
| 5861 // first before we take the lock. | |
| 5862 if (!free_regions_coming()) { | |
| 5863 return; | |
| 5864 } | |
| 5865 | |
| 5866 if (G1ConcRegionFreeingVerbose) { | |
| 5867 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
| 5868 "waiting for free regions"); | |
| 342 | 5869 } |
| 5870 | |
| 5871 { | |
| 2152 | 5872 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
| 5873 while (free_regions_coming()) { | |
| 5874 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 342 | 5875 } |
| 2152 | 5876 } |
| 5877 | |
| 5878 if (G1ConcRegionFreeingVerbose) { | |
| 5879 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
| 5880 "done waiting for free regions"); | |
| 5881 } | |
| 342 | 5882 } |
| 5883 | |
| 5884 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
| 5885 assert(heap_lock_held_for_gc(), | |
| 5886 "the heap lock should already be held by or for this thread"); | |
| 5887 _young_list->push_region(hr); | |
| 5888 } | |
| 5889 | |
| 5890 class NoYoungRegionsClosure: public HeapRegionClosure { | |
| 5891 private: | |
| 5892 bool _success; | |
| 5893 public: | |
| 5894 NoYoungRegionsClosure() : _success(true) { } | |
| 5895 bool doHeapRegion(HeapRegion* r) { | |
| 5896 if (r->is_young()) { | |
| 5897 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
| 5898 r->bottom(), r->end()); | |
| 5899 _success = false; | |
| 5900 } | |
| 5901 return false; | |
| 5902 } | |
| 5903 bool success() { return _success; } | |
| 5904 }; | |
| 5905 | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5906 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5907 bool ret = _young_list->check_list_empty(check_sample); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5908 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5909 if (check_heap) { |
| 342 | 5910 NoYoungRegionsClosure closure; |
| 5911 heap_region_iterate(&closure); | |
| 5912 ret = ret && closure.success(); | |
| 5913 } | |
| 5914 | |
| 5915 return ret; | |
| 5916 } | |
| 5917 | |
| 4072 | 5918 class TearDownRegionSetsClosure : public HeapRegionClosure { |
| 5919 private: | |
| 5920 OldRegionSet *_old_set; | |
| 2152 | 5921 |
| 342 | 5922 public: |
| 4072 | 5923 TearDownRegionSetsClosure(OldRegionSet* old_set) : _old_set(old_set) { } |
| 2152 | 5924 |
| 342 | 5925 bool doHeapRegion(HeapRegion* r) { |
| 4072 | 5926 if (r->is_empty()) { |
| 5927 // We ignore empty regions, we'll empty the free list afterwards | |
| 5928 } else if (r->is_young()) { | |
| 5929 // We ignore young regions, we'll empty the young list afterwards | |
| 5930 } else if (r->isHumongous()) { | |
| 5931 // We ignore humongous regions, we're not tearing down the | |
| 5932 // humongous region set | |
| 342 | 5933 } else { |
| 4072 | 5934 // The rest should be old |
| 5935 _old_set->remove(r); | |
| 342 | 5936 } |
| 5937 return false; | |
| 5938 } | |
| 5939 | |
| 4072 | 5940 ~TearDownRegionSetsClosure() { |
| 5941 assert(_old_set->is_empty(), "post-condition"); | |
| 2152 | 5942 } |
| 342 | 5943 }; |
| 5944 | |
| 4072 | 5945 void G1CollectedHeap::tear_down_region_sets(bool free_list_only) { |
| 5946 assert_at_safepoint(true /* should_be_vm_thread */); | |
| 5947 | |
| 5948 if (!free_list_only) { | |
| 5949 TearDownRegionSetsClosure cl(&_old_set); | |
| 5950 heap_region_iterate(&cl); | |
| 5951 | |
| 5952 // Need to do this after the heap iteration to be able to | |
| 5953 // recognize the young regions and ignore them during the iteration. | |
| 5954 _young_list->empty_list(); | |
| 5955 } | |
| 5956 _free_list.remove_all(); | |
| 5957 } | |
| 5958 | |
| 5959 class RebuildRegionSetsClosure : public HeapRegionClosure { | |
| 5960 private: | |
| 5961 bool _free_list_only; | |
| 5962 OldRegionSet* _old_set; | |
| 5963 FreeRegionList* _free_list; | |
| 5964 size_t _total_used; | |
| 5965 | |
| 5966 public: | |
| 5967 RebuildRegionSetsClosure(bool free_list_only, | |
| 5968 OldRegionSet* old_set, FreeRegionList* free_list) : | |
| 5969 _free_list_only(free_list_only), | |
| 5970 _old_set(old_set), _free_list(free_list), _total_used(0) { | |
| 5971 assert(_free_list->is_empty(), "pre-condition"); | |
| 5972 if (!free_list_only) { | |
| 5973 assert(_old_set->is_empty(), "pre-condition"); | |
| 5974 } | |
| 5975 } | |
| 5976 | |
| 5977 bool doHeapRegion(HeapRegion* r) { | |
| 5978 if (r->continuesHumongous()) { | |
| 5979 return false; | |
| 5980 } | |
| 5981 | |
| 5982 if (r->is_empty()) { | |
| 5983 // Add free regions to the free list | |
| 5984 _free_list->add_as_tail(r); | |
| 5985 } else if (!_free_list_only) { | |
| 5986 assert(!r->is_young(), "we should not come across young regions"); | |
| 5987 | |
| 5988 if (r->isHumongous()) { | |
| 5989 // We ignore humongous regions, we left the humongous set unchanged | |
| 5990 } else { | |
| 5991 // The rest should be old, add them to the old set | |
| 5992 _old_set->add(r); | |
| 5993 } | |
| 5994 _total_used += r->used(); | |
| 5995 } | |
| 5996 | |
| 5997 return false; | |
| 5998 } | |
| 5999 | |
| 6000 size_t total_used() { | |
| 6001 return _total_used; | |
| 6002 } | |
| 6003 }; | |
| 6004 | |
| 6005 void G1CollectedHeap::rebuild_region_sets(bool free_list_only) { | |
| 6006 assert_at_safepoint(true /* should_be_vm_thread */); | |
| 6007 | |
| 6008 RebuildRegionSetsClosure cl(free_list_only, &_old_set, &_free_list); | |
| 6009 heap_region_iterate(&cl); | |
| 6010 | |
| 6011 if (!free_list_only) { | |
| 6012 _summary_bytes_used = cl.total_used(); | |
| 6013 } | |
| 6014 assert(_summary_bytes_used == recalculate_used(), | |
| 6015 err_msg("inconsistent _summary_bytes_used, " | |
| 6016 "value: "SIZE_FORMAT" recalculated: "SIZE_FORMAT, | |
| 6017 _summary_bytes_used, recalculate_used())); | |
| 342 | 6018 } |
| 6019 | |
| 6020 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
| 6021 _refine_cte_cl->set_concurrent(concurrent); | |
| 6022 } | |
| 6023 | |
| 6024 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
| 6025 HeapRegion* hr = heap_region_containing(p); | |
| 6026 if (hr == NULL) { | |
| 6027 return is_in_permanent(p); | |
| 6028 } else { | |
| 6029 return hr->is_in(p); | |
| 6030 } | |
| 6031 } | |
| 2152 | 6032 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6033 // Methods for the mutator alloc region |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6034 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6035 HeapRegion* G1CollectedHeap::new_mutator_alloc_region(size_t word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6036 bool force) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6037 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
|
6038 assert(!force || g1_policy()->can_expand_young_list(), |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6039 "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
|
6040 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
|
6041 if (force || !young_list_full) { |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6042 HeapRegion* new_alloc_region = new_region(word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6043 false /* do_expand */); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6044 if (new_alloc_region != NULL) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6045 set_region_short_lived_locked(new_alloc_region); |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
6046 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Eden, young_list_full); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6047 return new_alloc_region; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6048 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6049 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6050 return NULL; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6051 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6052 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6053 void G1CollectedHeap::retire_mutator_alloc_region(HeapRegion* alloc_region, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6054 size_t allocated_bytes) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6055 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
|
6056 assert(alloc_region->is_young(), "all mutator alloc regions should be young"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6057 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6058 g1_policy()->add_region_to_incremental_cset_lhs(alloc_region); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6059 _summary_bytes_used += allocated_bytes; |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
6060 _hr_printer.retire(alloc_region); |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
6061 // 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
|
6062 // 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
|
6063 // used space has been recored in _summary_bytes_used. |
|
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
6064 g1mm()->update_eden_size(); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6065 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6066 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6067 HeapRegion* MutatorAllocRegion::allocate_new_region(size_t word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6068 bool force) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6069 return _g1h->new_mutator_alloc_region(word_size, force); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6070 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6071 |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6072 void G1CollectedHeap::set_par_threads() { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6073 // 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
|
6074 // in the workgroup. |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6075 int n_workers = workers()->active_workers(); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6076 assert(UseDynamicNumberOfGCThreads || |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6077 n_workers == workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6078 "Otherwise should be using the total number of workers"); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6079 if (n_workers == 0) { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6080 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
|
6081 n_workers = ParallelGCThreads; |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6082 workers()->set_active_workers(n_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6083 } |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6084 set_par_threads(n_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6085 } |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6086 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6087 void MutatorAllocRegion::retire_region(HeapRegion* alloc_region, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6088 size_t allocated_bytes) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6089 _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
|
6090 } |
|
abdfc822206f
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6091 |
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6092 // Methods for the GC alloc regions |
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6093 |
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6094 HeapRegion* G1CollectedHeap::new_gc_alloc_region(size_t word_size, |
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6095 size_t count, |
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6096 GCAllocPurpose ap) { |
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6097 assert(FreeList_lock->owned_by_self(), "pre-condition"); |
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6098 |
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6099 if (count < g1_policy()->max_regions(ap)) { |
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6100 HeapRegion* new_alloc_region = new_region(word_size, |
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6101 true /* do_expand */); |
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6102 if (new_alloc_region != NULL) { |
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6103 // We really only need to do this for old regions given that we |
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6104 // should never scan survivors. But it doesn't hurt to do it |
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6105 // for survivors too. |
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6106 new_alloc_region->set_saved_mark(); |
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6107 if (ap == GCAllocForSurvived) { |
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6108 new_alloc_region->set_survivor(); |
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6109 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Survivor); |
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6110 } else { |
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6111 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Old); |
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6112 } |
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6113 return new_alloc_region; |
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6114 } else { |
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6115 g1_policy()->note_alloc_region_limit_reached(ap); |
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6116 } |
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6117 } |
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6118 return NULL; |
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6119 } |
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6120 |
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6121 void G1CollectedHeap::retire_gc_alloc_region(HeapRegion* alloc_region, |
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6122 size_t allocated_bytes, |
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6123 GCAllocPurpose ap) { |
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6124 alloc_region->note_end_of_copying(); |
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6125 g1_policy()->record_bytes_copied_during_gc(allocated_bytes); |
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6126 if (ap == GCAllocForSurvived) { |
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6127 young_list()->add_survivor_region(alloc_region); |
| 4072 | 6128 } else { |
| 6129 _old_set.add(alloc_region); | |
|
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6130 } |
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6131 _hr_printer.retire(alloc_region); |
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6132 } |
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6133 |
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6134 HeapRegion* SurvivorGCAllocRegion::allocate_new_region(size_t word_size, |
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6135 bool force) { |
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6136 assert(!force, "not supported for GC alloc regions"); |
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6137 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForSurvived); |
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6138 } |
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6139 |
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6140 void SurvivorGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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6141 size_t allocated_bytes) { |
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6142 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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6143 GCAllocForSurvived); |
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6144 } |
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6145 |
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6146 HeapRegion* OldGCAllocRegion::allocate_new_region(size_t word_size, |
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6147 bool force) { |
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6148 assert(!force, "not supported for GC alloc regions"); |
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6149 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForTenured); |
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6150 } |
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6151 |
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6152 void OldGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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6153 size_t allocated_bytes) { |
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6154 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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6155 GCAllocForTenured); |
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6156 } |
|
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6157 // Heap region set verification |
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6158 |
| 2152 | 6159 class VerifyRegionListsClosure : public HeapRegionClosure { |
| 6160 private: | |
| 4072 | 6161 FreeRegionList* _free_list; |
| 6162 OldRegionSet* _old_set; | |
| 2152 | 6163 HumongousRegionSet* _humongous_set; |
| 6164 size_t _region_count; | |
| 6165 | |
| 6166 public: | |
| 4072 | 6167 VerifyRegionListsClosure(OldRegionSet* old_set, |
| 6168 HumongousRegionSet* humongous_set, | |
| 2152 | 6169 FreeRegionList* free_list) : |
| 4072 | 6170 _old_set(old_set), _humongous_set(humongous_set), |
| 6171 _free_list(free_list), _region_count(0) { } | |
| 2152 | 6172 |
| 6173 size_t region_count() { return _region_count; } | |
| 6174 | |
| 6175 bool doHeapRegion(HeapRegion* hr) { | |
| 6176 _region_count += 1; | |
| 6177 | |
| 6178 if (hr->continuesHumongous()) { | |
| 6179 return false; | |
| 6180 } | |
| 6181 | |
| 6182 if (hr->is_young()) { | |
| 6183 // TODO | |
| 6184 } else if (hr->startsHumongous()) { | |
| 6185 _humongous_set->verify_next_region(hr); | |
| 6186 } else if (hr->is_empty()) { | |
| 6187 _free_list->verify_next_region(hr); | |
| 4072 | 6188 } else { |
| 6189 _old_set->verify_next_region(hr); | |
| 2152 | 6190 } |
| 6191 return false; | |
| 6192 } | |
| 6193 }; | |
| 6194 | |
| 3766 | 6195 HeapRegion* G1CollectedHeap::new_heap_region(size_t hrs_index, |
| 6196 HeapWord* bottom) { | |
| 6197 HeapWord* end = bottom + HeapRegion::GrainWords; | |
| 6198 MemRegion mr(bottom, end); | |
| 6199 assert(_g1_reserved.contains(mr), "invariant"); | |
| 6200 // This might return NULL if the allocation fails | |
| 6201 return new HeapRegion(hrs_index, _bot_shared, mr, true /* is_zeroed */); | |
| 6202 } | |
| 6203 | |
| 2152 | 6204 void G1CollectedHeap::verify_region_sets() { |
| 6205 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); | |
| 6206 | |
| 6207 // First, check the explicit lists. | |
| 6208 _free_list.verify(); | |
| 6209 { | |
| 6210 // Given that a concurrent operation might be adding regions to | |
| 6211 // the secondary free list we have to take the lock before | |
| 6212 // verifying it. | |
| 6213 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 6214 _secondary_free_list.verify(); | |
| 6215 } | |
| 4072 | 6216 _old_set.verify(); |
| 2152 | 6217 _humongous_set.verify(); |
| 6218 | |
| 6219 // If a concurrent region freeing operation is in progress it will | |
| 6220 // be difficult to correctly attributed any free regions we come | |
| 6221 // across to the correct free list given that they might belong to | |
| 6222 // one of several (free_list, secondary_free_list, any local lists, | |
| 6223 // etc.). So, if that's the case we will skip the rest of the | |
| 6224 // verification operation. Alternatively, waiting for the concurrent | |
| 6225 // operation to complete will have a non-trivial effect on the GC's | |
| 6226 // operation (no concurrent operation will last longer than the | |
| 6227 // interval between two calls to verification) and it might hide | |
| 6228 // any issues that we would like to catch during testing. | |
| 6229 if (free_regions_coming()) { | |
| 6230 return; | |
| 6231 } | |
| 6232 | |
| 2361 | 6233 // Make sure we append the secondary_free_list on the free_list so |
| 6234 // that all free regions we will come across can be safely | |
| 6235 // attributed to the free_list. | |
| 6236 append_secondary_free_list_if_not_empty_with_lock(); | |
| 2152 | 6237 |
| 6238 // Finally, make sure that the region accounting in the lists is | |
| 6239 // consistent with what we see in the heap. | |
| 4072 | 6240 _old_set.verify_start(); |
| 2152 | 6241 _humongous_set.verify_start(); |
| 6242 _free_list.verify_start(); | |
| 6243 | |
| 4072 | 6244 VerifyRegionListsClosure cl(&_old_set, &_humongous_set, &_free_list); |
| 2152 | 6245 heap_region_iterate(&cl); |
| 6246 | |
| 4072 | 6247 _old_set.verify_end(); |
| 2152 | 6248 _humongous_set.verify_end(); |
| 6249 _free_list.verify_end(); | |
| 342 | 6250 } |